A concrete permeability testing device for highway engineering experiments

Abstract

This application relates to a concrete permeability testing device for highway engineering experiments, belonging to the technical field of concrete testing equipment. It is used to test concrete specimens and includes a test cabinet and a worktable mounted on the test cabinet. Multiple bases are arranged on the worktable, and molds for placing concrete specimens are mounted on the bases. A clamping assembly and multiple auxiliary pressing assemblies are mounted on the worktable and along the circumference of the bases to fix the bases and molds. The clamping assembly includes a hydraulic cylinder, the fixed end of which is mounted on the worktable. A clamping rod is hinged to the piston rod of the hydraulic cylinder for clamping the specimen to the mold. A fixing plate is mounted on the end of the fixed end of the hydraulic cylinder away from the worktable, and a linkage rod is hinged to the fixing plate. The other end of the linkage rod is connected to the clamping rod. This application has the advantages of eliminating the need for manual disassembly and installation, significantly shortening the fixing time, and improving operational convenience.

Description

Technical Field

[0001] This application relates to the technical field of concrete testing equipment, and in particular to a concrete seepage testing device for highway engineering. Background Technology

[0002] In the field of concrete quality testing for highway engineering, concrete permeability is a key indicator for assessing its durability and directly affects the service life of highway structures. Currently, commonly used concrete permeability testing devices in the industry often use multiple screws to fix the mold containing the concrete specimen to the base. This involves placing the mold on the workbench and manually tightening multiple screws to press the mold firmly onto the base on the workbench, thus securing the specimen.

[0003] However, this screw-based fixing method requires individual screw removal and installation before each test, which is cumbersome. Especially when testing multiple concrete specimens in batches, it consumes a lot of manpower and time, resulting in extremely low testing efficiency. In addition, screws are prone to stripping and corrosion after long-term use, further increasing the difficulty of operation and maintenance costs, and failing to meet the efficient and accurate testing requirements in highway engineering. Utility Model Content

[0004] To improve upon the method of manually tightening multiple screws to press the test mold onto the base of the workbench after placing it on the workbench, which requires disassembling and installing screws one by one before each test, resulting in cumbersome operation and extremely low testing efficiency, this application provides a concrete seepage testing device for highway engineering.

[0005] This application provides a concrete seepage testing device for highway engineering, which adopts the following technical solution: A concrete permeability testing device for highway engineering experiments, used for testing concrete specimens, includes a test cabinet and a workbench installed on the test cabinet. Multiple bases are arranged on the workbench, and a mold for placing the concrete specimen is installed on the base. A clamping component and multiple auxiliary pressing components are installed on the workbench and along the circumference of the base to fix the base and the mold. The clamping assembly includes a hydraulic cylinder, the fixed end of which is mounted on the worktable. The piston rod of the hydraulic cylinder is hinged to a clamping rod for clamping to the test mold. A fixing plate is mounted on the end of the fixed end of the hydraulic cylinder away from the worktable. A linkage rod is hinged to the fixing plate, and the other end of the linkage rod is connected to the clamping rod.

[0006] By adopting the above technical solution, the test cabinet provides installation space and protection for the components of the device, while the workbench provides an installation and operation platform for the base, clamping assembly, and auxiliary pressing assembly. Multiple bases can hold and install test molds and concrete specimens, meeting the batch testing needs of highway engineering. In the clamping assembly, the hydraulic cylinder acts as a power source to drive the piston rod to extend and retract, causing the clamping rod to rotate around the hinge point, ensuring balanced force and smooth movement when the clamping rod is pressed down. The auxiliary pressing assembly is distributed circumferentially along the base and works in conjunction with the clamping assembly to fix the base and test mold from multiple directions, effectively preventing the test mold from shifting or loosening during testing, ensuring test stability. Compared with the traditional screw fixing method, there is no need for manual disassembly and installation, greatly shortening the fixing time and improving the convenience of operation.

