Structure for rooftop installation of solar power generation panels

Abstract

To provide a structure for mounting a photovoltaic power generation panel that is allowed to mount the photovoltaic power generation panel on roofs of various buildings without using beam-like members.SOLUTION: A structure for mounting photovoltaic power generation panels on a roof of a building has a plurality of button-shaped protrusion parts composed of top surface parts and side surface parts that surround the periphery of the top surface parts and extend downward from the top surface parts to abut their lower edges onto a top surface of the roof. Each top surface part of the protrusion parts is configured to abut and fix plural portions at a bottom surface of the photovoltaic power generation panel. Each of the protrusion parts may be placed on a thin plate-like member adhered onto the top surface of the roof.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure for installing a solar power generation panel in which solar cell modules are arranged on a plate-like panel member, and more particularly to a structure for installing a solar power generation panel on the roof of a building.

Background Art

[0002] With the spread of solar power generation, solar power generation panels are being arranged in various places, such as on the roofs of buildings and moving objects irradiated with sunlight. Along with this, various configurations of structures for installing solar power generation panels have been proposed. For example, Patent Document 1 discloses a configuration in which a lightweight and impact-resistant solar cell panel is placed on a beam placed on a roof. In Patent Document 2, the solar cell module has a long shape parallel to the outer edge of the solar cell panel so as to have load-bearing properties suitable for the situation of the installation location, includes side portions erected on the side of the outer edge, and a holding frame that holds the outer edge of the solar cell panel, and a reinforcing component that is detachably fitted to the holding frame on the side of the solar cell panel rather than the side portions to reinforce the holding frame, and a beam-shaped support rack arranged on the bottom side of the solar cell module and placed on the roof is engaged with the holding frame by a fixing metal fitting via the reinforcing component. Patent Document 3 discloses a configuration of a solar cell module in which a vertical bar, which is a support for supporting a frame that holds the outer edge of the solar cell panel and the solar cell panel, is placed on the roof, and a fixing metal fitting, which is a fixing component for fixing the frame to the vertical bar, can slide in a state of being fitted along a rail groove provided in the frame when removed from the vertical bar, and the frame can be easily fixed to the support regardless of its height. And Patent Document 4 discloses a configuration in which, when installing a solar cell module on the roof of a building using a lightweight cellular concrete (ALC) panel as a roofing material, a column is erected on a beam supporting the ALC panel, and a crossbar to which the solar cell module is fixed is arranged thereon.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] As disclosed in the prior art documents as described above, when a solar power generation panel is installed on the roof of a building, typically, a pedestal (hereinafter referred to as a "beam pedestal") composed of several beam - shaped or frame - shaped members is arranged at the installation site, and a plate - shaped solar power generation panel is placed thereon. In the case of such a beam pedestal, the load acts intensively on the contact parts of the beam - shaped or frame - shaped members of the pedestal on the installation surface on the roof. Therefore, when arranging a beam pedestal on the roof of a building, it is necessary to consider the constraints on the strength and weight of each part of the roof. Thus, the beam - shaped or frame - shaped members of the pedestal cannot be arranged anywhere on the roof. For example, in the case of a pitched roof made of relatively low - strength foamed concrete, a load cannot be applied to parts other than the upper surface of the location where the beam supporting the roof panel extends. Therefore, when attempting to install a solar power generation panel on such a roof, only a pedestal with the interval of the beam - shaped or frame - shaped members matching the interval of the beams supporting the roof panel can be used. In that case, it has not always been possible to configure the pedestal so that the installation strength of the solar power generation panel is optimal.

