CN110055856A - Seif-citing rate road surface and heating cable mixing road surface ice melting system and its construction method - Google Patents

Abstract

The invention belongs to road deicing or snow melting technical fields, more particularly to a kind of seif-citing rate road surface and heating cable mixing road surface ice melting system and its construction method, seif-citing rate road surface and heating cable mixing road surface ice melting system include asphalt concrete road structure, rubber asphalt concrete layer and electric heating system；Rubber asphalt concrete layer is laid on the upper surface of asphalt concrete road structure；Electric heating system is placed between asphalt concrete road structure and rubber asphalt concrete layer.The present invention provides one kind effective realize, and the seif-citing rate road surface and heating cable mixing road surface ice melting system and its construction method that ice is broken, reduces thawing difficulty and thawing efficiency can be improved are coagulated in road surface.

Description

Self-stressed pavement and heating cable hybrid pavement ice melting system and construction method thereof

technical field

The invention belongs to the technical field of road snow melting and ice melting, and in particular relates to a self-stressed road surface and a heating cable mixed road ice melting system and a construction method thereof.

Background technique

Road ice and snow disasters bring heavy losses to many countries around the world every year. The snow and icing on the roads in the cold regions of northern my country and the freezing rain regions of the south is serious every year, causing serious traffic jams and triggering a series of traffic accidents. The direct and indirect economic losses caused by the snow and icing on the roads reach hundreds of millions every year. Yuan. For a long time, countries around the world have attached great importance to the treatment of snow and icing on roads. A large number of relevant experimental studies have been carried out, and a variety of technical methods for treating snow and icing on roads have been explored. To sum up, there are two main types of snow icing methods in road area: 1) the removal method can be divided into manual removal and mechanical removal; 2) the melting method can be divided into chemical method and thermal melting method. At present, the most used methods are manual removal and mechanical removal, but they are costly and cause great damage to the road surface. Snow-melting agent is also the main direction of current research. Now the most used salt is chloride salt, which has high cost and great damage to the road surface. The thermal melting method mainly uses the heat generated by geothermal, electric heat, gas, etc. to melt the snow and ice on the road surface. Important sections of high-grade roads, gas stations in high-speed service areas, airport take-off and landing runways, etc. will use a variety of different methods to melt snow and ice, and the most common is the use of snow melting agents. However, the use of chemical snow-melting agents has increased year by year, and its negative impact on the pavement structure and ecological environment has become increasingly prominent, such as: steel corrosion, pavement and pavement erosion damage, soil compaction, groundwater pollution, vegetation damage, etc. Certainly dangerous. With the continuous development of technology, new snow-melting and ice-melting technologies continue to emerge. Now more researches use the electrothermal conversion method to melt snow and ice. This technology can improve energy efficiency, and is clean and environmentally friendly, suitable for airport roads and highways. Snow melting on the road.

SUMMARY OF THE INVENTION

In order to solve the above technical problems existing in the background art, the present invention provides a self-stressed pavement and heating cable hybrid pavement ice-melting system and a construction method for effectively breaking road ice, reducing melting difficulty and improving melting efficiency.

In order to achieve the above object, the present invention adopts the following technical solutions:

A self-stressed pavement and heating cable mixed pavement ice-melting system, characterized in that: the self-stressing pavement and heating cable hybrid pavement ice-melting system comprises an asphalt concrete road structure, a rubber asphalt concrete layer and an electric heating system; the rubber asphalt concrete The layer is laid on the upper surface of the asphalt concrete road structure; the electric heating system is placed between the asphalt concrete road structure and the rubber asphalt concrete layer.

Preferably, the rubber asphalt concrete layer used in the present invention is made of self-stressed rubber asphalt concrete; the self-stressed rubber asphalt concrete is SMA-16 rubber particle deicing and snow asphalt concrete, and the pavement surface layer mixture includes asphalt Stone, mineral powder, Portland cement and rubber particles; the weight ratio of the asphalt stone, mineral powder, Portland cement and rubber particles is (84.5-85.5): (7.5-8.5): (2.5-3.5): (3.5-4.5); the mineral powder is CaO, SiO ₂ , Al ₂ O ₃ and/or Fe ₂ O ₃ ; the Portland cement is P·I42.5, P·I52.5 or P ·I62.5.

Preferably, the asphalt aggregate used in the present invention is a mixture of asphalt and aggregate; the oil-to-stone ratio of the asphalt aggregate is 6.5%; the asphalt is modified high-viscosity asphalt mixed with TPS; the weight ratio of the TPS to the base asphalt is 12:88; the model of the base asphalt is AH-90; a TOR linker is added to the base asphalt; the amount of the TOR linker is 0.14% of the weight of the base asphalt.

