Laying method of tunnel portal pavement geothermal ice melting pipeline

Abstract

The invention belongs to the technical field of tunnel ice melting, and particularly relates to a laying method of a tunnel portal road surface geothermal ice melting pipeline, and the tunnel portal road surface geothermal ice melting pipeline comprises a heat taking unit, a heat supply unit and a control device; the heat removal unit comprises a heat removal pipe, a first pressure monitor and a first circulating water pump. The heat supply unit comprises a heat exchange unit, a heat collection water tank, a second circulating water pump, a second pressure monitor, a temperature monitor, a main water inlet pipe, a main water outlet pipe and a road heat exchange pipe. The road heat exchange pipe is mounted in a cement concrete surface layer included in the cement concrete asphalt road; the cement concrete asphalt road comprises a road soil base layer, a road cushion layer, a cement concrete base layer, a heat insulation layer, a cement concrete surface layer, an asphalt lower surface layer and an asphalt upper surface layer which are sequentially formed from bottom to top. The device extracts terrestrial heat and transmits the terrestrial heat to an ice and snow layer on the road surface to achieve the purpose of melting ice and snow; and controlling the whole tunnel portal pavement geothermal ice melting pipeline according to the pressure change and the temperature change.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel ice melting, and in particular relates to a method for laying a geothermal ice melting pipeline on a tunnel entrance pavement. Background Art

[0002] In some parts of northern my country, the winter climate is extremely cold, and ice often forms on the road surface at the entrance of tunnels, which can easily lead to traffic accidents such as vehicle loss of control, skidding, and rear-end collisions, posing a serious threat to driving safety. Therefore, in order to reduce the impact of ice on traffic safety, it is crucial to take measures to melt the ice on the road surface at the entrance of tunnels.

[0003] At present, road snow melting and deicing technology is mainly divided into two categories: passive snow melting and deicing technology and active snow melting technology. Passive snow melting and deicing technology has some problems: environmental pollution, high cost and limited use conditions. Active snow melting technology includes carbon fiber electric heating method and geothermal buried pipe method. However, carbon fiber heating cable is expensive, consumes a lot of electricity when working, and consumes a lot of energy; the existing geothermal buried pipe method of snow melting and deicing, its geothermal ice melting pipe is laid on the entire road surface, and its laying method is unreasonable, resulting in a waste of resources; at the same time, for cement concrete asphalt road structure, due to the laying of road heat exchange pipes 2-4cm below the upper surface of the cement concrete surface layer, the problem of cutting the heat exchange pipe when cutting the shrinkage joints and longitudinal joints in the transverse joints during actual construction is not considered. In summary, when designing and constructing geothermal pipes on the tunnel entrance pavement, it is necessary to design a specific method for laying geothermal ice melting pipes to avoid some problems encountered during construction and actual use through advance design. Summary of the invention

[0004] In view of the shortcomings and defects in the prior art, the purpose of the present invention is to provide a method for laying geothermal ice-melting pipes on the pavement of a tunnel entrance. The geothermal ice-melting pipes on the pavement of the tunnel entrance are laid, and a standard module of heat exchange pipes is arranged at the center of the vehicle wheel track. The range of snow and ice melting can enable the vehicle to drive normally, which not only reduces the consumption of materials, but also makes the laying method more convenient, saving a lot of manpower and material resources.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A tunnel entrance pavement geothermal ice-melting pipeline comprises a heat extraction unit, a heat supply unit and a control device.

[0007] The heat extraction unit includes a heat extraction pipe, a first pressure monitor, and a first circulating water pump. The heat extraction pipe is buried to extract geothermal heat, and the heat extraction pipe is composed of parallel U-shaped PE pipes. The first circulating water pump is installed on the output end of the heat extraction pipe to ensure the normal circulation of water in the heat extraction section. The first pressure monitor is installed on the input end of the heat extraction pipe to monitor the water pressure. The water that extracts geothermal heat flows into the heat exchange unit after passing through the first circulating water pump, flows out after heat exchange in the heat exchange unit, and then returns to the heat extraction pipe through the first pressure monitor to extract geothermal heat.

