WATER SURFACE DISPLAY METHOD AND MEASURING METHOD OF UNDERWATER STRUCTURE POSITION

PROBLEM TO BE SOLVED: To measure the position of an underwater structure accurately and easily by a simple structure and reduce the cost of measurement. SOLUTION: Measurement points P1 and P2 are set on the underwater structure 1. Lower ends 12a of connecting rods 12 having the same lengths are connected to at least four different points which are spaced apart from the measurement points by the same distances while upper ends 12b of the connecting rods 12 are connected to buoyancy bodies 11 positioned underwater above the underwater structure 1. These connecting rods 12 are tensed by the buoyancy of the buoyancy bodies 11. Display posts 13 are fixed to connecting plates of the buoyancy bodies 11 so that they protrude from the water surface. The position of the underwater structure 1 is displayed by water surfaces of the display posts 13, and predetermined points of the water surfaces of the display posts 13 are measured by a surveying instrument, thereby measuring the position of the underwater structure 1. COPYRIGHT: (C)2010,JPO&INPIT