Title:
JACKING PIPE CUSHIONING MATERIAL, AND JACKING PIPE
Document Type and Number:
WIPO Patent Application WO/2011/105342
Kind Code:
A1
Abstract:
Provided is a jacking pipe cushioning material that exhibits a superior stress-dispersion effect and is easy to position. The jacking pipe cushioning material (20) (cushioning material pieces (20a)) is a ring-shaped plate member comprising a first side surface (21) and a second side surface (22), which are disposed so as to be substantially parallel at a prescribed distance (s) from one another, as well as an outer peripheral surface (25) positioned at the outer peripheral edges of both side surfaces. If the diameter (radius of curvature) from the center (L) of the ring to the outer circumferential edge (23) of the first side surface (21) is represented by A, the diameter (radius of curvature) to the outer circumferential edge (24) of the second side surface (22) is represented by B, and the diameter (radius of curvature) to an arbitrary position along the axial direction of the outer circumferential surface (25) is represented by C, then A ≥ B and A > C.
Inventors:
YAMADA HIROHISA (JP)
Application Number:
PCT/JP2011/053756
Publication Date:
September 01, 2011
Filing Date:
February 22, 2011
Export Citation:
Assignee:
SEKISUI PLASTICS (JP)
YAMADA HIROHISA (JP)
YAMADA HIROHISA (JP)
International Classes:
E21D9/06; F16L1/024; F16L57/00
Foreign References:
| JPH11141279A | 1999-05-25 | |||
| JPH0882192A | 1996-03-26 |
Attorney, Agent or Firm:
HIRAKI Yusuke et al. (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
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Claims:
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