JP6170761B2 - Snow melting block, visually impaired person guidance block and road snow melting structure using the same - Google Patents

Description

  The present invention relates to a snow melting block, a visually impaired person guiding block, and a road snow melting structure using the same.

  In snowfall areas, snow melting blocks are often installed on sidewalks and station platforms to avoid walking obstacles due to snow accumulation. In addition, in order to assist the visually impaired's walking, a block for guiding the visually impaired with a certain uneven pattern on the surface is installed. A panel is pasted to make a visually impaired person guidance block. One example is described in Patent Document 1, in which a thick concrete block is formed as a base material, and an electric heater wire is arranged as a heat source in the block to obtain heat for melting snow, and concrete. By mixing 0.5 to 3% by weight of carbon powder or chips in the block, the heat conduction efficiency is improved. Patent Document 2 describes a visually impaired person guidance block in which an uneven panel is pasted on snow melting means (base block) equipped with an electric heater.

JP 2002-242118 A Registered Utility Model Publication No. 3164265

  A conventional snow melting block has a configuration in which an electric heater as a heat source is integrally arranged in a base material block. When a plurality of snow melting blocks are continuously arranged, it is necessary to connect them one by one. Therefore, installation work requires labor and careful work is required so as not to cause disconnection or separation at the connection part. In addition, since the electric heater is nearby, carbon powder or chips with low conductivity are mixed as a material for improving the heat conduction efficiency in the base block, but carbon is basically flammable. Yes, there is a risk of burning and deterioration when sunlight condenses.

  The present invention has been made in view of the above circumstances, and even if it has a high heat conduction efficiency and becomes a high temperature state for some reason, the heat conduction efficiency does not decrease due to deterioration. An object is to provide a snow melting block. Another object of the present invention is to provide a visually impaired person guiding block using the snow melting block. It is another object of the present invention to provide a road snow melting structure including these snow melting blocks or visually impaired person guiding blocks.

  A snow melting block according to the present invention is a snow melting block embedded in a roadbed, and includes a plate-like base material made of a cement-based material and a heat transfer material made of a metal material or a ceramic material embedded in the plate-like base material. It is characterized by being configured.

  The snow melting block according to the present invention uses a metal material or ceramic material having a higher thermal conductivity than the cement-based material as a heat transfer material, so that a high heat conduction efficiency can be obtained as a whole. Further, the snow melting block according to the present invention itself does not include an electric heater as a heat source, and therefore, even if a highly conductive metal material or ceramic material is used as the heat transfer material, no short circuit failure occurs. Metal materials and ceramic materials are more stable at high temperatures than carbon powder or chips, and there is no risk of thermal degradation or the like. Therefore, the function as a snow melting block can be maintained over a long period of time.

  The snow melting block according to the present invention can be used as it is embedded in a roadbed such as a sidewalk when used in a place where the geothermal temperature is high. The geothermal heat is conducted to the surface side of the snow melting block using the heat conductive material embedded in the plate-like base material as a heat transfer material, and easily melts snow falling on the surface.

  In places where high geothermal temperatures cannot be obtained, long tape-shaped electric heaters are embedded in the roadbed over a necessary distance, and snow melting blocks are arranged in a row so that the back surface is in contact therewith. In this embodiment, the heat generated from the long tape-shaped electric heater is conducted to the surface side of the snow melting block using the heat transfer material embedded in the plate-like substrate as the heat transfer material, and the snow on the block surface is removed. It dissolves reliably. By using a long tape-shaped electric heater, it is not necessary to connect snow melting blocks each equipped with an electric heater one by one, and the risk of disconnection or short circuit is greatly reduced.

  In the snow melting block according to the present invention, the heat transfer material may be a powder or chip-like metal material or ceramic material. Preferably, the heat transfer material is a plate-like body, and one or more of the plate-like heat transfer materials are arranged vertically in the thickness direction of the plate-like base material. In this aspect, compared with the case where a metal material or ceramic material powder or chip is embedded in a plate-like base material made of a cement-based material, the efficiency and stability from the back surface to the surface of the snow melting block are high. A heat transfer path is formed. Therefore, it is possible to provide a snow melting block having high snow melting efficiency.

