Concrete impermeability detection device and method

Abstract

The invention belongs to the technical field of constructional engineering material detection, and discloses a concrete impermeability detection device and method.The concrete impermeability detection device comprises a base, a supporting seat is fixed to the top end of the base, and a collecting mechanism is fixed to the top end of the supporting seat; a concrete anti-permeability performance detection method comprises the following steps: S1, placing a standard cured columnar concrete test piece in a cabin, and enabling the standard cured columnar concrete test piece to be located at the top end of a connecting cylinder. According to the device, when the belleville spring is pressed downwards, the pressure can be adaptively distributed according to the surface flatness of the test piece through the elastic buffering characteristic of the belleville spring, local pressure fluctuation is absorbed by the belleville spring and is matched with the steel ball for adjustment, and then dynamic sealing compensation between the concrete test piece and the sealing ring is achieved; local leakage of a traditional rigid plate caused by the uneven surface of the test piece is avoided.

Description

Technical Field

[0001] This invention belongs to the field of building materials testing technology, specifically a device and method for testing the impermeability of concrete. Background Technology

[0002] The impermeability of concrete is one of the important indicators for measuring its durability, which directly affects the waterproofing effect and service life of building structures. At present, the industry generally uses water pressure penetration method or chloride ion penetration method for testing. However, these methods have problems such as complex equipment, long testing cycle and results that are greatly affected by human factors. In recent years, with the increasing requirements of the construction industry for concrete performance, the development of efficient and accurate impermeability testing technology has become a research hotspot.

[0003] CN120195073A discloses a concrete permeability testing device, belonging to the technical field of concrete permeability testing. The device includes a lower testing body with a testing platform on its upper part. A hollow area is formed in the center of the testing platform, and a bottom sealing ring and a water inlet are provided on the inner wall of the hollow area. An alignment buffer mechanism, installed on the lower testing body, includes a damping spring, a fixing plate, and an alignment ring, which is correspondingly positioned to the testing platform. An alignment plate, rotatably connected to the alignment ring, includes a plate body and a rotating part; the plate body is kept in an inclined state by a torsion spring. The upper testing body includes a testing cylinder and a telescopic drive assembly. An alignment groove and a placement groove are formed on the inner circumference of the testing cylinder. A pressing component is provided in the alignment groove, and a sealing ring is pre-placed in the placement groove. The testing cylinder is linked to the lower testing body through the telescopic drive assembly. This device can improve sealing performance and automatically align the concrete with the testing cylinder, thus improving work efficiency.

[0004] However, when using this device, it cannot dynamically compensate for concrete specimens. The grooves on the surface of the concrete specimens will affect the final test results, and it will cause stress concentration at the edges of the specimens, causing the specimens to crack due to excessive pressure. It also cannot recycle the water used for measurement. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a device and method for testing the impermeability of concrete.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a concrete impermeability testing device, comprising a base, a support seat fixed to the top of the base, a chamber fixed to the top of the support seat, a pressure mechanism provided to the top of the support seat, a testing mechanism installed at the bottom of the pressure mechanism, and a collection mechanism fixed to the top of the support seat. The pressure mechanism includes a support rod, a top plate, and a hydraulic cylinder. The support rod is fixed to the top of the support base, the top of the support rod is fixed to the top of the top plate, the top of the top plate is fixed to the top of the hydraulic cylinder, a hydraulic connecting rod is installed at the output end of the hydraulic cylinder, and a support plate is fixed to the top of the hydraulic connecting rod. The detection mechanism includes a first pressure plate, a disc spring, and a rubber pressure plate. The first pressure plate is fixed to the bottom end of the support plate, the disc spring is fixed to the bottom end of the first pressure plate, and the rubber pressure plate is fixed to the bottom end of the disc spring. The collection mechanism includes a first one-way valve, a first connecting pipe, and a glass measuring cylinder. The first one-way valve is fixed to the output end of the support base, and the first connecting pipe is fixed to the output end of the first one-way valve. The glass measuring cylinder is fixed to the top of the base.

[0007] Preferably, four sets of support rods are provided, the support rods are symmetrically distributed about the central axis of the support base, the inner wall of the support rod is attached to the outer wall of the support plate, and the support rod and the support plate are slidably connected.

