Title:
ROCK BOLT AND MANUFACTURING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2022046984
Kind Code:
A
Abstract:
To provide a rock bolt that can eliminate the work of nut removal and re-tightening when performing a pull-out test, can easily perform a pull-out test, and can exhibit high strength and high yield strength over the entire length.SOLUTION: A rock bolt has a neck portion 3 formed on a rear side of a shaft portion 2 in the driving direction so as to project in a flange shape with respect to the shaft portion 2. The tip of the neck portion 3 is provided so as to be able to push a bearing plate 51 externally attached to the shaft portion 2. A head portion 4 is formed on the rear side of the neck portion 3 so that at least a part thereof projects in a flange shape with respect to the neck portion 3.SELECTED DRAWING: Figure 1
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Inventors:
FUKUDA SATOSHI
OMICHI ATSUSHI
OMICHI ATSUSHI
Application Number:
JP2020152660A
Publication Date:
March 24, 2022
Filing Date:
September 11, 2020
Export Citation:
Assignee:
SUNRISE KOGYO KK
KFC LTD
KFC LTD
International Classes:
E21D20/00
Attorney, Agent or Firm:
Shigeyuki Motoi