U steel arch structure:

1.      Top beam. The top beam is arch-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.

2.      Column leg. There are three types of legs, one is a circular arc at the top and the straight segment at the bottom; the second is all curved and has only one radius of curvature; the third type is all curved, but has two radii of curvature. The base of the column is welded with a base, the size of the base depends on the hardness of the bottom plate.

3.      Connector. The connecting piece is a clamping device between the bracket section and the inter-section, which can be used for the connection between the joints, it is also possible to press the two sections of the connected steel joints to provide a pre-tightening force to provide friction between the u-shaped steels, thereby ensuring that the arched bracket has a certain working resistance and a certain amount of contraction.

4.      Rack bar. The role of the inter-rack rod is to enhance the overall relative stability of the bracket, and the brackets are coupled from the longitudinal direction to form a whole.

5.      Backing material. The backing material is a filling materila between the u-shaped steel bracket and the surrouding rock, the purpose is to make the u-shaped steel bracket close to the surrounding rock, improve the stress state of the bracket, improve its bearing capacity and maintain the stability of the surrounding rock.

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