Title:
ROCK BOLT
Document Type and Number:
WIPO Patent Application WO/2017/119271
Kind Code:
A1
Abstract:
A rock bolt 1 embedded in a hole 103 provided in natural ground 101 comprises: a movable-side rod body 3 arranged inside the hole 103 and having movable-side extension sections 16, 17, 18 that are elastically deformable; a fixed-side rod body 2 arranged alongside the movable-side rod body 3, inside the hole 103; a cylinder case 22 movably coupling the movable-side rod body 3 to the fixed-side rod body 2; a compression spring 24 that generates a force in an opposite direction A2 to the movement direction A1 when the movable-side rod body 3 moves relative to the fixed-side rod body 2; and a slide-restricting mechanism 23 that restricts the range in which the movable-side rod body 3 can move. The rigidity of the movable-side extension sections 16, 17, 18 in the movable-side rod body 3 is greater than the rigidity of the compression spring 24.
Inventors:
KOIZUMI YU (JP)
YOKOTA YASUHIRO (JP)
IWANO KEITA (JP)
OKADA YUKO (JP)
DATE KENSUKE (JP)
YAMAMOTO TAKUJI (JP)
MASUMOTO KAZUHIKO (JP)
INUZUKA TAKAAKI (JP)
YOKOTA YASUHIRO (JP)
IWANO KEITA (JP)
OKADA YUKO (JP)
DATE KENSUKE (JP)
YAMAMOTO TAKUJI (JP)
MASUMOTO KAZUHIKO (JP)
INUZUKA TAKAAKI (JP)
Application Number:
PCT/JP2016/087760
Publication Date:
July 13, 2017
Filing Date:
December 19, 2016
Export Citation:
Assignee:
KAJIMA CORP (JP)
International Classes:
E21D20/00
Foreign References:
| JP2010507032A | 2010-03-04 | |||
| US5882148A | 1999-03-16 | |||
| JPS63185900U | 1988-11-29 | |||
| JP2003184080A | 2003-07-03 | |||
| JP2007177485A | 2007-07-12 | |||
| JP2008513643A | 2008-05-01 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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