| 摘要 |
<p>PURPOSE:To provide an instrument for measuring hardness of ground which can improve the execution efficiency of construction work by accurately detecting the hardness of ground during drilling work. CONSTITUTION:A drilling torque detector 9 detects the driving load of a driving load device and a rotating speed detector 10 detects the rotating speed of the device. In addition, a depth detector 11 detects the drilling depth and a microcomputer unit 13 calculates the hardness index which correlates to the hardness of ground by using the values detected by the detectors 9, 10, and 11 and displays the calculated index through a meter 15 of printer 17.</p> |