[0008] Preferably, a connecting cylinder is rotatably connected to the top of the support base, a sealing ring is installed at the top of the connecting cylinder, a guide groove is opened at the top of the connecting cylinder, steel balls are installed inside the guide groove, a toothed block is fixed to the outside of the connecting cylinder, a servo motor is fixed to the outside of the cabin, a motor connecting rod is fixed to the rotating end of the servo motor, and a gear is fixed to the outside of the motor connecting rod.

[0009] Preferably, there are six sets of disc springs arranged in a circular array, the output end of the connecting cylinder is connected to a support base, there are eight sets of steel balls that are rotatably connected to the connecting cylinder, and there are several sets of toothed blocks arranged in a circular array about the central axis of the connecting cylinder.

[0010] Preferably, the interior of the cabin is rotatably connected to a motor connecting rod, and the outer wall of the gear is provided with several sets of teeth. The teeth are arranged in a circular array about the central axis of the gear, and the gear and the tooth block are meshed together.

[0011] Preferably, a second water tank is fixed to the top of the base, a delivery pump is fixed to the top of the base, and the output end of the delivery pump is connected to a second delivery pipe.

[0012] Preferably, a float is provided inside the glass measuring cylinder, a first magnet is fixed to the outside of the float, a magnetic switch is fixed to the outside of the glass measuring cylinder, a water pump is fixed to the outside of the glass measuring cylinder, an inlet pipe is installed at the input end of the water pump, a second connecting pipe is installed at the output end of the water pump, a second one-way valve is connected to the output end of the second connecting pipe, a first water tank is connected to the output end of the second one-way valve, and a first delivery pipe is connected to the output end of the first water tank.

[0013] Preferably, the output end of the first connecting pipe is connected to a glass measuring cylinder, the float is slidably connected to a glass measuring cylinder, and the output end of the magnetic switch is electrically connected to a water pump.

[0014] Preferably, the output end of the first conveying pipe is connected to a second water tank, the output end of the second water tank is connected to a conveying pump, and the second conveying pipe and the conveying pump are rotatably connected.

[0015] This invention also provides a method for testing the impermeability of concrete, comprising the following steps: S1. Place the standard-cured columnar concrete specimen inside the chamber and position it at the top of the connecting cylinder. Start the delivery pump to deliver water from the second water tank to the top of the concrete specimen. After the water supply is completed, rotate the second delivery pipe to move it away from the top of the chamber. S2. After the hydraulic cylinder is activated, the hydraulic connecting rod extends and retracts, which in turn drives the support plate to press down. This, in turn, drives the first pressure plate, disc spring and rubber pressure plate to press down and squeeze the water and concrete specimens. Thus, the water is forced through the concrete specimens into the glass measuring cylinder for recording. S3. When the disc spring is pressed down, its own elastic buffering characteristics enable the pressure to be adaptively distributed according to the flatness of the specimen surface. The local pressure fluctuations are absorbed by the disc spring and adjusted with the steel ball, thereby achieving dynamic sealing compensation between the concrete specimen and the sealing ring. This avoids local leakage caused by uneven specimen surface due to traditional rigid plates. It also reduces edge stress concentration of the specimen by distributing the pressure gradient and guides the seeping water through the guide groove, allowing it to enter the glass measuring cylinder through the first one-way valve and the first connecting pipe. When performing dynamic sealing compensation on the concrete specimen, the user can start the servo motor to drive the motor connecting rod and gear to rotate, which in turn drives the connecting cylinder to rotate through the tooth block, thereby cooperating with the steel ball to perform dynamic compensation on the concrete specimen. S4. The seeping water accumulates inside the glass measuring cylinder. The user can record the amount of seepage by marking the scale on the outside of the glass measuring cylinder. As the water accumulates, the float rises due to buoyancy, causing its position to move upward with the water level. When the float reaches the height of the magnetic switch, the Hall sensor inside the magnetic switch detects the magnetic signal and outputs a high level to trigger the relay, starting the water pump to transport the water inside the glass measuring cylinder to the first water tank through the inlet pipe and the second connecting pipe. The second one-way valve prevents backflow. The positions of the float and the first magnet drop, the first magnet moves away from the Hall sensor, the magnetic signal disappears, the Hall sensor outputs a low level, the clutch is de-energized, and the water pump is automatically shut off, completing the emptying of the water collected inside the glass measuring cylinder. Since the amount of water emptied from the glass measuring cylinder each time is equal, the permeability performance of the concrete specimen can be determined by observing the number of times the glass measuring cylinder is emptied and adding the amount of water inside the glass measuring cylinder at the last time.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a first pressure plate, a disc spring, and a rubber pressure plate, enables the device to adaptively distribute pressure according to the flatness of the specimen surface when the disc spring is pressed down, by utilizing its own elastic buffering characteristics. The local pressure fluctuations are absorbed by the disc spring and adjusted in conjunction with steel balls, thereby achieving dynamic sealing compensation between the concrete specimen and the sealing ring, avoiding local leakage caused by uneven specimen surfaces in traditional rigid plates.

