A cold energy winter storage and summer release ventilation frozen soil roadbed and foundation temperature field change control system

Abstract

The present application belongs to the technical field of permafrost protection, and particularly relates to a ventilation permafrost roadbed and foundation temperature field change control system with cold energy winter storage and summer release. In winter with an average temperature of -12 DEG C to -16 DEG C, cold air preferentially enters a liquid refrigerant tank underground, solidifies the liquid refrigerant, prevents the cold air from directly entering a ventilation pipe, causes roadbed freeze-thaw, and produces uneven settlement. In summer with an average temperature of 4 DEG C to 12 DEG C, hot air enters the liquid refrigerant tank underground along an air outlet pipe, the cold energy stored in winter is released, the air temperature is lowered, and then the air enters the ventilation pipe, so as to control the foundation temperature field change and prevent the permafrost foundation from being heated. The present application inhibits the temperature field change of the permafrost foundation under the roadbed, keeps the temperature inside the ventilation pipe basically constant, and avoids the development of the permafrost thawing, sinking and deformation.

Description

Technical Field

[0001] This invention belongs to the field of permafrost protection technology, specifically relating to a ventilated permafrost roadbed and foundation temperature field change control system that allows for cold energy storage in winter and release in summer. Background Technology

[0002] Permafrost is a layer of rock and soil containing ice at temperatures below freezing. It is extremely sensitive to seasonal temperature changes; it melts and sinks when heated, and freezes and expands when cooled, significantly impacting the stability of the foundation. In the Qinghai-Tibet Plateau region, the area of ​​high-altitude permafrost reaches 1.5 million square kilometers, and in most areas, the permafrost is of metastable or transitional type. Studies have shown that from 2000 to 2022, the average annual ground temperature of permafrost in the Qinghai-Tibet Plateau region ranged from -2.6℃ to 0℃, with most areas experiencing an average annual ground temperature between -1.5℃ and -0.5℃.

[0003] Currently, against the backdrop of climate change, the average annual ground temperature of permafrost is rising. The high-altitude permafrost on the Qinghai-Tibet Plateau is highly sensitive to heat and undergoes severe degradation due to warming, leading to frequent engineering disasters such as roadbed subsidence and pavement cracking, which are characterized by their hidden nature, long duration, and suddenness.

[0004] Studies suggest that heat absorption in the cross-section of permafrost roadbeds is the primary cause of energy imbalance and thaw settlement in permafrost. Secondary highways, due to their narrow pavement and slopes, develop thaw basins in the permafrost layer; railways, due to ballast heat dissipation and slope heat absorption, develop thaw interlayers within the roadbed. Expressways, with their larger roadbed and pavement structures, exhibit a significant heat accumulation effect, triggering thaw basins on a much larger scale than the former two types, leading to more severe thawing and degradation of the underlying permafrost foundation. Increased road width significantly increases the heat absorption of the roadbed, accelerating the warming, thawing, and degradation process of the underlying permafrost, and also increasing the likelihood of thaw settlement damage to the roadbed.

[0005] Therefore, in existing technologies, the effective range and intensity of traditional insulation and cooling technologies are insufficient to control uniform cooling and overall temperature rise of the frozen soil foundation under the strong thermal boundary of large-scale highways. How to isolate the disturbance of the wide roadbed to the frozen soil and the heat added to the frozen soil by the thick black asphalt pavement, prevent the frozen soil from absorbing heat, control the temperature field changes of the frozen soil foundation under the roadbed, and avoid the development of frozen soil thaw settlement and deformation are key issues in frozen soil engineering. To this end, we propose a ventilated frozen soil roadbed and foundation temperature field change control system that stores cold energy in winter and releases it in summer. Summary of the Invention

[0006] The purpose of this invention is to provide a ventilated frozen soil roadbed and foundation temperature field change control system that stores cold energy in winter and releases it in summer. In winter, when the average temperature is -12℃ to 16℃, cold air preferentially enters the underground liquid refrigerant tank to solidify the liquid refrigerant and prevent cold air from directly entering the ventilation pipe, which would cause the roadbed to freeze and thaw, resulting in uneven settlement. In summer, when the average temperature is 4℃ to 12℃, hot air enters the underground liquid refrigerant tank along the exhaust pipe, releasing the cold energy stored in winter and lowering the air temperature before entering the ventilation pipe. This controls the change in the foundation temperature field and prevents the frozen soil foundation from heating up.

