Methods for reducing radiant heat

Abstract

This invention provides a method for reducing radiant heat that can prevent heatstroke among workers on the covering plates, while also considering the needs of underground workers. [Solution] A coating layer 5 is formed by applying paint to the surface of the covering plate 1 laid at the construction site. The brightness of the coating layer 5 is lower than the brightness of the surface before coating. Lowering the brightness increases the absorption of heat by the covering plate 1 when exposed to sunlight, and radiant heat concentrates in the vicinity of the covering plate.

Description

Technical Field

[0001] The present invention relates to a method for reducing radiant heat.

Background Art

[0002] When excavating under the road surface for underground construction, shoring plates are used to enable people and vehicles to pass above the underground space or to secure a working area on the ground (for example, Patent Document 1). A shoring plate is a temporary member that covers at approximately the same height as the road surface and is often made of steel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On hot days, workers on the shoring plate are at risk of heatstroke due to direct sunlight and radiant heat from the shoring plate. Spraying water on the shoring plate to relieve the heat makes it comfortable for the workers on the shoring plate, but the humidity underground increases, resulting in a harsh working environment for the underground workers. Therefore, an object of the present invention is to provide a method for reducing radiant heat that can prevent heatstroke of workers on the shoring plate while also considering underground workers.

Means for Solving the Problems

[0005] The present invention provides a method for reducing radiant heat, in which a paint is applied to the surface of a shoring plate laid at a construction site to form a coating layer, and the lightness of the coating layer is lower than the lightness of the surface before application.

[0006] By applying paint to the surface of the roofing panels to lower their brightness, the panels absorb more heat from sunlight, and radiant heat concentrates near the panels. Since radiant heat is reduced at a distance from the surface of the panels (for example, at a height of 1 meter), the heat felt by workers is reduced. Note that this "radiant heat" includes sunlight that is simply reflected.

[0007] In this invention, the lightness of the coating layer may be 1.5 to 4.0 in terms of lightness according to the Nippon Color Research Institute color scheme. Since this lightness is lower than that of a normal lining board, the coating layer absorbs heat more readily than the original lining board surface.

[0008] In the present invention, the coating layer may be black.

[0009] In the present invention, the surface before coating has an anti-slip layer consisting of irregularities, and the coating layer may be formed to a thickness such that the anti-slip function of the anti-slip layer is maintained even after the coating layer is formed. This ensures that the anti-slip function that was present before coating is maintained even after coating.

[0010] In this invention, multiple lining plates are laid in a continuous manner, and the coating layer may be formed across multiple lining plates. This allows for easy coating of multiple lining plates, thus reducing the effort required for coating. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a method for reducing radiant heat that can prevent heatstroke among workers on the covering plates while also considering the needs of underground workers. [Brief explanation of the drawing]

[0012] [Figure 1] (A) is a diagram showing the condition of the paint before application, and (B) is a diagram showing the condition of the paint after application. [Modes for carrying out the invention]

[0013] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In each drawing, the same parts or corresponding parts are denoted by the same reference numerals, and redundant descriptions are omitted.

[0014] As shown in Figure 1, the covering plates 1 are plate-shaped and are laid between support structures 3, 3 that are arranged at predetermined intervals, so as to cover the underground space 2 constructed by excavating beneath the road surface at the construction site. The covering plates 1 are rectangular in plan view, and multiple plates are laid continuously in the length direction (left-right direction in the illustration) as well as in the width direction (depth direction in the illustration). In this way, a site with a large area in plan view is formed by multiple covering plates 1, and the opening of the underground space 2 is covered by multiple covering plates 1.

[0015] The covering plate 1 is located at approximately the same height as the unexcavated road surface. While covering plates are generally laid to allow people and vehicles to pass above the underground space 2, in this embodiment, workers 4 work on the covering plate 1. Although not shown, workers also work in the underground space 2.

[0016] In the radiant heat reduction method of this embodiment, a coating layer 5 is formed by applying paint to the surface of the covering plate 1. The coating layer 5 is formed in a single application over multiple covering plates 1. The paint used may be for rust prevention or corrosion prevention, and may be water-based or oil-based. The paint used may also be a varnish or an asphalt-based material. The paint used may also be a dye or a pigment. Masu.

[0017] The lightness of the coating layer 5 shall be lower than the lightness of the surface of the lining plate 1 before coating. Here, the lightness is preferably 1.5 to 4.0 in the Japan Color Research Institute color scheme. The Japan Color Research Institute color scheme uses a system where the lightest white is 9.5 and the darkest black is 1.5, with 15 achromatic colors inserted at equal intervals between them, and is expressed in 17 steps with values ​​in increments of 0.5.

