CN113188885A - MICP-based calcareous sand freezing testing device - Google Patents
MICP-based calcareous sand freezing testing device Download PDFInfo
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- CN113188885A CN113188885A CN202110414664.2A CN202110414664A CN113188885A CN 113188885 A CN113188885 A CN 113188885A CN 202110414664 A CN202110414664 A CN 202110414664A CN 113188885 A CN113188885 A CN 113188885A
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- 239000004576 sand Substances 0.000 title claims abstract description 81
- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 title claims abstract description 26
- 238000007710 freezing Methods 0.000 title claims abstract description 20
- 230000008014 freezing Effects 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 72
- 230000007246 mechanism Effects 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000001125 extrusion Methods 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims description 43
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 24
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 24
- 241001330002 Bambuseae Species 0.000 claims description 24
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 24
- 239000011425 bamboo Substances 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 21
- 238000011068 loading method Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 230000003028 elevating effect Effects 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052791 calcium Inorganic materials 0.000 abstract description 26
- 239000011575 calcium Substances 0.000 abstract description 26
- 239000002994 raw material Substances 0.000 abstract description 13
- 230000015271 coagulation Effects 0.000 abstract description 6
- 238000005345 coagulation Methods 0.000 abstract description 6
- 244000005700 microbiome Species 0.000 abstract description 5
- 239000012634 fragment Substances 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 10
- 230000000813 microbial effect Effects 0.000 description 9
- 238000012669 compression test Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
Abstract
The invention provides a calcium sand freezing test device based on MICP, which comprises a test cylinder, a calcium sand coagulation mechanism, a cooling cylinder, an extrusion mechanism and a lifting mechanism, wherein the calcium sand coagulation mechanism comprises a limiting cylinder, a depth finder, an electric control spray head, a feed pipe, a moving mechanism and a main control unit, the feed pipe conveys calcium sand raw materials into the limiting cylinder, unequal and uneven water is added into different limiting cylinders according to the requirements of the test, after the calcium sand is solidified by microorganisms, the limiting cylinder is removed, a sample is left in the test cylinder, the cooling cylinder is lowered to provide a low-temperature environment for the sample, so that the water in the sample is crystallized, then the extrusion mechanism is used for carrying out a pressure test on a plurality of samples, the samples are cracked under pressure, splashed fragments can strike piezoelectric ceramic plates on the cooling cylinder, the performances of the samples in the same time can be judged by triggering the piezoelectric ceramic plates at different positions, the accuracy of the test is ensured.
Description
Technical Field
The invention relates to the technical field of engineering material testing, in particular to a calcium sand freezing testing device based on MICP.
Background
The calcareous sand is widely distributed in the south China sea area, the special deposition environment enables the calcareous sand to have the characteristics of easiness in crushing, high compressibility, low strength and the like, the requirements of actual engineering are difficult to meet, in order to improve the structural strength of the calcareous sand, a flocculating agent or other materials are often used in the engineering to be combined with the calcareous sand to obtain composite materials, such as cement reinforced calcareous sand, nano clay-cement composite modified calcareous sand and the like, along with the continuous development of a microbial mineralization technology, a novel reinforcing technology commonly used at present is to reinforce the calcareous sand by adopting microbial induced calcium carbonate precipitation (MICP for short), the calcareous sand is reinforced by products generated by metabolism of microorganisms, and compared with the traditional cement or nano modified materials, the composite material has the advantages of better durability, less energy consumption and low cost.