[0007] Optionally, the auxiliary pressing assembly includes a support, a locking seat, a rotating frame, a first connecting rod, and a second connecting rod. A base plate is mounted on the worktable, and the support is mounted on the base plate. A fixed shaft is mounted on the support, and the locking seat and the rotating frame are sequentially sleeved on the fixed shaft. The locking seat is fixedly mounted on the fixed shaft, and the rotating frame is rotatably mounted on the fixed shaft. An operating lever is rotatably mounted on the other end of the rotating frame. One end of the first connecting rod is rotatably mounted on the locking seat, and the other end is connected to an extension rod. A pressing component is mounted on the other end of the extension rod. One end of the second connecting rod is rotatably connected to the first connecting rod, and the other end is mounted on the rotating frame. The locking seat is provided with a locking groove for locking the end of the second connecting rod. When the pressing component presses down to the test mold, the end of the second connecting rod is locked into the locking groove.

[0008] By adopting the above technical solution, the base plate enhances the connection stability between the auxiliary pressing component and the worktable. The support and fixed shaft provide an installation foundation for the snap-fit ​​seat and the rotating frame. The snap-fit ​​seat is fixed, while the rotating frame can rotate around the fixed shaft. The operator rotates the rotating frame by rotating the operating lever, which in turn pushes the second connecting rod to move. The second connecting rod pulls the first connecting rod to rotate around the hinge point of the snap-fit ​​seat, causing the extension rod to push the pressing component downwards towards the test mold. When the pressing component presses against the test mold, the end of the second connecting rod engages with the snap-fit ​​groove, forming a mechanical locking structure. This maintains the pressing state without continuous force, reducing the operator's labor intensity.

[0009] Optionally, the bottom of the clamping rod away from the oil cylinder and the bottom of the pressing member are both provided with buffers for interacting with the test mold.

[0010] By adopting the above technical solution, the buffer component can buffer the impact force between the clamping rod and the lowering component and the mold during the pressing process, avoiding rigid contact that could cause damage to the edge of the mold or the surface of the concrete specimen, thus protecting the integrity of the mold and the specimen. Simultaneously, the buffer component undergoes slight deformation under pressure, filling small protrusions or depressions on the surface of the mold, increasing the contact area with the mold, improving sealing, preventing water pressure leakage from contact gaps during testing, ensuring the accuracy of seepage test data, and reducing test errors caused by sealing problems.

[0011] Optionally, the pressing member is arranged in an I-shape.

[0012] By adopting the above technical solutions, the I-shaped structure, compared with the traditional flat plate structure, reduces the weight of the components while ensuring the strength of the pressing component itself, thereby reducing the load on transmission components such as the rotating frame and connecting rods, and extending the service life of the assembly. In addition, the I-shaped pressing component, which receives the power transmitted by the extension rod, can concentrate the dispersed force and apply it evenly to the top of the test mold ring. At the same time, its own structural shape balances the force, avoids local stress concentration, and further improves the fixing effect.

[0013] Optionally, the base is provided with a plurality of positioning posts, and the bottom of the test mold is provided with positioning holes that cooperate with the positioning posts, and the positioning posts are inserted into the positioning holes.

[0014] By adopting the above technical solution, the positioning column and the positioning hole form a positioning fit. When installing the test mold, the operator only needs to align the positioning hole with the positioning column and insert it to quickly complete the positioning and placement of the test mold, avoid the test mold placement deviation, ensure that the relative position of the test mold and the base is consistent in each test, and improve the consistency of batch testing.

[0015] Optionally, a water tank and a water pump are installed at the bottom of the test cabinet. The water tank is connected to multiple delivery pipes through the water pump. The multiple delivery pipes are connected to multiple bases. The delivery pipes and the bases are arranged in a one-to-one correspondence. The bases are provided with water outlet holes that communicate with the bottom of the test mold.

[0016] By adopting the above technical solution, the water tank is used to store the water required for testing, and the water pump provides power to transport the water in the tank to each base through the delivery pipe. Each delivery pipe corresponds to a base, allowing for individual water supply to the molds on different bases, while simultaneously conducting multiple sets of tests with different parameters, thus improving testing efficiency. The water outlet introduces the water transported by the delivery pipe to the bottom of the mold, allowing the water to contact the bottom surface of the concrete specimen, simulating a real water seepage scenario. Excess water can be returned or discharged through the water outlet.

[0017] Optionally, the test cabinet is equipped with a control panel and a controller, the controller is electrically connected to the control panel, a pressure device for connecting to the base is installed at the bottom of the test cabinet, an electrically controlled valve is installed on the delivery pipe, and the controller is electrically connected to the pressure device, the water pump and the electrically controlled valve respectively.