[0017] This invention, through the combination of a first one-way valve, a first connecting pipe, and a glass measuring cylinder, enables the device to accumulate water after it seeps into the glass measuring cylinder. The user can record the amount of seepage by observing the scale lines on the outside of the glass measuring cylinder. As the water accumulates, a float rises due to buoyancy, causing its position to move upward with the water level. This, in turn, activates a water pump to empty the water from inside the glass measuring cylinder. The amount of water seepage in the concrete specimen is recorded by observing the number of times the cylinder is emptied and the final scale reading on the glass measuring cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall right-side structure of the present invention; Figure 3 This is a schematic diagram of the overall internal structure of the present invention; Figure 4 This is a schematic diagram of the pressure mechanism structure of the present invention; Figure 5 This is a schematic diagram of the detection mechanism structure of the present invention; Figure 6 This is a schematic diagram of the collection mechanism structure of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of a partial cross-section at point A in the middle.

[0019] In the diagram: 1. Base; 2. Support seat; 3. Cabin; 4. Pressure mechanism; 401. Support rod; 402. Top plate; 403. Hydraulic cylinder; 404. Hydraulic connecting rod; 405. Support plate; 5. Detection mechanism; 501. First pressure plate; 502. Disc spring; 503. Rubber pressure plate; 504. Connecting cylinder; 505. Sealing ring; 506. Guide channel; 507. Steel ball; 508. Tooth block; 509. Servo motor; 51. 0. Motor connecting rod; 511. Gear; 6. Collection mechanism; 601. First check valve; 602. First connecting pipe; 603. Glass measuring cylinder; 604. Float; 605. First magnet; 606. Magnetic switch; 607. Water pump; 608. Inlet pipe; 609. Second connecting pipe; 610. Second check valve; 611. First water tank; 612. First delivery pipe; 7. Second water tank; 8. Delivery pump; 9. Second delivery pipe. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 7 As shown, the present invention provides a concrete impermeability testing device, including a base 1, a support seat 2 fixed to the top of the base 1, a chamber 3 fixed to the top of the support seat 2, a pressure mechanism 4 provided at the top of the support seat 2, a testing mechanism 5 installed at the bottom of the pressure mechanism 4, a collection mechanism 6 fixed to the top of the support seat 2, a second water tank 7 fixed to the top of the base 1, a delivery pump 8 fixed to the top of the base 1, and a second delivery pipe 9 connected to the output end of the delivery pump 8.

[0022] like Figures 1 to 4 As shown, the pressure mechanism 4 includes a support rod 401, a top plate 402, and a hydraulic cylinder 403. The support rod 401 is fixed to the top of the support base 2. The top plate 402 is fixed to the top of the support rod 401. The hydraulic cylinder 403 is fixed to the top of the top plate 402. A hydraulic connecting rod 404 is installed at the output end of the hydraulic cylinder 403. A support plate 405 is fixed to the top of the hydraulic connecting rod 404. There are four sets of support rods 401. The support rods 401 are symmetrically distributed about the central axis of the support base 2. The inner wall of the support rod 401 is attached to the outer wall of the support plate 405. The support rod 401 and the support plate 405 are slidably connected.

[0023] The above scheme is adopted: by starting the hydraulic cylinder 403, the hydraulic connecting rod 404 is extended and retracted, which in turn drives the support plate 405 to press down, thereby driving the first pressure plate 501, disc spring 502 and rubber pressure plate 503 to press down and squeeze the water and concrete specimen.

[0024] like Figures 1 to 7 As shown, the detection mechanism 5 includes a first pressure plate 501, a disc spring 502, and a rubber pressure plate 503. The first pressure plate 501 is fixed to the bottom end of the support plate 405, the disc spring 502 is fixed to the bottom end of the first pressure plate 501, and the rubber pressure plate 503 is fixed to the bottom end of the disc spring 502. A connecting cylinder 504 is rotatably connected to the top end of the support base 2. A sealing ring 505 is installed at the top end of the connecting cylinder 504. A guide groove 506 is opened at the top end of the connecting cylinder 504. Steel balls 507 are installed inside the guide groove 506. Tooth blocks 508 are fixed to the outside of the connecting cylinder 504. Six sets of disc springs 502 are arranged in a ring array. The output end of the connecting cylinder 504 is connected to the support base 2. Eight sets of steel balls 507 are arranged. The steel balls 507 and the connecting cylinder 504 are rotatably connected. Several sets of tooth blocks 508 are arranged in a ring array about the central axis of the connecting cylinder 504.