[0005] In addition, in a configuration where a solar power generation panel is installed on the roof of a building using a beam-shaped gantry as described above, the point of action where the external force received by the solar power generation panel from wind, rain, and snow acts on the members of the beam-shaped gantry, and the support points where the members of the beam-shaped gantry are supported on the roof surface do not necessarily coincide. In that case, the bending moment at approximately the center between the support points of the members of the beam-shaped gantry becomes high. More specifically, as shown in FIG. 5(A), when considering a configuration in which a beam-shaped member F of a beam-shaped gantry is supported at a support point C on a roof surface R and a solar power generation panel PVP is fixed at a fixed point S on the beam-shaped member F, when there is snow accumulation, a pressure P acts downward on the solar power generation panel, and when the wind blows, a pressure P acts upward on the solar power generation panel. In that case, if the support point C of the beam-shaped member F on the roof surface R and the point of action S of the external force from the solar power generation panel are displaced as shown in the figure due to the strength of the roof surface R, as shown in FIG. 5(B), the bending moment M generated in the beam-shaped member F becomes high at approximately the midpoint between adjacent support points C. Then, in the beam-shaped or frame-shaped members of the gantry, the portion where such a high bending moment acts needs to be formed to have a high-rigidity cross-section to resist it. However, since it is difficult to form a part of the beam-shaped or frame-shaped members with a thick wall, the entire beam-shaped or frame-shaped members are formed with a thick wall, and accordingly, the weight of the gantry increases. Eventually, a situation occurs where the combined weight of the solar power generation panel and the gantry exceeds the weight that can be placed on the roof, and the solar power generation panel cannot be installed on the roof.

[0006] Alternatively, in order to reduce the weight placed on the roof of the building, it may be considered to directly attach the solar power generation panel to the roof. However, the maintenance of the roof and the solar power generation panel may become difficult, such as when the service life of the roof and the service life of the solar power generation panel are different.

[0007] Thus, in view of the above circumstances when installing a solar power generation panel using a beam-shaped gantry as described above, the main problem of the present invention is to provide a structure for installing a solar power generation panel that enables the installation of a solar power generation panel on the roofs of various buildings without using a beam-shaped gantry.

Means for Solving the Problem

[0008] According to the present invention, the above problems are solved by a structure for installing a solar power generation panel on the roof of a building, having a plurality of button-shaped protrusions each comprising an upper surface portion and a side surface portion surrounding the periphery of the upper surface portion and extending downward from the upper surface portion so that the lower end edge abuts against the upper surface of the roof, and the upper surface portion of each of the protrusions is configured to abut against and be fixed to each of a plurality of portions on the bottom surface of the solar power generation panel. This is achieved by

[0009] In the above, the "solar power generation panel" may be a panel on which a solar cell module in which a plurality of solar cells are arranged in parallel on a plate-shaped panel member is placed, as already mentioned. Each of the solar cells generally has a substantially rectangular plate shape, and the shape of the solar power generation panel may be a substantially rectangular flat plate shape in which the solar cells are arranged vertically and horizontally, but is not limited thereto. The "button-shaped protrusion" may be a portion or region having a shape in which the horizontal cross section is substantially circular or polygonal and protruding upward from the lower end edge. And in the present invention, the upper surface portion of each of the protrusions abuts against and is fixed to each of a plurality of portions on the bottom surface of the solar power generation panel. The fixing portions on the bottom surface of the solar power generation panel may preferably include the edge portions of the solar power generation panel. The number of protrusions in the structure may be appropriately selected. The contact positions of the protrusions on the bottom surface of the solar power generation panel may be appropriately selected from a plurality of portions at appropriate intervals along the edge of the solar power generation panel and any portion inside such edge. The solar power generation panel will be placed on the button-shaped protrusions appropriately arranged on the upper surface of the roof. The horizontal size of the protrusion may be determined by adaptation. The protrusion may be formed of a thin and lightweight metal material, plastic material, or the like.

