CN210269536U - Concrete water permeability coefficient tester - Google Patents
Concrete water permeability coefficient tester Download PDFInfo
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- CN210269536U CN210269536U CN201920163949.1U CN201920163949U CN210269536U CN 210269536 U CN210269536 U CN 210269536U CN 201920163949 U CN201920163949 U CN 201920163949U CN 210269536 U CN210269536 U CN 210269536U
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- concrete
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Abstract
The utility model discloses a concrete coefficient of permeability apparatus, including supplying drainage system, pressure regulating water tank, test piece sealing connection device, header tank, measurement system and data processing system, the numerical flow meter among the measurement system can gather the water permeability data of test piece, and data processing system can be according to the automatic coefficient of permeability who seeks the test piece of predetermined calculation method. Use the utility model discloses a concrete water permeability coefficient apparatus does not receive the restriction of water collection system volume, and accurate control flood peak pressure reduces the flood peak liquid level and fluctuates to guarantee the accuracy of survey result.
Description
Technical Field
The utility model belongs to a coefficient of water permeability apparatus, especially a concrete coefficient of water permeability apparatus that adopts digital flowmeter can carry out automated determination for a long time.
Background
The pervious concrete plays an important role in building a sponge city, improving water environment, reducing heat island effect and the like, and the water permeability coefficient is a key index for evaluating the performance of the pervious concrete. Some research results have been obtained for how to accurately and conveniently measure the water permeability coefficient, some of the research results have incorporated relevant standard specifications, such as 'water permeable pavement bricks and water permeable pavement slabs' GB/T25993-. In the aspect of measuring the water permeability, the prior art mainly adopts a mode of measuring the weight or the volume of water in a water collecting cylinder in a certain short time, and the test time is short and the result error is large due to the limitation of the volume of the water collecting cylinder; in the aspect of water head control, the prior art mainly adopts a mode of arranging overflow pipes or measuring pipes with scales at different heights, and the water head pressure of a test piece cannot be flexibly adjusted because the positions of the test piece and a pressure regulating water tank are relatively fixed; in the aspect of water quantity regulation, the prior art has higher control requirement on a water inlet pipeline because of limited overflow caliber, and is difficult to control liquid level fluctuation.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a concrete water permeability coefficient apparatus, overcome the not enough of prior art, increase test cycle, nimble regulation flood peak, the stable control water yield.
The utility model discloses a concrete coefficient of permeability apparatus is including supplying drainage system, pressure regulating water tank, test piece sealing connection device, header tank, measurement system and data processing system. The pressure regulating water tank is located the top of the concrete test piece that permeates water, and measurement system is including permeating water pipe and digital flowmeter, and the header tank is established and is linked to each other with the pipe of permeating water in the below of the concrete test piece that permeates water and its bottom. The digital flowmeter is arranged at the horizontal section of the water permeable pipe, can select a turbine flowmeter, a vortex flowmeter or an ultrasonic flowmeter and the like, is provided with a digital communication module, and can measure information such as instantaneous flow velocity, instantaneous flow, accumulated flow and the like. The data processing system can analyze and calculate the flow data collected by the digital flowmeter according to preset conditions.
Preferably, the measurement system further comprises a pressure measurement module. The water pressure at the upper part of the test piece is directly related to the water permeability, so that the accurate measurement of the water pressure is the basis for ensuring the accurate result. The method of controlling the height of the water head by only depending on the overflow plate cannot effectively monitor the fluctuation condition of the water level (particularly under the condition of longer test period). The pressure measurement module can monitor the real pressure of the upper part of the test piece in real time, and effectively identify the fluctuation condition of the pressure in the whole test period. The pressure measurement module can adopt an MS5534C pressure sensor, the MS5534C pressure sensor has low power consumption, the built-in temperature measurement and zero peeling functions are realized, the resolution ratio reaches 0.01kPa, a small SMD ceramic structure is adopted, the anti-corrosion sealing glue protection is realized, and the installation is convenient. The pressure measurement module can transmit the acquired water pressure or temperature data to the data processing system for calculating the water permeability coefficient of the test piece.
