CN108060678B - A kind of coral Flooding in Borehole bucket base bracing means and installation method based on MICP - Google Patents
A kind of coral Flooding in Borehole bucket base bracing means and installation method based on MICP Download PDFInfo
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- CN108060678B CN108060678B CN201711277952.8A CN201711277952A CN108060678B CN 108060678 B CN108060678 B CN 108060678B CN 201711277952 A CN201711277952 A CN 201711277952A CN 108060678 B CN108060678 B CN 108060678B
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- bucket base
- slip casting
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- micp
- flooding
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/22—Caisson foundations made by starting from fixed or floating artificial islands by using protective bulkheads
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- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of coral Flooding in Borehole bucket base bracing means and installation method based on MICP, the device includes bucket base, suction eye, slip casting general pipeline, slip casting steel pipe, check valve, return pipe etc., the drainage hole being connected with slip casting steel pipe is provided on the bucket base top plate, slip casting steel pipe arranges that injected hole is arranged along basic lateral wall in slip casting steel pipe at equal intervals in " rice " font；Return pipe is arranged in fundamental external, the recycling and circulation for slurries.The present invention reinforces coral Flooding in Borehole using microorganism diagenesis, more can effectively increase between gravel and the cementation of gravel and works, increases the bearing capacity and stability on basis；MICP technology, almost without adverse effect, is a kind of environmental protection technology suitable for coral sand stratum consolidation to environment and ecology.
Description
Technical field
The present invention relates to a kind of biological grouting device more particularly to a kind of coral Flooding in Borehole barrel shape bases based on MICP technology
Plinth bracing means and installation method.
Background technique
In recent years, country energetically push Reef in Chinese South Sea construction, more and more marine structures in planning and construction,
However since Reef in Chinese South Sea is mainly the coral reef formed due to biogenesis, lower part is more hard biohermal limestone, and
Top is relatively shallower coating, the stronger coral sand of activity and coral dust, is very likely occurred under wind wave flow action
Mobile and migration, has an adverse effect to the basis in the stratum.
For ground and strengthening of foundation, mainly there are cement injection consolidation techniques at present.But since cement is to marine environment
There is pollution, will affect the existence of the existence of marine organisms, especially reef-building coral, destroys original ecosystem, therefore cannot
Coral sand and coral dust are reinforced in such a way that cement injection is cementing.
Microbial mineralization is the more universal phenomenon of nature, and microbe research person utilized some specific micro- in recent years
The calcite carbon with excellent cementing power is quickly precipitated by being provided calcium ion abundant and nitrogen source nutrient solution in biology
Sour calcium crystallization, this biomineralization are commonly referred to as microorganism induction calcite type calcium carbonate deposition technique, i.e. MICP
(Microbial induced calcite deposition) technology.It is raw using the cementing loose coral layer of sand of MICP technology
At calcium carbonate it is identical as coral sand main chemical compositions, microstructure is preferable with cohesiveness, reaction pollution it is small, stratum is disturbed
It moves small.MICP technical cure coral sand has high application prospect in islands and reefs engineering.Therefore, the invention proposes by MICP skill
Art is applied to the bracing means and technology of bucket base in coral Flooding in Borehole.
Summary of the invention
The present invention is directed to the existing serious environmental problems of existing slurry injection technique, proposes a kind of coral sand based on MICP
Stratum bucket base bracing means and technology, the technology overcome the pollution problem of the technology of original slip casting, and can be quickly corals
Coral mastic forms rock, can effectively improve stratum bearing capacity.
The present invention takes following technical scheme:
A kind of coral Flooding in Borehole bucket base bracing means based on MICP, including bucket base, inside are equipped with cross
Partition will be divided into four compartments in bucket base, cross partition can be with the integral strength and rigidity of reinforcement structure, in barrel shape base
Each compartment is corresponded on the top plate of plinth and is respectively provided with several suction eyes, and all suction eyes are distributed in using bucket base center as the center of circle
Circle on, which further includes extending to bucket from workboat with the equal number of slip casting steel pipes of suction eye and return pipe, slip casting general pipeline
The center at type basis top, one end of all slip casting steel pipes connect altogether and are connected by connector with slip casting general pipeline, slip casting steel
Pipe is uniformly distributed at the top of bucket base, and one suction eye of each slip casting steel pipe connection then passes through a check valve and extends to bucket
Outer wall and extend downward into basic bottommost along outer wall, be uniformly arranged several outside sides in the vertical section of slip casting steel pipe
Wall injected hole；Return pipe is vertical pipe, is uniformly arranged on the periphery of bucket base, is corresponded with slip casting steel pipe, return pipe
Length is 1.5 times of bucket base buried depth, and return pipe is opened several return pipe injected holes close to a basic lateral edge uniform depth, returned
Flow tube upper end is connected to the sink on workboat by return-flow catheter.
In above-mentioned technical proposal, the draw ratio of the bucket base is 1:2.
