JPH10237837A - Snow melting floor for platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the embedding density of heat mediums and save the energy by constituting a snow melting floor by a cement hardened body having a tubular or rope-like heat medium embedded therein, and laying a metallic mesh body extended laterally so as to enclose the heat medium. SOLUTION: This snow melting floor has a floor structure in which a metallic mesh body 3 is embedded in a cement hardened material, so that the heat flow from a heat medium 2 is laterally transmitted through the metallic mesh body 3 and primarily dispersed. Further, since secondary dispersion is caused in the cement hardened body to transfer the heat through two heat flow bulkheads, the heat flow is dispersed to a position distant from a heating source for heating, so that the heating floor area can be extended. As the metallic mesh body 3, an alloy containing 0.3-4.3wt.% of Mn, as occasion demands, 0.05-6.0wt.% of Mg, and the remainder of Al and impurities, and having a tissue in which Al-Mn intermetallic compound precipitate with a grain size of 0.01-0.3μm is dispersed is used, and an anodic oxide film is formed on the surface. Thus, the heating floor area can be extended, the heat medium 2 can be stably held with a lowered embedding density, and the foundation work can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow-melting floor for preventing snow and freezing of a platform, and more particularly to a snow-melting floor for a platform which is excellent in heat dispersibility from a heat medium, abrasion resistance and impact resistance. About.

[0002]

2. Description of the Related Art Platforms for departure and arrival of trains and the like, and getting on and off, are places where an unspecified number of passengers get on and off trains and wait for incoming trains or avoid trains passing at high speed. In addition, the boarding / alighting step side, which is open without any special barriers, has a structure with a large head and a cliff. Such a platform structure inherently has a great anxiety factor in ensuring passenger safety.

[0003] Particularly in snowy or cold areas, snow accumulation on the platform or freezing thereof occurs on a daily basis and significantly impairs the safety environment for passengers. For this reason, snow removal and deicing of the platform floor are indispensable, but snow removal under the wind and snow in a long area is not easy, and spraying of inorganic salt solution commonly used for melting snow on roads or snow removal vehicles etc. Implementation is not possible due to the platform environment. In addition, snowmelt and ice melting due to water discharge and sprinkling are likely to be uneven, and since it is necessary to use a large amount of water to maintain running water on the floor, wetting passengers' footwear, wetting the floor inside the train and making it slippery And makes it difficult to clean the inside of the vehicle.

Conventionally, in order to solve such a problem, a so-called heated floor structure using electric heat or hot water as a heat source has been proposed. That is, (1) The invention described in Japanese Patent Application Laid-Open No. 49-96025 discloses a method in which a hot water pipe from an electrothermal hot water source has a fixed length and a fixed interval, and singly or in combination of a plurality of units buried under the floor and adjusted and sent. A hot water heater that achieves uniform heating and power saving. (2) The invention described in Japanese Patent Application Laid-Open No. 06-101205 discloses a step of embedment of a radiating panel storing and holding a heating wire or stepping on and off a heating plate storing a heating wire detachably in a storage portion formed in the panel. It is intended to quickly melt snow by arranging it directly in the part. (3) The invention described in Japanese Patent Application Laid-Open No. H06-171501 discloses a method of installing a heating panel on an open surface opposite to a snow-covered surface (for example, the back surface of a step) to reduce the heat transfer efficiency of a structure in a heat source buried system. It is intended to prevent the deterioration and deterioration of the durability.

[0005]

In the above-mentioned conventional proposals, (1) and (2) embed a heat medium below the floor,
Alternatively, a cement-based hardened body heat-dissipating panel with embedded or inserted heating wires is used as a snow-melting floor, and the rate of temperature rise on the floor is fast, and although there is a corresponding effect, the uniformity of heating of the floor is insufficient. In order to improve this, it is necessary to increase the amount of heat radiated from the heat source per unit area, and overheating of the cement-based hardened material near the heat source causes its deterioration or increases the laying density of the heat source. There is a problem that the equipment cost increases because of necessity. In (3) above, since the heat panel is installed outside the open surface opposite to the snow-covered surface (for example, the back of the step), heat is greatly dissipated to the outside air, which causes a decrease in thermal efficiency and also raises the temperature of the floor surface. There are problems such as a decrease in speed.