[0025] like Figures 1 to 7 As shown, a servo motor 509 is fixed to the outside of the cabin 3. A motor connecting rod 510 is fixed to the rotating end of the servo motor 509. A gear 511 is fixed to the outside of the motor connecting rod 510. The motor connecting rod 510 is rotatably connected inside the cabin 3. Several sets of teeth are provided on the outer wall of the gear 511. The teeth are arranged in a circular array about the central axis of the gear 511. The gear 511 and the tooth block 508 are meshed and connected.

[0026] The above scheme is adopted: the disc spring 502 presses down and uses its own elastic buffering characteristics to make the pressure adaptively distributed according to the flatness of the specimen surface. The local pressure fluctuation is absorbed by the disc spring 502 and adjusted in conjunction with the steel ball 507, thereby realizing dynamic sealing compensation between the concrete specimen and the sealing ring 505. This avoids local leakage caused by unevenness of the specimen surface in traditional rigid plates. It also reduces the edge stress concentration of the specimen by distributing the pressure gradient and can guide the seeping water by setting the guide groove 506.

[0027] like Figures 1 to 7As shown, the collection mechanism 6 includes a first one-way valve 601, a first connecting pipe 602, and a glass measuring cylinder 603. The first one-way valve 601 is fixed to the output end of the support base 2. The first connecting pipe 602 is fixed to the output end of the first one-way valve 601. The glass measuring cylinder 603 is fixed to the top of the base 1. A float 604 is provided inside the glass measuring cylinder 603. A first magnet 605 is fixed to the outside of the float 604. A magnetic switch 606 is fixed to the outside of the glass measuring cylinder 603. A water pump 607 is fixed to the outside of the glass measuring cylinder 603. The output end of the first connecting pipe 602 is connected to the glass measuring cylinder 603. The glass measuring cylinder 603 is slidably connected to the outside of the float 604. The output end of the magnetic switch 606 is electrically connected to the water pump 607.

[0028] like Figures 1 to 7 As shown, the water pump 607 has an inlet pipe 608 installed at its input end and a second connecting pipe 609 installed at its output end. The output end of the second connecting pipe 609 is connected to a second check valve 610. The output end of the second check valve 610 is connected to a first water tank 611. The output end of the first water tank 611 is connected to a first delivery pipe 612. The output end of the first delivery pipe 612 is connected to a second water tank 7. The output end of the second water tank 7 is connected to a delivery pump 8. The second delivery pipe 9 and the delivery pump 8 are rotatably connected.

