| 摘要 |
PURPOSE:To enable a position to be automatically measured with a high accuracy and increase inspecting and operating efficiencies by providing a reference truck and trackless working truck with an acoustic transmitter and receiver and an optical range finder both having directivity. CONSTITUTION:An acoustic transmitter 23, acoustic receivers 24 and 34 and an optical range finder (a laser range finder 35, a reflecting prism 25 and the like) are carried on a reference truck 20 that self-propels along the weld seams 41a and 41b of a structure while measuring a moving distance and a railless work truck 30 that operates while self-propelling around the reference truck 20 so as to be able to conduct scanning. The reference truck 20 is suitably stopped at a reference point, instruments on the trucks 20 and 30 conduct the scanning and a distance between the trucks 20 and 30 is measured by the optical range finder in a turning angle position wherein a received sound intensity is maximum whereby the bearing and the range of the working truck 30 with respect to the reference point can be measured. |
