| 摘要 |
PURPOSE:To reduce energy required for the improvement work of the ground as well as to cut down the cost of the work by a method in which a drain material and a coagulant are charged into the central part of an excavated hole through a supply pipe penetrated to a givened depth, and while agitating the coagulant, the supply pipe is pulled up. CONSTITUTION:Preexcavation for a supply pipe 3 is made by means of the stirring blade 4a of a rotary shaft 4 turned, and the device 1 is pressed to penetrate the pipe 3 to a given depth. Broken stones are charged from a hopper 5, the pipe 3 is filled with a drain material, and lime or cement is supplied from a coagulant-supplying pipe 6. When the device 1 is pulled out while turning the blade 4a, lime, etc., is discharged from the lower end of the pipe 6 and agitated in soft ground by the blade 4a, and also broken stones are discharged from the lower end of the pipe 3. Furthermore, the agitation of the coagulant and the discharge of broken stones are made while pulling out the device 1 to form compacted area B around the drain A. |
