Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall
A technology of steel pipe concrete piles and external prestressing, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., and can solve the problem of large amount of steel bars and concrete in cast-in-situ piles, high transportation and leasing costs of section steel, and increased use costs of section steel, etc. problems, achieve good economic benefits, avoid removal loss, and reduce transportation costs
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[0040] Example one:
[0041] See figure 1 , figure 2 with Figure 5 , A cast-in-place externally prestressed concrete-filled steel pipe pile, comprising: a steel pipe 1, a concrete layer 2 cast in-situ inside the steel pipe 1, and a plurality of pre-stressed tendons 3 arranged on the steel pipe 1. The prestressing tendons are arranged along the axis of the steel pipe 1, including a top section 31, a middle section 32 and a bottom section 33. The middle section 32 is located outside the steel pipe 1. The top section 31 and the bottom section 33 penetrate the steel pipe wall and enter the inside of the steel pipe. The bottom section 33 extends into the concrete layer 2 and is tightly combined with the concrete layer 2. The top section 31 is partially combined with the concrete layer 2, and there is a part of the concrete layer 2 exposed. After the body reaches the design strength, the external prestress is applied to the prestressed tendons. The present invention adopts the extern...
Example Embodiment
[0052] Embodiment two:
[0053] The second embodiment of the present invention is basically the same as the first embodiment. The main difference is that the middle section of the prestressed tendons is wrapped with a protective sleeve, and both ends of the protective sleeve are connected to the upper and lower through holes respectively. The holes are matched and sealed with a sealing ring. In this embodiment, a protective sleeve is added to the outside of the middle section. The protective sleeve can be a plastic tube, which can protect the prestressed tendons from external water erosion and fully ensure the prestress The high strength and performance of the stress bars.
[0054] In addition, there are the following differences. In this embodiment, the distance between the upper through hole and the upper end surface of the steel pipe is 2m, and the structural design is reasonable to ensure the smooth progress of the external prestressing. A plurality of upper through holes are ...
Example Embodiment
[0055] Example three:
[0056] Reference image 3 with Image 6 , The third embodiment of the present invention is basically the same as the first embodiment, the main difference is: the prestressed tendons have 2 to 6 ( image 3 Shown in the figure are 6), divided into two groups, the two groups of prestressed tendons are symmetrically arranged, each group of 1~3 prestressed tendons are close together to form a whole, the structure is simple, and the design is reasonable.
[0057] In addition, there are the following differences. In this embodiment, the distance between the upper through hole and the upper end surface of the steel pipe is 3m, and the structural design is reasonable to ensure the smooth progress of the external prestressing. A plurality of upper through holes are symmetrically arranged.
[0058] In addition, there are the following differences. This embodiment provides a supporting pile wall with the above-mentioned cast-in-place externally prestressed steel tube con...
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