Synchronous double-material muck improvement system for soil pressure balance shield

Abstract

A synchronous double-material muck improvement system for a soil pressure balance shield is used for effectively improving muck improvement speed and maximally reducing probabilities of cutter wearing, mud block generation and flowing. The system comprises a foam solution storage tank and a liquid storage tank for storing a second muck modifier. The foam solution storage tank is connected with a mixing box through a foam solution conveying pipe. The mixing box is connected with a plurality of foam conveying pipes. Each foam conveying pipe is connected with a corresponding high-pressure voltageconveying pipe and is connected with a corresponding foam generating pipe. The liquid storage tank is connected with a plurality of second muck modifier conveying pipes. Each second muck modifier conveying pipe is connected with the end of the corresponding foam generating pipe. The foams are mixed with the second muck modifier. The second muck modifier conveying pipe is connected with a nozzle in front of a cutterhead through a jet pipe for directly and uniformly spraying to a tunnel face in front of the cutterhead.

Description

technical field [0001] The invention relates to the construction of an earth pressure balance shield, in particular to a synchronous double-material dreg improvement system for the earth pressure balance shield. Background technique [0002] With its advantages of safety, reliability, speed, economy, and environmental protection, the shield method is widely used in subways in major cities. Earth pressure balance shields are increasingly used in the construction of urban subway tunnels. Earth pressure balance shield muck improvement plays a very important role in shield construction. At present, the improvement materials of slag mainly include foam, bentonite mud, polymer aqueous solution and water. At present, in the construction of earth pressure balance shield tunneling, only one kind of muck improvement material can not achieve the flow plasticity, low internal friction angle and low permeability dreg state required by the shield, and generally two kinds of muck improve...

AI Technical Summary

Problems solved by technology

The advantages of the two materials for improving the dregs cannot be used in the cutting process in front of the cutter head at the same time, resulting in the dregs in front of the cutter head not being able to reach the required dregs state as soon as possible, resulting in increased tool wear, uneven mixing of muck, and easy Phenomena such as mud cake and gushing

Shield constructors have been studying the injection position and quantity of different muck modifiers, but problems cannot be completely avoided

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