A concrete depth performance testing device

Abstract

The utility model discloses a kind of concrete depth performance testing device, including shell, top cover, combined type pressurizing mechanism, combined type supporting mechanism, water inlet pipe, camera, controller, high-pressure water supply device;Shell top detachably fixed connection has top cover, top cover is connected with combined type pressurizing mechanism, the inner wall of shell below combined type pressurizing mechanism is fixedly connected with baffle for placing test piece along level, baffle separates shell into upper chamber and lower chamber, lower chamber is equipped with the combined type supporting mechanism opposite up and down with combined type pressurizing mechanism in, upper chamber is equipped with the camera for observing test piece crack, lower chamber is equipped with water inlet pipe, water inlet pipe is connected with high-pressure water supply device.This device can carry out both compressive strength test, and can carry out permeability resistance test, effectively improve the applicability of device, widen the scope of application, provide convenience for the in-depth study of concrete performance.

Description

Technical Field

[0001] This utility model relates to the field of concrete performance testing technology, specifically to a concrete depth performance testing device. Background Technology

[0002] The performance testing of concrete mainly includes compressive strength testing and permeability testing. The basic principle of concrete compressive strength testing is to apply progressively increasing pressure to a standard-sized concrete cube specimen until the specimen is crushed or fails. The compressive strength is calculated by recording the load at failure. Compressive strength is expressed as the maximum pressure that a unit area can withstand, usually measured in MPa (megapascals).

[0003] Permeability testing helps classify the impermeability grade of concrete, thus allowing concrete materials to be used in different construction applications. Current standards for classifying concrete impermeability grades are based on the maximum water pressure it can withstand during impermeability testing. According to the "Concrete Quality Control Standard" GB50164, concrete impermeability grades are divided into six levels: P4, P6, P8, P10, P12, and greater than P12. These levels correspond to the concrete's ability to resist water pressures of 0.4, 0.6, 0.8, 1.0, 1.2 MPa, and higher, respectively, without leakage.

[0004] Utility model patent application number CN202510057088.9 discloses a device and method for detecting the impermeability of recycled concrete for building safety monitoring. The device includes a housing, with a data acquisition module fixedly connected to the upper end of the housing and a signal processing module fixedly connected to the inner wall of the housing. By placing the detection head in the data acquisition module at different depths and positions inside the recycled concrete, the signal processing module processes the acquired data, which is then transmitted to a data analysis module to calculate the concrete's impermeability performance index. Finally, the display module presents the test results to the user, thus achieving real-time monitoring of the impermeability performance of recycled concrete.

[0005] However, the above-mentioned compressive strength test and impermeability test are conducted separately using different devices. There is currently a lack of devices that can simultaneously perform compressive strength test and impermeability test. Furthermore, since the impermeability of concrete is related to the pressure load it bears, there is currently a lack of experimental devices in the technology to study the changes in the impermeability of concrete under different loads. Utility Model Content

[0006] This utility model discloses a concrete depth performance testing device. On the one hand, the device can simultaneously test the compressive strength and impermeability of concrete specimens. On the other hand, it can conduct experimental research on the changes in impermeability of concrete specimens after being subjected to different loads, which helps to provide more detailed data support for engineering sites.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A concrete depth performance testing device includes a shell, a top cover, a combined pressurization mechanism, a combined support mechanism, a water inlet pipe, a camera, a controller, and a high-pressure water supply device.

[0009] The top of the shell is detachably and fixedly connected to a top cover, which is connected to a combined pressurizing mechanism. The inner wall of the shell below the combined pressurizing mechanism is horizontally fixedly connected to a partition for placing the test specimen. The partition divides the shell into an upper chamber and a lower chamber. The lower chamber is equipped with a combined support mechanism that is vertically opposite to the combined pressurizing mechanism. The upper chamber is equipped with a camera for observing cracks in the test specimen. The lower chamber is equipped with a water inlet pipe that is connected to a high-pressure water supply device.

[0010] When the combined pressurizing mechanism and the combined support mechanism are abutting against the top and bottom of the specimen respectively, they constitute a device for testing the compressive strength of the specimen; when the combined pressurizing mechanism and the combined support mechanism are detached from the top and bottom of the specimen respectively, they constitute a device for testing the impermeability of the specimen.