Preferably, the pressure regulating water tank is internally provided with an overflow plate, the overflow plate divides the pressure regulating water tank into a static pressure cavity and an overflow cavity, the static pressure cavity is provided with a water inlet, and the overflow cavity is provided with an overflow port. The fluctuation condition of the liquid level in the pressure regulating water tank is influenced by the size of the overflow caliber, and compared with an overflow pipe or an overflow groove, the overflow caliber can be enlarged to the maximum extent by adopting an overflow plate mode, the fluctuation of the liquid level is reduced, and the stability of the water pressure is ensured.
Preferably, the test piece sealing connection device adopts a cylindrical elastic sealing sleeve with an upper opening and a lower opening to carry out sealing connection on the test piece and the pressure regulating water tank. The elastic sealing sleeve can be made of synthetic rubber or polyurethane and other high polymer materials, and has good tensile and tear resistance, good sealing performance, wear resistance and corrosion resistance. Compared with a rigid sealing sleeve, the elastic sealing sleeve is not limited by the cross section shape of the test piece or the pressure regulating water tank, can flexibly adjust the relative position of the test piece and the pressure regulating water tank, and has good sealing effect and low use cost.
Preferably, the test piece sealing connection device adopts a cylindrical rigid sealing sleeve with an upper opening and a lower opening to carry out sealing connection on the test piece and the pressure regulating water tank. The rigid sealing sleeve can be made of engineering plastics, artificial composite boards, light alloys and other materials, has good mechanical properties, is easy to process, is waterproof and is corrosion-resistant. Compared with an elastic sealing sleeve, the rigid sealing sleeve has high strength, quick disassembly and assembly and long service life.
Compared with the prior art, the concrete water permeability coefficient tester of the utility model can not be limited by the volume of the water collecting cylinder in the aspect of measuring the water permeability, thereby increasing the testing period and reducing the error of the result; in the aspect of water head control, the relative position of the test piece and the pressure regulating water tank can be flexibly adjusted, and the water head pressure can be accurately controlled; in the aspect of water quantity regulation, the overflow caliber is greatly enlarged, the liquid level fluctuation is reduced, and the control requirement on a water inlet pipeline is lowered.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a perspective schematic view of a pressure regulating water tank of the concrete water permeability coefficient measuring apparatus of the present invention;
FIG. 2 is a side view of a pressure regulating water tank of the concrete water permeability coefficient measuring instrument of the present invention;
FIG. 3 is a schematic diagram of a water collection tank and a flow measurement system of the concrete water permeability coefficient measuring apparatus of the present invention;
FIG. 4 is a schematic view of the installation of the pressure sensor of the concrete water permeability coefficient measuring instrument of the present invention;
FIG. 5 is a schematic view of a first integrally assembled embodiment of the concrete water permeability tester of the present invention;
FIG. 6 is a schematic view of a second integrally assembled embodiment of the concrete water permeability measuring apparatus of the present invention;
FIG. 7 is a schematic view of a cross brace of the concrete water permeability tester of the present invention;
FIG. 8 is a schematic view of a third integrally assembled embodiment of the concrete water permeability measuring apparatus of the present invention;
FIG. 9 is a schematic view of a circular specimen jacket of the concrete permeability coefficient measuring apparatus of the present invention;
FIG. 10 is a schematic top view of a circular specimen jacket of the concrete permeability coefficient measuring apparatus according to the present invention;
FIG. 11 is a schematic view of a fourth integrally assembled embodiment of the concrete water permeability measuring apparatus of the present invention;
FIG. 12 is a schematic top view of a square test piece jacket of the concrete permeability coefficient measuring apparatus of the present invention;
wherein: 1. a test piece; 2. the device comprises a pressure regulating water tank, 21, overflow plates, 22, overflow cavities, 23, overflow ports, 24, a static pressure tank, 25, a water inlet, 26 and a mounting plate; 3. the device comprises a sealing connection device 31, an elastic sealing sleeve 32, an elastic hoop 33, a cross brace 34, a support element 341, a support net 342, a support frame 35, a clamp 351, an upper clamp 352, a lower clamp 353, a G-shaped clamp 36, a pull rod 37, a positioning screw rod 38, a test piece clamping sleeve 39 and an adapter cylinder; 4. a water collection tank; 5. a measuring system, 51 a water permeable pipe, 52, a digital flowmeter, 53, a flow line, 54, a pressure sensor, 55 and a pressure line; 6. a water supply and drainage system 61, a water inlet pipe 62, an overflow pipe 63, a water discharge pipe 64, a water storage tank 65 and a pressure regulating valve; 7. a frame body, 71 a water tank platform, 72 and a supporting platform; 8. a host.