[0018] By adopting the above technical solution, operators can input test parameters through the control panel. After receiving the command, the controller automatically controls the water pump to start, the electric valve to switch on and off, and the pressurizing component to operate. The electric valve controls the flow and interruption of water in the delivery pipe, and the pressurizing component applies pressure to the water in the base, simulating the seepage of concrete specimens under different water pressure environments, thus meeting the testing needs of concrete of different strength grades in highway engineering. The entire control process is highly automated, requiring no manual adjustment of water pressure and flow. When an abnormality occurs, an alarm is triggered and operation is stopped in a timely manner, ensuring test safety and data accuracy.

[0019] Optionally, the base is provided with a storage groove for placing the sealing ring.

[0020] By adopting the above technical solution, the storage groove provides a fixed installation position for the sealing ring, preventing the sealing ring from shifting or falling off during the test; the sealing ring is installed between the base and the test mold, filling the tiny gaps on the contact surfaces of the two, improving the sealing performance, and preventing water from leaking from the gaps between the base and the test mold during the test, which could lead to a drop in water pressure or misjudgment of water leakage data.

[0021] In summary, this application includes at least one of the following beneficial technical effects: This device uses a combination of clamping components and auxiliary pressing components to fix the test mold from multiple angles, replacing the traditional screw fixing method. It eliminates the need for manual disassembly and installation, significantly reducing the fixing time. The multi-directional fixing can effectively prevent the test mold from shifting. At the same time, the cooperation between the positioning pins and positioning holes ensures accurate positioning of the test mold, improving the efficiency and consistency of batch testing. The auxiliary pressing component, driven by a manually operated lever, uses the transmission of the rotating frame and linkage mechanism to apply uniform pressure to the mold. Simultaneously, it achieves self-locking through the engagement of the locking slot and the second linkage. Together with the pressing component, it completes the quick and reliable fixing of the mold, replacing the traditional screw tightening method. Only the operation lever needs to be rotated to complete the pressing and locking, greatly reducing the number of steps in mold assembly and disassembly and improving the efficiency of batch testing. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the structure from another angle of an embodiment of this application; Figure 3 This is a schematic diagram of the clamping component in an embodiment of this application; Figure 4 This is a schematic diagram of the auxiliary pressing component in the pressing state in the embodiment of this application; Figure 5 This is an exploded view of the auxiliary pressing component according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure inside the test cabinet in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the base, the clamping assembly, and the auxiliary pressing assembly in the embodiments of this application.

[0023] Explanation of reference numerals in the attached figures: 1. Test cabinet; 11. Water tank; 12. Control panel; 13. Pressurizing component; 14. Side cabinet door; 15. Return water tank; 2. Workbench; 21. Base; 211. Positioning column; 212. Sealing ring; 22. Test mold; 23. Base plate; 3. Pressurizing assembly; 31. Hydraulic cylinder; 311. Piston rod; 32. Pressurizing rod; 33. Fixing plate; 34. Linkage rod; 4. Auxiliary pressing assembly; 41. Support; 411. Fixed shaft; 42. Snap-fit ​​seat; 421. Snap-fit ​​groove; 43. Rotating frame; 44. Operating lever; 45. Extension rod; 46. Pressurizing component; 47. First connecting rod; 48. Second connecting rod. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0028] This application discloses a concrete permeability testing device for highway engineering experiments, used for testing concrete specimens, with reference to... Figures 1-3 The concrete permeability testing device for highway engineering includes a test cabinet 1 and a workbench 2 installed on the test cabinet 1. Multiple bases 21 are arranged on the workbench 2. A test mold 22 for placing concrete specimens is installed on the base 21. A clamping component 3 and multiple auxiliary pressing components 4 are installed on the workbench 2 and along the circumference of the base 21 to fix the base 21 and the test mold 22. The clamping assembly 3 includes a hydraulic cylinder 31. The fixed end of the hydraulic cylinder 31 is mounted on the worktable 2. The piston rod 311 of the hydraulic cylinder 31 is hinged to a clamping rod 32 for clamping to the test mold 22. A fixing plate 33 is mounted on the end of the fixed end of the hydraulic cylinder 31 away from the worktable 2. A linkage rod 34 is hinged on the fixing plate 33. The other end of the linkage rod 34 is connected to the clamping rod 32.

