Shield Sealing Device with Elastic Inner Ring for Tunneling
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Solution Overview
Problem
The existing shield tunneling machine sealing methods are inadequate due to the larger diameter of the cutter head, leading to poor sealing performance, water leakage, slurry leakage, and increased construction time, which can result in disasters like tunnel collapse and ground surface settlement.
Innovation Solution
A shield sealing device with an elastic inner ring and control units mounted on a pile wall, where the control units are arranged circumferentially to extrude or release the elastic inner ring, adapting to the changing diameter of the shield tunneling machine, ensuring effective sealing without manual plate insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed diameter pressing plate and cord fabric are used at the receiving opening, then the sealing structure is simple, but the sealing performance deteriorates when the cutter head passes through due to diameter difference
Solution Approach 1:
The pressing plate is designed with adjustable diameter through hydraulic cylinders, allowing it to dynamically change size from a first diameter (when retracted) to a second diameter (when extended). This dynamic adjustment enables the pressing plate to adapt to different diameters of the shield tunneling machine components during the receiving process, maintaining effective sealing throughout the operation.
Solution Approach 2:
The sealing system changes the diameter parameter of the pressing plate by controlling the extension or retraction of hydraulic cylinders. When the cutter head approaches, the pressing plate extends to a larger diameter to seal against it; when other components pass through, it retracts to a smaller diameter, thereby adapting to parameter changes in the passing components.
2Reliability
If manual step-by-step plate insertion is performed to maintain sealing, then sealing performance can be maintained, but construction time increases and construction efficiency decreases
Solution Approach 1:
The sealing system operates automatically through a control system that detects the position of shield components and autonomously controls the hydraulic cylinders to adjust the pressing plate diameter. This eliminates the need for manual intervention and step-by-step plate insertion, allowing the system to self-adjust and maintain sealing while improving construction efficiency.
Solution Approach 2:
The control system receives feedback on the position of the shield tunneling machine components and automatically adjusts the pressing plate diameter accordingly. This closed-loop control ensures continuous sealing performance without manual intervention, resolving the contradiction between reliable sealing and construction efficiency.
3Reliability
If manual plate insertion is required to maintain sealing, then sealing can be maintained, but construction risk increases due to worker safety concerns
Solution Approach 1:
The sealing system operates autonomously without requiring workers to manually insert plates into the receiving opening. The automated hydraulic adjustment and control system performs all sealing adjustments, eliminating workers from hazardous zones and removing the need for manual intervention near the tunnel face, thereby significantly reducing construction risk.
4Device complexity
If the pressing plate diameter is fixed, then the device structure is simple, but water and slurry leakage occurs when the cutter head passes through
Solution Approach 1:
The pressing plate incorporates hydraulic cylinders that enable dynamic diameter adjustment. When the cutter head approaches, the hydraulic cylinders extend to increase the pressing plate diameter, ensuring adequate sealing pressure and preventing water and slurry leakage. This dynamic capability resolves the contradiction between structural simplicity and leakage prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and efficient sealing mechanism that prevents water and slurry leakage, enhances safety, and reduces construction time by automatically adjusting to the changing diameter of the shield tunneling machine, ensuring a high safety coefficient and convenient operation.
Implementation Method 1
an elastic inner ring, an inner wall of the elastic inner ring adapting to an outer wall of a cutter head of a shield tunneling machine; and a plurality of control units, the plurality of control units being mounted on the pile wall, the plurality of control units being arranged in a circumferential direction of the elastic inner ring at intervals, and a driving end of the control part pressing against an outer side of the elastic inner ring so as to extrude or release the elastic inner ring
Data Source
AI summary
The present disclosure provides a shield sealing device and a shield sealing method, a pile wall is arranged at a shield receiving opening, the shield sealing device is mounted on the pile wall, and the shield sealing device comprises: an elastic inner ring, an inner wall of the elastic inner ring adapting to an outer wall of a cutter head of a shield tunneling machine; and a plurality of control units, the plurality of control units being mounted on the pile wall, the plurality of control units being arranged in a circumferential direction of the elastic inner ring at intervals, and a driving end of the control part pressing against an outer side of the elastic inner ring so as to extrude or release the elastic inner ring.