[0010] In the structure for installing the solar power generation panel according to the present invention described above, instead of arranging a beam-shaped or frame-shaped member on the upper surface of the roof like a conventional beam-shaped gantry, button-shaped protrusions are arranged at appropriate intervals, and the solar power generation panel is abutted and fixed on the upper surfaces of these protrusions. According to such a configuration, at each protrusion, the position of the part fixed to the solar power generation panel, that is, the action point of the external force transmitted from the solar power generation panel to the protrusion, and the part in contact with the roof surface, that is, the support point that supports the protrusion on the roof surface, are substantially the same on the horizontal plane. Therefore, unlike the case of the beam-shaped or frame-shaped member of the beam-shaped gantry, there is no need to increase the wall thickness of the member in preparation for a high moment due to the deviation between the action point of the external force and the support point, and the entire structure can be appropriately lightened. It is expected that the number of roof shapes and types on which the solar power generation panel can be placed will increase, even for roofs where it is difficult to place a beam-shaped gantry.

[0011] The number of the above-mentioned protrusions may be adjusted according to their weight. Typically, the inside of the upper surface portion and the side surface portion of the protrusion may be hollow. In that case, the shape of the protrusion is the shape in a state where a cup is arranged with its opening side facing downward, and it is expected that the load acting on the upper surface portion will be uniformly distributed to the surrounding side surface portion, and a high rigidity strength can be obtained with a light weight. (In the case of such a configuration, as will be described later, between adjacent protrusions on the roof surface, a hollow box-shaped structure with a substantially rectangular cross section is formed by the bottom surface of the solar power generation panel, the roof surface facing it, and the side surface portions of the protrusions connecting them on both sides. Therefore, the structure is lightweight, and a high support function is provided against the external force acting vertically on the upper surface portion (the solar power generation panel portion) of the box-shaped structure due to wind and snow.) Also, in this case, since the weight of each protrusion can be reduced, the number of protrusions can be increased accordingly, and the solar power generation panel can be supported more stably.

[0012] The structure according to the present invention described above has a thin plate-like member adhered to the upper surface of the roof, and each of the protrusions may be arranged on the thin plate-like member. For example, in the case of a flat roof made of foamed concrete briefly mentioned above, where the sites where a locally high load can act are limited to specific sites, when a thin plate-like member is adhered over a wide range on the upper surface of the roof and protrusions for supporting a solar power generation panel are arranged on such a thin plate-like member, the load transmitted from the solar power generation panel to the roof is dispersed over the entire thin plate-like member. Therefore, it becomes possible to install a solar power generation panel even on a roof where the sites where a locally high load can act are limited. The thin plate-like member may be formed of a thin and lightweight metal material, plastic material, or the like. The thin plate-like member may be adhered to the roof surface by any method, for example, using an adhesive.

[0013] In addition, in the case of the configuration having the above-described thin plate-like member, the protrusion may be formed separately from the thin plate-like member and joined to the thin plate-like member in any manner. However, when the thin plate-like member is a metal thin plate, the protrusion may be formed in the thin plate-like member by press working. In that case, the number of parts is reduced and it becomes possible to easily manufacture the structure. Also, when the protrusion is formed in the thin plate-like member by press working, since the positioning of the protrusion is completed just by arranging the thin plate-like member, there is also an advantage that the laying process of the solar power generation panel can be simplified. Note that the configuration in which the protrusion protrudes from the thin plate-like member may also be configured by molding a plastic material, and in that case, it also belongs to the scope of the present invention.

[0014] In the above configuration, the attachment of the photovoltaic panel to the protrusion may be achieved, for example, using fasteners such as bolts. In this regard, the photovoltaic panel placed on the above-described structure of the present invention generally has a plurality of solar cell units aligned and juxtaposed on the panel. However, it is not preferable to drill holes or the like for attaching bolts or the like for fixing the protrusion to the solar cell unit itself. Further, if a single protrusion can support a plurality of adjacent solar cell units, the number of protrusions formed or installed on the structure can be reduced, and the process of fixing the photovoltaic panel to the structure can be simplified. Therefore, in the above-described structure of the present invention, the upper surface portion of the protrusion may be fixed between the corners of two or four adjacent solar cell units juxtaposed on the photovoltaic panel (the portion of the plate-shaped panel member) that are close to each other, thereby avoiding the fixing portion from the solar cell unit itself and enabling each protrusion to hold a plurality of solar cell units simultaneously.

