A Construction Method for Improving the Integrity and Lateral Rigidity of Double-row Support Pile in Foundation Pit

Abstract

The invention discloses a construction method for improving integrity and lateral rigidity of double-row supporting piles of a foundation pit. The detailed steps include that 1, after the supporting piles are constructed according to conventional process, a bellows, a front cover of the bellows, a rear cover of the bellows, a bellows outer reinforcement cage, a support reinforcement steel bar, an opening reinforcement steel bar and the like are bound together to be formed during manufacture of a supporting pile body reinforcement cage; 2, the foundation pit is dug to a bottom elevation position of a first channel of vertical support; 3, a front bellows and a rear bellows are drilled; 4, a temporary steep pipe protective wall cylinder is inserted; 5, the vertical supporting reinforcement cage is manufactured and placed, then concrete is poured by using horizontal pressure while the steel pipe protective wall cylinder is drawn out; 6, when the first channel of the vertical support meets a requirement, the foundation pit is dug continuously to a bottom elevation position of a second channel of vertical support; and 7, the step 3 to the step 6 are repeated, after all vertical supports are finished, foundation pit digging is finished. By means of the construction method, the integrity and the lateral rigidity of the double-row supporting piles are remarkably improved, bending moment borne by the supporting piles is reduced, and high cost performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a construction method for improving the integrity and lateral stiffness of double-row support piles in foundation pits. Background technique [0002] At present, the development and utilization of underground space is becoming more and more intensive, and foundation pit engineering is becoming more and more important. In the foundation pit support structure, the cantilever pile row support is very common, but it is not suitable for foundation pits with large excavation depths. For example, the excavation depth in soft soil sites should not be greater than 5m, which is barely enough for a basement depth. Similarly, the cantilever-type pile support is not suitable for use when the horizontal displacement control of the soil around the foundation pit is required to be high. The main reason is that the lateral stiffness of the cantilever-type pile row i...

AI Technical Summary

Problems solved by technology

However, because the double-row piles are structures buried below the ground, and the piles are surrounded by soil, it is difficult to construct the longitudinal support between the piles after emptying the soil between the piles. The pile support technology can only meet the integrity and lateral rigidity of the support structure required by the design by simply increasing the diameter of the pile body.

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