[0011] Preferably, the controller is electrically connected to the power supply, the combined pressurization mechanism, the combined support mechanism, the camera, and the high-pressure water supply device via wires.

[0012] The edge of the partition is sealed and fixedly connected to the inner wall of the shell, and the top of the shell is open;

[0013] The edge of the top cover extends out of the outer side of the shell and is fixedly connected to the pre-set connecting plate on the top of the outer wall of the shell by tie bolts, forming a sealing structure between the top cover and the shell. The partition has a circular hole at the center and an annular rubber pad at the edge of the upper port of the circular hole. The test specimen is a cylindrical structure with an anti-permeability coating on the side surface of the cylindrical structure. The cylindrical structure is coaxial with the circular hole and its bottom edge is pressed against the annular rubber pad.

[0014] An annular limiting frame is coaxially provided at the upper end of the partition plate on the outer side of the annular rubber pad, and the outer wall of the annular limiting frame is fixedly connected to the top of the partition plate by a support rod.

[0015] Preferably, the combined pressurizing mechanism includes a first electric cylinder, a second electric cylinder, an annular pressure plate, a circular plate one, and a circular plate two. The first electric cylinder is arranged vertically, and the cylinder barrel of the first electric cylinder is fixedly connected to the lower end of the top cover. The piston rod extends downward and is connected to the circular plate two through a pressure sensor. The lower edge of the circular plate two is connected to the annular pressure plate through a support column.

[0016] The bottom end of the annular pressure plate is provided with an annular rubber pad II. The top edge of the specimen abuts against the annular rubber pad II. A second electric cylinder is installed at the lower end of the circular plate II. The cylinder of the second electric cylinder is fixedly connected to the lower end of the circular plate II. The telescopic end extends downward and is fixedly connected to a circular plate I. The bottom outer edge of the circular plate I is provided with a first annular groove, and the top inner edge of the annular pressure plate is provided with a second annular groove.

[0017] The circular plate and the inner hole of the annular pressure plate are engaged through the first annular groove and the second annular groove. A circular rubber pad of the same thickness as the annular rubber pad is connected to the lower end of the circular plate.

[0018] Preferably, the camera includes a first camera and a second camera. The first camera for observing cracks at the top of the test piece is fixedly connected to the side wall of the support column, and the second camera for observing cracks on the outer wall of the test piece is provided on the inner wall of the upper cavity.

[0019] Preferably, the combined support mechanism includes a third electric cylinder and a protective shell located at the bottom of the lower chamber. The third electric cylinder is arranged vertically, with its fixed end fixedly connected to the bottom of the lower chamber and its telescopic end extending upward and fixedly connected to a circular plate.

[0020] The size of the circular plate three matches the circular hole, and the top of the circular plate three is provided with a circular rubber pad two with the same thickness as the annular rubber pad. The protective shell is sealed and fixedly connected to the bottom of the lower chamber. The top of the protective shell is open, and the cylinder of the third electric cylinder is housed inside the protective shell.

[0021] The lower surface of the circular plate three is provided with a third annular groove, and an annular rubber pad three is provided on the third annular groove. The edge of the inner hole at the top of the protective shell is provided with a fourth annular groove that cooperates with the third annular groove. When the third electric cylinder retracts, the circular plate three is sealed and fixedly connected through the third annular groove, the annular rubber pad three, and the fourth annular groove, and the shell forms a sealed and waterproof structure.

[0022] Preferably, a workbench is fixedly connected to the bottom of the housing, the water inlet pipe is located at the bottom of the housing and passes through the workbench, and a drain pipe is also provided on one side of the bottom of the housing.

[0023] The water inlet pipe and the water outlet pipe are respectively equipped with a first solenoid valve and a second solenoid valve. The first solenoid valve and the second solenoid valve are electrically connected to the controller through wires. The controller is fixedly installed on the outer wall of the housing.

[0024] Preferably, the lower chamber is equipped with a water pressure sensor on its inner wall, a ventilation pipe is provided on one side of the lower chamber, the ventilation pipe is equipped with a third solenoid valve, a fan is provided at the outer end of the ventilation pipe, and an air outlet pipe is provided on the lower chamber side wall opposite to the ventilation pipe.

