Electric heating interactive shield tunnel anti-settlement energy pile system and construction method thereof

Abstract

The invention relates to the field of subway tunnels, in particular to an electric heating interactive shield tunnel anti-settlement energy pile system and a construction method thereof. The heat supply device is arranged in a subway tunnel and comprises a heat supply part embedded outside a shield segment of the subway tunnel, a first connecting pipeline located in the shield segment is arranged on the heat supply part, a heat pump part communicated with the heat supply part is connected to the first connecting pipeline, an air conditioner part is arranged in the subway tunnel, and a circulation loop pipeline is arranged on the air conditioner part. The heat pump part is connected with a cold water connecting pipeline and a hot water connecting pipeline, the cold water connecting pipeline and the hot water connecting pipeline are both communicated with the circulation loop pipeline, and the heat pump part and the air conditioner part are jointly connected with a control part; the anti-settling capacity of the subway tunnel and the shield tunnel is effectively improved, an energy supply system in which electric energy and geothermal energy are coordinated and complemented is established, and then rich geothermal resources are effectively utilized.

Description

Technical Field

[0001] This invention relates to the field of subway tunnels, and more particularly to an electrothermal interactive shield tunnel anti-settlement energy pile system and its construction method. Background Technology

[0002] With the widespread application of shield tunneling technology in urban underground transportation construction, especially in special environments with complex geological conditions, abundant groundwater, or weak soil layers, problems such as tunnel settlement, soil deformation, and ground settlement are becoming increasingly prominent. These problems not only directly affect the stability and safety of the tunnel structure but may also have serious impacts on surrounding buildings, roads, and public facilities. In areas with complex geological conditions, the plasticity and fluidity of the soil are relatively high, which may lead to excessively rapid or uneven soil settlement, thereby causing unstable changes in the ground around the tunnel and increasing safety hazards during tunnel construction. Especially in densely populated urban areas, the development of underground space must fully consider the impact of tunnel construction on the surrounding environment. Therefore, how to effectively control the settlement of shield tunnels and improve their anti-settlement capacity has become a key issue that urgently needs to be addressed in modern shield tunnel design and construction.

[0003] Furthermore, subway tunnels are typically located in areas rich in geothermal resources. Geothermal energy, as a clean and renewable energy source, has enormous potential. With increasing attention to environmental protection and energy sustainability, the development and utilization of geothermal energy is gradually becoming an important energy option. Previously, the application of geothermal energy in the form of energy piles has achieved good results in some projects. However, how to effectively combine geothermal energy development with settlement control technology for shield tunnels, how to effectively reduce the maintenance costs of energy piles, and how to extend their service life still face many technical challenges. Summary of the Invention

[0004] The present invention aims to solve the above problems, thereby providing an electrothermal interactive shield tunnel anti-settlement energy pile system and its construction method, which effectively improves the anti-settlement capacity of subway tunnels and shield tunnels, and establishes an energy supply system that coordinates and complements electrical energy and geothermal energy, thereby effectively utilizing abundant geothermal resources.

[0005] The technical solution adopted by the present invention to solve the aforementioned problem is as follows: An electrothermal interactive shield tunnel anti-settlement energy pile system is installed in a subway tunnel. It includes a heating unit embedded outside the shield tunnel segments, a first connecting pipe located inside the shield tunnel segments on the heating unit, and a heat pump unit connected to the heating unit via the first connecting pipe. An air conditioning unit is installed inside the subway tunnel, with a circulation loop pipe on the air conditioning unit. Cold water and hot water connecting pipes are connected to the heat pump unit, both connected to the circulation loop pipe. A control unit is connected to both the heat pump unit and the air conditioning unit. The heating unit includes several identical anti-settlement energy piles arranged in two rows along the longitudinal direction of the subway tunnel. The two rows of anti-settlement energy piles are symmetrically arranged with the left-right symmetrical dividing line of the subway tunnel as the center line. Two piles within the same row... The spacing between adjacent anti-settlement energy piles is the same. Several anti-settlement energy piles in two rows are connected in series through the first connecting pipe. Several inclined pile holes are set on the shield tunnel segment, and each inclined pile hole corresponds to a certain number of anti-settlement energy piles. The inclined pile holes extend to the outside of the shield tunnel segment. The anti-settlement energy pile includes a cylindrical hollow steel pipe with an open top and a closed bottom, which is inserted into the inclined pile hole. Limiting bosses cast on the inner surface of the shield tunnel segment are set around the inclined pile hole. A positioning block abutting against the limiting boss is set on the outer wall of the upper end of the steel pipe. A reinforcing cage is placed inside the steel pipe, and a U-shaped heat exchange pipe is fixedly connected to the reinforcing cage. Concrete covering the reinforcing cage and the U-shaped heat exchange pipe is poured inside the steel pipe. The first connecting pipe connects two adjacent U-shaped heat exchange pipes in series.

