Rainwater drainage member and rainwater drainage system

Abstract

To provide a compact rainwater drainage member and a rainwater drainage system.SOLUTION: A rainwater drainage member 4 provided with a first opening 37 at the top comprises a first member 21, which is hollow and has a rectangular cross section, and a second member 22 which is a drain provided in the first opening 37.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rainwater drainage member and a rainwater drainage system. [Background technology]

[0002] Conventionally, there is known a parapet structure described in the following Patent Document 1. In this parapet structure, a circular pipe is used in the portion that crosses the parapet to drain water (the portion that is pulled horizontally). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-270391 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional structure, construction is difficult when the construction conditions are such that the parapet height is not very high.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a compact rainwater drainage member and rainwater drainage system. [Means for solving the problem]

[0006] A rainwater drainage member according to one aspect of the present invention includes a first member that is hollow and has a rectangular cross section and has a first opening at its top, and a second member that is a drain provided in the first opening. Effect of the Invention

[0007] According to the present invention, a compact rainwater drainage member and a rainwater drainage system can be provided. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a storm water drainage system according to an embodiment of the present invention. [Diagram 2] 1 is a perspective view of a rainwater drainage member according to an embodiment, disassembled into a first member and a second member. FIG. [Diagram 3] 3 is a perspective view of the first box drain in FIG. 2 exploded into a box drain portion and a fitting portion. FIG. [Figure 4] FIG. 2 is a plan view showing a rainwater drainage member according to an embodiment. [Diagram 5] FIG. 2 is a bottom view showing the rainwater drainage member according to the embodiment. [Figure 6] FIG. 2 is a side view (left side view) of the rainwater drainage member according to the embodiment, seen from one side. [Figure 7] 4 is a side view (right side view) of the rainwater drainage member according to the embodiment as viewed from the other side. FIG. [Figure 8] FIG. 2 is a front view of the rainwater drainage member according to the embodiment, seen from the downstream side. [Figure 9] FIG. 4 is a rear view of the rainwater drainage member according to the embodiment, seen from the upstream side. [Figure 10] 1 is a perspective view of a second box drain of the rainwater drainage member according to the embodiment, viewed from the downstream side. FIG. [Figure 11] FIG. 11 is a cross-sectional view of the second box drain of FIG. 10 taken along line AA. [Figure 12] FIG. 13 is a perspective view showing an example in which a rainwater drainage member according to an embodiment has a mark for alignment. [Figure 13] FIG. 2 is an exploded perspective view of a rainwater drainage member according to a first modified example of the embodiment. [Figure 14] FIG. 11 is an exploded perspective view of a rainwater drainage member according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a rainwater drainage member and a rainwater drainage system according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, arrow A indicates the direction of rainwater flow from the upstream side to the downstream side when the rainwater drainage member is used as a reference. Also, arrow B indicates the upward direction.

[0010] As shown in Fig. 1, the storm water drainage system 1 is used, for example, in a building 100 provided with a parapet 102. The parapet 102 is provided, for example, on the periphery of a balcony 103. The parapet 102 rises upward, for example, from a boundary 105 between the balcony 103 and an exterior wall 104 of the building 100. The parapet 102 may also be provided, for example, on the periphery of a roof, or rise upward from the boundary between the roof and an exterior wall. The rainwater drainage system 1 drains rainwater that has flowed into a gutter 2 inside a parapet 102 to the outside of the parapet 102 using a rainwater drainage member 4. The rainwater drainage system 1 includes the gutter 2, the rainwater drainage member 4, a sump 6, and a pipe 8.

[0011] The gutter 2 is disposed in a recess 107 formed on the inside of the parapet 102. Examples of the gutter 2 include a metal gutter and a resin gutter. The gutter 2 has a bottom 11, an outer wall 12, an inner wall 13, and a flange 14. The bottom 11, the outer wall 12, and the inner wall 13 form a roughly U-shaped cross section of the gutter 2. A second opening (not shown) is provided in the bottom 11 of the gutter 2. A rainwater drainage member 4 is connected to the second opening of the bottom 11 so as to communicate with the inside of the gutter 2. The flange 14 may be omitted. Rainwater flows into the gutter 2 from, for example, the balcony 103 of the building 100. The rainwater that flows into the gutter 2 passes through a first member 21 of the rainwater drainage member 4 and flows into a second member 22 (both of which will be described later). The rainwater drainage member 4 penetrates the parapet 102 and is connected to the gutter 2 and the manhole 6.

