Device and method for testing durability of energy underground structure under temperature and ion coupling effect
By designing a durability test device for energy underground structures under temperature and ion coupling, the challenge of the problem of difficulty in studying the durability of energy underground structures in the prior art is solved, and efficient research and safety detection of the deterioration process of the full life cycle of energy underground structures is achieved.
Patent Information
- Application Number
- CN202510334946.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-06-27
AI Technical Summary
The prior art is difficult to effectively study the durability of energy underground structures under temperature and chloride ion coupling, especially in complex environments of cyclic temperature load and chloride ion erosion.
A durability test device for energy underground structures under temperature and ion coupling is designed, including a water bath, fixture module, water chiller and power supply. By cycling and changing temperature, ion migration is accelerated, the underground environment is simulated, and the mechanical properties, microstructure and corrosion conditions of the test block are detected.
It has achieved efficient research on the process and mechanism of the deterioration of the life cycle of the energy underground structure under the effect of temperature and ion coupling, and can comprehensively detect multiple durability parameters to ensure the safety and scientificity of the test process.
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Figure CN120213792A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of durability test of underground energy structures, and in particular to a device and method for durability test of underground energy structures under the coupling of temperature and ions. Background Art
[0002] The world is currently facing challenges in energy transformation, climate change and sustainable development. Geothermal energy has become one of the important new energy sources to solve these problems due to its advantages such as abundant reserves, stable and efficient, and renewable. Using energy underground structures with ground source heat pump systems to mine shallow geothermal energy is an effective way to solve building energy problems. Energy underground structures include energy piles, energy tunnels, energy underground continuous walls and other structures. As an innovative renewable energy technology, it plays an increasingly important role in the energy supply of buildings.
[0003] At the Third National Academic Seminar on Energy Underground Structures and Engineering, it was pointed out that durability is one of the key factors restricting the promotion of energy underground structures such as energy piles. Energy underground structure projects in coastal areas are in an underground environment rich in chloride ions all year round. The combined influence of factors such as chloride ion corrosion and cyclic temperature loads poses a strict test on the durability of reinforced concrete structures. At present, although the research on the durability of reinforced concrete structures under chemical corrosion at home and abroad has been relatively sufficient, unlike ordinary reinforced concrete structures, energy underground structures are under cyclic temperature loads all year round. The study of their durability involves the coupling of temperature fields and other physical fields, and the degradation mechanism and control equations are more complicated. At present, there is insufficient research on relevant test equipment and methods for the durability of energy underground structures under cyclic temperature.
[0004] The study of the durability of underground energy structures under the coupling of temperature and chloride ions involves the degradation process of a series of durability parameters such as the macroscopic mechanical properties, microstructure, chloride ion penetration, and steel corrosion of reinforced concrete under cyclic temperature loads and chloride ion erosion. In addition, the test device system needs to have the functions of cyclic temperature change and accelerated ion migration, and solve the problem of timely treatment of harmful gases. Summary of the invention
[0005] The present invention is made to solve the above-mentioned problems, and aims to provide a device and method for testing the durability of underground energy structures under the coupling of temperature and ions.
[0006] The present invention provides a durability test device for an energy underground structure under the coupling action of temperature and ions, which is used to test specimens of the energy underground structure and has the following characteristics: it includes a water bath tank, which has a tank body, a water inlet, a water outlet and at least one tank opening. The water inlet and the water outlet are both arranged on the tank body, and the tank opening is arranged at the top of the tank body and is used to adjust the temperature of the specimens of the energy underground structure; at least one fixture module, which is correspondingly arranged with at least one tank opening. The outside of the fixture module is wrapped with a waterproof film and is arranged inside the tank body through the tank opening. The fixture module is used to allow ions to pass through the specimens of the energy underground structure; a heat preservation cover plate, which has at least one opening and is arranged on the tank body. At least one opening is correspondingly arranged with at least one tank opening of the water bath tank; a chiller, which is connected to the water inlet of the water bath tank through an inlet pipe and is connected to the water outlet of the water bath tank through an outlet pipe; a power supply, which is connected to the fixture module through a wire.