Preferably, the pavement surface layer mixture used in the present invention includes stone A with a particle size of 11-19 mm, stone B with a particle size of 6-11 mm, stone C with a particle size of not more than 3 mm, and a particle size of 0.075 mm. Mineral powder, Portland cement and 30-60 mesh rubber particles of ~0.6mm; the weight ratio of the stone A, stone B, stone C, mineral powder, Portland cement and rubber particles is 39:38:8 :8:3:4.

Preferably, the electric heating system used in the present invention includes an intelligent monitoring device, a temperature sensor, an early warning device, an electric valve, an electric heating wire, a silica-coated carbon fiber heating wire, and a mains access terminal; the electric heating wire is placed between the asphalt concrete road structure and the Between self-stressed rubber asphalt pavement; the electric heating wire is U-shaped, and there are multiple U-shaped electric heating wires; multiple U-shaped electric heating wires are connected in parallel; the intelligent monitoring device, temperature sensor, early warning device, electric valve and electric heating wire A closed loop is formed; the electric valve is connected to the mains access terminal; the temperature sensor is a multi-channel temperature acquisition instrument; the temperature sensor is preferably Applent AT4508; the early warning device uses JCJ-1600 icing Monitor sensors online.

Preferably, the electric heating system used in the present invention further comprises a mesh-shaped wire mesh; the U-shaped electric heating wire is bound on the mesh-shaped wire mesh and placed together with the mesh-shaped wire mesh in the asphalt concrete road structure and the self-stressed rubber asphalt Between the road surfaces; the grid-shaped steel mesh adopts argon arc welded steel mesh with Φ2.0-3.5mm and meshes of 100mm×100mm.

Preferably, the asphalt concrete road structure used in the present invention includes an asphalt concrete layer, a heat insulation layer, a road base layer and a road cushion layer sequentially arranged on the upper surface of the road soil base layer from top to bottom; the electric heating system is placed on the asphalt concrete layer. between the rubberized asphalt concrete layer.

Preferably, the thermal conductivity of the heat insulating material used in the heat insulating layer used in the present invention is not greater than 0.041W/m·k, the surface density is not less than 20kg/m ³ , the compressive strength is not less than 100kPa, and the water absorption rate is not greater than 4% (v/v).

Preferably, the heat insulating material used in the heat insulating layer used in the present invention is a polystyrene foam board; the thickness of the heat insulating layer is not greater than 20 mm.

A construction method of a self-stressed pavement and a heating cable hybrid pavement ice-melting system, characterized in that: the construction method of the self-stressing pavement and the heating cable hybrid pavement ice-melting system comprises the following steps:

1) According to the technical specifications for highway asphalt pavement construction and the requirements of the construction process, lay the road cushion and the road base in sequence on the road soil base, and after the road base is laid, lay an insulating layer on the upper surface of the road base; The thermal conductivity of the thermal insulation material used in the layer is not more than 0.041W/m·k, the surface density is not less than 20kg/m ³ , the compressive strength is not less than 100kPa, and the water absorption rate is not more than 4% (v/v); The composite aluminum foil cloth is laid on the upper surface by spunbond non-woven fabric and aluminum film, which is laid flat, fixed and pasted with the thermal insulation layer, and adhered firmly with aluminum foil tape to form a thermal insulation layer;

2) A layer of asphalt concrete is poured on the heat insulation layer, and after the curing is completed, a mesh-shaped steel wire mesh is placed on the asphalt concrete layer. The layout density and line spacing of the mesh-shaped wire mesh are determined according to actual needs, and the heating wire is bound and fixed. On the mesh-shaped steel wire mesh, the mesh-shaped steel mesh is a argon arc welded wire mesh with a mesh size of Φ2.0-3.5 mm and a mesh of 100 mm × 100 mm; continue to pour the asphalt concrete and complete the curing after the asphalt concrete is completely cooled;

3) Pour self-stressed rubber asphalt concrete on the upper surface of the asphalt concrete layer and reach the designed elevation to form a rubberized asphalt concrete layer. After the final maintenance is completed, the entire rubber asphalt concrete road structure that comprehensively utilizes the self-stressed pavement electric heating system is formed; the rubber The asphalt concrete layer is made of self-stressed rubber asphalt concrete; the self-stressed rubber asphalt concrete is SMA-16 rubber particle deicing and snow asphalt concrete, and the pavement surface layer mixture includes asphalt stone, mineral powder, Portland cement and Rubber particles; the weight ratio of the asphalt stone, mineral powder, Portland cement and rubber particles is (84.5-85.5): (7.5-8.5): (2.5-3.5): (3.5-4.5); the mineral powder It is CaO, SiO ₂ , Al ₂ O ₃ and/or Fe ₂ O ₃ ; the Portland cement is of type PI42.5, Pl52.5 or Pl62.5; the particle size of the mineral powder is 0.075mm~ 0.6mm; the rubber particles are 30 mesh to 60 mesh; the asphalt stone is a mixture of asphalt and stone; the oil-to-stone ratio of the asphalt stone is 6.5%; the asphalt is modified high-viscosity asphalt mixed with TPS; the The weight ratio of TPS to base asphalt is 12:88; the model of the base asphalt is AH-90; the base asphalt is added with a TOR linker; the amount of the TOR linker is 0.14% of the weight of the base asphalt;

4) Install an intelligent monitoring device, a temperature sensor, an early warning device and an electric valve outside the rubber asphalt concrete layer; the intelligent monitoring device, the temperature sensor, the early warning device, the electric valve and the electric heating wire form a closed loop; the electric valve is connected to into the mains access terminal.

