Ice and snow melting system and application method thereof

Abstract

The invention relates to the technical field of pavement, and provides an ice-melting and snow-melting system and an application method thereof, so as to solve the problem that the existing pavement snow-removing and ice-melting system does not have the function of self-limiting temperature protection cable, needs to cooperate with sensors and servers, and has high cost; the invention comprises a pavement heat-conducting groove device laid on a roadbed, the pavement heat-conducting groove device comprises a heat-conducting groove body, the heat-conducting groove body comprises a pair of mirror-symmetrically arranged steel sections and a cover plate, the pair of the steel sections comprises a left steel section and a right steel section, the cover plate connects the left steel section and the right steel section, a noise reduction plate is further arranged at the upper end of the pair of the steel sections, the pair of the steel sections, the cover plate and the noise reduction plate form a receiving groove, a heat-generating belt is installed in the receiving groove, a first elastic filling layer is arranged on the outer side of the bottom of the heat-generating belt, and a second elastic filling layer is arranged on the outer side of the top of the heat-generating belt.

Description

Technical Field

[0001] The present invention relates to the technical field of road surface, and in particular to an ice and snow melting system and an application method thereof. Background Art

[0002] With the impact of global warming, extreme weather events are becoming more frequent, especially in winter, when many regions are facing serious ice and snow disasters. Ice and snow not only bring great inconvenience to people's daily travel, but also pose a serious threat to transportation facilities such as roads and bridges. Although traditional methods of de-icing and snow melting, such as salting and snowplows, can alleviate the impact of ice and snow on traffic to a certain extent, they have disadvantages such as low efficiency, high cost, and great impact on the environment.

[0003] To this end, researchers have been looking for more efficient and environmentally friendly de-icing and snow-melting solutions. Chinese Patent Publication No. CN110468653B discloses a graphene ultra-thin conductive wear layer construction method, the key points of which are construction preparation, power cable installation, sensor burial and installation, control system installation, control system installation in the control box, leveling layer laying, insulation layer paving, graphene heating layer laying, surface wear layer paving, maintenance, maintenance after construction is completed, system debugging and inspection, after the system is fully installed, system debugging, quality inspection and acceptance, and traffic is opened after the effective strength is formed and stabilized, generally 30 hours after paving. This graphene ultra-thin conductive wear layer construction method has the advantages of rapid snow removal and reduced corrosion. However, when the heating temperature of the invention is too high, there is a problem of damaging the powered cables, and the energy consumption is high, and it does not have the characteristics of intelligent energy saving.

[0004] With the continuous advancement of science and technology and the continuous improvement of people's environmental awareness, the electric heating intelligent road deicing and snow melting system will play an increasingly important role in future transportation construction. China Patent Publication No. CN114657838B discloses an intelligent energy-saving snow-melting road surface and manufacturing method of a flexible electronic heating cable, which solves the technical problems of insufficient toughness and large power loss of cables in existing technical methods. The flexible cable is made of special modified multi-walled carbon nanotubes, so that the cable has good bending, elasticity and hydrophobicity; the cable is heated and adjusted in real time by analyzing the data obtained by algorithms such as image fusion, Kalman filtering and visual detection, and the snow on the road is removed with the lowest heating energy consumption. On the one hand, the invention uses special materials to make the flexible cable, which makes the heating cable have stronger load bearing capacity and fatigue load resistance such as wheels, ensuring the durability of the asphalt embedded cable. On the other hand, it can achieve zero snow accumulation on the road through visual detection intelligent detection technology combined with real-time engineering backgrounds such as wheel rolling and lighting under almost zero interference. However, this invention does not have the function of self-limiting temperature to protect the cable during snow melting, and the application of algorithms such as image fusion, Kalman filtering, and visual detection requires the cooperation of servers, which is relatively costly. Summary of the invention

[0005] Therefore, in view of the above problems, the present invention provides an ice and snow melting system to solve the problem that the existing road snow and ice melting system does not have the function of self-limiting temperature protection cable, and needs to cooperate with sensors and servers, which is relatively costly.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A snow and ice melting system, comprising a road surface heat conduction groove device laid on a roadbed, the road surface heat conduction groove device comprising a heat conduction groove body, the heat conduction groove body comprising a cover plate and a pair of mirror-symmetrically arranged steel sections, the pair of steel sections comprising a left steel section and a right steel section, a gap being left between the left steel section and the right steel section, the cover plate connecting the left steel section and the right steel section to form an expansion joint structure, a noise reduction plate being further arranged at the upper ends of the pair of steel sections, the pair of steel sections, the cover plate and the noise reduction plate forming a receiving groove, at least one partition being arranged inside the receiving groove, a heat-generating belt being installed in the receiving groove, a first elastic filling layer being arranged on the outer side of the bottom of the heat-generating belt section, a second elastic filling layer being arranged on the outer side of the top of the heat-generating belt section, a heat-conducting layer being arranged on the second elastic filling layer, a first anchoring device being arranged at the lower end of the left steel section, the first anchoring device comprising a first cushion block and at least one first anchoring screw, a second anchoring device being arranged at the lower end of the right steel section, the second anchoring device comprising a second cushion block and at least one second anchoring screw, the first anchoring screw The first pad and the lower end of the left steel section are penetrated, and the second anchoring screw penetrates the second pad and the lower end of the right steel section; the heat-generating belt includes a metal conductor core, a self-limiting temperature graphene conductive layer, a metal wire mesh shielding layer, an isolation layer, and a sheath layer arranged in sequence from the inside to the outside, and an insulating filling material is arranged between the self-limiting temperature graphene conductive layer and the metal wire mesh shielding layer; the self-limiting temperature graphene conductive layer includes a conductive silver paste layer and a self-limiting temperature graphene layer, the conductive silver paste layer is arranged close to the metal conductor core, and the outer wall of the sheath layer A nano waterproof coating is arranged on it, and the outer layer of the self-limiting temperature graphene conductive layer is coated with a flame retardant layer; the self-limiting temperature graphene conductive layer comprises the following raw materials in parts by weight: 5-10 parts by weight of conductive particles, 70-90 parts by weight of polymer-based PTC self-limiting temperature materials, 10-20 parts by weight of cationic nanocellulose and 20-30 parts by weight of solvents; the first elastic filling layer is formed by mixing floating beads and polyurethane elastic concrete; the second elastic filling layer is formed by mixing high thermal conductivity material and polyurethane elastic concrete.

