JP3192925U - Support beam snow melting device for road signs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a heat generating member to an outer surface of the support beam instead of providing a heat source inside the support beam of a road sign, and to suppress heat absorption of the heat generating member by the support beam on the support beam. Provided is a snow melting device for a support beam for a road sign that melts and disappears snow that is about to fall or accumulate snow. SOLUTION: A plurality of snow melting units 2 are provided on an upper outer surface of a support beam 54 of a road sign. The snow melting unit 2 is fixed to the support beam 54 via a fixing tool such as a binding band 3 in order to melt the snow that falls on the support beam 54 or is about to accumulate snow. The snow melting unit 2 is mainly a laminate in which the snow receiving plate 7, the heat-resistant insulating sheet 8, the planar heat generating sheet 6, and the base sheet 9 are laminated. The planar heat-generating sheet 6 includes a planar heat-generating element 6a that generates heat when energized from a power supply device, and the planar heat-generating element 6a is formed in a flexible film-like, sheet-like, or other planar shape. [Selection diagram] Fig. 5

Description

  The present invention relates to a snow melting device for a road beam for a road sign, which is attached to the road beam of a road sign and melts and disappears the snow falling or snowing on the support beam.

  On roads such as general expressways and expressways, road signs and other information facilities for roads (hereinafter simply referred to as “road signs”) are installed above the road surface and above the shoulders of the travel route. A road sign transmits various information such as road information to a driver, and mainly includes an electric bulletin board and a sign board for displaying various information, and a support structure for supporting the electric bulletin board and the sign board. I have.

  There are highway information boards, highway signs, national highway information boards, tunnel information boards, etc. in the electric signboards and sign boards of the road signs. The supporting structures include T-type pillars, F-type pillars, composite pillars, There are portal columns. Among the support structures, the T column includes an overhang column, a flangeless T column, etc., and the portal column includes a four-sided truss beam portal column, a horizontal two-beam beam portal column and a horizontal two-column column. There are face-beam R-type pillars and single-column-type pillars.

  Here, the support structure described above is generally a support beam for supporting an electric bulletin board or a sign board in the air, regardless of the form of a T-type column, F-type column, composite column, or portal column. have. For example, in the case of a gate-type pillar road sign, the support beam of the support structure is installed above the road surface of the traveling lane across the road.

  Since such road sign support beams are installed outdoors in the air, there is a risk of snow falling on the outer surface and falling from the support beams and colliding with the windshield of the vehicle traveling in the driving lane. In some cases, such snowfall sometimes obstructs the driver's field of view with snow, causing serious obstacles to vehicle travel.

  Moreover, such snowfall from the support beam to the vehicle is not necessarily limited to the gate-type column road sign. For example, the support beam such as the T-type column, the F-type column, or the composite column is relatively Even if a short road sign is installed in a city road with a narrow roadside belt, there are many cases where the support beam protrudes on the traveling lane, so that it may occur in the same manner.

  Therefore, in order to solve such problems related to snowfall, a snow melting device for supporting beams for road signs has also been proposed. For example, in Japanese Utility Model Laid-Open No. 6-35303, hot air is blown to the inner peripheral cavity of a structural material such as a large-diameter round steel pipe used for the support beam to heat the support beam from the inside. There has been proposed a snow melting device that melts and disappears (snow melts) snow that falls on the outer peripheral surface or is about to accumulate snow.

  However, the snow melting device that blows hot air to the support beam has a relatively large structure that supports heavy objects such as information display boards on the road in a state where the support beam crosses the road for several lanes like a portal column. In order to ensure rigidity, thick structural materials such as large-diameter round steel pipes are used for the support beam, so the heat loss of the support beam increases and heat is transmitted from the inner periphery to the outer periphery of the support beam. There was a problem that it was difficult to transfer heat.

  In addition, since the hot air blown into the support beam uses the entire inner cavity portion of the support beam as a flow path, the entire outer periphery of the support beam is heated. For this reason, the heat of the hot air is not consumed only for heating the upper part of the support beam having a large amount of snow, but also for heating the side or lower part of the support beam having a small amount of snow or no snow. Therefore, there has been a problem that the amount of heat used for melting snow is lowered and the snow melting ability of the snow melting device is lowered.

  Furthermore, since a metal material having a relatively low thermal resistance (for example, a metal material such as general structural carbon steel) is used for the support beam, the heat beam is gradually absorbed by the support beam in the process of moving in the support beam. However, since the amount of heat decreases, there is a problem that it is difficult to heat the support beam evenly over the entire longitudinal direction.

  Therefore, the present invention has been made to solve the above-described problems, and when melting snow on a support beam for a road sign, a heat source is not provided inside the support beam, but the outer surface of the support beam is not provided. A supporting beam for a road sign that can be attached to a heat generating member and prevent the heat generated by the heat generating member from being absorbed by the supporting beam while melting or disappearing snow falling or falling on the supporting beam. It aims to provide a snow melting device.

  In order to achieve this object, a snow melting apparatus for a road sign support beam according to claim 1 is attached to the outer surface of the road sign support beam and melts the support beam, and can generate heat when energized. A planar heating member that is a planar body having flexibility, and a base member that is interposed between the planar heating member and the support beam and has heat insulation and electrical insulation; The planar heat generating member is placed on the base member, and is formed into a planar body that is covered by the planar heat generating member, and the surface of the planar body becomes a snow receiving surface capable of snow accumulation, And a snow receiving plate that melts the snow on the snow receiving surface by heating of the planar heat generating member.

  According to the snow melting apparatus for a road sign support beam of claim 1, the base member, the planar heating member and the snow receiving plate are superposed and attached to the outer surface of the road sign support beam. A base member is placed on the outer surface of the support beam, and a planar heating member is placed on the base member, and a snow receiving plate is covered on the planar heating member. The planar heating member generates heat when energized from the power supply device. Heat generated by the planar heat generating member is transferred to the snow receiving plate, but is blocked by the support beam via the base member. The snow falling or accumulating on the snow receiving surface of the snow receiving plate is melted by the heating of the snow receiving plate due to the heat generated by the planar heat generating member.

