An ultrahigh performance concrete tidal wetting-drying erosion simulation test device

Abstract

The application provides a kind of super high performance concrete tidal wet-dry alternation erosion simulation test device, and relates to concrete test technical field, including test bin, wave making mechanism, stroke control mechanism and water inlet and outlet control mechanism;Water inlet and water outlet are opened on test bin, and concrete sample is installed in test bin;Wave making mechanism includes first rotating column, movable crank, rocker, push plate and driving assembly, push plate is slidably installed in test bin, first rotating column is rotatably installed in test bin and sleeve is arranged on it, movable crank is axially movably installed in sleeve, movable crank is rotatably connected with rocker, rocker is rotatably connected with push plate, and driving assembly is used to drive first rotating column to rotate;Stroke control mechanism is used to drive movable crank to move;Water inlet and outlet control mechanism is used to open and close water inlet and water outlet.The application realizes adaptive matching of wave amplitude and tidal level, and accurately reproduces the natural law of large rising tide and small ebb tide in offshore tidal area.

Description

Technical Field

[0001] This invention relates to the field of concrete testing technology, specifically to a simulation test device for tidal wet-dry alternation erosion of ultra-high performance concrete. Background Technology

[0002] As marine engineering construction expands into deep-sea areas, ultra-high performance concrete (UHPC) has become a core material for marine structures due to its ultra-high strength and high corrosion resistance. The tidal zone, where wet and dry conditions alternate, is the service area where marine concrete is most severely corroded and damaged. Its erosion process is the result of the coupled effects of multiple factors, including water level rise and fall, wave erosion, and salt spray drying. Accurately reproducing the real erosion environment of this area is a core prerequisite for assessing the long-term durability of UHPC and guiding its engineering applications.

[0003] However, the current operating conditions of existing tidal erosion test devices are out of sync with the real environment. Most devices can only achieve simple water level rise and fall, and do not match the natural law that the amplitude of the rising tide increases synchronously with the water level and the amplitude of the receding tide decreases synchronously with the receding tide, resulting in deviations between the test data and the actual service performance of the project.

[0004] Therefore, there is an urgent need to develop a simulation test device to match wave amplitude with water level changes, thereby reproducing the real coupled erosion environment of the nearshore tidal zone. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes an ultra-high performance concrete tidal wet-dry alternating erosion simulation test device to solve the problem that existing tidal erosion test devices cannot simulate the relationship between the magnitude of nearshore tidal wave amplitude and the increase or decrease of water level.

[0006] The objective of this invention is achieved through the following technical solution: This invention provides an ultra-high performance concrete tidal wet-dry alternating erosion simulation test device, including a test chamber, a wave-generating mechanism, a stroke control mechanism, and an inlet / outlet water control mechanism; The test chamber is equipped with an inlet and an outlet. The inlet is connected to a water tank and the outlet is connected to a drainage tank. A concrete sample is installed inside the test chamber. The wave-making mechanism includes a first rotating column, a movable crank, a rocker arm, a pusher plate, and a drive assembly. The pusher plate is slidably installed in the test chamber along the direction of approaching or moving away from the concrete sample. The first rotating column is rotatably installed in the test chamber and is provided with a sleeve. The movable crank is axially movable inside the sleeve. One end of the movable crank is rotatably connected to one end of the rocker arm, and the other end of the rocker arm is rotatably connected to the pusher plate. The drive assembly is used to drive the first rotating column to rotate. The stroke control mechanism is used to drive the movable crank to move; The inlet and outlet water control mechanism is used to open and close the inlet and outlet water.

[0007] Furthermore, the drive assembly includes a second rotating column and a motor. The second rotating column is rotatably mounted inside the test chamber and is connected to the first rotating column via a first transmission belt. The motor is mounted on the test chamber and is connected to the second rotating column.

