Title:
HEADER PIPE PRESENT DIRECTION SEARCHING METHOD AND EXCAVATOR FOR CONNECTING PIPELINE HOLE
Document Type and Number:
Japanese Patent JP3580442
Kind Code:
B2
Abstract:
PURPOSE: To provide a method for searching the present direction of a laid header pipe for accurately connecting to the laid pipe without open-cutting and an excavator for the pipeline hole connected to the pipe.
CONSTITUTION: The method for searching a header pipe present direction comprises the steps of arranging a plurality of elastic wave receiving sensors S1, S2, S3 and S4 for detecting the elastic waves arriving at the pipe 10 laid under the ground at a plurality of predetermined angle positions θ1,... on the inner surface of the pipe 10 in the plane for crossing the pipe 10, oscillating the wave from the predetermined position on the ground surface or under the ground, and searching the direction of the pipe 10 to the center O from the predetermined position P1 based on the time of detecting the waves by the plurality of the sensors S1 to S4 arranged on the surface of the pipe 10.
Inventors:
Hiroshi Takagi
Kato scribe
Kato scribe
Application Number:
JP11377195A
Publication Date:
October 20, 2004
Filing Date:
April 14, 1995
Export Citation:
Assignee:
Mitsubishi Precision Co., Ltd.
Measurement Research Consultant Co., Ltd.
Measurement Research Consultant Co., Ltd.
International Classes:
E21B7/06; G01C7/06; G01C15/00; (IPC1-7): G01C15/00; E21B7/06
Domestic Patent References:
| JP62135714A | ||||
| JP3072195A | ||||
| JP60201207A | ||||
| JP64044874A | ||||
| JP56076066A |
Attorney, Agent or Firm:
Toshiro Ochi