Telescopic anti-freezing and heat-accumulating self-protection device and roadbed thereof

Abstract

The present invention provides a telescopic anti-frost heave heat collection self-protection device and its roadbed, which relates to the technical field of engineering construction disease prevention and control in seasonal frozen soil areas. In the device, a solar thermal absorber, a heat collection pipe and a circulation pump are connected end to end in sequence through a circulation pipe to form a circulation loop, and the circulation loop is filled with a circulating medium. The heat collection pipe is used to be inserted into the roadbed. In the solar thermal absorber, the liquid inlet joint and the liquid outlet joint are respectively installed at the lower part and the upper part of the shell, and are respectively connected to the two ends of the circulation pipe. The liquid inlet joint, the circulation hose, the telescopic pipe and the liquid outlet joint are connected in sequence. The solar thermal absorption plate is connected above the telescopic pipe, and the telescopic pipe can be extended and retracted along the height direction of the shell. The device can not only achieve balanced and smooth heating of the roadbed, effectively avoiding the occurrence of engineering diseases such as frost heave and uneven undulation of the roadbed in seasonal frozen soil areas, but also can automatically empty the circulating medium in the solar thermal absorber to prevent the circulating medium from reaching the boiling point in summer and affecting the stability and sealing of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of disease prevention and control in seasonal frozen soil areas, and in particular to a telescopic anti-freeze expansion heat-accumulating self-protection device and a roadbed thereof. Background Art

[0002] my country's seasonally frozen ground covers approximately 5.137 million square kilometers, accounting for 53.5% of the country's land area. Seasonally frozen ground is affected by seasonal factors, freezing in winter and completely thawing in summer. When the seasonally frozen and thawed layers melt in summer, the uneven distribution of ice layers and ice lenses causes uneven soil settlement, a major cause of deformation and damage to various buildings. The frost heave and thaw settlement properties of seasonally frozen ground have significant impacts on engineering projects. Therefore, construction projects in seasonally frozen ground areas should pay special attention to the impact of seasonally frozen ground on their projects and take preventative measures. For roadbeds, frost damage primarily occurs in the form of frost heave, thaw settlement, and mud oozing.

[0003] The Xige section of the Qinghai-Tibet Railway is located in the northeastern part of the Qinghai-Tibet Plateau. The railway line traverses the coastal plain, alluvial plain, and glacial plateau along the northern shore of Qinghai Lake, with an average elevation of 3,220 meters. Annual precipitation averages 376 mm, with uneven distribution, most of it concentrated between July and September. The average annual temperature is -0.6°C, with the coldest month, January, reaching an average temperature of -20.6°C. The Xige section of the Qinghai-Tibet Railway experiences a cold climate with a strong freezing point and deep freeze, reaching a maximum depth of 1.8 meters. This section is a typical seasonal permafrost zone. Consequently, roadbed engineering problems such as frost heave and thaw settlement caused by freezing and thawing are relatively severe.

[0004] In recent years, increasing rainfall on the Qinghai-Tibet Plateau has led to groundwater enrichment and rising water tables. This, coupled with intensified climate change, has led to a further increase in freeze-thaw engineering hazards in these regions, significantly impacting the long-term stability of roadbeds. While previous research has examined roadbed hazards under engineering conditions in seasonally frozen soil regions, this research has primarily focused on the effects and impacts of micro-frost heave on roadbeds under highway construction or high-speed railway conditions in regions like Northeast and Northwest China. However, little research has been conducted on the development and distribution of freeze-thaw engineering hazards under the unique conditions of high water levels, coarse fill materials, and intense freeze-thaw cycles in the Xige section of the Qinghai-Tibet Railway. Conventional methods such as replacing subgrade soil, constructing drainage systems to reduce subgrade moisture content, using inorganic binders to stabilize soil for insulation, artificially salinizing subgrade soil, chemical grouting, and waterproofing curtains are inadequate for practical engineering applications in this region due to limitations in engineering conditions such as normal train operation and the need to maintain construction interruptions. Furthermore, the intense freeze-thaw cycles can lead to cracking in the treated areas and the difficulty of fully sealing the subgrade. Since previous research on engineering measures to remediate such engineering defects was relatively weak, engineering problems have long affected roadbed stability and operational safety. Summary of the Invention

[0005] The purpose of the present invention includes providing a telescopic anti-frost heave heat-collecting self-protection device and its roadbed, which can not only achieve balanced and smooth heating of the roadbed, effectively avoiding the occurrence of engineering diseases such as frost heave and uneven undulation of the roadbed in seasonal frozen soil areas, but also can automatically empty the circulating working fluid in the solar thermal absorber to avoid the circulating working fluid reaching the boiling point in summer and affecting the stability and sealing of the device.

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

[0007] In a first aspect, the present invention provides a telescopic anti-freeze heave heat-collecting self-protection device, comprising a solar heat absorber, a circulation pipe, a heat-collecting pipe, and a circulation pump. The solar heat absorber, the heat-collecting pipe, and the circulation pump are sequentially connected end to end through the circulation pipe to form a circulation loop. The circulation loop is filled with a circulating working medium. The heat-collecting pipe is used to be inserted into a roadbed.

[0008] The solar thermal absorber includes a shell, a liquid inlet joint, a circulation hose, a telescopic tube, a liquid outlet joint and a solar thermal absorption plate. The liquid inlet joint is installed at the lower part of the shell, and the liquid outlet joint is installed at the upper part of the shell. The liquid inlet joint and the liquid outlet joint are respectively connected to the two ends of the circulation pipe. The liquid inlet joint, the circulation hose, the telescopic tube and the liquid outlet joint are connected in sequence. The solar thermal absorption plate is connected above the telescopic tube, and the telescopic tube can be extended and retracted along the height direction of the shell.

[0009] In this way, during the working period of the device, the circulating medium circulates in the circulating pipe driven by the pressure generated by the operation of the circulating pump, and the heat absorbed by the solar thermal absorber is transferred to the heat collection pipe through the circulating medium. The heat is continuously released through the heat collection pipe inside the roadbed, heating the soil around the heat collection pipe, so that the roadbed is always in a process of net heat absorption and continuous accumulation of internal heat, so that the heat inside the roadbed is always maintained at a positive temperature, thereby achieving the purpose of preventing and controlling engineering diseases such as freezing of the roadbed soil and frost heave of the roadbed. Corresponding to the telescopic tube, under the action of its own gravity and the gravity of the circulating medium, the telescopic tube extends downward to the bottom of the shell.

[0010] During the period when the device stops working, such as in the summer, the circulation pump stops working. First, the circulating working fluid flows back to the inside of the heat collecting pipe through the circulation pipe under the action of gravity. The circulating working fluid in the solar thermal absorber begins to decrease, and the telescopic pipe begins to shrink upward. As the telescopic pipe moves upward, the circulating working fluid in the telescopic pipe gradually and completely flows back to the heat collecting pipe. In the summer, the boiling and vaporization of the circulating working fluid under the high temperature conditions of the solar thermal absorber during the day, which causes a sharp increase in the pressure of the entire device, thereby ensuring the sealing, integrity and safety of the entire device.

[0011] In an optional embodiment, when the circulating working medium fills the telescopic tube, the telescopic tube extends to a maximum length along the height direction of the shell; when the circulating working medium in the telescopic tube is emptied, the telescopic tube contracts to a minimum length along the height direction of the shell.

[0012] In an optional embodiment, when the telescopic tube is contracted to a minimum length, the lower end of the telescopic tube is located higher than the outlet of the heat collecting tube.

[0013] In this way, when the device stops working, the circulating working medium in the heat collecting pipe will not automatically flow back into the telescopic pipe, thereby preventing the solar thermal absorber from continuously absorbing heat.

[0014] In an optional embodiment, the telescopic tube is an S-shaped pipe.

[0015] In an optional embodiment, the telescopic tube includes multiple horizontal segments and multiple arc segments, the horizontal segments and the arc segments are alternately connected in sequence, the horizontal segments are parallel to the width direction of the shell, and the arc segments can be telescoped along the height direction of the shell.

