JP7828221B2 - Folded plate roof structure - Google Patents

Description

This disclosure relates to a folded-plate roof structure. More specifically, this disclosure relates to a folded-plate roof structure that forms an arch shape.

A conventional folded-plate roof structure, for example, has multiple folded plates as vertical roofing materials. The multiple folded plates are connected in order from the eaves side to the ridge side in the direction of the roof slope. Specifically, the eave-side end of the folded plate arranged on the ridge side is overlapped from above on the ridge-side end of the folded plate arranged on the eaves side (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2014-139403

Incidentally, folded-plate roof structures with an overall arch shape have been known for some time. However, Patent Document 1 does not propose a specific method for installing multiple folded plates in an arch shape.

This disclosure has been made in light of the above reasons, and aims to provide a folded-plate roof structure that enables highly accurate construction techniques to connect multiple folded plates to create an arch shape.

A folded-plate roof structure according to one aspect of the present disclosure is a folded-plate roof structure that forms an arch shape. The folded-plate roof structure comprises a plurality of first folded plates that are aligned from one end of the arch shape toward the apex and connected to one another, a plurality of second folded plates that are aligned from the other end of the arch shape toward the apex and connected to one another, and an apex folded plate. The apex folded plate is connected to a first end folded plate located at the end of the first folded plates closest to the apex, and a second end folded plate located at the end of the second folded plates closest to the apex.

Each of the first end folding plate, the second end folding plate, and the apex folding plate has a first connecting portion located at one end in the width direction perpendicular to the length direction along the arch shape, and a second connecting portion located at the other end in the width direction.

The first connection portion of the end first folding plate has a first notch cut out toward the apex at the portion where it is connected to the first connection portion of another first folding plate to ensure an overlapping range between the first folding plates.

The first connection portion of the end second folding plate has a second notch cut out toward the apex at the portion where it is connected to the first connection portion of another second folding plate to ensure an overlapping range between the second folding plates.

The first connection portion of the vertex folding plate has a first vertex notch cut out toward the vertex at the portion connected to the first connection portion of the first end folding plate to ensure an overlapping range with the first end folding plate, and a second vertex notch cut out toward the vertex at the portion connected to the first connection portion of the second end folding plate to ensure an overlapping range with the second end folding plate.

The first notch at the apex is longer in the longitudinal direction than the first notch.

The apex second notch is longer in the longitudinal direction than the second notch.

The folded-plate roof structure according to one aspect of the present disclosure enables highly accurate construction using construction techniques that connect multiple folded plates to create an arch shape.

FIG. 1 is a schematic perspective view showing one embodiment of a double folded-plate roof structure in which a folded-plate roof structure according to the present disclosure is adopted. 2A and 2B are perspective views of a folded-plate roof structure constituting a lower roof of the double folded-plate roof structure of the same. FIG. 3 is a cross-sectional view of a main part of the double folded-plate roof structure. 4A is a front view of a folded plate provided in the folded plate roof structure of the same. FIG. 4B is a front view showing one state of the horizontal joint operation of the same folded plates. FIG. 4C is a front view showing one state of the horizontal joint operation of the same folded plates. FIG. 5 is a perspective view showing one state of the longitudinal joining operation of the folded plates. FIG. 6 is a perspective view showing one state of the longitudinal joining operation of the folded plates. FIG. 7 is a cross-sectional view of a connection portion between the longitudinally joined folded plates. 8A and 8B are schematic plan views showing one state of the longitudinal joining operation of the folded plates of the same. 9A and 9B are schematic plan views showing one state of the horizontal joining operation of the above folding plates, respectively. FIG. 10 is a schematic plan view showing one state of the vertical joint operation between the vertex folded plate provided in the folded plate roof structure and two adjacent folded plates of the same. FIG. 11 is a schematic plan view showing one state of the longitudinal joint operation between the vertex folded plate and two adjacent folded plates. FIG. 12 is a perspective view showing one state of the longitudinal joint operation between the vertex folded plate and two adjacent folded plates. FIG. 13 is a perspective view showing one state of the longitudinal joint operation between the vertex folded plate and two adjacent folded plates.

