Power type frost heaving heat accumulating self-protection device and subgrade thereof

Abstract

The embodiment of the application provides a power type frost heaving heat gathering self-protection device and a subgrade thereof, and relates to the technical field of seasonal frozen soil area engineering construction disease prevention and treatment. In the device, a solar heat absorber, a heat gathering pipe, a forward pump and a reverse pump are sequentially connected in a head-tail mode through a circulating pipe to form a circulating loop, the circulating loop is filled with a circulating working medium, the solar heat absorber is arranged outside the subgrade, the heat gathering pipe is inserted into the subgrade, the forward pump is used for driving the circulating working medium to flow in the circulating loop in a forward direction, and the reverse pump is used for driving the circulating working medium to flow in the circulating loop in a reverse direction, so that the circulating working medium in the solar heat absorber is exhausted. The device and the subgrade not only can realize balanced and flat heating of the subgrade, effectively avoid the generation of engineering diseases such as frost heaving and uneven undulation of the subgrade in the seasonal frozen soil area, but also can avoid the influence of the boiling point of the circulating working medium on the stability and sealing performance of the device in summer by controlling the position of the circulating working medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seasonal frozen soil area engineering construction disease prevention and treatment, in particular to a dynamic frost heaving heat accumulation self-protection device and subgrade thereof. BACKGROUND

[0002] The seasonal frozen soil area in China is about 513.7 million square kilometers, accounting for 53.5% of the land area. Seasonal frozen soil is affected by seasons, frozen in winter and completely thawed in summer. When the seasonal frozen layer and the seasonal thawing layer melt in summer, due to the uneven distribution of ice layers and ice lenses, uneven settlement of soil layers is formed, which is an important reason for the deformation and damage of various buildings. The frost heaving and thawing properties of seasonal frozen soil have a significant impact on engineering. Therefore, special attention should be paid to the influence of seasonal frozen soil on engineering and preventive measures in seasonal frozen soil areas. For subgrade, the main forms of subgrade frost damage are frost heaving, thawing, mud boiling and the like.

[0003] The Xigeg section of the Qinghai-Tibet Railway is located in the northeast of the Qinghai-Tibet Plateau, with an average elevation of 3220m. The railway line passes through the north shore of Qinghai Lake, an alluvial plain, and an ice plateau. The annual average precipitation is 376mm, and the precipitation is unevenly distributed, with most of it concentrated in July-September. The average annual temperature is -0.6℃, and the average temperature in January, the coldest month, is -20.6℃. The Xigeg section of the Qinghai-Tibet Railway is cold, with strong freezing capacity and large freezing depth, with a maximum freezing depth of 1.8m, belonging to a typical seasonal frozen soil area. The subgrade frost heaving and thawing caused by freezing and thawing are relatively serious.

[0004] In recent years, due to the increasing rainfall on the Qinghai-Tibet Plateau, the groundwater has become enriched and the groundwater level has risen, and the climate and environment have changed, leading to further increase of freeze-thaw engineering diseases in this area, which has an important influence on the long-term stability of the subgrade. Although some research has been carried out on the subgrade diseases in seasonal frozen soil areas under the action of engineering in the past, the research mainly focuses on the highway engineering or the working conditions of high-speed railways in the northeast and northwest regions, and the research on the development characteristics and distribution law of freeze-thaw engineering diseases under the special conditions of high water level, coarse filler and strong freeze-thaw in the Xigeg section of the Qinghai-Tibet Railway is still lacking. The methods commonly used in conventional areas, such as replacement of subgrade soil, construction of drainage facilities to reduce the water content of subgrade, inorganic binder stabilized soil heat preservation, artificial salinization of subgrade soil, chemical grouting and waterproof curtain, are difficult to meet the actual engineering needs due to the limitations of normal train operation and the difficulty of interrupting construction, as well as the cracking of the disposal site caused by the strong action of soil freezing and thawing and the difficulty of sealing the whole subgrade. Due to the weak research on the previous engineering measures for such engineering diseases, the engineering problems have long affected the stability and safety of the subgrade. SUMMARY

[0005] The purpose of the present application includes providing a power type frost heaving heat gathering self-protection device and subgrade, which can not only realize subgrade balance, flat heating, effectively avoid the generation of subgrade frost heaving, uneven undulation and other engineering diseases in seasonal frozen soil area, but also can avoid the influence of the boiling point of circulating working medium on the stability and sealing of the device in summer by controlling the position of the circulating working medium.

