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

Active Publication Date: 2014-10-15
JIANGSU DINGDA BUILDING NEW TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, SMW construction method piles have the following disadvantages: H-shaped steel is mostly used in SMW construction method piles, and the cost of H-shaped steel is high. In the actual construction process, the transportation cost and leasing cost of the section steel are very high, especially when the construction period is long. , the rental cost of section steel will greatly increase the cost of use
In addition, the section steel generally needs to be pulled out after the construction of the basement is completed, which may lead to the loss of the section steel such as bending and b

Method used

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  • Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall
  • Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall
  • Cast-in-place externally prestressed concrete-filled steel pipe pile and construction method thereof and support pile wall

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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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Abstract

The invention discloses a cast-in-place externally prestressed concrete-filled steel pipe pile, which comprises a steel pipe, a concrete layer cast-in-place in the steel pipe and multiple prestressed tendons arranged on the steel pipe, wherein the prestressed tendons are arranged along the direction of the axis of the steel pipe, and comprise top sections, middle sections and bottom sections; the middle sections are positioned outside the steel pipe; the top sections and the bottom sections penetrate through the wall of the steel pipe and enter into the steel pipe; the upper end of the steel pipe is opened, and the bottom end of the steel pipe is provided with a sealed structure. The invention also provides a construction method of the concrete-filled steel pipe pile and a support pile wall with the concrete-filled steel pipe pile. In the way, the external prestressing technology is adopted by the cast-in-place externally prestressed concrete-filled steel pipe pile, a pile body can be restrained better, the tensile resistance is provided, and deformation of the support pile wall in the excavation process of a foundation pit is effectively limited; in addition, field fabrication can be performed, transport costs are reduced, on the premise of guaranteeing safety and reliability of a foundation pit support, the cost is reduced, the construction period is shortened, and construction is convenient.

Description

[0001] technical field [0002] The invention relates to all construction engineering fields such as construction, municipal administration, transportation, water conservancy, electric power, industry, etc., and in particular relates to a cast-in-place external prestressed steel pipe concrete pile, a construction method thereof and a supporting pile wall. Background technique [0003] The technical scheme of foundation pit engineering is mainly considered from the aspects of safety reliability, economic rationality, construction difficulty and construction period. There are many applications of SMW construction method piles, cast-in-place piles and underground diaphragm walls in soft soil areas around the coast of my country. [0004] The steel-cement-soil mixing wall, commonly referred to as the SMW construction method, is a composite soil-retaining and water-proof structure formed by inserting section steel into continuously socketed three-axis cement-soil mixing piles. T...

Claims

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Application Information

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IPC IPC(8): E02D5/22E02D5/46E02D5/60
Inventor 徐汉东滕坤周俊杰符新军陈浩锋王燕赵迁李莉曹亚强
Owner JIANGSU DINGDA BUILDING NEW TECH
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