1. Embodiment (1) Overall Configuration of Double Folded Plate Roof Structure Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings.

As shown in Figure 1, the double folded plate roof structure 1 is a structure that forms an arch shape as the roof of a building 100. Here, the "arch shape" refers to a bow shape, a shape consisting of two curves extending from both ends to the apex. Note that the "arch shape" means a general arch shape, and may include some linear shapes. Specifically, the radius of curvature of the arch shape is preferably in the range of 250 to 400 m.

Note that Figure 1 is a schematic diagram intended to show that the double folded-plate roof structure 1 has an arch shape as a whole, and details are omitted.

As shown in Figures 2A and 2B, the double folded-plate roof structure 1 has a lower roof 2 and an upper roof 3. Both the lower roof 2 and the upper roof 3 are constructed of folded-plate roofs. The distance between the lower roof 2 and the upper roof 3 is approximately constant across the entire roof surface. In the following, the roof slope direction is defined as the eaves-ridge direction, and the direction perpendicular to the eaves-ridge direction and along the horizontal plane is defined as the lateral direction. In this embodiment, since the double folded-plate roof structure 1 has an arch shape as a whole as described above, the roof slopes of the lower roof 2 and the upper roof 3 are also arch-shaped.

In this embodiment, the folded-plate roof structure 30 that constitutes the lower roof 2 will be described in detail. Therefore, the description of the upper roof 3 will be simplified.

(2) Lower Roof (2-1) Structure of Lower Roof As shown in Fig. 2A, the lower roof 2 is laid on top of a roof underlayment 5. The roof underlayment 5 includes, for example, a purlin 51 and a tight frame 52.

The lower roof 2 is attached to the tight frame 52. The tight frame 52 extends horizontally and has a width in the eaves-ridge direction, which is perpendicular to its longitudinal direction. The tight frame 52 is fixed onto the main building 51. The length of the tight frame 52 is approximately parallel to the longitudinal direction of the main building 51. The tight frame 52 is formed, for example, by bending a strip of metal sheet.

The tight frame 52 has multiple mountain-shaped protrusions 53. The multiple protrusions 53 are arranged in parallel at a constant pitch along the length of the tight frame 52. A retaining clip 54 is fixed to the top of each protrusion 53. The retaining clip 54 secures the lower roof 2 to the tight frame 52. The retaining clip 54 is fixed to the tight frame 52 via fasteners such as bolts and nuts.

The roof underlayment 5 comprises multiple purlins 51. The longitudinal direction of each purlin 51 is approximately parallel to the horizontal direction. The multiple purlins 51 are arranged side by side at intervals in the eaves-ridge direction. The multiple purlins 51 arranged side by side in the eaves-ridge direction are arranged so that the purlins 51 closer to the ridge are positioned higher. Each purlin 51 is made of, for example, H-shaped steel, C-shaped steel, or lipped channel steel.

As shown in Figure 2A, the lower roof 2 has multiple peaks 11 and multiple valleys 12. The peaks 11 and valleys 12 are arranged side by side, alternating horizontally, on the lower roof 2. The peaks 11 and valleys 12 each have a length in the eaves-ridge direction.

The lower roof 2 is composed of multiple folded plates 13. The folded plates 13 are vertically-roofed metal roofing materials with a roughly U-shaped cross section. The multiple folded plates 13 are connected in multiple directions in the eaves-ridge direction and also in multiple directions to form the lower roof 2. In other words, the multiple peaks 11 and multiple valleys 12 mentioned above are made up of multiple folded plates 13. More specifically, when focusing on the eaves-ridge direction, an arch shape is formed by the connection of the multiple folded plates 13.

The folded plate 13 is formed by bending a single metal plate, for example, by roll forming. Metal plates that make up the folded plate 13 include, for example, painted steel plates, galvanized steel plates, stainless steel plates, Galvalume steel plates (registered trademark), and SGL (registered trademark). Each of the multiple folded plates 13 has the same size, basic shape, etc.

As shown in Figures 2A and 5, the folded plate 13 extends elongatedly in the eaves-ridge direction and has a width in the horizontal direction. Hereinafter, the longitudinal direction of the folded plate 13 will be referred to as the length direction, and the transverse direction will be referred to as the width direction.

