CN108589798B - A kind of large diameter pile foundation wash preventing method and device based on MICP technology - Google Patents
A kind of large diameter pile foundation wash preventing method and device based on MICP technology Download PDFInfo
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- CN108589798B CN108589798B CN201810283744.7A CN201810283744A CN108589798B CN 108589798 B CN108589798 B CN 108589798B CN 201810283744 A CN201810283744 A CN 201810283744A CN 108589798 B CN108589798 B CN 108589798B
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- slip casting
- pile foundation
- grouting
- large diameter
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
Abstract
The invention discloses a kind of large diameter pile foundation wash preventing methods and device based on MICP technology, this method is main are as follows: waits for that grouting device is arranged in stabilization zone side in pile foundation protection against erosion, sizing device is taken out in other side setting, slip casing by pressure is carried out by grouting device, taking out sizing device carries out pumping slurry simultaneously, slip casting is based on MICP technology: first injecting pH7-8 bars of formula bacillus bacterium solution, reinject calcium chloride solution, finally injection urea and calcium chloride mixed solution, after the completion, by grouting device and sizing device location swap is taken out, above-mentioned slip casting is carried out again and takes out slurry process；This method can form crust layer on sea bed surface, greatly enhance the protection against erosion ability of sea bed.Grouting device of the invention mainly includes slip casting leg, hollow steel rotary table, standardization concrete ballast plate, fixed steel cylinder, Grouting Pipe etc., has many advantages, such as small to soil disturbance, easy for construction, reusable, general applicability is good.It has a extensive future.
Description
Technical field
The present invention relates to large diameter pile foundation wash preventing method and device more particularly to a kind of major diameters based on MICP technology
Pile foundation wash preventing method and device belong to biotechnology fixed buildings field.
Background technique
The construction development just like a raging fire of bridge spanning the sea, offshore wind farm, ocean platform, however, large diameter pile foundation is close
Extra large works is influenced during military service by wave, action of ocean current, and it is serious that Sandy Seabed pile foundation washes away problem, is directly affected
To pile foundation and the stability of superstructure, huge challenge is brought to the safe operation of offshore structure object.In the following, briefly illustrating current
The deficiency of protection against erosion measure: sacrificing stake method and be unsuitable for the protection under water (flow) direction situation of change before stake, so can not be applied to close
In the scour protection of extra large pile foundation；Guard ring, protective case method sea bed face not usually, position is easy to change, and scouring effect is difficult to maintain,
And later maintenance difficulty is big；Jackstone method globality is poor, and constructing, relatively complicated, project amount is big, later maintenance cost is high；Expand
Foundation protection method bottom around Extended chemotherapy scour hole easy to form, constantly generation sapping, may cause rushing for Extended chemotherapy
Brush destroys；The underwater slip casting of grouting method can bring biggish pollution to environment, deteriorate the living environment of marine organisms.
In recent years, microorganism soil stabilization technology rapidly develops, and this method is with easy for construction, grouting pressure is low (slightly larger
In water pressure), consolidation effect it is good, it is free from environmental pollution, on the soil body in situ influence it is small many advantages, such as.But related microorganisms are anti-
The technology of washing away there is no related application, especially in marine environment.The cardinal principle of the method is the mineralization using microorganism
The cementing soil particle in shot state has the intensity of the shot soil body, rigidity and is significantly promoted.At present, cementing effect
The best Microbial Metallogenesis of fruit is to generate calcite type calcium carbonate deposition, and this mineralization is known as microorganism induction side's solution
Stone deposits (Microbiologically induced calcite precipitation, abbreviation MICP).Related scholar couple
MICP technology has carried out a large amount of in-house laboratory investigation, shows that the cementing high-efficient, soil strength of the method is substantially improved, can will be loose
Loose sand grain is cemented to 5m sand column.Currently, maturation is hydrolysis of urea MICP technology the most, and main process is PH7-8 bars of formula gemma
Bacillus hydrolyzes urea and generates carbanion and ammonium ion, later the calcium binding shape in carbanion and slip casting solution
At the calcium carbonate crystal with cementation.
The present invention by MICP technical application to offshore structure object pile foundation scour protection in, will be in a certain range of Sandy Seabed
Soil body progress curing process, and a kind of, construction convenient and fast note (pumping) sizing device small to soil disturbance in situ has been invented, it is anti-in guarantee
Scouring effect, it is environmental-friendly under the premise of, reduce cost, accelerate construction progress.