[0007] In the durability test device for an energy underground structure under the coupling action of temperature and ions provided by the present invention, it may also have the following characteristics: among them, the number of tank openings of the water bath tank is multiple, and each tank opening is correspondingly provided with a fixture module.
[0008] In the durability test device for an energy underground structure under the coupling action of temperature and ions provided by the present invention, it may also have the following characteristics: among them, there are multiple fixture modules, and all the fixture modules are connected in parallel to the power supply through wires.
[0009] In the durability test device for an energy underground structure under the coupling action of temperature and ions provided by the present invention, it may also have the following characteristics: among them, the tank body is of a cuboid structure, the water outlet is located above the water inlet, and the water outlet and the water inlet are located on the same side or different sides of the tank body.
[0010] In the durability test device for an energy underground structure under the coupling action of temperature and ions provided by the present invention, it may also have the following characteristics: among them, the chiller further includes a control module, and the control module is configured to execute programmable water temperature control and drive the chiller to make the water temperature reach a preset temperature value within a set time.
[0011] In the durability test device for an energy underground structure under the coupling action of temperature and ions provided by the present invention, it may also have the following characteristics: among them, the fixture module includes: a fixture, which includes a first fixture and a second fixture. The first fixture and the second fixture can adjust their relative positions to clamp the specimens of the energy underground structure. Fixture slots are respectively arranged at the tops of the first fixture and the second fixture; a solution tank, which includes a first solution tank and a second solution tank. The first solution tank and the second solution tank are respectively arranged on the sides of the first fixture and the second fixture; electrode plates, which include a first electrode plate and a second electrode plate. The first electrode plate and the second electrode plate are respectively arranged in the first solution tank and the second solution tank, and the electrode plates are connected to the power supply through wires.
[0012] In the durability test device for energy underground structures under the coupling action of temperature and ions provided by the present invention, it may further have the following characteristics: Among them, the first electrode plate is connected to the positive pole of the power supply, and the second electrode plate is connected to the negative pole of the power supply.
[0013] In the durability test device for energy underground structures under the coupling action of temperature and ions provided by the present invention, it may further have the following characteristics: Among them, the first electrode plate is a titanium electrode plate with a platinum coating, and the second electrode plate is a titanium electrode plate.
[0014] In the durability test device for energy underground structures under the coupling action of temperature and ions provided by the present invention, it may further have the following characteristics: Among them, sodium hydroxide solution is added to the first solution tank, and sodium chloride solution is added to the second solution tank.
[0015] The present invention provides a durability test method for energy underground structures under the coupling action of temperature and ions, which is applied to the durability test device for energy underground structures under the coupling action of temperature and ions as described in any one of the above, and has the following characteristics. Specifically, it includes the following test steps:
[0016] Step S1: Install the energy underground structure test block in the fixture module, fill the solution tank with water, let it stand for 3 minutes after filling. If there is no liquid leakage between the fixture and the energy underground structure test block, it means the seal is good, and then pour out the water; Step S2: Start the chiller, set the required temperature control conditions, and let the chiller run for 5 minutes to make the water temperature reach the preset temperature value; Step S3: Add sodium hydroxide solution to the first solution tank and sodium chloride solution to the second solution tank, and preheat for 10 minutes to make the temperature of the energy underground structure test block reach the preset temperature value; Step S4: Connect the first electrode plate to the positive pole of the power supply through a wire, and connect the second electrode plate to the negative pole of the power supply through a wire; Step S5: Turn on the power supply, apply electricity to the electrode plates, and record the current reading of the power supply at every first preset time interval. After the second preset time interval, turn off the power supply, and the test is completed; Step S6: Detect the mechanical properties, micro and mesoscopic structures, ion penetration status, and corrosion status of the energy underground structure test block.
