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Construction method of microbial stirring grouting pile

A construction method and grouting pile technology are applied in sheet pile walls, soil protection, infrastructure engineering and other directions to achieve the effects of improving material utilization, easy extubation, and avoiding high energy consumption.

Inactive Publication Date: 2019-08-16
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the invention is to solve the problem of the strength and uniformity of the microbial reinforcement foundation

Method used

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  • Construction method of microbial stirring grouting pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, a construction method of microbial stirring grouting pile is used to strengthen the silt foundation, the design pile length is 9.0m, and the pile diameter is 0.6m. The steps of the method are as follows:

[0027] a. According to the ratio of adding 100g nano-calcium sulfate in every L of bacterial liquid, the bacterial liquid and nano-calcium sulfate are mixed to make a suspension;

[0028] b. Stir the suspension prepared in step a into the foundation to be reinforced to form a closely arranged cylindrical bacteria-containing soil mixing zone 1, and the amount of the suspension is 1% of the pore volume of the bacteria-containing soil mixing zone 1 0.9 times;

[0029] c. Insert the grouting pipe 3 into the center of the sterile zone 2 between the cylindrical bacteria-containing soil bodies;

[0030] d. Inject the mixed solution of calcium chloride and urea into the foundation through the grouting pipe 3, and let it stand for 6 hours to make the solidifi...

Embodiment 2

[0035] In this example, a construction method of microbial stirring grouting pile is used to strengthen the silty clay foundation. The design pile length is 9.0m, and the pile diameter is 0.6m. The steps of the method are as follows:

[0036] a. According to the ratio of adding 165g nano-calcium sulfate in every L of bacterial liquid, the bacterial liquid is mixed with nano-calcium sulfate to make a suspension;

[0037] b. Stir the suspension prepared in step a into the foundation to be reinforced to form a closely arranged cylindrical bacteria-containing soil mixing zone 1, and the amount of the suspension is 1% of the pore volume of the bacteria-containing soil mixing zone 1 0.9 times;

[0038] c. Insert the grouting pipe 3 into the center of the sterile zone 2 between the cylindrical bacteria-containing soil bodies;

[0039] d. Inject the mixed solution of calcium chloride and urea into the foundation through the grouting pipe 3, and let it stand for 15 hours to make the s...

Embodiment 3

[0044] In this example, a construction method of microbial stirring grouting pile is used to strengthen the clay foundation, the design pile length is 9.0m, and the pile diameter is 0.6m. The steps of the method are as follows:

[0045] a. According to the ratio of adding 220g nano-calcium sulfate in every L of bacterial liquid, the bacterial liquid is mixed with nano-calcium sulfate to make a suspension;

[0046] b. Stir the suspension prepared in step a into the foundation to be reinforced to form a closely arranged cylindrical bacteria-containing soil mixing zone 1, and the amount of the suspension is 1% of the pore volume of the bacteria-containing soil mixing zone 1 0.9 times;

[0047] c. Insert the grouting pipe 3 into the center of the sterile zone 2 between the cylindrical bacteria-containing soil bodies;

[0048] d. Inject the mixed solution of calcium chloride and urea into the foundation through the grouting pipe 3, and let it stand for 24 hours to make the solidif...

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Abstract

The invention relates to a construction method of a microbial stirring grouting pile. The construction method solves the problems of strength and uniformity of a microbial reinforced foundation, and is characterized by comprising the following steps that a, according to the ratio of adding 100-220g of nano calcium sulphate per liter of bacterial solution, the bacterial solution is mixed with nanocalcium sulfate to prepare into a suspension; b, the suspension prepared in the step a is stirred into a foundation to be reinforced to prepare tightly arranged cylindrical bacterium-containing soil body stir zones 1, and the usage amount of the suspension is 0.9 time the pore volume of soil bodies of the bacterium-containing soil body stir zones 1; c, grouting pipes 3 are inserted into the centers of aseptic zones 2 between the cylindrical bacterium-containing soil bodies; d, a mixed solution of calcium chloride and urea is injected into the foundation through the grouting pipes 3 and standing is performed for 6-24h to form solidified pile bodies 4; and e, the step d is repeated for 4-8 times to complete construction of the microbial stirring grouting pile.

Description

technical field [0001] The invention relates to a construction method for improving the working performance of grouting piles through microbial grouting, and belongs to the technical field of foundation treatment. Background technique [0002] Compared with the traditional chemical soil consolidation technology, the microbial reinforcement technology is more environmentally friendly. Inject or mix the microorganisms and cementing solution into the loose soil. After the microorganisms induce the calcium carbonate to precipitate the cemented soil particles, a block, wall or single pile reinforcement will be formed in the foundation, which can effectively improve the bearing capacity of the foundation and reduce the settlement of the foundation. . Because of the compatibility between the individual size of microorganisms used for soil consolidation and the pores of the soil, currently the target of soil consolidation by microorganisms is mainly sandy soil, and the reinforcemen...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D5/46
CPCE02D3/12E02D5/46
Inventor 邵光辉李中义蒋咏峻
Owner NANJING FORESTRY UNIV
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