Experimental apparatus and methods for studying the durability of concrete under the coupled effects of tides and waves

Abstract

This invention relates to an experimental apparatus and method for studying the durability of concrete under the coupled effects of tides and waves, belonging to the research field of key issues in the durability of concrete structures. It includes a novel automated simulation experimental apparatus for simulating the real marine erosion environment under the combined effects of tides, waves, and sea breezes; and a method for testing the durability of concrete in complex marine environments. This invention can be used to conduct experimental research on the durability of concrete in complex marine environments under the coupled effects of tides and waves. It realizes the simulation of complex marine environments under the combined effects of tidal cycles with wave periods measured in seconds and high-frequency wet-dry cycles of waves. Simultaneously, it significantly reduces the complexity of traditional tidal and splash cycle simulation devices, as well as the construction and maintenance costs of equipment. It features simple operation and ease of use.

Description

Technical Field

[0001] This invention belongs to the technical field of research on the durability of reinforced concrete structures, specifically relating to an experimental device and method for studying the durability of concrete under the coupled effects of tides and waves. Background Technology

[0002] Research on concrete durability in marine environments remains a global research hotspot. Currently, due to limitations in experimental equipment, most studies are conducted under single environmental conditions, simulating only a single tidal cycle or a single wave splash, and failing to simulate the more realistic and complex erosion environment of tidal-wave-splash coupling.

[0003] Furthermore, existing technologies often employ periodic spraying to simulate the wet-dry cycle environment under splashing conditions. To prevent pump overload damage from continuous starts, the pump's single start-stop interval should generally be greater than 0.5 hours. Since concrete durability studies typically require long-term testing (usually measured in months), when using spraying to simulate splashing, the wet-dry cycle period must be greater than 0.5 hours to avoid pump damage from frequent start-stops during testing. This differs significantly from the high-frequency wet-dry cycle environment under real splashing conditions (wave periods are typically measured in seconds). Considering such a large difference between the spraying cycle and the real wave cycle, reducing the spraying cycle by adjusting the pump's single start-stop interval is very difficult and uneconomical. Moreover, numerous studies by scholars both domestically and internationally have found that the wet-dry cycle mechanism has a significant impact on the chloride ion penetration resistance of concrete. Therefore, exploring a more realistic experimental method to simulate splashing conditions is of significant practical importance. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the existing technology uses periodic spraying to simulate the wet and dry cycle environment under the action of wave splashing, which has a large difference in the wet and dry cycle period and does not simulate the real environment well. Therefore, the present invention provides a test device and method for studying the durability of concrete under the coupled action of tides and waves.

[0005] To address the aforementioned problems, this invention provides a test apparatus for studying the durability of concrete under the coupled effects of tides and waves, comprising: a water storage tank and a corrosion test chamber, wherein the corrosion test chamber holds test specimens, and further comprising:

[0006] A tidal circulation control system, wherein the liquid inlet of the tidal circulation control system is connected to the interior of the water storage tank, and the liquid outlet of the tidal circulation control system extends into the corrosion test chamber.

[0007] It also includes a splash circulation control device comprising a water tank that rotates along an axis. During the rotation of the water tank, the water level drops to the water level line of the corrosion test chamber, scoops up the corrosion solution in the corrosion test chamber and stores water, and the water tank continues to rotate, using the inertia of motion to splash water onto the test specimen.

[0008] Preferably, the water tank includes a scooping end and a drain end, and the splash circulation control device further includes:

[0009] A water-lifting plate is installed at the drain end of the water tank. During the rotation of the water tank, it receives the water that is poured out of the water tank due to gravity and extends the direction of water flow.

[0010] A water delivery mechanism is installed between the water tank and the test specimen. The water delivery path is extended by the water-lifting plate. The far end of the water delivery mechanism corresponds to the test splash part of the test specimen. The water delivery path indirectly and repeatedly delivers water to the test splash part to simulate the high-frequency dry and wet cycle action under the action of waves.

