WO2022050508A1

WO2022050508A1 - Method for constructing snow-melting pavement for roads by using planar heating composite sheet

Info

Publication number: WO2022050508A1
Application number: PCT/KR2020/017725
Authority: WO
Inventors: 옥창권
Original assignee: (주)이노로드
Priority date: 2020-09-04
Filing date: 2020-12-07
Publication date: 2022-03-10
Also published as: KR102231955B9; KR102231955B1

Abstract

The present invention relates to a method for constructing snow-melting pavement for roads by using a planar heating composite sheet, the method comprising: a road pavement cutting step of cutting the surface of road pavement to a certain thickness to form an installation surface; a planar heating composite sheet preparation step of preparing a planar heating composite sheet including a planar heating layer and a thermal insulation layer attached to the lower side of the planar heating layer; a planar heating composite sheet winding step of winding the prepared planar heating composite sheet on installation equipment; a planar heating composite sheet installation step of installing the planar heating composite sheet wound on the installation equipment, on the installation surface; and an asphalt concrete repaving step of repaving asphalt concrete on the upper side of the planar heating composite sheet. According to the present invention as described above, more rapid construction is enabled through a construction method in which a sheet wound on a roll is installed on an installation surface, and thus the construction period is remarkably shortened, and accordingly, construction costs can be greatly reduced. In addition, there is the effect of remarkably enhancing the snow-melting efficiency of snow-melting pavement by more reliably preventing downward heat loss.

Description

Construction method of snow melting pavement of road using surface heating composite sheet

The present invention relates to a snow melting pavement construction method for a road using a planar heating composite sheet, and more particularly, faster construction through a construction method in which a composite sheet in which a planar heating sheet and an insulating sheet are bonded is unwound from a roll and installed on the road. It relates to a snow-melting pavement construction method for roads using a planar heating composite sheet that makes this possible.

In general, among traffic accidents occurring on roads, the ratio of slip accidents due to road icing in winter is high.

Therefore, the occurrence of human casualties and enormous property damage due to large and small traffic accidents caused by icing on the road surface in winter is increasing year by year.

In addition, although the initial work is very important for snow removal due to snowfall, if it is already difficult to access the site due to freezing, the snow removal operation is relatively delayed, greatly increasing the risk of severe traffic congestion and traffic accidents.

On the other hand, although the effect of snowmelt on weak snow is resolved over time, fundamental measures for snow accumulation and icing on the road surface during the transitional period of the snowmelting process and a sharp drop in the minimum temperature at night have not been established in most cases.

Calcium chloride spraying, which is a snow removal agent using a snow removal vehicle, is widely used as the easiest means to prevent this, but it is pointed out as a serious problem by environmental groups and road officials due to corrosion damage to road facilities and various negative effects on the environment. am.

Therefore, by applying a more immediate and efficient snow removal method along with an initial response to snow accumulation on steep slopes, overpasses, and tunnel entrances and exits, which are vulnerable to snow and ice in winter, the dangers of life due to chaotic traffic accidents of drivers traveling in winter and yearly There is a demand for an eco-friendly snow removal method to prevent a huge economic loss.

In accordance with the above requirements, conventionally, a heating medium in the form of a heating network in which a heating cable is arranged in a zigzag form on a mesh-shaped metal frame is buried in the surface of the road to melt the road using the heat emitted from the heating cable. A method has been proposed.

However, in the above method, most of the heat emitted from the heating cable is transferred to the lower part and lost to the ground, so the heat transfer time to the surface of the road is rather long, and the amount of heat transferred is not large, so the snow melting operation of the road is not performed properly. There is no problem.

The reason for the above problem is that the general thickness of the asphalt concrete pavement layer of the road is 20-40 cm, but since the heating cable is buried 5-10 cm from the surface of the asphalt concrete pavement layer, the heat generated from the heating cable is greater than the upper part of the lower part because they are trying to move to

In addition, the heating network as above has a problem in that the maintenance cost due to frequent re-construction increases as the heating cable is damaged by the asphalt concrete or equipment load applied during construction and the wheel load applied after construction and loses its function.

