A Construction Method of Upside-Down Shaft Wall in Open-cut Section of Entrance and Exit

Abstract

The invention discloses a construction method for an entrance open excavation inverted well wall. The method comprises the following steps: S1) firstly excavating a vertical shaft close to one side of underground excavation, finishing a lining structure after the vertical shaft reaches the bottomand reserving post-cast strip joints for two construction joints; S2) excavating an adjacent vertical shaft, constructing a secondary lining structure after the vertical shaft reaches the bottom and reserving post-cast strip joints for two construction joints; S3) lastly removing the well wall between the vertical shaft S1 and the vertical shaft S2, pouring and then pouring a post-cast strip top plate sidewall structure. The construction method solves the problem that the traditional station entrance / exit open excavation sections occupy large area, occupy municipal administration path and are easy to cause serious traffic jam; the disassembling and reforming fees at early stage are lowered; the problems of difficulties in placing and construction of construction equipment caused by insufficient area are solved; the disturbance to the peripheral buildings and soil layers is reduced; the safety of the peripheral buildings and underground pipelines is ensured.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to an upside-down shaft wall construction method for open cut sections at entrances and exits. Background technique [0002] The open cut section of the entrance and exit of the subway station is generally set in the bustling downtown area and traffic arteries of the city. The surrounding commercial and residential buildings are dense and the traffic flow is large. Due to the narrowness of the site, some entrances and exits are close to commercial and residential buildings, municipal bridges and main roads. Open-cut construction occupies a large area, the surrounding environment is complex, it is very difficult to demolish and relocate the underground pipelines of houses, it is difficult to guide traffic, and it is easy to cause traffic jams. Difficult and time-consuming pressure. There will also be many unforeseen risks, and the construction will face a series of diff...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the traditional open-cut construction method at station entrances and exits are: 1) The construction of bored piles and steel pipe inner supports takes up a large construction site, requires house demolition, occupies municipal roads, and requires traffic guidance and modification, which is likely to cause traffic jams. The cost is high; 2) The construction of bored piles and steel pipe inner supports takes up a large area, and it is difficult to place large mechanical equipment such as piling machines and cranes. The processing of steel cages requires a large construction site. If the site is small, it cannot be constructed; 3) Close to the building, the construction risk is high, and the building needs to be reinforced and protected. In the narrow place, the bored pile cannot even be constructed; 4) When the bored pile is constructed, it is necessary to detect the position of the underground pipeline first, and the detection is not allowed to exist A great safety risk, when encountering pipelines, it needs to be relocated or the location of the drilling hole needs to be moved

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