JP7503940B2 - Joint structure of folded roof panels - Google Patents

Description

The present invention relates to a joint structure for folded roof panels that can be easily installed and provides excellent waterproofing against rainwater intrusion in a fastening type folded roof.

Conventionally, many folded-plate roofs (including walls) made of metal fastened folded-plate roof panels have been constructed. The folded-plate roof panels that constitute such folded-plate roofs generally have inclined rising portions formed on both sides of the valley in the width direction, with a lower run portion formed on one side in the width direction and an upper run portion formed on the other side. Then, a plurality of such folded-plate roof panels are arranged side by side, and the lower run portions and the upper run portions of adjacent folded-plate roof panels are fastened together while overlapping each other via retaining clips, and the retaining clips are attached to the receiving metal fittings, and the metal folded-plate roof is constructed.

This type of fastened folded plate roof is often used as the roof of a large building. Therefore, the folded plate roof panels used are often long. However, there is a limit to how long the folded plate roof panels can be, and for buildings that exceed this limit, it becomes necessary to connect the folded plate roof panels together in a row in the longitudinal direction.

Moreover, in recent years, it has become common for such folded roof panels to be prefabricated in factories and then transported to the construction site for construction. As a result, the length of a folded roof panel that can be transported from the factory to the construction site is limited to about 20 meters, and typically it is often a little over 10 meters long. In such cases, the folded roof panels must be connected together in the longitudinal direction, and a joint must be constructed at this point.

JP 2013-213395 A

In this way, in the case of a fastened type of folded plate roof, it is common to connect folded plate roof panels together to construct the roof, not only in large or medium-sized buildings. Many joint structures have been developed for such longitudinal joints in folded plate roof panels. What is particularly important is waterproofing, followed by ease of construction. Furthermore, it is desirable for the joints to be inconspicuous from an external perspective.

Patent Document 1 is cited as one example of many joint structures. This patent document 1 achieves the objective of waterproofing. However, compared to normal folded roof panels, Patent Document 1 requires complex processing, and there are still many problems, such as troublesome installation. The object of the present invention is to provide a joint structure for folded roof panels that can be extremely waterproof, can be easily installed, and is less noticeable.

Therefore, the inventors have conducted intensive research to solve the above-mentioned problems, and as a result, have found the invention of claim 1 to be a joint structure on the above-water side and below-water side of a folded-plate roof panel having inclined side portions formed on both sides in the width direction of a bottom portion, top portions formed outward from the upper ends of both side portions, a lower run portion formed from the outer end of one of the top portions, and an upper run portion formed from the outer end of the other top portion, wherein a band-shaped shallow recess is provided on the above-water side in the longitudinal direction of the folded-plate roof panel located on the below-water side, which bulges downward and expands in the longitudinal direction , and the band-shaped shallow recess has a stepped bottom portion that is lower than the bottom portion and a stepped side portion that is lower than the side portions, and a first step portion is formed at the underwater end of the longitudinal direction of the band-shaped shallow recess, and along the width direction perpendicular to the longitudinal direction, from the bottom portion and the side portion toward the bottom and expanding outward, and a stepped concave surface that is flat from the lower end of the first step portion is formed, a second step portion extending upward from the above-water end of the step concave surface is formed , a roof panel support surface portion that is parallel to the bottom surface and both side surfaces is formed at the above-water end of the band-shaped shallow recess, and the lower run portion has a lower connection area portion with a cut-out portion where the upper part is cut out, and the folded plate roof panel located on the above-water side has an upper connection area portion on the below-water side in the longitudinal direction and at the ends of the bottom surface and both side surfaces, in which a folded piece that slopes downward is formed, and the lower connection area portion of the folded plate roof panel located on the below-water side and the upper connection area portion of the folded plate roof panel located on the above-water side are overlapped, a gap is provided between the first step portion of the below-water end of the band-shaped shallow recess and the folded piece, and two band-shaped seal materials are arranged between the lower connection area portion and the upper connection area portion along the width direction perpendicular to the longitudinal direction. This problem is solved by providing a joint structure for the folded plate roof panel.

The invention of claim 2 solves the above problem by configuring the roof support surface portion as a joint structure of a folded-plate roof panel that is flush with the bottom surface portion and the side surface portion in the joint structure of a folded-plate roof panel according to claim 1. The invention of claim 3 solves the above problem by configuring the roof support surface portion as a joint structure of a folded-plate roof panel that is flush with the bottom surface portion and the side surface portion in the joint structure of a folded-plate roof panel according to claim 1.

The invention of claim 4 solves the above problem by providing a joint structure for a folded plate roof panel as described in any one of claims 1, 2 or 3 , in which the first step portion and the second step portion in the lower connection area are formed on both top surface portions, and downwardly inclined folded pieces are formed at the ends of both top surface portions .

The above problem was solved by the invention of claim 5, which is a joint structure for a folded plate roof panel as described in any one of claims 1, 2, 3 or 4 , characterized in that the lower connection area portion is provided on one longitudinal side of the folded plate roof panels on both the belowwater side and the abovewater side, and the upper connection area portion is provided on the other longitudinal side.

In the invention of claim 1, the joint structure on the above-water side and below-water side of the folded-plate roof panel is extremely simple, yet has excellent performance in preventing rainwater from entering through the joint. The details are as follows: First, in the folded-plate roof panel located on the below-water side, a lower connection area is provided, and in this lower connection area, a band-shaped shallow recess with a cross-sectional flat concave shape that is concave downward is provided.

