Drainage structure for roof

Abstract

PURPOSE: To provide a drainage structure for roofs which excels in drainage performance of rainwater and is easy to construct.CONSTITUTION: A downstream side edge part of an upstream side metal plate roof A1 and an upstream side edge part of a downstream side metal plate roof A2 are arranged in directions that intersect each other horizontally, and are configured so that a rainwater guide B covers a gap part S. An intermediate gutter 1, which has a deformed U-shaped cross section, is formed to have similar width relative to a longer direction, and is installed below the tip of the rainwater guide B of the intermediate gutter 1, along the inclination of the tip, on the downstream side metal plate roof A2, with a lower terminal in an inclination direction of the intermediate gutter 1 provided to lateral sides of the metal plate roof A. The intermediate gutter 1 is fastened to a gutter substrate member 2 and a chevron shaped reinforcement material 3 provided in a width direction of the downstream side metal plate roof A2 so that rainwater which flows into the intermediate gutter 1 from the rainwater guide B is discharged from the terminal of the intermediate gutter 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roof drainage structure that is excellent in rainwater drainage and easy to construct.

Background Art

[0002] Corrugated slates are often used as roofs for large buildings (such as warehouses or factories). As the slate roof material of the slate roof ages, the roof must be repaired. In recent years, in such repair work, the existing roof is often left as it is, and a new roof is constructed on top of the existing roof.

[0003] That is, since the existing roof remains as it is, the interior of the building can continue to be used even during the repair work. For example, if the building is a factory, workers can continue to work indoors even while the repair work is being carried out. Similarly, if the building is a warehouse, items can be stored even during the repair work.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a renovated roof, when the roof area is large, the area where rain hits becomes large. Therefore, when heavy rain falls intensively, the amount of rain flowing from the upper side to the lower side of the roof due to the roof gradient also becomes large. In the eaves gutter, the amount of rain exceeds the allowable capacity, and rainwater overflows from the eaves gutter, causing a large amount of moisture to adhere to the wall surface of the building and other places. If this continues for a long time, it will cause the building to deteriorate.

[0006] In order to prevent such a situation, Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-209627) exists. According to this Patent Document 1, an auxiliary gutter is provided on the roof so that rainwater can be drained well together with the eaves gutter. However, points that should be further improved have been found in the invention disclosed in Patent Document 1. Therefore, the object to be solved by the present invention is to realize a drainage structure of the roof in a further improved repaired roof.

Means for Solving the Problems

[0007] Therefore, as a result of the inventor's intensive research to solve the above problems, the invention of claim 1 is a metal plate roof composed of an upper water-side metal plate roof and a lower water-side metal plate roof having the same shape as the upper water-side metal plate roof and provided with a gap at a predetermined interval in the roof inclination direction, which is covered on an existing roof. In a roof provided with a eaves gutter or a valley gutter, the lower water-side end of the upper water-side metal plate roof and the upper water-side end of the lower water-side metal plate roof facing each other in the roof inclination direction are arranged in a direction horizontally crossing the width direction of the metal plate roof. A rainwater guide having the same cross-sectional shape as the upper water-side metal plate roof is configured to cover the upper surface of the gap portion in the horizontally crossing direction. The inclination of the rainwater guide is formed to be gentler than the inclination angle of the upper water-side metal plate roof. The lower water-side end of the rainwater guide is formed to obliquely cross the width direction of the rainwater guide. The intermediate gutter has a cross-sectionally deformed U-shape formed by a rainwater receiving rising portion, a bottom portion, and an upper water-side mounting portion, and is formed to have the same width in the longitudinal direction. The intermediate gutter is placed on the lower water-side metal plate roof below the tip portion of the rainwater guide and along the inclination of the tip of the rainwater guide. The lower end of the intermediate gutter in the lower position in the inclination direction is provided up to the side end of the metal plate roof. A mountain-shaped reinforcing member facing the roof inclination direction of the lower water-side metal plate roof is fixed to the lower water-side metal plate roof at a predetermined interval in the width direction of the lower water-side metal plate roof. The lower end of the rainwater guide closer to the lower end is placed on the upper water-side mounting portion of the intermediate gutter and fixed to a gutter base member provided in the width direction of the lower water-side metal plate roof fixed to the lower water-side metal plate roof. The gutter base member is also fixed to the mountain-shaped reinforcing member. The lower end of the gutter fixing member that supports the rainwater receiving rising portion of the intermediate gutter from the outside is fixed on the lower water-side metal plate roof and to the mountain-shaped reinforcing member. The rainwater flowing from the rainwater guide into the intermediate gutter is configured to be drained from the terminal of the intermediate gutter. By adopting the drainage structure of the roof characterized by the above, the above problems are solved.

[0008] The invention of claim 2 is a roof drainage structure according to claim 1, wherein the lower end of the rainwater guide formed to obliquely cross in the width direction of the rainwater guide is a stepped end formed by a horizontal side and a vertical side so as to match the aforementioned oblique direction, thereby solving the above problems.

[0009] The invention of claim 3 is a roof drainage structure according to claim 1 or 2, wherein the rainwater guide is composed of a rainwater guide body, and the upper end portion of the rainwater guide is attached in a superposed state below the lower end portion of the upper metal plate roof, thereby solving the above problems.

[0010] The invention of claim 4 is a roof drainage structure according to claim 3, wherein the gentle slope portion of the rainwater guide body is formed through a zigzag portion formed by unevenness, thereby solving the above problems. The invention of claim 5 is a roof drainage structure according to claim 3, wherein the gentle slope portion of the rainwater guide body is formed by curving the lower side of the rainwater guide body upward, thereby solving the above problems.

[0011] The invention of claim 6 is a roof drainage structure according to claim 1 or 2, wherein the upper metal plate roof has a structure in which its lower end and the rainwater guide portion which is the rainwater guide are integrated, thereby solving the above problems. The invention of claim 7 is a roof drainage structure according to claim 6, wherein the gentle slope portion of the rainwater guide portion is formed through a zigzag portion formed by unevenness, thereby solving the above problems. The invention of claim 8 is a roof drainage structure according to claim 6, wherein the gentle slope portion of the rainwater guide portion is formed by curving the lower side of the rainwater guide portion upward, thereby solving the above problems.

[0012] The invention according to claim 9 is a metal roof composed of an upper water-side metal plate roof and a lower water-side metal plate roof having the same shape as the upper water-side metal plate roof and provided with a gap at a predetermined interval in the roof inclination direction, which is covered on an existing roof. In a roof having a eaves gutter or a valley gutter, the lower water-side end of the upper water-side metal plate roof and the upper water-side end of the lower water-side metal plate roof facing each other in the roof inclination direction are placed in a direction horizontally crossing the width direction of the metal roof, and are configured to cover the upper surface of the gap portion in the horizontally crossing direction with a rainwater guide having the same cross-sectional shape as the upper water-side metal plate roof. The inclination degree of the rainwater guide is formed to be gentler than the inclination angle of the upper water-side metal plate roof. The intermediate gutter has a cross-sectionally deformed U-shape formed by a rainwater receiving rising portion, a bottom portion, and an upper water-side mounting portion. When viewed in a plane with respect to the longitudinal direction, the upper water-side mounting portion is horizontal, and the rainwater receiving rising portion is inclined. While the rainwater receiving rising portion of the intermediate gutter is the lower side of the roof, the upper water-side mounting portion is horizontally placed in the width direction of the lower water-side metal plate roof. The lower end of the rainwater receiving rising portion of the intermediate gutter in the inclined direction is provided up to the side end of the metal roof. A mountain-shaped reinforcing member facing the roof inclination direction of the lower water-side metal plate roof is fixed to the lower water-side metal plate roof at a predetermined interval in the width direction of the lower water-side metal plate roof. The lower end of the rainwater guide closer to the lower end is placed on the upper water-side mounting portion of the intermediate gutter and is fixed to a gutter base member provided in the width direction of the lower water-side metal plate roof fixed to the lower water-side metal plate roof. The gutter base member is also fixed to the mountain-shaped reinforcing member. The lower end of the gutter fixing member that supports the rainwater receiving rising portion of the intermediate gutter from the outside is fixed on the lower water-side metal plate roof and to the mountain-shaped reinforcing member. The rainwater flowing from the rainwater guide into the intermediate gutter is configured to be drained from the terminal of the intermediate gutter. By adopting the drainage structure of the roof characterized by this, the above problems are solved.

