CN110470590B - Concrete erosion simulation device - Google Patents
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- CN110470590B CN110470590B CN201910826803.5A CN201910826803A CN110470590B CN 110470590 B CN110470590 B CN 110470590B CN 201910826803 A CN201910826803 A CN 201910826803A CN 110470590 B CN110470590 B CN 110470590B
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- 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
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/0019—Compressive
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0035—Spring
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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Abstract
The invention discloses a concrete erosion simulation device, and belongs to the technical field of concrete durability research. The concrete erosion simulation device includes: the water inlet of the first conveying pipeline is communicated with the solution storage box, and the water outlet of the first conveying pipeline is communicated with the water inlet of the water pump; the water inlet of the second conveying pipeline is communicated with the water outlet of the water pump, and the water outlet of the second conveying pipeline is communicated with the water inlet of the cavity of the concrete sample; a water inlet of the third conveying pipeline is communicated with a cavity water outlet of the concrete sample, and a water outlet of the third conveying pipeline is communicated with the solution storage box; the sample holder clamps the concrete sample, and the third conveying pipeline is provided with a flow rate meter, a manometer and a throttle valve. The concrete erosion simulation device can simulate concrete erosion of stress-chemistry-seepage three-field coupling under high water head pressure, and can research the durability of concrete under running water and high water head pressure for years.
Description
Technical Field
The invention relates to the technical field of concrete durability research, in particular to a concrete erosion simulation device.
Background
The sea is the territory which has been accelerated to develop by human beings, the marine engineering building is rapidly increased in recent years, and with the vigorous development of marine engineering in China, the engineering quantity and the grade of marine concrete are accelerated to increase in future. The ubiquitous cross-sea bridges, diversion tunnels, immersed tube tunnels and the like all indicate that cement concrete buildings in the sea are increasing day by day. However, the ocean is pressure and fluid, and the water solution contains various soluble chemical substances with erosion property, and the complex environmental conditions influence the service durability of the concrete material.
In order to understand the service life of a concrete structure in a hydraulic structure, relevant research is carried out at home and abroad through indoor simulation tests, numerical calculation, simulation and other methods. However, in the prior art, when the service performance of concrete under ocean working conditions is researched, only the experimental condition that the concrete is subjected to ion-doubling corrosion solution under a certain pressure under a static action is generally considered, most of the experiments of concrete corrosion performed by scholars are performed by simply doubling the ion concentration, and the obtained data has no reference value for researching the long-term stability of the hydraulic concrete structure.
Disclosure of Invention
The invention provides a concrete erosion simulation device, which solves or partially solves the technical problem that in the prior art, when the service performance of concrete under an ocean working condition is researched, the concrete erosion test is carried out by simply doubling the ion concentration, so that the obtained data has no reference value for researching the long-term stability of a hydraulic concrete structure.
In order to solve the above technical problem, the present invention provides a concrete erosion simulation apparatus for eroding a concrete sample, wherein the concrete sample is provided with a cavity, and the concrete erosion simulation apparatus includes: the device comprises a water pump, a sample holder, a solution storage box, a first conveying pipeline, a second conveying pipeline and a third conveying pipeline; the water inlet of the first conveying pipeline is communicated with the solution storage box, and the water outlet of the first conveying pipeline is communicated with the water inlet of the water pump; the water inlet of the second conveying pipeline is communicated with the water outlet of the water pump, and the water outlet of the second conveying pipeline is communicated with the water inlet of the cavity of the concrete sample; the water inlet of the third conveying pipeline is communicated with the cavity water outlet of the concrete sample, and the water outlet of the third conveying pipeline is communicated with the solution storage box; the sample holder holds the concrete sample; the third conveying pipeline is provided with a flow rate meter, a pressure meter and a throttle valve, the flow rate meter is arranged between the pressure meter and a water inlet of the third conveying pipeline, and the throttle valve is arranged between the pressure meter and a water outlet of the third conveying pipeline.