The advantages of the present invention are:

The invention provides a self-stressed pavement and a heating cable mixed pavement ice melting system and a construction method thereof. The system is composed of a heating cable asphalt concrete structure and a self-stressed rubber asphalt concrete pavement. The asphalt concrete layer of the heating cable adds an insulating layer between the traditional pavement layer and the base layer; the self-stressed asphalt pavement effectively breaks the road ice through its own pre-icing method, reducing the difficulty of melting and improving the melting efficiency. At the same time, the electric heating system uses The external power is transferred to the rubber asphalt concrete layer through the pre-embedded carbon fiber wire, so that the entire pavement system can melt snow and ice. The system can automatically open and close according to the temperature of the rubber asphalt layer, effectively control the heating time, avoid unnecessary waste, and at the same time make full use of the physical properties of rubber asphalt concrete, cleverly combine the self-stressed pavement with the electric heating system to improve the efficiency of melting snow and ice. Reduce energy consumption, more in line with actual needs. Compared with the prior art, the beneficial effect of the present invention lies in that the self-stress generated by the rubber asphalt concrete layer is used to achieve the effect of breaking ice when the amount of snow is less in winter, which can save electric energy, and the rubber is made of discarded rubber through proper processing. Compared with snow melting agent and geothermal energy, it is more environmentally friendly and economical, and has less impact on the environment. When the amount of snow is large, the electric heating is activated at the same time. The combination of the two can effectively reduce the degree of icing and consolidation of the road surface, so that the heating cable can achieve better results and save energy. At the same time, the intelligent monitoring device is used to control the electric valve and heating. Power, the intelligent monitoring device receives the temperature sensor data in real time, and selects the appropriate heating power after processing and analysis, which not only achieves the effect of snow melting and deicing, but also maintains the entire system at the lowest energy consumption, reducing energy waste. The invention adopts the mixed use of self-stressing road surface technology and heating cable technology, which is more suitable for southern regions. When there is no snow or ice or when the ice layer is thin, it can only change the contact state between the road surface and the tire and the deformation characteristics of the road surface. Due to the strong local deformation ability of elastic materials, the self-stress generated by the road surface under the action of external loads can break and melt the frozen road surface, thereby effectively restraining the road surface from freezing. In the case of thick snow and ice, the heating cable can be activated at the same time, and the two work together to achieve the expected effect, which can better save energy and achieve the effect of cleaning and environmental protection.

Description of drawings

1 is a schematic diagram of the heating wire and rubber asphalt concrete embedding of the present invention.

Fig. 2 is an embedded cross-sectional view of the heating wire of the present invention.

Fig. 3 is a middle plan view of the rubber asphalt concrete pavement layer of the present invention.

Labels in the figure:

1- Soil layer; 2- Base layer; 3- Cushion layer; 4- Insulation layer; 5- Asphalt concrete layer; 6- Rubber asphalt concrete layer; 7- Heating wire; 8- Temperature sensor; 9- Early warning device; 10 -Electric valve; 11-Intelligent monitoring device.

Detailed ways

Referring to Figure 1, Figure 2 and Figure 3, the present invention provides a self-stressed road surface and a heating cable mixed road ice melting system. The self-stressed road surface and the heating cable mixed road ice melting system includes an asphalt concrete road structure, a rubber asphalt concrete layer 6 And the electric heating system; the rubber asphalt concrete layer 6 is laid on the upper surface of the asphalt concrete road structure; the electric heating system is placed between the asphalt concrete road structure and the rubber asphalt concrete layer 6 .

The electric heating system is to transfer heat to the rubber asphalt pavement layer 6. The rubber asphalt pavement layer 6 breaks the ice surface through the self-stress generated by the external load, and combines the electric heating energy to better melt the ice and snow, so as to realize the melting and ice melting of the whole system. Purpose. Arranging the heat insulation layer on the road base can avoid the energy loss caused by the downward transfer of the heat generated by the heating cable of the asphalt concrete layer, improve the heating efficiency and reduce the energy consumption. Rubberized asphalt concrete is made by adding an appropriate proportion of fine rubber particles to ordinary asphalt concrete. After the rubber particles are added, on the one hand, the rigidity of the rubber particles and the frozen ice is quite different. Under the action of the vehicle load, stress concentration will be generated around the rubber particles, resulting in On the other hand, due to the different bonding states of rubber particles and aggregates with the frozen ice, the thickness of the frozen ice on the road surface is different, so that the frozen ice is affected by external forces. more easily broken.

