Concrete durability coupling experiment device suitable for marine environment condition

Abstract

The invention discloses a concrete durability coupling experiment device suitable for marine environment conditions. The concrete durability coupling experiment device comprises a test box body assembly, a water return box body, an execution mechanism and a control system, the experiment box body assembly is of a split-mounted sealing structure, and liquid for simulating seawater and a concrete test piece to be subjected to a durability test are placed in the experiment box body assembly; the water return box body is connected with the interior of the test box body assembly through a pipeline, and simulation of the marine environment is achieved through an execution mechanism and a control system. Compared with the prior art, the whole experimental device is linked by adopting the control system and the execution mechanism, so that a closed-loop control system in which all parts work cooperatively is formed, and more accurate multi-element environment coupled marine environment simulation can be generated in the test box body; a reliable indoor coupling environment test means is provided for verifying ocean corrosion behaviors, structural stability, durability and the like of ocean engineering structures, coastal buildings, infrastructures and the like.

Description

Technical Field

[0001] The invention relates to the field of marine multi-type environment coupling tests, and in particular to a concrete durability coupling test device suitable for use under marine environmental conditions. Background Art

[0002] In recent decades, the scale of development and utilization of marine resources has continued to grow, and marine concrete technology has also been improved accordingly, including the exploitation of oil, natural gas and other minerals at sea, the construction of industrial zones along the coast, transportation, cross-sea bridges, tunnels, island and reef engineering, etc. All of these projects are mainly constructed with concrete. However, the marine environment is complex and changeable. Environmental factors such as high temperature, high humidity, high salt, high radiation, wind, waves, currents, and tides directly act on concrete structures, affecting the durability and reliability of engineering structures.

[0003] Therefore, in the process of evaluating marine engineering structures serving in marine environments, indoor physical simulation tests are one of the important research methods. By building indoor marine environment test simulation devices, the marine corrosion behavior, structural stability and durability of marine engineering structures, coastal buildings and infrastructure can be verified, so as to realize the real data collection of marine corrosion and durability and the comprehensive impact analysis of corrosion on structures and components, etc., to provide theoretical support for the design, material selection and anti-corrosion technology development of marine facilities and equipment.

[0004] Most of the existing indoor test devices that simulate marine environments are single-dimensional environmental simulations, such as single temperature simulation, single humidity simulation, etc. These environmental simulations lack the ability to couple the various harsh environmental characteristics of the ocean, and cannot guarantee the accuracy of the durability of marine concrete structures, and also reduce the credibility of the test results. Summary of the invention

[0005] In view of the shortcomings of existing marine harsh environment simulation test devices, the present invention provides a concrete durability coupling test device suitable for marine environmental conditions, which is used for coupled indoor tests for durability evaluation of marine engineering concrete structures, and significantly improves the authenticity and rationality of the coupling experiments.

[0006] The invention relates to a concrete durability coupling experimental device suitable for use under marine environmental conditions, comprising a test box assembly, a return water box, an actuator and a control system; the test box assembly is a separately installed sealing structure, in which liquid simulating seawater and concrete specimens to be subjected to durability tests are placed; the return water box is connected to the inside of the test box assembly through a pipeline, and the simulation of the marine environment is achieved through the actuator and the control system.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: the concrete durability coupling experimental device disclosed in the present invention is suitable for use under marine environmental conditions, adopts a heating pump to control water temperature, a wave-making pump to control surge size, a spray device to control humidity, a peristaltic pump, a solenoid valve, etc. to control simulated tides, and adopts a control system and an actuator to link the entire experimental device to form a closed-loop control system in which each part works in coordination, which can generate a more accurate multi-environment coupled marine environment simulation in the test box, and provides a reliable indoor coupled environmental test means for verifying the marine corrosion behavior, structural stability and durability of marine engineering structures, coastal buildings and infrastructure, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 The invention relates to a concrete durability coupling experimental device suitable for use in marine environmental conditions.

[0009] Description of the markings in the figure:

[0010] 1-working platform, 2-test chamber, 3-wedge-shaped cover, 4-spraying equipment, 5-wave pump, 6-heating rod, 7-control system, 8-water inlet, 9-water outlet, 10-water inlet pipe, 11-peristaltic pump, 12-electromagnetic flowmeter, 13-solenoid valve, 14-water outlet pipe, 15-return water chamber. DETAILED DESCRIPTION

[0011] The technical solution of the present invention is further described in conjunction with the accompanying drawings. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in the field or the product instructions shall be followed.

[0012] like Figure 1 As shown, the present invention involves a concrete durability coupling experimental device suitable for marine environmental conditions, the experimental device includes a test box assembly, a return water box 15, an actuator and a control system 7; the control system 7 is arranged on the outer wall of the test box 2 and connected to the actuator, the actuator is arranged inside the test box 2, and the control system 7 controls the operation of the actuator according to the experimental requirements.

