A highland permafrost region switch station anti-freezing foundation structure

Abstract

The utility model discloses a kind of highland permafrost area switch station anti-freezing foundation structure, belong to building construction technical field, including steel column, foundation main body, jacking slider and adjusting slider: the lower end of multiple steel columns is fixed in permafrost layer, the upper end of steel column is provided with foundation main body, and horizontal connecting plate is provided between adjacent steel columns;Multiple jacking sliders are arranged between active layer and foundation main body, jacking slider is respectively slidably connected with connecting plate and can slide along vertical direction, first inclined surface is provided on jacking slider;Multiple adjusting sliders are slidably connected on the lower side of foundation main body and can slide along horizontal direction, second inclined surface corresponding with first inclined surface is provided on adjusting slider, jacking slider is pushed to slide upwards when active layer frost heaving, and then adjusting slider is pushed to slide along horizontal direction;The anti-freezing foundation structure disclosed in the utility model solves the problem that heating insulation type anti-frost heaving mode has poor anti-frost heaving effect under extreme conditions.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a frost-resistant foundation structure for a switch station in a plateau permafrost region. Background Technology

[0002] In my country's high-latitude and seasonally permafrost regions, the construction of power facilities faces severe natural environmental challenges. Switching stations, as critical nodes in the power system, have foundation stability that directly affects the safe operation of the entire power grid. These regions are characterized by long winters and extremely low temperatures. When moisture in the foundation soil freezes at low temperatures, it expands in volume, creating the phenomenon known as frost heave. When temperatures rise and the ice melts, the soil softens again, leading to thaw settlement. This cyclical freeze-thaw process causes uneven heave and settlement of the foundation, resulting in cracking, tilting, or even damage to the foundations of the switching station's superstructure and equipment, seriously threatening the reliability and safety of power supply. Therefore, to ensure the structural integrity and long-term stability of switching stations in high-altitude frost-resistant areas, effective frost heave prevention treatment of their foundations is crucial.

[0003] Currently, passive insulation and frost protection technologies are commonly used in engineering projects to prevent frost heave in switchyard foundations in permafrost regions of plateau areas. A typical approach involves laying a certain thickness of insulation material, such as extruded polystyrene (XPS) or molded polystyrene (EPS), around the foundation or in the replacement area. The low thermal conductivity of these materials slows the loss of heat from the deep foundation to the cold external environment, thereby maintaining the soil temperature above freezing.

[0004] Existing passive insulation and frost protection technologies have significant limitations. Their frost protection effectiveness is highly dependent on the thermal resistance of the insulation material and the relative stability of the ambient temperature. When the switchyard area experiences extreme cold waves, persistent abnormally low temperatures, or when the designed insulation layer thickness is insufficient to cope with extreme climates, the enormous cold air from the external environment will continuously intrude and gradually penetrate the insulation layer. In this situation, the passive defense system relying solely on the thermal resistance of the material itself will be overwhelmed and unable to effectively prevent the temperature of the underlying soil layer from dropping below freezing point. This will lead to frost heave, and may even exacerbate localized frost heave damage due to moisture accumulation beneath the insulation layer. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a frost-resistant foundation structure for switch stations in plateau permafrost areas, which is simple in structure, reasonable in design, and highly practical, in order to address the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a frost-resistant foundation structure for switchyards in plateau permafrost areas, comprising: Multiple steel columns, with their lower ends fixed in the permafrost layer, and a horizontal foundation main body set at the upper end of the steel columns, with horizontal connecting plates set between adjacent steel columns; Multiple lifting sliders are set between the active layer and the main foundation. The lifting sliders are slidably connected to the connecting plate and can slide along the vertical direction. The lifting sliders are provided with a first inclined surface. Multiple adjusting sliders are slidably connected to the lower side of the foundation body and can slide along the horizontal direction. The adjusting sliders are provided with a second inclined surface corresponding to the first inclined surface. When the active layer freezes and heaves, it pushes the lifting slider to slide upward, thereby pushing the adjusting slider to slide along the horizontal direction. A return spring is also provided between the adjusting slider and the connecting plate.

[0007] Preferably, the lower surface of the foundation body is provided with a slide rail, and the upper surface of the adjusting slider is provided with a groove that cooperates with the slide rail.

