Component element for drainage member and rain gutter, rain gutter, building, assembly method of rain gutter, elbow, eaves gutter

Abstract

To provide a component for a drainage member capable of exhibiting an excellent siphon characteristic in a simple structure and reduced cost with good workability.SOLUTION: A drainage member comprises a lid member 21 placed inside of an eaves gutter 10 at a position apart from a bottom surface 10a in an upper direction and forming an inlet 2A flowing rain water in the eaves gutter 10 into a drainage opening between the bottom surface 10a ant itself. The lid member 21 is arranged to seal an opening of a drainage opening 20 view from a vertical direction, a projected area of the lid member 21 on a surface orthogonal to the vertical direction is set so as to be larger than a projected area of the opening of the drainage opening 20, and the lid member is arranged at a height H of 10 to 50 mm above the bottom surface 10a.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a drainage member and a rain gutter. [Background technology]

[0002] Conventionally, a gutter system has been in place to collect rainwater running down from the eaves of a roof and drain it downward. The system typically consists of a gutter attached to the eaves of the roof of a house, a main gutter or downspout connected to the gutter by a downspout joint, and then hung down along the exterior wall to a drainage pipe buried underground. On the other hand, this type of gutter system is required to increase the amount of drainage per unit time without damaging the appearance of the house, so that rainwater can be discharged into the drainage pipes appropriately even during heavy rain. Therefore, in order to increase the flow rate of water that can be treated by the eaves gutter, it is necessary to increase the cross-sectional dimensions of the eaves gutter itself, enlarge the diameter of the main gutter and downspout, and increase the number of them. However, these have problems such as increased costs and a poor appearance.

[0003] Thus, as a gutter device that increases the amount of drainage treatment without increasing the diameter or number of drains, a siphon-type drainage device that can drain large amounts of rainwater extremely efficiently by siphon action during heavy rain by setting the opening areas of the downspout and the lower gutter to appropriate dimensions, as described in Patent Document 1, for example, is known. The drainage device in Patent Document 1 is configured to stabilize drainage by siphon action by attaching a vortex prevention member to the upper end of the siphon pipe on the underside of the eaves gutter and eliminating the intake of air by vortex flow. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-308399 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional siphon-type drainage device shown in the above-mentioned Patent Document 1, the vortex prevention member (drainage member) is attached to the upper end of the siphon pipe, but the installation must be done by inserting one's hand near the bottom of the eaves gutter, which poses problems in terms of workability. Also, because the vortex prevention member is shaped to fit the inner surface of the downpipe, for example, when foreign matter that has flowed in from the eaves gutter clogs the vortex prevention member, it is difficult to remove, and the work requires time and effort, so there is room for improvement in this regard. In addition, the opening area of ​​the downspout is 20 cm 2 Because the volume of the drainage pipe was small (less than 100 mm), the maximum drainage flow rate was insufficient even when using the siphon effect. Furthermore, since it is necessary to prepare drainage components that are suitable for each diameter of the downspout, there are issues from the standpoint of economy, and there was a demand for optimal siphon performance that can be easily adjusted on-site to suit the size of the eaves gutter or downspout.

[0006] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a drainage member that can reduce costs, has a simple structure with excellent workability, and exhibits excellent siphon performance. [Means for solving the problem]

[0007] In order to achieve the above object, the drainage member of the present invention is a drainage member provided in a gutter having an eaves gutter and a vertical gutter connected to a drop opening forming an opening on the bottom side of the eaves gutter, the drainage member comprising: a tubular portion forming the drop opening, a plate-shaped flange portion extending radially outward from the upper end of the tubular portion, and a plurality of vertical ribs provided on the flange portion; and a mounting tube having a lid member that is installed inside the eaves gutter at a position spaced upward from the bottom surface and that forms an inlet opening between the lid member and the bottom surface for allowing rainwater in the eaves gutter to flow into the drop opening, the connection portion between the tubular portion and the flange portion is formed into a tapered surface or a curved surface, the lower surface of the outer circumferential side of the flange portion is provided with a step portion that is engaged with the bottom surface of the eaves gutter, the lid member is disposed above the drop opening, an induction guide is formed on the lower surface of the lid member, the height H of the lid member from the bottom surface is 10 mm or more and 50 mm or less, and the opening area of ​​the drop opening is 30 cm 2 over 190cm 2 the ratio R1 / H of the opening outer diameter R1 of the drop hole portion to the height H of the lid member is 1.5 to 5.5, and the lid diameter R2 of the lid member is larger than the opening outer diameter R1 and is 245% or less of the opening outer diameter R1. The cover diameter R2 may be 195% or less of the opening outer diameter R1. The induction guide may be cone-shaped. The gutter may also comprise an eaves gutter, the drainage member installed on the bottom surface of the eaves gutter, a downspout joint connected to the mounting tube protruding downward from the bottom of the eaves gutter, a first elbow connected to the downspout joint, a main gutter connected to the downspout joint via the first elbow, a second elbow connected to the main gutter, and a downspout connected to the main gutter via the second elbow, wherein the length of the downspout is 2.0 m or more. The first elbow and the second elbow may also have receiving ports provided at both ends of the curved pipe portion, and the radius of curvature of the inner wall surface on the inner side of the curved pipe portion when viewed in a cross section including the pipe axis of the first and second elbows may be at least greater than 64 mm and less than 125 mm. The length of the call pipe may be 0 m or more and 2.0 m or less. In addition, the drainage member of the present invention is a drainage member provided in a gutter that has an eaves gutter and a downspout connected to a drop outlet portion that forms an opening on the bottom side of the eaves gutter, and has a lid member that is installed inside the eaves gutter at a position spaced above the bottom surface and forms an inflow opening between the lid member and the bottom surface for allowing rainwater in the eaves gutter to flow into the drop outlet, the lid member is positioned so as to close the opening of the drop outlet portion when viewed from above in the vertical direction, the projected area of ​​the lid member on a plane perpendicular to the vertical direction is set to be larger than the projected area of ​​the opening of the drop outlet portion, the lid member is provided at a height of 10 to 50 mm above the bottom surface, and the area of ​​the inflow opening is larger than the opening area of ​​the drop outlet portion.

[0008] In the present invention, by closing the opening of the downspout when viewed from above in the vertical direction and setting the position of the cover member so that it is 10 to 50 mm above the bottom surface of the eaves gutter, the downspout becomes full and water-sealed without sucking in air even when a large amount of rainwater flows in from the inlet opening during heavy rain. Therefore, a siphon phenomenon can be generated in the downspout, and clogging with foreign objects such as fallen leaves can be prevented, resulting in excellent siphon performance. In other words, if the height of the cover member from the bottom of the eaves gutter is less than 10 mm, foreign objects such as fallen leaves will easily clog the inlet opening, and the inlet opening area will be small, making it impossible to ensure the desired drainage flow rate. Also, if the height of the cover member from the bottom of the eaves gutter exceeds 50 mm, the rainwater level required for siphoning will rise too high, making it easier for air to be sucked in, making it difficult for siphoning to occur, and reducing drainage performance. Therefore, it is preferable to set the height of the cover member as described above in the range of 10 to 50 mm.

