Tying rebar by strip foundation: step by step guide

properly raised base largely determines the durability of the architectural structures. Durability appropriate design, in turn, depends on the parameters of the reinforcement. One of the most important stages is mated fittings under strip foundation. This power frame you can do yourself without any errors after careful acquaintance with technology, tools, consumables. If in the future the project will be entrusted with the construction crew, the following information will help to control the correctness actions of the performers.

Features continuous footing

This kind of base used is often due to the following features and advantages:

• Such contours foundation walls, so Consumption mortar and other materials is less in comparison with monolithic counterparts.
• Even the simplest, not flush embodiment, distributes the load. When erecting small extensions, arbors and other light construction is permissible to use foundation without reinforcement.
• If necessary - set melkozaglublennoe base with slatted frame inside. On soft ground it complement piles.
• Work on the construction of such facilities can carry out its own, Using relatively inexpensive materials.

These engineering solutions allow to provide reliable support at a high level groundwater, The sand and the other is not enough solid bases. piling screwed to a level hard ground, below the frost. Solid concrete elements strengthens the power frame house. On pouring stage they can be installed embedded parts.

Important! In any case requires a preliminary calculation of loads, bearing capacity of foundation. The exact calculation will help to optimize the flow of material and labor resources. If their own experience and knowledge is not enough - ask for help to specialized professionals. The relevant technical data are a mandatory part of a professional project documentation.

If you decide to use a metal armature, it is necessary to pay attention to the following features.

In building constructions using valves according to State Standard 5781-82. For the release of such metal products used hot rolling technology. Precisely regulated: the size, height and location of protrusions steels. To increase resistance to stress, corrosive processes, use different types of doping. Using laboratory techniques verified strength, and other technical parameters.

For the particular construction suitable fixture class "A 400" ( "A-III») with a diameter of 10 mm to 16 mm. In the busiest places can be used bars of 16 mm to 22 mm. If the name is a letter "C" - these products can bind with the use of welded joints. The presence of the "K" indicates the additives improving corrosion resistance. Jumpers and other ancillary elements of the framework are not experiencing heavy loads. They can be made from thin bars with a diameter of 6-10 mm (classes from "A 240" ( "A-I») to "A 300" ( "A-II»).

It should be understood that a better performance and additional features increase the cost of production. However, increased resistance to oxidative processes in this case is not required. After solidification of concrete in the depth there will be no moisture and fresh air. Respectively - are excluded favorable conditions for the development of corrosion.

The ability to create products from them welded structures also need to consider the details. Such working operations instruct to carry out the most qualified to avoid the following troubles:

• At too prolonged exposure to high temperature electric arc can significantly reduce the strength of the metal.
• A hidden weld defect capable cause destruction of compounds in step mortar filling.
• any welded joint without thorough stripping and applying the special protective coating is not resistant to corrosion processes.

possible to create a frame structure of composite reinforcement. These products were introduced relatively recently, so there are no standards, backed up by many years of practical tests. It should also be noted the variety of combinations of glass, carbon and basalt in combination with plastic.

Such reinforcement is less thermal conductivity compared with a metallic counterpart. After pouring concrete it does not create a "thermal bridges", which generally increases the insulating characteristics design. Other "pluses" are listed below:

• Composites, polymer-based corrosion is not threatened. They are stronger than about 3 times that of the metal parts with the same diameter, when applying force to stretch.
• An additional advantage is the low weight. Light bars are not difficult to transport, unload.
• For signs rustSo after the completion of assembly operations remain clean clothes.

However, specialized experts recommend pay attention to these "cons":

• Armature fiberglass has a lower elasticity. It can not be bent with a small radius without compromising the integrity.
• It loses strength when heated.
• Some modifications are capable of supporting the combustion process.
• It can not be connected welds.
• So far there is no technology that is based on accurate calculations and confirmed by extensive experience.

Note! Some disadvantages can be called conventional. Above are considered convenience of wire connections viscous and complexity when creating the weld. Fiberglass does not conduct electrical current, but in the depth of the foundation is not a big deal.

It does not always turn out to clarify the absence of a marriage after a visual inspection. That is why preference is given to well-known manufacturers of products, the parameters of which are confirmed by official certificates. But this statement can be attributed to all kinds of reinforcement products equally.

Scheme reinforcement strip foundation

If there is no professional project approved by the architectural firm, you can use the following information. They will help to make the calculation of reinforcement arbours, bath, small house, Other light structure with foundation belt type. These rules can be applied when using metal products. Selecting composite counterparts, will have to make the appropriate correction of stress.

