LARGE DEPTH HYDRAULIC TESTING METHOD, EXCAVATOR FOR TEST AND PACKER

PROBLEM TO BE SOLVED: To carry out low-cost water sampling by performing large-depth boring excavation without using bentonite muddy water, and grasping correct hydraulic characteristics of ground water in a target large-depth area. SOLUTION: According to an engineering method, while drilling is performed by a drilling bit arranged at the lowermost end part of an excavator to open and close, a casing 11 is inserted in a bored hole, the drilling bit 3 is removed from the casing 11, a cutter is inserted in the casing 11 to cut the casing 11, a packer is arranged in the position of the cut casing, and two packers are fixed to upper and lower sides of the bored hole in the position of height. An outer tube 1 inserted in the casing 11 includes a wing bit 8 capable of freely opening and closing, and the packer inner tube includes a packer rubber and the outer peripheral conical cam.