  The snow-melting device for a road sign support beam according to claim 2 is the snow-melting device for a road beam for road sign according to claim 1, wherein the on-surface heat generating member, the base member, and the snow receiving plate are disposed only on the upper outer surface of the support beam. It is a stacked arrangement.

  According to a third aspect of the present invention, there is provided a snow melting apparatus for a road sign supporting beam according to the first or second aspect, wherein the planar heat generating member, the base member and the snow receiving plate are laminated to have a predetermined length. A snow melting unit is provided as a unit.

  According to the snow melting device for the road sign supporting beam of claim 3, the snow melting unit works in the same manner as the snow melting device for the road sign supporting beam of claim 1 or 2, and the snow melting unit includes a planar heating member and a base. Each planar body of a member and a snow receiving plate is laminated | stacked, and this laminated body becomes a planar body of predetermined length, and is unitized as one member.

  The snow melting apparatus for a road sign support beam according to claim 4 is the snow melting apparatus for a road sign support beam according to claim 3, wherein the snow melting apparatus is arranged and fixed in the longitudinal direction on the outer surface of the road sign support beam. It has a unit.

  According to the snow melting apparatus for a road sign supporting beam of claim 4, the snow melting apparatus for the road sign supporting beam according to claim 3 operates in the same manner, and the outer surface of the road sign supporting beam is supported on the outer surface of the road sign supporting beam. Since the plurality of snow melting units are disposed and fixed substantially uniformly distributed in the longitudinal direction of the beam, it is possible to melt the snow in the entire longitudinal direction of the support beam.

  The snow melting apparatus for a road sign supporting beam according to claim 5 is attached to the outer surface of the road sign supporting beam and melts the snow on the supporting beam. A planar heating member that is a body, and a planar member that is interposed between the planar heating member and the support beam and has heat insulating properties and electrical insulating properties.

  According to the snow melting apparatus for a road sign support beam of claim 5, the base member and the planar heating member are superposed and attached to the outer surface of the road sign support beam. A base member is placed on the outer surface of the support beam, and a planar heating member is placed on the base member. The planar heating member generates heat when energized from the power supply device. The heat generated by the planar heat generating member is blocked to the support beam via the base member. Due to the heat generated by the planar heating member, the snow falling or accumulating on the planar heating member is melted.

  The snow melting apparatus for a road sign support beam according to claim 6 is the snow melting apparatus for a road sign support beam according to claim 5, wherein the on-surface heat generating member and the base member are stacked only on the upper outer surface of the support beam. Is.

  A snow melting apparatus for a road sign support beam according to claim 7 is the snow melting apparatus for a road sign support beam according to claim 5 or 6, wherein the planar heat generating member and the base member are laminated to form a planar shape having a predetermined length. It has a snow melting unit that is unitized as a body.

  According to the snow melting apparatus for the road sign support beam of claim 7, the snow melting unit acts in the same manner as the snow beam melting apparatus for the road sign support beam of claim 5 or 6, and the snow melting unit includes a planar heating member and a base. Each planar body of the member is laminated, and the laminate is unitized as one member by forming a planar body having a predetermined length.

  The snow melting apparatus for a road sign support beam according to claim 8 is the snow melting apparatus for a road sign support beam according to claim 7, wherein the snow melting apparatus is arranged and fixed in the longitudinal direction on the outer surface of the road sign support beam. It has a unit.

  According to the snow melting apparatus for the road sign support beam of the eighth aspect, the snow melting apparatus for the road sign support beam according to the seventh aspect operates in the same manner, and the outer surface of the road sign support beam is supported on the outer surface thereof. Since the plurality of snow melting units are disposed and fixed substantially uniformly distributed in the longitudinal direction of the beam, it is possible to melt the snow in the entire longitudinal direction of the support beam.

  According to the snow melting apparatus for a road sign support beam according to any one of claims 1 to 5, since a heat-insulating base member is interposed between the planar heating member and the supporting beam, the planar heating member The heat loss due to the generated heat absorbed by the support beam can be suppressed, and the heating efficiency of the snow receiving plate by the planar heating member can be improved accordingly, and the snow melting efficiency on the snow receiving surface can be improved. . In addition, the base member not only thermally isolates the planar heat generating member and the support beam, but also electrically insulates, so that the leakage from the planar heat generating member to the support beam can be blocked.

  In addition, this snow melting device is covered with the outer surface of the support beam so that the snow receiving plate itself that snows or accumulates is directly heated by the sheet heating member to melt the snow. Since the portion excluding the installation portion is not heated by the planar heating member, only the snow that has fallen on the snow receiving plate can be efficiently heated and melted away.

  Further, for example, the base member, the planar heat generating member, and the snow receiving plate are attached, and the base member, the planar heat generating member, and the snow receiving plate are laminated and integrated. In this way, it is possible to prevent wastewater, snowmelt water, outside air, etc. from entering between the base member, the surface heat generating member and the snow receiving plate to waste the heat generated by the surface heat generating member. Thus, there is an effect that the snow melting performance by the planar heating member can be improved.

  Further, since the planar heat generating member is covered with the snow receiving plate, it is possible to prevent the planar heat generating member itself from being exposed to rain directly and to suppress damage and deterioration of the planar heat generating member.

  In particular, according to the snow melting apparatus for a road sign support beam according to claim 2, the surface heating member, the base member, and the snow receiving plate are laminated only on the upper outer surface of the support beam. Of these, only the outer surface portion where snow is likely to accumulate can be heated, and the heating range by the planar heating member can be limited to that extent, and the energy consumption of the planar heating member can be reduced.

  Further, according to the snow melting apparatus for a road beam for a road sign of claim 3 in particular, the snow melting unit is formed by uniting a base member, a planar heating member and a snow receiving plate into a predetermined length. There is an effect that it is possible to improve workability when this is retrofitted to the support beam of the road sign. This is because there is no need to separately arrange the base member, the planar heating member and the snow receiving plate on the support beam.

  In particular, according to the snow melting apparatus for a road sign support beam according to claim 4, by arranging and fixing a plurality of snow melting units in the longitudinal direction of the support beam, each individual snow melting unit is short or long. There is an effect that a snow melting function can be provided over the entire range of the support beam.

  The snow-melting device for a road sign support beam according to claims 5 to 8, except for the effect related to the snow receiving plate, the snow-melting device for a road beam for road sign according to any one of claims 1 to 4 The same effect is produced.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the road sign with which the several snow melting unit used for the snow melting apparatus which is one Example of this invention was attached, (a) is a front view of the road sign of a column single beam gate type column type, (B) is a top view of the road sign shown to (a). It is explanatory drawing of another road sign with which the several snow melting unit used for the snow melting apparatus which is one Example of this invention was attached, (a) is a front view of a truss beam portal type road sign, (B) is a top view of the road sign shown to (a). It is the block diagram which showed the electrical structure of the snow melting unit. (A) is a snow melting unit disposed at the tip (anti-power supply device side) position of a plurality of snow melting units, and (b) is a base end (power device side) position of the plurality of snow melting units. Or it is a top view of the snow melting unit arrange | positioned in an intermediate position. (A) is a cross-sectional view of the support beam showing the installation state of the snow melting unit, (b) is an exploded view showing a lamination state of a planar heating sheet using a german heater or a PTC heater as a planar heating element. It is sectional drawing, (c) is the exploded sectional view which showed the laminated structure of the planar heating sheet | seat which used the net-like carbon fiber heat as a planar heating element. It is the block diagram which showed the electric constitution of the control apparatus. It is explanatory drawing about the modification regarding the fixation structure of a snow melting unit, Comprising: It is sectional drawing of the support beam to which the snow melting unit was attached.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 are explanatory views of two types of road signs 50 to which a plurality of snow melting units 2 used in a snow melting device 1 according to an embodiment of the present invention are attached. FIG. FIG. 1B is a front view of a single-beam gate type road sign 50, FIG. 1B is a plan view of the road sign 50 shown in FIG. 1A, and FIG. 2A is a truss beam. FIG. 2B is a front view of a gate-type pillar type road sign 50, and FIG. 2B is a plan view of the road sign 50 shown in FIG.

  The snow melting unit 2 of the snow melting device 1 shown in FIGS. 1 and 2 is an instrument for melting snow that is snowing or accumulating on the support beam 54 of the road sign 50, and the road sign via the binding band 3. It is fixed to 50 support beams 54.

  A road sign 50 shown in FIG. 1 includes a sign board 51 displaying road information (not shown in FIGS. 1 and 2) on one side, and a column single beam gate type that supports the sign board 51 in the air. And a portal column 52 in the form of a column. The portal column 52 includes a pair of support columns 53 and 53 erected on both sides in the width direction of the road, and a single support beam 54 in the shape of a round column (column) installed between the pair of support columns 53 and 53. And.

  The portal column 52 is formed in a front gate type (arch) shape by a pair of support columns 53, 53 and a single support beam 54, and the support beam 54 is connected to a large-diameter round steel pipe. It is formed in the shape of a round column of books. Further, the sign plate 51 is fixed to the support beam 54, and is supported in the air above the road surface of the traveling lane.

  The plurality of snow melting units 2 are all formed in a unit shape having a predetermined length. The plurality of snow melting units 2 are disposed on the upper outer surface of the support beam 54 of the road sign 50 (referred to as the upper portion of the outer peripheral surface; the same applies hereinafter), and in the longitudinal direction of the support beam 54 (the road width direction). The snow melting units 2 and 2 that are arranged alongside each other are present at a predetermined interval from each other.

  The road sign 50 shown in FIG. 2 is obtained by changing the form of the support beam 54 with respect to the road sign 50 shown in FIG. And a portal column 52 in the form of a type.

  The truss beam gate type pillar type column 52 includes a pair of support columns 53 and 53 and a truss beam 55 installed between the pair of support columns 53 and 53. The truss beam 55 includes a plurality of truss beams 55. It is formed by the support beam 54. The plurality of support beams 54 are formed by four main beams 54A extending linearly in the road width direction and a plurality of reinforcing beams 54B connected to the main beam 54A in a bracing manner.

  The plurality of snow melting units 2 are arranged on the upper outer surface of each support beam 54 of the truss beam 55 along the longitudinal direction of the support beam 54. Specifically, among the support beams 54, each main beam 54A has a plurality of snow melting units 2 arranged at predetermined intervals in the longitudinal direction, and each reinforcing beam 54B has one snow melting unit 2 thereof. It is arranged over the entire longitudinal direction.

  In the present embodiment, the road sign 50 using the sign board 51 is illustrated. However, for example, an electric bulletin board may be used instead of the sign board. Examples of the portal-type column type are illustrated, but for example, a support structure having a different form from an F-type column, a T-type column, an inverted L-type (cantilever type) column, a composite column, and other portal-type columns. Also good.

  FIG. 3 is a block diagram showing an electrical configuration of the snow melting unit 2. As shown in FIG. 3, the snow melting device 1 includes a plurality of snow melting units 2 disposed on the upper outer surface of the support beam 54 of the road sign 50, a power supply device 4 that supplies power to the snow melting unit 2, and And a control device 5 that controls the operation of the snow melting unit 2 by adjusting energization by the power supply device 4.

  Each of the snow melting units 2 includes a sheet heating sheet 6 therein, and the sheet heating sheet 6 includes a sheet heating element 6 a that generates heat by energization from the power supply device 4. The planar heating element 6a is a heating element formed in a flexible film shape, sheet shape, or other planar shape.