[0013] The invention according to claim 10 is the drainage structure of the roof according to claim 9, wherein the lower water-side end of the rainwater guide formed to obliquely cross in the width direction of the rainwater guide has a stepped end formed by a horizontal side and a vertical side so as to match the above-described oblique direction. By adopting the drainage structure of the roof characterized by this, the above problems are solved.

Effects of the Invention

[0014] In the invention of claim 1, with the configuration in which the upper water-side portion of the rainwater guide covering the upper water-side portion of the intermediate gutter is covered by the upper water-side metal plate roof, the rainwater flowing on the upper water-side metal plate roof can move to the rainwater guide without leaking to the back surface of the upper water-side metal plate roof as it is, and the rainwater guide can surely receive the flowing-down rainwater and discharge the rainwater to the intermediate gutter as it is. Further, the lower water-side end portion of the upper water-side metal plate roof is located above the upper water-side end portion of the rainwater guide, and it is possible to prevent dust, dead leaves, etc. flowing down together with the rainwater from smoothly moving to the rainwater guide and soiling the back surface side of the upper water-side metal plate roof and the rainwater guide.

[0015] Furthermore, by providing a gap between the lower water-side end portion of the upper water-side metal plate roof and the upper water-side end portion of the lower water-side metal plate roof, the weight of the metal plate roof can be reduced, so that it can offset the weight of the rainwater guide, and an increase in weight due to the rainwater guide can be suppressed. Further, since there is a gap between the upper water-side metal plate roof and the lower water-side metal plate roof, there is no continuity between the upper water-side metal plate roof and the lower water-side metal plate roof, and construction can be carried out from either the upper water-side metal plate roof or the lower water-side metal plate roof.

[0016] The lower water-side end portion of the upper water-side metal plate roof and the upper water-side end portion of the lower water-side metal plate roof facing each other in the roof inclination direction are arranged in a direction horizontally crossing in the width direction of the metal plate roof, so that the construction of the upper water-side metal plate roof and the lower water-side metal plate roof can be made easier. Further, the lower water-side end of the rainwater guide is formed so as to obliquely cross in the width direction of the rainwater guide, and the intermediate gutter has a cross-sectionally deformed U-shape formed by a rainwater receiving rising portion, a bottom portion, and an upper water-side mounting portion, and is formed to have the same width in the longitudinal direction thereof, and the shape and structure of the intermediate gutter can be made simple.

[0017] The intermediate gutter is configured to be placed on the lower side metal plate roof along the inclination of the tip (lower water side end) of the rainwater guide at the lower side (lower water side) of the tip of the rainwater guide, so that rainwater flowing down from the rainwater guide can surely flow into the intermediate gutter. The intermediate gutter arranged in an inclined state allows rainwater to flow from above the inclination to below the inclination and can drain from the end in the width direction (Y direction) of the roof. The intermediate gutter has the same cross-sectional shape perpendicular to its longitudinal direction (X direction) at any position and a constant width, and is extremely easy to install on the lower side metal plate roof.

[0018] In the invention of claim 2, the lower water side end of the rainwater guide formed to obliquely cross in the width direction of the rainwater guide is formed into a stepped end with a horizontal side and a vertical side so as to match the above-described oblique direction. By this configuration, it is extremely easy to make the shape of the lower water side end of the rainwater guide into a substantially inclined side shape by means of steps.

[0019] In the invention of claim 3, the upper water side metal plate roof and the rainwater guide body constituting the rainwater guide are different separate members. The upper end of the rainwater guide body constituting the rainwater guide is attached in a superposed state below the lower end of the upper water side metal plate roof (the back side). As a result, rainwater flowing down the upper water side metal plate roof can flow directly into the rainwater guide body without leaking to the existing roof side located below the upper water side metal plate roof. Then, the rainwater can flow well from the upper water side metal plate roof of the rainwater to the rainwater guide body and be sent directly into the intermediate gutter, enabling extremely good rainwater drainage.

[0020] In the invention according to claim 4, a zigzag portion formed by irregularities is formed at a location where the inclination changes in the rainwater guide body constituting the rainwater guide, whereby a gently inclined portion region and a roof inclined portion region having different inclination angles can be formed in the rainwater guide body extremely easily. In the invention according to claim 5, by curving the lower water side of the rainwater guide upward, a gently inclined portion region can be formed in the rainwater guide body extremely easily. In the invention according to claim 6, since the upper water side metal plate roof is structured such that a rainwater guide portion, which is a rainwater guide, is integrated with its lower end, the number of parts is reduced and construction can be carried out simply and in a short time.

[0021] In the invention according to claim 7, a zigzag portion provided with recesses and bulges is formed at a location where the inclination of the rainwater guide changes, whereby a gently inclined portion region and a roof inclined portion region having different inclination angles can be formed in the rainwater guide portion extremely easily. In the invention according to claim 8, a gently inclined portion region can be formed in the rainwater guide portion extremely easily.

[0022] In the invention according to claim 9, the upper water side metal plate roof, the lower water side metal plate roof, the lower water side end and the upper water side end of the rainwater guide can all be made horizontal along the roof width direction (X direction). Also, with a configuration in which only the rainwater receiving rising portion of the intermediate gutter is inclined, the entire intermediate gutter can be installed in a substantially horizontal state, resulting in a neat appearance and easy construction. In the invention according to claim 10, as described above, the lower water side end of the rainwater guide formed to diagonally cross in the width direction of the rainwater guide has a stepped end formed by a horizontal side and a vertical side so as to match the aforementioned diagonal direction, whereby the shape of the lower water side end of the rainwater guide can be made substantially in the shape of an inclined side extremely easily by means of a stepped shape.

Brief Description of the Drawings

[0023]

Figure 1

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Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the drainage structure of the roof in the present invention will be described with reference to the drawings. Further, the present invention mainly includes an upper water-side metal plate roof A1, a lower water-side metal plate roof A2, a rainwater guide B, an intermediate gutter 1, a gutter base member 2, a gable-shaped reinforcing member 3, and a gutter fixing member 4 [see Fig. 1(A)]. Furthermore, the present invention is premised on a renovated roof, and therefore, in addition to the above components, an existing roof C is added as a component. And the upper water-side metal plate roof A1 and the lower water-side metal plate roof A2 form a metal plate roof A as a whole of the building. In the present invention, for convenience of explanation, the X direction and the Y direction are used as expressions indicating directions.

[0025] The X direction is the width direction of the roof. In other words, it is a direction orthogonal and horizontal to the water flow direction from the upper side of the water to the lower side of the water (or from the lower side of the water to the upper side of the water), and is generally sometimes called the bay direction. Also, the Y direction is the inclination direction of the roof. In other words, it is the direction connecting the upper side of the water and the lower side of the water of the roof, and is a direction orthogonal to the width direction (bay direction) of the roof. In the description of the present invention, the X direction and the Y direction described for each of the main members all follow the X direction and the Y direction described in the drawings.

[0026] The above-described upper side metal plate roof A1, lower side metal plate roof A2, rainwater guide B, intermediate gutter 1, gutter base member 2, gable-shaped reinforcing material 3, and gutter fixing material 4 are all based on the state in which the metal plate roof A is constructed (refer to FIGS. 1(A), 2(A), 3(A), 4(A), etc.), and the X direction and the Y direction are applied in this reference state. The Y direction and the X direction are described in the main drawings. Also, in the present invention, the metal plate roof A is provided with an eaves gutter or a valley gutter. Since well-known general ones are used for the eaves gutter and the valley gutter, the description thereof is omitted.

[0027] There are a plurality of embodiments in the present invention. First, the first embodiment and the second embodiment of the present invention are outlined, and then the first embodiment and the second embodiment are described in detail. In the first embodiment, the rainwater guide B is composed of a rainwater guide body B1, and the upper end portion of the rainwater guide B is attached in a superposed state below the lower end portion of the upper side metal plate roof A1. Also, in the second embodiment, the upper side metal plate roof A1 has a structure in which its lower end and the rainwater guide portion B2 which is the rainwater guide B are integrated.

[0028] Next, the first embodiment of the present invention will be described. First, the upper water-side metal plate roof A1, the lower water-side metal plate roof A2, and the rainwater guide B will be described, and then the middle gutter 1, the gutter base member 2, the gable-shaped reinforcing member 3, and the gutter fixing member 4 will be described. The upper water-side metal plate roof A1, the lower water-side metal plate roof A2, and the rainwater guide B are substantially corrugated in the width direction (X direction). The upper water-side metal plate roof A1 is composed of a plurality of upper water-side roof plates 5, 5,... [see FIGS. 1(B) and 2], and the upper water-side roof plates 5 are formed from thin sheet metal materials [see FIG. 2(C)].