[0008] Preferably, the chute is provided with multiple rollers, and the opening of the chute is provided with a dustproof sealing strip.

[0009] Preferably, a heating unit is provided between the adjusting slider and the movable layer. The heating unit includes a heat-conducting metal plate arranged parallel to the bottom surface of the adjusting slider. A silicone heater is provided on the side of the heat-conducting metal plate away from the movable layer. The power cord of the silicone heater is connected to the power supply of the switch station. A temperature sensor is also provided on the heat-conducting metal plate. Both the temperature sensor and the silicone heater are connected to the controller.

[0010] Preferably, a thermally conductive rubber layer is also provided on the side of the silicone heater that is away from the thermally conductive metal plate.

[0011] Preferably, the adjusting slider is hollow inside, and a heat absorption and release unit is provided inside the adjusting slider. A heat conduction unit is also provided between the heat absorption and release unit and the active layer. The heat released by the silicone heater is conducted by the heat conduction unit and then absorbed by the heat absorption and release unit. At the same time, the heat conduction unit can conduct the heat generated by the heat absorption and release unit to the heat conduction metal plate.

[0012] Preferably, the heat absorption and release unit includes a flexible silicone shell disposed in the cavity inside the adjusting slider, and the flexible silicone shell is filled with a phase change material.

[0013] Preferably, the heat-conducting unit includes a heat-conducting metal tube array vertically embedded in the bottom of the adjusting slider, the upper end of the heat-conducting metal tube array is in contact with the flexible silicone shell, and the lower end of the heat-conducting metal tube array is connected to the heat-conducting metal plate.

[0014] Preferably, the adjusting slider is provided with a heat insulation layer on its other sides, excluding the second inclined surface, top surface, and bottom surface.

[0015] This utility model has the following advantages compared with the prior art: 1. This utility model discloses a frost-resistant foundation structure for a switchyard in a high-altitude permafrost region. When encountering extreme cold weather or failure to heat the soil in time due to temperature detection errors, resulting in frost heave in the active layer soil, the mechanical stress relief unit composed of the lifting slider and the adjusting slider comes into play. When the lifting slider slides vertically, it pressurizes the adjusting slider and causes the adjusting slider to move horizontally, releasing stress through horizontal displacement and protecting the main foundation structure. Therefore, the foundation structure disclosed in this utility model, through the inclined plane-slider mechanism, effectively avoids direct damage to the upper foundation structure and switchyard equipment by frost heave force, fundamentally ensuring the safety and stability of the structure. 2. This utility model discloses a frost-resistant foundation structure for a switch station in a high-altitude permafrost region. It forms a dual mechanism to cope with frost heave, with active prevention as the primary method and mechanical pressure relief as a secondary method. Under normal circumstances, the temperature of the active layer soil is maintained above the freezing point through temperature monitoring and an active heating system, fundamentally preventing frost heave. In abnormal situations such as extreme cold, insufficient heating system power, or malfunction, if frost heave still occurs in the active layer, the vertical frost heave force is converted into a horizontal force and released through a slope-slider mechanism composed of a lifting slider and an adjusting slider, thereby protecting the safety of the superstructure. The two mechanisms work together to ensure the long-term reliability of the foundation structure in the high-altitude permafrost region.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a perspective view of an anti-freezing foundation structure for a switchyard in a high-altitude permafrost region, according to the present invention. Figure 2 This is a side view schematic diagram of an anti-freezing foundation structure for a switchyard in a high-altitude permafrost region according to the present invention; Figure 3 for Figure 2 Sectional view of AA.

[0018] Explanation of reference numerals in the attached figures: 1. Steel column; 2. Foundation main body; 3. Connecting plate; 4. Lifting slider; 4-1. First inclined surface; 5. Adjusting slider; 5-1. Adjusting slider; 6. Roller; 7. Slide rail; 8. Slide groove; 9. Flexible silicone shell; 10. Heat-conducting metal tube array; 11. Heating unit; 11-1. Heat-conducting metal plate; 11-2. Silicone heater; 11-3. Heat-conducting rubber layer; 12. Insulation layer; 13. Return spring; 14. Movable layer; 15. Permafrost layer. Detailed Implementation