Summary of the invention
The present invention washes away problem for large diameter pile foundation in Sandy Seabed, existing pile foundation protection against erosion technology there are it is many not
In the case where foot, a kind of large diameter pile foundation wash preventing method and device based on MICP technology is proposed, this method is using micro-
It is whole to reinforce the surface layer soil body to form crust layer within the scope of the certain depth of sea bed surface for the cementing soil particle of biomineralization
Property, improve strength and stiffness, and then protective pile foundation washes away, and guarantees offshore structure safe handling.The present invention is used novel note
(pumping) sizing device hangs, the mode of the injection soil body, greatly accelerates construction speed and reduces the disturbance to the soil body, in addition, should
Technology also have it is cementing it is high-efficient, that consolidation effect is good, free from environmental pollution, at low cost, grouting pressure is low, later maintenance is few etc. is many
Advantage can significantly improve the protection against erosion ability of pile peripheral earth in Sandy Seabed.
The present invention takes following technical scheme:
A kind of large diameter pile foundation wash preventing method based on MICP technology is to wait for that stabilization zone side is arranged in pile foundation protection against erosion
Sizing device is taken out in grouting device, other side setting, carries out slip casing by pressure by grouting device, while taking out sizing device and carrying out pumping slurry, infuses
Slurry is based on MICP technology: first injecting pH7-8 bars of formula bacillus bacterium solution, reinjects calcium chloride solution, finally injects urea and chlorine
Change calcium mixed solution, after the completion, by grouting device and takes out sizing device location swap, carry out above-mentioned slip casting again and take out slurry process, it can
It is repeated multiple times.
A kind of large diameter pile foundation protection against erosion grouting device based on MICP technology including hollow steel rotary table, is respectively fixed
In the Grouting Pipe of steel rotary table upper surface and several slip casting legs of lower surface, Grouting Pipe, steel rotary table, slip casting leg are communicated, the note
Slurry leg is elongated steel pipe, several injected holes is uniformly provided on pipe shaft, being also welded with several surfaces in steel rotary table upper surface has
The fixation steel cylinder of screw thread standardizes correspondence on concrete ballast plate and is provided with several connecting holes, and fixed steel cylinder is inserted into connecting hole simultaneously
It is fixed by nut by concrete ballast plate is standardized, the hole for hoist for construction is provided on fixed steel cylinder.Slip casting dress
Setting, which also can be used as, takes out sizing device use.
In above-mentioned technical proposal, it is preferred that the tube bottom of the slip casting leg is in cone shape, is easy to the injection soil body.
Preferably, each injected hole inner wall and outside wall surface are each provided with layer of steel wire net on the slip casting leg, especially
It is high-strength detailed catalogue steel wire, to prevent silt during slip casting leg injection sea bed from blocking injected hole.
Preferably, the grouting device further includes soil body resistivity measurement device, according to grouting device position with
And stabilization zone shape, by soil body resistivity measurement sensor arrangement on corresponding slip casting leg, dynamic monitoring grouting in soil mass effect.
Preferably, one row's injected hole is set at interval of 5cm along axial direction on the slip casting leg, every row's injected hole is along slip casting
8 injected holes of leg radial equipartition.
Preferably, the injected hole aperture is 1cm.
MICP slip casting protection against erosion technology of the invention is main including the following three aspects: first, this technology utilize relative at
Ripe hydrolysis of urea MICP reaction, bacterium are PH7-8 bars of formula bacillus, and cementing solution is urea liquid, calcium chloride mixing is molten
Liquid.Second, the processes such as grouting process adheres to bacterium, nutrient solution supplies influence greatly, thus can be to glue final between soil particle
Knot effect has an immense impact on, and using substep slip casting method, a certain amount of PH7-8 bars of formula bacillus bacterium solution is first injected into sand,
It is slowly injected into the calcium chloride solution of low concentration later, microorganism is fixed on soil particle table using the flocculation of calcium ion
Face, finally low speed injection urea and calcium chloride mixed solution, progress are cementing again.Third, the present invention are taken out using side slip casting side
The technique of slurry infuses the position of (pumping) sizing device by reasonable Arrangement, and (0.5m depth is left for the surface layer soil body in the range that needs reinforcement
It is right) in form steady seepage field, by slip casting, take out slurry alternately reach better consolidation effect.
Using main advantages of the present invention: 1, relative to conventionally employed chemistry of cement slurries, the present invention is based on MICP skills
Art ecology is friendly, underwater slip casting is free from environmental pollution；2, it is suitble to alkaline marine environment (PH7-8 bars of formula bacillus activity is good)；3,
Pre-existing topography is not changed, superficial layer is reinforced, not will form the marginal scouring effect of the protection bodies such as jackstone；4, cementing discrete particles,
Greatly strengthen the scour resistance of seabed soil；5, novel note (pumping) sizing device is by self weight injection seabed soil, to original position
Soil disturbance is small, and speed of application is fast.6, this technology is equipped with soil body resistivity test system, can monitor slip casting process in time,
The quality of slip casting process can be controlled well.
