Drainage components, rain gutter components, rain gutters, buildings, and rain gutter assembly methods

Abstract

To exert excellent siphon performance in a simple structure with low cost and excellent workability.SOLUTION: A drainage member is provided with a lid member 21 arranged at a position separated upward from a bottom surface 10a inside of an eaves gutter 10 and forming an inflow opening 2A for allowing rain water in the eaves gutter 10 to flow into a shoot between the bottom surface 10a and itself. The lid member 21 is arranged so as to block the opening of a shoot part 20 viewed from a vertical direction. A projection area of the lid member 21 to a surface orthogonal to the vertical direction is set to be larger than the projection area of the opening of the shoot part 20. The lid member 21 is provided at a position of a height H which is 10-50 mm upward from 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 typical gutter system catches rainwater flowing down from the eaves of a roof and drains it downwards. The gutter is attached to the eaves of the roof of a house, and a main gutter or downspout is connected to the gutter using a downspout joint. The downspout is then hung down along the exterior wall and connected to a drainage pipe buried underground. On the other hand, this type of gutter system is required to increase the amount of water discharged per unit time without damaging the appearance of the house, so that rainwater can be efficiently discharged into the drainage pipes even during heavy rain. To increase the amount of water that can be treated by the eaves gutter, it is necessary to increase the cross-sectional dimensions of the eaves gutter itself, or to increase the diameter and number of the main and downspout gutters. However, these methods have problems such as increased costs and a deterioration in the appearance.

[0003] Therefore, as a gutter device that increases the amount of drainage treatment without increasing the diameter or number of pipes, a siphon-type drainage device is known that can drain large amounts of rainwater extremely efficiently by siphon action during heavy rain by appropriately sizing the opening areas of the downspout and main gutter, as described in Patent Document 1. 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, eliminating air intake due to vortex flow. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-308399 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional siphon-type drainage devices such as those shown in Patent Document 1, which are structured to attach a vortex prevention member (drainage member) to the upper end of the siphon pipe, the installation must be done by inserting one's hand near the bottom of the eaves gutter, posing a problem in terms of workability. Also, because the vortex prevention member is shaped to fit the inner surface of the downspout pipe, it is difficult to remove if, for example, foreign matter that has flowed in from the eaves gutter clogs the vortex prevention member, and the work requires time and effort, leaving room for improvement in this regard. In addition, the opening area of ​​the downspout is 20cm 2 Because the volume was small, even using the siphon effect the maximum drainage flow rate was not sufficient. Furthermore, since it is necessary to prepare drainage components that are compatible with each downspout diameter, there are issues with economic viability, and there has been a demand for a system that can be easily adjusted on-site to suit the size of the eaves gutter or downspout, thereby providing optimal siphon performance.

[0006] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a drainage member that is cost-effective, has a simple structure that is easy to work with, and can exhibit 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 rain gutter that has an eaves gutter and a downspout connected to a drop opening that forms an opening on the bottom surface side of the eaves gutter, the drainage member comprising: a tubular portion that forms the drop opening, a plate-shaped flange that extends radially outward from the upper end of the tubular portion, and a plurality of vertical ribs provided on the flange; and a mounting tube that is installed inside the eaves gutter at a position spaced above the bottom surface and that forms an inlet opening between the tubular portion and the flange and the bottom surface for allowing rainwater in the eaves gutter to flow into the drop opening, the connecting portion between the tubular portion and the flange is formed into a tapered surface or a curved surface, and the lower surface of the outer circumferential side of the flange is provided with a step that engages with the bottom surface of the eaves gutter, the lid member is arranged above the drop opening, and an induction guide is formed on the underside of the lid member, the height H of the lid member from the bottom surface is 10 mm to 50 mm, 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 spout 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 lid diameter R2 may be 195% or less of the opening outer diameter R1. The induction guide may be conical. The gutter may also include an eaves gutter, the drainage member installed on the bottom surface of the eaves gutter, a downspout fitting connected to the mounting tube protruding downward from the bottom of the eaves gutter, a first elbow connected to the downspout fitting, a main gutter connected to the downspout fitting 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 have sockets provided at both ends of the curved pipe portion, and the radius of curvature of the inner wall surface on the inner periphery 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 64 mm and less than 125 mm. The length of the outlet gutter may be between 0 m and 2.0 m. In addition, the drainage member of the present invention is a drainage member installed 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 above the bottom surface and forms an inlet opening between the lid member and the bottom surface to allow rainwater in the eaves gutter to flow into the drop outlet, and the lid member is positioned so as to block 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, and is installed at a height of 10 to 50 mm above the bottom surface, and the area of ​​the inlet opening is larger than the opening area of ​​the drop outlet portion.

