Scouring starting test device suitable for biological solidified soil

Abstract

The utility model relates to the technical field of solidified soil testing devices, in particular to a scouring starting testing device suitable for biological solidified soil, which comprises a machine table, a water tank, a mold cylinder and a control end, the water tank is fixedly arranged on the machine table, the water tank is cylindrical and transparent, a stirring piece is arranged at the center inside the water tank, a driving part is arranged on the machine table, and the mold cylinder is arranged on the machine table. The output end of the driving part is in transmission connection with the stirring piece; a water inlet and a water outlet are formed in the water tank, a connector is formed in the bottom of the water tank, the mold barrel is detachably arranged at the connector on the outer side of the water tank, a tray is movably arranged in the mold barrel, and a lifting part is arranged on one side of the tray; the device further comprises a flow velocity meter, a pressure sensor, a turbidity sensor and an image acquisition module. Aiming at the technical problem that the existing test device has defects, the biological solidified soil scouring starting test device overcomes the defects of the traditional test device, and improves the efficiency and convenience of the biological solidified soil scouring starting test.

Description

Technical Field

[0001] The utility model relates to the technical field of solidified soil test devices, and particularly relates to a scour start-up test device applicable to biologically solidified soil. Background Technique

[0002] Solidified soil is a soil anti-scour protection method, which resists the scour effect by changing the performance of the bed surface. In order to study the anti-scour performance of solidified soil, researchers usually use traditional test devices including straight-flow water troughs to conduct relevant tests.

[0003] However, such test devices including straight-flow water troughs have significant defects in use. For example, in actual operation, continuous water supply and sand supply are required, but continuous sediment injection is likely to change the flow structure, thus affecting the flow stability. Moreover, the large amount of sediment used also leads to uncontrollability of the test cost and sand source stability.

[0004] In addition, the test objects of such test devices including straight-flow water troughs are usually traditional solidified soil. Traditional solidified soil is solidified with cement-based materials. The cement-based materials can be gelled and solidified by adding water and stirring, and the solidified soil can be directly poured into the mold of the traditional test device. However, the technical requirements of biologically solidified soil are significantly different from those of traditional solidification materials. The biological solidification technology requires continuous pumping of biological cementation liquid into the soil to complete solidification and cannot be directly poured into the traditional test device. That is, the test device including a straight-flow water trough is not applicable to biologically solidified soil. Content of the Utility Model

[0005] Aiming at the technical problem of the defects existing in the existing test devices, the utility model provides a scour start-up test device applicable to biologically solidified soil, which overcomes the defects of the traditional devices and improves the efficiency and convenience of the scour start-up test of biologically solidified soil.

[0006] The technical solution provided by the utility model is: a scouring start-up test device suitable for bio-solidified soil, comprising a machine platform, a water tank, a mold tube and a control end, wherein the water tank is fixedly arranged on the machine platform, the water tank is cylindrical and transparent, a stirring piece is arranged at the inner center of the water tank, a driving part is arranged on the machine platform, and the output end of the driving part is connected to the stirring piece in a transmission manner; at least one water inlet and at least one drain outlet are arranged on the water tank, an interface is arranged at the bottom of the water tank, and the axial center line of the water tank does not coincide with the axial center line of the interface; the mold tube is detachably arranged at the interface outside the water tank, the mold tube is used to fill the test soil sample, and one end of the mold tube is provided with A first opening is provided, and a second opening is provided at the other end of the mold barrel, the first opening is used to communicate with the interface, a tray is movably provided in the mold barrel, a lifting part is provided on the side of the tray away from the interface, and the output end of the lifting part passes through the second opening and is transmission-connected with the tray, so that the tray can move along the extension direction of the mold barrel; the lifting part and the driving part are both electrically connected to the control end; a flow meter, a pressure sensor, a turbidity sensor and an image acquisition module electrically connected to the control end are also provided on the machine platform; the probe of the flow meter extends into the water tank, the pressure sensor and the turbidity sensor are both fixed to the bottom of the water tank, and the image acquisition module is arranged toward the interface.

[0007] Optionally, the axial center line of the flow meter and the axial center line of the interface are symmetrically arranged with the axial center line of the water tank as the axis of symmetry, and the pressure sensor is located directly below the flow meter.