[0029] Among the plurality of upper water-side roof plates 5, 5,... that make up the upper water-side metal plate roof A1, those that are connected in the width direction in an appropriate number and have the lower-side end and the upper-side end aligned in the roof inclination direction are a set of upper water-side roof plates 5, 5,... that make up the upper water-side metal plate roof A1, and there are a plurality of such sets to form the upper water-side metal plate roof A1.

[0030] For the convenience of explanation of the present invention, for easier understanding, among the plurality of upper water-side roof plates 5, 5,..., a set is composed of two upper water-side roof plates 5, 5 that are connected in the width direction. However, the number of upper water-side roof plates 5 included in this set is not limited to two, and it may be composed of 3, 4, 5 to 10 or more upper water-side roof plates 5. Also, in the construction of a small-scale renovated roof, a set may be composed of one upper water-side roof plate 5.

[0031] In the state where the upper water-side metal plate roof A1 is constructed, in each upper water-side roof plate 5, the longitudinal direction, with the installed roof inclination direction as the Y direction. Also, the width direction orthogonal to the roof inclination direction is the X direction [see FIG. 2(C)]. That is, the longitudinal direction (Y direction), which is the inclination direction of the upper water-side metal plate roof A1, follows the flow direction of the roof (the direction from the upper water side to the lower water side), and in this state, it is arranged on the existing roof C.

[0032] The upper water-side roof board 5 has a substantially corrugated cross-section along the roof width direction (X direction). Specifically, it consists of a peak portion 51 and a bottom portion 52, and the peak portion 51 and the bottom portion 52 are alternately continuous along the width direction (X direction) to form a substantially corrugated shape [see FIGS. 2(B) and (C)]. And the peak portions 51, 51 at both ends in the width direction (X direction) of the adjacent upper water-side roof boards 5, 5 are overlapped, and the adjacent upper water-side roof boards 5, 5 are connected in the width direction (X direction) [see FIG. 2(B)].

[0033] The cross-sectional shape of the peak portion 51 is formed in a substantially trapezoidal shape, and inclined pieces are formed from both sides in the width direction of the top piece. Specifically, four peak portions 51, 51,... are formed on one upper water-side roof board 5 [see FIG. 2(C)]. Also, the bottom portion 52 is a flat surface, and a flat convex portion may be formed along the Y direction on the bottom portion 52. As described above, the upper water-side metal roof A1 is constructed from a plurality of upper water-side roof boards 5, 5,.... The underwater-side end portion of the upper water-side metal roof A1 is placed in a direction horizontally crossing the width direction (X direction) of the metal roof A.

[0034] Therefore, the underwater-side end portions of the upper water-side roof boards 5, 5,... constituting the upper water-side metal roof A1 are aligned to be horizontal and straight in the width direction (X direction) of the metal roof A. Specifically, when a plurality of sets of the upper water-side roof boards 5, 5 as a set are arranged in the roof width direction (X direction), the underwater-side end portions of the upper water-side roof boards 5 of each set are configured to be in a horizontal straight line along the width direction (X direction) [see FIGS. 9(E), (F), FIGS. 14(A), (A1), (B), (B1)].

[0035] Next, the lower water-side metal roof A2 is composed of a plurality of lower water-side roof boards 6, 6,.... The lower water-side roof board 6 has the same shape as the upper water-side roof board 5 and the same cross-sectional shape in the width direction [see FIG. 2(C)]. The lower water-side roof board 6 is formed from a thin metal material, has a substantially corrugated shape along the roof width direction (X direction), and consists of a peak portion 61 and a bottom portion 62, and the peak portion 61 and the bottom portion 62 are alternately continuous in the width direction (X direction) [see FIG. 2(C)].

[0036] Then, the gable portions 61, 61 at both ends in the width direction (X direction) of the adjacent underwater roof plates 6, 6 are overlapped, and the adjacent underwater roof plates 6, 6 are connected in the width direction (X direction). The gable portion 61 is equivalent to the gable portion 51 of the upper water roof plate 5, and the cross-sectional shape is formed in a substantially trapezoidal shape, with inclined pieces formed on both sides in the width direction of the top piece. Specifically, similar to the upper water roof plate 5, four gable portions 61, 61,... are formed on the underwater roof plate 6.

[0037] A plurality of underwater roof plates 6 constituting the underwater metal roof A2 are configured to form a set with an appropriate number of them connected in the width direction. Then, in accordance with the upper metal roof A1, among the plurality of underwater roof plates 6, 6,... in the underwater metal roof A2, a set is composed of two underwater roof plates 6, 6 connected in the width direction. However, the number of underwater roof plates 6 included in this set is not limited to two, and it may be composed of three, four, five, up to ten or more underwater roof plates 6. Also, in the construction of a small-scale renovated roof, one underwater roof plate 6 may form a set.

[0038] As described above, the underwater metal roof A2 is constructed from a plurality of underwater roof plates 6, 6,.... The upper water end of the underwater metal roof A2 is placed in a direction horizontally crossing the width direction (X direction) of the metal roof A. Therefore, the upper water ends of the underwater roof plates 6, 6,... constituting the underwater metal roof A2 are aligned to be horizontal and linear in the width direction (X direction) of the metal roof A. Specifically, when a plurality of sets of the underwater roof plates 6, 6,... are arranged in the roof width direction (X direction), the upper water ends of each set of underwater roof plates 6, 6,... are configured to be in a horizontal straight line along the width direction (X direction) [see FIGS. 9(E), (F), FIGS. 14(A), (A1), (B), (B1)].

[0039] That is, the underwater end of the upper metal plate roof A1 and the upper end of the underwater metal plate roof A2 facing each other in the roof inclination direction (Y direction) are both in a straight line and horizontally cross in the width direction (X direction) of the metal plate roof A. The underwater end of the upper metal plate roof A1 and the upper end of the underwater metal plate roof A2 are parallel to each other, and a gap S is formed (see FIGS. 1(B), 4(A), and 14).

[0040] Furthermore, at the upper end in the longitudinal direction (Y direction) which is the inclination direction of the underwater roof plate material 6, the bottom surface 62 of this end portion is raised upward, and a rising wall portion 63 that serves as a weir by bending with respect to the inclined surface may be formed on the gable portion 61 (see FIG. 2(D)). This is to prevent the rainwater flowing into the bottom surface 62 of the underwater roof plate material 6 from overflowing from the upper end.

[0041] The plurality of upper roof plate materials 5, 5,... constituting the upper metal plate roof A1 and the plurality of underwater roof plate materials 6, 6,... constituting the underwater metal plate roof A2 are installed so as to have the same gradient or substantially the same gradient as the roof gradient in the roof inclination direction (Y direction) of the slate roof which is the existing roof C. Therefore, the inclination angles of the roof gradients of the upper metal plate roof A1 and the underwater metal plate roof A2 are equal or substantially equal (see FIG. 1).

[0042] Next, the rainwater guide B will be described. Basically, the upper end of the rainwater guide B is horizontal with respect to the roof width direction (X direction), and the underwater end of the rainwater guide B is formed so as to obliquely cross in the width direction (X direction) of the rainwater guide B. And the lower end side of the rainwater guide B is placed on the upper mounting portion 13 of the intermediate gutter 1. The above-described configuration of "obliquely crossing" means that the lower end of the rainwater guide B is in a state of descending from above to below along the roof width direction (X direction) from one end side to the other end side (see FIGS. 1(B), 2(A), 9(D), (E), (F), and 15).

[0043] When the lower water end of the rainwater guide B cuts obliquely, there are cases where it is in a stepped shape formed by a plurality of stepped portions gathering together, and cases where the lower water end of the rainwater guide B is formed in an inclined shape to form a continuous inclined side. In the case of the stepped shape, the lower water side end of the rainwater guide B formed to cut obliquely in the width direction of the rainwater guide B is formed into a stepped end portion 7t by a horizontal side 7m and a vertical side 7n so as to match the above-described oblique direction. The horizontal side 7m, the vertical side 7n, and the stepped end portion 7t will be described later.

[0044] The rainwater guide B is composed of a plurality of guide plate materials 7, 7,... (see FIGS. 1(B), 2(A), 9(D), (E), (F), etc.). The guide plate material 7 has the same shape as the upper water side roof plate material 5 and the lower water side roof plate material 6, and has the same cross-sectional shape in the roof width direction (X direction). That is, the guide plate material 7 is also formed from a thin sheet metal material, is substantially wavy along the roof width direction (X direction), and is composed of a peak portion 71 and a bottom portion 72, and the peak portion 71 and the bottom portion 72 are continuously alternated in the roof width direction (X direction) (see FIG. 5(A)).

