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, with the upstream side end and downstream side end of the rainwater guide B formed to cross horizontally in a width direction. An intermediate gutter 1 has a deformed U-shaped cross section, its upstream side is formed in a direction crossing horizontally, and only its downstream side is formed along an inclination and is placed 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 16

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 slates of the slate roof material of this slate roof deteriorate, the roof must be repaired. In recent years, in such repair work, the existing roof is left as it is, and a new roof is often constructed on top of this 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, even while the repair work is being carried out, workers can continue to work indoors. Similarly, if the building is a warehouse, goods 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 water side to the lower water side due to the roof gradient also becomes large, and in the eaves gutter, the rainwater overflows from the eaves gutter exceeding the allowable capacity of the rainfall amount. As a result, a large amount of moisture is deposited on the wall surface of the building, etc. 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 roof drainage structure in a renovated roof that is even better.

Means for Solving the Problems

[0007] Therefore, as a result of intensive research to solve the above problems, the inventor has found that the invention of Claim 1 is a metal plate roof composed of a corrugated 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 portion at a predetermined interval in the roof inclination direction, which is covered on an existing roof, and in a roof provided with an eaves gutter or a valley gutter, The underwater-side end of the upper-metal-plate roof and the water-on-side end of the underwater-metal-plate roof facing each other in the roof inclination direction are placed horizontally in a direction crossing the width direction of the metal-plate roof, and are configured to cover the upper surface of the gap portion in the horizontally crossing direction with a rainwater guide as a separate member having the same cross-sectional shape as the upper-metal-plate roof. The inclination of the rainwater guide is formed to be gentler than the inclination angle of the upper-metal-plate roof. The water-on-side end and the underwater-side end of the rainwater guide are respectively formed to be parallel to 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 a water-on-side mounting portion. When viewed in a plane with respect to the longitudinal direction, the water-on-side mounting portion is horizontal, and the rainwater receiving rising portion is inclined. The rainwater receiving rising portion of the intermediate gutter is the underwater side of the roof, and the water-on-side mounting portion is horizontally placed in the width direction of the underwater-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-plate roof. A mountain-shaped reinforcing member facing the roof inclination direction of the underwater-metal-plate roof is fixed to the lower surface of the underwater-metal-plate roof at a predetermined interval in the width direction of the underwater-metal-plate roof. The lower end closer to the lower end of the rainwater guide is placed on the water-on-side mounting portion of the intermediate gutter and fixed to a gutter base member provided in the width direction of the underwater-metal-plate roof fixed to the underwater-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 underwater-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] In the invention of claim 2, in the roof drainage structure according to claim 1, 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. In the invention of claim 3, in the roof drainage structure according to claim 2, the gentle slope portion of the rainwater guide is formed through a zigzag portion formed by irregularities, thereby solving the above problems. In the invention of claim 4, in the roof drainage structure according to claim 2, the gentle slope portion of the rainwater guide is formed by curving the lower side of the rainwater guide upward, thereby solving the above problems.

Effect of the Invention

[0009] In the invention of claim 1, due to the configuration in which the upper portion of the rainwater guide covering the upper portion of the intermediate gutter is arranged to be covered by the upper metal plate roof, the rainwater flowing on the upper metal plate roof can move to the rainwater guide without leaking to the back surface of the upper metal plate roof as it is, and the rainwater guide can reliably receive the flowing-down rainwater and flow the rainwater directly into the intermediate gutter. Further, the lower end portion of the underwater side of the upper metal plate roof is located above the upper end portion of the rainwater guide on the water side, and dust, withered leaves, etc. flowing down together with the rainwater can smoothly move to the rainwater guide, preventing them from soiling the back surface sides of the upper metal plate roof and the rainwater guide.

[0010] Furthermore, by providing a gap between the lower end portion of the underwater side of the upper metal plate roof and the upper end portion of the underwater side of the lower metal plate roof, the weight of the metal plate roof can be reduced, which can offset the weight of the rainwater guide, and the increase in weight due to the rainwater guide can be suppressed. Further, due to the existence of a gap between the upper metal plate roof and the lower metal plate roof, there is no continuity between the upper metal plate roof and the lower metal plate roof, and construction can be carried out from either the upper metal plate roof or the lower metal plate roof.

[0011] The underwater end of the upper metal plate roof and the upper end of the underwater 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 metal plate roof and the underwater metal plate roof can be made easier. In particular, the upper metal plate roof, the underwater metal plate roof, the underwater end and the upper end of the rainwater guide can all be made horizontal along the roof width direction (X direction). Also, with the intermediate gutter configured such that only the rainwater receiving rising part is inclined, the entire intermediate gutter can be installed in a substantially horizontal state, resulting in a neat appearance and easy construction.