The structural strength of the calcareous sand reinforced by the MICP is changed, so that the performance of the calcareous sand needs to be detected before the calcareous sand is applied to engineering construction, and the performance test of the MICP reinforced calcareous sand at present mostly focuses on the shear resistance and the compression resistance, for example, a method for determining the shear strength of the calcareous sand under high stress with the publication number of CN111077027A adopts layered filling to respectively carry out 1500KPa, 3000KPa and 000KPa normal stress single shear tests; the loading observation and test device for the calcareous sand particles, disclosed by the publication number CN211784978U, has the advantages that a loading head can provide load modes of uniform-speed loading, variable-speed loading and mixed uniform-speed and variable-speed loading under the action of a hydraulic machine, so that particle crushing modes under different load actions can be observed conveniently; however, the above two patent documents only perform the shear and compression tests on the calcareous sand structure under normal conditions, and do not consider the test environment under low temperature conditions, and the marine geotechnical engineering often uses calcareous sand as a building material, so that the reinforced calcareous sand is inevitably subjected to liquid or moisture retention, and under the low temperature conditions, the liquid is frozen into crystals, so that the overall structural strength of the calcareous sand is affected, and therefore, the correct performance test result of the calcareous sand cannot be obtained only by performing the tests under normal temperature conditions.
Disclosure of Invention
Therefore, the invention provides a calcium sand freezing test device based on MICP, which is used for uniformly carrying out compression tests after adding water to different degrees in the tests and cooling the tests to obtain the calcium sand performance in different water-containing states and low-temperature states.
The technical scheme of the invention is realized as follows:
the utility model provides a calcareous sand test device that freezes based on MICP, condenses mechanism, cooling cylinder, extrusion mechanism and elevating system including test section of thick bamboo, calcareous sand, the mechanism that condenses includes spacing section of thick bamboo, depth finder, automatically controlled shower nozzle, inlet pipe, moving mechanism and main control unit, spacing section of thick bamboo lateral wall interconnect to be located inside the test section of thick bamboo, depth finder and automatically controlled shower nozzle all set up at spacing section of thick bamboo lateral wall top, and are adjacent automatically controlled shower nozzle is quarter arc apart, moving mechanism drive inlet pipe removes spacing section of thick bamboo top, elevating system and cooling cylinder lateral wall top connection, the cooling cylinder encloses into the cooling chamber, the cooling chamber is located spacing section of thick bamboo top, extrusion mechanism is located the cooling chamber top, the cooling cylinder inner wall is provided with a plurality of piezoceramics pieces, main control unit respectively with extrusion mechanism, elevating system, The depth finder, the electric control spray head, the moving mechanism and the piezoelectric ceramic piece are electrically connected.
Preferably, the extrusion mechanism comprises a hydraulic rod, a lifting plate and a pressurizing head, an output shaft of the hydraulic rod is connected with the top surface of the lifting plate, the pressurizing head is arranged below the lifting plate and above the limiting barrel, and the main control unit is electrically connected with the hydraulic rod.
Preferably, a pressure sensor is arranged on the bottom surface of the pressurizing head, and the main control unit is electrically connected with the pressure sensor.
Preferably, elevating system includes elevator motor, first meshing tooth, first gear, riser and second meshing tooth, elevator motor is connected with cooling cylinder lateral wall top, the vertical range of first meshing tooth is on the cooling cylinder inner wall, the riser sets up at spacing section of thick bamboo lateral wall top to with the vertical axis symmetry in cooling chamber, the riser top is stretched into in the cooling chamber, the second meshing tooth sets up the outer wall at the riser, first gear respectively with first meshing tooth and the meshing of second meshing tooth, the master control unit is connected with the elevator motor electricity.
Preferably, still include the roof, the roof bottom is connected with test section of thick bamboo lateral wall top through branch, main control unit, elevator motor and extrusion mechanism set up on the roof bottom surface.
Preferably, still include the cold water storage cistern, the cold water storage cistern sets up in the roof bottom surface to be connected with spiral cooling tube through conduit, be provided with the water pump on the conduit, be provided with the refrigeration piece in the cold water storage cistern, the main control unit is connected with water pump and refrigeration piece electricity respectively.
Preferably, the inlet pipe includes the bellows that vertical pipe and slope set up, the bellows is close to spacing section of thick bamboo one end and vertical union coupling, and the test section of thick bamboo outside is stretched out to the other end, moving mechanism includes electric putter, electric putter sets up at the test section of thick bamboo inner wall, and its output shaft and vertical pipe outer wall connection, the main control unit is connected with electric control push rod electricity.
