KR101378133B1 - Heating structure for road and construction method of the same - Google Patents

Abstract

Provided are a heating structure for a road for preventing a road from being frozen in the winter and a construction method for the same. The construction method for the heating structure for a road includes a step of forming an auxiliary basic floor including either mortar or concrete; a step of installing a current applying device on the upper part of the auxiliary basic floor; a step of forming a center heating layer after a heating cement complex composite containing a carbon composite or a carbon mixture and metal powder, is coated on the upper part of the current applying device; and a step of forming a protection layer including metal powder on the upper part of the center heating layer.

Description

Road heating structure and construction method thereof {HEATING STRUCTURE FOR ROAD AND CONSTRUCTION METHOD OF THE SAME}

The present invention relates to a road heating structure, and more particularly to a road heating structure for preventing the freezing of the road in winter, and a construction method thereof.

Winter freezing causes road breakage and increases the risk of traffic accidents. Conventional road snow melting methods include spraying chloride-based ice melting agents and embedding heating wires in some areas where snow is concentrated.

However, in the case of chloride-based icing agent, the labor cost and material cost of spraying are continuously input and economic efficiency is reduced, and the penetration of chloride causes deterioration of concrete pavement, corrosion of reinforcing steel, and vehicle damage. In the case of electric heating wire, the initial installation cost is high, the construction is complicated, and there are difficulties in maintenance such as loss of function, defect, disconnection, and replacement due to exposure of electric heating wire, and it is difficult to spread due to high electricity usage fee.

The bridge pavement concrete is installed on the existing road surface and serves as a protective layer and has a thickness of about 5 ~ 8cm. Such cross-concrete paving concrete is exposed to vehicle load and deterioration environment, so it must have safe performance and long-term durability for efficient maintenance.

However, if the chloride-based icing agent is continuously sprayed on the pavement concrete, the icing agent penetrates into the interior when the piercing pavement cracks, which can seriously affect the durability of the concrete. And when the heating wire is embedded there is a problem that the integration behavior of the bridge pavement and the existing bottom plate due to the thickness of the concrete for the bridge pavement is reduced.

The present invention is to provide a heating structure for the road and a construction method thereof that can solve the problems caused by spraying chloride-based melt.

In addition, the present invention is to provide a road heating structure and its construction method that can lower the initial installation cost, simplify the construction, and facilitate maintenance compared to the method of embedding the heating wire.

In addition, the present invention is to provide a road heating structure and its construction method that can improve the long-term durability of cross-linked concrete.

Method for constructing a road heating structure according to an embodiment of the present invention, the step of forming an auxiliary base layer comprising any one of mortar and concrete, the step of installing an energizing device on top of the auxiliary base layer, Forming a exothermic intermediate layer by applying and drying the exothermic cement composite, the carbonaceous compound or mixture in which a part of the cemented carbide and the fine aggregate, and the metal powder are dried, to form a exothermic intermediate layer, And forming a protective layer including the metal powder mixed and dispersed on the upper portion of the exothermic intermediate layer.

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The carbonaceous compound or mixture includes at least one of graphite and coke, and the substitution rate of the carbonaceous compound or mixture is in the range of 5% by weight to 15% by weight relative to the weight of the cemented carbide and the weight of the fine aggregate. It may fall in the range of 10% to 50% by weight.

The incorporation rate of the metal powder in the exothermic intermediate layer may range from 0.05% to 3.0% by volume relative to the total volume of the exothermic cement composite composition. The metal powder in the exothermic interlayer and the protective layer may comprise at least one of steel fiber powder, aluminum regenerated powder, and copper regenerated powder.

The incorporation rate of the metal powder relative to the total volume of the protective layer in the protective layer may be in the range of 0.035% to 0.045%.

Road heating structure according to an embodiment of the present invention, iii) includes an auxiliary base comprising any one of mortar and concrete, and ii) a plurality of metal plates located on top of the auxiliary base and electrically connected to the power supply. An exothermic intermediate layer formed by an energizing device, and iii) an exothermic cement composite composition comprising a cemented carbide, fine aggregate, carbonaceous compound or mixture, and metal powder, which is located on top of the energizing device; It is formed in, and the metal powder comprises a protective layer uniformly mixed therein dispersed therein.

