Technique for establishing at least a portion of an underground

Details Technique for establishing at least a portion of an underground Technique for establishing at least a portion of an underground

1996-03-14

1997-12-16

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

G01V 311

Patent

active

056989814

ABSTRACT:
A method of establishing the location of at least a portion of a particular path taken by a boring tool within a given region is presented. The method includes the steps of establishing a reference path within the region and providing a portable locator and means located partially at and forming part of the boring tool and partially at and forming part of the locator for generating certain information about the position of the boring tool relative to the position of the locator. When the boring tool reaches various spaced apart measuring locations as it moves along the particular path, at each such measuring location, the locator is positioned on the reference path at an associated reference point which is specifically determined by the position of the boring tool at the associated location on the particular path. With the locator positioned at each of these reference points, positional information of the boring at the associated location on the particular path is generated and recorded and, from this recorded information, an actual path taken by the boring tool is established, which actual path corresponds generally to at least a portion of the particular path taken by the boring tool.

REFERENCES:
patent: 4806869 (1989-02-01), Chau et al.
patent: 4972703 (1990-11-01), Ho
patent: 5155442 (1992-10-01), Mercer
patent: 5337002 (1994-08-01), Mercer
patent: 5444382 (1995-08-01), Mercer
patent: 5585726 (1996-12-01), Chau

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