Preferably, the test device further comprises a calcareous sand mixing mechanism, wherein the calcareous sand mixing mechanism comprises a mixing cylinder, a condensate storage cylinder and a liquid inlet mechanism, the mixing cylinder is arranged on one side of the condensate storage cylinder, a drainage tip nozzle is arranged at the top of the side wall of the condensate storage cylinder and located above the mixing cylinder, and the mixing cylinder is connected with the top of one end, located outside the test cylinder, of the corrugated pipe; the feed liquor mechanism includes loading board, spring, first rack, second gear, second rack and piston plate, the loading board sets up inside the mixing drum, and its bottom surface passes through the spring and is connected with the interior bottom surface of mixing drum, first rack one end is connected with the loading board bottom surface, and the other end stretches out the outside from the mixing drum bottom surface, the piston plate sets up inside the condensate storage cylinder, second rack one end is connected with piston plate bottom surface, and the other end stretches out the condensate storage cylinder bottom surface outside, the second gear respectively with first rack and the meshing of second rack.
Preferably, calcareous sand mixing mechanism includes conveyer pipe, solenoid valve and dosing mechanism, the conveyer pipe is connected with mixing drum lateral wall bottom, the solenoid valve sets up on the conveyer pipe, dosing mechanism includes the bellying and presses the button, the bellying sets up in the loading board bottom surface, press the button setting in the mixing drum on the bottom surface to be located the bellying below, the main control unit is connected with the solenoid valve and presses the button electricity respectively.
Preferably, still include the display screen, the display screen sets up at the roof top, main control unit and display screen data connection.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a calcium sand freezing test device based on MICP, which is characterized in that a calcium sand raw material is added into a limiting cylinder, the calcium sand is kept stand for coagulation by microbial reaction, different amounts of water can be added into the calcium sand raw material according to actual test requirements in the process of adding the calcium sand raw material, so that the water content and the water distribution of calcium sand tests in different limiting cylinders are different, then the tests are cooled at low temperature through the arranged cooling cylinder, the tests are subjected to compression tests through a squeezing mechanism, the test samples can burst and splash when being subjected to pressure, the splashed test sample fragments can impact a piezoelectric ceramic piece on the cooling cylinder, the piezoelectric ceramic piece generates an electric signal when being subjected to pressure and sends the electric signal to a main control unit, and workers can judge the performances of different tests according to the electric signal data generated by the piezoelectric ceramic pieces at different positions.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of the MICP-based calcareous sand freezing test device according to the present invention;
FIG. 2 is a schematic view of the connection structure of the cooling cylinder and the riser of the MICP-based calcareous sand freezing test device of the present invention;
FIG. 3 is a schematic structural view of a calcareous sand mixing mechanism of a MICP-based calcareous sand freezing test device according to the present invention;
in the figure, 1 is a testing cylinder, 2 is a cooling cylinder, 3 is a limiting cylinder, 4 is a depth finder, 5 is an electric control spray head, 6 is a feeding pipe, 7 is a main control unit, 8 is a cooling cavity, 9 is a piezoelectric ceramic plate, 10 is a hydraulic rod, 11 is a lifting plate, 12 is a pressurizing head, 13 is a pressure sensor, 14 is a lifting motor, 15 is a first meshing tooth, 16 is a first gear, 17 is a vertical plate, 18 is a second meshing tooth, 19 is a top plate, 20 is a support rod, 21 is a cold water tank, 22 is a water conveying pipeline, 23 is a water pump, 24 is a refrigerating plate, 25 is a vertical pipe, 26 is a corrugated pipe, 27 is an electric push rod, 28 is a mixing cylinder, 29 is a condensate storage cylinder, 30 is a drainage tip, 31 is a bearing plate, 32 is a spring, 33 is a first rack, 34 is a second gear, 35 is a second rack, 36 is a piston plate, 37 is a conveying pipe, 38 is an electromagnetic valve, 39 is a bulge, 40 is a pressing button, 41 is a display screen, and 42 is a spiral cooling pipe.