Accordingly, recently, as shown in FIG. 1, a groove 200 having a predetermined depth and length is formed from the surface of the road, and an insulating material 300 for preventing heat loss to the bottom inside the groove 200, After sequentially installing the accommodating member 400 of a metal material having excellent thermal conductivity for accommodating the heating cable 500, the heating cable 500 and the fixing member 600 for fixing the upper end of the accommodating member 400 , a linear heating method in which the heat conductive layer 700 is formed by filling a heat conductive resin solution on the accommodating member 400 is mainly used.

In the above-mentioned linear heating method, heat loss to the ground is prevented through the insulating material 300 disposed below, and most of the heat emitted from the heating cable 500 through the thermally conductive accommodating member 400 and the heat conductive layer 700 As it is transferred to the road surface quickly, the snow melting efficiency of the road is greatly improved.

However, in the above method, the operation of forming a plurality of grooves 200 having a predetermined depth and length on the road, the operation of removing dust inside the groove 200, and the installation of the insulating material 300 in the groove 200 Operation, installation of the accommodating member 400 on the upper portion of the insulating material 300 , the operation of installing the heating cable 500 in the interior of the accommodating member 400 , and a fixing member for fixing the upper portion of the accommodating member 400 . The installation work is cumbersome as well as the installation work because a number of tasks including the operation of installing the 600 and the operation of filling the thermal conductive resin solution for forming the thermal conductive layer 700 on the upper portion of the receiving member 400 must be performed There is a problem in that it takes a lot of time to work.

In addition, in this method, the heat dissipated from the heating cable 500 through the thermally conductive accommodating member 40 and the thermally conductive layer 70 is installed to prevent heat loss underground by installing the insulating material 300 on the bottom surface of the groove 200 . was intended to be rapidly transferred to the road surface, but in reality, the heat emitted from the heating cable 500 is lost downward through both sides of the accommodating member 400 and the heat conductive layer 700 in the process of being transferred to the road surface, so that the heat transfer efficiency There is a very low problem with this.

The present invention has been devised to solve the above problems, and an object of the present invention is to manufacture a planar heating composite sheet of a structure that is not damaged by asphalt concrete or equipment load applied during construction, and install a sheet wound on a roll An object of the present invention is to provide a snow melting pavement construction method for a road using a surface heating composite sheet that enables faster construction through the construction method of laying on the surface.

According to the present invention for achieving the above object, a road pavement cutting step of cutting the surface of the road pavement to a certain thickness to form an installation surface, and a planar heating layer comprising a planar heating layer and a heat insulating layer attached to the lower portion of the planar heating layer A planar heating composite sheet preparation step to prepare a composite sheet and a planar heating composite sheet winding step of winding the prepared planar heating composite sheet to an installation equipment and a planar heating composite sheet wound on the installation equipment Laying the planar heating composite sheet on the installation surface There is provided a snow melting pavement construction method of a road using a planar heating composite sheet, comprising the step of installing a heating composite sheet and an asphalt concrete repaving step of repaving asphalt on the upper part of the flat heating composite sheet.

Here, the planar heating composite sheet is applied along the width direction of the base sheet to the base sheet of a synthetic resin material having a certain width and length and the upper surface of the base sheet, and different polarities are spaced apart along the longitudinal direction of the base sheet Planar heating comprising a conductive paste that is applied as a whole between a plurality of electrodes arranged alternately and the plurality of electrodes among the upper surfaces of the base sheet and generates heat by electrical resistance and an insulating sheet made of a synthetic resin material attached to the top of the conductive paste It is characterized in that it comprises a layer, and a heat insulating layer comprising a protective sheet of synthetic resin material attached to the lower portion of the planar heating layer and the insulating sheet is impregnated with airgel in the nonwoven fabric of the synthetic resin material and the insulating sheet is attached to the lower portion of the planar heating layer.

And, the thickness of the heat insulating layer is characterized in that 1 ~ 5mm.

On the other hand, the conductive paste contains 20 to 40 parts by weight of an amorphous co-polyester resin, 2.5 to 7.5 parts by weight of carbon nanotubes, 2.5 to 7.5 parts by weight of carbon nanoplates, and the remaining amount is graphene (graphene). ), silver (Ag) powder, carbon dispersant and solvent.