[0029] This invention also provides a method for testing the impermeability of concrete, comprising the following steps: S1. Place the standard-cured columnar concrete specimen inside the chamber 3 and position it at the top of the connecting cylinder 504. Start the delivery pump 8 to deliver water from the second water tank 7 to the top of the concrete specimen. After the water supply is completed, rotate the second delivery pipe 9 to move it away from the top of the chamber 3. S2. After starting the hydraulic cylinder 403, the hydraulic connecting rod 404 extends and retracts, which in turn drives the support plate 405 to press down, thereby driving the first pressure plate 501, disc spring 502 and rubber pressure plate 503 to press down and squeeze the water and concrete specimen. Thus, by pressurizing, water passes through the concrete specimen and enters the glass measuring cylinder 603 for recording. S3. When the disc spring 502 is pressed down, its own elastic buffering characteristics enable the pressure to be adaptively distributed according to the flatness of the specimen surface. The local pressure fluctuations are absorbed by the disc spring 502 and adjusted in conjunction with the steel ball 507, thereby achieving dynamic sealing compensation between the concrete specimen and the sealing ring 505. This avoids local leakage caused by unevenness of the specimen surface in traditional rigid plates. It also reduces the edge stress concentration of the specimen by distributing the pressure gradient, and guides the seeping water through the guide groove 506, allowing it to enter the glass measuring cylinder 603 through the first one-way valve 601 and the first connecting pipe 602. When performing dynamic sealing compensation on the concrete specimen, the user can start the servo motor 509 to drive the motor connecting rod 510 and gear 511 to rotate, which in turn drives the connecting cylinder 504 to rotate through the tooth block 508, thereby cooperating with the steel ball 507 to perform dynamic compensation on the concrete specimen. S4. The seeping water accumulates inside the glass measuring cylinder 603. The user can record the amount of seepage through the scale lines on the outside of the glass measuring cylinder 603. During the accumulation of water, the float 604 floats due to buoyancy, causing its position to rise with the water level. When the float 604 moves to the height of the magnetic switch 606, the Hall sensor inside the magnetic switch 606 detects the magnetic signal, outputs a high level to trigger the relay, and starts the water pump 607 to transport the water inside the glass measuring cylinder 603 through the inlet pipe 608 and the second connecting pipe 609 to the first... Inside the water tank 611, the second one-way valve 610 prevents backflow. The float 604 and the first magnet 605 descend, the first magnet 605 moves away from the Hall sensor, the magnetic signal disappears, the Hall sensor outputs a low level, the clutch is de-energized, thereby automatically shutting off the water pump 607 and emptying the water collected inside the glass measuring cylinder 603. Since the amount of water emptied from the glass measuring cylinder 603 each time is equal, the permeability of the concrete specimen can be determined by observing the number of times the glass measuring cylinder 603 is emptied and adding the amount of water inside the glass measuring cylinder 603 at the last time.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete impermeability testing device, comprising a base (1), characterized in that: The top of the base (1) is fixed with a support seat (2), the top of the support seat (2) is fixed with a chamber (3), the top of the support seat (2) is provided with a pressure mechanism (4), the bottom of the pressure mechanism (4) is installed with a detection mechanism (5), and the top of the support seat (2) is fixed with a collection mechanism (6). The pressure mechanism (4) includes a support rod (401), a top plate (402), and a hydraulic cylinder (403). The support rod (401) is fixed to the top of the support base (2). The top plate (402) is fixed to the top of the support rod (401). The hydraulic cylinder (403) is fixed to the top of the top plate (402). A hydraulic connecting rod (404) is installed at the output end of the hydraulic cylinder (403). A support plate (405) is fixed to the top of the hydraulic connecting rod (404). The detection mechanism (5) includes a first pressure plate (501), a disc spring (502) and a rubber pressure plate (503). The bottom end of the support plate (405) is fixed with the first pressure plate (501), the bottom end of the first pressure plate (501) is fixed with the disc spring (502), and the bottom end of the disc spring (502) is fixed with the rubber pressure plate (503). The collecting mechanism (6) includes a first one-way valve (601), a first connecting pipe (602) and a glass measuring cylinder (603). The first one-way valve (601) is fixed to the output end of the support base (2). The first connecting pipe (602) is fixed to the output end of the first one-way valve (601). The glass measuring cylinder (603) is fixed to the top of the base (1).

2. The concrete impermeability testing device according to claim 1, characterized in that: The support rod (401) is provided in four sets. The support rod (401) is symmetrically distributed about the central axis of the support base (2). The inner wall of the support rod (401) is attached to the outer wall of the support plate (405). The support rod (401) and the support plate (405) are slidably connected.

3. The concrete impermeability testing device according to claim 1, characterized in that: The top of the support base (2) is rotatably connected to a connecting cylinder (504), a sealing ring (505) is installed at the top of the connecting cylinder (504), a guide groove (506) is opened at the top of the connecting cylinder (504), a steel ball (507) is installed inside the guide groove (506), a toothed block (508) is fixed to the outside of the connecting cylinder (504), a servo motor (509) is fixed to the outside of the cabin (3), a motor connecting rod (510) is fixed to the rotating end of the servo motor (509), and a gear (511) is fixed to the outside of the motor connecting rod (510).

4. The concrete impermeability testing device according to claim 3, characterized in that: The disc springs (502) are arranged in six groups and are distributed in a ring array. The output end of the connecting cylinder (504) is connected to the support base (2). The steel balls (507) are arranged in eight groups and are rotatably connected to the connecting cylinder (504). The toothed blocks (508) are arranged in several groups and are distributed in a ring array about the central axis of the connecting cylinder (504).

5. The concrete impermeability testing device according to claim 3, characterized in that: The cabin (3) is rotatably connected to a motor connecting rod (510). The outer wall of the gear (511) is provided with several sets of teeth. The teeth are arranged in a circular array about the central axis of the gear (511). The gear (511) and the tooth block (508) are meshed together.

