| 摘要 |
<p>PURPOSE:To provide the method and the apparatus for measurement of the shape of the inside shape of an underground hole which can be measured while it is being excavated. CONSTITUTION:Range fibers 9f, 9r are attached to the front end part and the rear end part by keeping an interval (a) on an excavator 3 equipped with a clinometer 7. A first known cross section P1 in an underground hole 1 is made to be opposed to the read-end-part range finder 9r on the excavator 3, the position of the rear-end-part range finder 9r with reference to the first cross section P1 is measured, and the position of the front-end-part range finder 9f with reference to the first cross section P1 is found on the basis of a measured result, the output of the clinometer 7 and the interval (a). The position with reference to the front- end-part range finder 9f of a second cross section P2 in the underground hole 1 facing the front-end-part range finder 9f is measured, and the position of the second cross section P2 regarding the first cross section P1 is found. The excavator 3 is advanced by the interval (a), the rear-end-part range finder 9f is made to be opposed to the second cross section P1 in the underground hole 1, and it is used as a new first cross section. A cycle to find, by the measurement, the position of a new second cross section facing the front-end-part range finder 9f after an advance with reference to the new first cross section is repeated, and the shape of the inner face 10 of the underground hole 1 is measured.</p> |
