Multi-stage slurry separation method for construction of slurry shield machine in fine particle stratum

Abstract

The invention discloses a multi-stage slurry separation method for construction of a slurry shield machine in fine particle stratum. An independent slurry treatment system is used in the multi-stage slurry separation method and comprises a pre-sieving assembly, a primary cyclone assembly, a secondary cyclone assembly, a residue storage yard, two slurry tank assemblies, a centrifugal machine assembly and a press filter assembly, wherein the two slurry tank assemblies are divided into a use group and a standby group and can be mutually switched for use; when slurry which meets demands and carries residue soil is discharged from the slurry shield machine, fine particles with the diameter being 20 mu m or larger are separated and enter the residue storage yard after being treated by the pre-sieving assembly, the primary cyclone assembly and the secondary cyclone assembly, residual slurry enters a slurry tank of the use group to be recycled, the slurry tank of the use group is stopped and a slurry tank of the standby group is started when the specific gravity or viscosity of the slurry of the use group does not meet the construction demands, at the moment, solid particles with the diameter being 20 mu m or smaller and clear water are separated from the slurry of the use group via the centrifugal machine assembly and the press filter assembly, and the clear water is stored for recycling.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a mud multistage separation method for construction of a mud-water shield machine in a fine-grained stratum. Background technique [0002] In the construction of the mud-water shield machine, the mud with suitable specific gravity and viscosity is mainly used to ensure the stability of the face, and the mud is used to carry the dregs. After being treated by the mud-water separation system, the solid dregs and mud are separated, and the separated mud is precipitated. After the pool is settled, it is recycled and reused after adjusting the specific gravity and viscosity of the mud. However, when the geological conditions traversed by the mud-water shield machine are mainly clay, silt, silty clay and other fine-grained strata, the mud-water shield machine often encounters that the amount of solid dregs separated by its mud-water separation system is far less tha...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that a large number of sedimentation tanks need to be built and a large amount of construction cost is required, and the fine particles are suspended in the mud for a long time and it is difficult to settle down.

With the accumulation of time, when all the sedimentation tanks are filled with mud, it will also affect the normal construction of the shield

[0006] 3. If the construction site is small and the capacity of the sedimentation tank is small, the construction needs cannot be met, and the waste slurry needs to be transported out of the construction site for treatment in time, which will not only greatly increase the construction cost, but also cause environmental pollution

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