[0045] Then, the peak portions 71, 71 at both ends in the width direction (X direction) of the adjacent guide plate materials 7, 7 in the width direction (X direction) are overlapped, and the adjacent guide plate materials 7, 7 are connected. The peak portion 71 is equivalent to the peak portions 51 and 61 of the upper water side roof plate material 5 and the lower water side roof plate material 6, and the cross-sectional shape is formed in a substantially trapezoidal shape, and inclined pieces are formed from both sides in the width direction of the top piece. Specifically, the guide plate material 7 is formed with four peak portions 71, 71,... in the same manner as the upper water side roof plate material 5 and the lower water side roof plate material 6.

[0046] There are two types of rainwater guides B, and one of them is the rainwater guide body B1. The rainwater guide body B1 is an independent and single structure different from the upper water side metal plate roof A1 and the lower water side metal plate roof A2. In addition to the rainwater guide body B1, there is also a rainwater guide portion B2 in the rainwater guide B. The rainwater guide portion B2 will be described later.

[0047] As described above, the rainwater guide B is formed by connecting a plurality of guide plate members 7, 7,... in the width direction. Therefore, the rainwater guide body B1 is also similarly formed by the guide plate members 7. And, in accordance with the upper water-side metal plate roof A1 and the lower water-side metal plate roof A2, among the plurality of guide plate members 7, 7,... that form the rainwater guide body B1, a pair is formed by connecting two of the guide plate members 7, 7 in the width direction. However, the number of guide plate members 7 included in this pair is not limited to two, and it may be composed of 3, 4, 5, up to 10 or more guide plate members 7. Also, in the construction of a small-scale renovated roof, it may be a set consisting of one guide plate member 7.

[0048] In this way, since the upper water-side roof plate member 5 that forms the upper water-side metal plate roof A1 and the guide plate member 7 that forms the rainwater guide body B1 are separate materials, with respect to the upper end portion (upper water-side end portion) in the longitudinal direction (Y direction) which is the roof inclination direction of the rainwater guide body B1 installed on the existing roof C, the lower end portion (lower water-side end portion) in the longitudinal direction (Y direction) of the upper water-side metal plate roof A1 is superposed so as to be positioned above, and it can be configured to be attached to the existing roof C in this superposed state [see FIGS. 4, 9(E) and (E1)].

[0049] That is, the ridge portion 51 and the bottom portion 52 of the roof plate member 5 that forms the upper water-side metal plate roof A1 and the ridge portion 71 and the bottom portion 72 of the guide plate member 7 that forms the rainwater guide body B1 are superposed in a substantially close contact state. And, the superposed portion between the lower end portion (lower water-side end portion) of the upper water-side metal plate roof A1 described above and the rainwater guide body B1 (upper water-side end portion) is aligned to be horizontal and linear in the width direction (X direction) of the metal plate roof A. Specifically, when a plurality of sets of the guide plate members 7, 7,... are arranged in the roof width direction (X direction) as a set, the upper water-side ends of each set of the guide plate members 7, 7,... are configured to be horizontal and linear along the width direction (X direction).

[0050] Then, by overlapping the lower end portion (underwater side end portion) in the longitudinal direction (Y direction) of the upper metal plate roof A1 with respect to the upper end portion (above water side end portion) in the longitudinal direction (Y direction) which is the roof inclination direction (Y direction) of the rainwater guide body B1, the rainwater flowing on the upper metal plate roof A1 can move to the rainwater guide body B1 without leaking out to the back surface of the upper metal plate roof A1 as it is, and the rainwater guide body B1 can receive the rainwater flowing down from the upper metal plate roof A1 surely and smoothly and let the rainwater flow out to the intermediate gutter 1 as it is. And, the underwater side end portion of the upper metal plate roof A1 is located above the upper water side end portion of the rainwater guide body B1, and it is possible to prevent dust, withered leaves, etc. flowing down together with the rainwater from smoothly moving to the rainwater guide body B1 and the back surface sides of the upper metal plate roof A1 and the rainwater guide body B1 from being soiled.

[0051] The plurality of guide plate materials 7, 7,... of the rainwater guide body B1 are formed such that the inclination degree of the underwater side portion from the center downward along the longitudinal direction (Y direction) which is the roof inclination direction is slightly gentler than the inclination degree of the upper metal plate roof A1. The gentle inclination portion of the guide plate material 7 of the rainwater guide B is referred to as a gentle inclination portion 7k. The inclination angle of the gentle inclination portion 7k of the rainwater guide B is smaller and gentler than the inclination angles of the roof slopes of the upper metal plate roof A1 and the lower metal plate roof A2 (see FIGS. 1(A), 3(A), (B), 4, etc.).

[0052] The rainwater guide body B1 serves to receive the rainwater flowing down from the upper metal plate roof A1 of the metal plate roof A by the guide plate material 7 constituting the rainwater guide body B1 and flow it into the intermediate gutter 1 described later. Therefore, the gentle inclination portion 7k of the guide plate material 7 is inclined so as to go downward from the upper side to the lower side. The gentle inclination portion 7k is formed by forming a substantially bellows-shaped zigzag portion 73 provided with recesses and bulges at 71 mountain-shaped portions (see FIG. 4).

[0053] The zigzag portion 73 formed by convex and concave is formed at a substantially middle position in the longitudinal direction (Y direction) which is the roof inclination direction of the chevron portion 71. Specifically, a recessed portion 73a having a flat V-shaped cross section along the width direction (X direction) is formed at the top of the chevron portion 71, and bulging portions 73b having a triangular convex cross section along the width direction (X direction) are formed on the inclined surfaces on both sides in the width direction of the top. These recessed portion 73a and bulging portions 73b are adjacent and continuous in the longitudinal direction (Y direction), and constitute the bellows-shaped zigzag portion 73.

[0054] And the gentle inclination portion 7k of the rainwater guide body B1 is formed via the zigzag portion 73. Specifically, the chevron portion 71 of the guide plate material 7 is bent by the zigzag portion 73, and the inclination angle changes with the zigzag portion 73 as a boundary, so that the portion of the gentle inclination portion 7k and the portion of the roof inclination portion 7h can be formed [see Fig. 4(C)]. The roof inclination portion 7h of the guide plate material 7 is a portion having the same roof inclination angle as the upper water-side metal plate roof A1 and the lower water-side metal plate roof A2.

[0055] The plurality of zigzag portions 73, 73,... of the rainwater guide body B1 are aligned horizontally and linearly in the width direction (X direction) of the metal plate roof A. Specifically, when a plurality of sets of the zigzag portions 73, 73,... of the guide plate materials 7, 7,... constituting the rainwater guide body B1 are arranged in the roof width direction (X direction), the zigzag portions 73, 73,... are configured to be horizontally in a straight line along the roof width direction (X direction).

[0056] Therefore, in the rainwater guide body B1, the formation starting point on the upper water side of the gentle inclination portion 7k is horizontally in a straight line along the roof width direction (X direction). In order to show that the formation starting point on the upper water side of the gentle inclination portion 7k is horizontally in a straight line along the roof width direction (X direction), a horizontal reference line L is shown in Fig. 5, and it is shown that the zigzag portions 73, 73,... are arranged on the horizontal reference line L. The horizontal reference line L is a horizontal line along the X direction which is the roof width direction.

[0057] Furthermore, as a means of forming the gentle slope portion 7k of the guide plate material 7 that constitutes the rainwater guide body B1, the gentle slope portion 7k of the rainwater guide body B1 is formed by curving the underwater side of the rainwater guide body B1 upward. Specifically, the underwater side in the longitudinal direction (Y direction) of the guide plate material 7 that constitutes the rainwater guide body B1 is curved, and this curved portion constitutes the gentle slope portion 7k.

[0058] This is to make the guide plate material 7 that constitutes the rainwater guide body B1 have a downward convex arc shape on the underwater side, that is, an arc-shaped warp is formed along the longitudinal direction (Y direction) (see Fig. 10). The warped portion of this guide plate material 7 is taken as the gentle slope portion 7k. When the gentle slope portion 7k is formed through warping, there is no clear boundary between the roof slope portion 7h and the gentle slope portion 7k, and the roof slope portion 7h is continuous with the gentle slope portion 7k through a predetermined change region from the roof slope portion 7h to the gentle slope portion 7k.