The following are features of the technology:

• At the highest loads are distributed longitudinal structural elements. Here use rods with a diameter of 10-12 mm.
• For vertical and lateral reinforcement portions fit with a thickness of 6 to 10 mm.
• Some distances between the individual elements shown in Fig. With increasing distance, choosing rods with a larger diameter or decreased corresponding step.
• Essential arrangement of the reinforcement cage inside concrete products. To the outer surface of the support by pouring it away 30-60 mm.

More convenient and faster than manually, you can obtain the necessary data using software. Such "calculators" offer for free some sellers reinforcement products, building sites (ours is no exception).

It is performed with the total weight of the construction, the depth of freezing and the groundwater level, the geological data. Such a task is required to be skilled charge profile, if the object is assumed construction rendering load 40 kN per sq. M. the surface of the land.

A calculator for calculating the required amount of reinforcement for strip foundation

Binding wire for reinforcement

Binding of individual elements in a solid design would not be accompanied by excessive difficulties and costs to determine if the selection criteria of the fastening material.

• A small price per kilogram metal wire for knitting is one of the most important advantages. Therefore, even with large-scale works not require significant financial investments.
• It should be durable to the subsequent concrete casting frame integrity is preserved.
• Sufficient flexibility will facilitate the implementation of the working operations.
• Corrosion protection in this case is not the determining factor.

Find out which wire knit reinforcement recommended by professionals, not difficult. For this we need to study the industry GOST 3282 74. The following are some of the provisions of this standard, which will be useful in practice:

• Wire is manufactured as standard and annealed. After heat treatment it retains its strength and becomes flexible.
• Products are divided into two groups of resistance to tearing. Tests are products that have not undergone heat treatment.
• Also use 2 groups in terms of accuracy (normal and improved). Control-of-roundness, size, power settings.
• Producing products with a surface layer and without additional protection.
• For compounds can acquire specialized reinforcement wire with a diameter of 0,16-10 mm.

Note! When the wire diameter in the range of one to 2.5 mm, the product quality must maintain its integrity under a force of 1 590-1270 N mm.kv.

Checking resistance to stress, the quality of galvanization and some other parameters can only under laboratory conditions. To do this, use special tools, techniques.

Some controls are available to the ordinary user:

• On the wire without heat treatment and the protective layer should be no traces of dross and cracks.
• With a diameter of 0.5-6 mm high-quality products maintain integrity after 4 bends.
• If galvanized wire coiling is performed, the protective layer does not peel off. It is essential that it completely covered the entire surface.

Price per bay wire diameter 1, 2 mm, weighing about 4.6 kg, length - 550 m is from 500 to 600 rubles. Smaller thickness should not be selected to provide the necessary strength of the carcass. Too thin products (less than 1 mm) are broken when tightening force nodes. If you choose a thick (greater than 1.8 mm), the work is too hard. Approximate consumption per 1 t of valves 20-25 kg of wire.

For accurate calculation is necessary to specify the number of connections of nodes. Some create overlap. In such places need to create several fixtures. It has a cross section of the reinforcing rods. When small diameter wire may need more turns to provide a reliable fixation.

How many need to wire 1 ton of steel framework, clarify with the help of the size and characteristics of a particular strip foundation. To simplify the calculation, use specialized software.

The cost of one packaging (1 pcs.) Is 1300-1450 rubles. These blanks expensive compared with the wire in the bay. But a more detailed study of the processes will let you know what to work with such products more convenient and faster.

A calculator for calculating the amount of wire for binding reinforcing cage strip foundation

The following description will help you to use modern means of automation:

• First, you need to specify how many rods will be used (4-8) for the creation of a longitudinal carcass reinforcement.

• In the next window the calculator indicate the final length of the assembly. It is necessary to consider not only the load-bearing walls, but also to support under Interior walls, technological equipment.
• Next you need to determine the distance between the clamps to be mounted with the same pitch.
• Given the number of building corners mark the respective nodes of the foundation tape.
• At the final stage the data was entered on the adjacent parts of the structure.

The figure marked corner (1) and adjacent (2) nodes. After final test data and confirm the calculation is performed automatically in a few seconds.

This result should be corrected. It should be understood that not every piece of wire will tighten with the exact force, without breaking. It is not always possible to immediately determine the optimal length of reinforcement. Since during the operation may have to be several docking segments amplification of individual sections. The low cost of wire - one more argument in favor of 30-40% of the stock from the calculated value. This consumable is useful for a variety of economic and construction challenges of the future.

Tools for mating fittings

To properly create a strong frame "bare hands" too hard. Operation knitting, even when using soft wire requires the application of residual great effort.

The best option is to use power tools. They, as well as other technical tools, are discussed in detail in the following sections of this article.

