Abstract: In order to improve the waterproof ability of waterproof layer in NATM tunnel and reduce the occurrence of water leakage, a method of indirectly using tunnel measurement orientation technology to improve the laying quality of waterproof boards is introduced. By analyzing the laying and hanging process of waterproof board in tunnel, it is found that the main reason affecting the laying and hanging quality is that waterproof board is easy to bend in the circumferential direction with manual way. In this paper, the positioning principle of the tunnel lining trolley is used to position laser beam; The positioned spotlight accurately projects waterproof gasket points onto the tunnel wall to form a regular and orderly waterproof gasket array; When laying and hanging waterproof boards, referring to the direction of the waterproof gasket array in the circumferential direction, the surface of the laid and hung waterproof boards shall be flat and straight, and the waterproof boards shall be parallel to each other. The lap length of circumferential lap joint shall be uniform, and the weld seam after welding with climbing welding machine shall have high sealing property. This method can solve the problem of poor quality of manual laying and hanging waterproof boards in the tunnel to a certain extent, and can also make up for the deficiencies in the design of professional waterproof trolleys in the tunnel.

Key words: tunnel, waterproof board laying and hanging, gasket layout, waterproof gasket, precise positioning, laser assisted positioning device, error correction, waterproof trolley