The Role and Application of Subway Shield Defoaming Agent
Subway shield defoaming agent is a kind of chemical used in shield engineering, Its main role is to control and reduce the foam produced in the process of shield work.
In the shield project, the shield machine is advanced through the underground tunnel, while the soil layer is excavated in the front. In the soil layer, there is often groundwater or aquifer layer, these aquifer will be affected by the pressure and friction exerted by the shield machine, producing a large amount of mixture of cement slurry and air, namely foam.
The existence of foam will bring some problems to the shield engineering. First, the foam will increase the friction between the shield machine and the soil layer, making the propulsion process difficult. Secondly, the foam will also increase the resistance of the shield machine, and have an adverse impact on the propulsion speed of the shield machine. In addition, the foam may also lead to liquefaction and instability of the soil layer around the tunnel, increasing the risk of engineering.
The mechanism of action of the defoaming agent of subway shield tunneling
By reducing the surface tension of mud and water, the subway shield defaming agent quickly destroys the foam structure and reduces the foam volume, thus significantly eliminating the foam. This anti-foam agent is used in the working process of shield machine, which can effectively reduce the shutdown time caused by foam problems and reduce the construction cost.
The Application scenario of subway shield defoaming agent
In the process of shield construction, foam agent will be added in order to reduce the viscosity of the soil and prevent the inner wall of the shield machine and the pressure cabin. This can lead to a large number of bubbles, which can affect the construction schedule and efficiency. Subway shield defoaming agent can quickly eliminate these bubbles and ensure the smooth construction.
The features of subway shield defoaming agent
Fast defaming speed: can quickly destroy the foam structure, reduce the foam volume.
Long foam-suppression time: it can inhibit the production of foam for a long time.
Stable chemical performance: it will not react with soil or other construction materials, and does not affect the construction progress and efficiency.
Application effect of defoaming agent in subway shield tunneling
Reasonable use of subway shield defoaming agent can significantly improve the construction efficiency, reduce the shutdown time caused by foam problems, and reduce the construction cost. At the same time, the application of defoaming agent also helps to reduce the surrounding environmental pollution caused by excessive foam overflow, and improve the overall efficiency of the project.
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