Rainwater drainage structure

Abstract

To provide a rainwater drainage structure which can prevent damage of an eaves gutter of a lean-to roof with rainwater from a vertical pipe flowing rainwater from an upper roof above the lean-to roof, and easily reduces the number of downpipes guiding the rainwater to the ground.SOLUTION: A rainwater drainage structure 1 includes: an eaves gutter 10 which is mounted on an eaves of a lean-to roof and has a through hole 50a and a dropping port 72; an upstream side downpipe 5 for making rainwater flow from a roof above the lean-to roof; and a downstream side downpipe 70 having a hanging pipe 20 hanged below the through hole 50a and a branched pipe 25 for making water from the dropping port 72 flow to the lower part. The hanging pipe 20 has a branch pipe 28 which is connected with one side end of the branched pipe 25, joins rainwater from the upstream side downpipe 5 and rainwater from the branched pipe 25, and has a diameter larger than that of the upstream side downpipe 5. At least a part of the upstream side downpipe 5 is loosely fit into the through hole 50a in a relatively movable state to the through hole 50a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a rainwater drainage structure that drains rainwater in a building having a roof. [Background technology]

[0002] Conventionally, there is a rainwater drainage structure described in Patent Document 1. As shown in Fig. 10, the rainwater drainage structure 601 has a cylindrical gutter body 604, called a crawling gutter, arranged along a lower roof 620. This cylindrical gutter body 604 is used to guide rainwater that falls on an upper roof 610 downward. The lower end of this cylindrical gutter body 604 is bent into a substantially L-shape, and the tip of the bent part is arranged in an eaves gutter 605 of the lower roof (lower roof) 620. This rainwater drainage structure 601 is designed to drain rainwater from the upper roof 610 by merging it with the eaves gutter 605 of the lower roof. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-71871 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rainwater drainage structure 601, rainwater that falls on the upper roof 610 is discharged into the eaves gutter 605 of the lower shed 620, so that it is possible to reduce the number of vertical gutters that direct rainwater directly from the upper roof 610 to the ground, and it is easy to reduce the number of vertical gutters that are likely to get in the way when located near the ground. However, in the rainwater drainage structure 601, if the amount of drainage increases and rainwater passes through the cylindrical gutter body 604 with few gaps, causing a siphon effect, there is a risk that the eaves gutter 605 of the lower shed will be damaged by the high water pressure of the rainwater merging from above, and there is also a risk that the rainwater in the eaves gutter 605 will splash up and overflow from the eaves gutter 605.

[0005] Therefore, the object of the present disclosure is to provide a rainwater drainage structure that can prevent the eaves gutters of the eaves from being damaged by rainwater from vertical pipes through which rainwater from the roof above the eaves flows, and that makes it easier to reduce the number of vertical gutters that direct rainwater to the ground. [Means for solving the problem]

[0006] In order to solve the above problems, the rainwater drainage structure disclosed herein is a rainwater drainage structure that is installed in a building with a eaves to drain rainwater, and includes an eaves gutter attached to the eaves of the eaves and having a through hole and a drop outlet, an upstream downspout that allows rainwater from a roof above the eaves to flow down, and a downstream downspout that has a vertical pipe suspended below the through hole and a branch pipe that allows water from the drop outlet to flow downward, and that joins the rainwater from the upstream downspout and the rainwater from the drop outlet and allows them to flow down, the vertical pipe is connected to one end of the branch pipe to join the rainwater from the upstream downspout and the rainwater from the branch pipe, and has a junction section that is larger in diameter than the upstream downspout, and at least a part of the upstream downspout is loosely fitted into the through hole in a state that is movable relative to the through hole.

[0007] In addition, when terms relating to the vertical direction, such as horizontal, upward, downward, upper side, and lower side, are used in this specification, these terms are intended to express the state in which the rainwater drainage structure is properly installed in a building with a roof. Effect of the Invention