[0009] In addition, in the present invention, the cover member, whose projected area is larger than the projected area of ​​the opening of the drop-off portion, is set at a position of a predetermined height from the bottom surface of the eaves gutter. Therefore, the cover member is attached from the top side of the eaves gutter, which reduces the work on the bottom side of the eaves gutter and reduces the effort and time required for attaching and removing the cover member. Moreover, the siphon performance can be adjusted by changing the height of the cover member from the bottom surface according to the shape of the eaves gutter (bottom width) and the opening area of ​​the drop-off portion, so that the variation of the cover member can be kept to a minimum, and costs can be reduced.

[0010] In addition, in the drainage member according to the present invention, it is preferable that the lid diameter or minimum width dimension of the lid member is larger than the outer diameter of the opening of the drop hole portion and is 245% or less of the outer diameter of the opening.

[0011] In this case, the flow of rainwater flowing in from the inlet opening formed on the underside of the lid member becomes more stable, the water level in the eaves gutter also becomes stable, and a siphon can be reliably generated, improving the drainage performance. In particular, if the lid diameter or minimum width dimension of the lid member exceeds 245% of the opening outer diameter of the drop-out part, a phenomenon occurs in which much of the rainwater attempting to flow into the inlet opening collides with the lid member, causing the water level to rise. For this reason, it is preferable that the lid diameter or minimum width dimension of the lid member as described above is larger than the opening outer diameter of the drop-out part and is in the range of 245% or less of the opening outer diameter.

[0012] In the drainage member according to the present invention, it is more preferable that the height of the lid member is 30 to 40 mm above the bottom surface.

[0013] In this case, by setting the height of the cover member to a position in the range of 30 to 40 mm above the bottom surface, the flow of rainwater flowing in through the inlet opening formed on the underside of the cover member becomes more stable, the water level in the eaves gutter becomes stable, and a siphon can be generated reliably, thereby improving drainage performance.

[0014] Moreover, in the drainage member according to the present invention, it is more preferable that the lid diameter or minimum width dimension of the lid member is 150 to 200% of the opening outer diameter of the drop hole portion.

[0015] In this case, by setting the lid diameter or minimum width dimension of the lid member in the range of 150 to 200% of the outer diameter of the opening of the drop portion, the flow of rainwater flowing in from the inlet opening formed on the underside of the lid member becomes more stable, the water level in the eaves gutter becomes stable, and a siphon can be generated reliably, thereby improving drainage performance.

[0016] In addition, it is preferable that the drainage member of the present invention comprises a cover member formed in a plate shape, a mounting tube having the drop-out portion and fitted into the downspout, and vertical ribs connecting the cover member and the mounting tube and arranged at intervals circumferentially at positions not overlapping with the opening of the drop-out portion when viewed from above in the vertical direction, and the inflow opening is formed between the cover member and the mounting tube.

[0017] In this case, the cover member can be placed in a predetermined position by fitting the mounting tube, which is integrally provided with the cover member via the vertical rib, to the downspout, and an inlet opening of a suitable size is formed between the underside of the cover member and the bottom surface of the eaves gutter, making it easy to install the drainage member. Moreover, in the drainage member according to the present invention, a vertical rib is provided at the inlet opening portion for allowing rainwater to flow into the downspout, so that the vertical rib can have a straightening effect and can more reliably prevent rainwater from sucking in air.

[0018] In addition, the drainage member of the present invention is preferably configured so that an induction guide is formed on the underside of the lid member, the induction guide having a curved portion that extends gradually downward toward the center of the lid in a planar view, and the induction guide is configured to guide rainwater flowing in from the inlet opening to the curved portion and toward the drop opening.

[0019] In this case, the rainwater flowing in from the inlet opening is guided to the curved portion of the guide and directed toward the outlet, thereby more reliably preventing the rainwater from sucking in air. Effect of the Invention

[0020] According to the drainage member of the present invention, it is possible to reduce costs, have a simple structure with excellent workability, and exhibit excellent siphon performance. [Brief description of the drawings]

[0021] [Figure 1] 1 is a diagram showing a schematic configuration of a rain gutter equipped with a siphon drain member according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram illustrating in further detail the schematic configuration of the rain gutter shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the elbow shown in FIG. 2. [Figure 4] 1 is a perspective view showing a siphon drain member installed in an eaves gutter, viewed obliquely from above. FIG. [Diagram 5] FIG. 2 is a partially cutaway perspective view showing the configuration of a siphon drain member. [Figure 6] 5 is a view of the siphon drain member shown in FIG. 4 as viewed from the longitudinal direction of the eaves gutter. [Figure 7] 7 is a diagram showing a state before the siphon drain member shown in FIG. 6 is attached to an eaves gutter. FIG. [Figure 8] 7 is a plan view of the siphon drain member installed in the eaves gutter shown in FIG. 6, viewed from above. [Figure 9] 5(a), (b), and (c) are cross-sectional views for explaining the siphon performance at the position of the cover member of the siphon drain member. [Figure 10] FIG. 2 is a side view of the experimental apparatus according to the first embodiment. [Figure 11] 13 is a graph showing experimental results according to the second embodiment. [Figure 12] FIG. 5 is a perspective view showing a state in which a siphon drain member is attached inside a funnel according to a first modified example, as viewed obliquely from above, and corresponds to FIG. 4. [Figure 13] 13 is a cross-sectional view taken along line BB in FIG. 12. [Figure 14] FIG. 14 is a diagram showing the state before the siphon drain member shown in FIG. 13 is attached to an eaves gutter. [Figure 15] FIG. 11 is a partially cutaway perspective view showing the configuration of a cover member according to a second modified example, viewed obliquely from below. [Figure 16] FIG. 11 is a partially cutaway perspective view showing the configuration of a cover member according to a second modified example, viewed obliquely from above. [Figure 17] FIG. 11 is a side view of a cover member according to a second modified example attached to an eaves gutter. [Figure 18] 7 is a diagram showing the state before the cover member shown in FIG. 6 is attached to the eaves gutter. FIG. [Figure 19] FIG. 13 is a perspective view showing the configuration of a cover member according to a third modified example. [Figure 20] 20 is an exploded perspective view of the cover member shown in FIG. 19. FIG. [Figure 21] FIG. 13 is a side view of a cover member according to a fourth modified example attached to an eaves gutter. [Figure 22] FIG. 13 is a cross-sectional view showing a state in which a lid member is placed on a funnel according to a fifth modified example. [Figure 23] FIG. 13 is a cross-sectional view showing a state in which a lid member is placed on a funnel according to a sixth modified example. [Figure 24] FIG. 13 is a cross-sectional view showing a state in which a lid member is placed on a funnel according to a seventh modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a drainage member according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0023] As shown in FIG. 1, the siphon drain member 2 (drainage member) of this embodiment has a high drainage function and is provided inside a large eaves gutter 10 that is placed on the eaves of a rain gutter 1 attached to a building of a large facility such as a factory or shopping center.

[0024] As shown in FIG. 1, the gutter 1 has the above-mentioned eaves gutter 10 and a vertical gutter 11 connected to a circular through hole 10b formed in the bottom surface 10a of the eaves gutter 10 via a call gutter 12. The call gutter 12 horizontally guides rainwater W flowing down from the siphon drain member 2 provided in the eaves gutter 10, and one end side is connected to the lower surface 10c of the eaves gutter 10 via a vertical gutter joint 13 by a first elbow 12A, and the other end side is connected to the upper end of the vertical gutter 11 by a second elbow 12B. In such a gutter 1, the vertical gutter 11 is arranged in the vertical direction along the outer wall P of the building, and the lower end of the vertical gutter 11 is connected to a drain pipe (not shown) buried in the ground, and rainwater flowing down from the eaves of the roof is received by the eaves gutter 10 and overflows to the upper side, and is discharged to the drain pipe side via the call gutter 12 and the vertical gutter 11. 1 and 4, the right side of the paper surface is the building side. In addition, in the rain gutter 1, the building side is referred to as the rear or rear side, and the side away from the building is referred to as the front or front side.

