Title:
DRILLING DEVICE
Document Type and Number:
Japanese Patent JP2023057259
Kind Code:
A
Abstract:
To provide a drilling device with improved drilling efficiency and drilling speed.SOLUTION: A drilling device comprises a rod tube 10 which is rotatable and vertically movable and has a lower stabilizing liquid supply port 11 for ejecting a stabilizing liquid L1 at its lower part, a lower bit 20 provided at the lower end of the rod tube 10 for drilling a drilling hole 100 as the rod tube 10 rotates, a mud lifting pipe 30 having a suction port 31 for sucking muddy water 104 at its lower end, and a stabilizing liquid supply pipe 40 having upper stabilizing liquid supply port 41 for supplying the stabilizing liquid L1 at mouth 101 of the drilling hole 100, and further comprises a diameter expansion bit 50 that is provided above the lower bit 20 and expands the diameter of the excavation hole 100 excavated by the lower bit 20. Since the suction port 31 of the mud lifting pipe 30 is positioned above the diameter expansion bit 50, the drilling capacity is improved, and the drilling efficiency and drilling speed are improved.SELECTED DRAWING: Figure 1
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Inventors:
YOSHIKAWA TADASHI
HASHIDATE KENJI
KANDA MASAYUKI
SANAGAWA TAISUKE
TAJIMA SHINICHI
IDE YUSUKE
FUJIMOTO TATSUKI
SEKIYA JUNICHI
HASHIDATE KENJI
KANDA MASAYUKI
SANAGAWA TAISUKE
TAJIMA SHINICHI
IDE YUSUKE
FUJIMOTO TATSUKI
SEKIYA JUNICHI
Application Number:
JP2021166674A
Publication Date:
April 21, 2023
Filing Date:
October 11, 2021
Export Citation:
Assignee:
ADVANCED CONSTRUCTION TECH CENTER
RAILWAY TECHNICAL RES INST
KAJIMA CORP
CHEMICAL GROUT CO
RAILWAY TECHNICAL RES INST
KAJIMA CORP
CHEMICAL GROUT CO
International Classes:
E21B7/00; E21B10/60; E21B21/00
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Hiroshi Kondo
Arata Ohno
Yoshiki Kuroki
Hiroshi Kondo
Arata Ohno