  In one aspect of the snow melting block using a plate-shaped heat transfer material, two or more of the plate-shaped heat transfer materials are arranged at intervals in one direction. It is preferable that the arrangement intervals are all equal from the viewpoint of the uniformity of the heat distribution, but the intended purpose can be achieved even if they are different.

  In another aspect of the snow melting block using a plate-shaped heat transfer material, two or more of the plate-shaped heat transfer materials are arranged so as to intersect each other. In this aspect, it is possible to obtain a more uniform temperature distribution in the surface direction as compared to the aspect in which the gaps are arranged in one direction. The crossing angle of the plate heat transfer material is preferably 90 degrees, but is not limited thereto.

  In the snow melting block using the plate-shaped heat transfer material, it is a more preferable aspect that the plate-shaped heat transfer material has one or more through holes. By having the through hole, the cementitious material located on both sides of the plate-like heat transfer material can be continuous through the through hole, and high structural stability can be obtained. When the area of the through hole is increased, the structural stability is further increased, but the area of the heat transfer path is partially reduced and the heat transfer efficiency is lowered. Of the two or more embedded plate-shaped heat transfer materials, which plate-shaped heat transfer material is provided with a through-hole, provided for all plate-shaped heat transfer materials, or for some plate-shaped heat transfer materials The total area of the through-holes should be set appropriately in consideration of the road environment and the natural environment where the snow-melting block is actually embedded, and through experiments and the like. That's fine.

  In one aspect of the snow melting block according to the present invention, the plate-like heat transfer material is arranged in a state where both or one of the upper and lower end faces are exposed. Since the end face is exposed, high heat receiving efficiency on the lower surface side or high heat dissipation efficiency on the upper surface side can be obtained. Of course, the plate-like heat transfer material can receive and dissipate heat through the cement-based material, even if either or both of the upper and lower end surfaces are covered with the cement-based material constituting the plate-like substrate. When the thickness of the coating is thin, the intended purpose can be sufficiently achieved. Furthermore, a second heat transfer material that spreads in the surface direction may be disposed on all or part of the lower surface and / or upper surface of the snow melting block so that the plate-shaped heat transfer material is in contact with the upper and lower end surfaces. In this case, the second heat transfer material may be the same material as the plate heat transfer material, or may be a different material. In this aspect, since a wider heat receiving area or heat radiating area can be obtained, the snow melting efficiency is further improved.

  The present invention further relates to a visually impaired person guidance block embedded in a roadbed, characterized by comprising any of the above-mentioned snow melting blocks and an uneven panel laminated on the upper surface side thereof. A guidance block is also disclosed. As described above, since the snow melting block according to the present invention has high heat transfer efficiency, a sufficient amount of heat necessary for snow melting is reliably transferred to the uneven panel laminated on the upper surface side. Therefore, it is possible to reliably avoid a situation in which snow accumulates on the visually impaired person guidance block and erases the unevenness.

  The present invention further includes a long tape-shaped electric heater laid on the roadbed, and any one of the above-described snow melting arrangements arranged in a row so that the back surface is in contact with the long tape-shaped electric heater. Also disclosed is a road snow melting structure composed of a block for use with a vehicle or a block for guiding the visually impaired. In this road snow melting structure, in the construction, a long tape-shaped electric heater may be laid in the recessed groove of the excavated roadbed, and a snow melting block or a visually impaired person guidance block may be placed on the long tape-shaped electric heater, Since it is not necessary to electrically connect the snow melting blocks or the visually impaired person guiding blocks as in the prior art, construction efficiency is greatly improved. In addition, it is possible to reliably avoid electrical inconvenience (disconnection, short circuit, etc.) after construction.

  In the present invention, the term “cement-based material” constituting the plate-like substrate is used to include all cement-based materials used when producing conventional cement-based blocks, and includes cement, concrete and Mortar and the like are included. Examples of the metal material constituting the heat transfer material include gold, silver, copper, iron, stainless steel, tungsten, and aluminum. From the viewpoint of cost, iron and aluminum are particularly preferable materials. Examples of the ceramic material include silicon carbide, silicon nitride, and aluminum nitride having high thermal conductivity.

