Synchronous grouting device and method for downslope-section tunneling of water-rich stratum shield

Abstract

The embodiment of the invention provides a synchronous grouting device and method for downslope-section tunneling of water-rich stratum shield. The synchronous grouting device comprises mud pumps, a slurry mixing device and an air compressor. Two-liquid-type slurry enters the slurry mixing device through the two mud pumps and after fully mixing, the two-liquid-type slurry enters a shield machine pipeline and is input into a duct piece wall for further chemical reaction, and solid congelation with certain strength is formed. The two-liquid-type slurry consists of liquid A and liquid B. The volume ratio of liquid A to liquid B is 10:1, the weight ratio of raw materials of cement to water to mud to retarder in liquid A is 1: 1.2: 0.5: 00.1, and liquid B is water glass with a baume degree of 30. The slurry mixing device can better enable a grouting pump to communicate with the shield machine pipeline to realize two-liquid-type synchronous grouting in the shield tunneling process, at the same time, the air compressor is used for transporting air to ensure the smoothness of the pipeline, and the occurrence of a pipe jam accident is prevented.

Description

technical field [0001] The invention relates to the technical field of shield tunnel construction, in particular to a synchronous grouting device and method for excavation of shield tunnels in downhill sections in water-rich strata. Background technique [0002] The shield machine in the water-rich formation is excavating on the downhill section. Under the action of gravity, the water body will continuously wash away the injected grout on the back of the segment. A large amount of water is lost into the shield tunnel, which causes gushing on the face of the shield machine. In severe cases, it even causes a large amount of water to enter the formed tunnel, which seriously affects the progress of the project. In addition, it is difficult for the synchronous grouting slurry to fill the gap and support the tail of the shield, and the large amount of water and soil loss can easily cause serious deformation or even collapse of the formation. [0003] In the prior art, the synchro...

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Problems solved by technology

[0002] The shield machine in the water-rich formation is excavating on the downhill section. Under the action of gravity, the water body will continuously wash away the injected grout on the back of the segment. A large amount of water is lost into the shield silo, resulting in the gushing phenomenon of the face of the shield machine. In severe cases, it even causes a large amount of water to enter the formed tunnel, which seriously affects the progress of the project.

In addition, synchronous grouting grout is difficult to play the role of filling the shield tail gap and supporting, coupled with a large amount of water and soil loss, it is easy to cause serious deformation or even collapse of the formation

[0003] In the prior art, the synchronous grouting grout in shield tunnel construction mainly adopts single-slurry grout, which is convenient for construction and easy to manage, but the setting time of single-slurry grout is long, the early strength and later strength are low, and the shrinkage rate is relatively low. It is difficult to solve the problem of water inrush and gushing, especially for the downhill section of shield tunneling in water-rich stratum

Although the existing double-fluid slurry has a higher setting time and higher strength than the single-fluid slurry, it has certain defects when directly applied to the synchronous grouting of shield tunneling, such as pipe plugging, poor fluidity, and difficulty in filling the back of the segment with grouting slurry. Gap and other issues

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