Roof structure

Abstract

To provide a technique for a roof structure, comprising an annular fan-shaped roof part formed in an annular fan shape in plan view and a support part supporting the annular fan-shaped roof part, that can rationally suppress bending stress of the annular fan-shaped roof part and deformation of a tip part while allowing a lower space radially inside the annular fan-shaped roof part to have a superior sense of openness by supporting the annular fan-shaped roof part in a cantilever manner only radially outside the annular fan shape.SOLUTION: An annular fan-shaped roof part 10 has a plurality of main beams 12, extending with a predetermined roof gradient along a radial direction X of an annular fan shape, side by side in a circumferential direction Y of the annular fan shape, and the support part 30 is configured to support the plurality of main beams 12 of the annular fan-shaped roof part 10 in a cantilever manner outside in the radial direction X of the annular fan shape. The annular fan-shaped roof part 10 has an inner arc beam 14 which extends in a substantially arc shape along an edge part in the radial direction X of the annular fan shape and to which respective inside end parts of the plurality of main beams 12 are connected, and a brace 20 installed between adjacent ones of the plurality of main beams 12.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a roof structure including an annular sector-shaped roof portion configured in an annular sector shape in plan view and a support portion that supports the annular sector-shaped roof portion.

Background Art

[0002] A roof structure including an annular sector-shaped roof portion configured in an annular sector shape in plan view and a support portion that supports the annular sector-shaped roof portion is known (see, for example, FIG. 2 of Patent Document 1). In the roof structure described in Patent Document 1, the annular sector-shaped roof portion is supported by the support portion on both sides of the outer side and the inner side in the radial direction of the annular sector.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the lower space of the annular sector-shaped roof portion, the inner side in the radial direction of the annular sector is narrower than the outer side in the radial direction. Therefore, if a support portion for supporting the annular sector-shaped roof portion is installed in the lower space on the inner side in the radial direction, there is a problem that the space becomes cramped and the sense of liberation is impaired. Therefore, it is conceivable to support the annular sector-shaped roof portion in a cantilever manner only on the outer side in the radial direction of the annular sector. However, depending on the cantilever support configuration, bending stress generated in the support portion of the annular sector-shaped roof portion and deflection of the tip portion become problems. And if the annular sector-shaped roof portion itself and its support portion are made very strong and have a large cross-section in order to suppress such bending stress and deflection of the tip portion, cost increase and reduction of the lower space become problems. In view of these circumstances, the main objective of the present invention is to provide a roof structure comprising an annular fan-shaped roof section configured in a plan view and a support section that supports the annular fan-shaped roof section, in which the annular fan-shaped roof section is cantilevered only on the radially outer side of the annular fan, thereby providing a sense of openness in the lower space on the radially inner side of the annular fan-shaped roof section, while rationally suppressing bending stress and deflection at the tip of the annular fan-shaped roof section. [Means for solving the problem]

[0005] The first characteristic configuration of the present invention is a roof structure comprising an annular fan-shaped roof section configured in an annular fan shape in plan view, and a support section that supports the annular fan-shaped roof section, The annular fan-shaped roof section has a plurality of main beams arranged in parallel in the circumferential direction of the annular fan, extending in the radial direction of the annular fan with a predetermined roof slope, The support portion is configured to cantilever support the multiple main beams of the annular fan-shaped roof portion on the radially outer side of the annular fan shape. The annular fan-shaped roof section comprises an inner arc beam that extends in a substantially arc shape along the radial inner edge of the annular fan and to which the inner ends of each of the multiple main beams are connected, and braces that are installed between adjacent multiple main beams. death, The roof slope is an inward downward slope that descends from the radially outer side of the annular fan shape toward the radially inner side of the annular fan shape. It is located at the point.