Distance of the return pipe away from bucket base center is 1.5 times of bucket base diameter.
The bucket base radius that distance of the suction eye away from bucket base center is 1/2.The suction eye is set altogether
It is equipped with eight.
The substep grouting method of the propositions such as proposed adoption Harkes and Van Paassen of the present invention, this method are as follows: first to layer of sand
In pour into a certain amount of bacterium solution, then low speed pours into the CaCl of low concentration2Solution realizes micro- life using the flocculation of calcium ion
The fixation of object, finally into stratum, low speed pours into cementing solution (urea-CaCl2), so that the microorganism being adsorbed in gravel is not
Medium well is at calcium carbonate gel.
Its installation operation flow of the device of the invention are as follows: in bucket base installation, by slip casting general pipeline to extracardiac pumping, by
It is now in closed state in the check valve on slip casting steel pipe, the suction function applied makes its downward injection in bucket base；
After completing installation, inverse injection solution, check valve is opened, so that slurries pass through injection sand by suction eye and side wall grouting hole
Layer aspirates return pipe by water pump at the same time and most of unreacted solution is made to be back to sink, measures each ion concentration, root
According to addition solvent is required, slip casting solution is recycled.
The main function of external reflux pipe is that internal Grouting Pipe can be cooperated to form relatively stable seepage field, accelerates slip casting
The circulation of solution can also recycle unreacted solution to accelerate biological diagenesis, and appearance liquid is recycled,
It economizes on resources, improves the service efficiency of solution.
The invention has the following advantages that
Reinforce coral Flooding in Borehole based on MICP, more can effectively increase between gravel and gravel and works it is cementing
Effect increases the bearing capacity and stability on basis；The reinforcement technique utilizes biological diagenesis principle energy rapid reinforcement coral Flooding in Borehole,
It is a kind of environmental protection technology suitable for coral sand stratum consolidation to environment and ecology almost without adverse effect.
Detailed description of the invention
Fig. 1 is the total schematic diagram of the present invention；
Fig. 2 is grouting device top view；
Fig. 3 is grouting device vertical cross-sectional；
Streamline schematic diagram when Fig. 4 is slip casting；
Wherein, 1 bucket base, 2 cross partitions, 3 suction eyes (top injected hole), 4 slip casting general pipeline, 5 slip casting steel pipes, 6
Slip casting pipe connector, 7 check valves, 8 side wall grouting holes, 9 return pipes, 10 return pipe injected holes, 11 sinks.
Specific embodiment
Referring to Fig.1-4, the bucket base 1 is suction bucket base, and draw ratio 1:2, there is cross partition 2 in inside
With the integral strength and rigidity of reinforcement structure, bucket base is divided into four compartments by partition 2, and the top plate of each compartment is in radius
There are two suction eye 3 (while being also top injected hole), two drainage holes 3 and angles folded by roof center line at half
It is 45 degree.Slip casting general pipeline 4 is connected to the center at the top of basis from workboat, 6 phase of connector with eight slip casting steel pipes 5
Even, eight slip casting steel pipes 5 are arranged in " rice " font, and each slip casting steel pipe 5 connects a suction eye 3 (top injected hole) and then leads to
Check valve 7 is crossed to be connected to the outer wall of bucket and extend downwardly along outer wall up to basic bottommost, in 5 vertical section of slip casting steel pipe along bar
It is uniformly arranged four outside side wall grouting holes 8, the outflow for injection slurry.1 outside of basis it is conllinear with slip casting steel pipe 5 away from
From return pipe 9 is arranged at the position that central point is 2 times of radiuses, the length of return pipe 9 is 1.5 times of basic 1 buried depth.Return pipe 9
Close to basis, one lateral edge uniform depth opens six return pipe injected holes 10, connects return-flow catheter on return pipe and is connected to ship upper flume
11。
The present invention is operating process are as follows: when bucket base 1 is installed, by slip casting general pipeline 4 to extracardiac pumping, due to slip casting steel
Check valve 7 on pipe 5 is now in closed state, and the suction function applied makes its downward injection in bucket base 1；It completes
After installation, inverse injection solution, check valve 7 is opened, so that slurries pass through injection layer of sand by suction eye 3 and side wall grouting hole 8,
Aspirating return pipe 9 by water pump at the same time makes most of unreacted solution be back to sink 11, measures each ion concentration, root
According to addition solvent is required, slip casting solution is recycled.