[0012] Further, in the invention of claim 1, while the rainwater receiving rising part of the intermediate gutter is the underwater side of the roof and the upper mounting part is horizontally placed in the width direction of the underwater metal plate roof, and the lower end of the rainwater receiving rising part of the intermediate gutter in the inclination direction is provided up to the side end of the metal plate roof. Therefore, only the rainwater receiving rising part of the intermediate gutter is formed in the inclination direction, and the underwater end of the upper metal plate roof as another member, the upper end of the underwater metal plate roof, and the water side end of the rainwater guide are all formed in a direction horizontally crossing in the width direction, enabling efficient cutting processing of the workability and members.

[0013] And the intermediate gutter is placed on the underwater metal plate roof below the tip of the rainwater guide (underwater end) and along the inclination of the tip (underwater end) of the rainwater guide, so that rainwater flowing down from the rainwater guide can surely flow into the intermediate gutter. The inclined intermediate gutter allows rainwater to flow from above the inclination to below the inclination and drain from the end in the roof width direction (Y direction). Also, in the invention of claim 1, since the upper metal plate roof and the rainwater guide constituting the rainwater guide are different separate members, it has the effect of being easy to construct.

[0014] In the invention of claim 2, since the upper end portion of the rainwater guide cannot be attached in a superposed state below (the back side) the lower end portion of the upper metal plate roof, rainwater flowing down the upper metal plate roof can flow directly into the rainwater guide without leaking to the existing roof side located below the upper metal plate roof. Then, the rainwater can flow well from the upper metal plate roof of the rainwater to the rainwater guide and be sent directly into the intermediate gutter, enabling extremely good drainage of the rainwater.

[0015] In the invention of claim 3, by forming a zigzag portion due to unevenness at the location where the inclination of the rainwater guide changes, it is possible to extremely easily form a gently inclined portion region and a roof inclined portion region with different inclination angles in the rainwater guide. In the invention of claim 4, by curving the lower water side of the rainwater guide upward, it is possible to extremely easily form a gently inclined portion region in the rainwater guide body.

Brief Description of the Drawings

[0016]

Figure 1

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Figure 12

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Figure 15

Figure 16

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the drainage structure of the roof in the present invention will be described with reference to the drawings. The present invention mainly includes an upper water-side metal roof A1, a lower water-side metal 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)]. Further, the present invention is premised on a renovated roof. Therefore, in addition to the above components, an existing roof C is added as a component. And the upper water-side metal roof A1 and the lower water-side metal roof A2 form a metal roof A as a whole of the building. In the present invention, for the sake of convenience of explanation, the X direction and the Y direction are used as the words indicating directions.

[0018] 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 water side to the lower water side (or from the lower water side to the upper water side), and is sometimes generally called the purlin direction. The Y direction is the inclination direction of the roof. In other words, it is the direction connecting the upper water side and the lower water side of the roof, and is a direction orthogonal to the width direction (purlin 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 shown in the drawings.

[0019] The above-mentioned upper water-side metal roof A1, lower water-side metal roof A2, rainwater guide B, intermediate gutter 1, gutter base member 2, gable-shaped reinforcing member 3, and gutter fixing member 4 are all based on the state in which the metal roof A is formed [see Fig. 1(A), Fig. 2(A), Fig. 3(A), Fig. 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 shown in the main drawings. In the present invention, the metal roof A is provided with eaves gutters or valley gutters. Since generally known ones are used for the eaves gutters and valley gutters, the description thereof is omitted.

[0020] The present invention has a plurality of embodiments. First, the first and second embodiments 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 a superposed state below the lower end portion of the upper metal plate roof A1. Further, in the second embodiment, the upper 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.

[0021] Next, the first embodiment of the present invention will be described. First, the upper metal plate roof A1, the lower metal plate roof A2, and the rainwater guide B will be described, and then the intermediate gutter 1, the gutter base member 2, the gable-shaped reinforcing member 3, and the gutter fixing member 4 will be described. The upper metal plate roof A1, the lower metal plate roof A2, and the rainwater guide B are substantially corrugated in the width direction (X direction). The upper metal plate roof A1 is composed of a plurality of upper roof plate members 5, 5,... [see FIGS. 1(B) and 2], and the upper roof plate member 5 is formed from a thin metal material [see FIG. 2(C)].

[0022] Among the plurality of upper roof plate members 5, 5,... constituting the upper metal plate roof A1, those that are connected in the width direction in an appropriate number and have the lower ends and upper ends in the roof inclination direction aligned are a set of upper roof plate members 5, 5,... constituting the upper metal plate roof A1, and there are a plurality of such sets to constitute the upper metal plate roof A1.

[0023] For the sake of convenience of explanation of the present invention, in order to make it easier to understand, among the plurality of upper roof plate members 5, 5,..., a set is composed of two upper roof plate members 5, 5 connected in the width direction. However, the number of upper roof plate members 5 included in this set is not limited to two, and it may be composed of 3, 4, 5 to 10 or more upper roof plate members 5. Also, in the construction of a small-scale renovated roof, one set may be composed of one upper roof plate member 5.

[0024] With the upper - water - side metal - plate roof A1 constructed, in each upper - water - side roof plate member 5, in the longitudinal direction, the installed roof - inclination direction is taken as the Y - direction. Also, the width - direction orthogonal to the roof - inclination direction is taken as 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 roof - runoff direction (the direction from the upper - water - side to the lower - water - side), and in this state, it is arranged on the existing roof C.

