Embedded type dual-liquid grouting device achieving synchronization of shield tail of shield machine

Abstract

The invention discloses an embedded type dual-liquid grouting device achieving synchronization of the shield tail of a shield machine. The embedded type dual-liquid grouting device comprises a first valve block, a second valve block and a shield body connection block, wherein the first valve block, the second valve block and the shield body connection block are embedded in the shield tail, a liquid A channel, a liquid B channel, a piston channel and a water channel are arranged in the first valve block and the second valve block respectively and correspondingly, a piston rod is arranged in the piston channel, a piston is arranged in a piston cylinder, and the piston rod is driven by a pushing cylinder; the part of the liquid A channel and a liquid B socket, located in the first valve block, are communicated with the piston cylinder through a first communication channel, and the part, located in the first valve block, of the water channel is communicated with the piston cylinder through a second communication channel. According to the embedded type dual-liquid grouting device, the position of the piston is controlled through the pushing cylinder, so that an overexcavation gap formed between a duct piece and a tunnel stratum after the shield tail is separated from the duct piece in a shield pushing process is made up rapidly, water seepage of a duct piece joint and a tail gap is effectively prevented, and ground surface settlement is restrained; the embedded type dual-liquid grouting device is applicable to various types of geology, easy to operate, not prone to blocking, and capable of improving construction efficiency.

Description

technical field [0001] The invention relates to a grouting device, in particular to a shield tail synchronous embedded double-fluid grouting device of a shield machine. Background technique [0002] At present, with a large number of subway constructions at home and abroad, tunnel shield excavation has gradually become the main means of urban underground construction by virtue of its own advantages. During the shield propulsion process, when the tail of the shield is separated from the segment, because the diameter of the excavation surface of the cutter head is larger than the outer diameter of the segment, there will be a gap between the segment and the tunnel stratum. If the gap is not backfilled in time, it will inevitably cause Stratigraphic changes, which in turn can have destructive effects on adjacent subsurface structures. Synchronous grouting is usually used on existing shield machines to suppress formation settlement and prevent water seepage at segment joints an...

AI Technical Summary

Problems solved by technology

The external double-liquid grouting device is only suitable for soft soil and not suitable for other geology because it protrudes from the shield and is prone to jamming; the double-liquid grouting device inserts the B liquid pipe into the A liquid pipe and mixes the grout The operation is complicated, the liquid pipe is prone to blockage, and the actual use effect is not good

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