[0006] The embodiments of the present application can be implemented as follows:

[0007] In the first aspect, the present application provides a power type frost heaving heat gathering self-protection device, which comprises a solar heat absorber, a circulating pipe, a heat gathering pipe, a forward pump and a reverse pump. The solar heat absorber, the heat gathering pipe, the forward pump and the reverse pump are sequentially connected in a head-to-tail manner through the circulating pipe to form a circulating loop, and the circulating loop is filled with a circulating working medium. The solar heat absorber is used for being installed outside the subgrade, the heat gathering pipe is used for being inserted into the subgrade, the forward pump is used for driving the circulating working medium to flow in the circulating loop in a forward direction, and the reverse pump is used for driving the circulating working medium to flow in the circulating loop in a reverse direction, so that the circulating working medium in the solar heat absorber is exhausted.

[0008] In this way, during the working period of the device, the circulating working medium flows in the circulating pipe under the driving of the pressure generated by the operation of the forward pump, and the heat absorbed by the solar heat absorber is transmitted to the heat gathering pipe through the circulating working medium. The heat gathering pipe continuously releases heat in the interior of the subgrade, heats the soil body around the heat gathering pipe, and makes the subgrade always in a process of net heat absorption and internal heat accumulation. The heat gathering pipe achieves the purpose of preventing the occurrence of engineering diseases such as subgrade soil body freezing and subgrade frost heaving.

[0009] During the stop working period of the device, such as the summer period, the forward pump stops working. First, the circulating working medium flows back to the interior of the heat gathering pipe through the circulating pipe under the action of gravity, and the liquid level of the circulating working medium in the solar heat absorber starts to drop to the liquid level height of the device. Second, the reverse pump further exhausts the circulating working medium in the solar heat absorber, so that the circulating working medium flows back to the heat gathering pipe. In summer, the boiling and vaporization of the circulating working medium under the high temperature condition of the solar heat absorber during the day are avoided, so that the sealing, integrity and safety of the overall device are ensured.

[0010] In the optional embodiment, the circulating pipe comprises a forward circulating pipe and a non-return circulating pipe. The forward circulating pipe is used for connecting the solar heat absorber and the heat gathering pipe and connecting the heat gathering pipe and the forward pump in communication. The non-return circulating pipe is connected to one end of the solar heat absorber close to the forward pump, and the reverse pump is installed on the non-return circulating pipe.

[0011] In an optional embodiment, the non-return circulation pipe is an n-shaped pipe, and the non-return circulation pipe comprises a first vertical pipe, a horizontal pipe and a second vertical pipe connected in sequence, wherein the first vertical pipe is connected to the solar heat absorber, the second vertical pipe is connected to the forward pump, and the reverse pump is installed on the second vertical pipe.

[0012] In an optional embodiment, the height position of the horizontal pipe is L1, and the height position of the liquid surface of the solar heat absorber after the circulating working medium is exhausted is L2, and L1 is greater than or equal to L2.

[0013] In this way, the height position of the horizontal pipe is not lower than the height position of the liquid surface of the circulating working medium, so that the circulating working medium flowing back to the heat collecting pipe from the solar heat absorber can be prevented from flowing back to the solar heat absorber again through the horizontal pipe.

[0014] In an optional embodiment, the height position of the reverse pump is L3, and L2 is greater than or equal to L3.

[0015] In this way, the reverse pump is located below the height position of the liquid surface of the circulating working medium in any case, so that the two ends of the reverse pump can be prevented from being filled with the circulating working medium at any time, the reverse pump can be prevented from idling, and the stability and service life of the reverse pump can be improved.

[0016] In an optional embodiment, the gravity center height of the solar heat absorber, the gravity center height of the heat collecting pipe and the gravity center height of the forward pump are sequentially reduced.

[0017] In this way, when the device stops working, the circulating working medium in the solar heat absorber can flow out of the solar heat absorber as much as possible under the action of gravity and be stored in the heat collecting pipe.

[0018] In an optional embodiment, the solar heat absorber comprises a solar heat absorption plate and an upper header tank, a lower header tank and a discharge pipe installed below the solar heat absorption plate, the upper header tank and the lower header tank are connected to the two ends of the circulating pipe respectively, and the two ends of the discharge pipe are communicated with the upper header tank and the lower header tank respectively.