[0006] Furthermore, the U-shaped heat exchange tube has a double-layer structure, including an outer tube body and an inner tube body. The outer diameter of the inner tube body is tangent to the inner diameter of the outer tube body. The outer tube body is placed in concrete and fixedly connected to the reinforcing cage. The inner tube body includes a U-shaped connecting section fixed inside the outer tube body. A water inlet section is threaded to one end of the U-shaped connecting section, and a water outlet section is threaded to the other end of the U-shaped connecting section. Both the water inlet section and the water outlet section are slidably connected to the outer tube body, and both the water inlet section and the water outlet section are connected to the first connecting pipe.

[0007] Furthermore, the control unit includes a control platform, on which several temperature sensors are connected. These temperature sensors are correspondingly embedded in the soil around the anti-settlement energy piles outside the shield tunnel segments and inside the subway tunnel.

[0008] Furthermore, the heat pump unit includes a hot water storage tank and a cold water storage tank, with an inlet on the first connecting pipe connected to the cold water storage tank, and an outlet on the first connecting pipe connected to the hot water storage tank.

[0009] Furthermore, a cold water connection pipe is installed on the cold water storage tank, which is connected to the circulation loop pipe, and a hot water connection pipe is installed on the hot water storage tank, which is connected to the circulation loop pipe.

[0010] Furthermore, an electric heating wire is installed in the hot water storage tank, and the electric heating wire is connected to the control platform.

[0011] Furthermore, the air conditioning unit is connected to the control platform.

[0012] Furthermore, a concrete anti-seepage layer is poured inside the subway tunnel, which covers the upper end of the anti-settlement energy pile, and the inlet and outlet of the first connecting pipe extend upwards out of the concrete anti-seepage layer.

[0013] A construction method for an electrothermal interactive shield tunnel anti-settlement energy pile system includes the following steps: S1. Inclined pile holes are constructed at the pre-reserved holes on the shield segments of the subway tunnel. The diameter of the inclined pile hole is compatible with the round steel pipe, and the inclination of the inclined pile hole is determined according to the design requirements. S2. Pre-embed a temperature sensor in the inclined insertion hole and connect the temperature sensor to the control platform of the control unit. Then insert the round steel pipe into the inclined pile hole, and place the positioning block against the limiting boss so that the lower end of the round steel pipe extends to the outside of the shield segment, thereby making the lower end of the round steel pipe contact the soil outside the shield segment. S3. Fabricate a steel cage and fix the U-shaped heat exchange tube inside the steel cage. Then, test the sealing performance of the U-shaped heat exchange tube by passing water through it. Replace any U-shaped heat exchange tubes that fail the sealing test in time. S4. Then, concrete is poured into the round steel pipe to cover the steel cage and U-shaped heat exchange pipe. The construction of a single anti-settlement energy pile is completed when the concrete is cured. S5. Repeat steps S1-S4 above to complete the construction of the remaining anti-settlement energy piles, and connect the two adjacent U-shaped heat exchange pipes in series through the first connecting pipe. S6. Connect the inlet of the first connecting pipe to the cold water storage tank of the heat pump unit, and connect the outlet of the first connecting pipe to the hot water storage tank of the heat pump unit; then, connect the cold water storage tank and the circulation loop pipe through the cold water connecting pipe, and connect the hot water storage tank and the circulation loop pipe through the hot water connecting pipe. S7. Connect the electric heating wire in the hot water storage tank to the control platform of the control unit, connect the air conditioning unit to the control platform, bury the temperature sensor at the preset position in the subway tunnel, and connect the temperature sensor to the control platform. S8. Then conduct water flow and heating tests. If the test fails, replace the damaged parts in time. Once the test passes, the construction can be completed.