[0011] Preferably, it also includes a water supply vehicle, on which the water tanks are evenly distributed. The water supply vehicle has a rotating shaft at its center, which is driven to rotate by an external drive component. The opening of the water tank is provided with an overflow prevention plate.

[0012] Preferably, the splash circulation control device further includes a floating mechanism, the floating mechanism comprising:

[0013] The bottom base is located at the bottom of the corrosion test chamber;

[0014] Connecting rods are vertically fixed to both ends of the bottom base;

[0015] Airbags, fitted onto connecting rods, adjacent airbags are connected via...

[0016] The bottom float plate is connected to form a floating platform. By adjusting the position and height of the airbag set on the connecting rod, the water supply truck and water delivery mechanism can float at the specified water depth in the corrosion test chamber.

[0017] Preferably, the tidal circulation control system includes a solenoid valve, an inlet / outlet pump, and a flow valve, wherein the water storage tank, solenoid valve, inlet / outlet pump, flow valve, and corrosion test chamber are connected sequentially via PVC pipes.

[0018] To address the aforementioned technical issues, this invention also provides a method for studying the durability of concrete under the aforementioned tidal and wave coupling effects, comprising the following steps:

[0019] a. Based on the environmental elements of tides, waves, wind and temperature under the pre-simulation environment, set the tidal range H1, tidal cycle period T1, wave height H2, wave period T2, wind speed C, duration t, frequency f and temperature T;

[0020] b. Based on the settings in step a, the control system can obtain / calculate the following parameters:

[0021] The rise and fall of the water level in the corrosion test chamber is the tidal range H1, and the time it takes for the water level in the corrosion test chamber to complete one rise and fall is the tidal cycle period T1.

[0022] The water supply mechanism in the splash circulation control device sets the wave height H2 by adjusting the height difference between its outlet and the water level line. The time required for the water supply truck to rotate one revolution is 1 / 4 of the wave period T2, where the frequency of the motor is f2 = 4 / T2.

[0023] c. The tidal circulation control system uses a PLC controller to control the flow valve based on the calculation results of step b and the real-time water level feedback from the water level sensor to achieve a slow increase or decrease in the water level in the corrosion test chamber.

[0024] d. Based on the result of step b, the splash circulation control device uses a motor to control the rotation of the water supply truck, and the operating frequency of the motor is set to f2;

[0025] e. The water supply truck and water delivery mechanism of the splash circulation control device are floated at a certain water level by the floating mechanism. Before the test begins, the size of the airbag of the floating mechanism is adjusted to adjust the relative position of the water supply truck and the water level line to ensure that the water tank can take enough test water.

[0026] f. The tidal circulation control system controls the temperature in the corrosion test chamber through a PLC controller based on the target temperature T in step a and the real-time temperature fed back by the sensor.

[0027] Preferably, based on the wind conditions in step a, the air circulation fan is periodically turned on and off by a PLC control system to accelerate the drying process of the test specimen.

[0028] The present invention has the following advantages:

[0029] This invention proposes an experimental device and method for studying the durability of concrete under the coupled action of tides and waves. It realizes the simulation of a high-frequency wet-dry cycle environment under the combined action of tides and waves with wave periods measured in seconds. It can be used to carry out durability test research on reinforced concrete in complex marine environments. At the same time, it significantly reduces the complexity of traditional tidal wave cycle simulation devices and the cost of equipment construction and maintenance. It has the characteristics of simple operation and convenient use in the test process. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the experimental device for studying the durability of concrete under the coupling effect of tides and waves as described in this invention.