[0012] 1 to 3, the rainwater drainage member 4 includes a first member 21 and a second member 22. The rainwater drainage member 4 sandwiches the bottom 11 of the gutter 2 between the first member 21 and the second member 22. The first member 21 is connected to the bottom 11 of the gutter 2 from below. The first member 21 includes, for example, a first box drain 24 and a second box drain 25.

[0013] 2 to 9, the first box drain 24 includes a box drain portion 27 and a fitting portion 28. The box drain portion 27 and the fitting portion 28 are made of metal or thermoplastic resin. The box drain portion 27 and the fitting portion 28 are preferably injection molded from a thermoplastic resin. Examples of the thermoplastic resin include polyvinyl chloride resin, PP (polypropylene), PE (polyethylene), AES (acrylonitrile-ethylene-styrene copolymer resin), and ABS (acrylonitrile-butadiene-styrene copolymer resin). By forming the box drain portion 27 and the fitting portion 28 from a thermoplastic resin, the box drain portion 27 and the fitting portion 28 can be made lighter than if they were made from a metal, making on-site installation easier.

[0014] The box drain section 27 has a first side wall 31, a first apex (top) 32, and a first bottom 33. The first side wall 31 has an upstream portion formed in a semicircular arc shape in a plan view. Hereinafter, the upstream portion may be referred to as a semicircular arc portion. The first side wall 31 has a pair of downstream ends 31a of the semicircular arc portion that extend linearly downstream. The first apex 32 is provided on the upper side of the first side wall 31. The first apex 32 has an opening 35 formed in a circular shape. The opening 35 is connected to the annular fitting section 28. The fitting section 28 has a first opening 37 on the inside of the peripheral wall 36 (see FIG. 8). The first opening 37 has an internal thread 38 on its inner periphery. The internal thread 38 will be described in detail later.

[0015] The first bottom 33 is provided on the lower side of the first side wall 31. The box drain section 27 is formed hollow by the first side wall 31, the first top 32, and the first bottom 33. The downstream end 27a of the box drain section 27 is formed to have a rectangular cross section when viewed from the downstream side. The downstream end 27a of the box drain section 27 is provided with a spigot 41 extending downstream. A receptacle 42 of the second box drain 25 is fitted into the spigot 41 at the downstream end 27a from the downstream side.

[0016] The second box drain 25 has a pair of second side walls 45, a second top 46, and a second bottom (bottom) 47. The second box drain 25 is made of metal or thermoplastic resin. It is preferable that the second box drain 25 is injection molded from thermoplastic resin. Examples of thermoplastic resin include polyvinyl chloride resin, PP (polypropylene), PE (polyethylene), AES (acrylonitrile-ethylene-styrene copolymer resin), ABS (acrylonitrile-butadiene-styrene copolymer resin), etc. By forming the second box drain 25 from a thermoplastic resin, the second box drain 25 can be made lighter than if it were made from a metal, and construction on site can be facilitated.

[0017] The second side wall 45 extends linearly from a pair of ends 31a of the first side wall 31 of the first box drain 24 to the downstream side. The second peaks 46 are provided on the upper sides of the pair of second side walls 45. The second peaks 46 have, for example, a raised portion 49. The raised portion 49 is, for example, raised in a slightly curved shape upward from the second peak 46. The raised portion 49 is formed so that its width gradually decreases from the downstream end 46a of the second peak 46 toward the upstream side.

[0018] By providing the protuberance 49 on the second top 46, for example, it is possible to suppress a dent occurring on the second top 46 when the second box drain 25 is injection molded from a thermoplastic resin, thereby improving the design. In addition, the surface of the second top 46 may be provided with decorative irregularities, knurling, or the like. The raised portion 49, the decorative unevenness, knurling, etc. may be provided not only on the second top portion 46 but also on other surfaces such as the second side wall 45 and the second bottom portion 47. Furthermore, the raised portion 49, the decorative unevenness, knurling, etc. may not be provided.

