Construction method of rapid excavation of super-large and super-deep foundation pit for subway station piles and inner support

Abstract

The invention relates to a construction method for rapid excavation of super-large and super-deep foundation pits of subway station piles and inner supports, comprising the following steps: designing the excavation layer according to the relative relationship between the elevation of the foundation pit enclosure structure of the subway station, the elevation of the support drawing and the elevation of the actual site and the excavation depth of each layer; the excavation route and steps are divided into five parts. The first step is to excavate the earthwork above the bottom level of the crown beam, the second step is to excavate the earthwork for the row of piles, and the third step is to use a wire saw on the crown beam. Holes are opened at the lower row of piles, the fourth step is to excavate the earthwork within the scope of the excavation facade foundation pit, and the fifth step is to excavate the lower earthwork within the scope of the excavation facade foundation pit; Added a portal and a muck truck transport ramp, using commonly used excavation machinery for earthwork excavation, reducing the investment of large excavation machinery, speeding up the construction, reducing the construction period and saving costs, and will not be affected by the foundation pit. The ultra-long span limits the excavation efficiency of the earthwork, ensures the progress of the construction period, and facilitates the budget of the construction period.

Description

technical field [0001] The invention relates to a quick excavation construction method for super-large and super-deep foundation pit earthwork of a subway station row of piles and inner supports, and belongs to the field of open-cut construction of subway stations. Background technique [0002] At present, urbanization is advancing by leaps and bounds, and subway construction is booming. There are many high-rise buildings around the subway construction site, the traffic is busy, and the environment is becoming more and more complex. A variety of large-scale excavating machines and muck trucks are required during the excavation construction process, and the noise is seriously exceeding the standard, which increases the difficulty of excavating the excavation of the subway foundation pit. In addition, due to the large span and depth of some foundation pits, ordinary excavation machines cannot excavate normally. It is necessary to use multiple large-scale long-arm excavation ma...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a quick excavation construction method for super-large and super-deep foundation pit earthwork of subway station piles and inner support, which is used to solve the problems of high construction cost and inability to excavate the earthwork of super-large and super-deep foundation pit Guaranteeing the progress of the construction period

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