Construction method of rapid excavation of earthworks of subway station row pile and super large and super deep foundation pit with internal stay

Abstract

The invention relates to a construction method of rapid excavation of earthworks of a subway station row pile and a super large and super deep foundation pit with an internal stay. The construction method includes the following steps that the number of excavation layers and the excavation depth of each layer are designed according to the relative relation among a subway station foundation pit support structured crown beam, the support drawing elevation and the actual site elevation; the excavation routes and steps are divided into five parts, firstly, earthworks above the elevation of the crown beam bottom are excavated; secondly, earthworks of the opening part of the row pile are excavated; thirdly, a rope saw is used for punching in the row pile on the lower part of the crown beam; fourthly, earthworks in the range of an opening elevation foundation pit are excavated; and fifthly, lower earthworks in the range of an opening elevation foundation pit are excavated. According to the construction method of rapid excavation of the earthworks of the subway station row pile and the super large and super deep foundation pit with an internal stay, a portal and a slag car transport ramp are newly arranged on the row pile below the foundation pit crown beam, earthwork excavation is conducted using common excavation machines, the investment of large excavation machines is reduced, meanwhile, the construction speed is increased, the construction period is shortened, and then the cost is saved; and the excavation working efficiency of the earthworks cannot be limited due to the super-long span of the foundation pit, the schedule of the construction period is ensured, and the budget of the construction period is facilitated.

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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