  In the present invention, the ratio of the cement-based material constituting the plate-like substrate and the metal material or ceramic material constituting the heat transfer material is arbitrary, but it is necessary that the plate-like substrate can ensure the strength required for the substrate. Considering this, it is appropriate that the volume ratio of the metal material or ceramic material to the cement-based material is 5 to 50% by volume.

  According to the present invention, a snow melting block that has high heat conduction efficiency, does not deteriorate due to deterioration, and is easy to manufacture and implement, and a visually impaired person guidance block using the snow melting block Is obtained. Further, a road snow melting structure including those snow melting blocks or visually impaired person guiding blocks can be obtained.

The perspective view explaining one Embodiment of the block for snow melting by this invention. The perspective view explaining an example of the plate-shaped heat transfer material used with the block for snow melting shown in FIG. The perspective view (FIG.3 (a)) explaining other embodiment of the block for snow melting by this invention and the perspective view (FIG.3 (b)) explaining an example of the plate-shaped heat-transfer material used there. FIG. 2 is two views showing a block for guiding a visually impaired person according to the present invention. The figure explaining one Embodiment of the road snow melting structure by this invention. Sectional drawing of the road snow-melting structure demonstrated in FIG. The figure explaining an example of the elongate tape-shaped electric heater used with the road snow melting structure by this invention. The perspective view (FIG.8 (a)) explaining other embodiment of the block for snow melting by this invention and the perspective view (FIG.8 (b)) explaining the plate-shaped heat-transfer material used there. The graph which shows the temperature change in an Example product and a comparative example product.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are diagrams for explaining an embodiment of a snow melting block according to the present invention. In FIG. 1, FIG. 1 (a) shows a snow melting block A1, and FIG. 1 (b) shows a snow melting block. The uneven | corrugated panel 20 (20a) for visually impaired guidance used with the block A1 is shown.

  First, the snow melting block A1 will be described. The snow melting block A1 is basically composed of a plate-like substrate 1 made of a cement-based material and a heat transfer material made of a metal material or a ceramic material embedded in the plate-like substrate 1. In the illustrated example, the snow melting block A1 has a cubic shape of 300 mm in length, 300 mm in width, and 50 mm in thickness as a whole, and the cement material constituting the plate-like substrate 1 has a weight ratio of cement: sand 1 A mortar mixed with 1 is used. As the heat transfer material, a plate-like heat transfer material 10 is used. In this example, the plate-like heat transfer material 10 is an aluminum plate having a length of 300 mm, a height of 50 mm, and a thickness of 4 mm. .

  As shown in FIG. 2, the plate-shaped heat transfer material 10 has five concave grooves 11 formed at equal intervals in the length direction. The concave groove 11 has a half depth in the height direction of the plate-shaped heat transfer material 10. Further, a through hole 13 having a diameter of 5 mm is formed in a region defined by both end portions 12 in the longitudinal direction and the concave groove 11 and in a central portion of the region defined by the adjacent concave grooves 11, 11. .

  In manufacturing the snow melting block A1, a bottomed formwork (not shown) having a length of 300 mm, a width of 300 mm, and a thickness of 50 mm is used. First, the plate-shaped heat transfer material 10 (10a) is placed in the formwork. ) Are arranged in a vertical orientation parallel to each other at a distance between the concave grooves 11 and 11, with the opening side of the concave groove 11 facing upward. Next, the plate-shaped heat transfer material 10 (10b) in which the opening side of the groove 11 is directed downward is applied to the groove 11 of the plate-shaped heat transfer material 10a that is already disposed. Drop from top to bottom in an upright position, engaging each other. As a result, a combined plate-shaped heat transfer material 10c in which five plate-like and five plate-like heat transfer materials 10a, 10b intersect each other in a lattice form at 90 degrees vertically and horizontally is formed in the mold.

