Technical method for improving quality of deep cement soil mixing piles using compressed air foam

Abstract

The invention provides a technical method for improving quality of deep cement soil mixing piles using compressed air foam, and on the basis of a 'guniting-stirring' technology in conventional deep cement soil mixing pile machine, a foam injection system is added. Cement grout and the compressed air foam pass through a double-channel rotating joint and a double-channel drill stem and are finally ejected into soil simultaneously through a nozzle in the side face of a drill. The compressed air foam assists the guniting and the stirring of the cement mixing drill, on one hand stirring resistance of the drill in a sand soil layer is reduced, on the other hand, drill adhesion in cohesive soil is reduced. According to the technical method, cement adding amount and uniformity of the stirring can be guaranteed, so that the quality of the cement soil mixing piles is improved.

Description

technical field [0001] The invention belongs to the improvement of deep cement mixing pile construction machinery in the field of civil engineering foundation treatment, and in particular relates to a technical method for improving the quality of deep cement soil mixing piles by using compressed air foam. Background technique [0002] Cement-soil deep mixing pile is a method for strengthening soft soil foundation. It uses cement as a curing agent, and through a special mixing machine and a slurry pump, the soft soil and curing agent are forced to mix and mix in the depth of the foundation. A series of physical and chemical reactions between the agent and the soil make the cement soil harden into a composite foundation with integrity, water stability and high foundation bearing capacity. [0003] The disadvantage of the cement-soil mixing pile is that the construction quality is not easy to guarantee, especially in the following two soil layers, the construction is difficult ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of cement-soil mixing piles is that the construction quality is not easy to guarantee, especially in the following two soil layers, the construction is difficult and there are many quality problems

One is the relatively dense sandy soil layer. Due to its large internal friction angle, the resistance of the drill bit rotation is relatively large, resulting in overloading of the motor and difficult construction.

In the highly plastic clay layer, the phenomenon of clay sticking to the drill bit to form inclusions often occurs, resulting in difficulty in cement mixing and poor mixing uniformity, which affects the quality of cement mixing piles

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