Microorganism soil-reinforcement cement fly-ash gravel (CFG) pile composite foundation and construction method

Abstract

The invention discloses a microorganism soil-reinforcement cement fly-ash gravel (CFG) pile composite foundation and a construction method. The construction method comprises the steps that a, a pile pipe is pressed into a foundation; b, microorganism bacterium liquid is injected into the pile pipe at the same time, and the microorganism bacterium liquid is made to diffuse towards the foundation around the pile pipe; c, the microorganism bacterium liquid is pumped out, and a cementing solution is injected into the pile pipe and made to diffuse to the foundation around the pile pipe and reacts with the microorganism bacterium liquid to generate calcium carbonate crystals, and incompact sandy soil or floury soil is cemented; d, the step b and the step c are executed repeatedly till the soil around the pile pipe meets the reinforcement requirement; e, pipe-drawing pile formation is conducted while cement-ash stabilized aggregates are poured; and f, a bed course is laid, so that the CFG pile composite foundation is formed. According to the microorganism soil-reinforcement CFG pile, the soil around the pile pipe is reinforced through calcium carbonate generated through reaction between the microorganism bacterium liquid and the cementing solution, so that the strength of the soil around the pile pipe is improved, and the quality problems of necking, pile breakage, soil carrying and the like in the pile forming process are solved; in addition, a reinforced soil body can be combined with a pile for bearing, and the bearing capacity of the single pile is effectively improved.

Description

technical field [0001] The invention relates to a microbial soil-fixing CFG pile composite foundation and a construction method, belonging to the technical field of building construction. Background technique [0002] CFG pile composite foundation is widely used in sandy soil, silt soil and muddy soil foundation due to its advantages of simple pile forming equipment, convenient construction and wide applicability. However, as a new technology for foundation treatment, microbial grouting has the advantages of small construction disturbance, low pouring pressure, long diffusion distance, short construction period and ecological compatibility. At the same time, compared with traditional cementitious materials, the grouting materials used also have the characteristics of low energy consumption, low pollution and low emissions. As a new method of sustainable soil reinforcement, it has broad application prospects and is It has increasingly attracted the attention of the geotechni...

AI Technical Summary

Problems solved by technology

[0010] The soil around the pile is not reinforced, and the bearing capacity of the soil between the piles is not improved. In addition, the speed of pulling out the tube at the junction of soft and hard soil layers is not controlled, or the concrete in the pile tube is less or less. Adding materials multiple times during the pile forming process can easily cause pile diameter shrinkage, mud inclusion, or even pile breakage, which seriously affects the bearing capacity of a single pile

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