| 摘要 |
PURPOSE:To prevent the lowering of the bearing force of concrete due to the generation of slime by a method in which a slime sensor is integrally provided to the tip of a tremie tube, the presence of settled slime is detected, and then concrete is placed through the tremie tube. CONSTITUTION:A pit is excavated by an excavator in the ground and then a stabilizing liquid 2 is filled in the pit 1 to stabilize the wall of the pit, where slime 3 is settled on the bottom of the pit. An iron bar cage 4 is inserted into the pit 1, a tremie tube 5 having a slime sensor 6 on its tip is penetrated, and when the presence of slime is detected, the harmful slime is removed by an air lift method or a suction pump. After the slime removing operation is finished by using the sensor 6, fresh concrete is placed through the tremie tube 5 for concreting work. |