[0008] In this invention, by closing the opening of the downspout when viewed from above in the vertical direction and positioning the cover member so that it is 10 to 50 mm above the bottom 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 siphoning phenomenon can be generated in the downspout and clogging with foreign objects such as fallen leaves can be prevented, resulting in excellent siphoning 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. Furthermore, 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 siphoning difficult 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] Furthermore, in this invention, a cover member whose projected area is larger than the projected area of ​​the drop opening is set at a predetermined height from the bottom of the eaves gutter. Therefore, the cover member is attached from above the eaves gutter, reducing the amount of work required on the underside of the gutter and reducing the effort and time required to attach and remove the cover member. Furthermore, by changing the height of the cover member from the bottom according to the shape of the eaves gutter (bottom width) and the area of ​​the drop opening, the siphon performance can be adjusted, thereby minimizing the number of cover member variations and reducing costs.

[0010] Furthermore, 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 spout portion and is 245% or less of the outer diameter of the opening.

[0011] In this case, the flow of rainwater flowing in through the inlet opening formed on the underside of the lid member becomes more stable, the water level in the eaves gutter also stabilizes, and siphoning can be reliably performed, thereby improving drainage performance. In particular, if the lid diameter or minimum width dimension of the lid member exceeds 245% of the outer diameter of the opening of the drop spout, much of the rainwater attempting to flow into the inlet opening will collide with the lid member, causing the water level to rise. Therefore, it is preferable that the lid diameter or minimum width dimension of the lid member as described above be larger than the outer diameter of the opening of the drop spout and not more than 245% of the opening outer diameter.

[0012] In addition, 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 from the inlet opening formed on the underside of the cover member becomes more stable, the water level in the eaves gutter also becomes stable, and a siphon can be generated reliably, thereby improving drainage performance.

[0014] Furthermore, 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 outer diameter of the opening of the drop spout portion.

[0015] In this case, by setting the lid diameter or minimum width dimension of the lid member to be in the range of 150 to 200% of the outer diameter of the opening of the drop-off 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 also becomes stable, and a siphon can be generated reliably, thereby improving drainage performance.

[0016] Furthermore, it is preferable that the drainage member of the present invention comprises a cover member formed in a plate shape, an attachment tube having the drop-off portion and fitted into the downspout, and vertical ribs connecting the cover member and the attachment tube and arranged at intervals circumferentially at positions that do not overlap with the opening of the drop-off portion when viewed from above in the vertical direction, and that the inlet opening is formed between the cover member and the attachment tube.

[0017] In this case, the cover member can be positioned in a predetermined position by fitting the mounting tube, which is integrally formed 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 of the present invention, the vertical rib is provided at the inlet opening portion for allowing rainwater to flow into the downspout, so this vertical rib can have a rectifying effect and can more reliably prevent rainwater from drawing in air.