[0008] According to the rainwater drainage structure disclosed herein, it is possible to prevent the eaves gutters of the eaves from being damaged by rainwater from vertical pipes through which rainwater flows from the roof above the eaves, and it is also easier to reduce the number of vertical gutters that direct rainwater to the ground. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a side view of the rainwater drainage structure according to the first embodiment of the present disclosure, showing only the standing wall of the rainwater drainage structure in cross section. [Diagram 2] FIG. 2 is an enlarged perspective view of the periphery of a vertical wall in the rainwater drainage structure. [Diagram 3] This is a cross-sectional view of the periphery of a vertical wall in a rainwater drainage structure cut along a plane including the central axis of the vertical wall and the width direction of the eaves gutter. [Figure 4] 1 in a modified rainwater drainage structure. FIG. [Diagram 5] FIG. 2 is a side view corresponding to FIG. 1 in a rainwater drainage structure of another modified example. [Figure 6] FIG. 2 is a side view corresponding to FIG. 1 in a rainwater drainage structure of another modified example. [Figure 7] FIG. 5 is a side view corresponding to FIG. 1 in a rainwater drainage structure according to a second embodiment. [Figure 8] This is a schematic plan view of the downstream downpipe of the rainwater drainage structure of the second embodiment when viewed from above in the vertical direction, and is a schematic diagram for explaining the inner diameter of the upper end of the vertical pipe and the inner diameter of the point in the branch pipe where the branch pipe is connected. [Figure 9] 8. (a) is a side view of the downstream downspout of the rainwater drainage structure of the second embodiment when viewed from the direction indicated by arrow A in FIG. 8, and (b) is a side view corresponding to (a) of the downstream downspout which differs from the downstream downspout shown in (a) only in that the radial center of the upper end of the vertical pipe is not eccentric with respect to the radial center of the maximum inner diameter part of the branch pipe. [Figure 10] FIG. 1 is a diagram illustrating a conventional rainwater drainage structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, when multiple embodiments and modified examples are included below, it is assumed from the beginning that new embodiments will be constructed by appropriately combining the characteristic parts of those. In addition, in the following examples, the same configurations in the drawings are given the same reference numerals, and duplicated explanations will be omitted. In addition, multiple drawings include schematic diagrams, and the dimensional ratios of length, width, height, etc. of each member between different drawings do not necessarily match. In addition, in this specification, the requirement of "approximately ~" is satisfied if a person looks roughly like ~. For example, the requirement of "extending in an approximately vertical direction" is satisfied if a person can be recognized as extending in a vertical direction.

[0011] In the following description, when words related to the vertical direction, such as horizontal, upper, lower, horizontal, upward, or downward, are used, the words express the state in which the rainwater drainage structures 1, 101, 201, 301, 401, and 501 are appropriately installed in the building. In the following description, when it is simply mentioned that two pipes are connected without any special explanation, it is assumed that the two pipes are connected by a fixing part composed of an adhesive, a press-fit part, or the like. In addition, among the components described below, components that are not described in the independent claim showing the highest concept are optional components and are not essential components.

[0012] (First embodiment) 1 is a side view of the rainwater drainage structure 1 according to the first embodiment of the present disclosure, showing only a vertical wall 50 of the rainwater drainage structure 1 in cross section. This rainwater drainage structure 1 is installed in a building having a structure similar to that shown in FIG. 10, that is, a building including an upper-story roof and a lower roof (lower-story roof) located below the upper-story roof.

[0013] As shown in Fig. 1, the rainwater drainage structure 1 comprises an upstream side downspout 5, an eaves gutter 10, and a downstream side downspout 70. The eaves gutter 10 has an eaves gutter main body 15 and a standing wall 50 as a tubular portion. The eaves gutter main body 15 extends along the eaves edge of the eaves of the eaves and collects rain that falls on the eaves. The eaves gutter main body 15 is installed at the eaves edge by fixing ears 11a, 11b (see Fig. 3) to the eaves edge of the eaves of the eaves at multiple intervals in the extension direction using hanging fittings (not shown).

[0014] Although not shown, the upstream downspout 5 is installed in the building in which the rainwater drainage structure 1 is installed, in a structure similar to the drainage pipe structure shown in Fig. 10. In detail, the rainwater drainage structure 1 is equipped with the upstream downspout 5, which includes an upper drainage pipe (corresponding to the drainage pipe indicated by reference number 603 in Fig. 10) that extends vertically downward from the eaves gutter of the upper roof along the wall of the building. The upstream downspout 5 also includes a lower drainage pipe (corresponding to the drainage pipe indicated by reference number 604 in Fig. 10) that is connected to the upper drainage pipe and extends downward along the lower roof.

