| 摘要 |
<p>PURPOSE:To obtain a method and an apparatus for highly precisely measuring a position of an underground structure non-destructively. CONSTITUTION:A target head 10 is fixed to a predetermined portion on a top surface of a structure 1 to be buried underground. A measuring hole 6 is drilled by a drill 4 from a known position P on a ground level 3 to the target head 10 on the structure 1 which has been buried. Approach sensing elements 11 comprising a plurality of approach sensing elements 12 arranged in a constant manner are hung by the measuring hole 6 from the known position P to the target head 10 substantially horizontally. By detecting a position of the element 12 by an output from the approach sensing element 12 in the approach sensing elements 11 which approached the target head 10, a coordinate of the target head 10 is determined, and the position of the underground structure 1 is determined by the coordinate.</p> |