[0008] The heating unit includes a heat exchanger unit, a heat collection tank, a second circulating water pump, a second pressure monitor, a temperature monitor, a main water inlet pipe, a main water outlet pipe and a road heat exchange pipe. The water that has undergone heat exchange in the heat exchanger unit flows out of the heat exchanger unit, passes through the heat collection tank, the second circulating water pump, the main water inlet pipe, the road heat exchange pipe, the main water outlet pipe and the second pressure monitor in sequence, and then flows into the heat exchanger unit for heat exchange to form a heat and mass circulation system. The heat collection tank stores the water that has undergone heat exchange in the heat exchanger unit, the second circulating water pump provides power to ensure the normal circulation of water in the heating unit, and the second pressure monitor monitors the pressure of water in the pipeline of the heating unit.

[0009] The road heat exchange pipe is installed in the cement concrete surface layer of the cement concrete asphalt road. The cement concrete asphalt road includes a road soil base layer, a road cushion layer, a cement concrete base layer, a heat insulation layer, a cement concrete surface layer, an asphalt lower layer, and an asphalt upper layer formed in sequence from bottom to top.

[0010] A road heat exchange pipe is laid below the upper surface of the cement concrete surface layer. The heat in the road heat exchange pipe is transferred to the lower asphalt layer and the upper asphalt layer through the cement concrete surface layer, and finally to the ice and snow layer on the surface of the cement concrete asphalt road to achieve the purpose of melting snow and ice.

[0011] The road heat exchange tube is composed of a heat exchange tube standard module and connecting tubes Ⅰ, Ⅱ, Ⅲ and Ⅳ. Figure 4 The heat exchange tube standard module is composed of two U-shaped 304 threaded tubes connected in series. The heat exchange tube standard module is arranged at the center line of the vehicle wheel track of the lane. Figure 4 As shown. Figure 4-6 ,

[0012] The above-mentioned method for laying a geothermal ice-melting pipeline on a tunnel entrance road surface comprises the following steps:

[0013] Step 1: According to the requirements of the specifications, the road cushion layer and cement concrete base layer are laid on the road soil base layer in sequence. After the cement concrete base layer is laid, the insulation material is laid on it to form an insulation layer.

[0014] Step 2: After the insulation layer is laid, a steel support is placed on it; after the steel support is laid, the standard module of the heat exchange tube is tied to the upper surface of the steel support, and the standard module of the heat exchange tube is connected into a whole through connecting pipes I, II, III, and IV, that is, a road heat exchange tube is formed, wherein connecting pipe III is tied below the upper surface of the steel support, such as Figure 5-6 .

[0015] Step 3: Conduct a water pressure test on the connected road heat exchange pipe to check for leaks and normal water pressure to ensure safety.

[0016] Step 4: Pour the cement concrete surface layer to reach the designed elevation. When the cement concrete reaches 25%-30% of the designed strength, use a cutting machine to cut the road transverse joints and road longitudinal joints. After cutting, fill the road transverse joints and road longitudinal joints with joint fillers. Then, lay the asphalt lower layer and asphalt upper layer on the cement concrete surface layer in sequence. After laying, compact it to complete the laying of cement concrete asphalt road.

[0017] Step 5:

[0018] Holes are drilled outside the cement concrete asphalt road, and U-shaped PE pipes are buried to form heat extraction pipes. The first circulating water pump is installed at the outlet end of the heat extraction pipe, and the first pressure monitor is installed at the inlet end. The heat exchange unit is installed and connected to the heat extraction pipe through pipes to complete the layout of the heat extraction unit. The heat collection tank, the main water inlet pipe and the main water outlet pipe are installed, and the main water inlet pipe is connected to the connecting pipe Ⅰ, and the main water outlet pipe is connected to another connecting pipe Ⅰ. Then, the heat exchange unit, the heat collection tank, the temperature sensor, the second circulating water pump, and the main water inlet pipe are connected in sequence with pipes. Then, the main water outlet pipe, the temperature sensor, the second pressure monitor, and the heat exchange unit are connected in sequence with pipes to form a heat and mass circulation system to complete the layout of the heating unit. Finally, the geothermal ice melting system control device is installed to complete the installation of the geothermal ice melting pipeline on the entire tunnel entrance road surface.

[0019] Step 6: Complete the commissioning and acceptance of the geothermal ice-melting pipeline on the tunnel entrance pavement.

[0020] Preferably, the heat collecting tank can also perform secondary heating on the water.

