How to knit reinforcement without a hook

How and with what to properly knit reinforcement for the foundation

The combination of concrete with reinforcement provides any reinforced concrete structure with strength and durability. In order for the finished metal frame to last a long time and withstand serious loads, you need to know how to knit reinforcement.

Using special knitting wire

To quickly and reliably make the strapping, a special baked steel wire of round section with a diameter of 0.8 to 1.2 mm is used to fasten the reinforcing elements. It bends easily, fits tightly to the joint, and stretches well (that is, it does not tear when knitting).

When working with such material, the knitter does not require any special skills. This method is successfully used both for tying the reinforcement of a reinforced concrete monolithic slab and for the reinforcing frame of any foundation.

How to quickly knit reinforcement, what materials, tools and equipment will be required for this.

Application of hooks

To work with wire, you can use: a manual crochet hook (it can be easily purchased at any hardware store), a homemade hook for tying reinforcement, a semi-automatic mechanical hook (more expensive than a regular manual one) or a crochet hook made using a screwdriver.

How to make a hook for tying reinforcement:

Option #1:

We take a thick electrode or a metal rod of a suitable diameter, sharpen one end of it and bend it at the desired angle. We bend the handle from the second end of the rod (if desired, you can wrap it with electrical tape). The hook for tying reinforcement with your own hands is ready.

Option #2:

The material for production is a metal rod, both ends of which are sharpened. On one end of the rod we place a round wooden blank for the handle (with a drilled hole in diameter slightly smaller than the diameter of the rod); We bend the second end of the rod to the required (convenient) angle.

Option #3:

An old screwdriver (or a construction awl) is suitable as a starting material, the metal end of which is sharpened. Then we bend it to the required angle and get a hook for knitting reinforcement with a comfortable handle.

On a note! The photo will help you easily make hooks for tying reinforcement.

Tying reinforcement with a screwdriver significantly speeds up and facilitates the work. We clamp a hook for wire tying reinforcement, made from a thick nail, into the chuck. By adjusting the rotational force of the screwdriver, you can easily achieve the required joint density. How to knit the reinforcement cage: with homemade tools or purchased ones (or both) - decide for yourself.

How to crochet

The methods of tying reinforcement are quite simple and understandable. Scheme of step-by-step knitting of reinforcement:

1. We cut the wire into pieces (we select the size experimentally depending on the diameter of the rods).
2. Fold the prepared piece in half.
3. We bend the double workpiece around the intersection of the reinforcing bars.
4. Insert the hook into the loop and place the loose ends on it.
5. Rotate the hook (usually 3-4 rotational movements are enough) until a tight twist is obtained.

Attention! You can tie the reinforcement using the above technology using any type of hook.

There is another way to crochet reinforcement - overlapping.

1. We cut a piece of wire twice as long as in the first case.
2. Fold the piece in half and in half again.
3. We place the double bend on the top bar.
4. We place two double pieces under the lower bar and lift it up.
5. We insert the hook into the loop and press the two free ends to it.
6. Rotate the hook and crimp the joint. If we use a mechanical hook, then with force we pull the handle towards ourselves. We obtain a tight twist due to the fact that the translational motion is converted into a rotational motion by means of a worm gear.

Using a knitting gun

A gun for tying reinforcement greatly simplifies the work of creating any reinforcing frame.

Convenience and advantages of use:

• a cassette with knitting wire is inserted inside the device;
• it is supplied automatically;
• the knitting gun is powered by a built-in battery;
• correct knitting of reinforcement with minimal use of manual labor;
• An automatic gun for tying reinforcement allows you to make all twists with the same tension.

But such a convenient and useful device has disadvantages:

• impossibility of carrying out work in hard-to-reach places;
• a gun for tying reinforcement is expensive, so its use is economically justified only when carrying out large volumes of work.

Table with approximate prices for the main models available for sale on the construction market:

Reinforcement model Ø (mm) Unit production time (sec) Number of units from one battery charge Estimated price (RUB)

GS308-6512	6,5÷12	0,8	1000	19000÷21000
GS308-1016	10÷16	0,8	1000	22000÷24000
GS24T	6÷24	0,8	1000	26000÷28000
GS34T	8÷34	0,8	1000	28000÷30000
RT308V	4÷19	0,8	1100	31000÷35000
BM400	10÷29	1,0	2000	44000÷46000
BM200	9÷21	0,85	2000	28000÷30000
KW-0039	10÷22	0,8	1200	47000÷54000
RDL40	12÷32	0,9	3000	43000÷45000
RDL20	9÷21	0,9	3000	41000÷43000
PVA-32	6÷18	1,6	450	44000÷45000

Pliers and pliers

For tying, ordinary pliers, pliers (with slightly blunt cutting edges) and special pliers for tying reinforcement (manual or automatic) are often used.

Knitting reinforcement with pliers and pliers according to production technology is no different from fastening reinforcing bars using hooks. The only difference is that there is no need to form a wire loop.

Strapping using electric welding

Advantages:

1. A fairly reliable way to tie reinforcing bars.
2. High speed of work completion.
3. Less labor-intensive process than hand knitting.

Flaws:

1. Under the influence of high temperature during welding, the physicochemical properties of steel change (the crystalline structure of iron is disrupted). At the joints, the bending and tensile strength of the reinforcing bar is significantly reduced. Ultimately, this leads to a decrease in the reliability of the entire reinforcing frame.
2. The use of welding significantly increases the rigidity of the frame made of reinforcing bars. When compacting the solution with vibrators, there is a risk of deformation or destruction of rigid welded joints.
3. The frame metal in the area of ​​welding seams is more susceptible to corrosion, which reduces the durability of the entire reinforced concrete structure.
4. To carry out welding work, special equipment is required.
5. The site where such work is carried out must be connected to the power supply, which is not always possible (especially during suburban construction).
6. Work can only be carried out by a qualified specialist (welder). How firmly and reliably the frame made from steel reinforcement is knitted depends on his experience and qualifications.

Tying with metal staples

The reinforcement can be tied using special metal staples.

Advantages:

• high speed of connection execution;
• no tool is required for tying reinforcement (everything is done by hand);
• the work can be done even by an untrained person;
• equal density of connected compounds.

Flaws:

• the need to purchase a set of special staples for the production of tying reinforcement of a certain diameter;
• limited area of ​​application: only for fastening simple cross connections;
• insufficient fastening strength (mainly suitable for light horizontal structures, for example for reinforcing screeds).

Tying with plastic clamps

Knitting reinforcement using plastic clamps is a simple and convenient method for creating a reinforcement frame.

Pros:

• plastic is not subject to corrosion;
• ease of installation;
• high knitting speed;
• low cost;
• there is no need to use special tools.

