A freezing prevention device for a drainage channel of an energy tunnel in a cold region and a construction method thereof

Abstract

The application discloses a kind of cold region energy tunnel drainage passage anti-freezing device, belong to energy underground engineering technical field, solve the problem that cold region energy tunnel is caused to freeze injury by the failure of drainage system caused by insufficient heating of drainage passage, it includes multiple heat exchange pipe groups, multiple heat exchange pipe groups are connected with heat pump unit by water inlet pipe and backwater pipe, heat exchange pipe group includes respectively buried in the left exchange pipe group and right exchange pipe group around two sides drainage passage, left exchange pipe group and right exchange pipe group are connected by two first heat exchange pipes buried in road surface layer, two first heat exchange pipes are connected by second heat exchange pipe buried in road surface layer.The application is buried in heat exchange pipe group around drainage passage and road surface layer, and the road surface layer is heated to prevent the freezing of cold region tunnel road or drainage failure, prevent the freezing of tunnel arch, ditch freezing and frost heaving and other freeze injury phenomenon caused by deformation joint, to ensure the driving safety of cold region tunnel road.

Description

Technical Field

[0001] This invention relates to the field of underground energy engineering technology, specifically to an antifreeze device for drainage channels in cold-region energy tunnels and its construction method. Background Technology

[0002] Energy tunnel technology combines a ground source heat pump system with the lining structure of a tunnel project. It utilizes shallow geothermal energy in the surrounding rock or soil to cool or heat the tunnel interior. It is a new technology that is energy-saving, emission-reducing, and has low operating costs.

[0003] Due to the effects of freeze-thaw cycles, the main structure of tunnels is prone to failure of the drainage system, leading to hazards such as ice accumulation on the tunnel arch, freezing of drainage ditches, and frost heave at expansion joints, which endanger traffic safety. Furthermore, the heat exchange pipes in energy tunnels are mainly located between the primary and secondary linings, as well as between the invert arch and the backfill layer. Insufficient heating of the drainage channels may still result in frost damage. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides an antifreeze device and construction method for drainage channels in cold-region energy tunnels, solving the problem of insufficient heating of drainage channels in cold-region energy tunnels leading to drainage system failure and frost damage.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, a cold-region energy tunnel drainage channel antifreeze device is provided, which includes multiple heat exchange pipe groups. The multiple heat exchange pipe groups are connected to a heat pump unit through an inlet pipe and a return pipe. The heat exchange pipe groups include a left heat exchange pipe group and a right heat exchange pipe group buried around the drainage channels on both sides. The left heat exchange pipe group and the right heat exchange pipe group are connected by two first heat exchange pipes buried in the road surface layer. The two first heat exchange pipes are connected by a second heat exchange pipe buried in the road surface layer.

[0007] This invention involves burying heat exchange pipe assemblies around the drainage channel and the road surface layer to heat the drainage channel and the road surface layer, preventing the road surface of tunnels in cold regions from freezing or the drainage from failing, and preventing frost damage such as ice accumulation on the tunnel arch, freezing of ditches and frost heave of expansion joints, so as to ensure the safety of driving on roads in tunnels in cold regions.

[0008] Furthermore, both the left and right heat exchanger groups include two U-shaped heat exchanger tubes arranged opposite each other, and the two U-shaped heat exchanger tubes are connected by a third heat exchanger tube.

[0009] In this scheme, the two U-shaped heat exchange pipes are connected by a third heat exchange pipe. By adopting the above scheme, the connection between the two U-shaped heat exchange pipes and the third heat exchange pipe forms a drainage channel for heating, preventing the drainage system from failing.

[0010] Furthermore, the U-shaped heat exchange tube is provided with a connection port, and the two ends of the first heat exchange tube are respectively connected to the connection port.

[0011] In this scheme, the two ends of the first heat exchange pipe are connected to connection ports respectively. By adopting the above scheme, the first heat exchange pipe and the second heat exchange pipe provide heating for the road surface layer to prevent the road surface of tunnels in cold regions from freezing and endangering the safety of road traffic.

