There are many types of Steel Supports in the mine. Steel Mine Supports has simple structure, high strength, good stability, no deformation, and can be recycled. It is often used in mine roadways, secondary support of mine roadways, and support support for mountain tunnels. local. The Steel Mine Supports models produced by China Coal Group are mainly U18, U25, U29 and U36.
The top beam of Steel Mine Supports is arc-shaped, and its number is divided into 1 section and multi-section depending on the section size of the roadway, the force of the bracket and the transportation conditions. There are three types of legs: one is a circular arc on the upper part and the straight section on 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. The base of the column is welded with a base. The size of the base depends on the hardness of the bottom plate. The connecting piece is a clamping device between the bracket and the joint, which can be used for the connection between the joints, and can also press the two sections of the connected steel joints. The pre-tightening force is provided to make the friction between the U-shaped steels, thereby ensuring that the arched bracket has a certain working resistance and a certain amount of contraction. The role of the inter-rack tie rod is to enhance the overall relative stability of the bracket, and the brackets are coupled from the longitudinal direction to form a whole. The backing material is the filling material between Steel Mine Supports and the surrounding rock. The purpose is to make Steel Mine Supports close to the surrounding rock, improve the bearing condition of the bracket, improve its load carrying capacity and maintain the stability of the surrounding rock.