[0006] In the following explanation, the radial direction of the above-mentioned annular sector may be simply referred to as the "radial direction," and the circumferential direction of the above-mentioned annular sector may be simply referred to as the "circumferential direction." In this configuration, in the annular fan-shaped roof section, multiple main beams are arranged in a circumferential direction, and these multiple main beams are cantilevered on the radially outward side by the support structure. This makes the lower space on the radially inner side of the annular fan-shaped roof section feel more open and free from the presence of the support structure. Furthermore, in the annular fan-shaped roof section described above, each of the multiple main beams is cantilevered along the radial direction by a support section, extending from the outside inward with a predetermined roof slope, and the inner arc beam and brace are provided. This allows the bending stress and deflection occurring in the main beams to be effectively resisted by the axial force of the inner arc beam through the brace. Accordingly, the present invention provides a roof structure comprising an annular fan-shaped roof section configured in a plan view and a support section that supports the annular fan-shaped roof section, in which the annular fan-shaped roof section is cantilevered only on the radially outer side of the annular fan, thereby providing a sense of openness in the lower space on the radially inner side of the annular fan-shaped roof section, while rationally suppressing bending stress and deflection at the tip of the annular fan-shaped roof section.

[0008] Furthermore, In this configuration, in the annular fan-shaped roof section, each of the multiple main beams extends with an inward downward slope, descending from the radially outer side to the radially inner side. Therefore, the bending stress and deflection occurring in the main beams can be effectively resisted by the tensile force of the inner circular arc beam through the braces.

[0009] This invention 2 The feature configuration is, A roof structure comprising an annular fan-shaped roof section configured in an annular fan shape in plan view, and a support section that supports the annular fan-shaped roof section, The annular fan-shaped roof section has a plurality of main beams arranged in parallel in the circumferential direction of the annular fan, extending in the radial direction of the annular fan with a predetermined roof slope, The support portion is configured to cantilever support the multiple main beams of the annular fan-shaped roof portion on the radially outer side of the annular fan shape. The annular fan-shaped roof section comprises an inner arc beam that extends in a substantially arc shape along the radial inner edge of the annular fan and to which the inner ends of each of the plurality of main beams are connected, and braces that are installed between adjacent members of the plurality of main beams. The key feature is that the structural wall, positioned below the annular fan-shaped roof section and extending radially in the annular fan shape, serves as the support section.

[0010] In this configuration, in the annular fan-shaped roof section, multiple main beams are arranged in a circumferential direction, and these multiple main beams are cantilevered on the radially outward side by the support structure. This makes the lower space on the radially inner side of the annular fan-shaped roof section feel more open and free from the presence of the support structure. Furthermore, in the annular fan-shaped roof section described above, each of the multiple main beams is cantilevered along the radial direction by a support section, extending from the outside inward with a predetermined roof slope, and the inner arc beam and brace are provided. This allows the bending stress and deflection occurring in the main beams to be effectively resisted by the axial force of the inner arc beam through the brace. Accordingly, the present invention provides a roof structure comprising an annular fan-shaped roof section configured in a plan view and a support section that supports the annular fan-shaped roof section, in which the annular fan-shaped roof section is cantilevered only on the radially outer side of the annular fan, thereby providing a sense of openness in the lower space on the radially inner side of the annular fan-shaped roof section, while rationally suppressing bending stress and deflection at the tip of the annular fan-shaped roof section. Furthermore,According to this configuration, the housing wall can effectively exhibit the rotational resistance in the radial direction by extending in the radial direction. Therefore, due to the rotational resistance of this housing wall, each of the plurality of main beams in the annular sector roof portion can be favorably cantilever-supported on the outer side in the radial direction.