  The planar heating element 6a includes those having self-temperature controllability and those having no self-temperature controllability. For example, the planar heating element 6a having self-temperature controllability includes a german heater (not shown for violation of public order and morals) and a PTC (abbreviation of Positive Temperature Coefficient) heater. Moreover, there exists a net-like carbon fiber heater as the planar heating element 6a without self-temperature controllability.

  Regardless of the presence or absence of self-temperature controllability, these planar heating elements 6a have simpler temperature control than the planar heating elements 6a using a heating wire such as a general nichrome wire. Each of the planar heating elements 6a is made of a material that is lightweight and easy to process, and can be easily transported and handled at the time of construction, and is deformed and installed in accordance with the cross-sectional shape of the support beam 54. It is also easy to do.

  Next, a germane heater, a PTC heater, and a net-like carbon fiber heater that are the planar heating elements 6a will be described. The load capacity per sheet heating element 6a is, for example, about several tens W (for example, about 20 to 30 W in the case of a german heater), but is not necessarily limited to this value. It may be changed as appropriate.

  A german heater is a heat generating element (conductive film) of a composite conductive material system, and a metal base and a non-metal base conductive material (polymer matrix) formed of a fluororesin such as PTFE (fluorocarbon resin). It is a planar heating element formed by dispersing a conductive filler into a film shape. This german heater can produce heating elements having different resistance values even with the same size by appropriately changing the composition of the conductive filler.

  Further, the german heater has a semiconductor property, has a high temperature rise rate, and can generate heat efficiently with a small amount of electric power. Further, since the german heater is formed in a flexible film shape, it can be easily cut and is not ignited by such cutting. And the power supply used for a german heater can use either direct current or alternating current, and can use the range of 10 to 200 degreeC as the heat_generation | fever temperature.

  It should be noted that germane heaters are difficult to use at temperatures exceeding this because PTFE, the base material, is destroyed at 250 ° C.

  In the german heater, a lead wire is connected to a terminal (for example, a copper foil terminal) provided on the base material and energized (powered) from the power supply device 4, thereby energizing the conductive powder dispersed in the base material. Occurs, and the front and back surfaces of the base material generate heat as a whole.

  This german heater does not perform self-temperature control by increasing the resistance value with an increase in self-temperature like a PTC heater, and the resistance value is constant without fluctuating with a change in self-temperature, While constant power consumption is generated by supplying a constant current, temperature control is performed by thermal equilibrium by self-heat dissipation.

  For example, the german heater has a thickness of 0.14 mm, an insulation withstand voltage of AC 1500 V (60 seconds), and an insulation resistance of 100 MΩ or more (DC 500 V). In addition, the resistance of the german heater can be set in accordance with the composition and dimensions of the raw materials at the time of manufacture. For example, it is possible to manufacture a resistor having a resistance value of several tens of Ω to several hundreds of Ω.

  For example, in the case of a german heater, when the outside air temperature is 20 ° C. and the working voltage is 100 V, Example 1 (resistance value 56Ω, current value 75 mA, power consumption 7.5 W, air radiation temperature 30 ° C.), Example 2 (resistance value 42Ω) , Current value 200 mA, power consumption 20 W, air radiation temperature 45 ° C., Example 3 (resistance value 25 Ω, current value 340 mA, power consumption 34 W, air heat radiation temperature 60 ° C.), Example 4 (resistance value 37 Ω, current value 2700 mA) , Power consumption 270 W, air heat radiation temperature 100 ° C.).

  The PTC heater is a resistance heating element having a film-like base material having a positive resistance temperature coefficient (PTC). A lead wire is connected to a terminal provided on the base material, and power is supplied from the power supply device 4. Thus, energization occurs in the conductive filler dispersed in the base material, and the front and back surfaces of the base material generally generate heat. Since this PTC heater has a low resistance value from the start of energization until it exceeds a predetermined temperature range, the power consumption is suppressed. On the other hand, when the temperature exceeds a predetermined temperature range, the resistance increases rapidly, thereby suppressing the power consumption and increasing the temperature. It is suppressed.

  As the net-like carbon fiber heater, for example, there is a heating element described in JP 2012-243596 A. This net-like carbon fiber heater has a net-like woven fabric knitted into a net-like shape at intervals in the longitudinal and lateral directions with cotton yarn, and the carbon yarn is used as the warp and weft of the net-like fabric. This is an electric heating element in which exothermic yarn is knitted and the exothermic yarn is arranged in a lattice pattern on a net-like fabric.

  In this net-like carbon fiber heater, a plurality of copper wires are adjacently knitted in the warp direction at both ends in the weft direction, and each copper wire is heated at one end in the longitudinal direction of the copper wire. It is electrically connected to the yarn and each weft is electrically connected to each warp that intersects it. In the net-like carbon fiber heater, terminals are provided for each copper wire at both ends of the weft direction, and a current is supplied to each heating yarn by connecting a lead wire to each terminal and supplying power from the power supply device 4. The net-like carbon fiber heater flows and generates heat entirely.

  Heretofore, the planar heating sheet 6 using a germane heater, a PTC heater or a net-like carbon fiber heater has been described as the planar heating element 6a. However, the planar heating element is not necessarily limited to these. For example, a silicon rubber heater (not shown for violation of public order and morals) or other flexible planar heating element may be used.

  The power supply device 4 is a power source for energizing the planar heating element 6a, and either a DC power source or an AC power source is used according to the specifications of the planar heating element 6a. The control device 5 controls the operation of the snow melting device 1 by switching between the energized state and the energized stop state of the planar heating element 6 of the power supply device 4 based on the temperature detected by the outside air temperature sensor 14. The outside air temperature sensor 14 is a sensor that measures the outside air temperature at the place where the road sign 50 is installed.

  FIG. 4A shows a snow melting unit (hereinafter also referred to as a “single connection type snow melting unit”) 201 disposed at the tip (reverse power supply device 4 side) position of the arrangement of the plurality of snow melting units 2. (B) is a plan view of a snow melting unit (hereinafter also referred to as “double-connection type snow melting unit”) 202 disposed at a base end (power supply device 4 side) position or an intermediate position of the arrangement of a plurality of snow melting units 2. is there. FIG. 4 is a plan view of the snow receiving plate 7 removed from the snow melting unit 201.202 and juxtaposed.