[0008] Furthermore, one sleeve is provided at each end of the first rotating column, and a movable crank and a rocker arm are respectively installed thereon. The stroke control mechanism includes an internal threaded cylinder and a bevel gear ring. The two internal threaded cylinders are axially rotatably installed in the two sleeves respectively. A second transmission belt is connected between the two internal threaded cylinders. The movable crank has an external thread and is threaded into the internal threaded cylinder. A bevel gear is provided on the outer wall of the internal threaded cylinder. The two bevel gear rings are movably sleeved on the outside of the first rotating column with the first rotating column as the center, and can mesh with the bevel gear on the same side. The bevel gear rings are slidably but non-rotatably installed in the test chamber along the axial direction of the first rotating column.

[0009] Furthermore, the first rotating column has a connecting cavity, which communicates with the interior of the two sleeves respectively, and the second transmission belt is located in the connecting cavity and is sleeved on the two internally threaded sleeves.

[0010] Furthermore, the inlet and outlet are respectively located on both sides of the test chamber. The water inlet and outlet control mechanism includes a moving frame and an intermittent control component. The moving frame is slidably installed inside the test chamber and its two sides can respectively abut against the inlet and outlet. The two bevel gear rings are respectively installed on the moving frame through brackets. When the moving frame blocks the inlet or outlet, one bevel gear ring will mesh with the bevel gear on the same side while the other bevel gear ring will separate from the other bevel gear. The intermittent control component is used to drive the moving frame to move.

[0011] Furthermore, the intermittent control assembly includes a worm gear and a drive disk. The worm gear is coaxially mounted on the second rotating column, and the drive disk is rotatably mounted inside the test chamber and located inside the moving frame. A turbine gear that meshes with the worm gear is coaxially mounted on the drive disk, and an enlarged diameter section is provided in the edge half of the drive disk. The enlarged diameter section can push one side of the moving frame it passes through to abut against the inner wall of the test chamber.

[0012] Furthermore, the water inlet is located at the top of one side of the test chamber, and the water outlet is located at the bottom of the other side of the test chamber.

[0013] Furthermore, an overflow port is provided on the bottom side of the push plate.

[0014] Furthermore, a return water pipe is connected between the water tank and the drain tank, and a water pump is installed on the return water pipe.

[0015] Furthermore, a ring frame is installed around the concrete sample in the test chamber, and multiple fans are installed around the ring frame, with the air outlet of each fan facing the concrete sample.

