GROUND PROPERTY TESTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a ground property testing device which can measure displacement amount of ground displaced by loading directly on a ground surface reached by drilling, with high accuracy, without necessity of installing a pile on a pile hole.

SOLUTION: The ground property testing device comprises: a first jack 10A including a pressure chamber 17 whose capacity changes according to an amount of filled liquid and a piston ring 12 which moves according to the capacity inside the pressure chamber 17; a second jack 10B having the same configuration as the first jack 10A; a liquid path 16 for making the both pressure chambers 17 communicating with each other; a hydraulic pump 20 for applying pressure (load) on the first jack 10A or the second jack 10B; a displacement meter 30 for measuring an amount of displacement of a piston part of the second jack 10B; and a hardness acquisition part for acquiring hardness of ground based on the relation between load quantity applied by the hydraulic pump 20 and the displacement amount measured by the displacement meter 30. And the first jack 10A is provided at a tip in a drilling direction of a drilling head 100.

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