JP2022131902A - Roof material - Google Patents

Abstract

To provide a roof material which can be easily molded while improving strength of the roof material.SOLUTION: A roof material (2) comprises a pair of seam fastening parts (24), a bottom part (22), a pair of inclination parts (23) and a pair of bottom corner parts (26) and both of a first connection part (Y) of the bottom corner part and the bottom part and a second connection part (X) of the bottom corner part and the inclination part are ridge-folded viewed from above.SELECTED DRAWING: Figure 2

Description

The present invention relates to roofing materials.

BACKGROUND ART A roof structure constructed by connecting a plurality of folded plates formed by bending one steel plate is known as a conventional technique. The roof structure is installed on beams via a tight frame that is mounted on the beams. Since such a roof structure is composed of folded plates, it has high strength, and is lighter than a tiled roof or the like, so it has high earthquake resistance performance and is easy to construct. Therefore, it is suitable for roofs of large buildings such as factories and warehouses.

For example, in Patent Document 1 below, a mountain flat portion and a valley flat portion (bottom portion) are alternately formed in a row, and a rising portion (inclined portion) is continuously formed between the mountain flat portion and the valley flat portion. A seam-to-edge sheet folded-plate roof member is disclosed.

Utility Model Registration No. 3223928

However, in the prior art as described above, the peak flat portion, the valley flat portion, and the rising portion are separated by one folded portion, and no other folded portion is formed except for the seam portion. Normally, the more bent portions, the higher the strength of the folded plate.

For example, in strong wind areas, typhoons, north winds, etc., exert a large negative pressure load on the roof material, and in order to prevent deformation and damage to the folded plate roof due to strong winds, etc., it is necessary to increase the strength of the folded plate used as the roof material. . However, forming a large number of bent portions in the folded plate causes problems such as an increase in the number of forming steps in a roll forming machine, a decrease in dimensional accuracy, and an increase in manufacturing cost.

One aspect of the present invention has been made in view of the above problems, and an object thereof is to provide a roofing material that can be easily molded while enhancing the strength of the roofing material.

In order to solve the above problems, a roofing material according to one aspect of the present disclosure includes a pair of seam portions located at both ends in the working width direction, a bottom portion located between the pair of seam portions, A pair of inclined portions extending at an angle between the pair of seam portions and the bottom portion, and a pair of bottom corner portions having one end connected to the inclined portion and the other end connected to the bottom portion Both of the first connecting portion between the bottom corner portion and the bottom portion and the second connecting portion between the bottom corner portion and the inclined portion form a valley fold when viewed from above. and a corner.

According to the above configuration, the bottom portion of the folded plate constituting the roof material is folded in two stages by the first connection portion and the second connection portion, so that the cross section is strengthened (the section modulus is increased), The strength of the folded plate can be increased. Moreover, since the first connecting portion and the second connecting portion are bent in the same direction, the folded plate can be easily formed.

The width of the bottom corner may be less than the width of the slope.

The bottom corner may slope more gently than the slope.

The bottom corner portion may not include a mountain-fold portion between the first connecting portion and the second connecting portion when viewed from above.

According to the above configuration, the bottom portion of the folded plate is folded in two in the same direction by the first connection portion and the second connection portion. Since it does not include a stepped bottom, it is possible to easily form a folded plate.

The difference between the angle between the bottom corner portion and the bottom portion of the first connecting portion and the angle between the bottom corner portion and the inclined portion of the second connecting portion is within 5°. good too.

According to the above configuration, the difference between the two angles is within 5°, which is approximately the same angle. For this reason, the force is not biased toward one side of the load, and the force is applied evenly, so that the strength can be increased.

The angle at the first connecting portion and the angle at the second connecting portion may be different from each other.

According to the above configuration, since the bottom portion of the folded plate is folded in two steps, the effect of improving the strength can be obtained, so that the folded plate can be easily formed.

The pair of seam portions are square seams, and between the pair of seam portions and the pair of inclined portions, there is provided a fitting that engages with a projecting locking portion formed on the side portion of the tight frame. A joining portion may be provided, and the joining portion may be positioned above a center in a height direction of the roof material.