  Thereafter, a mortar mixed with cement: sand: water at a weight ratio of 1: 1: 1 is poured into the mold, and after curing for a predetermined period of time, the mold is removed and the book having the shape shown in FIG. A snow melting block A1 according to the invention is obtained. In the snow melting block A1, the upper and lower end faces of the plate-shaped heat transfer materials 10a and 10b intersecting in a lattice shape are exposed as they are. The mortar thus placed is divided into 36 pieces by the plate-like heat transfer material 10 intersecting in a lattice shape. However, each plate-shaped heat transfer material 10 has, as described above, a region defined by both ends 12 in the longitudinal direction and the groove 11 and a region defined by the adjacent grooves 11, 11. Since the through-hole 13 is formed in the central part, adjacent divided mortars are connected to each other through the through-hole 13, and structural stability is obtained. In this form of snow melting block A1, each of the plate-like heat transfer materials 10a, 10b and the plate-like base material 1 are three-dimensionally continuous, that is, in the xyz direction, and form a so-called 3-3 bond.

  The snow melting block A1 shown in FIG. 1A is used as it is as a snow melting block on a sidewalk or an outdoor platform. Further, the uneven panel 20a for guiding the visually impaired person shown in FIG. 1 (b) is laminated and integrated on the upper surface using an adhesive or the like, thereby guiding the visually impaired person as shown in FIG. 4 (a). Also used as a block B1. The uneven panel 20a shown in FIG. 1B is an example of a guide panel. For example, a dot-like protrusion 22 is integrally formed on the surface of a main body portion 21 made of rubber. FIG. 4 (b) shows another form of visually impaired person guiding block B2, which is replaced with a dot-like projection 22 on the upper surface of the snow melting block A1 shown in FIG. 1 (a). A concave / convex panel 20b integrally formed with a linear protrusion 23 is laminated and integrated. In addition, these uneven | corrugated panels 20a and 20b are already known, and can use a commercially available thing as it is.

  FIG. 3 shows another embodiment of the snow melting block according to the present invention. This snow melting block A2 is different from the snow melting block A1 shown in FIGS. 1 and 2 in the shape of the plate-shaped heat transfer material 10 and its arrangement. The plate-like substrate 1 is the same. As shown in FIG. 3B, the plate-shaped heat transfer material 10 used here is made of an aluminum plate having a length of 300 mm, a height of 50 mm, and a thickness of 4 mm, and the through holes 13 are formed at equal intervals. 2 is the same as that shown in FIG. 2, but is different from the plate-like heat transfer material 10 shown in FIG. 3 in that the groove 11 is not formed.

  When manufacturing the snow melting block A2, as in the case of the snow melting block A1, a mold is prepared, and five plate-shaped heat transfer materials 10 are arranged in the mold at equal intervals and in parallel to each other. Place it vertically. Thereafter, the mortar is poured into the mold in the same manner as in the case of the snow melting block A1, and after curing for a predetermined period, the snow melting block A2 according to the present invention having the shape shown in FIG. Is obtained.

  Also in the snow melting block A2, the upper and lower end surfaces of the plate-shaped heat transfer material 10 are exposed as they are. In addition, the mortar placed is divided into six pieces by the plate-shaped heat transfer material 10 arranged in parallel to each other, but each plate-shaped heat transfer material 10 has through holes 13, so Also in the block A2, the adjacent divided mortars are connected to each other through the through holes 13, and structural stability is also obtained. In the snow melting block A2 of this form, the plate-like heat transfer material 10 is two-dimensional, that is, continuous in the yz direction, and each plate-like heat transfer material 10 has through holes 13 in the plate-like substrate 1. Therefore, it is continuous in three dimensions, that is, in the xyz direction, and forms a so-called 2-3 bond.

  The snow melting block A2 shown in FIG. 3A can also be used as it is as a snow melting block on a sidewalk or an outdoor platform. Furthermore, a visually-impaired person guide concave / convex panel 20 having an appropriate form as shown in FIGS. 4A and 4B is laminated and integrated on the upper surface using an adhesive or the like to guide the visually-impaired person. The block B can be used.

  Although not shown, in the snow melting blocks A1 and A2 shown in FIGS. 1 and 3, a part or all of the through holes 13 formed in the plate-like heat transfer material 10 can be omitted. For example, in the snow melting block A2 shown in FIG. 3, all of the through holes 13 formed in the plate-like heat transfer material 10 can be omitted, that is, eliminated. In this case, the plate-shaped heat transfer material 10 is two-dimensional, ie, continuous in the yz direction, and the plate-like substrate 1 is also two-dimensional, ie, continuous in the yz direction, forming a so-called 2-2 bond. In this aspect, since the plate-shaped heat transfer material 10 does not include the through holes 13 that partially reduce the cross-sectional area of the heat transfer path, there is an advantage that the heat transfer efficiency from the lower surface to the upper surface does not decrease.