[0025] The eaves gutter 10 is an extrusion molded product of synthetic resin such as rigid polyvinyl chloride resin, ABS, or AES, and is formed with a groove-shaped cross section with a front wall 15 erected from the front end of a flat bottom wall 14 and a rear wall 16 erected from the rear end of the bottom wall 14. The eaves gutter 10 is suspended by a gutter hanger (not shown) attached to a fascia board (not shown) to receive rainwater that flows down from the eaves of the roof. In order to prevent expansion and contraction due to heat, the linear expansion coefficient of the eaves gutter 10 is 2.0×10 -5 / °C or less, and the linear expansion coefficient can be reduced by inserting a low-elasticity sheet such as a stretched PET resin sheet or an iron sheet into the center of the thickness direction of the eaves gutter 10, or by blending a low-elasticity additive such as wollastonite or carbon fiber into the synthetic resin itself that constitutes the eaves gutter 10. Note that the material is not limited to synthetic resin, and an extrusion molded metal product may also be used. The eaves gutter 10 has a bottom width of 100 mm or more and 200 mm or less, and a height of 90 mm or more and 150 mm or less, and is applicable to a large-diameter downspout that can carry rainwater at a flow rate of, for example, 4 liters / sec or more and 20 liters / sec or less.

[0026] The first elbow 12A is a joint installed on the downstream side of the siphon drain member 2. As shown in Fig. 2, a first receiving port (one end) 60A of the first elbow 12A is connected to the water collection port 6 on the downstream side (i.e., the side where rainwater collects) of the eaves gutter 10 on which the siphon drain member 2 is installed.

[0027] 3, the first elbow 12A includes a curved pipe portion 121 and sockets 60A, 60B provided at both ends of the curved pipe portion 121. The curved pipe portion 121 is bent at approximately 90° in a side view.

[0028] When viewed in a cross section (plan, the paper surface of FIG. 3) including the pipe axis 6C of the curved pipe portion 121, the radius of curvature r1 of the inner wall surface 122 on the inner periphery side of the curved pipe portion 121 and the radius of curvature r2 of the outer wall surface 123 are at least greater than 64 mm and smaller than 125 mm. In order to prevent a decrease in the flow rate of the rainwater W flowing in from the first receiving port 60A and to allow the rainwater W to flow more smoothly, the radii of curvature r1, r2 are preferably greater than 64 mm and smaller than 90 mm in terms of storage and transportation, and are preferably greater than 80 mm and smaller than 100 mm in terms of drainage performance.

[0029] As shown in FIG. 2, the upstream end 12a of the call pipe 12 is connected to the second receiving port 60B of the first elbow 12A. The call pipe 12 is a member that horizontally draws rainwater W that has flowed down the first elbow 12A, and is a straight pipe that extends along the front-rear direction D2, or extends so that the distance from the front-rear direction D2 increases as it advances downstream. The length from the upstream end 12a to the downstream end 12b of the call pipe 12 (call pipe length F1) is greater than 0 m and less than 2.0 m, preferably greater than 0.6 m and less than 1.5 m, and more preferably greater than 0.6 m and less than 1.0 m. By having the call pipe length F1 within the above-mentioned range, rainwater that flows down from the first elbow 12A flows down smoothly in a full water state.

[0030] A first socket 60A of a second elbow 12B is connected to the downstream end 12b of the outlet pipe 12. The second elbow 12B has the same configuration as the first elbow 12A.

[0031] The upper end 11a of the downspout 11 is connected to the second receiving port 60B of the second elbow 12B. The downspout 11 is a member that vertically draws rainwater W that has flowed down the second elbow 12B, and is a straight pipe extending in the up-down direction D3 (the vertical direction and the reverse direction). The lower end 11b of the downspout 11 is connected to the ground G, and is connected to a well-known water collection basin 80 buried in the ground. The water collection basin 80 is connected to a drainage structure such as a sewer pipe 82 via a connecting pipe 81. The water collection basin 80 has a width greater than that of the downspout 11.

[0032] The length from the upper end 11a to the lower end 11b of the downspout 11 (downspout length F2) is 2.0 m or more, preferably 3.0 m or more, and more preferably 4.0 m or more. By keeping the downspout length F2 within the above range, the siphoning phenomenon in the downspout 11 is satisfactorily generated and maintained. When the downspout length F2 is longer, the amount of rainwater W flowing down the lower end 11b increases, and the rainwater W flows into the water collection basin 80 with force.

[0033] The siphon drain member 2 shown in Fig. 4 is a drainage member having a high drainage function for improving the drainage capacity of rainwater W (see Fig. 1) that flows into the eaves gutter 10 during heavy rain. As shown in Figs. 5 to 7, the siphon drain member 2 includes a plate-shaped cover member 21, an attachment tube 22 having a drop opening 20 and fitted to the downpipe 11 (more precisely, the lower downpipe 12 above the downpipe 11), and a plurality of vertical ribs 23 that connect the cover member 21 and the attachment tube 22 and are arranged at intervals in the circumferential direction at positions that do not overlap the drop opening 20 in a top view. In this embodiment, the siphon drain member 2 is an injection molded product made of synthetic resin such as hard polyvinyl chloride resin, polycarbonate, ABS, AES, etc. Note that the material is not limited to synthetic resin, and it may be made of cast iron using a mold.

[0034] In this embodiment, the cover member 21 is formed in a disk shape, the mounting cylinder 22 is formed in a cylindrical shape, and their respective central axes are disposed on a common axis and coincide with the vertical direction. Hereinafter, this common axis will be referred to as the drain axis O, and the mounting cylinder 22 side of the siphon drain member 2 along the drain axis O direction will be referred to as the lower side, and the cover member 21 side will be referred to as the upper side. In a plan view of the siphon drain member 2 seen from the drain axis O direction, the direction perpendicular to the drain axis O will be referred to as the radial direction, and the direction going around the drain axis O will be referred to as the circumferential direction.

[0035] The mounting tube 22 has a tube portion 22A that forms the drop opening portion 20, and a plate-shaped flange portion 22B that extends radially outward from the upper end of the tube portion 22A. Here, the opening outer diameter R1 of the drop opening portion 20 corresponds to the inner diameter of the tube portion 22A, and the opening area A1 of the drop opening portion 20 corresponds to the area whose diameter is the inner diameter of the tube portion 22A (the opening outer diameter R1 of the drop opening portion 20). In this embodiment, the opening area A1 is 20 cm 2 More than 300cm 2 Less than 30cm 2 over 190cm 2 Less than 40cm is preferable 2 More than 100cm 2 The following is more preferred: In this embodiment, the drain axis O, which corresponds to the central axis of the siphon drain member 2, coincides with the vertical direction, so that the lid area A2 of the lid member 21 and the opening area A1 of the drop mouth portion 20 correspond to the projected area of ​​the lid member 21 and the projected area of ​​the opening of the drop mouth portion 20, respectively, relative to a plane perpendicular to the vertical direction.