The folded plate 13 has a flat portion 14, a pair of upright portions 15, and a pair of connecting portions 16. The flat portion 14 forms the bottom surface of the valley portion 12 of the lower roof 2. The flat portion 14 extends long in the eaves-ridge direction and has a width in the horizontal direction. The pair of upright portions 15 extend diagonally upward from both ends of the flat portion 14 in the width direction. The pair of upright portions 15 are inclined so that the distance between them increases as they extend upward. The pair of connecting portions 16 extend approximately horizontally from the upper ends of the pair of upright portions 15 toward the side opposite the side where the flat portion 14 is provided.

As shown in Figure 3, each connection 16 is fastened to the connection 16 of another laterally adjacent folded plate 13 with a retaining clip 54 interposed between them to form a fastening portion 21, which is then fixed to the tight frame 52 to form a peak.

The pair of connecting portions 16 will be described in detail using Figures 4A to 4C. The pair of connecting portions 16 includes a first connecting portion 17 provided at one end of the folded plate 13 in the width direction, i.e., the upper end of one of the standing portions 15, and a second connecting portion 18 provided at the other end of the folded plate 13 in the width direction, i.e., the upper end of the other standing portion 15.

The first connecting portion 17 has a flat portion 81 extending laterally outward from the upper end of one of the standing portions 15, an outer plate portion 82 rising from the laterally outer end of the flat portion 81, a top plate portion 83 extending laterally inward from the upper end of the outer plate portion 82, and a diagonally bent portion 84 bent laterally outward and diagonally downward from the laterally inner tip of the top plate portion 83.

The second connecting portion 18 has a flat portion 91 extending laterally outward from the upper end of the other standing portion 15, an inner plate portion 92 rising from the laterally outer end of the flat portion 91, a top plate portion 93 extending laterally outward from the upper end of the inner plate portion 92, an outer plate portion 94 extending downward from the laterally outer tip of the top plate portion 93, and a flat portion 95 extending laterally outward from the lower end of the outer plate portion 94. Due to this configuration, the cross-sectional shape of the second connecting portion 18 is convex upward.

As shown in Figure 5, the eaves-side end of the first connection portion 17 has a notch 101 cut out toward the ridge side (the apex side of the arch shape). The notch 101 is a portion of the first connection portion 17 that is formed in the top plate portion 83 and the diagonally bent portion 84, and is missing a length L1 in the longitudinal direction. As a result, an insertion portion 102 consisting only of the flat portion 81 and outer plate portion 82 is formed in the first connection portion 17 and has a length L1. Note that length L1 is, for example, 200 mm, and is preferably in the range of 150 to 250 mm.

(2-2) Installation of the Lower Roof The lower roof 2 is installed as follows. First, the builder installs the tight frames 52 along the longitudinal direction of the purlin 51. The builder installs the tight frames 52 on each purlin 51. At this time, the builder positions each tight frame 52 so that the downwardly concave portions between adjacent protrusions 53 of the tight frames 52 installed on each purlin 51 are aligned in a straight line in the eaves-ridge direction.

The contractor then installs the folded plate 13 on the tight frame 52. The contractor installs the folded plate 13 on multiple tight frames 52 lined up in the eaves-ridge direction, and fits it into the recessed portion below between the protruding portions 53 of each tight frame 52.

Next, the contractor vertically splices a new ridge-side folded plate 13 onto the existing ridge-side folded plate 13, as shown in Figures 5, 6, 8A, and 8B. During the vertical splicing process, the eave-side end of the new ridge-side folded plate 13 is placed over the ridge-side end of the existing ridge-side folded plate 13. At this time, the second connection portion 18 of the ridge-side folded plate 13 fits over and covers the second connection portion 18 of the eaves-side folded plate 13 from above. Furthermore, as shown in Figure 7, the insertion portion 102 (flat portion 81 and outer plate portion 82) of the ridge-side folded plate 13 is inserted into the first connection portion 17 of the eaves-side folded plate 13 from below. This creates an overlapping portion 23, where the eave-side end of the ridge-side folded plate 13 rests on and overlaps the ridge-side end of the existing eaves-side folded plate 13, as shown in Figures 6, 8A, and 8B. At this time, the length L1 of the notch 101 is the length of the overlapping portion 23. In this way, the folded plate 13 of this embodiment has a notch 101, which ensures a sufficient overlap when multiple folded plates 13 are joined vertically in the eaves-ridge direction, thereby improving overlapping and waterproofing.

