Cast-in-situ bored pile with wall protected through microorganism soil solidification and construction method

Abstract

The invention relates to a cast-in-situ bored pile with the wall protected through microorganism soil solidification and a construction method. The construction method includes the steps that a, a hole is drilled through a drilling rig, and meanwhile microorganism bacterium liquid is injected into the drilled hole and diffused into a foundation around the drilled hole; b, a separation plate is placed into the drilled hole; c, a cementing solution is injected into the drilled hole and diffused into the foundation around the drilled hole and reacts with the microorganism bacterium liquid to generate calcium carbonate crystals, and soil around the drilled hole is solidified; d, after the separation plate sinks to the bottom of the hole, the separation plate is lifted out; and e, the step a, the step b, the step c and the step d are repeated until hole forming is completed. Mud is not used for protecting the wall in the construction process of the cast-in-situ bored pile with the wall protected through microorganism soil solidification, so that mud cakes and pollution are avoided, and pile side friction resistance is brought into full play; in addition, a microorganism solidified soil layer and a microorganism wall protecting cementing surface are formed by the reinforced soil around the pile and can not only prevent hole collapse but also bear loads in combination with the pile, and therefore the bearing capacity of the single pile is improved.

Description

technical field [0001] The invention relates to a microbial soil-fixing wall-protecting bored pile and a construction method thereof, which belong to the technical field of building construction. Background technique [0002] The stability of the hole wall during the construction of bored piles is the key factor to determine the pile quality and construction safety. However, the traditional mud retaining technology often causes partial hole collapse when passing through sandy soil and silty soil strata. As an emerging technology for soil stabilization, microbial grouting has the advantages of less construction disturbance, low pouring pressure, short construction period and good ecological compatibility. Compared with traditional cementitious materials, the grouting materials used also have low energy consumption and low pollution. As a new method of sustainable soil reinforcement, it has broad application prospects, and has increasingly attracted the attention of the geotec...

AI Technical Summary

Problems solved by technology

[0006] Industrial alum is added to the prepared mud. The aluminum contained in the alum pollutes the groundwater source and is very harmful to the human body, especially affecting the growth and intelligence of children. In addition, the mud only plays the role of balancing the earth pressure, protecting the wall and scum , the sand layer is not reinforced. When the sand layer is thick, the mud retaining wall cannot effectively reinforce the hole wall, which may easily cause partial collapse of the borehole. Injecting clean water to reduce the specific gravity of the mud will further increase the possibility of hole collapse. The mud skin formed on the surface of the pile hole side wall will become a weak shear interface between the pile body and the soil after the pile is formed, reducing the pile side frictional resistance. It is not conducive to the bearing capacity of pile foundation [Dong Zhigao, Dong Ping, Li Juncai, Zhang Zhicheng. Research on the influence of mud skin distribution on pile side of bored cast-in-situ piles on pile bearing properties[J]. Geological Hazards and Environmental Protection, 2010, 04: 94- 99.], the mud cannot play the role of solidifying the soil outside the hole

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