[0032] Figure 2 This is a schematic diagram of the splash circulation control device described in this invention;

[0033] Figure label:

[0034] 1. Water storage tank; 2. Tidal circulation control system; 3. Solenoid valve; 4. Inlet and outlet pump; 5. Flow valve; 6. Corrosion test chamber; 7. Splash circulation control device; 8. Air circulation fan; 9. Floating mechanism; 9-1. Airbag; 9-2. Connecting rod; 9-3. Bottom float plate; 9-4. Bottom base; 10. Water supply vehicle; 10-1. Water tank; 10-2. Water lifting plate; 10-3. Drive shaft; 10-4. Drive chain; 10-5. Motor; 11. Water delivery mechanism; 12. Test specimen; 13. Specimen base; 14. Overflow prevention plate. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0036] Application Overview

[0037] In existing technologies, periodic spraying is often used to simulate the wet-dry cycle environment under wave splashing. However, due to the limitation of the pump's start-stop interval (usually greater than 0.5 hours), the simulated wet-dry cycle period using spraying is typically measured in hours (h), which differs significantly from the high-frequency wet-dry cycle environment under wave splashing (wave periods are typically measured in seconds).

[0038] The experimental device for studying the durability of concrete under the coupling effect of tides and waves in this embodiment can accurately simulate the complex marine environment under the coupling effect of tides and waves (where the wave period is measured in seconds), and solves the problem that existing experimental devices and methods cannot comprehensively study and analyze the durability of concrete under the coupling effect of tides and waves in complex marine environments.

[0039] The present invention will be further described below with reference to specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be construed as limiting the present invention to the following embodiments.

[0040] like Figures 1 to 2 As shown, an experimental device for studying the durability of concrete under the coupled action of tides and waves includes a water tank 1, a tidal circulation control system 2, a corrosion test chamber 6, and a splash circulation control device 7. The water tank 10-1, driven by the splash circulation control device 7, scoops up the corrosive solution from the corrosion test chamber 6 while rotating. During the subsequent rotation, the corrosive solution flows sequentially through the drain end of the water tank 10-1 and the water-lifting plate 10-2 at the drain end of the water tank 10-1 to extend the liquid delivery channel. During the rotation, the far end of the water-lifting plate 10-2 approaches the water delivery mechanism 11, contacts and further elastically squeezes the water delivery mechanism 11, and finally detaches from the water delivery mechanism 11 due to elastic deformation, completing the circulation and delivery of the corrosive solution. This simulates one wet-dry cycle of the test specimen 12 under the action of waves. By continuously driving the water tank 10-1 to rotate along the axis, the wet-dry cycle under the action of waves is realized.

[0041] Furthermore, in order to simulate the wet-dry cycle of waves, based on the characteristics of equal and continuous wet-drying time of concrete structures under wave action, it is necessary to meet the requirements that the drying time is equal to the wetting time and that the action is continuous. Therefore, the above-mentioned wave splash cycle control device 7 also includes a water supply vehicle 10. The purpose of setting up the water supply vehicle 10 is to provide a carrier for the installation of the water tanks 10-1. The water tanks 10-1 are evenly distributed on the water supply vehicle 10. Driving the water supply vehicle 10 to rotate can drive the water tanks 10-1 at different positions on it to simultaneously scoop, store, and transport the corrosive solution to the water delivery mechanism 11. At the same time, the evenly distributed water tanks 10-1, together with the uniformly rotating water supply vehicle 10, can scoop, store, and transport the corrosive solution in a continuous cycle, simulating the continuous wet-dry cycle of waves.

[0042] In this embodiment, the water supply vehicle 10 is divided into 8 equal parts, and the water tanks 10-1 are evenly spaced to achieve intermittent periodic water supply, thereby simulating the dry and wet cycle under the action of waves; the water lifting plate 10-2 can lift water to the water delivery mechanism 11. The outer edge of the water lifting plate 10-2 needs to extend beyond the inner edge of the water delivery mechanism 11. In order to ensure that the water lifting plate 10-2 can pass through the water delivery mechanism 11 smoothly by deforming when it comes into contact with the water delivery mechanism 11, it is recommended that the water lifting plate 10-2 be made of rubber.