[0025] The air outlet pipe is equipped with a fourth solenoid valve, and the outer wall of the lower chamber is also equipped with several nozzles, each nozzle's connecting pipe being equipped with a fifth solenoid valve.

[0026] Preferably, the water inlet pipe is fixedly connected to a transition chamber at the open end of the lower chamber. Multiple dye boxes containing different colored dyes are arranged at the top of the transition chamber. The dye boxes are connected to the transition chamber through water inlet holes. Water outlet holes are provided on the side walls of the dye boxes. The water inlet holes and water outlet holes are respectively equipped with a sixth solenoid valve and a seventh solenoid valve.

[0027] Preferably, the inner walls of the upper chamber and the lower chamber are respectively equipped with temperature and humidity sensors, and the temperature and humidity sensors are electrically connected to the controller via wires.

[0028] The beneficial effects of this new concrete depth performance testing device:

[0029] Although the specimen may not show obvious cracks on its surface after being subjected to load, its internal structure may have undergone microscopic changes, such as an increase in microcracks and enhanced permeability. Therefore, this invention, through the above design, enables the observation and study of changes in the permeability of specimens after loading, providing data reference for practical engineering. Furthermore, this invention's device can perform both compressive strength and permeability tests, effectively improving its applicability and broadening its scope of application, thus facilitating in-depth research on concrete performance. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments are briefly described below, which constitute a part of the specification and are used together with the embodiments of this utility model to explain this utility model, but do not constitute a limitation on this utility model.

[0031] Figure 1 This is a cross-sectional structural diagram of the present invention during the compressive strength test.

[0032] Figure 2 This is a cross-sectional structural diagram of the present invention during the permeability test.

[0033] Figure 3This is a magnified schematic diagram of a partial structure at point A of this utility model.

[0034] Figure 4 This is a magnified schematic diagram of a partial structure at point B of this utility model.

[0035] Figure 5 This is a magnified schematic diagram of a partial structure at point C of this utility model.

[0036] Figure 6 This is a structural diagram of the combination of the circular plate and the annular pressure plate of this utility model.

[0037] 1. Workbench; 2. Controller; 3. Housing; 4. Top cover; 5. Tie bolts; 6. Connecting plate; 7. First electric cylinder; 8. Pressure sensor; 9. Circular plate two; 10. Support column; 11. Temperature and humidity sensor; 12. Second electric cylinder; 121. Circular plate one; 1211. Bottom of the first annular groove; 122. Circular rubber pad one; 13. Protective shell; 14. Third electric cylinder; 141. Circular plate three; 142. Circular rubber pad three; 143. Circular rubber pad two; 144. Circular rubber pad... 15. Rubber pad 1; 26. Water inlet pipe; 27. Drain pipe; 28. Ventilation pipe; 29. ​​Fan; 20. Air outlet pipe; 21. Nozzle; 22. Ventilation pipe; 23. Humidity regulating pipe (used to expel moisture or humidify); 24. Specimen; 231. Anti-permeability coating; 25. Annular pressure plate; 26. Annular rubber pad 2; 272. Second annular slot; 28. Support rod; 29. ​​Annular limiting frame; 20. Transition chamber; 20. Dye box; 21. Sixth solenoid valve; 22. Water outlet; 23. First camera. Detailed Implementation

[0038] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger scope of the present invention through a combination of multiple embodiments.

[0040] Example 1

[0041] In the initial embodiment, the present invention provides a concrete depth performance testing device, such as... Figure 1-6As shown, it includes a housing 3, a top cover 4, a combined pressurizing mechanism, a combined support mechanism, a water inlet pipe, a camera, a controller, and a high-pressure water supply device. The top cover 4 is detachably and fixedly connected to the top of the housing 3. The top cover 4 is connected to the combined pressurizing mechanism. A partition (not marked in the figure) for placing the test specimen 23 is fixedly connected horizontally to the inner wall of the housing 3 below the combined pressurizing mechanism.