Minuses:

• work cannot be carried out at subzero temperatures (plastic becomes brittle);
• the strength of the connections is questioned by many professionals;
• a fairly large elongation coefficient of plastic can lead to a decrease in the rigidity of the reinforcing frame (or a violation of the geometry).

Some recommendations for knitting the reinforcement cage of the foundation

The rules on how to knit reinforcement for a strip foundation and for a monolithic slab are the same. The length of a standard reinforcing bar is 6 meters. Very often they have to be joined. The overlap of the reinforcement during tying should be 40÷50 cm, the rods should be tied together evenly in 3-4 places.

The same requirements apply when strengthening corners and junctions with L-shaped and U-shaped additional reinforcing elements.

Knitting a metal frame from reinforcement for a strip foundation can be done not only in the formwork, but also in separate fragments (made in a place convenient for you), which are then lowered into a box.

Important! It is necessary to tie the reinforcement of individual fragments together.

The combination of reinforcement for the foundation and the correct choice of its diameter are the main factors influencing the strength of the foundation of the future structure. When tying reinforcement for the foundation, special attention must be paid to the tightness of all connections.

This video will help you understand how to properly knit foundation reinforcement:

In custody

How to tie reinforcement to a foundation or under a floor screed: using a gun for tying reinforcement or a regular homemade hook, the decision is yours and depends on the amount of work and financial capabilities. The main thing is to follow the rules and technology, then the reinforcing frame will be reliable and durable.

Source: https://zamesbetona.ru/armirovanie/kak-vjazat-armaturu.html

Knitting reinforcement: methods, patterns, norms and rules of knitting for beginners

12.10.2018

Knitting reinforcement is one of the main stages of work to create a reinforcement frame. By connecting the reinforcement, a reinforcing structure is created, thanks to which the concrete receives greater strength in both compression and tension.

If the rods are connected incorrectly, the finished monolithic structure will not receive the design strength.

In order to avoid this, we will look at how to knit reinforcement correctly, observing all the rules and regulations, and what tool can be used to do the work; this will be useful for novice reinforcement makers and for experienced builders.

Methods of knitting reinforcement

Let's consider all the existing ways to connect reinforcement. Each of the options is good in some way, and is used by builders, depending on the type of building and design requirements. There are 3 ways to connect rods; with their help, a strong and reliable metal frame is created:

1. Wire knitting.
2. Welding.
3. Plastic clamps.

These methods of tying reinforcement have their own characteristics. Each of them is correct and is applied depending on the requirements and the material used. When reinforcing a strip foundation for a private house, the reinforcement is often connected by welding rather than tied with wire. But which option is the best?

Advantages and disadvantages of welding connections

Despite the fact that these are different technologies, the right choice can save money and time on construction, without sacrificing structural strength. The method of connecting elements by welding was previously considered one of the most reliable and effective. However, such technology is not always appropriate. Usually it was used when installing bulky frames that strengthen the foundation for multi-story buildings and large cottages.

This method has some disadvantages:

1. You need to have skills in working with a welding machine, otherwise you need to spend money on the services of a professional welder. In this case, the cost increases.
2. Welding points are the weak point of the structure. There the strength of the frame becomes lower.
3. The method is not suitable if you use fiberglass reinforcement. In addition, the A-400 (A-3) fittings, which are the most popular, cannot be connected by welding. Only rods with the index “C” are suitable for work, for example: A500C reinforcement.

Therefore, in modern monolithic construction, welding has been replaced by viscous welding. For private and residential houses, construction of a bathhouse, garage or other buildings, this is the best option for connecting reinforcement.

Pros and cons of joining using the knitting method

Why is this method so good? It has the following positive aspects:

1. Speed ​​of work completion. Knitting with wire takes little time, it is simple and does not require skills. However, if you do it manually, the process slows down. Next we will look at how to quickly knit reinforcement.
2. Ease of troubleshooting. When working with welding, it will be more difficult to eliminate errors; you will have to take a grinder and cut the welding seam. The wire can be simply bitten off with wire cutters or unwound with a crochet hook.
3. You don't need to be a professional to knit reinforcement.
4. The reinforcement process can be performed in formwork.
5. The cost of work is much lower.

An example of knitting a mesh of reinforcement with wire.

If we talk about shortcomings, we note the precariousness of the finished frame. True, this is not a big problem. The structure will be strong, the only problem is that when the frame is moved into the formwork it begins to loosen, in this case it is possible to tack the reinforcement in several places by welding.

To solve this problem with fiberglass reinforcement, you need to attach several braces to make the structure more rigid and stable. By bending, the tension in the knitting areas changes, the frame moves. Therefore, you need to be careful when installing it in the formwork.

It is better to knit the reinforcement in the formwork or above it if the strip foundation is being reinforced.

Features of connecting reinforcement with plastic clamps

The main advantages of this method are that it does not require special skills, it has a high speed of work, and reliable fixation of the reinforcement.
The disadvantages of this method are the following:

1. Price. For large volumes, the wire will be more economical.
2. Speed ​​of work (when compared with other methods of knitting).
3. Correction. You made a mistake somewhere, you will have to bite off the clamp, it becomes unusable, but the wire can be tied up.
4. Reliability. It is not advisable to move around a structure connected with plastic clamps.
5. Temperature. They burst at subzero temperatures.

Based on these data, we can say that this method is more suitable for private construction, with small volumes, and it is also suitable for people who want to do the reinforcement themselves with their own hands.

Tools for tying reinforcement, technology for working with them

Nobody does the work manually. It's practically impossible. There are special tools for this purpose that speed up and simplify the process. Each tool has its own characteristics of use. The following devices are available for tying reinforcement:

1. Hand hook.
2. Knitting gun.
3. Screwdriver.
4. Ticks.

Each of the tools has its own pros and cons, we will consider them, as well as the technology for their use, and based on these data and the opinion of an expert (a reinforcement specialist with 10 years of experience), we will summarize and choose the best option for tying reinforcement.

How to crochet reinforcement correctly?

The peculiarity of the work is that it is done manually. At first, the process will be lengthy, as you need to get better at it. The hook is made of steel, and the handle is made of wood or plastic. The cost of such a hook is 1 thousand rubles.

There are even automatic hooks on sale, but reviews about them are mixed. Some note the short lifespan, others say that it is difficult to twist wire 2 mm or more thick.

There are several options for connecting knots when crocheting reinforcement. Let's look at the most popular ones.

Simple crochet rebar tie knot

The most common and simplest knot is performed as follows:

1. To connect the rods to each other, you need to take a wire 15–20 cm long and bend it in half.
2. The bent wire is bent again, but not completely, you should get a hook.
3. We insert the wire under the reinforcement that needs to be tied.
4. Next comes the hook itself. You need to insert it into the resulting loop and hook the free end of the wire.
5. One revolution is made. It is important to hold the free end.
6. Pulling the hook towards you, twist the wire until it comes off.