[0043] Furthermore, such as Figure 1It is known that the lower part of the water supply truck 10 is immersed in the corrosive solution of the corrosion test chamber 6. During the rotation of the water supply truck 10, it needs to overcome the resistance of the corrosive solution and the increase in gravity caused by the water tank 10-1. Therefore, in this design, the drive shaft 10-3, the drive chain 10-4, and the motor 10-5 are designed as the drive mechanism to provide driving force for the water supply truck 10. The drive shaft 10-3 is installed at the center of the water supply truck 10. One end of the drive chain 10-4 is fitted onto the drive shaft 10-3, and the other end is installed on the drive end of the motor 10-5, which drives the water supply truck 10-5. The shaft height is slightly higher than the height of the drive shaft 10-3 on the water supply vehicle 10. The reason for this setting is that when the water tank 10-1 is immersed in the corrosive solution and stores water during the rotation of the water supply vehicle 10, the overall weight of the water supply vehicle 10 increases. The drive shaft 10-3 is integrated with the water supply vehicle 10, so the drive shaft 10-3 has a downward movement tendency. In the water storage state, the position of the drive shaft 10-3 decreases, and the transmission chain 10-4 remains taut. This not only allows for normal transmission connection but also increases the friction with the drive shaft 10-3, improving work efficiency.

[0044] Furthermore, the water tank 10-1 is provided with an opening, one end of which is a drain end and the other end is a scooping end. As the corrosive solution inside the water tank 10-1 changes during the overall rotation of the water supply vehicle 10, according to the requirements of the simulated wave wet-dry cycle, the speed, total liquid volume, and splash position of the corrosive solution splashed onto the test specimen 12 meet the requirements of quantitative circulation. Due to the design requirements of the water tank 10-1 being embedded in the water supply vehicle 10, during the process of the water tank 10-1 entering the corrosive solution and rotating and being lifted away from the corrosive solution, the opening of the water tank 10-1 is in an inverted state for a certain period of time. During the rotation, the corrosive solution scooped into the water tank 10-1 from the scooping end of the opening will overflow back into the corrosion test chamber 6 according to the flow characteristics, resulting in insufficient water storage or different water storage in each water tank 10-1. At this time, an overflow prevention plate 14 is installed at the water-scooping end of the opening. The height of the far end of the overflow prevention plate 14 relative to the bottom surface of the corrosion test chamber 6 is slightly higher than the height of the water-scooping end of the opening relative to the bottom surface of the corrosion test chamber 6. During the process of the water tank 10-1 rising, the angle between the surface of the overflow prevention plate 14 and the bottom surface of the corrosion test chamber 6 gradually increases until the surface of the water-scooping end of the opening is parallel to the bottom surface of the corrosion test chamber 6, and the corrosive solution in the water tank 10-1 no longer has the tendency to overflow.

[0045] Compared to reducing the area of ​​the opening, adding the overflow prevention plate 14 has the following advantages:

[0046] 1. If the opening area is reduced to prevent or reduce the backflow of corrosive solution liquid, during the scooping process, under the same rotation speed, the opening area determines the amount of liquid entering the water tank 10-1 within a fixed time. Adding the overflow plate 14 can increase the amount of liquid remaining in the water tank 10-1 without reducing the opening size.

[0047] 2. Driven by the rotation of the water tank 10-1, the overflow plate 14 moves within the corrosive solution, causing the corrosive solution in the corrosion test chamber 6 to have a certain fluidity. The corrosive solution collides with the inner wall of the corrosion test chamber 6. According to the principle of action and reaction, the propelled corrosive solution hits the side wall of the corrosion test chamber 6 and is rebounded. The speed of entering the opening in the relatively static state is accelerated, and the amount of corrosive solution entering the opening per unit time increases. In the operation of circulating splashing, the amount of corrosive solution splashed into the designated area is guaranteed.

[0048] Furthermore, the wave-splash circulation control device 7 also includes a floating mechanism 9, which is a key device for coupling the effects of tides and waves, such as... Figure 2 AA refers to the liquid level of the corrosion test chamber 6 containing the corrosive solution. The floating mechanism 9 includes: a base 9-4 at the bottom of the corrosion test chamber 6, connecting rods 9-2 vertically fixed at both ends of the base 9-4, and airbags 9-1 mounted on the connecting rods 9-2. Adjacent airbags 9-1 are connected by a bottom float plate 9-3 to form a floating platform. By adjusting the height of the airbags 9-1 mounted on the connecting rods 9-2, the water supply truck 10 and the water delivery mechanism 11 float at the designated water depth in the corrosion test chamber 6. While the tidal circulation control system 2 controls the rise and fall of the water level AA, the floating mechanism 9 allows the splash circulation control device to rise and fall with the water level, thereby simulating the variable frequency dry and wet cycle process under the coupling effect of tides and waves.