  As shown in FIG. 4, each of the one-connection type snow melting unit 201 and the two-connection type snow melting unit 202 has a main body portion 20a having a rectangular shape in plan view. As shown to Fig.4 (a), both the connection type snow-melting units 202 are each connected with the electricity supply cables 20b and 20b at the longitudinal direction both ends of the main-body part 20a.

  The base end portion of each energizing cable 20b is connected to the terminal of the sheet heating element 6a, and the plug 20c is attached to one end of the two energizing cables 20b. A plug receiver 20d is attached to the tip of the.

  As shown in FIG.4 (b), as for the one-connection type snow melting unit 201, the electricity supply cable 20b is connected to the longitudinal direction one end part of the main-body part 20a. A base end portion of the energization cable 20b is connected to a terminal of the planar heating element 6a, and a plug 20c is attached to the tip end portion.

  In the one-connection type snow melting unit 201 and the two-connection type snow melting unit 202, the convex portion of the plug 20c can be fitted into the concave portion of the plug receiver 20d of another snow melting unit 2, and the convex portion and the concave portion Thus, the plug 20c and the plug receiver 20d can be electrically connected.

  For example, when only one snow melting unit 2 is used, each snow melting unit 2 is connected to the power supply device by inserting the plug 20c of the single connection type snow melting unit 201 into an outlet or a plug receptacle (not shown) of the power supply device 4. 4 is connected. When two snow melting units 2 are connected, the plug 20c of the single connection type snow melting unit 201 is connected to the plug receiver 20d of the double connection type snow melting unit 202, and the difference between the two connection type snow melting units 202 is connected. Each snow melting unit 2 is connected to the power supply device 4 by inserting the plug 20c into an outlet (not shown) of the power supply device 4 or a plug receptacle 20d.

  Further, when connecting n (3 or more) snow melting units 2, the plug 20 c of the single connection type snow melting unit 201 is connected to the plug receiver 20 d of the first double connection type snow melting unit 202, The 2nd to n-th double-connection snow melting units 202 are connected in order using the plug 20c and the plug receiver 20d, and the plug 20c of the n-th double-connection snow melting unit 202 is connected to the power supply device 4. Each of the snow melting units 2 is connected to the power supply device 4 by being inserted into an outlet (not shown) or a plug receptacle.

  5A is a cross-sectional view of the support beam 54 showing the installation state of the snow melting unit 2, and FIG. 5B is a planar heating sheet using a german heater or a PTC heater as the planar heating element 6a. 6 is an exploded sectional view showing a laminated state of FIG. 6, and FIG. 5C is an exploded sectional view showing a laminated structure of a sheet heating sheet 6 using net-like carbon fiber heat as the sheet heating element 6a. .

  As shown in FIG. 5 (a), the snow melting unit 2 has an upper outer surface of the support beam 54 of the road sign 50 (in this embodiment, the upper third portion of the support beam 54 (shown in FIG. 5 (a)). The surface heating element 6a is disposed only on the outer peripheral surface of the portion corresponding to the upper third portion when the support beam 54 is divided into three equal parts in the vertical direction. Yes.

  The binding band 3 is wound around the support beam 54 while the snow melting unit 2 is placed, and the snow melting unit 2 can be fixed to the outer surface of the support beam 54 by tightening the binding band 3. . For example, the binding band 3 is a stainless steel pole band with a fastening bracket (not shown for violation of public order and morals), and the snow melting unit 2 can be fastened to the support beam 54 by tightening the band with the fastening bracket.

  Note that the method of fixing the snow melting unit 2 is not necessarily based on the pressure fixing using only the binding band 3, but for example, the snow melting unit 2 is bonded and fixed to the outer surface of the support beam 54, or the snow melting unit 2 is supported. Further, the cable 54 may be bonded and fixed using the binding band 3 while being bonded and fixed to the beam 54.

  As shown in FIG. 5B, the snow melting unit 2 using a germane heater or a PTC heater as the planar heating element 6a mainly includes a snow receiving plate 7, a heat-resistant insulating sheet 8, a planar heating sheet 6, and This is a laminate in which four types of planar bodies called base sheets 9 are laminated in order from the top. Here, the planar body means an object having a film shape, a sheet shape, a thin plate shape, or other planar shapes (the same applies hereinafter).

  Of the above-described planar bodies, the heat-resistant insulating sheet 8, the planar heat generating sheet 6, and the base sheet 9 excluding the snow receiving plate 7 are planar bodies having flexibility (flexibility), and there is a difference between them. It is made of a material having some flexibility. Moreover, although the snow receiving plate 7 is less flexible than other planar bodies, its thickness is thin, so it is easily plastically deformed, and has a workability that can be easily deformed even in a simple processing operation on site.

  As described above, the snow melting unit 2 has a material and a form in which all the planar bodies are easily deformed along the cross-sectional shape of the support beam 54. Therefore, even if the cross-sectional shape is an arc shape like the support beam 54 shown in FIG. 5A, each planar body of the snow melting unit 2 is changed to the arc-shaped cross-section shape of the support beam 54. The snow melting unit 2 can be placed in a state in which the snow melting unit 2 is aligned with the upper outer periphery of the support beam 54.

  The snow receiving plate 7 is a thin plate-like planar body formed of a metal material such as a stainless steel material having corrosion resistance and high thermal conductivity, for example. The snow receiving plate 7 has a snow receiving surface 7 a that receives snow falling on its upper surface, and a heated surface 7 b that is heated by the sheet heating sheet 6 on the back surface.

