Roof drainage structure

Abstract

To provide a roof drainage structure having excellent drainage properties for rainwater and easy construction. [Configuration] The below-water end of the above-water metal sheet roof A1 and the above-water end of the below-water metal sheet roof A2 are arranged horizontally across each other, and the gap S is covered by the rainwater guide B. The intermediate gutter 1 is U-shaped in cross section and formed to have a constant and equal width in the longitudinal direction, the above-water end of the rainwater guide B is horizontally across, and its below-water end is formed to be diagonally across the width direction of the rainwater guide B, and has a stepped end with a horizontal side 7m and a vertical side 7n to match the above-mentioned diagonally across direction, and is placed on the below-water metal sheet roof A2, and the lower end of the intermediate gutter 1 in the inclination direction is extended to the side end of the metal sheet roof A, and the intermediate gutter 1 is fixed to the gutter base member 2 and the angle-shaped reinforcement member 3 arranged in the width direction of the below-water metal sheet roof A2, and rainwater that flows from the rainwater guide B into the intermediate gutter 1 is drained from the end of the intermediate gutter 1.

Description

[Technical field]

[0001] The present invention relates to a roof drainage structure which has excellent drainage properties for rainwater and is easy to install. [Background technology]

[0002] Corrugated slate is often used for the roofs of large buildings (warehouses, factories, etc.). As the slate roofing materials of these slate roofs deteriorate, the roofs must be repaired. In recent years, it has become common for repair work to leave the existing roof as it is and build a new roof on top of the existing roof.

[0003] This means that the existing roof will remain in place, allowing the interior of the building to continue to be used even during renovation work. For example, if the building is a factory, workers can continue to work inside while renovation work is taking place. Similarly, if the building is a warehouse, goods can be stored there while renovation work is taking place. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-209627 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a renovated roof has a large roof area, the area that rainwater hits becomes large. Therefore, when heavy rain falls in a concentrated manner, the amount of water flowing from above the waterline to below the waterline due to the slope of the roof will be large, and the rainwater will exceed the capacity of the eaves gutters, causing them to overflow. This will cause large amounts of water to fall on the walls of the building, and if this continues for a long period of time, it will cause the building to deteriorate.

[0006] In order to prevent such a situation, Patent Document 1 (JP Patent Publication No. 2010-209627) exists. According to Patent Document 1, an auxiliary gutter is provided on the roof, and rainwater can be drained well together with the eaves gutter. However, there are some points that need to be improved in the invention disclosed in Patent Document 1. Therefore, the object of the present invention is to realize a better roof drainage structure for a renovated roof. [Means for solving the problem]

[0007] Therefore, the inventors have conducted intensive research to solve the above-mentioned problems, and as a result, have developed the invention of claim 1, which is a roof provided with eaves gutters or valley gutters, which is covered on an existing roof with a metal sheet roof consisting of a corrugated above-water metal sheet roof and a below-water metal sheet roof having the same shape as the above-water metal sheet roof and a predetermined gap in the roof inclination direction, The underwater end of the above-water side metal sheet roof and the above-water end of the below-water side metal sheet roof facing each other in the roof inclination direction are arranged in a direction horizontally crossing the width direction of the metal sheet roof, and a rainwater guide as a separate member having the same cross-sectional shape as the above-water side metal sheet roof is configured to cover the upper surface of the gap in the horizontal crossing direction. The inclination of the rainwater guide is formed to be gentler than the inclination angle of the above-water side metal sheet roof, and the above-water side end of the rainwater guide is formed to cross horizontally in the width direction, and its below-water side end is formed to cross diagonally in the width direction of the rainwater guide, and is formed as a stepped end with a horizontal side and a vertical side to match the above-mentioned diagonal crossing direction. The intermediate gutter has a deformed U-shaped cross section with the rainwater receiving rising part, the bottom part, and the above-water side mounting part, and is formed to have a constant and equal width in the longitudinal direction. The tip part of the rainwater guide of the intermediate gutter the lower end of the rainwater guide is placed on the underwater metal sheet roof along the slope of the tip of the rainwater guide, the lower end of the intermediate gutter in the direction of the slope of the roof is extended to the side edge of the metal sheet roof, mountain-shaped reinforcement members facing the roof slope direction of the underwater metal sheet roof are fixed to the underside of the underwater metal sheet roof at a predetermined interval in the width direction of the underwater metal sheet roof, the lower end of the rainwater guide is placed on the above-water mounting part of the intermediate gutter and fixed to a gutter base member provided in the width direction of the underwater metal sheet roof fixed to the belowwater metal sheet roof, the gutter base member is also fixed to the mountain-shaped reinforcement member, the lower end of a gutter fixing member supporting the rainwater receiving rising portion of the intermediate gutter from the outer surface is fixed on the belowwater metal sheet roof and to the mountain-shaped reinforcement member, and rainwater flowing from the rainwater guide into the intermediate gutter is drained from the terminal of the intermediate gutter.

[0008] The above problem is solved by the invention of claim 2, which is the roof drainage structure of claim 1, characterized in that the upper end part of the rainwater guide is attached in an overlapping state to the lower side of the lower end part of the above-water side metal sheet roof.The above problem is solved by the invention of claim 3, which is the roof drainage structure of claim 2, characterized in that the gently sloping part of the rainwater guide is formed via a zigzag part made of unevenness.The above problem is solved by the invention of claim 4, which is the roof drainage structure of claim 2, characterized in that the gently sloping part of the rainwater guide is formed by warping the below-water side of the rainwater guide upward. Effect of the Invention

[0009] In the invention of claim 1, the above-water side metal sheet roof is arranged to cover the above-water side part of the rainwater guide which covers the above-water side part of the intermediate gutter, so that rainwater flowing on the above-water side metal sheet roof moves to the rainwater guide without leaking directly to the back side of the above-water side metal sheet roof, and the rainwater guide reliably receives the rainwater flowing down and allows it to flow directly into the intermediate gutter. Furthermore, the below-water side end of the above-water side metal sheet roof is located above the above-water side end of the rainwater guide, so that garbage, dead leaves, etc. flowing down with the rainwater can smoothly move to the rainwater guide and can be prevented from soiling the back side of the above-water side metal sheet roof and the rainwater guide.

[0010] Furthermore, by providing a gap between the underwater end of the above-water side metal sheet roof and the above-water end of the below-water side metal sheet roof, the weight of the metal sheet roof can be reduced to offset the weight of the rainwater guide, and the increase in weight due to the rainwater guide can be suppressed. Furthermore, by providing a gap between the above-water side metal sheet roof and the below-water side metal sheet roof, there is no continuity between the above-water side metal sheet roof and the below-water side metal sheet roof, and construction can be performed from either the above-water side metal sheet roof or the below-water side metal sheet roof.

[0011] 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 arranged horizontally across the width of the metal sheet roof, making it easy to install the above-water side metal sheet roof and the below-water side metal sheet roof. Also, the underwater end of the rainwater guide is formed to cross diagonally across the width of the rainwater guide, and the intermediate gutter has a deformed U-shaped cross section with the rising rainwater receiver part, the bottom part, and the above-water side mounting part, and is formed to have a constant and equal width in the longitudinal direction, which simplifies the shape and structure of the intermediate gutter.

[0012] The intermediate gutter is placed on the below-water-side metal sheet roof below the tip of the rainwater guide (underwater end) and along the slope of the tip (underwater end) of the rainwater guide, so that rainwater flowing down from the rainwater guide can reliably flow into the intermediate gutter, and the intermediate gutter arranged in an inclined state allows rainwater to flow from the upper to the lower end of the slope and be discharged from the widthwise (Y-direction) end of the roof. The cross-sectional shape of the intermediate gutter perpendicular to its longitudinal direction (X-direction) is the same shape and the width is constant at any position, making it extremely easy to install on the below-water-side metal sheet roof.