[0007] The specific technical solution adopted by this invention is as follows: A ventilated frozen soil roadbed and foundation temperature field change control system for storing cold energy in winter and releasing it in summer includes a frozen soil roadbed temperature control system. The frozen soil roadbed temperature control system includes ventilation pipes arranged at equal intervals on the roadbed and a cold energy storage and release device connected to the ventilation pipes. The cold energy storage and release device is used to store cold energy in winter and release cold energy in summer through the ventilation pipes.

[0008] Preferably, the cold energy storage and release device includes a first air duct connected to both ends of the ventilation duct, a rectangular insulation pipe, and an air pump. The first air duct is connected to the lower end of the rectangular insulation pipe, and the air outlet of the air pump is connected to an air outlet pipe. The end of the air outlet pipe is connected to the upper end of the rectangular insulation pipe.

[0009] Preferably, the rectangular insulation pipe has a refrigerant tank inside, the refrigerant tank has a rectangular spiral tube structure, and the refrigerant tank is filled with refrigerant.

[0010] Preferably, each of the air pump outlets is connected to the ends of the three air outlet pipes.

[0011] Preferably, a first temperature sensor group is installed inside the roadbed, and a second temperature sensor group and a controller are installed outside the air pump.

[0012] Preferably, the system also includes a photovoltaic panel for supplying power to the air pump, the first temperature sensor group, the second temperature sensor group, and the controller.

[0013] Preferably, the air pump inlet is connected to an air inlet pipe, and an air filter is connected to the end of the air inlet pipe.

[0014] Preferably, the controller internally operates an automatic control module, which includes a temperature acquisition unit, a data processing unit, and a drive unit; The temperature acquisition unit collects frozen soil temperature data of the roadbed through the first temperature sensor group and ambient temperature data through the second temperature sensor group. The temperature acquisition unit then sends the frozen soil temperature data and ambient temperature data to the data processing unit. The data processing unit processes the ambient temperature data and the frozen soil temperature data. The specific processing process is as follows: if the ambient temperature data is less than 0°C, a first driving signal is generated; if the frozen soil temperature data is greater than 0°C, a second driving signal is generated. After receiving the first drive signal, the drive unit starts the air pump and blows outside cold air into the rectangular insulation pipe. After the refrigerant tank is cooled, the refrigerant inside the refrigerant tank condenses and stores cold energy. After receiving the second drive signal, the drive unit starts the air pump and blows outside air into the rectangular insulation pipe. The outside air releases cold energy and is cooled after passing through the refrigerant tank, and then enters the ventilation pipe through the first air pipe to cool the roadbed.

[0015] The technical effects achieved by this invention are as follows: In winter, when the ambient temperature data collected by the second temperature sensor group is below 0°C, cold air is pumped into the rectangular insulation pipe through the air outlet pipe and circulates in the refrigerant tank inside the underground rectangular insulation pipe. The liquid refrigerant inside the refrigerant tank gradually solidifies, and the refrigerant solid stores cold energy. This prevents cold air from directly passing through the ventilation pipe, eliminating the heat energy stored in the roadbed cover, changing the temperature field of the frozen soil foundation, causing freeze-thaw settlement, and uneven settlement and deformation of the roadbed that damages the pavement.