Further, the concrete erosion simulation apparatus further includes: a controller; the controller is respectively connected with the water pump, the flow rate meter, the pressure gauge and the throttle valve; the controller receives a flow speed signal sent by the flow speed meter and sends a frequency control signal to the water pump according to the flow speed signal; the controller receives a water pressure signal sent by the pressure gauge and sends an opening control signal to the throttle valve according to the water pressure signal.
Further, the water pump is a variable frequency water pump.
Further, the water pump is a speed-regulating screw pump.
Further, the specimen holder comprises: the device comprises a support, a sleeve, a screw rod, a bearing, a guide rod, a spring, a connecting rod, a pressing plate, a first spring support and a second spring support; the sleeve is fixedly connected with the bracket; the bearing, the guide rod, the spring, the first spring support and the second spring support are all arranged in the sleeve; the middle part of the screw rod is in threaded connection with the bracket, and the bottom of the screw rod is rotatably connected with the bearing; the first end of the guide rod sequentially penetrates through the first spring support and the bearing to be arranged in the cavity of the screw rod, and the second end of the guide rod is fixedly connected with the second spring support; two ends of the spring are respectively sleeved on the first spring support and the second spring support; the first end of the connecting rod is fixedly connected with the second spring support, and the second end of the connecting rod penetrates through the sleeve and is fixedly connected with the pressing plate.
Further, a turntable is fixedly arranged at the top of the screw rod.
Further, the specimen holder further comprises: a sample sealing mechanism; the concrete sample is arranged in the sample sealing mechanism; the sample sealing mechanism is detachably connected with the bracket.
Further, the specimen sealing mechanism includes: two clamping plates and a plurality of connecting rods; one of the two clamping plates is detachably connected with the bracket; the concrete sample is arranged between the two clamping plates, through holes are formed in the two clamping plates, the through holes are communicated with a cavity of the concrete sample, and the through holes are coaxial with the concrete sample; the connecting rods penetrate through one of the two clamping plates and are detachably connected with the other of the two clamping plates.
Furthermore, a rubber ring is arranged at the contact position of the end face of the concrete sample and the clamping plate.
Further, the specimen holder further comprises: a pressure sensor; the pressure sensor is arranged between the second spring support and the connecting rod.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
firstly, because the water inlet of the first conveying pipeline is communicated with the solution storage box, the water outlet of the first conveying pipeline is communicated with the water inlet of the water pump, the water inlet of the second conveying pipeline is communicated with the water outlet of the water pump, the water outlet of the second conveying pipeline is communicated with the cavity water inlet of the concrete sample, the water inlet of the third conveying pipeline is communicated with the cavity water outlet of the concrete sample, and the water outlet of the third conveying pipeline is communicated with the solution storage box, the required solution can be added into the solution storage box, the water pump is started, the solution in the solution storage box is conveyed into the cavity of the concrete sample through the first conveying pipeline, the water pump and the second conveying pipeline in sequence, the solution erodes the concrete sample, the chemical erosion of the concrete material by the actual water environment can be simulated, and then the solution is conveyed to the solution storage box through the third conveying pipeline, so that the solution can be recycled, the resource is saved, and the ion concentration of the solution can be regularly detected and the solution can be replaced.
Secondly, because the sample holder holds the concrete sample, the sample holder can apply pressure to the top of the concrete sample, simulate the bending moment of the upper backfill pressure on the local part of the arch tunnel, effectively simulate the three-dimensional ground stress on the local part of the sample, and improve the defect that the prior device does not well relate to the three-dimensional ground stress action in the process of simulating the hydraulic concrete erosion.
Thirdly, as the third conveying pipeline is provided with the flow rate meter, the manometer and the throttle valve, the flow rate meter is arranged between the pressure gauge and the water inlet of the third conveying pipeline, and the throttle valve is arranged between the pressure gauge and the water outlet of the third conveying pipeline, the flow rate of the solution in the cavity of the concrete sample is accurately obtained through the flow rate meter, and then the frequency of the water pump is controlled, so that the flow rate of the solution flowing into the concrete sample meets the test conditions, and the seepage erosion is simulated; the water pressure in the cavity of the concrete sample is obtained through the pressure gauge, then the opening of the throttle valve is controlled, the water pressure flowing into the concrete sample meets the test conditions, and the concrete erosion test can be carried out under the conditions of accurately controlling the flow speed and applying high water head pressure.
In conclusion, the coupling concrete erosion device can simulate the concrete erosion of three-field coupling of stress-chemistry-seepage under the high water head pressure, so that researchers can study the durability of concrete in running water and high water head pressure states all the year round in water diversion tunnels, submarine tunnels and the like, and the coupling concrete erosion device has a reference value for studying the long-term stability problem of hydraulic concrete structures.
Drawings
Fig. 1 is a schematic structural diagram of a concrete erosion simulation apparatus according to an embodiment of the present invention;
FIG. 2 is a front view of a specimen holder of the concrete erosion simulation apparatus of FIG. 1;
FIG. 3 is a cross-sectional view of a specimen holder of the concrete erosion simulation apparatus of FIG. 2;
fig. 4 is a schematic diagram of an ideal erosion sample model of the concrete erosion simulation apparatus of fig. 1.
Detailed Description
Referring to fig. 1, a concrete erosion simulation apparatus provided in an embodiment of the present invention is configured to erode a concrete sample 10, where the concrete sample has a cavity, and the concrete erosion simulation apparatus includes: water pump 1, sample holder 2, solution storage box 3, first pipeline 4, second pipeline 5 and third pipeline 6.
The water inlet of the first conveying pipeline 4 is communicated with the solution storage box 3, and the water outlet of the first conveying pipeline 4 is communicated with the water inlet of the water pump 1.
The water inlet of the second conveying pipeline 5 is communicated with the water outlet of the water pump 1, and the water outlet of the second conveying pipeline 5 is communicated with the cavity water inlet of the concrete sample 10.
The water inlet of the third conveying pipeline 6 is communicated with the cavity water outlet of the concrete sample 10, and the water outlet of the third conveying pipeline 6 is communicated with the solution storage box 3.
The specimen holder 2 holds a concrete specimen 10.
The third conveying pipeline 4 is provided with a flow rate meter 7, a pressure meter 8 and a throttle valve 9, the flow rate meter 7 is arranged between the pressure meter 8 and a water inlet of the third conveying pipeline 4, and the throttle valve 9 is arranged between the pressure meter 8 and a water outlet of the third conveying pipeline 4.
In the embodiment of the application, the water inlet of the first conveying pipeline 4 is communicated with the solution storage box 3, the water outlet of the first conveying pipeline 4 is communicated with the water inlet of the water pump 1, the water inlet of the second conveying pipeline 5 is communicated with the water outlet of the water pump 1, the water outlet of the second conveying pipeline 5 is communicated with the cavity water inlet of the concrete sample 10, the water inlet of the third conveying pipeline 6 is communicated with the cavity water outlet of the concrete sample 10, and the water outlet of the third conveying pipeline 6 is communicated with the solution storage box 3, so that a required solution can be added into the solution storage box 3, the water pump 1 is started, the solution in the solution storage box 3 is conveyed into the cavity of the concrete sample 10 sequentially through the first conveying pipeline 4, the water pump 1 and the second conveying pipeline 5, the solution erodes the concrete sample 10, chemical erosion is simulated, and then the solution is conveyed into the solution storage box 3 through the third conveying pipeline 6, the solution can be recycled, resources are saved, because the sample holder 2 holds the concrete sample 10, the sample holder 2 can apply pressure to the top of the concrete sample 10, the bending moment of the concrete sample 10 caused by the upper pressure is simulated, because the third conveying pipeline 6 is provided with the flow meter 7, the pressure meter 8 and the throttle valve 9, the flow meter 7 is arranged between the pressure meter 8 and the water inlet of the third conveying pipeline 4, and the throttle valve 9 is arranged between the pressure meter 8 and the water outlet of the third conveying pipeline 4, the solution flow speed in the cavity of the concrete sample 10 is obtained through the flow meter 7, then the frequency of the water pump 1 is controlled, the solution flow speed flowing into the concrete sample 10 meets the requirement, the seepage erosion is simulated, the water pressure in the cavity of the concrete sample 10 is obtained through the pressure meter 8, then the opening degree of the throttle valve 9 is controlled, so that the water pressure flowing into the concrete sample 10 meets the requirement, the simulation of the erosion of the high water head compressive stress can simulate the concrete erosion of the three-field coupling of the high water head compressive stress, the chemistry and the seepage, so that researchers can research the durability of the concrete in running water and high water head pressure states all the year round, such as diversion tunnels, submarine tunnels and the like, and the simulation method has a reference value for researching the long-term stability problem of hydraulic concrete structures.
Specifically, the concrete erosion simulation apparatus further includes: and a controller.
The controller is respectively connected with the water pump 1, the flow rate meter 7, the pressure gauge 8 and the throttle valve 9. In the present embodiment, the controller is connected to the water pump 1, the flow rate meter 7, the pressure gauge 8, and the throttle valve 9 by cables, respectively, to facilitate data transmission.
The controller receives the flow speed signal sent by the flow speed meter 7, obtains flow speed data, compares the flow speed data with a set flow speed threshold value, and sends a frequency control signal to the water pump 1 according to a comparison result; the controller receives the water pressure signal that pressure gauge 8 sent, acquires water pressure data, compares water pressure data and the water pressure threshold value that sets for, sends aperture control signal to choke valve 9 according to the comparison result, realizes automated operation, practices thrift the manpower.
However, when the controller or the cable is damaged, the operator can directly read the data of the flow rate meter 7 and then compare the data with the set value, according to the comparison result, the operator can manually adjust the frequency of the water pump 1, the operator can directly read the data of the pressure gauge 8 and then compare the data with the set value, according to the comparison result, the operator can manually adjust the opening of the throttle valve 9, and the simulation can be normally performed.
Specifically, the water pump 1 is a variable frequency water pump. The water pump 1 is a speed-regulating screw pump, can carry in variable quantity, can keep high discharge pressure even in low flow, and has strong self-priming capability.
Referring to fig. 2-3, sample holder 2 comprises: the device comprises a support 2-1, a sleeve 2-2, a screw rod 2-3, a bearing 2-4, a guide rod 2-5, a spring 2-6, a connecting rod 2-7, a pressing plate 2-8, a first spring 2-9 and a second spring support 2-10.
The stent 2-1 comprises: a top plate 2-01, a bottom plate 2-02 and a connecting plate 2-03.
The top plate 2-01 can be fixedly connected with the connecting plate 2-03 through welding, the bottom plate 2-02 can be fixedly connected with the connecting plate 2-03 through welding, the top plate 2-01 is perpendicular to the connecting plate 2-03, the bottom plate 2-02 is perpendicular to the connecting plate 2-03, and the top plate 2-01 is parallel to the bottom plate 2-02, so that the stability of support is guaranteed.
The sleeve 2-2 is fixedly connected with the bracket 2-1. In the embodiment, the edge of the top of the sleeve 2-2 is welded with a ring plate, the ring plate is provided with a plurality of bolts, and the bolts penetrate through corresponding bolt holes to be fixedly connected with the top plate 2-01 of the support 2-1.
The bearing 2-4, the guide rod 2-5, the spring 2-6, the first spring 2-9 and the second spring support 2-10 are all arranged in the sleeve 2-2.
The middle part of the screw rod 2-3 is in threaded connection with the bracket 2-1. Specifically, in the embodiment, the middle part of the screw rod 2-3 is in threaded connection with the top plate 2-01 of the bracket 2-1 and penetrates through the top plate 2-01, so that the screw rod 2-3 can move up and down. The bottom of the screw rod 2-3 is rotatably connected with the bearing 2-4, the bottom of the screw rod 2-3 can rotate in the bearing 2-4, and the bearing 2-4 does not interfere with the up-and-down motion of the screw rod 2-3.
The first end of the guide rod 2-5 passes through the first spring support 2-9 and the bearing 2-4 in sequence and is arranged in the cavity of the screw rod 2-3. Specifically, in the embodiment, a through hole is formed in the end face of the screw rod 2-3 facing the bearing 2-4, a limiting block is arranged at the top of the guide rod 2-5, the limiting block is circular, the diameter of the limiting block is smaller than the inner diameter of the screw rod 2-3, the diameter of the limiting block is larger than the diameter of the through hole, the guide rod 2-5 is limited, and meanwhile, the interference of the action of the screw rod 2-3 is avoided. The second end of the guide rod 2-5 is fixedly connected with the second spring support 2-10, and in the embodiment, the second end of the guide rod 2-5 is fixedly connected with the second spring support 2-10 through threads. The guide rod 2-5 guides the movement of the bearing 2-4 and the first spring holder 2-9.
Two ends of the spring 2-6 are respectively sleeved on the first spring support 2-9 and the second spring support 2-10.
The first end of the connecting rod 2-7 is fixedly connected with the second spring support 2-10. Specifically, in the present embodiment, the first end of the connecting rod 2-7 can be fixedly connected with the second spring holder 2-10 through a bolt, so as to facilitate disassembly. The second end of the connecting rod 2-7 passes through the sleeve 2-2 and is fixedly connected with the pressure plate 2-8. Specifically, in the present embodiment, the second end of the connecting rod 2-7 passing through the sleeve 2-2 can be fixedly connected with the pressure plate 2-8 through a bolt, which is convenient for disassembly.
The top of the screw rod 2-3 is fixedly provided with a turntable 2-11. Specifically, in the embodiment, the top of the screw rod 2-3 can be fixedly provided with the rotating disc 2-11 through a bolt, so that the screw rod is convenient to disassemble.
When the concrete sample 10 is pressed downwards, the rotating disc 2-11 is rotated, the rotating disc 2-11 drives the middle part of the screw rod 2-3 to rotate on the top plate 2-01 of the bracket 2-1, the bottom of the screw rod 2-3 rotates in the bearing 2-4, meanwhile, the bearing 2-4 is pressed downwards, the bearing 2-4 presses the first spring support 2-9 downwards, the bearing 2-4 and the first spring support 2-9 move downwards along the guide rod 2-5, the first spring support 2-4 presses the spring 2-6, the spring 2-6 presses the second spring support 2-10 downwards, the second spring support 2-10 pulls the top of the guide rod 2-5 to move downwards in the cavity of the screw rod 2-3, meanwhile, the second spring support 2-10 presses the pressing plate 2-8 through the connecting rod 2-7, the press plates 2-8 press on the concrete sample.
The specimen holder 2 further comprises: and a sample sealing mechanism 11.
The concrete sample 10 is arranged in the sample sealing mechanism 11; the sample sealing mechanism 11 is detachably connected with the connecting plate 2-03 of the bracket 2-1, and the sample sealing mechanism 11 is arranged on the bottom plate 2-02 of the bracket 2-1.
The specimen sealing mechanism 10 includes: two clamping plates 11-1 and a plurality of connecting rods 11-2.
One of the two clamping plates 11-1 is detachably connected with the bracket 2-1. Specifically, in the present embodiment, one of the two clamping plates 11-1 may be connected to the bracket 2-1 by a bolt, which facilitates disassembly.
The concrete sample 10 is arranged between two clamping plates 11-1, and the concrete sample 10 is sealed through the two clamping plates 11-1. Through holes are formed in the two clamping plates 11-1 and communicated with the cavity of the concrete sample 10, and the through holes are coaxial with the concrete sample 10, so that the solution can be conveyed conveniently.
A plurality of links 11-2 pass through one of the two clamping plates 11-1 and are detachably connected with the other of the two clamping plates 11-1. Specifically, in this embodiment, the connecting rod 11-2 may be a screw rod, which is threaded through the two clamping plates 11-1 in sequence, and then a nut is tightened on the threaded end of the screw rod, so as to change the distance between the two clamping plates 11-1, and enable the two clamping plates 11-1 to press the concrete sample 10.
And a rubber ring is arranged at the contact position of the end surface of the concrete sample 10 and the clamping plate 11-1, so that the sealing property is further ensured.
