CN112813953A - Device for reinforcing foundation by microorganism ultrasonic grouting and construction method thereof - Google Patents
Device for reinforcing foundation by microorganism ultrasonic grouting and construction method thereof Download PDFInfo
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- CN112813953A CN112813953A CN202011592801.3A CN202011592801A CN112813953A CN 112813953 A CN112813953 A CN 112813953A CN 202011592801 A CN202011592801 A CN 202011592801A CN 112813953 A CN112813953 A CN 112813953A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 28
- 244000005700 microbiome Species 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 title claims abstract description 10
- 239000002689 soil Substances 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 24
- 230000002787 reinforcement Effects 0.000 claims abstract description 18
- 239000011440 grout Substances 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims description 22
- 230000000813 microbial effect Effects 0.000 claims description 20
- 241000894006 Bacteria Species 0.000 claims description 19
- 230000000694 effects Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 10
- 230000001580 bacterial effect Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 241000192023 Sarcina Species 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 abstract description 10
- 241000233866 Fungi Species 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 7
- 230000033558 biomineral tissue development Effects 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000186547 Sporosarcina Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 229940041514 candida albicans extract Drugs 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 238000009630 liquid culture Methods 0.000 description 1
- ISPYRSDWRDQNSW-UHFFFAOYSA-L manganese(II) sulfate monohydrate Chemical compound O.[Mn+2].[O-]S([O-])(=O)=O ISPYRSDWRDQNSW-UHFFFAOYSA-L 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012138 yeast extract 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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a device for reinforcing a foundation by microorganism ultrasonic grouting and a construction method thereof. The device includes the slip casting pipe, the slip casting pipe upside is connected with the ultrasonic energy collector, the ultrasonic energy collector includes ultrasonic horn and ultrasonic transducer, ultrasonic transducer is connected respectively with the upper end of ultrasonic horn and slip casting pipe, the bottom in slip casting hole is equipped with impulse generator, the subaerial ultrasonic sensor that is equipped with of slip casting pipe one side, ultrasonic sensor is connected with the oscilloscope, the upper end and the grout inlet pipe of slip casting pipe are connected, the grout inlet pipe passes through the slip casting pump and is connected with two grout inlet barrels, two grout inlet barrels are equipped with fungus liquid and cementitious solution respectively. The invention can improve the reinforcement uniformity, can reinforce deeper soil body, can diffuse slurry to the periphery from the grouting pipe with holes on the pipe wall under the synergistic action of ultrasonic waves, has larger reinforcement range and higher integrity, ensures the reinforcement uniformity and is suitable for wide soil body types.
Description
Technical Field
The invention relates to the technical field of grouting reinforcement of foundations, in particular to a device for reinforcing a foundation by microorganism ultrasonic grouting and a construction method thereof.
Background
The microbial grouting reinforcement technology is a novel foundation reinforcement method in recent years, and microbial liquid and nutrient salt are poured into soil, and rapid gelation is carried out between soil particles by utilizing the mineralization action of microorganisms to form calcium carbonate crystals, so that the mechanical property of the soil is enhanced, and the strength and the rigidity of the soil are improved. Compared with the traditional cement slurry and the common chemical slurry, the technology has the advantages of low energy consumption, less pollution, ecological environmental protection and the like.
The microorganism grouting reinforcement technology is used for stabilizing engineering of a field gravel soil layer for the first time at 2010 Dutch Daerfu university, and an underground gravel soil layer is successfully reinforced to stabilize horizontal directional drilling, so that the laying of a natural gas pipeline is realized. However, the existing microorganism grouting reinforcement technology is mostly used for reinforcing gravel soil with high permeability, and the large-scale engineering application is less.
The technology is mainly applied to practical engineering and faces the following problems: when the microorganism grouting is used for reinforcing the foundation, the calcium carbonate generated by the mineralization of the microorganism is unevenly distributed at all positions of the soil body due to uneven adsorption of soil particles to the microorganism and uneven mineralization reaction; for low-permeability soil, the current microbial grouting technology has poor effect in treating low-permeability soil due to the problems of compatibility between microbes and soil pores, slow solution flow and the like; when the microorganism is grouted, the solution is easy to remain on the pipe wall, and the grouting pipe is easy to be blocked; microbial reinforcement is a complex biochemical process, and the reinforcement process and the reinforcement effect need to be monitored in real time.
