Surface strain gauge suitable for steel arch

The utility model belongs to the technical field of tunnel engineering, and particularly relates to a surface strain gauge suitable for a steel arch, which comprises a strain gauge body and mounting seats positioned at two ends of the strain gauge body, mounting plates are hinged on the mounting seats, adjusting assemblies used for adjusting the angles of the mounting plates are arranged on the mounting seats, and each adjusting assembly comprises an adjusting screw rod. The end, away from the strain gauge body, of the adjusting screw abuts against the mounting plate. According to the utility model, the angle of the mounting plate is adjusted and fixed through the adjusting screw rod, so that the mounting plate can be attached to the arched steel plate as much as possible, thereby adapting to the mounting requirements of arched steel plates with different radians, improving the mounting firmness of the surface strain gauge, and ensuring the accuracy of a monitoring result. 本实用新型属于隧道工程技术领域，具体涉及一种适用于钢拱架的表面应变计，包