[0008] Optionally, a top plate is provided on the upper portion of the water tank, the drain outlet is provided on the top plate, and the height of the water inlet is lower than the height of the drain outlet.

[0009] Optionally, a water outlet is provided at the bottom of the water tank, a water tank is provided at the bottom of the machine, and also includes a water outlet pipe, the water outlet and the water tank are connected through the water outlet pipe, and a valve body is provided on the communication path between the water outlet and the water tank.

[0010] Optionally, a filter element is fixedly disposed inside the water outlet pipe.

[0011] Optionally, the lifting part includes an actuating cylinder, an output end of the actuating cylinder is fixedly connected to the tray, and a displacement sensor is provided on the actuating cylinder.

[0012] Optionally, the interface is threadedly connected to the first opening, a first seal is provided at the connection between the interface and the mold tube, a second seal is provided on the side of the tray facing the first opening, and the second seal is used to fill the gap between the tray and the inner wall of the mold tube.

[0013] Optionally, stirrups are arranged along the circumference of the outer side of the water tank, and fastening bars are connected between the machine platform and the stirrups.

[0014] Optionally, the driving part is a motor, and the output end of the motor is connected to the stirring part through a transmission rod.

[0015] Optionally, a lighting lamp is arranged above the water tank.

[0016] Beneficial effects

[0017] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects: Aiming at the technical problem of defects existing in the existing test device, the present utility model overcomes the defects of the traditional device and improves the efficiency and convenience of the scouring and starting test of bio-cemented soil.

[0018] Among them, by arranging a stirring part at the center inside the cylindrical water tank, the water flow can flow along the circumferential direction, so that this test device does not require continuous water supply and sand supply. And the mold cylinder can be disassembled. After the soil sample is bio-cemented in the disassembled mold cylinder, it can be directly assembled with the water tank and directly subjected to the scouring and starting test without intermediate transfer of the sample, reducing the disturbance to the bio-cemented soil during the transfer. Description of the drawings

[0019] Figure 1 It is a schematic structural diagram of a scouring and starting test device for bio-cemented soil proposed in an embodiment of the present utility model.

[0020] Figure 2 It is a schematic diagram of the assembly of the lifting part, the mold cylinder and the water tank proposed in an embodiment of the present utility model. Detailed implementation manners

[0021] To further understand the content of the present utility model, the present utility model will be described in detail in combination with the drawings and embodiments.

[0022] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings. The terms such as "first", "second", etc. in the present utility model are set for the convenience of describing the technical solution of the present utility model and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict, and all are within the scope of protection required by the present utility model.

[0023] Embodiment 1

[0024] In combination with the attached Figure 1-2 drawings, this embodiment proposes a scouring initiation test device applicable to biologically solidified soil, including a machine platform 10, a water tank 11, a mold cylinder 12, and a control terminal 13. The water tank 11 is fixedly arranged on the machine platform 10. The water tank 11 is cylindrical and transparent. A stirring member 14 is arranged at the center inside the water tank 11. A driving part 15 is arranged on the machine platform 10, and the output end of the driving part 15 is in transmission connection with the stirring member 14.

[0025] The water tank 11 is provided with at least one water inlet 16 and at least one drain outlet 17, and an interface 18 is provided at the bottom of the water tank 11, and the axial center line of the water tank 11 does not coincide with the axial center line of the interface 18; the mold tube 12 is detachably arranged at the interface 18 outside the water tank 11, and the mold tube 12 is used to fill the test soil sample, and a first opening is provided at one end of the mold tube 12, and a second opening is provided at the other end of the mold tube 12, and the first opening is used to communicate with the interface 18, and a tray 19 is movably arranged in the mold tube 12, and a lifting part 20 is provided on the side of the tray 19 away from the interface 18, and the output end of the lifting part 20 passes through the second opening and is transmission-connected with the tray 19, so that the tray 19 can move along the extension direction of the mold tube 12; the lifting part 20 and the driving part 15 are both electrically connected to the control end 13.

[0026] The machine 10 is also provided with a flow meter 21, a pressure sensor 22, a turbidity sensor and an image acquisition module 23 which are electrically connected to the control terminal 13; the probe of the flow meter 21 extends into the water tank 11, the pressure sensor 22 and the turbidity sensor are both fixed to the bottom of the water tank 11, and the image acquisition module 23 is arranged toward the interface 18.