[0015] Rainwater that falls on the upper roof is guided by the upstream downspout 5, so that it flows vertically downward along the wall of the building, and then flows down along the eaves of the eaves of the eaves. The lower end of the upstream downspout 5 includes a piping section that changes the extension direction, such as a 45° elbow (not shown). As a result, as shown in Fig. 1, the lower end 5a of the upstream downspout 5 extends in a substantially vertical direction. A portion of the lower end 5a is accommodated within the vertical wall 50, loosely fitting against the inner circumferential surface of the vertical wall 50.

[0016] The eaves gutter main body 15 has a through hole 14a in its bottom plate portion 14. The standing wall 50 is attached to the edge of the through hole 14a in the eaves gutter main body 15. The standing wall 50 has a cylindrical shape and extends in a substantially vertical direction (the height direction of the eaves gutter main body 15). The standing wall 50 prevents rainwater in the eaves gutter main body 15 from leaking to the outside through the through hole 14a. The structure of the standing wall 50 will be described in detail later with reference to Figures 2 and 3.

[0017] The downstream downspout 70 has a vertical pipe 20 and a branch pipe 25. The vertical pipe 20 is vertically installed below the through hole 50a of the vertical wall 50. More specifically, the vertical pipe 20 extends in a substantially vertical direction from the underside of the eaves gutter main body 15 to the ground, and is used to guide rainwater that falls on the upper roof to the ground. The vertical pipe 20 includes a first vertical pipe 22, a connecting pipe 26, a branch pipe 28 that constitutes the junction, and a second vertical pipe 30. These pipes 22, 26, 28, and 30 may be made of a resin material such as polyvinyl chloride, or may be made of a metal material such as cast iron.

[0018] The first vertical pipe 22 extends in a substantially vertical direction. The inner peripheral surface of the upper end of the first vertical pipe 22 is fixed and connected to the outer peripheral surface of the lower end of the standing wall 50. This makes it possible to prevent rainwater flowing inside the standing wall 50 from leaking to the outside, and to substantially prevent rainwater that has passed through the through hole 14a of the eaves gutter 10 from leaking to the outside. The connecting pipe 26 extends in a substantially vertical direction. The upper end of the connecting pipe 26 is connected to the lower end of the first vertical pipe 22. Each of the first vertical pipe 22 and the connecting pipe 26 is composed of a VP pipe, a VU pipe, or the like.

[0019] Branch pipe 28 is composed of a bifurcated T-shaped joint (90° Y-pipe) and has the function of joining rainwater flowing down from above along two different routes. Branch pipe 28 has main pipe section 28a extending in a substantially vertical direction and branch pipe section 28b, and branch pipe section 28b extends in a substantially horizontal direction from the center of main pipe section 28a in the extending direction. The upper end of main pipe section 28a is connected to the lower end of connecting pipe 26, and the upper end of second vertical pipe 30 is connected to the lower end of main pipe section 28a. Second vertical pipe 30 extends in a vertical direction and guides rainwater from main pipe section 28a to ground 55.

[0020] A portion of the lower end 5a of the upstream downpipe 5 is accommodated within the vertical wall 50 while loosely fitting into the inner circumferential surface of the vertical wall 50, and the inner diameter of the lower end 5a is smaller than the inner diameter of the vertical wall 50. Meanwhile, the inner circumferential surface of the upper end of the first vertical pipe 22 is fixed to the outer circumferential surface of the lower end of the vertical wall 50. Therefore, the inner diameter of the first vertical pipe 22 can be made larger than the inner diameter of the lower end 5a. The inner diameters of the first vertical pipe 22, the main pipe portion 28a, and the second vertical pipe 30 are all larger than the inner diameter of the lower end 5a.

[0021] Since the inner diameter of the upright pipe 20 is larger than the inner diameter of the lower end 5a, even if rainwater passes through the upstream downspout 5 with little clearance and a siphoning phenomenon occurs, the water pressure of the rainwater flowing through the first vertical pipe 22 can be reduced. This prevents the rainwater flowing from the branch pipe section 28b from being bounced back by the water pressure of the rainwater flowing through the main pipe section 28a and becoming less likely to flow to the second vertical pipe 30 side, and allows the rainwater from the branch pipe section 28b to flow smoothly to the second vertical pipe 30 side.

