CN214334627U - Small-size microorganism cement moves water and corrodes testing arrangement - Google Patents
Small-size microorganism cement moves water and corrodes testing arrangement Download PDFInfo
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- CN214334627U CN214334627U CN202023111567.6U CN202023111567U CN214334627U CN 214334627 U CN214334627 U CN 214334627U CN 202023111567 U CN202023111567 U CN 202023111567U CN 214334627 U CN214334627 U CN 214334627U
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Abstract
The utility model discloses a small-sized microorganism cement dynamic water erosion testing device, which comprises a fixing device, an erosion device, a control device and a power device; the fixing device comprises two bases, two side vertical frames, a top support and a stirrer base; the erosion device comprises an erosion cylinder, the erosion cylinder is provided with a top cover, the top cover is provided with a water inlet, a top cover hole and a sliding slot hole, a water level line is arranged above the side wall of the erosion cylinder, a fixed support is arranged on the inner side of the erosion cylinder, and a water outlet is arranged below the side wall of the erosion cylinder; the power device comprises a magnetic stirrer; the control device comprises a speed adjusting knob, a temperature adjusting knob, a timing switch, a timing display screen, a motor, a rotating shaft, a permanent magnet and an electric stove plate; the permanent magnet is driven to rotate by the rotation of the speed adjusting knob adjusting motor, the magnet rotates to generate a constantly changing magnetic field, and then the magnetic stirrer in the magnetic field is driven to rotate, and the magnetic stirrer rotates in the solution to enable the water flow to rotate.
Description
Technical Field
The utility model relates to a hydraulic engineering field, more specifically say so, relate to a small-size microorganism cement moves water erosion testing arrangement.
Background
Instability of the surface of the residual soil slope caused by water flow erosion is a common problem in the world. Under the influence of river water flow, on one hand, the bank slope soil body is soaked in water for a long time, so that the internal friction angle and the cohesive force of the soil are reduced, and the loss of the bank soil body is easily caused. On the other hand, the bank slope soil is easy to disintegrate due to long-term rainfall and direct washing of rivers. The microbial cement is based on a microbial induced calcium carbonate precipitation technology, can be used for cementing soil particles so as to enhance the engineering property of soil, has great potential on a solidified bank slope, and needs to test the erosion resistance of a microbial reinforced soil body in advance and determine the disintegration rate of the solidified soil body in order to know the application effect of the microbial cement on the actual bank slope more accurately.
The experimental device for measuring the disintegration rate of the soil body in the laboratory is only suitable for the static water condition and can only simulate the disintegration rate of the soil body on the bank slope in soaking water, but an actual river is always in a flowing state, dynamic water erosion is a main factor causing the bank slope to be damaged, and a microorganism cement dynamic water erosion test needs to be realized, so that a large-scale water tank experiment needs to be carried out, a real bank slope is simulated in a water tank to carry out a scouring test, the process is complicated, the preparation time is long, the material consumption is large, the measurement difficulty is large, the required conditions are high, and the soil bodies with different curing strengths are difficult to test in a short time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, providing a small-size microorganism cement moves water erosion testing arrangement for measure the erosion strength who moves water microorganism cement, with the condition that more accurately simulation microorganism cement was used at true river course bank slope.
The purpose of the utility model is realized through the following technical scheme.