[0021] Preferably, a temperature sensor is installed on the pipeline between the heat collection tank and the second circulating water pump. Similarly, another temperature sensor is installed on the input end pipeline of the second pressure monitor. The temperature sensor transmits data to the temperature monitor to monitor the temperature of the water in the main water inlet pipe and the main water outlet pipe.

[0022] Preferably, a temperature sensor is installed in the asphalt upper layer of the cement concrete asphalt road to transmit data to the temperature monitor to monitor the temperature of the cement concrete asphalt road surface.

[0023] Preferably, the main water inlet pipe and the main water outlet pipe are arranged on one side of the cement concrete asphalt road close to the heat extraction unit. Due to the influence of the ambient temperature, a layer of thermal insulation cotton is wrapped on the outer surface of the main water inlet pipe and the main water outlet pipe to prevent heat loss.

[0024] Preferably, multiple rows of standard heat exchange tube modules are laid on each lane, and each row of standard heat exchange tube modules is composed of two standard heat exchange tube modules connected in series through connecting pipe II. Adjacent standard heat exchange tube modules on different lanes are connected in series by connecting pipe III. Thus, every two rows of standard heat exchange tube modules form a heat and mass circulation pipeline, the water inlet end of the heat and mass circulation pipeline is connected to the main water inlet pipe through connecting pipe I, and the water outlet end is connected to the main water outlet pipe through another connecting pipe I. The two rows of standard heat pipe modules are connected in series through connecting pipe IV.

[0025] Preferably, the control device is a geothermal ice-melting system control device, and its working process is as follows: when the temperature sensor detects that the surface temperature of the cement concrete asphalt road has dropped to 2°C, the temperature monitor transmits a signal to the geothermal ice-melting system control device, and the geothermal ice-melting system control device starts the first circulating water pump, the second circulating water pump, and the heat exchange unit to ensure the normal operation of the heat extraction unit and the heat supply unit; when encountering extremely cold weather, the heat provided by the heat extraction unit cannot meet the ice melting demand, and the temperature monitor detects that the surface temperature of the cement concrete asphalt road has been below 0°C for more than 10 hours, the geothermal ice-melting system control device turns on the heating switch of the water collection tank, reheats the water of the heat supply unit, and increases the temperature to achieve the purpose of melting snow and ice; during the operation of the geothermal ice-melting pipeline on the tunnel entrance pavement, the first pressure monitor of the heat extraction unit and the second pressure monitor of the heat supply unit monitor the pressure. When abnormal water pressure is detected, a signal is transmitted to the geothermal ice-melting system control device, and the geothermal ice-melting system control device immediately closes the entire tunnel entrance pavement geothermal ice-melting pipeline to prevent safety accidents. Subsequent staff can perform inspection and maintenance according to the abnormal pressure monitoring.

[0026] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0027] 1. When the road ice melting fails to meet the requirements, the heat collecting tank of the present invention can start the heating function of the heat collecting tank to reheat the water therein, and then transport it to the road heat exchange pipe to melt snow and ice.

[0028] 2. The heat extraction unit and the heat supply unit of the present invention are both equipped with a pressure monitor. Once the pressure monitor detects abnormal water pressure in the pipeline, the signal will be transmitted to the control device, and the control device will immediately shut down the operation of the geothermal ice-melting pipeline on the road surface of the entire tunnel entrance to ensure operational safety and facilitate subsequent maintenance work.

[0029] 3. The laying method of road heat exchange pipes has been optimized. Standard modules of heat exchange pipes are laid out in the center of the vehicle wheel track. The range of snow and ice melting can enable vehicles to drive normally. This not only reduces material consumption, but also makes the laying method more convenient and saves a lot of manpower and material resources.

[0030] 4. At the same time, the problem of cutting the heat exchange tubes when cutting the road transverse joints (contraction joints) and road longitudinal joints during the actual construction process is taken into consideration. For the road transverse joints and road longitudinal joints, the paving path is designed to avoid cutting the heat exchange tubes during cutting.

[0031] 5. The road heat exchange tube adopts No. 304 threaded tube, which has the advantage of not only being well bonded with cement concrete, but also having good heat transfer efficiency.

[0032] 6. Each set of No. 304 threaded pipe standard modules is processed in the factory and can be directly transported to the construction site for assembly. After assembly, it is fixed on the steel support and then poured with cement concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a three-dimensional schematic diagram of the geothermal ice-melting pipeline on the tunnel entrance pavement.