Step-by-step diagram for making a simple crocheted reinforcement knot.

Note! In order not to buy a crochet hook, you can make it yourself. You will need a piece of steel rod, and the handle can be made of plastic or wood. Having done it once, you can constantly use the knitting tool. See step-by-step instructions for making a hook with your own hands here.

"Dead Knot"

This unit is used for reinforcing structures consisting of reinforcement bars and clamps, such as beams and columns. Since it reliably fixes the reinforcement into the corner of the clamp, reinforcement specialists called it a “dead” knot. To quickly and efficiently perform such a knot, you need to practice a lot. Consider the instructions for executing the node:

1. We take a wire 20–40 cm long, its size depends on the diameter of the reinforcement used, and bend it in half.
2. We run the wire, loop forward, under the bottom of the reinforcement to the left of the clamp, leaving 2–4 cm to complete the knot.
3. We bring the wire to the top of the clamp and bend it again under the bottom of the reinforcement.
4. Insert the hook into the loop and hook the free end of the wire.
5. We pull the hook towards ourselves and at the same time make several turns until we feel that the wire is clamped, or until the loop comes off.

Scheme of tying reinforcement with a “dead” knot using a hook.

It should be noted! In order for this knot to reliably fix the reinforcement into the corner of the clamp, the wire should be pressed as tightly as possible to the reinforcement and the corner of the clamp, otherwise the tie will turn out to be unreliable.

You can check the quality of the assembly by tugging the clamp with your hand; if it wobbles, it is done incorrectly or is not fully tightened. We tighten it or make an additional tie with a simple knot.

When performing reinforcement of complex structures, for example, semicircular beams, nodes can be combined. First, a “dead” knot is made, and then two simple crosswise ones, as in the photo below.

Special gun for mating

This is an ideal tool for tying reinforcement. It makes the process much faster and easier. It is most convenient to assemble a metal frame with it. The only caveat is that such a unit is not cheap. That's why it is used on large-scale construction projects. The minimum cost is 30 thousand rubles.

It looks like a regular drill. Only a roll of wire is inserted into it. To tie, you need to point the gun at the joint and pull the trigger. He will do the knitting himself in a matter of seconds. This is the simplest and most affordable option for tying reinforcement.

On a note! It takes 9 seconds to make 1 knot tied with a hook. If you take an automated hook, it will take 7 seconds. And tying with a gun takes only 1 second per 1 knot.

But this method also has its disadvantages:

1. Not everywhere they can get to perform mating.
2. Price.
3. When you fix the reinforcement, you can no longer untie the knot with a crochet hook.
4. You cannot knit large-diameter reinforcement.

Using a screwdriver with a hook

To speed up the process and make it automated, a modernized screwdriver is used. It is enough to insert a homemade hook into it. A slate nail is suitable for this purpose. It is clamped into the screwdriver and is ready to go.

The principle of its operation is no different from the previous version. The only difference is that the process is significantly accelerated. And if the screwdriver has a speed adjustment, then it is adjusted so that when the wire is stretched to maximum, it does not break.

Tying reinforcement with pliers

This method of knitting is good because it saves wire during the work, due to the fact that you can knit into one, and you don’t have to make loops, as for a crochet hook.

Of the minuses it should be noted:

1. Requires more practice for speed knitting.
2. The knitting speed is 2 times less than that of a hook.
3. When knitting with 2 wires, the result is a rigid knot with a sharp end; you must wear special shoes, otherwise you can pierce your leg.

Source: https://VseoArmature.ru/armirovanie/vyazka-armatury

Hook for tying reinforcement

The vast majority of modern load-bearing structures are built from reinforced concrete. This material is almost ideal for such tasks, because it combines high strength, durability, resistance to external physical and atmospheric influences, etc.

Simple and screw hook for rebar

To create a monolithic reinforced concrete structure, concrete mortar must be poured into the formwork with a reinforcing cage. The main element in it is the reinforcement frame. Reinforcing cages are produced by connecting individual rods into a single structure, and during their fastening, reinforcement hooks are used. Let's talk about them now.

Purpose and features of the process

First, let's define what a hook does for tying reinforcement, and what task it faces.

As we noted above, a hook is used to knit rods together.

Knitting reinforcement means connecting individual elements together with a special knitting wire. The wire is made of hardened steel, can withstand enormous tensile loads and has a diameter of 1-2 mm.

The joints are tied with wire, assembling the frame as in a construction set. When knitting, our task is to form a working structure from individual rods, and make sure that it is strong enough to withstand the pressure of, for example, several tons of monolithic concrete.

After hardening, the frame is integrated into the concrete, forming the reinforced concrete we all know. But until that moment, these are two different designs .

Knitting reinforcement means doing a huge number of similar actions, consisting of tying rods in several dozen places with wire.

Knitting reinforcement

For example, if you need to make a frame for a column 2 meters high and with a cross-section of 30x30 cm, then for this you will need to purchase about 10-15 rods and assemble them together into a frame of similar sizes. The number of knots tied with wire in this case tends to several hundred.

Obviously, such work cannot be done with your own hands without tools. Not only will you get tired quickly, but the wire is also quite sharp, which can lead to minor injuries.

Tasks like these are the hooks that help us accomplish them.
They allow you to knit wire for reinforcement units quickly and efficiently, speeding up the work process, without exaggeration, several times. Production and speed increases, the quality of components increases, therefore, the quality of the entire structure improves, which is extremely important for load-bearing foundations. to menu

Design

What does a hook for tying reinforcement consist of? Its design is very simple. It’s so simple that you can even make it yourself, and the production of models without additional functionality is on stream.

This, however, does not apply to advanced samples. The same automatic hook gun is a real professional tool, high-tech and expensive.

Let's look at a simple hook that you can make with your own hands if you wish. It consists of:

The handle is made of plastic or wood. Here it is not much different from the handle of a screwdriver, except that the shape is slightly different, since the hook is adapted for actions with a different rotational amplitude.

Hand hook for rebar

The rod has a diameter from 2 to 4 mm. It is made from the same metal as screwdrivers. The base of the rod is inclined from the central axis by 15-30 degrees. Its outermost part is crocheted even more tightly, its inclination is already approximately 60-70 degrees.

Source: https://armaturniy.ru/arm/vyazka/kruchok.html

How to knit reinforcement for beginners: methods, norms and rules, frame for the foundation

There are only two ways to attach reinforcement to a frame: electric welding and knitting. We will not open a debate about which one is preferable. Let’s just say that knitting does not reduce the strength of the working rods.

Any welding weakens the metal because it creates local stresses in it. This negatively affects the reliability of the entire structure.

Compared to welding, knitting work is more labor-intensive.