The carbonaceous compound or mixture in the exothermic interlayer may comprise at least one of graphite and coke. The metal powder in the exothermic interlayer and the protective layer may comprise at least one of steel fiber powder, aluminum regenerated powder, and copper regenerated powder.

The exothermic intermediate layer may have a thickness of 10 mm to 100 mm. The protective layer may have a thickness of 20 mm to 100 mm.

The road heating structure can exert the heat generation performance in the base layer of the structure by arranging the layer in which the actual heat generation in the middle. And since the exothermic intermediate layer contains a carbon-based compound or a mixture and a metal powder, it is possible to generate heat in a short time by increasing the current carrying capacity, and because the continuity as a conductor can be performed stably to prevent the melting and freezing.

In addition, the road heating structure can protect the heat generating intermediate layer by forming a protective layer and can integrate each layer constituting the road heating structure. In addition, the protective layer including the metal powder may more efficiently transfer heat generated in the intermediate heating layer to the surface layer of the heating structure, and increase the temperature duration.

1 is a process flowchart showing a construction method of a road heating structure according to an embodiment of the present invention.
2 is a cross-sectional view of a road heating structure according to an embodiment of the present invention.
3 is a photograph taken immediately after pouring the exothermic cement composite composition to form an exothermic intermediate layer.
4 is a photograph taken immediately after pouring concrete to form a protective layer.
5 is a graph showing compressive strength results according to curing age.
6 is a graph showing an exothermic temperature measurement result.
7 is a graph showing the surface temperature of the heat generating structure with time.
8 is a photograph of the surface state of the heating structure before and after the experiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1 is a process flow chart showing a construction method of a road heating structure according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the road heating structure according to an embodiment of the present invention.

1 and 2, the construction method of the road heating structure 100 includes a first step (S10) of forming the auxiliary base layer 10 and an energization device 20 on the auxiliary base layer 10. The second step (S20) to install, the third step (S30) to form a heat generating intermediate layer 30 by applying and drying the heating cement composite composition on the upper portion of the power supply device (S20) and the top of the heat generating intermediate layer (30) And forming a protective layer 40 in the fourth step (S40).

The road heating structure 100 of this embodiment is applied to both the case of new construction and the case of repairing an existing road.

When the existing road is being repaired, a portion of the existing road is removed to form a groove having a proper size, and the auxiliary base layer 10, the energizing device 20, the heat generating intermediate layer 30, and the protective layer 40 are formed inside the groove. ) To complete the road heating structure (100). The protective layer 40 of the road heating structure 100 may have the same color as the protection layer of the existing road, and may minimize the difference in appearance of the road due to the installation of the road heating structure 100.

In the first step S10, the auxiliary base layer 10 includes mortar or concrete. The auxiliary base layer 10 is formed on a surrounding object (for example, a roadbed in the case of a road) on which the road heating structure 100 is installed, and generates heat for road by increasing the adhesion performance between the surrounding object and the road heating structure 100. The structure 100 may be installed stably on a road or other structure.

After forming the auxiliary base layer 10, a surface treatment operation may be performed to impart the roughness to the surface of the auxiliary base layer 10. When surface-treating the auxiliary base 10, equipment, such as a wire brush with a wire, can be used. The roughness of the surface of the auxiliary base layer 10 may increase the adhesion of the intermediate layer 30 to the auxiliary base layer 10.

In the second step S20, the power supply device 20 includes a plurality of metal plates 21 disposed on the auxiliary base layer 10, a power supply device 22 located outside the road heating structure 100, and And a plurality of wirings for electrically connecting the plurality of metal plates 21 and the power supply device 22. The metal plate 21 is made of various metals having high thermal conductivity, and for example, may be made of copper (Cu).

The plurality of wirings are actually positioned on the auxiliary base layer 10 like the metal plate 21 and completely covered by the heat generating intermediate layer 30, and part of the wires are exposed to the outside of the road heating structure 100 so that the power supply device 22 ). In FIG. 2, an illustration of actual wiring is omitted, and the structure in which the plurality of metal plates 21 are electrically connected to the power supply device 22 is schematically illustrated.