[0019] In an optional embodiment, the power type frost heaving heat collecting self-protection device further comprises a controller, the forward pump and the reverse pump are electrically connected to the controller, the controller is configured to control the reverse pump to stop working, the forward pump to drive the circulating working medium to flow in the circulating loop in a forward direction, and the controller is further configured to control the reverse pump to work for a second time length after the forward pump stops working for a first time length, so that the circulating working medium in the solar heat absorber is exhausted.

[0020] In a second aspect, the present application provides a power type frost heaving heat collecting self-protection roadbed, which comprises a roadbed and the power type frost heaving heat collecting self-protection device of any one of the preceding embodiments, wherein the solar heat absorber is installed outside the roadbed, and the heat collecting pipe is inserted into the inside of the roadbed.

[0021] In an alternative embodiment, the power-driven frost-heave heat-accumulation self-protective roadbed further comprises a heat-insulating material layer, which is arranged on the slope surface of the roadbed.

[0022] In this way, the entire device stops working under the condition of no solar radiation at night, and the heat-insulating material layer outside the roadbed effectively prevents the massive loss of heat inside the roadbed. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor under the premise of these drawings.

[0024] Figure 1 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective roadbed provided by the embodiments of the present application;

[0025] Figure 2 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application;

[0026] Figure 3 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application; Figure 2 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application;

[0027] Figure 4 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application;

[0028] Figure 5 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application;

[0029] Figure 6 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application;

[0030] Figure 7 The structural schematic diagram of the power-driven frost-heave heat-accumulation self-protective device provided by the embodiments of the present application.

[0031] Figure: 1 - power-driven frost-heave heat-accumulation self-protective roadbed; 2 - roadbed; 3 - heat-insulating material layer; 4 - anchor rod; 5 - power-driven frost-heave heat-accumulation self-protective device; 6 - solar heat absorber; 61 - solar heat absorption plate; 62 - upper header; 63 - lower header; 64 - row pipe; 7 - circulating pipe; 8 - forward circulating pipe; 9 - non-return circulating pipe; 91 - first vertical pipe; 92 - horizontal pipe; 93 - second vertical pipe; 10 - heat-accumulation pipe; 11 - outer pipe; 12 - liquid inlet pipe; 13 - liquid outlet pipe; 14 - forward pump; 15 - reverse pump; 16 - circulating working medium. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0038] The embodiments of the present application are proposed for the key technical problems in subgrade frost heaving, starting from the "subgrade temperature" in the three indispensable elements of "water, soil and temperature" generated by subgrade frost heaving, and achieving the purpose of controlling temperature and preventing and controlling subgrade frost heaving by setting the device provided in the embodiments of the present application.

[0039] Please refer to Figure 1 The present embodiment provides a power type frost heaving heat gathering self-protection subgrade 1, which comprises a subgrade 2, a heat preservation material layer 3 and a power type frost heaving heat gathering self-protection device 5, wherein the power type frost heaving heat gathering self-protection device 5 is uniformly installed on the sunny slope side or the shady slope side of the subgrade 2.

[0040] The insulation material layer 3 is installed on the slope of the roadbed 2, covering the entire slope, and is fixed by anchor bolts 4. In other embodiments, a thin layer of soil or other materials can be covered on the outer surface of the insulation material layer 3 to compact and fix it. The insulation material layer 3 can be made of building rock wool insulation material or integrated insulation board. Specifically, the insulation material layer 3 can be installed on both the sunny and shady slopes of the roadbed 2 to prevent heat loss from the interior of the roadbed 2 and effectively ensure the retention of heat inside the roadbed 2 during diurnal changes.

[0041] Please see Figure 1 and Figure 2 The dynamic frost heave and heat accumulation self-protection device 5 includes a solar absorber 6, a circulation pipe 7, a heat accumulation tube 10, a forward pump 14, and a reverse pump 15. The solar absorber 6, the heat accumulation tube 10, the forward pump 14, and the reverse pump 15 are connected end to end through the circulation pipe 7 to form a circulation loop. The circulation loop is filled with a circulating working fluid 16. Figure 3 (As shown), the circulating working fluid 16 is a refrigerant, glass cleaner, or other liquid that does not freeze at -30°C and has good fluidity. The circulating pipe 7 is a metal pipe or a non-metallic pipe that is resistant to outdoor solar radiation and aging.