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

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

[0020] According to the drainage member of the present invention, it is possible to reduce costs, have a simple structure that is easy to work with, and exhibit excellent siphon performance. [Brief explanation 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; [Figure 2] FIG. 2 is a diagram illustrating in more detail the schematic configuration of the rain gutter shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view of the elbow shown in FIG. 2. [Figure 4] 1 is a perspective view of a siphon drain member attached to an eaves gutter, viewed obliquely from above. FIG. [Figure 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 seen from the longitudinal direction of the eaves gutter. [Figure 7] FIG. 7 is a view showing the state before the siphon drain member shown in FIG. 6 is attached to the eaves gutter. [Figure 8] FIG. 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. 1 is a side view of an experimental device according to a first embodiment. [Figure 11] 10 is a graph showing experimental results according to the second embodiment. [Figure 12] FIG. 5 is a perspective view of 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] FIG. 13 is a cross-sectional view taken along the line BB shown in FIG. [Figure 14] FIG. 14 is a diagram showing the state before the siphon drain member shown in FIG. 13 is attached to the eaves gutter. [Figure 15] FIG. 10 is a partially cutaway perspective view of the configuration of a cover member according to a second modified example, viewed obliquely from below. [Figure 16] FIG. 10 is a partially cutaway perspective view of the configuration of a cover member according to a second modified example, viewed obliquely from above. [Figure 17] FIG. 10 is a side view of a state in which a cover member according to a second modified example is attached to an eaves gutter. [Figure 18] FIG. 7 is a diagram showing the state before the cover member shown in FIG. 6 is attached to the eaves gutter. [Figure 19] FIG. 11 is a perspective view showing the configuration of a lid member according to a third modified example. [Figure 20] FIG. 20 is an exploded perspective view of the cover member shown in FIG. 19. [Figure 21] FIG. 10 is a side view of a cover member according to a fourth modified example attached to an eaves gutter. [Figure 22] FIG. 11 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 INVENTION

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

[0023] As shown in Figure 1, the siphon drain member 2 (drainage member) of this embodiment has a high drainage function and is installed inside a large eaves gutter 10 located at 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 includes the eaves gutter 10 and a downspout 11 connected to a circular through-hole 10b formed in the bottom surface 10a of the eaves gutter 10 via a downspout 12. The downspout 12 horizontally guides rainwater W flowing down from the siphon drain member 2 provided in the eaves gutter 10. One end of the downspout 12 is connected to the underside 10c of the eaves gutter 10 via a first elbow 12A and a downspout joint 13, and the other end is connected to the upper end of the downspout 11 via a second elbow 12B. In this type of gutter 1, the downspout 11 is arranged vertically along the exterior wall P of the building, and the lower end of the downspout 11 is connected to a drainpipe (not shown) buried underground. Rainwater flowing down from the eaves of the roof is received by the eaves gutter 10, overflows upward, and is discharged into the drainpipe via the downspout 12 and the downspout 11. 1 and 4, the right side of the paper is the building side. 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 made of synthetic resin such as rigid polyvinyl chloride resin, ABS, or AES, and has a channel-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) so as to catch rainwater flowing down from the eaves of the roof. In order to prevent expansion and contraction due to heat, the coefficient of linear expansion of the eaves gutter 10 is 2.0 x 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 iron sheet into the center of the thickness of the eaves gutter 10, or by blending a low-elasticity additive such as wollastonite or carbon fiber into the synthetic resin itself that makes up the eaves gutter 10. Note that the material is not limited to synthetic resin, and extruded metal products 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, one 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 where 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 (plane, the plane of the paper in FIG. 3) including the pipe axis 6C of the curved pipe section 121, the radius of curvature r1 of the inner wall surface 122 on the inner periphery of the curved pipe section 121 and the radius of curvature r2 of the outer wall surface 123 are at least greater than 64 mm and less than 125 mm. In order to allow the rainwater W flowing in from the first receiving port 60A to flow more smoothly without reducing the flow rate, the radii of curvature r1 and r2 are preferably greater than 64 mm and less than 90 mm from the standpoints of storage and transportation, and are preferably greater than 80 mm and less than 100 mm from the standpoint of drainage performance.

[0029] As shown in FIG. 2, the upstream end 12a of the call down pipe 12 is connected to the second receiving port 60B of the first elbow 12A. The call down 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-to-rear direction D2 or extends so that the distance in the front-to-rear direction D2 increases the further downstream it goes. The length from the upstream end 12a to the downstream end 12b of the call down pipe 12 (call down pipe length F1) is greater than 0 m and less than or equal to 2.0 m, preferably 0.6 m to 1.5 m, and more preferably 0.6 m to 1.0 m. By keeping the call down pipe length F1 within the above-mentioned range, rainwater flowing down from the first elbow 12A flows smoothly in a full-filled 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 drains rainwater W that has flowed down the second elbow 12B, and is a straight pipe that extends 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 underground. 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 effect in the downspout 11 is well 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 catch basin 80 with force.