[0025] The upper - water - side roof plate member 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 Fig. 2(B), (C)]. And the peak portions 51, 51 at both ends in the width - direction (X - direction) of the adjacent upper - water - side roof plate members 5, 5 are overlapped, and the adjacent upper - water - side roof plate members 5, 5 are connected in the width - direction (X - direction) [see Fig. 2(B)].

[0026] 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 in one upper - water - side roof plate member 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 - plate roof A1 is constructed from a plurality of upper - water - side roof plate members 5, 5,.... The lower - water - side end of the upper - water - side metal - plate roof A1 is placed in a direction horizontally crossing the width - direction (X - direction) of the metal - plate roof A.

[0027] Therefore, the lower - water - side ends of the upper - water - side roof plate members 5, 5,... constituting the upper - water - side metal - plate roof A1 are 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 upper - water - side roof plate members 5, 5 are arranged in the roof - width direction (X - direction), the lower - water - side ends of the upper - water - side roof plate members 5 in each set are configured to be in a horizontal straight - line shape along the width - direction (X - direction) [see Fig. 9(E), (F), Fig. 14(A), (A1), (B), (B1)].

[0028] Next, the underwater metal plate roof A2 is composed of a plurality of underwater roof plates 6, 6, …, and the underwater roof plates 6 have the same shape as the above-mentioned upper water roof plates 5 and the same cross-sectional shape in the width direction (see Fig. 2(C)). The underwater roof plates 6 are formed from thin metal materials, are substantially corrugated along the roof width direction (X direction), and consist of a peak portion 61 and a bottom portion 62, with the peak portion 61 and the bottom portion 62 continuously alternating in the width direction (X direction) (see Fig. 2(C)).

[0029] Then, the peak portions 61, 61 at both ends in the width direction (X direction) of adjacent underwater roof plates 6, 6 in the width direction (X direction) are overlapped, and the adjacent underwater roof plates 6, 6 are connected in the width direction (X direction). The peak portion 61 is equivalent to the peak 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 peak portions 61, 61, … are formed on the underwater roof plate 6.

[0030] The plurality of underwater roof plates 6 constituting the underwater metal plate roof A2 are configured such that those connected in the width direction in an appropriate number form a set. Then, in accordance with the upper water metal plate roof A1, among the plurality of underwater roof plates 6, 6, … in the underwater metal plate 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.

[0031] As described above, the underwater metal plate roof A2 is constructed from a plurality of underwater roof plate members 6, 6, …. The upper water-side end of the underwater metal plate roof A2 is placed in a direction horizontally crossing the width direction (X direction) of the metal plate roof A. Therefore, the upper water-side ends of the underwater roof plate members 6, 6, … that make up the underwater metal plate roof A2 are 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 the underwater roof plate members 6, 6, … are arranged in the roof width direction (X direction), the upper water-side ends of each set of the underwater roof plate members 6, 6, … are configured to be horizontal and in a straight line along the width direction (X direction) [see FIGS. 9(E), (F), 14(A), (A-1), (B), (B-1)].

[0032] That is, the lower water-side end of the upper metal plate roof A1 and the upper water-side 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 the width direction (X direction) of the metal plate roof A. The lower water-side end of the upper metal plate roof A1 and the upper water-side end of the underwater metal plate roof A2 are parallel to each other, and a gap portion S is formed [see FIGS. 1(B), 4(A), 14].

[0033] Furthermore, at the upper water-side end in the longitudinal direction (Y direction) which is the inclination direction of the underwater roof plate member 6, the bottom surface 62 of this end portion may be raised upward, and a rising wall portion 63 that serves as a weir is formed by bending with respect to the inclined surface at 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 member 6 from overflowing from the upper water-side end.

[0034] The plurality of upper roof plate members 5, 5, … that make up the upper metal plate roof A1 and the plurality of underwater roof plate members 6, 6, … that make up 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).

[0035] 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 lower end of the rainwater guide B underwater is formed so as to obliquely cross 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 configuration of "obliquely crossing" described above means that the lower end of the rainwater guide B underwater 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), 15].

[0036] And, when the lower end of the rainwater guide B underwater obliquely crosses, there are cases where it is in a stepped shape formed by a plurality of stepped portions gathering together, and cases where the lower end of the rainwater guide B underwater is formed in an inclined shape to form a continuous inclined side. In the case of the stepped shape, the lower end of the rainwater guide B underwater formed so as to obliquely cross the width direction of the rainwater guide B is a stepped end portion 7t formed 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.

[0037] The rainwater guide B is composed of a plurality of guide plates 7, 7,... [see FIGS. 1(B), 2(A), 9(D), (E), (F), etc.]. The guide plate 7 has the same shape as the upper roof plate 5 and the lower roof plate 6 underwater, and the cross section in the roof width direction (X direction) is the same cross-sectional shape. That is, the guide plate 7 is also formed of a thin sheet metal material, is substantially corrugated along the roof width direction (X direction), is composed of a peak portion 71 and a bottom portion 72, and the peak portion 71 and the bottom portion 72 are continuously alternating in the roof width direction (X direction) [see FIG. 5(A)].