Detailed description of the invention
Fig. 1 is single pile protection against erosion stabilization zone note (pumping) sizing device arrangement and flow field schematic diagram；
Fig. 2 is flow field vertical cross section schematic diagram in slip casting pile week sea bed；
Fig. 3 is that note (pumping) sizing device schematic diagram is hung in work progress；
Fig. 4 is novel note (pumping) sizing device three-dimensional structure front schematic diagram；
Fig. 5 is novel note (pumping) sizing device three-dimensional structure bottom schematic diagram；
Fig. 6 is concrete ballast plate three-dimensional structure schematic diagram in novel note (pumping) sizing device；
Fig. 7 is steel rotary table three-dimensional structure diagrammatic sectional view (I) in novel note (pumping) sizing device；
Fig. 8 is steel rotary table three-dimensional structure diagrammatic sectional view (II) in novel note (pumping) sizing device；
Fig. 9 is novel note (pumping) sizing device main view；
Figure 10 is slip casting leg structural schematic diagram；
Figure 11 is A-A sectional view in slip casting leg structure；
Wherein, 1 note (pumping) sizing device, 2 slip casting legs, 3 steel rotary tables, 4 standardization concrete ballast plates, 5 fixed steel cylinders, 6 notes
Slurry pipe, 7 notes (pumpings) slurry hose, 8 injected holes, 9 soil body resistivity measurement sensors, 10 fixation steel cylinders on hole for hoist.
Specific embodiment
A kind of large diameter pile foundation protection against erosion note (pumping) sizing device based on MICP technology, mainly includes slip casting leg 2, steel rotary table
3, it standardizes concrete ballast plate 4, fixed steel cylinder 5, Grouting Pipe 6, hang chain and soil body resistivity measurement sensor 9 etc., match
The construction equipment of conjunction mainly has small-sized workboat (equipped with small-sized lifting machine), slip casing by pressure machine (small-sized), suction pump etc..The slip casting
Device is equipped with 8 slip casting legs 2, and 2 main body of slip casting leg is elongated steel pipe, and for pipe outside diameter having a size of 8cm, bottom of the tube is that cone is easy to pass through
Enter the soil body, radially row's injected hole is arranged in 8 injected holes 8 of equidistantly distributed, axially spaced 5cm to pipe shaft, and aperture is preferably
1cm is respectively provided with one at the inner and outer wall of injected hole to prevent silt during slip casting leg injection sea bed from blocking injected hole
The high-strength detailed catalogue steel wire of layer, steel wire and pipe shaft weld.It is equipped with screw thread at the top of slip casting leg, carries out spiral shell with 3 corresponding hole site of steel rotary table
Line connection.3 main body of steel rotary table is the hollow cylinder of radius (R) 2m, thickness (d) 10cm, by steel plate cutting, is welded, wherein
Steel plate used with a thickness of 2cm, to prevent hollow round table compressive buckling, need to steel plate carry out ribbing processing, on bottom plate away from
On the concentric circles for being 0.9R from the center of circle, 8 holes are uniformly distributed for interval with 45 °, aperture is equal to slip casting leg outer diameter 8cm；In top plate
On be 0.5R apart from the center of circle concentric circles on, with 90 ° to be equipped at intervals with 4 positions, fixed steel cylinder 5, cylinder diameter is respectively welded
For 5cm, wall thickness 1cm, it is equipped with screw thread, concrete ballast plate 4 and connection for fixing top hang chain.Standardize coagulation soil pressure
Support plate 4 be diameter be 2m, the precast slab that is about 1.0t with a thickness of 15cm, weight, constructional reinforcement is carried out in plate, in distance
The center of circle is on 0.5R concentric circles, is four fixations for being equipped at intervals with 4 diameters for the connecting hole of 5cm, on hollow steel rotary table with 90 °
Steel cylinder is inserted into four connecting holes of carrier plate, then is fixed by nut；When carrier plate is preferable for seabed conditions, be in the milk leg
In the case where being difficult to injection to designated depth.The upper position of fixed steel cylinder is equipped with hole for hoist, can pass through high-strength anchor chain or steel
Twisted wire is connected with suspension hook, is convenient for construction hoisting.According to grouting device position and stabilization zone shape, soil body resistivity is surveyed
Examination sensor 9 is arranged on corresponding slip casting leg.Grouting device has both simultaneously takes out slurry function, due to the slurry viscosity and water phase of perfusion
Closely, therefore it is low to grouting pressure requirement, it is slightly larger than water pressure.Specific construction process:
1. determining the size and slip casting, pumping sizing device arrangement of pile foundation protection against erosion square stabilization zone according to stake diameter size；
4 quantity of concrete ballast plate of each note (pumping) sizing device 1 is determined according to the compactness of pile peripheral earth and group is filled with (pumping) slurry dress
1 is set, arranges soil body resistivity measurement sensor 9 as needed.
