Treatment method of coastal sludge soft soil foundation cement mixing pile

Abstract

The invention relates to a treatment method of a coastal sludge soft soil foundation cement mixing pile, which selects the adaptive portland slag cement as a modifier, adds a calcium lignosulphonate water-reducing agent and adopts the construction process of three times of spraying and six times of stirring for carrying out foundation reinforcement for the cement mixing pile. The doping amount ofthe portland slag cement is 20%, the water-cement ratio is not more than 0.45, the adding amount of the calcium lignosulphonate water-reducing agent is 0.25%, and the even stirring is carried out in ashort period of time. Slurry and the construction process can improve the characters of a clay foundation, in particular to sludge clay and the sludge foundation, and improve the piling quality of the cement mixing pile. The treatment method has the advantages of good piling quality and high strength, the strength of the cement mixing pile after piling can be improved by about 30%, and mineral products and wastes are comprehensively utilized, thereby protecting the environment, reducing the cost and having good economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for treating foundations with cement mixing piles, in particular to a method for treating cement mixing piles for muddy soft soil foundations along the coast. Background technique [0002] As we all know, at present, the muddy soft soil foundation treatment technology mainly adopts two ground treatment methods: powder spraying pile and cement mixing pile. Low-level problems; cement mixing piles are also a commonly used foundation reinforcement method. The construction method is generally two-spraying and four-stirring, one-way stirring, and ordinary Portland cement is used as a modifier. It has low pile strength and reinforcement The depth has certain limitations, and the quality of piles is difficult to guarantee. Especially in coastal areas rich in chloride ions and sulfate ions, it is easy to have a large amount of grout and the phenomenon that piles cannot be formed, which affects the effect of foundation treatment...

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Problems solved by technology

[0002] As we all know, at present, the muddy soft soil foundation treatment technology mainly adopts two foundation treatment methods: powder spraying pile and cement mixing pile. Low-level problems; cement mixing piles are also a commonly used foundation reinforcement method. The construction method is generally two-spraying and four-stirring, one-way stirring, and ordinary Portland cement is used as a modifier. It has low pile strength and reinforcement The depth has certain limitations, and the quality of the pile body is difficult to guarantee. Especially in coastal areas rich in chloride ions and sulfate ions, it is easy to have a large amount of grout and the phenomenon that piles cannot be formed, which affects the effect of foundation treatment.

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