[0015] Incidentally, when a photovoltaic panel is installed on a roof, often the orientation of the photovoltaic panel is inclined so that the light-receiving surface of the photovoltaic panel is as close as possible to being perpendicular to the traveling direction of sunlight. Therefore, also in the above-described structure of the present invention, the surfaces of the upper surface portions of the plurality of protrusions may be inclined with respect to the upper surface of the roof so as to incline the extending direction of the photovoltaic panel with respect to the upper surface of the roof. According to such a configuration, it becomes possible to achieve the adjustment of the orientation of the photovoltaic panel while placing it on the protrusion of the structure of the photovoltaic panel, and the installation work on the roof is simplified.

Advantages of the Invention

[0016] Thus, according to the present invention described above, by appropriately arranging button-shaped protrusions on the roof surface and disposing a solar power generation panel thereon, the solar power generation panel can be installed on the roof without using a beam-shaped gantry. According to such a configuration, it becomes possible to install solar power generation panels on various roofs where it was difficult to use a beam-shaped gantry, and the types and shapes of roofs on which solar power generation panels can be installed are diversified. In particular, in the case of a mode in which a thin plate-like member is placed on the roof surface and protrusions are formed thereon, it is possible to install a solar power generation panel even on a pitched roof made of foamed concrete on which a solar power generation panel could not be installed conventionally.

[0017] Other objects and advantages of the present invention will become apparent from the following description of the preferred embodiments of the present invention.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Explanation of Signs

[0019] 1... Structure for installing solar power generation panel, 2... Solar power generation panel, 3... Solar cell, 3a... Panel fastening part, 4... Protrusion, 4a... Upper surface part of protrusion, side surface part of protrusion, 5... Thin plate-like member, R... Roof surface of building

Best Mode for Carrying Out the Invention

[0020] The present invention will be described in detail with respect to several preferred embodiments with reference to the accompanying drawings below. In the drawings, the same reference numerals indicate the same parts.

[0021] Basic configuration of the structure for installing a solar power generation panel As schematically depicted in FIGS. 1(A) to 1(G), in a structure 1 (hereinafter referred to as the "structure") for installing a solar power generation panel 2 on a roof surface, basically, on the roof surface R, a plurality of button-shaped protrusions 4 are provided. That is, the upper surface portion 4a thereof is substantially circular (it may also be rectangular), and a portion or region having a shape that extends downward from the upper surface portion 4a to surround it and whose lower end edge abuts against the roof surface R is juxtaposed at appropriate intervals. As shown in FIGS. 1(C) and 1(D), the solar power generation panel 2 is placed and fixed on the upper surface portions 4a of these protrusions 4. According to such a configuration, it is expected that even on a roof of a type where it is difficult to install a conventional beam-shaped gantry, if it is a structure with the above-described configuration, the solar power generation panel 2 can be installed, and it becomes possible to increase the types of roofs on which the solar power generation panel 2 can be installed.

[0022] In such a configuration, when fixing the solar power generation panel 2 to the upper surface portion 4a of the protrusion 4, for example, as depicted in FIG. 1(E), fastening tools 3a such as bolts 6 that penetrate the solar power generation panel 2 and are fastened to the upper surface portion 4a may be preferably used. Regarding this point, in the solar power generation panel 2, as shown in the figure, a plurality of solar cells 3 are juxtaposed. Since it is not preferable to attach the fastening tool 3a through these solar cells 3, the fastening tool 3a may be provided between the edges or corners of adjacent solar cells 3. According to such a configuration, one protrusion 4 will support two or four solar cells 3, which is also advantageous in terms of saving the number of protrusions 4 and reducing the total weight of the structure. In an embodiment, specifically, as shown in the figure, when the square solar cells 3 are aligned vertically and horizontally in the solar power generation panel 2, the fastening tool 3a may be provided at every other one of the juxtaposed solar cells 3 along the edge of the solar power generation panel 2, and inside the solar power generation panel 2, it may be provided at a substantially central portion where the corners of the four solar cells 3 meet, but it is not limited thereto.