[0038] Then, the chevron portions 71, 71 at both ends in the width direction (X direction) of the adjacent guide plate materials 7, 7 are overlapped with each other, and the adjacent guide plate materials 7, 7 are connected to each other. The chevron portion 71 is equivalent to the chevron portions 51 and 61 of the upper water-side roof plate material 5 and the lower water-side roof plate material 6, and its 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-side roof plate material 5 and the lower water-side roof plate material 6, the guide plate material 7 is formed with four chevron portions 71, 71, ….

[0039] There are two types of rainwater guides B, one of which 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.

[0040] As described above, the rainwater guide B is composed of a plurality of guide plate materials 7, 7, … connected in the width direction. Therefore, the rainwater guide body B1 is also composed of the guide plate material 7 in the same way. And in accordance with the upper water-side metal plate roof A1 and the lower water-side metal plate roof A2, in the plurality of guide plate materials 7, 7, … that make up the rainwater guide body B1, two of the guide plate materials 7, 7 connected in the width direction are taken as a set. However, the number of guide plate materials 7 included in this set is not limited to two, and it may also be composed of three, four, five, up to ten or more guide plate materials 7. Also, in the construction of a small-scale renovated roof, one guide plate material 7 may be taken as a set.

[0041] Thus, since the upper water-side roof board material 5 that constitutes the upper water-side metal plate roof A1 and the guide board material 7 that constitutes the rainwater guide body B1 are separate materials, 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 positioned above 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, and they can be overlapped and configured to be attached to the existing roof C in this overlapped state [see FIGS. 4, 9(E), and (E-1)].

[0042] That is, the ridge portion 51 and the bottom surface portion 52 of the roof board material 5 that constitutes the upper water-side metal plate roof A1 and the ridge portion 71 and the bottom surface portion 72 of the guide board material 7 that constitutes the rainwater guide body B1 are overlapped in a substantially close contact state. And the overlapping 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 board materials 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 board materials 7, 7,... are configured to be horizontal and in a straight line along the width direction (X direction).

[0043] And by overlapping the lower end portion (lower water-side end portion) in the longitudinal direction (Y direction) of the upper water-side metal plate roof A1 above 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, the rainwater flowing on the upper water-side metal plate roof A1 can move to the rainwater guide body B1 without leaking out to the back surface of the upper water-side metal plate roof A1 as it is, and the rainwater guide body B1 can receive the rainwater and flow down smoothly and surely from the upper water-side metal plate roof A1 and discharge the rainwater to the intermediate gutter 1 as it is. And the lower water-side end of the upper water-side metal plate roof A1 is located above the upper water-side end of the rainwater guide body B1, and it is also possible to prevent dust, dead leaves, etc. flowing down together with the rainwater from smoothly moving to the rainwater guide body B1 and soiling the back surface sides of the upper water-side metal plate roof A1 and the rainwater guide body B1.

[0044] A plurality of guide plate members 7, 7,... of the rainwater guide body B1 are formed such that the inclination of the lower part on the water side from the center along the longitudinal direction (Y direction) which is the roof inclination direction is slightly gentler than the inclination of the upper metal plate roof A1. The gently inclined portion of the guide plate member 7 of the rainwater guide B is referred to as the gently inclined portion 7k. The inclination angle of the gently inclined 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.).

[0045] The rainwater guide body B1 serves to receive rainwater flowing down from the upper metal plate roof A1 of the metal plate roof A with the guide plate members 7 constituting the rainwater guide body B1 and flow it into the intermediate gutter 1 described later. Therefore, the gently inclined portion 7k of the guide plate member 7 is inclined so as to descend downward from the upper side to the lower side. The gently inclined 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).

[0046] The zigzag portion 73 formed by the unevenness is formed at a substantially intermediate position in the longitudinal direction (Y direction) which is the roof inclination direction of the mountain-shaped 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 mountain-shaped 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 at the top. These recessed portion 73a and bulging portion 73b are adjacent and continuous in the longitudinal direction (Y direction) and constitute the bellows-shaped zigzag portion 73.

[0047] And the gently inclined 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 member 7 is bent by the zigzag portion 73, and the inclination angle changes with the zigzag portion 73 as a boundary, so that the gently inclined portion 7k portion and the roof inclined portion 7h portion can be formed (see FIG. 4(C)). The roof inclined portion 7h of the guide plate member 7 is a portion having the same roof inclination angle as the upper metal plate roof A1 and the lower metal plate roof A2.

[0048] 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 in a horizontal straight line along the roof width direction (X direction).

[0049] Therefore, in the rainwater guide body B1, the formation starting point on the water upper side of the gentle slope portion 7k is a horizontal straight line along the roof width direction (X direction). In order to show that the formation starting point on the water upper side of the gentle slope portion 7k is a horizontal 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.

