| 摘要 |
PROBLEM TO BE SOLVED: To provide a penetration test method for detecting a load applied to a screw point and a rotational load torque during a rotation by considering a circumferential friction of a rod. SOLUTION: A plurality of the loads are applied to the penetration rod 4 in units of a predetermined depth to detect each load Wa and the corresponding rotational load torque Ta, and the circumferential friction of the rod 4a is calculated from the load Wa and the rotational load torque Ta based on a torque Trm when the penetration rod 4 is pulled up and rotated in the predetermined depth, and excluded to calculate the load W applied to the screw point 4b and the rotational load torque T. COPYRIGHT: (C)2010,JPO&INPIT
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