[0022] Furthermore, such a structure allows the inner diameter of the vertical pipe 20 to be larger than the inner diameter of the lower end 5a of the upstream downspout 5, so there is no need to configure a part of the vertical pipe 20 with an increaser for increasing the inner diameter and reducing the water pressure. Therefore, compared to a structure in which the vertical pipe has an increaser, the length of the vertical pipe 20 can be shortened, the rainwater drainage structure 1 can be made compact, and the manufacturing cost of the rainwater drainage structure 1 can be reduced. In addition, since the vertical pipe 20 does not have an increaser, the outer diameter of the vertical pipe 20, which is located below the eaves gutter 10 and is easy to see, can be kept almost constant. Therefore, a stylish and aesthetically pleasing vertical pipe 20 can be constructed.

[0023] The eaves gutter 10 has a drop opening 72 installed in the eaves gutter main body 15. The branch pipe 25 also has a downspout joint 74, an elbow 78, and a nominal gutter 80. A through hole 14b is provided in the bottom plate portion 14 of the eaves gutter main body 15 in addition to the above-mentioned through hole 14a. The drop opening 72 is disposed so as to pass through the through hole 14b, and has a substantially cylindrical lower portion (not shown) that protrudes downward from the eaves gutter main body 15. A male thread is provided in the lower portion of the drop opening 72.

[0024] The downspout joint 74 is an annular member and has a radially expanding annular flange 74a at its upper end. The downspout joint 74 has a female thread on its inner circumferential surface. The female thread of the downspout joint 74 is screwed into the male thread of the lower portion of the downspout 72, and the downspout joint 74 is fastened to the upper portion 72a of the downspout 72. The downspout 72 and the downspout joint 74 are then fixed to the eaves gutter main body 15 by sandwiching the annular edge of the through hole 14b from above and below between the flange 74a of the downspout joint 74 and the upper portion 72a of the downspout 72.

[0025] The upper end of the elbow 78 is connected to the lower end of the downspout joint 74. In this embodiment, the elbow 78 is configured as a 90° elbow. The elbow 78 changes the flow direction of rainwater from vertically upward to horizontally. The first end of the call pipe 80 is connected to the lower end of the elbow 78. The call pipe 80 is configured as a VP pipe, a VU pipe, or the like, and extends in a substantially horizontal direction. The second end of the call pipe 80 is connected to the branch pipe section 28b of the branch pipe 28. The call pipe 80 guides the rainwater from the elbow 78 to the branch pipe section 28b and merges into the branch pipe 28. The vertical length t from the surrounding area where the rainwater flowing down the two routes merge, that is, the midpoint of the height position of the main pipe section 28a to the ground, may be any length, but is preferably 3m or more.

[0026] By installing the drop outlet 72 and the branch pipe 25, rainwater from the eaves gutter from the lower eaves can be guided into the second vertical pipe 30 via the eaves gutter main body 15, the drop outlet 72, the branch pipe 25, and the branch pipe section 28b. Therefore, rainwater from the upper roof that has flowed down the vertical pipe 20 and rainwater from the eaves gutter 10 of the lower eaves can be guided down the branch pipe 25 to the ground through the same second vertical pipe 30, and as a result, the number of vertical gutters near the ground can be reduced.

[0027] 2 is an enlarged perspective view of the periphery of the vertical wall in the rainwater drainage structure 1, and FIG. 3 is a cross-sectional view of the periphery of the vertical wall in the rainwater drainage structure 1 cut on a plane including the central axis of the vertical wall 50 and the width direction of the eaves gutter main body 15. As shown in FIG. 2, the vertical wall 50 has a tubular structure and covers a part of the lower end 5a of the upstream downpipe 5 over the entire circumference. As shown in FIG. 3, the upper end 53 of the vertical wall 50 is located in the vicinity of the lower end 17 of the ears 11a, 11b that engage the hanger in the eaves gutter 10 in the vertical direction (the height direction of the eaves gutter main body 15). Here, in the height direction, the vicinity of the lower end 17 of the ears 11a, 11b may be defined as a height range from a position 2 cm higher than the lower end 17 of the ears 11a, 11b to a position 5 cm lower than the lower end 17 of the ears 11a, 11b.

