Title:
MULTI-SHAFT DRILLING DEVICE
Document Type and Number:
Japanese Patent JP2021055380
Kind Code:
A
Abstract:
To solve the problem in which conventionally, a drilling shaft is supported by a sliding contact body that slides into a wall surface of a drilling hole regardless of the ground properties at a work site, so that the drilling hole in the sliding contact portion of the sliding contact body collapses, in addition, only a part of a plurality of drilling shafts is supported by a sliding contact body, and the load applied to the plurality of drilling shafts cannot be sufficiently supported, and the entire plurality of drilling shafts cannot be prevented from rotating around a drive unit as a fulcrum.SOLUTION: In a multi-shaft drilling device, a plurality of drilling shafts 7 driven and rotated by a drive device 5 mounted to freely move up and down on a leader mast 3 provided on a base machine 2 installed on the ground is provided in parallel with the drive device 5, a pair of outer drilling shafts 7A are provided on both sides of a central intermediate drilling shaft 7B in a group of the plurality of drilling shafts 7. Of the group of the plurality of drilling shafts 7, a pair of outer drilling shafts 7A are configured to have higher rigidity than the intermediate drilling shaft 7B by a rigidity improvement configuration 20.SELECTED DRAWING: Figure 2
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Inventors:
TANAKA YUSUKE
KASHIMA KAZUHIRO
KASHIMA KAZUHIRO
Application Number:
JP2019179036A
Publication Date:
April 08, 2021
Filing Date:
September 30, 2019
Export Citation:
Assignee:
SANWA KIZAI CO LTD
International Classes:
E02F5/02
Attorney, Agent or Firm:
Junichiro Shinseki
Chiaki Shinseki
Chiaki Shinseki