Composite foundation with discrete material pile restrained through microorganism soil solidification and construction method

Abstract

The invention relates to a composite foundation with a discrete material pile restrained through microorganism soil solidification and a construction method. The construction method includes the steps that a, a pile pipe is pressed into a foundation body; b, meanwhile, microorganism bacterium liquid is injected into a gap between an inner steel sleeve and an outer steel sleeve and diffused into the foundation body around the pile; c, the microorganism bacterium liquid is pumped out, a cementing solution is injected and diffused into the foundation body around the pile and reacts with the microorganism bacterium liquid to generate calcium carbonate crystals, and loose sandy soil or floury soil is cemented; d, the step b and the step c are repeated until the soil around the pile meets reinforcement requirements; e, discrete materials are poured into a hole of the inner steel sleeve; and f, a bed course is laid, so that the composite foundation is formed. According to the composite foundation with the discrete material pile restrained through microorganism soil solidification, the microorganism bacterium liquid and the cementing solution react to generate calcium carbonate so as to solidify the soil around the pile, so that the strength of the soil around the pile is improved, and the discrete material pile is protected against the problems of different pile diameters, bulging damage, pile hole caving and the like; the microorganism solidified soil and the pile can be combined to bear loads, and thus the bearing capacity of the single pile is improved.

Description

technical field [0001] The invention relates to a microbial soil-fixing constrained bulk material pile composite foundation and a construction method, belonging to the technical field of building construction. Background technique [0002] The bulk material pile has many advantages such as simple construction, fast speed, low cost, and good improvement effect, and the construction quality is often easier to guarantee than the cast-in-place cement pile. Problems such as bulging damage, stringing of piles, hole collapse, and diameter shrinkage affect its performance. In addition, for weak foundations, because the soil around the pile has poor constraints on the bulk materials, a large amount of bulk materials need to be put into the pile when forming the pile, which not only increases the As a new technology for foundation treatment, microbial grouting has the advantages of small construction disturbance, low filling pressure, strong permeability, controllable reaction rate an...

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Problems solved by technology

[0010] Geotextiles are used to constrain the bulk materials to form piles, and the soil around the piles is not reinforced. In the composite foundation formed, only the bearing capacity of the piles is improved, and the bearing capacity of the soil between the piles is not improved. In addition, the outer casing and the inner casing are pressed twice. Into the foundation, due to the narrow distance between the inner and outer pipes, the construction is difficult

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