Prestressed concrete pile with recoverable steel strands and construction method

Abstract

The invention provides a prestressed concrete pile with recoverable steel strands and construction method. The prestressed concrete pile comprises a concrete pile body, multiple vertical twisted steel ribs, multiple single-row type prestressed ribs, helical ribs, multiple outer ground tackles and multiple inner ground tackles, wherein the concrete pile body is of a cylindrical concrete structure. The multiple vertical twisted steel ribs and the multiple prestressed ribs are arranged along the periphery of the concrete pile body. The helical ribs are arranged on out sides of the vertical twisted steel ribs and the prestressed ribs in a colligation or welding mode. The inner ground tackles and the outer ground tackles are respectively installed at the lower end and the upper end of each steel strand. The prestressed concrete pile has the advantages that the cross section of the prestressed concrete pile is large in anti-bending rigidity and anti-bending bearing capacity, inward horizontal deformation of the prestressed concrete pile and sedimentation of a building can be reduced, the diameter of the cross section of the pile can be reduced, and the steel strands can be recycled, and resources are saved, so that the prestressed concrete pile saves resources, reduces construction cost of engineering, and is environmental-friendly.

Description

technical field [0001] The invention belongs to the technical field of foundation pit enclosure engineering in underground space, and in particular relates to a prestressed concrete pile equipped with recyclable steel strands and a construction method. Background technique [0002] Under the action of bending moment in reinforced concrete structure, the concrete on the tensile side of the structure will crack. If the crack width is limited within the allowable 0.2-0.25mm, the tensile stress of the steel bar can only reach 150-250MPa, which makes the high-strength steel bar in It cannot fully play its role in reinforced concrete structures, and it is also impossible to play the role of high-strength concrete. Moreover, for the reinforced concrete structure with cracks, the concrete material in the tension zone cannot fully play its role, and the structural rigidity drops greatly. High-strength steel bars and high-strength concrete have a high cost performance. [0003] At p...

AI Technical Summary

Problems solved by technology

Due to the low tensile strength of steel bars, the amount of steel bars is large, and the steel bars are not recyclable; in addition, under the action of soil pressure, the concrete on the tensile side of the reinforced concrete pile will produce cracks, and the section bending stiffness of the reinforced concrete pile with cracks Therefore, when the geological conditions of the site are poor and the environmental protection requirements around the foundation pit are strict, it is usually necessary to use reinforced concrete piles with larger diameters and more reinforcements so that the reinforced concrete piles have sufficient bearing capacity. In order to ensure the construction safety of the underground structure and the ground settlement around the foundation pit can be controlled within the allowable range, this will undoubtedly increase the project cost

[0004] Chinese patent application No. 201210245291.1 discloses a foundation pit enclosure structure with prestressed tendons on the vertical retaining structure and its construction method. Since the bottom of the prestressed tendons in the foundation pit enclosure structure is U-shaped, and No anchors are installed, so the recovery of prestressed tendons requires a large pull-out force, so the construction is difficult

[0005] Chinese patent application No. 200420029700.5 discloses a concrete cast-in-place pile using steel rods for prestressed concrete. The difference between this concrete cast-in-place pile and ordinary concrete piles is that steel rods for prestressed concrete are used. Since no prestress is applied to the steel rods , so the anti-cracking and tensile properties of the pile have not been improved, and the steel rods are not recyclable

[0006] Disclosed in Chinese patent application No. 01253503.6, 03113753.9, 01126590.6 and 200410081456.1 a variety of prestressed concrete piles and construction methods, but its common shortcoming is that the prestressed tendons on it are not recyclable

Images