Brief Description of the Drawings

[0011] [Figure 1] Plan view of the roof structure of the present embodiment [Figure 2] Cross-sectional view taken along line A-A in FIG. 1 [Figure 3] Explanatory drawing schematically showing the roof structure of Example 1 [Figure 4] Explanatory drawing schematically showing the roof structure of Comparative Example 1 [Figure 5] Explanatory drawing schematically showing the roof structure of Comparative Example 2

Modes for Carrying Out the Invention

[0012] An embodiment of the present invention will be described based on the drawings. The building 1 shown in FIGS. 1 and 2 includes a roof structure (hereinafter referred to as "the present roof structure") 50 of the present embodiment. The present roof structure 50 includes an annular sector roof portion 10 configured in an annular sector shape in plan view (see FIG. 1) and a support portion 30 that supports the annular sector roof portion 10. Note that the above-mentioned annular sector indicates the shape of a portion sandwiched between two straight lines extending in the radial direction X among regions surrounded by two concentric circles having different radii. In this building 1, an outer roof portion 60 also formed in an annular sector shape in plan view is provided outside the annular sector roof portion 10 (the upper side in FIG. 1, the left side in FIG. 2). And a roof finishing material (not shown) is laid on the upper surfaces of the annular sector roof portion 10 and the outer roof portion 60.

[0013] The annular fan-shaped roof section 10 has multiple main beams 12 that extend along the radial direction X of the annular fan with a predetermined roof slope, arranged in parallel in the circumferential direction Y of the annular fan. The support section 30 is configured with support columns 31 that cantilever-support the multiple main beams 12 of the annular fan-shaped roof section 10 on the outside of the radial direction X (upper side in Figure 1, left side in Figure 2). Furthermore, the roof slope of the annular fan-shaped roof section 10, or in other words, the slope of the main beam 12, is an inward downward slope that descends along the radial direction X from the outside (upper side of Figure 1, left side of Figure 2, side of the support section 30) to the inside (lower side of Figure 1, right side of Figure 2, opposite side of the support section 30). As described above, multiple main beams 12 are arranged in parallel in the circumferential direction Y, and these multiple main beams 12 are cantilevered by support parts 30 on the outside in the radial direction X. Therefore, the inside of the lower space 3 (see Figure 2) of the annular fan-shaped roof section 10 in the radial direction X is free from support parts 30, resulting in a sense of openness. Outer walls 5 are provided around the perimeter of the lower space 3 as appropriate.

[0014] The annular fan-shaped roof section 10 is provided with an inner arc beam 14, a middle arc beam 15, and an outer arc beam 16 that extend in a roughly arc shape along the circumferential direction Y and connect a plurality of main beams 12. The inner arc beam 14 extends in a roughly arc shape in plan view along the inner edge of the annular fan-shaped roof section 10 in the radial direction X, and is configured to connect the inner ends of each of the multiple main beams 12. The central arc beam 15 extends in a roughly arc shape in plan view along the intermediate part of the annular fan-shaped roof section 10 in the radial direction X, and is configured to connect the intermediate parts of each of the multiple main beams 12. The outer arc beam 16 extends in a substantially arc shape in plan view along the outer edge of the annular fan-shaped roof section 10 in the radial direction X, and is configured to connect the respective outer ends of the multiple main beams 12.

[0015] In the annular fan-shaped roof section 10, a first brace 21 and a second brace 22 are provided as braces 20, which are installed between adjacent main beams 12. Specifically, the first braces 21 are installed on the diagonal of the frame plane surrounded by a pair of adjacent main beams 12, an inner arc beam 14, and a middle arc beam 15. The pair of first braces 21, adjacent to each other with the main beams 12 in the circumferential direction Y, are arranged to form a V-shape or an inverted V-shape in plan view. On the other hand, the second braces 22 are installed on the diagonal of the frame plane surrounded by a pair of adjacent main beams 12, a middle arc beam 15, and an outer arc beam 16. The pair of second braces 22, adjacent to each other with the main beams 12 in the circumferential direction Y, are arranged to form a V-shape or an inverted V-shape in plan view. Furthermore, the first brace 21 and the second brace 22, which are adjacent to each other with the central arc beam 15 in the radial direction X, are arranged to form a V-shape or an inverted V-shape in a plan view.