The utility model discloses a small-sized microorganism cement dynamic water erosion testing device, which comprises a fixing device, an erosion device, a control device and a power device;
the fixing device comprises two bases, two side vertical frames, a top support and a stirrer base, wherein one side vertical frame is fixed on each base;
the erosion device comprises an erosion cylinder arranged in the middle of the top end of a stirrer base, a top cover is arranged at the top of the erosion cylinder, a water inlet provided with a water inlet valve, a top cover hole provided with a thermometer and a sliding groove hole provided with a flow meter are arranged on the top cover, a water level line is arranged above the side wall of the erosion cylinder, a fixed support used for placing a microorganism cement sample to be measured is arranged in the middle of the inner side of the erosion cylinder, a water outlet is arranged below the side wall of the erosion cylinder, and a water outlet valve is arranged;
the power device comprises a strip-shaped magnetic stirrer which is placed in the center of the bottom of the inner side of the erosion cylinder and is in a variable magnetic field;
the control device comprises a speed adjusting knob, a temperature adjusting knob, a timing switch, a timing display screen, a motor, a rotating shaft, a permanent magnet and an electric stove plate; the speed adjusting knob, the temperature adjusting knob, the timing switch and the timing display screen are arranged on the front end face of the stirrer base, the motor is vertically arranged in the stirrer base, the rotating shaft is vertically arranged on the upper end face of the motor, two permanent magnets are arranged at the horizontal shaft end of the top of the rotating shaft, and the electric stove plate is arranged on the inner wall of the top end of the stirrer base and is positioned above the permanent magnets; the speed adjusting knob is connected with the motor in a control way, the permanent magnet is driven to rotate by adjusting the rotation of the motor through the speed adjusting knob, the magnet rotates to generate a constantly changing magnetic field, and then the magnetic stirrer in the magnetic field is driven to rotate, and the magnetic stirrer rotates in the solution to rotate the water flow; the inside of the temperature adjusting knob is connected with an electric stove plate to change the temperature of the solution in the erosion cylinder; the timing switch and the timing display screen are attached with timing circuits for setting or recording the time for testing.
The upper surface of the stirrer base is provided with a mica insulating layer; the top support is connected with the two side vertical frames through an adjustable wheel shaft, and the height of the top support is longitudinally adjusted along the two side vertical frames through the adjustable wheel shaft.
The fixed support is composed of four axial iron wires, four radial iron wires and an iron wire grid, the iron wire grid is horizontally arranged and is coaxially arranged with the erosion cylinder, the four radial iron wires are equal in length and are uniformly fixed on the same horizontal plane in the middle of the erosion cylinder, one ends of the four radial iron wires are respectively fixed on the inner wall of the erosion cylinder at equal intervals along the circumferential direction, the other ends of the four radial iron wires are respectively connected with the tops of the four axial iron wires, and the bottoms of the four axial iron wires are respectively connected with the iron wire grid; the water outlet is arranged at the position below the wire mesh grids.
The erosion cylinder is a cylindrical transparent glass cylinder, the top opening of the erosion cylinder is closed, and the bottom of the erosion cylinder is closed; the top cover is a cylindrical glass cover; the size of the top cover hole is larger than that of the thermometer, the sliding groove hole is rectangular, the position, the opening direction and the top cover hole are located on the same diameter and located on two sides of the circle center, and the length of the sliding groove hole is larger than the radius of the wire mesh.
The lower parts of the thermometer and the flow velocity meter respectively enter the erosion cylinder through a top cover hole and a sliding slotted hole, the upper parts of the thermometer and the flow velocity meter are connected with the top support through adjustable wheel shafts, and the height of the thermometer and the position of the flow velocity meter are adjusted through the adjustable wheel shafts.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
(1) the utility model evolves to the flowing water according to the test experiment of the disintegration rate in the still water, applies the principle of the magnetic stirrer to the test of the disintegration rate of the microorganism cement, and drives the water flow in the erosion cylinder to rotate to form a vortex through the circumferential rotation of the magnetic stirrer in the changing magnetic field, thereby creating the flowing water condition and reflecting the real situation of the river channel erosion; and the microbial cement erosion test under different water environment conditions can be realized by controlling the changes of the aqueous solution, the water temperature and the flow rate.
(2) The utility model defines a new disintegration rate and gives a calculation formula, and can quantitatively reflect the erosion resistance of the microbial cement sand column in the flowing water.
(3) The utility model discloses experimental apparatus is little, compares the large-scale basin experiment of microorganism cement erosion resistance test in the past, and the consumptive material is few, and is easy and simple to handle, easily measures the experiment parameter, and test time is short, and is applicable to the quantitative erosion test of microorganism cement under the multiple flowing water environment.
(4) The utility model discloses a small-size microorganism cement moves water erosion test device can go on in the laboratory, can carry out the water that moves of different water environment, different velocity of flow, different temperature and erode the experiment, compare in still water disintegration rate experiment can more truly react the bank slope receive the state of erodeing, can directly test the experiment with making microorganism cement sand post in addition, experimental apparatus is little, and occupation space is little, and the principle is simple, convenient operation.