Detailed Description
For a better understanding of the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, the invention provides a calcium sand freezing test device based on MICP, which comprises a test cylinder 1, a calcium sand coagulation mechanism, a cooling cylinder 2, an extrusion mechanism and a lifting mechanism, wherein the calcium sand coagulation mechanism comprises a limiting cylinder 3, a depth finder 4, an electric control spray head 5, a feed pipe 6, a moving mechanism and a main control unit 7, the side walls of the limiting cylinder 3 are connected with each other and are positioned inside the test cylinder 1, the depth finder 4 and the electric control spray head 5 are both arranged at the top of the side wall of the limiting cylinder 3, the adjacent electric control spray heads 5 are separated by a quarter arc, the moving mechanism drives the feed pipe 6 to move above the limiting cylinder 3, the lifting mechanism is connected with the top of the side wall of the cooling cylinder 2, the cooling cylinder 2 encloses a cooling cavity 8, the cooling cavity 8 is positioned above the limiting cylinder 3, the extrusion mechanism is positioned above the cooling cavity 8, and the inner wall of the cooling cylinder 2 is provided with a plurality of piezoelectric ceramic plates 9, the spiral cooling pipe 42 is arranged in the side wall of the main control unit 7, and the main control unit is electrically connected with the extrusion mechanism, the lifting mechanism, the depth finder 4, the electric control spray head 5, the moving mechanism and the piezoelectric ceramic piece 9 respectively.
The invention relates to a calcium sand freezing test device based on MICP, which is used for carrying out compression resistance test on calcium sand solidified by MICP, wherein a moving mechanism can drive a feed pipe 6 to move above a limiting cylinder 3, the feed pipe 6 conveys the calcium sand mixed with microbial cementing liquid into the limiting cylinder 3 for sample preparation, the limiting cylinder 3 can limit the shape of the sample to ensure that the sample is finally cylindrical, the calcium sand raw material is added into the limiting cylinder 3 and then stands for a period of time, after microorganisms metabolize and condense the calcium sand, the limiting cylinder 3 is removed, a lifting mechanism descends a cooling cylinder 2 to ensure that a cooling cavity 8 is positioned outside the sample, the sample is refrigerated by cold water conveyed in the cooling cylinder 2, and a spiral cooling pipe 42 arranged in the cooling cylinder 2 can ensure uniform cooling, residual water in the sample is frozen into crystals, and then the sample is extruded by an arranged extruding mechanism to carry out a compression test.
Specifically, the limiting cylinders 3 of the invention are arranged in a plurality of groups for comparison test, preferably three groups, each limiting cylinder 3 is provided with four electric control nozzles 5 at equal intervals, and is also provided with a depth finder 4, when the calcium sand raw material is conveyed into the limiting cylinder 3 through a feed pipe 6, the depth finders 4 can measure the depth of the raw material in the limiting cylinders 3, and a main control unit 7 can add water into the raw material when the raw material is lifted to a plurality of different heights, the invention arranges the limiting cylinders 3 in a plurality of groups for providing different and uneven water for the calcium sand, when the limiting cylinders 3 are arranged in three groups, the first limiting cylinder 3 does not add water, the four electric control valves of the second limiting cylinder 3 are all opened to realize even water addition, the third limiting cylinder 3 only opens one or two electric control valves to realize uneven water addition, therefore, the water content and the water distribution of three samples are different, after the microorganisms solidify the calcium sand, the limiting cylinder 3 is evacuated, the cooling cylinder 2 is lowered to freeze the samples, the side wall of the cooling cavity 8 defined by the cooling cylinder 2 is provided with the piezoelectric ceramic pieces 9, when the extrusion mechanism penetrates through the cooling cavity 8 to pressurize the samples, the samples can burst under pressure, the burst fragments can splash onto the piezoelectric ceramic pieces 9, the piezoelectric ceramic pieces 9 change the pressure into electric signals and send the electric signals to the main control unit 7, the main control unit 7 processes and stores the received electric signals, and a worker can obtain the pressed states of the different samples at the same time from the main control unit 7 to analyze the performance of the solidified calcium sand of the microorganisms under low-temperature environments with different water contents and different water distributions.