[0019] As shown in Figs. 2, 9 and 10, the second bottom 47 is provided on the lower side of the pair of second side walls 45. A groove 51 is provided in the center of the width direction on the inner surface 47a of the second bottom 47. The groove 51 extends in the direction of the axis O of the first member 21. The direction of the axis O extends in the direction from the upstream side to the downstream side. In the embodiment, an example in which the groove 51 is provided on the inner surface 47a of the second bottom 47 will be described, but the groove 51 may be provided so as to be continuous with the inner surface 47a of the second bottom 47 and the inner surface 33a of the first bottom 33 (see Fig. 3). That is, the groove 51 may be provided on the inner surface of the entire bottom of the first member 21. The groove 51 is formed, for example, with a bottom surface 51a and a pair of side walls 51b to have a U-shaped cross section. It is desirable that (depth of groove 51) / (thickness of second bottom portion 47) is, for example, greater than 0% and not greater than 60%. If this value is greater than 60%, the depth of groove 51 becomes too large (groove 51 becomes too deep) relative to the thickness of second bottom portion 47 (thickness of the bottom portion of first member 21), and the strength of second bottom portion 47 may decrease. The length of groove 51 is formed to be ⅓ or more of the length of first member 21 in the direction of axis O of first member 21 (i.e., the longitudinal direction).

[0020] In the embodiment, an example in which the groove 51 is formed to have a U-shaped cross section will be described, but as other examples, the groove 51 may be formed to have other cross-sectional shapes such as a V-shape or an arc shape. Also, in the embodiment, an example in which one groove 51 is provided at the center in the width direction on the inner surface 47a will be described, but the number of grooves 51 may be selected arbitrarily. Also, an example in which the groove 51 is provided at the center in the width direction on the inner surface 47a will be described, but the groove 51 may be provided at any position in the width direction on the inner surface 47a.

[0021] Furthermore, the second bottom 47 is slightly inclined downward, for example, in the width direction from the pair of second side walls 45 toward the center (i.e., the groove 51). Therefore, rainwater can be guided to the groove 51 on the inner surface 47a of the second bottom 47. This allows the rainwater on the inner surface 47a to be properly drained through the groove 51. In the embodiment, an example in which the second bottom 47 is inclined toward the center in the width direction will be described, but the second bottom 47 may be formed flat.

[0022] Furthermore, a lip 54 is provided on the second bottom 47 of the second box drain 25. The lip 54 protrudes obliquely downward toward the downstream side from the entire width direction of the downstream end 47b of the second bottom 47.

[0023] 2 and 3, the second box drain 25 is formed to be hollow and have a rectangular cross section by a pair of second side walls 45, a second top portion 46, and a second bottom portion 47. The second box drain 25 is provided with a receiving port 42 on the upstream side. The receiving port 42 of the second box drain 25 is fitted into a spigot 41 of the first box drain 24 (specifically, the box drain portion 27). In this way, the second box drain 25 is connected to the box drain portion 27. In the embodiment, an example in which the second box drain 25 is provided with the receiving port 42 and the first box drain 24 is provided with the spigot 41 will be described, but the present invention is not limited to this. As another example, the second box drain 25 may be provided with a spigot and the first box drain 24 may be provided with a receiving port.

[0024] The first member 21 is formed to be hollow and have a rectangular cross section by connecting the first box drain 24 and the box drain portion 27. A first opening 37 is provided in a first top portion 32 of the first member 21 (the top portion of the first member 21). The first member 21 having a rectangular cross section includes, for example, the following shapes of the first member 21. That is, the first member 21 includes a plate-shaped top, a plate-shaped bottom, and two plate-shaped side walls. The top and bottom face each other in the up-down direction (vertical direction). The two side walls face each other in the left-right direction (horizontal direction) perpendicular to the up-down direction. Both ends of the top in the left-right direction are connected to the upper ends of the two side walls. Both ends of the bottom in the left-right direction are connected to the lower ends of the two side walls. The part (corner) where the top and the side walls are connected and the part (corner) where the bottom and the side walls are connected may form a right angle, may form a R-surface, or may form a C-surface. By providing a R-surface or a C-surface, for example, it is possible to prevent the connected part (corner) of the first member 21 from hitting another member or the like during construction, causing the other member to be damaged. The height H, which is the size of the first member 21 in the up-down direction (vertical direction), is smaller than the width W, which is the size of the first member 21 in the left-right direction (horizontal direction). The height H of the first member 21 may not be completely uniform over the entire area of ​​the first member 21. For example, the difference between the maximum value and the minimum value of the height H may be within 5% of the maximum value of the height H. For example, the height H of the first member 21 may increase from the end in the left-right direction toward the center. The width W of the first member 21 may not be completely uniform over the entire area of ​​the first member 21. For example, the difference between the maximum value and the minimum value of the width W may be within 5% of the maximum value of the width W. For example, the width W of the first member 21 may increase from the end in the up-down direction toward the center. The upper surface of the bottom may be inclined from the end in the left-right direction toward the center. In this case, the thin layer flowing on the bottom tends to be closer to the center in the left-right direction. The lower surface of the bottom may be a flat surface (horizontal surface). In this case, the installation state of the first member 21 is more likely to be stable during construction.

