LOCK BOLT MADE OF STEEL PIPE - NISSHIN STEEL CO LTD

Title:

LOCK BOLT MADE OF STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2005/047648

Kind Code:

A1

Abstract:

A pressurized fluid injecting sleeve (10) to be mounted on a lock bolt main body (1) is composed of a cylindrical large-diameter projection (11) and a small-diameter washer holder (12), the outer diameter of the washer holder (12) being smaller than the hole diameter of a washer (6). It is desirable that the large-diameter projection (11) and washer holder (12) be equal in inner diameter. With the lock bolt main body (1) embedded in bedrock or ground, the washer (6) is seated on the edge of a lock bolt insertion hole, while the washer holder (12) extends into the lock bolt insertion hole. Therefore, the members projecting from a sprayed concrete layer disposed on the bedrock or ground are only the washer (6) and large-diameter projection (11). The height of projection is restrained, and thereby, the placing of lining concrete can be easily done to make reinforcing work of high reliability possible.

Inventors:

IWASAKI TATSUROU (JP)
NAKATA MASAHIRO (JP)
SHIROMA HIROMICHI (JP)
ITOU TETSUO (JP)
OOSHIMA KENJI (JP)
TANASE HIROYUKI (JP)
NAKAKO TAKEFUMI (JP)
YOSHIDA TAKEYUKI (JP)
KITTAKA TOSHIHARU (JP)

Application Number:

PCT/JP2004/011200

Publication Date:

May 26, 2005

Filing Date:

July 29, 2004

Export Citation:

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Assignee:

NISSHIN STEEL CO LTD (JP)
NISSHIN KOKAN CO LTD (JP)
NAGOYA ROAD ENGINEER CO LTD (JP)
IWASAKI TATSUROU (JP)
NAKATA MASAHIRO (JP)
SHIROMA HIROMICHI (JP)
ITOU TETSUO (JP)
OOSHIMA KENJI (JP)
TANASE HIROYUKI (JP)
NAKAKO TAKEFUMI (JP)
YOSHIDA TAKEYUKI (JP)
KITTAKA TOSHIHARU (JP)

International Classes:

E21D21/00; E21D20/00; (IPC1-7): E21D20/00; C23C2/06

Foreign References:

JP2003206698A	2003-07-25
JPH07189598A	1995-07-28
JPS63185900U	1988-11-29
JPS6443700A	1989-02-15
DE10057041A1	2002-05-23
US4921010A	1990-05-01

Other References: