A multi-stage water pressure gradient loading device for concrete impermeability test

Abstract

The application relates to the field of concrete impermeability devices, and discloses a multi-section water pressure gradient loading device for concrete impermeability tests. In the application, the device comprises a test water tank, a multi-section water pressure loading assembly, a concrete test piece fixing assembly, a water seepage amount collecting assembly and a control box. The test water tank is a closed stainless steel tank body. The multi-section water pressure loading assembly is installed between the water outlet of the test water tank and the concrete test piece fixing assembly. The concrete test piece fixing assembly is used for clamping and fixing the concrete test piece. The water seepage amount collecting assembly is arranged below the concrete test piece fixing assembly. The control box is electrically connected with the multi-section water pressure loading assembly and the water seepage amount collecting assembly. Through a plurality of series-connected water pressure adjusting units, multi-section gradient water pressure loading is realized. The gradient water seepage environment of the concrete from the surface layer to the deep layer in the actual engineering can be simulated. The problem that the single-section water pressure loading cannot reflect the change rule of the concrete impermeability performance with the water pressure is solved. More accurate basis is provided for the concrete impermeability grade evaluation.

Description

Technical Field

[0001] This application belongs to the technical field of concrete anti-seepage devices, specifically a multi-stage water pressure gradient loading device for concrete anti-seepage testing. Background Technology

[0002] In the field of concrete durability testing, the testing of concrete impermeability is frequently involved. Impermeability refers to the ability of building materials to resist the penetration of water and other liquid media under certain pressure. Concrete impermeability testers can be used to determine the impermeability grade of concrete and control product quality. Therefore, they are widely used in this field to test the impermeability of concrete materials. Thus, they are a concrete impermeability testing device.

[0003] For example, CN219799158U discloses a concrete permeability testing device, including a permeability tester workbench and multiple specimen permeability molds set on the top of the permeability tester workbench. A limiting component is set on one side of the specimen permeability mold, and a placement cylinder is set on the top of the limiting component. An auxiliary cylinder is set on the side of the limiting component near the permeability tester workbench, and an auxiliary component is set on the top of the auxiliary cylinder. Through the cooperation of the above-mentioned mechanisms, this utility model can ensure the sealing between the placement cylinder and the specimen permeability mold, thereby ensuring the sealing effect. It can also be easily disassembled and installed during the test. At the same time, by setting the auxiliary component, it is convenient to deliver sealing paraffin wax into the multiple placement cylinders during the test, thereby avoiding the problem of having to re-coat the surface of the concrete specimen when the coating is uneven, thus further ensuring the test efficiency. The concrete specimen can be shaped when the sealing paraffin wax is delivered into the placement cylinder.

[0004] However, the application still has some shortcomings. It cannot achieve multi-stage water pressure testing, which makes the anti-seepage test results of the device not accurate enough. Utility Model Content

[0005] The purpose of this application is to provide a multi-stage water pressure gradient loading device for concrete impermeability testing in order to solve the problems mentioned above.

[0006] The technical solution adopted in this application is as follows: A multi-stage water pressure gradient loading device for concrete permeability testing includes a test water tank, a multi-stage water pressure loading component, a concrete specimen fixing component, a seepage acquisition component, and a control box. The test water tank is a sealed stainless steel box. The multi-stage water pressure loading component is installed between the outlet of the test water tank and the concrete specimen fixing component. The concrete specimen fixing component is used to clamp and fix the concrete specimen. The seepage acquisition component is located below the concrete specimen fixing component. The control box is electrically connected to the multi-stage water pressure loading component and the seepage acquisition component.

[0007] In a preferred embodiment, the multi-stage water pressure loading assembly includes multiple water pressure regulating units connected in series, and each water pressure regulating unit includes an electromagnetic regulating valve, a pressure sensor, and a one-way valve.

[0008] In a preferred embodiment, the concrete specimen fixing assembly includes a base, an upper pressure cap, clamping bolts, and a sealing gasket. The base has a water-permeable hole at its center, which is connected to the water outlet pipe of the multi-segment water pressure loading assembly. The upper pressure cap is connected to the base by multiple clamping bolts. The sealing gasket is made of nitrile rubber, and its inner diameter is the same as the diameter of the water-permeable hole.