The specimen holder 2 further comprises: pressure sensors 2-12.
The pressure sensor 2-12 is arranged between the second spring holder 2-10 and the connecting rod 2-7.
The pressure sensors 2-12 are connected with the controller through cables and are used for sending the upper pressure generated by the sample holder 2 on the concrete sample 10 to the controller, so that workers can conveniently obtain the upper pressure.
In order to more clearly describe the embodiments of the present invention, the following description is made in terms of the method of using the embodiments of the present invention.
The concrete sample 10 is arranged between two clamping plates 11-1, a connecting rod 11-2 sequentially penetrates through the two clamping plates 11-1, then a nut is locked at the threaded end part of the connecting rod 11-2, the distance between the two clamping plates 11-1 is changed, and the two clamping plates 11-1 are enabled to be pressed against the concrete sample 10. The concrete sample 10 is then placed on the bottom plate 2-02 of the bracket 2-1 and one of the two clamping plates 11-1 is connected to the connecting plate 2-03 of the bracket 2-1 by means of a bolt. Referring to fig. 4, the concrete sample 10 is cylindrical, P is the water pressure, and F is the force applied by the sample holder 2 to the concrete sample 10, wherein the size of the concrete sample 10 can be changed according to the test requirements.
Rotating the rotary table 2-11, the rotary table 2-11 drives the middle part of the screw rod 2-3 to rotate on the top plate 2-01 of the bracket 2-1, the bottom of the screw rod 2-3 rotates in the bearing 2-4, meanwhile, the bearing 2-4 is pressed down, the bearing 2-4 presses down the first spring support 2-9, the bearing 2-4 and the first spring support 2-9 move down along the guide rod 2-5, the first spring support 2-4 presses down the spring 2-6, the spring 2-6 presses down the second spring support 2-10, the second spring support 2-10 pulls the top of the guide rod 2-5 to move down in the cavity of the screw rod 2-3, meanwhile, the second spring support 2-10 presses down the press plate 2-8 through the connecting rod 2-7, the press plate 2-8 presses on the concrete sample 10, the bending moment of the concrete sample 10 caused by the upper pressure is simulated. The pressure sensors 2-12 are connected to the controller for sending the upward pressure generated by the sample holder 2 on the concrete sample 10 to the controller, and the operator obtains the upward pressure from the controller.
Add required solution in solution deposit case 3, start water pump 1, the solution of solution deposit case 3 loops through first pipeline 4, water pump 1 and second pipeline 5 and carries to the cavity of concrete sample 10 in, and the solution corrodes concrete sample 10, and the simulation chemical attack then carries to solution deposit case 3 through third pipeline 6 way, makes solution cyclic utilization, resources are saved. When the ion content in the solution is too low, it may be added directly to the solution storage tank 3.
The flow rate of the solution in the cavity of the concrete sample 10 is obtained through the flow meter 7, and then the frequency of the water pump 1 is controlled, so that the flow rate of the solution flowing into the concrete sample 10 meets the requirement, and seepage erosion is simulated.
The water pressure in the cavity of the concrete sample 10 is obtained through the pressure gauge 8, and then the opening degree of the throttle valve 9 is controlled, so that the water pressure flowing into the concrete sample 10 meets the requirement, and the stress corrosion under the high water head is simulated.
And after the erosion simulation test is finished, the water pump 1 is closed, and the first conveying pipeline 4, the second conveying pipeline 5 and the third conveying pipeline 6 are taken away.
And rotating the rotating discs 2-11 in a reverse direction, wherein the rotating discs 2-11 drive the middle parts of the screw rods 2-3 to rotate on the top plates 2-01 of the supports 2-1, the bottoms of the screw rods 2-3 rotate in the bearings 2-4, meanwhile, the bottom parts of the screw rods 2-3 are in contact with the pressure of the bearings 2-4, under the action of the restoring force of the springs 2-6, the second spring supports 2-10 do not press the press plates 2-8 through the connecting rods 2-7 any more, and the press plates 2-8 leave the top of the concrete sample 10. And (3) disassembling the two clamping plates 11-1 from the bracket 2-1, disassembling the nut of the connecting rod 11-2, taking down the concrete sample 10, and testing the service performance of the concrete sample.