[0042] The partition divides the shell 3 into an upper chamber and a lower chamber. The lower chamber is equipped with a combined support mechanism that is vertically opposite to the combined pressurizing mechanism. The upper chamber is equipped with a camera for observing cracks in the specimen 23. The lower chamber is equipped with a water inlet pipe 15, which is connected to a high-pressure water supply device (not shown in the figure). When the combined pressurizing mechanism and the combined support mechanism are abutting against the top and bottom of the specimen 23, respectively, they constitute a device for testing the compressive strength of the specimen 23. When the combined pressurizing mechanism and the combined support mechanism are partially detached from the top and bottom of the specimen 23, respectively, they constitute a device for testing the impermeability of the specimen 23. The controller is electrically connected to the power supply, the combined pressurizing mechanism, the combined support mechanism, the camera, and the high-pressure water supply device through wires.

[0043] Example 2

[0044] In a further embodiment, such as Figure 1-6 As shown, the edge of the partition is sealed and fixedly connected to the inner wall of the shell 3. The top of the shell 3 is open. The edge of the top cover 4 extends out of the outer side of the shell and is fixedly connected to the pre-set connecting plate 6 on the top of the outer wall of the shell by tie bolts 5, forming a sealed structure between the top cover 4 and the shell 3. The partition has a circular hole at its center. The edge of the upper port of the circular hole is provided with an annular rubber pad 144. The test specimen 23 is a cylindrical structure. The side surface of the cylindrical structure is coated with an anti-permeability coating 231. The cylindrical structure is coaxial with the circular hole and its bottom edge is pressed against the annular rubber pad 144. The upper part of the partition where the annular rubber pad 144 is located is coaxially provided with an annular limiting frame 251 to limit the specimen. The outer wall of the annular limiting frame 251 is fixedly connected to the top of the partition by a support rod 25.

[0045] Example 3

[0046] In a further embodiment, such as Figure 1-6As shown, the combined pressurizing mechanism includes a first electric cylinder 7, a second electric cylinder 12, an annular pressure plate 24, a first circular plate 121, and a second circular plate 9. The first electric cylinder 7 is arranged vertically, and its cylinder barrel is fixedly connected to the lower end of the top cover 4. The piston rod extends downward and is connected to the second circular plate 9 through a pressure sensor 8. The lower edge of the second circular plate 9 is connected to the annular pressure plate 24 through a support column 10. The bottom end of the annular pressure plate 24 is provided with an annular rubber pad 241. The top edge of the specimen 23 abuts against the annular rubber pad 241 (to prevent water from seeping through the gap between the anti-permeability coating and the specimen). The second electric cylinder 12 is installed at the lower end of the second circular plate 9. The cylinder barrel of the second electric cylinder 12 is fixedly connected to the lower end of the second circular plate 9, and its telescopic end extends downward and is fixedly connected to the first circular plate 121. The outer edge of the bottom end of the first circular plate 121 is provided with a first annular groove (see...). Figure 3 The bottom of the first annular groove 1211 and the inner edge of the top of the annular pressure plate 24 are provided with a second annular groove 242. The circular plate 121 and the inner hole of the annular pressure plate 24 are engaged through the first annular groove and the second annular groove 242. The lower end of the circular plate 121 is connected to a circular rubber pad 122 with the same thickness as the annular rubber pad 241. After the circular plate 1 and the annular pressure plate are engaged, they form an integral structure. Pressure is applied to the top of the specimen by the first electric cylinder.

[0047] Example 4

[0048] In a further embodiment, such as Figure 1-6 As shown, the camera includes a first camera 28 and a second camera (not marked in the figure). The first camera 28 for observing the crack at the top of the test piece 23 is fixedly connected to the side wall of the support column 10, and the second camera for observing the crack on the outer wall of the test piece 23 is provided on the inner wall of the upper cavity.