[0034] Figure 2 This is an overhead view of the geothermal ice-melting pipe on the tunnel entrance pavement.

[0035] Figure 3 This is a cross-sectional view of a cement concrete asphalt road.

[0036] Figure 4 This is a schematic diagram of the pipeline plan of the heating unit between two road cross joints in a cement concrete asphalt road.

[0037] Figure 5 It is a three-dimensional schematic diagram of the pipeline of the heating unit between two road cross joints in a cement concrete asphalt road.

[0038] Figure 6 This is an overhead view of the pipes of the heating unit between two road cross joints in a cement concrete asphalt road.

[0039] Figure 7 This is a schematic plan view of the standard module of the heat exchange tube.

[0040] Numbers in the figure: 1-road soil base, 2-road cushion, 3-cement concrete base, 4-insulation layer, 5-cement concrete surface layer, 6-asphalt lower layer, 7-asphalt upper layer, 8-maintenance road, 9-road heat exchange pipe, 10-heat extraction pipe, 11-first pressure monitor, 12-first circulating water pump, 13-heat exchange unit, 14-heat collecting tank, 15-second circulating water pump, 16-second pressure monitor, 17-temperature monitor, 18-main water inlet pipe, 19-main water outlet pipe, 20-control device, 21-road transverse joint, 22-road longitudinal joint, 23-lateral template, 24-vehicle wheel track center line, 25-connecting pipe I, 26-connecting pipe II, 27-connecting pipe III, 28-connecting pipe IV, 29-driving direction, 30-heat exchange pipe standard module. DETAILED DESCRIPTION

[0041] The laying method of the heat exchange tubes of the present invention will be described in detail below in conjunction with a tunnel pavement example and accompanying drawings.

[0042] like Figure 1 As shown, a tunnel entrance pavement geothermal ice-melting pipeline includes a heat extraction unit, a heat supply unit and a control device.

[0043] The heat extraction unit includes a heat extraction pipe 10, a first pressure monitor 11, and a first circulating water pump 12. The heat extraction pipe 10 is buried to extract geothermal heat, and the heat extraction pipe 10 is composed of parallel U-shaped PE pipes. The first circulating water pump 12 is installed on the output end of the heat extraction pipe 10 to ensure the normal circulation of water in the heat extraction section. The first pressure monitor 11 is installed on the input end of the heat extraction pipe 10 to monitor the water pressure. The water that extracts geothermal heat flows into the heat exchange unit 13 after passing through the first circulating water pump 12, flows out after heat exchange in the heat exchange unit 13, and then returns to the heat extraction pipe 10 through the first pressure monitor 11 to extract geothermal heat.

[0044] The heating unit includes a heat exchanger unit 13, a heat collection tank 14, a second circulating water pump 15, a second pressure monitor 16, a temperature monitor 17, a main water inlet pipe 18, a main water outlet pipe 19 and a road heat exchange pipe 9. The water that has undergone heat exchange in the heat exchanger unit 13 flows out of the heat exchanger unit 13, passes through the heat collection tank 14, the second circulating water pump 15, the main water inlet pipe 18, the road heat exchange pipe 9, the main water outlet pipe 19 and the second pressure monitor 16 in sequence, and then flows into the heat exchanger unit 13 for heat exchange, forming a heat and mass circulation system. The heat collection tank 14 stores the water that has undergone heat exchange and flows out of the heat exchanger unit 13, and the heat collection tank 14 can perform secondary heating on the water. The second circulating water pump 15 provides power to ensure the normal circulation of water in the heating unit, and the second pressure monitor 16 monitors the pressure of the water in the pipeline of the heating unit. A temperature sensor is installed on the pipeline between the heat collecting tank 14 and the second circulating water pump 15. Similarly, another temperature sensor is installed on the input end pipeline of the second pressure monitor 16. The temperature sensor transmits data to the temperature monitor 17 to monitor the temperature of the water in the main water inlet pipe 18 and the main water outlet pipe 19.