The rubberized asphalt concrete layer 6 is made of self-stressed rubberized asphalt concrete; the self-stressed rubberized asphalt concrete is SMA-16 rubber particle deicing and snow-removing asphalt concrete, and the pavement surface layer mixture includes asphalt stone, mineral powder, Portland cement And rubber particles; the weight ratio of asphalt stone, mineral powder, Portland cement and rubber particles is (84.5-85.5): (7.5-8.5): (2.5-3.5): (3.5-4.5); mineral powder is CaO, SiO ₂ , Al ₂ O ₃ and/or Fe ₂ O ₃ ; Portland cement is type P·I42.5, P·I52.5 or P·I62.5. Asphalt aggregate is a mixture of asphalt and stone; the oil-to-stone ratio of asphalt aggregate is 6.5%; asphalt is modified high-viscosity asphalt mixed with TPS; the weight ratio of TPS to base asphalt is 12:88; the type of base asphalt is AH-90; A TOR linker is added to the asphalt; the amount of the TOR linker is 0.14% by weight of the base asphalt. The pavement pavement surface layer mixture includes stone A with a particle size of 11 to 19 mm, stone B with a particle size of 6 to 11 mm, stone C with a particle size of no more than 3 mm, mineral powder with a particle size of 0.075 mm to 0.6 mm, silicon Salt cement and 30 mesh to 60 mesh rubber particles; the weight ratio of stone A, stone B, stone C, mineral powder, Portland cement and rubber particles is 39:38:8:8:3:4. .

The present invention uses rubberized asphalt concrete as the surface layer. Due to the characteristics of small density of rubber particles, deformable, relatively smooth surface, etc., in the process of pavement construction, it is easy to produce agglomeration, non-uniformity, insufficient coating of asphalt, and rolling compaction. The aggregates cannot be fully seated during molding, and a good mixture embedding structure cannot be formed, which reduces the long-term performance of the pavement. Therefore, the use of stirring can make the distribution of rubber and asphalt more uniform, which has a good effect. The best feeding sequence of raw materials: stone and rubber particles→asphalt→mineral powder; the asphalt should be injected after the stone and rubber particles are evenly mixed. Through the order of delivery and long-term stirring, the raw materials such as rubber can be fully mixed evenly, so as to achieve the expected effect. Strong characteristics, through the self-stress generated by the road surface under the action of external load, the road surface ice is broken and melted, thereby effectively inhibiting the road surface icing.

Specifically, the LB3250 asphalt mixing station is used, and the special materials in the mixture are manually fed through the reserved feeding port. The temperature of the matrix asphalt in the modified high-viscosity asphalt mixed with TPS should not be higher than 165 °C; the temperature of the stone material should be higher than 190 °C, and the order of delivery is stone and rubber particles → asphalt → mineral powder; When spraying, the mixing temperature of the mixture should be about 180 °C; when mixing in the mixing building, the mixing time of rubber particles and stone should be 25-30s, and the mixing time after adding asphalt and mineral powder is 60s. The rubber particle asphalt mixture should be rolled by a double-steel-wheel vibratory roller, and the number of final pressing times should be appropriately increased; reducing the rolling speed, increasing the rolling time, and reducing the rebound of the rubber particles will lead to an increase in the porosity. Improve road performance.

The electric heating system includes an intelligent monitoring device 11, a temperature sensor 8, an early warning device 9, an electric valve 10, an electric heating wire 7 and a mains access terminal; the electric heating wire 7 is placed between the asphalt concrete road structure and the self-stressed rubber asphalt pavement; The hot wire 7 is U-shaped, and there are multiple U-shaped electric heating wires 7; a plurality of U-shaped electric heating wires 7 are connected in parallel; the intelligent monitoring device 11, the temperature sensor 8, the early warning device 9, the electric valve 10 and the electric heating wire 7 form a closed loop; The valve 10 is connected to the mains access terminal. The electric heating system also includes a mesh wire mesh; the U-shaped electric heating wire 7 is bound on the mesh wire mesh and is placed between the asphalt concrete road structure and the self-stressed rubber asphalt pavement together with the mesh wire mesh; the mesh wire mesh Use Φ2.0 ~ 3.5mm, mesh 100mm × 100mm argon arc welded wire mesh. The intelligent monitoring device 11 is an existing technology, and its main functions include road temperature monitoring, wind speed monitoring, snow and ice monitoring, early warning analysis, preheating decision-making, estimated ice and snow melting time, automatic opening and closing control of the heating system, etc. The intelligent monitoring system has two modes: There are three modules in each mode, namely information display module, data analysis module and decision execution module.

