Title:
UNDERGROUND LEAD-IN CONSTRUCTION METHOD FOR PIPE
Document Type and Number:
Japanese Patent JP3492027
Kind Code:
B2
Abstract:
PURPOSE: To provide a long distance underground laying process of pipe which can prevent the breakage of a drill pipe, in a construction process to lay a large diameter of pipe while expanding a small diameter of hole.
CONSTITUTION: The processing device is composed of a hole expanding device which furnishes a rotatable device 3, a large diameter hole expansion head 5, its rotation driving device 7, and a skin plate 10 provided to cover the front end periphery of pipes 14 divided at specific lengths slidable, at the rear end of a drill pipe 2 in a small diameter hole, and a lead-in jack device 11 provided at the front end of the pipes 14. Furthermore, at the rear end of the lead-in jack device 11, divided pipes 14 are connected, and they are combined movable by intermediate drawing jack device 15 respectively, and after a hole expansion process to expand the front part of the pipe at a specific length by rotating the hole expansion head 5 while adding a tensile force to the drill pipe 2 is carried out, the lead-in jack device 11 is operated, and then, the intermediate drawing jack devices 15 are operated in order, so as to repeat a pipe lead-in process to draw in the pipe as one stroke without rotating, alternately.
Inventors:
Toshitaka Ono
Nobuo Ohba
Keita Nozaki
Nobuo Ohba
Keita Nozaki
Application Number:
JP15881695A
Publication Date:
February 03, 2004
Filing Date:
June 02, 1995
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
E21D9/06; F16L1/024; (IPC1-7): F16L1/024; E21D9/06
Domestic Patent References:
| JP4528867B2 |
Attorney, Agent or Firm:
Nobuyuki Hayashi (2 others)
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