[0025] Here, the first member 21 is composed of, for example, a first box drain 24 and a second box drain 25. Moreover, the first box drain 24 is composed of a box drain portion 27 and a fitting portion 28. Therefore, the first member 21 is composed of, for example, a combination of a plurality of members, namely, the box drain portion 27, the fitting portion 28, and the second box drain 25. The box drain portion 27 and the second box drain 25 are divided into two in the longitudinal direction, which is the flow direction. Moreover, the box drain portion 27 and the fitting portion 28 are divided into two in the vertical direction.

[0026] A resin core material may be insert-molded during injection molding into the multiple members of the box drain portion 27, the fitting portion 28, and the second box drain 25 that constitute the first member 21. By insert-molding the core material, the strength of the multiple members can be increased.

[0027] As shown in FIG. 12, the box drain portion 27, the fitting portion 28, and the second box drain 25 constituting the first member 21 may have alignment marks. Specifically, the box drain portion 27 has a first mark 71 and a second mark 72. The first mark 71 and the second mark 72 are marked or provided at the division position, for example, on the first apex 32 of the box drain portion 27. The fitting portion 28 has a third mark 73. The third mark 73 is marked or provided at the division position, for example, on the surface of the fitting portion 28. The second box drain 25 has a fourth mark 74. The fourth mark 74 is marked or provided at the division position, for example, on the second apex 46.

[0028] Therefore, when constructing the first member 21 on-site, the box drain portion 27 and the fitting portion 28 are connected by visually aligning the third mark 73 of the fitting portion 28 with the first mark 71 of the box drain portion 27. This allows the fitting portion 28 to be connected in an aligned state to the box drain portion 27. Also, the box drain portion 27 and the second box drain 25 are joined by visually aligning the fourth mark 74 of the second box drain 25 with the second mark 72 of the box drain portion 27. This allows the second box drain 25 to be connected in an aligned state to the box drain portion 27.

[0029] As shown in FIG. 1, FIG. 5 to FIG. 7, a plurality of feet 56 are provided on the bottom of the first member 21 (i.e., the first bottom 33 and the second bottom 47). The plurality of feet 56 are protruded downward along the side walls (i.e., the first side wall 31 and the second side wall 45) of the first member 21 at the bottom of the first member 21. By providing the plurality of feet 56 on the bottom of the first member 21, it is possible to make the first member 21 come into contact with, for example, the floor 103a of the balcony 103 in the building 100. Therefore, it is possible to prevent the entire area of ​​the bottom of the first member 21 from coming into contact with the floor 103a. This makes it possible to prevent, for example, the entire area of ​​the bottom from being dragged by the floor 103a and scratched when the rainwater drainage member 4 is constructed on site.

[0030] 5 to 7 and 9, a plurality of ribs 58 are provided on the semicircular arc portion of the first side wall 31 of the box drain portion 27. The upper sides of the plurality of ribs 58 are connected to the first apex 32. As a result, the first apex 32 of the box drain portion 27 is reinforced by the plurality of ribs 58, and the rigidity is increased.

[0031] As shown in FIG. 2, the length of the first member 21 in the rainwater flow direction (i.e., the longitudinal direction) can be selected arbitrarily. The width W of the first member 21 in the horizontal direction is greater than the height H in the vertical direction. The minimum value of the inner width Wi of the first member 21 may be, for example, 50 mm to 300 mm. The minimum value of the inner height H of the first member 21 may be, for example, 10 mm to 120 mm. The maximum value of the outer width Wo of the first member 21 may be, for example, 52 mm to 320 mm. The maximum value of the outer height Ho of the first member 21 may be, for example, 12 mm to 140 mm. The minimum and maximum values ​​of the thickness of the first member 21 may be, for example, about 1 mm to 10 mm. In addition, in the first member 21, it is preferable that the inner height Hi / inner width Wi and the outer height Ho / outer width Wo are, for example, 0.1 to 0.4, respectively. In particular, in the first member 21, it is more preferable that the ratio of the inner height Hi to the inner width Wi and the outer height Ho to the outer width Wo are each 0.25 to 0.35. The range indicated by A to B means A or more and B or less (A is the lower limit and B is the upper limit), and A and B are included in the range.

