A ground treatment method

Abstract

The invention provides a foundation treatment method which is convenient to construct and capable of treating a deep foundation exceeding 15m. The foundation treatment method concretely comprises the following steps of (1) simultaneously sinking a pipe, namely sinking a steel pipe and a pile tip supporting against the lower end surface of the steel pipe under the ground by using a vibratory pile driver and extractor, enabling the lower end surface of the steel pipe to reach up to the designed elevation, and sealing the lower end of the steel pipe by the pile tip; (2) placing a grouting pipe into the steel pipe, and enabling the bottom of the grouting pipe to reach to the pile tip; (3) manufacturing an expanded head; (4) further filling the steel pipe with pure soil and / or construction wastes, and tamping; (5) repeating the step (4) until the pure soil and / or the construction wastes reach to the top of the steel pipe and are compacted; (6) grouting, namely injecting cement slurry into the expanded head and the steel pipe through the grouting pipe, and upwards lifting the grouting pipe while grouting until the whole steel pipe is full of the cement slurry; (7) removing the steel pipe after ending grouting to form a support pile; and (8) paving a mattress layer at the top of the support pile.

Description

technical field [0001] The invention relates to a treatment method applicable to deep foundations. Background technique [0002] There are many methods for foundation treatment, especially for deep foundation treatment. At present, there are mainly soil and lime soil pile compaction methods, cement fly ash gravel piles and deep mixing piles and other foundation treatment methods, as well as carriers derived from the above foundation treatment methods. Ground treatment methods such as pile method and rammed and expanded garbage pile method. [0003] Among them, the soil and lime soil pile compaction method is mainly used to deal with collapsible loess above the groundwater level, plain fill and miscellaneous fill, etc., and is composed of compacted soil between piles and rammed piles. For composite foundation, when the main purpose is to eliminate the collapsibility of the foundation, soil piles should be used; when the main purpose is to improve the bearing capacity or wate...

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned foundation treatment methods are used in different foundation treatments, and each has its own advantages, but it has a common disadvantage, that is, during the construction process of these foundation treatment methods, the materials of the pile body will spread into the soil, and the pile body will The diameter of the pile is not easy to control, and the bearing capacity of the piles varies greatly, which makes the maximum treatment depth of these foundation treatment methods generally controlled within 15 meters. There is currently no economical and effective method for the treatment of deep foundations exceeding 15 meters. Approach

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