Close-fitting open and underground excavation combined subway station structure and construction method thereof

Abstract

The invention relates to the field of subway design and construction, and provides a close-fitting open and underground excavation combined subway station structure and a construction method thereof.The close-fitting type open and underground excavation combined subway station structure and the construction method thereof aim to solve the problems of subway station land occupation, demolition, underground excavation scale control, construction difficulty control, risk control and the like. The construction method of the close-fitting open and underground excavation combined subway station comprises the following steps that an open and underground excavation ranges and boundaries are determined; the open excavation part is provided with fender posts; an underground excavation transverse pipe shed is constructed; excavating is carried out to a base of the open excavation part, an anti-pulling structure, a waterproof system and an open excavation main body are constructed, a steel bar connector is reserved at a connecting opening between open excavation and underground excavation, and backfilling and earthing are carried out; an advanced small pipe is constructed; the open excavationfender posts at the transverse boundary between open excavation and underground excavation are removed, and an underground excavation part is constructed longitudinally in pilot tunnels according toa bench cut method; an underground excavation secondary lining is constructed; and the open excavation fender posts and underground excavation primary supports at the longitudinal boundary between open excavation and underground excavation are removed in sections, and connecting structures and waterproof systems of a top plate and a bottom plate at the connecting opening between open excavation and underground excavation are constructed. The close-fitting type open and underground excavation combined subway station structure and the construction method thereof have the beneficial effects thatdemolition is avoided, risks and investment are controlled, the project progress is guaranteed and the coordination difficulty is reduced.

Description

technical field [0001] The invention relates to the field of subway design and construction, in particular to a close-fitting open and dark excavation combined subway station structure and a construction method thereof. 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. With the rapid development of rail transit construction in major cities, the subway network is becoming more and more dense. Affected by environmental conditions, geological conditions and other factors, the structural layout of stations is diversified. The construction method has also gradually developed from the simple and direct open cut method to the full cover excavation method, half cover excavation method, concealed excavation method and combined open and concealed excavation method. However, in the bustling areas of t...

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Problems solved by technology

[0006] To sum up, although the traditional open and concealed excavation combined station form can guarantee the feasibility, it has the following problems: the size and length of the excavation section are large, the construction is difficult and the risk is high; the line spacing is large, the cutting area is large, It has a great impact on urban planning, and the number of buildings passing through it has increased; equipment layout is difficult, or the equipment has high functional requirements; the main functional areas are scattered or connected by passages, which makes operation and management inconvenient and building functions lack; the choice of construction methods in adjacent areas is restricted Wait

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