The amount confluence public enclosure which from the aforementioned main track tunnel possessed with

摘要

PROBLEM TO BE SOLVED: To provide a method of arranging temporary timbering members 12, 13 which are arranged for stably supporting lining bodies in the process of tunnel construction, to provide a method of economically constructing a tunnel skeleton 80 at a confluent/divergent section 3 having a relatively thin structure while paying attention to sliding of a divergent tunnel 2 caused by an influence of ground-water pressure, and to improve the working efficiency of the tunnel construction.;SOLUTION: The tunnel at the confluent/divergent section 3 at which a divergent tunnel 2 diverges from a main tunnel 1, has earth retaining members 6, 7 extending from the main tunnel 1 to be arranged on upper and lower portions of the divergent tunnel 2, first reinforcing members 10, 12, 14a for reinforcing a lining body of the main tunnel 1, second reinforcing members 13, 14b for reinforcing a lining body of the divergent tunnel 2, and third reinforcing members 11, 15 for supporting the earth retaining members 6, 7. Then concrete is poured onto the inside of an outer shell 70 of the confluent/divergent section 3 to embed the reinforcing members, and the tunnel skeleton 80 at the confluent/divergent section 3 is constructed, to thereby form a divergent space 100 inside the tunnel skeleton 80 at the confluent/divergent section 3.;COPYRIGHT: (C)2006,JPO&NCIPI