Heat-shielding structure of a building

Abstract

This invention provides a heat-shielding structure for buildings that can be easily constructed by workers and reduces the load on the building. [Solution] The building's heat-shielding structure 1 comprises two opposing wall materials 21 positioned to protrude upward from the roof of the building, a steel plate 2 directly installed on the roof floor material 25, having a high reflectivity material 3 on the inside and having recesses 2A and protrusions 2B, a ventilation layer 4 formed between the protrusions 2B of the steel plate 2 and the roof floor material 25, a windbreak plate 5 provided in the ventilation layer 4 on one end of the steel plate 2, an intake-side cover material 6 attached to the upper part of one end of the steel plate 2 and sealing the top surface 2C of one end of the steel plate 2, an exhaust device 8A attached to the upper part of the other end of the steel plate 2, and an exhaust-side cover material 7 attached to the upper part of the exhaust device 8A. In this building's heat-shielding structure 1, outside air flows in from the recess 2A on one end, this outside air flows into the ventilation layer 4 via the intake port 11, passes through the exhaust port 12 formed in the recess 2A on the other end, and is discharged to the outside from the exhaust device 8A.

Description

Technical Field

[0001] The present invention relates to a heat insulation structure for a building that miniaturizes a steel plate with a heat insulation material attached to the indoor side so that anyone can carry it, enables transportation by a small car and unloading by an elevator, and by directly placing a heat insulation steel plate on the roof of the building, it can significantly improve the indoor environment and save energy in the building.

Background Art

[0002] There are buildings that have a mound on the roof and rooftop greening. Also, some buildings have a steel roof on the rooftop for heat countermeasures (for example, Patent Document 1).

[0003] Patent Document 1 describes a building heat insulation structure formed on the rooftop of a building. This building heat insulation structure is constructed by installing a plurality of liners on the floor of the rooftop of the building, installing a rooftop outer decorative material with irregularities on the liners with a gradient, and installing an opening and closing device outdoors on the water upper side of the rooftop outer decorative material. By constructing this building heat insulation structure, the entire building can be cooled or insulated according to the outside air temperature, producing an energy-saving effect.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0006] Furthermore, when constructing a heat-shielding structure on a building's rooftop, it is necessary to consider the load on the building. Moreover, it is highly desirable that the structure be easily constructed even by workers unfamiliar with the work.

[0007] This invention was made to solve these problems and aims to provide a heat-shielding structure for buildings that can be easily constructed by workers and reduces the load on the building. [Means for solving the problem]

[0008] The heat-shielding structure for a building according to the present invention comprises: a wall material facing each other and formed on the roof of the building, projecting upward from the roof of the building; a steel plate directly installed on the floor material of the roof, with a material having high reflectivity to radiant heat such as aluminum foil on the inside, and having recesses and protrusions; a ventilation layer formed between the protrusions of the steel plate and the floor material of the roof; a wind-stopping plate provided in the ventilation layer on one end of the steel plate; an intake-side cover material attached to the upper part of one end of the steel plate and sealing the top of one end of the steel plate; an exhaust device attached to the upper part of the other end of the steel plate; and an exhaust-side cover material attached to the upper part of the exhaust device. Furthermore, in the heat-shielding structure of this building, the steel plate is installed at a predetermined distance from the opposing wall material, thereby forming a first space enclosed by one end of the steel plate, one wall material, an intake-side cover material, and a floor material, and a second space enclosed by the other end of the steel plate, the other wall material, an exhaust device, and an exhaust-side cover material. The second space is sealed by providing a sealing member to close the recess at the other end of the steel plate, allowing outside air to flow into the first space from the recess at the one end, and the incoming outside air is drawn into the protrusion through an intake port formed in the windbreak plate and the floor material, passes through the ventilation layer, flows into the second space through an exhaust port formed in the protrusion at the other end, and is discharged to the outside from the exhaust device.