Preferably, the extrusion mechanism includes hydraulic stem 10, lifter plate 11 and adds pressure head 12, the output shaft and the 11 top surfaces of lifter plate of hydraulic stem 10 are connected, add pressure head 12 and set up in lifter plate 11 below, and be located spacing section of thick bamboo 3 top, main control unit 7 is connected with hydraulic stem 10 electricity, it is provided with pressure sensor 13 to add pressure head 12 bottom surface, main control unit 7 is connected with pressure sensor 13 electricity.
The quantity of head 12 adds is unanimous with the quantity of spacing section of thick bamboo 3, and when the pneumatic cylinder drove 11 downstream of lifter plate, lifter plate 11 can drive and add head 12 and move down in step, makes and adds head 12 and passes cooling chamber 8 to add head 12 and can apply pressure and carry out compression test on the sample, can detect the pressure information of applying at the pressure sensor 13 that adds head 12 bottom and set up, and the staff finally can carry out comprehensive judgement according to the performance of pressure information to the sample.
Preferably, elevating system includes elevator motor 14, first meshing tooth 15, first gear 16, riser 17 and second meshing tooth 18, elevator motor 14 is connected with 2 lateral wall tops of cooling cylinder, the vertical range of first meshing tooth 15 is on 2 inner walls of cooling cylinder, riser 17 sets up at 3 lateral wall tops of spacing section of thick bamboo to with 8 vertical axis symmetries in cooling chamber, the riser 17 top is stretched into in the cooling chamber 8, second meshing tooth 18 sets up the outer wall at riser 17, first gear 16 respectively with first meshing tooth 15 and the meshing of second meshing tooth 18, main control unit 7 is connected with elevator motor 14 electricity.
The output shaft of the lifting motor 14 is connected with the top of the side wall of the cooling cylinder 2, so that the cooling cylinder 2 can be driven to lift, when the cooling cylinder 2 moves downwards, under the action of the first meshing teeth 15, the first gear 16 can be driven to rotate, the first gear 16 drives the second meshing teeth 18 on the other side meshed with the first gear to move, the second meshing teeth 18 and the vertical plate 17 move upwards, so that the limiting cylinder 3 can move upwards integrally, the limiting cylinder 3 can move upwards while the cooling cylinder 2 descends, the length of the pressure head 12 is greater than the sum of the lengths of the limiting cylinder 3 and the cooling cylinder 2, and the pressure head 12 can extend into the limiting cylinder 3 to reach the cooling cavity 8 to perform pressure test on a sample.
Preferably, still include roof 19, roof 19 bottom is connected with 1 lateral wall top of test section of thick bamboo through branch 20, main control unit 7, elevator motor 14 and extrusion mechanism set up on roof 19 bottom surface, still include cold water tank 21, cold water tank 21 sets up in roof 19 bottom surface to be connected with spiral cooling tube 42 through conduit 22, be provided with water pump 23 on the conduit 22, be provided with refrigeration piece 24 in the cold water tank 21, main control unit 7 is connected with water pump 23 and refrigeration piece 24 electricity respectively.
The top plate 19 can provide support for the hydraulic rod 10, the lifting motor 14 is also arranged on the top plate 19, the water pump 23 conveys cooling water in the cold water tank 21 to the spiral cooling pipe 42 in the cooling cylinder 2 through the water conveying pipeline 22, the cooling water is conveyed back to the cold water tank 21 by the cooling cylinder 2 for cooling, the main control unit 7 can control the refrigerating sheet 24 to work to cool the water in the cold water tank 21, and the cooling effect of the cooling cylinder 2 on a sample is ensured.