[0012] Furthermore, water flow interfaces are respectively provided on the two U-shaped heat exchange tubes located in the right heat exchange tube group. The inlet pipe is connected to the water flow interface on one U-shaped heat exchange tube, and the return pipe is connected to the water flow interface on the other U-shaped heat exchange tube.

[0013] In this scheme, the inlet pipe and return pipe are respectively connected to the water flow interface on the two U-shaped heat exchange pipes, so that a closed loop is formed between the heat exchange pipe group and the heat pump unit.

[0014] Furthermore, the inlet and outlet pipes are located within the drainage channel, and both the inlet and outlet pipes have thermal insulation and waterproofing layers on their outer walls.

[0015] In this solution, both the inlet and return water pipes are equipped with thermal insulation and waterproof layers on their outer walls. The thermal insulation and waterproof layers mainly serve to insulate the pipes and prevent them from coming into direct contact with the outside environment, which could cause the circulating fluid inside the pipes to solidify, fail, or even crack. They also provide moisture-proof and waterproof protection for the pipes.

[0016] Furthermore, the heat pump unit is equipped with heating wires inside its water tank, which are connected to an external power source via an intelligent temperature controller.

[0017] In this scheme, the water tank of the heat pump unit is equipped with an electric heating wire. Using the above scheme, the electric heating wire heats the water in the water tank, and then the water heats the circulating liquid in the heat exchange tube. The heated circulating liquid flows with the pipes to heat the drainage channel, thereby improving the heating efficiency of the heat pump unit.

[0018] Furthermore, a temperature sensor is installed inside the drainage channel, and the temperature sensor is connected to the intelligent temperature controller.

[0019] In this scheme, a temperature sensor is installed in the drainage channel. Using the above scheme, the temperature sensor can sense and detect the temperature of the drainage channel and heat exchange pipe group in real time, so as to make timely adjustments.

[0020] Furthermore, the circulating fluid used in the heat pump unit is a mixture of ethylene glycol and soft water.

[0021] In this scheme, the circulating fluid is a mixture of ethylene glycol and soft water. By adopting the above scheme, the freezing point of the circulating fluid is lowered, and solidification of the circulating fluid is prevented.

[0022] On the other hand, a construction method for using an antifreeze device for drainage channels in cold-region energy tunnels is provided, which includes the following steps:

[0023] S1: Pour the backfill layer of the invert arch and reserve drainage channel trenches on both sides of the tunnel. Bury the left and right exchange pipe groups in the drainage channel trenches on both sides.

[0024] S2: Construction layout of buried heat exchange pipes, including the third heat exchange pipe around the drainage channel as well as the first and second heat exchange pipes, and design of the side wall fixtures of the drainage channel;

[0025] S3: Pour the drainage channel and cure it. After it hardens, construct the road surface layer, install the inlet and outlet pipes in the right drainage channel, connect them to the water flow interface of each right exchange pipe group, and apply the external rigid insulation layer to the pipes.

[0026] S4: Install temperature sensors, heat pump units and intelligent temperature controllers, and connect the inlet and outlet water pipes to the heat pump units.

[0027] S5: Check the sealing of each interface and the circuit structure, install the drainage channel cover, and complete the construction of the device;

[0028] S6: Start the heat pump unit to use geothermal energy to heat the drainage channel.

[0029] Furthermore, the temperature sensor in S6 collects the temperature information of the drainage channel and heat exchange tube group in real time. When the temperature collected by the temperature sensor is lower than the critical temperature, the heat pump unit is started to heat the drainage channel. When the heating preset time has elapsed and the temperature collected by the temperature sensor is lower than the preset temperature of the intelligent temperature controller, the intelligent temperature controller controls the start of the electric heating wire auxiliary heat pump unit.