Crochet gun fittings

The standard set of modern manufacturers include:

• The mechanism of electric drive, which creates a knot, and cuts the wire.
• Battery with a separate power supply. Its presence facilitates the execution of works in standalone mode, without connecting wires connecting to the mains of 220 V.
• Case for fastening tool belt assembling.
• Operating instructions and bag for transport and storage.

Note! If you plan to do a lot of work, you can use a special extension cable. This device allows you to create connections without tiring of the slopes.

Wire gun is offered in the form of a wound on small bobbins. Manufacturers are strongly recommended to use only certified consumables, to extend the life of equipment, to maintain warranty.

The following benefits will be useful in the selection of this option:

• high quality associated with the same force units;
• productivity increase by 2-4 times compared with manual methods;
• decrease fatigue;
• possibility to perform working operations in a wide temperature range.

For objective analysis should not forget about some of the restrictions.

Penetration into the lower tier, complicated angular space with a large equipment difficult.

To acquire this equipment to implement a single plan does not make sense. Cheaper - to take it out on the number of days. You must purchase a sufficient amount of consumables and accessories are to carry out manual work steps.

Hook for mating fittings

With this compact tool is convenient to operate in narrow trenches, confined spaces. Improving self-made design will help to improve its consumer characteristics:

• You can use the appropriate length of the reinforcement section of a minimum diameter for the manufacture of crochet hook (6 mm).
• The strength of the metal higher in comparison with the nail. The presence on the surface of the protrusions begged performing working with wire operations.
• Create the necessary form can be without drawings, modeled on the factory products, drawings, photos.
• The thickness and length of the handle, and other product specifications are not difficult to find in view of the preferences and physiology of a particular user.

In this device, a spring mechanism is inserted, which ensures the rotation of the hooking device and a wire loop. Screwthreaded rod moves upward to node inhaling. These actions collectively accelerate the execution of workflows, reduce the burden on the user.

They fastened the hook in the cartridge. The ends of the wire, rolled into the ring, rotated by an electric motor, quickly and without much physical effort. As with the gun for binding in this case it is also better to use a tool with a built-in battery.

Tying rebar by strip foundation

Under pouring concrete for the foundation of a small structure suitable composite and metal fittings. With both technologies can be found below, in separate sections. This video shows one of the knitting techniques.

The right to choose suitable way easier after getting acquainted with all the options.

Working with metal reinforcement

For this method will need to cut the workpiece with their hands ± 28 cm length. Next, the wire is folded in half and threaded (1) so that the loop was greater overlap with mating fittings. Twist makes using hand instrumentsOr a corresponding technique. In any of the options should be exactly dosed make an effort not to break the fastener. Upon completion of the basic operation of the protruding wire is charged with his hands inside the lattice structure.

In this example, use tongs. This tool is useful when working with thicker wire, to create complex assemblies. Please note that some of these options do not fix the valve tightly. They allow the movable rods in one direction (vertical / horizontal).

Note! The use of wire has the following advantage in comparison with welding. It enables small mobility compounds nodes. This is useful in the process of pouring a layer of concrete to construct the foundation has not been damaged by a slight deformation.

Nowadays often used stud fitting plastic clips. These universal clamps are suitable for different sections of the tendons. They weigh little, not dirty hands, installed without the use of special tools, instruments. Such tightening-clamps retain the necessary flexibility rebar.

The only significant drawback is higher compared with the cost of a metal wire. Experts stress that must be remembered relatively small strength connections until the time setting mortar. It should also be aware of the increased brittleness of the polymeric products by lowering the temperature below 0 ° C.

Note! If there are no significant budget constraints, you can purchase a durable plastic collars with metal core.

These products are manufactured in a wide range. They are used at the corners, and support structures.

With such products accelerate installation. But are these fasteners are more expensive than the binding wire.

Tying fiberglass reinforcement

Application of composite reinforcing material is limited rules discussed above. When you select this option necessarily need accurate professional calculation. Particularly great importance when using the knitted fiberglass reinforcement to the tape base has uniform load distribution.

Note! Typically, the distance between the individual polymer rods mounted in a frame at least 20-30 cm. Only in the construction of the lightest of its architectural structures increased to 50-60 cm.

In these clips to insert the bars turn faster than knitting the reinforcement cage using the "traditional" consumables.

Allowed the use of aluminum wire, which does not damage the plastic surface. During the creation of the nodes use the same techniques and devices, and that when working with metal reinforcement.

Important! When installing the lower reinforcing belt set underneath the polymer base. It is recommended to apply a small distance between the supports. This solution is used for total hardening fiberglass frame and prevent deformation at casting step heavy concrete. These objects are achieved by means of additional fasteners, made of metallic reinforcement.