[0013] Furthermore, in the invention of claim 1, the underwater end of the rainwater guide formed to cross diagonally across the width direction of the rainwater guide is configured to have a stepped end with horizontal and vertical sides to match the above-mentioned diagonal direction, so that the shape of the underwater end of the rainwater guide can be extremely easily formed into a stepped, approximately inclined edge shape. Also, in the invention of claim 1, the abovewater metal sheet roof and the rainwater guide constituting the rainwater guide are different separate members, which has the effect of making construction easy.

[0014] In the invention of claim 2, the upper end of the rainwater guide is attached to the lower side (back side) of the lower end of the above-water side metal sheet roof in an overlapping state, so that rainwater flowing down the above-water side metal sheet roof can flow directly into the rainwater guide without leaking to the existing roof located below the above-water side metal sheet roof. Then, the rainwater flows smoothly from the above-water side metal sheet roof to the rainwater guide and can be sent directly to the intermediate gutter, allowing for extremely efficient drainage of the rainwater.

[0015] In the invention of claim 3, a zigzag portion is formed by unevenness at the point where the slope of the rainwater guide changes, so that the gentle slope area and the roof slope area with different slope angles can be formed very easily in the rainwater guide. In the invention of claim 4, the water side of the rainwater guide is curved upward, so that the gentle slope area can be formed very easily in the rainwater guide. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1A is a vertical sectional side view of a first embodiment of the present invention, and FIG. [Diagram 2] FIG. 1A is an oblique view of the first embodiment of the present invention, FIG. 1B is a schematic cross-sectional view taken along the Y1-Y1 arrow of FIG. 1A, FIG. 1C is an oblique view of roof plate material used for an above-water side metal sheet roof, an below-water side metal sheet roof and a rainwater guide, and FIG. 1D is an oblique view of the main parts showing the structure of the above-water end of the roof plate material used for the below-water side metal sheet roof. [Diagram 3] 1A is an enlarged view of the (α) part in FIG. 1, (B) is an enlarged view of the (γ) part in (A), (C) is an enlarged view of the (δ) part in (A), and (D) is a cross-sectional view taken along the Y2-Y2 arrows in (B). [Figure 4] 1A is an enlarged view of a portion (β) in FIG. 1, (B) is an enlarged view of a portion (ε) in (A), and (C) is a perspective view of a main portion of (B). [Diagram 5] (A) is an oblique view of the zigzag portion of the guide plate material that makes up the rainwater guide, (B) is an enlarged view of the (μ) portion of (A), and (C) is an oblique view showing the connection point between adjacent guide plate materials in the width direction of the roof. [Figure 6]1A is a perspective view showing an embodiment of an intermediate gutter, FIG. 1B is a plan view of the intermediate gutter, and FIG. 1C is an end view taken along the line Y3-Y3 of FIG. [Figure 7] 1(1) to 1(6) are schematic side views showing a construction process of the first embodiment of the present invention. [Figure 8] (A) and (A1) are perspective views of the process and key parts of placing a mountain-shaped reinforcement material on the existing roof in the first step, (B) and (B1) are perspective views of the process and key parts of placing a below-water side metal sheet roof on the existing roof, and (C) and (C1) are perspective views of the process and key parts of installing a gutter base member on the below-water side metal sheet roof. [Figure 9] (D) and (D1) are oblique views of the process of placing and fixing the rainwater guide body to the below-water side metal sheet roof and of the main parts, (E) and (E1) are oblique views of the process of installing the above-water side metal sheet roof to the rainwater guide and of the main parts, and (F) and (F1) are plan views and oblique views of the main parts after construction is completed. [Figure 10] FIG. 1A is a side view of a main portion of a warped type rainwater guide according to a first embodiment of the present invention, FIG. 1B is an enlarged view of a portion (η) in FIG. [Figure 11] FIG. 1A is a schematic side view showing the construction process of the second embodiment of the present invention, and FIG. 1B is a schematic side view showing the completed construction state of the second embodiment in which the rainwater guide is of a warped type. [Figure 12] FIG. 13A is a side view of a main portion of a second embodiment of the present invention, FIG. 13B is an enlarged view of a portion (ζ) of FIG. 13A, and FIG. [Figure 13] 1A is a side view of a main portion of a warped type rainwater guide according to a second embodiment of the present invention, FIG. 1B is an enlarged view of a portion (λ) in FIG. 1A, and FIG. [Figure 14] (A) and (A1) are a plan view and a perspective view of the main part showing the gap portion excluding the rainwater guide, and (B) and (B1) are a plan view and a perspective view of the main part showing the gap portion excluding the rainwater guide while having an intermediate gutter. [Figure 15] 1A and 1B are a plan view and a perspective view of a main part showing a modified example of the first embodiment of the present invention. [Figure 16]13(A) and (B) are a plan view and a perspective view of a main portion of a third embodiment of the present invention, and (C) is a plan view of an intermediate gutter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the roof drainage structure of the present invention will be described with reference to the drawings. The present invention mainly comprises an above-water side metal sheet roof A1, a below-water side metal sheet roof A2, a rainwater guide B, an intermediate gutter 1, a gutter base member 2, a mountain-shaped reinforcement 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-mentioned components, an existing roof C is added as a component. The above-water side metal sheet roof A1 and the below-water side metal sheet roof A2 form the metal sheet roof A as the whole of the building. In the present invention, for convenience of explanation, the X-direction and the Y-direction are used as terms indicating directions.

[0018] The X direction is the width direction of the roof, in other words, the direction perpendicular and horizontal to the direction of water flow from above the water side to below the water side (or from below the water side to above the water side), and is sometimes generally called the girder direction. The Y direction is the slope direction of the roof, in other words, the direction connecting the above the water side and below the water side of the roof, and is perpendicular to the width direction (girder direction) of the roof. In the description of this invention, the X direction and Y direction described for each of the main components all correspond to the X direction and Y direction described in the drawings.

[0019] The above-water side metal sheet roof A1, below-water side metal sheet roof A2, rainwater guide B, intermediate gutter 1, gutter base member 2, angle-shaped reinforcement member 3, and gutter fixing member 4 are all based on the state in which the metal sheet roof A is constructed (see Figures 1(A), 2(A), 3(A), 4(A), etc.), and the X and Y directions are applied in this reference state. The Y and X directions are described in the main drawings. In addition, in the present invention, the metal sheet roof A is equipped with eaves gutters or valley gutters. Since well-known general eaves gutters and valley gutters are used, their explanation will be omitted.

[0020] There are multiple embodiments of the present invention. First, a first embodiment and a second embodiment of the present invention will be outlined, and then the first and second embodiments will be 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 an overlapping state to the lower side of the lower end portion of the above-water side metal sheet roof A1. In the second embodiment, the above-water side metal sheet roof A1 has a structure in which its lower end and the rainwater guide portion B2, which is the rainwater guide B, are integrated.

[0021] Next, the first embodiment of the present invention will be described. First, the above-water side metal sheet roof A1, the below-water side metal sheet roof A2, and the rainwater guide B will be described, followed by the intermediate gutter 1, the gutter base member 2, the angle-shaped reinforcement member 3, and the gutter fixing member 4. The above-water side metal sheet roof A1, the below-water side metal sheet roof A2, and the rainwater guide B are substantially wave-shaped in the width direction (X direction). The above-water side metal sheet roof A1 is composed of a plurality of above-water side roofing plate materials 5, 5, ... (see Fig. 1 (B) and Fig. 2), and the above-water side roofing plate material 5 is formed from a thin metal sheet material (see Fig. 2 (C)).

