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七十年代以来我国在地下水位以下顶管时采用封闭工作面、用压力水射流破土、并通过水力吸泥机将泥浆运到工作坑外的方的法,通常将这种水力挖掘和水力运输的顶进方法称为水射顶管。这种顶管方法主要用于压力管穿越河流。水射项管已然成为一种顶管方法但设计计算尚不完备,故试用目前的水力计算理论对水力挖掘和水力运输进行计算,以期为设计射流破土的喷嘴、和水力输出的水力吸泥机的参考,并作为选用水泵时的计算依据。
Since the 1970s, China adopted the method of closing the work surface with a closed work surface, using pressure water jets to break the earth, and transporting the mud to the outside of the work pit through a hydraulic suction dredge. This type of hydraulic excavation and hydraulic transport is commonly used. The jacking method is called a water ejector tube. This jacking method is mainly used for pressure pipes crossing rivers. The water project pipe has become a pipe jacking method but the design calculations are not yet complete. Therefore, the current hydraulic calculation theory is used to calculate the hydraulic excavation and hydraulic transportation, in order to design the nozzle for jet breaking and the hydraulic suction machine for hydraulic output. The reference, and as the calculation basis for the selection of the pump.