Shield Tunneling Construction Procedures
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Release time:
2024-08-06
I. Geological Survey
Before constructing using the shield method, it is necessary to conduct a detailed geological survey of the construction area to determine the tunneling conditions, predict the state of the surrounding rock, and finalize the tunnel alignment. The geological survey also includes a thorough investigation of groundwater conditions, enabling the design, installation, and commissioning of waterproofing systems tailored to the specific groundwater situation.
II. Equipment Debugging
Before starting shield tunneling construction, it is necessary to commission equipment such as the tunnel boring machine to ensure proper operation. This includes determining the structural parameters of the tunneling shield and adjusting its components.
III. Tunneling Construction
Excavation construction is the most critical process in shield tunneling, primarily involving tasks such as breaking up rock and soil, removing excavated spoil, and installing segment rings. This excavation work requires precise coordination, with operational parameters—such as hydraulic pressure and advancing speed—carefully controlled to achieve the desired squeezing and cutting effects. Throughout the entire construction process, strict adherence to operating procedures is essential. Additionally, during shield tunneling, it’s crucial to prevent external impurities from infiltrating the slurry system, which could lead to equipment malfunctions or even serious hazards.
IV. Subsequent Processes
After the tunnel boring method construction is completed, subsequent processes such as applying an emulsified asphalt waterproof coating to the tunnel, reinforcing it with an internal lining of steel mesh, and injecting cement mortar are required. The purpose of these follow-up procedures is to prevent water leakage and enhance the tunnel's overall stability and durability.
In summary, the shield tunneling method involves numerous construction procedures, yet each step is absolutely essential. Only by meticulously executing every stage can we ensure smooth tunneling operations and reliable工程质量.
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