[0016] As can be seen from the above technical solution, the present invention provides an ultra-high performance concrete tidal wet-dry alternating erosion simulation test device: 1. The first rotating column drives the movable crank to perform circular motion via a sleeve. The movable crank converts this circular motion into the horizontal reciprocating linear motion of the push plate via a rocker arm. The push plate pushes the water in the test chamber to generate waves, which act on the surface of the concrete sample. The inlet and outlet control mechanism controls the opening and closing of the water inlet, and the water level in the test chamber gradually rises to simulate a high tide. At the same time, the stroke control mechanism gradually extends the effective length of the movable crank extending from the sleeve, increasing the reciprocating stroke of the push plate, so that the wave amplitude increases synchronously with the rise in water level. When the water level reaches the set maximum value, the inlet and outlet control mechanism controls the closing of the water inlet. With the outlet closed and the water level in the test chamber gradually decreasing to simulate the ebb tide, the effective length of the movable crank is gradually shortened by the stroke control mechanism to reduce the reciprocating stroke of the push plate, so that the wave amplitude decreases synchronously with the decrease in water level. The above-mentioned high tide and low tide cycle is repeated to realize the long-term simulation test of the alternating wet and dry erosion of ultra-high performance concrete. This device breaks through the limitation of existing devices that can only realize simple water level rise and fall and fixed wave amplitude. Through the adjustable length of the movable crank, the wave amplitude and tidal water level are adaptively matched, accurately reproducing the natural law of large high tide and small low tide in the nearshore tidal zone. 2. When it is necessary to extend the effective length of the movable crank, push the two bevel gear rings to move towards the corresponding internal threaded cylinders, so that the bevel gear ring closer to the internal threaded cylinder on that side meshes with the bevel gear on that side, and move the other bevel gear ring away from the other bevel gear. At this time, the first rotating column drives the sleeve and the internal threaded cylinder to rotate synchronously. Since the bevel gear rings are fixed and do not rotate, the bevel gear drives the internal threaded cylinder to rotate relative to the sleeve under the meshing action. The internal threaded cylinder drives the movable crank to extend outward through the threaded transmission. At the same time, the other internal threaded cylinder rotates synchronously with the internal threaded cylinder through the second transmission belt, driving the other movable crank to extend synchronously, realizing a uniform increase in the push plate stroke; when it is necessary to shorten... When the effective length of the short movable crank is reached, the two bevel gear rings are pushed to move to the other side, so that the bevel gear ring near the inner threaded cylinder on the other side meshes with the bevel gear on the inner threaded cylinder on the other side. At this time, the inner threaded cylinder rotates in the opposite direction, driving the two movable cranks to retract synchronously, thereby achieving a uniform reduction in the push plate stroke. Throughout the entire stroke, the first rotating column only needs to maintain unidirectional rotation, without the need to reverse the rotation to achieve the reverse movement of the movable crank. The stroke control mechanism, through the alternating meshing of the two bevel gear rings, realizes the switching of forward and reverse rotation of the inner threaded cylinder under the premise of unidirectional rotation of the first rotating column, thereby realizing the extension and retraction of the movable crank, completely avoiding the wave cancellation problem, and ensuring the continuity and regularity of wave generation. 3. When the intermittent control component drives the moving frame to block the inlet, the other side of the moving frame separates from the outlet, the outlet opens, and the test chamber begins to drain water to simulate low tide. At the same time, the moving frame drives two bevel gear rings to move synchronously through the bracket. One bevel gear ring separates from its corresponding bevel gear, and the other bevel gear ring meshes with its corresponding bevel gear. At this time, the internal threaded cylinder rotates, driving the movable crank to gradually retract, the push plate stroke gradually decreases, and the wave amplitude decreases synchronously with the low tide. When the intermittent control component drives the moving frame to separate from the inlet, the other side of the moving frame will block the outlet, the inlet opens, and the test chamber begins to add water to simulate high tide. At the same time, the moving frame drives two bevel gear rings to move synchronously in the opposite direction through the bracket. One bevel gear ring meshes with its corresponding bevel gear, and the other bevel gear ring separates from its corresponding bevel gear. At this time, the internal threaded cylinder rotates in the opposite direction, driving the movable crank to gradually extend, the push plate stroke gradually increases, and the wave amplitude increases synchronously with the high tide. It achieves synchronous linkage between inlet / outlet water control and wave amplitude control. It automatically switches the wave amplitude trend while the water level changes. A single movement of the moving frame can simultaneously switch the opening and closing of the inlet and outlet and the meshing of the conical gear ring, ensuring strict synchronization between wave amplitude changes and water level changes. 4. Utilizing the large reduction ratio of the worm gear transmission, the drive disc rotates only half a turn after the second rotating column has rotated multiple times, completing one switching between high and low tide. This means that during each high or low tide, the push plate can perform dozens to hundreds of reciprocating wave generation operations. The length of the movable crank changes slowly and continuously during this period, thereby achieving a gradual increase or decrease in wave amplitude. This replicates the natural law of wave amplitude slowly changing with water level during real tides. The half-section expansion design of the drive disc enables the intermittent reciprocating motion of the moving frame, keeping the moving frame 41 stable and stationary during non-switching phases, ensuring the continuity of water inflow / outflow and wave generation processes. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the three-dimensional structure of the test chamber in this invention; Figure 3 This is a cross-sectional view of the structural schematic diagram of the wave-generating mechanism and the stroke control mechanism in this invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a cross-sectional view of the structural schematic diagram of the water inlet / outlet control mechanism in this invention; Figure label: Test chamber 1, water inlet 11, water outlet 12, water tank 13, drainage tank 14, concrete sample 15, return water pipe 16, water pump 17, ring frame 18, fan 19. Wave-making mechanism 2, first rotating column 21, sleeve 211, connecting cavity 212, movable crank 22, rocker arm 23, push plate 24, flow port 241, drive assembly 25, second rotating column 251, motor 252, first transmission belt 253; Stroke control mechanism 3, internal threaded cylinder 31, bevel gear 311, bevel gear ring 32, bracket 321, second transmission belt 33; Water inlet / outlet control mechanism 4, moving frame 41, intermittent control component 42, worm gear 421, drive disc 422, expansion section 4221, turbine 423. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] like Figure 1-5 As shown in the figure, the ultra-high performance concrete tidal wet-dry alternating erosion simulation test device provided in this embodiment includes a test chamber 1, a wave-making mechanism 2, a stroke control mechanism 3, and an inlet / outlet water control mechanism 4.

