Construction method of station entrance-exit main body structure close to urban buildings and roads

Abstract

The invention provides a construction method of a station entrance-exit main body structure close to urban buildings and roads. The construction method specifically includes the steps that a first open-excavated vertical shaft is constructed, an underground-excavated channel is constructed and a second open-excavated vertical shaft is constructed, wherein the first open-excavated vertical shaft and the second open-excavated vertical shaft both are excavated through an upside-down well wall method and the first open-excavated vertical shaft is excavated to the location of the underground-excavated channel, the excavated area of the underground-excavated channel is subjected to deep hole strengthening grouting and is strengthened by erecting a pipe roof bracket, then a CRD construction method is adopted to construct the underground-excavated channel, after the first open-excavated vertical shaft and the underground-excavated channel are constructed, the other open-excavated areas are excavated while the second open-excavated vertical shaft is adopted, and the construction process of the station entrance-exit main body structure is completed.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to a construction method for a main structure of a station entrance and exit adjacent to urban buildings and roads. Background technique [0002] With the development of my country's urban rail transit construction, more and more cities have begun to carry out subway construction. The entrances and exits of many subway stations are generally located in the bustling downtown areas and traffic arteries of the city. The commercial and residential buildings around the construction area are dense, and the traffic The traffic is heavy, and some entrances and exits are close to commercial and residential buildings, municipal bridges and main roads, and the construction area will be limited due to the surrounding buildings. [0003] The entrances and exits of subway stations generally include the open cut area and the connecting part between the open cut area and the underground ...

AI Technical Summary

Problems solved by technology

Among them, the open cut area is a relatively important part in the construction process. The foundation pit enclosure structure of the traditional construction method of the open cut section at the entrance and exit of the station adopts bored piles and steel pipe inner supports. The site area is large, 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 and cannot be constructed, houses will be demolished, municipal roads will be occupied, and traffic diversions will be required, which will easily cause traffic jams. , and during the construction of bored piles, it is necessary to detect the position of the underground pipeline first. If the detection is not accurate, there is a great safety risk. When the pipeline is encountered, it needs to be relocated or the drilling position is moved. Especially when encountering some buildings that are not easy to be demolished, it will affect the entire construction plan.

If the cut-and-cut construction area is close to the building, the construction risk is higher, and the building needs to be reinforced and protected, which increases the difficulty of construction and increases the construction period

[0004] In addition, during the construction of the main structure of the entrance and exit of the station near urban buildings and roads, the construction of the connecting part between the open cut area and the hidden excavation area needs to drill a pilot tunnel from the open cut area, and the construction of the pilot tunnel Generally, the method of underground excavation is adopted. During the construction of the pilot tunnel, it has a great influence on the settlement and deformation of surrounding buildings and underground pipelines. Passing through below, because the distance between the underground tunnel and the ground is generally not very deep, and the building is generally equipped with a basement, so when the underground tunnel passes through the building, the distance between the specific building floor is relatively short, which is easier It will cause disturbance to the building, increase the engineering risk and construction difficulty, and there will be many unforeseen risks, and the construction will face a series of difficulties

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