[0050] Furthermore, as a means for forming the gentle slope portion 7k of the guide plate material 7 constituting the rainwater guide body B1, the gentle slope 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 in the longitudinal direction (Y direction) of the guide plate material 7 constituting the rainwater guide body B1 is warped, and this warped portion constitutes the gentle slope portion 7k.

[0051] This is to make the guide plate material 7 constituting the rainwater guide body B1 have a convex arc shape with the underwater side downward, 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 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 and the gentle slope portion 7k are continuous from the roof slope portion 7h to the gentle slope portion 7k through a predetermined change region.

[0052] And it is preferable that the gently inclined portion 7k, which is the warped portion, is set in a region on the lower side from a substantially middle position in the longitudinal direction (Y direction), which is the roof inclination direction of the guide plate material 7. The gently inclined portion 7k, which is an arcuate warped portion, is formed by the gutter base member 2 described later lifting the vicinity of the lower end portion under water of the guide plate material 7 upward (see FIGS. 11(B), 13(A), and (B)).

[0053] Alternatively, it may be formed by providing a convex arc-shaped bend protruding downward in a region below the middle position in the longitudinal direction (Y direction) of the guide plate material 7. In the embodiment in which the gently inclined portion 7k is a warped portion, the formation starting point on the upper side of the water of the gently inclined portion 7k is set so as to be aligned along a horizontal straight line (horizontal reference line L) in the roof width direction (X direction) (see FIG. 13(C)).

[0054] In the rainwater guide body B1, its upper end on the water is horizontal and linear with respect to the roof width direction (X direction) of the metal plate roof A. That is, the upper ends on the water of each set of guide plate materials 7, 7,... constituting the rainwater guide body B1 are aligned horizontally and linearly. The lower end on the water of the rainwater guide body B1 is an end portion inclined in a stepped shape (see FIGS. 2(A), 9(D), (E), and (F)) or an inclined side shape (see FIG. 15). The inclination angle θ of the lower side end of the rainwater guide body B1 is configured to be equal to the inclination angle θ in a state where it is placed on the lower 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.

[0055] Next, the intermediate gutter 1 will be described. First, the compositional relationship between the intermediate gutter 1, the upper water-side metal plate roof A1, the lower water-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 water-side metal plate roof A1 and the upper water-side end of the lower water-side metal plate roof A2 facing each other in the roof inclination direction are placed horizontally across in the width direction of the metal plate roof A. A rainwater guide B having the same cross-sectional shape as the upper water-side metal plate roof A1 is configured to cover the upper surface of the gap portion S in the horizontally crossing direction described above (see FIGS. 1 and 4(A)). The inclination of the rainwater guide B is formed to be gentler than the inclination angle of the upper water-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 [see FIGS. 1(B), 2(A), 9(D), (E), (F)].

[0056] The intermediate gutter 1 has a cross-sectionally deformed U shape formed by a rainwater receiving rising portion 11, a bottom portion 12, and an upper water-side mounting portion 13 (see FIGS. 6(A) and (C)), and is formed to have an equal width with a constant width in the longitudinal direction (see FIG. 6(B)). Then, it is placed on the lower water-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 (see FIG. 2(A)). Gable-shaped reinforcing members 3 facing the roof inclination direction of the lower water-side metal plate roof A2 are fixed to the lower water-side metal plate roof A2 at predetermined intervals in the width direction of the lower water-side metal plate roof A2 (see FIG. 3).

[0057] The lower end side of the rainwater guide B is placed on the upper water-side mounting portion 13 of the intermediate gutter 1 and fixed to a 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 gable-shaped reinforcing member 3 (see FIG. 3). The lower end of a gutter fixing member 4 that supports the rainwater receiving rising portion 11 of the intermediate gutter 1 from the outside is fixed on the lower water-side metal plate roof A2 and to the gable-shaped reinforcing member 3. The rainwater flowing from the rainwater guide B into the intermediate gutter 1 is configured to be drained from the terminal of the intermediate gutter 1.

[0058] As described above, the middle gutter 1 is formed in a cross-sectionally deformed U-shape by a rainwater receiving rising portion 11, a bottom portion 12, and an upper-water mounting portion 13, and is formed to have a constant width in the longitudinal direction (X direction) and to have the same width [see FIGS. 6(A), (B), and (C)]. Therefore, the rainwater receiving rising portion 11 and the upper-water mounting portion 13 are linear and parallel (including substantially parallel). The longitudinal direction in 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 roof A2, and is set such that the rainwater receiving rising portion 11 becomes substantially vertical in a state where the middle gutter 1 is placed on the lower-water side metal roof A2 [see FIG. 6(B)].

[0059] The upper-water 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 mounting portion 13 is formed with a steep inclined surface 13a that is steeper than the bottom portion 12, a substantially vertical wall surface 13b is formed above the upper end of the steep inclined surface 13a, and a substantially horizontal mounting top surface 13c is formed above the upper end of the vertical wall surface 13b. The mounting top surface 13c is a portion fixed to a gutter base member 2 described later [see FIG. 3(B)].

