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Anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on microbial grouting technology

An anti-floating anchor rod and advanced reinforcement technology, applied in soil protection, protection devices, infrastructure engineering and other directions, can solve problems such as hole collapse or hole forming difficulties, and achieve improved anchorage performance, high construction efficiency, and convenient operation. Effect

Inactive Publication Date: 2018-10-19
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, especially the problems of hole collapse or hole formation difficulties faced in the construction of anti-floating bolts in soft and loose rock and soil layers of deep foundation pits, and provide a method for microbial advanced reinforcement of retaining walls , using microbial slurry to reinforce the soil around the hole before the hole is formed, and the microbial slurry induces the microbial mineralization process after the hole is formed, so that the products of the mineralization process react with the cement (sand) slurry to further improve the anti-floating performance of the bolt , to increase the influence range of the anti-floating bolt reinforcement

Method used

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  • Anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on microbial grouting technology
  • Anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on microbial grouting technology
  • Anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on microbial grouting technology

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Effect test

Embodiment 1

[0021] The present embodiment is used to cultivate urease microorganisms in situ around the anti-floating anchor rod 2 drill hole retaining wall in the deep foundation pit 1 and includes the following steps:

[0022] (1) Yeast extract, ammonium chloride and urea are prepared into soil urease bacteria in situ culture solution with a pH value of 9.5, wherein the content of yeast extract is 2-40g / L, and the content of ammonium chloride is 1-10g / L , the urea content is 1-20g / L;

[0023] (2) The small advance grouting conduit 4 is manufactured by seamless steel pipe, and the front end of the small advance grouting conduit 4 is designed as a pointed structure 5, and a small advance grouting conduit 4 is provided every 1m along the depth direction on the wall of the small advance grouting conduit 4 The grouting hole 6, the grouting hole 6 is only set in half of the pipe wall, and is set on the pipe wall away from the anchor hole 7 and facing the soil 8 around the hole;

[0024] (3) ...

Embodiment 2

[0027] This embodiment is used for the anti-floating anchor rod 2 drilling retaining wall and grouting anchoring in the deep foundation pit 1, specifically including the following steps:

[0028](1) Yeast extract, ammonium chloride and urea are prepared into soil urease bacteria in situ culture solution with a pH value of 9.5, wherein the content of yeast extract is 2-40g / L, and the content of ammonium chloride is 1-10g / L , the urea content is 1-20g / L;

[0029] (2) The small advance grouting conduit 4 is manufactured by seamless steel pipe, and the front end of the small advance grouting conduit 4 is designed as a pointed structure 5, and a small advance grouting conduit 4 is provided every 1m along the depth direction on the wall of the small advance grouting conduit 4 The grouting hole 6, the grouting hole 6 is only set in half of the pipe wall, and is set on the pipe wall away from the anchor hole 7 and facing the soil 8 around the hole;

[0030] (3) 4-8 advance grouting s...

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Abstract

The invention belongs to the technical field of weak foundation reinforcement of geotechnical engineering, relates to an anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on a microbial grouting technology, wherein an in-situ bacterial culture scheme is adopted, in-situ excitation is carried out by utilizing naturally occurring soil urease bacteria in soil,and the characteristic bacterial culture medium is utilized to grow urease in soil to avoid the potential microbial hazards caused by introduction of microbial strains into soil from the outside; an advanced grouting process is adopted, the microbial culture medium is injected into surrounding soil before drilling, after the microbial in-situ culture is completed, a microbial mineralization process is started to enable the surrounding soil body to occur curing reaction, and after curing is completed, the drilling, grouting and anchoring work of the anti-floating anchor rods are performed in sequence, and the isolation plate need not be placed into the borehole; the construction cost is reduced, and the construction efficiency is improved. According anti-floating anchor rod advanced reinforcement drilling and wall protecting method based on a microbial grouting technology, the process is simple, convenient to operate, low in cost, practicability and construction efficiency is high, andthe anchoring performance of the anti-floating anchor rod is improved, while which can protect the underground water layer and the environment.

Description

Technical field: [0001] The invention belongs to the technical field of geotechnical engineering weak foundation reinforcement, and relates to an anti-floating anchor rod drilling wall and reinforcement method used in the soft and loose soil structure of deep foundation pit engineering, in particular to an anti-floating anchor rod drilling wall and reinforcement method based on microbial grouting technology. Floating bolt advanced reinforcement method for drilling wall protection. Background technique: [0002] With the acceleration of my country's urbanization process, the development of the national economy and the continuous improvement of people's living needs, the construction height of buildings above the ground and the depth of development and utilization of urban underground space are increasing. The accompanying problem is the excavation depth of foundation pits. and a significant increase in foundation burial depth. Due to the high groundwater level in the coastal ...

Claims

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Application Information

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IPC IPC(8): E02D3/11E02D31/12E02D5/74E02D15/00C12N1/20
CPCE02D3/11C12N1/20E02D5/74E02D15/00E02D31/12
Inventor 成亮张鹏
Owner JIANGSU UNIV
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