Before the invention, a patent' a method for reinforcing a foundation by microbial circulating grouting (No. CN 105350517B) discloses a novel grouting technology combining microbial liquid and cementing solution pumping and injecting, alternating positive and negative circulation and orthogonal streamline. The patent application of 'low-permeability soil body microorganism reinforcement ultrasonic atomization pressing-in machine and construction method thereof (application publication number CN 110593249A)' discloses a low-permeability soil body microorganism reinforcement ultrasonic atomization pressing-in machine for microorganism reinforcement engineering and a construction method thereof.
Disclosure of Invention
The invention aims to provide a device for reinforcing a foundation by microorganism ultrasonic grouting and a construction method thereof, aiming at the defects in the prior art.
In order to achieve the above object, in a first aspect, the present invention provides a device for reinforcing a foundation by ultrasonic grouting for microorganisms, comprising a grouting pipe inserted into a grouting hole, wherein a portion of the grouting pipe exposed out of the upper side of the grouting hole is connected with an ultrasonic energy concentrator, the ultrasonic energy concentrator comprises an ultrasonic amplitude transformer and an ultrasonic transducer, the ultrasonic transducer is connected with the ultrasonic amplitude transformer and the upper end of the grouting pipe respectively, the ultrasonic transducer is used for providing mechanical energy to vibrate the grouting pipe, the ultrasonic amplitude transformer is used for adjusting the vibration frequency of the ultrasonic transducer, the bottom of the grouting hole is provided with a pulse generator, an ultrasonic sensor is arranged on the ground on one side of the grouting pipe and connected with an oscilloscope, the upper end of the grouting pipe is connected with a grouting pipe, the grouting pipe is connected with a grouting barrel through a grouting pump, the slurry inlet barrels comprise two slurry inlet barrels, and the two slurry inlet barrels are respectively filled with bacterial liquid and cementing solution.
Furthermore, the slurry inlet pipe is a rubber pressurizing rubber pipe.
Furthermore, the slip casting pipe is a stainless steel pipe, and a pipe wall hole is formed in the lower section of the slip casting pipe.
Furthermore, the grouting pipe comprises a plurality of sections, and the plurality of sections of grouting pipes are sequentially in axial threaded connection.
Further, the ultrasonic transducer is connected to the outer side of the grouting pipe in a threaded mode.
Furthermore, a pressure gauge is arranged on the pulp inlet pipe.
Further, the bacterial liquid is a suspension of sarcina pasteurii, and the concentration of the suspension is more than or equal to 109CFU。
Further, the cementing solution is a mixed solution of 0.5-1 mol/L of urea and calcium chloride, and the concentration ratio of the urea solution to the calcium chloride solution is 1: 1.
In a second aspect, the invention also provides a construction method for reinforcing a foundation by microorganism ultrasonic grouting, which comprises the following steps:
the method comprises the following steps: cleaning the surface of soil to be reinforced, and drilling a grouting hole with a required depth;
step two: arranging a pulse generator at the bottom of the grouting hole, and inserting a grouting pipe formed by threaded connection into the grouting hole, wherein the grouting pipe with a pipe wall hole is arranged at the lower section of the grouting hole, and the grouting pipe without the pipe wall hole is arranged at the upper section of the grouting hole;
step three: sequentially connecting a slurry inlet barrel, a grouting pump and a pressure gauge in series by using a slurry inlet pipe, connecting the slurry inlet pipe with the top end of the grouting pipe, and connecting an ultrasonic energy concentrator at the upper end of the grouting pipe in a threaded manner;
step four: arranging an ultrasonic sensor and an oscilloscope on the ground surface of the upper end of the grouting pipe;
step five: inserting a grouting pipe into the grouting hole;
step six: when the grouting pump is started to inject bacteria liquid, the ultrasonic energy concentrator is started, an ultrasonic transducer in the ultrasonic energy concentrator drives the grouting pipe and the bacteria liquid to vibrate, the vibration frequency can be increased by using an ultrasonic amplitude transformer in the period, the bacteria liquid is uniformly distributed in soil body pores, the bacteria liquid is prevented from remaining on the wall of the grouting pipe, after the microbial liquid A is injected, the grouting pump and the ultrasonic energy concentrator are closed, and the mixture is kept stand, so that bacteria in the bacteria liquid are fully adsorbed to the surface of soil particles;
step seven: starting a grouting pump, injecting a cementing solution, controlling grouting pressure through the grouting pump, adjusting the grouting pressure to be in inverse proportion to the permeability of the foundation soil to be reinforced, adjusting the vibration frequency to be low frequency by an ultrasonic amplitude transformer, and allowing the cementing solution and the microbial liquid to fully react to generate calcium carbonate crystal reinforced foundation soil;
step eight: in the reinforcing process, an ultrasonic signal sent by a pulse generator at the bottom end of the grouting pipe is controlled, the ultrasonic signal is collected by an ultrasonic sensor and converted into an electric signal to be fed back to an oscilloscope, and the reinforcing effect is monitored in real time through an image (a change curve of the instantaneous value of a measured signal) fed back on the oscilloscope;
step nine: and repeating the sixth step to the eighth step, monitoring the grouting effect in real time, performing grouting and monitoring and adjusting, and stopping grouting if the grouting effect is monitored to reach the standard.