[0036] In the mounting tube 22, the inner connection part 22a where the tube part 22A corresponding to the drop opening part 20 and the flange part 22B are connected has a tapered surface or a curved surface to form a bell-mouth shape. If the inner connection part 22a has a curved surface, the radius of curvature of the cross section in the direction parallel to the drain axis O is preferably 5 mm to 20 mm. The tubular portion 22A is inserted into the through hole 10b (see FIG. 7) of the eaves gutter 10 from above, and is disposed in a state of being inserted inside the downspout joint 13. A male thread (not shown) may be formed on the outer circumferential surface of the tubular portion 22A. In this case, the attachment tube 22 can be attached by rotating the attachment tube 22 to screw the male thread of the tubular portion 22A into a female thread (not shown) formed on the inner surface of the downspout joint 13 and tightening it.

[0037] The flange portion 22B has a step portion 22b formed by cutting out a thin portion around the entire circumference on the lower surface of the outer periphery, and this step portion 22b is engaged on the bottom wall 14 (bottom surface 10a) of the eaves gutter 10. In this embodiment, the flange portion 22B and the cover member 21 have approximately the same outer diameter. The portion formed between the outer peripheral edge 21a of the cover member 21 and the outer peripheral edge 22c of the flange portion 22B becomes the inflow opening 2A through which the rainwater W accumulated in the eaves gutter 10 flows into the opening of the drop port portion 20. Note that the inflow opening 2A refers to the portion between the outer peripheral edge 21a of the cover member 21 and the bottom surface 10a of the eaves gutter 10, or between the flange portion 22B of the mounting tube 22 in the direction perpendicular to the horizontal plane. For example, if the outer peripheral edge 21a of the cover member 21 is larger than the outer peripheral edge 22c of the flange portion 22B of the mounting tube 22, the inflow opening 2A is the portion formed between the outer peripheral edge 21a of the cover member 21 and the bottom surface 10a of the eaves gutter 10, and if the outer peripheral edge 21a of the cover member 21 is smaller than the outer peripheral edge 22c of the flange portion 22B of the mounting tube 22, the inflow opening 2A is the portion formed between the outer peripheral edge 21a of the cover member 21 and the upper surface 22d of the flange portion 22B of the mounting tube 22. The size, height, and shape of the lid member 21 described later are adjusted so that the area of ​​the inflow opening 2A is larger than the opening area A1 of the above-mentioned drop opening portion 20. In this embodiment, the area of ​​the inflow opening 2A can be calculated by multiplying the circumference of the circular lid member 21, i.e., the length of the outer circumferential edge 21a, by the height H of the lid member 21 described later.

[0038] As shown in Fig. 5, the vertical ribs 23 connect the upper surface 22d of the flange 22B of the mounting tube 22 to the outer periphery of the lower surface 21c of the cover member 21. That is, the cover member 21 is supported from below by the vertical ribs 23, 23, ... and is held at a position that ensures a predetermined height H from the bottom surface 10a of the eaves gutter 10. These vertical ribs 23 are provided at the inlet opening 2A and are formed to cross the radial direction and curve in a plan view. That is, the vertical ribs 23 have the function of rectifying the rainwater W that flows from the inlet opening 2A into the drop mouth portion 20.

[0039] As described above, the lid member 21 is supported by the mounting tube 22 while being supported from below by the multiple vertical ribs 23, 23, .... The lid member 21 is disposed inside the eaves gutter 10 as described above, and is installed at a position spaced upward from the drop opening 20, and forms an inflow opening 2A in the bottom surface 10a of the eaves gutter 10 below the lid member 21, through which rainwater W flows into the drop opening 20.

[0040] Lid member 21 is disposed so as to close the opening of drop mouth portion 20 when viewed from above in the vertical direction, and a lid area A2 shown in FIG. 8 is set to be larger than the opening area A1 of drop mouth portion 20 (see FIG. 5). In this embodiment, the center of the lid member 21 and the center of the opening of the drop mouth portion 20 coincide in the vertical direction, but if the eaves gutter 10 itself is tilted and both the lid member 21 and the drop mouth portion 20 are tilted, then if the lid area A2 is set to the same area as the opening area A1 of the drop mouth portion 20, the opening of the drop mouth portion 20 cannot be blocked when viewed from the vertical direction, and a gap through which air enters (an air core due to a vortex) will be generated between the lid member 21 and the drop mouth portion 20. For this reason, it is preferable that the projected area of ​​the lid member 21 on a plane perpendicular to the vertical direction is set to be larger than the projected area of ​​the opening of the drop mouth portion 20.

[0041] The lid member 21 is set at a height H of 10 to 50 mm upward from the bottom surface 10a of the eaves gutter 10. The lid member 21 is preferably set to have a lid diameter R2 larger than the opening outer diameter R1 of the drop-off portion 20 and equal to or less than 245% of the opening outer diameter R1. This means that when the opening outer diameter R1 is 75 mm, if the lid diameter R2 is 185 mm or less (i.e., 185 mm / 75 mm ≒ 245%), a good water level can be maintained in the eaves gutter 10. If the lid diameter R2 of the lid member 21 exceeds 245% of the opening outer diameter R1 of the drop-off portion 20, a phenomenon occurs in which much of the rainwater attempting to flow into the inlet opening collides with the lid member, causing the water level to rise. For example, when the opening outer diameter R1 of the drop opening portion 20 is 75 mm, the lid diameter R2 of the lid member 21 may be greater than 75 mm and equal to or smaller than 185 mm. It should be noted that even if the height of the cover member 21 is not constant due to inclination, etc., it is sufficient that the height H is within the range of 10 to 50 mm.

[0042] Furthermore, it is more preferable that the height H of the lid member 21 is set at a position 30 to 40 mm above the bottom surface 10a of the eaves gutter 10, and the lid diameter R2 is set at 150 to 200% of the opening outer diameter R1 of the drop opening portion 20. If the lid diameter R2 is smaller than 150% of the opening outer diameter R1 of the drop opening portion 20, the water level in the eaves gutter 10 will be lower than the lid member 21, and there is a risk that the lid member 21 will not come into contact with the inflowing water. If it exceeds 200%, the proportion of the water flowing in from the inlet opening that collides with the lid member 21 will increase, and the water level in the eaves gutter 10 will become too high above the lid member 21, which may reduce siphon performance. Furthermore, by setting the distance to 150% or more, even if the entire eaves gutter 10 is tilted forward or backward, the opening of the drop opening 20 can be reliably closed. By setting the distance to 200% or less, the fit becomes smaller, and it is possible to prevent the joints and supports from becoming larger.

[0043] For the siphon action to occur, the water level in the eaves gutter 10 must be higher than the inlet opening 2A, and therefore the height H of the cover member 21 must be lower than the maximum water level in the eaves gutter 10. For a stable siphon action to occur, the height H of the cover member 21 is preferably 0.1 to 0.5 times the maximum water level in the eaves gutter 10, and more preferably 0.2 to 0.45 times the height. The maximum water level in the eaves gutter 10 refers to the height of either the front wall 15 or the rear wall 16 of the eaves gutter, whichever is lower in height from the bottom surface 14. If the height of the lid member 21 is not constant because it is tilted, for example, the maximum height of the height H of the lid member 21 may be set to 0.1 to 0.5 times the maximum water level in the eaves gutter 10.