[0008] Furthermore, the polymer-based PTC self-limiting temperature material includes a skeleton support material and a temperature control material; the weight ratio of the skeleton support material to the temperature control material is 1:2.5-1:4; the skeleton support material is one of ethylene-vinyl acetate, high-density polyethylene and low-density polyethylene, or a mixture of several of them in equal proportions; the temperature control material is any one of acrylic resin, polyethylene oxide, n-tetracosane, lauric acid, polyethylene terephthalate and polyvinylidene.

[0009] Furthermore, the conductive particles are any one of acetylene black, graphite, graphene, carbon nanotubes and carbon fibers; the solvent is petroleum ether or acetone; the weight ratio of the floating beads to the polyurethane elastic concrete is 1:10-1:12; the weight ratio of the high thermal conductivity material to the polyurethane elastic concrete is 1:4-1:7.

[0010] Furthermore, the polyurethane elastic concrete comprises the following raw materials in parts by weight: 5-8 parts by weight of polyurethane elastic material, 10-15 parts by weight of cement, 70-80 parts by weight of mixed aggregate and 10-25 parts by weight of dewatering agent; the general structural formula of the polyurethane elastic material is as shown in Formula (1):

[0011] In the formula: R1 is an ether chain oligomer having at least 2 hydroxyl groups at the terminal group, and R2 is an oligomeric isocyanate having 3-6 isocyanate groups.

[0012] Furthermore, the high thermal conductivity material is any one of graphite, carbon black and carbon fiber, or a mixture of two or more of them in any proportion.

[0013] Furthermore, the metal conductor core is composed of a plurality of copper wires; the raw material of the metal wire mesh shielding layer is copper wire, which is formed by warp and weft plain weaving; the raw material of the isolation layer is ultraviolet light cross-linked polyethylene; and the raw material of the sheath layer is polyurethane.

[0014] Furthermore, the cement is PO 42.5 ordinary Portland cement; the mixed aggregate includes: 5-30 parts by weight of AC-5 sand-type concrete, 5-35 parts by weight of AC-10 and 5-25 parts by weight of AC-13 fine-grained concrete; the particle size of the mixed aggregate is 0.1mm-15mm; the dehydrating agent is 5A molecular sieve activated powder; and the particle size of the dehydrating agent is 2mm-4mm.

[0015] An application method of an ice and snow melting system comprises the following steps:

[0016] S1. Twisting a plurality of copper wires into a metal conductor core by a twisting device, coating the metal conductor core with a prepared self-limiting temperature graphene conductive layer, winding two metal conductor cores coated with the self-limiting temperature graphene conductive layer with refractory mica to form a flame retardant layer, filling with insulating filling material, coating with a metal wire mesh shielding layer, an isolation layer, and a sheath layer, to obtain a heat-generating belt;

[0017] S2. Lay a pavement heat-conducting groove on the roadbed, mix the floating beads and the polyurethane elastic concrete evenly to obtain a first mixture, fill the first mixture to the bottom of the pavement heat-conducting groove to obtain a first elastic filling layer, and immediately install the above-mentioned heat-generating belt into the pavement heat-conducting groove, mix the high thermal conductivity material and the polyurethane elastic concrete evenly to obtain a second mixture, fill the second mixture to the outside of the top of the above-mentioned heat-generating belt to obtain a second elastic filling layer, and install the heat-conducting layer and the noise reduction plate.

[0018] Furthermore, the preparation process of the self-limiting temperature graphene conductive layer is:

[0019] a. Preparation of conductive particle dispersion: Weigh conductive particles and solvent by weight, stir and mix evenly, let stand for 24h-36h, filter, wash with deionized water 3-5 times, perform vacuum distillation and then dry, then add 2-5 parts by weight of polyvinyl pyrrolidone and 2-5 parts by weight of 1-methyl-2-pyrrolidone, stir and mix evenly, perform water bath ultrasound, and obtain conductive particle dispersion;

[0020] b. stirring and mixing the conductive particle dispersion and cationic nanocellulose uniformly, pouring into a Buchner funnel with a polytetrafluoroethylene filter membrane after water bath ultrasonic treatment, filtering, and drying to obtain a solid mixture;

[0021] c. Preparation of polymer-based PTC self-limiting temperature material: weigh the skeleton support material and the temperature control material by weight, add 20-30 parts by weight of xylene solution, heat to 60°C-80°C, stir and mix evenly, perform homogeneous dispersion treatment, and obtain a mixed solution;

[0022] d. Add the solid mixture treated in step b to the mixed solution obtained in step c, continue to stir evenly at 60° C.-80° C., and then perform water bath ultrasonic treatment to obtain a preliminary finished sample;

[0023] e. Put the above-mentioned preliminary finished product of the sample into a mold, press it into a film, and then perform two heat treatments to obtain the self-limiting temperature graphene conductive layer.

