Assortment of fittings: the right choice as a guarantee of reliability

Production of reinforcing steel, as well as the release of goods other industries, unified. To determine the quality of the products use specially designed State Standard requirements for production of different parameters. In this form of production standards set for the diameter, weight and sectional bars. All these features are combined in one term - the assortment of accessories. For more details about the complex requirements of this article will tell.

Scope, particularly valves diameter, classrooms, marking, corresponds to GOST

Fittings - an important component in the overall list of building materials. It characterized by a wide range of applications in various stages of construction of buildings. Without it does not do any one reinforced concrete structure that serves as reinforcement and support in the basement of a small house, and in the construction of large-scale railway bridge or overpass. Reinforcement technology is used even for hardening glass constructions.

Already at the initial stage of the development of design estimates for every self-respecting engineer and architect has on hand special table weight ratios and footage fittings, as well as sections of reinforcing rods in accordance with the state regulations. The main among them - GOST 5781-82. Also, products must comply with GOST 52544-2006, STO AISU 7-93, TU 14-1-5254-94. Norms regulate the requirements for the particular type of fiber reinforced products. Their combination corresponds to the term - the assortment of accessories.

Reinforcement is a round metal rods with smooth or corrugated surface. They produce them of several types of steel. The diameter of the rods ranges from 4 to 80 mm. The product range is divided into classes A1 - A6.

Diameter, that is, the size of the cross section of the rod or wire reinforcement - is the main indicator of the underlying product mix. Hence, the relevant terms: armature 8 mm or 1 wt armature 12 m. These products are classified and other properties, including strength, durability, weight, and other characteristics, which are considered below.

reinforcement classes: product mix of strength and mechanical parameters

The word gauge (or assortment) in French sounds like assortir and means "to choose", ie. E. disassemble on grades in accordance with the typical characteristics. These parameters include:

• the material used for manufacturing the product;
• dimensions of reinforcement, such as size, diameter, type of surface;
• profile.

Useful advice!Packaging products is carried out according to its classification in diameter. Valve metal to 10mm released in coils, and over this parameter packed rods of defined length.

fittings is used in the construction work in the form of rods, mesh, or wire frame. Based on the destination, it is separated into a constructive, anchor, mounting or working. This takes into account the presence or lack of tension, and the need to strengthen the structure at a particular site. Amplification can be longitudinal or transverse.

Mark and classify the valve and other characteristic features, but first and foremost take into account the diameter of reinforcement, as well as the degree of strength, flexibility and mechanical properties. Symbol in the labeling mix are uppercase letters A (sometimes in) a specific index, which indicates compliance with the fittings separate class. The main and most popular classes of reinforcement in the construction discussed in this article.

Table gauge valves: designation and characteristics of different classes of

In construction terms, and labeling are sometimes confused even the professionals. Different types of materials, including fittings, have their own classification, which makes it possible to simplify and standardize many processes.

Finding your way in the classification and labeling will help special table of reinforcement classes. It has a fairly simple and clear structure, consists of several columns, where the first - this is the main labeling, and more - relevant characteristics:

• weight;
• sectional size or diameter;
• resistance to stress;
• embeddability in stressed concrete construction;
• the relative magnitude of the elongation after rupture;
• rod length;
• steel grade.

The table may contain more extended information, for example, allowing to calculate the weight per meter armature or vice versa, to calculate how many meters per tonne of 12 mm rebar. Suitable for novice builders simplified version with a minimum of background information.

Class reinforcement comprises several digital and alphabetic notation determining its strength, the size and purpose. Thus, according to the table mix valves, GOST 5781 82 regulates the old and new label. To carry the old products belonging to the classes of AI to AVI. Accordingly, a new designated as follows: A240, A300, A400, A500, A600, 800 and A1000.

Class A240S armature has a smooth outer structure, and the products labeled A300S, A400S, A500S and A600, A600K, A800, and A1000 A800K - knurled surface.

Useful advice!There is a certain encryption reinforcement having the form: A reinforcement-400-C Ø12. Where the letter A denotes a marking material number 400 - class valve 12 - the diameter of the rod.

Explanation reinforcement table with the characteristic of each class

Each class has its own fitting response, with much of the data may be the same in different species, or radically different. Their main parameters are given below.

AI or A240 - armature, representing smoothbore rod cross-section from 6 to 40 mm. It is used in the manufacture of concrete products for construction of monolithic and support structures. Fittings of any diameter to produce rods, packed in the package. Allowed production section up to 12 mm in coils.

AII or A300 - a profile with a corrugated surface and a diameter of 10 to 80 mm. It belongs to the materials, retaining a lot of pressure. They serve as the basis of the supporting structure, which is experiencing the brunt. Maloetazhek used in the construction of monolithic buildings and during repairs.