For the instant ice and snow melting mode, the information display module displays the received road environment parameters on the software interface in real time. In addition, it also needs to display the start time and preheating time of the road snow melting and ice melting heating system obtained by the data analysis module. hot time. The data analysis module is that the system administrator inputs the expected snowfall time t, temperature T and wind speed level M information into the data analysis module according to the weather forecast information, and analyzes the pre-snow and ice-melting heating system on the road before the snowfall through the calculation program. and preheating time to achieve the purpose of the road surface temperature reaching above 0°C before the snow freezes. The decision execution module makes a decision based on the start preheating time and preheating time of the road snow melting and ice melting heating system obtained by the data analysis module. The decision can also be made by the system administrator, and the start time and preheating time of the road snow melting and ice melting system are manually input. time. When the time reaches the start preheating time, the heating system will be automatically activated to start preheating. When the snowfall is over, turn off the heating system manually.

For the lag snow melting mode, the information display module displays the received road environment parameters on the software interface in real time, and also needs to display the ice and snow melting time obtained by the data analysis module. The data analysis module analyzes whether snow is icing according to the road environment information, and calculates the required snow melting time according to the road temperature, wind speed and thickness of ice and snow. The decision execution module is to automatically start the heating system to start heating when the snow and ice on the road is detected, and automatically shut down the heating system to stop heating when the ice and snow melts.

The electric heating system is a functional system that provides heat energy to the rubber asphalt concrete pavement layer through the carbon fiber electric heating wire embedded in the asphalt concrete. The circuit, through the external power supply, converts electric energy into heat energy, provides heat to the rubber asphalt pavement layer 6, intelligent monitoring device 11, temperature sensor 8, early warning device 9, electric valve 10, and electric heating wire 7 are connected to form a closed loop, the electric valve 10 is controlled by the intelligent monitoring device 11. The opening and closing of the electric valve 10 can control the on and off of the electric heating wire current, and can also control the size of the electric heating wire current, thereby controlling the heating efficiency. The electric heating system can be stopped by the electric valve 10. The automatic device is the control component that controls the electric heating system. The temperature sensor 8 is a sensor that measures the surface temperature. The temperature signal is transmitted to the intelligent monitoring device 11, and the temperature signal is received in real time. After comprehensive analysis of the data, the electric valve 10 is directly controlled, the switch of the electric heating system is controlled, and the power of the electric heating system is controlled.

The early warning device selects the JCJ-1600 icing online monitoring sensor to communicate with the GPRS DTU module in the prior art, and sends the data to the wireless DTU through the RS485 serial line, and then the wireless DTU sends the data to the background server in a transparent manner. The background server analyzes the received data to determine whether the road is icy. If it is confirmed that the road is icy, the server sends a heating command. When the data parser receives the heating command from the server, the weak current controller controls the strong current part to turn on the heating switch, so that the It powers the carbon fiber heating wire. When the ice sensor and temperature sensor data indicate that the temperature rises and the ice and snow melt, the server sends a command to stop heating, and the carbon fiber heating wire is disconnected from the power supply.

The asphalt concrete road structure includes an asphalt concrete layer 5, an insulating layer 4, a road base layer 3 and a road cushion layer 2 sequentially arranged on the upper surface of the road soil base 1 from top to bottom; the electric heating system is placed on the asphalt concrete layer 5 and the rubber asphalt concrete. between layers 6. The thermal conductivity of the heat insulating material used in the heat insulating layer 4 is not more than 0.041W/m·k, the surface density is not less than 20kg/m ³ , the compressive strength is not less than 100kPa, and the water absorption rate is not more than 4%v/v. The heat insulating material used in the heat insulating layer 4 is a polystyrene foam board; the thickness of the heat insulating layer 4 is not greater than 20 mm.

At the same time, the present invention also provides a construction method of a self-stressed pavement and a heating cable hybrid pavement ice-melting system. The construction method of the self-stressing pavement and the heating cable hybrid pavement ice-melting system includes the following steps:

1) According to the technical specifications and construction process requirements of highway asphalt pavement construction, lay road cushion 2 and road base 3 on the road soil base 1 in sequence, and after the road base 3 is laid, lay an insulating layer on the upper surface of the road base 3 4. The thermal conductivity of the heat insulating material used in the heat insulating layer 4 is not less than or not greater than 0.041W/m·k, the surface density is not less than 20kg/m ³ , the compressive strength is not less than 100kPa, and the water absorption rate is not greater than 4%v/v; The composite aluminum foil cloth is laid on the upper surface of the thermal insulation layer 4, and the spunbond non-woven fabric is added with an aluminum film.