[0042] The solar absorber 6 can be installed on the sunny side of the roadbed 2, near the natural surface area at the foot of the slope, or on the shady side of the roadbed 2, in a natural surface area where the sun can shine in winter. The solar absorber 6 is used to absorb solar energy and heat the circulating working fluid 16.

[0043] The heat-collecting pipe 10 is inserted into the roadbed 2 and transfers the heat of the circulating working medium 16 to the interior of the roadbed 2, so that the roadbed 2 is always in the process of net heat absorption and continuous accumulation of internal heat, so as to achieve the goal of heat collection inside the roadbed 2 and the temperature always being kept at a positive temperature, thereby achieving the purpose of preventing the occurrence of engineering diseases such as roadbed soil freezing and roadbed frost heave.

[0044] The heat-collecting pipe 10 is inserted into the roadbed 2 from the area between the half-slope and the toe of the slope, and the insertion direction is perpendicular to the length direction of the roadbed 2. The length of the heat-collecting pipe 10 can be determined according to the actual site conditions. On the slope surface of the same side of the roadbed 2, the distance between two adjacent heat-collecting pipes 10 can be 1m to 5m. The angle between the heat-collecting pipe 10 and the horizontal plane is in the range of -30° to 30°. In this embodiment, it is preferred that the angle of the heat-collecting pipe 10 rising from the inside of the roadbed outward in the length direction is 0° to 30°, specifically 5° to 10°. That is to say, if... Figure 1As shown, the heat collecting pipe 10 extends along the x direction and has an upward angle of 0°-30° along the y direction, so that the height of the heat collecting pipe 10 is located at the middle or lower position of the roadbed 2, and the heat collecting pipe 10 spans most of the width of the roadbed 2. In this way, the heat collecting pipe 10 is installed in the roadbed 2 conveniently, the drilling depth is small and the number is less, the original engineering structure of the roadbed 2 is not changed, the stability of the original roadbed 2 is ensured, the normal running of the train is not affected during the construction process, and the engineering construction problem under the condition of meeting the train running is effectively solved.

[0045] The gravity center height of the solar heat absorber 6, the gravity center height of the heat collecting pipe 10 and the gravity center height of the forward pump 14 are sequentially reduced. In this way, when the device stops working, the circulating working medium 16 in the solar heat absorber 6 will flow out of the solar heat absorber 6 as much as possible under the action of gravity and be stored in the heat collecting pipe 10.

[0046] Please refer to Figure 3 , the heat collecting pipe 10 includes an outer pipe 11, an inlet pipe 12 and an outlet pipe 13, wherein the inlet pipe 12 is connected to the outside of the outer pipe 11 and communicates with one end of the circulating pipe 7. The outlet pipe 13 is located at the bottom of the outer pipe 11, one end of the outlet pipe 13 is inserted into the inside of the outer pipe 11 and is provided with an opening communicating with the outer pipe 11, and the other end of the outlet pipe 13 extends out of the outer pipe 11 and communicates with the other end of the circulating pipe 7. In this way, the outer pipe 11 and the outlet pipe 13 form a heat release flow channel for the circulating working medium 16 and make the circulating working medium 16 radiate heat in the heat release flow channel, not only the heat release flow channel is long, but also the heat transfer medium is only the pipe wall of the outer pipe 11, so the heat transfer efficiency is high. The design of the inlet pipe 12 and the outlet pipe 13 enables the circulating working medium 16 to fill the heat collecting pipe 10, so that the heat exchange between the circulating working medium 16 and the pipe wall is more sufficient, and the heating efficiency of the heat collecting pipe 10 on the roadbed is improved.

[0047] Please refer to Figure 4 , Figure 4 The arrow in the middle indicates the flow direction of the circulating working medium 16, and the solar heat absorber 6 includes a solar heat absorbing plate 61 and an upper header 62, a lower header 63 and a discharge pipe 64 installed below the solar heat absorbing plate 61.

[0048] The solar heat absorbing plate 61 is mainly made of metal or non-metal heat absorbing material, and has a relatively thin thickness, which can be 1mm-3mm. The upper header 62 and the lower header 63 are respectively connected to the two ends of the circulating pipe 7, and the discharge pipe 64 is a metal pipe with a circular cross section, and the two ends of the discharge pipe 64 respectively communicate with the upper header 62 and the lower header 63.