[0024] Furthermore, the preparation process of the polyurethane elastic concrete is as follows:

[0025] 1) Dewater the cement and mixed aggregate, seal them, and cool them to room temperature for later use;

[0026] 2) The cement, mixed aggregate and dewatering agent after the primary dewatering treatment are stirred and mixed evenly, and a secondary dewatering treatment is performed to obtain a mixture, which is sealed and stored for standby use;

[0027] 3) The polyurethane elastic material and the mixture obtained in step 2) are fully stirred at 140° C.-160° C., and subjected to high-speed homogenization treatment to obtain the polyurethane elastic concrete.

[0028] By adopting the above technical solution, the beneficial effects of the present invention are:

[0029] The self-limiting temperature graphene conductive layer is prepared by using ethylene-vinyl acetate copolymer with low crystallinity as the skeleton material and lauric acid, an organic acid crystal with low melting point and similar structure to ethylene-vinyl acetate copolymer, as the temperature control material of the Curie temperature point. The Curie temperature of the prepared self-limiting temperature graphene conductive layer is about 60°C. After being heated, it has a low resistance, thereby generating heat and transferring the heat to the road surface. Since the temperature of the road surface is higher than the ambient temperature, ice and snow are melted on the road surface. When the temperature rises above the Curie temperature, the heating power of the self-limiting temperature graphene conductive layer decreases rapidly due to its sharp increase in resistance, thereby stabilizing the controlled temperature near its Curie temperature, thereby realizing the self-limiting temperature function. This temperature control method does not require the installation of an overheating protection device or an additional control system, server, sensor, etc., can reduce the complexity and energy consumption of the temperature control system, and has the advantages of low cost and simplicity.

[0030] The heat-generating belt is a flat structure, which can increase the contact area with the road surface, facilitate heat transfer, and improve ice melting efficiency; the sheath layer can prevent the heat-generating belt from being punctured by the outside, crushed by cars, and from being damaged by water or corrosive liquids during ice melting;

[0031] There is a gap between the left and right steel sections of the road heat conduction groove, and the cover seam plate connects the left and right steel sections, so that the left and right steel sections can be expanded and contracted horizontally along the width direction, thereby forming an expansion joint structure, which can avoid stress and deformation when the heat conduction groove body expands or contracts due to temperature, thereby avoiding damage to the heat conduction groove structure; and the heat conduction groove structure made of steel can directly bear the wheel load, has a certain vertical rigidity, and has the advantages of large span clearance capacity and stable driving; a noise reduction plate is arranged on the upper end of the steel section, and the noise reduction plate can effectively absorb the noise generated when the vehicle passes, thereby reducing the noise and avoiding the impact on the surrounding residents; at the same time, it also has the function of isolating the left and right, preventing stones, gravel, dust and other materials from entering the receiving groove;

[0032] A first elastic filling layer is provided on the outer side of the bottom of the heat-generating belt, and a second elastic filling layer is provided on the outer side of the top of the heat-generating belt. The first elastic filling layer and the second elastic filling layer are a mixture of polyurethane and concrete. The first elastic filling layer and the second elastic filling layer are tightly connected to the inner wall of the receiving groove to form a buffer structure, which can reduce the vibration generated when the vehicle passes by and avoid the damage of the heat-generating belt caused by friction with the inner wall of the receiving groove, thereby effectively protecting the heat-generating belt; at the same time, the strength, crack resistance and compressive resistance of the concrete are improved; a heat-conducting layer is provided on the second elastic filling layer, and the heat-conducting layer is made of a high thermal conductivity metal material, which can quickly transfer the heat generated by the heat-generating belt upward to the road surface, realize ice melting and snow removal, and further improve the heat transfer efficiency between the heat-conducting layer and the road surface. At the same time, the firmness between the heat-conducting layer and the road surface can be increased, so that it can withstand greater pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a structural schematic diagram of an ice and snow melting system in Embodiment 1 of the present invention;

[0034] Figure 2 1 is a schematic structural diagram of the heat-generating belt in Embodiment 1 of the present invention;

[0035] Explanation of the numbers in the figure: 1-heat-conducting groove body, 11-steel, 12-cover seam plate, 111-left steel, 112-right steel, 13-noise reduction plate, 14-accommodating groove, 141-partition, 15-heat-generating belt, 16-first elastic filling layer, 17-second elastic filling layer, 18-heat-conducting layer, 19-first anchoring device, 191-first cushion block, 192-first anchoring screw, 20-second anchoring device, 201-second cushion block, 202-second anchoring screw, 151-metal conductor core, 152-self-limiting temperature graphene conductive layer, 153-metal wire mesh shielding layer, 154-isolation layer, 155-sheath layer, 156-insulating filling material, 1521-conductive silver paste layer, 1522-self-limiting temperature graphene layer, 1551-nano waterproof coating, 157-flame retardant layer. DETAILED DESCRIPTION Example 1