Preferably, the inlet pipe 6 includes the bellows 26 that vertical pipe 25 and slope set up, the bellows 26 is close to the one end and the vertical pipe 25 of spacing section of thick bamboo 3 and is connected, and the other end stretches out test section of thick bamboo 1 outside, moving mechanism includes electric putter 27, electric putter 27 sets up at test section of thick bamboo 1 inner wall, its output shaft and vertical pipe 25 outer wall connection, the main control unit 7 is connected with automatically controlled push rod electricity.
In order to ensure that the cooling cylinder 2 is not blocked by the feeding pipe 6 when descending, the feeding pipe 6 is set to be of a multi-section structure, the electric push rod 27 is used for pushing the vertical pipe 25 to enable the corrugated pipe 26 to stretch and retract and then move to different limiting cylinders 3, so that the calcareous sand mixed with the cementing liquid can be conveyed into the limiting cylinders 3, and after the corrugated pipe 26 is set to be inclined, the raw materials can automatically slide under the gravity.
Preferably, the test tube comprises a calcareous sand mixing mechanism, wherein the calcareous sand mixing mechanism comprises a mixing tube 28, a condensate storage tube 29 and a liquid inlet mechanism, the mixing tube 28 is arranged on one side of the condensate storage tube 29, a drainage tip 30 is arranged on the top of the side wall of the condensate storage tube 29, the drainage tip 30 is positioned above the mixing tube 28, and the mixing tube 28 is connected with the top of one end, positioned outside the test tube 1, of the corrugated tube 26; the feed liquor mechanism includes loading board 31, spring 32, first rack 33, second gear 34, second rack 35 and piston plate 36, loading board 31 sets up inside mixing drum 28, and its bottom surface passes through spring 32 and is connected with the interior bottom surface of mixing drum 28, first rack 33 one end is connected with loading board 31 bottom surface, and the other end stretches out the outside from the mixing drum 28 bottom surface piston plate 36 sets up inside condensate storage cylinder 29, second rack 35 one end is connected with piston plate 36 bottom surface, and the other end stretches out to condensate storage cylinder 29 bottom surface outside, second gear 34 meshes with first rack 33 and second rack 35 respectively.
Before the raw materials are conveyed, the calcareous sand is poured into the mixing cylinder 28, and the microbial cementing liquid in the coagulating liquid storage cylinder 29 can be continuously added into the mixing cylinder 28 through the arranged liquid inlet mechanism when the calcareous sand is poured, so that the calcareous sand and the microbial cementing liquid are uniformly mixed.
When the calcareous sand is poured into the mixing cylinder 28, the bearing plate 31 can compress the spring 32 and move downwards under the action of gravity, so that the first rack 33 can synchronously move downwards, the second gear 34 rotates, the second gear 34 drives the second rack 35 to move upwards, the second rack 35 pushes the piston plate 36 to move upwards, the piston plate 36 pushes the microbial cementing liquid in the coagulation liquid storage cylinder 29 upwards, and the microbial cementing liquid flows into the mixing cylinder 28 through the drainage tip 30, and the calcareous sand can be poured while the microbial cementing liquid is added.
Preferably, calcareous sand mixing mechanism includes conveyer pipe 37, solenoid valve 38 and dosing mechanism, conveyer pipe 37 is connected with mixing drum 28 lateral wall bottom, solenoid valve 38 sets up on conveyer pipe 37, dosing mechanism includes bellying 39 and press button 40, bellying 39 sets up in loading board 31 bottom surface, press button 40 sets up on the bottom surface in mixing drum 28 to be located bellying 39 below, main control unit 7 is connected with solenoid valve 38 and press button 40 electricity respectively.