The power supply device 20 is not limited to the above-described configuration, any configuration can be applied as long as it is electrically connected to the external power supply device 22 to provide heat to the heat generating intermediate layer 30.

In the third step (S30), the exothermic cement composite composition may include ultra rapid harding cement, fine aggregate, carbonaceous compound or mixture in which a portion of superfine cement and fine aggregate are substituted, and metal powder. The carbonaceous compound or mixture may include at least one of graphite and coke, and the metal powder may include steel fiber powder, aluminum recycled powder, copper recycled powder, and the like.

Since the carbon-based compound or mixture has electrical conductivity and exothermicity, when the electricity is supplied to the exothermic intermediate layer 30 by the energizing device 20, the carbon-based compound or mixture functions to impart electrical conductivity and exothermicity to the exothermic intermediate layer 30. . Therefore, it is possible to prevent the winter freezing of the heat generating structure 100 for the road by generating heat due to resistance in the heat generating intermediate layer 30 by the carbon-based compound or mixture.

The substitution rate of the carbonaceous compound or mixture may be in the range of 5% to 15% by weight based on the weight of the cement and in the range of 10% to 50% by weight based on the weight of the fine aggregate.

When the substitution rate of the carbon-based compound or the mixture is less than 5% by weight and 10% by weight with respect to the weight of the cement and the fine aggregate, respectively, the electrical conductivity and the heat generation of the heat generating intermediate layer 30 may be weakened, thereby preventing the freezing effect. In addition, the time for reaching the desired exothermic temperature becomes long, and the exothermic rapidity may be lowered.

On the other hand, if the substitution rate of the carbon-based compound or mixture exceeds 15% by weight and 50% by weight with respect to the weight of the cement and the fine aggregate, respectively, the compressive strength of the heat generating intermediate layer 30 is lowered, resulting in long-term durability of the road heating structure 100. May adversely affect In addition, the carbon-based compound or mixture has a property that absorbs water when mixing the exothermic cement composite composition because the molecular structure is a porous structure. Therefore, the mixing efficiency of the exothermic cement composite composition may be lowered.

The metal powder is evenly mixed and dispersed in the exothermic cement composite composition and functions to impart continuity as a conductor so that the entire exothermic intermediate layer 30 can function as a conductor. That is, the metal powder has a function of shortening the time to reach the target heat generation temperature by increasing the power supply capability of the heat generating intermediate layer 30.

In addition, the metal powder increases the tensile strength of the exothermic intermediate layer 30 to increase the resistance to cracking, and disperses the crack generated in the exothermic intermediate layer 30 by uniform dispersion to reduce the crack width, thereby securing excellent durability performance. At the same time it increases the resistance to shock.

The incorporation rate of the metal powder relative to the total volume of the exothermic cement composite composition may be in the range of 0.05% to 3.0% by volume. If the mixing ratio of the metal powder is less than 0.05% by volume, the effect of increasing the current carrying capacity and the tensile strength by the metal powder may be deteriorated.If the mixing ratio of the metal powder is more than 3.0% by volume, the metal powder is separated from other materials to generate heat-generating cement. The mixing efficiency of the composite composition may be lowered.

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Since the exothermic intermediate layer 30 of the third step S30 includes the carbon-based compound or the mixture and the metal powder, the exothermic intermediate layer 30 is electrically conductive and exothermic, and generates heat to prevent freezing on the entire surface of the exothermic intermediate layer 30. . Therefore, the road heating structure 100 can more effectively suppress the winter freezing by increasing the heat generating area compared to the conventional heating wire laying method.

In the fourth step S40, the protective layer 40 covers and protects the heating intermediate layer 30, and allows the entire layers constituting the road heating structure 100 to be integrated. The protective layer 40 may be made of ordinary bottom plate concrete, or in the case of a road, may be made of cross-linked concrete.

In addition, the protective layer 40 may include metal powder uniformly mixed and dispersed therein. The protective layer 40 including the metal powder may transfer heat of the exothermic intermediate layer 30 more effectively and increase the duration of the transferred heat. The metal powder included in the protective layer 40 may be formed of the same material and the same size as the metal powder included in the heat generating intermediate layer 30.