[0032] Incidentally, when the minimum and maximum values ​​of the thickness of the first member 21 are 1 mm to 10 mm, it is possible to achieve compactness while ensuring strength. For example, when the thickness of the first member 21 is less than 1 mm, the first member 21 becomes too thin, and even if a material with high rigidity is used for the first member 21, the strength of the first member 21 may be insufficient. For example, when the thickness of the first member 21 is greater than 10 mm, the first member 21 becomes too thick, and may lack compactness.

[0033] As shown in Figs. 1 and 2, the second member 22 is provided at the first opening 37 of the fitting portion 28 in the first box drain 24. The second member 22 is a drain that guides rainwater in the gutter 2 to the first member 21. The second member 22 has a drain body 61, a flange 62, and a drain lower portion 63. The drain lower portion 63 is provided below the flange 62. The drain lower portion 63 is formed in a cylindrical shape. A male thread 65 is formed on the outer periphery of the drain lower portion 63. The flange 62 is provided at the upper portion of the drain lower portion 63. The flange 62 protrudes in an annular shape radially outward from the upper end of the drain lower portion 63.

[0034] The bottom 11 of the gutter 2 is interposed between the flange 62 of the second member 22 and the fitting portion 28 of the first member 21. The drain lower portion 63 of the second member 22 is inserted from above into a second opening (not shown) of the bottom 11. In this state, the male thread 65 of the second member 22 is screwed into the female thread 38 of the fitting portion 28. In this state, the bottom 11 of the gutter 2 is sandwiched between the first top portion 32 of the first member 21 and the flange 62 of the second member 22. As a result, the rainwater drainage member 4 (i.e., the first member 21 and the second member 22) is fixed from below to the bottom 11 of the gutter 2 (i.e., the gutter 2).

[0035] A drain body 61 is provided on the flange 62. The drain body 61 protrudes upward from the flange 62. When the rainwater drainage member 4 is fixed to the bottom 11 of the gutter 2, the drain body 61 protrudes upward from the bottom 11 of the gutter 2. The drain body 61 is disposed inside the gutter 2. The drain body 61 guides the rainwater in the gutter 2 to the drain lower part 63. The rainwater guided to the drain lower part 63 passes through the drain lower part 63 and flows into the inside of the first member 21. The drain body 61 is an inlet for draining rainwater, and is a known drain that suppresses the intrusion of dust during drainage. The drain body 61 includes a high-discharge drain and the like.

[0036] 2 and 8, the female thread 38 of the fitting portion 28 is provided in a first opening 37 of a peripheral wall 36 of the fitting portion 28. The peripheral wall 36 protrudes from the first top portion 32 of the box drain portion 27 to the inside of the first box drain 24. For this reason, if the peripheral wall 36 protrudes to the inside of the first box drain 24 by a large amount, the peripheral wall 36 may obstruct the water passage on the inside of the first box drain 24, and a sufficient amount of drainage may not be obtained.

[0037] Therefore, it is preferable to restrict the height of the drain lower part 63 in the second member 22 to 5 to 35% of the inner height of the first box drain 24. This makes it possible to restrict the height of the peripheral wall 36 that fits into the drain lower part 63. This makes it possible to suppress the peripheral wall 36 from blocking the water passage part on the inner side of the first box drain 24. For example, a double-thread may be used for the female thread 38 of the fitting portion 28 and the male thread 65 of the drain lower portion 63. This makes it possible to increase the fitting force of the male thread 65 with respect to the female thread 38 while keeping the height of the drain lower portion 63 in the second member 22 small.

[0038] In the embodiment, an example in which the fitting portion 28 of the first member 21 and the drain lower portion 63 of the second member 22 are screwed together will be described, but the present invention is not limited to this. As another example, the fitting portion 28 and the drain lower portion 63 may be fitted together in a concave-convex joint state or the like. However, by screwing the fitting portion 28 and the drain lower portion 63 together, a sufficient fitting force (bonding force) can be obtained during use. In addition, when the multiple members constituting the first member 21 are coated with adhesive during on-site construction, the multiple members can be prevented from floating up. Therefore, it is preferable to screw the fitting portion 28 and the drain lower portion 63 together.