In addition, the carbon dispersant is characterized in that at least two or more of carboxymethyl cellulose, polystyrene sulfonate, chondroitin sulfate, and hyaluronic acid are used in combination.

In addition, it is attached to the upper portion of the planar heating layer and the lower portion of the heat insulating layer, it characterized in that it further comprises a protective layer impregnated with asphalt and rubber in the synthetic resin material.

In addition, in the planar heating composite sheet installation step, at least two planar heating composite sheets are installed to be spaced apart along the width direction of the road, and the electrodes of the same polarity of each adjacent planar heating composite sheet are directly connected with a conductive line. characterized.

According to the present invention as described above, since faster construction is possible through the construction method of installing the sheet wound on the roll on the installation surface, the construction period is significantly shortened, and thus the construction cost can be greatly reduced.

In addition, there is an effect that the snow melting efficiency of the snow melting pavement is remarkably improved by more reliably preventing the heat loss downward.

A drawing for explaining the step of winding a planar heating composite sheet of a snow melting pavement construction method according to an example.

Figure 8 is a view for explaining the installation step of the planar heating composite sheet of the snow melting pavement construction method according to an embodiment of the present invention.

9a and 9b are views for explaining the connection structure between the electrodes of the planar heating composite sheet of the snow melting pavement construction method according to an embodiment of the present invention.

Figure 10 shows in detail the connection structure between the electrodes of the planar heating composite sheet of the snow melting pavement construction method according to an embodiment of the present invention.

11 is a view for explaining the asphalt concrete repaving step of the snow melting pavement construction method according to an embodiment of the present invention.

12 is a graph comparing the temperature increase rate of the conventional snowmelting pavement of the onboard heating method and the snowmelting pavement constructed by the snowmelting pavement construction method according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings. It should be noted that the same components in the drawings are denoted by the same reference numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

Figure 2 shows the process sequence of the snow-melting pavement construction method of the road using the planar heating composite sheet according to an embodiment of the present invention, Figure 3 is the road pavement cutting of the snow-melting pavement construction method according to an embodiment of the present invention 4 is a perspective view of a planar heating composite sheet used in a snowmelting pavement construction method according to an embodiment of the present invention, and FIG. 5 is a snowmelting pavement construction method according to an embodiment of the present invention. An exploded perspective view of the planar heating composite sheet used, FIG. 6 is a cross-sectional view AA' of FIG. 3, and FIG. 7 is a view for explaining the winding step of the planar heating composite sheet of the snow melting pavement construction method according to an embodiment of the present invention. , FIG. 8 is a view for explaining the step of installing a surface heating composite sheet of a snow melting pavement construction method according to an embodiment of the present invention, and FIGS. 9a and 9b are plane views of a snow melting pavement construction method according to an embodiment of the present invention It is a view for explaining the connection structure between the electrodes of the heating composite sheet, and FIG. 10 shows in detail the connection structure between the electrodes of the planar heating composite sheet of the snow melting pavement construction method according to an embodiment of the present invention, FIG. It is a view for explaining the asphalt concrete repaving step of the snow melting pavement construction method according to an embodiment of the present invention.

2, the snow-melting pavement construction method of the road using the planar heating composite sheet according to an embodiment of the present invention is a road pavement cutting step (S1), a planar heating composite sheet preparation step (S2), winding a planar heating composite sheet It includes a step (S3), a planar heating composite sheet installation step (S4), an asphalt concrete repacking step (S5).

In the road pavement cutting step, as shown in FIG. 3 using a rod cutter, the road pavement is cut to a predetermined thickness d to form the installation surface (B) of the planar heating composite sheet. Here, the thickness d is 5 to 10 cm, more preferably about 7 to 8 cm. (S1)

In the planar heating composite sheet preparation step, a planar heating composite sheet having a certain width and length is prepared. The planar heating composite sheet used in the present invention is wound in the form of a roll and can be installed on the road surface while being unwound from the roll during construction. It is characterized by a structure.

As shown in FIGS. 4 to 6 , the planar heating composite sheet 1 includes a planar heating layer 10 , a heat insulating layer 20 and a protective layer 30 .

The planar heating layer 10 generates heat by electrical resistance when power is supplied, and includes a base sheet 11 , an electrode 12 , a conductive paste 13 , and an insulating sheet 14 .

