Long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and construction method thereof

Abstract

The invention discloses a long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and a construction method thereof. The structure is characterized in that long piles and short piles are arranged in a staggering way at equal intervals in a single row of pile; the clear spacing between two adjacent piles is 200 to 400mm; two rows of concrete deep stirring piles are arranged behind a support pile to serve as a waterproof curtain; the layer number of internal supports is 1 to 3; the first layer of horizontal internal supports is generally arranged on the top of the support pile; the distance between the adjacent internal supports which are arranged up and down is 4 to 6m. When the supporting structure is designed, in all the rows of piles, parameters of the short piles are calculated to make sure that the requirements on the horizontal displacement, the bending capacity and the overturning resistance of the short piles are met and then parameters of the long piles are calculated to make sure that the requirement on the deep slide stability of the long piles is met. The construction method comprises the following main construction steps of constructing the long piles, constructing the short piles, constructing the concrete deep stirring pile curtain, hardening the ground before excavating a foundation pit, constructing a drainage facility, excavating the first layer of earth, constructing a pile top beam and the horizontal internal supports, excavating the second layer of earth, and performing the other steps until the earth is excavated to the bottom of the foundation pit.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit support engineering, in particular to a pile support structure with a combination of long and short piles and a single row of piles+horizontal internal support and a construction method thereof. Background technique [0002] In deep soft soil areas, especially those in Wuhan, in order to ensure the deep anti-sliding, overall stability, anti-uplift stability and anti-overturning requirements of the foundation pit, the foundation pit supporting piles need to pass through the deep soft soil and enter the underlying For stable strata with better performance, the pile length of the supporting pile is mainly determined by the buried depth of the stable stratum under the soft soil layer, and has little relationship with the excavation depth of the foundation pit itself. In this case, when the foundation pit is excavated When the depth is deepened, the support design generally only needs to ad...

AI Technical Summary

Problems solved by technology

The resulting result is: for a medium-depth foundation pit with an excavation depth of about 7-10m, the length of the supporting piles is more than 20m, or even more than 30 meters, which greatly increases the cost of foundation pit support and is extremely wasteful. The resources of the country and society run counter to the concept of low-carbon environmental protection advocated by the whole society today

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