[0027] In view of the technical problems of defects in existing test devices, this embodiment proposes a scouring start-up test device suitable for bio-solidified soil, which overcomes the defects of traditional test devices and improves the efficiency and convenience of the scouring start-up test of bio-solidified soil. Among them, through the combination of the cylindrical water tank 11 and the stirring member 14, the device does not need to continuously supply water and sand, and uses the mold cylinder 12 as a soil sample container, which can be used for bio-solidification of soil samples, and the prepared bio-solidified soil can be directly loaded on the device for testing, thereby reducing the disturbance of the bio-solidified soil during the transfer process.

[0028] In this embodiment, the control terminal 13 can be a PC or other industrial or civilian control terminal. The water tank 11 can be made of transparent materials such as glass or acrylic, preferably organic glass, so as to facilitate observation. The stirring member 14 is a rotating drum or stirring blade, and the stirring member 14 is driven to rotate by the driving unit 15, and the center of rotation is the axial center line where the center of the cylindrical water tank 11 is located. Among them, in some embodiments, the driving unit 15 is a motor, and the output end of the motor is connected to the stirring member 14 through a transmission rod 31. The image acquisition module 23 is preferably a high-resolution camera.

[0029] The scouring initiation test device for bio-cemented soil in this embodiment operates as follows: Disassemble the mold cylinder 12. Complete the bio-cementation of the soil inside the disassembled mold cylinder 12. The reinforcement principle is the microbial-induced calcium carbonate precipitation technology. Urease produced by microorganisms converts urea and calcium chloride in the cementing liquid into calcium carbonate precipitate with gelling effect, realizing the cementing effect on the soil mass. After the soil is bio-cemented in the mold cylinder 12, reassemble the mold cylinder 12 with the water tank 11, making the interface 18 communicate with the first opening of the mold cylinder 12. At the same time, the lifting part 20 jacks up the tray 19 so that the tray 19 enters the mold from the second opening. The tray 19 can move along the extending direction of the mold cylinder 12 until the tray 19 abuts against the bottom of the bio-cemented soil, thus ensuring that the test soil sample can be pushed into the water tank 11 from the first opening and the second opening.

[0030] After the installation is completed, first store water in the water tank 11 through the water inlet 16 until the water overflows from the drain outlet 17. Then turn on the flowmeter 21, the pressure sensor 22, the turbidity sensor, and the image acquisition module 23, and keep them in communication connection with the control terminal 13. Then use the control terminal 13 to control the lifting part 20 to lift the soil sample in the mold cylinder 12 to a position flush with the bottom surface of the water tank 11. Then start the driving part 15 through the control terminal 13. The driving part 15 drives the stirring member 14 to stir the water flow in the water tank 11, making the water flow in a circumferential direction. Slowly adjust the rotation speed of the stirring member 14 according to the test requirements, and slowly lift the soil sample through the lifting part 20. Since the axial center line of the water tank 11 does not coincide with the axial center line of the interface 18, the soil sample lifted from the interface 18 will be scoured by the rotating water flow.

[0031] When the test officially starts, the water flow starts to rotate at a high speed and the flow rate continuously increases until the bio-cemented soil is scoured until the tiny cemented particles are carried away by the water flow. The image acquisition module 23 can observe and record the situation of the tiny cemented particles being carried away by the water flow under the action of the water flow. At the same time, the change in the suspended matter in the water will also be captured by the turbidity sensor. The flow rate measured by the flowmeter 21 is the starting flow rate of the bio-cemented soil at this moment. Thus, the scouring initiation test device for bio-cemented soil in this embodiment realizes the scouring initiation test in the cylindrical water tank 11, can observe the starting condition of the bio-cemented soil, record the test parameters and results such as the flow rate and pressure at the starting moment, and evaluate the cementing effect of the bio-cemented soil.

