Steel formwork support system for extruded concrete lining method for shielding rectangular tunnel

Abstract

The steel formwork supporting system for the lining process of pressurized depositing concrete in rectangular shield process consists of several rings arranged longitudinally and closely along the tunnel. The rings are connected via positioning pins and screws and each of the rings is assembled inside the tail casing of the rectangular tunnel shield machine. Each ring includes one right unit, one left unit, several middle units and several connecting units, and each of the units consists of different types of steel formworks and adjustable supports. The present invention also discloses the method of constructing the steel formwork supporting system. The present invention has the advantages of simple members, reasonable structure, high bearing capacity, simple assembling, short construction period and low cost, and may be applied together with pressure grouting concrete lining process in rectangular tunnel construction.

Description

Technical field: [0001] The invention relates to tunnel construction equipment, in particular to a rectangular shield pressurized concrete lining method steel template support system. Background technique: [0002] Rectangular tunnels are widely used in underground projects such as railways, highway underpasses and subway bypasses, underground shopping malls, and air defense facilities due to their reasonable shape, high effective area utilization, and low material consumption. The existing underground rectangular tunnel construction usually adopts the following methods: large excavation, box culvert method, pipe curtain method and pipe jacking method. Large-scale excavation is to dig down from the ground to the required depth and width, pour reinforced concrete, line the required rectangular tunnel, and then backfill the covering soil; this construction method will inevitably affect the traffic on the ground and normal activities of people. It is almost impossible to const...

AI Technical Summary

Problems solved by technology

The pipe jacking method needs to make many pipe joints in the factory in advance, transport them to the construction site, and then hoist them into the launch shaft, and use the oil cylinder to drive the pipe joints against the pipe jacking machine one by one. Obviously, for super large rectangular cross section For pipe joints, it is very difficult to manufacture, transport and hoist, so the pipe jacking method is generally only suitable for the construction of small and medium-sized (4m×6m or less) rectangular tunnels

[0003] To sum up, the existing construction methods for rectangular tunnels have their own limitations: the box culvert method and the pipe curtain method are only suitable for the construction of short-distance, large-section rectangular tunnels, and the pipe jacking method is only suitable for The construction of long-distance, small-section rectangular tunnels, and the large-scale excavation method will only be considered on open construction sites

"However, for large-section rectangular tunnels, the concrete self-weight, pouring pressure, stratum weight, ground load and thrust of the shield are all very huge, and the arch lining and retaining wall are only made of relatively small size and weight. It is composed of standard parts, there are many connecting links, and there is no intermediate support at the same time, so its strength and rigidity are difficult to withstand the huge load generated by the concrete lining of large rectangular tunnels during pouring

In addition, the arch lining and retaining wall described in this patent is composed of many small standard components, so a considerable number of components are required to construct a tunnel with a huge section, and a large amount of manual assembly is required, which is not only It consumes a lot of labor and will greatly prolong the construction period

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