One way to connect framing elements is to use. It can be used if the construction technology does not strictly stipulate the need for joining the reinforcement by welding. Knitting wire is a type of long rolled steel. Produced in accordance with GOST 3282-74, it is made of low-carbon steels. The best option - thermally treated (annealed) wire, it is softer and more flexible than thermally untreated one. Able to tightly fix the reinforcement in the required position. For use in critical structures or with increased requirements for aesthetics, galvanized products are used. Knitting wire is in demand when insulating heating plants, making fences, chain-link mesh, reinforcing nets.
Dimensions and weight of knitting wire
The diameter of this product is not regulated by GOST, but usually products with a section of 1.2-1.6 mm are chosen, maximum size section - 2.0 mm. Thicker wire is difficult and inconvenient to work with.
For knitting wire with a diameter of 1.0-1.2 mm, the maximum permissible deviations in diameter are -0.05 ... -0.12. To determine the length of wire in a coil, you need to find out its total weight and divide this value by the mass of 1 m.
Weighing table for 1 meter of knitting wire, kg
You can also determine the mass of 1 m of wire using the formula.
M \u003d ρ * S * H, where:
ρ is the specific gravity of steel knitting wire, kg / m3;
S is the cross-sectional area of \u200b\u200bthe wire, m2;
H - length, m.
S \u003d (πd) / 4, where:
d - section diameter, m2.
Weight of knitting wire skeins
Manufacturers offer wire in coils or wound on spools. The standards regulate the minimum coil weight for products with cross-sectional diameters of 1.2-2.0 mm. For "black" knitting wire, this value is 8 kg, for galvanized wire - 2 kg. The maximum weight is 1500 kg. The specific weight of the coil or coil is determined by agreement with the customer. Regardless of the weight, there can be only one piece of wire in a coil, and no more than three in a coil. Upon shipment, the manufacturer indicates only the weight of the batch, the length is not indicated. It can be calculated only approximately, since the section diameter may be less than the nominal one.
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Knitting wire GOST 3282 74. How much wire needed for tying fittings.
In the production of low-carbon steel wire for general use in accordance with GOST 3282, after heating and then cooling, a wire with scale is obtained - a dark wire, and without scale - annealed, light. Our company sells annealed wire - heat-treated, hardened, it is also called knitting wire. It is more flexible and durable, less likely to break when bent than untreated. Annealed wire knot tightly fixes the reinforcement in the specified positions.
Knitting steel wire it is used not only for tying reinforcement, but also in the production of mesh, nails, for decorative purposes, when weaving cables, to hold structural elements during welding.
Compared with welded reinforcement cages, knitting wire foundations are the most durable. The reinforcing metal frame connected by a knitting wire has flexibility and elasticity, and in the case of swelling of the soil, freezing of the soil, deformation of the foundation does not occur.
Knitting galvanized wireprevents corrosion of the foundation metal, such a foundation is more durable.
Consumption of knitting wire for reinforcement, weight of one meter
Wire GOST 3282 produced in bays, usually up to 100kg. To determine how many meters of wire are in the bay, you must first calculate the specific gravity (the mass of one meter of wire), or use the tabular data of the theoretical weight according to GOST (found on our website). To calculate the weight of 1 meter yourself, you need to weigh a small piece of wire and divide it by the length of this piece in meters.
We calculate the weight of a running meter of wire as follows:
М \u003d qSh,
where M is the weight of 1 meter of wire,
q - density, or specific gravity of the metal (for steel is 7850kg / m ^ 3)
S - cross-sectional area of \u200b\u200bthe wire in sq. m,
h - wire length in meters.
S \u003d 3.14d * d / 4, where d - nominal diameter in meters.
S \u003d 3, 14 * 0.0012 * 0.0012 / 4 \u003d 0.00000113 m^2,
M \u003d 7850 * 0.00000113 * 1 \u003d 0.0089 kg,
L \u003d 70 / 0.0089 \u003d 7865 m.
Despite the fact that the actual weight of the meter galvanized knitting wire less than the calculated one (due to the different density of zinc and steel) for calculating galvanized wire use the same formulas as for non-galvanized.
Calculation of knitting wire at work
First, calculate the amount of required reinforcement and the number of nodes that will be obtained when tying. Then the knitting wire is calculated. Regarding the binding of fittings, there are no norms and requirements according to GOST, recommendations for calculating the amount requiredwire 3282 GOST are based on the personal experience of specialists. Some argue that the average consumption of knitting wire is 10 - 15 kg per ton of reinforcement, while others - that 15 - 20 kg, depending on the size of the cells of the reinforcement cage. Also, professional builders have different calculations for the amount of wire - 10-15 cm and 30-50 cm for each knot. These are quite relative indicators, first of all, when calculating the required wire, you need to take into accountreinforcement diameter and the wire itself.
General rules for working and purchasing knitting wire:
you need to buy wires with a margin - twice as much as it was calculated, because when linked, it breaks, bursts;
it should be borne in mind that at the points where two horizontal reinforcement bars intersect with one vertical one - there will be two nodes;
knots are knitted in a checkerboard pattern - through the joint,
the overlap of joints is taken into account, it can be from 20 cm to 80 cm,
to link wire 1.2 - 1.5 mm per knot of wire will take more than thicker wire, but thicker wire is much harder to work with.
to link reinforcement diameter 8 - 12mm is the most convenient to useknitting wire 1.2 mm ... For larger rebar diameters, thicker wire is usually used. Fromwire diameter the quality of the reinforcement cage joints depends.
They also calculate the length of coverage of the surface of the bars (F):
F \u003d 2 * 3.14 * D / 2, where D - reinforcement diameter in mm.
For example, for winding a wire around a barfittings 12mm , it is necessary knitting wire, length:
2 * 3.14 * 12/2 \u003d 38mm \u003d about 4cm.
There is another fairly easy way to calculate the amount of wire for tying reinforcement: they use such a concept as the size of one knitting wire element, equal to 0.3 - 0.5 m. Thus, to find out how much wire is needed, the number of knots is multiplied by 0.5 m.
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