A kind of microbiological soil-fixing wall-retaining bored pile and its construction method

Abstract

A microbial soil-fixing wall-retaining bored pile and its construction method, the steps include: a. drilling with a drilling rig, and injecting microbial liquid into the borehole at the same time, so that the microbial liquid spreads to the foundation around the borehole; b. putting the isolation plate into Drilling; c. Inject cementing solution into the drilling, so that the cementing solution diffuses to the foundation around the drilling, and reacts with microbial bacteria liquid to produce calcium carbonate crystals, solidifying the soil around the drilling; d. Wait for the isolation plate to sink to the hole After the bottom, the isolation board is raised; e. Repeat steps a, b, c, and d until the hole is completed; the microbial soil-fixing wall retaining bored pile does not use mud wall during the construction process, no mud skin, no pollution, pile side friction The resistance is fully exerted, and the reinforced soil around the pile forms a microbial soil-fixing layer and a microbial retaining wall cementation surface, which not only prevents the hole from collapsing, but also carries the joint load with the pile to improve the bearing capacity of the single pile.

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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