[0022] Among the multiple above-water side roof plate materials 5, 5, ... that make up the above-water side metal sheet roof A1, an appropriate number of them are connected in the width direction and have their below-water side ends and above-water side ends aligned in the roof slope direction, which is referred to as a set of above-water side roof plate materials 5, 5, ... that make up the above-water side metal sheet roof A1, and the above-water side metal sheet roof A1 is formed by using multiple sets of these.

[0023] For the sake of convenience and understanding, in the present invention, among the multiple above-water side roofing boards 5, 5, ..., two above-water side roofing boards 5, 5 connected in the width direction are considered to be one set. However, the number of above-water side roofing boards 5 included in one set is not limited to two, and it may be composed of three, four, five to ten or more above-water side roofing boards 5. In addition, in the construction of small-scale roof repairs, one set may consist of one above-water side roofing board 5.

[0024] When the above-water side metal roof A1 is installed, the longitudinal direction of each above-water side roofing sheet 5, which is the roof inclination direction when installed, is defined as the Y direction. The width direction perpendicular to the roof inclination direction is defined as the X direction (see Fig. 2(C)). In other words, the longitudinal direction (Y direction), which is the inclination direction of the above-water side metal roof A1, is along the flow direction of the roof (direction from above-water side to below-water side), and in this state it is placed on the existing roof C.

[0025] The above-water side roofing board 5 has a cross section of a generally corrugated shape along the width direction (X direction) of the roof, specifically consisting of a mountain-shaped portion 51 and a bottom surface portion 52, and the mountain-shaped portions 51 and the bottom surface portions 52 alternately and continuously along the width direction (X direction) to form a generally corrugated shape (see Figs. 2(B) and (C)). The mountain-shaped portions 51, 51 at both ends of the width direction (X direction) of the above-water side roofing boards 5, 5 adjacent to each other in the width direction (X direction) overlap with each other, so that the adjacent above-water side roofing boards 5, 5 are connected to each other in the width direction (X direction) (see Fig. 2(B)).

[0026] The cross-sectional shape of the mountain-shaped portion 51 is formed into a substantially trapezoidal shape, and an inclined piece is formed on both sides of the top piece in the width direction. Specifically, four mountain-shaped portions 51, 51, ... are formed on one above-water side roofing sheet material 5 (see FIG. 2(C)). In addition, the bottom surface portion 52 is a flat surface, and the bottom surface portion 52 may be formed with a flat convex portion along the Y direction. As described above, the above-water side metal sheet roof A1 is constructed from a plurality of above-water side roofing sheets 5, 5, .... The below-water side end portion of the above-water side metal sheet roof A1 is placed in a direction horizontally crossing the width direction (X direction) of the metal sheet roof A.

[0027] Therefore, the underwater ends of the above-water side roofing plate materials 5, 5, ... constituting the above-water side metal sheet roof A1 are aligned so as to be horizontal and linear in the width direction (X direction) of the metal sheet roof A. Specifically, when a plurality of sets of above-water side roofing plate materials 5, 5 are arranged in the roof width direction (X direction), the belowwater ends of each set of above-water side roofing plate materials 5 are configured to be horizontal and linear along the width direction (X direction) [see Fig. 9(E), (F), Fig. 14(A), (A-1), (B), (B-1)].

[0028] Next, the underwater side metal roof A2 is composed of multiple underwater side roofing panels 6, 6, ..., and the underwater side roofing panels 6 have the same shape as the abovewater side roofing panels 5, and the cross section in the width direction has the same shape (see Fig. 2(C)). The underwater side roofing panels 6 are formed from a thin metal plate, have a roughly corrugated shape along the roof width direction (X direction), and are composed of a mountain-shaped portion 61 and a bottom surface portion 62, and the mountain-shaped portions 61 and the bottom surface portions 62 are alternately continuous in the width direction (X direction) (see Fig. 2(C)).

[0029] The angled portions 61, 61 at both ends of the width direction (X direction) of the underwater roofing boards 6, 6 adjacent to each other in the width direction (X direction) overlap with each other, connecting the adjacent underwater roofing boards 6, 6 in the width direction (X direction). The angled portion 61 is the same as the angled portion 51 of the abovewater roofing board 5, and has a cross-sectional shape formed into a substantially trapezoidal shape, with inclined pieces formed on both sides of the apex in the width direction. Specifically, the underwater roofing board 6 has four angled portions 61, 61, ... formed in the same way as the abovewater roofing board 5.

[0030] The multiple underwater roofing boards 6 constituting the underwater side metal roof A2 are configured to be connected in the width direction in an appropriate number to form a set. In addition, in accordance with the above-water side metal roof A1, among the multiple underwater roofing boards 6, 6, ... in the underwater side metal roof A2, a set is made up of two underwater roofing boards 6, 6 connected in the width direction. However, the number of underwater roofing boards 6 included in this set is not limited to two, and it may be composed of three, four, five to ten or more underwater roofing boards 6. In addition, in the construction of a small-scale roof renovation, one set may be made up of one underwater roofing board 6.

[0031] As described above, the underwater side metal sheet roof A2 is constructed from a plurality of underwater side roofing boards 6, 6, .... The abovewater side end of the underwater side metal sheet roof A2 is placed horizontally across the width direction (X direction) of the metal sheet roof A. Therefore, the abovewater side end of the underwater side roofing boards 6, 6, ... constituting the underwater side metal sheet roof A2 is aligned so as to be horizontal and linear in the width direction (X direction) of the metal sheet roof A. Specifically, when a plurality of sets of underwater side roofing boards 6, 6, ... are arranged in the roof width direction (X direction), the abovewater side end of each set of underwater side roofing boards 6, 6, ... is configured to be horizontally linear along the width direction (X direction) [see Figures 9 (E), (F), Figures 14 (A), (A-1), (B), (B-1)].

[0032] In other words, the belowwater end of the abovewater side metal sheet roof A1 and the abovewater end of the belowwater side metal sheet roof A2 that faces it in the roof slope direction (Y direction) are both in a straight line and cross horizontally in the width direction (X direction) of the metal sheet roof A, and the belowwater end of the abovewater side metal sheet roof A1 and the abovewater end of the belowwater side metal sheet roof A2 are parallel to each other, forming a gap S (see Figures 1(B), 4(A), and 14).

[0033] Furthermore, at the above-water end of the longitudinal direction (Y direction) of the below-water roofing panel 6, the bottom surface 62 of this end is raised upward, and a rising wall 63 that acts as a dam is formed by bending the mountain-shaped portion 61 against the inclined surface (see Fig. 2(D)). This is to prevent rainwater that has flowed into the bottom surface 62 of the below-water roofing panel 6 from overflowing from the above-water end.

[0034] The multiple above-water side roofing sheets 5, 5, ... constituting the above-water side metal sheet roof A1 and the multiple below-water side roofing sheets 6, 6, ... constituting the below-water side metal sheet roof A2 are installed so as to have the same or approximately the same roof slope in the roof slope direction (Y direction) of the slate roof, which is the existing roof C. Therefore, the inclination angles of the roof slopes of the above-water side metal sheet roof A1 and the below-water side metal sheet roof A2 are the same or approximately the same (see Figure 1).

[0035] Next, the rainwater guide B will be described. The water-surface end of the rainwater guide B is basically horizontal to the roof width direction (X direction), and the water-submerged end of the rainwater guide B is formed so as to cross diagonally across the width direction (X direction) of the rainwater guide B. The lower end of the rainwater guide B is placed on the water-surface mounting part 13 of the intermediate gutter 1. The above-mentioned configuration of "crossing diagonally" refers to a state in which the water-submerged end of the rainwater guide B is lowered from top to bottom along the roof width direction (X direction) from one end side to the other end side [see Fig. 1(B), Fig. 2(A), Fig. 9(D), (E), (F), Fig. 15].