[0029] In this device, test cabinet 1 provides the mounting base for components such as workbench 2, water tank 11, water pump, and pressurizing component 13, and also protects the internal electrical components and water system from damage caused by external dust, water stains, or collisions. Workbench 2 serves as the mounting carrier for base 21, clamping assembly 3, and auxiliary pressing assembly 4, and also provides a horizontal operating platform for the placement and fixation of test mold 22. Base 21 provides the positioning and mounting foundation for test mold 22, and must be connected to the delivery pipe to achieve water conduction, that is, to introduce water from water tank 11 into the bottom of test mold 22. Test mold 22 is used to hold concrete specimens; its internal shape and dimensions are adapted to the concrete specimens to ensure that the specimens meet the testing requirements.

[0030] In the clamping assembly 3, the hydraulic cylinder 31 serves as the power source, converting hydraulic energy into mechanical energy. The extension and retraction of the piston rod 311 drives the clamping rod 32, providing stable and controllable downward pressure for fixing the mold 22. The pressure of the hydraulic cylinder 31 can be adjusted by a controller to adapt to the fixing requirements of concrete specimens of different strengths, avoiding damage to the specimens due to excessive pressure or insecure fixing due to insufficient pressure. The controllable downward pressure setting replaces the traditional manual screw-tightening method, achieving automated clamping, significantly shortening the fixing time, and solving the problems of cumbersome and inefficient traditional operations. The controllable downward pressure setting ensures consistent fixing pressure each time, avoiding uneven force application that could cause stress imbalance on the mold 22, thus improving the consistency of batch testing. In this application, to adapt to the height of the base 21 and the bottom ring of the mold 22, the fixing end of the hydraulic cylinder 31 can be embedded and installed in the workbench 2 or extended into the test cabinet 1.

[0031] The clamping rod 32 converts the power output from the hydraulic cylinder 31 into downward pressure on the mold 22, thereby clamping and fixing the mold 22. The length of the clamping rod 32 is adapted to the size of the mold 22, ensuring that the pressure is applied evenly to the bottom annular end face of the mold 22. The fixing plate 33 serves as the fixed support point for the linkage rod 34, providing a hinge base for the linkage rod 34, limiting the movement trajectory of the linkage rod 34, and ensuring that it works in conjunction with the clamping rod 32 to form a triangular stable structure. The triangular stable structure can disperse the clamping force, reduce the stress load on the hydraulic cylinder 31 and the clamping rod 32, extend the service life of the components, thereby improving the structural stability of the clamping assembly 3 and preventing the clamping rod 32 from shaking or shifting when the piston rod 311 of the hydraulic cylinder 31 extends or retracts.

[0032] The linkage rod 34 restricts the movement direction of the clamping rod 32, ensuring its smooth rotation around the hinge point. It also helps to disperse the clamping force, preventing excessive force on one end of the clamping rod 32 and thus avoiding deformation. This ensures the smoothness and accuracy of the clamping rod 32's movement, preventing misalignment of the mold 22 due to movement deviation and improving fixing precision. The length of the linkage rod 34 must be set to ensure that the clamping rod 32 can be accurately pressed down to the designated position on the mold 22.

[0033] The auxiliary pressing component 4 is distributed circumferentially along the base 21 and works in conjunction with the clamping component 3 to provide auxiliary fixation for the test mold 22 from multiple directions, supplementing the pressure of the clamping component 3 and ensuring that the test mold 22 does not shift or loosen during testing. The auxiliary pressing component 4 is usually manually operated, and its installation position and quantity can be flexibly adjusted according to the size of the test mold 22 and the available space, adapting to different testing scenarios and improving the versatility of the device. At the same time, it does not require an additional power source, reducing equipment costs and energy consumption.

[0034] In this concrete permeability testing device for highway engineering, the test cabinet 1 and the workbench 2 provide a frame support structure. The base 21 and the test mold 22 are used to achieve the positioning and sealing installation of the concrete specimen. The test mold 22 is fixed by multiple positions of the clamping component 3 and the auxiliary pressing component 4, which replaces the traditional screw fixing method. There is no need for manual disassembly and installation, which greatly shortens the fixing time of the test mold 22 and improves the convenience of operation and testing efficiency.