  Since the snow receiving plate 7 needs to be appropriately processed in accordance with the cross-sectional shape of the support beam 54 of the road sign 50 (such as the diameter of a large diameter round steel pipe), its thickness is thin (for example, about 1 mm). The workability is enhanced by forming the film in the shape. In particular, when the snow melting unit 2 is installed on-site on the support beam 54 of the existing road sign 50, the snow receiving plate 7 is made thinner and lighter, so the handling and processing of the snow receiving plate 7 on the site are compared. This makes it easier to install the snow melting unit 2 quickly.

  In addition, the snow receiving plate 7 is stuck and fixed to the heat-resistant insulating sheet 8 via the double-sided adhesive tape 10. For example, as an example of the double-sided pressure-sensitive adhesive tape 10, there is (not shown for violation of public order and morals). However, the means for fixing the snow receiving plate 7 is not necessarily limited to that using the double-sided pressure-sensitive adhesive tape 10, and in addition to or instead of the means for fixing the double-sided pressure-sensitive adhesive tape 10, the binding band 3 described above is used. The support beam 54 may be tightened and fixed.

  The heat-resistant insulating sheet 8 is an electrical insulating pressure-sensitive adhesive tape in which a rubber-based adhesive is applied and laminated on one side of an acetate cloth having electrical insulation properties and heat resistance. It is affixed on the upper surface of the heat-resistant insulating film 6b. In addition, it is good to use the heat-resistant insulation sheet 8 whose heat-resistant temperature is 130 degreeC comparable as the 1st heat-resistant insulating film 6b.

  The heat-resistant insulating sheet 8 is laminated on the first heat-resistant insulating film 6b in a state where the heat-resistant insulating sheet 8 is attached to the upper surface of the first heat-resistant insulating film 6b of the planar heat-generating sheet 6, and the first heat-resistant insulating film 6b. It covers the entire upper surface.

  The sheet heating sheet 6 is a heating element having a sheet body in which the upper and lower surfaces of the sheet heating element 6a are covered and protected by the first and second heat-resistant insulating films 6b and 6c, and the first and second heat-resistant insulating films 6b. , 6c are films for covering and protecting the planar heating element 6a. The germane heater and the PTC heater used as the planar heating element 6a are as described above.

  The first heat-resistant insulating film 6b is laminated on the planar heating element 6a in a state where it is applied to the upper surface of the planar heating element 6a to cover the entire upper surface of the planar heating element 6a. The first heat-resistant insulating film 6b is, for example, an electrically insulating adhesive tape obtained by applying and laminating an acrylic adhesive on one surface of a polyester film having electrical insulating properties and heat resistance, and the surface is provided through the adhesive surface of the adhesive tape. Attached to the upper surface of the heating element 6a.

  For example, the first heat-resistant insulating film 6b may be (not shown for violation of public order and morals) (total thickness 50 μm, polyester film thickness 25 μm, breakdown voltage 6.0 kV, UL temperature standard 130 ° C.).

  The second heat-resistant insulating film 6c is laminated under the planar heating element 6a in a state where it is applied to the lower surface of the planar heating element 6a to cover the entire lower surface of the planar heating element 6a. The second heat-resistant insulating film 6c is an electrically insulating adhesive tape in which a heat-resistant silicone adhesive is applied and laminated on one surface of a polyimide film having electrical insulation and heat resistance, and a planar heating element is interposed through the adhesive surface. It is stuck on the lower surface of 6a.

  For example, the second heat-resistant insulating film 6c may be (not shown for violation of public order and morals) (total thickness 50 μm, polyimide film thickness 25 μm, breakdown voltage 7.0 kV, UL temperature standard 200 ° C.).

  The base sheet 9 is placed in contact with the upper outer periphery of the support beam 54 of the road sign 50, and has heat insulation, electrical insulation and non-water absorption. The base sheet 9 is interposed between the planar heat generating sheet 6 and the support beam 54, and is in contact with the entire lower surface of the second heat-resistant insulating film 6 c of the planar heat generating sheet 6. It is laid in the state laminated | stacked under the heat-resistant insulating film 6c.

  For example, the base sheet 9 is a rubber sheet using EP (ethylene propylene) rubber, and has excellent heat insulation properties because of its electrical insulation and low thermal conductivity. For example, the thickness of this base sheet 9 is about 2 mm.

  Note that the base sheet 9 may be placed only on the upper outer surface of the support beam 54. For example, the base sheet 9 may be attached to the upper outer surface of the support beam 54 via an adhesive (including an adhesive). good. In addition, the base sheet 9 may simply have the second heat-resistant insulating film 6c placed on the upper surface thereof. For example, the base sheet 9 is attached to the lower surface of the second heat-resistant insulating film 6c via an adhesive. You may make it do.

  As shown in FIG. 5C, the snow melting unit 2 using a net-like carbon fiber heater as the planar heating element 6a is mainly composed of a snow receiving plate 7, a planar heating sheet 6, and a base sheet 9. It is a laminated body in which kinds of planar bodies are laminated in order from the top. Here, since the snow receiving plate 7 and the base sheet 9 are the same as those described above, the description thereof will be omitted.

  The sheet heating sheet 6 using a net-like carbon fiber heater as the sheet heating element 6a is a heating element having a sheet body in which the upper and lower surfaces of the sheet heating element 6a are covered and protected by heat resistant insulating films 6d and 6d. The heat-resistant insulating films 6d and 6d are films for covering and protecting the planar heating element 6a. The net-like carbon fiber heater that becomes the planar heating element 6a is as already described.

  In the sheet heating sheet 6, heat-resistant insulating films 6d and 6d are laminated on the top and bottom of the sheet heating element 6a, respectively, and the two upper and lower heat-resistant insulating films 6d and 6d are formed on the upper and lower surfaces of the sheet heating element 6a. The sheet-like heating element 6a is sandwiched from above and below by being attached to both surfaces. The upper and lower heat-resistant insulating films 6d and 6d cover the entire upper surface and lower surface of the planar heating element 6a.