[0036] When the underwater end of the rainwater guide B crosses diagonally, there are two cases: a stepped shape consisting of a collection of multiple steps, and a continuous inclined edge formed by slanting the underwater end of the rainwater guide B. When stepped, the underwater end of the rainwater guide B formed to cross diagonally in the width direction of the rainwater guide B is made into a stepped end 7t by a horizontal edge 7m and a vertical edge 7n so as to match the above-mentioned diagonal direction. The horizontal edge 7m, the vertical edge 7n, and the stepped end 7t will be described later.

[0037] The rainwater guide B is composed of a number of guide plate materials 7, 7, ... (see Fig. 1(B), Fig. 2(A), Fig. 9(D), (E), (F), etc.). The guide plate material 7 has the same shape as the above-water side roof plate material 5 and the below-water side roof plate material 6, and has the same cross-sectional shape in the roof width direction (X direction). In other words, the guide plate material 7 is also formed from a thin metal sheet material, has a substantially corrugated shape along the roof width direction (X direction), and is composed of a mountain-shaped portion 71 and a bottom surface portion 72, and the mountain-shaped portions 71 and the bottom surface portions 72 are alternately continuous in the roof width direction (X direction) (see Fig. 5(A)).

[0038] The mountain-shaped portions 71, 71 at both ends of the width direction (X direction) of the guide plates 7, 7 adjacent to each other in the width direction (X direction) overlap with each other to connect the adjacent guide plates 7, 7. The mountain-shaped portions 71 are the same as the mountain-shaped portions 51 and 61 of the above-water side roof plate material 5 and the below-water side roof plate material 6, and have a cross-sectional shape formed into a substantially trapezoidal shape, with inclined pieces formed on both sides of the apex in the width direction. Specifically, the guide plate material 7 has four mountain-shaped portions 71, 71, ... formed in the same way as the above-water side roof plate material 5 and the below-water side roof plate material 6.

[0039] There are two types of rainwater guide B, one of which is the rainwater guide body B1. The rainwater guide body B1 is an independent structure from the above-water side metal sheet roof A1 and the below-water side metal sheet roof A2. In addition to the rainwater guide body B1, the rainwater guide B also has a rainwater guide part B2. The rainwater guide part B2 will be described later.

[0040] As described above, the rainwater guide B is composed of a plurality of guide plate materials 7, 7, ... connected in the width direction, and therefore the rainwater guide body B1 is also composed of the guide plate material 7. Among the plurality of guide plate materials 7, 7, ... that constitute the rainwater guide body B1 in accordance with the above-water side metal sheet roof A1 and the below-water side metal sheet roof A2, two guide plate materials 7, 7 connected in the width direction are considered to be one set. However, the number of guide plate materials 7 included in this set is not limited to two, and it may be composed of three, four, five to ten or more guide plate materials 7. In addition, in the construction of a small-scale roof renovation, one set may be composed of one guide plate material 7.

[0041] In this way, since the above-water side roof panel material 5 that constitutes the above-water side metal sheet roof A1 and the guide panel material 7 that constitutes the rainwater guide body B1 are separate materials, the above-water side metal sheet roof A1 can be overlapped so that its lower end point (below-water side end point) in the longitudinal direction (Y direction) is positioned above the upper end point (above-water side end point) in the longitudinal direction (Y direction), which is the roof slope direction of the rainwater guide body B1 installed on the existing roof C, and can be attached to the existing roof C in this overlapping state [see Figures 4, 9(E) and (E-1)].

[0042] That is, the mountain-shaped portion 51 and the bottom surface portion 52 of the roof plate material 5 constituting the above-water side metal plate roof A1 and the mountain-shaped portion 71 and the bottom surface portion 72 of the guide plate material 7 constituting the rainwater guide body B1 are overlapped in a substantially tight contact state. The overlapping portion between the lower end portion (below-water side end portion) of the above-water side metal plate roof A1 and the rainwater guide body B1 (above-water side end portion) is aligned so as to be horizontal and linear in the width direction (X direction) of the metal plate roof A. Specifically, when a plurality of sets of guide plate materials 7, 7, ... are arranged in the roof width direction (X direction), the above-water side end portions of each set of guide plate materials 7, 7, ... are configured to be horizontal and linear along the width direction (X direction).

[0043] By overlapping the rainwater guide body B1 so that the lower end (underwater end) in the longitudinal direction (Y direction) of the above-water side metal sheet roof A1 is positioned above the upper end (above-water end) in the longitudinal direction, which is the roof inclination direction (Y direction), the rainwater flowing on the above-water side metal sheet roof A1 is transferred to the rainwater guide body B1 without leaking directly to the back side of the above-water side metal sheet roof A1, and the rainwater guide body B1 can receive the rainwater by flowing down reliably and smoothly from the above-water side metal sheet roof A1 and directly into the intermediate gutter 1. The below-water side end of the above-water side metal sheet roof A1 is located above the above-water side end of the rainwater guide body B1, so that garbage, dead leaves, etc. flowing down together with the rainwater are smoothly transferred to the rainwater guide body B1, and the back side of the above-water side metal sheet roof A1 and the rainwater guide body B1 can be prevented from becoming dirty.

[0044] The multiple guide plate materials 7, 7, ... of the rainwater guide body B1 are formed so that the slope of the underwater portion from the center downward along the longitudinal direction (Y direction) which is the roof slope direction is slightly gentler than the slope of the above-water side metal sheet roof A1. The gentle slope portion of the guide plate material 7 of the rainwater guide B is called the gentle slope portion 7k. The slope angle of the gentle slope portion 7k of the rainwater guide B is smaller and gentler than the slope angles of the roof slopes of the above-water side metal sheet roof A1 and the below-water side metal sheet roof A2 (see Figures 1(A), 3(A), (B), 4, etc.).

[0045] The rainwater guide body B1 has a function of receiving rainwater flowing down from the above-water side metal sheet roof A1 of the metal sheet roof A with the guide plate material 7 constituting the rainwater guide body B1 and directing it into the intermediate gutter 1 described below. Therefore, the gently sloping portion 7k of the guide plate material 7 is sloping downward from the above-water side to the below-water side. The gently sloping portion 7k is formed by forming a zigzag portion 73 having a generally bellows shape with recesses and bulges in the mountain-shaped portion 71 (see FIG. 4).

[0046] The uneven zigzag portion 73 is formed at approximately the middle of the longitudinal direction (Y direction) which is the roof inclination direction of the mountain-shaped portion 71, and specifically, a depression 73a with a flattened V-shape in cross section is formed along the width direction (X direction) at the top of the mountain-shaped portion 71, and a bulge 73b with a triangular convex cross section is formed along the width direction (X direction) on the inclined surfaces on both sides of the width direction of the top. These depressions 73a and bulges 73b are adjacent to each other in the longitudinal direction (Y direction) and form the bellows-shaped zigzag portion 73.

[0047] The gentle slope portion 7k of the rainwater guide body B1 is formed via the zigzag portion 73. Specifically, the mountain-shaped portion 71 of the guide plate material 7 is bent by the zigzag portion 73, and the slope angle changes at the zigzag portion 73, forming the gentle slope portion 7k and the roof slope portion 7h (see FIG. 4(C)). The roof slope portion 7h of the guide plate material 7 is a portion having the same roof slope angle as the above-water side metal sheet roof A1 and the below-water side metal sheet roof A2.

[0048] The multiple zigzag portions 73, 73, ... of the rainwater guide body B1 are aligned so as to be horizontal and linear in the width direction (X direction) of the metal sheet roof A. Specifically, when multiple 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 horizontal and linear along the roof width direction (X direction).