[0014] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: This invention effectively improves the anti-settlement capacity of subway tunnels and shield tunnels, and establishes an energy supply system that coordinates and complements electrical and geothermal energy, thereby effectively utilizing abundant geothermal resources. Taking into full account the construction characteristics of subway tunnels and shield tunnels, it sets inclined pile holes on the shield segments, installs anti-settlement energy piles in the inclined pile holes, and embeds U-shaped heat exchange pipes in the anti-settlement energy piles. This not only effectively extends the service life of the U-shaped heat exchange pipes but also fully leverages the structural advantages of the anti-settlement energy piles, enhancing the stability of subway tunnels and shield tunnels. This invention extracts geothermal energy by embedding U-shaped heat exchange pipes in anti-settlement energy piles, heats the heat transfer medium, and connects the U-shaped heat exchange pipes to the circulation loop pipelines of the heat pump section and the air conditioning section to form a complete heat energy circulation system. The heat pump section can also use electric heating wires to assist in heating the heat transfer medium, thereby establishing a coordinated and complementary energy supply system of electrical energy and geothermal energy to ensure the continuous and stable operation of the temperature control function. The control unit of this invention can monitor the geothermal temperature and the internal temperature of the subway tunnel through a temperature sensor, and adjust the electric heating wire to assist in heating the heat transfer medium according to the heat demand of the air conditioning unit to achieve temperature regulation; at the same time, when the geothermal temperature is high, the control unit can turn off the electric heating wire and stop the auxiliary heating, thereby effectively saving energy. If the U-shaped heat exchange tube of the present invention is damaged and leaks water, the location of the damage can be determined by water flow test. If the damage and leakage are found to be located in the water inlet and water outlet sections of the inner tube, they can be replaced in time. If the damage and leakage are found to be located in the U-shaped connection section of the inner tube, the connection between the anti-settlement energy pile and the first connecting pipe is disconnected, and the anti-settlement energy pile is skipped and reconnected in series. This effectively reduces maintenance costs and reduces a series of impacts caused by the damage and leakage of the U-shaped heat exchange tube. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-settlement energy pile installation structure of the present invention; Figure 2 This is a top view schematic diagram of the steel cage and U-shaped heat exchange tube of the present invention; Figure 3 This is a schematic diagram of the main view structure of the anti-settlement energy pile of the present invention; Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the connection structure of the heating section, heat pump section and air conditioning section of the present invention; Figure 6 This is a schematic diagram of the connection structure of the heating section, heat pump section and control section of the present invention; In the diagram: 1. Shield tunnel segment; 2. Heating section; 3. First connecting pipe; 4. Heat pump section; 5. Air conditioning section; 6. Cold water connecting pipe; 7. Hot water connecting pipe; 8. Control section; 9. Anti-settlement energy pile; 10. Inclined pile hole; 11. Round steel pipe; 12. Limiting boss; 13. Positioning block; 14. Reinforcing cage; 15. U-shaped heat exchange pipe; 16. Concrete; 17. Hot water storage tank; 18. Cold water storage tank; 19. Inlet; 20. Outlet; 21. Electric heating wire; 22. Concrete anti-seepage layer; 23. Solid steel bar; 24. Stirrup; 25. Outer pipe body; 26. U-shaped connecting section; 27. Inlet section; 28. Outlet section; 29. ​​Control platform; 30. Temperature sensor. Detailed Implementation