[0059] And the gentle slope portion 7k formed as the warped portion is preferably set as the region on the lower side from the substantially middle position in the longitudinal direction (Y direction) which is the roof slope direction of the guide plate material 7. The gentle slope portion 7k formed as the arc-shaped warped portion is formed by the gutter base member 2 described later lifting the vicinity of the underwater side end of the guide plate material 7 upward (see Fig. 11(B), Fig. 13(A), (B)).

[0060] Alternatively, it may also be formed by providing a convex circular arc-shaped kink that protrudes downward in the region below the middle position in the longitudinal direction (Y direction) of the guide plate material 7. In the embodiment where the gentle slope portion 7k is the warped portion, the formation starting point on the upper side of the gentle slope portion 7k is set to be aligned along a horizontal straight line (horizontal reference line L) in the roof width direction (X direction) (see Fig. 13(C)).

[0061] In the rainwater guide body B1, its upper water end is horizontal and linear with respect to the roof width direction (X direction) of the metal plate roof A. That is, the upper water ends of each set of guide plate materials 7, 7,... constituting the rainwater guide body B1 are aligned horizontally and linearly. The lower water end of the rainwater guide body B1 is an end that inclines in a stepped shape [refer to FIGS. 2(A), 9(D), (E), (F)] or in an inclined side shape (refer to FIG. 15). The inclination angle θ of the lower water side end of this rainwater guide body B1 is configured to be equal to the inclination angle θ in the state where it is placed on the lower water side metal plate roof A2 of the intermediate gutter 1 described later. The configurations of the rainwater guide body B1 and the intermediate gutter 1 will be described later.

[0062] Next, the intermediate gutter 1 will be described. First, the compositional relationship between the intermediate gutter 1, the upper side metal plate roof A1, the lower side metal plate roof A2, and the rainwater guide B will be outlined and then described in detail. First, the lower water side end of the upper side metal plate roof A1 and the upper water side end of the lower side metal plate roof A2 facing each other in the roof inclination direction are placed in a direction horizontally crossing the width direction of the metal plate roof A. The upper surface of the gap portion S in the horizontally crossing direction is covered with a rainwater guide B having the same cross-sectional shape as the upper side metal plate roof A1 (refer to FIGS. 1 and 4(A)). The inclination of the rainwater guide B is formed to be less inclined than the inclination angle of the upper side metal plate roof A1, and the lower water side end of the rainwater guide B is formed to cross obliquely in the width direction (X direction) of the rainwater guide B [refer to FIGS. 1(B), 2(A), 9(D), (E), (F)].

[0063] The intermediate gutter 1 has a cross-sectionally deformed U shape with a rainwater receiving rising portion 11, a bottom portion 12, and an upper side attachment portion 13 [refer to FIGS. 6(A), (C)], and is formed to have the same width in the longitudinal direction [refer to FIG. 6(B)]. Then, it is placed on the lower side metal plate roof A2 below the tip portion of the rainwater guide B of the intermediate gutter 1 and along the inclination of the tip of the rainwater guide B, and the lower end in the inclination direction of the intermediate gutter 1 is provided up to the side end of the metal plate roof A [refer to FIG. 2(A)]. The mountain-shaped reinforcing material 3 facing the roof inclination direction of the lower side metal plate roof A2 is fixed to the lower side metal plate roof A2 at predetermined intervals in the width direction of the lower side metal plate roof A2 (refer to FIG. 3).

[0064] On the upper water side mounting portion 13 of the middle gutter 1, the lower end side of the rainwater guide B is placed while being fixed to the gutter base member 2 provided in the width direction (X direction) of the lower water side metal plate roof A2 fixed to the lower water side metal plate roof A2. The gutter base member 2 is also fixed to the mountain-shaped reinforcing member 3 (see FIG. 3). The lower end of the gutter fixing member 4 that supports the rainwater receiving rising portion 11 of the middle gutter 1 from the outer surface is fixed on the lower water side metal plate roof A2 and to the mountain-shaped reinforcing member 3. The rainwater that has flowed into the middle gutter 1 from the rainwater guide B is configured to be drained from the terminal of the middle gutter 1.

[0065] As described above, the middle gutter 1 is formed in a cross-sectionally deformed U shape by the rainwater receiving rising portion 11, the bottom portion 12, and the upper water side mounting portion 13, and is formed to have a constant width with respect to the longitudinal direction (X direction) (see FIGS. 6(A), (B), (C)). Therefore, the rainwater receiving rising portion 11 and the upper water side mounting portion 13 are linear and parallel (including substantially parallel). The longitudinal direction of the rainwater guide B is along the substantially X direction. The rainwater receiving rising portion 11 is a rising portion located on the lower water side in the direction orthogonal to the longitudinal direction. The bottom portion 12 is equal to the inclination angle of the lower water side metal plate roof A2, and is set so that the rainwater receiving rising portion 11 is substantially vertical in a state where the middle gutter 1 is placed on the lower water side metal plate roof A2 (see FIG. 6(B)).

[0066] The upper water side mounting portion 13 is configured to be located on the upper water side in the direction orthogonal to the longitudinal direction of the middle gutter 1. The upper water side mounting portion 13 is formed with a steep inclined surface 13a that is steeper than the bottom portion 12. Above the upper end of the steep inclined surface 13a, a substantially vertical vertical wall surface 13b is formed, and above the upper end of the vertical wall surface 13b, a substantially horizontal mounting top surface 13c is formed. The mounting top surface 13c is a portion fixed to the gutter base member 2 described later (see FIG. 3(B)).

[0067] The intermediate gutter 1 is formed as an integral part, and its length is determined according to the roof width direction (X direction) of the renovated roof. Alternatively, the intermediate gutter 1 can be separated into a plurality of pieces along the longitudinal direction (X direction), and these separated pieces can be connected and used as a desired length. The intermediate gutter 1 placed on the underwater metal plate roof A2 is placed in a direction that obliquely crosses the width direction of the underwater metal plate roof A2 with the rainwater receiving rising part 11 as the underwater side (see FIGS. 1(B), 2(A), 9(E), (F), 14(B), (B1)).

[0068] That is, the longitudinal direction (X direction) of the intermediate gutter 1 placed on the underwater metal plate roof A2 has an inclination angle θ with respect to the width direction (X direction) of the underwater metal plate roof A2. The inclination angle θ of the intermediate gutter 1 is equal to the inclination angle that obliquely crosses the width direction (X direction) on the underwater side of the rainwater guide B, that is, the rainwater guide body B1. The inclination of the underwater side end of the rainwater guide plate B1 and the respective inclination angles θ of the intermediate gutter 1 are based on the horizontal reference line L. Therefore, the horizontal reference line L is also shown in the drawings where the inclination angle θ is shown.

[0069] Specifically, the intermediate gutter 1 is placed on the underwater metal plate roof A2 in a gently inclined state so as to slope downward from above (the water upper side) to below (the water lower side) along the roof inclination direction (Y direction) along the roof width direction (X direction) of the underwater metal plate roof A2. The inclination angle θ of the intermediate gutter 1 placed on the underwater metal plate roof A2 with respect to the width direction (X direction) of the underwater metal plate roof A2 may be an extremely small angle as long as rainwater can flow down.

[0070] Specifically, the inclination angle θ may be an inclination angle of about 0.5 degrees or so and numerical values around it. Therefore, the inclination angle θ is close to the horizontal, and when looking at the intermediate gutter 1 placed on the underwater metal plate roof A2, it may appear to be substantially horizontal with respect to the roof width direction (X direction). However, in the drawings, the inclination angle of the intermediate gutter 1 placed on the underwater metal plate roof A2 is shown with the numerical value of the inclination angle θ increased by about 2 to 3 times for easy understanding.

[0071] The gutter base member 2 is long in the longitudinal direction (X direction), and its longitudinal direction (X direction) is installed along the width direction (X direction) of the underwater metal plate roof A2 [see FIGS. 1(A), 3(A), (B), 8(C), (C1)]. Further, the length of the gutter base member 2 in the longitudinal direction (X direction) is substantially equal to the length in the width direction (X direction) of a set of underwater roof plate members 6, 6 constituting the underwater metal plate roof A2 [see FIGS. 8(C), (C1)]. Here, since two underwater roof plate members 6, 6 are taken as a set, the length of the gutter base member 2 in the longitudinal direction (X direction) is substantially equal to the width direction of the underwater roof plate members 6, 6 connected in the width direction.