The above-water end of the band-shaped shallow recess has a roof panel support surface that is parallel to the bottom surface and both side surfaces. The upper connection area of the folded roof panel located above the water has an upper connection area with a downwardly sloping folded piece formed on the longitudinal below-water side and at the ends of the bottom surface and both side surfaces.

With this configuration, at the joints between adjacent folded roof panels on the above-water side and below-water side, a gap is formed between the band-shaped shallow recess in the lower connection area and the upper connection area. Rainwater seeping in from the joints does not experience capillary action due to the gap, and the infiltration of rainwater can be blocked within the gap.

In addition, a gap is provided between the underwater end of the band-shaped shallow recess and the folded piece of the folded roof panel located above the water, making it difficult for rainwater to seep into the gap from the outside. Even if a small amount of rainwater flows into the gap and accumulates, it is gradually discharged to the outside through the gap, preventing rainwater from accumulating in the gap more than a certain amount, thereby improving the ability to prevent rainwater from seeping inside the building.

Furthermore, in the invention of claim 1, the upper part of the lower run in the area corresponding to the step concave surface is cut away to form a cut-out portion, and when the folded-plate roof panel located above the water and the folded-plate roof panel located below the water overlap, especially in the area where the lower run overlaps, the upper part of the lower run of the folded-plate roof panel located below the water is cut away to form a cut-out portion, so that interference between the overlapping lower run parts on the below water side and the below water side can be minimized, and the joint between the lower run parts can be made in an extremely good condition. In this way, it is possible to configure a joint part of the folded-plate roof panels located above the water side and below the water side that can adequately withstand the large typhoons that have occurred particularly frequently in recent years and the accompanying heavy rains.

Furthermore, in the invention of claim 1, the band-shaped shallow recess has a stepped bottom surface portion that is lower than the bottom surface portion and a stepped side surface portion that is lower than the side surface portion, and the mechanical strength of the gap formed by the band-shaped shallow recess can be improved. Furthermore, in the invention of claim 1, the folded roof panel located on the underwater side has a band-shaped shallow recess in the lower connection area portion, in which a first step is formed at the longitudinal underwater end and along the width direction perpendicular to the longitudinal direction, and a second step is formed on the longitudinal abovewater side of the lower connection area portion and along the width direction perpendicular to the longitudinal direction, so that the cross-sectional shape of the band-shaped shallow recess along the longitudinal direction is approximately flat inverted gate (arch) shape or approximately dish shape, and the structure can be made to easily discharge rainwater that has entered the gap formed by the band-shaped shallow recess to the outside for a while.

In the first aspect of the invention, the band-shaped seal material is arranged between the lower connection area and the upper connection area along the width direction perpendicular to the longitudinal direction, so that the band-shaped seal material is in almost intimate contact with both the lower connection area and the upper connection area, and rainwater can be further prevented from entering. In the second aspect of the invention, the roof support surface is flush with the bottom surface and the side surface, so that the upper connection area of the folded roof plate located above the water is slightly higher than the bottom surface of the folded roof plate located below the water, making it difficult for rainwater flowing from the above-water side to enter the gap from the joint.

In the invention of claim 3, the roof plate support surface portion is configured to be lower than the bottom surface portion and the side surface portion, so that the bottom surface portion of the folded roof plate located above the water side and the bottom surface portion of the folded roof plate located adjacent to it on the water side can be made to be approximately the same surface, making the step at the joint less noticeable and giving it a neat appearance. In the invention of claim 4, the first step portion and the second step portion are configured to be formed on the top surface portion, making it easier to connect adjacent folded roof plates on the above-water side and below-water side.

In the invention of claim 5, a lower connection area portion is provided on one longitudinal side of both the belowwater side and the abovewater side of the folded roof panels, and an upper connection area portion is provided on the other side, which is extremely suitable for constructing a folded roof having multiple joint portions by connecting a large number of roof panels in series from the abovewater side to the belowwater side.

Furthermore, if a bulging ridge is formed in the band-shaped shallow recess in the lower connection area of the folded roof panel located below the water, along the width direction perpendicular to the longitudinal direction of the folded roof panel, when rainwater attempts to enter the gap formed by the band-shaped shallow recess, the bulging ridge will act as a dam for the rainwater, preventing the rainwater in the gap from entering the rear side above the water, which is the longitudinal rear side.

Furthermore, when using bulging ridges to install band-shaped sealing material in gaps created by band-shaped shallow recesses, it is preferable to install it in a predetermined position within the band-shaped shallow recess. However, in order for workers to install the material in a uniform position, they must measure the position with a ruler or the like and then install the band-shaped sealing material. However, by forming bulging ridges in predetermined positions when manufacturing the corrugated roof panels, the installation positions of the band-shaped sealing material can be standardized.

In addition, if the bulging ribs are formed separately and independently on the step bottom surface and both step side surfaces, the bulging ribs formed on the step bottom surface and the step side surfaces do not interfere with each other when the bulging ribs are press-formed in the band-shaped shallow recess of the folded roof panel. Therefore, the present invention can prevent cracks caused by stress caused by the bulging ribs interfering with each other during forming. In addition, the bulging ribs are formed in a semicircular cross section perpendicular to the longitudinal direction, so that the bulging ribs can be extremely easily press-formed while minimizing stress on the metal material.