Detailed Description
The concrete water permeability coefficient measuring apparatus of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, so as to understand the structure composition, the assembling method and the using manner of the present invention more clearly, but the protection scope of the present invention should not be limited thereby.
The utility model discloses concrete water permeability coefficient apparatus's pressure regulating water tank is shown as figure 1 and figure 2. The pressure regulating water tank 2 is in a square cylinder shape, the interior of the pressure regulating water tank is divided into an overflow cavity 22 and a static pressure cavity 24 by an L-shaped overflow plate 21, and the overflow cavity 22 and the static pressure cavity 24 are communicated at the upper part of the overflow plate 21. The outer wall of the overflow cavity 22 is provided with an overflow port 23, and the outer wall of the static pressure cavity 24 is provided with a water inlet 25. To ensure effective drainage, the aperture of the overflow port 23 is larger than the aperture of the water inlet 25.
The utility model discloses water tank and flow measurement system of concrete water permeability coefficient apparatus are shown in figure 3. The upper opening of the water collecting tank 4 is larger than the section size of the test piece 1, and the bottom of the water collecting tank is an inclined plane and is connected with the permeable pipe 51. The horizontal section of the water permeable pipe 51 is provided with a digital flowmeter 52, and the digital flowmeter 52 can collect the flow data of the water permeable pipe 51 and output the data to the host 8 through a flow line 53. The water in the permeable pipe 51 is drained to a water storage tank 64 through a drain pipe 63.
The utility model discloses concrete water permeability coefficient apparatus's pressure sensor's installation is shown in figure 4. The pressure sensor 54 is fixed on the cross brace 33, and the pressure measuring module thereof can adopt an MS5534C chip, can acquire water pressure data of the upper part of the test piece 1 in real time and output the data to the host computer 8 through a pressure line 55.
The utility model discloses a concrete water permeability coefficient apparatus first whole assembly embodiment is shown in figure 5. The cross sections of the test piece 1 and the pressure regulating water tank 2 are circular, the lower part of the elastic sealing sleeve 31 is tightly sleeved on the side surface of the test piece 1, 2 metal elastic hoop rings 32 are arranged on the periphery of the elastic sealing sleeve 31 for enhancing the sealing effect, and the upper part of the elastic sealing sleeve 31 and the lower end of the pressure regulating water tank 2 are bonded and sealed by sealant. The pressure-regulating water tank 2 is fixed to a tank platform 71 of the frame 7 by a mounting plate 26 on an outer wall thereof. The lower part of the test piece 1 is provided with a metal support 34, and the support 34 is connected with the mounting plate 26 on the pressure regulating water tank 2 through a pull rod 36. The pressure sensor 55 is adhered to the upper surface of the test piece 1, and the pressure line 55 penetrates out of the upper part of the pressure regulating water tank 2 and then is connected with the host machine 8. The flow line 53 of the digital flowmeter 52 is connected to the main unit 8 along the inner wall of the frame 7. The lower part of the frame body 7 is provided with a water storage tank 64, a water inlet pipe 61 and an overflow pipe 62 are respectively connected between the pressure regulating water tank 2 and the water storage tank 64, and a water pump is arranged in the water storage tank 64. The water flowing through the digital flow meter 52 is discharged to the water storage tank 64 through the water discharge pipe 63.