[0017] Functions and effects of the invention
[0018] According to the durability test device and method of an energy underground structure under the coupling action of temperature and ions involved in the present invention, because the test block of the energy underground structure is installed in the fixture module, water is injected into the solution tank, and after it is filled, it is left standing for 3 minutes. If there is no liquid leakage between the fixture and the test block of the energy underground structure, it means the seal is good, and then the water is poured out; the chiller is started, and the required temperature control conditions are set, and the chiller is allowed to run for 5 minutes to make the water temperature reach the preset temperature value; sodium hydroxide solution is added to the first solution tank, and sodium chloride solution is added to the second solution tank, and it is preheated for 10 minutes to make the temperature of the test block of the energy underground structure reach the preset temperature value; the first electrode plate is connected to the positive pole of the power supply through a wire, and the second electrode plate is connected to the negative pole of the power supply through a wire; the power supply is turned on, electricity is supplied to the electrode plates, and the current reading of the power supply is recorded every first preset time interval. When the second preset time interval has passed, the power supply is turned off, and the test is completed; the mechanical properties, micro-meso structure, ion penetration condition, and corrosion condition of the test block of the energy underground structure are detected. Therefore, the durability test device and method of the energy underground structure under the coupling action of temperature and ions of the present invention realize the application of the cyclic temperature load of the energy underground structure through a constant-temperature high-precision chiller and a water bath tank, and the temperature control device system has an opening, which can timely discharge the hydrogen (flammable and explosive gas) generated at the cathode and the chlorine (toxic and highly corrosive gas) that may be generated at the cathode, ensuring the safety of the test process, and can also efficiently study the durability degradation process and mechanism of the energy underground structure during its entire life cycle. In addition, the test of each test block can obtain not only a single parameter as in a conventional test, but also multiple durability parameters including macroscopic mechanical properties, concrete micro-meso structure, chloride ion penetration condition, and steel bar corrosion condition. Compared with the conventional test, this test method is more comprehensive in analysis and more in line with the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic structural diagram of the durability test device of the energy underground structure under the coupling action of temperature and ions in the embodiment of the present invention.
[0020] Figure 2 It is a schematic structural diagram of the water bath tank in the embodiment of the present invention.
[0021] Figure 3 It is a schematic structural diagram of the fixture module in the embodiment of the present invention.
[0022] Figure 4 It is a schematic structural diagram of the first electrode plate in the embodiment of the present invention.
[0023] Figure 5 It is a schematic structural diagram of the heat preservation cover plate in the embodiment of the present invention.
[0024] Figure 6 It is a schematic flow diagram of the durability test method of the energy underground structure under the coupling action of temperature and ions in the embodiment of the present invention. Specific Embodiments
[0025] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0026] In order to make the technical means, creative features, achieved objectives, and functions of the present invention easy to understand, the following embodiments will specifically describe the durability test device and method for energy underground structures under the coupling action of temperature and ions of the present invention in conjunction with the accompanying drawings.
[0027] Embodiment
[0028] Figure 1 is a schematic structural diagram of the durability test device 100 for energy underground structures under the coupling action of temperature and ions in the embodiments of the present invention.
[0029] As Figure 1 shown, the durability test device 100 for energy underground structures under the coupling action of temperature and ions in the embodiments of the present invention includes: a water bath 10, a fixture module 20, a heat preservation cover plate 30, a chiller 40, and a power supply 50.
[0030] Figure 2 is a schematic structural diagram of the water bath 10 in the embodiments of the present invention.
[0031] As Figure 2 shown, the water bath 10 in the embodiments of the present invention includes: a tank body 11, a water inlet 12, a water outlet 13, and a tank opening 14.