1A is a schematic plan view, with some parts omitted, of a first embodiment of the present invention, and FIG. 1B is a schematic longitudinal sectional side view of the first embodiment. (A) is an oblique view of an attempt to connect a folded-plate roof panel located on the belowwater side to a folded-plate roof panel located on the abovewater side at a joint location in the first embodiment of the present invention, and (B) is a longitudinal side view of an attempt to connect a folded-plate roof panel located on the belowwater side to a folded-plate roof panel located on the abovewater side. (A) is an oblique view of the state in which a folded plate roof panel located on the belowwater side and a folded plate roof panel located on the abovewater side are connected at the joint location in the first embodiment of the present invention, (B) is a planar oblique view of the state in which a folded plate roof panel located on the belowwater side and a folded plate roof panel located on the abovewater side are connected at the joint location, (C) is an X1-X1 arrow view of (B), and (D) is a schematic diagram of the state in which a large number of folded plate roof panels are connected in series from the abovewater side to the belowwater side. 1A is an oblique view of a main part of a folded roof panel located below the water at the joint in the first embodiment of the present invention, (B) is a planar oblique view of a main part of a folded roof panel located below the water at the joint, and (C) is a cross-sectional view taken along the X2-X2 arrow in (B). 4B, (B) is an enlarged view of the end surface as viewed from the Y2-Y2 arrow in FIG. 4B, (C) is an enlarged view of the end surface as viewed from the Y3-Y3 arrow in FIG. 4B, (D) is a longitudinal front view of the state in which the lower run portion of the folded roof panel located above the water overlaps with the cut portion of the lower run portion of the folded roof panel located below the water at the joint portion, (E) is a longitudinal front view of the main parts in a state in which the folded roof panels adjacent in the width direction are joined by tightening the lower run portion and the upper run portion, and (F) is a cross-sectional view of the Y4-Y4 arrow in FIG. 4B. 3A is a cross-sectional view taken along the line X4-X4 of FIG. 3B, FIG. 3B is an enlarged view of the (α) portion of (A), and FIG. 3C is an enlarged view of the (β) portion of (B). (A) is a partially omitted perspective view of a folded roof panel located above the water at the joint, (B) is a plan perspective view near the below-water side of a folded roof panel located above the water at the joint, and (C) is an oblique view of a folded roof panel having an upper connection area and a lower connection area in the first embodiment. 1A is a perspective view of a main part of a folded roof panel located on the underwater side at the joint in the second embodiment of the present invention, with a portion omitted; FIG. 1B is a partial plan perspective view of a folded roof panel located on the underwater side at the joint; and FIG. 1C is a cross-sectional view taken along the X3-X3 arrow in FIG. (A) is an oblique view of the state in which a folded roof panel located below the water and a folded roof panel located above the water are connected at the joint location in the second embodiment of the present invention, (B) is a planar oblique view of the state in which a folded roof panel located below the water and a folded roof panel located above the water are connected at the joint location, (C) is an X5-X5 arrow view of (B), and (D) is a schematic diagram of a state in which a large number of folded roof panels are connected in series from the above-water side to the below-water side.

The following describes an embodiment of the present invention with reference to the drawings. The present invention relates to a joint structure (joint structure) for a metal folded-plate roof having a slope, in which multiple folded-plate roof panels are connected in series in the longitudinal direction from the above-water side to the below-water side. The main components that make up the joint structure in the present invention include a folded-plate roof panel A1 located on the below-water side, adjacent to each other across the above-water side and below-water side, and a folded-plate roof panel A2 located on the above-water side. In addition, a strip-shaped sealing material 3 may be provided as necessary (see Figures 1 to 3).

The longitudinal direction of the folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline is the direction in which they extend when arranged from above the waterline to below the waterline when a folded-plate roof is constructed, and the width direction is the direction horizontally perpendicular to the longitudinal direction. The longitudinal and width directions of the folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline are shown in the main drawings.

The folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline are both fastened-type folded-plate roof panels made of metal. Furthermore, structural members 71, brackets 72, and retaining clips 73 are also included in the construction as components that make up the present invention (see Figure 1). The folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline are adjacent to each other along the inclination direction between the belowwater side and the abovewater side, and are connected to form a folded-plate roof.

The folded-plate roof panel A1 that is below the water and the folded-plate roof panel A2 that is above the water are in a relative positional relationship to each other. In other words, among adjacent folded-plate roof panels from above the water to below the water, if the adjacent folded-plate roof panel to any given folded-plate roof panel is located above the water, then that given folded-plate roof panel will be the folded-plate roof panel A1 that is below the water. Also, if the adjacent folded-plate roof panel to any given folded-plate roof panel is located below the water, then that given folded-plate roof panel will be the folded-plate roof panel A2 that is above the water.

Therefore, as shown in Figure 3 (D), when three or more folded roof panels are connected in series from above the water side to below the water side and multiple joints are provided, the folded roof panels located in between, except for the folded roof panels located at both ends above and below the water side, are folded roof panels that meet the requirements of both the folded roof panel A1 located below the water side and the folded roof panel A2 located above the water side. And when many folded roof panels are connected in series from above the water side to below the water side, most of the folded roof panels used are folded roof panels that meet the requirements of both the folded roof panel A1 located below the water side and the folded roof panel A2 located above the water side.