The mixing ratio of the metal powder to the total volume of the protective layer 40 may be in the range of 0.035% to 0.045%. If the mixing rate of the metal powder is less than 0.035%, the heat transfer and heat sustaining effect by the metal powder is insufficient, and if the mixing rate of the metal powder exceeds 0.045%, the metal powder of the protective layer 40 may be exposed to the surface. have.

The thickness of the heating intermediate layer 30 may be in the range of 10mm to 100mm. If the thickness of the heat generating intermediate layer 30 is less than 10mm, it is difficult to implement sufficient heat generation performance, and if it exceeds 100mm, the construction cost may be increased, and the power consumption of the power supply device 20 to reach a desired heat generation temperature increases, which is economical. Can be degraded.

The thickness of the protective layer 40 may be in the range of 20mm to 100mm. If the thickness of the protective layer 40 is less than 20mm, the function of protecting the heat generating intermediate layer 30 may be deteriorated, and the long-term durability of the heat generating structure 100 may be degraded. When the thickness of the protective layer 40 exceeds 100mm, the surface temperature is lowered due to the excessive thickness of the protective layer 40, thereby lowering the heat generating efficiency and the freezing prevention effect.

The road heating structure 100 having the above-described configuration may exert a heat generation performance at the base layer of the structure by arranging a layer in which the actual heat generation occurs in the middle. In addition, since the exothermic intermediate layer 30 includes a carbon-based compound or a mixture and a metal powder, it is possible to generate heat in a short time by increasing the power supply capability, and because it has a continuity as a conductor, it is possible to stably perform a function of preventing snow and freezing. Can be.

In addition, the road heating structure 100 having the above-described configuration may protect the heat generating intermediate layer 30 by forming the protective layer 40, and may integrate each layer constituting the road heating structure 100. In addition, the protective layer 40 including the metal powder may more efficiently transfer heat generated in the heat generating intermediate layer 30 to the surface layer of the road heating structure 100, and increase the temperature duration.

3 is a photograph taken immediately after pouring the exothermic cement composite composition to form a heating intermediate layer, Figure 4 is a photograph taken immediately after pouring concrete to form a protective layer.

Next, the performance test result of a heat generating structure is demonstrated.

[Experiment 1]

Table 1 below is a compounding ratio of the exothermic cement composite composition for forming the exothermic intermediate layer, and designed to combine a target of 3 hours compressive strength of 21MPa or more, which is equivalent to conventional cross-linking concrete.

In Table 1, Comparative Example 1 does not include a carbon-based compound or mixture and metal powder. In Examples 1, 2, and 3, graphite was substituted by 5% by weight relative to the weight of cement, and in Examples 1, 2, and 3, coke was 10% by weight, 30% by weight, and 50% by weight based on the fine aggregate weight, respectively. Replaced. And in Examples 1, 2, 3, the mixing ratio of the metal powder to the total volume of the exothermic cement composite composition is in the range of 0.2% by volume to 0.4% by volume.

5 is a graph showing compressive strength results according to curing age.

Referring to FIG. 5, although the compressive strengths of Examples 1, 2 and 3 are lower than those of Comparative Example 1, it can be seen that Comparative Example 1 and Examples 1, 2 and 3 both satisfy the target strength for 3 hours. have.

6 is a graph showing an exothermic temperature measurement result. In FIG. 6, the solid line shows the case where the mixing rate of the metal powder is 4 volume% in Examples 1, 2, and 3, and the dotted line shows the case where the mixing rate of the metal powder is 2 volume% in Examples 1, 2, and 3.

Referring to FIG. 6, it can be seen that in Examples 1, 2, and 3, the target exothermic temperature reaches 40 ° C. regardless of the mixing ratio of the metal powder. However, it can be seen that the higher the mixing ratio of the metal powder, the shorter the time to reach the target heat generation temperature.

[Experiment 2]

Table 2 shows the mixing ratio of the exothermic cement composite composition for forming the exothermic intermediate layer and the concrete composition for forming the protective layer. The concrete composition for forming the protective layer is a combination design aimed at the design reference compressive strength of 24MPa.

The exothermic protective layer and the protective layer were respectively poured and the exothermic test was performed after 24 hours. The voltage applied to the experiment ranged from 50V to 220V, the experimental outside air was approximately minus 4 ° C, and the surface temperature of the heating structure was measured at intervals of 10 minutes after connecting the energizing device to the power source.