  Further, in the snow melting block A1 shown in FIG. 1, when the through holes 13 are removed from all of the plate-like heat transfer material 10, the plate-like heat transfer material 10 is continuous in three dimensions, that is, in the xyz direction. However, the plate-like substrate 1 is only continuous in the z direction, and forms a so-called 3-1 bond. Even in this aspect, the plate-shaped heat transfer material 10 does not include the through holes 13 that partially reduce the area of the heat transfer path, and thus there is an advantage that the heat transfer efficiency is not lowered.

  In the snow melting block A1 shown in FIG. 1, the through holes 13 may be removed from the plate-like heat transfer materials 10a arranged in the x direction. In this case, the plate-shaped heat transfer material 10 is three-dimensional, i.e., continuous in the xyz direction, and the plate-shaped substrate 1 is continuous in the xz direction so as to form a so-called 3-2 bond. become. In this aspect, the plate-shaped heat transfer material 10 can suppress a decrease in heat transfer efficiency by reducing the number of the through holes 13 that partially reduce the cross-sectional area of the heat transfer path, and the plate-shaped substrate. Since 1 is continuous in the x direction, structural stability can be obtained.

  As described above, the plate-like base material 1 and the plate-like heat transfer material 10 have many other bonds depending on the arrangement form of the plate-like heat transfer material 10 and whether or not the through holes 13 are provided there. Aspects can be taken. Of the two or more plate-like heat transfer materials 10 embedded, the plate-like heat transfer material 10 is provided with the through-hole 13, provided for all of the plate-like heat transfer materials 10, or part of the plate-like heat transfer materials 10 Whether it is provided for the heat transfer material 10 and the total area of the through holes 13 is determined in consideration of the road environment and the natural environment in which the snow melting block A is actually embedded, or in an experiment. Etc. and set as appropriate.

  Next, referring to FIG. 5 and FIG. 6, the road snow melting structure C according to the present invention is shown in FIG. 5 and FIG. The case where it installs in is demonstrated as an example. First, a groove having a predetermined width (300 mm or more in this example) and a predetermined depth (about 60 mm in this example) is excavated to a place where the road snow melting structure C is to be installed to a required length. If necessary, foundation work is applied to the bottom of the excavated groove to create a flat surface. Then, a long tape-shaped electric heater D as shown in FIG. 7 is laid on the flat bottom surface of the groove.

  In the example shown in FIGS. 5 and 6, two tape-shaped electric heaters D having a width of 150 mm are laid in parallel. On the long tape-shaped electric heater D that has been laid, the necessary number of the visually impaired person guiding blocks B2 are continuously arranged with the concavo-convex panel 20b side as the upper surface side. At that time, the periphery is backfilled so that the linear protrusions 23 of the uneven panel 20b protrude from the road surface. Finally, by performing an energization process on the tape-shaped electric heater D, the road snow melting structure C is completed. In this aspect, the road snow melting structure C is a snow melting structure including the visually impaired person guiding block B2.

  By energizing the long tape-shaped electric heater D, the heater D generates heat. The heat is transferred to the visually impaired person guiding block B2. The heat transfer proceeds from the lower end surface toward the upper end surface via the plate-shaped heat transfer material 10 (10c) embedded in the plate-like base material 1 of the snow melting block A1. Heat is further transferred from the upper end surface of the plate-shaped heat transfer material 10 to the uneven panel 20b, whereby the uneven panel 20b is heated. And the snow which falls with the heat | fever does not accumulate on the uneven | corrugated panel 20b, but fuse | melts immediately and becomes water.

  Although not shown, when the ground has the required geothermal heat, the visually impaired person guidance block B (B1, B2) is not changed in the excavation groove without laying the tape-shaped electric heater D in the excavation groove. You may make it arrange | position to. Since the underground heat is transmitted to the concavo-convex panel 20 via the plate-shaped heat transfer material 10 (10c), snowfall on the concavo-convex panel 20b can be reliably melted.