Therefore, in the description of the present invention, for ease of understanding, the adjacent folded-plate roof panels that are located below the water will be referred to as the folded-plate roof panel A1 located below the water, and the folded-plate roof panel that is located above the water will be referred to as the folded-plate roof panel A2 located above the water. However, depending on whether a given folded-plate roof panel forms a joint structure with another adjacent folded-plate roof panel above the water, or whether it forms a joint structure with another folded-plate roof panel below the water, the given folded-plate roof panel will be either the folded-plate roof panel A1 located below the water or the folded-plate roof panel A2 located above the water. Hereinafter, the folded-plate roof panel A1 located below the water will simply be referred to as the folded-plate roof panel A1 located below the water, and the folded-plate roof panel A2 located above the water will simply be referred to as the folded-plate roof panel A2 located above the water.

There are two embodiments of the present invention. First, the first embodiment will be described based on Figs. 1 to 7. The folded-plate roof panel A1 located below the water has a lower connection area J1 at its above-water end in the longitudinal direction. The folded-plate roof panel A2 located above the water has an upper connection area J2 at its below-water end in the longitudinal direction. The lower connection area J1 and the upper connection area J2 are areas that overlap with each other at the joint that constitutes the joint between the folded-plate roof panel A1 located below the water and the folded-plate roof panel A2 located above the water, and constitute the joint [see Figs. 1(B), 2, 3, etc.].

And, except for the above-water end and below-water end of the folded-plate roof, most of the folded-plate roof panels used in the present invention are essentially equipped with a lower connection area J1 and an upper connection area J2 on both the below-water end of the folded-plate roof panel A1 and the above-water end of the folded-plate roof panel A2. In other words, the below-water end of the folded-plate roof panel A1 has an upper connection area J2 near the below-water end, and a lower connection area J1 near the above-water end (see Figure 7 (C)).

As a result, in the many folded roof panels connected in series from above the water side to below the water side, many of the intermediate folded roof panels have a lower connection area J1 and an upper connection area J2, which allows for efficient connection of adjacent folded roof panels from above the water side to below the water side. In the folded roof panel A1 located below the water side and the folded roof panel A2 located above the water side, the other parts except for the lower connection area J1 and upper connection area J2 are the same as normal folded roof panels, so the symbols for each part are the same.

First, as shown in Figures 4 and 5, the folded roof panel A1 located below the water has inclined side sections 12, 12 formed on both sides of the bottom section 11 in the width direction, and top sections 13, 13 formed outward from the upper ends of both inclined side sections 12, 12, with a lower run section 14 formed from the outer end of one of the top sections 13 and an upper run section 15 formed from the outer end of the other top section 13.

The folded roof panel A2 located above the water has inclined side sections 12, 12 formed on both widthwise sides of the bottom section 11. The folded roof panel A1 located below the water and the folded roof panel A2 located above the water form a bottomed V-shape with their respective bottom sections 11 and inclined side sections 12, 12 (see Figure 5 (A)). Top sections 13, 13 are formed outward from the upper ends of the inclined side sections 12, 12, with a lower run section 14 formed from the outer end of one of the top sections 13 and an upper run section 15 formed from the outer end of the other top section 13.

Furthermore, the lower run portion 14 of each of the folded roof panel A1 located below the water and the folded roof panel A2 located above the water is formed with a run neck portion 14b that rises vertically or nearly vertically from one top surface portion 13, and a lower run fastening portion 14a is formed from the upper end of the run neck portion 14b (see Figures 5 (A) and (C)). Similarly, the upper run portion 15 is formed with a run neck portion 15a that rises vertically or nearly vertically from the other top surface portion 13, and an upper run fastening portion 15a is formed from the upper end of the run neck portion 15b (see Figure 5 (A)).

When connecting adjacent folded roof panels A1, A1 located below the waterline in the width direction, the upper fastening portion 15a of the upper fastening portion 15 of another folded roof panel A1 located below the waterline in the width direction is fastened so as to overlap the lower fastening portion 14a of the lower fastening portion 14, so that the folded roof panels A1 located below the waterline are connected in the width direction [see FIG. 5 (E)]. Similarly, the upper fastening portion 15a of the upper fastening portion 15 of another folded roof panel A2 located above the waterline in the width direction is fastened so as to overlap the lower fastening portion 14a of the lower fastening portion 14 of the folded roof panels A2 located above the waterline in the width direction, so that the folded roof panels A1 located below the waterline are connected in the width direction.

A band-shaped shallow recess 2 is formed in the lower connection area J1 of the folded roof panel A1 located below the waterline (see Figures 1, 2, 3(A) and 3(B)). The band-shaped shallow recess 2 has a stepped concave surface 2A, a first step 24 and a second step 25. The band-shaped shallow recess 2 is a portion that is formed by a press molding machine after the folded roof panel A1 is formed by a roll molding machine or the like. The band-shaped shallow recess 2 is provided in a certain area of the above-water end portion of the folded roof panel A1, extending across the bottom surface portion 11 and both side surface portions 12, 12 of the folded roof panel A1 so as to correspond to these.

The band-shaped shallow recess 2 is a band-shaped shallow groove-like recess formed on the above-water side of the longitudinal direction of the folded-plate roof panel A1, bulging downward and expanding in the longitudinal direction (see Figures 4 and 5 (F)). More specifically, the band-shaped shallow recess 2 is formed along the width direction on the above-water side of the folded-plate roof panel A1, in other words, formed so as to cross the folded-plate roof panel A1 at a right angle (i.e., in the width direction) (see Figures 4 and 5 (F)). The band-shaped shallow recess 2 is a portion that is one step lower in the vertical (height) direction than the bottom surface portion 11 and both side surfaces 12, 12. The cross-sectional shape along the longitudinal direction of the folded-plate roof panel A1 is formed into a substantially flat inverted trapezoid shape, a flat inverted gate shape, a dish shape, etc. (see Figures 2 (B) and 4 (C), etc.).

