| 摘要 |
PURPOSE:To improve the ground economically without deformation of the ground by a method in which each discharge unit amount of a chemical grout to be injected from the first and second injection ports of a three-way injection tube is controlled to less than a specific amount/hr, and each injection time is controlled to a specific time while alternately injecting the chemical grout. CONSTITUTION:A three-way injection tube 1 has an excavating water jet port 58 on its tip, the second injection port 20 on its tip side, and the first injection port 18 on its base side. The liquids A and B of a quick-setting chemical grout GS are independently introduced into the tube 1, mixed, and then injected through the first injection port 18 into the ground. The liquids C and D of a slow-setting chemical grout GL are joined in a swivel and injected from the second injection port 20. The unit amounts of the grouts GS and GL to be injected are controlled to less than 12l/min, the injection time is controlled to 0.1-10sec, the injection of the grouts GS and GL is alternately made. The deformation of the ground and leakage of chemical grouts can thus be prevented, and the ground can be improved with lesser amounts of chemical grouts. |