[0018] The chroma of the coating layer 5 is preferably lower than the chroma of the surface of the sheathing board 1 before coating. The chroma is preferably 0s to 3s as the chroma in the Japan Color Research配色 system. The chroma of the Japan Color Research配色 system sets achromatic colors as 0s and the ideal pure colors of each hue as 10s. The chroma is classified into low chroma (1s to 3s), medium chroma (4s to 6s), and high chroma (7s to 9s) so as to be perceptually felt at equal intervals.

[0019] The coating layer 5 is preferably black. Here, black means a lightness of 1.5 to 2.5 and an achromatic color.

[0020] The sheathing board 1 may have an anti-slip layer composed of irregularities on the surface before coating. In this case, the coating layer 5 is formed to have a thickness that maintains the anti-slip function of the anti-slip layer even after the coating layer 5 is formed. Thereby, the anti-slip function provided before coating is maintained even after coating. In particular, when the anti-slip layer is formed by spraying or applying white-based fine aggregate, the effect of the coating in this embodiment is great.

[0021] When the coating layer 5 is not formed on the surface of the sheathing board 1, the sheathing board 1 that has received the energy of sunlight strongly radiates heat, so the temperature of the working space tends to rise (Fig. 1(A)). On the contrary, in the radiant heat reduction method of this embodiment, a paint is applied to the surface of the sheathing board 1 to make the surface lightness lower than before coating, so the heat absorption of the sheathing board 1 that has received the energy of sunlight increases, and the radiant heat concentrates in the vicinity of the sheathing board. In addition, since the radiant heat becomes small at a position away from the surface of the sheathing board, the heat felt by the operator is reduced (Fig. 1(B)). Therefore, the rise in the temperature of the space on the sheathing board 1 is suppressed to a small extent, and heat stroke of the operator 4 can be prevented. In particular, the rise in temperature at a height of 1 m is suppressed to a small extent. In Fig. 1, the length of the arrow represents the range where the radiant heat reaches strongly.

[0022] Also, in the radiant heat reduction method of the present embodiment, even if the coating layer 5 is provided to absorb the energy of sunlight, there is almost no change in the environment for the underground space 2, so the working environment of underground workers does not deteriorate. Further, in the present embodiment, the coating layer 5 is simultaneously formed over the plurality of formwork boards 1 in a state where the plurality of formwork boards 1 are continuously laid, so the labor for coating is smaller than the case of coating the formwork boards one by one.

[0023] As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments in any way.

Example

[0024] A plurality of brown formwork boards with a length of 300 cm and a width of 100 cm, having small protrusions arranged in a grid pattern on the surface, were prepared and spread out side by side in the width direction. On a sunny day, when the temperature near the surface of the formwork board was measured, it was 59.4 °C. When the temperature at a height of 1 m at that point was measured, it was 48.4 °C.

[0025] Among the spread-out formwork boards, a coating layer was formed by applying black varnish, which is an oily asphalt-based anticorrosive material, over three consecutive formwork boards in the width direction. When the coating layer dried, small protrusions on the surface of the formwork board protruded on the surface of the coating layer. On a sunny day, when the temperature near the surface was measured near the center of the coating layer, it was 61.3 °C. When the temperature at a height of 1 m at that point was measured, it was 44.3 °C.

[0026] From the above results, it is considered that when the coating layer was formed, compared with the case where the coating layer was not formed, the energy of sunlight was absorbed by the coating layer and the heat absorption increased, so the radiant heat concentrated near the formwork board and the radiant heat decreased at a height of 1 m from the surface of the formwork board.

Industrial Applicability

[0027] The present invention can be used to improve the working environment on formwork boards.

Explanation of Signs

[0028] 1...Covering plate, 2...Underground space, 3...Support structure, 4...Worker, 5...Coating layer.

Claims

1. A coating layer is formed by applying paint to the surface of the covering plates laid at the construction site. A method for reducing radiant heat, wherein the brightness of the coating layer is lower than the brightness of the surface before coating.

2. The method for reducing radiant heat according to claim 1, wherein the lightness of the coating layer is 1.5 to 4.0 as a lightness according to the Nippon Color Research Institute color scheme.

3. The method for reducing radiant heat according to claim 2, wherein the coating layer is black.

4. The surface before coating has an anti-slip layer consisting of irregularities. The method for reducing radiant heat according to claim 1, wherein the coating layer is formed to a thickness such that the anti-slip function of the anti-slip layer is maintained even after the coating layer is formed.

5. The aforementioned covering plates are laid in a continuous series of multiple plates. The method for reducing radiant heat according to claim 1, wherein the coating layer is formed over a plurality of the covering plates.

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