First, the band-shaped shallow recess 2 is configured to have a first step 24, a second step 25, a stepped concave surface 2A, and a roof panel support surface 2B. The first step 24 is provided at the underwater end of the band-shaped shallow recess 2, and the second step 25 is provided at a position closer to the abovewater end of the band-shaped shallow recess 2. The stepped floor surface 2A is located between the first step 24 and the second step 25, and the roof panel support surface 2B is located abovewater from the second step 25 (see Figures 2 and 4). More specifically, the first step 24 is formed at the abovewater end of the folded roof panel A1, and continues from the bottom surface 11 and both side surfaces 12, 12.

The first step 24 is formed on the above-water side of the longitudinal direction and along a direction perpendicular to the longitudinal direction (see Figures 2, 4, etc.). In the folded-plate roof panel A1 located below the water, the area above the water, with the first step 24 as the boundary, becomes the lower connection area J1 (see Figures 2, 4). The first step 24 is formed at the same time as the band-shaped shallow recess 2 is formed by press working. The first step 24 is formed as a step surface that slopes downward from the above-water ends of the bottom surface 11 and both side surfaces 12, 12. The band-shaped shallow recess 2 is configured to fit within the lower connection area J1, or in other words, the band-shaped shallow recess 2 is in the same area as the lower connection area J1.

Next, the stepped concave surface 2A in the band-shaped shallow recess 2 has a stepped bottom surface 21 and stepped side surface portions 22, and may have both stepped top surface portions 23, 23 as necessary (see FIG. 4). The stepped bottom surface 21 and both stepped top surface portions 23, 23 are configured to be located one step lower than the bottom surface portion 11 and both top surface portions 13, 13 in the normal area, with the first step portion 24 as the boundary. In addition, both stepped side surface portions 22, 22 are formed to extend one step outward from both sides of the normal side surface portions 12, 12 in the width direction via the first step portion 24 (see FIG. 4, FIG. 5 (A) and (F)).

The step dimension between the bottom surface 11 and the step bottom surface 21 by the first step 24 is equal to or greater than the thickness (plate thickness) of the metal material of the folded roof panel A1 located below the water, and preferably the step dimension is about twice the plate thickness of the metal material. Furthermore, a second step 25 is formed from the above-water end of the step concave surface 2A. The second step 25 is formed along a direction perpendicular to the longitudinal direction of the folded roof panel A1, just like the first step 24 (see Figures 2, 4, etc.).

The second step 25 is a step formed in an inclined manner from the above-water end of the stepped concave surface 2A toward the upper side. From the upper end of the second step 25, a roof panel support surface portion 2B is formed toward the above-water side (see Figures 2, 4, 6, etc.). The roof panel support surface portion 2B also has a bottom support surface 21a, a side support surface 22a, and a top support surface 23a.

The roof panel support surface portion 2B serves to support the bottom surface portion 11, both side surfaces 12, 12, and both top surfaces 13, 13 of the folded roof panel A2 located above the water from below when the lower connection area portion J1 of the folded roof panel A1 located below the water and the upper connection area portion J2 of the folded roof panel A2 located above the water are overlapped to form a joint portion (see Figures 6 (A) and (B)). The bottom support surface 21a, side support surface 22a, and top support surface 23a of the roof panel support surface portion 2B are flush with the bottom surface portion 11, both side surfaces 12, 12, and both top surfaces 13, 13 (including approximately flush surfaces). Alternatively, there are also embodiments in which the bottom support surface 21a, the side support surface 22a, and the top support surface 23a are lower than the bottom surface portion 11, both side surfaces 12, 12, and both top surface portions 13, 13.

In particular, in this embodiment, the bottom support surface 21a, the side support surface 22a, and the top support surface 23a are formed one plate thickness (including approximately one plate thickness) lower than the bottom surface portion 11, both side surfaces 12, 12, and both top surface portions 13, 13. When the lower connection area portion J1 of the folded-plate roof panel A1 located below the water surface and the upper connection area portion J2 of the folded-plate roof panel A2 located above the water surface are overlapped, the bottom surface portion 11, both side surfaces 12, 12, and both top surface portions 13, 13 of the folded-plate roof panel A1 and the folded-plate roof panel A2 become flush (approximately flush).

The band-shaped shallow recess 2 has a bulging ridge 26 formed along the width direction perpendicular to the longitudinal direction of the folded roof panel A1 (see Figures 1, 2, 3(A) to (C), 4, 5(F), etc.). The bulging ridge 26 is formed separately and independently on the step bottom surface 21 and both step side surfaces 22, 22 of the band-shaped shallow recess 2. The bulging ridge 26 may also be formed on both step top surfaces 23, 23. The bulging ridge 26 formed on the step bottom surface 21 is called the bottom bulging ridge portion 26a, the bulging ridge 26 formed on the step side surface 22 is called the side bulging ridge portion 26b, and the bulging ridge 26 formed on the step top surface 23 is called the top bulging ridge portion 26c (see Figures 4 and 5(F)).

As mentioned above, the bottom bulging ridges 26a, side bulging ridges 26b, and top bulging ridges 26c are not continuous with each other, but are formed as multiple independent bulging ridges 26 at the step bottom 21, step side 22, and step top 23. The bottom bulging ridges 26a, side bulging ridges 26b, and top bulging ridges 26c are each formed in a straight line, and are arranged in a line (or approximately in a line) at the same position in the longitudinal direction of the folded roof panel A1 (see Figures 4(A) and (B)).