[0009] In a preferred embodiment, the seepage acquisition component includes a water collection funnel, a measuring cylinder, and a weight sensor. The large end of the water collection funnel is directly below the water-permeable hole of the concrete specimen fixing component, and the small end extends into the measuring cylinder. The measuring cylinder is made of transparent glass, and the weight sensor is electrically connected to the control box.

[0010] In a preferred embodiment, the control box includes an industrial touch screen, a PLC controller, and a data storage unit. The industrial touch screen can set the loading value and holding time for each water pressure segment.

[0011] In a preferred embodiment, the test water tank is equipped with a liquid level sensor and an electric heating tube.

[0012] In a preferred embodiment, the outlet pipe of the multi-stage water pressure loading assembly is made of stainless steel and the outside of the pipe is wrapped with insulation cotton, and a filter is provided between the electromagnetic regulating valve and the pressure sensor.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are: 1. By using multiple series-connected water pressure regulating units, multi-stage gradient water pressure loading can be achieved, which can simulate the gradient water seepage environment of concrete from the surface to the depth in actual engineering, and solve the problem that traditional single-stage water pressure loading cannot reflect the law of change of concrete impermeability with water pressure; the design of the buffer chamber eliminates pressure fluctuations during gradient switching, providing a more accurate basis for the evaluation of concrete impermeability grade.

[0014] 2. The double sealing gaskets and precise tightening torque control of the concrete specimen fixing component, along with the triple design of "funnel + measuring cylinder + weight sensor" for the seepage measurement component, reduce the error compared to the traditional measurement method that only uses a measuring cylinder. At the same time, the specimen preheating and water temperature constant temperature control avoid measurement deviations caused by temperature differences, making it suitable for the high-precision testing needs of the laboratory. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall assembly structure of the multi-stage water pressure gradient loading device for concrete impermeability testing in this application. Figure 2 This is a schematic diagram of the multi-stage hydraulic loading component structure in this application; Figure 3 This is a cross-sectional structural diagram of the concrete specimen fixing assembly in this application; Figure 4 This is a schematic diagram of the seepage measurement component and the specimen preheating component in this application.

[0016] The following are labeled in the diagram: 1. Test water tank; 2. Multi-stage water pressure loading assembly; 3. Concrete specimen fixing assembly; 4. Water seepage acquisition assembly; 5. Control box; 6. Concrete specimen; 7. Electromagnetic regulating valve; 8. One-way valve; 9. Water pressure regulating unit; 10. Base; 11. Upper pressure cover; 12. Clamping bolt; 13. Sealing gasket; 14. Water permeable hole; 15. Water collection funnel; 16. Measuring cylinder; 17. Industrial touch screen. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Example: Reference Figure 1-4 A multi-stage water pressure gradient loading device for concrete permeability testing is disclosed, comprising a test water tank 1, a multi-stage water pressure loading component 2, a concrete specimen fixing component 3, a seepage acquisition component 4, and a control box 5. The test water tank 1 is a sealed stainless steel box. The multi-stage water pressure loading component 2 is installed between the outlet of the test water tank 1 and the concrete specimen fixing component 3. The concrete specimen fixing component 3 is used to clamp and fix the concrete specimen 6. The seepage acquisition component 4 is located below the concrete specimen fixing component 3. The control box 5 is electrically connected to the multi-stage water pressure loading component 2 and the seepage acquisition component 4 respectively. The core components and basic functions of each component of the device are clearly defined, and a complete permeability testing framework of "water storage-loading-fixing-acquisition-control" is constructed. This solves the problem that traditional devices only perform single-stage water pressure loading and cannot simulate the actual gradient seepage environment, providing hardware support for the accurate testing of concrete permeability performance.

[0019] Reference Figure 1-3The multi-stage water pressure loading component 2 includes multiple water pressure regulating units 9 connected in series. Each water pressure regulating unit 9 includes an electromagnetic regulating valve 7, a pressure sensor, and a one-way valve 8. The multi-unit series design realizes multi-gradient water pressure loading, which can meet the requirements of impermeability test of concrete with different strength grades. The cooperation between the electromagnetic regulating valve 7 and the pressure sensor ensures that the water pressure of each stage is precise and controllable. The buffer chamber eliminates the pressure shock during gradient switching, ensuring the stability and accuracy of test data.