[0016] As described above, in this roof structure 50, in the annular fan-shaped roof section 10, each of the multiple main beams 12 is cantilevered along the radial direction X by the support section 30, extending from the outside to the inside with a predetermined roof slope, and the aforementioned arc beams 14, 15, 16 and braces 20 are provided. Therefore, the bending stress and deflection occurring in the main beams 12 can be effectively resisted by the axial force of the arc beams 14, 15, 16 through the braces 20. Below, in order to explain the details of these effects, we will describe Example 1 (Figure 3), which is a schematic representation of this roof structure 50, and Comparative Examples 1 (Figure 4) and 2 (Figure 5), which are schematic representations of conventional roof structures 150 and 250. In Figures 3-5, (a) is a front view of a schematic model of each roof structure 50, 150, and 250, and (b) is a plan view of the same model. The dashed lines in Figures 3-5 indicate the state in which the main beams 12, 112, and 212 and braces 20, 120, and 220 of each roof structure 50, 150, and 250 are displaced downward due to bending stress and deflection caused by vertical loads.

[0017] [Example 1] The main roof structure 50 of Embodiment 1 shown in Figure 3 comprises an annular fan-shaped roof section 10 and support section 30, which are annular fan-shaped in plan view, as described in the above embodiment. Specifically, each of the multiple main beams 12 is arranged in the circumferential direction Y of the annular fan, and each of these main beams 12 is cantilevered by the support section 30 on the outside of the radial direction X of the annular fan (left side in Figure 3) and is provided in a state where it cantilevers downward toward the inside of the radial direction X (right side in Figure 3). The cantilevered ends (right end in Figure 3), which are the inner ends of each of the multiple main beams 12 in the radial direction X, are connected by an inner arc beam 14 that extends in a substantially arc shape in plan view along the inner edge of the annular fan-shaped roof section 10 in the radial direction X, and braces 20 are installed between each adjacent of the multiple main beams 12.

[0018] In the main roof structure 50 of Embodiment 1 configured in this way, as shown by the dashed line, when the cantilevered end (connection end to the inner arc beam 14) of the main beam 12 connected to the inner arc beam 14 deflects vertically due to a vertical load, the distance between the cantilevered ends of two adjacent main beams 12 expands from L14 to L14a. Then, tensile forces are generated in the inner arc beam 14 and the brace 20 in a manner that resists the expansion of the distance between the cantilevered ends. Therefore, the deflection of the cantilevered end of each main beam 12 is suitably resisted and rationally suppressed by the tensile forces of the inner arc beam 14 and the brace 20.

[0019] [Comparative Example 1] The roof structure 150 of Comparative Example 1 shown in Figure 4 differs from Embodiment 1 in that it has a rectangular strip-shaped roof section 110 that extends in a straight first horizontal direction Y' in a plan view. Specifically, each of the multiple main beams 112 is arranged in parallel in the first horizontal direction Y', and each of these main beams 112 is cantilevered by a support section 130 on one side (left side in Figure 4) of the second horizontal direction X' which is perpendicular to the first horizontal direction Y' in a plan view, and is provided in a state where it cantilevers downward toward the other side (right side in Figure 4) of the second horizontal direction X'. The cantilevered ends (right end in Figure 4), which are the inner ends of each of the multiple main beams 112 in the second horizontal direction X', are connected by an inner beam 114 that extends in the first horizontal direction Y' along the other side edge of the roof section 110 in the second horizontal direction X', and braces 120 are installed between each adjacent of the multiple main beams 12.

[0020] In the main roof structure 150 of Comparative Example 1, as shown by the dashed line, even if the cantilevered end (connection end to the inner beam 114) of the main beam 112 connected to the inner beam 114 deflects vertically due to a vertical load, the distance between the cantilevered ends of two adjacent main beams 112 remains unchanged at L114. Therefore, unlike in Example 1, no tensile force is generated in the inner beam 114 or the brace 120, and this tensile force cannot suppress the deflection of the cantilevered ends of each main beam 12.