[0044] Moreover, the opening outer diameter R1 of the drop opening portion 20 suitable for providing the cover member 21 set at the position described above is preferably 50 mm or more and 170 mm or less. That is, by setting the opening outer diameter R1 of the drop opening portion 20 to the lower limit of 50 mm or more, a large amount of wastewater generated in the siphon generation portion (siphon drain member 2) can be smoothly drained. By setting it to the upper limit of 170 mm or less, the fit becomes small, and it is possible to prevent the joints and supports from becoming large.

[0045] As shown in Figs. 5 and 8, the cover member 21 is provided with gripping ribs 24 that protrude upward from the upper surface 21b and are spaced apart in the circumferential direction. By gripping the gripping ribs 24, the siphon drain member 2 can be easily rotated when tightening it. The gripping rib 24 is composed of a rib body 24A extending in the circumferential direction and an extension portion 24B protruding from both ends of the rib body 24A toward the outer periphery. For example, when attaching the siphon drain member 2 to the downspout joint 13, a rod-shaped member can be engaged between the gripping ribs 24, 24 that are adjacent in the circumferential direction, and the rod-shaped member can be rotated to tighten it. In addition, a gap is formed between the gripping ribs 24, 24, so that debris such as fallen leaves in the eaves gutter 10 can easily pass through and it is possible to prevent entanglement.

[0046] 5 to 7, the cover member 21 is provided with a plurality of guides 25, each having a curved line that gradually extends downward toward the drain axis O (the cover center) at the center of the lower surface 21c in a plan view, which extend radially from the drain axis O. The guides 25 are for guiding the rainwater W in the eaves gutter 10 from the inlet opening 2A to the drop opening (the opening of the drop opening portion 20).

[0047] Next, a procedure for assembling the rain gutter 1 (the eaves gutter 10, the downspout 11, and the siphon drain member 2) having the above-mentioned siphon drain member 2 will be specifically described. First, as shown in Fig. 7, a through hole 10b is opened at a position where the siphon drain member 2 is to be attached to the bottom wall 14 of the eaves gutter 10. Next, the siphon drain member 2 is inserted into the eaves gutter 10, and the tube portion 22A of the mounting tube 22 is inserted through the through hole 10b of the eaves gutter 10 so that it protrudes downward, and the step portion 22b of the flange portion 22B of the mounting tube 22 is engaged and fixed to the periphery of the through hole 10b in the bottom surface 10a of the eaves gutter 10 with a packing or the like interposed therebetween. As a result, the siphon drain member 2 is placed at a predetermined position in the eaves gutter 10, and the cover member 21 is also fixed in a state where it is held at a predetermined height H relative to the drop opening portion 20, as shown in Fig. 6.

[0048] Next, a downspout joint 13 is connected to the tubular portion 22A protruding downward from the through hole 10b of the eaves gutter 10, and then the main gutter 12 is attached using the first elbow 12A and the second elbow 12B as shown in Fig. 1, and then the downspout 11 is connected to the second elbow 12B at one end of the main gutter 12. The downspouts 11 are connected using joints in an appropriate number according to the distance to the drainage pipe buried underground as described above.

[0049] In the gutter 1 assembled in this manner, rain that falls on the roof flows into the siphon drain member 2 provided in the eaves gutter 10 from the inlet opening 2A, passes through the drop opening 20, flows down the downpipe 12, and flows down into the downpipe 11. The rainwater W that flows from the downpipe 12 into the downpipe 11 flows down into a drain pipe (not shown) buried underground. At this time, the downstream side of the siphon drain member 2 of the downpipe 11 is filled with water and is sealed with water, so the downpipe 11 flows down while being filled with water, causing a siphon phenomenon in the drop opening 20, the downpipe 12, and the downpipe 11, and the rainwater is forcefully drained from the downpipe 11 to the drain pipe.

[0050] As described above, the procedure for assembling the rain gutter 1 in this embodiment is one example of first fixing the siphon drain member 2 to a predetermined position on the eaves gutter 10 and then installing the downpipe 12 and the downpipe 11. It is also possible to assemble the rain gutter 1 using other procedures, such as first assembling the downpipe 11 and the downpipe 12, and then attaching the siphon drain member 2 to the downpipe fitting 13 connected to the downpipe 12.

[0051] Next, the operation of the above-mentioned siphon drain member 2 will be described in detail with reference to the drawings. In this embodiment, as shown in Fig. 5, the opening of the drop port 20 is blocked when viewed from above in the vertical direction, and as shown in Fig. 9(a), the position of the cover member 21 of the siphon drain member 2 is set so that it is 10 to 50 mm above the bottom surface 10a of the eaves gutter 10, so that the downspout 11 is filled with water and sealed without sucking in air even when a large amount of rainwater flows in from the inlet opening during heavy rain. Therefore, the siphon phenomenon can be generated in the downspout 11, and clogging with foreign objects such as fallen leaves can be prevented, resulting in excellent siphon performance.

[0052] That is, if the height H of the cover member 21 from the bottom surface 10a of the eaves gutter 10 is less than 10 mm, foreign objects such as fallen leaves are likely to clog the inlet opening 2A, and the area of ​​the inlet opening 2A is small, so that the desired drainage flow rate cannot be ensured, as shown in FIG. 9(c). Also, if the height H of the cover member 21 from the bottom surface 10a of the eaves gutter 10 exceeds 50 mm, as shown in FIG. 9(b), the water level of the rainwater W required for siphoning rises too high, and air is likely to be sucked in, making it difficult for the siphon to occur, and the drainage performance is reduced. Therefore, it is preferable to set the height of the cover member 21 as described above in the range of 10 to 50 mm, and more preferably in the range of 30 to 40 mm. Here, the relationship between the height H of the lid member 21 and the diameter (opening outer diameter R1) of the drop spout portion 20 is preferably R1 / H=1.0 to 16.0, more preferably 1.3 to 8.0, and most preferably 1.5 to 5.5. By keeping it in this range, a siphon can be generated reliably.

[0053] 5, the present embodiment is configured such that the lid member 21, having a lid area A2 (see FIG. 8) larger than the opening area A1 of the drop opening portion 20, is set at a position of a predetermined height H from the bottom surface 10a of the eaves gutter 10. Therefore, the lid member 21 is attached from above the eaves gutter 10, which reduces the amount of work to be done on the underside 10c (see FIG. 1) of the eaves gutter 10 and reduces the effort and time required for attaching and removing the lid member 21. Furthermore, the siphon performance can be adjusted by changing the height H of the cover member 21 from the bottom surface 10a in accordance with the shape (bottom width) of the eaves gutter 10 and the opening area A1 of the drop-off portion 20, so that the variations in the cover member 21 can be kept to a minimum, thereby reducing costs.

[0054] In addition, by setting the lid diameter R2 of the lid member 21 to be larger than the opening outer diameter R1 of the drop-out portion 20 and within a range of 245% or less of the opening outer diameter R1 as in the present embodiment, the flow of rainwater W flowing in from the inlet opening 2A formed on the lower surface 21c side of the lid member 21 becomes more stable, the water level in the eaves gutter 10 also becomes stable, and a siphon can be reliably generated, thereby improving the drainage performance. In particular, if the lid diameter R2 or the minimum width dimension of the lid member 21 exceeds 245% of the opening outer diameter R1 of the drop-out portion 20, a phenomenon occurs in which most of the rainwater W attempting to flow into the inlet opening 2A collides with the lid member 21, causing the water level to rise. For this reason, it is preferable that the lid diameter R2 of the lid member 21 as described above be larger than the opening outer diameter R1 of the drop-out portion 20 and within a range of 245% or less of the opening outer diameter R1. The minimum outer diameter of lid diameter R2 of lid member 21 may be greater than opening outer diameter R1 of drop opening portion 20, and the outer periphery of lid diameter R2 may be greater than or equal to 245% of the outer periphery of opening outer diameter R1.