[0021] The test chamber 1 is equipped with an inlet 11 and an outlet 12. The inlet 11 is connected to a water tank 13 via a pipe, and the outlet 12 is connected to a drain tank 14 via a pipe. Specifically, the water tank 13 and the drain tank 14 are fixed to both sides of the test chamber 1 by support frames. The installation height of the water tank 13 is higher than the highest water level line of the test chamber 1, and the installation height of the drain tank 14 is lower than the lowest water level line of the test chamber 1, so as to achieve gravity-driven water inflow and outflow. A concrete sample 15 is installed inside the test chamber 1. Specifically, a ring frame 18 is installed around the concrete sample 15 in the test chamber 1, and multiple fans 19 are installed around the ring frame 18. The air outlet of each fan 19 is facing the concrete sample 15, thereby realizing the salt spray drying function to simulate the coupled effect of multiple factors such as water level rise and fall, wave erosion, and salt spray drying, and to more realistically simulate the complex erosion environment of the tidal wet and dry alternation zone.

[0022] Furthermore, a return water pipe 16 is connected between the water tank 13 and the drainage tank 14. A water pump 17 is installed on the return water pipe 16. When the water level in the drainage tank 14 reaches the set height, the water pump 17 is started to pump the simulated seawater in the drainage tank 14 back to the water tank 13 through the return water pipe 16, thereby realizing the recycling of water resources, reducing water consumption during the experiment, and lowering the experiment cost.

[0023] The wave-making mechanism 2 includes a first rotating column 21, a movable crank 22, a rocker arm 23, a pusher plate 24, and a drive assembly 25. The pusher plate 24 is slidably installed in the test chamber 1 along the direction of approaching or moving away from the concrete sample 15. The side wall of the test chamber 1 is provided with a stroke groove, and the pusher plate is provided with movable pins that are slidably connected to the stroke groove on both sides. The first rotating column 21 is rotatably installed in the test chamber 1. A rotating seat is installed at the bottom of the inner cavity of the test chamber 1, and the first rotating column 21 is rotatably installed on the rotating seat. A sleeve 211 is provided on the first rotating column 21. The movable crank 22 is axially movable inside the sleeve 211. One end of the movable crank 22 is rotatably connected to one end of the rocker arm 23, and the other end of the rocker arm 23 is rotatably connected to the pusher plate 24. The first rotating column 21 can drive the movable crank 22 to rotate, and then drive the pusher plate 24 to move back and forth by swinging the rocker arm 23. The drive assembly 25 is used to drive the first rotating column 21 to rotate.

[0024] Preferably, an overflow port 241 is provided on the bottom side of the push plate 24 to avoid the water level on both sides of the push plate 24 being inconsistent during movement, thus ensuring the level and stability of the water level in the test chamber 1.

[0025] The stroke control mechanism 3 is used to drive the movable crank 22 to move.

[0026] The inlet and outlet water control mechanism 4 is used to open and close the inlet 11 and the outlet 12.