The base sheet 11 is a synthetic resin material that provides an area to which the electrode 12 and the conductive paste 13 are applied, and prevents the current applied to the electrode 12 or the conductive paste 13 from leaking downward. It performs an insulating function.

The electrodes 12 are provided along the width direction of the base sheet 11 and are alternately arranged with different polarities spaced apart from each other at regular intervals along the length direction of the base sheet 11 as providing an input/exit path of the supplied current. .

The electrode 12 is formed by applying and curing a paste containing silver (Ag) powder on the upper surface of the base sheet 11 .

The conductive paste 13 generates heat due to electrical resistance when a current is applied, and is entirely applied between the plurality of electrodes 12 among the upper surfaces of the base sheet 11 .

Here, the conductive paste 13 includes 20-40 parts by weight of an amorphous co-polyester resin as a binder, 2.5-7.5 parts by weight of carbon nanotubes, 2.5-7.5 parts by weight of carbon nanoplates, and the remainder as graphene, silver (Ag) powder, carbon dispersant and solvent.

The amorphous co-polyester resin as a binder allows the conductive paste 13 to have uniform dispersibility and excellent applicability, and to maintain binding force to the base sheet 11 .

In particular, the amorphous co-polyester resin applies a tensile stress to the conductive paste 13, and if it is less than 20 parts by weight, sufficient tensile stress is not applied to the conductive paste 13, and exceeds 40 parts by weight. If the conductive paste 13 does not properly develop the conductive function, it is preferable to use between 20 and 40 parts by weight.

Carbon nanotubes and carbon nanoplates are conductive materials, and when less than 2.5 parts by weight, the conductive function is not properly expressed, and when it exceeds 7.5 parts by weight, conductive paste provided through an amorphous co-polyester resin (13) It is preferable to contain 2.5 to 7.5 parts by weight, respectively, since it may damage the tensile stress of the.

The solvent is to dissolve the amorphous co-polyester resin, alpha-terpineol, butyl cellosolve, ethyl cellosolve, ethyl carbitol, butyl carbitol, ethoxyethyl acetate, butyl acetate, propylene glycol monomethyl ether, r-gamma butyrolactone (γ-butyrolactone), methyl ethyl ketone (methyl ethyl ketone) or a combination thereof.

As the conductive paste 13 of the present invention has the above composition ratio, tensile stress is applied to the conductive thin film formed by the conductive paste 13, so that the asphalt concrete or equipment load applied during the snow melting pavement construction of the road and the applied after construction Since it can resist the shear force generated by the wheel load, it is possible to minimize the damage of the conductive thin film by the shear force.

The insulating sheet 14 is made of a synthetic resin material and is attached to the upper portions of the electrode 12 and the conductive paste 13, and performs an insulating function to prevent current applied to the electrode or conductive paste from leaking upward.

The heat insulating layer 20 is to prevent the heat emitted from the planar heating layer 10 from being lost to the ground, and to the lower part of the heat insulating sheet 21 and the heat insulating sheet 21 attached to the lower part of the planar heating layer 10 and a protective sheet 22 to which it is attached.

Since the planar heating composite sheet 1 of the present invention is constructed at a shallow depth of about 7 to 8 cm from the road surface, the material, structure and thickness of the heat insulating layer 20 are very important. That is, in the case of a generally used thick insulator, it can be easily damaged or damaged by asphalt concrete or equipment load during the construction process.

The insulation sheet 21 of the present invention for simultaneously satisfying the conditions of thickness and insulation efficiency is made of a structure in which airgel is impregnated in a nonwoven sheet made of a synthetic resin material, and the insulation layer 20 including the protective sheet 22 is 1 to It is made to have a thickness of between 5 mm.

Here, the airgel is composed of a structure containing more than 90% of fine air inside and has excellent thermal insulation performance to block heat through convection, conduction, and radiation, so that the heat emitted from the planar heating layer 10 is lost to the ground. will definitely prevent it.

In addition, the nonwoven sheet made of synthetic resin serves as a frame that can distribute the airgel in the form of a sheet, and is manufactured to have a tensile stress of 2 to 20 MPa, so that asphalt concrete or equipment load applied during snow melting pavement construction of roads and applied after construction Since it can resist the shear stress generated by the wheel load, it is desirable to prevent the airgel from being damaged by the shear stress.

