Introduction to shield tunnel engineering?
Release time:
2023-10-09
Shield tunneling refers to the construction of tunnel engineering projects through shield construction. Tunnels are engineering buildings buried in the ground and are a form of human utilization of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, and mining tunnels.
What is the basic situation of shield tunnel projects in my country at this stage? What should I pay attention to?
The basic situation of the shield tunnel project is as follows:
Shield tunneling refers to the construction of tunnel engineering projects through shield construction. Tunnels are engineering buildings buried in the ground and are a form of human utilization of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, and mining tunnels.
At this stage, what should construction companies pay attention to when carrying out shield tunnel projects? The basic overview is as follows:
First, understand the construction methods of shield tunnel engineering:
The shield tunneling method is a fully mechanized construction method in underground excavation construction. It advances the shield machine in the ground, and uses the shield shell and segments to support the surrounding rock to prevent collapse into the tunnel. At the same time, a cutting device is used to excavate the soil in front of the excavation face, and it is transported out through the excavation machinery.
Outside the tunnel, a jack is used to pressurize the rear and assemble prefabricated concrete segments to form a mechanized construction method of the tunnel structure.
Secondly, we understand the basic conditions for shield tunnel engineering construction operations:
The shield tunneling method can be used in soft water-bearing strata or when facilities such as underground lines are buried 10m or deeper.
1. The construction of working shafts for shield tunnel entry and exit and ballast feeding is allowed on the line;
2. The tunnel must have sufficient burial depth, and the covering depth should be no less than 6m and no less than the diameter of the shield;
3. Relatively homogeneous geological conditions;
4. If it is a single hole, there must be sufficient line spacing. The minimum thickness of soil (rock) reinforcement between holes and holes and other buildings (structures) is 1.0m in the horizontal direction and 1.0m in the vertical direction. 1.5m;
5. From an economic point of view, the continuous construction length should not be less than 300m.
Finally, let’s take a look at the advantages of the shield tunneling method compared to other shield tunneling projects:
(1) Safe excavation and lining, fast excavation speed;
(2) The entire process of shield advancement, excavation, and lining assembly can be automated, and the construction labor intensity is low.
(3) Does not affect ground transportation and facilities, and does not affect underground pipelines and other facilities;
(4) Navigation will not be affected when crossing the river, and the construction will not be affected by climate conditions such as seasons, wind and rain, and there will be no noise or disturbance during the construction;
(5) Building long tunnels with large burial depths in soft water-bearing strata often has technical and economic advantages.
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