| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a structure for preventing subsidence of a shield machine, which can prevent the subsidence of the shield machine when the shield machine is propelled. SOLUTION: A tunnel 4, which is to be bored by the shield machine 3 starting from the ground and reaching the ground, includes a down approach section 7 which has a down-grade for reaching a predetermined depth from a ground starting section 5, a tunnel section 8 which is constructed at the predetermined depth, and an up-approach section 9 which has an up-grade for reaching a ground arrival section 6 from a terminal end of the tunnel section 8. Improved bodies 1 undergoing soil improvement are provided in the lower sections and peripheries of excavation-planned areas 10, which are to be excavated by the shield machine 3, of both the approach sections 7 and 9, respectively. COPYRIGHT: (C)2010,JPO&INPIT |