2) The asphalt concrete layer 5 is poured on the heat insulation layer 4. After the maintenance is completed, a grid-shaped steel wire mesh is placed on the asphalt concrete layer 5. The layout density and line spacing of the grid-shaped wire mesh are determined according to actual needs. Binding and fixing on the mesh-shaped steel wire mesh, the mesh-shaped steel mesh is Φ2.0～3.5mm, mesh 100mm × 100mm argon arc welded wire mesh; Continue to pour the asphalt concrete, wait for the asphalt concrete to cool completely and complete the curing;

3) Pour self-stressed rubber asphalt concrete on the upper surface of the asphalt concrete layer 5 and reach the designed elevation to form a rubberized asphalt concrete layer 6. After the final maintenance is completed, the entire rubber asphalt concrete road structure that comprehensively utilizes the self-stressed pavement electric heating system is formed; Stress rubber asphalt concrete is prepared by mixing stone, mineral powder, cement and rubber particles; the weight ratio of stone, mineral powder, cement and rubber particles is 85:8:3:4;

4) The intelligent monitoring device 11, the temperature sensor 8, the early warning device 9 and the electric valve 10 are installed outside the rubber asphalt concrete layer 6; Closed circuit; electric valve 10 is connected to the mains access terminal.

The working process of the present invention is as follows: when the temperature decreases in winter, after the snow starts to fall, the temperature of the road surface will drop, and a thin layer of ice will be formed on the road surface. It has strong characteristics to break and melt the ice on the road, thereby effectively inhibiting the ice on the road. If the temperature continues to drop, the amount of snow increases, and the ice layer thickens, and the self-stressed road surface is difficult to meet the design requirements, the temperature of the road surface is sensed through the temperature sensor, and the opening and closing of the electric valve and the power of the heating cable are controlled by the intelligent monitoring device. , to generate corresponding heat for different temperatures, which can not only achieve the effect of removing snow and ice, but also save electricity, so as to have a good effect of melting snow and ice.

The applicable conditions of self-stressed pavement and heating cable and how the two work together to achieve the desired effect. The applicable conditions for self-stressed pavement are when the temperature of the pavement is above -4°C and the thickness of the ice layer is less than 3mm. The applicable conditions for the heating cable are when the road surface temperature is lower than -3°C and the thickness of the ice layer is greater than 3mm. The self-stressing heating cable rubber asphalt pavement system can be roughly divided into two stages: the self-stressing single working stage and the combined working stage. The self-stressing single working stage refers to when the temperature is above -4°C and the thickness of the ice layer is less than 3mm. The system only needs to use the self-stress generated by the rubber asphalt pavement under the action of external load to meet the effect of ice breaking and snow melting. In the combined working stage, the road surface temperature is below -3°C, and the thickness of the ice layer is above 3mm. At this time, the self-stress generated by the external load cannot complete the ice-breaking and snow-melting, so the heating cable needs to be turned on. After the heating cable is turned on, the main body for breaking ice and melting snow is the heating cable. At this time, the self-stressed road plays an auxiliary role. The main function is to break the ice surface and make the ice layer more easily melted under the heat emitted by the heating cable, which can save energy to a certain extent. energy consumption. It is expected to save about 30% of energy consumption. At the same time, the temperature sensor and intelligent monitoring device in the intelligent control system can determine the power size according to different temperatures and actual environments, so as to achieve the effect of melting snow and ice efficiently and saving energy.

The technical scheme of the ice-melting system and construction method for rubber asphalt concrete pavement comprehensively utilizing self-stress electric heating provided by the present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become more apparent from the following description.

Example 1:

A construction method of a self-stressed pavement and a heating cable mixed pavement ice melting system, the specific steps of which are as follows:

1) According to the technical specifications and construction process requirements of highway asphalt pavement construction, lay road cushion 2 and road base 3 on the road soil base 1 in turn. Good flammability, sufficient bearing capacity, small dimensional change, thermal conductivity not greater than 0.041W/m·k, surface density not less than 20kg/m ³ , compressive strength not less than 100kPa, water absorption not greater than 4% (v/v) . According to this, the polystyrene foam board is selected, and its performance should meet the requirements of grade III in GB/T11835-1998, and the thickness should be about 20mm to form a thermal insulation layer, and lay a composite aluminum foil on it. The Bugadu aluminum film is laid flat, fixed and pasted with the thermal insulation layer, and adhered firmly with aluminum foil tape to form the thermal insulation layer 4.

2) On the insulation layer, lay asphalt concrete with a thickness of 45mm, and use dense-graded coarse-grained asphalt concrete (AC-25C), and the curing is completed. A grid-shaped steel mesh is placed on it. The steel mesh is usually Φ2.0~3.5mm, and the mesh is 100mm×100mm argon arc welded steel mesh. The steel mesh is connected with a tie, and the heating cable 7 is bound and fixed on the steel mesh. The distance between fixed points is generally 0.5m~0.7m for straight sections, and 0.2m~0.3m for curved sections, so that the heating cables are distributed in a "U shape", carbon fiber heating cables are selected, and asphalt concrete with a certain thickness is poured. Cooling maintenance.

3) Continue to pour a certain thickness of rubber asphalt concrete 6 to meet the design elevation requirements, complete the final maintenance, and complete the entire rubber asphalt concrete road structure equipped with a comprehensive utilization of self-stressed pavement electric heating system.