[0060] The middle 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 middle gutter 1 may be separated into a plurality of pieces along the longitudinal direction (X direction), and these separated pieces may be connected and used as a desired length. The middle gutter 1 placed on the lower-water side metal roof A2 is placed in a direction that obliquely crosses the width direction of the lower-water side metal roof A2 with the rainwater receiving rising portion 11 as the lower-water side of the roof [see FIGS. 1(B), 2(A), 9(E), (F), 14(B), (B-1)].

[0061] 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 in 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 drawing where the inclination angle θ is shown.

[0062] 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) in 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.

[0063] 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 nearly 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 drawing, for the sake of clarity, the numerical value of the inclination angle θ of the intermediate gutter 1 placed on the underwater metal plate roof A2 is increased by about 2 to 3 times and shown.

[0064] 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)). Also, the length of the longitudinal direction (X direction) of the gutter base member 2 is substantially equal to the length of the width direction (X direction) of a set of underwater roof plates 6, 6 that constitute the underwater metal plate roof A2 (see FIGS. 8(C), (C1)). Here, since two underwater roof plates 6, 6 are taken as a set, the length of the longitudinal direction (X direction) of the gutter base member 2 is substantially equal to the width direction of the underwater roof plates 6, 6 connected in the width direction.

[0065] The gutter base member 2 has a base portion 21 with a substantially trapezoidal cross-section formed at the center in a cross-section orthogonal to the longitudinal direction (X direction), that is, a Y-direction cross-section, 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 material 6 that constitutes the underwater metal roof A2, and the gutter base member 2 is fixed to the underwater metal roof A2 with a fixing tool such as a screw. Also, 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 material 6 [see FIGS. 8(C) and (C1)].

[0066] Here, a mountain-shaped reinforcing member 3 is housed inside (inner side) the ridge portion 61 of the underwater roof plate material 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 via the ridge portion 61 [see FIG. 3(D)]. That is, the gutter base member 2 is firmly supported by the mountain-shaped reinforcing member 3 together with the ridge portion 61 of the underwater roof plate material 6 (see FIG. 3). Also, 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 material 6.

[0067] 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 set of underwater roof plate materials 6, 6 connected in the width direction of the underwater metal roof A2. And a plurality of gutter base members 2 are fixed to the upper end portion (underwater end portion) of the underwater metal 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 attachment top surface 13c of the upper-water attachment 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)].

[0068] The gable-shaped reinforcing member 3 is long in the longitudinal direction (Y direction) which is the roof inclination direction, and is fixed onto a continuous base material 91 described later. The length of the gable-shaped reinforcing member 3 in the longitudinal direction (Y direction) is the length of the range extending from the installation position of the gutter base member 2 to the installation location in the flow direction (Y direction) of the gutter fixing member 4 described later (see Fig. 3(A)). The cross-sectional shape orthogonal to the longitudinal direction (Y direction) of the gable-shaped reinforcing member 3 is a substantially hat shape, with reinforcing convex portions 31 and attachment pieces 32, 32 formed on both sides in the width direction (X direction) of the reinforcing convex portions 31, and the attachment pieces 32, 32 are fixed to the continuous base material 91 with fixing tools such as screws (see Fig. 3(D)).

[0069] Then, the gable-shaped portion 61 of the underwater roof plate material 6 constituting the underwater metal plate roof A2 is covered on the reinforcing convex portion 31 of the gable-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, it serves to reinforce from the lower surface side of the gable-shaped portion 61 of the underwater metal plate roof A2 with the gable-shaped reinforcing member 3, firmly fix the support members 41 of the gutter base member 2 and the gutter fixing member 4 on the gable-shaped portion 61, and install the intermediate gutter 1 on the underwater metal plate roof A2 in a stable state (see Fig. 3).

[0070] 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 Fig. 1(A), 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 plate. The support member 41 consists of an attachment base portion 41a, a rising portion 41b, and a locking portion 41c, and forms a substantially L shape (or inverted L shape) by the attachment base portion 41a and the rising portion 41b.

[0071] The mounting base 41a is arranged on the ridge portion 61 of the underwater roof plate material 6 that constitutes 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) 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 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) and (C)).

[0072] 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), and (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 side end) is fixed to the underwater end portion of the rainwater guide body B1 by fixing with a screw or the like.

[0073] In this way, the support member 41 prevents the intermediate gutter 1 from falling due to the pressure of rainwater acting on the rainwater receiving rising portion 11, 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) and 9(F)).

[0074] Next, the process of constructing 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 upper water side and the underwater side. FIGS. 8 and 9 show the construction process in eight steps (A) to (F) as seen in plan view.

[0075] First, in an existing roof C such as a corrugated slate of a sign curve, a continuous base material 91 is installed at predetermined intervals along the width direction (X direction) in parallel [see Fig. 8(A)]. Next, a mountain-shaped reinforcing material 3 is fixed to 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), and (A1)].

[0076] Next, an underwater roof plate material 6 that constitutes the underwater metal roof A2 is installed and fixed to the continuous base material 91 [see Figs. 7(2), 8(B), and (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,.... On the upper water side of the underwater metal roof A2, as described above, the underwater roof plate materials 6, 6,... are installed so as to be horizontal and in a straight line in the width direction (X direction) of the metal roof A.