[0016] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0017] See Figures 1 to 6 As shown, the technical solution of the present invention is as follows: An electrothermal interactive shield tunnel anti-settlement energy pile system is installed in a subway tunnel. It includes a heating unit 2 embedded outside the shield segment 1 of the subway tunnel, with a first connecting pipe 3 connected to the heating unit 2. The first connecting pipe 3 is located inside the shield segment 1, and a heat pump unit 4 is connected to the first connecting pipe 3. The heating unit 2 is connected to the heat pump unit 4 through the first connecting pipe 3. An air conditioning unit 5 is installed inside the subway tunnel, with a circulation loop pipe on the air conditioning unit 5. A cold water connection pipe 6 and a hot water connection pipe 7 are connected to the heat pump unit 4. The cold water connection pipe 6... Both the hot water connection pipe 7 and the circulating loop pipe are connected to the heat pump section 4 and the air conditioning section 5. The control section 8 is connected to both the heat pump section 4 and the air conditioning section 5. The heating section 2 and the heat pump section 4 are used to heat the heat transfer medium and transport it to the circulating loop pipe of the air conditioning section 5. The air conditioning section 5 uses the heat energy of the heat transfer medium to regulate the internal temperature of the subway tunnel. The control section 8 monitors the temperature inside the subway tunnel to regulate the working status of the air conditioning section 5 in real time. The control section 8 also monitors the temperature of the heat transfer medium to regulate the working status of the heat pump section 4, thus establishing a coordinated and complementary energy supply system of electrical energy and geothermal energy. The heating section 2 includes several anti-settlement energy piles 9 with the same structure. The several anti-settlement energy piles 9 are arranged in two rows along the longitudinal direction of the subway tunnel. The two rows of anti-settlement energy piles 9 are arranged symmetrically with the left and right symmetrical dividing line of the subway tunnel as the center line. The spacing between two adjacent anti-settlement energy piles 9 in the same row is the same. The several anti-settlement energy piles 9 in the two rows are connected in series through the first connecting pipe 3. Several inclined pile holes 10 are set on the shield segment 1. The several inclined pile holes 10 correspond one-to-one with the several anti-settlement energy piles 9, and the several inclined pile holes 10 extend to the outside of the shield segment 1. The anti-settlement energy pile 9 includes a cylindrical hollow steel pipe 11. The top surface of the steel pipe 11 is open and the bottom surface is closed. It is inserted into the inclined pile hole 10. A limiting boss 12 is provided around the inclined pile hole 10 and cast on the inner surface of the shield segment 1. A positioning block 13 is provided on the outer wall of the upper end of the steel pipe 11 and abuts against the limiting boss 12. A steel cage 14 is placed inside the steel pipe 11. The steel cage 14 is made of two solid steel bars 23 and several stirrups 24. A U-shaped heat exchange pipe 15 for extracting geothermal energy is fixedly connected to the steel cage 14. Concrete 16 is poured inside the steel pipe 11 to cover the steel cage 14 and the U-shaped heat exchange pipe 15. The first connecting pipe 3 connects two adjacent U-shaped heat exchange pipes 15 in series. The above structural design uses geothermal energy to heat the heat transfer medium, optimizes the energy structure, and reduces energy costs. The U-shaped heat exchange tube 15 has a double-layer structure, including an outer tube body 25 and an inner tube body. The outer diameter of the inner tube body is tangent to the inner diameter of the outer tube body 25. The outer tube body 25 is placed in concrete and fixedly connected to the reinforcing cage 14. The inner tube body includes a U-shaped connecting section 26 fixed inside the outer tube body 25. A water inlet section 27 is threaded to one end of the U-shaped connecting section 26, and a water outlet section 28 is threaded to the other end of the U-shaped connecting section 26. Both the water inlet section 27 and the water outlet section 28 are slidably connected to the outer tube body 25, and both the water inlet section 27 and the water outlet section 28 are connected to the first connecting pipe 3.

[0018] The control unit 8 includes a control platform 29, on which several temperature sensors 30 are connected. These temperature sensors 30 are correspondingly embedded in the soil around the anti-settlement energy piles 9 outside the shield tunnel segment 1 and inside the subway tunnel. The air conditioning unit 5 is connected to the control platform 29. The control platform 29 regulates the electric heating wire 21 to assist heating based on the temperature data fed back by the temperature sensors 30. When the local geothermal temperature is insufficient to meet the heat demand, the control unit 8 regulates the electric heating wire 21 to assist in heating the heat transfer medium in the hot water storage tank 17. When the local geothermal temperature is high, the control unit 8 regulates the electric heating wire 21 to shut it off in time to reduce energy consumption.

