CN110438975A - A kind of microorganism grouting device and construction method for reinforcing deep soft clay - Google Patents
A kind of microorganism grouting device and construction method for reinforcing deep soft clay Download PDFInfo
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- CN110438975A CN110438975A CN201910666523.2A CN201910666523A CN110438975A CN 110438975 A CN110438975 A CN 110438975A CN 201910666523 A CN201910666523 A CN 201910666523A CN 110438975 A CN110438975 A CN 110438975A
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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
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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of microorganism grouting devices and construction method for reinforcing deep soft clay, including control system, feed liquor system, conductivity measuring device, solution recycle system and agitating device；The feed liquor system is for controlling microbial solution and reaction solution feed liquor rate；The solution recycle system is used to importing microbial solution and reaction solution into layer soil body to be solidified, and suction layer pore water to be solidified；The conductivity measuring device is used for the real time measure aspirated liquid conductivity, is promoted for controlling feed liquor rate and the agitating device；The agitating device is for stirring evenly layer soil body to be solidified and microbial solution/reaction solution, the present invention provides a kind of effective ways of deep soft clay of microorganism consolidation process, avoid conventional cement pollution caused by natural environment, reduce project cost, construction progress is controlled using automatic control system simultaneously, it ensures construction quality, also improves construction efficiency.
Description
Technical field
The present invention relates to a kind of microorganism grouting devices and construction method for reinforcing deep soft clay, belong to ground work
Journey technical field.
Background technique
In recent years, people increasingly pay attention to sustainable development and environmental-friendly demand for development, microorganism induction calcium carbonate
Deposition technique (hereinafter referred to as microorganism reinforcement technique) has become the research hotspot in Soft foundation treatment field.The technology is main
Using urease-producing microorganism decomposition urea, the calcium binding in the carbanion and reaction solution generated will be decomposed and generate carbonic acid
Calcium precipitate has the function that strengthen soil structures.This method because have it is resourceful, rapidly and efficiently and the features such as product nonhazardous
It is increasingly becoming the cutting edge technology of foundation stabilization.
Currently, mainly having injection method, infusion method using the construction method of the microbial method improvement soil body and pouring method.2010
Microorganism reinforcement technique is applied to Practical Project basement process for the first time by Holland, and technical staff is using pouring method to thick 17m, volume
About 100m3Sand carry out bioreinforcement processing, stabilization zone remains stable during entire pipeline construction, consolidation effect
Preferably.But existing microorganism reinforcement technique is only applicable in the coarse-grained soils such as the preferable sand of permeability and gravel soil, Wu Fa
Good consolidation effect is obtained in deep Soft Clay Foundation.Main cause is: soil body hole is smaller to cause microorganism to lack existence
Space and low-permeability lead to processing solution flowing slowly, and treatment effect is undesirable.
Two aspects are concentrated mainly on for the related invention of microorganism reinforcement technique before making the present invention.It on the one hand is to adopt
Sample used in laboratory is reinforced with mold, these reinforcement means can effectively reinforce small-sized soil body sample but simultaneously discomfort
For Practical Project；It on the other hand is the consolidation process that large area is carried out for foundation soil or slope soil, to this researcher
It proposes to utilize the sides such as the rail mounted pressing slip casting machine of the cured separation storage sprinkling system of microorganism and microorganism reinforcing engineering
Method carrys out the consolidated subsoil soil body.The above method is suitable for the preferable sand foundation of permeability, and is for earth's surface or shallower depth mostly
The soil body of degree, it is substantially zeroed for the invention of deep Soft Clay Foundation reinforcing device and method at present.
Therefore, it is necessary to research and develop a kind of suitable for the servo speed regulation microorganism grouting device of reinforcing deep soft clay and construction
Method, to meet requirement of engineering.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of microorganism slip casting dresses suitable for reinforcing deep soft clay
It sets and construction method, for solving the problems, such as that existing grouting method is not applied for deep layer and/or the soft stickiness soil body.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of microorganism grouting device for reinforcing deep soft clay, characterized in that including control system, feed liquor system
System, conductivity measuring device, solution recycle system and agitating device；
The feed liquor system is for controlling microbial solution and reaction solution feed liquor rate；
The solution recycle system is used to import microbial solution and reaction solution layer soil body to be solidified, and suction to
Cured layer pore water；
The conductivity measuring device passes through monitoring electricity for solution recycle system aspirated liquid conductivity described in the real time measure
The variation of conductivity value controls the agitating device and is promoted；
The agitating device is for stirring evenly layer soil body to be solidified and microbial solution/reaction solution；
The control system is for controlling each device, system and Information Collecting & Processing and feedback.
Further, the feed liquor system include at least two inlets of inlet pipe connection, it is corresponding it is each described in
The flow control switch of inlet and the liquid stirring device in the inlet pipe and pressure slurry feeding device, the liquid
Body agitating device is mixed for reaction solution.