[0016] In this way, the telescopic tube has a simple structure and a large telescopic range, which facilitates complete discharge of the circulating working medium in the telescopic tube.

[0017] In an optional embodiment, the solar heat absorbing panel is a rectangular structure, each horizontal segment is connected to a solar heat absorbing panel, and the solar heat absorbing panel can move with the horizontal segment.

[0018] In this way, no matter how long the telescopic tube is extended or retracted, each horizontal section can be heated by the solar heat absorbing plate, thereby ensuring the heat absorption efficiency of the solar heat absorber.

[0019] In an optional embodiment, two adjacent solar heat absorbing panels are arranged in parallel and spaced apart, and the solar heat absorbing panels are arranged obliquely relative to the height direction of the shell.

[0020] In this way, during the contraction of the telescopic tube, adjacent solar heat absorbing panels will automatically overlap when approaching each other, avoiding collision between adjacent solar heat absorbing panels and conflict between adjacent solar heat absorbing panels, thereby limiting the degree of contraction of the telescopic tube.

[0021] In an optional embodiment, the center of gravity height of the solar thermal absorber, the center of gravity height of the heat collecting pipe, and the center of gravity height of the circulation pump are reduced in sequence.

[0022] In this way, when the device stops working, the circulating working fluid in the solar thermal absorber will flow out of the solar thermal absorber as much as possible under the action of gravity and be stored in the heat collection pipe.

[0023] In the second aspect, the present invention provides a telescopic anti-frost heave heat-collecting self-protection roadbed, which includes a roadbed and a telescopic anti-frost heave heat-collecting self-protection device according to any one of the aforementioned embodiments, wherein a solar thermal absorber is installed on the outside of the roadbed and a heat-collecting pipe is inserted into the inside of the roadbed.

[0024] In an optional embodiment, the telescopic anti-freeze expansion heat-collecting self-protection roadbed further includes a thermal insulation material layer, which is arranged on the slope surface of the roadbed.

[0025] In this way, when there is no solar radiation at night, the entire device stops working, and at the same time, the thermal insulation material layer on the outside of the roadbed effectively prevents a large amount of heat from being lost from the inside of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic structural diagram of a telescopic anti-freeze heave heat-collecting self-protection roadbed provided in an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a telescopic anti-freeze heave heat-collecting self-protection device provided in an embodiment of the present invention;

[0029] Figure 3 for Figure 2 Schematic diagram of the structure of the central heat pipe;

[0030] Figure 4 This is a schematic diagram of the telescopic anti-freeze expansion heat accumulation self-protection working state;

[0031] Figure 5 for Figure 4 Side view of the solar thermal absorber;

[0032] Figure 6 This is a schematic diagram of the state of the telescopic anti-freeze expansion heat accumulation self-protection device when it stops working;

[0033] Figure 7 for Figure 6 Side view of the solar thermal absorber.

[0034] Icons: 1-telescopic anti-frost heave heat-gathering self-protection roadbed; 2-roadbed; 3-insulation material layer; 4-anchor rod; 5-telescopic anti-frost heave heat-gathering self-protection device; 6-solar heat absorber; 7-shell; 8-liquid inlet joint; 9-circulation hose; 10-telescopic pipe; 11-horizontal section; 12-arc section; 13-liquid outlet joint; 14-solar heat absorbing plate; 15-circulation pipe; 16-heat-gathering pipe; 17-outer pipe; 18-liquid inlet pipe; 19-liquid outlet pipe; 20-circulation pump; 21-circulating working medium. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0040] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0041] The embodiments of the present invention are proposed to address the key scientific and technological issues in roadbed frost heaving. Starting from the "roadbed temperature" among the three indispensable elements of "water, soil, and temperature" that cause roadbed frost heaving, the purpose of controlling temperature and preventing and controlling roadbed frost heaving is achieved by setting the device provided by the embodiments of the present invention.