6. The concrete impermeability testing device according to claim 1, characterized in that: The top of the base (1) is fixed with a second water tank (7) and a delivery pump (8) is fixed with the top of the base (1). The output end of the delivery pump (8) is connected to a second delivery pipe (9).

7. The concrete impermeability testing device according to claim 6, characterized in that: The glass measuring cylinder (603) is equipped with a float (604) inside. A first magnet (605) is fixed to the outside of the float (604). A magnetic switch (606) is fixed to the outside of the glass measuring cylinder (603). A water pump (607) is fixed to the outside of the glass measuring cylinder (603). A water inlet pipe (608) is installed at the input end of the water pump (607). A second connecting pipe (609) is installed at the output end of the water pump (607). The output end of the second connecting pipe (609) is connected to a second one-way valve (610). The output end of the second one-way valve (610) is connected to a first water tank (611). The output end of the first water tank (611) is connected to a first delivery pipe (612).

8. The concrete impermeability testing device according to claim 7, characterized in that: The output end of the first connecting pipe (602) is connected to a glass measuring cylinder (603), the float (604) is slidably connected to the outside of the glass measuring cylinder (603), and the output end of the magnetic switch (606) is electrically connected to a water pump (607).

9. The concrete impermeability testing device according to claim 7, characterized in that: The output end of the first delivery pipe (612) is connected to the second water tank (7), the output end of the second water tank (7) is connected to the delivery pump (8), and the second delivery pipe (9) and the delivery pump (8) are rotatably connected.

10. A method for testing the impermeability of concrete, using a concrete impermeability testing device as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Place the standard-cured columnar concrete specimen inside the chamber (3) and position it at the top of the connecting cylinder (504). Start the delivery pump (8) to deliver the water inside the second water tank (7) to the top of the concrete specimen. After the water source is delivered, rotate the second delivery pipe (9) to move it away from the top of the chamber (3). S2. Start the hydraulic cylinder (403) to drive the hydraulic connecting rod (404) to extend and retract, and then drive the support plate (405) to press down, thereby driving the first pressure plate (501), disc spring (502) and rubber pressure plate (503) to press down and squeeze the water and concrete specimens. Thus, by pressurizing, the water passes through the concrete specimens and enters the glass measuring cylinder (603) for recording. S3. When the disc spring (502) is pressed down, it can use its own elastic buffering characteristics to make the pressure adaptively distributed according to the flatness of the specimen surface. The local pressure fluctuation is absorbed by the disc spring (502) and adjusted with the steel ball (507), thereby realizing dynamic sealing compensation between the concrete specimen and the sealing ring (505). This avoids local leakage caused by unevenness of the specimen surface in traditional rigid plates. It also reduces the edge stress concentration of the specimen by distributing the pressure gradient. Furthermore, it can guide the seeping water through the guide groove (506) so that it enters the glass measuring cylinder (603) through the first one-way valve (601) and the first connecting pipe (602). When the user performs dynamic sealing compensation on the concrete specimen, he can start the servo motor (509) to drive the motor connecting rod (510) and gear (511) to rotate, and then drive the connecting cylinder (504) to rotate through the tooth block (508), thereby cooperating with the steel ball (507) to perform dynamic compensation on the concrete specimen. S4. The seeping water accumulates inside the glass measuring cylinder (603). The user can record the amount of seepage through the scale lines on the outside of the glass measuring cylinder (603). During the accumulation of water, the float (604) floats up due to buoyancy, causing its position to rise with the water level. When the float (604) moves to the height of the magnetic switch (606), the Hall sensor inside the magnetic switch (606) detects the magnetic signal, outputs a high level to trigger the relay, and starts the water pump (607) to transport the water inside the glass measuring cylinder (603) through the inlet pipe (608) and the second connecting pipe (609) to the first Inside the water tank (611), the second one-way valve (610) prevents backflow. The float (604) and the first magnet (605) are lowered. The first magnet (605) moves away from the Hall sensor, the magnetic signal disappears, the Hall sensor outputs a low level, the clutch is de-energized, and the water pump (607) is automatically shut off. The water collected inside the glass measuring cylinder (603) is emptied. Since the amount of water emptied from the glass measuring cylinder (603) is the same each time, the water permeability of the concrete specimen can be determined by observing the number of times the glass measuring cylinder (603) is emptied and adding the amount of water inside the glass measuring cylinder (603) at the last time.

Images