SUMMARY OF THE INVENTION In view of the above, the present invention is based on the premise that the floor of a platform is melted and melted without being wetted by spraying water or spraying water, and that no manual work is required. It is an object of the present invention to provide a snow melting floor of a platform that achieves uniform heat transfer from a buried heat medium, thereby reducing the burying density of the heat medium and saving energy.

[0007]

The present invention has been achieved as a result of various studies to solve the above-mentioned problems.
The invention according to the invention relates to a snow melting floor of a platform made of a cement-based hardened material in which a tubular or cord-shaped heat medium is embedded, and a metal mesh body that covers the tubular or cord-shaped heat medium and extends in the lateral direction is stretched. It is characterized by a snow melting floor on the platform.

[0008] The invention according to claim 2 is characterized in that the cement-based cured product according to claim 1 is in the form of a panel, which is arranged on a floor surface and connected to a heat medium terminal.

The invention according to claim 3 is characterized in that the cement-based cured product according to claim 1 or 2 is obtained by mixing a cationic chloroprene rubber emulsion.

According to a fourth aspect of the present invention, the tubular or cord-shaped heat medium according to any one of the first to second aspects is arranged in a meandering manner on the aluminum foil surface, and is arranged on at least one of the upper and lower surfaces of the heat medium. It is characterized by being covered with a metal net.

The invention according to claim 5 is characterized in that the metal mesh has a far-infrared radiation surface.

According to a sixth aspect of the present invention, the metal net has a Mn of 0.3 to 4.3 wt%, and optionally a Mg
Al-M containing 5 to 6.0 wt%, the balance being Al and unsuitable impurities, and having a particle size of 0.01 to 0.3 μm.
An alloy having a structure in which n-type intermetallic compound precipitates are dispersed, and an anodic oxide film is formed on the surface thereof.

[0013]

According to the first aspect of the present invention, since the metal net which covers the tubular or cord-like heat medium and spreads in the lateral direction is a floor structure embedded in a cement-based hardening material, The heat flow from the heat medium is laterally transferred through a metal net having excellent thermal conductivity and is dispersed to a primary degree. Further, secondary dispersion occurs in the cement-based hardened material. Since heat is transferred through the heat flow barrier, the heat flow is dispersed and transferred not only around the heat medium but also at a position distant from the heating source, and the area of the heated floor, that is, the area of snow melting and ice melting is enlarged.

Further, since the heat medium is buried in the cement-based hardened body of the platform structure and integrated, after the heat medium is buried in the lower layer of the floor surface, the heat medium is firmly held at the buried position and level, and is stable. In addition, the deformation stress is not easily applied to the heat medium, and therefore, the connection portion of the heating source is also stably held, and the damage due to falling off or the like hardly occurs.

According to the second aspect of the present invention, since the heat medium of the first aspect has a panel shape formed and hardened in advance and the heat medium of the first aspect is embedded therein, the panels are arranged on the floor surface, Connecting the terminals greatly simplifies on-site construction, shortening the construction period and improving the finishing accuracy. In addition, there is an effect that the heating speed is improved by the approach of the heat medium and the floor surface.

According to the third aspect of the present invention, since a cement-based hardening material mixed with a cationic chloroprene emulsion is used, the floor surface formed has high strength.
Excellent impact resistance, abrasion resistance, etc., a strong floor surface is formed, and the structural stability, especially at the entry / exit step or its tip, is improved. Surface. A step tile having high reliability is obtained by firmly holding a guide tile or the like for the visually impaired stuck on the stepping on / off step. Further, since a strong floor surface is formed, the burying of the heat medium can be set in a shallow layer, which is useful for increasing the temperature rising rate of the floor surface.

According to the fourth aspect of the present invention, since the tubular or cord-like heat medium is arranged flush with the aluminum foil surface, the heat dissipated by the heat medium is reflected on the aluminum foil surface. This prevents the heat from dispersing to the floor and concentrates the heat on the floor, increasing the heating effect. The metal net is
A sufficient effect is exhibited by enclosing the metal net on at least one of the upper and lower surfaces of the heat medium.

According to the fifth aspect of the present invention, when the surface of the metal net heated by the heat medium has far-infrared radiation, a phenomenon that the uniformity of the floor surface temperature is further enhanced is recognized. This is due to the action of far-infrared radiation, which emits electromagnetic waves in the wavelength range of about 3 to 1,000 μm, passes through space, is absorbed by the object to be heated, and excites thermal motion in the substance to raise the temperature of the substance.