[0023] Configuration in which the protrusion is formed on the thin plate-like member In one aspect, the protrusion 4 in the structure 1 of the above-described embodiment may be formed on a thin plate-like member 5 adhered to the roof surface R as shown in the drawing. The thin plate-like member 5 may be formed of a thin and lightweight metal material, plastic material, etc., and may be adhered to the roof surface R by any method, for example, using an adhesive. According to such a configuration, the load transmitted from the solar power generation panel 2 to the roof surface R is dispersed over the entire surface of the thin plate-like member 5 in contact with the roof surface R, so that there is no occurrence of a site or region where the load locally concentrates and acts on the roof surface R as in the case of the beam-like gantry. Thus, by using the structure according to this embodiment having the thin plate-like member 5, it is possible to install the solar power generation panel 2 even on a roof of a type where the sites where a locally high load can act are limited to specific sites, such as a flat roof made of foamed concrete. In this configuration, at each protrusion 4, the position of the action point of the external force transmitted from the solar power generation panel 2 and the position of the support point that supports each protrusion 4 on the roof surface R are substantially the same on the horizontal plane. Therefore, in the portion of the thin plate-like member 5 between adjacent protrusions 4, a high moment due to the deviation between the action point and the support point of the external force does not act, and the thin plate-like member 5 does not need to be thickened in preparation for a high moment as in the case of the beam-like or frame-like member of the beam-like gantry, and the entire structure 1 can be appropriately lightened.

[0024] The configuration in which the protrusions 4 are arranged on the above-described thin plate-like member 5 typically involves subjecting the thin plate-like material that is the basis of the thin plate-like member 5 to press working so that, as depicted in FIG. 1(B), a part of the thin plate-like material 5 protrudes to form a plurality of protrusions 4. According to such a method, the number of parts for constructing the structure 1 can be reduced, and the structure 1 can be easily fabricated. Also, when installing the structure 1 on the roof surface R, it is not necessary to position each of the plurality of protrusions 4, which is advantageous in that the installation process of the structure 1 on the roof becomes simple.

[0025] Further, as another aspect, the protrusion 4 and the thin plate-like member 5 may be formed separately. In one aspect, as shown in Fig. 2(A), the protrusion 4 is arranged, and then, as shown in Fig. 2(B), the upper thin plate member 5 with an opening at the position of the protrusion 4 is arranged, and the opening edge of the upper thin plate member 5 and the lower edge of the protrusion 4 are joined to form the structure 1 as depicted in Fig. 2(D). Alternatively, in another aspect, as shown in Fig. 2(C), the protrusion 4 is arranged and joined on the upper thin plate member 5 (which may not have an opening) to form the structure 1 as depicted in Fig. 2(D). In any of the above aspects, the joining of the protrusion 4 to the thin plate-like member 5 may be carried out on the roof surface R. According to such a configuration, when working on the roof surface R, it is advantageous in that it is easy to avoid protrusions such as water intakes on the roof surface R, and to cope with changes in the dimensions of the photovoltaic panel 2 or changes in the arrangement positions of the solar cells, such as immediately changing the shape of the structure 1 on the spot.

