Method for deep excavation pit combination support construction close to subway station

Abstract

The invention discloses a method for deep excavation pit combination support construction close to a subway station. The method is safe, reliable, short in construction period and low in construction cost and comprises the following steps that (1) two rows of reinforced concrete cast-in-place concrete piles are arranged at the outer side of an underground structure of an entrance and an exit of the subway station for blocking soil; (2) a single row of reinforced concrete cast-in-place concrete piles are arranged at the inner side of the underground structure of the exit and the entrance of the subway station; (3) coupling beams at the top of the reinforced concrete cast-in-plate concrete piles are constructed; and (4) when each coupling beam reaches to strength, earth excavation to a deep excavation pit is performed and in the process of excavation, a plurality of rows of steel tube inner supports are arranged transversally from top to bottom between the single row of reinforced concrete cast-in-place concrete piles and the deep excavation pit and meanwhile and meanwhile, soil nailing wall reinforce is adopted to the bottom of the underground structure of the exit and the entrance of the subway station in a matched mode until the earth excavation is performed to the bottom of the deep excavation pit.

Description

[0001] technical field [0002] The invention relates to a building construction method, more specifically, a construction method for combined deep foundation pit support adjacent to a subway station. This method is especially suitable for deep foundation pit support adjacent to a subway station, and is also suitable for protection levels adjacent Deep foundation pit support next to tall buildings. Background technique [0003] In recent years, the traffic congestion in large and medium-sized cities in China has been deteriorating. The government has built a large number of subway rail transit for this purpose. With the rapid development of the city, the subway rail has been continuously covered and extended in the city, and has become an important means of transportation for urban people. The subway Along the line, it has gradually become the first choice for people to live. A large number of buildings built along the subway line, the underground structure is mostly close ...

AI Technical Summary

Problems solved by technology

A large number of buildings built along the subway line, the underground structure is mostly close to the subway station and the subway tunnel, and the underground structure of some commercial buildings is directly connected to the subway platform. The control requirements for the displacement, deformation and application of supporting prestress of the deep foundation pit support system are very high. The existing deep foundation pit support system adopts the reinforced concrete composite internal support method, and the concrete curing strength needs to meet the design requirements. Earth excavation can be carried out later, the construction period is longer, and the demolition is difficult, which greatly affects the construction speed of underground structures, and the construction cost will increase significantly

This method is not suitable for this trend, and a more scientific, safe and reliable method is needed

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