[0032] The water bath 10 has a tank body 11, a water inlet 12, a water outlet 13, and a tank opening 14. The water inlet 12 and the water outlet 13 are both arranged on the tank body 11. The tank opening 14 is arranged at the top of the tank body 11 and is used to adjust the temperature of the energy underground structure test block. Among them, the number of tank openings of the water bath 10 is multiple, and each tank opening is correspondingly provided with a fixture module 20. The tank body 11 is a cuboid structure. The water outlet 13 is located above the water inlet 12. The water outlet 13 and the water inlet 12 are located on the same side or different sides of the tank body 11. The water bath 10 is composed of an inner and outer stainless steel skin and an intermediate heat preservation cotton sandwich.
[0033] Figure 3 is a schematic structural diagram of the fixture module 20 in the embodiments of the present invention.
[0034] As shown Figure 3 in FIG. 2, in an embodiment of the present invention, the fixture module 20 includes: a first fixture 21, a second fixture 22, a first solution tank 23, a second solution tank 24, a first electrode plate 25, a second electrode plate 26, and an energy underground structure test block 27.
[0035] At least one fixture module 20 is correspondingly arranged with at least one notch 14. The fixture module 20 is wrapped with a waterproof film on the outside and is arranged inside the tank body 11 through the notch 14. The fixture module 20 is used to allow ions to pass through the energy underground structure test block 27.
[0036] The first fixture 21 and the second fixture 22 can adjust their relative positions to clamp the energy underground structure test block 27. Fixture notches are respectively provided at the tops of the first fixture 21 and the second fixture 22. The first solution tank 23 and the second solution tank 24 are respectively arranged on the sides of the first fixture 21 and the second fixture 22. The sizes of the first fixture 21 and the second fixture 22 can be adjusted according to the size change of the energy underground structure test block 27. The first electrode plate 25 and the second electrode plate 26 are respectively arranged in the first solution tank 23 and the second solution tank 24. The electrode plates are connected to the power supply 50 through wires. Among them, the first electrode plate 25 is connected to the positive pole of the power supply 50, and the second electrode plate 26 is connected to the negative pole of the power supply 50. The first electrode plate 25 is a platinum-coated titanium electrode plate, and the second electrode plate 26 is a titanium electrode plate.
[0037] Sodium hydroxide solution is added to the first solution tank 23, and sodium chloride solution is added to the second solution tank 24. The sodium hydroxide solution can be replaced with tap water. At this time, the platinum-coated titanium electrode plate can be replaced with a ruthenium-iridium-titanium electrode plate or other inert electrode plates.
[0038] Figure 4 FIG. 5 is a schematic structural diagram of the first electrode plate 25 in an embodiment of the present invention.
[0039] As shown Figure 4 in FIG. 6, the first electrode plate 25 is provided with a lug 251 to facilitate the connection of the wire of the power supply 50.
[0040] Figure 5 FIG. 7 is a schematic structural diagram of the heat preservation cover plate 30 in an embodiment of the present invention.
[0041] As shown Figure 5 in FIG. 8, in an embodiment of the present invention, the heat preservation cover plate 30 has at least one opening 31, which is arranged on the tank body 11. At least one opening 31 is correspondingly arranged with at least one notch 14 of at least one water bath tank 10. The heat preservation cover plate 30 is composed of an inner and outer stainless steel sheet and an intermediate heat preservation cotton sandwich.
[0042] The chiller 40 is connected to the water inlet 12 of the water bath tank 10 through an inlet pipe and to the water outlet 13 of the water bath tank 10 through an outlet pipe. The chiller 40 further includes a control module configured to perform programmable water temperature control and drive the chiller 40 to reach a preset temperature value within a set time.
[0043] The power supply 50 is connected to the fixture module 20 through a wire and uses a regulated DC power supply.
[0044] Figure 6 It is a schematic flow diagram of the durability test method for the energy underground structure under the coupling action of temperature and ions in the embodiment of the present invention.
