Research on the Renovation Technology of Air Cushion Chamber Suction of the Large Diameter Slurry Balance Shield
Super-large diameter slurry shield of Guangzhou Haizhuwan tunnel crosses the muddy siltstone composite formation.The accumulation of slag in front of cutter and sealing chamber head cause the deterioration of driving pa-rameters,serious tool wear,limited driving efficiency and mud cake formation of cutter head opening.Aiming at the problem of hysteresis in the composite formation of the large diameter slurry balance shield,the P2.1 pump dis-charge suction is proposed to move to the rear of the mud door to increase the suction force of the discharge suction and enhance the slurry fluidity and slag carrying capacity.At the same time,double pipeline hydraulic gate valve quarrying box is installed in front of P2.1 pump so that large particle size residue can be treated.After the transfor-mation of the suction port,the driving efficiency has been improved,which has a certain effect on improving the de-layed discharge.However,due to the jaw crusher not in operation,when the stratum rock mass of the excavation section is broken and the joint fissure is developed,it is easy to accumulate residual soil at the suction port,sud-denly reduce the pressure of the P2.1 pump suction port and the flow rate,increase the extrusion pressure and fluc-tuate the pressure of the incision,etc.,which requires frequent reverse flushing and cleaning of the quarry box thus affecting the normal excavation circulation.Eventually,the suction and jaw crusher function are forced to restore.The relevant research results can provide reference for similar projects.
slurry balance shieldair cushion chamberrenovation of the suction of the slurry pumpquarry box
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