According to the sixth aspect of the present invention, as the metal net, a specific Al-Mn alloy material as described in JP-B-07-116639, that is, Mn 0.3 to 4.3.
Al-Mn intermetallic compound precipitate containing 0.05% to 6.0% by weight of Mg and, if necessary, 0.05 to 6.0% by weight of Mg, with the balance being Al and unsuitable impurities and having a particle size of 0.01 to 0.3 µm. An alloy having a structure in which is dispersed is used, and the surface thereof is coated with an anodic oxide film. Such Al
-Since the formation of the anodic oxide film of the Mn-based alloy grows so as to avoid the precipitation portion of the Mn-Al-based intermetallic compound, the formed anodic oxide film has a branched porous complex structure. Therefore, under the condition of radiating far-infrared rays, the effect of relaxing stress caused by thermal strain is strong, cracks are unlikely to occur even when quenched from a high temperature, and it has heat resistance to withstand a high temperature of about 500 ° C.

Further, since the anodic oxide film has a color close to black, the infrared radiation characteristics do not deteriorate in a wide wavelength range including a short wavelength of 4 to 8 μm. An even more important property is that, even after the formation of the anodic oxide film, it can be formed without changing its characteristics, and it is necessary to add a deformation that encloses the anodized net in a tubular or cord-like heat medium. However, it is highly adaptable in that the far-infrared radiation characteristics described above are not impaired.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment with reference to FIGS. FIG. 1 is a perspective view of a boarding / alighting step unit 10 in which a heat medium 1 having a metal mesh body 3 wrapped under a floor is buried in a concrete structure of a platform in one embodiment of the present invention. The buried part is shown exposed. FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. 3 is a sectional view taken along the line BB ′ of FIG.

The heat medium 1 may be any of an electric heating wire and a flow pipe of a hot fluid (hot water, steam, hot air, etc.), and a combination of the two is also possible. Combination of drainage and an electric heating cable or the like is appropriately performed. Hot water heaters using late-night electricity, kerosene-fired hot water boilers, waste heat recovery hot water, hot spring springs, etc. are all good targets. The arrangement of the heat medium 1 can have various patterns, but in the case of hot water or hot air piping, it is general to connect the branch pipe from the heat flow main pipe in a meandering arrangement as shown in FIG. A system in which a long section is meandering with a series is not preferable in terms of heat exchange. In the case of a heating wire, a parallel resistance circuit is formed for each divided block,
Wiring is performed in consideration of circuit resistance, such as coupling this to a series circuit.

The envelope connection between the heat medium 1 and the metal net 2 can be in various modes. 6A, 6B, and 6C, the metal net 2 is placed on the outer peripheral surface of the heat medium 1 from above or below, as shown in FIGS. 6A, 6B, and 6C. A method of enclosing or a method of encapsulating the heat medium from both upper and lower sides by sandwiching between two layers of nets as shown in (c) is also suitable. Further, FIG.
As illustrated in (e), a method in which the heating medium 2 is brought into contact with the upper or lower surface of the flat mesh body 3a and the heating medium is covered with the U-shaped concave mesh body 3 may be used. In this case, the U-shaped concave mesh body 3 encloses the heat medium 2 and is arranged at intervals as shown in FIGS. 6D and 6E without strong and continuous between the rows of the heat medium 2. May be. Heat medium 2 with a flat mesh
The structure shown in FIG. 6A may be formed by pressing up and wrapping up at the site, but the metal net 3 has a U-shaped cross section in which the heat medium is fitted at a position corresponding to the position of the heat medium 2. Is more preferably formed in advance. In this case, by forming the U-shaped groove with a diameter somewhat smaller than that of the heat medium 2, the elastic urging of the mesh body acts on the fitting of the two to firmly adhere.

The metal mesh 3 is formed by braiding a metal wire or a metal plate or by inserting short cuts penetrating in a zigzag pattern into a metal plate at regular intervals and extending the metal plate in a direction perpendicular to the cuts. What is known as a so-called expansion metal or expanded net to be formed can be preferably applied. This object is compared to a braided net,
Each line forming the net is continuously integrated, which is extremely effective for heat conduction and heat dispersion. The thickness of the expansion metal base plate is determined in consideration of stiffness, tensile strength, heat flow density and the like, and is in the range of 0.3 to 2.0 mm for aluminum or steel.