Despite this, in private construction with its small volumes it is better to choose them. Especially when it comes to such critical structures as foundations and floor slabs.

articles:

In this article we will tell novice builders how to knit reinforcement correctly. Let's look at the tools, materials and technologies used for this work. We hope that the information received will help you confidently handle metal, assembling strong and reliable frames.

Crochet technology

There is nothing complicated in this operation. After doing it several times, you will quickly get used to it.

The essence of the method is as follows: the intersection of the rods is covered with steel wire folded in half. The crochet hook is inserted into the loop and the other free end is grabbed with it. After this, the tool is rotated until it is tightened. The ends of the wire are bent inside the frame.

The craftsmen know one little secret that guarantees tight contact: after not tightening the loop a little, you need to pull it towards yourself and only then tighten it to the end.

Scheme for knitting reinforcement using a hook

Working with a screwdriver is not fundamentally different from crocheting. The advantage is higher speed and less labor intensity. When using a screwdriver, do not forget to set the rotation speed of its chuck to minimum.

You should not knit reinforcement with an electric drill. The large inertia of this tool does not allow you to accurately determine the moment of completion of tightening.

Methods for connecting steel rods and the main types of nodes are shown in the diagram below.

Materials

To assemble the frame, special annealed wire is used. It is durable, but at the same time quite soft. This allows you to tighten the knots without the risk of tearing it. The recommended diameter of this material depends on the cross-section of the reinforcing bars and ranges from 1.0 to 1.4 mm.

Cheap wire comes without coating and is called black. It is more resistant to corrosion and has a protective layer of zinc.

Knitting wire is produced in two versions: in coils and measured (in segments). Working with a skein is more difficult because it has to be cut into pieces by hand. The measuring material can be used immediately. Wire with loops at the ends is especially convenient.

Norms and rules for performing work

Guidelines for the design and manufacture of reinforcement cages are contained in two regulatory documents. GOST 10922-2012 specifies technical conditions for knitted and welded connections of reinforced concrete structures. The set of rules SP 52-101-2003 regulates the requirements for the design of frames.

Based on these standards, standard patterns for tying reinforcement under a strip foundation, dimensions of overlaps, diameters of the reinforcement used and other rules for the execution of work have been developed.

When joining rods on straight and corner sections, the length of the overlaps is important. SNiP sets this parameter depending on the diameter of the working fittings (in millimeters):

• 300 mm for rods with a diameter of 10 mm;
• 380 for 12 mm;
• 480 for 16 mm;
• 580 for 18 mm;
• 680 for 22 mm;
• 760 for 25 mm.

Knitting the strip foundation frame

The estimated number of longitudinal rods (diameter 12-18 mm) are placed at the bottom of the trench on supports (bosses) 4-5 cm thick. The distance between them depends on the size of the foundation and can range from 5 to 20 cm. If the standard length of one steel rod (6 meters) is not enough for the entire “ribbon,” then several rods are used. They are connected to each other, observing the regulatory overlap.

Supports for reinforcement cage

Clamps made of smooth or corrugated steel with a diameter of 8-10 mm are attached vertically to the working rods. According to building codes, the pitch of the clamps must be at least 3/8 of the height of the foundation (20-50 cm).

Having installed the clamps, the upper chord of the working reinforcement is attached to them with wire, observing the design distance between the rods.

At corners and junctions, clamps are placed more often (1/2 step), and the working reinforcement is bent, connecting to the rods of the intersecting section of the “ribbon”.

The length of the bend must be at least 50 diameters of the working reinforcement.

Making a reinforcement cage in a trench is labor-intensive and inconvenient work. That's why experienced builders use this simple device.

Having laid the longitudinal whips on wooden stands, clamps and the lower belt of the working rods are tied to them. The finished structure is transferred and placed in a trench.

Assembly of the reinforcement frame of a monolithic slab is simpler than that of a strip foundation. The design here consists of two flat meshes. The lower rods are laid perpendicularly with a given pitch and connected to each other. Then, at the points of their intersections, stands made of steel rods are placed and the upper mesh is screwed to them.

Stand for mounting the upper frame of a monolithic slab

In recent years, fiberglass reinforcement has begun to be used to assemble frames.

You can knit it in several ways:

• annealed steel wire;
• plastic zip ties;
• plastic clips.

Approximate prices

The cost of tying reinforcement, as estimators say, “sits” in the total price of 1m3 of reinforced concrete. In square or linear meters it is calculated individually for each type of structure. In this case, it is necessary to take into account various parameters (the width and height of the grillage, the thickness of the slab, the cross-section of the reinforcement, the level of complexity of the frame, etc.).

For approximate calculations, builders use prices in rubles per 1 ton of metal used. Today in 2017 it averages from 20 thousand rubles.

Source: https://greensector.ru/stroitelstvo-i-remont/kak-vyazat-armaturu-dlya-nachinayushhikh-sposoby-normy-i-pravila-karkas-pod-fundament.html

How to crochet reinforcement and other methods?

When performing work on pouring concrete foundations, builders are faced with the need to prepare a metal frame to ensure the strength of the structure. You can form a mesh from reinforcing bars in various ways:

• tying frame elements using wire with a hook, a screwdriver or a knitting gun;
• welding reinforcement together;
• securing the rods together using plastic clamps.

There is no single correct option. In practice, all methods are used, and the choice depends on the material used and the conditions at the construction site.

To understand in which case it is better to use one or another method, you should consider the positive and negative features of each.

Crochet

Crocheting reinforcement (you can read about how to do it here) has the following advantages:

• high speed of operation. With some skill, the specialist quickly tightens the knots with a hand tool at the junction of the rods. Such work is not difficult even for beginners;
• ease of repairing defects. Incorrectly applied wire can be easily untwisted or torn with wire cutters. The welding seam cannot be redone so easily - you will have to saw the joint with an angle grinder;
• You don’t need to have much experience to tie reinforcement. A novice builder quickly learns this simple procedure and after fifty knots can be considered a professional;
• You can tie the rods into a frame immediately inside the formwork;
• Labor and material costs are not high.

The disadvantages of crocheting reinforcement include the unsteadiness of the assembled frame. This problem arises when it is necessary to transfer the frame from the assembly site to the formwork. Dealing with this shortcoming is simple:

• in the case of conventional metal reinforcement, it is recommended to strengthen the connections by welding in several places;
• when using fiberglass products, install several braces around the perimeter. They will help give additional strength to the mesh.

In practice, this problem is solved simply - they knit the frame directly in the formwork so that it does not have to be moved.

In addition to a manual hook for tying reinforcement, a semi-automatic hook is also used. This device helps you get the job done much faster. A semi-automatic machine is a mechanism equipped with a reversible screw base. If the handle is pulled back, the screw begins to rotate, pulling the wire onto the joint.

You can see how to use a semi-automatic crochet hook for tying reinforcement cages in the video below. You have to get used to using such a tool, but professional workers manage to tighten the knot on the connection in one movement, which noticeably speeds up the whole process.

