Seabed shield slurry viscosity reducer as well as use method and application thereof

Abstract

The invention belongs to the technical field of slurry shield slurry circulation, and discloses a seabed shield slurry viscosity reducer as well as a use method and application thereof. The shield slurry viscosity reducer is prepared from the following components in parts by weight: 0.006 to 0.02 part of aluminum sulfate, 0.005 to 0.015 part of lignosulfonate, 0.0008 to 0.003 part of sodium polyphosphate, 0.005 to 0.02 part of industrial defoaming agent and 0.0008 to 0.002 part of pH (Potential of Hydrogen) regulator. When the shield slurry viscosity reducer is used, the materials are prepared according to the mass of slurry as 1 part. The preparation method comprises the following steps: compounding aluminum sulfate, lignosulfonate, an industrial defoaming agent, a pH regulator and sodium tripolyphosphate according to a certain ratio, adding the mixture into seabed shield slurry with the viscosity of 30-45s measured by a Suzhou funnel viscometer, uniformly mixing, reducing the viscosity by 50-60% after treatment, and enabling the slurry not to stick to a pipe wall. The engineering problems that mud cakes are formed on a cutterhead and a mud conveying pipeline is blocked in shield construction can be effectively solved, and the construction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of mud-water shield mud circulation, and in particular relates to a submarine shield mud viscosity reducer, a use method and an application. Background technique [0002] At present, with the large-scale construction of urban subways, large-scale river-crossing tunnel projects and water diversion projects in my country, the application of mud-water shield tunneling technology is becoming more and more extensive. At present, many urban subway tunnel projects under construction at home and abroad are preparing or are adopting mud-water shield construction method. Slurry shield construction occupies a large market share due to its advantages of high efficiency, safety and economy. Under various complex geological conditions, the rotation rate of the cutter head of the mud-water balance shield and the circulation efficiency of the mud-water system directly restrict the production efficiency of the shield constr...

AI Technical Summary

Problems solved by technology

[0005] (1) The means to solve the above problems in the current construction is mainly to reduce the viscosity and ensure the construction progress by discarding the slurry and adding fresh water to dilute it. This treatment method will not only generate a large amount of waste slurry but also need to re-prepare a sufficient amount of slurry for circulation. High construction cost

[0006] (2) There is wear and tear on the mud separation equipment during long-distance construction. Once the wear is serious, it needs to be replaced in time. Otherwise, the mud recovery effect will be unsatisfactory and the equipment cost will be high.

[0007] (3) At present, the mud-water shield cutter head of the seabed is easy to form mud cake and the mud circulation pipeline is blocked

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