[0028] As shown in FIG. 3, the standing wall 50 has a first standing wall 52 and a second standing wall 62. The first standing wall 52 includes a first standing wall portion 54 that covers the entire lower end portion 5a of the upstream side vertical gutter 5 in the eaves gutter 10. The first standing wall 52 also includes an annular upper edge contact portion 56 that is connected to the lower end portion of the first standing wall portion 54. The annular upper edge contact portion 56 contacts the upper annular edge portion 13 located around the through hole 14a on the bottom surface 19 of the eaves gutter main body 15. The first standing wall 52 also includes a second standing wall portion 58 that extends from the radially inner end portion of the upper edge contact portion 56 through the through hole 14a to a position lower than the eaves gutter main body 15. The second standing wall portion 58 has a male thread 58a in a portion located lower than the eaves gutter main body 15.

[0029] On the other hand, the second standing wall 62 includes an annular lower edge contact portion 64 that contacts the lower annular edge portion 16 located around the through hole 14a on the lower surface of the eaves gutter 10. The second standing wall 62 also has a third standing wall portion 66 that extends downward from the radially inner end of the lower edge contact portion 64 and has an internal thread 66a that screws into the external thread 58a. With the upper edge contact portion 56 of the first standing wall 52 abutting against the upper annular edge portion 13 of the eaves gutter main body 15, the internal thread 66a of the third standing wall portion 66 of the second standing wall 62 is tightened into the external thread 58a from below in the vertical direction.

[0030] In this way, the annular peripheral portion located on the periphery of the through hole 14a in the bottom plate portion 14 of the eaves gutter body 15 is sandwiched between the upper edge contact portion 56 of the first standing wall 52 and the lower edge contact portion 64 of the second standing wall 62, so that the standing wall 50 is attached to the bottom plate portion 14 of the eaves gutter body 15 while preventing water leakage from the through hole 14a. The lower end portion 5a of the upstream side vertical gutter 5 is not fixed to the vertical wall 50, but is loosely fitted to the inner peripheral surface of the vertical wall 50. In addition, the lower end portion 5a of the upstream side vertical gutter 5 is not fixed to the vertical pipe 20, but is loosely fitted to the inner peripheral surface of the vertical pipe 20. In the example shown in FIG. 3, the lower end 5b of the lower end portion 5a of the upstream side vertical gutter 5 reaches the inside of the branch pipe 28. In other words, the upstream side vertical gutter 5 has an insertion portion 5c that is inserted into the branch pipe 28.

[0031] As described above, the rainwater drainage structure 1 is a structure that is installed in a building with a eaves and drains rainwater. The rainwater drainage structure 1 includes an eaves gutter 10 that is attached to the eaves of the eaves and has a through hole 50a and a drop outlet 72, and an upstream side downspout 5 that drains rainwater from a roof above the eaves. The rainwater drainage structure 1 also includes a downstream side downspout 70 that has a vertical pipe 20 that is vertically installed below the through hole 50a and a branch pipe 25 that allows water from the drop outlet 72 to flow downward. The downstream side downspout 70 merges rainwater from the upstream side downspout 5 and rainwater from the drop outlet 72 and allows it to flow down. The vertical pipe 20 has a branch pipe (confluence part) 28 to which one end of the branch pipe 25 is connected to merge the rainwater from the upstream side downspout 5 and the rainwater from the branch pipe 25, and which has a larger diameter than the upstream side downspout 5. At least a portion of the upstream downspout 5 is loosely fitted in the through hole 50a in a state in which it is movable relative to the through hole 50a.

[0032] According to the present disclosure, at least a portion of the upstream downspout 5 that drains rainwater that falls on the upper roof above the eaves is loosely fitted into the through hole 50a provided in the eaves gutter 10, so that rainwater that falls on the upper roof does not flow into the eaves gutter main body 15. Therefore, it is possible to prevent the eaves gutter 10 of the eaves of the eaves from being damaged by rainwater from the upstream downspout 5 through which rainwater from the upper roof flows.

[0033] Furthermore, the drop outlet 72 and the branch pipe 25 allow the rainwater from the eaves gutter 10 to merge with the rainwater flowing in the vertical pipe 20 at a position below the eaves gutter 10. Therefore, the rainwater in the eaves gutter 10 of the lower eaves can be guided to the ground using the vertical pipe 20 that guides the rainwater that has fallen on the upper roof to the ground 55, and both the rain that has fallen on the upper roof and the rain that has fallen on the lower eaves can be guided to the ground using the common second vertical pipe 30 connected to the lower end of the branch pipe 28. This also reduces the number of vertical gutters, which tend to get in the way when located near the ground.

