Tunnel construction top layer waterproof structure

The utility model discloses a tunnel construction top layer waterproof structure. Waterproof supporting main body plate, an acrylic acid waterproof coating is connected to the outer part of the upperpart of the waterproof support main body plate; top waterproof foam is mounted outside the upper part of the acrylic acid waterproof coating; a first fixing groove is formed in the left side in the waterproof supporting main body plate; a first fixed top block is mounted in the first fixed groove; the bottom end of the central fixed top block is connected with a telescopic fixed base; and a secondfixing groove is formed in the right side of the waterproof supporting main body plate, a second fixing top block is installed at the bottom end of the second fixing groove, the bottom end of the second fixing top block is connected with a telescopic fixing base, a front end connecting plate is installed outside the front end of the waterproof supporting main body plate, and a rear end connectingplate is connected outside