[0042] Please refer to Figure 1 This embodiment provides a telescopic anti-frost heaving and heat-gathering self-protection roadbed 1, which includes a roadbed 2, an insulation material layer 3 and a telescopic anti-frost heaving and heat-gathering self-protection device 5, wherein the telescopic anti-frost heaving and heat-gathering self-protection device 5 is evenly installed on the sunny slope side or the shady slope side of the roadbed 2.

[0043] The thermal insulation material layer 3 is provided on the slope surface of the roadbed 2, can cover the entire slope surface of the roadbed 2, and is fixed by anchor rods 4. In other embodiments, the thermal insulation material layer 3 can also be compacted and fixed by covering the outer surface of the thermal insulation material layer 3 with a thin layer of soil or other materials. The thermal insulation material layer 3 can be made of building rock wool insulation material or an integrated thermal insulation board. Specifically, the thermal insulation material layer 3 can be provided on both the sunny and shady slopes of the roadbed 2, which can prevent the heat loss inside the roadbed 2 and effectively ensure the retention of heat inside the roadbed 2 during the change of day and night.

[0044] See also Figure 1 and Figure 2 The telescopic anti-freeze heave heat collection self-protection device 5 includes a solar heat absorber 6, a circulation pipe 15, a heat collection pipe 16, and a circulation pump 20. The solar heat absorber 6, the heat collection pipe 16, and the circulation pump 20 are connected end-to-end via the circulation pipe 15 to form a circulation loop. The circulation loop is filled with a circulating medium 21. The circulating medium 21 is a refrigerant, glass water, or other liquid that does not freeze at -30°C and has good fluidity. The circulation pipe 15 is a metal pipe or a non-metallic pipe that is resistant to outdoor solar radiation and aging.

[0045] The solar heat absorber 6 can be set 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 the natural surface area where the sun can shine in winter. The solar heat absorber 6 is used to absorb solar energy and heat the circulating working medium 21.

[0046] The heat collecting pipe 16 is used to be inserted into the roadbed 2 and transfer the heat of the circulating working medium 21 to the interior of the roadbed 2, so that the roadbed 2 is always in a process of net heat absorption and internal heat accumulation, so that the heat inside the roadbed 2 is always maintained at a positive temperature, thereby achieving the purpose of preventing and controlling the freezing of the roadbed 2 soil, frost heave of the roadbed 2 and other engineering diseases.

[0047] The heat collecting pipe 16 is inserted into the roadbed 2 from the range between the half slope and the slope foot of the roadbed 2, and the insertion direction is perpendicular to the length direction of the roadbed 2. The length of the heat collecting pipe 16 can be determined according to the actual conditions on site. On the slope surface on the same side of the roadbed 2, the spacing between two adjacent heat collecting pipes 16 can be 1m to 5m. The angle between the heat collecting pipe 16 and the horizontal plane is in the range of -30° to 30°. In this embodiment, the angle of the heat collecting pipe 16 raised from the inside of the roadbed 2 to the outside in the length direction is preferably 0° to 30°, specifically 5° to 10°, that is, Figure 1 As shown, the heat collection pipe 16 extends along the x-direction and has an elevation angle of 0° to 30° along the y-direction, placing the heat collection pipe 16 at the lower-middle position of the roadbed 2 and spanning most of the width of the roadbed 2. This facilitates installation of the heat collection pipe 16 within the roadbed 2, requires minimal drilling depth, and requires only a small number of holes. This maintains the stability of the existing roadbed 2 and does not affect the normal operation of trains during the construction process, effectively resolving the challenge of maintaining adequate construction conditions for train operation.

[0048] The center of gravity heights of the solar thermal absorber 6, the center of gravity heights of the heat collecting pipe 16, and the center of gravity heights of the circulation pump 20 are successively lowered. Thus, when the device stops working, the circulating working medium 21 in the solar thermal absorber 6 will flow out of the solar thermal absorber 6 as much as possible under the action of gravity and be stored in the heat collecting pipe 16 or the circulation pump 20.