[0036] refer to Figure 1 and Figure 2A snow and ice melting system, comprising a road surface heat conduction trough device laid on a roadbed, the road surface heat conduction trough device comprising a heat conduction trough body 1, the heat conduction trough body 1 comprising a cover plate 12 and a pair of mirror-symmetrically arranged steel sections 11, the pair of steel sections 11 comprising a left steel section 111 and a right steel section 112, the cover plate 12 connecting the left steel section 111 and the right steel section 112, a noise reduction plate 13 is further arranged at the upper end of the pair of steel sections 11, the pair of steel sections 11, the cover plate 12 and the noise reduction plate 13 surround a receiving trough 14, the interior of the receiving trough 14 A partition 141 is provided, a heat-generating belt 15 is installed in the receiving groove 14, a first elastic filling layer 16 is provided on the outer side of the bottom of the heat-generating belt 15, a second elastic filling layer 17 is provided on the outer side of the top of the heat-generating belt 15, a heat-conducting layer 18 is provided on the second elastic filling layer 17, a first anchoring device 19 is provided at the lower end of the left steel section 111, the first anchoring device 19 includes a first cushion block 191 and a first anchoring screw 192, a second anchoring device 20 is provided at the lower end of the right steel section 112, the second anchoring device 20 includes a second cushion block 20 1 and a second anchoring screw 202, the first anchoring screw 192 passes through the first cushion block 191 and the lower end of the left steel 111, and the second anchoring screw 202 passes through the second cushion block 201 and the lower end of the right steel 112; the heat-generating belt 15 includes a metal conductor core 151, a self-limiting temperature graphene conductive layer 152, a metal wire mesh shielding layer 153, an isolation layer 154, and a sheath layer 155 arranged in sequence from the inside to the outside, and an insulating filling material 156 is provided between the self-limiting temperature graphene conductive layer 152 and the metal wire mesh shielding layer 153; the self The temperature-limiting graphene conductive layer 152 includes a conductive silver paste layer 1521 and a self-limiting temperature graphene layer 1522. A nano-waterproof coating 1551 is provided on the outer wall of the sheath layer 155. The outer layer of the self-limiting temperature graphene conductive layer 152 is coated with a flame retardant layer 157. The self-limiting temperature graphene conductive layer is a mixture of acetylene carbon black, polymer-based PTC self-limiting temperature material, cationic nanocellulose and petroleum ether. The first elastic filling layer is a mixture of floating beads and polyurethane elastic concrete. The second elastic filling layer is a mixture of graphite and polyurethane elastic concrete.

[0037] Among them, the polymer-based PTC self-limiting temperature material skeleton support material and temperature control material; the weight ratio of the skeleton support material and the temperature control material is 1:2.5; the skeleton support material is ethylene-vinyl acetate, and the temperature control material is acrylic resin;

[0038] The polyurethane elastic concrete comprises the following raw materials in parts by weight: 5 parts by weight of polyurethane elastic material, 10 parts by weight of cement, 70 parts by weight of mixed aggregate, and 10 parts by weight of dewatering agent; the structural formula of the polyurethane elastic material is as shown in Formula (2):

[0039]

[0040] The metal conductor core is composed of a plurality of copper wires; the metal wire mesh shielding layer is made of copper wire, which is woven in plain warp and weft; the isolation layer is made of ultraviolet cross-linked polyethylene; the sheath layer is made of polyurethane;

[0041] The cement is PO 42.5 ordinary Portland cement; the mixed aggregate includes: 5 parts by weight of AC-5 sand-type concrete, 5 parts by weight of AC-10 and 5 parts by weight of AC-13 fine-grained concrete; the particle size of the mixed aggregate is 0.1 mm; the dehydrating agent is 5A molecular sieve activated powder; the particle size of the dehydrating agent is 2 mm;

[0042] The application method of the above-mentioned ice and snow melting system comprises the following steps:

[0043] Preparation of polyurethane elastic concrete

[0044] 1) Dewater the cement and mixed aggregate, seal them, and cool them to room temperature for later use;

[0045] 2) The cement, mixed aggregate and dewatering agent after the primary dewatering treatment are stirred and mixed evenly, and a secondary dewatering treatment is performed to obtain a mixture, which is sealed and stored for standby use;

[0046] 3) fully stirring the polyurethane elastic material and the mixture obtained in step 2) at 140° C., and performing high-speed homogenization to obtain the polyurethane elastic concrete;

[0047] Preparation of self-limiting temperature graphene conductive layer

[0048] a. Preparation of conductive particle dispersion: Weigh conductive particles and solvent by weight, stir and mix evenly, let stand for 24 hours, filter, wash with deionized water 3 times, perform vacuum distillation and then dry, then add 2 parts by weight of polyvinyl pyrrolidone and 2 parts by weight of 1-methyl-2-pyrrolidone, stir and mix evenly, perform water bath ultrasound to obtain a conductive particle dispersion;

[0049] b. stirring and mixing the conductive particle dispersion and cationic nanocellulose uniformly, pouring into a Buchner funnel with a polytetrafluoroethylene filter membrane after water bath ultrasonic treatment, filtering, and drying to obtain a solid mixture;

[0050] c. Preparation of polymer-based PTC self-limiting temperature material: Weigh the skeleton support material and the temperature control material by weight, add 20 parts by weight of xylene solution, heat to 60°C, stir and mix evenly, perform homogeneous dispersion treatment, and obtain a mixed solution;

[0051] d. Add the solid mixture treated in step b to the mixed solution obtained in step c, continue to stir evenly at 60° C., and then perform water bath ultrasonic treatment to obtain a preliminary finished sample;

[0052] e. placing the above-mentioned sample pre-finished product into a mold, pressing it into a film and then performing two heat treatments to obtain the self-limiting temperature graphene conductive layer;

