CN115247420A - Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof - Google Patents
Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof Download PDFInfo
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- CN115247420A CN115247420A CN202211072511.5A CN202211072511A CN115247420A CN 115247420 A CN115247420 A CN 115247420A CN 202211072511 A CN202211072511 A CN 202211072511A CN 115247420 A CN115247420 A CN 115247420A
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- pile
- micp
- construction method
- cementing
- slurry
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- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 239000004576 sand Substances 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 108010046334 Urease Proteins 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 6
- 239000011362 coarse particle Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052791 calcium Inorganic materials 0.000 abstract description 4
- 239000011575 calcium Substances 0.000 abstract description 4
- 239000010419 fine particle Substances 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 230000001580 bacterial effect Effects 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 241000606860 Pasteurella Species 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P3/00—Preparation of elements or inorganic compounds except carbon dioxide
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/07—Bacillus
Abstract
The invention provides a calcium sand MICP pile based on prefabricated biological pulp and a construction method thereof. The invention can crush the large particles and reinforce the fine particles in advance during the construction process, thereby obtaining higher reinforcing strength; the calcium sand MICP pile based on the prefabricated biological pulp has a core reinforcing area and a diffusion reinforcing area, and the injected prefabricated biological pulp and cementing liquid can diffuse for a certain distance in a stratum with underground water or cracks, so that a soil body near a pile body can be reinforced to a certain degree.
Description
Background
The cement mixing pile is widely applied to soft soil foundation treatment due to the advantages of wide application range, large reinforcement depth, short construction period, low cost and the like. However, in the marine ecological environment, especially in the calcareous sand area, the use of cement materials in a large area will cause serious environmental pollution, which affects the marine ecology, and at the same time, the consumption of energy and resources in the cement production process is large, which does not meet the requirement of sustainable development. Therefore, it is necessary to develop a new environmental protection foundation treatment technology suitable for marine environment, in which the MICP piles show a better prospect.
At present, the common MICP grouting reinforcement method is to alternately inject the bacterial liquid and the cementing liquid into the soil body. However, the method has the disadvantages of complicated process, low utilization rate of the bacterial liquid and the cementing liquid and long construction period.
Disclosure of Invention
In order to overcome the defects, the invention provides a calcium sand MICP pile based on prefabricated biological pulp and a construction method thereof.
A construction method of a calcareous sand MICP pile based on prefabricated biological pulp particles specifically comprises the following steps: 1) Positioning a drilling machine: the jacket and the stirring shaft are vertical to the ground, the angle deviation does not exceed 1.5 percent, and the pile position deviation is not more than 50mm.
2) Drilling and crushing coarse particles: the drill bit breaks the large particles while drilling, and the fine particles are directly reinforced to obtain higher pile strength. Stopping when the drill-down reaches the designed depth.
3) Grouting, stirring and lifting: and (3) spraying prefabricated biological slurry at the position of a drill bit, stirring at the bottom of the pile for at least 30 seconds, then lifting the drill rod, and continuously grouting and stirring in the lifting process of the drill rod.
4) And (3) cementing liquid is infiltrated into the surface: the prepared cementing liquid (0.5-1 mol/L) is injected into the top surface of the pile body and freely infiltrates under the action of gravity, so that the soil body in the pile body is in an unsaturated state, and the cementing is more effective.
5) And (5) freely cementing for 2-4 days, and finishing piling.
In the above technical solution, further, the preparation method of the prefabricated bio-slurry comprises: adding a certain amount of the cementing liquid into the urease bacterial solution in advance, stirring at the speed of 400-600rpm for 8-12h to fully separate out crystals, then placing the crystals into a refrigerator at 4 ℃ for standing for 6-24h, and pouring out the supernatant after the solids are completely settled to obtain the prefabricated biological slurry.
The invention also provides a calcareous sand MICP pile based on the prefabricated biological pulp, which is prepared by the construction method.
The method has the advantages that:
1. the large particles are broken in advance, and the fine particles are reinforced, so that higher reinforcing strength can be obtained.
2. The soil body can be cemented more efficiently by using prefabricated biological pulp particles and an unsaturated infiltration method.
3. The pile body is provided with a core reinforcing area and a diffusion reinforcing area, and the injected prefabricated biological slurry and cementing liquid can be diffused for a certain distance in a stratum with underground water or cracks, so that the soil body near the pile body can be reinforced to a certain degree.
Drawings
Figure 1.Micp mechanization;
FIG. 2 illustrates unconfined compressive strength of the pre-fabricated bio-slurry particle reinforced sandy soil sample and a sandy soil sample reinforced by a conventional method;
FIG. 3 is a diagram of a prefabricated bio-slurry particle reinforced sandy soil object of the present invention;
FIG. 4 is a construction flow chart.
Detailed Description
Fig. 4 is a construction flow chart of a calcium sand MICP pile based on prefabricated biological slurry.
The construction process of the calcareous sand MICP pile based on the prefabricated biological pulp specifically comprises the following steps:
1) Positioning a drilling machine: the jacket and the stirring shaft are vertical to the ground, the deviation is not more than 1.5 percent, and the pile position deviation is not more than 50mm;
2) Drilling and crushing coarse particles: the drill bit breaks large particles while drilling, and stops when drilling to a designed depth;
3) Grouting, stirring and lifting: spraying prefabricated biological slurry at the position of a drill bit, stirring for at least 30 seconds at the bottom of a pile, lifting a drill rod, and continuously grouting and stirring in the lifting process of the drill rod;
4) And (3) cementing liquid is infiltrated into the surface: injecting a pre-prepared cementing solution with the concentration of 0.5-1mol/L into the top surface of the pile body, and freely infiltrating under the action of gravity to enable the soil body in the pile body to be in an unsaturated state;
5) And (5) freely cementing for 2-4 days, and finishing pile forming.
