Section steel is a kind of steel with a cross-section shaped like English letters. The cross-sectional shapes, geometric parameters and materials of the section steels produced in various countries are different. Currently, there are four main types of section steels produced in China: Among them, it belongs to waist positioning and ear positioning. Due to its low carrying capacity, it is rarely produced.
Specifications of profiled steel brackets, profiled steel brackets, profiled steel brackets
Profiled steel has the advantages of high initial support force, high support strength, easy installation, and not easy to deform, so it is often used to make retractable tunnels Flexible metal brackets are used for mine tunnels, secondary support of mine tunnels, and support for mountain tunnels.
The steel telescopic bracket is mainly composed of the following parts
Beam. The top beam is arc-shaped, and its number can be divided into sections or multiple sections depending on the size of the tunnel section, the stress on the bracket, and the transportation conditions.
Legs. There are three types of column legs. One is that the upper part is arc-shaped and the lower part is a straight segment. The second is that they are all curved and have only one radius of curvature. The third is that they are all curved but have two radii of curvature. A base is welded under the column legs, and the size of the base depends on the softness and hardness of the base plate
Connectors. The connector is a clamping device between the bracket sections. It can connect the sections. It can also compress the joints of the two connected sections of steel to provide pre-tightening force so that there is friction between the section steels, thereby ensuring that the arch The shaped bracket has a certain working resistance and a certain shrinkage.
Between tie rods. The function of the tie rods between the racks is to enhance the overall relative stability of the brackets and connect the brackets longitudinally to form a whole.
Lining material. The backing material is the filling material between the steel bracket and the surrounding rock. The purpose is to make the steel bracket and the surrounding rock in close contact, improve the stress condition of the bracket, increase its load-bearing capacity and maintain the stability of the surrounding rock.
The profiled steel supports must be reasonably calculated during design and should also be used reasonably in order to ensure safe production in mines and improve economic benefits.
The application of profiled steel straight wall semi-circular arch support sheds in the mining of tunnel intersections has achieved remarkable results. The use of profiled steel retractable supports has better solved the problem of excavation support. Compared with other rigid supports, the steel bracket has retractability and stable and reliable bearing capacity. It can adapt to the load and deformation of soft surrounding rock. It has high cross-section utilization rate, easy support and return of the bracket, small maintenance volume, high bracket recycling and reuse rate, and reduces the number of pits. Use, the environmental benefits are very obvious.
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40U steel bracket for mining