Dredging grab bucket and dredging method

摘要

PROBLEM TO BE SOLVED: To make it possible to drain residual water caused by a shell cover when it is separated from water in a dredging grab bucket in which an object to be grasped is sealed and wound by a shell cover. SOLUTION: In a dredging grab bucket 80 for sealing an object to be gripped by pivotally supporting a pair of left and right shells 100 so as to be openable and closable, and by closely arranging a shell cover 50 having a predetermined capacity on an open upper end portion of the shells. Provided is a dredging grab bucket equipped with a residual water draining mechanism 10 capable of holding in an open state or a closed state in the vicinity of the end portion of the shell cover in the opening direction of the shell. [Selection diagram] FIG. 26