[0030] This invention discloses an antifreeze device for drainage channels in energy tunnels in cold regions and its construction method, the beneficial effects of which are:

[0031] This invention involves burying heat exchange pipe assemblies around drainage channels and on the road surface, connecting these assemblies to a heat pump unit to create a heating system primarily powered by a ground source heat pump and supplemented by electricity. This system saves energy, reduces emissions, and protects the environment. It heats the drainage channels and road surface, and temperature sensors can detect and monitor the temperature of the drainage channels and heat exchange pipe assemblies in real time for timely adjustments. This prevents freezing of the road surface or drainage failure in cold regions, and avoids frost damage such as ice accumulation on the tunnel arch, freezing of ditches, and frost heave at expansion joints, thus ensuring safe driving in tunnels in cold regions. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the structure of an antifreeze device for drainage channels in cold-region energy tunnels according to the present invention.

[0033] Figure 2 This is a cross-sectional schematic diagram of the heat exchange tube assembly of the present invention.

[0034] Figure 3 This is a schematic diagram of the left exchange tube assembly of the present invention.

[0035] Figure 4 This is a schematic diagram of the right-side switching tube assembly of the present invention.

[0036] Figure 5 This is a schematic diagram of the installation of the first heat exchange tube of the present invention.

[0037] Figure 6 This is a schematic diagram of the structure of the third heat exchange tube of the present invention.

[0038] Among them, 1. Heat exchange tube assembly; 2. Right heat exchange tube assembly; 3. Left heat exchange tube assembly; 4. U-shaped heat exchange tube; 41. Connection port; 42. Water flow interface; 5. Third heat exchange tube; 6. First heat exchange tube; 7. Second heat exchange tube; 8. Heat pump unit; 9. Road surface layer; 10. Drainage channel; 11. Inlet pipe; 12. Return pipe. Detailed Implementation

[0039] The present invention is described in detail with reference to specific embodiments to enable those skilled in the art to understand the invention. However, it should be understood that the invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0040] Example 1

[0041] refer to Figure 1 and Figure 2 This is a schematic diagram of the structure of an antifreeze device for drainage channels in cold-region energy tunnels according to this embodiment. The purpose is to solve the problem of insufficient heating for drainage channels in cold-region energy tunnels, which leads to drainage system failure and frost damage. This embodiment will describe the specific structure of the antifreeze device in detail.

[0042] A cold-region energy tunnel drainage channel antifreeze device includes multiple heat exchange pipe groups 1, which are connected to a heat pump unit 8 through an inlet pipe 11 and a return pipe 12.

[0043] Specifically, the heat pump unit 8 adopts the existing water source heat pump / ground source heat pump unit equipment, the specific model of which is GSHP180. The heat exchange circulating liquid in the heat pump unit 8 starts from the heat pump unit 8, flows into each heat exchange tube group 1 through the water inlet pipe 11 in the drainage channel 10, and then flows back to the heat pump unit 8 through the return water pipe 12 for heat exchange.

[0044] The heat exchange pipe assembly 1 includes a left heat exchange pipe assembly 3 and a right heat exchange pipe assembly 2, which are buried around the drainage channels 10 on both sides respectively. The left heat exchange pipe assembly 3 and the right heat exchange pipe assembly 2 are connected by two first heat exchange pipes 6 buried in the road surface layer 9.

[0045] In this embodiment, a heat exchange pipe assembly 1 is buried around the drainage channel 10 and the road surface layer 9 to heat the area around the drainage channel 10 and the road surface layer 9, preventing the road surface of the tunnel in cold regions from freezing or the drainage from failing, and preventing freezing damage such as ice accumulation on the tunnel arch, freezing of ditches and freezing heave of expansion joints, so as to ensure the safety of driving in the tunnel in cold regions.

[0046] The two first heat exchange pipes 6 are connected by a second heat exchange pipe 7 buried in the road surface layer 9.

[0047] The inlet pipe 11 and the return pipe 12 are located inside the drainage channel 10, and both the inlet pipe 11 and the return pipe 12 are provided with a thermal insulation and waterproof layer on their outer walls.

