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A microbial flat grouting device and method for strengthening liquefiable foundations

A grouting device and liquefied foundation technology, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of difficult control of the reinforcement range and uneven strength of the reinforcement body, so as to improve the overall anti-liquefaction ability and eliminate the size effect problem, the effect of improving non-uniformity

Active Publication Date: 2017-06-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Problems in the existing technology: The object of the existing MICP grouting reinforcement technology is mainly sandy soil, and there are generally problems of uneven strength of the reinforced body and difficult control of the reinforcement range. The smaller the particle size of the soil, the more prominent the problem

Method used

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  • A microbial flat grouting device and method for strengthening liquefiable foundations
  • A microbial flat grouting device and method for strengthening liquefiable foundations
  • A microbial flat grouting device and method for strengthening liquefiable foundations

Examples

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Effect test

Embodiment 1

[0030] The plane size of a construction site: 72m in length and 60m in width, the content of soil particles with a particle size greater than 0.25mm in the site is 78.3%, which exceeds 50% of the total weight. According to the standard of solid body classification, the foundation soil of this site belongs to liquefiable medium sand, and it is necessary to take anti-liquefaction treatment measures to strengthen the foundation of the site. The thickness of the foundation soil layer to be reinforced is 4.3m~4.9m. figure 1 -6 and this engineering case further illustrate the present invention.

[0031]The microbial flat plate grouting device proposed by the present invention is composed of a stainless steel grouting plate 1, a pipeline transfer device 2, an extension plate 3 and a grouting pipe 4. The surface of the device is in the Evenly apply lubricating grease to the depth of the soil to facilitate the device to be pulled out from the soil layer after the grouting is completed;...

Embodiment 2

[0038] In this example, the present invention is used to strengthen the silt foundation with a plane size of 60m in length and 60m in width, and the thickness of the foundation soil layer to be reinforced is 4.1m~4.4m, combined below figure 1 -6 and this engineering case further illustrate the present invention.

[0039] The microbial flat plate grouting device proposed by the present invention is composed of a stainless steel grouting plate 1, a pipeline transfer device 2, an extension plate 3 and a grouting pipe 4. The surface of the device is in the Evenly apply lubricating grease to the depth of the soil to facilitate the device to be pulled out from the soil layer after the grouting is completed; the grouting plate 1 is 1160mm long, 40mm thick, and 1500mm high. The front end of the grouting plate 1 is processed into a 12° edge angle 5 to facilitate To break the soil, a Ф32mm slurry channel 6 is drilled along the height direction at the part above the blade angle 5, and a ...

Embodiment 3

[0046] The plane size of a construction site is 120m in length and 96m in width. The content of soil particles with a particle size greater than 0.1mm in the site is 80.2%, which exceeds 75% of the total weight. According to the standard of solid body classification, the foundation soil of this site belongs to liquefiable fine sand, and anti-liquefaction treatment measures need to be taken to strengthen the site foundation. The thickness of the foundation soil layer to be reinforced is 4.8m~5.3m. Combine below figure 1 -6 and this engineering case further illustrate the present invention.

[0047] The microbial flat plate grouting device proposed by the present invention is composed of a stainless steel grouting plate 1, a pipeline transfer device 2, an extension plate 3 and a grouting pipe 4. The surface of the device is in the Evenly apply lubricating grease to the depth of the soil to facilitate the device to be pulled out from the soil layer after the grouting is complete...

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Abstract

A microbial plate grouting device and method for strengthening liquefiable foundations, the device includes a grouting plate, a pipeline transfer device, an extension plate and a grouting pipe; steps of the grouting method: a. The microbial flat grouting device arranged in the form is vertically driven into the stratum to be reinforced; b. one end of the first and second grouting pipes are respectively docked with the first and second grout channels in the microbial flat grouting device, and the first injection The other end of the grouting pipe is connected with the valve, the grouting pump, and the urease-producing bacteria liquid storage tank in turn, and the other end of the second grouting pipe is connected with the valve, the grouting pump, and the cementing solution storage tank in turn; c. Open the valve Grouting the stratum with the grouting pump. During the grouting process, the microbial flat grouting device is evenly lifted up. After the grouting is completed, all the microbial flat grouting devices on the site are pulled out and left to stand for 12 hours. Finally, the groundwater is extracted for sewage treatment. Compared with the prior art, the invention simplifies the process, shortens the construction period and eliminates the problem of size effect.

Description

technical field [0001] The invention relates to a microbial plate grouting device and method for reinforcing liquefiable foundations, belonging to the technical field of foundation treatment. Background technique [0002] The sand or silt in the saturated state will liquefy when subjected to vibration, which will cause the foundation to lose its bearing capacity, which may cause many engineering disasters related to liquefaction, such as roadbed subsidence, pile foundation bending and shear failure, underground pipelines and tunnels. Diseases such as slope instability and excessive erosion of coasts or river banks seriously threaten people's lives and property safety. Anti-liquefaction treatment and reinforcement of liquefiable foundations have always been important technologies in the field of foundation treatment. [0003] The traditional method of liquefied foundation improvement is mainly to slow down the damage caused by liquefied foundation by inhibiting the accumulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D15/00
CPCE02D3/12E02D15/00
Inventor 邵光辉黄容聘朱哲赵志峰刘鹏郭梦醒
Owner NANJING FORESTRY UNIV
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