[0009] The heat-shielding structure for a building according to the present invention is characterized in that it is formed by connecting multiple steel plates, and the joints between the steel plates are connected with double-sided tape. [Effects of the Invention]

[0010] In the building heat shielding structure according to the present invention, a steel plate with a material that has a high reflectivity to radiant heat, such as aluminum foil, on the inside is directly installed on the flooring material of the building's roof, thus eliminating the need for components such as frames. Furthermore, outside air flows into the first space (intake side space) from a recess on one end of the steel plate, and the incoming outside air flows into the ventilation layer through an intake port formed between the windbreak plate and the flooring material, and flows into the second space (exhaust side space) from an exhaust port formed in the recess on the other end, and is discharged outdoors by an exhaust device. As a result, air flows smoothly through the ventilation layer formed in the steel plate which is installed almost horizontally on the flooring material. Therefore, the building heat shielding structure according to the present invention reduces the load on the building and enables energy saving within the building.

[0011] The heat-shielding structure for buildings according to the present invention can be used by joining steel plates together, and the joints between the steel plates are connected with double-sided tape. Therefore, even inexperienced workers can easily perform the work. Furthermore, the steel plates used to construct the heat-shielding structure for buildings according to the present invention are, for example, 0.5 mm thick, 600 mm wide, 2050 mm long, and weigh 6.45 kg / m 2 By using sheets weighing approximately 8 kg each, they can be transported by small vehicles, and can also be unloaded using elevators. [Brief explanation of the drawing]

[0012] [Figure 1] This is a side cross-sectional view of the heat-shielding structure of the building according to this embodiment. [Figure 2] This is a top view of a building in which the heat-shielding structure of the building according to this embodiment has been constructed. [Figure 3] This diagram illustrates the structure of the air intake of the building's heat-shielding structure according to this embodiment, and shows the building's heat-shielding structure viewed from the right side. [Figure 4] This diagram illustrates the structure of the exhaust vent of the building's heat-shielding structure according to this embodiment, and shows the building's heat-shielding structure viewed from the left side. [Figure 5] This figure illustrates an example of an exhaust system for the heat-shielding structure of a building according to this embodiment, where (a) shows the closed state and (b) shows the open state. [Modes for carrying out the invention]

[0013] The best mode for carrying out the present invention will be described. The heat-shielding structure for buildings of the present invention can be applied to various buildings such as office buildings, houses, and factories. In this embodiment, the building in question is an office building, and the heat-shielding structure for buildings of the present invention will be described.

[0014] The temperature is rising year by year, and the number of days when the temperature exceeds the body temperature is increasing. In ordinary houses, heat insulation and heat-insulating coatings are applied to prevent heatstroke and save energy. However, in concrete buildings such as buildings, due to their high height, large construction costs in urban areas, and the lack of high-performance construction methods, the reality is that they have not been improved much.

[0015] In recent years, the number of disasters has increased, and there is also a risk of earthquakes along the Pacific coast, so the issue of seismic resistance is a concern. It is known that installing another roof on the roof of a building can achieve a significant energy-saving effect. However, it is difficult to increase the strength of concrete buildings like steel-frame structures, and there is also a problem with the increase in weight.

[0016] The roof of a building has the largest heat load and measures need to be taken. However, the location of the building is often on land with a dense population, making it difficult to secure the space required for construction work and requiring large cranes for unloading due to its high-rise nature. There are also problems such as difficult construction and huge costs.

[0017] The heat insulation structure (building heat insulation structure) 1 according to the present invention is formed on the roof of the building 20. As shown in FIGS. 1 to 3, this building heat insulation structure 1 includes facing parapets (wall materials) 21 to 24 protruding upward in the vertical direction Y from the roof of the building 20, a steel plate 2 directly installed on the floor material 25 of the roof and provided with a material (high-reflectivity material) 3 with a high reflectivity to radiant heat such as aluminum foil on the inside, having concave portions 2A and convex portions 2B, a ventilation layer 4 formed between the convex portion 2B of the steel plate 2 and the floor material 25 of the roof, a windstop plate 5 provided in the ventilation layer 4 on the right end (one end) side of the steel plate 2, an intake side cover material 6 attached to the upper part of one end of the steel plate 2 to block the top end 2C of one end of the steel plate 2, an exhaust device 8A attached to the upper part of the left end (the other end) side of the steel plate 2, and an exhaust side cover material 7 attached to the upper part of the exhaust device 8A. In the case where the parapets 21 to 24 are not formed on the building 20, a plate material is provided on the roof of the building 20 and used as a wall material.