When the bearing plate 31 descends to enable the convex portion 39 to be in contact with the press button 40, the press button 40 is triggered to generate an electric signal, the main control unit 7 receives the electric signal sent by the press button 40, the control electromagnetic valve 38 is opened, so that the calcareous sand raw material in the mixing cylinder 28 can be conveyed into the corrugated pipe 26 through the conveying pipe 37, and the calcareous sand raw material can fall into the limiting cylinder 3 through the vertical pipe 25 along the obliquely arranged corrugated pipe 26.
Preferably, the display device further comprises a display screen 41, the display screen 41 is arranged on the top of the top plate 19, and the main control unit 7 is in data connection with the display screen 41.
When the sample is pressurized and burst by the pressurizing head 12, the splashed fragments can enable the piezoelectric ceramic piece 9 to generate an electric signal, at the moment, the main control unit 7 positions the burst position of the sample and the type of the sample according to the piezoelectric ceramic piece 9 generating the electric signal, and then corresponding information is displayed on the display screen 41, so that a worker can know the test result of the sample through the display screen 41.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a calcareous sand test device that freezes based on MICP, its characterized in that, includes test cylinder, calcareous sand mechanism of condensing, cooling cylinder, extrusion mechanism and elevating system, calcareous sand mechanism of condensing includes spacing section of thick bamboo, depth finder, automatically controlled shower nozzle, inlet pipe, moving mechanism and main control unit, spacing section of thick bamboo lateral wall interconnect to be located inside the test cylinder, depth finder and automatically controlled shower nozzle all set up at spacing section of thick bamboo lateral wall top, and is adjacent automatically controlled shower nozzle is a quarter arc apart, moving mechanism drive inlet pipe moves to spacing section of thick bamboo top, elevating system and cooling cylinder lateral wall top are connected, the cooling cylinder encloses into the cooling chamber, the cooling chamber is located spacing section of thick bamboo top, extrusion mechanism is located the cooling chamber top, the cooling cylinder inner wall is provided with a plurality of piezoelectricity, and its lateral wall is inside to be provided with spiral cooling tube, the main control unit is respectively and electrically connected with the extrusion mechanism, the lifting mechanism, the depth finder, the electric control spray head, the moving mechanism and the piezoelectric ceramic piece.
2. The MICP-based calcareous sand freezing test device according to claim 1, wherein the extruding mechanism comprises a hydraulic rod, a lifting plate and a pressurizing head, the output shaft of the hydraulic rod is connected with the top surface of the lifting plate, the pressurizing head is arranged below the lifting plate and above the limiting cylinder, and the main control unit is electrically connected with the hydraulic rod.
3. The MICP-based calcareous sand freezing test device according to claim 2, wherein a pressure sensor is arranged on the bottom surface of the pressurizing head, and the main control unit is electrically connected with the pressure sensor.
4. The MICP-based calcareous sand freezing test device according to claim 1, wherein the lifting mechanism comprises a lifting motor, a first engaging tooth, a first gear, a vertical plate and a second engaging tooth, the lifting motor is connected with the top of the side wall of the cooling cylinder, the first engaging tooth is vertically arranged on the inner wall of the cooling cylinder, the vertical plate is arranged at the top of the side wall of the limiting cylinder and is symmetrical about the vertical axis of the cooling cavity, the top end of the vertical plate extends into the cooling cavity, the second engaging tooth is arranged on the outer wall of the vertical plate, the first gear is engaged with the first engaging tooth and the second engaging tooth respectively, and the main control unit is electrically connected with the lifting motor.
5. The MICP-based calcareous sand freezing test device according to claim 4, further comprising a top plate, wherein the bottom of the top plate is connected with the top of the side wall of the test cylinder through a support rod, and the main control unit, the lifting motor and the squeezing mechanism are arranged on the bottom surface of the top plate.