[0077] Next, a gutter base member 2 is installed and fixed at the upper end portion (upper water side end portion) of the underwater metal roof A2 [see Figs. 7(3), 8(C), and (C1)]. Then, a rainwater guide body B1 is installed on the gutter base member 2 [see Figs. 7(3), 9(D), and (D1)]. Specifically, the position near the underwater side end of the gently inclined portion 7k of the guide plate material 7 that constitutes 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.

[0078] The underwater 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 as described above, and its inclination angle θ is the same as the inclination angle θ of the intermediate gutter 1. Therefore, the upper water side ends of the guide plate materials 7, 7,... arranged in parallel in the width direction (X direction) that constitute the rainwater guide plate B1 are horizontal and in a straight line along the roof width direction (X direction), and the underwater side ends of the guide plate materials 7, 7,... are arranged in a stepped shape.

[0079] Since the plurality of guide plate members 7, 7,... are each configured as a set of a plurality (two or more) of guide plate members 7, 7,..., the positions of the lower ends of the guide plate members 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)].

[0080] 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 members 7, 7,... constituting the rainwater guide body B1, by connecting the same positions of the sets with a straight line, the inclination angle of this straight line becomes θ [see FIG. 9(A)].

[0081] When the lower ends of a plurality of sets of guide plate members 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 placed along the longitudinal direction (X direction) of the upper mounting portion 13 of the intermediate gutter 1 and covers 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.

[0082] Next, it is installed so that the lower end (lower side end portion) of the upper metal plate roof A1 overlaps above the upper end portion (upper side end portion) of the rainwater guide body B1 [see FIGS. 7(4), 9(D), and (D1)]. Specifically, the guide plate member 7 and the upper roof plate member 5 are connected such that the gable portion 51 of the upper roof plate member 5 constituting the upper metal plate roof A1 and the gable portion 71 of the guide plate member 7 constituting the rainwater guide body B1 overlap. At this time, at the connection portion, the upper roof plate member 5 is overlapped so as to be above the guide plate member 7. The overlapping connection portion of the upper roof plate member 5 and the guide plate member 7 is installed on the continuous base material 91 [see FIG. 7(5)].

[0083] The underwater-side end of the upper water-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 a rainwater guide B having the same cross-sectional shape as the upper water-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 water-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), (A-1)].

[0084] The gap portion S is a space region formed between the underwater-side end of the upper water-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 with a rainwater guide body B1. Next, an 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 a gutter fixing member 4 to complete the construction [see FIGS. 7(5), (6), 9(E), (E-1)].

[0085] Summarizing the configurations of the upper water-side metal plate roof A1, the underwater-side metal plate roof A2, and the gap portion S described above, the underwater-side end of the upper water-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 placed in a direction horizontally crossing in the width direction (X direction) of the metal plate roof A, and are configured to cover the upper surface of the gap portion S with a rainwater guide B having the same cross-sectional shape as the upper water-side metal plate roof A1, and the inclination degree of the rainwater guide B is formed to be gentler than the inclination angle of the upper water-side metal plate roof A1.

[0086] Next, a second embodiment of the present invention will be described. In the second embodiment, the upper water-side metal plate roof A1 and the rainwater guide B are integrally configured (see FIGS. 11 to 13). The rainwater guide B in this second embodiment uses the lower-side (underwater-side) portion of the upper water-side metal plate roof A1 as a rainwater guide portion B2.

[0087] That is to say, the upper water area of one metal plate roofing panel is used as the upper roof plate material 5 of the upper water metal plate roof A1, and the lower water area is used as the guide plate material 7 of the rainwater guide part B2. As a result, the upper water metal plate roof A1 and the rainwater guide part B2 are integrated into one roof structure. In the second embodiment, due to the integrated structure of the upper water metal plate roof A1 and the rainwater guide part B2, a gap S is assumed to exist between the lower water end part of the upper water metal plate roof A1 and the upper water end part of the lower water metal plate roof A2.

[0088] And the gap S in the second embodiment is where the rainwater guide part B2 is arranged. The lower water part of the rainwater guide part B2 in the second embodiment will form a gently inclined part 7k by means of the gutter base member 2 in the same way as in the first embodiment. The part of the rainwater guide part B2 with the integrated structure on the upper water metal plate roof A1 is configured to cover the upper part of the gap S location (see FIGS. 12 and 13).

[0089] Also in the second embodiment, there are an embodiment in which a zigzag part 73 is provided in the rainwater guide part B2 to form a gently inclined part 7k (see FIG. 12), and an embodiment in which the gently inclined part 7k is formed by bending the rainwater guide part B2 (see FIG. 13). The structure of the zigzag part 73 is the same as that in the first embodiment. Please refer to the description of the zigzag part 73 in the first embodiment. Also, the formation of the gently inclined part 7k due to the warp of the rainwater guide part B2 is the same as that in the first embodiment. Please refer to the description of the warp in the first embodiment.