[0035] Reference Figure 1 Multiple positioning posts 211 are provided on the base 21. Positioning holes, which mate with the positioning posts 211, are opened at the bottom of the mold 22. The positioning posts 211 are protruding structures on the base 21, used to mate with the positioning holes at the bottom of the mold 22. In concrete seepage tests, the positioning posts 211 provide installation guidance for the mold 22, ensuring that the mold 22 can be quickly aligned with the preset position on the base 21, preventing misalignment during placement and thus shortening the clamping time. The positioning holes receive the positioning posts 211, and their diameter and depth match the diameter and height of the positioning posts 211. When placing the mold 22 before testing, the positioning holes, through their engagement with the positioning posts 211, ensure the consistency of the mold 22's installation position each time.

[0036] Reference Figure 1 , Figure 4 and Figure 5 The auxiliary pressing assembly 4 includes a support 41, a locking seat 42, a rotating frame 43, a first connecting rod 47, and a second connecting rod 48. A base plate 23 is installed on the workbench 2. The support 41 is installed on the base plate 23. A fixed shaft 411 is installed on the support 41. The locking seat 42 and the rotating frame 43 are sequentially sleeved on the fixed shaft 411. The locking seat 42 is fixedly installed on the fixed shaft 411, and the rotating frame 43 is rotatably mounted on the fixed shaft 411. The other end of the rotating frame 43 is rotatably mounted on the fixed shaft 411. The device is equipped with an operating lever 44. One end of the first connecting rod 47 is rotatably mounted on the snap-fit ​​seat 42, and the other end is connected to an extension rod 45. The other end of the extension rod 45 is equipped with a pressing member 46. One end of the second connecting rod 48 is rotatably connected to the first connecting rod 47, and the other end is mounted on the rotating frame 43. The snap-fit ​​seat 42 is provided with a snap-fit ​​groove 421 for snapping the end of the second connecting rod 48. When the pressing member 46 is pressed down to the test mold 22, the end of the second connecting rod 48 is snapped into the snap-fit ​​groove 421.

[0037] The base plate 23 provides a load-bearing platform for the entire assembly, while the support 41 provides an installation support point for the fixed shaft 411, connecting the base plate 23 with other transmission components to maintain the assembly's vertical structure. The fixed shaft 411 passes through the locking seat 42 and the rotating frame 43, providing a rotation fulcrum for the rotating frame 43 and enabling coaxial assembly of the locking seat 42 and the rotating frame 43, ensuring smooth rotation of the rotating frame 43 around the fixed shaft 411. The locking seat 42 is fixed to the fixed shaft 411, providing a rotation support point for the first connecting rod 47. Its locking groove 421 is used to lock the end of the second connecting rod 48, achieving the self-locking function of the assembly. That is, the engagement between the locking groove 421 and the second connecting rod 48 can lock the structural state after pressure is applied, maintaining the downward pressure effect without continuous force, thus improving operational convenience.

[0038] The rotating frame 43 rotates around the fixed shaft 411. One end is connected to the operating lever 44 to receive manual drive, and the other end is connected to the second connecting rod 48 to transmit power. This converts the force exerted by the operator rotating the operating lever 44 into the power to drive the second connecting rod 48, achieving a change and transmission of force direction. This makes the pressing action more in line with operating habits, saving effort and increasing efficiency. The operating lever 44 provides the operator with a force application point, reducing the force required for the pressing operation and making manual operation more effortless and convenient. Its rotation drives the rotating frame 43 to move synchronously. The first connecting rod 47 receives the power transmitted from the second connecting rod 48 and drives the extension rod 45 to move up and down, achieving longitudinal power transmission. This converts the rotational motion of the rotating frame 43 into the linear pressing motion of the extension rod 45, ensuring continuous power transmission and making the pressing action smooth and controllable.