According to the above configuration, the folded plate and the tight frame are fitted above the center in the height direction of the roof material. Negative pressure load can be transmitted to the tight frame itself, preventing damage to the roof material. Moreover, since it is fitted on the upper side, it is easy to visually recognize and workability can be improved.

ADVANTAGE OF THE INVENTION According to 1 aspect of this invention, the roof material which can be easily shape|molded can be provided, raising the intensity|strength of a roof material.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows an example of the external appearance of the roof structure which concerns on Embodiment 1 of this invention. It is an example of the front view of the folded plate shown in FIG. It is an example of the perspective view of the folded plate shown in FIG. It is a figure which shows the state which attached the folded plate shown in FIG. 2 to the tight frame. FIG. 2 is an enlarged view showing an example of a seam portion and a fitting portion of the roof structure shown in FIG. 1; It is a figure explaining the test method of the folded plate which concerns on Embodiment 1 of this invention, and another folded plate. It is a figure which shows the test result of the test body 1 which concerns on Embodiment 1 of this invention. FIG. 10 is a diagram showing test results of comparative body 1; FIG. 10 is a diagram showing test results of comparative body 2; FIG. 2 is a diagram showing comparative test results of Test Specimen 1, Comparative Specimen 1, and Comparative Specimen 2;

[Embodiment 1]
An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5. FIG. In this embodiment, the roof structure is fixed to the roof substrate such as the beam 4 through the tight frame 3 by connecting the folded plate 2 used as a roof material by seam and fitting it with the tight frame 3. An example of 1 will be described.

However, the present invention is not limited to this, and the folded plate roofing material that secures the folded plate to the tight frame with fastening members such as nuts and bolts, and the seam tightening method that secures the folded plate to the tight frame via a hanger. Various types of roof materials such as folded-plate roof materials and cap-fitting-type folded-plate roof materials in which connecting portions of folded plates are fixed by covering with caps can also be applied.

<Roof structure>
FIG. 1 is a perspective view showing an example of the appearance of a roof structure 1 according to Embodiment 1 of the present invention. As shown in FIG. 1 , the roof structure 1 is a metal roof structure 1 configured by connecting a plurality of folded plates 2 . The folded plate 2 formed by bending a single steel plate using a roll forming machine or the like has high bending rigidity and is stronger than a single steel plate that is used as it is. It is suitably used as a roofing material for

Further, the steel plate processed into the folded plate 2 has a thickness of about 0.6 mm to 1.0 mm, for example. As will be described later, the folded plate 2 has more bent portions by a method that can be easily formed, so it has higher wind pressure resistance and is stronger against typhoons than general folded plate materials.

The folded plates 2 are alternately and continuously provided with adjacent folded plates 2A, ridge-shaped peaks 21, and trough-shaped bottoms 22 which are connected by seaming. Between the top portion 21 and the bottom portion 22, an inclined portion 23 connecting the top portion 21 and the bottom portion 22 and extending from the top portion 21 and the bottom portion 22 is formed. Details of seam tightening of the folded plate 2 will be described later with reference to FIG. 5 .

The folded plate 2 is installed on the beam 4 via the tight frame 3 . The folded plate 2 has a fitting portion 25 that fits with a projecting locking portion 34 formed on the tight frame 3 . The folded plate 2 is firmly attached to the tight frame 3 by fitting the fitting portion 25 with the protruding locking portion 34 of the tight frame 3 . Details of the fitting between the folded plate 2 and the tight frame 3 will be described later with reference to FIG.

In addition, the folded plate 2 may be backed with a thin heat insulating sheet (not shown) on the back side (lower side) of the folded plate 2 in order to prevent dew condensation. The heat-insulating sheet has a thickness of about 4.0 mm, and may be attached to the back side of the steel plate with an adhesive or the like before the steel plate is bent and shaped. The heat insulating sheet is made of resin, for example.