The material of the metal net 2 may be any material as long as it has corrosion resistance and strength when buried underground.
Aluminum, iron or one of their alloys is commonly used. In steel, rolled steel for general structures (JIS
-SS41P), pure aluminum (JIS-1100), Al-Zn-Mg (JIS-7N01, etc.), Al-
Mg-based (JIS-5083 etc.) Al-Si-Mg-based (J
IS-6063) Al-Mn-Cu (JIS-30)
04) and the like are selected in consideration of the underground environment, particularly the corrosive environment. Carbon steel (JIS-SS50P etc.) or aluminum alloy JIS-5083, 3004 etc. is suitable for groundwater infiltrated ground with high salt content. Normal copper (Cu 99.5 ≦) or silicon bronze (3% Si, 1%
Sn-containing) is preferable because of its excellent corrosion resistance.

Further, the metal mesh body subjected to the corrosion-resistant coating treatment increases the adaptability. It is preferable that carbon black is subjected to black scale oxidation treatment, aluminum is subjected to anodic oxidation treatment, chemical surface treatment, or is subjected to corrosion-resistant resin coating or the like. In the latter, resins such as epoxy, acrylic, urethane,
Styrene, vinyl, etc., resin film thickness is 10-50μ
The range of m is appropriate. Coatings having a thickness of more than 50 μm are not preferred because they impair the heat dissipation of the metal surface.

In the present invention, a metal mesh having a far-infrared radiating surface is suitably formed by coating a known far-infrared radiating material on a substrate surface selected from aluminum, iron, copper or a base alloy thereof. Is done. For example, there is a metal net or the like having the surface sprayed or coated with a ceramic material such as alumina, graphite, or zirconia, or provided with an anodized film. In particular, the anodized material of the above-described Al-Mn- (Mg) -based alloy (described in Japanese Patent Publication No. 07-116639)
Has excellent heat resistance and far-infrared radiation characteristics, and is highly adaptable to applications such as the present invention.

As the cement-based hardening material used in the present invention, general-purpose mortar or concrete obtained by mixing Portland cement with an aggregate and, if necessary, various admixture polymers (SBR, acrylic, etc.) is used. In particular, those based on cationic chloroprene rubber latex as an admixture (trade name: Neoment 102M, polymer solids 45 ± 1%, manufactured by Showa Denko Dupont Co., Ltd.)
As a hardening material of the present invention, cement mortar and concrete hardened material have the characteristics of significantly improving the impact resistance and abrasion resistance, as well as having low water absorption and low water permeability, and good adhesion to metal. Suitable for several% to 15% of cement
The effect is manifested with a small amount of addition.

[0029]

The present invention will be described below with reference to more specific examples. Example 1 As shown in FIG. 1, the above-described heat medium 2 was placed under a floor 1.5 m wide from the tip S of the step of getting on and off the platform structure T.
Is arranged. In this example, the heat medium 2 is a cross-linked polyethylene pipe (tube outer diameter 17 mm) for passing hot and cold water,
A meandering pipe with a core spacing of 250 mm, and a metal net 3
Was covered in the upper half as shown in FIG. 6- (a), and both were bound and fixed intermittently with metal filaments (not shown). The covering area of the metal net 3 was the entire area (crossing line in FIG. 1) other than the bent part of the heat medium pipe 2.

The metal net 3 is made of Al-Mn (M
g) A net having excellent irradiance of far infrared radiation (commercial product name "Super Ray", Sky Aluminum Co., Ltd.) was used.

A heat insulating layer (a thickness of 5 cm) 4a containing perlite is laid on the platform foundation concrete, a heating medium 2 wrapped with a metal net 3 is laid thereon, and a concrete mortar 4 (ordinary) is laid thereon. Portland cement 40kg, river sand, gravel No. 5 120kg, city water 12K
g, and 50 g of an antifoaming agent), and the mixture was filled into an almost flat surface and cured and cured. A non-slip floor tile 6 and a guide tile 7 for visually impaired persons were attached to the hardened surface 5 to complete the platform snow melting floor 1. FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a cross-sectional view taken along the line BB ′ of FIG. 1.

Example 2 A wire mesh (wire diameter: 1.4 mm, mesh size: 4.76 m) obtained by regular resistance welding of carbon steel wire in a grid as a metal mesh body.
m) is the same as that of the first embodiment except that a U-shaped cross section in which the heat medium is fitted is previously formed at a position corresponding to the arrangement of the heat medium 1.