  FIG. 7 shows an example of a long tape-shaped electric heater D that can be used in the present invention. A plurality of heating elements 51 made of ceramics, which are rectangular plate-like positive temperature coefficient thermistors, are enclosed in a belt-like heater body 50 at a predetermined interval. Each heating element 51 is formed with a metal terminal 52, and is connected to a power supply line 53 via the metal terminal 52. An electric supply cord 54 for connecting to an external power source is connected to one end portion of each power supply line 53 by soldering, and the metal terminal 52 and the heat generation are connected from the electric supply cord 54 via each power supply line 53. Electric power is supplied to the body 51. The tape-shaped electric heater D having this structure is described in Japanese Patent Application Laid-Open No. 8-255574.

  As described above, in the snow melting structure C according to the present invention, the snow melting block A (A1, A2) or the visually impaired person guiding block B (B1, B2) to be used does not have an electric heater as a heat source. The structure is simplified, and the implementation is facilitated, and electrical inconvenience (disconnection, short circuit, etc.) after the construction does not occur. In addition, even when subjected to intensive heating, the heat transfer material is only oxidized, and structural deterioration does not occur. Therefore, the road snow melting structure C is maintained in a stable state over a long period of time.

  In the above description, the plate-shaped heat transfer material 10 is shown as an example of the heat transfer material. However, a powder or chip-shaped metal material or a ceramic material having good thermal conductivity can be used as the heat transfer material. . Furthermore, a honeycomb-shaped metal material can also be used. In the case of using a plate-like or honeycomb-like metal material, it is possible to improve the adhesion to the plate-like substrate 1 made of a cement-based material by forming irregularities (embosses) on the surface thereof.

  FIG. 8A shows still another example of the snow melting block according to the present invention. This snow melting block A3 is different from the snow melting block A2 shown in FIG. As shown in FIG. 8B, the plate-shaped heat transfer material 10 used here is made of an aluminum plate having a length of 300 mm, a height of 50 mm, and a thickness of 4 mm, and the through holes 13 are formed at equal intervals. 3 is the same as that shown in FIG. 3 except that the upper and lower end surfaces are wide portions 14. In the snow melting block A3, the plate-shaped heat transfer material 10 has the wide portion 14, whereby higher heat collection efficiency and heat transfer efficiency can be obtained.

  Hereinafter, the present invention will be described with reference to examples and comparative examples.

[Example]
(Example product 1) Punch holes having a diameter of 5 mm were formed in an aluminum plate of 30 cm × 5 cm × thickness 4 mm at intervals of 1 cm vertically and horizontally. This was arranged and fixed in parallel on a wooden formwork of 30 cm square at intervals of 5 cm. As a cement-based material for forming the plate-like substrate, a mortar in which a mixture of water and cement / sand was mixed at a weight ratio of 2: 1 was used in a mixture of cement / sand mixed at a weight ratio of 1: 1. The mortar is poured into the above-mentioned wooden formwork and taken out from the formwork after curing, so that an aluminum plate is embedded as a heat transfer material in a 30 cm × 30 cm × 5 cm cement structure. Example product 1 was obtained.

(Example product 2)
The same aluminum plate as that used in Example Product 1 was prepared by forming concave grooves to be incorporated in a lattice shape, and incorporated in a lattice shape at intervals of 5 cm as shown in FIG. It was placed and fixed in the same wooden form as used in Example Product 1. As a cement-based material for forming a plate-like substrate, a mortar mixed with a mixture of water and a mixture of water at a weight ratio of 2: 1 is poured into a wooden formwork into a mixture of cement and sand mixed at a weight ratio of 1: 1. By taking out from the frame, an example product 2 having a shape shown in FIG. 1A in which a lattice-shaped aluminum plate was embedded as a heat transfer material in a cement structure of 30 cm × 30 cm × 5 cm was obtained.

[Comparative example]
As a cement-based material for forming a plate-like substrate, a mortar obtained by mixing a mixture of cement and sand at a weight ratio of 1: 1 and a mixture of water and a mixture of water at a weight ratio of 2: 1 as in Example products 1 and 2. Using. This mortar was poured into a 30 cm square wooden form as in Examples 1 and 2 to produce a cement structure (comparative example) of 30 cm × 30 cm × 5 cm.