[0039] The extension rod 45 extends the power transmission path and adjusts the effective height of the pressing component 46 to match the installation position of the test mold 22. This ensures that the pressing component 46 is precisely aligned with the pressing part of the test mold 22, preventing pressing offset caused by installation position limitations and ensuring accurate pressure application to the test mold 22. The pressing component 46 directly contacts the test mold 22, converting the power transmitted by the connecting rod into a pressing force on the test mold 22, and fixing it to the surface of the test mold 22. The two ends of the second connecting rod 48 are respectively hinged to the rotating frame 43 and the first connecting rod 47, forming a transmission connecting rod mechanism. This mechanism transmits the power of the rotating frame 43 to the first connecting rod 47 and simultaneously engages with the locking groove 421 for self-locking. When the pressing is in place, it engages with the locking groove 421, locking the entire transmission structure and ensuring a stable and reliable pressing state. The locking groove 421 is located on the locking seat 42, reserving a locking space at the end of the second connecting rod 48 to provide a locking point for the component, preventing the component from springing back after pressing and ensuring that the test mold 22 is always in a stable pressing state.

[0040] Reference Figure 4 and Figure 5The pressing component 46 is arranged in an I-shape. The I-shaped pressing component 46 receives the power transmitted by the extension rod 45, concentrating and evenly applying the dispersed force to the annular top of the mold 22. Simultaneously, its structural shape balances the force, preventing localized stress concentration. The symmetrical I-shaped structure ensures uniform force distribution during pressing, ensuring consistent pressure across all areas of the top of the mold 22. This prevents uneven pressure from causing the mold 22 to tilt or causing localized damage to the concrete specimen, guaranteeing pressure coverage of the pressing area of ​​the mold 22. Furthermore, compared to a solid block pressing component 46, the I-shaped structure significantly reduces its weight while maintaining structural strength, lowering the load on the extension rod 45 and the linkage mechanism, reducing resistance during the rotation of the operating rod 44, and making it easier for the operator.

[0041] Both the bottom of the clamping rod 32 away from the hydraulic cylinder 31 and the bottom of the pressing member 46 are equipped with buffers for interaction with the mold 22. These buffers are made of elastic materials such as rubber or silicone. The buffer at the bottom of the clamping rod 32 away from the hydraulic cylinder 31 is a flexible connecting layer, effectively absorbing the instantaneous impact force when the clamping rod 32 is pressed down. This prevents damage to the edges of the mold 22 or indentations and cracks on the surface of the concrete specimen due to excessive driving force of the hydraulic cylinder 31 or excessive clamping speed, thus protecting the integrity of the mold 22 and the specimen. The elastic deformation characteristics can fill the tiny gaps on the top surface of the mold 22, increasing the contact area between the clamping rod 32 and the mold 22, allowing the clamping force to be transmitted more evenly to the mold 22, and reducing local pressure concentration. The flexible contact of the buffer reduces frictional loss between the clamping rod 32 and the mold 22, extending the service life of both and reducing the frequency of component replacement and maintenance costs.

[0042] The buffer material at the bottom of the pressure member 46 is the same as that at the bottom of the clamping rod 32, which prevents the rigid horizontal plate of the I-shaped pressure member 46 from directly contacting the mold 22 and prevents the mold 22 from deforming due to excessive local stress. The deformation of the buffer compensates for the deformation, ensuring uniform clamping force in all areas of the top of the mold 22, further enhancing the sealing effect between the mold 22 and the base 21, reducing leakage problems caused by uneven pressure, and ensuring the accuracy of water seepage test data.

[0043] Reference Figure 6 The test cabinet 1 contains a water tank 11 and a water pump at its bottom. The water tank 11 is connected to multiple delivery pipes via the water pump, which in turn connect to multiple bases 21. Each delivery pipe corresponds to one base 21. Each base 21 has a water outlet in its center that connects to the bottom of the test mold 22. The water tank 11 provides a sufficient water source for the seepage test, preventing interruptions due to water shortage and ensuring the continuity of the test. The water pump provides power for the water flow, ensuring that clean water is stably and efficiently delivered to each base 21, meeting the water pressure requirements for concrete seepage testing. By adjusting the water pump pressure, the test requirements for concrete specimens of different strength grades can be accommodated.

[0044] The delivery pipe is the water flow channel connecting the water pump and the base 21. A one-to-one connection ensures that each base 21 receives an independent and stable water supply, allowing multiple sets of concrete specimens to be tested simultaneously without interference, significantly improving testing efficiency. Independent delivery pipes facilitate control of the water flow to a single base 21; when a set of specimens is tested and an anomaly occurs, the water flow to that base 21 can be cut off without affecting the testing progress of other specimens. Furthermore, the delivery pipe is typically made of corrosion-resistant and non-deformable materials, reducing pressure loss during water delivery, ensuring the water pressure reaching the base 21 meets testing requirements, extending pipeline lifespan, and reducing maintenance costs.