Drawings
FIG. 1 is a schematic structural view of a small-sized microorganism cement dynamic water erosion test device of the present invention;
FIG. 2 is a schematic view of the internal structure of the base of the agitator in the testing device of the present invention;
FIG. 3 is a top view of the erosion cylinder portion of the test apparatus of the present invention during experimental testing;
fig. 4 is a schematic structural diagram of a fixing bracket portion in the testing device of the present invention.
Reference numerals: 1-a base; 2-side vertical frame; 3-a top support; 4-adjustable wheel axle; 5-a thermometer; 6-a flow meter; 7-eroding the cylinder; 8-a top cover; 9-a water inlet; 10-a water inlet valve; 11-a top cover hole; 12-sliding slotted holes; 13-water line; 14-a fixed support; 15-water outlet; 16-a water outlet valve; 17-a magnetic stirrer; 18-speed adjustment knob; 19-temperature adjusting knob; 20-timing display screen; 21-a time switch; 22-a blender base; 23-the microorganism cement sample to be tested; 24-a motor; 25-a rotating shaft; 26-a permanent magnet; 27-electric hob; 28-mica insulation layer; 29-timing circuit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figures 1 to 4, the utility model discloses small-size microorganism cement moves water and corrodes testing arrangement, including fixing device, erosion device, power device and controlling means.
The fixture includes two bases 1, two side stands 2, a top support 3, and a blender base 22. Two side grudging posts 2 are respectively fixed on the two bases 1, the top support 3 is connected between the two side grudging posts 2 in a sliding mode and keeps horizontal, an adjustable wheel shaft 4 used for adjusting tightness is arranged at the joint of the top support and the top support, and the height of the top support is longitudinally adjusted along the two side grudging posts 2 through the adjustable wheel shaft 4. The upper surface of the stirrer base 22 is a mica insulating layer, the stirrer base 22 is fixed between the two bases 1 and is positioned right below the top support 3, and the top cover hole 11, the sliding groove hole 12 and the top support 3 are ensured to be positioned on the same vertical plane.
The erosion device comprises an erosion cylinder 7 fixed in the middle of the top end of the stirrer base 22, wherein the erosion cylinder 7 is a cylindrical transparent glass cylinder, and the top opening and the bottom opening are closed. The top of the erosion cylinder 7 is provided with a top cover 8, and the top cover 8 is a cylindrical glass cover. The top cover 8 is provided with a water inlet 9 provided with a water inlet valve 10, a top cover hole 11 provided with a thermometer 5 and a sliding groove hole 12 provided with a flow velocity meter 6. A water level line 13 is arranged above the side wall of the erosion cylinder 7, a fixing support 14 for placing a microorganism cement sample 23 to be detected is arranged in the middle of the inner side of the erosion cylinder 7, a water outlet 15 is arranged below the side wall of the erosion cylinder 7, and a water outlet valve 16 is arranged below the side wall of the erosion cylinder.
The size of the top cover hole 11 is slightly larger than that of the thermometer 5, the sliding groove hole 12 is rectangular, the position, the opening direction and the top cover hole 11 are located on the same diameter and located on two sides of the circle center, and the length of the sliding groove hole 12 is slightly larger than the radius of the wire mesh.
The lower parts of the thermometer 5 and the flow velocity meter 6 respectively enter the erosion cylinder 7 through a top cover hole 11 and a sliding slotted hole 12, the upper parts of the thermometer 5 and the flow velocity meter 6 are vertically connected with the top support 3 through an adjustable wheel shaft 4, the height of the thermometer 5 and the upper, lower, left and right positions of the flow velocity meter 6 are adjusted through the adjustable wheel shaft 4, on one hand, immersion of vacuoles of the thermometer 5 into water solution is guaranteed, and on the other hand, the flow velocity meter 6 is guaranteed to be close to a microorganism cement sample 23 to be measured so as to guarantee effectiveness of the measured flow velocity.