Further, the solution recycle system includes delivery pipe, outlet tube, filter device, grouting spray head and vacuum
Pump；The delivery pipe input end is connect with the pressure slurry feeding device, and outlet end is connect with the grouting spray head；The outlet tube
Arrival end is connect with the filter device, and outlet end is connect with the vacuum pump；The grouting spray head and the filter device
It is installed at the agitating device stirring-head.
Further, it is additionally provided with liquid-pressure pick-up in the delivery pipe, is used for real-time monitoring overpressure, and feed back
To the control system.
Further, current meter is additionally provided on the delivery pipe and the outlet tube.
Further, the filter device is made of nonwoven layer and permeable rock layer, is bolted.
A kind of construction method of the microorganism grouting device for reinforcing deep soft clay, comprising the following steps:
(1) agitating device is in place: agitating device being moved to stabilization zone, keeps pile frame vertical；
(2) premixing sinks: during premixing, can feed clear water by the feed liquor system convenient for drilling；
(3) set flow velocity and injection rate: when stirring-head reaches designated depth, every cubic metre of foundation soil of estimation need to inject micro-
The volume of biological solution calculates solution flow velocity according to mixing time, solution initial flow rate and institute is inputted in the control system
State pressure threshold in delivery pipe；
(4) microbial solution and reaction solution prepare: reaction solution and microbial solution concentration can be according to construction speed and soil properties
The factors such as condition are selected；
(5) it injects microbial solution: opening the feed liquor system and the solution recycle system, microbial solution is infused
Enter into foundation soil, and is stirred evenly the two by the agitating device；
(6) it injects reaction solution: reaction solution is injected into ground by the feed liquor system and the solution recycle system
In soil, combine reaction solution sufficiently with microbial solution in foundation soil and soil by the agitating device；
(7) native pore water conductivity detection: by the solution recycle system, native pore water is sucked out, passes through institute
The conductivity value of conductivity measuring device real-time monitoring soil pore water is stated, and feeds back information to the control system；
(8) it is promoted and is stirred: if native pore water conductivity value is providing after the stirring that the control system is continuously obtained
Do not change in period or amplitude of variation within the specified scope, then automatic lifting blender carries out topsoil stirring, otherwise
Continue to repeat step (5)~(7), until meeting condition；
(9) conveyance conduit and stirring-head are cleaned: when the agitating device is promoted to design reinforcement layer absolute altitude, and completing to reinforce
After operation, each pipeline and pressure apparatus and stirring-head are cleaned up with clear water；
(10) it shifts: repeating step (1)~(8), complete all reinforcement operations.
Further, according to the changing rule of pore water conductivity value native after the stirring measured in real time in step (8), if
In one hour the conductivity value of native pore water do not change or amplitude of variation within the specified scope, it is believed that injection solution
It is sufficient, blender can be promoted and be used for the solidification of the upper layer soil body.
Advantageous effects of the invention:
(1) present invention solves the deep soft clay that microorganism method for strengthening handles live low-permeability using the method for stirring
The problem of ground, while avoiding cement pollution caused by natural environment；
(2) pass through liquid electric conductivity measurement device, the conductivity of real-time testing foundation soil pore water, to judge to stir
Whether region microorganism mixed solution is sufficient；
(3) microbial solution and reaction flow velocity are controlled by flow control switch and pressure slurry feeding device,
And real-time monitoring is carried out by current meter；
(4) foundation soil is directlyed adopt as raw material, greatly reduces project cost；
(5) all constructing operations of the present invention are all carried out, it can be achieved that accurately controlling by automatic control system automatically.
Detailed description of the invention
Fig. 1 is embodiment device structural schematic diagram；
Fig. 2 is filter apparatus configuration schematic diagram；
Fig. 3 is conductivity measuring device structural schematic diagram；
In figure, 1, pressure slurry feeding device；2, current meter；3, delivery pipe；4, outlet tube；5, vacuum pump；6, filter device；7,
Blender；8, stirring-head；9, liquid electric conductivity measurement device；10, be in the milk spray head；11, liquid stirring device；12, flow control
Switch；13, liquid-pressure pick-up；14, automatic control system；15, screw is assembled；16, needle punched non-woven fabrics；17, permeable stone；
18, conductivity measuring instrument；19, solution to be measured；20, circular electrode plates.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of microorganism grouting device for reinforcing deep soft clay, including automatic control system 14,
Feed liquor system, conductivity measuring device, solution recycle system and agitating device, specifically, feed liquor system includes and inlet tube
Two inlets of road connection, the flow control switch 12 of corresponding each inlet and the liquid agitation in inlet pipe
Device 11 and pressure slurry feeding device 1, inlet are used for microbial solution feed liquor and reaction solution feed liquor, and two inlets can be used for
It is mixed respectively into the composition solution in reaction solution such as calcium chloride solution and urea liquid through liquid stirring device 11.
