| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method of a tunnel forming a width extended part and a joint part of the tunnel inexpensively. SOLUTION: In this construction method of a tunnel, a pilot tunnel is excavated above and below a main tunnel and a branch tunnel, respectively, next a freezing pipe for circulating an antifreezing fluid is inserted into the ground above and below the main tunnel and the branch tunnel from the pilot tunnels, then the pilot tunnel is filled with a filler to freeze the ground above and below the main tunnel and the branch tunnel by circulating the antifreezing fluid in the freezing pipe, next the ground between linings of the main tunnel and the branch tunnel is excavated, the ground on an outer periphery side of segments in parts above and below the main tunnel and the branch tunnel is excavated to form a cavity part, and then a connection member is stretched over between the segments in the parts above and below the main tunnel and the branch tunnel. COPYRIGHT: (C)2011,JPO&INPIT |
