| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a screw point provided with strength characteristics required in each part. SOLUTION: In case of a test performing investigation of soil quality, a screw point 1 is attached to the edge of the rod member 210 of prescribed length, and integrally fitted in the ground together with the rod member 210 by prescribed load and rotation given at need. The screw point 1 has an edge- sharp main body part 2, a female screw 3 is formed on the base end of the main body part 2, and the screw point 1 is screwed so that a non-head screw part 4 protrudes one end. The screw point 1 is connected to the rod member 210 by screwing the female screw 211 of the rod member 210 on the non-head screw point 4.</p> |
