Tunnel gas-liquid linkage balance pressure-limiting drainage device

The invention relates to a tunnel gas-liquid linkage balance pressure-limiting drainage device, belongs to the field of tunnel drainage, and solves the problems that a spring type pressure-limiting drainage device in the prior art is low in sensitivity, inconvenient to maintain, difficult to replace and the like. The invention discloses a tunnel gas-liquid linkage balance pressure-limiting drainage device which comprises a rubber ball, a balance rod, a rotating shaft and a first air bag. The rotating shaft is fixedly mounted in the inspection well; a first longitudinal drain pipe and a second longitudinal drain pipe are arranged in the inspection well; a balance rod is rotationally mounted on the rotating shaft; a rubber ball is arranged at one end of the balance rod and used for blocking the first longitudinal drainage pipe. The other end of the balance rod is fixedly connected with a piston in the first air bag. The tunnel gas-liquid linkage balance pressure-limiting drainage device is easy to operate, high