[0053] (3) twisting a plurality of copper wires into a metal conductor core by a twisting device, coating the metal conductor core with a prepared self-limiting temperature graphene conductive layer, winding two metal conductor cores coated with the self-limiting temperature graphene conductive layer with refractory mica to form a flame retardant layer, filling with insulating filling material, coating with a metal wire mesh shielding layer, an isolation layer, and a sheath layer, and obtaining a heat-generating belt;

[0054] (4) Laying a pavement heat-conducting groove on the roadbed, mixing the floating beads and the polyurethane elastic concrete evenly to obtain a first mixture, filling the first mixture to the bottom of the pavement heat-conducting groove to obtain a first elastic filling layer, and immediately installing the above-mentioned heat-generating belt into the pavement heat-conducting groove, mixing the high thermal conductivity material and the polyurethane elastic concrete evenly to obtain a second mixture, filling the second mixture to the outside of the top of the above-mentioned heat-generating belt to obtain a second elastic filling layer, and installing the heat-conducting layer and the noise reduction plate. Example 2

[0055] A snow and ice melting system, comprising a road surface heat conduction trough device laid on a roadbed, the road surface heat conduction trough device comprising a heat conduction trough body, the heat conduction trough body comprising a pair of mirror-symmetrically arranged steel sections and a cover plate, the pair of steel sections comprising a left steel section and a right steel section, the cover plate connecting the left steel section and the right steel section, a noise reduction plate being further arranged at the upper ends of the pair of steel sections, the pair of steel sections, the cover plate and the noise reduction plate forming a receiving trough, a partition being arranged inside the receiving trough, a heat-generating belt being installed in the receiving trough, a first elastic filling layer being arranged on the outer side of the bottom of the heat-generating belt, a second elastic filling layer being arranged on the outer side of the top of the heat-generating belt, a heat-conducting layer being arranged on the second elastic filling layer, a first anchoring device being arranged at the lower end of the left steel section, the first anchoring device comprising a first cushion block and a first anchoring screw, a second anchoring device being arranged at the lower end of the right steel section, the second anchoring device comprising a second cushion block and a The second anchor screw, the first anchor screw passes through the first pad and the lower end of the left steel section, and the second anchor screw passes through the second pad and the lower end of the right steel section; the heat-generating belt includes a metal conductor core, a self-limiting temperature graphene conductive layer, a metal wire mesh shielding layer, an isolation layer, and a sheath layer arranged in sequence from the inside to the outside, and an insulating filling material is provided between the self-limiting temperature graphene conductive layer and the metal wire mesh shielding layer; the self-limiting temperature graphene conductive layer includes a conductive silver paste layer and a self-limiting temperature graphene layer, a nano waterproof coating is provided on the outer wall of the sheath layer, and the outer layer of the self-limiting temperature graphene conductive layer is coated with a flame retardant layer; the self-limiting temperature graphene conductive layer is a mixture of acetylene carbon black, polymer-based PTC self-limiting temperature material, cationic nanocellulose and petroleum ether; the first elastic filling layer is a mixture of floating beads and polyurethane elastic concrete; the second elastic filling layer is a mixture of graphite and polyurethane elastic concrete;

[0056] Among them, the polymer-based PTC self-limiting temperature material skeleton support material and temperature control material; the weight ratio of the skeleton support material and the temperature control material is 1:3; the skeleton support material is high-density polyethylene, and the temperature control material is polyethylene oxide;

[0057] The polyurethane elastic concrete comprises the following raw materials in parts by weight: 6 parts by weight of polyurethane elastic material, 12 parts by weight of cement, 75 parts by weight of mixed aggregate, and 20 parts by weight of dewatering agent; the molecular structure of the polyurethane elastic material is shown in formula (3):

[0058]

[0059] The metal conductor core is composed of a plurality of copper wires; the metal wire mesh shielding layer is made of copper wire, which is woven in plain warp and weft; the isolation layer is made of ultraviolet cross-linked polyethylene; the sheath layer is made of polyurethane;

[0060] The cement is PO 42.5 ordinary Portland cement; the mixed aggregate includes: 15 parts by weight of AC-5 sand-type concrete, 15 parts by weight of AC-10 and 15 parts by weight of AC-13 fine-grained concrete; the particle size of the mixed aggregate is 10 mm; the dehydrating agent is 5A molecular sieve activated powder; the particle size of the dehydrating agent is 3 mm;

[0061] The application method of the above-mentioned ice and snow melting system comprises the following steps:

[0062] Preparation of polyurethane elastic concrete

[0063] 1) Dewater the cement and mixed aggregate, seal them, and cool them to room temperature for later use;

[0064] 2) The cement, mixed aggregate and dewatering agent after the primary dewatering treatment are stirred and mixed evenly, and a secondary dewatering treatment is performed to obtain a mixture, which is sealed and stored for standby use;

[0065] 3) fully stirring the polyurethane elastic material and the mixture obtained in step 2) at 150° C., and performing high-speed homogenization to obtain the polyurethane elastic concrete;

[0066] Preparation of self-limiting temperature graphene conductive layer

[0067] a. Preparation of conductive particle dispersion: Weigh conductive particles and solvent by weight, stir and mix evenly, let stand for 36 hours, filter, wash with deionized water 3 times, perform vacuum distillation and then dry, then add 2 parts by weight of polyvinyl pyrrolidone and 2 parts by weight of 1-methyl-2-pyrrolidone, stir and mix evenly, perform water bath ultrasound, and obtain a conductive particle dispersion;

