Reinforcement piles for building foundations in collapsible loess areas and their construction methods

Abstract

The invention discloses a collapsible loess area building foundation reinforcing pile. The collapsible loess area building foundation reinforcing pile comprises an upper pile foundation, a lower pile foundation, an underpinning steel pipe and an operating pit. The lower end of the upper pile foundation is connected with the upper end of the lower pile foundation. The upper end of the upper pile foundation sequentially penetrates a self-weight collapsible loess layer and a lower backfill soil layer and stretches into a concrete bearing platform. The lower end of the underpinning steel pipe is connected with the upper pile foundation, the upper end of the underpinning steel pipe is connected with a building foundation, a pile foundation channel is formed in the self-weight collapsible loess layer, and a gap is formed between the upper pile foundation and the side wall of the pile foundation channel. According to the reinforcing pile, the influences of negative friction of the self-weight collapsible loess layer on the upper pile foundation can be effectively eliminated, and it is guaranteed that loads transmitted by the reinforcing pile are borne by friction between the lower pile foundation and a non-collapsible loess layer. The invention further discloses a pile pressing construction method. The method includes the steps of excavation of the operating pit; construction of the lower pile foundation; construction of the upper pile foundation; connection of the upper pile foundation and the building foundation; and construction of the concrete bearing platform. The pile pressing construction efficiency is improved through the pile pressing construction method.

Description

technical field [0001] The invention belongs to the technical field of building foundation reinforcement, and in particular relates to a building foundation reinforcement pile in a collapsible loess area and a pile pressing construction method thereof. Background technique [0002] At present, the main pile underpinning methods include static pressure piles, preloaded piles, anchor static pressure piles, driven piles, tree root piles, etc. Static pressure piles are most used in construction. The self-weight of the building is used as the counter force, and the original foundation beam or foundation slab is used to press the pile sections into the foundation section by section by hydraulic method, so as to play a role of reinforcement. [0003] Among them, the process of static pressure piles: excavate the operation pit 1 first, then install the pile tip, and then carry out pile pressure on the pile body 6 section by section, welding connection or connecting with sulfur morta...

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Problems solved by technology

[0004] The disadvantages and deficiencies of the method adopted in the prior art are: 1. When the pile body is in the self-weight collapsible loess layer, the side resistance of the pile body cannot be considered, and the pile body should penetrate the self-weight collapsible loess layer, and the pile body should penetrate the self-weight collapsible loess layer. The non-collapsible soil layer bears the upper load, and when the static pressure pile underpinning is used, when the self-weight of the upper structure is too small, the back pressure provided is insufficient, and it is difficult to penetrate the deep self-weight collapsible loess layer; 2. When the pile body In the self-weight collapsible loess layer, the loess soaks in water and collapses, causing negative friction resistance on the pile body, resulting in longer pile length pressed into the non-collapsible soil layer

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