[0018] In the building's heat-shielding structure 1, the steel plate 2 is installed at a predetermined distance from the right parapet 21 and the left parapet 22. This creates an intake-side space (first space) S1 between one end of the steel plate 2, the right parapet 21, the intake-side cover material 6, and the floor material 25, and an exhaust-side space (second space) S2 between the other end of the steel plate 2, the left parapet 22, the exhaust device 8A, and the exhaust-side cover material 7. The exhaust-side space S2 is sealed by providing a sealing member 9 that closes the recess 2A at the other end of the steel plate 2. In the building's heat-shielding structure 1 having this configuration, outside air flows into the intake-side space S1 from the recess 2A at one end, and the incoming outside air is drawn into the convex portion 2B (ventilation layer 4) through an intake port 11 formed between the windbreak plate 5 and the floor material 25. The air then passes through the ventilation layer 4 and flows into the exhaust-side space S2 through an exhaust port 12 formed in the convex portion 2B at the other end, as shown in Figure 4. The air that flows into the exhaust space S2 is then discharged outdoors from the exhaust device 8A.

[0019] The heat-shielding structure 1 for a building according to the present invention involves directly placing a heat-shielding steel plate 10 on the roof of a building 20. This heat-shielding steel plate 10 has a material 3 with high reflectivity to radiant heat, such as aluminum foil, directly attached to the inside of a steel plate 2 which has recesses 2A and protrusions 2B, commonly used in steel frame construction. This structure utilizes the low radiance performance of the material 3, which has high reflectivity to radiant heat, such as aluminum foil.

[0020] The heat-insulating steel plate 10 is arranged inside the opposing parapets 21 to 24, leaving a predetermined gap from the parapets 21 and 22 to create a space. An air intake 11 is formed at one end of the steel plate 2, and an exhaust port 12 is formed at the other end. The inside of the convex portion 2B of the heat-insulating steel plate 10 is always a ventilation layer 4 through which air flows. An L-shaped air intake side cover material 6 is installed on the air intake side, and the air intake side cover material 6 is attached to the parapet 21 and the top end 2C of the heat-insulating steel plate 10. Also, the air intake side cover material 6 is provided so as to cover the entire front-rear direction Z of the top end 2C of the right end of the heat-insulating steel plate 10. Therefore, the air intake side cover material 6 serves as a shade so that sunlight does not irradiate the waterproof layer 26 provided on the existing rooftop floor material 25 (Fig. 2). Also, at the right end (air intake side) of the heat-insulating steel plate 10, a gap is formed between the air intake side cover material 6 and the concave portion 2A, and air enters the air intake side space S1 from this gap, passes through the air intake 11, and flows into the ventilation layer 4 of the heat-insulating steel plate 10. On the other hand, an exhaust device 8A is attached onto the steel plate 2 at the left end (exhaust side) of the heat-insulating steel plate 10, and the exhaust device 8A controls the amount of air to be discharged. This exhaust device 8A is provided over the entire front-rear direction Z (Fig. 2). Note that the exhaust device 8A may be provided partially.

[0021] Furthermore, an exhaust side cover material 7 is provided above the exhaust device 8A. This exhaust side cover material 7 is attached to the parapet 22 and the exhaust device 8A. The exhaust side cover material 7 is provided so as to cover the exhaust device 8A and the left end of the heat-insulating steel plate 10 (Fig. 2). The exhaust side cover material 7, similar to the air intake side cover material 6, plays a role of preventing direct sunlight from irradiating the floor material 25. Also, the convex portion 2B at the left end of the heat-insulating steel plate 10 is in an open state, while a blocking member 9 is provided in the concave portion 2A at the left end, and it is sealed so that air cannot enter or exit between the exhaust side space S2 and the outdoors. That is, in the heat-insulating structure 1 of the building, air enters from the air intake 11, passes through the exhaust port 12, and is discharged from the exhaust device 8A to the outdoors (outside). Note that the blocking member 9 only needs to be able to block the entry and exit of air between the exhaust side space S2 and the outdoors from the concave portion 2A, and for example, a sliding door is used as this blocking member 9.

[0022] Generally, rooftops are nearly horizontal, and it seems that the airflow within the protrusions 2B of the steel plate 2 is not fixed in one direction. However, in the heat-shielding structure 1 of the present invention, although air flows within the protrusions 2B (ventilation layer 4) of the steel plate 2, a wind-stopping plate 5 is provided on the intake side with a gap of 20 to 30 mm at the lower end (Figure 3), so that air that has entered the protrusions 2B (ventilation layer 4) is not discharged back to the side from which it entered.