[0055] Furthermore, in the siphon drain member 2 of this embodiment, by setting the height H of the cover member 21 to a position in the range of 30 to 40 mm above the bottom surface 10a, the flow of rainwater W flowing in from the inlet opening 2A formed on the underside 21c of the cover member 21 becomes more stable, the water level in the eaves gutter 10 is also stabilized, and a siphon can be generated reliably, thereby improving drainage performance.

[0056] Furthermore, in the siphon drain member 2 of this embodiment, by setting the lid diameter R2 of the lid member 21 in the range of 150 to 200% of the opening outer diameter R1 of the drop portion 20, the flow of rainwater W flowing in from the inlet opening 2A formed on the underside 21c of the lid member 21 becomes more stable, the water level in the eaves gutter 10 is also stabilized, and a siphon can be generated reliably, thereby improving drainage performance.

[0057] In addition, in the siphon drain member 2 of this embodiment, the cover member 21 can be placed in a predetermined position by fitting the mounting tube 22, which is integrally provided with the cover member 21 via the vertical rib 23, into the downspout joint 13 provided on the downspout 11. An inflow opening 2A of a suitable size is formed between the lower surface 21c of the cover member 21 and the bottom surface 10a of the eaves gutter 10, making it easy to install the siphon drain member 2. Moreover, in the siphon drain member 2 of this embodiment, the vertical rib 23 is provided at the inflow opening 2A portion for allowing the rainwater W to flow into the drop opening, so that the vertical rib 23 can have a straightening effect, and the rainwater W can be more reliably prevented from sucking in air.

[0058] Furthermore, in this embodiment, the rainwater W flowing in from the inlet opening 2A is guided to the curved portion of the guide 25 and directed toward the opening of the drop portion 20, thereby more reliably preventing the rainwater W from sucking in air.

[0059] In this manner, in this embodiment, excellent siphon performance can be achieved with a simple structure that is cost-effective and easy to use.

[0060] Next, examples carried out to verify the effects of the drainage member according to the above-described embodiment will be described below.

[0061] (First Example) In the first example, a lid member 21 corresponding to the lid member 21 in the above-described embodiment was used, and an experiment was conducted in which a siphon was generated by changing the height of the lid member 21 from the bottom surface 31a of the eaves gutter 31 and the diameter of the lid member 21, and the drainage condition was confirmed.

[0062] FIG. 10 shows the experimental apparatus used in the first embodiment. The cover member 30 is disk-shaped, and is suspended and supported by a bolt member 33 supported downward from a hanging tool 32 fixed to the ear 31b of the eaves gutter 31 so that the height can be changed. In other words, the height of the cover member 30 suspended and supported by the hanging tool 32 from the bottom surface 31a of the eaves gutter 31 can be changed, and experiments were performed by changing the height to five levels as shown below. In addition, as in the above-mentioned embodiment, the cover member 30 is arranged to close the opening of the drop mouth part 34 inside the downspout joint 36 in all of the experiments in the following 18 cases, and the cover diameter R2 of the cover member 30 is larger than the opening outer diameter R1 (set to 75 mm, 100 mm) of the downspout part 34. In FIG. 10, the downspout is connected to the downstream side of the elbow 35. Table 1 shows the experimental conditions and results when the opening outer diameter R1 in the first embodiment is 75 mm. Table 2 shows the experimental conditions and results when the opening outer diameter R1 in the first embodiment is 100 mm.

[0063] [Table 1]

[0064] [Table 2]

[0065] As shown in Tables 1 and 2, the experiment was carried out for 18 cases (cases 1 to 18) in which the bottom width (mm) of the eaves gutter 31 and the lid diameter (mm) of the lid member 30 were changed. In the case where the opening outer diameter R1 shown in Table 1 is 75 mm, three types of eaves gutters 31 with bottom widths of 120 mm, 150 mm, and 200 mm were used, three cases with a bottom width of 120 mm and lid diameters of 70 mm, 80 mm, and 95 mm, two cases with a bottom width of 150 mm and lid diameters of 110 mm and 125 mm, and five cases with a bottom width of 200 mm and lid diameters of 140 mm, 155 mm, 170 mm, 185 mm, and 195 mm. When the opening outer diameter R1 shown in Table 2 is 100 mm, two types of eaves gutters 31 with bottom widths of 150 mm and 200 mm were used, three cases with a bottom width of 150 mm and lid diameters of 90 mm, 105 mm, and 120 mm, and five cases with a bottom width of 200 mm and lid diameters of 135 mm, 150 mm, 165 mm, 180 mm, and 195 mm. In addition, the right columns of Tables 1 and 2 show the ratio (%) of the lid diameter R2 to the opening outer diameter R1 in each case.

[0066] In the experiments for the above 18 cases, the height H of the eaves gutter 31 of the cover member 30 from the bottom surface 31a was changed in seven steps of 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, and 60mm, and water was allowed to flow into the eaves gutter 31 at a flow rate of 6 liters / sec (equivalent to rainfall of 100mm / h) when the opening outer diameter R1 was 75mm, and water was allowed to flow at a flow rate of 18 liters / sec (equivalent to rainfall of 300mm / h) when the opening outer diameter R1 was 100mm.The water level was measured at a position 150mm from the center of the opening of the drop-out portion 34 in the extension direction of the eaves gutter 31, and the state of the siphon phenomenon was visually confirmed in each experiment. The lower columns in Tables 1 and 2 show the ratio of the opening outer diameter R1 to the height H from the bottom surface 31a of the eaves gutter 31 of each lid member 30 to the height H from the bottom surface of the lid member.

[0067] As shown in Tables 1 and 2, the experimental results confirmed that the siphon phenomenon occurred in all cases 1 to 18 where the height H of the lid member 30 was changed (height position of 5 to 60 mm). It was confirmed that the lid diameter of the lid member 30 at this time was larger than the opening outer diameter (75 mm) of the drop-off portion 34 and was in the range of 185 mm or less (245% or less of the opening outer diameter) in cases 2 to 9 where the opening outer diameter R1 was 75 mm, and was larger than the opening outer diameter (100 mm) of the drop-off portion 34 and was in the range of 195 mm or less (245% or less of the opening outer diameter) in cases 12 to 18 where the opening outer diameter R1 was 100 mm.

[0068] In Tables 1 and 2, it was confirmed that in the area surrounded by the dashed line, the water level was kept low because the balance between the height of the cover member 30 and the cover diameter was good. In particular, in the area surrounded by the thick line, as shown in Figure 9(a), it was confirmed that the water level was kept low and a good siphon effect was achieved because the balance between the water flow into the inlet opening, the height of the cover member 30, and the cover diameter was good. On the other hand, it was confirmed that when the height of the cover member 30 is large (over 40 mm in this experiment) and the cover diameter is small (smaller than 95 mm in this experiment), the water level in the eaves gutter 31 becomes lower than the cover member 30, as shown in Figure 9(b), and siphon action may be less likely to occur. Furthermore, it was confirmed that when the height of the lid member 30 is small (less than 30 mm in this experiment) and the lid diameter is large (greater than 155 mm in this experiment), as shown in Figure 9(c), the water flow flowing in from the inlet opening collides with the lid member 30 at a higher rate, causing the water flow to become turbulent and reducing siphon performance, and that the flow rate may be low due to the small opening area.