Example 3 The same as the first example except that an aluminum foil (0.08 mm thick, alloy JIS-1100) was laid under the heat medium 1.

Example 4 As shown in FIG. 4 and FIG. 5, an example of a precast concrete panel in which a heat medium is buried, wherein a heating wire 2 is A2 (JI
SC 3651) was insulated and wired in a panel, and connection terminals of each panel were connected to form a parallel or series electric circuit. As for the panel, a metal net (same as the first example) is wrapped around the heating wire and held at an appropriate level in the molding frame, and the concrete mortar (40 kg of ordinary Portland cement, river sand, gravel No. 5) 12
0 kg, city water 12 kg, defoamer 50 g)
The resin was filled tightly by applying vibration in the horizontal direction, and was released from the mold after air curing for 21 days by a conventional method to obtain a plate-shaped cured panel 8. The panel dimensions are 1.00m x 1.55m on a plane, and the thickness is 50
mm.

EXAMPLE 5 A cationic latex admixture of chloroprene rubber was added to a concrete mortar slurry (trade name: Neoment 1
02M "(manufactured by Showa Denko / Dupont Co., Ltd.) in the same manner as in Example 4 except that 9 kg was mixed. The results of investigating the characteristics of the panels manufactured according to Example 4 and Example 5 (the figures in parentheses indicate the panel of Example 4) show the impact resistance index (JIS-JIS).
A1421) is 13 (4), and the compressive strength is 46.4.
(31.2) N / mm ² , and the bending strength was 11.3 (6.
4) N / mm ² , water absorption was 5.0 (7.5)%. As described above, the lower layer of the platform floor and the floor panel of the present invention each have sufficient strength and are solid, but in particular, cement mortar mixed with a cationic chloroprene emulsion, and those made of concrete, Excellent strength, water absorption and impact resistance were observed.

In the floor structure of each of the above examples, a thermocouple is buried on the back of the floor panel to form a floor temperature sensor (not shown), and the outside air temperature is measured. Input control. Limits are set for the floor temperature and the outside temperature, and when the temperature falls below the threshold, the input of the heat medium or the opening of the hot water valve is activated, while the overheating of the heat medium is dealt with by shutting off the power supply, hot water valve or reducing the input. The control method was applied. As a result, it was possible to appropriately control the floor temperature in accordance with the degree and degree of weather change, snow accumulation, freezing, and the like.

[0037]

[Comparative example]

Comparative Example 1 In Example 1, the floor was constructed under the same conditions except that the heat medium 2 was not covered with a metal mesh.

Comparative Example 2 In Example 4, a floor was constructed under the same conditions except that the heat medium 2 was not covered with a metal mesh.

Length 2.0 according to the above example and comparative example
m (1.5 m width) of a platform snowmelt floor was constructed, and the surface temperature of the platform floor surface in the cold season was measured. The temperature measurement position is 0.75 from the platform tip surface S.
m and P (m in FIG. 3 and FIG. 4) and the middle position (Q in FIG. 3 and FIG. 4) of the row of the buried heat medium. As shown in FIG.

[0040]

[Table 1]

As is clear from the numerical values in Table 1, in the embodiment in which the metal mesh is covered with the heat medium, the maximum temperature (16 ° C.) is reached after about 2.0 hours, and P, Q
It is recognized that there is almost no temperature difference, that the temperature distribution on the floor surface is uniform, and that in the case of a heat medium enclosing a metal net having a far-infrared radiating surface, the rate of temperature rise is large. In contrast, in the comparative example in which the heat medium was simply buried, the rate of temperature rise was small, the temperature difference between P and Q was large, and there was no sign of uniformity even after 3.0 hours.

10 m length according to the above embodiment and comparative example
The melting of the frozen floor surface during the cold season was investigated by constructing a snow melting floor on the platform. The floor was warmed at an outside temperature of -6 to -2 [deg.] C. and water was applied to the floor to freeze it, and the ice thickness was set to 0.7 cm. Thawing started about 2.0 hours later, and all ice was thawed 3.0 hours later. However, in the case of the comparative example, defrosting occurred on the floor at the position where the heat medium was buried, and this state was maintained until about 2.0 hours had elapsed. (1.5 m width from the step tip) was observed all the time, and the effect of uniform heat dispersion was clearly recognized.