[0045] The water outlet can evenly guide the pressurized water in the base 21 to the bottom of the concrete specimen in the mold 22, ensuring that the pressurized water acts evenly on the specimen from the bottom of the concrete specimen. The water outlet is located in the middle of the base 21, which can concentrate the water flow on the core area of ​​the specimen, reduce the water flow stagnation in the base 21, and ensure the efficient conduct of the test process.

[0046] Reference Figure 1 The test cabinet 1 is equipped with a control panel 12 and a controller. The controller is electrically connected to the control panel 12. A pressure-pressurizing component 13 for connection to the base 21 is installed at the bottom of the test cabinet 1. An electrically controlled valve is installed on the delivery pipe. The controller is electrically connected to the pressure-pressurizing component 13, the water pump, and the electrically controlled valve. The control panel 12, through a visual operating interface, allows for quick test preparation and process control, and provides real-time feedback of test data. This enables operators to promptly grasp the operating status of each test unit. If an abnormal pressure or water leakage is detected in a base 21, adjustment commands can be immediately issued through the panel, improving the controllability of the testing process.

[0047] The controller has a built-in preset control program and data processing module. It receives operation commands from the control panel 12 and simultaneously collects operating data from components such as the pressurizing component 13, the electrically controlled valve, and the water pump. Based on the program logic, it precisely controls each component. In the concrete seepage test, the controller coordinates the start and stop of the water pump, the opening and closing of the electrically controlled valve, and the pressure output of the pressurizing component 13 to ensure that the actions of each component are synchronized and the parameters are accurate. At the same time, it records the test data and determines whether the test is proceeding normally, thus achieving automated control of the testing process.

[0048] The pressurizing component 13 is typically an electric pressurizing pump or a pneumatically driven device. It receives instructions from the controller and delivers water at a set pressure into the base 21, simulating the water pressure environment experienced by concrete in actual engineering projects. During the test, the pressure output is adjusted in real time based on feedback from the controller to ensure stable pressure within the base 21, meeting the pressure requirements for seepage testing of different concrete specimens.

[0049] The electrically controlled valve opens or closes the pipeline according to instructions, and can independently control the water supply to the corresponding base 21. Before the test, the electrically controlled valve receives an instruction from the controller to open, allowing water pumped by the water pump to enter the base 21 through the delivery pipe; when the test is completed or a specimen leaks, the controller instructs it to close, cutting off the water supply to the corresponding pipeline, avoiding water waste or affecting other test units, and realizing independent water supply control for multiple test units.

[0050] Reference Figure 7 The base 21 has a groove for placing the sealing ring 212. The groove is an annular groove structure on the top of the base 21, which provides a fixed installation space for the sealing ring 212 and restricts its displacement during the test. In the concrete seepage test of highway engineering, the sealing ring 212 fits against the contact interface between the mold 22 and the base 21, forming a sealing ring around the bottom of the mold 22, preventing pressurized water from leaking from the gap between the mold 22 and the base 21. The sealing ring 212 is usually made of water-resistant and aging-resistant rubber or silicone, and is annular or in a shape that matches the groove. After being installed in the groove, it is squeezed and deformed when the mold 22 is pressed down, filling the tiny gap between the bottom of the mold 22 and the top of the base 21, forming a flexible sealing barrier.