[0027] Before the experiment, the prepared ultra-high performance concrete sample 15 was fixed in the test chamber 1 at the end away from the wave-generating mechanism 2, and the prepared simulated seawater was injected into the water tank 13. The drive assembly 25 was started, driving the first rotating column 21 to rotate at a constant speed. The first rotating column 21 drove the movable crank 22 to make a circular motion through the sleeve 211. The movable crank 22 converted the circular motion into the horizontal reciprocating linear motion of the push plate 24 through the rocker arm 23. The push plate 24 pushed the water in the test chamber 1 to generate waves, which acted on the surface of the concrete sample 15. The inlet 11 is opened and the outlet 12 is closed by the inlet / outlet control mechanism 4, simulating a rising tide as the water level in test chamber 1 gradually increases. Simultaneously, the effective length of the movable crank 22 extending from the sleeve 211 is gradually extended by the stroke control mechanism 3, increasing the reciprocating stroke of the pusher plate 24, causing the wave amplitude to increase synchronously with the rising water level. When the water level reaches the set maximum value, the inlet 11 is closed and the outlet 12 is opened by the inlet / outlet control mechanism 4, simulating a receding tide as the water level in test chamber 1 gradually decreases. Simultaneously, the effective length of the movable crank 22 is gradually shortened by the stroke control mechanism 3, reducing the reciprocating stroke of the pusher plate 24, causing the wave amplitude to decrease synchronously with the receding water level. This rising and receding tide cycle is repeated to achieve a long-term simulation test of the alternating wet and dry erosion of ultra-high performance concrete. This device breaks through the limitations of existing devices that can only achieve simple water level rise and fall and fixed wave amplitude. Through the adjustable length of the movable crank 22, it achieves adaptive matching between wave amplitude and tidal water level, accurately reproducing the natural law of large waves during high tide and small waves during low tide in the nearshore tidal zone.

[0028] Specifically, the drive assembly 25 includes a second rotating column 251 and a motor 252. The second rotating column 251 is rotatably mounted inside the test chamber 1 and is connected to the first rotating column 21 via a first transmission belt 253. Synchronous pulleys are correspondingly mounted on the first rotating column 21 and the second rotating column 251. Of course, for more stable transmission, the first transmission belt 253 can be replaced with a chain. The motor 252 is mounted on the test chamber 1, and its output shaft is connected to the second rotating column 251.

[0029] In one embodiment, a sleeve 211 is provided at each end of the first rotating column 21, and a movable crank 22 and a rocker arm 23 are respectively installed. The two sets of movable cranks 22 and rocker arms 23 are symmetrically connected to both sides of the push plate 24 to ensure that the push plate 24 is subjected to uniform force. The stroke control mechanism 3 includes an internally threaded cylinder 31 and a bevel gear ring 32. The inner wall of the internally threaded cylinder 31 has an internal thread. The two internally threaded cylinders 31 have the same thread direction and are axially rotated and installed in two sleeves 211 respectively. A second transmission belt 33 is connected between the two internally threaded cylinders 31. The movable crank 22 has an external thread and is threaded into the internally threaded cylinder 31. A bevel gear 311 is provided on the outer wall of the internally threaded cylinder 31. The two bevel gear rings 32 are movably sleeved on the outside of the first rotating column 21 with the first rotating column 21 as the center, and can mesh with the bevel gear 311 on the same side. The tooth surfaces of the two bevel gear rings 32 face opposite directions and face the bevel gear 311 on the corresponding side respectively. The bevel gear rings 32 are slidably but non-rotatably installed in the test chamber 1 along the axial direction of the first rotating column 21. When it is necessary to extend the effective length of the movable crank 22, the two bevel gear rings 32 are pushed to move towards the corresponding internal threaded cylinder 31, so that the bevel gear ring 32 closer to the internal threaded cylinder 31 on that side meshes with the bevel gear 311 on that side of the internal threaded cylinder 31, and the other bevel gear ring 32 moves away from the other bevel gear 311. At this time, the first rotating column 21 drives the sleeve 211 and the internal threaded cylinder 31 to rotate synchronously. Since the bevel gear ring 32 is fixed and does not rotate, the bevel gear 311 drives the internal threaded cylinder 31 to rotate relative to the sleeve 211 under the meshing action. The internal threaded cylinder 31 drives the movable crank 22 through the threaded transmission. Crank 22 extends outward, while the internal threaded cylinder 31 on the other side rotates synchronously with it via the second transmission belt 33, causing the movable crank 22 on the other side to extend synchronously, thus uniformly increasing the stroke of push plate 24. When it is necessary to shorten the effective length of movable crank 22, the two bevel gear rings 32 are pushed to the other side, so that the bevel gear ring 32 near the internal threaded cylinder 31 on the other side meshes with the bevel gear 311 on the internal threaded cylinder 31. At this time, the internal threaded cylinder 31 rotates in the opposite direction, driving the two movable cranks 22 to retract synchronously, thus uniformly reducing the stroke of push plate 24. Throughout the entire stroke, the first rotating column 21 only needs to maintain unidirectional rotation, without the need to reverse the direction of movable crank 22. If a reverse direction is used, push plate 24 will move in the opposite direction instantaneously, colliding and canceling out the waves that have already been generated and are propagating forward, resulting in turbulent wave shape and irregular wave amplitude. The stroke control mechanism 3, through the alternating meshing of two bevel gear rings 32, achieves the switching of forward and reverse rotation of the internal threaded cylinder 31 under the premise of unidirectional rotation of the first rotating column 21, thereby realizing the extension and retraction of the movable crank 22, completely avoiding the wave cancellation problem and ensuring the continuity and regularity of wave generation.