[0068] b. stirring and mixing the conductive particle dispersion and cationic nanocellulose uniformly, pouring into a Buchner funnel with a polytetrafluoroethylene filter membrane after water bath ultrasonic treatment, filtering, and drying to obtain a solid mixture;

[0069] c. Preparation of polymer-based PTC self-limiting temperature material: Weigh the skeleton support material and the temperature control material by weight, add 25 parts by weight of xylene solution, heat to 70°C, stir and mix evenly, perform homogeneous dispersion treatment, and obtain a mixed solution;

[0070] d. Add the solid mixture treated in step b to the mixed solution obtained in step c, continue to stir evenly at 70° C., and then perform water bath ultrasonic treatment to obtain a preliminary finished product of the sample;

[0071] e. placing the above-mentioned sample pre-finished product into a mold, pressing it into a film and then performing two heat treatments to obtain the self-limiting temperature graphene conductive layer;

[0072] (3) twisting a plurality of copper wires into a metal conductor core by a twisting device, coating the metal conductor core with a prepared self-limiting temperature graphene conductive layer, winding two metal conductor cores coated with the self-limiting temperature graphene conductive layer with refractory mica to form a flame retardant layer, filling with insulating filling material, coating with a metal wire mesh shielding layer, an isolation layer, and a sheath layer, and obtaining a heat-generating belt;

[0073] (4) Laying a pavement heat-conducting groove on the roadbed, mixing the floating beads and the polyurethane elastic concrete evenly to obtain a first mixture, filling the first mixture to the bottom of the pavement heat-conducting groove to obtain a first elastic filling layer, and immediately installing the above-mentioned heat-generating belt into the pavement heat-conducting groove, mixing the high thermal conductivity material and the polyurethane elastic concrete evenly to obtain a second mixture, filling the second mixture to the outside of the top of the above-mentioned heat-generating belt to obtain a second elastic filling layer, and installing the heat-conducting layer and the noise reduction plate. Example 3

[0074] A snow and ice melting system, comprising a road surface heat conduction trough device laid on a roadbed, the road surface heat conduction trough device comprising a heat conduction trough body, the heat conduction trough body comprising a pair of mirror-symmetrically arranged steel sections and a cover plate, the pair of steel sections comprising a left steel section and a right steel section, the cover plate connecting the left steel section and the right steel section, a noise reduction plate being further arranged at the upper ends of the pair of steel sections, the pair of steel sections, the cover plate and the noise reduction plate forming a receiving trough, a partition being arranged inside the receiving trough, a heat-generating belt being installed in the receiving trough, a first elastic filling layer being arranged on the outer side of the bottom of the heat-generating belt, a second elastic filling layer being arranged on the outer side of the top of the heat-generating belt, a heat-conducting layer being arranged on the second elastic filling layer, a first anchoring device being arranged at the lower end of the left steel section, the first anchoring device comprising a first cushion block and a first anchoring screw, a second anchoring device being arranged at the lower end of the right steel section, the second anchoring device comprising a second cushion block and a The second anchor screw, the first anchor screw passes through the first pad and the lower end of the left steel section, and the second anchor screw passes through the second pad and the lower end of the right steel section; the heat-generating belt includes a metal conductor core, a self-limiting temperature graphene conductive layer, a metal wire mesh shielding layer, an isolation layer, and a sheath layer arranged in sequence from the inside to the outside, and an insulating filling material is provided between the self-limiting temperature graphene conductive layer and the metal wire mesh shielding layer; the self-limiting temperature graphene conductive layer includes a conductive silver paste layer and a self-limiting temperature graphene layer, a nano waterproof coating is provided on the outer wall of the sheath layer, and the outer layer of the self-limiting temperature graphene conductive layer is coated with a flame retardant layer; the self-limiting temperature graphene conductive layer is a mixture of acetylene carbon black, polymer-based PTC self-limiting temperature material, cationic nanocellulose and petroleum ether; the first elastic filling layer is a mixture of floating beads and polyurethane elastic concrete; the second elastic filling layer is a mixture of graphite and polyurethane elastic concrete;

[0075] Among them, the polymer-based PTC self-limiting temperature material skeleton support material and temperature control material; the weight ratio of the skeleton support material and the temperature control material is 1:4; the skeleton support material is low-density polyethylene, and the temperature control material is n-tetracosane;

[0076] The polyurethane elastic concrete comprises the following raw materials in parts by weight: 8 parts by weight of polyurethane elastic material, 15 parts by weight of cement, 80 parts by weight of mixed aggregate, and 25 parts by weight of dewatering agent; the molecular structure of the polyurethane elastic material is shown in formula (4):

[0077]

[0078] The metal conductor core is composed of a plurality of copper wires; the metal wire mesh shielding layer is made of copper wire, which is woven in plain warp and weft; the isolation layer is made of ultraviolet cross-linked polyethylene; the sheath layer is made of polyurethane;

[0079] The cement is PO 42.5 ordinary Portland cement; the mixed aggregate includes: 30 parts by weight of AC-5 sand-type concrete, 35 parts by weight of AC-10 and 25 parts by weight of AC-13 fine-grained concrete; the particle size of the mixed aggregate is 15 mm; the dehydrating agent is 5A molecular sieve activated powder; the particle size of the dehydrating agent is 4 mm;

[0080] The application method of the above-mentioned ice and snow melting system comprises the following steps:

[0081] Preparation of polyurethane elastic concrete

[0082] 1) Dewater the cement and mixed aggregate, seal them, and cool them to room temperature for later use;

[0083] 2) The cement, mixed aggregate and dewatering agent after the primary dewatering treatment are stirred and mixed evenly, and a secondary dewatering treatment is performed to obtain a mixture, which is sealed and stored for standby use;

[0084] 3) fully stirring the polyurethane elastic material and the mixture obtained in step 2) at 160° C., and performing high-speed homogenization treatment to obtain the polyurethane elastic concrete;

[0085] Preparation of self-limiting temperature graphene conductive layer

[0086] a. Preparation of conductive particle dispersion: Weigh conductive particles and solvent by weight, stir and mix evenly, let stand for 36 hours, filter, wash with deionized water 5 times, perform vacuum distillation and then dry, then add 5 parts by weight of polyvinyl pyrrolidone and 5 parts by weight of 1-methyl-2-pyrrolidone, stir and mix evenly, perform water bath ultrasound, and obtain a conductive particle dispersion;

[0087] b. stirring and mixing the conductive particle dispersion and cationic nanocellulose uniformly, pouring into a Buchner funnel with a polytetrafluoroethylene filter membrane after water bath ultrasonic treatment, filtering, and drying to obtain a solid mixture;

[0088] c. Preparation of polymer-based PTC self-limiting temperature material: Weigh the skeleton support material and the temperature control material by weight, add 30 parts by weight of xylene solution, heat to 80°C, stir and mix evenly, perform homogeneous dispersion treatment, and obtain a mixed solution;

[0089] d. Add the solid mixture treated in step b to the mixed solution obtained in step c, continue to stir evenly at 80° C., and then perform water bath ultrasonic treatment to obtain a preliminary finished product of the sample;

[0090] e. placing the above-mentioned sample pre-finished product into a mold, pressing it into a film and then performing two heat treatments to obtain the self-limiting temperature graphene conductive layer;

[0091] (3) twisting a plurality of copper wires into a metal conductor core by a twisting device, coating the metal conductor core with a prepared self-limiting temperature graphene conductive layer, winding two metal conductor cores coated with the self-limiting temperature graphene conductive layer with refractory mica to form a flame retardant layer, filling with insulating filling material, coating with a metal wire mesh shielding layer, an isolation layer, and a sheath layer, and obtaining a heat-generating belt;

[0092] (4) Laying a pavement heat-conducting groove on the roadbed, mixing the floating beads and the polyurethane elastic concrete evenly to obtain a first mixture, filling the first mixture to the bottom of the pavement heat-conducting groove to obtain a first elastic filling layer, and immediately installing the above-mentioned heat-generating belt into the pavement heat-conducting groove, mixing the high thermal conductivity material and the polyurethane elastic concrete evenly to obtain a second mixture, filling the second mixture to the outside of the top of the above-mentioned heat-generating belt to obtain a second elastic filling layer, and installing the heat-conducting layer and the noise reduction plate.

[0093] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An ice and snow melting system, characterized in that: The invention comprises a road surface heat conduction groove device laid on a roadbed, wherein the road surface heat conduction groove device comprises a heat conduction groove body, the heat conduction groove body comprises a cover seam plate and a pair of mirror-symmetrically arranged steel sections, the pair of steel sections comprises a left steel section and a right steel section, a gap is left between the left steel section and the right steel section, the cover seam plate connects the left steel section and the right steel section to form an expansion joint structure, a noise reduction plate is also arranged at the upper end of the pair of steel sections, the pair of steel sections, the cover seam plate and the noise reduction plate form a receiving groove, at least one partition plate is arranged inside the receiving groove, a heat-generating belt is installed in the receiving groove, a first elastic filling layer is arranged on the outer side of the bottom of the heat-generating belt, a second elastic filling layer is arranged on the outer side of the top of the heat-generating belt, a heat-conducting layer is arranged on the second elastic filling layer, a first anchoring device is arranged at the lower end of the left steel section, the first anchoring device comprises a first cushion block and at least one first anchoring screw, a second anchoring device is arranged at the lower end of the right steel section, the second anchoring device comprises a second cushion block and at least one second anchoring screw, the first anchoring screw penetrates the first The pad and the lower end of the left steel section, the second anchoring screw passes through the second pad and the lower end of the right steel section; the heat-generating belt includes a metal conductor core, a self-limiting temperature graphene conductive layer, a metal wire mesh shielding layer, an isolation layer, and a sheath layer which are arranged in sequence from the inside to the outside, and an insulating filling material is provided between the self-limiting temperature graphene conductive layer and the metal wire mesh shielding layer; the self-limiting temperature graphene conductive layer includes a conductive silver paste layer and a self-limiting temperature graphene layer, the conductive silver paste layer is arranged close to the metal conductor core, a nano waterproof coating is arranged on the outer wall of the sheath layer, and the outer layer of the self-limiting temperature graphene conductive layer is coated with a flame retardant layer; the self-limiting temperature graphene conductive layer includes the following raw materials in parts by weight: 5-10 parts by weight of conductive particles, 70-90 parts by weight of polymer-based PTC self-limiting temperature material, 10-20 parts by weight of cationic nanocellulose and 20-30 parts by weight of solvent; the first elastic filling layer is formed by mixing floating beads and polyurethane elastic concrete; the second elastic filling layer is formed by mixing high thermal conductivity material and polyurethane elastic concrete.

