| 摘要 |
PURPOSE:To exactly grasp the relative position of a head and a grout liquid by a method in which the height of a grout liquid, determined on the basis of integrated amounts of the grout liquid, and the height of the excavator blade measured are displayed on a displayer, and while watching the displayer, the drawing of the excavator blade is regulated. CONSTITUTION:A pile pit 3 is excavated by an earth auger 1, and after that completion of the excavation, cement mortar 2 is injected through the holes of the rotary shaft of the auger 1 while drawing the auger 1. In this case, the integrated flows rates of the mortar, sent from the pulse generator 15 of a flow meter 14a provided on the way of the pipe to a counter circuit 16 and counted there, is divided by a pile cross section determined by a preset excavation diameter and the permeation coefficient of grout liquid into the ground to calculate the height of injection. The injection height so calculated is displayed along with the height of the head 1a measured by a depth meter on a meter board 19. Accordingly, the drawing speed of the excavator blade 1a is regulated so that the movements of both pointers 19a and 19b becomes equalized. |