[0019] The heat pump unit 4 includes a hot water storage tank 17 and a cold water storage tank 18. An inlet 19 is provided on the first connecting pipe 3, connected to the cold water storage tank 18. An outlet 20 is provided on the first connecting pipe 3, connected to the hot water storage tank 17. A cold water connecting pipe 6 is provided on the cold water storage tank 18, connected to the circulation loop pipe. A hot water connecting pipe 7 is provided on the hot water storage tank 17, connected to the circulation loop pipe. An electric heating wire 21 is provided in the hot water storage tank 17, connected to the control platform 29. When the heat transfer medium from the heating unit 2 is delivered to the hot water storage tank 17, the electric heating wire 21 in the hot water storage tank 17 provides auxiliary heating to the heat transfer medium according to the control instructions of the control unit 8, ensuring that the heat carried by the heat transfer medium is sufficient to meet the temperature control requirements.

[0020] A concrete anti-seepage layer 22 is poured inside the subway tunnel. The concrete anti-seepage layer 22 covers the upper end of the anti-settlement energy pile 9, and the inlet 19 and outlet 20 of the first connecting pipe 3 extend upward out of the concrete anti-seepage layer 22.

[0021] Working principle: The heating unit 2 extracts geothermal energy by heating the heat transfer medium through heat exchange and delivers the heat-carrying heat transfer medium to the heat pump unit 4; the heat-carrying heat transfer medium is delivered to the hot water storage tank 17, and then enters the circulation loop of the air conditioning unit 5 through the hot water connection pipe 7, thereby regulating the internal temperature of the subway tunnel and subway station; during the overall circulation process, the temperature sensor 30 monitors the geothermal temperature and the internal temperature of the subway tunnel in real time. When the geothermal temperature is insufficient to meet the heat demand of the subway tunnel, the control unit 8 adjusts the electric heating wire 21 to assist in heating the heat transfer medium in the hot water storage tank 17; when the geothermal temperature is high, the control unit 8 adjusts the electric heating wire 21 to turn off in order to reduce energy consumption.

[0022] A construction method for an electrothermal interactive shield tunnel anti-settlement energy pile system includes the following steps: S1. Construct inclined pile holes 10 at the pre-reserved holes on the shield segment 1 of the subway tunnel. The diameter of the inclined pile hole 10 is compatible with the circular steel pipe 11, and the inclination of the inclined pile hole 10 is determined according to the design requirements. S2. A temperature sensor 30 is pre-embedded in the inclined insertion hole and connected to the control platform 29 of the control unit 8. Then, the round steel pipe 11 is inserted into the inclined pile hole 10, and the positioning block 13 is abutted against the limiting boss 12 so that the lower end of the round steel pipe 11 extends to the outside of the shield segment 1, thereby making the lower end of the round steel pipe 11 contact the soil outside the shield segment 1. S3. Fabricate a steel cage 14 and fix the U-shaped heat exchange tube 15 inside the steel cage 14. Then, test the sealing performance of the U-shaped heat exchange tube 15 by passing water through it. Replace the U-shaped heat exchange tube 15 that fails the sealing test in time. S4. Then, concrete is poured into the round steel pipe 11 to cover the steel cage 14 and the U-shaped heat exchange pipe 15. When the concrete is cured, the construction of a single anti-settlement energy pile 9 is completed. S5. Repeat steps S1-S4 above to complete the construction of the remaining anti-settlement energy piles 9, and connect the two adjacent U-shaped heat exchange pipes 15 in series through the first connecting pipe 3. S6. Connect the inlet 19 on the first connecting pipe 3 to the cold water storage tank 18 of the heat pump unit 4, and connect the outlet 20 on the first connecting pipe 3 to the hot water storage tank 17 of the heat pump unit 4; then, connect the cold water storage tank 18 and the circulation loop pipe through the cold water connecting pipe 6, and connect the hot water storage tank 17 and the circulation loop pipe through the hot water connecting pipe 7. S7. Connect the electric heating wire 21 in the hot water storage tank 17 to the control platform 29 of the control unit 8, connect the air conditioning unit 5 to the control platform 29, bury the temperature sensor 30 at a preset position in the subway tunnel, and connect the temperature sensor 30 to the control platform 29. S8. Then conduct water flow and heating tests. If the test fails, replace the damaged parts in time. Once the test passes, the construction can be completed.

