Title:
SELF-DRILLING ROCK BOLT AND CONSTRUCTION METHOD THEREOF
Document Type and Number:
Japanese Patent JP2020094362
Kind Code:
A
Abstract:
To provide a self-drilling rock bolt capable of preventing a drilling debris from entering the inside of an outer tube, and also securing a required fixing strength of a rock bolt main body by filling a fixing material.SOLUTION: A self-drilling rock bolt 1 according to the present invention includes a hollow rock bolt main body 2 that can be freely connectable to a drilling machine 10, a bit 3 provided at the tip of the rock bolt main body 2, and an outer tube 4 that is mounted on a periphery of an outer side of the rock bolt main body 2, and the rock bolt 1 is provided with a discharging hole 32 of a drilling water formed in the bit 3 and a step surface 34, and the tip of the outer tube 4 is pressed against the step surface 34 so as to be watertight.SELECTED DRAWING: Figure 1
Inventors:
OKUNO MINORU
MUTO HIROYUKI
MUTO HIROYUKI
Application Number:
JP2018231890A
Publication Date:
June 18, 2020
Filing Date:
December 11, 2018
Export Citation:
Assignee:
KFC LTD
International Classes:
E21D20/00
Domestic Patent References:
| JP2005232827A | 2005-09-02 | |||
| JPH06287948A | 1994-10-11 | |||
| JP3878104B2 | 2007-02-07 | |||
| JPH0313699A | 1991-01-22 |
Attorney, Agent or Firm:
Shigeyuki Motoi