Has the advantages that: 1) the invention promotes the flow of the slurry in the pores of the soil body through ultrasonic waves, and improves the reinforcement uniformity;
2) the wall of the grouting pipe adopted by the invention is divided into a porous wall and a non-porous wall, and the grouting pipe can be lengthened through the connecting thread, so that the deeper soil body can be reinforced, the grout can be diffused to the periphery from the grouting pipe with the porous wall under the synergistic action of ultrasonic waves, the reinforcing range is larger, and the integrity is higher;
3) an oscilloscope in the ultrasonic detection device can monitor the grouting effect in real time, so that grouting, monitoring and adjustment are carried out simultaneously, and the uniformity of reinforcement is ensured;
4) the invention is suitable for a wide range of soil types, can solve the problem of aperture matching by adopting ultrasonic grouting, and is suitable for both a sandy soil foundation with high permeability and a clay foundation with low permeability.
Drawings
FIG. 1 is a schematic structural diagram of a device for reinforcing a foundation by microbial ultrasonic grouting according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a grouting pipe according to an embodiment of the present invention.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific examples, which are carried out on the premise of the technical solution of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 2, an embodiment of the present invention provides a device for reinforcing a foundation by ultrasonic grouting for microorganisms, including a grouting pipe 3 inserted into a grouting hole 1, where the grouting hole 1 is a hole 1 drilled to a certain depth in a soil body to be reinforced, and the length of the grouting pipe 3 is longer than that of the grouting hole 1, so that an upper end portion of the grouting pipe 3 can be exposed to an upper side of the grouting hole 1. The part of the grouting pipe 3 exposed out of the upper side of the grouting hole 1 is connected with an ultrasonic energy concentrator 4, wherein the ultrasonic energy concentrator 4 comprises an ultrasonic amplitude transformer 5 and an ultrasonic transducer 6, the ultrasonic transducer 6 is connected with the ultrasonic amplitude transformer 5, and the ultrasonic amplitude transformer 5 is used for adjusting the vibration frequency of the ultrasonic transducer 6. An ultrasonic transducer 6 is also connected to the upper end of the grout pipe 3, the ultrasonic transducer 6 preferably being screwed on the outside of the grout pipe 3. The ultrasonic transducer 6 can provide mechanical energy for vibrating the grout pipe 3, and specifically, the ultrasonic transducer 6 vibrates according to the vibration frequency set by the ultrasonic horn 5, and the ultrasonic transducer 6 is connected with the grout pipe 3, so that the grout pipe 3 and the ultrasonic transducer 6 vibrate together. The bottom of the grouting hole 1 is provided with a pulse generator 2, the ground on one side of the grouting pipe 3 is provided with an ultrasonic sensor 7, the ultrasonic sensor 7 is connected with an oscilloscope 8, in the grouting process, the pulse generator 2 is controlled to send out an ultrasonic signal, the ultrasonic signal returned by the soil body can be received by the ultrasonic sensor 7, and the oscilloscope 8 is used for displaying a waveform, so that whether the grouting effect reaches the standard or not can be observed and confirmed. The upper end of slip casting pipe 3 is connected with into thick liquid pipe 9, advances thick liquid pipe 9 and is connected with advancing thick liquid bucket 12 through grouting pump 11, advances thick liquid bucket 12 and includes two, advances thick liquid bucket 12 and is equipped with fungus liquid and cementitious solution respectively. The grouting pump 11 alternately conveys the bacterial liquid and the cementing solution into the grouting hole 1.
