Title:
FALL-OF-ROCKS DISASTER PREVENTION DEVICE FOR TUNNEL WORKING FACE
Document Type and Number:
Japanese Patent JP2012026201
Kind Code:
A
Abstract:
To provide a fall-of-rocks disaster prevention device capable of efficiently guarding an operator on a working face with a simple structure.
A fall-of-rocks disaster prevention device comprises at least two wires and a mat-like impact absorber having a plane area larger than a projection area of an operator.
Inventors:
KOBAYASHI MASAHIKO
Application Number:
JP2010167199A
Publication Date:
February 09, 2012
Filing Date:
July 26, 2010
Export Citation:
Assignee:
TOKO:KK
International Classes:
E21D9/00; E21C35/04; E21F11/00; E21B12/00
Domestic Patent References:
| JPH1053905A | 1998-02-24 | |||
| JPH1136109A | 1999-02-09 | |||
| JP2010106493A | 2010-05-13 | |||
| JP2007113201A | 2007-05-10 | |||
| JPH11210398A | 1999-08-03 | |||
| JPH09276425A | 1997-10-28 |
Attorney, Agent or Firm:
Sakuo Yamaguchi