Method normalizing weight free fall underwater riprap foundation

摘要

PROBLEM TO BE SOLVED: To easily and accurately carry out a predetermined leveling work by determining the remaining reveling value directly and easily by a level measuring worker and visually measuring the reduced value of crown height after each free falling of the weight by a crane operator.;SOLUTION: A remaining leveling scale c and a suspended and lowered scale d are indicated on the weight support b; the former is the scale indicating the total length of the planned crown height of underwater rubble base, that is, the depth D from sea level datum, ground height H at a point of a level installed, and a level machine height h, which are measured from the bottom surface 7 of the weight head a and, using a virtual base line 10 obtained at the required region of the weight support b as a start point 0, and increases the value of the scale downward; and the latter measures the planned crown height of the underwater rubble base, that is, a length same as the depth D from the sea level datum from the bottom surface 7 of the weight head a, and the values of scale increase upward and downward from a virtual base line 13 as the start point 0 obtained at the required region of the weight support b.;COPYRIGHT: (C)2002,JPO