[0048] In this embodiment, the thermal insulation and waterproof layer mainly protects the inlet pipe 11 and the return pipe 12, preventing them from directly contacting the outside world, which could cause the circulating liquid inside the pipe to solidify and fail or even crack. It also provides moisture-proof and waterproof protection for the pipes.

[0049] In this embodiment, the thermal insulation and waterproof layer consists of three layers. The innermost layer, which is in contact with the pipe, is the thermal insulation layer. The thermal insulation layer can be made of rigid polyurethane, which has a density of 35 kg / m³. 3 The thermal conductivity is 0.018 W / (m·K), the thickness of the insulation layer is 2 cm, and the outer two sides are waterproof layers. The waterproof layer can be made of LYX-603 chlorinated polyethylene.

[0050] The water tank of heat pump unit 8 is equipped with heating wires, which are connected to an external power source via an intelligent temperature controller.

[0051] In this embodiment, the heating wire heats the water in the water tank, and then the water heats the circulating liquid in the heat exchange tube. The heated circulating liquid flows through the pipe to heat the drainage channel 10, thereby improving the heating efficiency of the heat pump unit 8. The heating wire is made of iron-chromium-aluminum alloy, with a material of 0Cr21Al6Nb, a fast life of ≥50h, and an elongation of ≥12%.

[0052] A temperature sensor is installed in the drainage channel 10. The temperature sensor is connected to the intelligent temperature controller. The temperature sensor can sense and detect the temperature of the drainage channel 10 and the heat exchange tube group 1 in real time so as to make timely adjustments. In this embodiment, both the temperature sensor and the intelligent temperature controller adopt existing technologies. The temperature sensor adopts an existing thermistor temperature sensor, specifically model TH-44004-40-T; the intelligent temperature controller adopts an existing intelligent temperature controller, specifically model CH402FK02-M GN.

[0053] Temperature sensors are installed in the drainage channel 10, the heat exchange pipe group 1, and the tunnel to collect temperature information. The intelligent temperature controller sets a critical temperature and a preset temperature. When the temperature information collected by the temperature sensor is lower than the critical temperature, the heat pump unit 8 is started. After the heat pump unit 8 has been running for a period of time, when the temperature information collected by the temperature sensor is lower than the preset temperature, the heating wire is activated.

[0054] The circulating fluid used in the heat pump unit 8 is a mixture of ethylene glycol and soft water. In this embodiment, the circulating fluid used in the heat pump unit 8 is a mixture of 40% ethylene glycol and 60% soft water, which can lower the freezing point of the circulating fluid and prevent the circulating fluid from solidifying.

[0055] Example 2

[0056] refer to Figures 3-6 This is a schematic diagram of the heat exchange pipe assembly 1 in this embodiment. Its purpose is to heat the area around the drainage channel 10 and the road surface layer 9 to prevent the road surface of the tunnel in cold regions from freezing or the drainage from failing. This embodiment provides a further solution for the heat exchange pipe assembly 1.

[0057] Both the left heat exchanger group 3 and the right heat exchanger group 2 include two U-shaped heat exchanger tubes 4 arranged opposite each other.

[0058] Specifically, the two U-shaped heat exchange tubes 4, which are set opposite to each other, are connected by a third heat exchange tube 5.

[0059] In this embodiment, two U-shaped heat exchange pipes 4 and a third heat exchange pipe 5 are connected to form a drainage channel 10 for heating to prevent the drainage system from failing. There are two third heat exchange pipes 5, located below the drainage channel 10 and outside the drainage channel 10 (near the lining) respectively. The middle of the third heat exchange pipe 5 is a U-shaped pipe, which can increase the heat exchange area.

[0060] The U-shaped heat exchange tube 4 is provided with a connection port 41, and the two ends of the first heat exchange tube 6 are respectively connected to the connection port 41.