The slurry inlet pipe 9 of the embodiment of the invention is preferably a rubber pressurizing rubber pipe. The grouting pipe 3 is preferably a stainless steel pipe, and a pipe wall hole 13 is formed in the lower section of the grouting pipe 3 to improve the grouting effect. In order to adjust the length of the grouting pipe 3 according to the depth of different grouting holes 1, the grouting pipe 3 of the embodiment of the invention comprises a plurality of sections, the length of each section is preferably 1.5m, the pipe diameter is 90mm, and two ends of each section of grouting pipe 3 are provided with an internal thread structure and an external thread structure which are matched with each other, so that a plurality of grouting pipes 3 can be sequentially axially connected in a threaded manner. When the plurality of grouting pipes 3 to be screwed are provided, the wall holes 13 are provided only in a part of the grouting pipes 3, and the grouting pipes 3 having the wall holes 13 are placed on the lower side when they are mounted. Generally, when the foundation to be reinforced is a high-permeability soil body, one section of grouting pipe 3 with pipe wall holes 13 is arranged at the lowest end, and when the foundation to be reinforced is a low-permeability soil body, two sections of grouting pipe 3 with pipe wall holes 13 can be arranged. The grouting pressure can be adjusted by controlling the rotating speed of the grouting pump 11, and in order to adjust the grouting pressure, a pressure gauge 10 is preferably arranged on the grout inlet pipe 9, so that the current grouting pressure is observed through the pressure gauge 10 to control the operation of the grouting pump 11.
The bacterial liquid adopted by the embodiment of the invention is preferably a sporosarcina pasteurianum suspension with the concentration of more than or equal to 109And (4) CFU. The bacterial liquid can be prepared by the following method: the liquid culture medium adopts 20g/L of yeast extract, 10g/L of ammonium chloride, 10mg/L of manganese sulfate monohydrate and 24mg/L of nickel chloride hexahydrate, and the pH value is adjusted to 9.0. The culture temperature was 30 ℃ and the shaking speed was 200 rpm. After the constant-temperature shaking culture is carried out for 24 hours, the concentration of the bacterial liquid is more than or equal to 109And (5) placing the CFU and the bacterial liquid into a refrigerator with the temperature of 4 ℃ for storage for later use. The preferable cementing solution is 0.5-1 mol/L of mixed solution of urea and calcium chloride, and the concentration ratio of the urea solution to the calcium chloride solution is 1: 1.
Based on the above embodiments, those skilled in the art can understand that the invention also provides a construction method for reinforcing a foundation by microorganism ultrasonic grouting, which comprises the following steps:
the method comprises the following steps: cleaning the surface of the soil body to be reinforced, and drilling a grouting hole 1 with the required depth.
Step two: the bottom of the grouting hole is provided with a pulse generator 2, the grouting pipe 3 which is connected by screw threads is inserted into the grouting hole 1, wherein the grouting pipe 3 provided with a pipe wall hole 13 is arranged at the lower section of the grouting hole 1, and the grouting pipe 3 which is not provided with the pipe wall hole 13 is arranged at the upper section of the grouting hole 1. In addition, when the permeability of the foundation soil to be reinforced is low, it is preferable to use two sections of the grouting pipe 3 provided with the pipe wall holes 13, and when the permeability of the foundation soil to be reinforced is high, it is preferable to use one section of the grouting pipe 3 provided with the pipe wall holes 13.
Step three: a slurry inlet barrel 12, a grouting pump 11 and a pressure gauge 10 are sequentially connected in series through a slurry inlet pipe 9, then the slurry inlet pipe 9 is connected with the top end of a grouting pipe 3, and the upper end of the grouting pipe 3 is in threaded connection with an ultrasonic energy collector 4.