The tight frame 3 is attached to the upper surface of the roof foundation such as the beams 4 by means of fastening members such as welding or bolts. The tight frame 3 includes a connecting portion 33 having a ridge portion 31 and a trough portion 32 continuously formed along the shape of the folded plate 2, and a connecting portion 33 formed of an inclined surface connecting the ridge portion 31 and the trough portion 32. ing.

As described above, the tight frame 3 is provided with the projecting locking portion 34 for fitting the folded plate 2 to the fitting portion 25 of the folded plate 2 on the upper portion of the connecting portion 33 . Details of the fitting between the folded plate 2 and the tight frame 3 will be described later with reference to FIG.

In the first embodiment, the strip-shaped tight frame 3 in which the peak portions 31 and the valley portions 32 are continuously formed has been described. The tight frame 3 is not limited to this, and may be a tight frame that includes one mountain portion 31 and a pair of connecting portions 33 on both sides of the mountain portion 31 to form a pair of beam fixing portions. In this case, a plurality of tight frames may be installed side by side on the beam 4 .

The beam 4 is a roof foundation realized by a steel frame or the like, and a tight frame 3 is attached to the upper surface thereof by welding or bolts. A plurality of beams 4 are arranged in a direction perpendicular to the direction of the working width W (shown in FIG. 2) of the folded plate 2 (the direction toward the apex of the roof, hereinafter referred to as the "depth direction"). Thereby, it is possible to prevent the folded plate 2 from being deformed or damaged along the depth direction. The working width is the width of the portion of the folded plate 2 that can be actually used, excluding the portion overlapping the adjacent folded plate 2 . That is, the working width indicates the width per one folded plate 2 in the roof structure 1 in the direction in which the multiple folded plates 2 are combined.

<Folded plate>
FIG. 2 is an example of a front view of the folded plate 2, FIG. 3 is an example of a perspective view of the folded plate 2, and FIG. Moreover, FIG. 5 is an enlarged view showing an example of the seam tightening portion and the fitting portion of the roof structure 1. As shown in FIG. Based on FIGS. 2-5, the folded plate 2 of Embodiment 1 is demonstrated further in detail.

As shown in FIGS. 2 and 3, the folded plate 2 is formed by folding one steel plate. The folded plate 2 includes a pair of peaks 21a and 21b formed in a mountain shape at both ends in the working width direction W, and a bottom portion 22 formed in a valley shape in the substantially central portion of the folded plate 2. ing. Furthermore, the folded plate 2 has a pair of inclined portions 23 a and 23 b and a pair of bottom corner portions 26 .

Between the top portions 21a, 21b and the bottom portion 22, inclined portions 23a, 23b connecting the top portions 21a, 21b and the bottom portion 22 are formed, respectively. Moreover, the inclined portions 23a and 23b are formed so as to continue to the top portions 21a and 21b and the bottom portion 22, respectively.

An upper seam portion 24a is formed on the top portion 21a, and a lower seam portion 24b is formed on the top portion 21b.

As shown in FIG. 4, the upper seam portion 24a of the folded plate 2 is engaged with the lower seam portion 24b formed on the mutually adjacent folded plate 2A, and by seaming, the folded plate 2 is , and the adjacent folded plate 2A.

In this way, by connecting the mutually adjacent folded plates 2 and 2A by seaming, as shown in FIG. A structure 1 is constructed.

The seam portion 24 is a corner seam having a substantially rectangular cross-sectional shape. The details of the corner seam will be described later with reference to FIG.

(double fold)
With reference to FIG. 2 again, the bottom corner portion 26 formed on the bottom portion 22 of the folded plate 2 will be described. A bottom corner portion 26a is formed in the bottom portion 22 by bending in a direction close to the inclined portion 23a in the vicinity of the connecting portion with the inclined portion 23a. In other words, the bent portion Xa (second connecting portion) that divides between the bottom corner portion 26a and the inclined portion 23a, and the bent portion Ya (first connecting portion) that divides between the bottom corner portion 26a and the bottom portion 22. and are formed. That is, the bottom portion 22 is folded in two by the folded portion Xa and the folded portion Ya. The width of the bottom corner portion 26a (the length between the bent portions Xa and Ya) is shorter than the width of the inclined portion 23a (the length from the bent portion Xa to the fitting portion 25a).

