Details for the soft ground improvement (砂 杭) composition method and apparatus

摘要

A method and an apparatus to ram the sand with a pile were described. Thus, a pipe is driven into the ground, through which sand is supplied into the ground. A sand compacting device is disposed at the lower end of the pipe for discharging the sand out of the pipe and compacting it. An hydraulic cylinder has a piston for moving the compacting unit vertically. A detector senses the working distance of the piston by detecting the flow rate of fluid supplied to the hydraulic cylinder. The pressure of the fluid is sensed when the downward stroke of the piston has reached a predetermined value. The pushing force applied by the sand compacting unit is sensed and computed based on the fluid pressure of a predetermined value.