Title:
GROUND DRILLING APPARATUS AND INTERMEDIARY DOUBLE PIPE THEREFOR, AND GROUND DRILLING METHOD USING THOSE
Document Type and Number:
Japanese Patent JP3333930
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a time required for construction by a method wherein flushing water including slime is satisfactorily discharged without regard to the diameter and the full length of an insertion bore with an inexpensive outer casing employed.
SOLUTION: For the ground drilling apparatus, a drilling double pipe C is connected to a rock drill 11 through a connector B that transmits a rotatory power only to an inner rod 13 and a drilling bit 15 arranged at the front side of an outer casing 12 is attached to the inner rod 13. An intermediary double pipe D is constructed of an outer casing 22 and an inner rod 23 for which a polygonal connecting part 23a is formed. With the ground drilling method, an insertion bore is drilled with the inner rod 13 only rotated while the drilling double pipe C is pushed forward, and after that the inner rod 13 only is extracted out of the insertion bore with the outer casing 13 left behind in the insertion bore.
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Inventors:
Kensaku Ichikawa
Application Number:
JP19476498A
Publication Date:
October 15, 2002
Filing Date:
July 09, 1998
Export Citation:
Assignee:
Tobishima Construction Co., Ltd.
International Classes:
E21D20/00; E21B3/00; E21B7/20; E21B10/60; E21B17/04; E21D20/02; (IPC1-7): E21B3/00; E21B7/20; E21B10/60; E21B17/04; E21D20/00; E21D20/02
Domestic Patent References:
| JP5280033A | ||||
| JP9100688A | ||||
| JP2289788A | ||||
| JP9250287A | ||||
| JP650085A | ||||
| JP4112162Y1 | ||||
| JP4504150A |
Attorney, Agent or Firm:
Shinichi Harada