METHOD FOR CONSTRUCTING TUNNEL HAVING LARGE CROSS SECTION

摘要

PROBLEM TO BE SOLVED: To provide a method for constructing a tunnel having a large cross section in the ground whereby the tunnel can be economically constructed without a limitation such as earth covering. SOLUTION: This method for constructing a tunnel having a large cross section includes the process of constructing the exterior and interior walls of the tunnel from small-bore pipes 1 interconnected by small bore pipe propulsion construction method; the process of digging the ground between the exterior and interior walls of the tunnel; the process of assembling reinforcement into a space A dug into the ground between the exterior and interior walls of the tunnel; the process of placing concrete into the space A between the exterior and interior walls of the tunnel; and the process of digging the ground inside the interior wall of the tunnel after the concrete placed has set.