[0061] In this embodiment, reference Figures 3-5The U-shaped heat exchange pipe 4 is provided with two connection ports 41, which connect two layers of first heat exchange pipe 6 and second heat exchange pipe 7. The second heat exchange pipe 7 is a U-shaped pipe to increase the contact area with the road surface layer 9 and increase the heat exchange area. The first heat exchange pipe 6 and the second heat exchange pipe 7 provide heating for the road surface layer 9 to prevent the road surface from freezing in cold regions and endangering the safety of road traffic.

[0062] The outer walls of the U-shaped heat exchange pipe 4, the first heat exchange pipe 6, and the second heat exchange pipe 7 are all wrapped with a protective layer. The protective layer is made of a highly elastic material, specifically high-strength ethylene propylene diene monomer (EPDM) rubber. The protective layer plays a role in deformation coordination, reducing the internal stress of the structure caused by temperature changes, and at the same time protecting the pavement layer 9.

[0063] Water inlets 42 are provided on the two U-shaped heat exchange tubes 4 of the right heat exchange tube group 2. The inlet pipe 11 is connected to the water inlet 42 on one U-shaped heat exchange tube 4, and the return pipe 12 is connected to the water inlet 42 on the other U-shaped heat exchange tube 4.

[0064] In this embodiment, the inlet pipe 11 and the return pipe 12 are respectively connected to the water flow interface 42 on the two U-shaped heat exchange pipes 4 in the right heat exchange pipe group 2, so that a closed loop is formed between the heat exchange pipe group 1 and the heat pump unit 8, so that the heat pump unit 8 can heat the heat exchange pipe group 1.

[0065] Example 3

[0066] This embodiment provides a construction method for using an antifreeze device for drainage channels in cold-region energy tunnels, which includes the following steps:

[0067] S1: Pour the backfill layer of the invert arch and reserve drainage channels 10 trenches on both sides of the tunnel. Bury the left exchange pipe group 3 and the right exchange pipe group 2 in the drainage channels 10 trenches on both sides.

[0068] S2: Construction layout of buried heat exchange pipes, including the third heat exchange pipe 5 around the drainage channel 10, as well as the first heat exchange pipe 6 and the second heat exchange pipe 7, and design of the side wall fixtures of the drainage channel 10.

[0069] S3: Pour the drainage channel 10 and cure it. After it hardens, construct the road surface layer 9. The concrete grade used for both should be the same. Install the inlet pipe 11 and the return pipe 12 in the right drainage channel 10 and connect them to the water flow interface 42 of each right exchange pipe group 2 respectively. Apply a hard insulation layer to the outside of the pipe.

[0070] This step can be arranged according to the regional characteristics, with a group of heat exchange tubes 1 arranged every 5m, including U-shaped heat exchange tube 4, first heat exchange tube 6, and second heat exchange tube 7. Each group of heat exchange tubes 1 is connected to the heat pump unit 8 through the inlet pipe 11 and the return pipe 12. The heat exchange circulating liquid starts from the heat pump unit 8, flows into each heat exchange tube group 1 through the inlet pipe 11 in the drainage channel 10, and then flows back to the heat pump unit 8 through the return pipe 12.

[0071] S4: Install a temperature sensor, heat pump unit 8 and intelligent temperature controller, and connect the inlet pipe 11 and return pipe 12 to heat pump unit 8.

[0072] S5: Check the sealing of each interface and the circuit structure, install the drainage channel 10 cover plate, and complete the construction of the device.

[0073] S6: Start the heat pump unit 8 to use geothermal energy to heat the drainage channel 10.

[0074] In S6, the temperature sensor collects the temperature information of the drainage channel 10 and the heat exchange tube group 1 in real time. When the temperature collected by the temperature sensor is lower than the critical temperature, the heat pump unit 8 is started to heat the drainage channel 10. After a preset heating period, when the temperature collected by the temperature sensor is lower than the preset temperature of the intelligent temperature controller, the intelligent temperature controller controls the start of the electric heating wire auxiliary heat pump unit 8.

