Title:
試錐システム及び試錐方法
Document Type and Number:
Japanese Patent JP6725128
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a drilling system in which enlarged diameter excavation is possible even during regress, and an enlarged diameter unit and a storing pipe can be replaced in the ground.SOLUTION: A drilling system includes water filling pressure control means (50) for controlling the water pressure of circulation water (1), and a cylindrical enlarged diameter unit (80) formed by a water filling port (11) being brought into communication with a cylinder (20) in the rear. The enlarged diameter unit (80) includes a piston (25) being closely fit in the cylinder (20) and being reciprocated, biasing means (4) for applying elastic force in the succeeding direction to the piston (25), rack gears (31, 32) arranged in the inside of the enlarged diameter unit (80) and performing reciprocating operation in conjunction with the piston (25), multiple pinion gears (61, 62) engaged therewith and reversely rotating, and enlarged diameter bits (64, 65) extended in those radial directions (M) and capable of being opened and closed. The water filling pressure control means (50) increases the water pressure to the high-water pressure (HP) being a predetermined value or more, and develops the enlarged diameter bits (64-66).SELECTED DRAWING: Figure 3
Inventors:
Kazunori Hase
Nobuaki Niihara
Kubo Mitsuhiro
Nobuaki Niihara
Kubo Mitsuhiro
Application Number:
JP2016139749A
Publication Date:
July 15, 2020
Filing Date:
July 14, 2016
Export Citation:
Assignee:
Sumiko Resource Development Co., Ltd.
International Classes:
E21B10/64; E21B10/32; E21B25/00
Domestic Patent References:
| JP2003161092A | ||||
| JP2001207771A | ||||
| JP2011190632A | ||||
| JP2011214387A | ||||
| JP10196266A | ||||
| JP10061362A | ||||
| JP2003106081A | ||||
| JP58047893A | ||||
| JP2007070870A | ||||
| JP2000064759A | ||||
| JP59163685U | ||||
| JP2000328864A |
Foreign References:
| US4470470 |
Attorney, Agent or Firm:
Akira Koike
Seiji Iga
Seiji Iga