[0032] In the above process, since the water in the water tank 11 will continuously flow circumferentially, it is necessary to ensure the stable setting of the water tank 11. In one embodiment, stirrups 29 are arranged along the circumference of the water tank 11 on the outside of the water tank 11, and a fastening strip 30 is connected between the machine platform 10 and the stirrups 29. The stirrups 29 clamp the water tank 11 tightly. The fastening strip 30 is preferably a metal strip or a high-strength nylon strip, etc., and preferably a steel strip. The two ends of the steel strip are connected to the machine platform 10 and the stirrups 29 to pull the water tank 11 and ensure the stability of the setting of the water tank 11.

[0033] In the above working mode, the image acquisition module 23 is used to observe the changes in the water body in the water tank 11 and the state changes of the bio-cemented soil. To improve the clarity of image acquisition, in some embodiments, a lighting lamp 32 can be installed above the water tank 11. The lighting lamp 32 can be suspended or directly installed on the machine platform 10 to illuminate the water tank 11.

[0034] Combined with the foregoing embodiments, it can be seen that in this embodiment, a cylindrical water tank 11 is used. The driving part 15 drives the stirring part 14 to rotate, driving the sediment and water to flow. For the bio-cemented soil located at the interface 18, it will be repeatedly impacted by the water flow circulating in the circumferential direction. At this time, there is no need to continuously supply water and sand to create test conditions. The traditional direct-flow water tank 11 system needs to continuously add water and sand to ensure the stability of the incoming flow, that is, this embodiment overcomes the disadvantages of continuous water and sand supply.

[0035] Moreover, on the basis of using a cylindrical water tank 11, in a further embodiment, the axial center line of the flowmeter 21 and the axial center line of the interface 18 are symmetrically arranged with the axial center line of the water tank 11 as the axis of symmetry, and the pressure sensor 22 is located directly below the flowmeter 21. In the traditional direct-flow water tank 11 test device, sensors are arranged near the soil sample for measurement, and the instrument structure will interfere with the flow field structure in the water. Therefore, different from the direct-flow water tank 11, in the cylindrical water tank 11, at any position on the same arbitrary circumference with the center of the water tank 11 as the center, it can be generally considered that the measured physical values are consistent, that is, sensors such as the flowmeter 21 can be arranged at a position far from the soil sample. In a further embodiment, the flowmeter 21 and the pressure sensor 22 can be arranged at the farthest point from the soil sample, which can minimize the disturbance of in-situ measurement.

[0036] It should be noted that the bio - mineralization technology is different from the general cement - solidified soil. Traditional solidified soil is solidified with cement - based materials. The cement - based materials can be gelled and solidified by adding water and stirring. The cement - solidified soil can be directly stirred and put into the direct - flow water tank 11 test device for solidification, and then washed. However, for bio - solidified soil, bio - cementing liquid needs to be continuously pumped into the soil during the solidification process to complete the solidification. If it is cured well outside the system and then transferred to the direct - flow water tank 11 test device, since the strength of the bio - solidified soil used for washing is not high and it is easily damaged, there is an influence of intermediate sample transfer disturbance in the existing direct - flow water tank 11 test device, which cannot meet the sample preparation requirements of bio - solidified soil. As described in the foregoing embodiments, the mold cylinder 12 in this embodiment can be conveniently disassembled to achieve the bio - solidification of the soil in the mold cylinder 12 before the test. After the solidification is completed, the bio - solidified soil and the mold cylinder 12 are directly installed on the water tank 11 together, thus further avoiding the disturbance caused by the transfer of bio - solidified soil.

[0037] Among them, the connection method between the water tank 11 and the mold cylinder 12 is preferably that the interface 18 is thread - connected to the first opening. A first seal 27 is provided at the connection of the interface 18 and the mold cylinder 12. A second seal 28 is provided on the side of the tray 19 facing the first opening. The second seal 28 is used to fill the gap between the tray 19 and the inner wall of the mold cylinder 12. Thus, on the basis of conveniently realizing the detachable connection, the sealing performance can be ensured to prevent the leakage of water in the water tank 11.

[0038] In one embodiment, a top plate 24 is provided on the upper part of the water tank 11, the drain port 17 is provided on the top plate 24, and the height of the water inlet 16 is lower than the height of the drain port 17. Since during the rotation of water, the situation of lower in the middle and higher on both sides will occur. In order to avoid air in the middle, the water must fill the entire container. Therefore, the setting method of the water inlet 16 and the drain port 17 in this embodiment can ensure that when injecting water into the water tank 11, the water flow fills the entire water tank 11 from bottom to top, fully exhausting the air, so as to ensure the test effect.