[0023] On the other hand, the ventilation layer 4 on the exhaust side is always open, allowing air to be smoothly discharged into the exhaust side space S2 (Figure 4). That is, if the heat-shielding steel plate 10 overheats and the air expands due to thermal expansion, air will automatically flow into the exhaust side space S2. Furthermore, the reason why air flows easily into the exhaust side space S2 is that a material 3 with high reflectivity to radiant heat, such as aluminum foil, is directly attached to the inside of the exhaust side cover material 7 attached to the top of the exhaust device 8A. By attaching a material 3 with high reflectivity to radiant heat, such as aluminum foil, to the exhaust side cover material 7, the temperature of the exhaust side space S2 can always be kept low, and in accordance with the principle that heat moves from high temperature to low temperature, air can flow smoothly even when the heat-shielding steel plate 10 is horizontal.

[0024] Generally, to allow air to circulate, the roofing material is sloped, and steel frames or similar structures are installed. However, installing steel frames not only makes transportation and lifting difficult, but also raises concerns about increasing the load on the building's roof. In the heat-shielding structure 1 for buildings of the present invention, the heat-shielding steel plate 10 is installed directly on the floor material 25 without using a frame or the like, so the above-mentioned problems do not occur, and the load on the building 20 can be significantly reduced.

[0025] An exhaust device (switching device) 8A is provided on the outdoor side of the heat-shielding steel plate 10 on the exhaust side, and this exhaust device 8A can be equipped with, for example, a device that senses the temperature and automatically adjusts the air inflow and outflow. In the heat-shielding structure 1 of the present invention, a sliding type exhaust device 8A that slides horizontally using a shape memory alloy is used. Because a shape memory alloy is used, no electricity is required at all, and the amount of air vented by the exhaust device 8A can be automatically controlled 24 hours a day, 365 days a year.

[0026] The exhaust device 8A opens and closes when a shape memory alloy senses the ambient temperature. The exhaust device 8A consists of two rectangular slide plates 8D, each having multiple rectangular openings 8C, stacked on a base 8B. A spring 8E (temperature sensing part) made of shape memory alloy senses the temperature and expands and contracts, causing the openings 8C to open and close. Specifically, as shown in Figure 5(a), when it cools, the spring 8E expands, causing the slide plate 8D to move to the right in the left-right direction X, and the opening 8C is closed by the slide plate 8D, resulting in a closed state. On the other hand, as shown in Figure 5(b), when it warms up to a predetermined temperature, the spring 8E contracts, causing the slide plate 8D to move to the left in the left-right direction X, and the opening 8C opens, resulting in an open state. The shape memory alloy used in the exhaust device 8A is a Ni-Ti alloy, and various types can be used. Furthermore, the exhaust device 8A is not limited to a slide-type device using shape memory alloy; it may also be an electrically operated type or an exhaust device that opens and closes vertically.

[0027] The heat-shielding steel sheet 10 can be any type commonly used for steel roofs, and its cross-section can be trapezoidal or semicircular without particular concern. However, from a durability standpoint, galvalume steel sheet (registered trademark) with a lifespan of approximately 30 years is used. Furthermore, since rooftops may be used for people or to mount solar panels, it is preferable to use a material with appropriate strength, but heavy materials cannot be used due to load-bearing limitations. The steel sheet 2 of this invention may be, for example, an 88-fold corrugated sheet with a thickness of 0.5 mm, a height of 88 mm, a width of 600 mm, a length of 2050 mm, and a load of 6.45 kg / m². 2 Approximately 8 kg per sheet can be used.

[0028] The rooftop of building 20 is surrounded by parapets 21 to 24 and is not significantly affected by wind. Therefore, the steel plates 2 are almost always attached to the rooftop waterproofing layer 26 using double-sided tape. Since no holes are drilled in the floor with bolts or anything similar, the existing waterproofing layer 26 is not damaged, and there is no concern about leaks.