[0033] The siphon drain member 2 shown in Fig. 4 is a drainage member with 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 downspout 11 (more precisely, the lower gutter 12 above the downspout 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 vinyl chloride resin, polycarbonate, ABS, AES, etc. However, it is not limited to synthetic resin, and 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 aligned on a common axis that coincides with the vertical direction. Hereinafter, this common axis will be referred to as the drain axis O, and the side of the siphon drain member 2 that faces the mounting cylinder 22 along the direction of the drain axis O will be referred to as the lower side, and the side that faces the cover member 21 will be referred to as the upper side. In a plan view of the siphon drain member 2 seen from the direction of the drain axis O, the direction perpendicular to the drain axis O will be referred to as the radial direction, and the direction that rotates 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 20, and a plate-like 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 20 corresponds to the inner diameter of the tube portion 22A, and the opening area A1 of the drop opening 20 corresponds to the area obtained by dividing the inner diameter of the tube portion 22A (the opening outer diameter R1 of the drop opening 20) by its diameter. 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, is aligned with the vertical direction, so the lid area A2 of the lid member 21 and the opening area A1 of the drop port portion 20 correspond to the projected area of ​​the lid member 21 and the projected area of ​​the opening of the drop port portion 20, respectively, relative to a plane perpendicular to the vertical direction.

[0036] In the mounting tube 22, the inner connecting portion 22a where the tube portion 22A corresponding to the drop opening portion 20 and the flange portion 22B are connected has a tapered surface or a curved bell-mouth shape. If the inner connecting portion 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 where it is 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 22B has a step 22b formed by cutting out a thin wall around the entire periphery on the lower surface of the outer periphery, and this step 22b is engaged onto the bottom wall 14 (bottom surface 10a) of the eaves gutter 10. In this embodiment, the flange 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 22B becomes the inflow opening 2A through which rainwater W accumulated in the eaves gutter 10 flows into the opening of the drop opening 20. Note that the inflow opening 2A refers to the space between the outer peripheral edge 21a of the cover member 21 and the bottom surface 10a of the eaves gutter 10 or ... flange 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 will be 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 will be 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 lid member 21, which will be described later, are adjusted so that the area of ​​inflow opening 2A is larger than the opening area A1 of drop opening portion 20. In this embodiment, the area of ​​inflow opening 2A can be calculated by multiplying the circumference of circular lid member 21, i.e., the length of outer peripheral edge 21a, by height H of lid member 21, which will be described later.

[0038] As shown in Fig. 5, the multiple 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. In other words, the cover member 21 is supported from below by the multiple vertical ribs 23, 23, ... and 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 on the inlet opening 2A and are curved and intersect with the radial direction in a plan view. In other words, the vertical ribs 23 have the function of rectifying the rainwater W that flows from the inlet opening 2A into the drop opening 20.

[0039] As described above, the cover member 21 is supported from below by the multiple vertical ribs 23, 23, ... and is supported by the mounting tube 22. As described above, the cover member 21 is disposed inside the eaves gutter 10 and is installed at a position spaced above the drop opening 20, and forms an inlet opening 2A in the bottom surface 10a of the eaves gutter 10 below the cover member 21, which allows rainwater W to flow into the drop opening 20.