Also, the bottom 22 is similarly bent in the direction of approaching the inclined portion 23b in the vicinity of the connecting portion with the inclined portion 23b to form a bottom corner portion 26b. In other words, the bent portion Xb (second connecting portion) that divides between the bottom corner portion 26b and the inclined portion 23b, and the bent portion Yb (first connecting portion) that divides between the bottom corner portion 26b and the bottom portion 22. and are formed. That is, the bottom portion 22 is folded in two by the folded portion Xb and the folded portion Yb. The width of the bottom corner portion 26b (the length between the bent portions Xb and Yb) is shorter than the width of the inclined portion 23b (the length from the bent portion Xb to the fitting portion 25b).

As a result, the bottom portion 22 is formed with the bent portions Ya and Yb in the vicinity of the connection portions with the inclined portions 23a and 23b, and is folded in two stages, so that the strength of the folded plate 2 can be increased. Details of improvement in the strength of the folded plate 2 will be described later based on the test results shown in FIGS. 6 to 10 .

Both the bent portions Xa, Xb and the bent portions Ya, Yb that define the bottom corners 26a, 26b form valley folds when viewed from above. In addition, there is no mountain fold between the bent portions Xa and Ya and between the bent portions Xb and Yb.

In other words, the bent portion Ya is bent in the same direction as the bent portion Xa, the bent portion Yb is similarly bent in the same direction as the bent portion Xb, and there are no portions that are bent in different directions.

Therefore, the forming process using a roll forming machine or the like does not become complicated as compared with the case of bending to the opposite side. Moreover, since the number of bent portions of the folded plate 2 is increased only at the two bent portions Ya and Yb, the dimensional accuracy and the manufacturing cost are hardly affected. In addition, since the shape of the bent portion is fine and not complicated, the folded plate 2 can be easily formed even if the heat-insulating sheet described above is adhered.

In addition, compared to the case where both ends of the bottom portion 22 are bent only once, in the case of two-step folding, the lines of the steel plate are course-cut, and the dimensions required for forming are shortened. In general, since the width dimension of commercially available steel sheets is fixed, if the necessary dimension is shortened, there is a margin in the dimension of the steel sheet in the width direction. The dimensional margin of the steel plate can be used, for example, to increase the peak height of the folded plate 2 (the length from the lower surface of the bottom portion 22 to the upper surface of the top portion 21).

In the folded plate 2, the rigidity (cross-sectional performance) is generally improved as the geometrical moment of inertia increases as the peak height increases. Therefore, by folding the bottom portion 22 in two stages, the height of the crest can be increased using the margin of the steel plate, and the strength of the folded plate 2 can be further increased.

By folding the bottom portion 22 in two stages in this way, it is possible to produce the folded plate 2 that is easy to mold, has high wind pressure resistance, and has high strength. Although the bottom corners 26a and 26b are flat here, they may include three or more stages of valley folds including the folded portions at both ends.

(same angle)
As shown in FIG. 2, the bottom corners 26a, 26b are inclined with respect to the horizontal, and the angle of inclination of the bottom corners 26a, 26b with respect to the horizontal is less than the angle of the inclinations 23a, 23b with respect to the horizontal. .

For example, the bending angle x at the bending portion Xa is 25°, the bending angle y at the bending portion Ya is 25°, and the angles x and y are the same angle or have an angle difference of 5° or less. If the angle is 25°, the total angle obtained by adding the angle x and the angle y is 50°. The bent portions Xb and Yb are also configured in the same manner.

If the difference between the angle x and the angle y is within 5°, they can be considered to be about the same angle. As a result, the load is evenly applied to the periphery of the double-folded portion, and damage is less likely to occur even when the load is applied, compared to the case where the load is unevenly applied to one of the folded portions Xa and Ya.