7 is a graph showing the surface temperature of the heating structure with time, Figure 8 is a photograph of the surface state of the heating structure before and after the experiment.

Referring to FIG. 7, the surface temperature of the heat generating structure rapidly increased 20 minutes after the current was supplied to the power supply device and the heat generating intermediate layer, and the surface temperature reached approximately 30 ° C. after 50 minutes after the power was supplied. Therefore, it can be seen that the ice on the surface of the heating structure disappears completely as shown in the photograph after the heating of FIG. 8.

[Experiment 3]

The maximum temperature of the heat generating structure according to the thickness of the heat generating intermediate layer and the protective layer was tested, and the results are shown in Table 3 below.

In Table 3, Comparative Example 2 is a case where the thickness of the heating intermediate layer is 20 mm and there is no protective layer. In Examples 4, 5 and 6, the thickness of the heat generating intermediate layer was 20 mm, and in Examples 4, 5 and 6, the thickness of the protective layer was 30 mm, 40 mm and 50 mm, respectively. After energizing the exothermic intermediate layer, the surface temperature of the exothermic structure was measured for 1 hour at intervals of 10 minutes.

As a result of the experiment, as the thickness of the protective layer increases, the maximum temperature of the heating structure is lowered. However, when the amount of current flowing through the intermediate layer of heat is similar, the maximum temperature is similar even when the thickness of the protective layer is 50 mm. Therefore, the thickness of the protective layer can be allowed up to 50mm.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

100: road heating structure 10: auxiliary substrate
20: energization device 21: metal plate
22: power supply device 30: heat generating intermediate layer
40: Protective layer

Claims (12)

Forming an auxiliary substrate comprising any one of mortar and concrete;
Installing an energization device on top of the auxiliary substrate;
Forming an exothermic intermediate layer by applying and drying an exothermic cement composite composition including a cemented carbide cement, a fine aggregate, a carbonaceous compound or mixture in which a portion of the cemented carbide cement and the fine aggregate are substituted, and a metal powder on an upper portion of the electricity supply device; And
Forming a protective layer including a metal powder uniformly mixed therein and dispersed therein, on top of the heat generating intermediate layer
Construction method of a road heating structure comprising a. delete delete The method of claim 1,
The carbonaceous compound or mixture includes at least one of graphite and coke,
The substitution rate of the carbon-based compound or mixture is in the range of 5% by weight to 15% by weight based on the weight of the cemented carbide, and for roads in the range of 10% by weight to 50% by weight based on the weight of the fine aggregate. Construction method of a heating structure. The method of claim 1,
The mixing rate of the metal powder in the exothermic intermediate layer is a method of construction of a road heating structure for the range of 0.05% to 3.0% by volume relative to the total volume of the exothermic cement composite composition. The method of claim 1,
And the metal powder in the exothermic intermediate layer and the protective layer comprises at least one of steel fiber powder, aluminum regenerated powder, and copper regenerated powder. delete The method of claim 1,
The method of constructing a road heating structure for the metal layer to the total volume of the protective layer in the protective layer is in the range of 0.035% to 0.045%. An auxiliary substrate comprising any one of mortar and concrete;
An electricity supply device positioned above the auxiliary substrate and including a plurality of metal plates electrically connected to the power supply device;
An exothermic intermediate layer formed on the top of the energizing device and formed by an exothermic cement composite composition including cemented carbide, fine aggregate, carbon-based compound or mixture, and metal powder; And
A protective layer formed on the heat generating intermediate layer, the metal powder is uniformly mixed and dispersed therein
Road heating structure comprising a. 10. The method of claim 9,
The carbonaceous compound or mixture in the exothermic interlayer comprises at least one of graphite and coke,
In the exothermic intermediate layer and the protective layer, the metal powder includes at least one of steel fiber powder, aluminum regenerated powder, and copper regenerated powder. 10. The method of claim 9,
The heating intermediate layer is a road heating structure having a thickness of 10mm to 100mm. 10. The method of claim 9,
The protective layer is a road heating structure having a thickness of 20mm to 100mm.

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