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

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...

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 breaking, and will greatly increase the project cost when the site limit cannot be pulled out.

[0006] Cast-in-situ piles use a lot of steel bars and concrete, and additional water-stop curtains need to be installed. The construction is cumbersome and has a relatively large impact on the environment.

[0007] Therefore, the supporting structure used in the existing building foundation pit engineering can not fully meet the engineering needs, and it is necessary to develop a new type of foundation pit supporting structure, which is safe, reliable, economical and reasonable, and convenient for construction.

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