[0045] As Figure 6 shown, the durability test method for the energy underground structure under the coupling action of temperature and ions in the embodiment of the present invention specifically includes the following experimental steps:
[0046] Step S1: Install the energy underground structure test block 27 in the fixture module 20, fill the solution tank with water, let it stand for 3 minutes after filling. If there is no liquid leakage between the fixture and the energy underground structure test block 27, it is well sealed, and then pour out the water.
[0047] Step S2: Start the chiller 40, set the required temperature control conditions, and let the chiller 40 run for 5 minutes to reach the preset temperature value.
[0048] Step S3: Add sodium hydroxide solution to the first solution tank 23 and sodium chloride solution to the second solution tank 24, and preheat for 10 minutes to make the temperature of the energy underground structure test block 27 reach the preset temperature value. Among them, the concentration of the sodium hydroxide solution is 0.3 mol / L, and the mass fraction of the sodium chloride solution is 5%.
[0049] Step S4: Connect the first electrode plate 25 to the positive pole of the power supply 50 through a wire, and connect the second electrode plate 26 to the negative pole of the power supply 50 through a wire.
[0050] Step S5: Turn on the power supply 50, energize the electrode plates, accelerate the erosion of the negative chloride ions on the energy underground structure test block 27, and record the current reading of the power supply 50 every first preset time interval. When the second preset time interval has passed, turn off the power supply 50, and the test is completed. Among them, the power supply 50 is a regulated DC power supply, set a constant voltage of 60V and a maximum current of 3A, and replace the sodium chloride solution and sodium hydroxide solution every first preset time interval to keep their concentrations unchanged.
[0051] Step S6: Detect the mechanical properties, micro and mesoscopic structures, ion penetration status, and corrosion status of the energy underground structure specimen 27. Among them, by setting different temperature conditions for the chiller 40, the variation law of the durability parameters of the energy underground structure specimen 27 under different constant temperatures and cyclic temperatures can be studied. By setting different constant voltage magnitudes for the power supply 50, the influence law of the electric field strength on the chloride ion erosion of the energy underground structure specimen 27 can be studied. By real-time monitoring the variation law of the current magnitude and the crack variation law of the energy underground structure specimen 27 under the action of constant voltage, the influence of cracks on the chloride ion erosion rate can be reflected to a certain extent.
[0052] Among them, after the energy underground structure specimen 27 is poured, the demolded specimen needs to be placed in a standard curing room until the 28-day age. One day before the durability test of the energy underground structure under the coupling action of temperature and ions, the energy underground structure specimen 27 is subjected to vacuum saturation water treatment.
[0053] Functions and effects of the embodiment
[0054] The durability test device and method of the energy underground structure under the coupling action of temperature and ions in this embodiment realize the application of the cyclic temperature load of the energy underground structure through a constant-temperature high-precision chiller and a water bath. And the temperature control device system has an opening to timely discharge the hydrogen (flammable and explosive gas) generated at the cathode and the chlorine gas (toxic and highly corrosive gas) that may be generated at the cathode, ensuring the safety of the test process. It can also efficiently study the durability degradation process and mechanism of the energy underground structure during its entire life cycle. In addition, the test of each specimen is different from the conventional test that can only obtain a single parameter, but can obtain multiple durability parameters including macroscopic mechanical properties, concrete micro and mesoscopic structures, chloride ion penetration status, and steel bar corrosion status. Compared with the conventional test, this test method is more comprehensive in analysis and more in line with the actual situation.
[0055] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims
1. A durability test device for energy underground structure under temperature and ion coupling, used for testing energy underground structure test blocks, characterized in that: include: A water bath tank, comprising a tank body, a water inlet, a water outlet and at least one notch, wherein the water inlet and the water outlet are both arranged on the tank body, and the notch is arranged on the top of the tank body and is used to adjust the temperature of the energy underground structure test block; At least one fixture module is arranged corresponding to the at least one notch, the fixture module is wrapped with a waterproof film on the outside, and is arranged inside the tank body through the notch, and the fixture module is used to allow ions to pass through the energy underground structure test block; A heat-insulating cover plate having at least one opening, disposed on the tank body, wherein the at least one opening is disposed corresponding to a notch of the at least one water bath tank; A water chiller, connected to the water inlet of the water bath through a water inlet pipe, and connected to the water outlet of the water bath through a water outlet pipe; A power supply is connected to the fixture module through a wire.
