Strength building structures It is helped to provide reinforced concrete products. Their forms, dimensions are varied. Some produce directly on construction siteOther are prepared in production. No construction do without reinforced concrete runs.

Definition

AppearanceThe run structure is almost not different from the reinforced concrete pillar. Externally they look like a frozen concrete solution with metal carcasy Inside. What is the difference between runs? Different designs are large mass, long and enhanced strength. The production of structures is not delivered to the stream, their release is associated with the need for the element to withstand a certain load.

Purpose

Ramo reinforced concrete are used in construction in order to solve an important task. For example, none of the opening can not be done without the use of the run. Only after it is installed plates of overlaps. And reinforced products made under the influence of heat treatment, withstand heavy loads. Used in the construction of public, industrial buildings With brick and reinforced concrete walls. Most often used in the construction of openings, supports on which plates of overlaps are attached.

Reinforced concrete runs prepare exclusively industrial methodAccording to state construction standards. For their production, only heavy concrete is used, more often than M200 and M300, with the use of reinforcement for reinforcement. Using designs B. favorable conditions Increases the service life of buildings.

Views

Reinforced concrete run is divided into species that are formed according to the form of the product and brand of concrete. Runs are assigned the following types

Taurus cross section

In the production of seams and boutons are used. This type is divided into two types:

• The first group includes products with located perpendicular to the ribbed of the ribbon metal. They are suitable for the construction of buildings that have about 25% of the inclination of the roof. 1PR core frame, 2PR pre-created voltage, 3PR is used when the roof is biased no more than 5% - the species of the first group.
• In the second group, products that carry out the angle of inclination of the roof of 25% are included. It includes 4PR products stressful and 5PR artificially created voltage.

These designs can be used for unheated premises. Used B. temperature mode From - 40 to 50 degrees and gas exposure. Characteristic feature It is an opportunity to apply products in the construction of structures in dangerous, seismically active zones.

The difference is the presence of special holes, which makes the gripping devices, facilitate the rise and installation of elements. Elements with a taving section are suitable for building buildings:

• unheated with roofing from impurities of cement and asbestos fibers;
• heated with lightweight floors;
• heated with cement roofing.

Rectangular cross section

This type of run has a foreign division. The rectangular cross section of the runs can be solid and lattice. The lattice look is easier, a step of placement of products is 6 meters, so it is used in construction much more often. For the production of solid species use bent seams. Products with a rectangular cross section have thin walls, but excellent height. The strength of the products provide specially created fastenings of the fastening.

Marking

The manufacture of building structures are suitable in compliance state standards and technologies. You can get the maximum product information by studying the product series. The inexperienced builder will not be able to get complete information on labeling without knowledge. It is worth navigating the decoding data.

For ease of use, a special classification of letters and numbers is applied. They are encrypted information about length, height, width, reference load. In the first letters information about the rank series is encrypted:

• P is a one-piece product.
• Pr - the presence of a side, located in parallel or at an angle to the axis of the element.
• PRG - rectangular cross section.

The second group of signs contains information about the load and type of reinforcement. Third signs are talking about the specific purpose of the material, including the features of the use of concrete.

For example: PRG 28-1-3-4T. PRG - rectangular cross section. The next digit series indicates the dimensions of the design: 2800 length in mm, 100 mm width, 300 mm height. The 4T indicator indicates the ability to withstand a load of 4 tons per meter.

PRG reinforced concrete runs are manufactured in accordance with the 1.225-2 series, designed for overlapping openings in the walls. public buildings and administrative-domestic buildings from brick or wall blocks and are calculated under the calculated pressure of 4000 kgf / m, i.e. Used B. carrier walls With the ability to be based on both the slabs of PC overlap and overlying masonry.

Manufactured out heavy concrete M-250 brands for compression, and for 6-meter - M-350. Reinforcement is possible 2 options: pre-stressed, reinforced by the prestressed reinforcement rods of the ATV brand and spatial frames and unprotected, reinforced by only spatial steel frames. Most often produced not intense, i.e. with conventional reinforcement

Since the load of the overlying wall is quite large, and the surface area on which the run is pretty small, it is recommended to use support plates as lining during construction, which allow you to distribute the load for a larger surface.

The standard length of the product provided by the series can be 2.8; 3.2; 3.6; 4.2; 4.8; 5.4 and 6 meters. However, under the order it is possible to manufacture reinforced concrete runs and intermediate sizes.

Marking

The label consists of alphanumeric groups separated by a hyphen:

• The 1st group contains the designation of the type of PRG-ROGO dimensions (Length, width, height in dm.).
• The 2nd group includes the estimated load without taking into account its own weight (in TN / M) and the class of fittings used.

For example, PRG 32.1.4-4ATV - run rectangular cross section A length of 3180 mm, a width of 120 mm, with a height of 400 mm under the calculated load without taking into account its own weight of 39.2 kN / m (4 tons), reinforced steel ATV, i.e. Pre-tense.

Dimensions and support