[0016] In practical use, during summer, the ambient temperature data collected by the second temperature sensor group is above 0°C. At this time, the temperature of the frozen soil in the roadbed increases. Then, when the frozen soil temperature data collected by the first temperature sensor group is greater than 0°C, the high-temperature hot air is pumped into the rectangular insulation pipe through the air outlet pipe and circulates in the refrigerant tank inside the underground rectangular insulation pipe. The refrigerant inside the refrigerant tank releases cold energy, and after the temperature of the hot air decreases, it is then controlled through the ventilation pipe to control the rise and change of the ground temperature field in summer, preventing the frozen soil from absorbing too much heat, causing energy imbalance, and triggering thaw settlement.

[0017] In this invention, the air outlet pipe and the rectangular insulation pipe are placed vertically, allowing air to enter vertically and reducing the temperature of the circulating air. The photovoltaic power generation panel drives the air pump, which, under the control of the controller, controls the air flow rate, accelerating the flow of cold air in winter and slowing down the flow of hot air in summer. The frozen soil subgrade temperature control system suppresses changes in the temperature field of the frozen soil foundation under the roadbed, keeps the internal temperature of the ventilation pipe basically constant, and avoids the development of frozen soil thaw settlement and deformation. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of a ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer according to the present invention. Figure 2 This is a top view of a ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer according to the present invention; Figure 3 This is a frontal cross-section of a cold energy storage and release system for ventilated frozen soil roadbed and foundation temperature field changes according to the present invention. Figure 4 This is a system block diagram of a ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer according to the present invention; Figure 5 This is a schematic diagram of the frozen soil roadbed temperature control system of the present invention; Figure 6 This is a system flowchart of a ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer according to the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Roadbed; 2. Ventilation duct; 3. Cold energy storage and release device; 4. Photovoltaic power generation panel; 301. First air duct; 302. Rectangular insulated pipe; 303. Air pump; 304. Air outlet pipe; 305. Refrigerant tank; 306. First temperature sensor group; 307. Second temperature sensor group; 308. Controller; 309. Air inlet pipe; 310. Filter. Detailed Implementation

[0020] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0021] like Figure 1 , Figure 2 as well as Figure 3 As shown, a ventilated frozen soil roadbed and foundation temperature field change control system for storing cold energy in winter and releasing it in summer includes a frozen soil roadbed temperature control system. The frozen soil roadbed temperature control system includes ventilation pipes 2 evenly spaced on the roadbed 1 and a cold energy storage and release device 3 connected to the ventilation pipes 2. The cold energy storage and release device 3 is used to store cold energy in winter and release cold energy in summer through the ventilation pipes 2; thereby realizing the control of the temperature field change of the ventilated frozen soil roadbed 1 and foundation for storing and releasing cold energy in winter and releasing it in summer, and stabilizing the temperature field of the frozen soil roadbed 1 and foundation.

[0022] like Figure 1 , Figure 2 as well as Figure 3As shown, the cold energy winter storage and summer release device 3 includes a first air pipe 301 connected to both ends of the ventilation pipe 2, a rectangular insulation pipe 302 and an air pump 303. The first air pipe 301 is connected to the lower end of the rectangular insulation pipe 302. The air outlet of the air pump 303 is connected to an air outlet pipe 304. The end of the air outlet pipe 304 is connected to the upper end of the rectangular insulation pipe 302.

[0023] The rectangular insulation pipe 302 has a refrigerant tank 305 inside. The refrigerant tank 305 has a rectangular spiral tube structure and is filled with refrigerant. The rectangular insulation pipe 302 and the refrigerant tank 305 are located underground.

[0024] like Figure 1 , Figure 2 as well as Figure 3 As shown, the air outlet of each air pump 303 is connected to the end of three air outlet pipes 304; one air pump 303 simultaneously provides flowing air to three sets of refrigerant tanks 305, which greatly saves the amount of air pump 303 used and saves engineering costs.

[0025] The roadbed 1 is equipped with a first temperature sensor group 306, and the air pump 303 is equipped with a second temperature sensor group 307 and a controller 308.

[0026] It also includes a photovoltaic panel 4, which is used to power the air pump 303, the first temperature sensor group 306, the second temperature sensor group 307, and the controller 308.