As described above, multiple folded plates 13 are installed from one end of the arch shape toward the apex, and multiple folded plates 13 are installed from the other end of the arch shape toward the apex.

Next, as shown in Figures 9A and 9B, the installer places a new folding plate 13 horizontally of the folding plate 13 for which the longitudinal splice has been completed. In the horizontal splice, the installer stacks the adjacent connection portions 16 of two horizontally adjacent folding plates 13 one above the other, and secures them to the tight frame 52 with a retaining clip 54 sandwiched between the connection portions 16. Specifically, as shown in Figures 3, 4A, 4B, and 4C, in the horizontal splice, the second connection portion 18 of the new folding plate 13 fits over and covers the first connection portion 17 of the existing folding plate 13, and the retaining clip 54 of the tight frame 52 is sandwiched between this second connection portion 18 and the first connection portion 17.

Finally, the installer wraps the retaining clip 54 around the connection portions 17, 18 of two laterally adjacent folded plates 13, and then bends the connection portions 17, 18 to form the seam fixing portion 21 (i.e., seam fixing) as shown in Figure 3.

As shown in Figure 9, new folded plates 13 are joined horizontally to each of the existing multiple folded plates 13 lined up in a row using the method described above. The multiple new folded plates 13 that are joined horizontally are then joined vertically using the method described above. This connects the multiple folded plates 13 horizontally and in the eaves-ridge direction, forming a portion of the lower roof 2 that extends from one end of the arch shape toward the apex, and a portion that extends from the other end of the arch shape toward the apex.

The multiple folding plates 13 include multiple first folding plates 13 that are lined up and connected to each other from one end of the arch shape toward the apex, and multiple second folding plates 13 that are lined up and connected to each other from the other end of the arch shape toward the apex. Of the multiple first folding plates 13, those located at the end closest to the apex are called end first folding plates 13B, and of the multiple second folding plates 13, those located at the end closest to the apex are called end second folding plates 13C.

The first end folding plate 13B has the same structure as the folding plate 13 described above. Below, the names and symbols of the components of the first end folding plate 13B will be described corresponding to the folding plate 13. The first end folding plate 13B has a first connection portion 17B located at one end in the width direction and a second connection portion 18B located at the other end in the width direction. The first connection portion 17B has a first notch 101B cut out toward the apex at the portion (eaves-side end) where it connects to the first connection portion 17B of another adjacent first folding plate 13 at one end of the arch shape to ensure an overlapping range between the first folding plates 13. The length of the first notch 101B is L1a.

The second end folding plate 13C has the same structure as the folding plate 13 described above. The following description corresponds to the folding plate 13, with the names and symbols of the components of the first end folding plate 13B. The second end folding plate 13C has a first connection portion 17C located at one end in the width direction and a second connection portion 18C located at the other end in the width direction. The first connection portion 17C has a second notch 101C cut out toward the apex at the portion (eaves-side end) where it connects to the first connection portion 17C of the adjacent first folding plate 13 at the other end of the arch shape to ensure an overlapping range between the second folding plates 13. The second notch 101C has a length L1b. In this embodiment, the length L1a of the first notch 101B and the length L1b of the second notch 101C are the same, but they may be different.

(3) Apex Folded Plate The structure and attachment method of the apex folded plate 13A will be described below with reference to Figures 10 to 12. The first end folded plate 13B and the second end folded plate 13C are connected to each other by the apex folded plate 13A.

Note that in Figures 10 to 12, the first folding plates 13 other than the end first folding plates 13B and the second folding plates 13 other than the end second folding plates 13C are omitted.

The vertex folding plate 13A is similar in structure to the folding plate 13 described above. Below, the names and symbols of the components of the vertex folding plate 13A will be explained in accordance with the folding plate 13. The vertex folding plate 13A has a first connection portion 17A located at one end in the width direction and a second connection portion 18A located at the other end in the width direction.