[0049] See also Figure 3 The heat collecting pipe 16 includes an outer pipe 17, a liquid inlet pipe 18, and a liquid outlet pipe 19. The liquid inlet pipe 18 is connected to the outside of the outer pipe 17 and to one end of the circulation pipe 15. The liquid outlet pipe 19 is located at the bottom of the outer pipe 17. One end of the liquid outlet pipe 19 is inserted into the interior of the outer pipe 17 and has an opening that connects to the outer pipe 17. The other end of the liquid outlet pipe 19 extends out of the outer pipe 17 and connects to the other end of the circulation pipe 15. This creates a heat dissipation channel for the circulating medium 21 between the outer pipe 17 and the liquid outlet pipe 19, allowing the circulating medium 21 to dissipate heat within this heat dissipation channel. Not only is the heat dissipation channel longer, but the heat transfer medium only passes through the wall of the outer pipe 17, resulting in high heat transfer efficiency. The design of the liquid inlet pipe 18 and the liquid outlet pipe 19 allows the circulating medium 21 to fill the heat collecting pipe 16, allowing for more complete heat exchange between the circulating medium 21 and the pipe wall, thereby improving the heating efficiency of the heat collecting pipe 16 on the roadbed.

[0050] See also Figure 4 and Figure 5 , Figure 4The middle arrow indicates the flow direction of the circulating working medium 21. The solar thermal absorber 6 includes a shell 7, a liquid inlet joint 8, a circulation hose 9, a telescopic tube 10, a liquid outlet joint 13 and a solar thermal absorption plate 14. The liquid inlet joint 8 is installed at the lower part of the shell 7, and the liquid outlet joint 13 is installed at the upper part of the shell 7. The liquid inlet joint 8 and the liquid outlet joint 13 are respectively connected to the two ends of the circulation pipe 15. The liquid inlet joint 8, the circulation hose 9, the telescopic tube 10, and the liquid outlet joint 13 are connected in sequence. The solar thermal absorption plate 14 is bonded or welded to the top of the telescopic tube 10.

[0051] The telescopic tube 10 can be extended and retracted along the height direction of the housing 7. In other words, the telescopic tube 10 can be extended and retracted along the height direction of the housing 7. Figure 4 The back plate of the housing 7 guides the telescopic tube 10 , or a separate limit plate can be provided to guide the telescopic tube 10 .

[0052] When the telescopic tube 10 is fully filled with the circulating fluid 21, the telescopic tube 10 extends to its maximum length along the height of the housing 7. When the circulating fluid 21 is exhausted from the telescopic tube 10, the telescopic tube 10 contracts to its minimum length along the height of the housing 7. Furthermore, when the telescopic tube 10 is contracted to its minimum length, the lower end of the telescopic tube 10 is higher than the outlet of the heat collecting tube 16. This prevents the circulating fluid 21 in the heat collecting tube 16 from automatically flowing back into the telescopic tube 10 during periods of inactivity, preventing the solar thermal absorber 6 from continuously absorbing heat. Furthermore, when the telescopic tube 10 is fully filled with the circulating fluid 21, the upward contraction force of the telescopic tube 10 should be less than the weight of the circulating fluid 21 within the telescopic tube 10, ensuring that the telescopic tube 10 effectively empties the circulating fluid 21.

[0053] Specifically, the telescopic tube 10 is an S-shaped pipe. Alternatively, the telescopic tube 10 includes a plurality of horizontal sections 11 and a plurality of arc sections 12, the horizontal sections 11 and the arc sections 12 are alternately connected in sequence, the horizontal sections 11 are parallel to the width direction of the shell 7, and the arc sections 12 can be extended and retracted along the height direction of the shell 7, that is, the horizontal sections 11 are parallel to the width direction of the shell 7. Figure 4 In the x1 direction, the arc segment 12 can be extended and retracted along the y1 direction. In this way, the telescopic tube 10 has a simple structure and a large extension range, which facilitates the complete discharge of the circulating working medium 21 in the telescopic tube 10.