[0039] In one embodiment, a water outlet is provided at the bottom of the water tank 11, a water storage tank is provided at the bottom of the machine table 10, and a water outlet pipe 25 is further included. The water outlet and the water storage tank are connected through the water outlet pipe 25, and a valve body is provided on the connecting path between the water outlet and the water storage tank. Thus, a certain amount of water can be stored in the water storage tank for draining the water tank 11 or supplying water to the water tank 11. In a further embodiment, a filter element is fixedly provided inside the water outlet pipe 25. The filter element can be a filter screen, filter cotton or other filter elements to filter the test soil samples in the water body.

[0040] Combined with the foregoing working mode, the lifting part 20 needs to push the tray 19 to lift the test soil sample. In one embodiment, the lifting part 20 includes an actuating cylinder, the output end of the actuating cylinder is fixedly connected to the tray 19, and a displacement sensor 26 is arranged on the actuating cylinder. Among them, the actuating cylinder can be a linear motion mechanism such as a cylinder, a hydraulic cylinder, an electric push rod, etc., and the displacement sensor 26 is preferably an LVDT displacement sensor 26.

[0041] The present invention and its embodiments are schematically described above. The description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative work without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A scour initiation test device suitable for bio-solidified soil, characterized in that: It includes a machine platform, a water tank, a mold cylinder and a control end. The water tank is fixedly arranged on the machine platform. The water tank is cylindrical and transparent. A stirring piece is arranged at the center of the water tank. A driving part is arranged on the machine platform. The output end of the driving part is transmission-connected with the stirring piece. The water trough is provided with at least one water inlet and at least one drain outlet, and an interface is provided at the bottom of the water trough, and the axial center line of the water trough does not coincide with the axial center line of the interface; the mold barrel is detachably arranged at the interface outside the water trough, and the mold barrel is used to fill the test soil sample, and a first opening is provided at one end of the mold barrel, and a second opening is provided at the other end of the mold barrel, and the first opening is used to communicate with the interface, and a tray is movably arranged in the mold barrel, and a lifting part is provided on the side of the tray away from the interface, and the output end of the lifting part passes through the second opening and is transmission-connected with the tray, so that the tray moves along the extension direction of the mold barrel; the lifting part and the driving part are both electrically connected to the control end; The machine platform is also provided with a flow meter, a pressure sensor, a turbidity sensor and an image acquisition module electrically connected to the control end; the probe of the flow meter extends into the water tank, the pressure sensor and the turbidity sensor are both fixed to the bottom of the water tank, and the image acquisition module is arranged toward the interface.

2. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: The axial center line of the flow meter and the axial center line of the interface are symmetrically arranged with the axial center line of the water tank as the symmetry axis, and the pressure sensor is located directly below the flow meter.

3. The scour initiation test device for biosolidified soil according to claim 1, characterized in that: A top plate is arranged on the upper part of the water tank, the drain port is arranged on the top plate, and the height of the water inlet is lower than the height of the drain port.

4. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: The water tank is provided with a water outlet at the bottom, the machine is provided with a water tank at the bottom, and also includes a water outlet pipe, the water outlet and the water tank are connected through the water outlet pipe, and a valve body is provided on the communication path between the water outlet and the water tank.

5. The scour initiation test device for bio-solidified soil according to claim 4, characterized in that: A filter is fixedly arranged inside the water outlet pipe.

6. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: The lifting part comprises an actuating cylinder, an output end of the actuating cylinder is fixedly connected to the tray, and a displacement sensor is arranged on the actuating cylinder.

7. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: The interface is threadedly connected to the first opening, a first seal is provided at the connection between the interface and the mold tube, a second seal is provided on the side of the tray facing the first opening, and the second seal is used to fill the gap between the tray and the inner wall of the mold tube.

8. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: Stirrups are arranged on the outer side of the water tank along the circumference of the water tank, and fastening strips are connected between the machine platform and the stirrups.

9. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: The driving part is a motor, and the output end of the motor is connected to the stirring member through a transmission rod.

10. The scour initiation test device for bio-solidified soil according to claim 1, characterized in that: A lighting lamp is arranged above the water tank.

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