| 摘要 |
PURPOSE:To attain a simultaneous measurement for the depth, the hole shape and the muddy water pressure respectively, by hanging down a hole-shaped muddy water pressure gauge having plural arc-shaped elastic members at the circumference part of the center shaft plus a distortion gauge fixed at the upper part of the elastic members into a hole. CONSTITUTION:A muddy water pressure gauge 2 is built into the center part of a center shaft 1, and the measured value is transmitted to a recorder 15 on the ground. A plate spring 4 has an arc form. The upper end part of the spring 4 touches the shaft 1 via a distortion gauge 3, and the lower end part touches slidably the surface of the shaft 1 via a roller 5 attached to the lower end part. A hole-shaped muddy water pressure gauge 9 is hanged down by a cab tire cord 11 drawn out of a drum 10, and a depth measuring device 12 measures the drawn-out distance of the cord 11 to obtain the depth of the hole. Indicators 13 and 14 display the output value sent from the gauge 3 and the measured value sent from the gauge 2 respectively, and at the same time record the numerical value displayed by the recorder 15. As a result, a simultaneous measurement is possible for the depth, the hole shape and the muddy water pressure respectively. |