AIII or A400, A500 - rebars having a periodic profile with a cross-section of 6 to 40 mm. The most popular class of fixtures wide application in housing construction as well as in industrial or commercial. It is also used in the production of reinforced concrete in the construction of roads and sidewalks. Products with a diameter of 10 mm is produced in coils, over a given size - in the rods.

AIV or A600 - 10-32 mm diameter rods. They are used in the construction of intense elements. Products similar to class AІІІ products, but have a lower frequency edges.

AV or A800 - rarely occurring assortment of fittings possessing a high degree of strength. Used in the construction of very large and heavy objects such as bridges, piers, underground hydroelectric power station.

A6 (A1000) - is made from heat-resistant steel. It has an increased level of resistance to various kinds of deformations. It is used in high-rise construction.

Fittings A500S: GOST, key parameters and characteristics

Since the third category is the most common, what class of reinforcement (A400 or A500) to choose - it's up to designers to take into account all the nuances of construction work. Talking about the structural characteristics of this kind, should pay attention to GOST A500 rebar. It regulates the production of round profile, having two edges along the shaft and parallel rows across the crescent-shaped projections. However, they do not intersect with the paired fins along the rod body.

Profile has high ductility and strength properties in the rolling process. A500 reinforcement rods have a minimum length of 6 m, and the maximum - 25 m optimal length rods -. 12 m. According to Table gauge A500S fittings made of stainless steel St3sp labeled, and St3PS St3GPS. The material has excellent weldability, but this is not its only advantage.

Useful advice! Joining elements may be fixtures A500S using electric arc welders. In such an advantage, and the letter C indicates the marking profile. Weld quality decreases the minimal presence of alloying elements.

Positive properties such valves are as follows:

• an increased degree of strength and flexibility, without weak points, which can cause destruction of the reinforcement;
• the relatively small cost of production and, as a consequence, an affordable cost of reinforcement per tonne;
• A500 proportion valve means significant savings in amounts of steel manufacturing process.

GOST requirements: fittings B500, especially its manufacturing

A500S valves are successfully used in the struts. The quality of the concrete is increased by reducing the amount of steel structures in the columns. Profiles can be used in the projects, which shows the cross section of classes and AІ AІІІ. Analogue of the A500S universal fittings can be a fitting B500.

B500S fittings for chemical and technological characteristics of raw materials and structure in line with European standards. The main advantage - flexibility. The high degree of plasticity reinforcing constructions prevent the destruction of buildings. Reinforcing products of this class in the Russian Federation were carried out according to GOST R 52554. It is intended for the construction of buildings of lightweight concrete and weighted.

These structures operate in hostile environments. Used as a reinforcement in the form of independent rods, and in scaffolds and welded products. B500S on the characteristics of an effective substitute for valves labeled A400, A400C, A240. B500S fittings has the following main parameters:

• produced in accordance with European standards, which enables the use of European equipment;
• It does not twist due to lack of stripes;
• is lengthened by 1.4%, maintaining a load of more than 3%;
• It characterized by excellent weldability.

As for pricing, it is different and depends on the characteristics of the reinforcement and the amount of required products.

Related article:

Frame: weight and length, and the ratio calculations in construction work

Examples of the calculations and the need, the support table. Correlation of length, weight and diameter of the rods. Applying online calculator.

Range of fittings: additional labeling options

In order to determine a more specific characteristics of valves, a special additional marking system. For example, A5K abbreviation, it profiles A5 class and the letter K indicates the presence of additional protection against corrosion. To this material was treated with special means that ensure its longevity.

With the presence of the letters in the marking indicates that the valves can be welded. Please be aware that not all articles belonging to different classes, can be welded to each other, especially in the absence of the mark C designation.

Speaking of valve assortment, it should be mentioned that the term as locking (or pipe) fittings. These types of profiles used in the sanitary field. Accordingly, as a separate subspecies material, this armature has its classes and marking. In this case, the main parameter of choice - tightness. This criterion indicates the quality of the mining site in the pipeline, without which it is impossible to collect. tightness in the figure indicate the characteristics of the packaging material.

Useful advice! Interconnected reinforcement bars with different marking and in the absence of a better designation letter C using special couplings and wire.

How to determine the area of ​​reinforcement: a table of calculations

sectional area of ​​reinforcement - one of the most important parameters that lead to strength. The higher the intended load, the area should be greater. To see this data, you need to contact your dealer, advisor or read the product data sheet. If the product is purchased second-hand, you'll have to do the calculation yourself. To do this, follow this steps:

1. Measure the diameter. It helps caliper. Please note that the result can be non-circular unit, so it is rounded, guided by mathematical rules.
2. Determine the area of ​​the fitting section on its diameter, using a special table. You can use it to calculate how much weighs 1 meter valves and how many meters in a ton of rebar.

Table mix valves, a weight of 1 meter and diameter.