Step four: an ultrasonic sensor 7 and an oscilloscope 8 are arranged on the ground surface of the upper end of the grouting pipe 3;
step five: inserting the grouting pipe 3 into the grouting hole 1;
step six: starting the grouting pump 11, starting the ultrasonic energy concentrator 4 when injecting bacteria liquid, driving the grouting pipe 3 and the bacteria liquid to vibrate by the ultrasonic transducer 6 in the ultrasonic energy concentrator 4, increasing the vibration frequency by using the ultrasonic amplitude transformer 5 in the period, uniformly distributing the bacteria liquid in soil pores, preventing the bacteria liquid from remaining on the wall of the grouting pipe, after the microbial liquid A is injected, closing the grouting pump 11 and the ultrasonic energy concentrator 4, and standing to enable bacteria in the bacteria liquid to be fully adsorbed to the surface of soil particles;
step seven: and starting the grouting pump 11, injecting a cementing solution, controlling grouting pressure through the grouting pump 11, adjusting the grouting pressure to be inversely proportional to the permeability of the foundation soil to be reinforced, and adjusting the vibration frequency to be low by the ultrasonic amplitude transformer 5 so that the cementing solution and the microbial solution fully react to generate calcium carbonate crystals to reinforce the foundation soil. Specifically, when the permeability of the foundation soil to be reinforced is low, the grouting pressure is properly increased; conversely, when the permeability of the foundation soil to be reinforced is high, the grouting pressure can be appropriately reduced.
Step eight: in the reinforcing process, an ultrasonic signal sent by the pulse generator 2 at the bottom end of the grouting pipe 3 is controlled, the ultrasonic signal is collected by the ultrasonic sensor 7 and converted into an electric signal to be fed back to the oscilloscope 8, and the reinforcing effect is monitored in real time through an image (a change curve of the instantaneous value of a measured signal) fed back on the oscilloscope 8;
step nine: and repeating the sixth step to the eighth step, monitoring the grouting effect in real time, performing grouting and monitoring and adjusting, and stopping grouting if the grouting effect is monitored to reach the standard. Specifically, the waveform on the oscilloscope is observed in real time during grouting, the grouting reinforcement is continued when the waveform is unstable, and the grouting effect is considered to reach the standard when the waveform on the oscilloscope is stable, namely the grout is uniformly distributed on the soil body, and the grouting is stopped.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to those of ordinary skill in the art. Without departing from the principle of the invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the scope of the invention.
Claims (9)
1. The device for reinforcing the foundation by microbial ultrasonic grouting is characterized by comprising a grouting pipe (3) inserted into a grouting hole (1), wherein the part of the grouting pipe (3) exposed out of the upper side of the grouting hole (1) is connected with an ultrasonic energy concentrator (4), the ultrasonic energy concentrator (4) comprises an ultrasonic amplitude transformer (5) and an ultrasonic transducer (6), the ultrasonic transducer (6) is respectively connected with the ultrasonic amplitude transformer (5) and the upper end of the grouting pipe (3), the ultrasonic transducer (6) is used for providing mechanical energy for vibrating the grouting pipe (3), the ultrasonic amplitude transformer (5) is used for adjusting the vibration frequency of the ultrasonic transducer (6), the bottom of the grouting hole (1) is provided with a pulse generator (2), and the ground on one side of the grouting pipe (3) is provided with an ultrasonic sensor (7), the ultrasonic sensor (7) is connected with the oscilloscope (8), the upper end of the grouting pipe (3) is connected with the slurry inlet pipe (9), the slurry inlet pipe (9) is connected with the slurry inlet barrel (12) through the grouting pump (11), the slurry inlet barrel (12) comprises two slurry inlet barrels (12), and the two slurry inlet barrels (12) are respectively filled with a bacterium solution and a cementing solution.
2. The device for reinforcing the foundation by microbial ultrasonic grouting according to claim 1, wherein the grout inlet pipe (9) is a rubber pressurization rubber pipe.
3. The device for reinforcing the foundation by microbial ultrasonic grouting according to claim 1, wherein the grouting pipe (3) is a stainless steel pipe, and a pipe wall hole (13) is formed in the lower section of the grouting pipe.
4. The device for reinforcing the foundation by microbial ultrasonic grouting according to claim 1, wherein the grouting pipe (3) comprises a plurality of sections, and the plurality of sections of grouting pipes (3) are sequentially and axially connected through threads.
5. The apparatus for microorganism ultrasonic grouting reinforcement of foundation according to claim 1, characterized in that the ultrasonic transducer (6) is screwed on the outside of the grouting pipe (3).
