Relay pump station and construction method for deep-well separate launching of hydraulic system of shield machine

The invention belongs to the technical field of shield machine construction. The relay pump station for deep-well separate launching of the hydraulic system of the shield machine comprises a valve group connected between a shield machine main machine and shield machine back-up equipment, and the valve group includes a first port connected to the shield machine back-up equipment and a second port connected to the shield machine main machine; a constant delivery pump is disposed between an oil tank and the first port, and the oil tank and the second port are connected via an oil return pipeline;an electric control assembly controls the action of the constant delivery pump according to the level of the oil tank. The invention also discloses a construction method for deep-well separate launching of the hydraulic system of the shield machine. The invention can provide the hydraulic system with an auxiliary function. When the pressure of a main driving motor is too high, the generated drainoil flows into the oil ta