Steel arch supports have the advantages of high initial support force, large support strength, easy installation, and non-deformation. Therefore, they are often used in the manufacture of retractable metal supports for mine tunnels, secondary support of mine tunnels, and support for tunnels in mountains Protection and other uses.
The steel arch support is mainly composed of the following parts:
Top beam The top beam is arc-shaped, and its number depends on the size of the roadway section, the force of the support, and the transportation conditions. There are 1 or more sections.
2. Column legs. There are three types of column legs, one is a circular arc in the upper part and a straight line in the lower part; the second is all curved and has only one radius of curvature; the third is all curved but has two curvatures radius. A base is welded under the leg, and the size of the base depends on the hardness of the base plate;
3. Connection piece. The connecting piece is a clamping device between the brace section and the intersection, which can play the role of intersection connection. It can also press the two sections of steel joints connected to provide pre-tightening force, so that the U-shaped steel has friction, so as to ensure The arched bracket has a certain working resistance and a certain amount of shrinkage.
4. Tie rods between shelves. The role of the inter-rack rod is to enhance the overall relative stability of the stent, and to connect the stent from the longitudinal direction to form a whole.
5. Backing material. The backing material is a filling material between the U-shaped steel bracket and the surrounding rock, the purpose is to make the U-shaped steel bracket contact the surrounding rock closely, improve the stress condition of the bracket, increase its bearing capacity and maintain the stability of the surrounding rock.
The application of steel arch support at the crossing point of mining accurate roadway has achieved significant results. The use of U-shaped steel support can better solve the problem of excavation and support. The steel arch bracket has a high recycling rate and reduces the use of pit wood, which has obvious environmental benefits.
