Construction method for evacuating subway station by prefabricated structure cover

Abstract

The invention discloses a construction method for evacuating a subway station by a prefabricated structure cover. The construction method comprises the following steps of 1, prefabricating a corresponding component outside a construction site in a factory way; 2, utilizing a pile pressing-in machine to press a prefabricated fender pile and a vertical column pile into designed positions at the construction site; 3, excavating a foundation pit, casting a coping ring beam and a horizontal support, paving a prefabricated laminating plate, and casting a structure top plate; 4, backfilling the upper earth, and restoring the transportation on a road; 5, continuing to downwards excavate earth, and casting a bottom plate of the first underground layer; 6, continuing to excavate, and casting a foundation bottom plate and a building edge wall; 7, completing other parts of the subway station, so as to complete the construction. The construction method has the beneficial effects that the fender pile and the vertical column pile are pressed at night, so the influence on surrounding environments is little; the top plate formwork is made of the prefabricated laminating plate, so the formwork support and detachment time is shortened, and the time of blocking the road transportation during construction is shorter.

Description

technical field [0001] The invention relates to a construction method for covering and excavating a subway station by using a prefabricated structure, and is especially suitable for covering and excavating a subway station in the central area of ​​a city. Background technique [0002] At present, when excavating underground structures such as subway stations in prosperous urban areas, roads are often closed, which affects normal traffic; the traditional construction method for this problem is underground excavation or cover excavation, but the buried depth is not more than 5m in the soil layer. Excavation can easily cause ground uplift or subsidence; the traditional cover excavation method excavates from the ground down to the depth of the roof, then closes the top and restores the temporary road, and the rest of the substructure is constructed under the closed roof; but the existing cover In the excavation construction method, the enveloping structure mostly adopts the cast...

AI Technical Summary

Problems solved by technology

[0002] At present, when excavating underground structures such as subway stations in prosperous urban areas, roads are often closed, which affects normal traffic; the traditional construction method for this problem is underground excavation or cover excavation, but the buried depth is not more than 5m in the soil layer. Excavation can easily cause ground uplift or subsidence; the traditional cover excavation method excavates from the ground down to the depth of the roof, then closes the top and restores the temporary road, and the rest of the substructure is constructed under the closed roof; but the existing cover In the excavation construction method, the enveloping structure mostly adopts the cast-in-place method, and the transportation of commercial concrete and construction raw materials takes up more roads; when pouring the roof of the subway station, it takes a long time to set up the formwork and remove the formwork, which affects the time for backfilling, and the long-term full-time road closure increases traffic. congestion problem

[0003] Chinese patent CN 102926403 A discloses a roof construction method of cover-excavation method. The roof adopts a cast-in-place concrete structure with a bedding layer and then a formwork support. After the concrete curing is completed, the formwork and bedding layer need to be removed, and the required construction period is too long.

[0004] Chinese patent CN 103741714 A discloses a construction method of full cover excavation for underground engineering, using underground diaphragm walls as enclosure structures. The mud treatment is difficult, which is not conducive to the green development of the subway project

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