Construction method for connecting subway station and long-span accessory structure

Abstract

The invention discloses a construction method for connecting a subway station and a long-span accessory structure and relates to the technical field of engineering construction. The construction method includes steps of building an accessory structure retaining pile and a top beam, and excavating earth till the bottom of the top beam; according to a position requiring steel support in a foundation pit, marking a steel support erection pile position and a main structure retaining pile which needs to be broken down firstly; cutting reinforcing concrete on a connection portion between the main structure retaining pile and the top beam; erecting the steel support when the earth of the foundation pit is excavated till marked height of the steel support, and then excavating till the bottom of the foundation pit; breaking down the marked main structure retaining pile which needs to be broken down firstly, and building a base plate of the accessory structure and a first base plate post-cast strip; and after the base plate and the first base plate post-cast strip are finished, and strength of the base plate meets detaching requirement of the steel support, detaching the steel support, breaking down the rest main structure retaining piles, then building a second base-plate post-cast strip to be connected with the main structure, and sequentially building the rest structures from the bottom up.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a construction method for the interface between a subway station and a large-span auxiliary structure. Background technique [0002] At present, in the construction of deep foundation pit engineering of large-span auxiliary structures of subway stations, especially when the surrounding environment is complex, in order to ensure the quality of the project and the safety of construction, the space between the main structure enclosure piles and the attachment structure enclosure piles is usually increased during design. steel support, the construction steps are: [0003] 1. See figure 1 As shown, the auxiliary structure enclosing pile 4 and the crown beam 6 are executed, and then the earthwork is excavated to the bottom of the crown beam 6. [0004] 2. See figure 2 As shown, when the foundation pit earthwork is excavated to the erection elevation of the steel su...

AI Technical Summary

Problems solved by technology

Therefore, when the retaining piles of the main structure are broken, the construction space is narrow, which makes it difficult to clear and transport the concrete blocks, and it needs to be intersected with the subsequent structural construction, which not only has hidden dangers in quality and safety, but also causes a slow construction period

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