[0020] Reference Figure 1-3 The concrete specimen fixing assembly 3 includes a base 10, an upper pressure cap 11, clamping bolts 12, and a sealing washer 13. The base 10 has a water-permeable hole 14 in the center, which is connected to the water outlet pipe of the multi-segment water pressure loading assembly 2. The upper pressure cap 11 is connected to the base 10 by multiple clamping bolts 12. The sealing washer 13 is made of nitrile rubber, and the inner diameter of the sealing washer 13 is the same as the diameter of the water-permeable hole 14. The cooperation between the clamping bolts 12 and the sealing washer 13 ensures that there is no leakage between the concrete specimen 6 and the fixing assembly, and avoids the test water from overflowing from the contact surface and affecting the measurement of seepage. The size design of the water-permeable hole 14 ensures that the water pressure is applied evenly to the surface of the specimen. The rigid structure of the base 10 and the upper pressure cap 11 prevents the specimen from deforming under high pressure and improves the reliability of the test.

[0021] Reference Figure 1-4 The seepage acquisition component 4 includes a water collection funnel 15, a measuring cylinder 16, and a weight sensor. The large end of the water collection funnel 15 faces the bottom of the permeable hole 14 of the concrete specimen fixing component 3, and the small end extends into the measuring cylinder 16. The measuring cylinder 16 is made of transparent glass. The weight sensor is electrically connected to the control box 5. The water collection funnel 15 ensures that all seepage water flows accurately into the measuring cylinder 16, avoiding seepage water loss. The dual measurement design of the weight sensor and the measuring cylinder not only allows for intuitive reading of the seepage volume through the measuring cylinder, but also improves measurement accuracy through weight data calibration. The real-time data transmission function allows the control box 5 to record the changes in seepage volume under different water pressure gradients, providing complete data for seepage resistance performance analysis.

[0022] Reference Figure 1-4 The control box 5 includes an industrial touch screen 17, a PLC controller, and a data storage unit. The industrial touch screen 17 can set the loading value and holding time of each water pressure segment. The visual operation interface reduces the difficulty of test operation, and operators can complete the parameter setting without professional skills. The PLC controller ensures precise control of water pressure loading and holding, avoiding errors from manual adjustment. The data storage and export functions facilitate the traceability and analysis of test data, adapting to the needs of batch laboratory tests.

[0023] Reference Figure 1-4The test water tank 1 is equipped with a liquid level sensor and an electric heating tube. The liquid level sensor is used to monitor the water level in the tank. When the water level is lower than the preset value, the control box 5 issues a water replenishment alarm. The electric heating tube is linked with the temperature sensor to avoid temperature fluctuations affecting the impermeability of the concrete. The liquid level sensor prevents water pressure loading from being interrupted due to water shortage in the tank, ensuring the continuous conduct of the test. The constant temperature control function eliminates the influence of water temperature on the pore structure of the concrete, ensuring that different batches of tests are conducted under the same temperature conditions, thus improving the comparability of the test results.

[0024] Reference Figure 1-4 The outlet pipe of the multi-stage water pressure loading component 2 is made of stainless steel and the outside of the pipe is wrapped with heat insulation cotton. A filter is installed between the electromagnetic regulating valve 7 and the pressure sensor. The combination of stainless steel pipe and heat insulation cotton ensures that the pipe can withstand high pressure and avoids water temperature fluctuations due to changes in ambient temperature. The filter prevents impurities in the water from clogging the electromagnetic regulating valve 7, extends the valve's service life, and ensures smooth and accurate water pressure regulation.

[0025] The implementation principle of the multi-stage water pressure gradient loading device for concrete impermeability testing according to this application is as follows: Before the test, the standard concrete specimen 6 is placed on the base 10 of the concrete specimen fixing assembly 3, the sealing gasket 13 is put on, the upper pressure cover 11 is put on and tightened with the clamping bolts 12 to ensure the specimen is sealed and fixed; clean water is injected into the test water tank 1 to the preset position of the liquid level sensor, and multiple water pressure parameters are set through the industrial touch screen 17 of the control box 5. The control box 5 starts the electric heating tube and the specimen preheating assembly. After the water temperature in the water tank and the specimen temperature both reach the set value, the test preparation is completed.