The bottom bulging ridge portion 26a, the side bulging ridge portion 26b, and the top bulging ridge portion 26c are formed so that the cross section perpendicular to the longitudinal direction of the folded roof panel A1 is semicircular or flattened semi-elliptical, or is formed to have a rectangular or square cross section, or is formed to have a trapezoidal or triangular cross section. The bulging ridges 26 are formed separately on the step bottom portion 21, the step side portion 22, and the step top portion 23 as the bottom bulging ridge portion 26a, the side bulging ridge portion 26b, and the top bulging ridge portion 26c, respectively, so that the bulging ridges do not interfere with each other. Therefore, cracks caused by the bulging ridges 26 interfering with each other can also be prevented.

As described above, the bulging ribs 26 are formed separately on the step bottom surface 21, step side surface 22, and step top surface 23 of the band-shaped shallow recess 2, but they may be formed continuously across the step bottom surface 21, step side surface 22, and step top surface 23. In this case, when the continuous bulging ribs 26 are formed by press molding or the like, they must be formed so as not to cause cracks.

The height of the bulging ridges 26 (bottom bulging ridge portion 26a, side bulging ridge portion 26b, and top bulging ridge portion 26c) is set to be equal to or approximately equal to the height of the first step portion 24, or lower than the first step portion 24. In other words, when the lower connection area J1 of the folded roof panel A1 located below the water and the upper connection area J2 of the folded roof panel A2 located above the water are overlapped, the top of the bulging ridges 26 and the upper connection area J2 of the folded roof panel A2 located above the water are configured not to interfere with each other (see Figure 6).

The bottom bulging ridge portion 26a, side bulging ridge portions 26b, 26b, and top bulging ridge portions 26c, 26c of the bulging ridges 26 formed in the band-shaped shallow recess 2 overlap the lower connection area J1 of the folded-plate roof panel A1 located below the water and the upper connection area J2 of the folded-plate roof panel A2 located above the water. When rainwater tries to infiltrate into the gap S formed by the band-shaped shallow recess 2, the bulging ridges 26 act as a dam for this rainwater, preventing the rainwater in the gap S from infiltrating into the longitudinal rear side, which is the rear side above the water.

The bulging ridges 26 (bottom bulging ridge portion 26a, side bulging ridge portion 26b, and top bulging ridge portion 26c) formed in the band-shaped shallow recess 2 are preferably formed in a position closer to the underwater side in the longitudinal direction of the band-shaped shallow recess 2. However, the position at which the bulging ridges 26 are formed in the band-shaped shallow recess 2 can be set arbitrarily, and they may be formed in a position closer to the abovewater side in the longitudinal direction of the band-shaped shallow recess 2.

When installing the strip-shaped sealing material 3 in the gap S created by the strip-shaped shallow recess 2, it is preferable to install it accurately at a predetermined position within the strip-shaped shallow recess 2. In order to install the strip-shaped sealing material 3 in a uniform position, a worker must measure the specified position with a ruler or the like and install the strip-shaped sealing material 3.

Therefore, when manufacturing the folded roof panel A1, if the installation position of the band-shaped sealing material 3 in the band-shaped shallow recess 2 is predetermined, the bulging rib 26 is formed at that position, and the bulging rib 26 serves as a guide (marker) for positioning the band-shaped sealing material 3, reducing the positioning work required by workers, allowing the band-shaped sealing material 3 to be easily attached to the predetermined position, and the installation position of the band-shaped sealing material 3 in all folded roof panels A1, A1, ... to be unified.

In addition, the bulging rib 26 is formed in a semicircular cross section perpendicular to the longitudinal direction of the folded roof panel A1, so that when the folded roof panel A1 is formed from the metal plate material, the bulging rib 26 can be made extremely easy to press while minimizing excessive stress on the metal plate material (see Figure 6).

When the bulging rib 26 in the band-shaped shallow recess 2 serves as a positioning part for the installation position of the band-shaped sealing material 3, the band-shaped sealing material 3 is installed on the immediately downstream or upstream side of the bulging rib 26 (see Figure 6). Also, the band-shaped sealing material 3 may be installed on both the downstream and upstream sides of the bulging rib 26 (see Figure 6).

By installing the strip sealant 3 on both the below-water side and above-water side of the bulging rib 26, it is possible to achieve even stronger waterproofing. Furthermore, strip sealant 3 may be installed on both the below-water side and above-water side of the bulging rib 26, and a gel-like caulking agent or sealant may be filled between the strip sealant 3, 3. This allows even stronger waterproofing to be achieved.

Next, when the lower connection area J1 of the folded roof panel A1 located below the water surface and the upper connection area J2 of the folded roof panel A2 located above the water surface are overlapped, the band-shaped shallow recess 2 of the lower connection area J1 forms a gap S that is closed in the vertical direction and has an opening on the below water surface. The below water surface of the gap S is closed by the folded piece 16 of the folded roof panel A2, leaving a partial opening. This opening is called the gap k. The gap k becomes an opening that receives rainwater into the gap chamber S formed by the band-shaped shallow recess 2. The bending angle θ of the first step 24 is usually about 135 degrees (including approximately 135 degrees) with respect to the bottom surface 11 [see Figure 6 (C)].