[0045] The road heat exchange pipe 9 is installed in the cement concrete surface layer 5 included in the cement concrete asphalt road. The cement concrete asphalt road includes a road soil base layer 1, a road cushion layer 2, a cement concrete base layer 3, a heat insulation layer 4, a cement concrete surface layer 5, an asphalt lower layer 6, and an asphalt upper layer 7 formed in sequence from bottom to top. The road heat exchange pipe 9 is laid at a depth of 2 cm below the upper surface of the cement concrete surface layer 5. The heat in the road heat exchange pipe 9 is transferred to the asphalt lower layer 6 and the asphalt upper layer 7 through the cement concrete surface layer 5, and finally transferred to the ice and snow layer on the surface of the cement concrete asphalt road to achieve the purpose of melting snow and ice. A temperature sensor is installed in the asphalt upper layer 7 of the cement concrete asphalt road to transmit data to the temperature monitor 17 to monitor the temperature of the cement concrete asphalt road surface. The main water inlet pipe 18 and the main water outlet pipe 19 are arranged on the side of the cement concrete asphalt road close to the heat extraction unit. Due to the influence of the ambient temperature, a layer of thermal insulation cotton is wrapped on the outer surface of the main water inlet pipe 18 and the main water outlet pipe 19 to prevent heat loss.

[0046] The road heat exchange pipe 9 is composed of a heat exchange pipe standard module 30 and a connecting pipe I 25, a 1.35 m connecting pipe II 26, a 1.25 m connecting pipe III 27, and a 10 cm connecting pipe IV 28. Figure 4 The heat exchange tube standard module 30 is composed of two U-shaped 304 threaded tubes connected in series. The dimensions of the heat exchange tube standard module 30 are 2.4m long and 47cm wide. The center lines of the two tubes in the U-shaped 304 threaded tube are 15cm apart and the tube diameter is 20mm. Figure 7The heat exchange tube standard module 30 is arranged at the center line 24 of the vehicle track. The center line 24 of the vehicle track near the edges of the cement concrete asphalt road is 0.85m away from the side templates 23 on both sides of the cement concrete asphalt road. The center lines 24 of adjacent vehicle track in a lane are 1.8m apart. Figure 4 As shown. Figure 4-6 The materials of the heat exchange tube standard module 30 and the connecting pipe 25 / 26 / 27 / 28 are all 304 threaded steel pipes with an outer diameter of 20mm and an inner diameter of 18mm. The advantages of the 304 threaded steel pipe are that it has a higher heat transfer coefficient and the thread shape can be combined with cement concrete. Multiple rows of heat exchange tube standard modules 30 are laid on each lane. Each row of heat exchange tube standard modules 30 is composed of two heat exchange tube standard modules 30 connected in series through a connecting pipe II 26, which is fixed on the upper surface of the steel support. The adjacent heat exchange tube standard modules 30 of different lanes are connected in series by a connecting pipe III 27. Thus, every two rows of heat exchange tube standard modules 30 form a heat and mass circulation pipeline. The water inlet end of the heat and mass circulation pipeline is connected to the main water inlet pipe 18 through a connecting pipe I 25, and the water outlet end is connected to the main water outlet pipe 19 through another connecting pipe I 25. The two rows of heat pipe standard modules 30 are connected in series through a connecting pipe IV 28. The road heat exchange pipe 9 forms a whole with the cement concrete as the cement concrete surface layer 5 is poured. The heat exchange pipe standard module 30 is 5 cm away from the road transverse joint 21. The longitudinal distance between two adjacent rows of heat exchange pipe standard modules 30 in a lane is 10 cm, and the transverse distance is 1.35 m. The longitudinal distance is the distance along the driving direction, and the transverse distance is the distance perpendicular to the driving direction. Figure 4-6 The figure captures a 5m section of the road heat exchange pipe 9 laying plan view, a three-dimensional view of the road heat exchange pipe 9 tied to the steel support, and a top view of the road heat exchange pipe 9 tied to the steel support.

[0047] Figure 1 It is the layout diagram of the geothermal ice-melting pipeline on the entire tunnel entrance road surface at the tunnel entrance. The laying range of the road heat exchange pipe 9 is from 10m outside the tunnel entrance to 10m inside the tunnel entrance, with a total length of 20m and a single lane width of 3.5m. Figure 4-6 It is a plan view and a stereoscopic view of the road heat exchange pipe 9 laid between adjacent transverse seams with an interval of 5m. 5m out of 20m is taken for illustration, and the remaining 15m is explained in the same way.