[0039] As shown in FIG. 1, when the rainwater drainage member 4 is attached to the bottom 11 of the gutter 2, the first member 21 penetrates laterally into the parapet 102. The downstream end 21a of the first member 21 protrudes outside the parapet 102. A manhole 6 is connected to the downstream end 21a of the first member 21. The downstream end 21a of the first member 21 is disposed inside the manhole 6. The manhole 6 is attached to the building 100. An upper end 8a of a pipe 8 is connected to the manhole 6. The pipe 8 may be a resin pipe such as a VP pipe or a VU pipe made of polyvinyl chloride resin, or a steel pipe.

[0040] The pipe 8 may have an inner diameter of, for example, 0.05 to 0.16 m (nominal diameter 50 to 150). In particular, it is preferable to use the pipe 8 having an inner diameter of 0.07 m or more (nominal diameter 75 or more). Moreover, the first member 21 of the rainwater drainage member 4 is configured to have a size (shape) that does not impede the drainage capacity of the pipe 8. The size of the first member 21 is not particularly limited as long as it is a size that does not impede the drainage capacity of the pipe 8.

[0041] In the rainwater drainage system 1, for example, rainwater flows from a balcony 103 of a building 100 into a gutter 2. The rainwater that flows into the gutter 2 passes through a first member 21 of a rainwater drainage member 4 and flows into a second member 22. The rainwater that flows into the second member 22 passes through a manhole 6 and is drained into a pipe 8.

[0042] According to the rainwater drainage member 4 of the embodiment described above, as shown in Figs. 2 and 3, the second member 22 is provided as a drain in the first opening 37 of the first box drain 24 in the first member 21. Thus, rainwater that has passed through the second member 22 flows into the first member 21. This first member 21 has a rectangular cross section. Thus, by widening the lateral width W of the first member 21, it is possible to ensure the same flow path cross-sectional area as a pipe having a circular cross section while reducing the vertical height H. This allows the vertical height H of the second member 22 (i.e., the rainwater drainage member 4) to be reduced, and the rainwater drainage member 4 can be made compact. Furthermore, by making the first member 21 hollow and rectangular in cross section, it is not necessary to construct the first member 21 on-site by bending a metal plate or coil during construction, which makes construction on-site easy.

[0043] Furthermore, by making the first member 21 and the second member 22 out of thermoplastic resin, the members can be made lighter than if they were made out of metal, which allows the first member 21 and the second member 22 to be easily installed on-site.

[0044] In addition, for example, the first member 21 is configured by combining a plurality of members including the box drain portion 27, the fitting portion 28, and the second box drain 25. This allows each of the box drain portion 27, the fitting portion 28, and the second box drain 25 to be easily formed by injection molding. In particular, the box drain portion 27 and the second box drain 25 are divided into two in the longitudinal direction, which is the flow direction. This allows the box drain portion 27 and the second box drain 25 to be injection molded with a thin wall thickness without reducing the strength of each member while maintaining their rectangular cross-sectional shape.

[0045] As shown in FIGS. 2 and 10, for example, rainwater that has flowed into the first member 21 may remain at the bottom of the first member 21 (particularly, the second bottom portion 47). Therefore, a groove 51 is provided on the inner surface 47a of the second bottom 47 of the second box drain 25. By providing the groove 51 on the inner surface 47a, rainwater from the second bottom 47 can be properly drained along the groove 51. This allows the rainwater that has flowed into the first member 21 to be properly drained, and prevents the rainwater from remaining inside the first member 21 (specifically, at the bottom).

[0046] 1 and 10, for example, when rainwater that has flowed into the first member 21 is drained from the downstream end 21a, it is difficult for the rainwater to be properly drained at the downstream end 47b of the second bottom 47. For this reason, it is considered that some of the rainwater flows from the downstream end 47b to the back side of the second bottom 47, drips onto the outside of the manhole 6 connected to the end 21a of the first member 21, and splashes back. Therefore, the lip 54 is protruded obliquely downward from the downstream end 47b of the second bottom 47. Therefore, the rainwater that has flowed into the first member 21 can be guided along the lip 54, and can be properly drained by the lip 54. This allows the rainwater guided by the lip 54 to drip reliably into the inside of the manhole 6.