[0072] In the cross-section orthogonal to the longitudinal direction (X direction) of the gutter base member 2, that is, in the Y-direction cross-section, a base portion 21 having a substantially trapezoidal cross-section is formed at the center, and attachment pieces 22, 22 are formed on both sides in the width direction orthogonal to the longitudinal direction of the base portion 21. Then, the attachment pieces 22, 22 of the gutter base member 2 are installed on the ridge portion 61 of the underwater roof plate member 6 constituting the underwater metal plate roof A2, and the gutter base member 2 is fixed to the underwater metal plate roof A2 with a fixing tool such as a screw. Further, the longitudinal direction (X direction) of the gutter base member 2 is installed so as to be orthogonal to the longitudinal direction (Y direction) of the ridge portion 61 of the underwater roof plate member 6 [see FIGS. 8(C), (C1)].

[0073] Here, a mountain-shaped reinforcing member 3 is accommodated in the inner surface (inner side) of the ridge portion 61 of the underwater roof plate member 6 where the gutter base member 2 is installed, and the attachment pieces 22, 22 of the gutter base member 2 are fixed to the mountain-shaped reinforcing member 3 with a fixing tool such as a screw through the ridge portion 61 [see FIG. 3(D)]. That is, the gutter base member 2 is also firmly supported by the mountain-shaped reinforcing member 3 together with the ridge portion 61 of the underwater roof plate member 6 (see FIG. 3). Although not particularly shown, the mountain-shaped reinforcing member 3 may be placed and fixed on the outer surface (upper side) of the ridge portion 61 of the underwater roof plate member 6.

[0074] As described above, the length of the gutter base member 2 in its longitudinal direction (X direction) is formed to be substantially equal to the length in the width direction (X direction) of a pair of underwater roof plates 6, 6 connected in the width direction of the underwater metal plate roof A2. A plurality of gutter base members 2 are fixed to the upper end portion (underwater end portion) of the underwater metal plate roof A2 (see FIGS. 8(C) and (C1)). The lower end portion (underwater end portion) of the guide plate material 7 of the rainwater guide body B1 and the mounting top surface 13c of the upper water mounting portion 13 of the intermediate gutter 1 are placed on the top surface 21a of the base portion 21 of the gutter base member 2 and fixed with a fixing tool such as a screw (see FIG. 3(B)).

[0075] The mountain-shaped reinforcing member 3 is long in the longitudinal direction (Y direction) which is the roof inclination direction, and is fixed on a continuous base material 91 described later. The length of the mountain-shaped reinforcing member 3 in the longitudinal direction (Y direction) is the length of the installation position of the gutter base member 2 and the range of the installation position in the flow direction (Y direction) of a gutter fixing member 4 described later (see FIG. 3(A)). The cross-sectional shape of the mountain-shaped reinforcing member 3 perpendicular to the longitudinal direction (Y direction) is substantially a hat shape, with reinforcing convex portions 31 and mounting pieces 32, 32 formed on both sides in the width direction (X direction) of the reinforcing convex portions 31, and the mounting pieces 32, 32 are fixed to the continuous base material 91 with a fixing tool such as a screw (see FIG. 3(D)).

[0076] Then, the mountain-shaped portion 61 of the underwater roof plate 6 constituting the underwater metal plate roof A2 is covered on the reinforcing convex portion 31 of the mountain-shaped reinforcing member 3, and the underwater metal plate roof A2 is installed on the existing roof C via the continuous base material 91. That is, at the position of the underwater metal plate roof A2 where the intermediate gutter 1, the gutter base member 2, and the gutter fixing member 4 are arranged, the mountain-shaped portion 61 of the underwater metal plate roof A2 is reinforced by the mountain-shaped reinforcing member 3 from the lower surface side, and the support members 41 of the gutter base member 2 and the gutter fixing member 4 are firmly fixed on the mountain-shaped portion 61, and it serves to install the intermediate gutter 1 on the underwater metal plate roof A2 in a stable state (see FIG. 3).

[0077] The gutter fixing member 4 serves to fix the intermediate gutter 1 placed on the underwater metal plate roof A2 to the lower metal plate roof A2 (see FIGS. 1(A), 3(A) to (C)). The gutter fixing member 4 is composed of a support member 41 and a tension member 42. The support member 41 is formed by bending a strip-shaped metal plate. The support member 41 consists of a mounting base 41a, a rising portion 41b, and a locking portion 41c, and forms a substantially L-shaped (or inverted L-shaped) by the mounting base 41a and the rising portion 41b.

[0078] The mounting base 41a is arranged on the ridge portion 61 of the underwater roof plate material 6 constituting the underwater metal plate roof A2, and is fixed to the underwater metal plate roof A2 with a fixing tool such as a screw, whereby the support member 41 is fixed on the underwater metal plate roof A2 (see FIGS. 3(A), (C)). The rising portion 41b serves to support the rainwater receiving rising portion 11 of the intermediate gutter 1 placed on the underwater metal plate roof A2 so as to suppress it from below. The locking portion 41c locks to the upper end of the rainwater receiving rising portion 11 of the intermediate gutter 1 and serves to firmly support the intermediate gutter 1 (see FIGS. 3(A), (C)).

[0079] The tension member 42 is made of a metal material and has a strip shape. The tension member 42 is arranged between the locking portion 41c of the support member 41 and the underwater end portion of the rainwater guide body B1 (see FIGS. 3(A), (B), (C)). One end (underwater end) in the longitudinal direction (Y direction) of the tension member 42 is fixed to the locking portion 41c of the support member 41 with a fixing tool such as a screw, and the other end (upper water end) is fixed to the underwater end portion of the rainwater guide body B1 by fixing with a screw or the like.

[0080] In this way, the support member 41 prevents the intermediate gutter 1 from falling due to the pressure of rainwater applied to the rainwater receiving rising portion 11 of the intermediate gutter 1, and firmly fixes the intermediate gutter 1 to the underwater metal plate roof A2. A plurality of support members 41 are provided and are attached at substantially equal intervals along the longitudinal direction (X direction) of the intermediate gutter 1 placed on the underwater metal plate roof A2 (see FIGS. 2(A), 9(F)).

[0081] Next, the process of implementing the first embodiment of the present invention will be described. FIG. 7 shows the construction process in the first embodiment divided into steps (1) to (6) as seen from the side in only the Y direction connecting the water surface side and the underwater side. FIGS. 8 and 9 show eight steps of the construction process from (A) to (F) as seen in plan view.

[0082] First, on the existing roof C such as a corrugated slate of a sine curve, a continuous base material 91 is installed at predetermined intervals along the width direction (X direction) in parallel [see FIG. 8(A)]. Next, the mountain-shaped reinforcing material 3 is fixed to the adjacent continuous base materials 91, 91 with a fixing tool such as a screw so that its longitudinal direction (Y direction) is along the flow direction (Y direction) of the existing roof C [see FIGS. 7(1), 8(A), (A1)].

[0083] Next, the underwater roof plate material 6 constituting the underwater metal roof A2 is installed and fixed to the continuous base material 91 [see FIGS. 7(2), 8(B), (B1)]. At this time, the peak portion 61 of the underwater roof plate material 6 is installed so as to cover the mountain-shaped reinforcing material 3. In this way, the underwater metal roof A2 is constructed from a plurality of underwater roof plate materials 6, 6,.... As described above, the underwater roof plate materials 6, 6,... are installed on the water surface side of the underwater metal roof A2 so as to be horizontal and straight in the width direction (X direction) of the metal roof A.

[0084] Next, the gutter base member 2 is installed and fixed at the upper end portion (water surface side end portion) of the underwater metal roof A2 [see FIGS. 7(3), 8(C), (C1)]. Then, the rainwater guide body B1 is installed on the gutter base member 2 [see FIGS. 7(3), 9(D), (D1)]. Specifically, the position near the underwater side end of the gently inclined portion 7k of the guide plate material 7 constituting the rainwater guide body B1 is installed and fixed on the gutter base member 2, and the roof inclined portion 7h of the guide plate material 7 is installed and fixed on the continuous base material 91.

[0085] As described above, the lower side of the rainwater guide body B1 (rainwater guide B) is formed so as to obliquely cross in the width direction of the rainwater guide B, and the inclination angle θ is equivalent to the inclination angle θ of the intermediate gutter 1. Therefore, the upper ends of the guide plate materials 7, 7,... arranged side by side in the width direction (X direction) constituting the rainwater guide plate B1 are horizontal and in a straight line along the roof width direction (X direction), and the lower ends of the guide plate materials 7, 7,... are arranged in a stepped shape.