[0027] It should be added that the photovoltaic panel 4 in this embodiment is used for photovoltaic power generation and to supply power to other electrical components, which is common knowledge to those skilled in the art and will not be described in detail here.

[0028] The air pump 303 has an air inlet connected to an air inlet pipe 309, and an air filter 310 is connected to the end of the air inlet pipe 309. Under the action of the air pump 303, air is drawn from the outside through the air inlet pipe 309. By setting the filter 310, dust in the environment is prevented from clogging the air pump 303, thus improving the service life of the air pump 303.

[0029] The controller 308 has an internal automatic control module, which includes a temperature acquisition unit, a data processing unit, and a drive unit. like Figure 4 , Figure 5 as well as Figure 6 As shown, the temperature acquisition unit collects the frozen soil temperature data of the roadbed 1 through the first temperature sensor group 306 and the ambient temperature data through the second temperature sensor group 307. The temperature acquisition unit sends the frozen soil temperature data and the ambient temperature data to the data processing unit. The data processing unit processes the ambient temperature data and the frozen soil temperature data. The specific processing procedure is as follows: if the ambient temperature data is less than 0°C, a first driving signal is generated; if the frozen soil temperature data is greater than 0°C, a second driving signal is generated. like Figure 4 , Figure 5 as well as Figure 6 After receiving the first drive signal, the drive unit starts the air pump 303, blowing outside cold air into the rectangular insulation pipe 302. After the refrigerant tank 305 is cooled, the refrigerant inside the refrigerant tank 305 condenses and stores cold energy. After receiving the second drive signal, the drive unit starts the air pump 303, blowing outside air into the rectangular insulation pipe 302. After the outside air passes through the refrigerant tank 305 and releases cold energy to cool down, it enters the ventilation pipe 2 through the first air pipe 301 to cool the roadbed 1.

[0030] like Figure 1-6 As shown, in actual use, during winter, the ambient temperature data collected by the second temperature sensor group 307 is below 0°C. Cold air is pumped by the air pump 303 through the air outlet pipe 304 into the rectangular insulation pipe 302, where it circulates in the refrigerant tank 305 inside the underground rectangular insulation pipe 302. The liquid refrigerant inside the refrigerant tank 305 gradually solidifies, and the refrigerant solid stores cold energy. This prevents cold air from directly passing through the ventilation pipe 2, eliminating the heat energy stored under the roadbed 1, changing the temperature field of the frozen soil foundation, causing freeze-thaw cycles and resulting in thaw settlement, as well as uneven settlement and deformation of the roadbed 1 that damages the pavement.

[0031] like Figure 1-6 As shown, in actual use, during summer, the ambient temperature data collected by the second temperature sensor group 307 is above 0°C. At this time, the temperature of the frozen soil of the roadbed 1 increases. When the temperature data of the frozen soil of the roadbed 1 collected by the first temperature sensor group 306 is greater than 0°C, the high-temperature hot air is pumped by the air pump 303 through the air outlet pipe 304 into the rectangular insulation pipe 302. It circulates in the refrigerant tank 305 inside the underground rectangular insulation pipe 302. The refrigerant inside the refrigerant tank 305 releases cold energy. After the temperature of the hot air decreases, it is then controlled through the ventilation pipe 2 to prevent the ground temperature field from rising and changing in summer, thus preventing the frozen soil from absorbing too much heat, causing energy imbalance and triggering thawing and settlement.

[0032] like Figure 1-6 As shown, in this invention, the air outlet pipe 304 and the rectangular heat insulation pipe 302 are placed vertically, allowing air to enter vertically, which can reduce the temperature of the circulating air. The photovoltaic power generation panel 4 drives the air pump 303, which, under the control of the controller 308, controls the air flow rate, accelerates the flow of cold air in winter, and slows down the flow of hot air in summer.

[0033] like Figure 1-6As shown, it is worth mentioning that the frozen soil subgrade temperature control system of this invention suppresses the temperature field changes of the frozen soil foundation under the road subgrade 1, keeps the internal temperature of the ventilation pipe 2 basically constant, and avoids the development of frozen soil thaw settlement and deformation.