The snow cover condition on the platform floor during snowfall was investigated. Immediately after the start of snowfall, hot water was sent to or received from the heat medium, the floor was heated, and the progress of snowfall was observed.
One hour after the start of the floor heating, the floors of the examples all had a reduced snow depth, that is, the melting of snow started, and after about 1.5 hours, the melting of the snow progressed uniformly over the entire area of the heated floor. After about 3.0 hours, the non-heated floor area has a snow depth of 2
Although it reached 5 cm, no snow was observed in the working area of the example of the present invention, and the floor surface was exposed. On the other hand, in the comparative example construction area, a ridge-shaped snow cover having a depth of 5 cm remained between the heat medium burying positions, and the snow melting was uneven. After about 5 hours, the unheated floor area had reached a snow depth of 45 cm,
There was no snow in the working area of the working example of the present invention. However, the ridge-shaped snow cover of about 10 cm in depth still remained in the comparative example construction area.

[0043]

In the snow melting floor of the platform according to the present invention, since the metal net which covers the heat medium and spreads in the lateral direction is embedded in the cement hardening material, the heat flow from the heat medium is made of metal. Dispersed by mesh and cement-based hardened material,
There is an effect that the burying density can be reduced because the heating area is increased. In addition, since the heat medium is buried in a high-strength cement-based hardened body, the heat medium is stably maintained in the lower layer of the floor after embedding, and the foundation work is simplified, or the buried layer can be made shallower, shortening the construction period, This has the effect of reducing construction costs. In addition, at the construction site, the precast heating panels need only be arranged and connected below the planned floor surface level, so that there is an advantage that the on-site work is simplified and the construction error does not occur and no special skills are required.

The effect of the present invention is useful for preventing snow on platforms such as railways in snowy areas or cold and frozen areas, for melting snow or for melting ice on frozen floors, due to the effects described above.
Practical convenience is great.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partially exposed state in which a heat medium enclosing a metal net 2 is buried under a floor of a platform according to a first embodiment.

FIG. 2 is a longitudinal sectional view taken in the direction of arrows A-A 'in FIG.

FIG. 3 is a vertical sectional view taken in the direction of arrows B-B 'in FIG.

FIG. 4 is a vertical sectional view of a precast heating panel of Examples 4 and 5 buried under a floor surface (as viewed in the direction of arrows DD ′ in FIG. 5).

FIG. 5 is a longitudinal sectional view of the heating panel buried below the floor surface (FIG. 4).
C-C 'arrow).

FIG. 6 is an explanatory diagram of a method of enclosing a metal net in a heat medium.

[Explanation of symbols]

 1 ... Platform floor 2 ... Heat medium 3 ... Metal mesh 4 ... Heat insulation layer 5 ... Hardened surface 6 ... Floor tile 7: Guide tile 8: Precast panel T: Platform structure S: Platform tip surface P: Temperature measurement position (immediately above heat medium embedded) Q .... Same as above (between heat carrier buried rows)

Claims (6)

[Claims] 1. On a snow melting floor of a platform made of a cement-based hardened material in which a tubular or cord-shaped heat medium is embedded, a metal net body that covers the tubular or cord-shaped heat medium and extends in the lateral direction is stretched. The snow melting floor of the platform, which has been set up. 2. The platform according to claim 1, wherein the hardened cementitious body is in the form of a panel, which is arranged on a floor surface or below the floor surface, and connected and embedded with a heat medium terminal. Snow floor. 3. The snow melting floor of a platform according to claim 1, wherein the hardened cementitious body is made of a mixture of a cationic chloroprene rubber emulsion. 4. The tubular or cord-like heat medium is arranged in a meandering manner on the surface of an aluminum foil or a plate, and at least one of the upper and lower surfaces of the heat medium is covered with a metal net. 4. The snow-melting floor of a platform according to claim 1, wherein: 5. The snow melting floor of a platform according to claim 1, wherein said metal net has a far-infrared radiation surface. 6. The metal net has a Mn of 0.3 to 4.3 w.
t%, if necessary, 0.05 to 6.0 wt% of Mg, the balance being Al and impurities, and a particle size of 0.01 to
6. The snow-melting floor of a platform according to claim 5, comprising an alloy having a structure in which a precipitate of an Al-Mn-based intermetallic compound having a thickness of 0.3 [mu] m is dispersed, and having an anodic oxide film formed on a surface thereof. . [0001]