After the test piece 1 is connected in a sealing way, the distance between the upper surface of the test piece 1 and the upper edge of the overflow plate 21 in the pressure regulating water tank 2 is regulated through the pull rod 36, so that the test piece meets the preset requirement. And starting the host 8 and setting related test parameters. The water pump is started, the water in the water storage tank 64 enters the pressure-regulating water tank 2 through the water inlet pipe 61, and a part of the water flows back to the water storage tank 64 through the overflow pipe 62. The other part of the sample passes through the test piece 1 and is then drained to a water storage tank 64 through a water collection tank 4, a digital flowmeter 52 and a drain pipe 63. The flow rate of the water inlet pipe 61 is adjusted to a predetermined range. During the test, the digital flow meter 52 outputs the water permeation amount data collected in real time to the host 8, and the pressure sensor 54 outputs the water pressure data collected in real time to the host 8. And stopping the test when the test data (including instantaneous values, average values, extreme values, accumulated values, standard deviations and the like) of the water permeation quantity and the water pressure meet the preset conditions in the preset test period. The water pump is turned off and the water is drained to the storage tank 64.
The second integral assembly embodiment of the concrete water permeability coefficient tester is shown in fig. 6 and fig. 7. The cross-section of test piece 1 is square, and the cross-section of pressure regulating water tank 2 is circular. The lower part of the elastic sealing sleeve 31 is tightly sleeved on the side surface of the test piece 1, and 2 stainless steel elastic hoops 32 are arranged on the periphery of the elastic sealing sleeve 31 for enhancing the sealing effect. The upper part of the elastic sealing sleeve 31 is connected with the pressure regulating water tank 2 through a clamp 35. The upper clamp 351 and the lower clamp 352 are both annular, wherein the upper clamp 351 and the pressure regulating water tank 2 are integrated, the upper part of the elastic sealing sleeve 31 is arranged between the upper clamp and the lower clamp, and the upper clamp and the lower clamp are fastened and sealed through a G-shaped clamp 353. The lower part of the test piece 1 is provided with a square support member 34, the inside of the test piece is provided with a support net 341 made of stainless steel, the outer frame is a rigid support frame 342, and the support frame 342 is supported on the support platform 72 of the frame body 7 through a positioning screw 37. After the test piece 1 is sealed and connected with the lower end of the pressure regulating water tank 2, the distance between the upper surface of the test piece 1 and the upper edge of the overflow plate 21 in the pressure regulating water tank 2 can be adjusted through the positioning screw rod 37, so that the test piece meets the preset requirement. In order to avoid the water receiving area of the upper surface of the test piece 1 from being affected by the shrinkage deformation of the elastic sealing sleeve 31, a cross-shaped cross-brace 33 is arranged at the upper part of the test piece 1. The size of the cross brace 33 is matched with the test piece 1, 4 end parts are spherical, and the elastic sealing sleeve 31 can be transversely stretched on the upper part of the test piece 1, so that the effective water receiving area of the test piece 1 is ensured.
The third integral assembling mode of the concrete water permeability coefficient tester of the utility model is shown in fig. 8 to fig. 10. The rigid sealing sleeve adopts a two-petal type test piece jacket 38, the two petals are fastened and connected through bolts, and a flange plate is arranged on the upper edge of the test piece jacket 38. The specimen holder 38 is divided into a circular shape and a square shape, and may be lined with an elastic material. In this embodiment, the test piece 1 has a circular cross section, the pressure-regulating water tank 2 has a square cross section, the elastic sealing sleeve 31 is tightly fitted to the side surface of the test piece 1, and then the test piece is put into the unlined circular test piece jacket 38, and the test piece is connected to the lower end of the pressure-regulating water tank 2 by a flange via an adapter tube 39 (the upper opening is square and the lower opening is circular). The pressure sensor 55 is installed on the inner surface of the side wall of the pressure-regulating water tank 2. And after the test is started, stopping the test when the test data of the water permeability and the water pressure meet the preset conditions.