The cross-sectional area, cm²	Diameter of reinforcement, mm	Weight per meter reinforcement g	How fitting a ton, m
0,283	6	222	4505
0,503	8	395	2532
0,785	10	617	1620
1,131	12	888	1126
1,54	14	1210	826
2,01	16	1580	633
2,64	18	2000	500
3,14	20	2470	405
3,8	22	2980	336
4,91	25	3850	260
6,16	28	4830	207
8,04	32	6310	158
10,18	36	7990	125
12,58	40	9870	101
15,48	45	12480	80

Due table can easily determine other data, for example, how many meters per tonne of 12 mm rebar. We are looking at figure 12, the diameter of the column and find the corresponding value in the column length. This parameter is 1126 m.

Independent calculation of reinforcement area, the online calculator

If there is no need to independently measure the table diameter. Assume it is equal to 6 mm, this figure is divided by 2 to find the radius. We obtain results - 3 mm square in its erect - 9 mm. The resulting number must be multiplied by a constant area of ​​a circle Pi equal to 3.14. The result of calculations - 28.26 mm² or 0.2826 cm². This figure is independent computation corresponds to the data contained in the table.

This method of determining the cross-sectional area is ideally accurate if reinforcement rods are smooth. For bars with a ribbed surface calculations are somewhat complicated. These products have a larger area and have a higher degree of coupling with a concrete solution, which makes them indispensable in the construction of reinforced concrete skeletons. calculating process includes the following steps:

1. Calculation of overall diameter indicator. To this end, two measurements are made - on the ribbed surface and a narrow recessed portion. To obtain a more accurate measurement is better to spend extra to multiple destinations.
2. Determination of the arithmetic mean by adding indicators and dividing this sum by two.
3. After calculating the diameter of the sectional area of ​​reinforcement is determined by the method described above, according to the formula: S = π * r², where S - area; π - constant of 3.14; r - the radius.

Useful advice!If the tables are not available, the weight determined using special calculations.

Computer software and Internet technologies greatly simplify the process of calculating the cross-sectional area of ​​reinforcement. Calculator-Online lets you do this in minutes. Simply enter the desired parameters in the cell to instantly receive the finished result.

What is the weight meter valves and meters as reinforcement in ton: examples of calculations

Skills in calculating rod diameter as the calculations need armature weight. Such knowledge is essential in the preparation of projects and construction budgets. The exact determination of the mass of reinforcement can save on the purchase of materials. It is important to note the fact that large manufacturers sell rebar price for 1 ton, not per square meter. However, the cost of production in such a case will cost several times cheaper.

As an example, consider how to calculate the mass of material required for the construction of reinforced concrete foundation total length of 100 m diameter valves -. 10 mm. Seek the necessary data in the table, they correspond to 617 g This number is multiplied by 100 and get 61 kg 700 g Weight 1 meter fittings can be calculated in other ways (out of three):

• at standard table;
• using data on the proportion of the reinforcement;
• using armature weight calculator.

The required number of rods regulatory weight is calculated using the weight of the table above in relation to the meter. This is the simplest version of the calculation (except for online calculator).

For example, to be used for the construction of reinforcement 14 2300 m. Weight 1 meter bars was 1.21 kg. We produce calculations: 2300 * 1.21 = 2783 kg. Thus, to perform this amount of work required 2 t 783 kg of steel rods. Similarly calculated number of rods in one ton of the corresponding diameter. The data is taken from the table.

Price per ton valves and meter cost components

The formation of the price of any product affected by several factors. This also applies to accessories. Different values ​​are smooth and grooved bars, because the last production involves more time-consuming and lengthy process. The more complex the technology, the higher the price of the finished product.

The formation of value also influence the strength and ductility of the material. In order to improve these indicators in the alloy added to silicon, or chromium, and for flexibility - manganese. The fluidity of steel is also important.

In addition, the price formation depends on the quality of label. For example, in addition to pay for fixtures with a tag T indicating thermostrengthening, or K, which indicates the resistance to corrosion.

Useful advice!An important indicator of the cost - volume products. Fittings, purchased in large quantities (tons), is much cheaper.

Manufacturers operate on the same principle: the higher the sales, the better. That is why the volume of purchased products a significant effect on its value. Accordingly, the fitting price for 1 meter will be much higher than the purchased goods in tonnes.

The fact how much meter valves, and influences the seasonality of the work, as any building depends on weather conditions. Therefore, in the autumn-winter period, the price for rebar, as well as other types of building materials, significantly drops. This period is considered to be the most optimal for the purchase of the goods, but you should take care of the appropriate storage.

Reinforcement is an important material in the modern capital construction. it kind of metal has some serious quality characteristics and operational requirements GOST regulated. They are displayed in special tables and regulations, referred to as the assortment of accessories. Knowledge of its basic indicators and the ability to carry out correct calculations will not only buy a quality product, but also greatly reduce the cost of its purchase.