[0049] It should be further noted that the bottom float 9-3 cooperates with the airbag 9-1 mounted on the connecting rod 9-2. The height of the airbag 9-1 mounted on the connecting rod 9-2 is adjusted to adapt to the position of the bottom float 9-3 in the corrosive solution of the corrosion test chamber 6. The design requirements for the position of the bottom float 9-3 meet the following points:

[0050] 1. For example Figure 2 As shown, the water tank 10-1 at the bottom of the water supply truck 10 should be completely submerged below the surface A of the corrosive solution. At the same time, the height of the rotating shaft 10-3 integrated on the water supply truck 10 is slightly lower than the height of the drive shaft of the motor 10-5 set on the same plane as the bottom float plate 9-3.

[0051] 2. Before the test begins, adjust the size of the airbag 9-1 of the floating mechanism 9 to adjust the relative position of the water supply truck 10 and the water level line. When adjusting, make sure that the water tank 10-1 of the water supply truck 10 can take enough corrosive solution for the test.

[0052] Furthermore, a water delivery mechanism 11 is provided between the water tank 10-1 and the test specimen 12. The water delivery path is extended by the water lifting plate 10-2. The far end of the water delivery mechanism 11 corresponds to the test splash part of the test specimen 12. The water delivery path indirectly and repeatedly delivers water to the test splash part to simulate the high-frequency dry and wet cycle action under the action of waves.

[0053] The corrosion test chamber 6 is equipped with an air circulation fan 8, a temperature sensor, and an anemometer. The data collected by the temperature sensor and anemometer are transmitted to the control system in real time. The bottom of the corrosion test chamber 6 includes a drain valve, from which wastewater can be discharged after the test.

[0054] Furthermore, the tidal circulation control system 2, which is connected to the interior of the corrosion test chamber 6, includes:

[0055] The inlet pipe and outlet pipe are connected. The inlet end of the inlet pipe is connected to the lower side wall of the water storage tank 1, and the outlet end of the inlet pipe enters the chamber from the upper part of the corrosion test chamber 6 and bends to extend to the bottom of the corrosion test chamber 6. The inlet end of the outlet pipe is connected to the lower side wall of the corrosion test chamber 6, and the outlet end of the outlet pipe enters the chamber from the upper part of the water storage tank 1 and bends to extend to the bottom of the water storage tank 1. During the test, the liquid level in the water storage tank 1 and the liquid level in the corrosion test chamber 6 alternately and slowly rise or slowly fall.

[0056] Furthermore, the inlet and outlet pipes are equipped with inlet and outlet pumps 4, with one pump on the inlet pipe and the other on the outlet pipe. The water level in the corrosion test chamber is slowly raised and lowered by controlling the flow difference between the two pumps. The water inlet or outlet is controlled by independent solenoid valves 3 on the inlet and outlet pipes, respectively. The water inlet or outlet flow rate is controlled by independent flow valves 5 on the inlet and outlet pipes, respectively.

[0057] It should be noted that the water storage tank 1, the tidal circulation control system 2, and the corrosion test chamber 6 are connected by rust-proof pipes to extend their service life.

[0058] The tidal circulation control system 2 includes a solenoid valve 3, an inlet / outlet pump group 4, a flow valve 5, an air circulation fan 8, a PVC pipe, and a temperature sensor. The inlet / outlet pump group 4 consists of two pumps. By controlling the flow difference between the two pumps, the water level in the corrosion test chamber is controlled to rise and fall slowly. The water storage tank 1, solenoid valve 3, inlet / outlet pump group 4, flow valve 5, and corrosion test chamber 6 are connected in sequence through PVC pipes.