If the thickness of the insulation layer 20 is less than 1mm, the insulation effect is insufficient, and if the thickness is 5mm or more, the risk of damage due to asphalt concrete or equipment load increases during construction.

The protective sheet 22 is a synthetic resin material and is attached to the lower portion of the heat insulating sheet 21, and serves to prevent the fine air contained in the airgel from being separated to the outside, and the asphalt is used for the insulation sheet 21 during construction. It plays a role in preventing penetration into the micropores of the airgel.

The protective layer 30 serves to prevent the planar heating layer 20 and the heat insulation layer 30 from being damaged by shear stress generated by asphalt concrete or equipment load applied during snowmelting pavement construction, and wheel load applied after construction. As to do, it is attached to the upper part of the planar heating layer 20 and the lower part of the heat insulating layer 30, respectively.

The protective layer 30 has a structure in which asphalt and rubber are impregnated in a nonwoven fabric made of synthetic resin.

Here, the reason for using the nonwoven fabric made of synthetic resin is to resist shear stress generated by asphalt concrete or equipment load during construction and wheel load after construction through tensile stress, as described above.

And, the reason for impregnating asphalt and rubber is to secure sufficient adhesion with asphalt concrete during construction. (S2)

In the planar heating composite sheet winding step, the planar heating composite sheet (1) prepared as above is wound on the roll (R) of the installation equipment (A) as shown in FIG. 7 . (S3)

In the planar heating composite sheet installation step, as shown in FIG. 8, while moving the installation equipment (A) along the installation surface (B), the planar heating composite sheet wound on the roll (R) of the installation equipment (A) (1) is installed on the installation surface (B).

At this time, as shown in FIGS. 9a and 9b so that the planar heating composite sheet 1 can be disposed in the area corresponding to the wheel, at least two planar heating composite sheets 1 are spaced apart along the width direction of the road. placed in parallel

And, the electrodes 12 of different polarities disposed along the longitudinal direction of each of the planar heating composite sheet 1 are connected to the power supply means through the conductive wire.

As shown in Figure 9a, the power supply structure of a general road snowmelting device connects each electrode 12 of each planar heating composite sheet 1 to a power supply means through a conductive wire 40, respectively. used

However, in the above method, since each electrode 12 must be individually connected to the power supply means through the conductive wire 40, the installation work is cumbersome and the number of conductive wires 40 is large, so it takes a bit of time to align them. It takes

In addition, since each conductive wire 40 is installed across the area where the planar heating composite sheet 1 is disposed, that is, the area in which the wheel is in contact, a problem in that the conductive wire 40 is disconnected by the wheel load may occur. there is.

For the above reasons, in the present invention, as shown in FIG. 9b , the electrodes 12 of the same polarity of each adjacent planar heating composite sheet 1 are directly connected through a conductive line 40, and the same A method of connecting only one of the polarized electrodes to the power supply was adopted.

More specifically, the present invention, as shown in FIG. 10, a through hole (h) penetrating the insulating sheet and the protective layer disposed on the edge of each electrode 12 of the adjacent planar heating composite sheet (1) between each electrode 12 of the adjacent planar heating composite sheet 1 by spot welding both ends of the strip-shaped conductive wire 40 to each electrode 12 exposed through the through hole h were interconnected.

Through this, in the present invention, the length of the conductive wire 40 is significantly reduced compared to the prior art, and the installation work is easy in a way that connects the adjacent electrodes 12, and the conductive wire 40 does not overlap each other. A separate sorting operation is not required.

In addition, since the conductive wire 40 is not installed in the area to which the wheel load is applied, the problem that the conductive wire 40 is disconnected by the wheel load does not occur (S4).

In the asphalt concrete resurfacing step, as shown in FIG. 11, asphalt concrete is laid to a certain thickness using a finisher on the upper portion of the planar heating composite sheet (1), and then the installed asphalt concrete is compacted using a compactor (C). Repave the asphalt concrete on top of the planar heating composite sheet (1). (S5)

12 is a graph comparing the temperature increase rate of the conventional snow-melting pavement of the linear heating method and the snow-melting pavement constructed by the snow-melting pavement construction method according to an embodiment of the present invention.