4) Install the intelligent monitoring device 11, the temperature sensor 8, and the electric valve 10 outside the road structure, and connect the electric heating wire 7 to form a closed loop.

5) Complete the commissioning and acceptance of the entire rubber asphalt concrete pavement ice melting system comprehensively utilizing self-stress electric heating.

In addition, the calculation method of the ice crushing efficiency of rubber asphalt concrete and the control index of heating efficiency of the present invention, the specific realization process is:

1. Calculate the damage rate of road ice

Among them, the ice damage rate is calculated according to formula (1):

λ is the effective ice breakage rate, %;

Ap is the area of cracks or cracks, mm ² ;

μ is the relationship coefficient of crack converted into area, it is recommended to take 0.2 to 0.3;

L is the total length of the crack, mm;

A is the effective area of ice layer, mm ² .

2. Calculate the thermal conductivity of the heating wire

where k——thermal conductivity (W/(m×℃));

I——Hot wire heating current (A);

U——the voltage between the hot wires (V);

L——the length of the hot wire at the voltage outlet (m);

R——The resistance (Ω) between the hot wires A and B at the measured temperature;

t1 and t2 - the time (s) from the time of heating to the moment of measurement;

θ1 and θ2—the temperature rise (°C) of the hot wire at time t1 and t2.

3. Calculate the heating wire power

The heating temperature and electric energy P of each 1m carbon fiber heating wire,

P—— Indicates the power of the carbon fiber heating wire, unit: W

Q ₂ —— Indicates the electric energy of the heating wire per 1m, unit: J

T ₀ —— Indicates the heating time of the heating wire, unit: s

N ^—— represents the length of the embedded heating wire in a road with an area of 1m2. Unit: m

It should be noted that the accompanying drawings of the present invention are all in a very simplified form and use inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention, and are not intended to limit the conditions for the implementation of the present invention. . It should also be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any form. Any changes or modifications made by any person of ordinary skill in the field according to the above disclosed technical content should be regarded as equivalent effective embodiments, and all belong to the protection scope of the technical solutions of the present invention.

Claims (10)