[0048] The control device 20 is a geothermal ice-melting system control device, which automatically opens and closes the geothermal ice-melting pipeline on the entire tunnel entrance pavement according to pressure changes and temperature changes. Its working process is as follows: when the temperature sensor detects that the surface temperature of the cement concrete asphalt road has dropped to 2°C, the temperature monitor 17 transmits a signal to the geothermal ice-melting system control device, and the geothermal ice-melting system control device starts the first circulating water pump 12, the second circulating water pump 15, and the heat exchange unit 13 to ensure the normal operation of the heat extraction unit and the heat supply unit; when encountering extremely cold weather, the heat provided by the heat extraction unit cannot meet the ice melting demand, and the temperature monitor 17 detects that the surface temperature of the cement concrete asphalt road has dropped to 2°C. When the temperature is below 0°C for more than 10 hours, the geothermal ice-melting system control device turns on the heating switch of the water collecting tank 14 to reheat the water in the heating unit to increase the temperature to achieve the purpose of melting snow and ice; during the operation of the geothermal ice-melting pipeline on the tunnel entrance pavement, the first pressure monitoring device 11 of the heat extraction unit and the second pressure monitoring device 16 of the heating unit monitor the pressure. When abnormal water pressure is detected, the signal is transmitted to the geothermal ice-melting system control device, and the geothermal ice-melting system control device immediately closes the entire geothermal ice-melting pipeline on the tunnel entrance pavement to prevent safety accidents. Subsequent staff can conduct inspection and maintenance according to the abnormal pressure monitoring.

[0049] The above-mentioned method for laying a geothermal ice-melting pipeline on the tunnel entrance road surface comprises the following steps:

[0050] Step 1:

[0051] According to the specification requirements, a 20 cm thick road cushion layer 2 and a 20 cm thick cement concrete base layer 3 are laid on the road soil base layer 1 in sequence. After the cement concrete base layer 3 is laid, a heat insulation material is laid thereon to form a 2 cm thick heat insulation layer 4.

[0052] Step 2:

[0053] After the insulation layer 4 is laid, a steel support is placed every 5 m thereon. The size of the steel support is 4.9 m long × 2.27 m wide × 0.22 m high. The distance between the steel support and the lateral formwork 23 on both sides of the cement concrete surface layer 5 is 0.615 m. After the steel support is laid, the heat exchange tube standard module 30 is tied to the upper surface of the steel support, and the heat exchange tube standard module 30 is connected into a whole through the connecting pipe I 25, the 1.35 m connecting pipe II 26, the 1.25 m connecting pipe III 27, and the 10 cm connecting pipe IV 28, i.e., the road heat exchange tube 9, wherein the connecting pipe III 27 is tied at a depth of 0.11 m below the upper surface of the steel support to prevent the connecting pipe III 27 from being cut when the road longitudinal seam 22 is cut. Figure 5-6At this time, make a mark on the side formwork 23 every 5m so that the joint can be cut after pouring the cement concrete. For the expansion joint of the road surface at the tunnel entrance, according to the requirements of the cement concrete pavement design specification, the construction is carried out according to the bracket fixing method, and the force transmission rod can be tied to the steel support.

[0054] Step 3:

[0055] The connected road heat exchange pipe 9 is subjected to a water pressure test to check whether there is any water leakage and whether the water pressure is normal to ensure safety.

[0056] Step 4:

[0057] A 26 cm thick cement concrete surface layer 5 is poured to reach the design elevation. When the cement concrete reaches 25%-30% of the design strength, a cutting machine is used to cut the road transverse joints 21 and the road longitudinal joints 22. After the cutting is completed, the road transverse joints 21 and the road longitudinal joints 22 are filled with joint fillers. Next, a 6 cm thick asphalt lower layer 6 and a 4 cm thick asphalt upper layer 7 are laid on the cement concrete surface layer 5 in sequence. After the laying is completed, compaction is carried out to complete the laying of the cement concrete asphalt road.