[0049] The circulating pipe 7 includes a forward circulating pipe 8 and a check circulating pipe 9, the forward circulating pipe 8 is used to communicate between the solar heat absorber 6 and the heat collecting pipe 10 and between the heat collecting pipe 10 and the forward pump 14, and the check circulating pipe 9 is connected to one end of the solar heat absorber 6 close to the forward pump 14.

[0050] The reverse circulation pipe 9 is an n-shaped pipe, and the reverse circulation pipe 9 comprises a first vertical pipe 91, a horizontal pipe 92 and a second vertical pipe 93 which are sequentially communicated, wherein the first vertical pipe 91 is communicated on the solar heat absorber 6, the second vertical pipe 93 is communicated to the forward pump 14, and the reverse pump 15 is installed on the second vertical pipe 93.

[0051] The height position of the horizontal pipe 92 is L1, the liquid level height position of the solar heat absorber 6 after the circulating working medium 16 is emptied is L2, and the height position of the reverse pump 15 is L3, so L1≥L2≥L3. In this way, the height position of the horizontal pipe 92 is not lower than the liquid level height of the circulating working medium 16, so that the circulating working medium 16 which flows back to the solar heat absorber 6 from the heat collecting pipe 10 through the horizontal pipe 92 is prevented. The reverse pump 15 is always below the liquid level height of the circulating working medium 16 in any case, so that the two ends of the reverse pump 15 are not filled with the circulating working medium 16 at any time, the reverse pump 15 is prevented from idling, and the stability and service life of the reverse pump 15 are improved.

[0052] The power type frost heaving heat collecting self-protection device 5 further comprises a controller (not shown in the figure), the forward pump 14 and the reverse pump 15 are electrically connected with the controller, the controller is used for controlling the reverse pump 15 to stop working, the forward pump 14 to drive the circulating working medium 16 to flow in the circulation loop in the forward direction, and is further used for controlling the reverse pump 15 to work for a second time length after the forward pump 14 stops working for a first time length, so as to empty the circulating working medium 16 in the solar heat absorber 6. The first time length can be 3min-5min, and the second time length can be 1min-3min.

[0053] The working principle of the power type frost heaving heat collecting self-protection device and the roadbed thereof provided in the embodiment is as follows:

[0054] Please refer to Figure 4 When the device works, the circulating working medium 16 flows in the circulation pipe 7 under the driving of the pressure generated by the operation of the forward pump 14, the heat absorbed by the solar heat absorber 6 is transferred to the heat collecting pipe 10 through the circulating working medium 16, the heat collecting pipe 10 continuously releases heat in the inside of the roadbed, the soil around the heat collecting pipe 10 is heated, the roadbed is always in the process of net heat absorption and internal heat accumulation, the heat is collected in the inside of the roadbed and the temperature is always kept positive, so the purpose of preventing the occurrence of engineering diseases such as freezing of the roadbed soil and frost heaving of the roadbed is achieved.

[0055] Please refer to Figure 5 In the summer period, the forward pump 14 stops working, firstly, the circulating working medium 16 flows back to the inside of the heat collecting pipe 10 through the circulation pipe 7 under the action of gravity, the liquid level of the circulating working medium 16 in the solar heat absorber 6 starts to drop, and drops to the liquid level height of the device, secondly, please refer to Figure 6, the reverse pump 15 starts to work, further empties the circulating working medium 16 in the solar heat absorber 6, and makes the circulating working medium 16 backflow to the heat collecting pipe 10. After the reverse pump 15 stops working, as shown in Figure 7 Fig. 13, the liquid level L2 of the circulating working medium 16 is higher than the height L1 of the reverse pump 15 and does not exceed the height of the transverse pipe 92. In summer, the boiling and vaporization of the circulating working medium 16 under the high-temperature condition of the solar heat absorber 6 in the daytime is avoided, so that the sealing, integrity and safety of the overall device are ensured.

[0056] The power type frost heaving heat collecting self-protection device and the roadbed thereof provided by the embodiment have the following beneficial effects:

[0057] 1. The heat absorbed by the solar heat absorber 6 is transmitted to the heat collecting pipe 10 through the circulating working medium 16, and the heat collecting pipe 10 continuously releases heat in the inside of the roadbed, heats the soil around the heat collecting pipe 10, and makes the roadbed always in the process of net heat absorption and internal heat accumulation, so that the heat collection in the inside of the roadbed and the positive temperature state of the temperature are achieved, thereby achieving the purpose of preventing the occurrence of engineering diseases such as roadbed soil freezing and roadbed frost heaving.