  These heat-resistant insulating films 6d and 6d are, for example, polyethylene naphthalate films having resistance to deterioration and deterioration due to ultraviolet rays, electrical insulation and heat resistance, and an upper surface of the planar heating element 6a via an adhesive. Affixed to the lower surface. For example, as the heat-resistant insulating films 6d and 6d, a biaxially stretched PEN (polyethylene naphthalate) film (Teonex (registered trademark)) manufactured by Teijin DuPont Films may be used.

  FIG. 6 is a block diagram showing an electrical configuration of the control device 5. As shown in FIG. 6, the control device 5 includes a microcomputer 11 and a switching circuit 15. The microcomputer 11 is equipped with a CPU 12 that performs arithmetic processing and a memory 13 that stores a set temperature. The switching circuit 15 opens and closes an energization path that connects the power supply device 4 and the planar heating element 6 a based on a command signal from the microcomputer 11.

  The memory 13 of the microcomputer 11 is a storage device that stores a set temperature (energization start temperature) for starting energization from the power supply device 4 to the planar heating element 6a and a set temperature (energization stop temperature) for stopping the energization. is there. The energization start temperature and the energization stop temperature stored in the memory 13 can be arbitrarily set and changed according to the weather conditions of the place where the snow melting device 1 is installed, the power supply situation, and the like. The setting change of the energization start temperature and the energization stop temperature is performed via an operating device (not shown) connected to the microcomputer 11.

  For example, in this embodiment, the energization start temperature is set to 4 ° C. and the energization stop temperature is set to 6 ° C. in the memory 13.

  According to this control device 5, when the temperature detected by the outside air temperature sensor 14 falls below 4 ° C., a command signal is input from the microcomputer 11 to the switching circuit 15, and the switching circuit 15 is closed (ON) by this input. By this closing, the energization path between the power supply device 4 and the planar heating element 6a is connected, and energization from the power supply device 4 to the planar heating element 6a is started.

  As a result, it is generally easy for snowfall to occur at a temperature of 2 ° C. However, since the planar heating element 6a can be preheated before the temperature drops to 2 ° C. or lower, for example, the temperature becomes 2 ° C. or lower. The heating temperature of the planar heating element 6a when the temperature falls below 2 ° C. can be increased compared with the case where the energization to the planar heating element 6a is started after that, and the snow melting performance is improved accordingly. it can.

  On the other hand, according to the control device 5, when the temperature detected by the outside air temperature sensor 14 becomes 2 ° C. or less and then becomes 6 ° C. or more, a command signal is input from the microcomputer 11 to the switching circuit 15, The switching circuit 15 is opened (turned off) by the input, and the energization path between the power supply device 4 and the planar heating element 6a is cut by this opening, and the energization of the planar heating element 6a from the power supply device 4 is stopped.

  Since the energization stop temperature (for example, 6 ° C.) is set higher than the energization start temperature (for example, 4 ° C.) in this way, after the energization to the planar heating element 6a is started, the air temperature is higher than the energization start temperature. Even if the temperature rises, if the temperature is lower than the energization stop temperature, the energized state of the planar heating element 6a can be maintained as it is. For this reason, it is possible to prevent the switching circuit 15 from being frequently turned on and off in a situation where the temperature changes slightly near the energization start temperature.

  The energization stop temperature described above is not necessarily limited to 6 ° C. For example, snow and hail may fall even at an air temperature of 10 ° C or less. You may make it set in the range below 10 degreeC.

  FIG. 7 is an explanatory view of a modified example related to the fixing structure of the snow melting unit 30 and is a sectional view of the support beam 54 to which the snow melting unit 2 is attached.

  As shown in FIG. 7, the snow melting unit 30 includes the above-described snow receiving plate 7 and a cylindrical wound sheet 31 containing the planar heating element 6a. The cylindrical winding sheet 31 is wound around the outer periphery of the support beam 54 to form a cylindrical body. The cylindrical wound sheet 31 has a seam at the lower end of the outer periphery of the support beam 54 in a state of being wound around the outer periphery of the support beam 54, and this seam is joined and connected by the joining tool 32.

  The joining tool 32 connects the joint of the cylindrical wound sheet 31 so as to be freely connected and disconnected, and for example, a hook-and-loop fastener is used. In addition, the joining tool 32 is not necessarily limited to a hook-and-loop fastener, For example, various buttons, such as a fastener and a snap button, and other fasteners may be sufficient.

  The cylindrical wound sheet 31 is a laminate of the above-described heat-resistant insulating sheet 8, the sheet heating sheet 6, and the base sheet 9, and the sheet heating element 6 a is supported by the sheet heating sheet 6. It is disposed only in a range corresponding to the upper outer surface of the beam 54. Further, the snow receiving plate 7 is covered in the arrangement range of the planar heating element 6 a in the cylindrical winding sheet 31.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, some modifications of the control device 5 will be described below. First, the control device 5 detects the surface temperature of the planar heating element 6a with another temperature sensor other than the outside air temperature sensor 14, opens and closes the switching circuit 15 based on the value of the surface temperature, and the planar heating element 6a. The surface heating element 6a may be turned on / off so that the surface temperature of the sheet becomes a constant value or a value within a certain range.

  Further, the control device 5 calculates the temperature decrease rate from the temperature detected by the outside air temperature sensor 14 by the CPU 12 of the microcomputer 11 and starts energization according to the temperature change rate, the energization start time, the energization time, the energization amount, etc. It may be one that adjusts. Moreover, the control apparatus 5 may detect snowfall with a snowfall sensor.

  In addition, in order to complement the snowfall detection using the snowfall sensor, or instead of the snowfall detection by the snowfall sensor, the control device 5 detects the presence or absence of rain before the snowfall by the precipitation detection sensor, and this and the outside air temperature. By determining together with the detection result of the outside air temperature (environment temperature) by the sensor 14, it may be determined whether or not the weather condition is in a state where snowfall is possible.