Solution recycle system includes delivery pipe 3, outlet tube 4, filter device 6, grouting spray head 10 and vacuum pump 5；Conveying
3 input end of pipe is connect with pressure slurry feeding device 1, and outlet end is connect with grouting spray head 10；4 arrival end of outlet tube and filter device 6
Connection, outlet end is connect with vacuum pump 5；Agitating device uses hollow stirrer pipe 7 and the stirring-head 8 positioned at 7 bottom of stirring pipe,
Delivery pipe 3, outlet tube 4 are arranged in stirring pipe 7, and grouting spray head 10 is mounted on 8 bottom of blender stirring-head, can be turned therewith
It is dynamic, guarantee liquid sprinkling uniformly, bottom spray head 10 can be automatically controled closing, and spray head such as is automatically closed during immersed tube, prevents
Mud enters delivery pipe 3；When blender reaches reinforcement depth, automatically controls spray head 10 and open, carry out cementing operations.Filtering dress
It sets 6 to be similarly installed at stirring-head 8, for aspirating same layer pore water.As shown in Fig. 2, filter device 6 by nonwoven layer 16 and
Permeable rock layer 17 forms, and is bolted, and the later period is facilitated to clean and replace.
As shown in figure 3, conductivity measuring device 9 includes conductivity measuring instrument and two relatively parallel circular electrode plates
20 are constituted, and for measuring liquid electric conductivity in pipeline, 9 the real time measure of conductivity measuring device connecting with solution recycle system is taken out
The hole water conductivity of suction, the conductivity measured can convert to obtain the concentration of calcium ion in the soil body, be fed back to automatic control
System 14 is handled, according to the changing rule of pore water conductivity value native after the stirring measured in real time, if native in one hour
The conductivity of pore water does not change, it is believed that injection solution is sufficient, can promote blender and be used for the upper layer soil body
Solidification.
Preferably, it is additionally provided with liquid-pressure pick-up 13 in delivery pipe 3, is used for real-time monitoring overpressure, and feed back to
Control system.Pressure threshold can be set as needed in automatic control system 14, when being more than setting threshold value, system is adjusted automatically
Save the power of pressure slurry feeding device 1；When bottom spray head 10 blocks, overpressure can be more than normal pressure value in managing, from
Autocontrol system 14 will turn off pressure slurry feeding device 1 and flow control switch 12, prevent from occurring because of the excessive equipment of pressure broken
It is bad.Preferably, it is additionally provided with current meter 2 on delivery pipe 3 and outlet tube 4, for monitoring flow rate of pipelines in real time.
Present apparatus concrete construction method is as follows:
(1) blender is in place: blender is moved to stabilization zone, keeps pile frame vertical；
(2) premixing sinks: during premixing, can feed clear water from pressure slurry feeding device 1 convenient for drilling；
(3) set flow velocity and injection rate: when stirring-head reaches designated depth, every cubic metre of foundation soil of estimation need to inject micro-
The volume of biological solution, general microbial solution volume are 1.2~1.5 times of foundation soil pore volume, and specific value can root
It is selected according to soil condition.Solution flow velocity is calculated according to mixing time, and inputs solution initial flow rate in automatic control system 14
And pressure threshold in delivery pipe 3；
(4) microbial solution and reaction solution prepare: opening flow control switch 12 by automatic control system 14, liquid stirs
Device 11 is mixed, calcium chloride and urea liquid are mixed and made into reaction solution spare and get microbial solution ready, reaction solution and microorganism
Solution concentration can be selected according to factors such as construction speed and soil conditions；
(5) it injects microbial solution: opening pressure slurry feeding device 1, and open grouting spray head 10 and pour into microbial solution
The two is stirred evenly into foundation soil, and through blender；
(6) it injects reaction solution: conveying reaction solution by delivery pipe 3 through excess pressure slurry feeding device 1, and by stirring blade 8
The grouting spray head 10 of bottom spills, and combines reaction solution sufficiently with solution in foundation soil and soil by the rotation of stirring blade 8；
(7) native pore water conductivity detection: external vacuum pump 5 is opened by automatic control system 14 and is aspirated, will be stirred
Mixing blade 8, nearby soil body pore water is sucked out by filter device 6, and enters liquid electric conductivity measurement device by outlet tube 4
9, the concentration of calcium ion in the soil body is obtained according to the conductance rate conversion of real-time monitoring soil pore water, and feed back information to automatic
Control system 14；
(8) promoted and stirred: native pore water conductivity value is one after the stirring that automatic control system 14 is continuously obtained
When not changing in hour, illustrate that microorganism mixed solution is sufficient, automatic lifting blender carries out topsoil stirring, no
Then continue to repeat step (5)~(7), until meeting condition；
(9) conveyance conduit and stirring-head are cleaned: when blender is promoted to design reinforcement layer absolute altitude, and completing reinforcement operation
Afterwards, each pipeline and pressure apparatus and stirring-head are cleaned up with clear water；
(10) it shifts: repeating step (1)~(8), complete all reinforcement operations.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of microorganism grouting device for reinforcing deep soft clay, characterized in that including control system, feed liquor system,
Conductivity measuring device, solution recycle system and agitating device；
The feed liquor system is for controlling microbial solution and reaction solution feed liquor rate；
The solution recycle system is used to microbial solution and reaction solution importing layer soil body to be solidified, and aspirates to be solidified
Layer pore water；
The conductivity measuring device is for solution recycle system aspirated liquid conductivity described in the real time measure, by monitoring conductivity
The variation of value controls the agitating device and is promoted；
The agitating device is for stirring evenly layer soil body to be solidified and microbial solution/reaction solution；
The control system is for controlling each device, system and Information Collecting & Processing and feedback.