[0021] [Comparative Example 2] The roof structure 250 of Comparative Example 1 shown in Figure 5 differs from the above-described embodiment 1 in that each of the multiple main beams 212 is provided in a state where it cantilevers horizontally. Specifically, each of the multiple main beams 212 is arranged in parallel in the circumferential direction Y of the annular fan shape, and each of these main beams 212 is cantilevered by a support part 30 on the outside of the radial direction X of the annular fan shape (left side in Figure 5) and is provided in a state where it cantilevers horizontally toward the inside of the radial direction X (right side in Figure 5). The cantilevered ends (right end in Figure 5), which are the inner ends of each of the multiple main beams 12 in the radial direction X, are connected by an inner arc beam 214 that extends in a substantially arc shape in plan view along the inner edge of the annular fan-shaped roof section 10 in the radial direction X, and braces 220 are installed between each adjacent of the multiple main beams 212.

[0022] In the main roof structure 250 of Comparative Example 1, as shown by the dashed line, when the cantilevered end (connection end to the inner arc beam 214) of the main beam 212 connected to the inner arc beam 214 deflects vertically due to a vertical load, the distance between the cantilevered ends of two adjacent main beams 212 expands from L214 to L214a, but the extent of this expansion is almost zero. Therefore, unlike in Example 1, the tensile force generated in the inner arc beam 14 and the brace 20 is small, and this tensile force is hardly able to suppress the deflection of the cantilevered ends of each main beam 12.

[0023] Next, with reference to Figures 1 and 2, we will explain further features of the roof structure 50. As the support section 30, a support column 31 is provided for each of the multiple main beams 12, with the outer end of the main beam 12 fixed to it and extending downward. The lower ends of each of the multiple support columns 31 are connected by a support beam 35 that extends in an arc shape in a plan view. Below every other main beam 12, a reinforced concrete structural wall 32 extending in the radial direction X of an annular fan shape is provided, and the support beam 35 is fixed to the structural wall 32 in such a way that its lower portion is embedded in the upper end portion of the structural wall 32. In other words, a structural wall 32 positioned below the annular fan-shaped roof section 10 and extending in the radial direction X of an annular fan shape is provided as the support section 30. With this configuration, the structural wall 32 extends in the radial direction X, thereby effectively exerting rotational resistance in that radial direction X. As a result, the rotational resistance of this structural wall 32 allows each of the multiple main beams 12 in the annular fan-shaped roof section 10 to be cantilevered outward in the radial direction X.

[0024] On the other hand, in building 1, the outer roof section 60, which is provided on the outside of the annular fan-shaped roof section 10, has multiple main beams 62 arranged in parallel in the circumferential direction Y, extending along the radial direction X with a predetermined roof slope. In plan view, each of the multiple main beams 62 of this outer roof section 60 and each of the multiple main beams 12 of the annular fan-shaped roof section 10 are arranged in a straight line along the radial direction X. Furthermore, each of the multiple main beams 62 of the outer roof section 60 is supported in a manner that it is installed between the upper end of the support column 31 and the outer upper edge of the structural wall 32. The roof slope of the outer roof section 60, or in other words, the slope of the main beam 62, is an outward downward slope that descends along the radial direction X from the inside (lower side in Figure 1, right side in Figure 2, support section 30 side) to the outside (upper side in Figure 1, left side in Figure 2, opposite side of support section 30).

[0025] The outer roof section 60 is provided with outer braces 23 that are installed between adjacent main beams 62. In other words, the outer braces 23 are installed on the diagonals of the frame plane surrounded by a pair of adjacent main beams 62 and an outer arc beam 16. The pair of outer braces 23, which are adjacent to each other with the main beams 62 in the circumferential direction Y, are arranged to form a V-shape or an inverted V-shape in plan view. Furthermore, the outer braces 23 and second braces 22, which are adjacent to each other with the outer arc beam 16 in the radial direction X, are arranged to form a V-shape or an inverted V-shape in a plan view.