[0034] Furthermore, a structure is adopted in which at least a portion of the upstream downspout 5 is loosely fitted into the through hole 50a while being movable relative to the through hole 50a, so there is no need to precisely align the upstream downspout 5, making the rainwater drainage structure 1 easy to install.

[0035] Moreover, the eaves gutter 10 may have a standing wall (cylindrical portion) 50 extending in the height direction of the eaves gutter 10, and the through hole 50a may be provided in the standing wall 50.

[0036] According to this configuration, the vertical wall 50 clearly separates rainwater that falls on the upper roof and flows down the upstream downpipe 5 from rainwater flowing within the eaves gutter main body 15, thereby more reliably preventing damage to the eaves gutter 10 of the lower eaves roof by rainwater from the upstream downpipe 5.

[0037] In addition, the upper end of the vertical pipe 20 may be connected to the lower end of the vertical wall 50 and fixed.

[0038] According to this configuration, almost all rainwater flowing downward within the vertical wall 50 can be made to flow into the vertical pipe 20, and water leakage from the eaves gutter 10 around the vertical wall can be substantially prevented.

[0039] Furthermore, the upstream downspout 5 may include an insertion portion 5c that is inserted into the branch pipe .

[0040] According to this configuration, rainwater from the upstream downspout 5 can be released within the vertical pipe 20, which makes it easier to stabilize the behavior of the rainwater from the upstream downspout 5 and makes it easier to allow the rainwater from the upstream downspout 5 to flow down smoothly.

[0041] In the rainwater drainage structure 1, the lower end 5b of the upstream downspout 5 is located in the branch pipe (junction) 28. However, as shown in FIG. 4, that is, a side view of the rainwater drainage structure 101 of the modified example corresponding to FIG. 1, the lower end 105b of the upstream downspout 105 may be located at a position lower than the branch pipe (junction) 28 in the vertical pipe 20. In this way, the rainwater from the upstream downspout 105 and the rainwater from the drop outlet 72 can be prevented from colliding in the branch pipe 28 and can be made to collide below that, so that the rainwater from the drop outlet 72 can be prevented from colliding with the rainwater from the upstream downspout 105 and flowing back, and the rainwater from the two routes can be made to flow smoothly downward.

[0042] 5, that is, a side view of the rainwater drainage structure 201 of another modified example corresponding to FIG. 1, the lower end 205b of the upstream downpipe 205 may be located above the vertical pipe 20, or may be located within the vertical wall 50. In this way, the length of the upstream downpipe 205 can be reduced, and therefore the manufacturing cost of the upstream downpipe 205 can be reduced, and therefore the manufacturing cost of the rainwater drainage structure 201 can be reduced.

[0043] Also, the case where the upper end of the vertical pipe 20 is connected to the lower end of the vertical wall 50 and fixed has been described. However, the upper end of the vertical pipe does not have to be connected to the lower end of the vertical wall, and does not have to be fixed to the lower end. In this case, as shown in FIG. 6, that is, a side view corresponding to FIG. 1 of a rainwater drainage structure 301 of another modified example, the upper end 320a of the vertical pipe 320 may be provided above the lower end of the vertical wall 50. Also, the upper end 320b of the vertical pipe 320 may contact the bottom wall lower surface 29 of the eaves gutter 10. The vertical pipe 320 extends in a substantially vertical direction by being fixed to a wall portion extending in the vertical direction in a building (not shown) using a hanging metal fitting (not shown). The installation position of the vertical pipe 320 can be precisely adjusted when the vertical pipe 320 is fixed.

[0044] According to this configuration, the upper end 320a of the vertical pipe 320 is located above the lower end of the standing wall 50. Therefore, as shown in Fig. 6, by accommodating the outer peripheral surface of the lower end of the standing wall 50 within the vertical pipe 320, it is possible to prevent rainwater passing through the inside of the standing wall 50 from leaking to the outside, even if the standing wall 50 is not connected (fixed) to the vertical pipe 320.

[0045] In addition, the upper end 320b of the vertical pipe 320 contacts the bottom wall underside 29 of the eaves gutter 10, and no gap exists between the upper end 320b of the vertical pipe 320 and the bottom wall underside 29 of the eaves gutter 10. Therefore, not only can the rainwater drainage structure 301 be configured compactly, but it can also be made stylish and aesthetically pleasing.