The fixed support 4 is composed of four axial iron wires, four radial iron wires and iron wire grids. Iron wire net level sets up and with erosion cylinder 7 coaxial line settings, and four radial iron wires are isometric and evenly fix the same horizontal plane at 7 middle parts of erosion cylinder, and four radial iron wire one end are fixed in 7 inner walls of erosion cylinder along circumferencial direction equidistant respectively, and the other end is connected with four axial iron wire tops respectively, and four axial iron wire bottoms all are connected with the iron wire net check. The water inlet 9 can effectively avoid stopping the backflow of the priming water midway when the water solution is injected. The water outlet 15 is arranged below the wire mesh grid to ensure that the water level line can reach below 23 of the microbial cement sample to be detected after water is discharged. The water level line 13 is determined by the immersion state of the actual sand column in the rotating water flow, so that the microbial cement pattern 23 to be detected can be submerged in the water solution under various flow speed conditions, and the water level line 13 can ensure the normal rotation of the water flow.
The power device comprises a strip-shaped magnetic stirrer 17 which is placed in the center of the bottom of the inner side of the erosion cylinder 7 and is in a variable magnetic field, and the magnetic stirrer 17 is determined according to the size of the erosion cylinder so as to ensure the stirring effect.
The control device comprises a speed adjusting knob 18, a temperature adjusting knob 19, a timing switch 21, a timing display screen 20, a motor 24, a rotating shaft 25, a permanent magnet 26 and an electric stove plate 27. Speed adjusting knob 18, temperature adjusting knob 19, time switch 21, timing display screen 20 set up terminal surface before agitator base 22, motor 24 is vertical to be set up inside agitator base 22, axis of rotation 25 is vertical to be set up in motor 24 up end, the horizontal axle head in axis of rotation 25 top sets up two permanent magnet 26, electric stove dish 27 sets up in agitator base 22 top inner wall, and is located permanent magnet 26 top. The speed adjusting knob 18 is in control connection with the motor 24, the permanent magnet 26 is driven to rotate by adjusting the rotation of the motor 24 through the speed adjusting knob 18, the magnet rotates to generate a constantly changing magnetic field, the magnetic stirrer 17 in the magnetic field is driven to rotate, and the magnetic stirrer 17 rotates in a solution to enable water flow to rotate. The speed adjusting knob 18 controls the rotation speed of the magnetic stirrer 17 by controlling the rotation speed of the connecting motor 24, thereby controlling the flow rate of water. The temperature adjusting knob 19 is internally connected with an electric stove plate 27, can change the temperature of the solution in the erosion cylinder 7 and is used for testing soil disintegration at different temperatures. The time switch 21 and the time display 20 are attached with a timing circuit 29 for setting or recording the time when the test is performed.
The utility model discloses small-size microorganism cement moves water erosion test method, concrete realization process as follows:
the method comprises the following steps: the microorganism cement sample 23 to be detected is a cylinder, the microorganism cement sample 23 to be detected is placed in a drying box to be dried for 24 hours and then weighed, and the initial mass is m0Simultaneously measuring the size of the microbial cement pattern 23 to be measured, wherein the height is h, and the radius is r0Calculating the surface area S, and the formula is as follows:
in the formula: r is0Is the initial radius of the microorganism cement sample to be detected, cm; h is the initial height of the microbial cement sample to be detected, cm.
The top cover 8 is then opened and the microbial cement pattern 23 to be tested is placed in the center of the fixed support 14 in the erosion cylinder 7, and the top cover 8 is closed.
Step two: determining the water flow environment of the eroded soil body to be simulated, measuring the density and the components of the water solution sample of the water flow environment of the eroded soil body to be simulated, and preparing the water solution of the water flow environment of the eroded soil body. Closing the water outlet valve 16, opening the water inlet valve 10 on the top cover 8, connecting the prepared solution, the peristaltic pump and the water inlet 9 through the infusion pipeline, starting the peristaltic pump, slowly injecting the prepared aqueous solution into the erosion cylinder 7, stopping when the water level of the aqueous solution reaches the water level line 13, and closing the water inlet valve 10 after the injection is finished.
The components, density and the like of the prepared aqueous solution are determined according to actual fluid, and various environments such as bank slope scouring of common river channels, coasts, heavy metal rivers and the like can be simulated. The water level line is the water level line when all the microbial cement patterns 23 to be tested are immersed below the water solution when all the rotating speeds are set, and the water flow can be ensured to rotate normally at the water level line 13.