[0090] In the second embodiment, except that the rainwater guide B is used as the rainwater guide part B2 and the upper water metal plate roof A1 and the rainwater guide part B2 are integrated, it is the same as the first embodiment. The gutter base member 2, the gable-shaped reinforcing material 3, etc. are also used in the same way. 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.

[0091] 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) of the process are the same as steps (1) and (2) of the construction process of the first embodiment. For the steps up to here, refer to the construction process of the first embodiment. Fig. 11(B) shows the completed state of the construction process in the embodiment where 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 on the upper end portion (upper water-side end portion) of the underwater metal plate roof A2 (see Fig. 11(3)). Then, the integrated upper water-side metal plate roof A1 and the rainwater guide portion B2 are installed (see Fig. 11(3)). Next, the intermediate gutter 1 is placed at a position above the underwater metal plate roof A2 and at the lower end portion (underwater-side end portion) of the rainwater guide portion B2 and fixed by the gutter fixing material 4 to complete the construction (see Figs. 11(4) and (5)).

[0093] The continuous base material 91 is formed from a thin metal plate material and is a member that is long along its longitudinal direction (X direction). It 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 gate 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.

[0094] 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 the 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.

[0095] Next, FIG. 15 shows a modification of the first embodiment of the present invention. In the set of guide plate members 7 constituting the rainwater guide body B1, there is also an embodiment in which the lower edge of the guide plate member 7 under water is formed as an inclined side, and the lower edge of the rainwater guide body B1 under water is formed as an inclined side having an inclined angle θ as a whole. In this embodiment, the entire lower edge of the rainwater guide plate B1 under water becomes an inclined side having an inclined angle θ along the roof width direction (X direction). And the lower end of this rainwater guide plate B1 under water is placed on the upper mounting portion 13 of the intermediate gutter 1. In this embodiment, the intermediate gutter 1 used is arranged at an inclined angle θ with respect to the lower metal plate roof A2 under water as described above. Although not particularly shown, this modification can also be applied to the lower edge of the rainwater guide portion B2 in the second embodiment, whereby the entire lower edge of the rainwater guide portion B2 under water can be made an inclined side having an inclined angle θ along the roof width direction (X direction).

[0096] 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 lower metal plate roof A2 of the metal plate roof A under water. And a rainwater discharge pipe 14 is provided at the bottom 12 of the portion protruding from the lower 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. 9F), (F1)). Here, the continuous base material 91 will be directly fixed to the structural material such as the main house of the existing roof C by the fixture 92.

[0097] In the above description, the intermediate gutter 1 is arranged on the lower-metal-plate roof A2 in an inclined and straight shape with an inclination angle θ over the entire roof width direction (X direction) in its longitudinal direction. Therefore, when the length of the lower-metal-plate roof A2 in the roof width direction (X direction) is particularly large, although not particularly shown in the drawings, the intermediate gutter 1 is at the highest position at a substantially central position in the roof width direction (X direction) of the lower-metal-plate roof A2, and the ends on both sides in the longitudinal direction from the center in the longitudinal direction of the intermediate gutter 1 are often in a substantially flat peak shape or umbrella shape that is lower. By doing so, especially even when the length of the lower-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 raised, and it can be arranged with a gentle slope so as to descend downward toward both sides in the longitudinal direction, thereby having an inclination angle θ for rainwater to flow, and the rainwater can be discharged from the intermediate gutter 1 from both sides in the roof width direction (X direction) of the lower-metal-plate roof A2.

Industrial Applicability

[0098] 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

[0099] A… Metal plate roof, A1… Upper-metal-plate roof, A2… Lower-metal-plate roof, B… Rainwater guide, C… Existing roof, S… Gap portion, 1… Intermediate gutter, 11… Rainwater receiving rising portion, 12… Bottom, 13… Upper-side attachment portion, 2… Gutter base member, 3… Peak-shaped reinforcement, 4… Gutter fixing material, 5… Upper-side roof plate material, 6… Lower-side roof plate material, 7… Guide plate material, 7m… Horizontal side, 7n… Vertical side, 7t… Step-shaped end portion, 7k… Gentle slope portion, 73… Zigzag portion.

Claims

1. 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 as a separate member 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, and the above-water side end and the below-water side end of the rainwater guide are each formed to be parallel to the width direction of the rainwater guide, 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 installed on the underwater side of the roof, and the roof is then installed on the underwater side of the roof. The roof is then installed on the underwater side of the roof, and the roof is then installed on the underwater side of the roof. The roof is then installed on the underwater side of the roof, and the roof is then installed on the underwater side of the roof. 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.

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 metal roof in an overlapping state.

3. In the roof drainage structure according to claim 2, the gentle slope portion of the rainwater guide is formed through a zigzag portion formed by irregularities, and the roof drainage structure is characterized by this.

4. In the roof drainage structure according to claim 3, the gentle slope portion of the rainwater guide is formed by warping the underwater side of the rainwater guide upward, and the roof drainage structure is characterized by this.

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