The main function of mining supports is to support and protect the roof of the coal mining face, preventing the roof from caving in and the coal wall from sloughing off, thereby ensuring the safe operation of coal mining.

U-shaped steel supports are a passive support method with high tensile and compressive strength, suitable for deep, complex tunnels and soft coal seam tunnels. They are mainly used for secondary support in mine tunnels and in tunneling through mountain tunnels.