Welding

The technology of welding reinforcement is used in the construction of monolithic foundations for multi-story buildings. Previously, this method was considered the most reliable, but in modern conditions other methods of connecting rods are more often used.

The disadvantages of the welded method include:

• the need to involve a professional welder in the work. Paying a specialist automatically increases the estimated cost of the facility;
• the point of connection of two reinforcing bars weakens the overall strength of the structure and is a weak point;
• It is impossible to connect fiberglass reinforcement by welding;
• the most popular brand of rods for frame assembly (A-400) is not suitable for this method. You will have to order A500C brand rods separately.

Source: https://DomZastroika.ru/foundation/kak-vyazat-armaturu-dlya-fundamenta-kryuchkom.html

How to make a hook for tying reinforcement with your own hands?

The connection of metal reinforcing bars into a frame for concrete structures in private housing construction occurs using the knitting method. To assemble the reinforcing frame, a special device in the form of a small hook is used. Let's look further at how to make a hook for tying reinforcement with your own hands and how to work with it correctly.

Types of tools for knitting reinforcement

The knitting method involves using steel wire to manually fix rods perpendicular to each other in places where they intersect crosswise.

A crochet hook is a simple and safe tool that allows you to tie reinforcement bars quickly, securely and evenly.

Today, there are three types of ready-made hooks for knitting reinforcement bars, which can be purchased in the store. In addition, you can make a hook for the reinforcement yourself.

Manual

Photo of a purchased hook. The handle rotates freely.

A simple hook is a rod attached to a handle with bends that grip the wire. The hook for tying the reinforcement is rotated manually. The advantage of hand tools is their availability, durability and ease of use.

A hand crochet hook is an excellent option for novice builders, which will allow you to understand the knitting algorithm and feel the optimal degree of wire tension to obtain high-quality knots.

Screw

The knitting wire is selected with a diameter from 0.8 to 2 mm.

A semi-automatic hook is a reversible tool that operates by forward movements of the handle. The device has a rod with a hook in the form of a drill, which fits into the funnel of the handle along the thread, tightening the wire.

The cost of such a tool is higher than a manual one. But the screw tool makes it possible to cope with a wide range of work in a short time - in order to completely tighten the knot, it is enough to make only a couple of movements.

Mechanical

Builders who value every second choose an automatic hook (gun) for tying reinforcement. The operating principle of the gun is based on fully automatic rotation of the hook. This device is the most modern and advanced, allowing you to achieve maximum results and speed without large labor costs on the part of the builder.

Operating principle.

Buying such a hook for household purposes will not be justified: working with a gun requires a fairly large consumption of wire, and the cost of the device is high. But on large projects or when performing work that needs to be completed in an extremely short time, this option is ideal!

Homemade

Source: https://FundamentClub.ru/montazh/kryuchok-dlya-vyazki-armatury.html

How to knit reinforcement correctly - ProBuildingmaterials

Construction of a house begins with laying the foundation. The main requirement for a concrete foundation is its strength. It is achieved by laying a frame of reinforcement bars tied together inside the concrete. Such a frame is called reinforcing. This article will discuss such an important stage of construction work as tying reinforcement for the foundation.

Methods

It is necessary to first consider what methods of tying reinforcement for the foundation generally exist. They differ from each other by type:

• tool;
• material;
• knitting patterns;
• type of fittings.

By type of tool - this can be either knitting reinforcement for the foundation manually or using a special tool. For the latter, special crochet hooks, screwdrivers, and special pistols , produced specifically for this operation.

The material used to connect reinforcement bars to each other is:

• tying wire is the most common and reliable technology for tying reinforcement for the foundation, because it is performed with tying a knot.
• paper clips - are wire clamps, which, unlike ligation with knitting wire, are made without tying a knot.
• small clamps made of plastic - this new material has become widespread due to its ease of installation and high knitting speed, and besides, it is not afraid of corrosion. However, such a bundle of reinforcement for the foundation causes a certain skepticism among professionals. Read more here.
• clips - made in the form of latches that fix adjacent rods to each other.
• welded connection - this old method has not become widespread, since the welded connection, due to its fragility, is susceptible to cracking during concrete pouring and does not have the necessary reliability. To perform a high-quality welded joint, you need a highly qualified welder.

Required wire

When choosing wire, the following factors must be considered:

• Manufacturing accuracy class. The accuracy class is determined by the production method. There is a wire of a higher accuracy class, its deviation of the actual size, diameter, from that declared by the manufacturer along the entire length of the wire is less than that of a wire of a lower accuracy class. However, for knitting reinforcement, the accuracy class is not particularly important.
• Wire rolling method. There are two types of rolled products: cold-rolled and hot-rolled. Cold-rolled steel is rolled out from blanks by presses without heating. With the hot rolling method, rolled steel is rolled out in a heated state, which gives greater strength.
• Which group in terms of tensile strength does the wire belong to (there are the first and second groups);
• Degree of corrosion resistance. On this basis, there is only one difference - whether there is a galvanized coating on the wire or not.

The criterion for choosing a wire is very simple, you need a wire that is called “knitting” . It has a full set of necessary characteristics: sufficient softness with the declared strength, abrasion resistance and reliability when fastened.

Galvanized wire is considered overkill.
The optimal diameter of the knitting wire is 1.2-1.4 mm. A wire with a diameter of 1.6-2 mm takes a lot of force, as a result of which construction slows down, and the piece is too weak, it will simply burst.

You need to check the rigidity of the connection of the reinforcement by touching the rods - if they are rigidly fixed, they will not move, which means everything is in order. You should not test the strength of the knot itself, otherwise there is a risk of loosening the binding.

The length of wire recommended for one knitting point is from 30 to 50 cm. The wire itself is extremely cheap - about 50 rubles. for 100 meters. To avoid running out of it at the wrong time due to loss or excessive consumption, it is recommended to buy it with a double supply. 100 rubles for 200 meters is quite inexpensive.

How to bend reinforcement correctly, all the ways

You should choose how to bend the reinforcement for the foundation based on its diameter: with your own hands is quite easy, but for thicker reinforcement you will have to use special devices, homemade or specialized.

Among homemade devices, two methods are common. The first is when an ordinary pipe of suitable diameter is installed vertically and its base is poured with concrete so that it stands firmly.

The fittings are inserted inside all the way, and now the end protruding from the pipe can be bent by simply leaning on it. If this presents certain difficulties, then a second pipe is additionally put on the free end of the reinforcement, and now, due to the increased leverage, the thick reinforcement can be easily bent.

Welding is also often used. By softening a section of the rod with heat, it becomes easy to bend. The same is done with a blowtorch and a hammer. After heating the bend point with a lamp, bend the reinforcement with a hammer.