[0029] The heat-shielding structure 1 for buildings according to the present invention is based on a ventilated construction method, so the material 3, which has a high reflectivity to radiant heat, such as aluminum foil, must be resistant to atmospheric vibrations, abrasion caused by dust in the atmosphere, and also to acids and alkalis. In this invention, the thickness of the material 3, which has a high reflectivity to radiant heat, such as aluminum foil, is increased and bonded to the steel plate 2 to cope with air vibrations, and furthermore, the surface is treated with an acid and alkali-resistant material. The thickness of a typical heat-shielding material, such as aluminum foil, which has a high reflectivity to radiant heat, used in a static air state is 5 μm to 7 μm. On the other hand, in the heat-shielding structure 1 for buildings according to the present invention, the thickness of the heat-shielding material, such as aluminum foil, which has a high reflectivity to radiant heat, is about 50 μm, and it has 7 to 10 times the strength.

[0030] The heat-shielding steel plate 10 used in the building heat-shielding structure 1 according to the present invention can be cut into short pieces so that it can be transported by hand. Furthermore, the building heat-shielding structure 1 can also be constructed by joining multiple heat-shielding steel plates 10 (steel plates 2) together in the left-right direction X or the front-back direction Z. The joints between the heat-shielding steel plates 10 are connected with double-sided tape.

[0031] Generally, buildings are located in densely populated urban areas and are also very tall. Consequently, transporting and lifting materials incurs enormous costs, and obtaining work permits is also difficult, making it impossible to easily carry out rooftop construction.

[0032] The heat-shielding structure 1 for buildings of the present invention can be constructed by floor-standing installation, so the strength of the roofing material is not particularly required. Therefore, by using heat-shielding steel plates 10 approximately 2m in length, transportation can be done by small vehicles and lifting by elevator, making rooftop construction easy. The heat-shielding steel plates 10 are connected using double-sided tape, making installation easy. Moreover, because it is installed with double-sided tape, even amateurs unfamiliar with construction can install it, addressing the shortage of roof construction technicians and significantly reducing construction costs.

[0033] The heat-shielding structure 1 for buildings according to the present invention will be described in detail.

[0034] High-rise building construction requires large vehicles for transportation and lifting materials, but most buildings are located in densely populated areas where sufficient construction space cannot be secured, and the construction costs are enormous, making it difficult to carry out.

[0035] In the heat-shielding structure 1 of the present invention, a heat-shielding steel plate 10, lined with a material 3 that has a high reflectivity to radiant heat, such as aluminum foil, is directly installed on the flooring material 25 of the rooftop of the building 20. Therefore, a support structure is not required, resulting in a heat-shielding structure 1 that reduces the load on the building. Furthermore, as an even simpler construction method, the materials such as the heat-shielding steel plate 10 required for construction can be transported by small vehicles and even lifted by elevator, making energy-saving construction work possible on high-rise buildings that were previously inaccessible. Moreover, it is a method that can be easily used by laypeople to save energy and improve the indoor environment, and is constructed at a very low cost, thus solving the problems of the past all at once.

[0036] The first key point is the use of heat-shielding steel plates 10 that have been processed to a length that can be lifted by elevator. By using steel plates 2 that are approximately 2 to 3 meters long, they can be transported by small vehicles. For example, if a steel plate 2 with a thickness of 0.5 mm, a height of 88 mm, and a width of 600 mm, known as an 88-fold plate, is cut to 2 meters, it weighs about 7.5 kg, which anyone can easily carry, and 40 plates can be transported in an elevator that can carry 300 kg. Moreover, a major feature is that this can be achieved by one person working alone.

[0037] The second point is that a steel plate 2, with a material 3 that has a high reflectivity against radiant heat, such as aluminum foil, attached to the inside, is installed between opposing parapets 21 and 22, leaving a gap of approximately 30 mm at both ends and installed on the flooring material. In this state, the heat-shielding steel plate 10 is attached and fixed to the waterproof layer 26 of the flooring material with double-sided tape, and adjacent heat-shielding steel plates 10 are overlapped by approximately 30 mm and connected with double-sided tape, allowing for installation without damaging the waterproof layer 26. A major feature is that it can be easily installed even by people who are not professional craftsmen familiar with construction.