[0013] The test box assembly includes a test box 2 and a wedge-shaped cover 3; the test box 2 is placed on the working platform 1, and the top of the test box 2 is fixedly installed with a wedge-shaped cover 3, which can be closed with the test box 2 to form a closed space. During the test, the interior of the test box 2 is filled with a certain amount of liquid.

[0014] The test box 2 is made of thickened fiberglass (2CM thick), and the wedge-shaped cover 3 is made of transparent acrylic. The transparent wedge-shaped cover 3 facilitates observation of the experimental state in the rectangular test water tank from the top.

[0015] The test box 2 is a rectangular parallelepiped; liquid with any solute concentration can be manually configured in the test box 2.

[0016] The test box 2 is provided with a water inlet 8 on the upper part of the side wall, and a water outlet 9 on the lower part; the water inlet 8 is connected to the water inlet pipe 10, the middle part of the water inlet pipe 10 is connected to the peristaltic pump 11, and the end of the water inlet pipe 10 is inserted into the bottom of the return water box 15; the water outlet 9 is connected to the water outlet pipe 14, the middle part of the water outlet pipe 14 is connected to the electromagnetic flowmeter 12 and the solenoid valve 13 in sequence, and the end of the water outlet pipe 14 is inserted into the bottom of the return water box 15.

[0017] The water inlet pipe 10 and the water outlet pipe 14 connected to the side wall of the test box 2 are both sealed pipes. The water inlet pipe 10 and the water outlet pipe 14 are both segmented pipe structures, which makes it convenient for the water inlet pipe 10 and the water outlet pipe 14 to be connected to the devices in the corresponding actuators respectively; the connection between the water inlet pipe 10 and the water outlet pipe 14 is connected by bolts through a flange, and the sealing material is filled at the connection.

[0018] The return water tank 15 is made of ordinary fiberglass, and the top of the return water tank 15 is located at the lower part of the working platform 1, that is, the top plane of the return water tank 15 is lower than the bottom surface of the test tank 2. The solution contained inside has the same properties as the solution in the test tank 2. The function of the return water tank 15 is to exchange the solution with the test tank 2 regularly and timed.

[0019] The actuator includes a wave pump 5, a heating rod 6, a sprinkler head 4 and a tidal simulation component; the tidal simulation component includes: a peristaltic pump 11, an electromagnetic control valve 13, and an electromagnetic flowmeter 12;

[0020] The wave pump 5 is used to simulate the sea waves in the test. The wave pump 5 is adsorbed and installed on one side of the shorter side wall of the experimental box 2. The adsorption position of the wave pump 5 can be freely adjusted in the side wall according to the needs. The wave power head in the wave pump 5 can be adjusted by 180° circular rotation to generate waves in different directions. The control system 7 can control the gear position of the wave pump 5 to generate waves of different sizes.

[0021] The heating rod 6 is side-lying and used to simulate the change of seawater temperature. The heating rod 6 is respectively installed at the bottom of the two long side walls of the experimental box 2, and is fixed by placing foam bricks at the bottom to ensure that the test solution completely submerges the heating rod 6. The temperature of the heated solution can be controlled by setting a control system 7, and the set temperature can be kept constant. The temperature control range is from room temperature to 80°C;

[0022] The spray head 4 is used to simulate the humidity above the sea surface; it is fixed below the transparent acrylic wedge-shaped cover 3, and the humidity value is set. The water spraying state of the spray head 4 in the box is controlled by the control system 7, and the humidity control range is 30%-100%.

[0023] The peristaltic pump 11 is installed on the working platform 1 and fixed to the platform by bolts. The opening time of the peristaltic pump 11 is set, and the liquid in the return water tank 15 slowly enters the test tank 2 through the water inlet pipe 10 until the peristaltic pump 11 stops entering the test tank 2 at the closing time set. At this time, the water level of the test tank 2 gradually rises.

[0024] The solenoid valve 13 and the electromagnetic flowmeter 12 are both installed on the working platform 1 and fixed to the working platform 1 by bolts. By setting the timing converter switch on the solenoid valve 13 to control the opening or closing of the solenoid valve 13, the liquid in the test box 2 flows out to the return water box by the deadweight generated by the height difference, and the electromagnetic flowmeter 12 feedback controls the solenoid valve 13 to reduce the water level in the test box 2.

[0025] The peristaltic pump 11, the electromagnetic valve 13 and the electromagnetic flowmeter 12 work together to achieve a regular rise or fall of the water level inside the test box 2, thereby simulating a tidal process.

[0026] The control system 7 includes a computer and a temperature controller, a humidity controller, a wave pump controller, and a tidal simulation controller, which respectively control the temperature, humidity, surge size, and tidal parameters in the test box.

[0027] The tidal simulation controller is used to coordinately control the peristaltic pump 11, electromagnetic flowmeter 12 and electromagnetic valve 13 in the tidal simulation component, thereby simulating different tidal conditions. Various controllers are integrated and connected to the control computer. After the control computer receives the data input by the test plan, the actuator will automatically adjust the corresponding parameters to control the operation of the actuator.

