土压平衡盾构机在富水砂层施工中的工艺改造

On the Process Improvement for the Soil Pressure-Balanced Shield in the Construction in the Rich-Watered Sandy Stratum

土压平衡盾构机在富水砂层中施工容易出现土仓压力难以建立、螺旋机喷涌、地表沉降难以控制等问题。为充分利用现有土压平衡盾构机,结合广州轨道交通工程掘进距离长、全断面富水砂层中施工的特点,对盾构机刀盘、螺旋机、渣土改良系统等部位进行针对性改造。实践表明,改造后的土压平衡盾构机能够高效的完成富水砂层中的施工任务,可为同类工程的盾构机改造提供参考。

When the soil-pressure-balanced shield is applied to the construction in a rich-watered sandy stratum, such problems as the difficulty in establishing the soil pressure, the spewing of the screw conveyor, the difficulty in controlling the ground set-tlement and the like tend to happen. In order to make full use of the present soil-pressure-balanced shields, and with the characteristics of the Guangzhou Rail Transit Project being long in tunneling length and the construction being performed in a full-cross-section rich-watered sandy stratum taken into account, the cutter head, the screw conveyor, the sediment-improving system and some other parts of the shield are correspondingly innovated. Practice shows that the improved soil-pressure-balanced shield can efficiently carry out construction tasks in rich-watered sandy strata after the corresponding process improvement. The process improvement in this project may serve as a useful reference for the technical improvement of the shields for other projects of the same type.