[0026] Inclination of the upper surface of the protrusion When installing the solar power generation panel 2 on the roof surface R, often the solar power generation panel 2 is installed with its surface inclined with respect to the roof surface R so that the light-receiving surface of the solar power generation panel 2 faces the direction of the sun as much as possible. Therefore, also in this embodiment, the surface direction of the upper surface portion of the protrusion 4 for fixing the solar power generation panel 2 is inclined with respect to the roof surface R, and the protrusion 4 may be formed such that the height of the adjacent protrusions 4 gradually increases or decreases along a certain direction. Specifically, as can be understood from FIGS. 1(B)-(D) and FIGS. 1(G), the height of the protrusions 4 aligned on the roof surface R gradually increases and decreases from one edge of the solar power generation panel 2 to the other edge, and the protrusion 4 may be formed such that the surface of the upper surface portion 4a of the protrusion 4 is inclined at the same angle as the inclination when the solar power generation panel 2 is placed thereon. According to such a configuration, in the installation work of the solar power generation panel 2 on the roof surface R, it becomes easy to adjust the inclination angle of the solar power generation panel 2. In the illustrated example, in FIG. 1(G), in the column of the protrusions 4 from top to bottom, the central protrusion 4 is the highest, and the height of the protrusions 4 decreases toward the upper and lower sides, and the solar power generation panel 2 is inclined so that the center is high and the sides are low. However, it is not limited to this, and the actual inclination angle may be appropriately changed according to the installation position of the solar power generation panel 2 on the roof surface R, and such a case also belongs to the scope of this embodiment.

[0027] Regarding the strength of the structure The protrusion 4 in the structure 1 of the above-described embodiment may be solid, but typically, as can also be understood from FIG. 1(B), it may be hollow. Further, when the protrusion 4 is hollow, in order to make its strength higher and not easily crushed, etc., the side surface portion 4b surrounding the upper surface portion 4a in the protrusion 4 is preferably formed so as to surround the upper surface portion 4a over the entire circumference.

[0028] Regarding this point, as schematically depicted in FIG. 3(A), in the structure 1 of the present embodiment, with the solar power generation panel 2 placed thereon, between two adjacent protrusions 4, a substantially rectangular box structure X is formed by the opposing roof surface R, the solar power generation panel 2, and the side surface portions 4b of the opposing protrusions 4. In such a configuration, as shown in FIG. 3(B), when a load Φ acts vertically on the solar power generation panel 2 due to snowfall, rainfall, wind, etc., if the side surface portion 4b of the protrusion 4 buckles (z) and a displacement δ occurs where the upper surface portion tilts, a tension τ is generated in the solar power generation panel 2 in a direction resisting the displacement δ, thereby preventing the buckling of the side surface portion 4b. That is, in the present embodiment, as described above, by forming a substantially rectangular box structure X between two adjacent protrusions 4, it is lightweight and high support performance against external forces due to snowfall, rainfall, and wind is obtained.

[0029] Also, as described above, the protrusion 4 in the structure 1 of the present embodiment may be hollow and is configured to be relatively lightweight. Therefore, in order to enhance the support function of the solar power generation panel 2, the number of protrusions 4 in the structure 1 may be appropriately increased, and the fixing points of the solar power generation panel 2 may be increased. For example, when the protrusion 4 is formed by press working from a thin plate member, the weight does not change even if the number of protrusions 4 increases.

[0030] Examples Regarding the solar power generation panel placed on the structure 1 according to the present embodiment, the stress distributions generated in the solar power generation panel when a positive pressure (load from top to bottom) acts and when a negative pressure (load from bottom to top) acts were evaluated using the finite element method. The positive pressure acts when there is snow accumulation on the solar power generation panel, and the negative pressure acts when wind blows in the vicinity of the solar power generation panel.