[0058] Step 5:

[0059] Drill a 100m deep hole outside the cement concrete asphalt road, bury a U-shaped PE pipe to form a heat extraction pipe 10, install the first circulating water pump 12 at the outlet end of the heat extraction pipe 10, install the first pressure monitor 11 at the inlet end, install the heat exchanger 13 and connect it to the heat extraction pipe 10 through a pipeline to complete the layout of the heat extraction unit. Install the heat collection tank 14, the main water inlet pipe 18 and the main water outlet pipe 19, connect the main water inlet pipe 18 to the connecting pipe Ⅰ25, and connect the main water outlet pipe 19 to another connecting pipe Ⅰ25. Then use pipelines to connect the heat exchanger 13, the heat collection tank 14, the temperature sensor, the second circulating water pump 15, the main water inlet pipe 18, and then use pipelines to connect the main water outlet pipe 19, the temperature sensor, the second pressure monitor 16, and the heat exchanger 13 in sequence to form a heat and mass circulation system to complete the layout of the heating unit. Finally, install the geothermal ice melting system control device to complete the installation of the geothermal ice melting pipeline on the entire tunnel entrance road surface.

[0060] Step 6:

[0061] The commissioning and acceptance of the geothermal ice-melting pipeline on the tunnel entrance pavement has been completed.

[0062] The above is a detailed description of a specific example of the present invention, and does not limit the scope of the present invention. Any changes or modifications made by any technician familiar with the field based on the technical content disclosed above should be regarded as equivalent effective implementation cases and fall within the scope covered by the technical solution of the present invention.

Claims

1. A method for laying a geothermal ice-melting pipeline on a tunnel entrance pavement, the geothermal ice-melting pipeline on the tunnel entrance pavement comprising a heat extraction unit, a heat supply unit and a control device; the heat extraction unit comprises a heat extraction pipe, a first pressure monitor and a first circulating water pump; the heat extraction pipe is composed of parallel U-shaped PE pipes, the first circulating water pump is installed on the output end of the heat extraction pipe, and the first pressure monitor is installed on the input end of the heat extraction pipe; the water for extracting geothermal heat flows into a heat exchange unit after passing through the first circulating water pump, flows out after heat exchange in the heat exchange unit, and then returns to the heat extraction pipe through the first pressure monitor to extract geothermal heat; The heating unit comprises a heat exchanger, a heat collecting tank, a second circulating water pump, a second pressure monitor, a temperature monitor, a main water inlet pipe, a main water outlet pipe and a road heat exchange pipe; the water after heat exchange in the heat exchanger flows out of the heat exchanger, passes through the heat collecting tank, the second circulating water pump, the main water inlet pipe, the road heat exchange pipe, the main water outlet pipe and the second pressure monitor in sequence, and then flows into the heat exchanger for heat exchange to form a heat and mass circulation system; the heat collecting tank stores the water flowing out of the heat exchanger after heat exchange, the second circulating water pump provides power, and the second pressure monitor monitors the pressure of the water in the pipeline of the heating unit; The road heat exchange pipe is installed in the cement concrete surface layer of the cement concrete asphalt road; the cement concrete asphalt road includes a road soil base layer, a road cushion layer, a cement concrete base layer, a heat insulation layer, a cement concrete surface layer, an asphalt lower layer, and an asphalt upper layer formed in sequence from bottom to top; A road heat exchange pipe is laid below the upper surface of the cement concrete surface layer. The heat in the road heat exchange pipe is transferred to the lower asphalt layer and the upper asphalt layer through the cement concrete surface layer, and finally transferred to the ice and snow layer on the surface of the cement concrete asphalt road. The road heat exchange pipe consists of a heat exchange pipe standard module and connecting pipes I, II, III and IV. The heat exchange pipe standard module is composed of two U-shaped No. 304 threaded pipes connected in series. The heat exchange pipe standard module is arranged at the center line of the vehicle wheel track of the driving lane. It is characterized in that The steps include: Step 1: According to the requirements of the specification, the road cushion layer and the cement concrete base layer are laid on the road soil base layer in sequence. After the cement concrete base layer is laid, the thermal insulation material is laid on it to form a thermal insulation layer; Step 2: After the insulation layer is laid, a steel support is placed on it; after the steel support is laid, the standard module of the heat exchange tube is tied to the upper surface of the steel support, and the standard module of the heat exchange tube is connected into a whole through connecting pipes I, II, III, and IV, that is, a road heat exchange tube is formed, wherein connecting pipe III is tied below the upper surface of the steel support; Step 3: Conduct a water pressure test on the connected road heat exchange pipe to check whether there is water leakage and whether the water pressure is normal; Step 4: Pour the cement concrete surface layer to reach the designed elevation. When the cement concrete reaches 25%-30% of the designed strength, use a cutting machine to cut the road transverse joints and road longitudinal joints. After cutting, fill the road transverse joints and road longitudinal joints with joint fillers; then, lay the asphalt lower layer and asphalt upper layer on the cement concrete surface layer in sequence. After laying, compact them to complete the laying of cement concrete asphalt road; Step 5: Drill holes outside the cement concrete asphalt road, bury U-shaped PE pipes to form heat extraction pipes, install the first circulating water pump at the outlet end of the heat extraction pipe, install the first pressure monitor at the inlet end, install the heat exchanger unit and connect it with the heat extraction pipe through pipelines to complete the layout of the heat extraction unit; install the heat collection tank, the main water inlet pipe and the main water outlet pipe, connect the main water inlet pipe with the connecting pipe I, and connect the main water outlet pipe with another connecting pipe I, then use pipelines to connect the heat exchanger unit, the heat collection tank, the temperature sensor, the second circulating water pump, and the main water inlet pipe in sequence, and then use pipelines to connect the main water outlet pipe, the temperature sensor, the second pressure monitor, and the heat exchanger unit in sequence to form a heat and mass circulation system to complete the layout of the heating unit; finally, install the geothermal ice melting system control device to complete the installation of the geothermal ice melting pipeline on the entire tunnel entrance pavement; Step 6: Complete the commissioning and acceptance of the geothermal ice-melting pipeline on the tunnel entrance pavement.

