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2025
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What are the benefits of using a secondary lining trolley in tunnel excavation?
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In tunnel construction projects, the second lining trolley is widely used and is one of the most commonly employed pieces of equipment in such projects. This is a new high-tech device, many of whose designs are custom-made, enabling increased efficiency and reduced labor intensity.
In tunnel construction projects, the second lining trolley is widely used and represents one of the most commonly employed pieces of equipment in such projects. This is a new, high-tech device featuring many specialized designs that can enhance efficiency and reduce labor intensity. Below, we’ll take a closer look at its detailed features and functions.
The secondary lining trolley systems include the side-and-arch type, the straight-wall variable-section arch type, the full-circle needle-beam type, and the full-circle traversing type. Using steel-mold trolleys for concrete placement increases efficiency by 30% compared to traditional formwork. The speed of mold installation and removal is 2 to 3 times faster, and the labor required is reduced to one-fifth of the previous level. The full-section needle-beam steel-mold trolley is particularly suitable for concrete lining construction in underground caverns—such as water diversion tunnels and spillway tunnels—that have fully circular or elliptical cross-sections.
The secondary lining trolley can be adjusted and used according to the varying shapes of tunnel cross-sections and different methods of concrete placement for tunnel lining. Using such trolleys not only helps avoid construction interference and improve construction efficiency, but more importantly, significantly enhances the quality of tunnel lining work and also boosts the level of mechanization in tunnel construction.
Second-lining trolley models come in a variety of types, but their structures are basically the same and all consist of several major components: the formwork section, the gantry frame section, the traveling system, the support mechanism, the traversing system, and other auxiliary devices. In recent years, the design of steel-formwork trolleys has become increasingly standardized and modular, aiming for multi-purpose use with a single trolley to help reduce costs.
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What is a secondary lining trolley?
2025-11-13
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