Unlike the other folding plates 13, the vertex folding plate 13A has notches at both longitudinal ends of the first connecting portion 17A. Specifically, the first connecting portion 17A has an vertex first notch 101A1 cut out toward the vertex at the portion (one end) connected to the first connecting portion 17B of the end first folding plate 13B to ensure an overlapping area with the end first folding plate 13B. The length of the vertex first notch 101A1 is L2a, which is longer than the length L1a of the first notch 101B. As a result, an insertion portion 102A1 consisting only of the flat portion 81 and outer plate portion 82 is formed at one end of the first connecting portion 17A, with a length of L2a.

Furthermore, the first connection portion 17A has a second apex notch 101A2 cut out toward the apex at the portion (other end) connected to the first connection portion 17C of the second end fold plate 13C to ensure an overlapping area with the second end fold plate 13C. The second apex notch 101A2 has a length L2b, which is longer than the length L1 of the second notch 101C. As a result, an insertion portion 102A2 consisting only of the flat portion 81 and the outer plate portion 82 is formed at the other end of the first connection portion 17A by a predetermined length L2b. In this embodiment, the length L2a of the first apex notch 101A1 and the length L2b of the second apex notch 101A2 are the same, but they may also be different.

The apex folding plate 13A is first connected to the first end folding plate 13B, and then to the second end folding plate 13C.

When connected to the first end folding plate 13B, the eave side end of the second connection portion 18A of the vertex folding plate 13A fits over and covers the ridge side end of the second connection portion 18B of the first end folding plate 13B. Furthermore, the insertion portion 102A1 of the vertex folding plate 13A fits into the first connection portion 17B of the first end folding plate 13B, allowing one eave side end of the vertex folding plate 13A to rest on and overlap the ridge side end of the first end folding plate 13B. At this time, the insertion portion 102A2 of the vertex folding plate 13A rests on the first connection portion 17C of the second end folding plate 13C.

Next, when it is connected to the second end folding plate 13C, the eave-side end of the second connection portion 18A of the vertex folding plate 13A fits over and covers the ridge-side end of the second connection portion 18B of the second end folding plate 13C. Furthermore, the insertion portion 102A2 of the vertex folding plate 13A fits into the first connection portion 17B of the second end folding plate 13C, allowing the eave-side end of the vertex folding plate 13A to rest on and overlap the ridge-side end of the second end folding plate 13C. Note that this operation is performed with the insertion portion 102A2 of the vertex folding plate 13A resting on the first connection portion 17C of the second end folding plate 13C, so the insertion portion 102A2 of the vertex folding plate 13A must be twisted significantly to fit into the first connection portion 17C of the second end folding plate 13C.

As mentioned above, the length L2a of the apex first notch 101A1 is longer than the length L1a of the first notch 101B. Furthermore, the length L2b of the apex second notch 101A2 is longer than the length L1b of the second notch 101C. Specifically, when lengths L1a and L1b are 200 mm, lengths L2a and L2b are 250 mm or greater. It is preferable that lengths L2a and L2b be in the range of 250 to 400 mm. In other words, it is preferable that the length L2a of the apex first notch 101A1 be 50 to 200 mm longer than the length L1a of the first notch 101B. It is preferable that the length L2b of the apex second notch 101A2 be 50 to 200 mm longer than L1b of the second notch 101C. It is preferable that the length L2a of the apex first notch 101A1 be in the range of 250 to 400 mm in the longitudinal direction. The length L2b of the second apex notch 101A2 is preferably in the range of 250 to 400 mm in the longitudinal direction.

In FIG. 11 , the length Z1 of the overlapping portion 23 between the vertex folding plate 13A and the first end folding plate 13B is shorter than the length L2a of the first vertex notch 101A1. Furthermore, the length Z2 of the overlapping portion 23 between the vertex folding plate 13A and the second end folding plate 13C is shorter than the length L2b of the second vertex notch 101A2. In other words, in this embodiment, the length of the notch in the vertex folding plate 13A is set longer than the length of the overlapping portion 23 of the vertex folding plate 13A. Furthermore, the length of the overlapping portion 23 between the vertex folding plate 13A and the first end folding plate 13B or the second end folding plate 13C is set longer than the length of the overlapping portion 23 between the first folding plates 13 and the overlapping portion 23 between the second folding plates 13.