[0086] Since each of the plurality of guide plate materials 7, 7,... is configured as a set of a plurality (two or more) of guide plate materials 7, 7,..., the positions of the lower ends of the guide plate materials 7, 7,... are shifted up and down between adjacent sets in the roof width direction (X direction), and a stepped end portion 7t is formed by a horizontal side 7m and a vertical side 7n in one set [see FIGS. 5(C) and 9(E)].

[0087] The horizontal side 7m constituting the stepped end portion 7t is a horizontal and straight edge along one set in the roof width direction (X direction), and the vertical side 7n is a vertical and straight edge along the roof inclination direction (Y direction) [see FIG. 5(C)]. And the stepped end portion 7t formed by the set of each of the guide plate materials 7, 7,... constituting the rainwater guide body B1, by connecting the same location of the sets with a straight line, the inclination angle of this straight line becomes θ [see FIG. 9(A)].

[0088] When the lower ends of the plurality of sets of guide plate materials 7 constituting the rainwater guide plate B1 (or rainwater guide B) are configured in a stepped shape as the stepped end portion 7t in an inclined manner, the inclined portion is along the longitudinal direction (X direction) of the upper mounting portion 13 of the intermediate gutter 1 and is placed so as to cover the upper mounting portion 13. That is, the inclination angle θ of the upper mounting portion 13 of the intermediate gutter 1 with respect to the roof width direction (X direction) is equivalent to the inclination angle θ of the lower end of the rainwater guide plate B1.

[0089] Next, it is installed such that the lower end (underwater side end portion) of the upper side metal plate roof A1 overlaps above the upper end portion (above water side end portion) of the rainwater guide body B1 (see FIGS. 7(4), 9(D), and (D1)). Specifically, the guide plate material 7 constituting the rainwater guide body B1 and the gable portion 51 of the upper side roof plate material 5 constituting the upper side metal plate roof A1 are overlapped so that the gable portion 71 overlaps, and the guide plate material 7 and the upper side roof plate material 5 are connected. At this time, at the connection portion, the upper side roof plate material 5 is overlapped so as to be above the guide plate material 7. The overlapping connection portion of the upper side roof plate material 5 and the guide plate material 7 is installed on the continuous base material 91 (see FIG. 7(5)).

[0090] The underwater side end of the upper side metal plate roof A1 and the upper water side end of the underwater side metal plate roof A2 facing in the roof inclination direction (Y direction) are arranged in a direction horizontally crossing in the width direction of the metal plate roof A. And it is configured to cover the upper surface of the gap portion S in the horizontally crossing direction with the rainwater guide B having the same cross-sectional shape as the upper side metal plate roof A1. That is, a gap portion S is formed horizontally along the width direction (X direction) between the lower end (underwater side end portion) of the upper side metal plate roof A1 and the upper end (upper water side end portion) of the already installed underwater side metal plate roof A2 (see FIGS. 1, 7(4), 13(A), and (A1)).

[0091] The gap portion S is a space region formed between the underwater side end of the upper side metal plate roof A1 and the upper water side end of the underwater side metal plate roof A2, and the gap portion S will be covered by the rainwater guide body B1. Next, the intermediate gutter 1 is placed at a position above the underwater side metal plate roof A2 and at the lower end portion (underwater side end portion) of the rainwater guide B and fixed by the gutter fixing material 4 to complete the construction (see FIGS. 7(5), (6), 9(E), and (E1)).

[0092] Summarizing the structure of the above-mentioned flat upper metal plate roof A1, the underwater metal plate roof A2, and the gap S, the underwater end of the upper metal plate roof A1 and the upper end of the underwater metal plate roof A2 facing in the roof inclination direction (Y direction) are placed horizontally in the width direction (X direction) of the metal plate roof A, and are configured to cover the upper surface of the gap S with a rainwater guide B having the same cross-sectional shape as the upper metal plate roof A1. The inclination of the rainwater guide B is formed to be gentler than the inclination angle of the upper metal plate roof A1.

[0093] Next, a second embodiment of the present invention will be described. In the second embodiment, the upper metal plate roof A1 and the rainwater guide B are integrally formed (see FIGS. 11 to 13). The rainwater guide B in this second embodiment has a portion below the upper metal plate roof A1 (underwater side) as the rainwater guide portion B2.

[0094] That is, the upper region of one metal plate roof plate is used as the upper roof plate member 5 of the upper metal plate roof A1, and the lower region is used as the guide plate member 7 of the rainwater guide portion B2. Thus, an integrated roof structure of the upper metal plate roof A1 and the rainwater guide portion B2 is formed. In the second embodiment, due to the integrated structure of the upper metal plate roof A1 and the rainwater guide portion B2, a gap S is assumed to exist between the underwater end of the upper metal plate roof A1 and the upper end of the underwater metal plate roof A2.

[0095] And the gap S in the second embodiment is where the rainwater guide portion B2 is arranged. The underwater portion of the rainwater guide portion B2 in the second embodiment is formed with a gentle slope portion 7k by the gutter base member 2 in the same manner as in the first embodiment. The portion of the rainwater guide portion B2 having an integrated structure with the upper metal plate roof A1 is configured to cover the upper part of the gap S (see FIGS. 12 and 13).

[0096] In the second embodiment as well, there are an embodiment in which a zigzag portion 73 is provided in the rainwater guide portion B2 to form a gentle slope portion 7k (see FIG. 12), and an embodiment in which the gentle slope portion 7k is formed by warping the rainwater guide portion B2 (see FIG. 13). The structure of the zigzag portion 73 is the same as that in the first embodiment. Please refer to the description of the zigzag portion 73 in the first embodiment. Also, the formation of the gentle slope portion 7k due to the warping of the rainwater guide portion B2 is the same as that in the first embodiment. Please refer to the description of the warping in the first embodiment.

[0097] In the second embodiment, it is the same as the first embodiment except that the rainwater guide B is used as the rainwater guide portion B2 and the upper water-side metal plate roof A1 and the rainwater guide portion B2 are integrated. The gutter base member 2, the mountain-shaped reinforcing material 3, etc. are also used in the same manner. Please refer to the description in the first embodiment for the structure. The construction process of the second embodiment described below is also substantially the same as the construction process in the first embodiment.

[0098] FIGS. 11(1) to (5) are process diagrams showing the construction process of the second embodiment of the present invention. For the construction process in this second embodiment, steps (1) and (2) are the same as steps (1) and (2) of the construction process in the first embodiment. For the steps up to here, please refer to the construction process in the first embodiment. FIG. 11(B) shows the completed state of the construction process in the embodiment in which the gentle slope portion 7k is formed by warping the rainwater guide portion B2 in the second embodiment.

[0099] Next, place and fix the gutter base member 2 at the upper end portion (upper water-side end portion) of the lower water-side metal plate roof A2 [see FIG. 11(3)], and then install the integrated upper water-side metal plate roof A1 and the rainwater guide portion B2 [see FIG. 11(3)]. Next, place the intermediate gutter 1 at a position above the lower water-side metal plate roof A2 and at the lower end portion (lower water-side end portion) of the rainwater guide portion B2, and fix it with the gutter fixing material 4 to complete the construction [see FIGS. 11(4) and (5)].

[0100] The continuous base material 91 is a member formed from a thin metal plate material and is elongated along its longitudinal direction (X direction), and is mainly composed of a roof plate receiving portion 91a, a locked portion 91b, and a flat portion 91c. The roof plate receiving portion 91a bulges upward in a substantially trapezoidal portal shape in cross section and serves as a purlin-like part that supports the upper water-side roof plate material 5 and the lower water-side roof plate material 6.

[0101] The flat portion 91c is continuously formed horizontally from one lower end of the roof plate receiving portion 91a, and the locked portion 91b is formed horizontally from the other lower end. The locked portion 91b is locked by a fixture 92 and fixed to the top of the existing roof C. The fixture 92 is attached onto the existing roof C via a hook bolt or the like to a steel material such as a C-shaped steel that supports the slate roof of the existing roof C.

[0102] Next, FIG. 15 is a modified example of the first embodiment of the present invention. In the set of guide plate materials 7 that constitute the rainwater guide body B1, there is also an embodiment in which the lower water-side edge of the guide plate material 7 is formed as an inclined side, and the lower water-side edge of the rainwater guide body B1 is formed as an inclined side having an inclination angle θ as a whole. In this embodiment, the entire lower water-side edge of the rainwater guide plate B1 becomes an inclined side having an inclination angle θ along the roof width direction (X direction). And, the lower water-side end of this rainwater guide plate B1 is placed on the upper water-side attachment portion 13 of the intermediate gutter 1. In this embodiment, the intermediate gutter 1 used is arranged at an inclination angle θ with respect to the lower water-side metal plate roof A2 as described above. Although not particularly shown, this modified example can also be applied to the lower water-side edge of the rainwater guide portion B2 in the second embodiment, whereby the entire lower water-side edge of the rainwater guide portion B2 can be made an inclined side having an inclination angle θ along the roof width direction (X direction).