[0023] This invention effectively improves the anti-settlement capacity of subway tunnels and shield tunnels, and establishes an energy supply system that coordinates and complements electrical and geothermal energy, thereby effectively utilizing abundant geothermal resources. Taking into full account the construction characteristics of subway tunnels and shield tunnels, inclined pile holes 10 are set on the shield segment 1, and anti-settlement energy piles 9 are set in the inclined pile holes 10. U-shaped heat exchange pipes 15 are buried in the anti-settlement energy piles 9, which not only effectively extends the service life of the U-shaped heat exchange pipes 15, but also gives full play to the structural advantages of the anti-settlement energy piles 9, enhancing the stability of subway tunnels and shield tunnels. This invention extracts geothermal energy by embedding U-shaped heat exchange pipes 15 in anti-settlement energy piles 9, heats the heat transfer medium, and connects the U-shaped heat exchange pipes 15 to the circulation loop of the heat pump section 4 and the air conditioning section 5 to form a complete thermal energy circulation system; wherein, the heat pump section 4 can also use electric heating wires 21 to assist in heating the heat transfer medium, thereby establishing an energy supply system that coordinates and complements electrical energy and geothermal energy, ensuring the continuous and stable operation of the temperature control function; The control unit 8 of this invention can monitor the geothermal temperature and the internal temperature of the subway tunnel through the temperature sensor 30, and adjust the electric heating wire 21 to assist in heating the heat transfer medium according to the heat demand of the air conditioning unit 5 to achieve temperature regulation; at the same time, when the geothermal temperature is high, the control unit 8 can turn off the electric heating wire 21 to stop the auxiliary heating, thereby effectively saving energy. If the U-shaped heat exchange tube 15 of the present invention is damaged and leaks water, the location of the damage can be determined by water flow test. If the damage and leakage are found to be located in the water inlet section 27 and water outlet section 28 of the inner tube body, it can be replaced in time. If the damage and leakage are found to be located in the U-shaped connection section 26 of the inner tube body, the connection between the anti-settlement energy pile 9 and the first connecting pipe is disconnected, and the anti-settlement energy pile 9 is skipped and reconnected in series. This effectively reduces maintenance costs and reduces a series of impacts caused by the damage and leakage of the U-shaped heat exchange tube 15.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. An electrothermal interactive shield tunnel anti-settlement energy pile system, installed in a subway tunnel, characterized in that: The system includes a heating unit embedded outside the shield tunnel segments of the subway tunnel. A first connecting pipe located inside the shield tunnel segments is installed on the heating unit. A heat pump unit connected to the heating unit is connected to the first connecting pipe. An air conditioning unit is installed inside the subway tunnel. A circulation loop pipe is installed on the air conditioning unit. Cold water and hot water connection pipes are connected to the heat pump unit, both of which are connected to the circulation loop pipes. A control unit is connected to both the heat pump unit and the air conditioning unit. The heating unit includes several identical anti-settlement energy piles, arranged in two rows along the longitudinal direction of the subway tunnel. The two rows of anti-settlement energy piles are symmetrically arranged with the left-right symmetrical dividing line of the subway tunnel as the center line. The spacing between two adjacent anti-settlement energy piles in the same row is the same. Several anti-settlement energy piles in two rows are connected in series through a first connecting pipe. Several inclined pile holes are set on the shield tunnel segment, and each inclined pile hole corresponds to a certain number of anti-settlement energy piles. The inclined pile holes extend to the outside of the shield tunnel segment. The anti-settlement energy pile includes a cylindrical hollow steel pipe with an open top and a closed bottom, which is inserted into the inclined pile hole. Limiting bosses cast on the inner surface of the shield tunnel segment are set around the inclined pile hole. A positioning block abutting against the limiting boss is set on the outer wall of the upper end of the steel pipe. A reinforcing cage is placed inside the steel pipe, and a U-shaped heat exchange pipe is fixedly connected to the reinforcing cage. Concrete covering the reinforcing cage and the U-shaped heat exchange pipe is poured inside the steel pipe. The first connecting pipe connects two adjacent U-shaped heat exchange pipes in series.

2. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 1, characterized in that: The U-shaped heat exchange tube has a double-layer structure, consisting of an outer tube and an inner tube. The outer diameter of the inner tube is tangent to the inner diameter of the outer tube. The outer tube is placed in concrete and fixedly connected to a reinforcing cage. The inner tube includes a U-shaped connecting section fixed inside the outer tube. A water inlet section is threaded to one end of the U-shaped connecting section, and a water outlet section is threaded to the other end of the U-shaped connecting section. Both the water inlet and outlet sections are slidably connected to the outer tube and are connected to the first connecting pipe.

3. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 1, characterized in that: The control unit includes a control platform, on which several temperature sensors are connected. These temperature sensors are correspondingly embedded in the soil around the anti-settlement energy piles outside the shield tunnel segments and inside the subway tunnel.

4. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 3, characterized in that: The heat pump unit includes a hot water storage tank and a cold water storage tank. An inlet is provided on the first connecting pipe, which is connected to the cold water storage tank. An outlet is provided on the first connecting pipe, which is connected to the hot water storage tank.

5. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 4, characterized in that: A cold water connection pipeline is installed on the cold water storage tank, which is connected to the circulation loop pipeline. A hot water connection pipeline is installed on the hot water storage tank, which is connected to the circulation loop pipeline.

6. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 5, characterized in that: An electric heating wire is installed in the hot water storage tank, and the electric heating wire is connected to the control platform.

7. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 3, characterized in that: The air conditioning unit is connected to the control platform.

8. The electrothermal interactive shield tunnel anti-settlement energy pile system according to claim 4, characterized in that: A concrete anti-seepage layer is poured inside the subway tunnel, which covers the upper end of the anti-settlement energy pile, and the inlet and outlet of the first connecting pipe extend upwards out of the concrete anti-seepage layer.

9. A construction method for an electrothermal interactive shield tunnel anti-settlement energy pile system according to any one of claims 1-8, characterized in that: Includes the following steps: S1. Inclined pile holes are constructed at the pre-reserved holes on the shield segments of the subway tunnel. The diameter of the inclined pile hole is compatible with the round steel pipe, and the inclination of the inclined pile hole is determined according to the design requirements. S2. Pre-embed a temperature sensor in the inclined insertion hole and connect the temperature sensor to the control platform of the control unit. Then insert the round steel pipe into the inclined pile hole, and place the positioning block against the limiting boss so that the lower end of the round steel pipe extends to the outside of the shield segment, thereby making the lower end of the round steel pipe contact the soil outside the shield segment. S3. Fabricate a steel cage and fix the U-shaped heat exchange tube inside the steel cage. Then, test the sealing performance of the U-shaped heat exchange tube by passing water through it. Replace any U-shaped heat exchange tubes that fail the sealing test in time. S4. Then, concrete is poured into the round steel pipe to cover the steel cage and U-shaped heat exchange pipe. The construction of a single anti-settlement energy pile is completed when the concrete is cured. S5. Repeat steps S1-S4 above to complete the construction of the remaining anti-settlement energy piles, and connect the two adjacent U-shaped heat exchange pipes in series through the first connecting pipe. S6. Connect the inlet of the first connecting pipe to the cold water storage tank of the heat pump unit, and connect the outlet of the first connecting pipe to the hot water storage tank of the heat pump unit; then, connect the cold water storage tank and the circulation loop pipe through the cold water connecting pipe, and connect the hot water storage tank and the circulation loop pipe through the hot water connecting pipe. S7. Connect the electric heating wire in the hot water storage tank to the control platform of the control unit, connect the air conditioning unit to the control platform, bury the temperature sensor at the preset position in the subway tunnel, and connect the temperature sensor to the control platform. S8. Then conduct water flow and heating tests. If the test fails, replace the damaged parts in time. Once the test passes, the construction can be completed.

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