6. The device for reinforcing the foundation by microbial ultrasonic grouting according to claim 1, wherein a pressure gauge (10) is arranged on the grout inlet pipe (9).
7. The device for reinforcing foundation by microbial ultrasonic grouting according to claim 1, wherein the bacterial liquid is sarcina pasteurii suspension with concentration not less than 109CFU。
8. The device for reinforcing the foundation by microbial ultrasonic grouting according to claim 1, wherein the cementing solution is 0.5-1 mol/L of a mixed solution of urea and calcium chloride, and the concentration ratio of the urea solution to the calcium chloride solution is 1: 1.
9. A construction method for reinforcing a foundation by microorganism ultrasonic grouting is characterized by comprising the following steps:
the method comprises the following steps: cleaning the surface of soil to be reinforced, and drilling a grouting hole (1) with a required depth;
step two: arranging a pulse generator (2) at the bottom of the grouting hole, inserting a grouting pipe (3) formed by threaded connection into the grouting hole (1), wherein the grouting pipe (3) provided with a pipe wall hole (13) is arranged at the lower section of the grouting hole (1), and the grouting pipe (3) not provided with the pipe wall hole (13) is arranged at the upper section of the grouting hole (1);
step three: sequentially connecting a slurry inlet barrel (12), a grouting pump (11) and a pressure gauge (10) in series by using a slurry inlet pipe (9), connecting the slurry inlet pipe (9) with the top end of a grouting pipe (3), and connecting an ultrasonic energy concentrator (4) at the upper end of the grouting pipe (3) in a threaded manner;
step four: an ultrasonic sensor (7) and an oscilloscope (8) are arranged on the ground surface of the upper end of the grouting pipe (3);
step five: inserting the grouting pipe (3) into the grouting hole (1);
step six: when a grouting pump (11) is started to inject bacteria liquid, an ultrasonic energy concentrator (4) is started, an ultrasonic transducer (6) in the ultrasonic energy concentrator (4) drives a grouting pipe (3) and the bacteria liquid to vibrate, the vibration frequency can be increased by using an ultrasonic amplitude transformer (5) in the period, the bacteria liquid is uniformly distributed in soil body pores, the bacteria liquid is prevented from remaining on the wall of a grouting pipe, after a microbial liquid A is injected, the grouting pump (11) and the ultrasonic energy concentrator (4) are closed, and the mixture is kept stand, so that bacteria in the bacteria liquid are fully adsorbed to the surfaces of soil particles;
step seven: starting a grouting pump (11), injecting a cementing solution, controlling grouting pressure through the grouting pump (11), adjusting the grouting pressure and the permeability of the foundation soil to be reinforced in inverse proportion, and adjusting the vibration frequency to low frequency by an ultrasonic amplitude transformer (5) to ensure that the cementing solution and the microbial liquid fully react to generate calcium carbonate crystal reinforced foundation soil;
step eight: in the reinforcing process, an ultrasonic signal sent by a pulse generator (2) at the bottom end of a grouting pipe (3) is controlled, the ultrasonic signal is collected by an ultrasonic sensor (7) and converted into an electric signal to be fed back to an oscilloscope (8), and the reinforcing effect is monitored in real time through an image fed back on the oscilloscope (8);
step nine: and repeating the sixth step to the eighth step, monitoring the grouting effect in real time, performing grouting and monitoring and adjusting, and stopping grouting if the grouting effect is monitored to reach the standard.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114808921A (en) * | 2022-04-12 | 2022-07-29 | 三峡大学 | Recyclable spiral-advancing type anchor rod-microorganism grouting reinforcement device and method |
| CN115450198A (en) * | 2022-10-31 | 2022-12-09 | 西安建筑科技大学 | Device for solidifying loess foundation through microorganism pressurized grouting and method for solidifying loess foundation |
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| CN115450198A (en) * | 2022-10-31 | 2022-12-09 | 西安建筑科技大学 | Device for solidifying loess foundation through microorganism pressurized grouting and method for solidifying loess foundation |
| CN115450198B (en) * | 2022-10-31 | 2024-05-14 | 西安建筑科技大学 | Device for solidifying loess foundation through microorganism pressurization grouting and method for solidifying loess foundation |
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