[0047] Moreover, according to the rainwater drainage system 1 of the embodiment, as shown in Fig. 1 and Fig. 2, the first member 21 of the rainwater drainage member 4 has a rectangular cross section. This reduces the vertical height H of the first member 21, making it possible to make the rainwater drainage member 4 compact. This makes it possible to ensure an area for penetrating the first member 21 into the parapet 102 even under construction conditions in which the height of the parapet 102 cannot be made high. This makes it easy to install the rainwater drainage member 4 on the parapet 102. Furthermore, by making the first member 21 have a rectangular cross section, it is not necessary to form the first member 21 by bending a metal plate or a coil at the construction site, which makes it easier to construct the rainwater drainage member 4 at the construction site.

[0048] Furthermore, by sandwiching the bottom 11 of the gutter 2 between the first member 21 and the second member 22, the first member 21 can be fixed to the bottom 11 of the gutter 2 (i.e., the gutter 2). Therefore, for example, when a plurality of members consisting of the box drain portion 27, the fitting portion 28, and the second box drain 25 constituting the first member 21 are combined and connected with an adhesive, the first member 21 can be stably supported by the gutter 2. This allows the first member 21 to be connected in a precisely combined state. Moreover, when the rainwater drainage member 4 is in use, the first member 21 can be stably supported by the gutter 2.

[0049] Next, modified examples of the rainwater drainage member 4 in the embodiment will be described with reference to Fig. 13 and Fig. 14. In the modified examples, the same or similar members as those in the rainwater drainage member 4 in the embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted. (Variation 1) As shown in Fig. 13, the rainwater drainage member 80 of the first modification example is obtained by dividing the first box drain 81 into two, an upper box drain 82 and a lower box drain 83. The first box drain 81 is assembled by connecting a plurality of members, the upper box drain 82 and the lower box drain 83. By combining the upper box drain 82 and the lower box drain 83, the first box drain 81 is configured to be hollow and have a rectangular cross section, similar to the first box drain 24 of the embodiment. This allows the rainwater drainage member 80 to be made compact, similar to the rainwater drainage member 4 of the embodiment.

[0050] Here, the upper box drain 82 has the female thread 38 integrally injection molded on the inner periphery of the first opening 37. As a result, according to the rainwater drainage member 80, it is not necessary to connect the fitting portion 28 (see FIG. 3) of the embodiment to the upper box drain 82.

[0051] (Variation 2) As shown in Fig. 14, the rainwater drainage member 90 of the second modification is obtained by dividing the first member 91 into two members, an upper box drain 92 and a lower box drain 93. The first member 91 is assembled by connecting a plurality of members, the upper box drain 92 and the lower box drain 93. By combining the upper box drain 92 and the lower box drain 93, the first member 91 is configured to be hollow and have a rectangular cross section, similar to the first member 21 of the embodiment. This allows the rainwater drainage member 90 to be made compact, similar to the rainwater drainage member 4 of the embodiment.

[0052] Here, the upper box drain 92 has a female screw 38 integrally formed by injection molding on the inner periphery of the first opening 37. As a result, according to the rainwater drainage member 90, it is not necessary to connect the fitting portion 28 (see FIG. 3) of the embodiment to the upper box drain 92.

[0053] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0054] For example, the gutter 2 may be omitted.

[0055] In addition, the components in this embodiment can be replaced with well-known components as appropriate without departing from the spirit of the present invention.

[0056] (Additional Note) <1> A rainwater drainage member according to one aspect of the present invention includes a first member that is hollow and has a rectangular cross section and has a first opening at its top, and a second member that is a drain provided in the first opening.

[0057] According to the rainwater drainage member, the second member is provided as a drain in the first opening of the first member. Thus, rainwater that has passed through the second member flows into the first member. This first member has a rectangular cross section. Therefore, by widening the lateral width of the first member, it is possible to ensure the same flow path cross-sectional area as a pipe with a circular cross section while keeping the vertical height low. This makes it possible to keep the vertical height of the second member (i.e., the rainwater drainage member) low, making the rainwater drainage member compact. Furthermore, by making the first member hollow and rectangular in cross section, there is no need to construct the first member on-site by bending sheet metal or coils during construction, which makes construction on-site easy.

[0058] <2> the above <1> In the rainwater drainage member according to the present invention, the first member and the second member may be made of a thermoplastic resin.

[0059] By making the first and second members out of thermoplastic resin, the members can be made lighter than if they were made out of metal, which makes it easier to install the first and second members on site.

[0060] <3> the above <1> or <2> In the rainwater drainage member according to the present invention, the first member may be configured by combining a plurality of members.

[0061] According to the rainwater drainage member, by configuring the first member by combining a plurality of members, each member can be easily formed by injection molding.