[0049] In a further embodiment, such as Figure 1-6As shown, the combined support mechanism includes a third electric cylinder 14 and a protective shell 13 located at the bottom of the lower chamber. The third electric cylinder 14 is arranged vertically, with its fixed end fixedly connected to the bottom of the lower chamber, and its telescopic end extending upward and fixedly connected to a circular plate 141. The size of the circular plate 141 matches the circular hole, and the top of the circular plate 141 is provided with a circular rubber pad 143 with the same thickness as the annular rubber pad. The protective shell 13 is sealed and fixedly connected to the bottom of the lower chamber, and the top of the protective shell 13 is open. The cylinder of the third electric cylinder 14 is housed within the protective shell 13. The edge of the lower surface of the circular plate 141 is provided with a third annular groove, and an annular rubber pad 142 is provided on the third annular groove. The edge of the inner hole at the top of the protective shell 13 is provided with a fourth annular groove (not marked in the figure) that mates with the third annular groove. When the third electric cylinder 14 retracts, the circular plate 141 is sealed and fixedly connected through the third annular groove, the annular rubber pad 142, and the fourth annular groove, thus forming a sealed and waterproof structure for the shell. In this embodiment, the first to fourth annular slots can be L-shaped slots, similar to an opening structure that works together.

[0050] Example 5

[0051] In a further embodiment, such as Figure 1-6 As shown, a workbench 1 is fixedly connected to the bottom of the housing 3. The water inlet pipe 15 is located at the bottom of the housing 3 and passes through the workbench 1. A drain pipe 16 is also provided on one side of the bottom of the housing. The water inlet pipe 15 and the drain pipe 16 are respectively equipped with a first solenoid valve and a second solenoid valve. The first solenoid valve and the second solenoid valve are electrically connected to the controller through wires. The controller 2 is fixedly located on the outer wall of the housing 3.

[0052] In a further embodiment, such as Figure 1-6 As shown, a water pressure sensor (not marked in the figure) is provided on the inner wall of the lower chamber. A ventilation pipe 17 is provided on one side of the inner wall of the lower chamber. The ventilation pipe 17 is equipped with a third solenoid valve. A fan 18 (preferably a hot air fan) is provided at the outer end of the ventilation pipe 17. An air outlet pipe 19 is provided on the side wall of the lower chamber opposite to the ventilation pipe 17. The air outlet pipe 19 is equipped with a fourth solenoid valve. Several nozzles 20 are also provided on the outer wall of the lower chamber. A fifth solenoid valve is provided on the connecting pipe of each nozzle 20.

[0053] Example 6

[0054] In a further embodiment, such as Figure 1-6As shown, the inlet pipe 15 is fixedly connected to a transition chamber 26 (containing pressurized water) at its open end in the lower chamber. Multiple dye boxes 27 containing different colored dyes are arranged at the top of the transition chamber 26. The dye boxes 27 are connected to the transition chamber 26 through inlet holes. Outlet holes 272 are provided on the side walls of the dye boxes 27. The inlet holes and outlet holes 272 are respectively equipped with a sixth solenoid valve 271 and a seventh solenoid valve. During the permeability test of the specimen, considering the height of the specimen, incomplete permeation may occur. That is, under a certain pressure, within a certain time, only a portion of the specimen permeates, not completely reaching the top. Normally, this phenomenon is considered as no permeation. However, in this study of the permeability of the specimen under varying loads, partial permeation is also used as an indicator of permeability performance. By dyeing the water with different colors to mark the permeability indicators of the specimen under different pressure loads, the specimen is dissected after the test for direct observation and analysis.

[0055] In a further embodiment, such as Figure 1-6 As shown, the inner walls of the upper chamber and the lower chamber are respectively equipped with temperature and humidity sensors 11, and the temperature and humidity sensors 11 are electrically connected to the controller through wires.

[0056] Example 7

[0057] The operating principle of the concrete depth performance testing device is as follows:

[0058] The actual work is carried out using either the compressive strength test mode, the permeability test mode, or the permeability test mode of specimens after different pressure loads.

[0059] The compressive strength test mode refers to: placing the concrete specimen in the annular limiting frame so that its bottom end abuts against the first annular rubber pad; extending the second electric cylinder so that the first circular plate is tightly engaged with the annular pressure plate; extending the third electric cylinder so that the third circular plate enters the circular hole and fits with the gap in the circular hole; at this time, the first electric cylinder applies downward pressure to pressurize the top of the specimen, thereby testing the compressive strength of the specimen.