  Further, the control device 5 may take an image of an installation location of the road sign 50 by an image sensor and determine the presence or absence of snow by analyzing the taken image. Further, the control device 5 may reduce power consumption by temporarily stopping energization of the planar heating element 6a after a lapse of a certain time after starting energization of the planar heating element 6a. . Furthermore, the control device 5 may use a sequence control that is linked to the operation of another device.

  By the way, in each said Example, when using a germane heater and a PTC heater, the snow-melting unit 2 is formed by laminating the snow receiving plate 7, the heat-resistant insulating sheet 8, the sheet heating sheet 6 and the base sheet 9 in this order. In the case of using a carbon fiber heater, the snow-melting unit 2 was formed by laminating the snow receiving plate 7, the sheet heating sheet 6 and the base sheet 9 in this order.

  However, the lamination form of each planar body of the snow melting unit 2 is not necessarily limited to this, and the snow receiving plate 7 and the heat-resistant insulating sheet 8 laminated on the planar heating sheet 6 may be unnecessary. .

DESCRIPTION OF SYMBOLS 1 Snow melting apparatus 2 Snow melting unit 6 Planar heat generating sheet (planar heat generating member)
7 Snow receiving plate 7a Snow receiving surface 9 Base sheet (base member)
50 Road sign 54 Support beam

The snow melting apparatus for a road sign support beam according to claim 2 is the snow melting apparatus for a road sign support beam according to claim 1, wherein the planar heat generating member, the base member, and the snow receiving plate are provided only on the upper outer surface of the support beam. It is a stacked arrangement.

The snow melting apparatus for a road sign support beam according to claim 6 is the snow melting apparatus for a road sign support beam according to claim 5, wherein the planar heat generating member and the base member are stacked only on the upper outer surface of the support beam. Is.

In particular, according to the snow melting apparatus for a road beam for a road sign according to claim 2, the planar heating member, the base member, and the snow receiving plate are laminated only on the upper outer surface of the support beam. Of these, only the outer surface portion where snow is likely to accumulate can be heated, and the heating range by the planar heating member can be limited to that extent, and the energy consumption of the planar heating member can be reduced.

The planar heating element 6a includes those having self-temperature controllability and those having no self-temperature controllability. For example, a planar heating element 6a to one having a self-temperature control properties, it is a heater (short for PioesuaitiiveTemperatureCoefficient) Gerumahi data or PTC. Moreover, there exists a net-like carbon fiber heater as the planar heating element 6a without self-temperature controllability.

Heretofore, the planar heating sheet 6 using a germane heater, a PTC heater or a net-like carbon fiber heater has been described as the planar heating element 6a. However, the planar heating element is not necessarily limited to these. rather than translation, for example, it may be a planar heating element with other flexible silicone rubber heater So.

The binding band 3 is wound around the support beam 54 while the snow melting unit 2 is placed, and the snow melting unit 2 can be fixed to the outer surface of the support beam 54 by tightening the binding band 3. . For example, binding band 3 is made of stainless steel Poruban de with fastening brackets can be fastened snow melting unit 2 by cinching the band to the support beam 54 by fastening brackets.

In addition, the snow receiving plate 7 is stuck and fixed to the heat-resistant insulating sheet 8 via the double-sided adhesive tape 10. For example, as an example of the double-sided adhesive tape 10, there are two aspects adhesive tape distinct types. However, the means for fixing the snow receiving plate 7 is not necessarily limited to that using the double-sided pressure-sensitive adhesive tape 10, and in addition to or instead of the means for fixing the double-sided pressure-sensitive adhesive tape 10, the binding band 3 described above is used. The support beam 54 may be tightened and fixed.

For example, it may first heat-resistant insulating film 6b is Po Li ester film adhesive tape Using (total thickness 50 [mu] m, a polyester film thickness 25 [mu] m, the breakdown voltage 6.0 kV, UL temperature rating 130 ° C.).

For example, it the second heat-resistant insulating film 6c is Po Li imide film adhesive tape Using (total thickness 50 [mu] m, a polyimide film thickness 25 [mu] m, the breakdown voltage 7.0 kV, UL temperature rating 200 ° C.).

Claims (8)

In the snow melting device attached to the outer surface of the support beam of the road sign and melting the snow of the support beam,
A planar heating member that is a flexible planar body that can generate heat when energized;
A planar member that is interposed between the planar heating member and the support beam and has heat insulation and electrical insulation;
The surface heat generating member is formed on a surface of the base member so as to be covered with the surface heat generating member. A snow melting device for a road beam for a road sign, comprising: a snow receiving plate for melting snow on the snow receiving surface by heating due to heat generated by the heat generating member.   The snow melting apparatus for a support beam for a road sign according to claim 1, wherein the on-surface heat generating member, the base member, and the snow receiving plate are laminated on only the upper outer surface of the support beam.   The road sign support according to claim 1 or 2, further comprising a snow melting unit in which the planar heat generating member, the base member, and a snow receiving plate are laminated to form a unit having a predetermined length. Snow melting device for beams.   4. The snow melting apparatus for a road sign support beam according to claim 3, further comprising a plurality of the snow melting units arranged and fixed in a longitudinal direction on an outer surface of the road sign support beam. In the snow melting device attached to the outer surface of the support beam of the road sign and melting the snow of the support beam,
A planar heating member that is a flexible planar body that can generate heat when energized;
A support beam for a road sign, comprising: a planar member interposed between the planar heating member and the support beam, the base member having heat insulation and electrical insulation. Snow melting equipment.   6. The snow melting apparatus for a support beam for road signs according to claim 5, wherein the on-surface heat generating member and the base member are laminated only on the upper outer surface of the support beam.   The road sign support according to claim 5 or 6, further comprising a snow melting unit in which the planar heat generating member, the base member, and a snow receiving plate are laminated to form a unit having a predetermined length. Snow melting device for beams.   8. The snow melting apparatus for a road sign supporting beam according to claim 7, further comprising a plurality of said snow melting units arranged and fixed in a longitudinal direction on an outer surface of the road sign supporting beam.

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