[0038] The third point is that although the roof of the building 20 is almost horizontal, a windbreak plate 5 is attached to the protruding portion 2B at the intake end of the heat-shielding steel plate 10 so that a gap of approximately 20 mm to 30 mm (intake port 11) is formed at the bottom, while the protruding portion 2B at the exhaust end is left open. Therefore, in the building's heat-shielding structure 1, once air flows into the ventilation layer 4 from the intake port 11 on the intake side, it can only exit from the exhaust port 12 on the exhaust side. In other words, in the building's heat-shielding structure 1 of the present invention, the protruding portion 2B of the heat-shielding steel plate 10 is used as the ventilation layer 4, and the air flowing through the ventilation layer 4 flows in only one direction. In addition, a sealing member 9 (faceplate) is attached to the recess 2A below the exhaust device 8 and on the exhaust side, creating a structure that prevents air from entering or leaving with the outside (Figure 1).

[0039] The fourth point is that a slide-type exhaust device 8A made of shape memory alloy is attached to the upper part of the exhaust side of the heat-shielding steel plate 10 (steel plate 2). Due to the shape memory alloy, the opening 8C closes completely at an ambient temperature of 18°C ​​and opens completely at 28°C, allowing it to operate 24 hours a day, 365 days a year without electricity, in response to rising ambient temperatures. In summer or on hot days, a lot of air flows through the ventilation layer 4, but as the temperature drops, the amount of air flowing gradually decreases, and at 18°C, air stops flowing completely, resulting in a heat-retaining state.

[0040] The fifth point is that an L-shaped intake-side cover material 6 is attached to the top of the intake-side heat-shielding steel plate 10 (steel plate 2), connecting it to the adjacent parapet, so that no sunlight is irradiated onto the waterproof layer 26. By attaching the intake-side cover material 6, deterioration of the waterproof layer 26 due to ultraviolet rays can be prevented. On the other hand, an L-shaped exhaust-side cover material 7 is attached to the exhaust side, connecting the top of the exhaust device 8A to the adjacent parapet. The inside of this exhaust-side cover material 7 is lined with a material 3 that has a high reflectivity to radiant heat, such as aluminum foil, which suppresses the temperature rise on the indoor side. In other words, it is possible to lower the temperature on the exhaust side, and the air in the ventilation layer 4 inside the heat-shielding steel plate 10 can be exhausted more effectively.

[0041] The sixth point is the use of a material 3 with high reflectivity against radiant heat, such as aluminum foil, specifically designed for ventilation. Generally, materials with high reflectivity against radiant heat, such as aluminum foil, are intended for use in still air and are thin, and are not structured to withstand air vibrations. The material 3 with high reflectivity against radiant heat, such as aluminum foil, used in the building heat shielding structure 1 of the present invention is 7 to 10 times thicker than ordinary products and is directly attached to the inside of the steel plate 2, making it resistant to air vibrations. Moreover, it is structured to withstand air abrasion, even though air contains yellow sand and dust. Furthermore, since it also contains acid and alkaline components, the surface is treated to withstand these.

[0042] Next, we will explain the heat dissipation mechanism in the building's heat-shielding structure 1.

[0043] The heat moving through the building 20 moves from the outside to the inside during summer or high temperatures, and from the inside to the outside during winter or low temperatures. The heat-shielding steel plate 10 has a material 3 with high reflectivity against radiant heat, such as aluminum foil with a reflectivity of approximately 95%, installed on the inside. In summer, it blocks 95% of the radiant heat from the outside, preventing heat from entering the room, and in winter, it reflects 95% of the radiant heat moving from the inside to the outside back into the room. When the temperature rises, the temperature of the heat-shielding steel plate 10 rises, and the air inside the heat-shielding steel plate 10 expands. As a result, the air moves to the exhaust port 12, which is cooler and has less resistance, rises in the exhaust-side space S2, and is released from the exhaust device 8A. On the other hand, on the intake side, as if pulled by this, the outside air flows into the intake-side space S1 from the recess 2A, passes through the intake port 11 formed on the lower side of the wind-stopping plate 5, and moves to the ventilation layer 4. On the other hand, when the temperature is 18°C ​​or lower, the exhaust device 8A is closed, so no air moves within the ventilation layer 4, resulting in a completely heat-retaining state. By repeating this process, energy consumption within the building 20 can be reduced by approximately 50%.