2. The energy underground structure durability test device under temperature and ion coupling according to claim 1 is characterized by: in, The water bath has a plurality of slots, and each slot corresponds to a fixture module.
3. The durability test device for underground energy structures under temperature and ion coupling according to claim 1 is characterized in that: in, There are multiple clamp modules, and all the clamp modules are connected in parallel to the power supply through the wires.
4. The durability test device for underground energy structures under temperature and ion coupling according to claim 1 is characterized in that: in, The trough body is a rectangular parallelepiped structure, the water outlet is located above the water inlet, and the water outlet and the water inlet are located on the same side or different sides of the trough body.
5. The durability test device for underground energy structures under temperature and ion coupling according to claim 1 is characterized in that: in, The chiller also includes a control module, which is configured to perform programmable water temperature control and drive the chiller to make the water temperature reach a preset temperature value within a set time.
6. The energy underground structure durability test device under the temperature and ion coupling effect according to claim 1, Features: Wherein, the fixture module comprises: A clamp, comprising a first clamp and a second clamp, wherein the first clamp and the second clamp can adjust relative positions to clamp the energy underground structure test block, and the first clamp and the second clamp are respectively provided with clamp notches on their tops; A solution tank, comprising a first solution tank and a second solution tank, wherein the first solution tank and the second solution tank are respectively disposed on the sides of the first fixture and the second fixture; The electrode plate comprises a first electrode plate and a second electrode plate, wherein the first electrode plate and the second electrode plate are respectively arranged in the first solution tank and the second solution tank, and the electrode plate is connected to a power supply through a wire.
7. The durability test device for underground energy structures under temperature and ion coupling according to claim 6 is characterized by: in, The first electrode plate is connected to the positive electrode of the power supply, and the second electrode plate is connected to the negative electrode of the power supply.
8. The energy underground structure durability test device under temperature and ion coupling according to claim 6 is characterized by: in, The first electrode plate is a platinum-plated titanium electrode plate, and the second electrode plate is a titanium electrode plate.
9. The energy underground structure durability test device under temperature and ion coupling according to claim 6 is characterized by: in, Sodium hydroxide solution is added into the first solution tank, and sodium chloride solution is added into the second solution tank.
10. A method for testing the durability of underground energy structures under the effects of temperature and ion coupling, applied to the device for testing the durability of underground energy structures under the effects of temperature and ion coupling as described in claims 1 to 9, characterized in that: The specific test steps include the following: Step S1, install the energy underground structure test block in the fixture module, fill the solution tank with water, and let it stand for 3 minutes after filling. If there is no leakage between the fixture and the energy underground structure test block, the seal is good, and pour out the water; Step S2, start the chiller, set the required temperature control conditions, and let the chiller run for 5 minutes to make the water temperature reach the preset temperature value; Step S3, adding sodium hydroxide solution into the first solution tank, adding sodium chloride solution into the second solution tank, and preheating for 10 minutes so that the temperature of the energy underground structure test block reaches a preset temperature value; Step S4, connecting the first electrode plate to the positive electrode of the power supply through a wire, and connecting the second electrode plate to the negative electrode of the power supply through a wire; Step S5, turning on the power supply, energizing the electrode plate, and recording the current reading of the power supply after a first preset time interval, and turning off the power supply after a second preset time interval, and the test is completed; Step S6, detecting the mechanical properties, microstructure, ion penetration and corrosion conditions of the energy underground structure test block.