In addition, the angles x and y are not limited to this, and may be angles different from each other. Also, the total angle obtained by adding the angle x and the angle y may be an angle other than 50°.

(rib)
As shown in FIG. 2, the bottom portion 22 has a recess 27 formed substantially in the center thereof. The recesses 27 function as ribs and are formed to reinforce the folded plate 2 .

Further, when the length of the bottom portion 22 is extended due to heat, the bottom portion 22 bulges upward or downward by the length of the extension and is deformed. At this time, if the concave portion 27 is formed, the direction in which the bottom portion 22 expands can be directed downward, which is the same direction as the direction in which the concave portion 27 expands. Therefore, the direction of deformation of the bottom portions 22 can be controlled, and deformation of each bottom portion 22 in an arbitrary direction can be suppressed.

(upper mating)
As shown in FIGS. 2 and 4, the folded plate 2 is fitted with a projecting engagement portion 34a formed on the connecting portion 33a of the tight frame 3 between the upper seam portion 24a and the inclined portion 23a. It has a joint 25a. Also, between the lower seam portion 24b and the inclined portion 23b, there is provided a fitting portion 25b that is fitted with a projecting locking portion 34b formed on the connecting portion 33b of the tight frame 3. As shown in FIG.

The projecting locking portion 34a and the projecting locking portion 34b are configured as a pair, and similarly, the fitting portion 25a and the fitting portion 25b are configured as a pair.

The bent plate 2 is firmly attached to the tight frame 3 by fitting the pair of fitting portions 25a and 25b into the pair of projecting locking portions 34a and 33b.

The fitting portions 25a and 25b are positioned above the center of the folded plate 2 in the height direction. In addition, the projecting locking portions 34a and 33b are also positioned above the center in the height direction.

Therefore, when attaching the folded plate 2 to the tight frame 3, the fitting portions 25a and 25b and the protruding locking portions 34a and 33b are easily visible, which facilitates installation.

The positions of the fitting portions 25a and 25b are not limited to this, and may be positioned at the center of the folded plate 2 in the height direction or below the center.

(square seam)
As described above, the top portion 21a of the folded plate 2 is formed with the upper seam portion 24a, and the top portion 21b is formed with the lower seam portion 24b. The upper seam portion 24a of the folded plate 2 is engaged with the lower seam portion 24b formed on the mutually adjacent folded plate 2A, and the folded plate 2 is connected to the folded plate 2A by seaming. be. By connecting the mutually adjacent folded plates 2 in this way, as shown in FIG. 1, a roof structure in which a plurality of top portions 21 and a plurality of bottom portions 22 are alternately and continuously formed. 1 is configured.

As shown in FIG. 2, the seam portion 24 is a corner seam in which the cross-sectional shape of the upper seam portion 24a is formed in a substantially rectangular shape. A bending piece 24c that bends upward is formed at the end of the upper seam portion 24a, and a rising portion 24d that stands substantially vertically from the top portion 21b is formed in the lower seam portion 24b.

Since the square seams are generally straight lines, they can be formed with higher dimensional accuracy than round seams or the like. In addition, since less material is required, the reduced material can be used to further increase the strength of the folded plate 2, such as by increasing the height of the crest.

As shown in FIG. 5, the upper seam portion 24a is engaged with the lower seam portion 24b for seam tightening. At this time, the bent upper seam portion 24a sandwiches the upper portion of the lower seam portion 24b. As a result, the upper seam portion 24a and the lower seam portion 24b can be tightened more firmly.

Although seam by square seam has been described above, it is not limited to this, and various seams such as round seam or triangular seam may be used.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

In this example, a folded plate gutter bottom model fracture test was performed to examine the vertical buckling strength of the bottom portion 22 of the folded plate 2 . As test objects, three types of models of the bottom portion 22 of the folded plate 2 were produced, and three models were produced for each type, and the buckling strength of each model was measured. Each model has a scale of 1/2 of the actual folded plate, and each model uses the original plate of the same size with a width of 408 mm, and three types of models are produced by changing only the bending position.