[0054] In this embodiment, the telescopic tube 10 can be directly made of an elastic material, or a spring can be arranged in the shell 7, the upper end of the spring is connected to the upper part of the shell 7, and the lower end of the spring is connected to the lower end of the telescopic tube 10. The spring maintains an elastic force to pull the lower end of the telescopic tube 10 upward.

[0055] The solar heat absorbing panels 14 are rectangular in structure, one attached or welded to each horizontal segment 11. These panels 14 are movable with the horizontal segments 11. This ensures that, regardless of the extent to which the telescopic tube 10 is extended, each horizontal segment 11 is heated by the solar heat absorbing panels 14, ensuring the heat absorption efficiency of the solar heat absorber 6. The solar heat absorbing panels 14 are primarily made of a metal or non-metallic heat-absorbing material and are relatively thin, specifically ranging from 1 mm to 3 mm.

[0056] Two adjacent solar heat absorbing panels 14 are arranged in parallel and spaced apart, and the solar heat absorbing panels 14 are arranged in an inclined manner relative to the height direction of the housing 7. Figure 6 and Figure 7 During the contraction of the telescopic tube 10, adjacent solar heat absorbing panels 14 will automatically overlap when approaching each other, avoiding collision between adjacent solar heat absorbing panels 14 and conflict between adjacent solar heat absorbing panels 14, thereby limiting the degree of contraction of the telescopic tube 10.

[0057] The working principle of the telescopic anti-freeze expansion heat accumulation self-protection device 5 and its roadbed provided in this embodiment is as follows:

[0058] See also Figure 4 and Figure 5 During the working period of the device, the circulating medium 21 circulates in the circulating pipe 15 driven by the pressure generated by the operation of the circulating pump 20. The heat absorbed by the solar thermal absorber 6 is transferred to the heat collection pipe 16 through the circulating medium 21. The heat is continuously released inside the roadbed through the heat collection pipe 16, heating the soil around the heat collection pipe 16, so that the roadbed is always in a process of net heat absorption and internal heat accumulation, so that the heat inside the roadbed is always maintained at a positive temperature, thereby achieving the purpose of preventing and controlling engineering diseases such as roadbed soil freezing and roadbed frost heave. Corresponding to the telescopic tube 10, under the action of its own gravity and the gravity of the circulating medium 21, the telescopic tube 10 extends downward to the bottom of the shell 7.

[0059] See also Figure 6 and Figure 7 When the device stops working, such as in the summer, the circulation pump 20 stops working. First, the circulating working medium 21 flows back to the inside of the heat collecting pipe 16 through the circulation pipe 15 under the action of gravity. The circulating working medium 21 in the solar thermal absorber 6 begins to decrease, and the telescopic pipe 10 begins to shrink upward. As the telescopic pipe 10 moves upward, the circulating working medium 21 in the telescopic pipe 10 gradually and completely flows back to the heat collecting pipe 16. In the summer, the boiling and vaporization of the circulating working medium 21 under the high temperature conditions of the solar thermal absorber 6 during the daytime, which causes a sharp increase in the pressure of the entire device, is avoided, thereby ensuring the sealing, integrity and safety of the entire device.

[0060] The beneficial effects of the telescopic anti-freeze expansion heat accumulation self-protection device 5 and the roadbed thereof provided in this embodiment include:

[0061] 1. The heat absorbed by the solar thermal absorber 6 is transferred to the heat collecting pipe 16 through the circulating working medium 21. The heat is continuously released inside the roadbed through the heat collecting pipe 16, heating the soil around the heat collecting pipe 16. The roadbed is always in a process of net heat absorption and internal heat accumulation. The heat is accumulated inside the roadbed and the temperature is always maintained at a positive state, thereby achieving the purpose of preventing and controlling engineering diseases such as roadbed soil freezing and roadbed frost heave.

[0062] 2. By setting a telescopic tube 10 in the solar thermal absorber 6, when the device stops working, the telescopic tube 10 can automatically empty the circulating working medium 21, thereby avoiding the boiling and vaporization of the circulating working medium 21, which causes the pressure of the device to increase and endangers the sealing and integrity of the device. The stability of the device in roadbed heating in seasonal frozen soil areas is enhanced, thereby better preventing and controlling roadbed frost heave.