The first end folding plate 13B or the second end folding plate 13C may shift from their intended position toward the apex (to one side in the lengthwise direction) if there is an error in the longitudinal joint construction, or if the folding plate 13 is longer than designed due to factors such as the accuracy of the folding plate cutting or notch cutting. However, as mentioned above, the lengths of the first apex notch 101A1 and second apex notch 101A2 of the apex folding plate 13A are set longer than the notches 101B and 101C of the first end folding plate 13B and the second end folding plate 13C, respectively, so this shift can be absorbed and construction can be carried out without any problems.

If there is an error in the longitudinal splice construction, or if the folded plate 13 is shorter than designed due to factors such as plate cutting accuracy or notch cutting accuracy, the first end folding plate 13B or second end folding plate 13C may shift from the specified position toward the apex (one side in the longitudinal direction) or the opposite side, as opposed to the case described above. However, in this embodiment, as described above, the lengths of the apex first notch 101A1 and apex second notch 101A2 in the apex folding plate 13A are set longer than the notches 101B and 101C in the first end folding plate 13B and second end folding plate 13C, respectively. This allows the length of the overlapping portion 23 between the apex folding plate 13A and the first end folding plate 13B or second end folding plate 13C to be set longer in advance, ensuring the required length even if the overlapping portion 23 is shortened for the above reasons.

As a result of the above, high-precision construction is possible by absorbing length errors caused by connecting multiple folded plates that form the arch shape and ensuring an appropriate amount of overlap.

By constructing in this manner, the apex folded plate 13A, the first end folded plate 13B, and the second end folded plate 13C are connected to each other as shown in Figure 13, forming the apex portion of the arch-shaped lower roof 2. The apex folded plate 13A, the first end folded plate 13B, and the second end folded plate 13C are slightly curved in an arch shape. The central portion of the apex folded plate 13A in the longitudinal direction is supported by the purlin 51 and the tight frame 52.

(4) Upper Roof As shown in Figure 2B, the upper roof 3 covers the entire lower roof 2 from above. Like the lower roof 2, the upper roof 3 is also provided in an arch shape. As shown in Figures 2A and 2B, a support 7 is attached to the top of the lower roof 2, and the upper roof 3 is attached to this support 7. The support 7 is attached to the upper end of the peak portion 11 of the lower roof 2. The support 7 is attached above each tight frame 52 in the eaves-ridge direction.

The support 7 is used to install the upper roof 3 above the lower roof 2, positioning the upper roof 3 a specified distance above the lower roof 2. As shown in Figure 3, the support 7 is composed of an upper roof saddle 71 that is fixed by clamping the seam fixing portion 21 of the lower roof 2, and an upper retaining clip portion 72 that is supported by the saddle 71. The upper roof saddle 71 is made up of a pair of saddle halves 71A and 71B made of steel or the like that are joined together and connected by bolt members 73.

Each saddle half 71A, 71B has a leg 76 consisting of a bottom plate portion 74 and an upright plate portion 75. The bottom plate portion 74 is disposed on the upper surface of the flat portion 81 of one of a pair of folded plates 13 that make up one peak portion 11 and the flat portion 91 of the other folded plate 13. The upper roof saddle 71 is fixed to the lower roof 2 by tapping screws 77 driven into the sides of the legs 76. Note that bolts may be used instead of tapping screws.

As shown in Figure 2B, the upper roof 3 has multiple peaks 41 and multiple valleys 42, similar to the lower roof 2. The upper roof 3 has peaks 41 and valleys 42 arranged alternately one by one in the horizontal direction. Each peak 41 and each valley 42 extends long in the eaves-ridge direction.

The multiple peaks 41 and valleys 42 are made up of multiple folded plates 44. Each folded plate 44 is a vertically-split metal roofing material. The length of each folded plate 44 extends over substantially the entire length of the lower roof 2 in the eaves-ridge direction. Each folded plate 44 has a substantially U-shaped cross section. The multiple folded plates 44 are connected to each other in the horizontal and eaves-ridge directions. The top of the upper retaining clip portion 72 is sandwiched between the folded plates 44 and seamed. A detailed description of the connections between the multiple folded plates 44 in the horizontal and eaves-ridge directions is omitted. The folded plate 44 may have a vertically-jointed structure or may be a single piece (i.e., a structure without vertical joints).