Specifically, each model is installed so that the bottom part faces upward, and a test machine (Shimadzu Corporation universal testing machine: model number AG-100kNX) is used to apply a load at a test speed of 10 mm / min to each model, The maximum load until the model was displaced and the maximum point displacement when the maximum load was applied were measured.

FIG. 6 is a diagram for explaining the test method of the folded plate and other folded plates according to Embodiment 1 of the present invention, FIG. 7 is a diagram showing the test results of the test body 1 according to Embodiment 1, and FIG. FIG. 9 shows the test results of Comparative Example 2. FIG. Moreover, FIG. 10 is a diagram showing the test results of test sample 1, comparative sample 1, and comparative sample 2 in comparison.

Each graph shown in FIGS. 7 to 9 is a graph showing the relationship between the vertical load (test force) and displacement (stroke) applied to each model. Each image shown under each graph is an image showing the state of each model before and after the test. For ease of viewing, the graphs 1-2 and 1-3 are shown with their origins shifted in the X-axis direction.

As shown in FIG. 6, the specimen 1 is a model that assumes the folded plate 2 of the first embodiment. Specifically, a folded plate having a peak height of 166 mm and having a pair of bottom corners 26 was assumed.

Comparative bodies 1 and 2 are models produced for comparison with the folded plate 2 of the first embodiment. Specifically, the comparative body 1 assumed a folded plate with a peak height of 162 mm without bottom corners, and the comparative body 2 assumed a folded plate with a peak height of 172 mm without bottom corners.

That is, when comparing the heights of the peaks, the comparative body 2 is the highest at 172 mm, the comparative body 1 is the lowest at 162 mm, and the test body 1 is the height between the comparative body 1 and the comparative body 2 166 mm.

As shown in FIGS. 7 to 10, the average value of the load at the maximum point displacement of the test body 1 was 4.41 kN, the comparative body 1 was 3.86 kN, and the comparative body 2 was 4.02 kN. No. 1 had higher strength than Comparative No. 1 and Comparative No. 2.

In general, a folded plate with a higher peak height has a higher buckling strength than a folded plate with a lower peak height. However, in the specimen 1, the buckling strength was higher than that of the comparative specimen 2, although the comparative specimen 2 had a higher peak height than the specimen 1.

2 Folded plate (roofing material)
22 bottom portion 23 inclined portion 24 seam portion 25 fitting portion 26 bottom corner portion 34 projecting locking portion Xa, Ya bending portion (first connection portion)
Xb, Yb bending portion (second connecting portion)

Claims (7)

a pair of seam tightening portions located at both ends in the working width direction;
a bottom portion positioned between the pair of seam portions;
a pair of inclined portions extending at an angle between the pair of seam portions and the bottom portion;
A pair of bottom corners, one end of which is connected to the inclined portion and the other end of which is connected to the bottom, wherein the bottom corner is connected to the bottom by a first connecting portion, and the bottom corner is connected to the inclined portion. and the pair of bottom corners, both of which are valley-folded when viewed from above. 2. The roofing material of claim 1, wherein the bottom corner width is less than the slope width. 3. Roofing according to claim 1 or 2, wherein the bottom corner slopes more gently than the slope. 4. The bottom corner according to any one of claims 1 to 3, wherein the bottom corner does not include a mountain-fold portion between the first connecting portion and the second connecting portion when viewed from above. roofing material. The difference between the angle between the bottom corner and the bottom in the first connecting portion and the angle between the bottom corner and the inclined portion in the second connecting portion is within 5°. Roofing material according to any one of claims 1 to 4. The roofing material according to any one of claims 1 to 4, wherein the angle at the first connection portion and the angle at the second connection portion are different from each other. The pair of seam portions are square seams,
A fitting portion is provided between the pair of seam tightening portions and the pair of inclined portions and is fitted with a protruding locking portion formed on the side portion of the tight frame,
The roofing material according to any one of claims 1 to 6, wherein the fitting portion is positioned above the center in the height direction of the roofing material.

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