The entire mass of the tunnel lining trolley is transmitted to the supporting organization through the steel mold of the trolley, and then to the portal frame. The lining concrete is in a solid-liquid state. Large vertical pressure and lateral pressure are generated on the top and side, and a large buoyancy occurs together. When the buoyancy exceeds the straight pressure and the weight of the trolley, the trolley will float up. It will not work normally.
In order to deal with this technical problem, after careful calculation, optimized planning, and reasonable selection of each supporting position. That is, the lower longitudinal beams inside the mast are supported on the ground to prevent the side pressure from causing the mast columns to retract, and there are several horizontal supports on the outer side of the mast and the longitudinal beams of the side form, at the upper beam and the upper longitudinal beam of the mast. Several straight supports are selected (the top hydraulic cylinders are arranged on the horizontal part of the gantry at both ends, and the center is a straight supporting screw), which is uniformly distributed in the longitudinal direction of the trolley.
The hydraulic cylinder is determined by hydraulic lock, and the supporting screw is used for mechanical determination, which ensures that the hydraulic cylinder will not retract and the template will not be deformed during the lining construction. Tunnel lining trolley: Lining formwork trolley (referred to as trolley) is the construction equipment for pouring the secondary lining concrete of the tunnel. Cooperating with other auxiliary machinery, it can greatly reduce the labor force, improve the mechanization efficiency of the second lining construction of the tunnel, and improve the construction progress. It has investment It has the advantages of low cost, reliable structure, convenient operation, and good tunnel forming surface. Therefore, it is widely used in the construction of highways, railways, hydropower, municipal, national defense, and other projects.
The tunnel lining trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel. In the construction of hydraulic tunnels and bridges, lifting slipforms, jacking slipforms and overturning forms are also commonly used. The tunnel lining trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel.
The tunnel lining trolley adopts hydraulic transmission, which simplifies the structure of the trolley frame and reduces the weight. At the same time, it also improves the flexibility and diversity of the structure. After the analysis and comparison of various trolley frame structure schemes, the strength calculation and optimization select 9m four doors. With a 12m main portal structure, its structural weight is reduced by more than 40% compared with the mechanical type, and the production cost is reduced by more than 25%.
The steel mold is the working device of the tunnel lining trolley. Its appearance quality and dimensional accuracy directly determine the quality of the concrete lining. At the same time, it is also a difficult part to process. A reasonable processing and welding process has been formulated, and special assembled welded tires have been designed and processed. Die to ensure the accuracy of the overall dimensions, minimize welding distortion, and ensure that the outer surface is smooth and free of defects such as unevenness.
In order to control the misalignment of adjacent templates, the stabilizing pins of interference fit are used to fix the connecting plates of adjacent templates as a whole, which effectively controls the problem of misalignment of adjacent templates caused by the gap between the bolt holes.