[0031] In the evaluation of the stress distribution, the solar power generation panel 2 was made by laminating and heat-fixing a gallium steel plate (registered trademark): thickness 0.4 mm, an ionomer: thickness 0.8 mm, a single-crystal silicon cell (solar cell): thickness 0.18 mm, an ionomer: thickness 0.4 mm, and an ETFE film: thickness 0.05 mm in this order. The structure 1 was formed with protrusions 4 by press working so that the protrusions 4 were arranged vertically and horizontally in the arrangement exemplified in FIGS. 1(A) to (G) with a gallium steel plate (registered trademark): thickness 0.27 mm. The structure 1 was adhesively fixed to the pitched roof, and the solar power generation panel 2 was placed on the upper surface of each of the protrusions 4 of the structure 1 and fixed using M5 tapping screws. Regarding the fixing positions of the solar power generation panel 2 (the positions of the circles in FIG. 1(F)), as shown in the figure, in a configuration where 10 solar cells 3 are juxtaposed in 2 rows on one solar power generation panel 2, at the edge of the panel 2, including the four corners of the panel 2, fixing positions were provided at the corners of every other cell, and between the two rows of cells, fixing positions were provided at positions on the diagonal line of the fixing positions at the edge of the panel 2. (The panel 2 was fixed to the structure 1 at five positions, namely the four corners and the center, of each set of 4 cells in 2 rows and 2 columns starting from one end of the panel 2.) In FIGS. 1(C) to (F), two panels 2 are placed on the structure 1. The size of one cell is 156×156 mm, the size of the panel 2 is 1650×360 mm, the inclination angle of the panel in the short side direction with respect to the roof surface is 6°, and the height from the roof surface to the highest position of the panel 2 (on the central axis of the structure 1) was assumed to be 50 mm. With this configuration, the designed weight of the panel 2 is 7500 g / m 2 Then, in the calculation of the stress distribution, the stress distributions generated in the panel 2 in a state where positive pressure and negative pressure were respectively applied at a standard load capacity of ±2400 Pa were calculated using the finite element method.

[0032] Figures 4(A) and (B) respectively show the stress distributions obtained when positive pressure and negative pressure are applied to panel 2. In the figure, (as shown in Figure 4(C)), the occupied area of the solar cell 3 is depicted by the upper semi-transparent image, and the magnitude of the stress σ is depicted by the lower opaque image. According to the calculation results, where the breaking strength of the solar cell is 80 MPa, the maximum value of the principal stress of the cell is 60 MPa in the case of Figure 4(A) (positive pressure) and 65 MPa in the case of Figure 4(B) (negative pressure). (The maximum stress is greater when negative pressure acts.) Therefore, in the above configuration, it is shown by calculation that the solar cell does not break even when the standard load-bearing capacity of the panel of ±2400 Pa acts.

[0033] Thus, according to the present embodiment, a structure is provided that can install a solar power generation panel on a roof without using a conventional beam-shaped gantry. According to such a configuration, even on a type of roof where it is difficult to install a solar power generation panel when using a beam-shaped gantry, for example, a flat roof made of foamed concrete, etc., it becomes possible to install a solar power generation panel, and an expansion of the types of roofs of buildings where a solar power generation panel can be installed is expected.

[0034] The above description has been made in relation to the embodiments of the present invention, but many modifications and changes are easily possible for those skilled in the art, and the present invention is not limited only to the embodiments illustrated above, and it will be apparent that it can be applied to various devices without departing from the concept of the present invention.

Claims

1. A structure for installing a photovoltaic panel on the roof of a building, comprising: a plurality of button-shaped protrusions each having an upper surface portion and a side surface portion surrounding the periphery of the upper surface portion and extending downward from the upper surface portion, the lower end edge of which abuts against the upper surface of the roof; a structure configured such that the upper surface portion of each of the protrusions abuts against and is fixed to each of a plurality of portions on the bottom surface of the photovoltaic panel; a structure in which the plurality of protrusions are arranged at positions abutting against each of a plurality of spaced-apart portions along the edge of the photovoltaic panel and a portion inside the edge of the photovoltaic panel, and the upper surface portion of the protrusion is fixed between the corners of two or four adjacent solar cells juxtaposed on the photovoltaic panel.

2. The structure according to Claim 1, further comprising a thin plate-like member adhered to the upper surface of the roof, wherein each of the protrusions is disposed on the thin plate-like member.

3. The structure according to Claim 2, wherein each of the protrusions is formed by pressing the thin plate-like member.

4. The structure according to Claim 1, wherein the surfaces of the upper surface portions of the plurality of protrusions are inclined with respect to the upper surface of the roof so as to incline the extending direction of the photovoltaic panel with respect to the upper surface of the roof.

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