[0040] Lid member 21 is arranged to close the opening of drop mouth portion 20 when viewed from above in the vertical direction, and lid area A2 shown in FIG. 8 is set larger than opening area A1 of drop mouth portion 20 (see FIG. 5). In this embodiment, the center of lid member 21 and the center of the opening of drop opening portion 20 coincide vertically, but if eaves gutter 10 itself is tilted and both lid member 21 and drop opening portion 20 are at an angle, then if lid area A2 is the same as opening area A1 of drop opening portion 20, the opening of drop opening portion 20 cannot be blocked when viewed vertically, and a gap through which air enters (an air core due to a vortex) will be created between lid member 21 and drop opening portion 20. For this reason, it is preferable that the projected area of ​​lid member 21 on a plane perpendicular to the vertical direction is set larger than the projected area of ​​the opening of drop opening 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 diameter R2 of the lid member 21 is preferably set to be larger than the opening outer diameter R1 of the downspout portion 20 and equal to or less than 245% of this opening outer diameter R1. This means that when the opening outer diameter R1 is 75 mm, a good water level can be maintained in the eaves gutter 10 if the lid diameter R2 is 185 mm or less (i.e., 185 mm / 75 mm ≈ 245%). Note that if the lid diameter R2 of the lid member 21 exceeds 245% of the opening outer diameter R1 of the downspout portion 20, much of the rainwater attempting to flow into the inlet opening will collide 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 can be greater than 75 mm and equal to or less than 185 mm. It should be noted that even if the height of the cover member 21 is not constant due to tilting or the like, 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 that the lid diameter R2 is set to 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 downspout 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. Also, 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 angle 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 angle to 200% or less, the fit becomes smaller, preventing the joints and supports from becoming larger.

[0043] In order 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. In order for the siphon action to occur stably, 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 cover member 21 is not constant because it is tilted, for example, the maximum height of the height H of the cover member 21 may be set to 0.1 to 0.5 times the maximum water level in the eaves gutter 10.

[0044] Furthermore, the opening outer diameter R1 of the drop opening 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 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 the upper limit of 170 mm or less, the installation becomes smaller, preventing the joints and supports from becoming larger.

[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 circumferentially. By gripping these gripping ribs 24, the siphon drain member 2 can be easily rotated when tightening it. The gripping rib 24 consists of a circumferentially extending rib body 24A and extensions 24B that protrude 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 adjacent gripping ribs 24, 24, and then rotated to tighten the siphon drain member 2. Furthermore, because gaps are formed between the gripping ribs 24, 24, debris such as fallen leaves in the eaves gutter 10 can easily pass through, preventing tangling.

[0046] 5 to 7, the cover member 21 is provided with a plurality of guides 25, each having a curve that gradually extends downward toward the drain axis O (the cover center) at the center of the underside 21c in a plan view, that extend radially from the drain axis O. The guides 25 are intended to guide 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 (eaves gutter 10, downspout 11, and siphon drain member 2) having the above-described siphon drain member 2 will be specifically described. First, as shown in Fig. 7, a through-hole 10b is drilled in the bottom wall 14 of the eaves gutter 10 at the position where the siphon drain member 2 is to be attached. Next, the siphon drain member 2 is inserted into the eaves gutter 10, and the tubular portion 22A of the mounting tube 22 is inserted through the through-hole 10b of the eaves gutter 10 so that it protrudes downward. The stepped 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 using a packing or the like. As a result, the siphon drain member 2 is placed in a predetermined position within the eaves gutter 10, and the cover member 21 is also fixed while being held at a predetermined height H relative to the drop opening 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 a main gutter 12 is attached using a first elbow 12A and a second elbow 12B as shown in Figure 1, and then a 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 through the inlet opening 2A, passes through the drop opening 20, flows down the main gutter 12, and then flows down into the downspout 11. The rainwater W that flows from the main gutter 12 into the downspout 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 downspout 11 is filled with water and sealed, so the downspout 11 flows down, filling it with water, causing a siphon effect within the drop opening 20, the main gutter 12, and the downspout 11, and the rainwater is forcefully discharged from the downspout 11 into the drain pipe.