[0046] Although not shown in the figures, the upper end of the vertical pipe may be located below the lower end of the vertical wall while being spaced apart in the vertical direction from the lower end of the vertical wall. Even in this case, by making all of the lower openings of the vertical wall overlap with the upper openings of the vertical pipe when viewed from above in the vertical direction, almost all of the rainwater passing through the vertical wall can be made to flow into the vertical pipe, and it is possible to substantially prevent the rainwater passing through the vertical wall from leaking to the outside.

[0047] Second embodiment FIG. 7 is a side view of the rainwater drainage structure 401 of the second embodiment, corresponding to FIG. 1. In the rainwater drainage structure 1 of the first embodiment, the case where the vertical pipe 20 does not have an expanded diameter portion has been described. However, as shown in FIG. 7, the vertical pipe 420 may include an expanded diameter portion 435 in order to allow rainwater from the branch pipe 425 to flow more smoothly downstream. More specifically, in the rainwater drainage structure 401, the upper end of the main pipe portion 428a extending in a substantially vertical direction in the branch pipe 428 included in the vertical pipe 420 and constituting the junction is the expanded diameter portion 435. The inner diameter of the expanded diameter portion 435 gradually increases toward the lower side.

[0048] 8 is a schematic plan view of the downstream downspout 470 of the rainwater drainage structure 401 viewed from above in the vertical direction, and is a schematic diagram for explaining the inner diameter of the upper end of the vertical pipe 420 and the inner diameter of the part of the branch pipe 428 where the branch pipe 425 is connected. As shown in FIG. 8, in the rainwater drainage structure 401, the inner diameter of the upper end of the vertical pipe 420 is smaller than the maximum inner diameter of the branch pipe (junction) 428. The radial center P1 of the upper end of the vertical pipe 420 is eccentric with respect to the radial center P2 of the maximum inner diameter part of the branch pipe 428 so that the projection dimension t2 of the upper end of the vertical pipe 420 from the wall part 490 of the building and the projection dimension t3 of the branch pipe (junction) 428 from the wall part 490 of the building are approximately equal (the eccentric dimension is indicated by t4).

[0049] Fig. 9(a) is a side view of the downstream downpipe 470 when viewed from the direction indicated by the arrow A in Fig. 8. Also, Fig. 9(b) is a side view corresponding to Fig. 9(a) of the downstream downpipe 570 which differs from the downstream downpipe 470 only in that the radial center of the upper end of the vertical pipe 520 is not eccentric with respect to the radial center of the maximum inner diameter part of the branch pipe 528.

[0050] As shown in Figure 9 (b), when the vertical pipe 520 has an expanded diameter section 535, if the radial center of the upper end of the vertical pipe 520 is not offset from the radial center of the maximum inner diameter section of the branch pipe 528, the projection dimension t5, which is the distance between the vertical pipe 520 and the wall section 590, will vary greatly, which may impair the aesthetic appearance.

[0051] 9(a), when the vertical pipe 420 has an expanded diameter portion 435, by making the radial center P1 of the upper end of the vertical pipe 420 eccentric with respect to the radial center P2 of the maximum inner diameter portion of the branch pipe 428, the projection dimension t2 (t3), which is the distance between the vertical pipe 420 and the wall portion 490, can be made substantially constant and aligned. Therefore, a stylish and beautiful vertical pipe 420 can be constructed.

[0052] It has been explained that when the vertical pipe 420 has the expanded diameter portion 435, a stylish and beautiful vertical pipe 420 can be constructed by making the radial center P1 of the upper end of the vertical pipe 420 eccentric with respect to the radial center P2 of the maximum inner diameter portion of the branch pipe 428. However, as shown in Fig. 9(b), the rainwater drainage structure 501 of the present disclosure may have the vertical pipe 520, and when the vertical pipe 520 has the expanded diameter portion 535, the radial center of the upper end of the vertical pipe 520 does not have to be eccentric with respect to the radial center of the maximum inner diameter portion of the branch pipe 528.

[0053] Also, the case has been described where the upper end of branch pipe 428 constituting the junction is constituted by expanded diameter section 435. However, the increaser (expanded diameter section) may be constituted by a separate member from the branch pipe constituting the junction, and the increaser may be installed above (upstream of) the junction in the vertical pipe.

[0054] The present disclosure is not limited to the above-described embodiment and its modified examples, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents.

