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Title:
OPERATION METHOD AND DEVICE OF INITIAL PUSHING DEVICE
Document Type and Number:
Japanese Patent JP3790526
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an operation method and a device of an initial pushing device wherein a push-in operation of an insertion pipe by the initial pushing device is automatically performed.
SOLUTION: Agreement of a position of a front recess section 34a or a rear recess section 34b with an engagement pin 42 is detected by detecting an expansion moving position of a cylinder tube 33 and a moving position of a pushing plate 40. Both functions for making the cylinder tube 33 expand and contract by the same stroke as a distance between the front recess section 34a and the rear recess section 34b, and for inserting the engagement pin 42 into the front recess section 34a or the rear recess section 34b in an insertable manner, are controlled by a program. The insertion pipe supported by a positioning device is automatically thrusted into the ground by replacement movement of the pushing plate 40.


Inventors:
Yuji Sakuma
Takayuki Yoshikawa
Tadaki Ito
Minoru Tanaka
Toshihiko Takanashi
Hidenori Hino
Application Number:
JP2003326463A
Publication Date:
June 28, 2006
Filing Date:
September 18, 2003
Export Citation:
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Assignee:
Ishikawajima Harima Heavy Industries Co., Ltd.
Nippon Telegraph and Telephone Corporation
International Classes:
E21D9/06; (IPC1-7): E21D9/06
Domestic Patent References:
JP5010598U
JP7139289A
JP5064294U
JP200054787A
Attorney, Agent or Firm:
Tsunemitsu Yamada
Seiichi Otsuka