[0044] [Comparison with roof waterproofing repair costs] The cost of waterproofing repairs on a rooftop varies depending on the method used, but it will generally be necessary twice within the next 30 years. The heat-shielding structure for buildings according to the present invention can be made of galvalume steel sheets (registered trademark) with a lifespan of 30 years, thus eliminating maintenance costs. These costs are negligible for an area of ​​100m². 2 We assumed the following and compared the results. The results of the comparison are shown in Table 1.

[0045] [Table 1] TIFF0007847904000002.tif50156

[0046] [Consideration 1] (i) Although this construction method is for new construction, the cost is not significantly different from the cost of two other renovation projects. Moreover, although not shown here, it can achieve a 50% energy saving, so the difference is very substantial. (b) Although improvements to the indoor environment cannot be expressed numerically, it is thought that they can greatly improve measures against heatstroke.

[0047] Next, the effects and benefits of the heat-shielding structure 1 of the building according to this embodiment will be explained.

[0048] In the heat-shielding structure 1 of the building according to this embodiment, a heat-shielding steel plate 10 with a material 3 that has a high reflectivity to radiant heat, such as aluminum foil, directly attached to the inside is placed directly on the roof, and the material 3 with high reflectivity to radiant heat is exposed to the ventilation layer 4. Therefore, the low radiation performance of the material (heat-shielding material) 3 with high reflectivity to radiant heat, such as aluminum foil, can be utilized as is, and energy savings of approximately 50% can be achieved for the building.

[0049] By appropriately designing the size of the heat-shielding steel plate 10 used in the heat-shielding structure 1 of the building according to this embodiment, transportation to the building and unloading to the rooftop can be made easier. As a result, heat-shielding work on the rooftops of high-rise buildings, which was previously impossible, can be easily carried out, and the indoor environment of the building 20 can be significantly improved by constructing the heat-shielding structure 1 of the building.

[0050] While rooftop waterproofing repairs have traditionally been carried out every 10 years, constructing the building's heat-shielding structure 1 according to the present invention on the roof of building 20 eliminates the need for such repairs, resulting in significant cost savings. [Explanation of symbols]

[0051] 1. Heat-shielding structure of buildings 2 steel plate 2A Recess 2B protrusion 2C Top surface 3. Materials with high reflectivity against radiant heat, such as aluminum foil (heat shielding materials) 4. Ventilation layer 5 Windstop plate 6. Intake side cover material 7. Exhaust side cover material 8A Exhaust system (switching device) 8B base 8C opening 8D sliding plate 8E Spring (temperature sensing part) 9. Sealing member 10 Heat-shielding steel plate 11 Air intake 12 Exhaust vents 20. Buildings 21-24 Parapet (wall material) 25 Flooring 26 Waterproof layer S1 Intake side space (first space) S2 Exhaust side space (second space) X Left / right direction Y vertical direction Z front and back direction

Claims

1. A heat-shielding structure for a building formed on the roof of a building, Opposing wall materials positioned projecting upward from the rooftop of the aforementioned building, The aforementioned rooftop flooring material is directly installed, and a material with high reflectivity against radiant heat, such as aluminum foil, is provided on the inside, and the steel plate has recesses and protrusions. A ventilation layer is formed between the protrusion of the steel plate and the flooring material of the roof, A windbreak plate is provided in the ventilation layer on one end side of the steel plate, An intake-side cover material is attached to the upper part of one end of the steel plate and closes the top surface of one end of the steel plate, An exhaust device attached to the upper part of the other end of the steel plate, The exhaust device comprises an exhaust-side cover material attached to the upper part of the exhaust device, The steel plate is installed at a predetermined distance from the opposing wall material, thereby forming a first space enclosed by one end of the steel plate, one of the wall materials, the intake-side cover material, and the floor material, and a second space enclosed by the other end of the steel plate, the other wall material, the exhaust device, and the exhaust-side cover material. By providing a sealing member to close the recess at the other end of the steel plate, the second space is sealed. Outside air flows into the first space from the recess on one end, the incoming outside air is drawn into the protrusion through an air intake formed between the windbreak plate and the flooring material, passes through the ventilation layer, flows into the second space through an exhaust port formed in the protrusion on the other end, and is discharged to the outside from the exhaust device. A heat-shielding structure for buildings characterized by the following features.

2. Multiple steel plates are joined together to form the structure, and the joints between the steel plates are connected with double-sided tape. The heat-shielding structure for a building according to feature 1.

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