[0069] Thus, it was found that the lower the height H from the bottom surface 31a of the lid member 30 is and the larger the lid diameter is, the earlier the siphon phenomenon starts. As shown in the preferred range surrounded by the dashed line in Tables 1 and 2, it was confirmed that the height H of the lid member 30 is 20 to 50 mm, and the lid diameter of the lid member 30 is in the range of 95 to 185 mm, which is 120 to 250% (95 / 75 to 185 / 75) of the opening outer diameter of the drop mouth portion 34. More preferably, as shown in the most preferred range surrounded by the thick line in Tables 1 and 2, it was confirmed that the height H of the lid member 30 is 30 to 40 mm, and the lid diameter of the lid member 30 is in the range of 110 to 155 mm, which is 150 to 200% (110 / 75 to 155 / 75) or 120 to 150 (120 / 100 to 150 / 100) of the opening outer diameter of the drop mouth portion 34.

[0070] (Second Example) In the second example, the superiority of the shape of the siphon drain member 2 in the above-described embodiment was confirmed by experiment. That is, in the second embodiment, as shown in Table 3, for 15 different shapes of drainage members (A, B, C, D, E, G, H, T, V, F, S, W, X, existing), a gutter with a bottom width of 150 mm was used, and water was allowed to flow into the gutter at flow rates of 4 liters / sec, 5 liters / sec, and 6 liters / sec (equivalent to rainfall of 100 mm / h). The water level was measured at a position 150 mm from the center of the opening of the drop outlet in the extension direction of the gutter, and evaluation items such as siphonage, drainage performance, noise, and ease of molding and assembly were confirmed and evaluated for each case.

[0071] [Table 3]

[0072] The configuration and shape of the drainage member in each case are as shown in Table 3. Specifically, each drainage member has a different lid diameter (mm), height of the lid member from the bottom of the eaves gutter (mm), number of vertical ribs (pieces), rib width (mm) of the vertical ribs, radius of curvature of the connection part of the mounting tube (mm), and shape of the induction guide. Note that the rib width is the width in the direction from the center of the lid member to the outer periphery. The outer diameter of the opening of the drop opening 34 was set to 75 mm. In Table 3, the cone-shaped guide is designated as "R", the radial guide as in the above embodiment is designated as "radial", and the guide without guide is designated as "none." Here, the shape of the case G corresponds to the siphon drain member 2 in the above embodiment.

[0073] FIG. 11 shows the experimental results of the second embodiment, showing the water level (mm) for each case. From the experimental results shown in Figure 11, it was confirmed that the drainage members in cases C, D, E, G, H, and T were stable in terms of water level, siphon phenomenon, and drainage performance. On the other hand, in cases A, B, V, F, S, W, and X, which were existing drainage members, the water level was high and unstable, exceeding 40 mm. Furthermore, it was confirmed that the drainage member in case G was comprehensively superior in the above-mentioned evaluation items.

[0074] Furthermore, from these results, it was confirmed that for each configuration of the drainage member, a lid diameter of 130 mm is preferable, and a height of the lid member from the bottom surface of the eaves gutter is preferable 35 mm. Regarding the number of vertical ribs, six is ​​preferable, with four (case A) being slightly worse and eight (case E) being slightly better. Regarding rib width, 25 mm is preferable, and when it was as large as 55 mm as in case B, the water level rose. In addition, a radius of curvature of the connection part of the mounting tube is preferable 15 mm. Furthermore, it was confirmed that a radial shape of the induction guide as in case G is advantageous for noise reduction, prevention of vortexes, and prevention of water pooling.

[0075] Although an embodiment of the drainage member according to the present invention has been described above, the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

[0076] For example, as in the first modified example shown in Figures 12 to 14, a configuration is possible in which the siphon drain member 2 is provided on the bottom surface 10a of a funnel 10A that connects the ends of the eaves gutters 10, 10 extending in the extension direction in a state where they are butted against each other. The funnel 10A has a bottom wall 14A, a front wall 15A, and a rear wall 16A that are respectively connected in the extension direction of the eaves gutters 10 to the bottom wall 14, front wall 15, and rear wall 16 of the eaves gutters 10 shown in Figure 4 to which it is connected, and a through hole 10b (see Figure 14) is formed in the bottom wall 14A. Even in this case, siphon drain member 2 is inserted into funnel 10A, tube portion 22A of mounting tube 22 is inserted through through hole 10b of funnel 10A and protrudes downward, and step portion 22b of flange portion 22B of mounting tube 22 is engaged and fixed to the periphery of through hole 10b in bottom surface 10a of funnel 10A with a packing or the like interposed therebetween. As a result, siphon drain member 2 is placed at a predetermined position in funnel 10A, and lid member 21 shown in FIG. 13 is also fixed in a state where it is held at a predetermined height position relative to drop opening 20.

[0077] Also, in the above-described embodiment, the siphon drain member 2 is attached by fitting the mounting tube 22 into the through hole 10b formed in the bottom surface 10a of the eaves gutter 10, and the position of the cover member 21 of the siphon drain member 2 (height H from the bottom surface 10a) is determined by this, but the present invention is not limited to being a type that is installed on the bottom surface 10a. In other words, the cover member is not limited to being a drainage member that is integrally combined with the mounting tube 22 and vertical ribs 23, like the above-described siphon drain member 2, and the present invention may be configured so that only the plate-shaped cover member is disposed inside the eaves gutter 10 at a height spaced from the bottom surface 10a. In essence, the cover member must be installed inside the eaves gutter at a position spaced above the bottom surface, positioned so as to cover the opening of the water drop when viewed from above in the vertical direction, with the cover area set to be larger than the opening area of ​​the water drop, and installed at a height of 10 to 50 mm above the bottom surface, and there are no particular restrictions on the mounting structure of the cover member.

[0078] For example, it is possible to employ a hanging-type lid member 40 (drainage member) according to a second modified example shown in Figures 16 to 18. This lid member 40 is made of a plate member having a square shape in a plan view, and is disposed inside the eaves gutter 10, with the mounting tube 22 (see Figure 7) of the above-mentioned embodiment being separated from it. The lid member 40 has side walls 41, 41 extending upward from both ends in the width direction of the eaves gutter 10, and the upper end of each side wall 41 is provided with a locking portion 41a that is locked by being hooked onto the ear portion 17 of the eaves gutter 10 from above.

[0079] The lid member 40 is installed at a position spaced upward from the bottom surface 10a of the eaves gutter 10 as shown in Fig. 17, with the locking portion 41a locked to the ear portion 17 of the eaves gutter 10. An inflow opening 2A is formed between the bottom surface 10a and the underside 40b of the lid member 40, allowing rainwater in the eaves gutter 10 to flow into the drop opening, between the bottom surface 10a and the underside 40b of the lid member 40. The lid member 40 according to this modification is also disposed so as to close the drop opening portion 20 of the mounting tube 22 shown in Fig. 13 when viewed from above in the vertical direction, with the lid area A2 set to be larger than the opening area A1 of the drop opening portion 20, and disposed at a height of 10 to 50 mm above the bottom surface 10a. Further, a plurality of vertical ribs 42 are provided radially on the underside 40b of the lid member 40 in an area that does not overlap with the opening of the drop opening portion 20 when viewed from above in the vertical direction.