The bending angle θ of the first step 24 may also be a gentle incline. Specifically, the bending angle θ of the first step 24 relative to the bottom surface 11 is a right angle that does not exceed 135 degrees. The bending angle θ of the first step 24 may also be a steep incline. Specifically, the bending angle θ of the first step 24 relative to the bottom surface 11 is an angle that exceeds 135 degrees and is close to a substantially right angle.

Then, rainwater that seeps into and accumulates in the gap S formed by overlapping the upper connection area J2 of the folded roof panel A2 located above the water during rainfall is discharged to the outside through the opening on the first step 24 side of the band-shaped shallow recess 2. By setting various bending angles θ of the first step 24 relative to the bottom surface 11, the size of the gap k can be set arbitrarily.

Then, the band-shaped sealing material 3 is arranged perpendicular or nearly perpendicular to the longitudinal direction of the folded-plate roof panel A1 located below the waterline on the step bottom surface 21, both step side surfaces 22, 22, and both step top surfaces 23, 23 of the band-shaped shallow recess 2 in the lower connection area J1. When the folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline are connected in a row in the longitudinal direction to form a joint, a nearly closed space is formed by the step bottom surface 21 and step side surface 22 in the lower connection area J1, the bottom surface 11 of the upper connection area J2, and the band-shaped sealing material 3 or band-shaped water-expansion material 4.

This space is called the gap S. The gap S may also be provided with a strip of water-expandable material 4 together with the strip of sealing material 3 (see Figures 8, 9 (A) and (B)). The strip of sealing material 3 is in the form of a roughly flat tape, and is attached to the step bottom surface 21, both step side surfaces 22, 22 and both step top surfaces 23, 23 at the longitudinal midpoint of the strip of shallow recess 2.

The band-shaped water-expandable material 4 is in the form of a flat tape, similar to the band-shaped sealing material 3, and is attached adjacent to and close to the step bottom surface 21, both step side surfaces 22, 22, and both step top surfaces 23, 23. The band-shaped sealing material 3 and the band-shaped water-expandable material 4 have an adhesive adhesive surface on the back side, and can be easily attached to the step bottom surface 21, both step side surfaces 22, 22, and both step top surfaces 23, 23 in the lower connection area J1.

Alternatively, the strip-shaped sealing material 3 and strip-shaped water-expandable material 4 may each have no adhesive surface and be attached using an adhesive. The strip-shaped water-expandable material 4 is made of a material that can absorb moisture and expand, and specifically, a nonwoven fabric that is absorbent and expandable is used. As described above, the strip-shaped sealing material 3 and strip-shaped water-expandable material 4 are provided in the lower connection area J1 of the folded-plate roof panel A1 located below the water, and the upper connection area J2 of the folded-plate roof panel A2 located above the water is superimposed on the lower connection area J1.

The band-shaped water-expansion material 4 absorbs moisture and expands, so that it adheres more firmly to the step bottom surface 21, step side surface 22, and bottom surface 11 in the gap S, improving sealing performance and preventing further intrusion of rainwater or moisture. By using the band-shaped sealing material 3 and the band-shaped water-expansion material 4 together, extremely strong waterproofing can be ensured. When the band-shaped water-expansion material 4 is provided in the lower connection area J1, it is preferable that the band-shaped sealing material 3 be located above the water than the band-shaped water-expansion material 4 (see Figures 8 and 9). Also, without being limited to this, the band-shaped water-expansion material 4 may be located above the water than the band-shaped sealing material 3.

In addition, at the joint between the folded-plate roof panel A1 located below the waterline and the folded-plate roof panel A2 located above the waterline, only the band-shaped sealant 3 may be used, and the band-shaped water-expansive material 4 may not be used. Furthermore, in some cases, only the band-shaped water-expansive material 4 may be used, and the band-shaped sealant 3 may not be used. When only one of the band-shaped sealant 3 or the band-shaped water-expansive material 4 is used, the choice of which one to use is determined arbitrarily based on the conditions of the building and its surrounding environment, etc.

In the first embodiment of the present invention, as shown in Figures 1 and 7, the folded roof panel A2 located above the water has folded pieces 16, 16, ... formed on the longitudinal underwater side and on the bottom surface 11, both side surfaces 12, 12 and both top surfaces 13, 13 in the upper connection area J2. The underwater side of the folded roof panel A2 located above the water is placed on the first step 24 of the folded roof panel A1 located below the water, and each folded piece 16 is placed at each first step 24. The folded pieces 16 are edge portions bent at an angle downward with respect to the bottom surface 11, edge portions bent at an angle so as to expand toward the outside in the width direction with respect to the side surfaces 12, and edge portions bent at an angle downward with respect to the top surface 13.

The length of the folded piece 16 in the direction along the longitudinal direction of the folded roof panel A2 located above the water is about 5 mm to about 10 mm, preferably about 7.5 mm. The inclination angle of the folded piece 16 with respect to the bottom surface 11, side surface 12, and top surface 13 is about 5 degrees to about 135 degrees with respect to the longitudinal extension line of the front surface (upper surface side) of the bottom surface 11, side surface 12, and top surface 13, preferably about 25 degrees or thereabouts. The values of the longitudinal dimension and inclination angle of the folded piece 16 may be set arbitrarily as appropriate depending on the conditions at the construction site.