[0049] Therefore, in the rainwater guide body B1, the starting point of the gentle slope portion 7k on the above-water side is a horizontal straight line along the roof width direction (X direction). To show that the starting point of the gentle slope portion 7k on the above-water side is a horizontal straight line along the roof width direction (X direction), a horizontal reference line L is drawn in Fig. 5, and it is shown that the zigzag portions 73, 73, ... are aligned 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.

[0050] Furthermore, as a means for forming the gently sloping portion 7k of the guide plate material 7 constituting the rainwater guide body B1, the gently sloping portion 7k of the rainwater guide body B1 is formed by warping the underwater side of the rainwater guide body B1 upward. Specifically, the underwater side of the guide plate material 7 constituting the rainwater guide body B1 in the longitudinal direction (Y direction) is warped, and this warped portion constitutes the gently sloping portion 7k.

[0051] In this case, the guide plate material 7 constituting the rainwater guide body B1 is formed so that the underwater side is convex downward in an arc shape, that is, an arc-shaped warp is formed along the longitudinal direction (Y direction) (see FIG. 10). The warped portion of the guide plate material 7 is designated as the gentle slope portion 7k. When the gentle slope portion 7k is formed via the warp, there is no clear boundary between the roof slope portion 7h and the gentle slope portion 7k, and the roof slope portion 7h continues to the gentle slope portion 7k via a predetermined change area.

[0052] The gently sloping portion 7k formed as the warped portion is preferably located in the region below the approximate middle point in the longitudinal direction (Y direction), which is the roof inclination direction of the guide plate material 7. The gently sloping portion 7k formed as the arc-shaped warped portion is formed by lifting the vicinity of the below-water end portion of the guide plate material 7 upward by the gutter base member 2 described later (see Figures 11(B), 13(A) and (B)).

[0053] Alternatively, it may be formed by forming a convex arc shape that protrudes downward in an area below the water surface from the midpoint in the longitudinal direction (Y direction) of the guide plate material 7. In an embodiment in which the gently sloping portion 7k is a warped portion, the starting point of the gently sloping portion 7k on the above-water surface is set to be aligned in a horizontal straight line (horizontal reference line L) along the roof width direction (X direction) (see FIG. 13(C)).

[0054] In the rainwater guide body B1, its water-surface end is horizontal and in a straight line with respect to the roof width direction (X direction) of the metal sheet roof A. In other words, the water-surface ends of each set of guide plate materials 7, 7, ... that make up the rainwater guide body B1 are aligned horizontally and in a straight line. The water-underside end of the rainwater guide body B1 is an end that slopes in a stepped shape (see Figs. 2(A), 9(D), (E), (F)) or in an inclined side shape (see Fig. 15). The inclination angle θ of the water-underside end of this rainwater guide body B1 is configured to be equal to the inclination angle θ of the intermediate gutter 1 when it is placed on the water-underside metal sheet roof A2, which will be described later. The configurations of the rainwater guide body B1 and the intermediate gutter 1 will be described later.

[0055] Next, the intermediate gutter 1 will be described. First, the structural relationship between the intermediate gutter 1, the above-water side metal sheet roof A1, the below-water side metal sheet roof A2, and the rainwater guide B will be outlined, and then described in detail. First, the below-water side end of the above-water side metal sheet roof A1 and the above-water side end of the below-water side metal sheet roof A2, which face each other in the roof inclination direction, are placed in a direction horizontally crossing the width direction of the metal sheet roof A. The rainwater guide B, which has the same cross-sectional shape as the above-water side metal sheet roof A1, is configured to cover the upper surface of the gap S in the horizontal cross direction (see Figures 1 and 4(A)). The inclination of the rainwater guide B is formed to be gentler than the inclination angle of the above-water side metal sheet roof A1, and the below-water side end of the rainwater guide B is formed to cross diagonally in the width direction (X direction) of the rainwater guide B (see Figures 1(B), 2(A), 9(D), (E), and (F)).

[0056] The intermediate gutter 1 has a deformed U-shaped cross section with the rainwater receiving rising part 11, the bottom part 12 and the above-water side mounting part 13 (see Figs. 6(A) and (C)), and is formed to have a constant and equal width in the longitudinal direction (see Fig. 6(B)). The intermediate gutter 1 is placed on the underwater side metal sheet roof A2 below the tip of the rainwater guide B and along the slope of the tip of the rainwater guide B, and the lower end of the intermediate gutter 1 in the slope direction is provided up to the side end of the metal sheet roof A (see Fig. 2(A)). The angle-shaped reinforcing members 3 facing the roof slope direction of the underwater side metal sheet roof A2 are fixed to the underside of the underwater side metal sheet roof A2 at a predetermined interval in the width direction of the underwater side metal sheet roof A2 (see Fig. 3).

[0057] The lower end of the rainwater guide B is placed on the above-water mounting part 13 of the intermediate gutter 1 and fixed to a gutter base member 2 provided in the width direction (X direction) of the below-water metal sheet roof A2 fixed to the below-water metal sheet roof A2, and the gutter base member 2 is also fixed to a mountain-shaped reinforcing member 3 (see Figure 3). The lower end of a gutter fixing member 4 that supports the rainwater receiving rising part 11 of the intermediate gutter 1 from the outside is fixed on the below-water metal sheet roof A2 and to the mountain-shaped reinforcing member 3, and rainwater that flows from the rainwater guide B into the intermediate gutter 1 is configured to be drained from the end of the intermediate gutter 1.

[0058] As described above, the intermediate gutter 1 is formed with a deformed U-shaped cross section by the rainwater receiving rising part 11, the bottom part 12, and the above-water side mounting part 13, and is formed to have a constant and equal width in the longitudinal direction (X direction) (see Figs. 6(A), (B), and (C)). Therefore, the rainwater receiving rising part 11 and the above-water side mounting part 13 are linear and parallel (including approximately parallel). The longitudinal direction of the rainwater guide B is approximately along the X direction. The rainwater receiving rising part 11 is a rising part located on the below-water side in a direction perpendicular to the longitudinal direction. The bottom part 12 is set to have an inclination angle equal to the below-water side metal sheet roof A2, and the rainwater receiving rising part 11 is set to be approximately vertical when the intermediate gutter 1 is placed on the below-water side metal sheet roof A2 (see Fig. 6(B)).

[0059] The above-water mounting part 13 is configured to be located above the water in a direction perpendicular to the longitudinal direction of the intermediate gutter 1. The above-water mounting part 13 has a steeply inclined surface 13a that is steeper than the bottom part 12, a substantially vertical wall surface 13b is formed above the upper end of the steeply inclined surface 13a, and a substantially horizontal mounting top surface 13c is formed from the upper end of the vertical wall surface 13b. The mounting top surface 13c is the part that is fixed to the gutter base member 2 described later (see FIG. 3(B)).

[0060] The intermediate gutter 1 is formed as a single piece, and its length is determined according to the width direction (X direction) of the renovated roof. Alternatively, the intermediate gutter 1 can be separated into multiple pieces along the longitudinal direction (X direction), and the separated pieces can be connected to be used at the desired length. The intermediate gutter 1 placed on the underwater side metal sheet roof A2 is placed in a direction diagonally across the width direction of the underwater side metal sheet roof A2 with the rainwater receiving rising part 11 on the roof underwater side [see Figures 1(B), 2(A), 9(E), (F), 14(B), and (1 of B)].

[0061] In other words, the longitudinal direction (X direction) of the intermediate gutter 1 placed on the underwater metal sheet roof A2 has an inclination angle θ with respect to the width direction (X direction) of the underwater metal sheet roof A2. The inclination angle θ of this intermediate gutter 1 is equal to the inclination angle diagonally across the width direction (X direction) of the underwater side of the rainwater guide B, i.e., the rainwater guide body B1 described above. The inclination of the underwater end of the rainwater guide plate B1 and the inclination angle 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 in which the inclination angle θ is shown.