[Heating test]
Inside the thermostatic chamber, tape heaters (product name: Sekisui Ceramics Tape Heater) manufactured by Sekisui Plastics Industry Co., Ltd. are arranged in three rows under Examples 1 and 2 and Comparative Example, and a voltage of 100 V is applied to the tape heater. Was applied. And the temperature change of the surface side was measured with time using the contact-type thermometer. The results are shown in the graph of FIG. In the graph, 1 is the temperature of the surface of the mortar surface of the comparative product, 2 is the temperature of the top surface of the aluminum plate of Example product 1, and 3 is the temperature of the mortar surface of the center of Example product 1. 4 is the temperature of the upper end surface of the aluminum plate of Example Product 2, 5 is the central part of Example Product 2, the temperature of the mortar surface, and 6 is the temperature in the thermostatic chamber.

[result]
1. The temperature of the comparative example product was slower than the example products 1 and 2, and the temperature reached was lower. This is a result of low heat conduction because no aluminum plate is provided.

2. In the example product 1, the ultimate temperature is higher in both the mortar part and the aluminum plate part and the temperature rise is faster than in the comparative product. This is a result of the high thermal conductivity of the aluminum plate. Moreover, it can be said that the heat is transmitted to the surface side by the high heat conduction of the aluminum plate, and the heat spreads to the mortar part. The temperature reached after 13 hours (780 min) is about 2 ° C. higher in the aluminum plate than in the mortar portion, which is a proof that the heat flow has moved from the aluminum plate to the mortar portion.

3. In Example Product 2, both the aluminum plate portion and the mortar portion had the highest reached temperature after 13 hours (780 min), and there was no temperature difference. This is a result of arranging the aluminum plates in a lattice shape. Moreover, since the aluminum plate is put densely, it is the backing that the heat of the aluminum plate portion is efficiently transmitted to the mortar portion.

[Evaluation]
From the graph, it is understood that the snow melting block and the visually impaired person guiding block according to the present invention can obtain high heat transfer efficiency by embedding an aluminum plate in the mortar portion. This indicates that the road snow melting structure using the snow melting block and the visually impaired person guiding block according to the present invention can provide high snow melting efficiency, which is practically significant.

A (A1, A2) ... Snow melting block,
1 ... A plate-like substrate made of a cement-based material,
10 (10a, 10b) ... plate-shaped heat transfer material,
11: a groove formed in a plate-shaped heat transfer material,
13 ... Through hole formed in plate-shaped heat transfer material,
B (B1, B2) ... Blind person guidance block,
20 (20a, 20b) ... the uneven panel 21 ... the rubber main body of the uneven panel,
22 ... point-like protrusions,
23 ... Linear protrusion,
C: road snow melting structure according to the present invention,
D: Long tape-shaped electric heater.

Claims (7)

A snow melting block embedded in a roadbed, comprising a plate-like substrate made of a cement-based material and a heat transfer material made of a metal material or a ceramic material embedded in the plate-like substrate, the heat transfer The material is a plate-shaped heat transfer material, and one or more of the plate-shaped heat transfer materials are arranged vertically in the thickness direction of the plate-shaped substrate, and the plate-shaped heat transfer material is formed on upper and lower end surfaces. A snow-melting block, characterized in that both or one of them is arranged in an exposed state . 2. The snow melting block according to claim 1 , wherein two or more of the plate-like heat transfer materials are arranged at intervals in one direction. The snow melting block according to claim 2, wherein the plate-shaped heat transfer material has a wide portion wider than a portion arranged vertically on an end surface thereof. The snow melting block according to claim 1 , wherein two or more of the plate-shaped heat transfer materials are arranged so as to intersect each other. The snow melting block according to any one of claims 1 to 4 , wherein the plate-shaped heat transfer material has one or more through holes. A block embedded in a roadbed, comprising the snow melting block according to any one of claims 1 to 5 and an uneven panel laminated on an upper surface thereof, for guiding a visually impaired person block. An elongated tape-like electric heater laid on the roadbed, in any one of claim 1 to 5 arranged in rows so as to backside contacts on the the elongated tape-like electric heater A snow melting structure for a road comprising the snow melting block according to claim 6 or the visually impaired person guiding block according to claim 6 .

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