The method and the device can simulate the concrete erosion of three coupling fields of stress-chemistry-seepage under the high water head pressure, so that researchers can research the durability of concrete in running water and high water head pressure states all the year round, such as diversion tunnels, submarine tunnels and the like, and have reference value for researching the long-term stability problem of hydraulic concrete structures.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a concrete erosion simulation device for corrode concrete sample, the cavity has been seted up to the concrete sample, its characterized in that, concrete erosion simulation device includes: the device comprises a water pump, a sample holder, a solution storage box, a first conveying pipeline, a second conveying pipeline and a third conveying pipeline;
the water inlet of the first conveying pipeline is communicated with the solution storage box, and the water outlet of the first conveying pipeline is communicated with the water inlet of the water pump;
the water inlet of the second conveying pipeline is communicated with the water outlet of the water pump, and the water outlet of the second conveying pipeline is communicated with the water inlet of the cavity of the concrete sample;
the water inlet of the third conveying pipeline is communicated with the cavity water outlet of the concrete sample, and the water outlet of the third conveying pipeline is communicated with the solution storage box;
the sample holder holds the concrete sample;
the third conveying pipeline is provided with a flow rate meter, a pressure meter and a throttle valve, the flow rate meter is arranged between the pressure meter and a water inlet of the third conveying pipeline, and the throttle valve is arranged between the pressure meter and a water outlet of the third conveying pipeline;
the water pump is a variable frequency water pump;
the water pump is a speed-regulating screw pump;
the specimen holder comprises: the device comprises a support, a sleeve, a screw rod, a bearing, a guide rod, a spring, a connecting rod, a pressing plate, a first spring support and a second spring support;
the sleeve is fixedly connected with the bracket;
the bearing, the guide rod, the spring, the first spring support and the second spring support are all arranged in the sleeve;
the middle part of the screw rod is in threaded connection with the bracket, and the bottom of the screw rod is rotatably connected with the bearing;
the first end of the guide rod sequentially penetrates through the first spring support and the bearing to be arranged in the cavity of the screw rod, and the second end of the guide rod is fixedly connected with the second spring support;
two ends of the spring are respectively sleeved on the first spring support and the second spring support;
the first end of the connecting rod is fixedly connected with the second spring support, and the second end of the connecting rod penetrates through the sleeve and is fixedly connected with the pressing plate.
2. The concrete erosion simulation apparatus of claim 1, further comprising: a controller;
the controller is respectively connected with the water pump, the flow rate meter, the pressure gauge and the throttle valve;
the controller receives a flow speed signal sent by the flow speed meter and sends a frequency control signal to the water pump according to the flow speed signal;
the controller receives a water pressure signal sent by the pressure gauge and sends an opening control signal to the throttle valve according to the water pressure signal.
3. The concrete erosion simulation apparatus of claim 1, wherein:
and a turntable is fixedly arranged at the top of the screw rod.
4. The concrete erosion simulation apparatus of claim 1, wherein the specimen holder further comprises: a sample sealing mechanism;
the concrete sample is arranged in the sample sealing mechanism;
the sample sealing mechanism is detachably connected with the bracket.
5. The concrete erosion simulation apparatus of claim 4, wherein the specimen sealing mechanism comprises: two clamping plates and a plurality of connecting rods;
one of the two clamping plates is detachably connected with the bracket;
the concrete sample is arranged between the two clamping plates, through holes are formed in the two clamping plates, the through holes are communicated with a cavity of the concrete sample, and the through holes are coaxial with the concrete sample;
the connecting rods penetrate through one of the two clamping plates and are detachably connected with the other of the two clamping plates.
6. The concrete erosion simulation apparatus of claim 5, wherein:
and a rubber ring is arranged at the contact position of the end surface of the concrete sample and the clamping plate.
7. The concrete erosion simulation apparatus of claim 1, wherein the specimen holder further comprises: a pressure sensor;
the pressure sensor is arranged between the second spring support and the connecting rod.
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