The secondary lining trolley, also known as the tunnel secondary lining trolley, is a specialized equipment used during the secondary lining stage of tunnel construction. The following is a detailed introduction to the secondary lining trolley:

Type and Characteristics

According to different structures and functions, secondary lining trolleys can be divided into various types, such as simple lining trolleys, fully hydraulic automatic walking lining trolleys, grid type lining trolleys, etc. Among them, the fully hydraulic lining trolley can be further divided into edge top arch type, full circle needle beam type, bottom mold needle beam type, full circle walking type, etc.

Full circle through type: suitable for situations where concrete construction longitudinal joints are not allowed in hydraulic tunnels with large spans.

Edge top arch type: It is widely used in the construction of concrete secondary lining for highways, railway tunnels, and underground caverns.

In addition, the secondary lining trolley is generally designed as a steel arch frame type, using standard combination steel formwork. Some may not have automatic walking and use external power dragging. The removal and erection of the formwork are all manually operated, resulting in high labor intensity. This type of lining trolley is generally used for short tunnel construction, especially for tunnel concrete lining construction with complex plane and spatial geometric shapes, frequent process transitions, and strict process requirements. Its superiority is more obvious.

Application and advantages

The second lining trolley is widely used in bridge construction, tunnel construction and other fields, especially in tunnel construction. The second lining trolley can transport the tunnel lining plate to the construction site and install it. Its application can improve work efficiency, reduce labor intensity, and ensure construction quality.

In addition, some advanced secondary lining trolleys are equipped with intelligent monitoring systems, such as secondary lining anti void device systems and secondary lining arch top mold grouting automatic control systems, which can further enhance the safety and efficiency of tunnel construction.

In summary, as one of the indispensable equipment in tunnel construction, the secondary lining trolley has a wide range of application prospects and significant advantages.