[0062] Specifically, the intermediate gutter 1 is placed on the below-water side metal sheet roof A2 in a gentle inclination so as to descend from the top (above-water side) to the bottom (below-water side) in the roof inclination direction (Y direction) along the roof width direction (X direction) of the below-water side metal sheet roof A2. The inclination angle θ of the intermediate gutter 1 placed on the below-water side metal sheet roof A2 with respect to the width direction (X direction) of the below-water side metal sheet roof A2 may be an extremely small angle as long as rainwater can flow down.

[0063] Specifically, the inclination angle θ may be about 0.5 degrees or a value around that. Therefore, the inclination angle θ is close to horizontal, and when the intermediate gutter 1 placed on the underwater metal sheet roof A2 is viewed from the outside, it may appear to be approximately 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 sheet roof A2 is shown with the value of the inclination angle θ increased by about 2 to 3 times for ease of understanding.

[0064] The gutter base member 2 is long in the longitudinal direction (X direction), and the longitudinal direction (X direction) is installed along the width direction (X direction) of the underwater side metal sheet roof A2 (see Figs. 1(A), 3(A), (B), 8(C), (C-1)). The length of the gutter base member 2 in the longitudinal direction (X direction) is approximately equal to the length of the width direction (X direction) of the set of underwater side roof panels 6, 6 that constitute the underwater side metal sheet roof A2 (see Figs. 8(C), (C-1)). In this case, two underwater side roof panels 6, 6 are used as a set, so the length of the gutter base member 2 in the longitudinal direction (X direction) is approximately equal to the width direction of the underwater side roof panels 6, 6 connected in the width direction.

[0065] The gutter base member 2 has a base portion 21 having a substantially trapezoidal cross section formed in the center in a cross section perpendicular to the longitudinal direction (X direction), i.e., in a Y direction cross section, and mounting pieces 22, 22 are formed on both sides in the width direction perpendicular to the longitudinal direction of the base portion 21. The mounting pieces 22, 22 of the gutter base member 2 are installed on the angled portion 61 of the underwater side roof panel material 6 constituting the underwater side metal sheet roof A2, and the gutter base member 2 is fixed to the underwater side metal sheet roof A2 with fasteners such as screws. The longitudinal direction (X direction) of the gutter base member 2 is installed perpendicular to the longitudinal direction (Y direction) of the angled portion 61 of the underwater side roof panel material 6 (see Fig. 8(C) and (C-1)).

[0066] Here, a mountain-shaped reinforcing material 3 is housed on the inner surface (inner side) of the mountain-shaped portion 61 of the below-water side roof panel material 6 on which the gutter base member 2 is installed, and the mounting pieces 22, 22 of the gutter base member 2 are fixed to the mountain-shaped reinforcing material 3 via the mountain-shaped portion 61 with fasteners such as screws (see Fig. 3(D)). In other words, the gutter base member 2 is firmly supported by the mountain-shaped reinforcing material 3 as well as the mountain-shaped portion 61 of the below-water side roof panel material 6 (see Fig. 3). Also, although not specifically shown, the mountain-shaped reinforcing material 3 may be placed and fixed on the outer surface (upper side) of the mountain-shaped portion 61 of the below-water side roof panel material 6.

[0067] As described above, the gutter base member 2 has a length in the longitudinal direction (X direction) that is approximately equal to the length in the width direction (X direction) of a set of underwater roof panels 6, 6 connected in the width direction of the underwater metal sheet roof A2. A plurality of gutter base members 2 are fixed to the upper end portion (underwater end portion) of the underwater metal sheet roof A2 (see Fig. 8(C) and (C-1)). 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 abovewater 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 are fixed with fasteners such as screws (see Fig. 3(B)).

[0068] The mountain-shaped reinforcement material 3 is long in the longitudinal direction (Y direction), which is the roof inclination direction, and is fixed onto the through-base material 91 described later. The length of the mountain-shaped reinforcement material 3 in the longitudinal direction (Y direction) is a length that spans the range from the installation position of the gutter base member 2 to the installation position in the flow direction (Y direction) of the gutter fixing material 4 described later (see Fig. 3(A)). The cross-sectional shape of the mountain-shaped reinforcement material 3 perpendicular to the longitudinal direction (Y direction) is approximately hat-shaped, with a reinforcing protrusion 31 and mounting pieces 32, 32 formed on both sides of the reinforcing protrusion 31 in the width direction (X direction), and the mounting pieces 32, 32 are fixed to the through-base material 91 with fasteners such as screws (see Fig. 3(D)).

[0069] Then, the underwater side metal sheet roof A2 is installed on the existing roof C via the underwater side metal sheet roof A2 and the base material 91 so that the angled portion 61 of the underwater side roof sheet material 6 constituting the underwater side metal sheet roof A2 is placed over the reinforcing protrusion 31 of the angled reinforcing material 3. In other words, the angled reinforcing material 3 reinforces the underwater side metal sheet roof A2 at the position where the intermediate gutter 1, gutter base member 2, and gutter fixing member 4 are arranged from the underside of the angled portion 61 of the underwater side metal sheet roof A2, firmly fixes the support member 41 of the gutter base member 2 and the gutter fixing member 4 onto the angled portion 61, and also serves to stably install the intermediate gutter 1 on the underwater side metal sheet roof A2 (see FIG. 3).

[0070] The gutter fixing member 4 serves to fix the intermediate gutter 1 placed on the below-water metal sheet roof A2 to the lower metal sheet roof A2 (see Fig. 1(A) and Figs. 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 sheet. The support member 41 is composed of an attachment base 41a, a rising portion 41b, and a locking portion 41c, and the attachment base 41a and the rising portion 41b form a substantially L-shape (or an inverted L-shape).

[0071] The mounting base 41a is disposed on the angled portion 61 of the underwater roof panel 6 constituting the underwater metal roof A2, and is fixed to the underwater metal roof A2 with fasteners such as screws, thereby fixing the support member 41 to the underwater metal roof A2 (see Figs. 3(A) and (C)). The rising portion 41b serves to support the rainwater receiving rising portion 11 of the intermediate gutter 1 placed on the underwater metal roof A2, from the underwater side. 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) and (C)).

[0072] The tensioning member 42 is made of metal and has a strip shape. The tensioning member 42 is disposed between the locking portion 41c of the support member 41 and the underwater end of the rainwater guide body B1 (see Figs. 3(A), (B), and (C)). One end (underwater end) of the tensioning member 42 in the longitudinal direction (Y direction) is fixed to the locking portion 41c of the support member 41 with a fastener such as a screw, and the other end (abovewater end) is fixed to the underwater end of the rainwater guide body B1 with a fastener such as a screw.

[0073] In this way, the support members 41 prevent the intermediate gutter 1 from collapsing due to the pressure of rainwater acting on the rainwater-receiving rising portion 11, and firmly fix the intermediate gutter 1 to the below-water side metal sheet roof A2. A plurality of support members 41 are provided and attached at approximately equal intervals along the longitudinal direction (X direction) of the intermediate gutter 1 placed on the below-water side metal sheet roof A2 (see Figs. 2(A) and 9(F)).

[0074] Next, the construction process of the first embodiment of the present invention will be described. Fig. 7 shows the construction process of the first embodiment, divided into stages (1) to (6) as viewed from the side only in the Y direction connecting the above-water side and the below-water side. Fig. 8 and Fig. 9 show the construction process in eight stages (A) to (F) as viewed in a plan view.

[0075] First, on an existing roof C made of sine-curve wavy slates or the like, through-base materials 91 are installed in parallel at a specified interval along the width direction (X direction) (see Fig. 8(A)). Next, angle-shaped reinforcement materials 3 are fixed to adjacent through-base materials 91, 91 with fasteners such as screws so that their longitudinal direction (Y direction) is aligned with the flow direction (Y direction) of the existing roof C (see Figs. 7(1), 8(A), and (A-1)).