2. The ice and snow melting system according to claim 1, characterized in that: The polymer-based PTC self-limiting temperature material includes a skeleton support material and a temperature control material; the weight ratio of the skeleton support material to the temperature control material is 1:2.5-1:4; the skeleton support material is one of ethylene-vinyl acetate, high-density polyethylene and low-density polyethylene, or a mixture of several of them in equal proportions; the temperature control material is any one of acrylic resin, polyethylene oxide, n-tetracosane, lauric acid, polyethylene terephthalate and polyvinylidene.

3. The ice and snow melting system according to claim 1, characterized in that: The conductive particles are any one of acetylene black, graphite, graphene, carbon nanotubes and carbon fibers; the solvent is petroleum ether or acetone; the weight ratio of the floating beads to the polyurethane elastic concrete is 1:10-1:12; the weight ratio of the high thermal conductivity material to the polyurethane elastic concrete is 1:4-1:

7.

4. The ice and snow melting system according to claim 1, characterized in that: The polyurethane elastic concrete comprises the following raw materials in parts by weight: 5-8 parts by weight of polyurethane elastic material, 10-15 parts by weight of cement, 70-80 parts by weight of mixed aggregate and 10-25 parts by weight of dewatering agent; the general structural formula of the polyurethane elastic material is as shown in Formula (1): In formula (1), R1 is an ether chain oligomer having at least two hydroxyl groups at the terminal, and R2 is an oligomeric isocyanate having 3 to 6 isocyanate groups.

5. The ice and snow melting system according to claim 1, characterized in that: The high thermal conductivity material is any one of graphite, carbon black and carbon fiber, or a mixture of two or more of them in any proportion.

6. The ice and snow melting system according to claim 1, characterized in that: The metal conductor core is composed of a plurality of copper wires; the metal wire mesh shielding layer is made of copper wires, which are woven in plain warp and weft; the isolation layer is made of ultraviolet cross-linked polyethylene; and the sheath layer is made of polyurethane.

7. The ice and snow melting system according to claim 4, characterized in that: The cement is PO 42.5 ordinary Portland cement; the mixed aggregate includes: 5-30 parts by weight of AC-5 sand-type concrete, 5-35 parts by weight of AC-10 and 5-25 parts by weight of AC-13 fine-grained concrete; the particle size of the mixed aggregate is 0.1mm-15mm; the dehydrating agent is 5A molecular sieve activated powder; and the particle size of the dehydrating agent is 2mm-4mm.

8. An application method of an ice and snow melting system, characterized in that: An ice and snow melting system as claimed in claim 1, comprising the following steps: S1. Twisting a plurality of copper wires into a metal conductor core by a twisting device, coating the metal conductor core with a prepared self-limiting temperature graphene conductive layer, winding two metal conductor cores coated with the self-limiting temperature graphene conductive layer with refractory mica to form a flame retardant layer, filling with insulating filling material, coating with a metal wire mesh shielding layer, an isolation layer, and a sheath layer, to obtain a heat-generating belt; S2, laying a pavement heat-conducting groove on the roadbed, mixing the floating beads and the polyurethane elastic concrete evenly to obtain a first mixture, filling the first mixture to the bottom of the pavement heat-conducting groove to obtain a first elastic filling layer, and immediately installing the above-mentioned heat-generating belt into the pavement heat-conducting groove, mixing the high thermal conductivity material and the polyurethane elastic concrete evenly to obtain a second mixture, filling the second mixture to the outside of the top of the above-mentioned heat-generating belt to obtain a second elastic filling layer, and installing a heat-conducting layer and a noise reduction plate; The preparation process of the self-limiting temperature graphene conductive layer is as follows: a. Preparation of conductive particle dispersion: Weigh conductive particles and solvent by weight, stir and mix evenly, let stand for 24h-36h, filter, wash with deionized water 3-5 times, perform vacuum distillation and then dry, then add 2-5 parts by weight of polyvinyl pyrrolidone and 2-5 parts by weight of 1-methyl-2-pyrrolidone, stir and mix evenly, perform water bath ultrasound, and obtain conductive particle dispersion; b. stirring and mixing the conductive particle dispersion and cationic nanocellulose uniformly, pouring into a Buchner funnel with a polytetrafluoroethylene filter membrane after water bath ultrasonic treatment, filtering, and drying to obtain a solid mixture; c. Preparation of polymer-based PTC self-limiting temperature material: weigh the skeleton support material and the temperature control material by weight, add 20-30 parts by weight of xylene solution, heat to 60°C-80°C, stir and mix evenly, perform homogeneous dispersion treatment, and obtain a mixed solution; d. Add the solid mixture treated in step b to the mixed solution obtained in step c, continue to stir evenly at 60° C.-80° C., and then perform water bath ultrasonic treatment to obtain a preliminary finished sample; e. Put the above-mentioned preliminary finished product of the sample into a mold, press it into a film, and then perform two heat treatments to obtain the self-limiting temperature graphene conductive layer.

9. The application method of the ice and snow melting system according to claim 8, characterized in that: The preparation process of the polyurethane elastic concrete is as follows: 1) Dewater the cement and mixed aggregate, seal them, and cool them to room temperature for later use; 2) The cement, mixed aggregate and dewatering agent after the primary dewatering treatment are stirred and mixed evenly, and a secondary dewatering treatment is performed to obtain a mixture, which is sealed and stored for standby use; 3) The polyurethane elastic material and the mixture obtained in step 2) are fully stirred at 140° C.-160° C., and subjected to high-speed homogenization treatment to obtain the polyurethane elastic concrete.

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