[0055] For example, in the above embodiment, the upper end 53 of the standing wall 50 is located near the lower ends 17 of the ears 11a, 11b of the eaves gutter 10 in the height direction. However, the upper end of the standing wall may be located at any position other than near the lower ends of the ears of the eaves gutter, for example, it may be located near the upper ends of the ears of the eaves gutter, or it may be located lower than near the lower ends of the ears of the eaves gutter.

[0056] Also, the case has been described in which the drop outlet 72 is attached to the bottom plate portion 14 of the eaves gutter 10 by screwing the drop outlet 72 to the downspout joint 74. However, the drain may be attached to the bottom plate portion of the downspout by fixing the drop outlet to the downspout joint or piping with an adhesive, bolting, or press-fitting.

[0057] Also, the rainwater drainage structure 1 has been described as including a 90° Y pipe (T-joint) and a 90° elbow as the junction. However, the rainwater drainage structure may be configured with any structure that can cause rainwater from the eaves gutter to merge with rainwater flowing in the vertical pipe at a position below the eaves gutter, and for example, a 45° Y pipe may be used as the junction instead of the 90° Y pipe, and a 45° elbow may be used instead of the 90° elbow.

[0058] Also, the rainwater drainage structure 1 has been described as having the vertical wall (cylindrical portion) 50. However, the rainwater drainage structure does not have to have a cylindrical portion, and for example, the lower end of the upstream downspout may be loosely fitted into a through hole provided in the bottom plate portion of the eaves gutter. [Explanation of symbols]

[0059] 1,101,201,301,401,501 Rainwater drainage structure, 5,105,205 Upstream downpipe, 5a lower end, 5b,105b,205b lower end, 5c insertion, 10 eave gutter, 14 bottom plate, 14a,14b through hole, 15 Eaves gutter main body, 19 bottom surface, 20,320,420,520 vertical pipe, 22 first vertical pipe, 25,425 branch pipe, 26 connecting pipe, 28,428,528 branch pipe (merging part), 28a,428a main pipe section, 28b branch pipe section, 29 bottom wall lower surface, 30 second vertical pipe, 50 standing wall, 50a through hole, 55 above ground, 70,470,570 Downstream downspout, 72 Drop outlet, 74 Downspout joint, 78 Elbow, 80 Call pipe, 320a Upper end, 320b Upper end, 435,535 Enlarged diameter portion, 490,590 Wall portion.

Claims

1. A rainwater drainage structure installed in a building having a roof to drain rainwater, An eaves gutter attached to the eaves of the eaves and having a through hole and a drop opening; An upstream downspout that drains rainwater from a roof above the shed; a downstream downspout having a vertical pipe vertically installed below the through hole and a branch pipe for causing water from the downspout to flow downward, and for causing the rainwater from the upstream downspout and the rainwater from the downspout to join and flow down; The vertical pipe has a confluence portion to which one end of the branch pipe is connected, whereby rainwater from the upstream downspout and rainwater from the branch pipe are joined together, the confluence portion having a larger diameter than the upstream downspout, A rainwater drainage structure, in which at least a portion of the upstream downspout is loosely fitted within the through hole in a state capable of moving relative to the through hole.

2. The eaves gutter has a cylindrical portion extending in a height direction of the eaves gutter, The through hole is provided in the cylindrical portion. The rainwater drainage structure according to claim 1.

3. The upper end of the vertical pipe is connected and fixed to the lower end of the cylindrical portion. The rainwater drainage structure according to claim 2.

4. The upper end of the vertical pipe is located above the lower end of the cylindrical portion. A rainwater drainage structure according to claim 2 or 3.

5. The upper end of the vertical pipe is in contact with the lower surface of the bottom wall of the eaves gutter. A rainwater drainage structure according to claim 1, 2 or 4.

6. The rainwater drainage structure according to claim 1 , wherein the upstream downspout includes an insertion portion that is inserted into the confluence portion.

7. The inner diameter of the upper end of the vertical pipe is smaller than the maximum inner diameter of the junction, The diameter center of the upper end of the vertical pipe is eccentric with respect to the diameter center of the maximum inner diameter part of the confluence part so that the projection dimension of the upper end of the vertical pipe from the wall part of the building and the projection dimension of the confluence part from the wall part of the building are approximately equal to each other. A rainwater drainage structure according to any one of claims 1 to 6.

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