[0076] Next, the underwater side roofing plate material 6 constituting the underwater side metal sheet roof A2 is installed and fixed to the base material 91 (see Fig. 7(2), Fig. 8(B), (B-1)). At this time, the angled portion 61 of the underwater side roofing plate material 6 is installed so as to cover the angled reinforcing material 3. In this manner, the underwater side metal sheet roof A2 is constructed from a plurality of underwater side roofing plate materials 6, 6, .... As described above, on the abovewater side of the underwater side metal sheet roof A2, the underwater side roofing plate materials 6, 6, ... are installed so as to be aligned horizontally and in a straight line in the width direction (X direction) of the metal sheet roof A.

[0077] Next, the gutter base member 2 is installed and fixed to the upper end portion (above-water end portion) of the below-water side metal sheet roof A2 (see Fig. 7(3), Fig. 8(C), (C-1)). Next, the rainwater guide body B1 is installed on the gutter base member 2 (see Fig. 7(3), Fig. 9(D), (D-1)). Specifically, the gently sloping portion 7k of the guide plate material 7 constituting the rainwater guide body B1 is installed and fixed at a position near the below-water side end portion on the gutter base member 2, and the roof sloping portion 7h of the guide plate material 7 is installed and fixed on the through base material 91.

[0078] As described above, the underwater side of the rainwater guide body B1 (rainwater guide B) is formed so as to cross diagonally in the width direction of the rainwater guide B, and the inclination angle θ is equal to the inclination angle θ of the intermediate gutter 1. Therefore, the abovewater ends of the guide plate materials 7, 7, ... arranged in parallel 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 belowwater ends of the guide plate materials 7, 7, ... are arranged so as to form a staircase shape.

[0079] Each of the multiple guide plate materials 7, 7, ... is configured as a set of multiple (two or more) guide plate materials 7, 7, .... Therefore, between adjacent sets in the roof width direction (X direction), the positions of the underwater ends of the guide plate materials 7, 7, ... are shifted up and down, and each set forms a stepped end 7t with a horizontal edge 7m and a vertical edge 7n (see Figures 5C and 9(E)).

[0080] The horizontal sides 7m constituting the stepped end 7t are a set of horizontal and straight edges along the roof width direction (X direction), and the vertical sides 7n are a set of vertical and straight edges along the roof inclination direction (Y direction) (see Fig. 5(C)). The stepped end 7t, which is formed by an assembly of each set of guide plate materials 7, 7, ... constituting the rainwater guide body B1, connects the same points of the sets with straight lines, and the inclination angle of this straight line is θ (see Fig. 9(A)).

[0081] When the underwater ends of the multiple sets of guide plate materials 7 that make up the rainwater guide plate B1 (or rainwater guide B) are configured to be inclined as stepped stepped ends 7t, the inclined portions are placed along the longitudinal direction (X direction) of the abovewater mounting part 13 of the intermediate gutter 1 and to cover the abovewater mounting part 13. In other words, the inclination angle θ of the abovewater mounting part 13 of the intermediate gutter 1 with respect to the roof width direction (X direction) is equal to the inclination angle θ of the belowwater end of the rainwater guide plate B1.

[0082] Next, the lower end (underwater end) of the above-water side metal roof A1 is installed so as to overlap the upper end (above-water end) of the rainwater guide body B1 (see Fig. 7(4), Fig. 9(D), (D-1)). Specifically, the above-water side roofing plate material 5 constituting the above-water side metal roof A1 and the guide plate material 7 constituting the rainwater guide body B1 are connected to the above-water side roofing plate material 5 so that the mountain-shaped portion 51 and mountain-shaped portion 71 of the guide plate material 7 overlap. At this time, the above-water side roofing plate material 5 is overlapped above the guide plate material 7 at the connection point. The overlap connection point between the above-water side roofing plate material 5 and the guide plate material 7 is installed on the through-base material 91 (see Fig. 7(5)).

[0083] The underwater end of the above-water side metal sheet roof A1 and the above-water end of the below-water side metal sheet roof A2, which faces the above-water side metal sheet roof A2 in the roof inclination direction (Y direction), are arranged horizontally across the width direction of the above-water side metal sheet roof A. The above-water side metal sheet roof A1 has a rainwater guide B with the same cross-sectional shape as the above-water side metal sheet roof A1, and the rainwater guide B is configured to cover the upper surface of the above-mentioned horizontally across gap S. In other words, a gap S is formed horizontally along the width direction (X direction) between the lower end (underwater end) of the above-water side metal sheet roof A1 and the upper end (above-water end) of the below-water side metal sheet roof A2, which has already been installed [see Fig. 1, Fig. 7(4), Fig. 13(A), (A-1)].

[0084] The gap S is a spatial region formed between the below-water end of the above-water side metal sheet roof A1 and the above-water end of the below-water side metal sheet roof A2, and the gap S is to be covered by the rainwater guide body B1. Next, the intermediate gutter 1 is placed above the below-water side metal sheet roof A2 at a position that will be the lower end (below-water end) of the rainwater guide B and fixed with the gutter fixing material 4, completing the construction [see Figures 7 (5), (6), Figure 9 (E), (1) of E)].

[0085] To summarize the configuration of the above-water side metal sheet roof A1, the below-water side metal sheet roof A2, and the gap S described above, the below-water side end of the above-water side metal sheet roof A1 and the above-water side end of the below-water side metal sheet roof A2 which faces it in the roof inclination direction (Y direction) are placed horizontally across the width direction (X direction) of the metal sheet roof A, and are configured to cover the upper surface of the gap S with a rainwater guide B which has the same cross-sectional shape as the above-water side metal sheet roof A1, and the inclination of the rainwater guide B is formed so as to be gentler than the inclination angle of the above-water side metal sheet roof A1.

[0086] Next, a second embodiment of the present invention will be described. In the second embodiment, the above-water side metal sheet roof A1 and the rainwater guide B are integrally constructed (see Figs. 11 to 13). In the rainwater guide B in the second embodiment, the lower side (underwater side) of the above-water side metal sheet roof A1 is made into a rainwater guide section B2.

[0087] In other words, the above-water side area of ​​one metal sheet roof panel is used as the above-water side roof panel material 5 of the above-water side metal sheet roof A1, and the below-water side area is used as the guide panel material 7 of the rainwater guide portion B2. This results in a single roof structure in which the above-water side metal sheet roof A1 and the rainwater guide portion B2 are integrated. In the second embodiment, due to the structure in which the above-water side metal sheet roof A1 and the rainwater guide portion B2 are integrated, a gap portion S exists between the below-water side end of the above-water side metal sheet roof A1 portion and the above-water side end of the below-water side metal sheet roof A2.

[0088] In the second embodiment, the rainwater guide portion B2 is disposed in the gap S. In the second embodiment, the below-water portion of the rainwater guide portion B2 has a gentle slope portion 7k formed by the gutter base member 2, as in the first embodiment. The portion of the rainwater guide portion B2, which is integrated with the above-water metal sheet roof A1, is configured to cover the upper part of the gap S (see Figs. 12 and 13).

[0089] The second embodiment also includes an embodiment in which a zigzag portion 73 is provided in the rainwater guide portion B2 to form the gently sloping portion 7k (see FIG. 12), and an embodiment in which the gently sloping portion 7k is formed by warping the rainwater guide portion B2 (see FIG. 13). The structure of the zigzag portion 73 is similar to that of the first embodiment, so please refer to the description of the zigzag portion 73 in the first embodiment. Furthermore, the formation of the gently sloping portion 7k by warping the rainwater guide portion B2 is also similar to that of the first embodiment, so please refer to the description of the warp in the first embodiment.