[0019] like Figure 1 , Figure 2 , Figure 3As shown, this utility model discloses an anti-freezing foundation structure for a switchyard in a high-altitude permafrost region, comprising steel columns 1, a foundation body 2, lifting sliders 4, and adjusting sliders 5. The lower ends of multiple steel columns 1 are fixed in the permafrost layer 15, and the upper ends of the steel columns 1 are provided with a horizontal foundation body 2. The upper ends of the steel columns 1 are fixed to the horizontal foundation body 2 by pre-embedded anchor bolts or welding. The foundation body 2 is a cast-in-place reinforced concrete slab or a prefabricated steel structure platform, providing an installation foundation for the upper switchyard equipment. To facilitate the installation of the lifting sliders, horizontal connecting plates 3 are provided between adjacent steel columns 1. Multiple lifting sliders 4 are positioned between the movable layer 14 and the foundation body 2. The connecting plates 3 are provided with vertical grooves, and the lifting sliders 4 are provided with protrusions corresponding to the vertical grooves. The cross-section of the vertical groove is an inverted T-shape. The lifting sliders 4 are provided with T-shaped protrusions corresponding to the vertical grooves, and the lifting sliders 4 connect to the connecting plates 3 via these T-shaped protrusions. The T-shaped vertical groove on the connecting plate 3 forms a sliding connection, allowing the lifting slider 4 to slide vertically without detaching from the connecting plate 3. The lifting slider 4 is provided with a first inclined surface 4-1. Multiple adjusting sliders 5 are slidably connected to the lower side of the foundation body 2 and can slide horizontally. The adjusting slider 5 is provided with a second inclined surface 5-1 corresponding to the first inclined surface 4-1. When the active layer freezes and heaves, it pushes the lifting slider 4 to slide upward, thereby pushing the adjusting slider 5 to slide horizontally. A return spring 13 is also provided between the adjusting slider 5 and the connecting plate 3. The adjusting slider 5 is provided with a spring mounting lug, and a spring fixing seat is provided on the corresponding connecting plate 3. The two ends of the return spring 13 are respectively sleeved on the spring mounting lug and the spring fixing seat. When the adjusting slider 5 slides horizontally inward, the return spring 13 is stretched. After the frost heave force dissipates, the restoring force of the return spring 13 drives the adjusting slider 5 back to the initial position.

[0020] When the active soil layer undergoes frost heave due to low temperatures, its volume increases. The resulting upward frost heave force pushes the lifting slider 4 vertically upward along the connecting plate 3. The first inclined surface 4-1 of the lifting slider 4 then interacts with the second inclined surface 5-1 of the adjusting slider 5, converting the destructive upward vertical force into a horizontal thrust, which in turn drives the adjusting slider 5 to slide horizontally on the foundation body 2. This decomposes and releases the frost heave force, ensuring the vertical stability of the upper foundation body 2. After the frost heave force dissipates, the stretched return spring 13 automatically pulls the adjusting slider 5 back to its initial position. Simultaneously, under the push of the adjusting slider 5 and the weight of the lifting slider 4, the lifting slider 4 also returns to its original position along the vertical groove, preparing for the next freeze-thaw cycle. Therefore, the foundation structure disclosed in this utility model, through the inclined surface-slider mechanism, effectively avoids direct damage from frost heave force to the upper foundation body and switch station equipment, fundamentally ensuring the safety and stability of the structure.

[0021] Furthermore, to ensure that the adjusting slider 5 can slide smoothly in the horizontal direction when the lifting slider 4 presses against it, the lower surface of the foundation body 2 disclosed in this embodiment is provided with a slide rail 7, and the upper surface of the adjusting slider 5 is provided with a groove 8 that cooperates with the slide rail 7. The cooperation between the slide rail 7 and the groove 8 provides precise guiding constraints for the adjusting slider 5, ensuring that it can slide smoothly in the horizontal direction under the pressure of the lifting slider 4; at the same time, multiple rollers 6 are provided in the groove 8, which transform sliding friction into efficient rolling friction, greatly reducing the motion resistance of the adjusting slider 5 when sliding. A dustproof sealing strip is provided at the opening of the groove 8, which forms a key barrier to effectively prevent the intrusion of underground sand, water and other pollutants, thereby ensuring the long-term and reliable operation of the entire precision guiding mechanism in harsh environments.