The most radical way is to make a cut with a small grinder and then bend it completely using available tools.

Crochet

The design of the hook for these purposes may be different, but this is not so important. The meaning lies in the presence of a hook as such, because it is used to thread the wire. The rules for tying reinforcement for the foundation are shown schematically in the figure.

Pay attention to the sequence of actions:

1. Bend the wire in half;
2. Follow the arrow, as in the figure, bring it into position for threading;
3. Insert the hook into the loop that will now be wound;
4. Place the hook loop inward between the free ends of the wire;
5. Without removing the hook, twist until tightened, but do not pinch;
6. Ready!

For strip foundation

The strip foundation reinforcement has two patterns for laying rods:

• system of 4 rods : two at the base of the foundation, two at the top (used if the width of the foundation does not exceed 50 cm),
• system of 6 rods : an additional longitudinal rod is placed between the two main ones (used in cases where the foundation width is more than 50 cm).

Bent reinforcement is laid at the corners, and the ends should protrude from the corner by at least 40 cm. The reinforcement connection nodes should be located from each other at a distance of no more than 60 bar diameters .
For example, if 12 mm reinforcement is used, then the strapping should be every 72 cm or more often. How to choose reinforcement for a strip foundation?

For columnar

This is a foundation that is placed on pillars that act as piles.
Bound reinforcement for the foundation is placed inside the pillars before pouring. The tying of reinforcement for a columnar foundation is the same as for a strip foundation - either 4 rods, or 6 for large columnar foundations.

For vertical rods in this type of foundation, 12 mm reinforcement is used, since this is a vertical foundation. The cross rods can be thinner and smoother.

For wooden houses, it is allowed to use longitudinal and vertical reinforcement thinner than 12 mm. Sometimes, for the foundation of small wooden buildings, a welded frame is constructed from vertical rods connected with hoops like a barrel. This is incorrect, because with this bonding method you can only use welding, and this is not a completely reliable method. We have already talked about this above.

For slab

A reinforcement frame for a foundation can take the form of a two-dimensional plane, a mesh formed from reinforcement bars. The second option is volumetric, in the form of two meshes of intersecting reinforcement, located one above the other and connected by transverse rods.

Reinforcement - from 12 mm and above, up to 16 in private housing construction. The mesh cell size is 200x200 mm. The distance from the lower reinforcement belt to the pillow (or insulation) is 50 mm. The top belt is also protected from external influences by a 50 mm layer of concrete.

Cost calculation (price for work and materials)

Let's take as an example a strip foundation 10 by 10 meters. This is the perimeter of the house. In addition, there will be a foundation for internal load-bearing walls - two walls of 10 meters each. It turns out 60 m.p. foundation.

How much reinforcement and tying wire will be required with the right approach?
Let's say the foundation is less than 50 cm wide - it will use a scheme with four longitudinal rods. In this case, in 1 linear meter of the foundation the following will be used:

• 4 longitudinal rods. That means at 60 mp. will be 240 meters.
• 4 vertical. With a foundation height of, say, 50 cm, their height will be no more than 45 cm. 4 x 45 cm = 1.8 m. In 60 meters of the foundation - 108 m.
• 4 transverse. With a foundation width of 45 cm, the width of the transverse ones will not exceed 35 cm. 4 x 35 cm = 1.40 m. In 60 meters of the foundation - 84 m.

How much is it?

For longitudinal rods we use 12 mm reinforcement costing 25-30 r/m.p.
240 x 35(30) =6000 (7200) For vertical and transverse rods, take 6-8 mm costing 12-16 r/m.p. (108+84) x 12(16)=2304 (3072)

So, the purchase of reinforcing rods for this foundation will cost from 8304 to 10072 rubles.

Now let's calculate the required amount of wire. 4 ties for a 4-bar foundation per 1 m.p. This, based on a maximum consumption of 50 cm per tie, is 2 meters of wire per meter of structure.

We have 60 meters, so we need 120 meters of wire. 1 m of wire with a diameter of 1.2 mm weighs 9 grams, respectively, 120 m of wire with a diameter of 1.2 mm weighs about 1 kg, which costs about 50 rubles.

The wire is cheap, so you can and should buy it with a double supply - 240 meters for 100 rubles.

All that remains is to calculate the cost of installation and tying of the frame. As a rule, it is not calculated separately and is included in the total cost of pouring the foundation. In the regions, such work is cheaper, but the price range is approximately the same - 1000-2000 rubles per cubic meter. This price includes the construction of a trench, installation of formwork, binding of the frame, pouring concrete and removing the formwork.

The total length of the foundation we are calculating is 60 meters, width 0.4 m, height 0.5 m. Let's calculate the volume: 60 x 0.4 x 0.5 = 12 m3. With this volume, the cost of foundation work will be 12,000 - 24,000 rubles.

Source: https://isss.ru/raznoe/kak-pravilno-vyazat-armaturu.html

Hook for tying reinforcement

Construction activities are inextricably linked with the implementation of reinforcement works. Foundations and floors reinforced with reinforcement frames ensure reliability and long service life of buildings.

Reinforced concrete has an increased strength margin, is able to withstand significant loads and maintains its integrity for decades. To make a reliable spatial frame, a reinforcement hook is an indispensable tool.

It’s easy to make a hook for tying reinforcement with your own hands or use a purchased device.

For a small amount of concreting work, steel rods are laid in a formwork frame, which is filled with concrete mixture. However, when strengthening large foundation structures, a spatial frame is constructed from steel rods. The rods are evenly distributed throughout the entire space to be poured. This allows reinforced concrete to evenly absorb loads and increases the strength of building structures.

Tying reinforcement for the foundation using welding

The connection of individual elements of a reinforcing metal structure can be done in various ways:

• using electric welding. Despite the increased speed of fixation of parts of the reinforcing lattice, overheating of the material occurs in the connection zone, which disrupts its crystalline structure and can cause the formation of cracks under the influence of load. Welded areas are also more susceptible to corrosion processes, which negatively affect the strength and durability of the metal structure;
• using special clamps made of elastic plastic. They can significantly reduce the duration of knitting activities, but have a serious drawback. Plastic loses its strength properties in the cold season. This is the reason for the weakening of individual sections of the joint and the rupture of clamps when moving along the reinforcing grid;
• using hooks for tying reinforcement. This is a fairly simple fixation method with an increased degree of reliability. To complete the work, you need to cut the wire in the required quantity. To assemble the lattice, a special knitting wire is used, which is used to tighten the rods at the intersection areas. To simplify fixation, a hook for reinforcement is used - a knitting tool with a simple principle of operation.

Professional builders use various knitting devices when carrying out reinforcement measures. This is the optimal solution. For small frames, they use a self-made hook for knitting reinforcement, and for increased knitting volumes, they use special guns.

