A device and construction method for strengthening foundation by microbial ultrasonic grouting

Abstract

The invention discloses a device for strengthening foundation by microbial ultrasonic grouting and a construction method thereof. The device includes a grouting pipe, and an ultrasonic concentrator is connected to the upper side of the grouting pipe. The ultrasonic concentrator includes an ultrasonic horn and an ultrasonic transducer. Connection, the bottom of the grouting hole is equipped with a pulse generator, the ground on one side of the grouting pipe is equipped with an ultrasonic sensor, the ultrasonic sensor is connected to the oscilloscope, the upper end of the grouting pipe is connected to the grouting pipe, and the grouting pipe passes the grouting pump It is connected with two pulp feeding barrels, and the two pulp feeding barrels are respectively filled with bacteria solution and cementing solution. The invention can improve the uniformity of reinforcement, and can reinforce the soil in deeper layers. The grout can be diffused from the grouting pipe with holes in the pipe wall to the surroundings in cooperation with the action of ultrasonic waves. The reinforcement range is larger, the integrity is higher, and the uniformity of reinforcement is ensured. , applicable to a wide range of soil types.

Description

technical field [0001] The invention relates to the technical field of grouting foundation reinforcement, in particular to a device and a construction method for microorganism ultrasonic grouting reinforcement foundation. Background technique [0002] Microbial grouting reinforcement technology is a new type of foundation reinforcement method in recent years. It pours microbial bacteria liquid and nutrient salt into the soil, and uses microbial mineralization to quickly gel into calcium carbonate crystals between soil particles, thereby strengthening the soil. Improve the mechanical properties of the soil and improve the strength and stiffness of the soil. Compared with traditional cement slurry and ordinary chemical slurry, this technology has the advantages of low energy consumption, less pollution, and ecological protection. [0003] In 2010, the Delft University of Technology in the Netherlands first applied microbial grouting reinforcement technology to the stabilizati...

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Problems solved by technology

However, the current microbial grouting reinforcement technology is mostly used to reinforce gravel soil with high permeability, and there are few large-scale engineering applications.

[0004] The main problems faced by this technology in practical engineering are: when microbial grouting strengthens the foundation, due to the uneven adsorption of soil particles on microorganisms and the uneven mineralization reaction, the calcium carbonate generated by microbial mineralization is in the soil. The distribution will also be uneven; for low-permeability soils, due to the compatibility between microorganisms and soil pores and the slow flow of solutions, the current microbial grouting technology is not effective in dealing with low-permeability soils; The solution tends to remain on the pipe wall during grouting, which can easily cause blockage of the grouting pipe; microbial reinforcement is a complex biochemical process, which requires real-time monitoring of the reinforcement process and effect

[0005] Prior to the present invention, the patent "A Method for Microbiological Circulation Grouting to Strengthen the Foundation (Authorized Publication No. CN105350517 B)" disclosed a method of combining microbial liquid and cementing solution, alternating positive and negative cycles, and orthogonal streamlines. This method overcomes the problems of difficult slurry injection, uneven reinforcement, small effective radius of reinforcement, and low utilization rate of slurry materials, but the method is complicated to operate, consumes a lot of energy, and will have a certain impact on the surrounding groundwater

The patent "ultrasonic atomization press-in machine for low-permeability soil microbial reinforcement and its construction method (application publication number CN 110593249 A)" discloses a low-permeability soil microbe-reinforced ultrasonic atomization press machine for microbial reinforcement engineering and its construction method, which atomizes and pressurizes the microbial solidification slurry into the reinforced soil, solves the problem of large-area construction on the surface of low-permeability soil, and improves the construction efficiency, but this method is mainly applicable to The reinforcement of shallow soil cannot solve the reinforcement of deep soil, and the effect of reinforcement cannot be monitored

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