SEAL DEVICE OF DRILLING HOLE WALL PROTECTIVE PIPE

摘要

PROBLEM TO BE SOLVED: To surely prevent a filler from leaking to the inside of a drilling hole in drilling execution of filling the filler between a hole wall and a protective pipe.

SOLUTION: A seal device includes a cylindrical seal body 24 attached to a lower end of a hole wall protective pipe 20 and extended upwards from the lower end to a prescribed height range along a drilling hole wall, and a sheet 25 arranged on an inner side of the seal body 24 and attached to the lower end of the hole wall protective pipe 20. For the seal body 24, a bottom part between the lower end of the hole wall protective pipe 20 and the hole wall has rigidity against a load of the filler, at least a cylindrical part along the hole wall is divided into multiple parts in a circumferential direction, and respective division parts 27 have elasticity so that they can be closely attached to the hole wall independently.

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