[0059] A test method for studying the durability of concrete under the coupled effects of tides and waves based on the above-mentioned test device includes the following steps:

[0060] a. According to the test requirements, several test specimens 12 are prepared and placed on the specimen base 13. The water storage tank 1 is pre-prepared with the corrosive solution required for the test.

[0061] b. Based on environmental factors such as tides, waves, wind, and temperature under the pre-simulation environment, set the tidal range H1, tidal cycle period T1, wave height H2, wave period T2, wind speed C, duration t, frequency f, and temperature T.

[0062] c. Based on the settings in step a, the control system can obtain / calculate the following parameters:

[0063] The rise and fall of the water level in the corrosion test chamber 6 is the tidal range H1, and the time it takes for the water level in the corrosion test chamber 6 to complete one rise and fall is the tidal cycle period T1.

[0064] The water supply vehicle 10 and water delivery device 11 of the splash circulation control device 7 are floated at a certain water level by the floating mechanism 9. Before the test begins, the relative position of the water supply vehicle 10 and the water level line is adjusted by adjusting the size of the air bag 9-1 of the floating mechanism 9. When adjusting, care should be taken to ensure that the water tank 10-1 of the water supply vehicle 10 can take enough test water.

[0065] The water supply device 11 in the splash circulation control device 7 sets the wave height H2 by adjusting the height difference between its outlet and the water level line. The time required for the water supply truck 10 to rotate one revolution is 1 / 4 of the wave period T2, where the frequency of the motor 10-5 is f2 = 4 / T2.

[0066] d. The tidal circulation control system 2 uses a PLC controller to control the flow valve 5 to slowly raise or lower the water level in the corrosion test chamber 6 based on the calculation results of step b and the real-time water level feedback from the water level sensor.

[0067] e. According to the result of step b, the splash circulation control device 7 uses motor 10-5 to control the rotation of water supply vehicle 10, and the working frequency of motor 10-5 is set to f2.

[0068] f. The tidal circulation control system 2 controls the temperature in the corrosion test chamber 6 through a PLC controller based on the target temperature T in step a and the real-time temperature fed back by the sensor; and controls the air circulation fan 8 to periodically start and stop according to the wind conditions in step a through the PLC control system to accelerate the drying process of the test specimen 12.

[0069] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A test apparatus for studying the durability of concrete under the coupled effects of tides and waves, comprising a water storage tank (1) and a corrosion test chamber (6), wherein test specimens (12) are placed inside the corrosion test chamber (6), characterized in that, Also includes: Tidal circulation control system (2), the liquid inlet of the tidal circulation control system (2) is connected to the interior of the water storage tank (1), and the liquid outlet of the tidal circulation control system (2) extends into the corrosion test chamber (6); The splash circulation control device (7) includes a water tank (10-1), which rotates along an axis. During the rotation of the water tank (10-1), it descends to the water level line of the corrosion test chamber (6), scoops up the corrosion solution in the corrosion test chamber (6) and stores water. The water tank (10-1) continues to rotate, and splashes water onto the test specimen (12) by using the inertia of motion.

2. The experimental device for studying the durability of concrete under the coupled effects of tides and waves according to claim 1, characterized in that: Tidal circulation control system (2). The tidal circulation control system (2) includes a solenoid valve (3), an inlet and outlet pump group (4), a flow valve (5), an air circulation fan (8), a PVC pipe, and a temperature sensor. The inlet and outlet pump group (4) consists of two water pumps. The water storage tank (1), solenoid valve (3), inlet and outlet pump group (4), flow valve (5), and corrosion test chamber (6) are connected in sequence through PVC pipes.