[0060] The aforementioned impermeability test mode refers to: the second electric cylinder shortens, causing the first circular plate to detach from the top of the specimen; the third electric cylinder shortens, causing the third circular plate to fit with the protective shell to form a sealed and waterproof structure; pressurized water is input through the water inlet pipe; and the first camera is used to observe whether there are water marks seeping through the top of the specimen, thus testing the impermeability of the specimen under different pressure conditions.

[0061] The aforementioned test modes for specimen permeability performance under different pressure loads refer to:

[0062] First, apply the set initial pressure to the specimen in the compressive strength test mode. After the set pressurization time, observe whether there are cracks on the top and side walls of the specimen. If there are, the specimen is unqualified. If not, test the permeability resistance under the permeability resistance test mode under certain time and pressure conditions. At this time, pressurized water enters the lower chamber through the transition chamber and then through the first dye box. If no water marks seep out from the surface of the specimen, stop the permeability resistance test.

[0063] After closing the inlet pipe and opening the drain pipe to drain the water from the lower chamber, open the nozzle to clean the dye-laden water in the lower chamber. After cleaning, close the outlet pipe and open the fan and air outlet pipe. Based on the data from the temperature and humidity sensor, the controller determines that the lower chamber is dry, then closes the fan, ventilation pipe, and air outlet pipe, and continues to conduct the next level of compressive strength test under higher pressure. This cycle is repeated until all compressive strength tests and corresponding impermeability tests under each pressure are completed. The controller records the experimental data and analyzes the changes in the impermeability of the concrete specimen after being subjected to different loads compared to the specimen being tested for impermeability alone (i.e., impermeability under no pressure load). Finally, clean the lower chamber, drain the water, dry it, close the device, remove the specimen, dissect it, and observe the different dyeing patterns inside to analyze the actual permeability of the specimen under different pressure conditions.

[0064] Although the specimen may not show obvious cracks on its surface after being subjected to load, its internal structure may have undergone microscopic changes, such as an increase in microcracks and enhanced permeability. Therefore, this invention, through the above design, enables the observation and study of changes in the permeability of specimens after loading, providing data reference for practical engineering. Furthermore, this invention's device can perform both compressive strength and permeability tests, effectively improving its applicability and broadening its scope of application, thus facilitating in-depth research on concrete performance.

Claims

1. A concrete depth performance testing device, characterized in that, Includes housing, top cover, combined pressurization mechanism, combined support mechanism, water inlet pipe, camera, controller, and high-pressure water supply device; The top of the shell is detachably and fixedly connected to a top cover, which is connected to a combined pressurizing mechanism. The inner wall of the shell below the combined pressurizing mechanism is horizontally fixedly connected to a partition for placing the test specimen. The partition divides the shell into an upper chamber and a lower chamber. The lower chamber is equipped with a combined support mechanism that is vertically opposite to the combined pressurizing mechanism. The upper chamber is equipped with a camera for observing cracks in the test specimen. The lower chamber is equipped with a water inlet pipe that is connected to a high-pressure water supply device. When the combined pressurizing mechanism and the combined support mechanism are abutting against the top and bottom of the specimen respectively, they constitute a device for testing the compressive strength of the specimen; when the combined pressurizing mechanism and the combined support mechanism are detached from the top and bottom of the specimen respectively, they constitute a device for testing the impermeability of the specimen. The combined pressurization mechanism includes a first electric cylinder, a second electric cylinder, an annular pressure plate, a circular plate one, and a circular plate two. The first electric cylinder is arranged vertically, and the cylinder barrel of the first electric cylinder is fixedly connected to the lower end of the top cover. The piston rod extends downward and is connected to the circular plate two through a pressure sensor. The lower edge of the circular plate two is connected to the annular pressure plate through a support column. The combined support mechanism includes a third electric cylinder and a protective shell located at the bottom of the lower chamber. The third electric cylinder is arranged vertically, with its fixed end fixedly connected to the bottom of the lower chamber and its telescopic end extending upward and fixedly connected to a circular plate.

