Steel support for overlapped tunnels

The invention belongs to the technical field of steel structure design and manufacture in the civil engineering industry, and particularly relates to a steel support for overlapped tunnels. The steel support for the overlapped tunnels is characterized in that the steel support mainly consists of multiple identical support systems and rails; the multiple support systems are parallelly arranged on the rails; each support system is of a round structure, and the lower part of each support system is provided with single-rim wheels which are located on the rails; every two adjacent support systems are fixedly connected through a plurality of connection parts; the lower part of the support system at the outermost side is provided with rail lock catches which are connected with the support system through hydraulic oil cylinders which are horizontally arranged; and the rail lock catches are fixedly locked on the rails. The steel support for the overlapped tunnels has the characteristics of being low in cost, easy for manufacture and disassembly and the like; besides, compared with tunnel support equipment in the prior art, the steel support is advantaged in that a tunnel segment with a larger area can be protected, and especially, the effect for protecting a tunnel segment at the lower part is better.