[0030] Preferably, the first rotating column 21 has a connecting cavity 212, which communicates with the interiors of the two sleeves 211. The connecting cavity 212 is a cylindrical through hole opened along the axis of the first rotating column 21, and the diameter of the through hole is larger than the width of the second transmission belt 33, ensuring that the second transmission belt 33 has sufficient movement space. The second transmission belt 33 is located in the connecting cavity 212 and is fitted onto the two internally threaded cylinders 31. The inner ends of the two internally threaded cylinders 31 extend into the connecting cavity 212, and synchronous pulleys are installed on the inner ends. The second transmission belt 33 is fitted onto the two synchronous pulleys. This avoids contact between the second transmission belt 33 and the water and salt spray in the test chamber 1, preventing corrosion and aging of the transmission belt and extending its service life. At the same time, it avoids the second transmission belt 33 from rubbing against and interfering with other moving parts during rotation, improving the safety and reliability of the device operation.

[0031] Furthermore, the inlet 11 and outlet 12 are respectively located on both sides of the test chamber 1. The water inlet / outlet control mechanism 4 includes a moving frame 41 and an intermittent control component 42. The moving frame 41 is slidably installed in the test chamber 1 and its two sides can respectively abut against the inlet 11 and outlet 12. Rubber sealing gaskets are installed on both sides of the moving frame 41 to improve the sealing performance and prevent water leakage. Two bevel gear rings 32 are respectively installed on the moving frame 41 through brackets 321. When the moving frame 41 blocks the inlet 11 or outlet 12, one bevel gear ring 32 will mesh with the bevel gear 311 on the same side and the other bevel gear ring 32 will separate from the other bevel gear 311. The intermittent control component 42 is used to drive the moving frame 41 to move. When the intermittent control component 42 drives the moving frame 41 to block the inlet 11, the other side of the moving frame 41 separates from the outlet 12, the outlet 12 opens, and the test chamber 1 begins to drain water to simulate low tide. At the same time, the moving frame 41 drives two bevel gear rings 32 to move synchronously through the bracket 321. One bevel gear ring 32 separates from its corresponding bevel gear 311, and the other bevel gear ring 32 meshes with its corresponding bevel gear 311. At this time, the internal threaded cylinder 31 rotates, driving the movable crank 22 to gradually retract, the stroke of the push plate 24 gradually decreases, and the wave amplitude decreases synchronously with the low tide. When the control component 42 drives the moving frame 41 to separate from the inlet 11, the other side of the moving frame 41 will block the outlet 12, opening the inlet 11. The test chamber 1 begins to add water to simulate a high tide. At the same time, the moving frame 41 drives two bevel gear rings 32 to move synchronously in opposite directions via the bracket 321. One bevel gear ring 32 meshes with its corresponding bevel gear 311, while the other bevel gear ring 32 disengages from its corresponding bevel gear 311. At this time, the internal threaded cylinder 31 rotates in the opposite direction, driving the movable crank 22 to gradually extend, and the stroke of the push plate 24 gradually increases, causing the wave amplitude to increase synchronously with the high tide. This achieves synchronous linkage between water inlet / outlet control and wave amplitude control, automatically switching the wave amplitude trend while the water level changes. A single movement of the moving frame 41 can simultaneously complete the opening / closing switch of the inlet and outlet and the meshing switch of the bevel gear rings, ensuring strict synchronization between wave amplitude changes and water level changes.

