UNDERSEA TUNNEL CONSTRUCTION METHOD AND LAND TUNNEL CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an undersea tunnel construction method or the like, capable of efficiently constructing an undersea tunnel.SOLUTION: A tunnel element 7 is assembled in a fabrication yard 39 which has a gate 35 to enable the fabrication yard 39 to function as a dry dock. After the tunnel element 7 is assembled, the gate 35 is opened to fill the fabrication yard 39 with seawater. Then, the tunnel element 7 floating on the seawater is towed into the sea side by a tow. That is, the tunnel element 7 is towed on the sea from the fabrication yard 39 to an immersion place. The tunnel element 7 towed to the sea is towed on the sea to the immersion place. After the tunnel element 7 is towed to the immersion place, the tunnel element 7 is immersed. Thus, the tunnel element 7 can be immersed to a desired position on a bottom of the sea 11a.SELECTED DRAWING: Figure 7