When the shield tunnel passes through special areas such as rivers and buildings, what higher performance requirements do the shield segment bolts need to meet?
Publish Time: 2024-08-10
When the shield tunnel passes through special areas such as rivers and buildings, the shield segment bolts need to meet higher performance requirements to ensure the safety and stability of the tunnel structure.
First, when crossing a river, due to the existence of water pressure, the shield segment bolts need to have higher sealing performance. The bolts must be able to tightly connect the segments to prevent river water from penetrating into the tunnel through the gaps in the segments. This requires that the material of the bolts has good corrosion resistance to resist the erosion that may be caused by the river water. At the same time, the tightening force of the bolts must be large enough and uniform to ensure that the sealing gaskets between the segments can be fully compressed to form an effective waterproof barrier. For example, high-strength and corrosion-resistant alloy steel bolts are used, and the consistency of the tightening force is ensured by precise torque control.
When passing under buildings, the shield segment bolts need to have a higher load-bearing capacity. Because the weight of the building above the tunnel will increase the pressure on the tunnel structure, the bolts must be able to withstand these additional loads without loosening or deformation. At this time, the strength grade of the bolts should be increased accordingly. It may be necessary to select higher-strength steel and perform special heat treatment on it to enhance the mechanical properties. In this case, the bolts also need to have good seismic resistance. When vibrations such as earthquakes occur, the bolts must ensure that the connection between the segments is firm and prevent the segments from being dislocated or collapsed. For example, by optimizing the structural design of the bolts, increasing their shear and bending resistance, and using special shock-absorbing gaskets and other auxiliary measures during installation to reduce the impact of vibration on the bolt connection.
In addition, when constructing in these special sections, the installation accuracy of the bolts is also required to be higher. More stringent quality control and testing methods are required to ensure that each bolt can be accurately installed in place to ensure the integrity and safety of the overall structure of the tunnel. In short, when the shield tunnel passes through special sections, the shield segment bolts can only ensure the smooth progress and long-term stable operation of the tunnel project if they meet these higher performance requirements.
