Title:
EARTHQUAKE-RESISTING PIPE JACKING METHOD AND PIPE JOINT USING EARTHQUAKE-RESISTING PIPE JACKING METHOD
Document Type and Number:
Japanese Patent JP3508128
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the point at issue that aseismicity expanding and contracting in both directions is insufficient in a pipeline pushed in and laid by driving force from a rear.
SOLUTION: The pipe joint in which a ring 3 for transmitting driving force annularly formed by alternately laminating decomposing sheets 31 and water absorbing sheets 32 is interposed between a pushing flange 11 externally faced to the inserting port 1 of a joined-together pipe 10A and the side end face 21 of the opening section of the socket 2 of another pipe 10B, the ring 3 transmits driving force from a rear and the pipeline is formed, the decomposing sheet 31 of the ring 3 for transmitting driving force directly receives hydrolysis and biodegradation action by peripheral environment and loses compressive strength after the completion of pipe jacking, and an extensible annular decomposing layer R is formed to the outer circumferential surface of the joint is used. Biodegrading plastics, particularly a polylactic acid also has high compressive strength and a decomposition reaction is promoted quickly in an alkaline atmosphere as the decomposing sheet, and the water absorption action of the water absorbing sheet such as paper, a nonwoven fabric or the like assists the decomposition action.
Inventors:
Yamamoto, Yoshihiko
Shimoyasu, Tetsuji
Yoshida, Yoshinori
Fujita, Koji
Shimoyasu, Tetsuji
Yoshida, Yoshinori
Fujita, Koji
Application Number:
JP35809299A
Publication Date:
March 22, 2004
Filing Date:
December 16, 1999
Export Citation:
Assignee:
KURIMOTO LTD
International Classes:
E03B7/00; E03F3/04; E21D9/06; F16L1/024; F16L21/02; (IPC1-7): E21D9/06
Attorney, Agent or Firm:
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