Step three: fixing the thermometer 5 on the top bracket 3, adjusting the adjustable wheel shaft 4 until the glass bubbles of the thermometer 5 submerge in the aqueous solution, measuring the current temperature, and if the current aqueous solution temperature does not reach the required temperature T, rotating the temperature adjusting knob 19 to adjust the temperature. According to the desired temperature T, the temperature adjusting knob 19 is turned, and the thermometer 5 is taken out after standing to wait for the aqueous solution to be heated (or cooled), and observing the reading of the thermometer 5 until the temperature rises and stabilizes to T. Wherein, temperature regulation knob 19 can control the aqueous solution and rise temperature or lower the temperature to the river course that realizes testing different seasons erodees.
Step four: fixing the current meter 6 on the top support 3, immersing the bottom part of the current meter 6 in the water solution and approaching the microorganism cement sample 23 to be measured as much as possible, rotating the speed adjusting knob 18, starting to rotate the magnetic stirrer 17 in the solution and driving the solution to rotate, observing the current meter 6, and reading the reading v of the current meter 6 after the reading of the current meter 6 is stabilized at the required flow speed0And turns on the time switch 21 to start timing.
Wherein, the erosion cylinder 7 can not be separated from the stirrer base 22 in the stirring process, the magnetic stirrer 17 is placed at the bottom of the erosion cylinder 7 in advance before the test, the magnetic stirrer 17 can not be placed after the speed adjusting knob 18 is rotated, and if the magnetic stirrer 17 does not rotate to generate other motions after the speed adjusting knob 18 is rotated, the rotation is stopped and the speed adjusting knob 18 is rotated again.
Step five: after the set test time t, the speed adjusting knob 18 is turned off, after the water flow is stable and returns to a static state, the temperature adjusting knob 19 is turned off, the timing is stopped, the water solution in the erosion cylinder 7 is discharged, and when the water level is reduced below the microbial cement pattern 23 to be tested, the water outlet valve 16 is closed, and the water discharge is stopped.
Step six: adjusting an adjustable wheel shaft 4 at the position of the current meter 6, taking out the current meter 6, opening a top cover 8, taking out the corroded microbial cement sample, putting the corroded microbial cement sample into a drying oven, drying for 24 hours, weighing, and measuring to obtain the residual mass m of the corroded microbial cement sample to be measuredtAnd calculating to obtain the disintegration rate A and the disintegration rate U.
Defining the disintegration rate of soil body as A, then the flow velocity v0And the disintegration rate of the tested microbial cement sample under the condition of the temperature T is as follows:
in the formula: a is the disintegration rate of the soil body,%; m is0The initial mass g of the microbial cement sample to be detected; m istThe remaining mass of the microbiological cement pattern to be tested after erosion, g.
Defining the disintegration rate of the soil body as U, then the flow velocity v0And the disintegration rate of the tested microbial cement sample under the condition of the temperature T is as follows:
in the formula: u is soil disintegration rate, g/(cm)2Min); s is the initial surface area of the microbial cement sample to be detected, cm2(ii) a t is the set test time, min.
Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above specific functions and operations, and the above specific embodiments are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (5)
1. A small-sized microorganism cement dynamic water erosion testing device is characterized by comprising a fixing device, an erosion device, a control device and a power device;
the fixing device comprises two bases (1), two side vertical frames (2), a top support (3) and a stirrer base (22), wherein one side vertical frame (2) is fixed on each of the two bases (1), the top support (3) is connected between the two side vertical frames (2) in a sliding mode and is kept horizontal, and the stirrer base (22) is fixed between the two bases (1) and is located at the lower end of the top support (3);
the erosion device comprises an erosion cylinder (7) placed in the middle of the top end of a stirrer base (22), a top cover (8) is arranged at the top of the erosion cylinder (7), a water inlet (9) provided with a water inlet valve (10), a top cover hole (11) provided with a thermometer (5) and a sliding groove hole (12) provided with a flow meter (6) are formed in the top cover (8), a water level line (13) is arranged above the side wall of the erosion cylinder (7), a fixing support (14) used for placing a to-be-measured microorganism cement pattern (23) is arranged in the middle of the inner side of the erosion cylinder (7), a water outlet (15) is arranged below the side wall of the erosion cylinder (7), and a water outlet valve (16) is arranged;
the power device comprises a strip-shaped magnetic stirrer (17) which is placed in the center of the bottom of the inner side of the erosion cylinder (7) and is in a variable magnetic field;
the control device comprises a speed adjusting knob (18), a temperature adjusting knob (19), a timing switch (21), a timing display screen (20), a motor (24), a rotating shaft (25), a permanent magnet (26) and an electric stove plate (27); the speed adjusting knob (18), the temperature adjusting knob (19), the timing switch (21) and the timing display screen (20) are arranged on the front end face of the stirrer base (22), the motor (24) is vertically arranged inside the stirrer base (22), the rotating shaft (25) is vertically arranged on the upper end face of the motor (24), two permanent magnets (26) are arranged at the top horizontal shaft end of the rotating shaft (25), and the electric stove plate (27) is arranged on the inner wall of the top end of the stirrer base (22) and is positioned above the permanent magnets (26); the speed adjusting knob (18) is in control connection with the motor (24), the speed adjusting knob (18) is used for adjusting the rotation of the motor (24) so as to drive the permanent magnet (26) to rotate, the magnet rotates to generate a constantly changing magnetic field, and then the magnetic stirrer (17) in the magnetic field is driven to rotate, and the magnetic stirrer (17) rotates in the solution to rotate water flow; the inside of the temperature adjusting knob (19) is connected with an electric stove plate (27) to change the temperature of the solution in the erosion cylinder (7); the timing switch (21) and the timing display screen (20) are attached with a timing circuit (29) for setting or recording the time for testing.
2. The small-scale microorganism cement dynamic water erosion test device according to claim 1, wherein the upper surface of the stirrer base (22) is a mica insulation layer; the top support (3) is connected with the two side vertical frames (2) through an adjustable wheel shaft (4), and the height of the top support is longitudinally adjusted along the two side vertical frames (2) through the adjustable wheel shaft (4).
3. The small-sized microorganism cement dynamic water erosion test device according to claim 1, wherein the fixed support (14) is composed of four axial iron wires, four radial iron wires and an iron wire grid, the iron wire grid is horizontally arranged and is coaxially arranged with the erosion cylinder (7), the four radial iron wires are equal in length and are uniformly fixed on the same horizontal plane in the middle of the erosion cylinder (7), one ends of the four radial iron wires are respectively fixed on the inner wall of the erosion cylinder (7) at equal intervals along the circumferential direction, the other ends of the four radial iron wires are respectively connected with the tops of the four axial iron wires, and the bottoms of the four axial iron wires are respectively connected with the iron wire grid; the water outlet (15) is arranged at the position below the wire mesh grids.
4. The small-sized microorganism cement dynamic water erosion test device according to claim 1, wherein the erosion cylinder (7) is a cylindrical transparent glass cylinder with an open top and a closed bottom; the top cover (8) is a cylindrical glass cover; the size of the top cover hole (11) is larger than that of the thermometer (5), the sliding groove hole (12) is rectangular, the position, the opening direction and the top cover hole (11) are located on the same diameter and on two sides of the circle center, and the length of the sliding groove hole (12) is larger than the radius of the wire mesh.
5. The small-sized microorganism cement kinetic water erosion testing device according to the claim 1, characterized in that the lower parts of the thermometer (5) and the flow meter (6) respectively enter the erosion cylinder (7) through a top cover hole (11) and a sliding slotted hole (12), the upper parts of the thermometer (5) and the flow meter (6) are connected with the top bracket (3) through an adjustable wheel axle (4), and the height of the thermometer (5) and the position of the flow meter (6) are adjusted through the adjustable wheel axle (4).
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| CN112577886A (en) * | 2020-12-22 | 2021-03-30 | 天津大学 | Small-sized microorganism cement dynamic water erosion testing device and testing method |
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| CN112577886A (en) * | 2020-12-22 | 2021-03-30 | 天津大学 | Small-sized microorganism cement dynamic water erosion testing device and testing method |
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