[0022] like Figure 3 As shown, in this embodiment, a heating unit 11 is provided between the adjusting slider 5 and the movable layer. The heating unit 11 is a stacked module, which includes, from bottom to top, a thermally conductive rubber layer 11-3, a silicone heater 11-2, and a thermally conductive metal plate 11-1. The layers are bonded and fixed together with thermally conductive adhesive. The heating unit 11 module is fixed to the bottom surface of the adjusting slider 5 by countersunk bolts. The thermally conductive metal plate 11-1 is arranged parallel to the bottom surface of the adjusting slider 5. The power cord of the silicone heater 11-2 is connected to the power supply of the switch station. A temperature sensor is also provided on the thermally conductive metal plate 11-1. The temperature sensor and the silicone heater 11-2 are both connected to the controller. The controller is configured to control the silicone heater 11-2 to start heating when the temperature detected by the temperature sensor is lower than a first set threshold; and to control the silicone heater 11-2 to stop heating when the detected temperature is higher than a second set threshold. In this embodiment, a heating unit 11 is installed between the adjusting slider 5 and the lower active layer. During operation, a temperature sensor monitors the ambient temperature around the heat-conducting metal plate in real time. This temperature approximates the temperature of the active layer soil. The controller has a preset first anti-freezing threshold, for example, -0.5℃. When the monitored temperature drops to this threshold, the controller immediately turns on the power to the silicone heater 11-2, causing it to start heating. The heat is first transferred to the active layer below, and also to the heat-conducting metal plate 11-1. Therefore, the active heating method actively raises the temperature of the active layer soil, inhibiting its freezing. Conversely, when the temperature rises back to the set second threshold (e.g., +0.5℃), the controller automatically cuts off the power and stops heating, thereby achieving on-demand heating and energy-saving operation. At the same time, the heat from the heating unit 11 can also be transferred to the upper side of the adjusting slider, preventing the connection between the adjusting slider and the foundation body from freezing. Therefore, it can ensure that the adjusting slider can slide smoothly when compressed.

[0023] Furthermore, a thermally conductive rubber layer 11-3 is also provided on the side of the silicone heater 11-2 away from the thermally conductive metal plate 11-1, and the thermally conductive rubber layer 11-3 is in contact with the movable layer. By setting a rubber layer between the silicone heater and the movable layer, it is ensured that the heat generated by the silicone heater 11-2 can be uniformly transferred downwards, avoiding the accumulation of heat in the heater. In extreme conditions, when the movable layer freezes and expands, the huge upward stress generated will first act on the entire heating unit. The thermally conductive rubber layer, with its inherent elasticity, can effectively absorb and dissipate this concentrated impact force. Therefore, the rubber layer, as a buffer layer, can protect the upper adjusting slider and the upper foundation body from the mechanical impact caused by freezing and expansion, thereby ensuring that even under extreme freezing and expansion conditions, the mechanical stress relief system formed by the lifting slider 4 and the adjusting slider 5 can operate smoothly and reliably.

[0024] To ensure normal power supply to the silicone heater 11-2, a power cord mounting groove is provided on the steel column 1. The power cord of the silicone heater 11-2 is specifically installed in the mounting groove. Specifically, the power cord of the silicone heater 11-2 is led out from the silicone heater 11-2, passes through the gap between the two lifting sliders, and is fixed to the mounting groove on the steel column. At the same time, clamps and sealant are used to fix and waterproof the wire portion fixed in the mounting groove. Finally, the power cord is connected to the waterproof junction box and connected to the main power supply, thereby realizing normal power supply to the silicone heater 11-2.

[0025] To improve the foundation's adaptability to abnormal changes, the adjusting slider 5 disclosed in this embodiment is hollow inside. A heat absorption and release unit is provided inside the adjusting slider 5. A heat conduction unit is also provided between the heat absorption and release unit and the active layer. The heat released by the silicone heater 11-2 is conducted by the heat conduction unit and then absorbed by the heat absorption and release unit. At the same time, the heat conduction unit can conduct the heat generated by the heat absorption and release unit to the heat conduction metal plate 11-1. When the silicone heater 11-2 is heating, the heat conduction unit transfers excess heat to the heat absorption and release unit inside the adjusting slider. The heat absorption and release unit stores the heat energy through a phase change process. During cold periods when the heater is off or the power is insufficient, the heat absorption and release unit releases its stored latent heat, and the heat conduction unit then transfers this heat back to the heat conduction metal plate and the active soil layer below the heat conduction metal plate, continuing to provide heat to the active layer. By setting up the heat conduction unit and the heat absorption and release unit, not only is the excess heat energy generated by the heater recovered and utilized, avoiding energy waste and reducing the system's operating power consumption, but the heat absorption and release unit can also compensate for temperature fluctuations caused by the heater's start-up and shutdown or sudden changes in external temperature when releasing heat, ensuring that the temperature of the active soil layer is maintained within a stable range. This greatly improves the system's reliability and adaptability to extreme environments.