Claims (7)
1. a kind of coral Flooding in Borehole bucket base bracing means based on MICP, which is characterized in that interior including bucket base (1)
Portion, which is equipped with cross partition (2), will be divided into four compartments in bucket base, it is each that each compartment is corresponded on the top plate of bucket base
Be provided with several suction eyes (3), all suction eyes are distributed in using bucket base center as on the circle in the center of circle, the device further include with
The equal number of slip casting steel pipes (5) of suction eye (3) and return pipe (9), slip casting general pipeline (4) are extended at the top of bucket base from workboat
Center, one end of all slip casting steel pipes (5) connects altogether and is connected with slip casting general pipeline (4) by connector (6), slip casting steel pipe
(5) it is uniformly distributed at the top of bucket base, each slip casting steel pipe (5) connects a suction eye (3) and then passes through a check valve
(7) it extends to the outer wall of bucket and extends downward into basic bottommost along outer wall, be uniformly arranged in the vertical section of slip casting steel pipe (5)
Several outside side wall grouting holes (8)；Return pipe (9) is vertical pipe, the periphery of bucket base (1) is uniformly arranged on, with note
It starches steel pipe (5) to correspond, the length of return pipe (9) is 1.5 times of bucket base (1) buried depth, and return pipe (9) is close to basis one
Lateral edge uniform depth opens several return pipe injected holes (10), and return pipe upper end is connected to the water on workboat by return-flow catheter
Slot (11).
2. the coral Flooding in Borehole bucket base bracing means according to claim 1 based on MICP, which is characterized in that described
Bucket base (1) draw ratio be 1:2.
3. the coral Flooding in Borehole bucket base bracing means according to claim 1 based on MICP, which is characterized in that described
Distance of the return pipe (9) away from bucket base (1) center be 1.5 times of bucket base diameter.
4. the coral Flooding in Borehole bucket base bracing means according to claim 1 based on MICP, which is characterized in that described
Distance of the suction eye (3) away from bucket base (1) center be 1/2 bucket base radius.
5. the coral Flooding in Borehole bucket base bracing means according to claim 1 based on MICP, which is characterized in that described
Suction eye (3) be provided with eight altogether.
6. the installation side of the coral Flooding in Borehole bucket base bracing means as described in any one in claim 1-5 based on MICP
Method characterized by comprising
Slip casting general pipeline (4) is first passed through to extracardiac pumping, the check valve (7) on slip casting steel pipe (5) is now in closed state, institute of drawing water
The suction function of application is on bucket base (1), so that the downward injection of bucket base；It is anti-from slip casting general pipeline (4) after completing installation
To injection solution, check valve (7) is opened, so that slurries inject layer of sand by suction eye (3) and side wall grouting hole (8), it is same with this
When return-flow catheter is aspirated by water pump most of unreacted solution is made to be back to sink, each ion concentration is measured, according to requiring
Solvent is added, slip casting solution is recycled.
7. the installation method of the coral Flooding in Borehole bucket base bracing means based on MICP as claimed in claim 6, feature
It is, substep grouting method is used in slip casting, specifically: microbial inoculum is first poured into layer of sand, then pours into CaCl2It is molten
Liquid is realized the fixation of microorganism using the flocculation of calcium ion, urea-CaCl is finally poured into stratum2Cementing solution, makes
The microorganism that must be adsorbed in gravel is continuously generated calcium carbonate gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711277952.8A CN108060678B (en) | 2017-12-06 | 2017-12-06 | A kind of coral Flooding in Borehole bucket base bracing means and installation method based on MICP |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711277952.8A CN108060678B (en) | 2017-12-06 | 2017-12-06 | A kind of coral Flooding in Borehole bucket base bracing means and installation method based on MICP |
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| Publication Number | Publication Date |
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| CN108060678A CN108060678A (en) | 2018-05-22 |
| CN108060678B true CN108060678B (en) | 2019-06-14 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185024B (en) * | 2019-04-22 | 2020-05-22 | 浙江大学 | Device and method capable of simultaneously realizing MICP grouting and soil reinforcement and removing byproducts of MICP grouting and soil reinforcement |
| CN111379271A (en) * | 2020-03-17 | 2020-07-07 | 中国能源建设集团广东省电力设计研究院有限公司 | Offshore wind turbine foundation and grouting construction method thereof |
| CN113404078B (en) * | 2021-05-18 | 2022-07-15 | 中交第三航务工程局有限公司 | Method for blocking seepage channel of negative pressure barrel foundation |
| CN115262527B (en) * | 2022-06-07 | 2023-12-22 | 福建永强岩土股份有限公司 | Microorganism grouting device and method applied to marine foundation reinforcement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002143828A (en) * | 2000-11-09 | 2002-05-21 | Ichinomiya Kimitake | Countermeasure method for cleaning of soil and soil cleaning system |
| JP5252754B2 (en) * | 2012-02-03 | 2013-07-31 | 大成建設株式会社 | Ground improvement method using microorganisms |
| CN103773376B (en) * | 2014-02-13 | 2016-01-27 | 方祥位 | Method for solidifying loose coral sand by using microorganisms |
| CN105350517B (en) * | 2015-10-26 | 2017-06-23 | 南京林业大学 | A kind of method of cyclic microorganism grouting and reinforcing ground |
| CN106047366A (en) * | 2016-06-20 | 2016-10-26 | 方祥位 | Method for improving microorganism solidified coral sand by use of polypropylene fibers |
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