Construction method of large-diameter digging pile in subway station on upper-soft and lower-hard stratum

Abstract

Disclosed is a construction method of a large-diameter digging pile in a subway station on an upper-soft and lower-hard stratum. The constructed digging pile is a concrete-filled steel tube pile which is located in the constructed subway station, and the concrete-filled steel tube pile comprises a steel tube supporting column, a middle joint structure and a lower joint structure. When the digging pile is constructed, the method comprises the steps that firstly, a pile hole is dug, wherein the pile hole of the constructed digging pile is dug from top to bottom and comprises an upper pile hole and a lower pile hole, the upper pile hole is located in an upper soil layer, and the lower pile hole is located in a lower bedrock layer; when the pile hole is dug, the process comprises the following steps that 101, the upper pile hole is dug, wherein hole opening digging and locking opening structure construction are conducted, and follow-up digging of the upper pile hole is conducted; secondly, the steel tube supporting column is hoisted; and thirdly, concrete pouring is conducted. The method is simple in step, reasonable in design and good in using effect, construction is easy and convenient, the construction process of the large-diameter digging pile in the upper-soft and lower-hard stratum can be easily, conveniently and rapidly accomplished, the construction quality is easy to guarantee, and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a method for constructing large-diameter hole-digging piles in subway stations on upper-soft and lower-hard strata. Background technique [0002] The subway station is an important building in the urban rail transit network. It is a place for passengers to take off, transfer and wait. The cover-excavation method is a new engineering construction method adopted when the underground engineering needs to cross obstacles such as roads and buildings. Specifically, after the ground is excavated to a certain depth, the top is closed, and the rest of the substructure is in the closed area. Construction under the roof. The main structure can be done forward or reversed. When using the cover-excavation method to construct a subway station in upper hard and lower soft ground, the construction is more difficult. For example, when constructing the Wusi Squar...

AI Technical Summary

Problems solved by technology

The diameter of the excavated piles to be constructed is Φ2m~Φ3m and the depth of the pile holes is 23m~25m. Due to the complex geological conditions in the construction area, the presence of quicksand layers, and the large excavation diameter, the actual construction is difficult

But nowadays, when constructing bored piles in upper hard and lower soft ground, especially when constructing large-diameter bored piles, there are few construction materials that can be used for reference, and there is no unified, standard and standardized construction method to follow In the actual construction process, there are unavoidable problems such as relatively random construction operations, low construction efficiency, and poor use of excavated piles formed during construction.

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