Crochet hooks for reinforcement - types of tools

Various types of devices are used to bind steel blanks of a spatial frame:

• manual. Requires significant effort to ensure fixation. It is easy to make such a device yourself, spending a minimum of money;
• semi-automatic. Using industrially manufactured screw devices, you can facilitate the tying operation and speed up the process of assembling the load-bearing frame;

Crochet hooks for reinforcement

• automatic. The use of a professional gun allows you to speed up the process of joining metal rods when performing fixation on an industrial scale.

Let us dwell in detail on the features of each type of knitting tool.

Various types of hand tools are used:

• a tool made independently from an electrode or steel wire;
• ready-made devices purchased in construction stores.

To perform fixation, you must first cut the wire into pieces of the required size. Depending on the skill of the knitter, within a minute you can fix from 5 to 15 sections of the connection.

Advantages of hand tools:

• ease of performing binding operations;
• the possibility of making it yourself;
• insignificant level of production or purchase costs.

Hook for tying reinforcement VOREL 49830

Along with the advantages, there are also weaknesses:

• reduced productivity of knitting operations;
• increased level of effort for twisting the wire.

Professional builders often use a self-made or purchased knitting hook for reinforcement, which provides an increased degree of reliability of the connection.

A special device with a reverse operating principle allows you to speed up and automate the twisting process. At first glance, it looks like a standard manual device, but differs in the presence of a screw mechanism consisting of the following parts:

• plastic handle with internal screw thread;
• working body with a screw thread on the rod.

When assembled, these elements form a mechanism with a reciprocating principle of operation. The reversible device works quite simply - moving the handle causes rotation of the working element on which the wire loop is put.

Advantages of the reversible device:

• increased wire binding performance;
• Possibility of use in areas with limited access;

Automatic hook for tying reinforcement

• ease of knitting operations;
• durability of the device with regular lubrication.

The device has the only drawback - its increased price when compared with the cost of a conventional hand tool.

Using a reversible tool, the knitter can perform an increased amount of work without getting tired. The screw device is superior in efficiency to the manual device when it is necessary to manually pull and twist the wire ends. Without reinstalling the working hook, by cyclically moving the handle you can achieve reliable fastening.

Procedure for using the device:

• Insert the hook of the tool into the twisted loop.
• Pull the handle towards you along the working axis.
• Return the handle to the starting position.
• Perform the next movement cycle.

You can also make your own semi-automatic tightening device using a regular screwdriver. You will need a bent nail without a head or an L-shaped rod, the end of which must be inserted into the tool chuck. With a little practice, it is not difficult to master the principles of operation using this device.

Professional hook for fittings - use a gun

A knitting gun is a professional tool that is used on large construction sites. Using an automatic hook for tying pistol-type reinforcement, even a beginner can easily handle the assembly of a large reinforcement cage.

The knitting gun is a professional tool

Advantages of a professional device:

• there is no need to pre-cut the wire into blanks;
• wire is automatically fed from the working drum;
• material savings are achieved due to the absence of wire waste;
• increased pistol performance;
• increased loop tightening force;
• possibility of adjusting the twisting force and wire length.

Among the main advantages, it is necessary to note the possibility of autonomous operation from a battery, as well as the use of a special extension cord, which allows you to perform work while standing, without bending your body. The design of the device allows you to hold it in one hand, while the other hand supports the steel rods without the help of assistants. The duration of tightening the joint does not exceed one second. This is very convenient when performing work on an industrial scale.

Along with the advantages, there are also weaknesses:

• quite high price of a professional pistol;
• increased costs for purchasing special wire;
• inconvenience of use in confined spaces;
• the need to train knitters in how to work with the tool.

It is important to purchase consumables that correspond in cross-sectional size and rigidity to the characteristics of the gun. Otherwise, equipment damage may occur. The gun is used by professionals when assembling the frames of large foundations. And at the same time, in certain places of the grille, fastening can only be done using hand tools.

Knitting gun BM-400

We make a device for tying reinforcement with our own hands

Craftsmen who have been assembling reinforcement frames for a long time prefer homemade tools. This is due to a number of factors:

• If you manufacture it yourself, the device can be equipped with a handle in a form convenient for the hand. This will increase productivity and ensure operating comfort;
• To manufacture the working grip on your own, special grades of steel can be used. Durable material will not bend under loads;
• it is easy to give the working body the required shape and make it, if necessary, in an increased size. This is convenient for working in hard-to-reach areas.

It’s easy to make a regular hook for tying reinforcement with your own hands.

Various options are possible:

• without handle. The simplified design involves the use of a welding electrode;
• with handle. Such a device is not inferior in quality to those manufactured in industrial conditions.

To make a simplified design, you need a welding electrode, a hammer and pliers. Procedure:

• Remove the coating.
• Step back a couple of centimeters from one edge and bend it at a right angle.
• Form a rectangular holder with dimensions of 4x10 cm.
• Sharpen the working part and give it a cone shape.

We knit reinforcement for the ceiling with our own hands

The manufacturing process will take no more than 10 minutes.

The design with a wooden handle is more convenient to use and can be made in a couple of hours . For assembly you will need:

• steel wire with a diameter of 8 mm and a length of 0.4 m;
• wood blank for making a handle;
• washers and nuts corresponding to the diameter of the rod;
• electric welding;
• pliers;
• Bulgarian;
• electric drill;
• a sheet of sandpaper;
• sharp knife.

Assembly algorithm:

• Make a handle.
• Drill a hole in it.
• Sand the surface.
• Weld the nut to the end of the rod.

Do-it-yourself crochet hook from rebar

• Put the washer on and insert it into the handle hole.
• Install the washer and weld the next nut.
• Give the end of the rod the required configuration and sharpen the edge.
• Cover the handle with varnish or soak it with an antiseptic.

After making several connections, check the functionality of the device. If necessary, bend the wire part.

How to crochet reinforcement - fixation technology

For all types of knitting devices, the technology for performing the work is simple. Tying work is carried out on the basis of the drawing after completion of preparatory activities and installation of vertical rods. The proven method of fixation performed with one loop is widely used.

Crochet reinforcement with one loop

Before starting tying work, you should cut the wire with a cross-section of 1.2 mm into pieces of 20–30 cm in the required quantity. Further procedure:

• Wrap the wire folded in 2 layers around the knot, placing it diagonally.
• Insert the hook into the formed loop and hook the other end of the wire with it.

• Insert the ends of the wire captured on the other side into the loop.

Rotate the working tool, controlling the degree of tightening of the connection. All that remains is to remove the working part of the grip from the loop and you can proceed to the next joint.

Conclusion

When planning to assemble a reinforcement frame yourself, you should choose the right knitting tool for the job and study the technology. By doing the work on your own, you can master the skills of doing knitting work and save financial resources.

