A foam air multi-stage adjustment device for shield tunneling

Abstract

The invention relates to a multi-stage foam air adjusting device used for shield construction. The multi-stage foam air adjusting device is arranged on a shield tunneling machine and comprises a control unit, a fine air flow adjusting unit, a crude foam solution flow adjusting unit, a foam generation unit and a soil sensing unit, wherein the fine air flow adjusting unit, the crude foam solution flow adjusting unit, the foam generation unit and the soil sensing unit separately communicate with the control unit, and the fine air flow adjusting unit and the crude foam solution flow adjusting unitare connected with the foam generation unit through pipelines respectively. Compared with the prior art, the foaming effect can be improved, improper risk factors, caused by improper foam proportions, of soil modification can be avoided, the adaptive capacity of the shield tunneling machine in complex geologies can be expanded, the safety production performance of the shield tunneling machine during tunneling construction is greatly improved, the tunneling construction and management cost is effectively reduced, and remarkable economic benefits and good social benefits are generated.

Description

technical field [0001] The invention belongs to the technical field of shield machines, and in particular relates to a foam air multi-stage regulating device for shield machines. Background technique [0002] Earth pressure balance shield is a common engineering equipment for subway tunnel construction in soft soil areas. However, when shield tunneling passes through soil layers with poor flow plasticity, high water content, and high permeability coefficient, there are some technical problems such as soil liquefaction due to disturbance, slow propulsion speed, and easy cake formation on the cutter head. Engineering examples prove that the use of foam is not only beneficial to maintain the balance of soil pressure on the excavation surface, but also significantly reduces the mechanical load and cutterhead torque. Because the soil adjusted by foam has good fluidity, plasticity and waterproof permeability, the foam's The use of the earth pressure balance shield machine expands...

AI Technical Summary

Problems solved by technology

[0003] Shield machine is a technology-intensive major engineering equipment dedicated to underground engineering. With the development of shield machine manufacturing technology, it has become a trend to apply new materials and new processes to improve the level of shield machine manufacturing technology. In the process of foam adjustment , it is necessary to consider various factors for the mixing and adjustment of the foam stock solution, water and air that generate the foam. Therefore, the foam system has multiple adjustment links, which affect each other. If the treatment is not good, the foam ratio will be improper, which will affect the quality of the shield tunneling project. , safety, schedule and project cost

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