[0032] Specifically, the intermittent control component 42 includes a worm gear 421 and a drive disk 422. The worm gear 421 is coaxially mounted on the second rotating column 251. The drive disk 422 is rotatably mounted inside the test chamber 1 and located inside the moving frame 41. A turbine 423 that meshes with the worm gear 421 is coaxially mounted on the drive disk 422. An enlarged diameter section 4221 is provided in the edge half of the drive disk 422. The arc size of the enlarged diameter section 4221 is larger than the arc size of the drive disk 422, and there is a smooth arc transition between the enlarged diameter section 4221 and the drive disk 422. It should be noted that more than half of the edge area of ​​the drive disk 422 is a standard arc surface, and the remaining area less than half a circumference is the enlarged diameter section 4221. This avoids the two ends of the enlarged diameter section 4221 from simultaneously abutting against the inner walls of both sides of the moving frame 41 and causing jamming. The enlarged diameter section 4221 can push one side of the moving frame 41 that passes through it to abut against the inner wall of the test chamber 1. The second rotating column 251 can drive the worm gear 421 to rotate synchronously. The worm gear 421 drives the drive disk 422 to rotate slowly through meshing transmission with the turbine 423. When the expanded diameter part 4221 rotates to contact one side wall of the moving frame 41, it pushes the moving frame 41 to complete the switching of the opening and closing of the inlet and outlet, and at the same time completes the switching of the bevel gear ring meshing state, entering the high tide stage or the low tide stage. Utilizing the large reduction ratio of the worm gear transmission, the drive disc 422 rotates only half a turn after the second rotating column 251 has rotated multiple times, completing one switching between high and low tide. This means that during each high or low tide, the push plate 24 can perform dozens to hundreds of reciprocating wave generation operations. The length of the movable crank 22 changes slowly and continuously during this period, thereby achieving a gradual increase or decrease in wave amplitude. This replicates the natural law of wave amplitude slowly changing with water level during real tides. The half-section expansion design of the drive disc 422 enables the intermittent reciprocating motion of the moving frame 41, keeping the moving frame 41 stable and stationary during non-switching phases, ensuring the continuity of water inflow / outflow and wave generation processes.

[0033] Preferably, the water inlet 11 is located at the top of one side of the test chamber 1 to ensure that the water in the water tank 13 can flow smoothly into the test chamber 1 by gravity, and the water outlet 12 is located at the bottom of the other side of the test chamber 1 to ensure that the water in the test chamber 1 can be completely drained without any residual water, accurately simulating the completely dry state after the tide recedes.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An ultra-high performance concrete tidal wetting-drying erosion simulation test device, characterized by, This includes the test chamber, wave-making mechanism, stroke control mechanism, and water inlet / outlet control mechanism; The test chamber is equipped with an inlet and an outlet. The inlet is connected to a water tank and the outlet is connected to a drainage tank. A concrete sample is installed inside the test chamber. The wave-making mechanism includes a first rotating column, a movable crank, a rocker arm, a pusher plate, and a drive assembly. The pusher plate is slidably installed in the test chamber along the direction of approaching or moving away from the concrete sample. The first rotating column is rotatably installed in the test chamber and is provided with a sleeve. The movable crank is axially movable inside the sleeve. One end of the movable crank is rotatably connected to one end of the rocker arm, and the other end of the rocker arm is rotatably connected to the pusher plate. The drive assembly is used to drive the first rotating column to rotate. The stroke control mechanism is used to drive the movable crank to move; The inlet and outlet water control mechanism is used to open and close the inlet and outlet water.