6. The MICP-based calcareous sand freezing testing device according to claim 5, further comprising a cold water tank, wherein the cold water tank is arranged on the bottom surface of the top plate and connected with the spiral cooling pipe through a water conveying pipeline, a water pump is arranged on the water conveying pipeline, a refrigerating sheet is arranged in the cold water tank, and the main control unit is electrically connected with the water pump and the refrigerating sheet respectively.
7. The MICP-based calcareous sand freezing test device according to claim 1, wherein the feeding pipe comprises a vertical pipe and an obliquely arranged corrugated pipe, one end of the corrugated pipe close to the limiting cylinder is connected with the vertical pipe, the other end of the corrugated pipe extends out of the test cylinder, the moving mechanism comprises an electric push rod, the electric push rod is arranged on the inner wall of the test cylinder, the output shaft of the electric push rod is connected with the outer wall of the vertical pipe, and the main control unit is electrically connected with the electric push rod.
8. The MICP-based calcareous sand freezing test device according to claim 7, further comprising a calcareous sand mixing mechanism, wherein the calcareous sand mixing mechanism comprises a mixing cylinder, a condensate storage cylinder and a liquid inlet mechanism, the mixing cylinder is arranged on one side of the condensate storage cylinder, a drainage tip is arranged on the top of the side wall of the condensate storage cylinder, the drainage tip is positioned above the mixing cylinder, and the mixing cylinder is connected with the top of one end of the corrugated pipe, which is positioned outside the test cylinder; the feed liquor mechanism includes loading board, spring, first rack, second gear, second rack and piston plate, the loading board sets up inside the mixing drum, and its bottom surface passes through the spring and is connected with the interior bottom surface of mixing drum, first rack one end is connected with the loading board bottom surface, and the other end stretches out the outside from the mixing drum bottom surface, the piston plate sets up inside the condensate storage cylinder, second rack one end is connected with piston plate bottom surface, and the other end stretches out the condensate storage cylinder bottom surface outside, the second gear respectively with first rack and the meshing of second rack.
9. The MICP-based calcareous sand freezing testing device according to claim 8, wherein the calcareous sand mixing mechanism comprises a delivery pipe, a solenoid valve and a quantitative mechanism, the delivery pipe is connected with the bottom of the side wall of the mixing cylinder, the solenoid valve is arranged on the delivery pipe, the quantitative mechanism comprises a protruding part and a press button, the protruding part is arranged on the bottom surface of the bearing plate, the press button is arranged on the inner bottom surface of the mixing cylinder and is positioned below the protruding part, and the main control unit is electrically connected with the solenoid valve and the press button respectively.
10. The MICP-based calcareous sand freezing test device according to claim 4, further comprising a display screen, wherein the display screen is arranged on the top of the top plate, and the main control unit is in data connection with the display screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110414664.2A CN113188885B (en) | 2021-04-17 | 2021-04-17 | MICP-based calcareous sand freezing testing device |
| PCT/CN2021/122465 WO2022217862A1 (en) | 2021-04-17 | 2021-09-30 | Calcareous sand freezing test device based on micp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110414664.2A CN113188885B (en) | 2021-04-17 | 2021-04-17 | MICP-based calcareous sand freezing testing device |
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| CN113188885B CN113188885B (en) | 2024-01-16 |
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| WO2022217862A1 (en) * | 2021-04-17 | 2022-10-20 | 海南大学 | Calcareous sand freezing test device based on micp |
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| CN117589952B (en) * | 2024-01-18 | 2024-03-29 | 山东省蚕业研究所 | Sweet degree testing arrangement of melon |
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| CN104792627A (en) * | 2015-01-31 | 2015-07-22 | 海南大学 | Large frozen soil direct shear device |
| CN109540630A (en) * | 2019-01-03 | 2019-03-29 | 南京大学 | A kind of microorganism batch reinforces the combination sample preparation device and method of sand |
| CN211927615U (en) * | 2019-12-19 | 2020-11-13 | 中国电建集团华东勘测设计研究院有限公司 | Testing arrangement is observed to granule after calcareous sand test piece is drawn or is pressed |
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