| 摘要 |
PROBLEM TO BE SOLVED: To provide a connecting structure for a tunnel cutting and enlarging section capable of being connected with high strength and being easily carried out by absorbing a three-dimensional execution error even if there is the three-dimensional execution error in a parallel tunnel. SOLUTION: A supporting is provided on the upper part between underground tunnels 1 and 1 parallel at an interval, a segment 5 of both tunnels is partially dismantled to remove, and in the connecting structure of the tunnel cutting and enlarging section constructed by a cutting and enlarging method for constructing an underground space having a large section by excavating earth and sand between both tunnels, an inner insertion pipe 10 having a shear key 10a on the outer circumferential surface is mounted to the end section of the segment 5, a shear key 11a on the inner circumferential surface at the end of a joint structure 4 arranged on between both tunnels 1, 1, a sleeve pipe 11 wherein the inner insertion pipe 10 can be inserted is provided, and the inner insertion pipe 10 is inserted in the sleeve pipe 11 to connect them so as to enable the execution error to absorb by a grout joining means 8 formed by filling a gap between the inner insertion pipe 10 and the sleeve pipe 11 with a grout 12. COPYRIGHT: (C)2004,JPO |