2. The tidal wetting-drying erosion simulation test device for ultra-high performance concrete according to claim 1, characterized in that, The drive assembly includes a second rotating column and a motor. The second rotating column is rotatably mounted inside the test chamber and is connected to the first rotating column via a first transmission belt. The motor is mounted on the test chamber and is connected to the second rotating column. 3.The tidal wetting-drying erosion simulation test device of ultra-high performance concrete according to claim 2, characterized in that, One sleeve is provided at each end of the first rotating column, and a movable crank and a rocker arm are respectively installed. The stroke control mechanism includes an internal threaded cylinder and a bevel gear ring. The two internal threaded cylinders are axially rotatably installed in the two sleeves. A second transmission belt is connected between the two internal threaded cylinders. The movable crank has an external thread and is threaded into the internal threaded cylinder. A bevel gear is provided on the outer wall of the internal threaded cylinder. The two bevel gear rings are movably sleeved on the outside of the first rotating column with the first rotating column as the center, and can mesh with the bevel gear on the same side. The bevel gear rings are slidably but non-rotatably installed in the test chamber along the axial direction of the first rotating column.

4. The tidal wetting-drying erosion simulation test device for ultra-high performance concrete according to claim 3, characterized in that, The first rotating column has a connecting cavity, which is connected to the interior of two sleeves respectively. The second transmission belt is located in the connecting cavity and is sleeved on the two internally threaded sleeves.

5. The tidal wetting-drying erosion simulation test device for ultra-high performance concrete according to claim 3, characterized in that, The inlet and outlet are respectively located on both sides of the test chamber. The water inlet and outlet control mechanism includes a moving frame and an intermittent control component. The moving frame is slidably installed inside the test chamber and its two sides can abut against the inlet and outlet respectively. The two bevel gear rings are respectively installed on the moving frame through brackets. When the moving frame blocks the inlet or outlet, one bevel gear ring will mesh with the bevel gear on the same side while the other bevel gear ring will disengage from the other bevel gear. The intermittent control component is used to drive the moving frame to move.

6. The ultra-high performance concrete tidal wet-dry alternating erosion simulation test device according to claim 5, characterized in that, The intermittent control assembly includes a worm gear and a drive disk. The worm gear is coaxially mounted on the second rotating column. The drive disk is rotatably mounted inside the test chamber and located inside the moving frame. A turbine gear that meshes with the worm gear is coaxially mounted on the drive disk. An enlarged diameter section is provided in the edge half of the drive disk. The enlarged diameter section can push one side of the moving frame it passes through to abut against the inner wall of the test chamber.

7. The tidal wetting-drying erosion simulation test device for ultra-high performance concrete according to claim 5, characterized in that, The water inlet is located at the top of one side of the test chamber, and the water outlet is located at the bottom of the other side of the test chamber. 8.The tidal wetting-drying erosion simulation test device of ultra-high performance concrete according to claim 1, wherein, An overflow port is provided on the bottom side of the push plate. 9.The tidal wetting-drying erosion simulation test device of ultra-high performance concrete according to claim 1, wherein, A return pipe is connected between the water tank and the drain tank, and a water pump is installed on the return pipe.

10. The ultra-high performance concrete tidal wet-dry alternating erosion simulation test device according to claim 1, characterized in that, The test bin is provided with a ring frame around the concrete sample, and a plurality of air blowers are installed around the ring frame, and the air outlets of the air blowers are opposite to the concrete sample.

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