Referring to FIG. 12, in the case of the conventional snow melting pavement of the conventional shipboard heating method, the time it takes to reach the surface temperature from -5°C to 2°C is 358 minutes at 300W/m ² of calorific value per unit area, and 125 minutes at 600W/m ² , 82 minutes at 900 W/m ² and 63 minutes at 1200 W/m ² .

On the other hand, in the case of a snowmelting pavement in which a planar heating composite sheet is embedded according to the snowmelting pavement construction method according to an embodiment of the present invention, the time it takes to reach from -5℃ to 2℃ is 300W/m ² of calorific value per unit area 141 minutes, 600W/m ² at 67 minutes, 900W/m ² at 48 minutes, and 1200W/m ² at 39 minutes, the snowmelting efficiency of the snowmelting pavement constructed according to the snowmelting pavement construction method according to an embodiment of the present invention is It can be seen that not only is remarkably excellent, but also power consumption can be significantly reduced.

Although the present invention has been described with reference to the above preferred embodiments, various modifications and variations can be made without departing from the spirit and scope of the invention. Accordingly, the appended claims are intended to cover such modifications and variations as fall within the subject matter of the present invention.

Claims

A road pavement cutting step of cutting the surface of the road pavement to a predetermined thickness to form an installation surface;

A planar heating composite sheet preparation step of preparing a planar heating composite sheet comprising a planar heating layer and a heat insulating layer attached to a lower portion of the planar heating layer;

A planar heating composite sheet winding step of winding the prepared planar heating composite sheet to installation equipment;

A planar heating composite sheet installation step of installing the planar heating composite sheet wound on the installation equipment on the installation surface;

Snow melting pavement construction method for roads using a planar heating composite sheet, characterized in that it comprises an asphalt concrete repaving step of repaving asphalt on the upper portion of the planar heating composite sheet.
The method of claim 1,

The planar heating composite sheet is

A base sheet made of a synthetic resin material having a predetermined width and length and a plurality of electrodes applied along the width direction of the base sheet on the upper surface of the base sheet and alternately arranged with different polarities spaced apart from each other along the length direction of the base sheet; A planar heating layer comprising a conductive paste which is applied as a whole between the plurality of electrodes on the upper surface of the base sheet and generates heat by electric resistance and an insulating sheet made of a synthetic resin material attached to the upper portion of the conductive paste;

Snowmelting pavement construction of a road, characterized in that it includes an insulation layer attached to the lower portion of the planar heating layer and comprising an insulation sheet in which airgel is impregnated in a nonwoven fabric made of synthetic resin and a protective sheet made of a synthetic resin material attached to the lower portion of the insulation sheet method.
The method of claim 1,

The thickness of the insulating layer is a snow melting pavement construction method using a planar heating composite sheet, characterized in that 1 ~ 5mm.
The method of claim 1,

The conductive paste is

20 to 40 parts by weight of amorphous co-polyester resin, 2.5 to 7.5 parts by weight of carbon nanotubes, 2.5 to 7.5 parts by weight of carbon nanoplates, and the remaining amount of graphene, silver (Ag) A method for snow-melting pavement construction using a planar heating composite sheet, characterized in that it contains powder, a carbon dispersant and a solvent.
5. The method of claim 4,

The carbon dispersing agent is carboxymethyl cellulose (carboxymethyl cellulose), polystyrene sulfonate (polystyrene sulfonate), chondroitin sulfate (chondroitin sulfate), hyaluronic acid (hyaluronic acid) at least two or more of a combination of two or more of a planar heating composite sheet, characterized in that it is used The construction method of snow melting pavement of the road used.
The method of claim 1,

The snow melting pavement construction method of the road using the planar heating composite sheet, which is attached to the upper part of the planar heating layer and the lower part of the insulating layer, and further comprises a protective layer impregnated with asphalt and rubber in a synthetic resin material. .
The method of claim 1,

In the planar heating composite sheet installation step, at least two planar heating composite sheets are installed to be spaced apart along the width direction of the road, and the electrodes of the same polarity of each adjacent planar heating composite sheet are directly connected with a conductive line. A snow melting pavement construction method using a surface heating composite sheet.