2. The concrete depth performance testing device as described in claim 1, characterized in that, The controller is electrically connected to the power supply, the combined pressurization mechanism, the combined support mechanism, the camera, and the high-pressure water supply device via wires. The edge of the partition is sealed and fixedly connected to the inner wall of the shell, and the top of the shell is open; The edge of the top cover extends out of the outer side of the shell and is fixedly connected to the pre-set connecting plate on the top of the outer wall of the shell by tie bolts, forming a sealing structure between the top cover and the shell. The partition has a circular hole at the center and an annular rubber pad at the edge of the upper port of the circular hole. The test specimen is a cylindrical structure with an anti-permeability coating on the side surface of the cylindrical structure. The cylindrical structure is coaxial with the circular hole and its bottom edge is pressed against the annular rubber pad. An annular limiting frame is coaxially provided at the upper end of the partition plate on the outer side of the annular rubber pad, and the outer wall of the annular limiting frame is fixedly connected to the top of the partition plate by a support rod.

3. The concrete depth performance testing device as described in claim 2, characterized in that, The bottom end of the annular pressure plate is provided with an annular rubber pad II. The top edge of the specimen abuts against the annular rubber pad II. A second electric cylinder is installed at the lower end of the circular plate II. The cylinder of the second electric cylinder is fixedly connected to the lower end of the circular plate II. The telescopic end extends downward and is fixedly connected to a circular plate I. The bottom outer edge of the circular plate I is provided with a first annular groove, and the top inner edge of the annular pressure plate is provided with a second annular groove. The circular plate and the inner hole of the annular pressure plate are engaged through the first annular groove and the second annular groove. A circular rubber pad of the same thickness as the annular rubber pad is connected to the lower end of the circular plate.

4. The concrete depth performance testing device as described in claim 3, characterized in that, The camera includes a first camera and a second camera. The first camera, used to observe the crack at the top of the test piece, is fixedly connected to the side wall of the support column, and the second camera, used to observe the crack on the outer wall of the test piece, is provided on the inner wall of the upper cavity.

5. The concrete depth performance testing device as described in claim 4, characterized in that, The size of the circular plate three matches the circular hole, and the top of the circular plate three is provided with a circular rubber pad two with the same thickness as the annular rubber pad. The protective shell is sealed and fixedly connected to the bottom of the lower chamber. The top of the protective shell is open, and the cylinder of the third electric cylinder is housed inside the protective shell. The lower surface of the circular plate three is provided with a third annular groove, and an annular rubber pad three is provided on the third annular groove. The edge of the inner hole at the top of the protective shell is provided with a fourth annular groove that cooperates with the third annular groove. When the third electric cylinder retracts, the circular plate three is sealed and fixedly connected through the third annular groove, the annular rubber pad three, and the fourth annular groove, and the shell forms a sealed and waterproof structure.

6. The concrete depth performance testing device as described in claim 5, characterized in that, A workbench is fixedly connected to the bottom of the housing, the water inlet pipe is located at the bottom of the housing and passes through the workbench, and a drain pipe is also provided on one side of the bottom of the housing. The water inlet pipe and the water outlet pipe are respectively equipped with a first solenoid valve and a second solenoid valve. The first solenoid valve and the second solenoid valve are electrically connected to the controller through wires. The controller is fixedly installed on the outer wall of the housing.

7. The concrete depth performance testing device as described in claim 6, characterized in that, The lower chamber is equipped with a water pressure sensor on its inner wall, a ventilation pipe is provided on one side of the lower chamber, a third solenoid valve is provided on the ventilation pipe, a fan is provided at the outer end of the ventilation pipe, and an air outlet pipe is provided on the lower chamber side wall opposite to the ventilation pipe. The air outlet pipe is equipped with a fourth solenoid valve, and the outer wall of the lower chamber is also equipped with several nozzles, each nozzle's connecting pipe being equipped with a fifth solenoid valve.

8. The concrete depth performance testing device as described in claim 7, characterized in that, The water inlet pipe is fixedly connected to a transition chamber at its open end in the lower chamber. Multiple dye boxes containing different colored dyes are arranged at the top of the transition chamber. The dye boxes are connected to the transition chamber through water inlets. Water outlets are provided on the side walls of the dye boxes. The water inlet and water outlet are respectively equipped with a sixth solenoid valve and a seventh solenoid valve.

9. A concrete depth performance testing device as described in claim 8, characterized in that, Temperature and humidity sensors are respectively installed on the inner walls of the upper and lower chambers, and the temperature and humidity sensors are electrically connected to the controller via wires.

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