| 摘要 |
PURPOSE:To freely perform excavation and grout injection while measuring the electric resistance of the ground by a method in which a swivel for multiple tube, a rotary rod for connection, and a rotary rod for connection with electrode are connected with each other, and a drill edge and a grout monitor are provided at the tip thereof. CONSTITUTION:While turning a tube for excavation, electric current is flowed from an external power source to the terminal of the swivel head each time a given depth is reached to measure the electric resistance of untreated ground, and chemical grout is injected. The chemical grout is injected while turning the rod, and when the injection of chemical grout is discontinued on the way of the injection work, the inner and outer nozzles 37 and 38 are soon closed by recovery force of a rubber valve. Since the chemical grout is not hardened thereby, the injection of chemical grout can be made any time without causing any trouble in the vertical slide action of the piston. |