[0063] 3. The telescopic tube 10 can be made of a pipe or a spring made of elastic material to achieve the purpose of the device. The device is simple, practical and has good stability, but it can better solve the technical and scientific problems of device stability.

[0064] 4. For scenarios where the roadbed height is limited, this device can fully guarantee the efficiency of the solar thermal absorber 6 as well as the long-term stability and safety of the device.

[0065] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A telescopic anti-freeze expansion heat-collecting self-protection device, characterized in that: The telescopic anti-freezing and heat-collecting self-protection device comprises a solar heat absorber (6), a circulation pipe (15), a heat-collecting pipe (16) and a circulation pump (20); the solar heat absorber (6), the heat-collecting pipe (16) and the circulation pump (20) are connected end to end in sequence through the circulation pipe (15) to form a circulation loop; the circulation loop is filled with a circulating medium (21); the heat-collecting pipe (16) is used to be inserted into the roadbed (2); The solar heat absorber (6) comprises a shell (7), a liquid inlet joint (8), a circulation hose (9), a telescopic pipe (10), a liquid outlet joint (13) and a solar heat absorbing plate (14); the liquid inlet joint (8) is mounted on the lower part of the shell (7); the liquid outlet joint (13) is mounted on the upper part of the shell (7); the liquid inlet joint (8) and the liquid outlet joint (13) are respectively connected to the two ends of the circulation pipe (15); the liquid inlet joint (8), the circulation hose (9), the telescopic pipe (10) and the liquid outlet joint (13) are sequentially connected; the solar heat absorbing plate (14) is connected above the telescopic pipe (10); and the telescopic pipe (10) can be telescoped along the height direction of the shell (7); When the circulating working medium (21) fills the telescopic tube (10), the telescopic tube (10) extends to the maximum length along the height direction of the shell (7); when the circulating working medium (21) in the telescopic tube (10) is emptied, the telescopic tube (10) contracts to the minimum length along the height direction of the shell (7); when the telescopic tube (10) contracts to the minimum length, the lower end position of the telescopic tube (10) is higher than the outlet position of the heat collecting pipe (16), and the center of gravity heights of the solar thermal absorber (6), the center of gravity heights of the heat collecting pipe (16), and the center of gravity heights of the circulating pump (20) decrease in sequence; The telescopic tube (10) is an S-shaped pipe, comprising a plurality of horizontal sections (11) and a plurality of arc sections (12), wherein the horizontal sections (11) and the arc sections (12) are alternately connected in sequence, the horizontal sections (11) are parallel to the width direction of the shell (7), and the arc sections (12) can be telescoped along the height direction of the shell (7).

2. The telescopic anti-freezing and heat-collecting self-protection device according to claim 1 is characterized in that: The solar heat absorbing plate (14) is a rectangular structure, and each of the horizontal sections (11) is connected to one solar heat absorbing plate (14), and the solar heat absorbing plate (14) can move along with the horizontal section (11).

3. The telescopic anti-freezing and heat-collecting self-protection device according to claim 2, characterized in that: Two adjacent solar heat absorbing panels (14) are arranged in parallel and spaced apart, and the solar heat absorbing panels (14) are arranged obliquely relative to the height direction of the shell (7).

4. A telescopic anti-freeze expansion heat-collecting self-protection roadbed, characterized in that: The telescopic anti-freezing and heat-collecting self-protecting roadbed comprises a roadbed (2) and a telescopic anti-freezing and heat-collecting self-protecting device according to any one of claims 1 to 3, wherein the solar heat absorber (6) is installed on the outside of the roadbed (2), and the heat-collecting pipe (16) is inserted into the inside of the roadbed (2).

5. The telescopic anti-freeze expansion heat-collecting self-protection roadbed according to claim 4 is characterized in that: The telescopic anti-freeze heave heat-collecting self-protection roadbed further comprises a thermal insulation material layer (3), and the thermal insulation material layer (3) is arranged on the slope surface of the roadbed (2).

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