[0090] In the second embodiment, the rainwater guide B is a rainwater guide portion B2, and the above-water side metal sheet roof A1 and the rainwater guide portion B2 are integrated into one structure. Other than that, the second embodiment is the same as the first embodiment, and the gutter base member 2, the angle-shaped reinforcing member 3, etc. are also used in the same way. Please refer to the explanation in the first embodiment for the structure. The construction process of the second embodiment described below is also approximately the same as the construction process in the first embodiment.

[0091] Figures 11(1)-(5) are process diagrams showing the construction process of the second embodiment of the present invention. In the construction process of this second embodiment, steps (1) and (2) are similar to steps (1) and (2) of the construction process of the first embodiment, so please refer to the construction process of the first embodiment for the steps up to this point. Figure 11(B) shows the completion 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.

[0092] Next, the gutter base member 2 is placed and fixed to the upper end (above-water end) of the below-water side metal sheet roof A2 (see Fig. 11(3)), and then the integrated above-water side metal sheet roof A1 and rainwater guide part B2 are installed (see Fig. 11(3)). Next, the intermediate gutter 1 is placed above the below-water side metal sheet roof A2 and at the position that will be the lower end (below-water end) of the rainwater guide part B2 and fixed with the gutter fixing material 4, completing the construction (see Figs. 11(4) and (5)).

[0093] The through base material 91 is made of a thin metal plate material, is a long member 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 is formed to bulge upward with a cross section of a roughly trapezoidal gate shape, and is a portion that acts like a purlin supporting the above-water side roof plate material 5 and the below-water side roof plate material 6.

[0094] A flat portion 91c is formed horizontally from the lower end of one side of the roof panel receiving portion 91a, and an engaged portion 91b is formed horizontally from the lower end of the other side. The engaged portion 91b is engaged by a fixing device 92 and fixed to the top of the existing roof C. The fixing device 92 is attached to 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.

[0095] Next, FIG. 15 shows a modified example of the first embodiment of the present invention. In the set of guide plate materials 7 constituting the rainwater guide body B1, the underwater edge of the guide plate material 7 is formed to be an inclined side, and the underwater 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 underwater edge of the rainwater guide plate B1 is an inclined side having an inclination angle θ along the roof width direction (X direction). And, the underwater end of this rainwater guide plate B1 is placed on the abovewater mounting part 13 of the intermediate gutter 1. In this embodiment, the intermediate gutter 1 used is disposed on the underwater metal sheet roof A2 at an inclination angle θ as described above. Although not particularly shown, this modified example can also be applied to the underwater edge of the rainwater guide part B2 in the second embodiment, and thereby the entire underwater edge of the rainwater guide part B2 can be an inclined side having an inclination angle θ along the roof width direction (X direction).

[0096] The intermediate gutter 1 is provided up to the side end of the metal sheet roof A, and the lower end in the inclination direction of the intermediate gutter 1 protrudes along the longitudinal direction (X direction) from the end of the underwater metal sheet roof A2 of the metal sheet roof A in the width direction (X direction). A rainwater drain pipe 14 is provided at the bottom 12 of the end of the intermediate gutter 1 protruding from the underwater metal sheet roof A2, and an outlet 14a of the rainwater drain pipe 14 is provided at the bottom 12 (see Fig. 9F, (F-1)). Here, the through base material 91 is directly fixed to the structural material of the existing roof C, such as the purlin, by the fixing device 92.

[0097] In the above description, the intermediate gutter 1 is arranged on the underwater side metal sheet roof A2 so that it is inclined and linear with an inclination angle θ over the entire roof width direction (X direction) in its longitudinal direction. Therefore, when the length of the underwater side metal sheet roof A2 in the roof width direction (X direction) is particularly long, although not shown, the intermediate gutter 1 is often arranged so that it is highest at the approximate center of the underwater side metal sheet roof A2 in the roof width direction (X direction) and the ends on both sides in the longitudinal direction of the intermediate gutter 1 are lower than the longitudinal center, forming an approximately flat mountain shape or umbrella shape. By doing so, even when the length of the underwater side metal sheet roof A2 in the roof width direction (X direction) is particularly long, the intermediate gutter 1 can be arranged so that the longitudinal center of the intermediate gutter 1 is higher and the intermediate gutter 1 is gently inclined downward toward both sides in the longitudinal direction to have an inclination angle θ at which rainwater flows, and the intermediate gutter 1 can be arranged to discharge rainwater from both sides in the roof width direction (X direction) of the underwater side metal sheet roof A2. [Industrial Applicability]

[0098] The roof drainage structure of the present invention is premised on being installed on a repaired roof that has been repaired from an existing roof, but it is also entirely possible to apply the roof drainage structure of the present invention to a newly constructed roof. [Explanation of symbols]

[0099] A...Metal sheet roof, A1...Above water side metal sheet roof, A2...Below water side metal sheet roof, B...Rainwater guide, C: Existing roof, S: Gap, 1: Intermediate gutter, 11: Rainwater receiving riser, 12: Bottom, 13... Above-water mounting portion, 2... Gutter base member, 3... Mountain-shaped reinforcement member, 4... Gutter fixing member, 5...above-water roof board, 6...below-water roof board, 7...guide board, 7m...horizontal edge, 7n...vertical edge, 7t...stepped end, 7k...gently sloping portion, 73...zigzag portion.

Claims

1. A metal roof is covered on an existing roof with a corrugated above-water metal sheet roof and a below-water metal sheet roof having the same shape as the above-water metal sheet roof and a predetermined gap in the roof inclination direction, and the roof is provided 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 opposed in the roof inclination direction are arranged horizontally across the width direction of the metal sheet roof, A rainwater guide, which is a separate member having the same cross-sectional shape as the above-water side metal sheet roof, is configured to cover the upper surface of the gap in the horizontally crossing direction described above, and the inclination of the rainwater guide is formed to be gentler than the inclination angle of the above-water side metal sheet roof, and the above-water side end of the rainwater guide is formed to cross horizontally in the width direction, and its below-water side end is formed to cross diagonally in the width direction of the rainwater guide, and has a stepped end with a horizontal side and a vertical side to match the above-mentioned diagonally crossing direction, The intermediate gutter has a deformed U-shape in cross section with the rainwater receiving rising portion, the bottom portion and the above-water side mounting portion, and is formed so as to have a constant and equal width in the longitudinal direction. The intermediate gutter is placed on the below-water side metal sheet roof below the tip of the rainwater guide and along the slope of the tip of the rainwater guide, and the lower end of the intermediate gutter in the slope direction is provided up to the side edge of the metal sheet roof. a gutter base member provided in the width direction of the underwater metal sheet roof and fixed to the underwater metal sheet roof, the lower end of the rainwater guide is placed on the abovewater mounting portion of the intermediate gutter and fixed to a gutter base member provided in the width direction of the underwater metal sheet roof fixed to the underwater metal sheet roof, the gutter base member is also fixed to the angle-shaped reinforcement member, and the lower end of a gutter fixing member supporting the rainwater receiving rising portion of the intermediate gutter from the outer surface is fixed to the underwater metal sheet roof and on the belowwater metal sheet roof, A roof drainage structure characterized in that rainwater flowing from the rainwater guide into the intermediate gutter is drained from an end of the intermediate gutter.

2. 2. The roof drainage structure according to claim 1, wherein the upper end of the rainwater guide is attached to the lower side of the lower end of the above-water side metal sheet roof in an overlapping state.

3. 3. The roof drainage structure according to claim 2, wherein the gentle slope of the rainwater guide is formed via a zigzag portion formed by projections and recesses.

4. 3. The roof drainage structure according to claim 2, wherein the gently sloping portion of the rainwater guide is formed by curving the underwater side of the rainwater guide upward.

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