[0034] like Figure 1-6 As shown, it is worth mentioning that in winter, when the average temperature is -12℃ to -16℃, cold air preferentially enters the underground liquid refrigerant tank 305 to solidify the liquid refrigerant and prevent cold air from directly entering the ventilation pipe 2, which would cause the roadbed 1 to freeze and thaw, resulting in uneven settlement. In summer, when the average temperature is 4℃ to 12℃, hot air enters the underground liquid refrigerant tank 305 along the exhaust pipe 304, releasing the cold energy stored in winter and lowering the air temperature. Then, it enters the ventilation pipe 2, thereby controlling the change in the foundation temperature field and preventing the frozen soil foundation from warming up.

[0035] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer, comprising a frozen soil roadbed temperature control system, characterized in that: The frozen soil subgrade temperature control system includes ventilation pipes (2) set at equal intervals on the subgrade (1) and a cold energy storage and release device (3) connected to the ventilation pipes (2). The cold energy storage and release device (3) is used to store cold energy in winter and release cold energy in summer through the ventilation pipes (2).

2. The control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 1, is characterized in that: The cold energy storage and release device (3) includes a first air pipe (301) connected to both ends of the ventilation pipe (2), a rectangular insulation pipe (302) and an air pump (303). The first air pipe (301) is connected to the lower end of the rectangular insulation pipe (302). The air outlet of the air pump (303) is connected to an air outlet pipe (304). The end of the air outlet pipe (304) is connected to the upper end of the rectangular insulation pipe (302).

3. A control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 2, is characterized in that: The rectangular insulation pipe (302) has a refrigerant tank (305) inside. The refrigerant tank (305) has a rectangular spiral tube structure and is filled with refrigerant.

4. A control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 3, is characterized in that: Each of the air pumps (303) has an air outlet connected to the ends of the three air outlet pipes (304).

5. A ventilated frozen soil roadbed and foundation temperature field change control system for cold energy storage in winter and release in summer, as described in claim 4, is characterized in that: The roadbed (1) is equipped with a first temperature sensor group (306) inside, and the air pump (303) is equipped with a second temperature sensor group (307) and a controller (308) outside.

6. A control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 5, is characterized in that: It also includes a photovoltaic panel (4) for powering the air pump (303), the first temperature sensor group (306), the second temperature sensor group (307) and the controller (308).

7. A control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 6, is characterized in that: The air pump (303) has an air inlet connected to an air inlet pipe (309), and an air filter (310) is connected to the end of the air inlet pipe (309).

8. A control system for the temperature field change of ventilated frozen soil roadbed and foundation for cold energy storage in winter and release in summer, as described in claim 7, is characterized in that: The controller (308) has an automatic control module running inside, which includes a temperature acquisition unit, a data processing unit and a drive unit; The temperature acquisition unit collects frozen soil temperature data of the roadbed (1) through the first temperature sensor group (306) and collects ambient temperature data through the second temperature sensor group (307). The temperature acquisition unit sends the frozen soil temperature data and ambient temperature data to the data processing unit. The data processing unit processes the ambient temperature data and the frozen soil temperature data. The specific processing process is as follows: if the ambient temperature data is less than 0°C, a first driving signal is generated; if the frozen soil temperature data is greater than 0°C, a second driving signal is generated. After receiving the first driving signal, the driving unit starts the air pump (303) and blows outside cold air into the rectangular insulation pipe (302). After the refrigerant tank (305) is cooled, the refrigerant inside the refrigerant tank (305) solidifies and stores cold energy. After receiving the second driving signal, the driving unit starts the air pump (303) and blows outside air into the rectangular insulation pipe (302). After the outside air passes through the refrigerant tank (305) and releases cold energy to cool down, it enters the ventilation pipe (2) through the first air pipe (301) to cool the roadbed (1).

Images