A detached open structure of a shallowly buried underground excavation subway station and its construction method

Abstract

The invention provides a shallow depth excavation subway station separation open type structure and a construction method thereof and relates to the technical field of tunnel construction. The shallow depth excavation subway station separation open type structure comprises two separated symmetrically-arranged tunnels; secondary lining base plates are arranged at the bottoms of the tunnels, two secondary lining side walls are arranged above the two sides of each secondary lining base plate, horizontally-arranged middle plates and secondary lining arch parts are arranged on the middle portions and the tops of the secondary lining side walls correspondingly, arch part primary supports are arranged on the outer portions of the secondary lining arch parts, advance supports are arranged on the outer sides of the arch part primary supports, primary support large arch feet are arranged at the lower ends of the arch part primary supports, side wall primary supports are arranged below the primary support large arch feet, a plurality of pre-stressed anchor cables are arranged on each side wall primary support, and locking anchor pipes are arranged between the pre-stressed anchor cables; and base plate under layers and inverted arch primary supports are arranged below the secondary lining base plates. According to the shallow depth excavation subway station separation open type structure and the construction method thereof, an enough operation space and a high construction speed can be provided, and the purpose that rock stratum underground structure construction is conducted in a large mechanization mode is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a separate open structure of a shallow-buried underground excavation subway station and a construction method thereof. Background technique [0002] Urban subway underground stations generally have different types of island platforms, side platforms, and island-side hybrid platforms according to their functions. The island platforms have complete functions, are convenient to use, and have good architectural effects. At present, most stations adopt the layout of island platforms. . For a standard island platform, if the platform width is 12m, the structural dimension width of the entire station will reach about 21m. Due to the complex urban environment, it is often affected by traffic, buildings, pipelines or bridge piles, etc. In particular, many urban arterial roads have built or planned viaducts on the ground, and subway stations are to be built underground. At thi...

AI Technical Summary

Problems solved by technology

If this type of station is located on a rocky ground, it will be difficult to construct the station using hole pile method or CRD construction method.

Because the hole pile method or CRD construction method divides the section into several small pieces, only small-scale mechanical or manual excavation and transportation operations can be adopted, and the procedures are numerous and complicated, and the progress is slow; it is difficult to form piles in rock formation holes; It is difficult to operate and dismantle, and the cost is high. At the same time, blasting is required for excavation in rock formations, and it is difficult to retain temporary supports. Once the blasting is damaged, it will cause a major safety accident, which has caused great problems for the construction.

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