What Are The Construction Functions And Application Characteristics Of Steel Support

In the early stage, it can be used as a common steel support, and timely support the surrounding rock. In the later stage, it can form reinforced concrete by spraying or shotcreting, and make full use of steel.

Features of steel support: high strength, easy installation, and conducive to the safety of initial construction. However, because the U-steel frame joints are nested up and down, rather than flange butt joints, when the surrounding rock deformation is large and the load on the support structure is too large, the U-steel support will produce a certain shrinkage deformation, thus reducing the pressure on the steel support, ensuring that the steel support will not be crushed, and maintaining the stability of the surrounding rock with greater support capacity. The U-shaped steel is also compressible. Steel tube support is usually used to reinforce the surrounding rock in the local poor geological area of the tunnel. The diameter of the steel pipe is about 10cm, and the cold bending sand filling method is often used on site. During construction, butt welding shall be carried out by division of labor, and grouting holes and ventilation holes shall be left at the bottom of the frame and the vault. After installation, the mortar shall be poured into the pipe from the grouting hole at the bottom of the frame by the grouting pump until the ventilation hole at the vault is grouted. The characteristic of steel pipe is that the mechanical properties of steel pipe are symmetrical, and the bearing capacity of steel pipe support is greatly improved by later grouting.