[0026] Specifically, the heat absorption and release unit disclosed in this embodiment includes a flexible silicone shell 9 disposed in the internal cavity of the adjusting slider 5. The shape of the flexible silicone shell 9 matches the internal cavity of the adjusting slider 5 and is fixed to the inner wall of the cavity by a high-temperature resistant silicone adhesive. The flexible silicone shell 9 is filled with a phase change material. Considering the environmental temperature, safety, durability, and cost in the permafrost region of the plateau, the phase change material filled inside the flexible silicone shell 9 is a composite phase change material with a phase change temperature in the range of 0°C to 2°C. Preferably, it is a shaped phase change material based on paraffin and adsorbed in a porous substrate (such as expanded graphite). When the silicone heater starts heating, the temperature inside the regulating slider 5 rises to +1°C, and the phase change material begins to melt, absorbing a large amount of heat while its own temperature remains basically unchanged, thus storing heat. When the system stops heating, and the external cold causes the temperature of the regulating slider to drop to 0°C, the phase change material begins to solidify, releasing the previously stored heat and transferring it to the lower active soil layer. In summary, this embodiment integrates a phase change material and a heat conduction unit inside the regulating slider. When the electric heater is working, it can absorb and store excess heat energy to prevent the system from overheating. When the heater is intermittent or turned off, it can actively release the stored heat to continuously provide insulation for the active layer, effectively compensating for temperature fluctuations caused by the start-up and shutdown of the heater or sudden changes in the external temperature.

[0027] When using mixed paraffin as a phase change material, to prevent the risk of phase separation and liquid leakage that may occur during long-term cycling, the mixed paraffin is pre-adsorbed into a porous matrix with a large number of micron-sized pores, such as expanded perlite, expanded graphite, or diatomaceous earth. The porous matrix firmly locks the liquid paraffin in the pores of its three-dimensional network structure through strong capillary forces, maintaining a macroscopic solid or paste-like form even during solid-liquid phase change. This structure fundamentally eliminates the migration and stratification of phase components, and effectively prevents material leakage caused by accidental damage to the flexible silicone shell, greatly improving the safety and service life of the system.

[0028] Furthermore, the heat-conducting unit specifically includes a heat-conducting metal tube array 10 vertically embedded in the bottom of the adjusting slider 5. The heat-conducting metal tube array 10 is made of copper or aluminum tubes. The upper end of the heat-conducting metal tube array 10 contacts the flexible silicone shell 9, and the lower end is connected to the heat-conducting metal plate 11-1. When the silicone heater 11-2 is working, it generates heat, which is mainly transferred through two paths: the main path is downward through the heat-conducting metal plate 11-1 and the heat-conducting rubber layer 11-3 directly to the active soil layer; the energy storage path is upward through the heat-conducting metal tube array 10, which is in close contact with the heat-conducting metal plate 11-1, and conducted to the flexible silicone shell 9 inside the adjusting slider 5, where it is absorbed and stored by the phase change material.

[0029] The adjusting slider 5 is provided with a heat insulation layer 12 on its other sides, except for the second inclined surface 5-1, the top surface, and the bottom surface. This heat insulation layer 12 can effectively limit the heat generated by the heater and the heat stored by the phase change material to the preset vertical conduction path of the adjusting slider-heat conducting unit-moving layer, which greatly reduces the ineffective heat loss to the cold side environment.