Source: https://pobetony.expert/tekhnika-i-materialy/kryuchok-dlya-vyazaniya-armatury

How to knit reinforcement - a detailed description of patterns and methods

In construction, reinforcement is the name given to interconnected elements that, when worked together with concrete, create a more advanced material – reinforced concrete. Thanks to reinforcement, beams and slabs better withstand tensile stresses, and compressed structures increase strength. To obtain the desired effect, the reinforcement fragments are connected to each other. Due to the method of connection, the method is called binding.

How to knit reinforcement

Since reinforcement in the form of steel rods is mainly used in the construction of foundations and main walls, their connection to absorb compressive or tensile stresses is mandatory. In mass construction, the welding and tying method is used for connections, in individual construction, usually only tying. In this case, the reinforcement is knitted using:

• knitting wire;
• reinforcement clamps.

The term “knitting wire” means round wire made of low-carbon steel in accordance with GOST 3282-74. It can be regular or heat-treated (marked “O”), coated or uncoated. The thickness of the zinc coating determines the class of the material.

When choosing which wire to knit the reinforcement with, you should pay attention to the grade of concrete and the operating conditions of the structure. In this case, mechanical properties are taken into account.

So, if tying reinforcement for the foundation is supposed to be done manually, it is better to choose a thinner option, since without a special tool, thick wire for tying reinforcement requires significant effort.

In addition to industrially produced low-carbon wire, it is permissible to use metal cord from car tires. When tires are burned, the metal cord is released and simultaneously undergoes heat treatment, which makes it easier to work with in the future. This option of knitting material is acceptable only for small volumes of work and individual low-responsibility construction.

Plastic clamps, regular and with a steel core, are also applicable. They are usually used for fiberglass reinforcement.

The use of clamps is permissible in cases where liquid concrete will not be subjected to mechanical loads during the hardening process (they will not walk on it, stack heavy things, or load it with other building materials).

This option is applicable for low-rise buildings, since during the process of pouring a large mass of concrete mixture, the fastenings can move along with the reinforcement. The displacement disrupts the functioning of the frame and leads to a change in the design strength of the structure.

How to knit reinforcement for a foundation

Depending on the chosen material for knitting, various fixation methods are used. The simplest situation is with plastic clamps. They are wrapped around the joint as far as the length allows and tightened.

To correctly knit reinforcement for a strip foundation, you will need a tool. Depending on the reinforcement tying pattern, the rods are distributed over the future pouring field.

If you plan to create a foundation, some of the rods are stuck into the prepared base (rammed sand and gravel backfill), this makes the work easier. After completing the connecting work, the frame is raised above the ground on special stands. This is necessary to prevent corrosion of metal elements protruding from the concrete. To connect the rods use:

1. special pliers for tying reinforcement; 
2. crochet hook, homemade or industrial production; 
3. a curved hook made of a thick nail or dowel, inserted into the chuck of a drill (screwdriver). Thanks to this mechanized hook, wire twisting is done faster and with less manual force.  
4. semi-automatic hook for tying reinforcement. A mechanism with a leg and a spring return mechanism pulls the wire and makes several rotational movements. This happens thanks to the spiral grooves on the hook leg, which, when pulled back, provide rotation and return to its previous position.  

The use of such tools is advisable for small amounts of work, for example, when building your own house, where tying reinforcement with your own hands is done over a short period of time (when preparing the foundation for a frame or brick structure or installing a fence on a concrete base).

A do-it-yourself hook for tying reinforcement is made from a used electrode, nail or other suitable metal rod of the required strength.

Professional tool for tying reinforcement

When creating a large volume of reinforcement for reinforced concrete structures (professional activities, large private construction), instead of manual or semi-automatic tools, it is better to use an automatic, so-called gun for tying reinforcement. This useful device was invented in Japan; it allows you to tighten the wire at the connection of the rods with the required force in a matter of seconds.

The operating principle of the device is shown in the video.

Source: https://stroy-okey.ru/house/foundation/kak-vjazat-armaturu-podrobnoe-opisanie-shem-i-sposobov/

Do-it-yourself hook for tying reinforcement: How to make it yourself? +

A hook designed for knitting reinforcement is a device for fastening reinforcing bars together. Knitting reinforcement using a hook is a very simple process.

This is the most effective method, since it does not require special skills and knowledge, as is the case with welding. There is also no need to buy expensive equipment. The only device you need is a hook for tying reinforcement.

This simple tool can be purchased at any hardware store, and if you wish, you can learn how to make crochet hooks yourself.

One of the types of execution of a simple hook

A crochet hook significantly reduces the labor intensity of the process of forming a solid object from twigs. Metal frames are used when pouring concrete into walls, foundations, etc. The reinforcement is knitted using soft wire, which is highly flexible and durable.

Methods and schemes for tying reinforcement with wire

There are two ways to fix reinforcing bars: manual and automated.

The manual method uses four types of tools:

• Pliers;
• Hook (simple and reversible);
• Screwdriver with attachment.

Using pliers is not very convenient. Therefore, they are rarely used and only for assembling small frames. Crochet is used more often. This simple device, with some skill, helps to quickly connect steel rods.

There is an improved modification of the simple hook (reversible). Its basis is a screw that rotates when the handle is pulled back.

By combining a hook with a screwdriver, home craftsmen have created another convenient device for fixing steel rods in a frame.

Automated knitting is performed with a so-called pistol. This is a rather complex and expensive device used at large facilities. Its performance is such that tying one knot occurs in 1 second.

The device is equipped with a compartment in which a spool of wire is installed. The working body of the gun delivers it to the fittings and ties it into a knot.

Let's consider the main methods of connecting reinforcement for the foundation. Experienced builders practice four main methods of tying reinforcement to assemble various frames and meshes:

1. welding of fittings;
2. tying reinforcement with wire;
3. overlapping reinforcement connection
4. mechanical connection of reinforcement using steel couplings.

All methods have their pros and cons. When building small houses, the installation of a reinforcement frame using welding or knitting reinforcement using wire is most often used.

Comparing these two methods is not entirely correct, since these are different technologies, but there are still situations when choosing between these methods will help save time and money, without harming the strength of the structure.

Connecting reinforcement by welding is one of the most effective methods, but the use of this type of connection of reinforcement is not always appropriate. Most often it is used for the installation of large frames for multi-story buildings and heavy brick cottages.

Disadvantages of connecting reinforcement using welding:

• professional skills are required or you will have to resort to the services of a welder, which will significantly affect the cost of the structure;
• reduction in the strength of reinforcement products at welding points;
• not possible to use, for example, one of the most popular classes of reinforcement A-400 (A-III) cannot be connected by welding, it will not be possible to weld fiberglass reinforcement;
• the possibility of damage to joints during concrete compaction with vibrators.

Source: https://instanko.ru/elektroinstrument/kryuk-dlya-vyazki-armatury.html