[0075] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A frost-proof device for drainage channels in energy tunnels in cold regions, characterized in that: It includes multiple heat exchange tube assemblies (1), and the multiple heat exchange tube assemblies (1) are connected to the heat pump unit (8) through inlet water pipe (11) and return water pipe (12); The heat exchange pipe assembly (1) includes a left exchange pipe assembly (3) and a right exchange pipe assembly (2) respectively buried around the drainage channels (10) on both sides. The left heat exchanger group (3) and the right heat exchanger group (2) are connected by two first heat exchanger pipes (6) buried in the road surface layer (9); The two first heat exchange pipes (6) are connected by a second heat exchange pipe (7) buried in the road surface layer (9); The left heat exchange tube group (3) and the right heat exchange tube group (2) each include two U-shaped heat exchange tubes (4) arranged opposite each other, and the two U-shaped heat exchange tubes (4) are connected by a third heat exchange tube (5); The inlet pipe (11) and return pipe (12) are located inside the drainage channel (10), and the outer walls of the inlet pipe (11) and return pipe (12) are provided with a heat insulation layer. The U-shaped heat exchange tube (4) is provided with a connection port (41), and the two ends of the first heat exchange tube (6) are respectively connected to the connection port (41). Water flow interfaces (42) are respectively provided on the two U-shaped heat exchange tubes (4) located in the right heat exchange tube group (2). The water inlet pipe (11) is connected to the water flow interface (42) on one U-shaped heat exchange tube (4), and the water return pipe (12) is connected to the water flow interface (42) on the other U-shaped heat exchange tube (4).

2. The antifreeze device for drainage channels in cold-region energy tunnels according to claim 1, characterized in that: The heat pump unit (8) is equipped with an electric heating wire in its water tank, and the electric heating wire is connected to an external power source through an intelligent temperature controller.

3. The antifreeze device for drainage channels in cold-region energy tunnels according to claim 2, characterized in that: A temperature sensor is installed in the drainage channel (10), and the temperature sensor is connected to the intelligent temperature controller.

4. The antifreeze device for drainage channels in cold-region energy tunnels according to claim 1, characterized in that: The circulating fluid in the heat pump unit (8) is a mixture of ethylene glycol and soft water.

5. A construction method for using the antifreeze device for drainage channels in cold-region energy tunnels according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Pour the backfill layer of the invert arch and reserve drainage channels (10) trenches on both sides of the tunnel. Bury the left exchange pipe group (3) and the right exchange pipe group (2) in the drainage channels (10) trenches on both sides. S2: Construction layout of buried heat exchange pipes, including the third heat exchange pipe (5) around the drainage channel (10) and the first heat exchange pipe (6) and the second heat exchange pipe (7), and the side wall fixtures of the drainage channel (10) are designed; S3: Pour the drainage channel (10) and maintain it. After it hardens, construct the road surface layer (9), install the inlet pipe (11) and return pipe (12) in the right drainage channel (10), connect them to the water flow interface (42) of each right exchange pipe group (2), and apply the external hard insulation layer of the pipe. S4: Install temperature sensors, heat pump unit (8) and intelligent temperature controller, and connect water inlet pipe (11) and water return pipe (12) to heat pump unit (8); S5: Check the sealing of each interface and the circuit structure, construct the drainage channel (10) cover plate, and complete the construction of the device; S6: Start the heat pump unit (8) to use ground source heat energy to heat the drainage channel (10).

6. The construction method for using an antifreeze device for drainage channels in cold-region energy tunnels according to claim 5, characterized in that: In S6, the temperature sensor collects the temperature information of the drainage channel (10) and the heat exchange tube group (1) in real time. When the temperature collected by the temperature sensor is less than the critical temperature, the heat pump unit (8) is started to heat the drainage channel (10). When the heating preset time has passed and the temperature collected by the temperature sensor is less than the preset temperature of the intelligent temperature controller, the intelligent temperature controller controls the start of the electric heating wire auxiliary heat pump unit (8).

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