[0030] In summary, this utility model discloses an anti-freezing foundation structure for a switchyard in a high-altitude permafrost region. When the temperature sensor detects that the temperature of the active layer soil around the metal plate has dropped to a preset first threshold, the controller immediately activates the heating unit for active heating until the temperature rises back to a second preset threshold, thus fundamentally preventing frost heave. During this heating cycle, the phase change material absorbs and stores excess heat energy when heated, and releases latent heat when heating stops or in cold weather to maintain a stable active layer temperature. Furthermore, in cases of extreme cold weather or failure to heat in time due to temperature detection errors, if frost heave exists in the active layer soil, the mechanical stress release unit composed of the lifting slider and the adjusting slider comes into play. When the lifting slider slides vertically, it pressurizes the adjusting slider, causing the adjusting slider to move horizontally, releasing stress through horizontal displacement and protecting the main foundation structure. In conclusion, the anti-freezing foundation structure disclosed in this utility model solves the problem of poor frost heave prevention effect of heating and insulation-based anti-freezing methods under extreme conditions, achieving reliable control of foundation frost heave.

[0031] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A frost-resistant foundation structure for a switchyard in a high-altitude permafrost region, characterized in that, include: Multiple steel columns (1) are fixed at their lower ends in the permafrost layer (15). A horizontal foundation body (2) is provided at the upper end of the steel column (1), and a horizontal connecting plate (3) is provided between adjacent steel columns (1). Multiple lifting sliders (4) are set between the active layer (14) and the foundation body (2). The lifting sliders (4) are slidably connected to the connecting plate (3) and can slide along the vertical direction. The lifting sliders (4) are provided with a first inclined surface (4-1). Multiple adjusting sliders (5) are slidably connected to the lower side of the foundation body (2) and can slide along the horizontal direction. The adjusting sliders (5) are provided with a second inclined surface (5-1) corresponding to the first inclined surface (4-1). When the active layer (14) freezes and expands, it pushes the lifting slider (4) to slide upward, thereby pushing the adjusting sliders (5) to slide along the horizontal direction. A reset spring (13) is also provided between the adjusting sliders (5) and the connecting plate (3).

2. The anti-freezing foundation structure for a switchyard in a high-altitude permafrost region according to claim 1, characterized in that, The lower surface of the foundation body (2) is provided with a slide rail (7), and the upper surface of the adjusting slider (5) is provided with a groove (8) that cooperates with the slide rail (7).

3. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 2, characterized in that, The chute (8) is provided with multiple rollers (6), and the opening of the chute (8) is provided with a dustproof sealing strip.

4. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 1, characterized in that, A heating unit (11) is provided between the adjusting slider (5) and the active layer (14). The heating unit (11) includes a heat-conducting metal plate (11-1) arranged parallel to the bottom surface of the adjusting slider (5). A silicone heater (11-2) is provided on the side of the heat-conducting metal plate (11-1) away from the active layer (14). The power cord of the silicone heater (11-2) is connected to the power supply of the switch station. A temperature sensor is also provided on the heat-conducting metal plate (11-1). The temperature sensor and the silicone heater (11-2) are both connected to the controller.

5. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 4, characterized in that, The silicone heater (11-2) is further provided with a thermally conductive rubber layer (11-3) on the side away from the thermally conductive metal plate (11-1).

6. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 4, characterized in that, The adjusting slider (5) is hollow inside. A heat absorption and heat release unit is provided inside the adjusting slider (5). A heat conduction unit is also provided between the heat absorption and heat release unit and the active layer (14). The heat released by the silicone heater (11-2) is conducted by the heat conduction unit and then absorbed by the heat absorption and heat release unit. The heat conduction unit can conduct the heat generated by the heat absorption and heat release unit to the heat conduction metal plate (11-1).

7. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 6, characterized in that, The heat absorption and release unit includes a flexible silicone shell (9) disposed in the cavity inside the adjusting slider (5), and the flexible silicone shell (9) is filled with phase change material.

8. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 7, characterized in that, The heat-conducting unit includes a heat-conducting metal tube array (10) vertically embedded in the bottom of the adjusting slider (5). The upper end of the heat-conducting metal tube array (10) is in contact with the flexible silicone shell (9), and the lower end of the heat-conducting metal tube array (10) is connected to the heat-conducting metal plate (11-1).

9. The anti-freezing foundation structure for a switchyard in a plateau permafrost region according to claim 4, characterized in that, The adjusting slider (5) has a heat insulation layer (12) on its other sides, except for the second inclined surface (5-1), the top surface, and the bottom surface.

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