The fourth integral assembling mode of the concrete water permeability coefficient tester of the utility model is shown in figure 11 and figure 12. The rigid sealing sleeve adopts a two-petal type test piece jacket 38, the cross sections of the test piece 1 and the pressure regulating water tank 2 are both square, the test piece 1 is arranged in the square test piece jacket 38 with an elastic lining, a bolt is screwed, and then the test piece 1 is connected to the lower end of the pressure regulating water tank 2 in a flange mode. The pressure regulating water tank 2 is connected with the water storage tank 64 through the water inlet pipe 61 at the top, and an overflow plate and an overflow port are not arranged in the pressure regulating water tank. The water inlet pipe 61 is provided with a pressure regulating valve 65, the pressure sensor 55 is fixed in the pressure regulating water tank 2, and the pressure sensor 55 and the digital flowmeter 52 are connected with the host machine 8 in a wireless mode.
The water pump is started, water in the water storage tank 64 enters the pressure regulating water tank 2 through the pressure regulating valve 65, and then is discharged to the water storage tank 64 through the test piece 1, the water collecting tank 4, the digital flowmeter 52 and the water discharging pipe 63. During the test, the digital flow meter 52 outputs the water permeation amount data collected in real time to the host 8, and the pressure sensor 54 outputs the water pressure data collected in real time to the host 8. The pressure regulating valve 65 can regulate the water inflow of the water inlet pipe 61 in real time according to the water pressure data collected by the pressure sensor 55, and control the water pressure of the upper part of the test piece 1 to be within a preset range all the time. And stopping the test when the test data of the water permeability and the water pressure meet the preset conditions in the preset test period.
The utility model discloses among the various whole assembly embodiments of concrete water permeability coefficient apparatus, be equipped with data processing system in the host computer 8, when calculating the water permeability coefficient of test piece, use Darcy's law (formula 1) as theoretical basis. In the formula, k is a water permeability coefficient, Q is a water permeability within time t, L is a thickness of the test piece, A is a sectional area of the test piece, H is a water head pressure, and t is test time.
Applicable conditions of Darcy's Law include: homogeneous materials, one-dimensional flow, stable water head, stable flow and stable temperature, namely the Darcy's law can evaluate the water permeability coefficient of the water permeable material in a stable state (hereinafter referred to as a stable state). Therefore, how to judge that the test condition reaches the steady state is the key for accurate water permeability coefficient result. From the formula 1, on the premise that the thickness and the sectional area of the test piece are fixed, the accuracy of the water permeability coefficient test result mainly depends on the height of the water head and the test time. The existing technology is mainly to measure the total water permeation amount in a certain fixed time period or to take the average value of the water permeation amount at certain specific time intervals, and whether the steady state is reached is not judged. Particularly, when the test time is short, the liquid level fluctuation is large, and the water head height is small, the calculation result error of the water permeability coefficient is large. The data processing system can judge whether the flow, pressure or temperature data acquired in real time reaches a steady state. Factors to be considered in determining steady state may include: the fluctuation condition of instantaneous data (water permeability, pressure and temperature), the fluctuation condition of data in a set calculation time period and the fluctuation condition of water permeability coefficient calculation results in different calculation time periods (for example, in the case that the fluctuation limit value of the instantaneous data and the data in the period is met by taking 30min as 1 calculation time period, the water permeability coefficient calculation results in continuous 5 calculation time periods have a difference of not more than 2% and do not change towards one direction monotonically). And when the steady state condition is met, calculating and storing the water permeability coefficient result, and ending the test, otherwise, continuously testing until the steady state is reached.