[0062] <4> the above <1> from <3> In the rainwater drainage member according to any one of the above aspects, a groove may be provided in a bottom portion of the first member, the groove extending in an axial direction of the first member.

[0063] Here, for example, it is conceivable that rainwater that has flowed into the first component will remain at the bottom of the first component. To address this issue, we decided to provide a groove at the bottom of the first component. By providing a groove at the bottom, the rainwater at the bottom can be properly drained along the groove. This allows the rainwater that has flowed into the first component to be properly drained, and prevents the rainwater from remaining inside the first component (specifically, at the bottom).

[0064] <5> the above <1> from <4> In the rainwater drainage member according to any one of the above aspects, a lip protruding obliquely downward may be provided on a downstream end of a bottom of the first member.

[0065] Here, for example, when rainwater that has flowed into the first member is drained from the downstream end, it is difficult for the rainwater to be properly drained at the downstream end of the bottom. As a result, some of the rainwater may flow from the downstream end to the back side of the bottom, dripping and splashing out of the drainage outlet (e.g., a catch basin) connected to the end of the first member. Therefore, a lip is protruded diagonally downward from the downstream end of the bottom. Therefore, rainwater that flows into the first member can be guided along the lip, allowing the rainwater to be properly drained by the lip. This allows the rainwater guided by the lip to drip reliably into the drain outlet (catchment area).

[0066] <6> The storm water drainage system according to one aspect of the present invention is <1> from <5> The present invention comprises a rainwater drainage member according to any one of the above embodiments, a manhole connected to the downstream end of the first member, and a pipe having an upper end connected to the manhole, wherein the first member penetrates the parapet of a building.

[0067] According to the rainwater drainage system, the first member of the rainwater drainage member has a rectangular cross section. This reduces the vertical height of the first member, making the rainwater drainage member compact. This ensures an area for the first member to penetrate the parapet even under construction conditions that do not allow the parapet to be high. This makes it easier to install the rainwater drainage member on the parapet. Furthermore, by making the first member have a rectangular cross section, there is no need to form the first member by bending sheet metal or coils at the construction site, which makes it easier to construct the rainwater drainage member at the construction site.

[0068] <7> the above <6> The rainwater drainage system according to the present invention may further include a gutter disposed inside the parapet, and the first member and the second member may sandwich a bottom of the gutter therebetween.

[0069] According to the rainwater drainage system, the first member can be fixed to the bottom of the gutter (i.e., the gutter) by sandwiching the bottom of the gutter between the first member and the second member. Therefore, for example, when multiple members constituting the first member are combined and connected with an adhesive, the first member can be stably supported by the gutter. This allows the first member to be connected in a precisely combined state. Furthermore, when the rainwater drainage member is in use, the first member can be stably supported by the gutter. [Explanation of symbols]

[0070] 1. Storm water drainage system 2. Gutter 4,80,90...Rainwater drainage material 6…Masu 8…Tube 8a…Top end of tube 11...Bottom of the gutter 21, 91…First member 21a...downstream end of the first member 22...Second member 24,81…1st box drain 25…Second box drain 27…Box drain section 28…Fitting part 32...1st top (top) 36...peripheral wall 37…First opening 47...Second bottom (bottom of first member) 47b...downstream end of second bottom 51...Groove 54...Lip 82,92…Top box drain 83,93…Bottom box drain 100…Building 102...Parapet O…Axis line

Claims

1. a first member having a first opening at a top portion thereof, being hollow and having a rectangular cross section; and a second member that is a drain provided in the first opening.

2. The rainwater drainage member according to claim 1 , wherein the first member and the second member are made of a thermoplastic resin.

3. The rainwater drainage member according to claim 1 , wherein the first member is formed by combining a plurality of members.

4. The rainwater drainage member according to claim 1 , wherein a groove is provided in a bottom portion of the first member, the groove extending in an axial direction of the first member.

5. The rainwater drainage member according to claim 1 , wherein a lip protruding obliquely downward is provided at a downstream end of a bottom of the first member.

6. A rainwater drainage member according to any one of claims 1 to 5, A manhole connected to a downstream end of the first member; A pipe having an upper end connected to the manhole, The first member is a storm water drainage system that penetrates a parapet of a building.

7. Further comprising a gutter disposed inside the parapet, The storm water drainage system according to claim 6 , wherein the first member and the second member sandwich a bottom portion of the gutter therebetween.

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