The preparation method of the prefabricated biological pulp comprises the following steps: the preparation method of the prefabricated biological pulp comprises the following steps: adding 1 volume of cementing solution with the concentration of 2mol/L into 4 volumes of urease bacteria solution in advance, stirring at the speed of 400-600rpm for 8-12h to fully separate out crystals, then placing the crystals into a refrigerator at 4 ℃ for standing for 6-24h, and pouring out supernatant after the solids are completely settled to obtain the prefabricated biological slurry. The urease bacteria solution is urease pasteurella bacteria liquid, and the bacteria concentration is OD 600 =0.6-0.8, urease activity is 4-6mmol/L/min.
The mechanism for preparing and reinforcing the MICP pile is as follows: mixing and dissolving equal amount of calcium chloride and urea to form a cementing liquid, mixing the cementing liquid and a urease bacteria solution, hydrolyzing urea in the cementing liquid by using urease generated by urease bacteria to generate carbonate, combining the carbonate with calcium ions to generate calcium carbonate crystals, and using the calcium carbonate crystals generated in a foundation soil matrix as a cementing material of soil particles to reinforce the foundation (as shown in figure 1).
The strength of the soil body reinforced by the method is far higher than that of the traditional method (figure 2). The reinforcing efficiency of the invention is much higher than that of the traditional method, the calcium carbonate crystals generated by the method of the invention can be tightly attached to the surface of the soil particles, and different crystals are interwoven together, thus the cementing strength can be effectively improved (figure 3).
Claims (4)
1. A construction method of a calcareous sand MICP pile based on prefabricated biological slurry is characterized by comprising the following steps:
1) Positioning a drilling machine: the jacket and the stirring shaft are vertical to the ground, the angle deviation is not more than 1.5 percent, and the pile position deviation is not more than 50mm;
2) Drilling and crushing coarse particles: the drill bit breaks large particles while drilling down, and stops when drilling down to the designed depth;
3) Grouting, stirring and lifting: spraying prefabricated biological slurry at the position of a drill bit, stirring at the bottom of the pile for at least 30 seconds, then lifting a drill rod, and continuously grouting and stirring in the lifting process of the drill rod;
4) And (3) cementing liquid is infiltrated into the surface: pouring the prepared cementing liquid into the top surface of the pile body, and freely infiltrating under the action of gravity to enable the soil body in the pile body to be in an unsaturated state;
5) And (4) freely cementing, and finishing pile forming.
2. The construction method of the precast bio-slurry-based calcareous sand MICP pile according to claim 1, wherein in the step 3), the precast bio-slurry is prepared by the following steps: adding 1 volume concentration of 2mol/L cementing solution into 4 volumes of urease bacteria solution in advance, stirring at the speed of 400-600rpm for 8-12h to fully separate out crystals, then placing the crystals into a refrigerator at 4 ℃ for standing for 6-24h, and pouring out supernatant liquid after the solids are completely settled to obtain the prefabricated biological slurry.
3. The construction method of the pre-fabricated bio-slurry-based calcareous sand MICP pile according to claim 1, wherein in the step 4), the concentration of the pre-prepared cementing fluid is 0.5-1mol/L.
4. A calcareous sand MICP pile based on prefabricated biological pulp, characterized in that it is prepared by the construction method according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211072511.5A CN115247420A (en) | 2022-09-02 | 2022-09-02 | Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211072511.5A CN115247420A (en) | 2022-09-02 | 2022-09-02 | Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115247420A true CN115247420A (en) | 2022-10-28 |
Family
ID=83700341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211072511.5A Pending CN115247420A (en) | 2022-09-02 | 2022-09-02 | Calcareous sand MICP pile based on prefabricated biological pulp and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115247420A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270369A (en) * | 2008-05-06 | 2008-09-24 | 清华大学 | Microorganism cause concrete or concrete, producing method and application thereof |
| CN104929114A (en) * | 2015-06-24 | 2015-09-23 | 江苏省建筑科学研究院有限公司 | High pressure jet grouting pile waterproof curtain construction device and method |
| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| CN109371975A (en) * | 2018-10-25 | 2019-02-22 | 广西建工集团基础建设有限公司 | A kind of CFG stake implantation construction method suitable for compound soft or hard geology |
| KR20190143205A (en) * | 2018-06-20 | 2019-12-30 | 이엑스티 주식회사 | Construction method of composite pile with extensioned tip |
| CN112211176A (en) * | 2019-07-10 | 2021-01-12 | 广东工业大学 | Microorganism grouting and drainage curing pile and construction method and application thereof |
-
2022
- 2022-09-02 CN CN202211072511.5A patent/CN115247420A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270369A (en) * | 2008-05-06 | 2008-09-24 | 清华大学 | Microorganism cause concrete or concrete, producing method and application thereof |
| CN104929114A (en) * | 2015-06-24 | 2015-09-23 | 江苏省建筑科学研究院有限公司 | High pressure jet grouting pile waterproof curtain construction device and method |
| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| KR20190143205A (en) * | 2018-06-20 | 2019-12-30 | 이엑스티 주식회사 | Construction method of composite pile with extensioned tip |
| CN109371975A (en) * | 2018-10-25 | 2019-02-22 | 广西建工集团基础建设有限公司 | A kind of CFG stake implantation construction method suitable for compound soft or hard geology |
| CN112211176A (en) * | 2019-07-10 | 2021-01-12 | 广东工业大学 | Microorganism grouting and drainage curing pile and construction method and application thereof |
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