2. Modifications The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways as long as the object of the present disclosure can be achieved.

(1) Modification of the basic configuration of the roof structure The folded-plate roof structure 30 of the present disclosure is not limited to one that constitutes the double folded-plate roof structure 1. In other words, the folded-plate roof structure 30 of the present disclosure may constitute a single-layer folded-plate roof structure consisting of only the lower roof 2 of the above embodiment.

The double folded-plate roof structure 1 disclosed herein may be a roof structure for a newly constructed building or a roof renovation structure.

(2) Modified Examples of Connection Portions of Folded Plates The shape of the connection portions 16 of the folded plates 13 and the connection structure between the connection portions 16 are not limited to the shape and connection structure shown in FIG. 3 and the like.

The shape, position, and number of the notches in the folding plates 13 can be changed as appropriate, provided that it allows or facilitates the overlapping of two folding plates 13 at the longitudinal joint.

3. Summary As described above, the folded plate roof structure (30) according to the first aspect is a folded plate roof structure (30) that forms an arch shape. The folded plate roof structure (30) includes a plurality of first folded plates (13) that are arranged from one end of the arch shape toward the apex and are connected to each other, a plurality of second folded plates (13) that are arranged from the other end of the arch shape toward the apex and are connected to each other, and an apex folded plate (13A). The apex folded plate (13A) is connected to an end first folded plate (13B) located at the end of the apex side of the plurality of first folded plates (13) and an end second folded plate (13C) located at the end of the apex side of the plurality of second folded plates (13).

Each of the first end folding plate (13B), the second end folding plate (13C), and the apex folding plate (13A) has a first connecting portion (17B, 17C, 17A) located at one end in the width direction perpendicular to the length direction along the arch shape, and a second connecting portion (18B, 18C, 18A) located at the other end in the width direction.

The first connection portion (17B) of the end first folding plate (13B) has a first notch (101B) cut out toward the apex at the portion where it connects to the first connection portion (17B) of another first folding plate (13) to ensure an overlapping range between the first folding plates (13).

The first connection portion (17C) of the end second folding plate (13C) has a second notch (101C) cut out toward the apex at the portion where it connects to the first connection portion (17C) of another second folding plate (13) to ensure an overlapping range between the second folding plates (13).

The first connection portion (17A) of the vertex folded plate (13A) has a first vertex notch (101A1) cut out toward the vertex at the portion connected to the first connection portion (17B) of the first end folded plate (13B) to ensure an overlapping range with the first end folded plate (13B), and a second vertex notch (101A2) cut out toward the vertex at the portion connected to the first connection portion (17C) of the second end folded plate (13C) to ensure an overlapping range with the second end folded plate (13C).

The first apex notch (101A1) is longer in the longitudinal direction than the first notch (101B).

The apex second notch (101A2) is longer in the longitudinal direction than the second notch (101C).

In the basic configuration of this embodiment, for example, if multiple first folding plates (13) are shorter than designed, the end first folding plate (13A) may be shifted from its predetermined position toward the opposite side from the apex by the total amount of the shortfall, thereby shortening the length of the overlapping portion (23) between the apex folding plate (13A) and the end first folding plate (13B). Therefore, unlike this embodiment, if the length of the notch in the apex folding plate is the same as the length of the notches in the other folding plates, the overlapping portion between the apex folding plate and the end first folding plate or the end second folding plate will be insufficient. However, in this embodiment, the apex first notch (101A1) is longer in the longitudinal direction than the first notch (101B), thereby setting the overlapping portion (23) longer. Therefore, even if the first folding plates (13) are shorter than designed, the overlapping portion (23) between the apex folding plate (13A) and the first folding plate (13) can be sufficiently long. Furthermore, the apex second notch (101A2) of the apex folding plate (13A) is longer in the longitudinal direction than the second notch (101C), and therefore the length of the overlapping portion (23) is also set to be long. Therefore, even if the multiple second folding plates (13) are shorter than designed, the length of the apex folding plate (13A) and the overlapping portion (23) of the second folding plates (13) can be ensured to be sufficient.