2. The laying method according to claim 1, characterized in that: The water is heated again using a heat collection tank.

3. The laying method according to claim 1, characterized in that: A temperature sensor is installed on the pipeline between the heat collecting tank and the second circulating water pump. Similarly, another temperature sensor is installed on the input pipeline of the second pressure monitor. The temperature sensor transmits data to the temperature monitor to monitor the temperature of the water in the main water inlet pipe and the main water outlet pipe.

4. The laying method according to claim 1, characterized in that: A temperature sensor is installed in the asphalt upper layer of the cement concrete asphalt road to transmit data to a temperature monitor to monitor the temperature of the cement concrete asphalt road surface.

5. The laying method according to claim 1, characterized in that: The main water inlet pipe and the main water outlet pipe are arranged on one side of the cement concrete asphalt road close to the heat extraction unit, and a layer of thermal insulation cotton is wrapped on the outer surface of the main water inlet pipe and the main water outlet pipe.

6. The laying method according to claim 1, characterized in that: Multiple rows of standard heat exchange tube modules are laid on each lane, and each row of standard heat exchange tube modules is composed of two standard heat exchange tube modules connected in series through connecting pipe II. Adjacent standard heat exchange tube modules on different lanes are connected in series by connecting pipe III. Thus, every two rows of standard heat exchange tube modules form a heat and mass circulation pipeline, the water inlet end of the heat and mass circulation pipeline is connected to the main water inlet pipe through connecting pipe I, and the water outlet end is connected to the main water outlet pipe through another connecting pipe I. The two rows of standard heat pipe modules are connected in series through connecting pipe IV.

7. The laying method according to claim 1, characterized in that: The control device is a geothermal ice-melting system control device, and its working process is as follows: when the temperature sensor detects that the surface temperature of the cement concrete asphalt road has dropped to 2°C, the temperature monitor transmits a signal to the geothermal ice-melting system control device, and the geothermal ice-melting system control device starts the first circulating water pump, the second circulating water pump, and the heat exchange unit to ensure the normal operation of the heat extraction unit and the heat supply unit; when encountering extremely cold weather, when the temperature monitor detects that the surface temperature of the cement concrete asphalt road is below 0°C for more than 10 hours, the geothermal ice-melting system control device turns on the heating switch of the water collection tank to perform secondary heating on the water of the heat supply unit; during the operation of the geothermal ice-melting pipeline on the tunnel entrance pavement, the first pressure monitor of the heat extraction unit and the second pressure monitor of the heat supply unit monitor the pressure, and when abnormal water pressure is detected, a signal is transmitted to the geothermal ice-melting system control device, and the geothermal ice-melting system control device immediately closes the geothermal ice-melting pipeline on the entire tunnel entrance pavement.

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