Specifically, the tips of the bent pieces 16, 16, ... of the folded roof panel A2 located above the water are configured to bite into the corners of the first step 24 and the step side portion 22 of the band-shaped shallow recess 2 of the folded roof panel A1 located below the water, and the first step 24 and the step top surface portion 23 of the band-shaped shallow recess 2 of the folded roof panel A1 located below the water. This forms the gap S between the step bottom surface portion 21 of the folded roof panel A1 located below the water and the bottom surface portion 11 of the folded roof panel A2 located above the water at the joint between the lower connection area portion J1 of the folded roof panel A1 located below the water and the upper connection area portion J2 of the folded roof panel A2 located above the water (see Figures 3 and 7).

When rainwater seeps in through the joint, the gap S is structured so that even if the rainwater accumulates in the band-shaped shallow recess 2 of the lower connection area J1, particularly on the step bottom surface 21, it does not come into contact with the bottom surface 11 of the upper connection area J2 located above, making it difficult for capillary action to occur. This blocks the rainwater that seeps in through the joint within the gap S, preventing it from seeping into the room or leaking out. In addition, by using the band-shaped sealing material 3 or band-shaped water-expansion material 4 in combination, further rainwater infiltration can be firmly prevented.

In Fig. 1 and Fig. 9(D), the reference numeral 71 denotes structural materials such as beams and purlins, the reference numeral 72 denotes a bracket, the reference numeral 73 denotes a retaining clip for fastening, and the reference numeral 73a denotes a retaining clip tongue. The structural materials 71 and the retaining clip 72 may be located at a location other than the joint of the folded-plate roof panel A1 located below the water and the folded-plate roof panel A2 located above the water (see the solid line part in Fig. 1(B)), or at the joint (see the imaginary line part in Fig. 1(B)), and are set appropriately according to the situation. Fig. 5(E) shows the state in which the lower run part 14 and the upper run part 15 in the width direction of the folded-plate roof panel A1 on the below water side or the folded-plate roof panel A2 on the above water side are fastened together with the retaining clip tongue 73a of the retaining clip 73 attached to the bracket 72.

Next, in the second embodiment of the present invention, the bulging rib 26 is not provided in the band-shaped shallow recess 2 in the lower connection area J1 of the folded roof panel A1 located below the water (see Figures 8 and 9). In this embodiment, the configuration of the band-shaped shallow recess 2 in the lower connection area J1 can be made extremely simple.

A1 ... folded plate roof plate, A2 ... folded plate roof plate A2, 11 ... bottom surface portion, 12 ... side surface portion,
13: top surface portion, 14: lower run portion, 14c: cut portion, 15: upper run portion, 16: bent piece,
2...band-shaped shallow recess, 2A...step concave surface, 21...step bottom surface portion, 22...step side surface portion,
23: step top surface portion, 24: first step portion, 25: second step portion, 26: bulging ridge,
26a... bottom bulging ridge portion, 26b... side bulging ridge portion, 26c... top bulging ridge portion,
2B... roof panel support surface portion, 3... strip-shaped seal material, J1... lower connection area portion,
J2...upper connection region, S...space, K...gap.

Claims (5)

A joint structure on the above-water side and below-water side of a folded roof panel in which an inclined side portion is formed on both sides of the bottom portion in the width direction, a top portion is formed outward from the upper ends of both side portions, a lower run portion is formed from the outer end of one of the top portions, and an upper run portion is formed from the outer end of the other top portion, and a band-shaped shallow recess is provided on the above-water side of the longitudinal direction of the folded roof panel located on the below-water side, which bulges downward and expands in the longitudinal direction,
The band-shaped shallow recess has a stepped bottom surface portion that is lower than the bottom surface portion and a stepped side surface portion that is lower than the side surface portion, and a first step portion is formed at the longitudinal underwater end of the band-shaped shallow recess and along a width direction perpendicular to the longitudinal direction, extending downward and outward from the bottom surface portion and the side surface portion, a flat stepped concave surface is formed from the lower end of the first step portion, and a second step portion is formed extending upward from the abovewater end of the stepped concave surface,
The above -water end of the band-shaped shallow recess is formed with a roof panel support surface portion that is parallel to the bottom surface portion and both side surfaces, and the lower run portion has a lower connection area portion with a cut-out portion where the upper portion is cut out, and the folded plate roof panel located on the above-water side has an upper connection area portion on the underwater side in the longitudinal direction and at the ends of the bottom surface portion and both side surfaces, where a downwardly sloping folded piece is formed, and the lower connection area portion of the folded plate roof panel located on the below-water side and the upper connection area portion of the folded plate roof panel located on the above-water side are overlapped, and a gap is provided between the first step portion of the below-water end of the band-shaped shallow recess and the folded piece,
A joint structure for a folded roof panel, characterized in that two strip-shaped sealing materials are arranged between the lower connection area and the upper connection area along a width direction perpendicular to the longitudinal direction . The joint structure of the folded plate roof panel according to claim 1 , wherein the roof panel support surface portion is flush with the bottom surface portion and the side surface portion. The joint structure of the folded plate roof panel according to claim 1 , wherein the roof panel support surface portion is a surface lower than the bottom surface portion and the side surface portion. 4. The joint structure of the folded roof panel according to claim 1, 2 or 3 , wherein the first step portion and the second step portion in the lower connection area are formed on both top surfaces , and a downwardly inclined folded piece is formed at the end of both top surfaces . The joint structure of the folded roof panel according to any one of claims 1, 2, 3 or 4 , characterized in that the lower connection area portion is provided on one side of the longitudinal direction of the folded roof panel on the underwater side and the abovewater side, and the upper connection area portion is provided on the other side.

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