[0051] Reference Figure 6 The test cabinet 1 has a side door 14 on one side, and a return water tank 15 is installed inside the side door 14. A return water pipe is installed at the bottom of the workbench 2, and the return water pipe is connected to the return water tank 15. The side door 14 is connected to the main body of the test cabinet 1 by a hinge, which can realize the opening and closing of the internal space of the test cabinet 1. The return water tank 15 is a container for collecting water that seeps in during the test. Its size is designed according to the maximum seepage volume in a single test. It is installed inside the side door 14 and can move synchronously with the opening and closing of the side door 14. In the concrete seepage test, when water seeps in the concrete specimen, the seepage water will flow into the return water tank 15 through a preset path. The return water tank 15 temporarily stores the seepage water to prevent the seepage water from dripping directly into the bottom of the test cabinet 1, avoiding equipment damage from moisture or ground contamination, and ensuring the electrical safety of the equipment. The movable nature of the return water tank 15 allows operators to open the cabinet door after the test, directly remove the return water tank 15 to empty the seepage water or conduct water quality testing, simplifying the seepage treatment process and reducing the intensity of operation. The return water pipe is a water supply channel connecting the test area and the return water tank 15. It guides the water seeping from the concrete specimen from the workbench 2 area to the return water tank 15, ensuring that the seepage water flows in an orderly manner and avoiding stagnation in the workbench 2.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A concrete permeability testing device for highway engineering experiments, used for testing concrete specimens, characterized in that: The test cabinet (1) and the workbench (2) installed on the test cabinet (1) are provided. Multiple bases (21) are arranged on the workbench (2). A mold (22) for placing the concrete specimen is installed on the base (21). A clamping assembly (3) and multiple auxiliary pressing assemblies (4) are installed on the workbench (2) and along the circumference of the base (21) to fix the base (21) and the mold (22). The clamping assembly (3) includes a hydraulic cylinder (31), the fixed end of which is mounted on the workbench (2). The piston rod (311) of the hydraulic cylinder (31) is hinged to a clamping rod (32) for clamping to the test mold (22). A fixing plate (33) is mounted on the end of the fixed end of the hydraulic cylinder (31) away from the workbench (2). A linkage rod (34) is hinged on the fixing plate (33), and the other end of the linkage rod (34) is connected to the clamping rod (32).

2. The concrete permeability testing device for highway engineering experiments according to claim 1, characterized in that: The auxiliary pressing assembly (4) includes a support (41), a locking seat (42), a rotating frame (43), a first connecting rod (47), and a second connecting rod (48). A base plate (23) is installed on the workbench (2). The support (41) is mounted on the base plate (23). A fixed shaft (411) is installed on the support (41). The locking seat (42) and the rotating frame (43) are sequentially sleeved on the fixed shaft (411). The locking seat (42) is fixedly installed on the fixed shaft (411). The rotating frame (43) is rotatably mounted on the fixed shaft (411). An operating lever (44) is rotatably mounted on the other end. One end of the first connecting rod (47) is rotatably mounted on the snap-fit ​​seat (42), and the other end is connected to an extension rod (45). A pressing member (46) is mounted on the other end of the extension rod (45). One end of the second connecting rod (48) is rotatably connected to the first connecting rod (47), and the other end is mounted on the rotating frame (43). The snap-fit ​​seat (42) is provided with a snap-fit ​​groove (421) for snapping the end of the second connecting rod (48). When the pressing member (46) is pressed down to the test mold (22), the end of the second connecting rod (48) is snapped into the snap-fit ​​groove (421).

3. The concrete permeability testing device for highway engineering experiments according to claim 2, characterized in that: Both the bottom of the clamping rod (32) away from the oil cylinder (31) and the bottom of the pressing member (46) are provided with buffers for interacting with the test mold (22).

4. The concrete seepage testing device for highway engineering as described in claim 2, characterized in that: The pressing component (46) is arranged in an I-shape.

5. The concrete permeability testing device for highway engineering as described in claim 1, characterized in that: The base (21) is provided with a plurality of positioning posts (211), and the bottom of the test mold (22) is provided with positioning holes that cooperate with the positioning posts (211), and the positioning posts (211) are inserted into the positioning holes.

6. The concrete permeability testing device for highway engineering as described in claim 1, characterized in that: The test cabinet (1) is equipped with a water tank (11) and a water pump at the bottom. The water tank (11) is connected to multiple delivery pipes through the water pump. The multiple delivery pipes are connected to multiple bases (21). The delivery pipes are arranged in a one-to-one correspondence with the bases (21). The bases (21) have water outlet holes that communicate with the bottom of the test mold (22).

7. The concrete seepage testing device for highway engineering as described in claim 6, characterized in that: The test cabinet (1) is equipped with a control panel (12) and a controller. The controller is electrically connected to the control panel (12). A pressure device (13) for connecting to the base (21) is installed at the bottom of the test cabinet (1). An electric control valve is installed on the pipeline of the delivery pipe. The controller is electrically connected to the pressure device (13), the water pump and the electric control valve respectively.

8. The concrete permeability testing device for highway engineering as described in claim 1, characterized in that: The base (21) is provided with a storage groove for placing the sealing ring (212).

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