As an alternative to miner steel supports, steel arch supports are also required for market development. With the development of the coal and mineral industries, the coal seam is getting deeper and deeper, and the pressure is becoming greater and greater. The support requirements of coal seams are gradually highlighted by steel arch supports.
The steel arch support consists of the following structures: top beam, column leg, connecting piece, inter-frame tie rod, and backing material. Among them: 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 type is all curved, and there is only one radius of curvature; the third is all curved, but there are two Radius of curvature. The base is welded under the column legs, and the size of the base depends on the hardness of the bottom plate.The top beam is arc-shaped, and its number is divided into 1 section and multiple sections depending on the size of the tunnel section, the stress of the support, and the transportation conditions. The steel arch bracket connecting piece is a clamping device between the bracket section and the section, which can play the role of connection between the sections, and can also compress the part of the connected two section steel joints to provide a pretension force, so that there is friction between the U-shaped steel In order to ensure that the arch support has a certain working resistance and a certain amount of shrinkage.
As a passive support, the steel arch support has good mechanical properties, high tensile strength and compressive strength compared with the miner steel support, and also has good toughness performance, high initial support force, and large support strength. Steel arch support can be used many times. Steel arch supports are widely used in mine roadways, especially in deep complex roadways and soft coal roadways. Steel arch supports are an effective and reasonable form of support.