1. A self-stressed road surface and a heating cable mixed road ice melting system, characterized in that: the self-stressed road surface and the heating cable mixed road ice melting system comprises an asphalt concrete road structure, a rubber asphalt concrete layer (6) and an electric heating system; The rubber asphalt concrete layer (6) is laid on the upper surface of the asphalt concrete road structure; the electric heating system is placed between the asphalt concrete road structure and the rubber asphalt concrete layer (6). 2. The self-stressed pavement and heating cable mixed pavement ice melting system according to claim 1, characterized in that: the rubberized asphalt concrete layer (6) is made of self-stressed rubberized asphalt concrete; the self-stressed rubber The asphalt concrete is SMA-16 rubber particle deicing and snow asphalt concrete, and the pavement surface layer mixture includes asphalt stone, mineral powder, Portland cement and rubber particles; the asphalt stone, mineral powder, Portland cement and rubber particles The weight ratio is (84.5~85.5): (7.5~8.5): (2.5~3.5): (3.5~4.5); the mineral powder is CaO, SiO ₂ , Al ₂ O ₃ and/or Fe ₂ O ₃ ; The Portland cement has a model of P·I42.5, P·I52.5 or P·I62.5. 3. The self-stressed pavement and heating cable mixed pavement ice melting system according to claim 2, characterized in that: the asphalt stone material is a mixture of asphalt and stone material; the whetstone ratio of the asphalt stone material is 6.5%; the The asphalt is modified high-viscosity asphalt mixed with TPS; the weight ratio of the TPS to the base asphalt is 12:88; the type of the base asphalt is AH-90; the base asphalt is added with a TOR linker; the TOR The amount of the linking agent was 0.14% by weight of the base asphalt. 4. The self-stressed pavement and heating cable hybrid pavement ice-melting system according to claim 2 or 3, wherein the pavement pavement surface layer mixture comprises stone material A with particle size of 11-19 mm, particle size It is stone B with a particle size of 6 to 11 mm, stone C with a particle size of no more than 3 mm, mineral powder with a particle size of 0.075 mm to 0.6 mm, Portland cement and rubber particles of 30 mesh to 60 mesh. 5. The self-stressed pavement and heating cable hybrid pavement ice melting system according to claim 4, characterized in that: the electric heating system comprises an intelligent monitoring device (11), a temperature sensor (8), an early warning device (9), An electric valve (10), an electric heating wire (7) with a silica gel sheath and a carbon fiber heating wire, and a mains access terminal; the electric heating wire (7) is placed between the asphalt concrete road structure and the self-stressed rubber asphalt pavement; the electric heating wire ( 7) U-shaped, with multiple U-shaped heating wires (7); multiple U-shaped heating wires (7) are connected in parallel; the intelligent monitoring device (11), temperature sensor (8), early warning device (9), The electric valve (10) and the electric heating wire (7) form a closed loop; the electric valve (10) is connected to the mains access terminal; the temperature sensor (8) is a multi-channel temperature acquisition instrument; the temperature sensor (8) It is preferably Applent AT4508; the early warning device adopts JCJ-1600 icing online monitoring sensor. 6. The self-stressed pavement and heating cable hybrid pavement ice melting system according to claim 5, characterized in that: the electric heating system further comprises a mesh-shaped steel mesh; the U-shaped electric heating wire (7) is bound on the mesh The mesh wire mesh is placed between the asphalt concrete road structure and the self-stressed rubber asphalt pavement together with the grid wire mesh; the mesh wire mesh adopts argon arc welded steel wire with a mesh size of Φ2.0~3.5mm and a mesh of 100mm×100mm. network. 7. The self-stressed pavement and heating cable mixed pavement ice melting system according to claim 6, characterized in that: the asphalt concrete road structure comprises asphalt concrete sequentially arranged on the upper surface of the road soil base (1) from top to bottom layer (5), heat insulation layer (4), road base layer (3) and road cushion layer (2); the electric heating system is placed between the asphalt concrete layer (5) and the rubberized asphalt concrete layer (6). 8. The self-stressed pavement and heating cable hybrid pavement ice melting system according to claim 7, characterized in that: the thermal conductivity of the thermal insulation material used in the thermal insulation layer (4) is not greater than 0.041W/m·k , the surface density is not less than 20kg/m ³ , the compressive strength is not less than 100kPa, and the water absorption rate is not more than 4% (v/v). 9 . The self-stressed pavement and heating cable hybrid pavement ice melting system according to claim 8 , characterized in that: the thermal insulation material used in the thermal insulation layer ( 4 ) is a polystyrene foam board; The thickness of the layer (4) is not more than 20mm. 10. A construction method of a self-stressed pavement and a heating cable hybrid pavement ice-melting system, characterized in that: the construction method of the self-stressing pavement and a heating cable hybrid pavement ice-melting system comprises the following steps: 1) According to the technical specifications and construction process requirements of highway asphalt pavement construction, lay the road cushion (2) and the road base (3) on the road soil base (1) in turn. The upper surface of (3) is laid with an insulating layer (4); the thermal conductivity of the insulating material used in the insulating layer (4) is not greater than 0.041W/m·k, the surface density is not less than 20kg/m ³ , and the compressive strength Not less than 100kPa, the water absorption rate is not more than 4% (v/v); on the upper surface of the thermal insulation layer (4), the composite aluminum foil cloth is laid with a spunbond non-woven fabric and aluminum film, laid flat, and the thermal insulation layer ( 4) Fixed and pasted, using aluminum foil tape to stick and firm to form a thermal insulation layer; 2) The asphalt concrete layer (5) is poured on the thermal insulation layer (4), and after the curing is completed, a grid-like wire mesh is placed on the asphalt concrete layer (5). The actual demand is determined, and the heating wire (7) is bound and fixed on the grid-shaped steel wire mesh. The mesh-shaped steel wire mesh is a argon arc welded wire mesh with a mesh size of Φ2.0-3.5 mm and a mesh of 100 mm × 100 mm; continue to pour the asphalt concrete, Wait until the asphalt concrete is completely cooled to complete the curing; 3) Pour self-stressed rubber asphalt concrete on the upper surface of the asphalt concrete layer (5) and reach the designed elevation to form a rubberized asphalt concrete layer (6). Road structure; the rubberized asphalt concrete layer (6) is made of self-stressed rubberized asphalt concrete; the self-stressed rubberized asphalt concrete is SMA-16 rubber particle deicing and snow asphalt concrete, and the pavement surface layer mixture includes asphalt stone , mineral powder, Portland cement and rubber particles; the weight ratio of the asphalt stone, mineral powder, Portland cement and rubber particles is (84.5~85.5): (7.5~8.5): (2.5~3.5): ( 3.5~4.5); the mineral powder is CaO, SiO ₂ , Al ₂ O ₃ and/or Fe ₂ O ₃ ; the Portland cement is PI42.5, Pl52.5 or Pl62.5; the The particle size of the mineral powder is 0.075mm~0.6mm; the rubber particles are 30 meshes~60 meshes; the asphalt stone is a mixture of asphalt and stone; the oil-to-stone ratio of the asphalt stone is 6.5%; the asphalt is Modified high-viscosity asphalt mixed with TPS; the weight ratio of the TPS to the base asphalt is 12:88; the model of the base asphalt is AH-90; the base asphalt is added with a TOR linker; the TOR linker The dosage is 0.14% of the base asphalt weight; 4) Install an intelligent monitoring device (11), a temperature sensor (8), an early warning device (9) and an electric valve (10) outside the rubber asphalt concrete layer (6); the intelligent monitoring device (11), the temperature sensor (8), the early warning device (9), the electric valve (10) and the electric heating wire (7) form a closed loop; the electric valve (10) is connected to the mains access terminal.