Construction management device null of dynamical pressure dense

摘要

PURPOSE:To automatically measure the amount of settling of hammer by a method in which the moving amount of hammer is detected, the penetrating amount of the hammer is detected, and the settling amount of the hammer is obtained from the difference between the winding amount and the free dropping amount of the hammer. CONSTITUTION:After a hammer 3 is wound up to a drop height, the winding operation is stopped, and the hammer 3 is freely dropped for the first consolidation. The hammer 3 in the settled down state after the second winding and the second free drop is wound up from the ground. The settling amount H is measured from rotation of a drum 1, and the numerical value of drops is automatically determined. The settling amount of the hammer can thus be measured from the winding amount and free dropping amount of the hammer.