2. assembled note (pumping) sizing device 1 successively to be hung onto the corresponding position of sea bed, note using small-sized lifting ship
Slip casting hose 7, the slip casing by pressure machine on the other end and workboat of slip casting hose 7 are connected in the Grouting Pipe 6 of (pumping) sizing device 1
It is connected.Under Gravitative Loads, the slip casting leg gradually injection sea bed of (pumping) sizing device 1 is infused.
3. shown in Fig. 1, carrying out slip casing by pressure in note (pumping) sizing device 1 of one row of left side, opens be connected at the same time
One row of right side takes out the water pump on (note) sizing device 1, in grouting device and takes out and will form Fig. 1, stabilization shown in 2 between sizing device
Seepage field.Under seepage flow field action, bacterium solution and cementing solution can relatively evenly pass through the stabilization zone soil body.
4. grouting with plunger: being initially injected PH7-8 bars of formula bacillus bacterium solution, bacterium solution enters note (pumping) slurry from Grouting Pipe 6
It inside the hollow round table of device, is entered in each slip casting leg later, penetrates into seabed soil from slip casting leg side wall grouting hole 8
In, under seepage flow field action shown in Fig. 2, residual solution and seawater by soil body exudation, which enter, to be taken out in sizing device 1, is passed through
It takes out slurry hose 7 and returns to the corresponding collection on workboat, in processing unit.Later with the chlorination of lower speed injection low concentration
Microorganism is fixed on soil particle surface using the flocculation of calcium ion by calcium solution.Finally low speed injection urea and chlorination again
Calcium mixed solution (cementing solution).In this way, just completing once grouting operation.After the completion of once grouting operation, grouting device and pumping
Sizing device exchanges role, and grouting device originally becomes to take out sizing device, and pumping sizing device originally becomes grouting device, makes seepage field
Reversely, then above step is carried out.According to the test result of soil body resistivity measurement equipment 9, may be selected to carry out multiple slip casting operation.
5. after completing slip casting task, the recycling of (pumping) sizing device 1 will be infused using lifting ship and cleaned.
Claims (6)
1. a kind of large diameter pile foundation protection against erosion grouting device based on MICP technology, which is characterized in that including hollow steel rotary table
(3), the Grouting Pipe (6) of steel rotary table (3) upper surface and several slip casting legs (2) of lower surface, Grouting Pipe (6), steel are individually fixed in
Rotary table (3), slip casting leg (2) communicate, and the slip casting leg (2) is elongated steel pipe, and several injected holes are uniformly provided on pipe shaft
(8), several surfaces are also welded in steel rotary table (3) upper surface and have threaded fixed steel cylinder (5), standardize concrete ballast plate
(4) corresponding on to be provided with several connecting holes, fixed steel cylinder (5) are inserted into connecting hole and will standardize concrete ballast plate by nut
(4) fixed, the hole for hoist for construction is provided on fixed steel cylinder (5).
2. the large diameter pile foundation protection against erosion grouting device according to claim 1 based on MICP technology, which is characterized in that institute
The tube bottom for the slip casting leg (2) stated is in cone shape.
3. the large diameter pile foundation protection against erosion grouting device according to claim 1 based on MICP technology, which is characterized in that institute
Each injected hole inner wall and outside wall surface are each provided with layer of steel wire net on the slip casting leg (2) stated.
4. the large diameter pile foundation protection against erosion grouting device according to claim 1 based on MICP technology, which is characterized in that institute
The grouting device stated further includes soil body resistivity measurement device (9), is arranged on slip casting leg (2).
5. the large diameter pile foundation protection against erosion grouting device according to claim 1 based on MICP technology, which is characterized in that institute
One row's injected hole (8) is set at interval of 5cm along axial direction on the slip casting leg (2) stated, every row's injected hole (8) is radially equal along slip casting leg
8 injected holes of cloth.
6. the large diameter pile foundation protection against erosion grouting device according to claim 1 based on MICP technology, which is characterized in that institute
Injected hole (8) aperture stated is 1cm.
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| CN109629570A (en) * | 2019-01-15 | 2019-04-16 | 三峡大学 | A kind of device and method of microorganism substep consolidation by grouting sand |
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| CN110158598A (en) * | 2019-05-31 | 2019-08-23 | 浙江同济科技职业学院 | A kind of large diameter pile foundation wash preventing method and device that main passive protection combines |
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| CN114045834B (en) * | 2021-12-03 | 2023-06-20 | 中国人民解放军陆军工程大学 | Sand soil rapid solidification slip casting pile forming device |
| CN114753414B (en) * | 2022-04-13 | 2023-07-14 | 中交三航局第三工程有限公司 | Intelligent anti-scouring device and method for annular grid type fluidized soil steel pipe pile |
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