Prestressed double-casing assembly type foundation pit enclosure structure and construction method thereof

By using a prestressed double-casing prefabricated foundation pit retaining structure, which utilizes precast piles, pile top casings, outer casings, and unbonded prestressed tendons, combined with composite steel support beams and end-bearing beam composite slabs, the problems of long construction cycle, poor quality stability, and high leakage risk of traditional deep foundation pit retaining structures are solved, thus achieving efficient and safe foundation pit engineering construction.

CN122327718APending Publication Date: 2026-07-03IANGSU COLLEGE OF ENG & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IANGSU COLLEGE OF ENG & TECH
Filing Date
2026-06-03
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional deep foundation pit retaining structures suffer from long construction cycles, large amounts of wet work, poor quality stability, insufficient reliability of node connections, poor force transmission, and difficulty in controlling assembly precision. They are prone to safety hazards such as leakage and instability, making it difficult to meet the requirements of safe, efficient, and green construction for deep foundation pit projects.

Method used

The prestressed double-casing prefabricated foundation pit retaining structure is adopted, which includes precast piles, pile top casings and outer casings. Unbonded prestressed tendons are installed between the two. Combined with composite steel support beams and end-bearing beam composite plates, a closed structure is formed by high-strength bolt connection and high-pressure grouting to achieve continuous top restraint and active prestressing, thereby improving the overall stiffness and resistance to lateral displacement.

Benefits of technology

It significantly improves the overall stiffness and lateral displacement resistance of the retaining structure, controls the deformation of the top of the foundation pit retaining structure, improves construction accuracy and efficiency, enhances safety and durability, reduces leakage risk, and meets the safety and efficiency construction requirements of deep foundation pit projects.

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    Figure CN122327718A_ABST
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Abstract

The application discloses a prestressed double-casing assembly type foundation pit support structure and a construction method thereof, and the structure comprises a prefabricated pile, a pile top casing and an outer casing, the pile top casing is arranged at the top of the prefabricated pile, the outer casing is arranged inside a foundation pit soil layer and outside the pile top casing, unbonded prestressed tendons are arranged between the pile top casing and the outer casing, and a pit top slope surface layer is arranged on the top of the pile top casing. A combined plate with an end bearing beam and a combined steel support beam are arranged between adjacent prefabricated piles and staggered from top to bottom; fine stone concrete is poured between the combined plate with the end bearing beam and the outer soil layer of the foundation pit, and anchor rods are arranged on the combined plate with the end bearing beam and penetrate into the inside of the outer soil layer of the foundation pit, so that the technical effects of "closed cast-in-situ reinforced concrete pile top casing controlling top deformation, support type outer casing combining with a prestressed tendon to strengthen a force system, combined steel support beam assisting overall collaborative bearing of each part and considering water stopping effect, and wave type staggered anchor rod group strengthening bearing capacity of the support structure" are realized.
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