In the basic configuration of this embodiment, for example, if multiple first folding plates (13) are longer than designed, the end first folding plate (13B) may shift toward the apex from its designated position by the sum of their excess lengths. However, as described above, the apex first notch (101A1) is longer in the longitudinal direction than the first notch (101B), thereby ensuring an excess length in the apex first notch (101A1). Therefore, even if the first folding plate (13) is longer than designed, the shift can be absorbed and construction can be carried out without problems. Furthermore, the apex second notch (101A2) of the apex folding plate (13A) is set longer in the longitudinal direction than the second notch (101C). Therefore, even if the second folding plate (13) is longer than designed, the shift can be absorbed and construction can be carried out without problems.

As a result of the above, high-precision construction is possible by absorbing length errors caused by connecting multiple folded plates that form the arch shape and ensuring an appropriate amount of overlap.

In the folded-plate roof structure (30) according to the second aspect, in the first aspect, the first apex notch (101A1) is at least 50 mm longer in the longitudinal direction than the first notch (101B). The second apex notch (101A2) is at least 50 mm longer in the longitudinal direction than the second notch (101C).

In this embodiment, it is easy to ensure a sufficient length for the overlapping portion (23) between the vertex folded plate (13A) and the first end folded plate (13B), and for the overlapping portion (23) between the vertex folded plate (13A) and the second end folded plate (13C).

In the folded-plate roof structure (30) according to the third aspect, in the first or second aspect, the first apex notch (101A1) is 250 mm or more in the longitudinal direction. The second apex notch (101A2) is 250 mm or more in the longitudinal direction.

In this embodiment, it is easy to ensure a sufficient length for the overlapping portion (23) between the vertex folded plate (13A) and the first end folded plate (13B), and for the overlapping portion (23) between the vertex folded plate (13A) and the second end folded plate (13C).

30: Folded plate roof structure 13: Folded plate 13A: Apex folded plate 13B: First end folded plate 13C: Second end folded plate 17A, 17B, 17C: First connecting portion 18A, 18B, 18C: Second connecting portion 101A1: Apex first notch 101A2: Apex second notch 101B: First notch 101C: Second notch

Claims (3)

A folded plate roof structure that forms an arch shape,
A plurality of first folding plates arranged from one end of the arch shape toward an apex and connected to each other;
A plurality of second folded plates arranged from the other end of the arch shape toward the apex and connected to each other;
An end first folded plate located at an end on the apex side of the plurality of first folded plates and an end second folded plate located at an end on the apex side of the plurality of second folded plates are provided,
Each of the first end fold plate, the second end fold plate, and the vertex fold plate is
a first connection portion located at one end in a width direction perpendicular to a length direction along the arch shape, and a second connection portion located at the other end in the width direction,
The first connection portion of the end first folding plate has a first notch cut out toward the apex side in a portion connected to the first connection portion of another first folding plate adjacent to the one end side to ensure an overlapping range between the first folding plates,
The first connection portion of the end second fold plate has a second notch cut out toward the apex side in a portion connected to the first connection portion of another second fold plate adjacent to the other end side to ensure an overlapping range between the second fold plates,
The first connection portion of the vertex folded plate has a vertex first notch cut out toward the vertex side at a portion connected to the first connection portion of the end first folded plate to ensure an overlapping range with the end first folded plate, and a vertex second notch cut out toward the vertex side at a portion connected to the first connection portion of the end second folded plate to ensure an overlapping range with the end second folded plate,
the first notch at the apex is longer in the length direction than the first notch,
The apex second notch is longer than the second notch in the length direction.
Folded plate roof structure. The first notch at the apex is 50 mm or more longer than the first notch in the length direction,
The folded plate roof structure according to claim 1, wherein the apex second notch is 50 mm or more longer than the second notch in the length direction. The first notch at the apex is 250 mm or more in the length direction,
The folded plate roof structure according to claim 1 or 2, wherein the apex second notch is 250 mm or more in the length direction.