[0050] As for the procedure for assembling the gutter 1 in this embodiment, as described above, the procedure of first fixing the siphon drain member 2 to a predetermined position on the eaves gutter 10 and then installing the downspout 12 and the downspout 11 is just one example, and it is also possible to assemble it using other procedures, such as first assembling the downspout 11 and the downspout 12, and then attaching the siphon drain member 2 to the downspout joint 13 connected to the downspout 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 downspout portion 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. This allows the downspout 11 to fill up and be sealed with water without sucking in air, even when a large amount of rainwater flows in from the inlet opening during heavy rain. Therefore, a siphoning phenomenon can be generated in the downspout 11, and clogging with foreign matter such as fallen leaves can be prevented, resulting in excellent siphoning 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, as shown in FIG. 9(c), foreign matter such as fallen leaves will easily clog the inlet opening 2A, and the area of ​​the inlet opening 2A will be reduced, making it impossible to ensure the desired drainage flow rate. Also, as shown in FIG. 9(b), if the height H of the cover member 21 from the bottom surface 10a of the eaves gutter 10 exceeds 50 mm, the water level of the rainwater W required for siphoning will rise too high, making it easier for air to be sucked in, making siphoning difficult and reducing drainage performance. 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 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, which has a lid area A2 (see FIG. 8) larger than the opening area A1 of the drop opening portion 20, is set at 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 required on the underside 10c (see FIG. 1) of the eaves gutter 10 and reduces the effort and time required to attach and remove 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 according to 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] Furthermore, by setting the lid diameter R2 of the lid member 21 to be larger than the opening outer diameter R1 of the downspout portion 20 but not exceeding 245% 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 underside 21c of the lid member 21 becomes more stable, the water level in the eaves gutter 10 also stabilizes, and siphoning can be reliably performed, thereby improving drainage performance. In particular, if the lid diameter R2 or minimum width dimension of the lid member 21 exceeds 245% of the opening outer diameter R1 of the downspout portion 20, much of the rainwater W attempting to flow into the inlet opening 2A will collide 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 be larger than the opening outer diameter R1 of the downspout portion 20 but not exceeding 245% of the opening outer diameter R1. Furthermore, the minimum outer diameter of the lid diameter R2 of the lid member 21 may be larger than the opening outer diameter R1 of the drop opening portion 20, and the outer periphery of the lid diameter R2 may be equal to or greater than 245% of the outer periphery of the 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 also becomes stable, 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-out 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 also becomes stable, and a siphon can be generated reliably, thereby improving drainage performance.

[0057] Furthermore, in the siphon drain member 2 of this embodiment, the cover member 21 can be positioned in a predetermined position by fitting the mounting tube 22, to which the cover member 21 is integrally attached via the vertical rib 23, into the downspout joint 13 provided on the downspout 11. An inlet opening 2A of a suitable size is formed between the underside 21c of the cover member 21 and the bottom surface 10a of the eaves gutter 10, facilitating the installation of the siphon drain member 2. Moreover, in the siphon drain member 2 of this embodiment, the vertical rib 23 is provided at the inlet opening 2A portion for allowing rainwater W to flow into the downspout, and this vertical rib 23 can have a rectifying effect, making it possible to more reliably prevent the rainwater W from drawing in air.

[0058] In addition, in this embodiment, 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-off portion 20, thereby more reliably preventing the rainwater W from drawing in air.

[0059] As described above, in this embodiment, excellent siphon performance can be achieved with a simple structure that is cost-effective and easy to work with.

[0060] Next, an example will be described below to demonstrate the effect of the drainage member according to the above-described embodiment.

[0061] (First Example) In the first example, a lid member 21 corresponding to the lid member 21 of the above-described embodiment was used, and an experiment was conducted to generate a siphon 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 state was confirmed.