[0026] The control box 5 starts the multi-stage water pressure loading component 2. First, the electromagnetic regulating valve 7 of the first-stage water pressure regulating unit 9 is opened. Water in the test water tank 1 flows into the buffer chamber through the pipeline. The pressure sensor monitors the water pressure in real time and feeds it back to the PLC controller. When the water pressure reaches a certain level, the PLC controller adjusts the opening of the electromagnetic regulating valve 7 to maintain the pressure. During the pressure holding period, the weight sensor of the seepage volume acquisition component 4 collects the weight of the seepage in the measuring cylinder 16 in real time. The data is converted into seepage volume and transmitted to the control box 5 for storage. After the first stage of pressure holding is completed, the PLC controller automatically opens the electromagnetic regulating valve 7 of the second-stage water pressure regulating unit 9. The pressure fluctuation between stages in the buffer chamber is stabilized, and the pressure holding and seepage volume acquisition process is repeated. The subsequent water pressure loading for each stage is carried out in this manner until all preset gradient loading is completed.

[0027] Under water pressure, water permeates through the internal pores of the concrete specimen 6, flows into the collection funnel 15 through the permeable holes 14 of the fixing component, and then into the measuring cylinder 16. A weight sensor measures the weight of the water permeating into the measuring cylinder in real time, converts the density of the water into the permeation volume, and displays it on the industrial touchscreen 17 in real time. The control box 5 records the permeation volume change curve under each water pressure level. When the permeation volume suddenly increases under a certain water pressure level, the concrete specimen 6 is deemed to have failed to resist permeability, and the control box 5 automatically stops subsequent water pressure loading and issues an alarm. After the test, the data storage unit automatically saves all test data, and the operator can export the data via USB for calculating the permeability grade of the concrete.

[0028] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-stage water pressure gradient loading device for concrete permeability testing, comprising a test water tank (1), a multi-stage water pressure loading assembly (2), a concrete specimen fixing assembly (3), a seepage acquisition assembly (4), and a control box (5), characterized in that: The test water tank (1) is a sealed stainless steel box. The multi-stage water pressure loading component (2) is installed between the outlet of the test water tank (1) and the concrete specimen fixing component (3). The concrete specimen fixing component (3) is used to clamp and fix the concrete specimen (6). The seepage volume acquisition component (4) is located below the concrete specimen fixing component (3). The control box (5) is electrically connected to the multi-stage water pressure loading component (2) and the seepage volume acquisition component (4) respectively.

2. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 1, characterized in that: The multi-stage water pressure loading assembly (2) includes multiple water pressure regulating units (9) connected in series, and each water pressure regulating unit (9) includes an electromagnetic regulating valve (7), a pressure sensor and a one-way valve (8).

3. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 1, characterized in that: The concrete specimen fixing assembly (3) includes a base (10), an upper pressure cap (11), clamping bolts (12) and a sealing gasket (13). The base (10) has a water-permeable hole (14) in the center. The water-permeable hole (14) is connected to the water outlet pipe of the multi-segment water pressure loading assembly (2). The upper pressure cap (11) is connected to the base (10) by multiple clamping bolts (12). The sealing gasket (13) is made of nitrile rubber, and the inner diameter of the sealing gasket (13) is the same as the diameter of the water-permeable hole (14).

4. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 1, characterized in that: The seepage acquisition component (4) includes a water collection funnel (15), a measuring cylinder (16) and a weight sensor. The large end of the water collection funnel (15) is directly below the water-permeable hole (14) of the concrete specimen fixing component (3), and the small end extends into the measuring cylinder (16). The measuring cylinder (16) is made of transparent glass. The weight sensor is electrically connected to the control box (5).

5. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 1, characterized in that: The control box (5) includes an industrial touch screen (17), a PLC controller and a data storage unit. The industrial touch screen (17) can set the loading value and holding time of each water pressure segment.

6. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 1, characterized in that: The test water tank (1) is equipped with a liquid level sensor and an electric heating tube.

7. The multi-stage water pressure gradient loading device for concrete impermeability testing as described in claim 2, characterized in that: The outlet pipe of the multi-stage water pressure loading component (2) is made of stainless steel and the outside of the pipe is wrapped with insulation cotton. A filter is provided between the electromagnetic regulating valve (7) and the pressure sensor.

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