In the embodiments of the concrete water permeability coefficient determinator and the test piece sealing connection device, the test time can be set at will, the liquid level fluctuation can be greatly reduced, the water head height can be adjusted manually when an elastic sealing sleeve or a pressure regulating valve is adopted, and the test parameters (such as the length of a calculation time period, the magnitude of a pressure fluctuation limit value and the height of the water head) can be adjusted in a targeted manner according to the water permeability of the test piece, so that the test conditions are optimized, and the accuracy and reliability of the result are further ensured.
For the test under the nonstandard temperature, the calculation result of the water permeability coefficient needs to be corrected according to the actual temperature due to the influence of the dynamic viscosity coefficient of water. The MS5534C pressure sensor is internally provided with a temperature measuring function, and the temperature of water can be synchronously output to a data processing system during testing, so that the calculation result of the water permeability coefficient can be conveniently corrected.
And in the test time t, the water permeability Q of the test piece can be calculated according to the flow velocity of the water permeable pipe and the section of the pipeline. The calculation process can be completed by a digital flowmeter or a data processing system. In addition, the digital flowmeter can also be provided with a temperature compensation function, and the temperature of the water permeation quantity Q measured at the non-standard temperature is directly corrected through the built-in correction quantity.
In addition to the above description of the embodiments and the usage, the concrete permeability coefficient measuring apparatus of the present invention has other similar structural forms, assembling methods and usage, and the object of the present invention can be accomplished equally. Modifications and substitutions which will be apparent to those skilled in the art are intended to be within the scope of the invention.
Claims (5)
1. The utility model provides a concrete coefficient of permeability apparatus, includes water supply and drainage system, pressure regulating water tank, test piece sealing connection device, header tank, measurement system and data processing system, its characterized in that: the pressure regulating water tank is located the top of the concrete test piece that permeates water, measurement system is including permeating water pipe and digital flowmeter, the header tank is established the below of the concrete test piece that permeates water and its bottom with it links to each other to permeate water the pipe, digital flowmeter establishes the horizontal segment of the pipe of permeating water, data processing system can be right according to the condition of predetermineeing the flow data that digital flowmeter gathered carry out the analytical computation.
2. The concrete water permeability coefficient tester according to claim 1, characterized in that: the measuring system also comprises a pressure measuring module, and the pressure measuring module can acquire water pressure data of the upper part of the test piece.
3. The concrete water permeability coefficient tester according to claim 1, characterized in that: the pressure regulating water tank is internally provided with an overflow plate, the overflow plate divides the pressure regulating water tank into a static pressure cavity and an overflow cavity, the static pressure cavity is provided with a water inlet, and the overflow cavity is provided with an overflow port.
4. The concrete water permeability coefficient tester according to claim 1, characterized in that: and the test piece sealing connection device adopts a cylindrical elastic sealing sleeve with an upper opening and a lower opening to carry out sealing connection on the test piece and the pressure regulating water tank.
5. The concrete water permeability coefficient tester according to claim 1, characterized in that: the test piece sealing connection device adopts a cylindrical rigid sealing sleeve with an upper opening and a lower opening to carry out sealing connection on the test piece and the pressure regulating water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920163949.1U CN210269536U (en) | 2019-01-30 | 2019-01-30 | Concrete water permeability coefficient tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920163949.1U CN210269536U (en) | 2019-01-30 | 2019-01-30 | Concrete water permeability coefficient tester |
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| CN210269536U true CN210269536U (en) | 2020-04-07 |
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| CN201920163949.1U Expired - Fee Related CN210269536U (en) | 2019-01-30 | 2019-01-30 | Concrete water permeability coefficient tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595642A (en) * | 2020-06-29 | 2021-04-02 | 北京仁创科技集团有限公司 | Water permeability detection device and detection method |
-
2019
- 2019-01-30 CN CN201920163949.1U patent/CN210269536U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595642A (en) * | 2020-06-29 | 2021-04-02 | 北京仁创科技集团有限公司 | Water permeability detection device and detection method |
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Granted publication date: 20200407 Termination date: 20220130 |