Tunnel supporting structure

The utility model discloses a tunnel supporting structure which comprises a supporting frame, and the supporting frame is installed in a tunnel through a fixing piece and supports the tunnel. The fixing piece comprises an installation sleeve and a connecting rod, one end of the installation sleeve is fixedly installed on the side wall, opposite to the tunnel wall, of the supporting frame, the connecting rod is arranged in the installation sleeve in a penetrating mode, one end of the connecting rod extends into the supporting frame, and the other end of the connecting rod extends out of the supporting frame. And a connecting sleeve is screwed on the outer end head of the connecting rod, and is connected with the mounting sleeve through a connecting plate. According to the device, one end of the fixing piece extends into the surrounding rock layer on the inner wall of the tunnel, then the connecting rod is rotated, so that the connecting sleeve at the head of the connecting rod drives the ends of one ends of th