Multi-layer horizontal connection double-row steel plate pile foundation pit support structure and construction method thereof

Abstract

The invention discloses a multi-layer horizontal connection double-row steel plate pile foundation pit support structure and a construction method thereof. The multi-layer horizontal connection double-row steel plate pile foundation pit support structure comprises a front-row steel plate pile, a rear-row steel plate pile, a front-row pile crown beam, a rear-row pile crown beam, a pile top connecting beam, steel strands, a surrounding purline and a ground tackle. The construction method comprises the steps that geometrical parameters of the front-row steel plate pile and the rear-row steel plate pile are selected, then the front-row steel plate pile, the rear-row steel plate pile, the front-row pile crown beam, the rear-row pile crown beam and the pile top connecting beam are constructed, the steel strands penetrate the surrounding purline and the anchor tackle for installation along with foundation pit layering excavation, prestress is applied, the multiple steel strands are used for anchoring, and the process is circularly conducted. The steel plate piles can be prefabricated and produced in an industrialized manner, the production speed is high, the pile body quality is stable, construction is convenient and fast, circular usage is achieved, and the multi-layer horizontal connection double-row steel plate pile foundation pit support structure is economical and environment-friendly. The support structure can block soil and stop water at the same time, a space statically indeterminate structure is formed through the front-row steel plate pile and the rear-row steel plate pile under the joint action of the pile top connecting beam, horizontal connection and soil between the piles, the overall rigidity is increased, the inner force and deformation of pile bodies can be obviously reduced, the inner force of the support structure can be automatically adjusted under the actions of complex and changeable water and soil pressure of a foundation pit and other loads, and the support structure can adapt to complex load conditions usually hard to predict and deeper foundation pit projects.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, and mainly relates to a multi-layer horizontally connected double-row steel sheet pile foundation pit support structure and a construction method thereof. Background technique [0002] In the actual foundation pit engineering, under the conditions of limited foundation pit site conditions, special environment around the foundation pit, and unsatisfactory construction conditions, anchor rods, soil nails, and internal supports are restricted and cannot be implemented, and single-row piles cannot meet the requirements. The foundation pit deformation and internal force requirements, or the use of single-row piles will significantly increase the cost, double-row pile support is an alternative form of foundation pit support structure. [0003] Looking back on the changes and engineering practice of the double-row pile support structure in the past few decades, a lot of valuable monitor...

AI Technical Summary

Problems solved by technology

[0004] Collecting domestic data on the use of double-row pile support structures in actual projects, it is found that the double-row pile system can only be connected at the top of the pile through ring beams and connecting beams. There is no connection between the piles, and the deformation of the front row of piles and the rear row of piles is uncoordinated. Generally, the deformation of the front row of piles is large, and the deformation of the rear row of piles is small. The ability to resist bending and deformation is not strong, and the applicable excavation depth generally does not exceed 9 meters. When the excavation depth of the foundation pit is greater, the double-row piles will no longer be applicable due to the displacement of the pile body and the excessive internal force of the pile body.

Images