| 摘要 |
PROBLEM TO BE SOLVED: To prevent a leading end side of a pipe from being deflected downward and deformed, and prevent a friction cut plate from moving along with an underground structure, when jacking the underground structure along an undersurface of the friction cut plate in such a manner as to follow a pipe roof, while jacking the pipe roof, composed of a pipe row where the friction cut plate is placed on a top plate, into the ground under a track. SOLUTION: The friction cut plate 2, the front end of which is fixed to the top surface of the front end of the pipe 4, is placed on each pipe 4 which constitutes the pipe roof. The jacking of the pipe 4 and that of the underground structure 1 are alternately performed while a back end of the friction cut plate 2 is pulled with a constant tensile force by using a hydraulic jack 8a. The tensile force makes the pipe 4 jacked while being held in a horizontal state, and prevents the friction cut plate 2 from moving along with the underground structure 1, when the underground structure 1 is jacked. COPYRIGHT: (C)2008,JPO&INPIT
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