Micro-steel pipe pile and grouting reinforcement method

Abstract

The invention provides a miniature steel pipe pile and a grouting reinforcement method. The miniature steel pipe pile comprises a steel pipe pile body; a pile tip sealing plate is connected to the lowermost end of the steel pipe pile body and provided with a grout discharge hole communicating with the inner side of the steel pipe pile body and a soil layer on the periphery of a pile tip; reinforcement treatment is conducted on a soil layer under the pile tip through two times of grouting; the characteristics of being good in automatic flow performance, quick in hardening, early in strengthening, free of shrinkage, slight in expansion and the like of grouting materials are utilized, the bearing capacity of a foundation can be improved quickly and effectively, and accordingly the bearing capacity of the pile tip is improved; and mixing of cement paste and the grouting materials is effectively prevented through a rubber plug in an inverted circular truncated cone shape, and the strength of the grouting materials at the pile tip is ensured.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a miniature steel pipe pile and a grouting reinforcement method. Background technique [0002] Micro steel pipe pile is a kind of steel pile, which has the advantages of high material strength, strong ability to be implanted into the soil layer, little impact of pile sinking on soil, light pile pressing equipment, convenient connection, etc., and is widely used in engineering construction and reinforcement . However, due to its small diameter, small surface area around the pile, and small friction with the soil, the vertical bearing capacity of the micro-steel pipe single pile is limited. , most of which have grout holes on the steel pipe pile body, such as the grouting type micro steel pipe pile and the grouting reinforcement method disclosed in the Chinese invention patent CN102493437A, the grouting type micro steel pipe pile includes a steel pipe,...

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Problems solved by technology

[0004] Concrete: The diameter of the particles in the concrete is relatively large, and the pile body needs to be opened with relatively large holes, which greatly weakens the section of the steel pipe pile. Although the concrete has a certain fluidity, it is difficult to construct and realize when it is used in a small diameter steel pipe. pressure grouting;

[0005] Cement slurry: Cement slurry has good fluidity and strong penetration ability, and it is easy to realize pressure grouting, but the hardening speed after grouting is slow, and it is easy to form a connector between adjacent piles in the peripheral area of ​​the grouted steel pipe. The effect is often not as expected;

[0006] Chemical pulp: chemical pulp is in a solution state and has good injectability, but its price is relatively expensive, and it has a certain pollution risk to the foundation soil and water quality

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