Open-cutting and undercutting combined metro station structure avoiding housing demolition and construction method thereof

Abstract

The invention discloses an open-cutting and undercutting combined metro station structure avoiding housing demolition and a construction method thereof. The structure is composed of an open-cutting area defined by a plurality of open-cutting fender posts and an undercutting area under a building. The open-cutting area is constructed firstly, and then the undercutting area is constructed. Before undercutting structure construction, a transverse advanced large pipe shed is set up in advance, and the pipe shed is supported by undercutting side poles and an open-cutting top plate constructed in advance. The undercutting side poles are constructed through longitudinal side pilot tunnels, and before pilot tunnel construction, pilot tunnel periphery deep hole grouting is performed for reinforcingfirstly. Soil excavation is performed and an undercutting top plate are poured under protection of a pre-supporting system of the large pipe shed, and after the top plate reaches the structural strength, side walls, middle plates, a bottom plate and other structures of the undercutting area are constructed in an inverted construction method. According to the open-cutting and undercutting combinedmetro station structure avoiding housing demolition and the construction method thereof, demolition can be avoided, the work schedule is guaranteed, the coordination difficulty is reduced, the work investment is lowered, an underground box frame system is kept unchanged, and no influence exists on building function and operating management.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a subway station structure and a construction method for avoiding house demolition combined with open and dark excavation. Background technique [0002] Under the conditions of open-cut construction for subway stations, and when the roof is less covered with soil, the open-cut construction is generally less difficult, less risky, faster and more economical. However, often due to the limitations of various external conditions, when the surface buildings cannot be demolished, the station cannot adopt full-open excavation construction. If full-covered excavation is used, it will inevitably lead to high construction risks, great difficulties, and long construction time. For the phenomenon of high cost, if the combination of underground excavation and open excavation can be adopted at this time, unexpected results can be obtained. According to the engineering practice in recent ...

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Problems solved by technology

like Figure 13 The underground excavation of the platform, the open excavation of the station hall and the equipment floor are shown, such as Figure 14 Half-cutting, half-cutting, such as Figure 15 Excavation at both ends and underground excavation in the middle, such as Figure 16 Open cut in the middle and underground excavation at both ends, and in the plan of open cut at both ends and underground excavation in the middle, the overall layout of the station is "end hall type". Since the station halls at both ends are not connected to each other, the operation and management are inconvenient and the traffic efficiency is low

In the schemes of underground excavation of the platform, open excavation of the station hall and equipment floor, and half-side open-cut and half-underground excavation schemes, the width of the station hall is often limited, the public area of ​​the station hall is narrow, the collection and distribution capacity is low, management is inconvenient, and equipment layout is difficult

In the scheme of open cut in the middle and underground cut at both ends, due to the limited length of the station, the area of ​​the public area is compressed, the collection and distribution capacity is reduced, and the equipment layout is difficult

[0003] To sum up, although the traditional open and concealed excavation combined station form can guarantee the feasibility, it still has the disadvantages of inconvenient operation and management, lack of building functions and difficult equipment layout.

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