[0103] It is provided up to the side end of the metal plate roof A of the intermediate gutter 1. In the intermediate gutter 1, along the longitudinal direction (X direction), the terminal at the lower position in the inclined direction protrudes from the end in the width direction (X direction) of the underwater metal plate roof A2 of the metal plate roof A. And a rainwater discharge pipe 14 is provided at the bottom 12 of the portion protruding from the underwater metal plate roof A2 at the terminal of this intermediate gutter 1, and a discharge port 14a of the rainwater discharge pipe 14 is provided at the bottom 12 (see FIGS. 9(F) and (F-1)). Here, the continuous base material 91 will be directly fixed to the structural material such as the main frame of the existing roof C by the fixture 92.

[0104] In the above description, the intermediate gutter 1 is configured to be arranged on the underwater metal plate roof A2 so as to be inclined and straight with an inclination angle θ over the entire roof width direction (X direction) in its longitudinal direction. Therefore, when the length of the underwater metal plate roof A2 in the roof width direction (X direction) is particularly large, although not particularly shown, the intermediate gutter 1 is at the highest position at a substantially central position in the roof width direction (X direction) of the underwater metal plate roof A2, and the terminals on both longitudinal sides from the center in the longitudinal direction of the intermediate gutter 1 are often configured to be in a substantially flat mountain shape or umbrella shape at the lower position. By doing so, particularly even when the length of the underwater metal plate roof A2 in the roof width direction (X direction) is large, the center in the longitudinal direction of the intermediate gutter 1 can be made higher and arranged with a gentle slope so as to descend downward toward both longitudinal sides, so that it can have an inclination angle θ for rainwater to flow, and the rainwater can be discharged from both sides in the roof width direction (X direction) of the underwater metal plate roof A2 from the intermediate gutter 1.

Industrial Applicability

[0105] Although the roof drainage structure in the present invention is premised on being provided on a renovated roof obtained by renovating an existing roof, it is also fully possible to apply the roof drainage structure in the present invention to a newly constructed roof.

Explanation of Reference Numerals

[0106] A... Metal plate roof, A1... Upper water-side metal plate roof, A2... Underwater metal plate roof, B... Rainwater guide, C... Existing roof, S... Gap portion, 1... Intermediate gutter 1, 11... Rainwater receiving rising portion, 11b… rising side part, 12… bottom part, 13… upper water mounting part, 2… gutter base member, 3… mountain-shaped reinforcement, 4… gutter fixing member, 5… upper water roof board material, 6… lower water roof board material, 7… guide board material, 7m… horizontal side, 7n… vertical side, 7t… stepped end part, 7k… gently inclined part, 73… zigzag part.

Claims

1. A metal plate roof comprising an upper water-side metal plate roof in the shape of a waveform and a lower water-side metal plate roof having the same shape as the upper water-side metal plate roof and provided with a gap portion at a predetermined interval in the roof inclination direction, and covered on an existing roof with a roof having a eaves gutter or a valley gutter, the lower water-side end of the upper water-side metal plate roof and the upper water-side end of the lower water-side metal plate roof facing each other in the roof inclination direction are arranged in a direction horizontally crossing in the width direction of the metal plate roof, configured to cover the upper surface of the gap portion in the above-mentioned horizontally crossing direction with a rainwater guide having the same cross-sectional shape as the upper water-side metal plate roof, the inclination degree of the rainwater guide is formed to be less inclined than the inclination angle of the upper water-side metal plate roof, and the lower water-side end of the rainwater guide is formed to obliquely cross in the width direction of the rainwater guide, The intermediate gutter has a cross-sectionally deformed U-shape with a rainwater receiving rising portion, a bottom portion, and an upper water-side mounting portion, and is formed to have the same width in the longitudinal direction. It is placed on the lower water-side metal plate roof below the tip portion of the rainwater guide and along the inclination of the tip of the rainwater guide. The lower end of the intermediate gutter in the inclined direction is provided up to the side end of the metal plate roof, A mountain-shaped reinforcing material facing the roof inclination direction of the lower water-side metal plate roof is fixed to the lower water-side metal plate roof at a predetermined interval in the width direction of the lower water-side metal plate roof. While the lower end side of the rainwater guide is placed on the upper water-side mounting portion of the intermediate gutter, it is fixed to a gutter base member provided in the width direction of the lower water-side metal plate roof fixed to the lower water-side metal plate roof. The gutter base member is also fixed to the mountain-shaped reinforcing material. The lower end of the gutter fixing member that supports the rainwater receiving rising portion of the intermediate gutter from the outside is fixed on the lower water-side metal plate roof and to the mountain-shaped reinforcing material, The rainwater flowing from the rainwater guide into the intermediate gutter is configured to be drained from the terminal of the intermediate gutter. A drainage structure for a roof characterized by this.

2. In the roof drainage structure according to Claim 1, the lower water-side end of the rainwater guide formed to obliquely cross in the width direction of the rainwater guide is formed as a stepped end with a horizontal side and a vertical side so as to match the above-mentioned oblique direction. A drainage structure for a roof characterized by this.

3. In the roof drainage structure described in claim 1 or 2, the rainwater guide consists of a rainwater guide body, and the upper end of the rainwater guide is attached in an overlapping state below the lower end of the water-side metal plate roof.

4. 4. The roof drainage structure according to claim 3, wherein the gentle slope of the rainwater guide body is formed via a zigzag portion formed by recesses and projections.

5. 4. The roof drainage structure according to claim 3, wherein the gently sloping portion of the rainwater guide body is formed by curving the underwater side of the rainwater guide body upward.

6. 3. The roof drainage structure according to claim 1, wherein the water-side metal roof has a structure in which its lower end and the rainwater guide portion which is the rainwater guide are integrated.

7. 7. The roof drainage structure according to claim 6, wherein the gentle slope of the rainwater guide portion is formed via a zigzag portion formed by recesses and projections.

8. 7. The roof drainage structure according to claim 6, wherein the gently sloping portion of the rainwater guide portion is formed by curving the underwater side of the rainwater guide portion upward.

9. A metal roof is covered on an existing roof with a corrugated above-water metal roof and a below-water metal roof with the same shape as the above-water metal roof and gaps at predetermined intervals in the direction of the roof slope, and the roof is equipped with eaves gutters or valley gutters. The underwater end of the above-water side metal sheet roof and the above-water end of the below-water side metal sheet roof that faces in the roof inclination direction are placed horizontally across the width direction of the metal sheet roof, The roof is constructed so that the upper surface of the gap in the horizontal cross-sectional direction is covered by a rainwater guide having the same cross-sectional shape as the above-water side metal sheet roof, and the inclination of the rainwater guide is formed to be gentler than the inclination angle of the above-water side metal sheet roof, The intermediate gutter has a deformed U-shaped cross section with a rising rainwater catcher portion, a bottom portion, and an above-water side mounting portion, and when viewed in a plane relative to the longitudinal direction, the above-water side mounting portion is horizontal and the rising rainwater catcher portion is inclined, the rising rainwater catcher portion of the intermediate gutter is on the underwater side of the roof, and the above-water side mounting portion is placed horizontally in the width direction of the below-water side metal sheet roof, and the lower end of the inclined rising rainwater catcher portion of the intermediate gutter is extended to the side edge of the metal sheet roof, The roof is then secured to the roof by a metal roof support member, which is secured to the roof by a metal roof support member. The metal roof support member is secured to the roof by a metal roof support member. The metal roof support member is secured to the roof by a metal roof support member. The metal roof support member is secured to the roof by a metal roof support member. The lower end of a gutter fixing member that supports the rising portion of the rainwater receiving portion of the intermediate gutter from the outer surface is fixed to the mountain-shaped reinforcing member on the underwater metal sheet roof, A roof drainage structure characterized in that rainwater that flows from the rainwater guide into the intermediate gutter is drained from the end of the intermediate gutter.

10. In the roof drainage structure described in claim 9, the underwater end of the rainwater guide, which is formed so as to cross diagonally across the width direction of the rainwater guide, is formed into a stepped end with horizontal and vertical sides so as to match the aforementioned diagonal direction.

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