[0080] In addition, while the planar shape of the cover member is circular in the above-described embodiment, it is not limited to being circular and may be square (rectangle) as in the above-described modified example, or it may have any shape that is positioned so as to cover the opening of the drop-off portion when viewed from above in the vertical direction. For example, in the case of a rectangular cover member, the minimum width dimension of the rectangle is set to be larger than the outer diameter of the opening of the drop opening portion and to be 245% or less of the outer diameter of the opening.

[0081] In addition, the cross-sectional shape of the cover member is flat in the above-mentioned embodiment, but is not limited to being flat, and may be a shape that protrudes upward or a shape that is concave downward, or may have both a concave and a convex portion. Furthermore, the degree of the protrusion or concavity may be gradual or steep. For example, if the cross-sectional shape of the cover member protrudes upward with a large radius of curvature R, it is possible to prevent rainwater from accumulating on the top surface of the cover, and if the cross-sectional shape of the cover member protrudes downward with a large radius of curvature R, it is possible to smoothly flow rainwater in the eaves gutter toward the opening at the bottom surface of the eaves gutter.

[0082] Furthermore, in this embodiment, the guide 25 is provided on the lower surface 21c of the lid member 21, and the gripping rib 24 is provided on the upper surface 21b, but it is possible to omit the guide 25 and the gripping rib 24, and the present invention is not limited to the shape of this embodiment. Furthermore, the shape and number of the vertical ribs 23 are not limited to those of this embodiment, and for example, the vertical ribs 23 may be eliminated and the lid member 30 may be suspended from a suspender 32 as in the experimental device shown in FIG.

[0083] For example, as in a third modified example shown in Figures 19 and 20, the siphon drain member 2 may be a separate member consisting of the cover member 21, the mounting tube 22, and the vertical rib 23. In this case, the vertical rib 23 is fixed to the mounting tube 22, and the cover member 21 can be coaxially assembled to a disk-shaped support plate 23a fixed to the upper end of the vertical rib 23. Specifically, a through hole 23b is formed in the center of the support plate 23a of the vertical rib 23, and the cover member 21 can be assembled by inserting and engaging a locking protrusion (not shown) formed on the lower surface of the cover member 21 into the through hole 23b.

[0084] 21 , the drop opening 20 may be inclined while the lid member 21 is horizontal, so that the projected area Aa of the drop opening 20 on the horizontal plane T is larger than the projected area Ab of the lid member 21 on the horizontal plane T. In this case, the lid diameter R2 may be the same as the opening outer diameter R1 of the drop opening 20.

[0085] In this embodiment, the top surface 21b of the lid member 21 is flat, but it may be formed into a gently spheric surface with a central portion protruding upward in a plan view. In this case, it is possible to prevent water or foreign matter from accumulating on the top surface 21b of the lid member 21.

[0086] Furthermore, the shapes, dimensions, materials, and other configurations of the eaves gutter 10, downspout 11, and call gutter 12 are not limited to those in the above-mentioned embodiment, and may be set within an appropriate range. For example, the call gutter 12 is disposed horizontally, but may be inclined diagonally downward.

[0087] For example, a drainage member made of the cover member of the present invention can be used in a funnel (eaves gutter) different from the embodiment described above, such as the modified examples shown in Figs. 22 to 24. That is, the first funnel 10B of the fifth modified example shown in Fig. 22 is a Western-style funnel type having a first recess 10d recessed downward from the bottom surface 10a. The cover member 50 in this case is provided directly above the downspout 11 and at a height H of 10 to 50 mm above the bottom surface 10a where the first recess 10d is not formed.

[0088] The second funnel 10C of the sixth modified example shown in Fig. 23 is of the eaves Tee type, in which a second recess 10e is formed that is recessed below the bottom surface 10a and is shallower than the first recess 10d described above. In this case, the lid member 50 is provided at a position directly above the downspout 11 and at a height H of 10 to 50 mm above the bottom surface 10a where the second recess 10e is not formed.

[0089] 24 shows a third funnel 10D of the seventh modification, which is formed with a third recess 10f that is recessed downward from the bottom surface 10a and is deeper than the first recess 10d described above. The cover member 50 in this case is also provided directly above the downspout 11 and at a height H of 10 to 50 mm above the bottom surface 10a where the third recess 10f is not formed.

[0090] Furthermore, within the scope of the present invention, the components in the above-described embodiments can be appropriately replaced with well-known components. [Explanation of symbols]

[0091] 1. Rain gutters 2 Siphon drain parts (drainage parts) 2A inflow opening 10 Gutters 10A, 10B, 10C, 10D Funnel 10a Bottom 10b Through hole 11 Downpipe 12 Call pipe 20 Drop-out section 21 Cover member 22 Mounting tube 23 Vertical ribs 24 Gripping rib 25 Guidance 40 Lid member O Drain shaft R1 Outer diameter of the drop opening R2 Lid diameter A1 Opening area of ​​the drop hole A2 lid area W Rainwater

Claims

1. A drainage member provided in a gutter including an eaves gutter and a vertical gutter connected to a drop opening portion that forms an opening on the bottom side of the eaves gutter, a mounting tube having a tube portion forming the drop opening portion, a plate-shaped flange portion extending radially outward from an upper end of the tube portion, and a plurality of vertical ribs provided on the flange portion; A cover member is installed inside the eaves gutter at a position spaced upward from the bottom surface, and forms an inflow opening between the cover member and the bottom surface to allow rainwater in the eaves gutter to flow into the drop opening; having The connection portion between the cylindrical portion and the flange portion is formed into a tapered surface or a curved surface, The flange has a step portion on the outer circumferential side of the lower surface thereof, the step portion being engaged with the bottom surface of the eaves gutter, The cover member is disposed above the drop opening portion, A guide is formed on the lower surface of the cover member, The height H of the lid member from the bottom surface is 10 mm or more and 50 mm or less, The opening area of ​​the drop opening is 30 cm ２ 190cm or more ２ is as follows: a ratio R1 / H of an opening outer diameter R1 of the drop opening portion to a height H of the lid member is 1.5 to 5.5; A drainage member, characterized in that a lid diameter R2 of the lid member is larger than the opening outer diameter R1 and is 245% or less of the opening outer diameter R1.

2. The drainage member according to claim 1 , wherein the cover diameter R2 is 195% or less of the opening outer diameter R1.

3. The drainage member according to claim 1 or 2, characterized in that the induction guide is conical.

4. With eaves gutter, The drainage member according to any one of claims 1 to 3, which is installed on a bottom surface of the eaves gutter; A downspout joint connected to the mounting tube protruding downward from the bottom of the eaves gutter; A first elbow connected to the downspout joint; A downspout connected to the downspout joint via the first elbow; A second elbow connected to the outlet pipe; A downpipe connected to the call pipe via the second elbow; A gutter comprising: A rain gutter characterized in that the length of the downspout is 2.0 m or more.

5. The gutter according to claim 4, wherein the first elbow and the second elbow have receiving ports provided at both ends of a curved pipe portion, and a radius of curvature of an inner wall surface on an inner periphery of the curved pipe portion when viewed in a cross section including a pipe axis of the first and second elbows is at least greater than 64 mm and less than 125 mm.

6. The rain gutter according to claim 4 or 5, characterized in that the length of the nominal gutter is 0 m or more and 2.0 m or less.

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