Device for reinforcing foundation through microbial ultrasonic grouting and construction method thereof

Abstract

The invention discloses a device for reinforcing a foundation through microbial ultrasonic grouting and a construction method thereof. The device comprises a grouting pipe, the upper side of the grouting pipe is connected with an ultrasonic energy concentrator, the ultrasonic energy concentrator comprises an ultrasonic amplitude transformer and an ultrasonic transducer, the ultrasonic transducer is connected with the upper end of the ultrasonic amplitude transformer and the upper end of the grouting pipe, a pulse generator is arranged at the bottom of a grouting hole, an ultrasonic sensor is arranged on the ground on one side of the grouting pipe, the ultrasonic sensor is connected with an oscilloscope, the upper end of the grouting pipe is connected with a grout inlet pipe, the grout inlet pipe is connected with two grout inlet barrels through a grouting pump, and the two grout inlet barrels are filled with bacterial liquid and cementation solution respectively. According to the device, the reinforcement uniformity can be improved, deeper soil bodies can be reinforced, grout can be diffused to the periphery from the grouting pipe with holes in the pipe wall in cooperation with the ultrasonic effect, the reinforcement range is larger, the integrity is higher, the reinforcement uniformity is guaranteed, and the applicable soil body types are wide.

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...

AI Technical Summary

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 with 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-in 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

Images