[0028] In the coupled experiment of concrete durability under simulated marine environment conditions, the concrete specimen to be subjected to the durability test is placed in the test box 2, and the wedge-shaped cover 3 is installed, and then closed with the test box 2 to form a closed space; first, the prepared solution with the same solute is added to the specified scales of the test box 2 and the return water box 15 respectively. The liquid temperature value in the test box 2 is set by the control system 7 in the computer to control the operation of the heating rod 6, and when the temperature reaches the required temperature; the gear parameters of the wave pump 5 are set according to the experimental requirements, the speed and direction of the wave motor of the actuator are determined, and the wave making equipment is started. At the same time, the humidity range inside the test box is set to control the opening and closing of the spraying equipment 4. In addition, for tidal simulation, the working time of the peristaltic pump 11 is set so that the liquid in the return tank 15 slowly flows into the test tank 2 to raise the water level. The switch of the timing converter in the solenoid valve 13 is set according to the electromagnetic flowmeter 12 to control the opening and closing of the solenoid valve. At this time, the liquid in the test tank 2 will flow back into the return tank 15 by its own weight to lower the water level.

[0029] During the test, the parameters are adjusted according to the coupling test parameter requirements, and the actuators will automatically implement the test device parameters in the instructions of the control system 7. All actuators work together under the control of the control system 7 to form a complete closed-loop control system, which improves the accuracy of coupled simulation of ocean high temperature, high humidity, high salinity, surge and tide environments.

[0030] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A concrete durability coupling test device suitable for use in marine environmental conditions, characterized in that: The concrete durability coupling experimental device can simulate ocean temperature, humidity, wave size, and tide, and comprises a test box assembly, a return water box (15), an actuator, and a control system (7); the test box assembly is a sealed structure installed in a split manner, and liquid simulating seawater and a concrete specimen to be subjected to a durability test are placed inside; the return water box (15) is connected to the inside of the test box assembly through a pipeline, and the simulation of the ocean environment is achieved through the actuator and the control system (7).

2. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 1 is characterized in that: The test box assembly comprises a test box (2) and a wedge-shaped cover (3); the test box (2) is placed on a working platform (1), the top of the test box (2) is fixedly mounted with a wedge-shaped cover (3), the wedge-shaped cover (3) and the test box (2) are closed to form a closed space, and the interior of the test box (2) is filled with liquid.

3. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 1 is characterized in that: The actuator comprises a wave-making pump (5), a heating rod (6), a spray head (4) and a tidal simulation component; the wave-making pump (5), the heating rod (6) and the spray head (4) are installed in a test box component; the tidal simulation component is installed on a pipeline between a return water box (15) and the test box component; the wave-making pump (5) is used to simulate sea waves in the test, the heating rod (6) is used to simulate changes in seawater temperature; the spray head (4) is used to simulate the humidity above the sea surface, and the tidal simulation component is used to simulate the tidal environment of seawater.

4. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 2 is characterized in that: The tidal simulation component comprises: a peristaltic pump (11), an electromagnetic control valve (13), and an electromagnetic flowmeter (12); the peristaltic pump (11) is used to provide power for liquid to enter the test box component from the return water box (15); the electromagnetic control valve (13) and the electromagnetic flowmeter (12) are used to realize the liquid to enter the return water box (15) from the test box component in combination with gravity.

5. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 4 is characterized in that: The upper part of the side wall of the test box assembly is provided with a water inlet (8), and the lower part is provided with a water outlet (9); the water inlet (8) is connected to a water inlet pipe (10), the middle part of the water inlet pipe (10) is connected to a peristaltic pump (11), and the end of the water inlet pipe (10) is inserted into the bottom of a return water box (15); the water outlet (9) is connected to a water outlet pipe (14), the middle part of the water outlet pipe (14) is connected to an electromagnetic flowmeter (12) and an electromagnetic valve (13) in sequence, and the end of the water outlet pipe (14) is inserted into the bottom of the return water box (15).

6. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 1 is characterized in that: The control system (7) comprises a computer and a temperature controller, a humidity controller, a wave pump controller and a tide simulation controller, which respectively control the temperature, humidity, wave size and tide parameters in the test box.

7. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 1 is characterized in that: The test box (2) is made of glass fiber reinforced plastic, and the wedge-shaped cover (3) is made of transparent acrylic.

8. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 1 is characterized in that: The top plane of the return water tank (15) is lower than the bottom surface of the return water tank assembly. When liquid enters the return water tank (15) from the return water tank assembly, it needs to flow out to the return water tank (15) by its own weight due to the height difference.

9. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 3 is characterized in that: The wave-making power head in the wave-making pump (5) is rotatably adjusted by (180) degrees to generate waves in different directions.

10. The concrete durability coupling experimental device suitable for marine environment conditions according to claim 3 is characterized in that: The heating rods (6) are respectively installed at the bottom of the two long side walls of the experimental box (2) and fixed by placing foam bricks at the bottom.

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