Reinforced concrete trays are used, as a rule, in the construction of roads, heating mains, in housing construction and for the needs of water disposal. They provide water resistance, durability and safety of communications, a high level of frost resistance. Such trays are resistant to mechanical stress and allow you to easily maintain systems during repairs or upgrades. Reinforced concrete has high anti-corrosion properties, which is due to the use of heavy concrete with a frame made of steel reinforcement of classes A-1, A-3, Bp-I. This guarantees a low accident rate of such structures.
The conditions for operation in which reinforced concrete trays are intended, and the functions that they must perform, require various modifications (types) of these products.
Types of trays and application features
Trays are divided into several types, which differ in size, shape, drainage principle and laying method. Main types:
- trays for heating mains, channels, tunnels (protection from cold,water, ground pressure. Closed, laid in the ground);
- telescopic trays (for draining water during the construction of roads, bridges. They are laid with a slope according to the tile principle);
- bait trays (to collect water along sidewalks, highways, parking lots);
- drainage trays (for the removal of groundwater and storm water from railway tracks, runways and for the construction of hydraulic structures);
- cable trays (for protection against damage to cables or wires).
Reinforced concrete trays: GOST, operating conditions
Trays are made using vibrocompression technology of rectangular or parabolic shape. Strict requirements of GOSTs are imposed on production. In projects, trays of typical series are usually laid, for which there are working drawings and recommendations for use.
In accordance with the standards of the Russian Federation, reinforced concrete trays GOST 13015-2003 are manufactured. Concrete for trays must meet the requirements of GOST for frost resistance and water resistance, resistance to aggressive environments, protective layer thickness, corrosion resistance (separate requirements for reinforcement) and certain component standards.
The trays are covered with plates to prevent clogging.
To ensure resistance to atmospheric precipitation and strength, reinforced concrete trays are made of concrete of classes B15, B20 and B25.
The outer walls of the trays, which are buried in the ground, are waterproofed by coating with bituminous materials in two layers.
If it is planned to operate reinforced concrete trays in aggressive soils, then their walls are covered with special protective compounds.
Dimensions and markings of trays
Each type of tray has a specific marking, written in alphabetic and numeric values.
For example, LK 300.180.90-3. At the beginning there is a letter indicating the type of product (LK - channel tray), or standard size (L-4), the numbers indicate the length, width and height, the vertical load index is written through the dash (tf / m 2). Letters can also go further (“d” - additional, “a” - with mortgages).
Reinforced concrete trays are produced, the sizes of which are selected depending on their purpose, categories and types. They differ in weight, length, width and height, are open and closed. The price depends on the size and the required number of trays.
Slabs that are used for the bottom device are marked PT, and for overlap - PD.