[0058] 2. By arranging the reverse pump 15, the circulating working medium 16 can be discharged from the solar heat absorber 6, so that the problem of the increase of the pressure of the device caused by the boiling and vaporization of the circulating working medium 16 endangering the sealing, integrity of the device is avoided, and the stability of the device in the roadbed heating in the seasonally frozen ground area is enhanced, thereby better preventing and controlling the roadbed frost heaving.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, and should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power type frost heave heat accumulation self-protection device, characterized in that, The power type frost heaving and heat gathering self-protection device comprises a solar heat absorber (6), a circulating pipe (7), a heat gathering pipe (10), a forward pump (14) and a reverse pump (15), wherein the solar heat absorber (6), the heat gathering pipe (10), the forward pump (14) and the reverse pump (15) are sequentially and circularly connected through the circulating pipe (7), a circulating loop is formed, the circulating loop is filled with a circulating working medium (16), the solar heat absorber (6) is arranged outside a roadbed (2), the heat gathering pipe (10) is inserted into the roadbed (2), the forward pump (14) is used for pushing the circulating working medium (16) to flow in the circulating loop in a forward direction, and the reverse pump (15) is used for pushing the circulating working medium (16) to flow in the circulating loop in a reverse direction, so that the circulating working medium (16) in the solar heat absorber (6) is emptied. The circulating pipe (7) comprises a forward circulating pipe (8) and a non-return circulating pipe (9), the forward circulating pipe (8) is used for connecting the solar heat absorber (6) and the heat gathering pipe (10) and connecting the heat gathering pipe (10) and the forward pump (14), and the non-return circulating pipe (9) is connected to one end of the solar heat absorber (6) close to the forward pump (14), and the reverse pump (15) is arranged on the non-return circulating pipe (9). The non-return circulating pipe (9) is an n-shaped pipe, and the non-return circulating pipe (9) comprises a first vertical pipe (91), a horizontal pipe (92) and a second vertical pipe (93) which are sequentially connected, wherein the first vertical pipe (91) is connected to the solar heat absorber (6), the second vertical pipe (93) is connected to the forward pump (14), and the reverse pump (15) is arranged on the second vertical pipe (93). The height position of the horizontal pipe (92) is L1, the liquid level height position of the solar heat absorber (6) after the circulating working medium (16) is emptied is L2, and L1 is greater than or equal to L2. The height position of the reverse pump (15) is L3, and L2 is greater than or equal to L3. The gravity center height of the solar heat absorber (6), the gravity center height of the heat gathering pipe (10) and the gravity center height of the forward pump (14) are sequentially reduced. The power type frost heaving and heat gathering self-protection device further comprises a controller, the forward pump (14) and the reverse pump (15) are electrically connected with the controller, the controller is used for controlling the reverse pump (15) to stop working, the forward pump (14) to push the circulating working medium (16) to flow in the circulating loop in a forward direction, and the reverse pump (15) to work for a second time length after the forward pump (14) stops working for a first time length, so that the circulating working medium (16) in the solar heat absorber (6) is emptied.

2. The power-type frost heaving heat-emitting self-protection device according to claim 1, characterized by, The solar heat absorber (6) comprises a solar heat absorption plate (61) and an upper header (62), a lower header (63) and a discharge pipe (64) installed below the solar heat absorption plate (61), the upper header (62) and the lower header (63) are connected to two ends of the circulating pipe (7) respectively, and two ends of the discharge pipe (64) are communicated with the upper header (62) and the lower header (63) respectively.

3. A power type frost heaving and heat accumulating self-protecting roadbed, characterized by, The power type frost heaving heat gathering self-protection roadbed comprises a roadbed (2) and the power type frost heaving heat gathering self-protection device of any one of claims 1 and 2, wherein the solar heat absorber (6) is installed outside the roadbed (2), and the heat gathering pipe (10) is inserted into the inside of the roadbed (2).

4. The power type frost heaving and heat accumulating self-protection subgrade according to claim 3, characterized in that, The power type frost heaving heat gathering self-protection roadbed further comprises a heat preservation material layer (3) arranged on the slope surface of the roadbed (2).

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