| 摘要 |
PROBLEM TO BE SOLVED: To provide a rod which is brought into continuous contact with a cone moving up and down while following the vertical motion of the rod, without being corotated even if the rod is rotated for the measurement of torque. SOLUTION: A lower cone 3, which is attached to a leading end 1a of the rod 1 for the dynamic penetration test, is brought into continuous contact with the rod 1 via an upper cone 2 which follows the vertical motion of the rod 1 and which is made free from rotation around the axial center 1d of the rod 1. Preferably, a taper 2b is formed on the upper side of the cone 3. COPYRIGHT: (C)2006,JPO&NCIPI
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