3. The experimental apparatus for studying the durability of concrete under the coupled effects of tides and waves according to claim 1, characterized in that, The water tank (10-1) includes a scooping end and a drain end, and the splash circulation control device (7) further includes: The water-lifting plate (10-2) is located at the drain end of the water tank (10-1). During the rotation of the water tank (10-1), it receives the water that is poured out of the water tank (10-1) due to gravity and extends the direction of water flow. A water delivery mechanism (11) is set between the water tank (10-1) and the test specimen (12). The water delivery path is extended by the water lifting plate (10-2). The far end of the water delivery mechanism (11) corresponds to the test splash part of the test specimen (12). The water delivery path indirectly and repeatedly delivers water to the test splash part to simulate the high-frequency dry and wet cycle action under the action of waves.

4. The experimental apparatus for studying the durability of concrete under the coupled effects of tides and waves according to claim 3, characterized in that, It also includes a water supply vehicle (10), on which water tanks (10-1) are evenly distributed. A rotating shaft (10-3) is provided at the center of the water supply vehicle (10), and the rotating shaft (10-3) is driven to rotate by an external driving component. An overflow prevention plate (14) is provided at the opening of the water tank (10-1).

5. The experimental apparatus for studying the durability of concrete under the coupled effects of tides and waves according to claim 1, characterized in that, The splash circulation control device (7) further includes a floating mechanism (9), which includes: The bottom base (9-4) is located at the bottom of the corrosion test chamber (6); The connecting rod (9-2) is vertically fixed to both ends of the bottom base (9-4); An airbag (9-1) is fitted onto a connecting rod (9-2). Adjacent airbags (9-1) are connected by a bottom float plate (9-3) to form a floating platform. By adjusting the position and height of the airbag (9-1) fitted onto the connecting rod (9-2), the water supply truck (10) and the water delivery mechanism (11) float at the specified water depth in the corrosion test chamber (6).

6. The experimental apparatus for studying the durability of concrete under the coupled effects of tides and waves according to any one of claims 1 to 5, characterized in that, The tidal circulation control system (2) includes a solenoid valve (3), an inlet and outlet pump (4), and a flow valve (5). The water storage tank (1), solenoid valve (3), inlet and outlet pump (4), flow valve (5), and corrosion test chamber (6) are connected in sequence by PVC pipes.

7. A method for studying the durability of concrete under the coupled effects of tides and waves as described in claim 6, characterized in that, Includes the following steps: a. Based on the environmental elements of tides, waves, wind and temperature under the pre-simulation environment, set the tidal range H1, tidal cycle period T1, wave height H2, wave period T2, wind speed C, duration t, frequency f and temperature T; b. Based on the settings in step a, the control system can obtain / calculate the following parameters: The rise and fall of the water level in the corrosion test chamber (6) is the tidal range H1, and the time it takes for the water level in the corrosion test chamber (6) to complete one rise and fall is the tidal cycle T1. The water delivery mechanism (11) in the splash circulation control device (7) sets the wave height H2 by adjusting the height difference between its outlet and the water level line. The water supply truck (10) rotates for 1 / 4 of the time required for one revolution, that is, the period is the wave period T2, where the frequency f2 of the motor (10-5) is 4 / T2. c. The tidal circulation control system (2) uses a PLC controller to control the flow valve (5) to achieve a slow increase or decrease in the water level in the corrosion test chamber (6) based on the calculation results of step b and the real-time water level fed back by the water level sensor. d. The splash circulation control device (7) uses a motor (10-5) to control the rotation of the water supply truck (10) according to the result of step b. The working frequency of the motor (10-5) is set to f2. e. The water supply vehicle (10) and water delivery mechanism (11) of the splash circulation control device (7) are floated at a certain water level by the floating mechanism (9). Before the test begins, the size of the airbag (9-1) of the floating mechanism (9) is adjusted to adjust the relative position of the water supply vehicle (10) and the water level line to ensure that the water tank (10-1) can take enough test water. f. The tidal circulation control system (2) controls the temperature in the corrosion test chamber (6) through a PLC controller based on the target temperature T in step a and the real-time temperature fed back by the sensor.

8. The experimental method for studying the durability of concrete under the coupled effects of tides and waves according to claim 7, characterized in that: Based on the wind conditions in step a, the air circulation fan (8) is periodically turned on and off by the PLC control system to accelerate the drying process of the test specimen (12).

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