| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a structure for preventing deformation of ground, which can inexpensively and easily prevent the deformation of the surrounding ground when a 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. Protective barriers 2 for preventing the deformation of the surrounding ground E are provided on both the axial-direction-of-tunnel sides of excavation-planned areas 10 of both the approach sections 7 and 9, respectively. COPYRIGHT: (C)2010,JPO&INPIT |