[0026] [Another embodiment] Other embodiments of the present invention will now be described. Note that the configurations of each embodiment described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0027] (1) In the above embodiment, the roof slope of the annular fan-shaped roof section 10, that is, the slope of each main beam 12, is an inward downward slope that slopes downward from the outside to the inside, cantilevered by the support section 30 along the radial direction X. However, it may also be an inward upward slope that slopes upward from the outside to the inside, cantilevered by the support section 30 along the radial direction X. In that case, the distance between the cantilevered ends of two adjacent main beams decreases as the main beams deflect. Then, a compressive force is generated in the inner arc beams connecting the cantilevered ends of the multiple main beams and in the braces installed between each adjacent main beam, in a manner that resists the reduction in the distance between the cantilevered ends. Therefore, the deflection of the cantilevered ends of each main beam is suitably resisted and rationally suppressed by the compressive force of the inner arc beams and braces.

[0028] (2) In the above embodiment, a structural wall 32 positioned below the annular fan-shaped roof section 10 and extending in the radial direction X is provided as a support section 30 that cantilever-supports the main beam 12 of the annular fan-shaped roof section 10 on the radial direction X outside the annular fan. However, other forms of support sections 30 may be adopted, for example, by fixing a support column 31 directly to the foundation and configuring the main beam 12 to be cantilever-supported by the support column 31 alone.

[0029] (3) In the above embodiment, many main beams 12 were arranged in parallel along the radial direction X in the annular fan-shaped roof section 10, but the number of these main beams 12 can be changed as appropriate, and it is sufficient that at least two main beams are arranged in parallel. Also, in the above embodiment, no other roofs were provided at both ends of the annular fan-shaped roof section 10 in the circumferential direction Y, so that the entire roof section of the building 1 is an annular fan shape in plan view, but for example, a roof section of a different shape can be connected to at least one of the ends of the annular fan-shaped roof section 10 in the circumferential direction Y, so that the entire roof section of the building 1 is not an annular fan shape in plan view. [Explanation of symbols]

[0030] 10. Annular fan-shaped roof section 12 Main beam 14. Inner circular arc beam 20 braces 21. First Brace 22. Second Brace 30 Support part 31 Support column (support part) 32 Structure wall (support part) 35 Support beam (support part) 50 Roof structure X radial direction Y circumferential direction

Claims

1. A roof structure comprising an annular fan-shaped roof section configured in an annular fan shape in plan view, and a support section for supporting the annular fan-shaped roof section, The annular fan-shaped roof section has a plurality of main beams arranged in parallel in the circumferential direction of the annular fan, extending in the radial direction of the annular fan with a predetermined roof slope, The support portion is configured to cantilever support the multiple main beams of the annular fan-shaped roof portion on the radially outer side of the annular fan shape. The annular fan-shaped roof section comprises an inner arc beam that extends in a substantially arc shape along the radial inner edge of the annular fan and to which the inner ends of each of the plurality of main beams are connected, and braces that are installed between adjacent members of the plurality of main beams. A roof structure in which the roof slope is an inward downward slope that descends from the radially outer side of the annular fan shape toward the radially inner side of the annular fan shape.

2. A roof structure comprising an annular fan-shaped roof section configured in an annular fan shape in plan view, and a support section for supporting the annular fan-shaped roof section, The annular fan-shaped roof section has a plurality of main beams arranged in parallel in the circumferential direction of the annular fan, extending in the radial direction of the annular fan with a predetermined roof slope, The support portion is configured to cantilever support the multiple main beams of the annular fan-shaped roof portion on the radially outer side of the annular fan shape. The annular fan-shaped roof section comprises an inner arc beam that extends in a substantially arc shape along the radial inner edge of the annular fan and to which the inner ends of each of the plurality of main beams are connected, and braces that are installed between adjacent members of the plurality of main beams. A roof structure comprising a structural wall positioned below the annular fan-shaped roof section and extending radially in the annular fan shape, which serves as the support section.

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