Post-tensioned prestressing underground diaphragm wall and construction method

Abstract

The invention provides a post-tensioned prestressing underground diaphragm wall. A fixed end anchor plate of a fixed end anchor tool of the underground diaphragm wall is provided with a taper hole and matched with a fixed end clamping piece. A prestressing steel bar is anchored through wedge caulking of the taper hole. A fixed end anchor plate lower stress member is jointly formed by a fixed end anchor backing plate and a fixed end spiral bar. A tension end anchor tool comprises a tension end anchor plate, a tension end anchor backing plate, a tension end clamping piece and a tension end spiral bar. The prestressing steel bar penetrates through a corrugated pipe to be laid and fixed to a steel bar cage, and then the two ends of the prestressing steel bar are fixed to the fixed end anchor tool and the tension end anchor tool respectively, the periphery of the steel bar cage and the periphery of the corrugated pipe are filled with concrete to form the post-tensioned prestressing underground diaphragm wall. Meanwhile, the invention provides a construction method of the post-tensioned prestressing underground diaphragm wall. The post-tensioned prestressing underground diaphragm wall and the construction method of the post-tensioned prestressing underground diaphragm wall have the advantages that the section of the post-tensioned prestressing underground diaphragm wall is reduced by 15 %, the antiknock performance is increased by 20 %, the steel bars are reduced by 30 %, the consumption of concrete is reduced by 15 %, and the post-tensioned prestressing underground diaphragm wall conforms to the development trend of the modern building structure.

Description

technical field [0001] The invention relates to a ground connecting wall structure with high bearing capacity, high rigidity, strong crack resistance and less steel consumption, in particular to a post-tensioned prestressed underground continuous wall and a construction method. Background technique [0002] At present, the ground-connected wall structure is generally used in underground engineering and near-shore engineering fields such as housing construction, municipal administration, and ports, and is used as the main body or enclosure structure. The main construction steps of the traditional ground connection wall: 1) Use professional ground connection wall trough forming equipment to excavate the groove section; 2) Make the reinforcement cage; 3) Lift and lower the reinforcement cage; 4) Underwater pouring concrete; 5) Pile head chisel removal . According to this step, the construction of one piece of ground connection wall is completed, and each piece of ground connec...

AI Technical Summary

Problems solved by technology

[0007] If the ground connection wall continues to be constructed with the prestressed structure technology such as bridges and house buildings, some problems will arise: 1) After the prestressed reinforcement is laid, it needs to be hoisted to reach the predetermined position, and the prestressed reinforcement may occur during the lowering process. Local deformation or displacement will affect the force effect; 2) Concrete poured underwater is more difficult to control the quality of concrete than concrete poured on land, especially if the strength of the concrete near the prestressed fixed end and tension end is insufficient, it will seriously affect the subsequent Construction (that is, when the prestress is applied, the concrete at the fixed end or the tension end is broken); 3) Since the ground connection wall is buried underground, it is impossible to open vent holes on the side wall when grouting the tunnel like bridges, building construction and other prestressed structures

[0008] To sum up, when faced with the construction of large-scale foundation pits and deep-water sheet pile wharves, the traditional ground-connected wall structure has already experienced disadvantages such as high construction risk, high consumables, and high construction costs. The development of the ground-connected wall is no longer in line with my country's economical The development trend of modern and scientific and technological innovation-oriented society requires a new form of ground connection wall to achieve the coordination of its reliability, durability and economy

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