2. a kind of microorganism grouting device for reinforcing deep soft clay according to claim 1, characterized in that described
Feed liquor system include with inlet pipe connection at least two inlets, corresponding each inlet flow control switch with
And liquid stirring device and pressure slurry feeding device in the inlet pipe, the liquid stirring device are mixed for reaction solution
It closes.
3. a kind of microorganism grouting device for reinforcing deep soft clay according to claim 2, characterized in that described
Solution recycle system includes delivery pipe, outlet tube, filter device, grouting spray head and vacuum pump；The delivery pipe input end with
The pressure slurry feeding device connection, outlet end is connect with the grouting spray head；The outlet tube arrival end and the filter device
Connection, outlet end is connect with the vacuum pump；The grouting spray head and the filter device are installed in the agitating device
At stirring-head.
4. a kind of microorganism grouting device for reinforcing deep soft clay according to claim 3, characterized in that described
It is additionally provided with liquid-pressure pick-up in delivery pipe, is used for real-time monitoring overpressure, and feed back to the control system.
5. a kind of microorganism grouting device for reinforcing deep soft clay according to claim 3, characterized in that described
Current meter is additionally provided on delivery pipe and the outlet tube.
6. a kind of microorganism grouting device for reinforcing deep soft clay according to claim 3, characterized in that described
Filter device is made of nonwoven layer and permeable rock layer, is bolted.
7. a kind of construction of microorganism grouting device for reinforcing deep soft clay according to claim 1-6
Method, characterized in that the following steps are included:
(1) agitating device is in place: agitating device being moved to stabilization zone, keeps pile frame vertical；
(2) premixing sinks: during premixing, can feed clear water by the feed liquor system convenient for drilling；
(3) set flow velocity and injection rate: when stirring-head reaches designated depth, every cubic metre of foundation soil of estimation need to inject microorganism
The volume of solution calculates solution flow velocity according to mixing time, solution initial flow rate and described defeated is inputted in the control system
Send overpressure threshold value；
(4) microbial solution and reaction solution prepare: reaction solution and microbial solution concentration can be according to construction speed and soil conditions
Etc. factors selected；
(5) it injects microbial solution: opening the feed liquor system and the solution recycle system, microbial solution is injected into
In foundation soil, and the two is stirred evenly by the agitating device；
(6) it injects reaction solution: reaction solution is injected into foundation soil by the feed liquor system and the solution recycle system,
Reaction solution is combined sufficiently with microbial solution in foundation soil and soil by the agitating device；
(7) native pore water conductivity detection: by the solution recycle system, native pore water is sucked out, passes through the electricity
The conductivity value of conductivity measurement device real-time monitoring soil pore water, and feed back information to the control system；
(8) it is promoted and is stirred: if native pore water conductivity value is in the stipulated time after the stirring that the control system is continuously obtained
Do not change in section or amplitude of variation within the specified scope, then automatic lifting blender carries out topsoil stirring, otherwise continues
Step (5)~(7) are repeated, until meeting condition；
(9) conveyance conduit and stirring-head are cleaned: when the agitating device is promoted to design reinforcement layer absolute altitude, and completing reinforcement operation
Afterwards, each pipeline and pressure apparatus and stirring-head are cleaned up with clear water；
(10) it shifts: repeating step (1)~(8), complete all reinforcement operations.
8. a kind of construction method of microorganism grouting device for reinforcing deep soft clay according to claim 7,
It is characterized in, according to the changing rule of pore water conductivity value native after the stirring measured in real time in step (8), if native in one hour
The conductivity value of pore water do not change or amplitude of variation within the specified scope, it is believed that injection solution it is sufficient, can
Blender promotion is used for the solidification of the upper layer soil body.
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