[0062] Figure 10 shows the experimental equipment used in this first example. The cover member 30 is disk-shaped and suspended from a hanging fixture 32 fixed to the ear 31b of the eaves gutter 31 using a bolt member 33 supported downward so that its height can be adjusted. The height of the cover member 30 suspended by the hanging fixture 32 from the bottom surface 31a of the eaves gutter 31 can be adjusted, and experiments were conducted with five different heights, as described below. As with the above-described embodiment, the cover member 30 was positioned to block the opening of the downspout 34 inside the downspout joint 36 in a top view in all 18 experiments described below. The cover diameter R2 of the cover member 30 was larger than the opening outer diameter R1 (set to 75 mm or 100 mm) of the downspout 34. In Figure 10, a downspout is connected downstream of the elbow 35. Table 1 shows the experimental conditions and results when the opening outer diameter R1 in Example 1 was 75 mm. Table 2 shows the experimental conditions and results when the opening outer diameter R1 in Example 1 was 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. When 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, with three cases of a bottom width of 120 mm and lid diameters of 70 mm, 80 mm, and 95 mm, two cases of a bottom width of 150 mm and lid diameters of 110 mm and 125 mm, and five cases of 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. The right columns in 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 from the bottom surface 31a of the eaves gutter 31 of the cover member 30 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 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 results of the experiment 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 in cases 2 to 9 where the opening outer diameter R1 was 75 mm, and was in the range of 185 mm or less (245% or less of the opening outer diameter), and larger than the opening outer diameter (100 mm) of the drop-off portion 34 in cases 12 to 18 where the opening outer diameter R1 was 100 mm, and was in the range of 195 mm or less (245% or less of the opening outer diameter).

[0068] In Tables 1 and 2, it was confirmed that the water level was kept low in the area surrounded by the dashed line because the balance between the height of the lid member 30 and the lid 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 lid member 30, and the lid diameter was good. On the other hand, when the height of the cover member 30 is large (over 40 mm in this experiment) and the cover diameter is small (less than 95 mm in this experiment), it was confirmed that 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 proportion of the water flow flowing in from the inlet opening that collides with the lid member 30 increases, 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] As described above, it was found that the siphon effect occurs more quickly with a decrease in the height H from the bottom surface 31a of the lid member 30 and a decrease in the lid diameter. It was also confirmed that, as shown in the preferred ranges enclosed by the dashed-dotted lines in Tables 1 and 2, the height H of the lid member 30 is preferably 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 spout 34. It was also confirmed that, as shown in the most preferred ranges enclosed by the bold lines in Tables 1 and 2, the height H of the lid member 30 is more preferably 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 spout 34.

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

[0071] [Table 3]

[0072] The configuration and shape of the drainage member for each case are as shown in Table 3. Specifically, each drainage member was designed with different lid diameters (mm), heights of the lid member from the bottom of the eaves gutter (mm), number of vertical ribs (pieces), widths of the vertical ribs (mm), radius of curvature of the connecting portion of the mounting tube (mm), and shape of the guide. The rib width is the width from the center of the lid member toward its outer periphery. The outer diameter of the opening of the drop opening 34 was set to 75 mm. In Table 3, the guide is designated as "R" if it is conical, "radial" if it is radial like the embodiment described above, and "none" if there is no guide. Here, the shape of the case G corresponds to the siphon drain member 2 in the embodiment described above.

[0073] FIG. 11 shows the experimental results of the second embodiment, showing the water level (mm) for each case. The experimental results shown in Figure 11 confirmed that the drainage members in cases C, D, E, G, H, and T were stable in terms of water level, siphoning, and drainage performance. On the other hand, in cases A, B, V, F, S, W, and X, where the existing drainage members were used, the water level was high and unstable, exceeding 40 mm. Furthermore, it was confirmed that the drainage member in case G was superior overall 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 35 mm from the bottom of the eaves gutter is preferable. 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 is as large as 55 mm, as in Case B, the water level becomes high. In addition, a radius of curvature of the connecting part of the mounting tube is preferable to 15 mm. Furthermore, it was confirmed that a radial guide shape, as in Case G, is advantageous for noise reduction, preventing vortices and preventing water accumulation.

[0075] Although the 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 within the scope of the gist 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 a siphon drain member 2 is provided on the bottom surface 10a of a funnel 10A that connects the ends of eaves gutters 10, 10 extending in the extension direction with each end butting against each other. Funnel 10A has a bottom wall 14A, a front wall 15A, and a rear wall 16A that are respectively connected 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, in the extension direction of the eaves gutters 10, and a through hole 10b (see Figure 14) is formed in bottom wall 14A. In this case as well, 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 so that it protrudes downward, and step portion 22b of flange 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 within funnel 10A, and lid member 21 shown in FIG. 13 is also fixed while being held at a predetermined height relative to drop opening 20.

[0077] Furthermore, 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, thereby determining the position (height H from the bottom surface 10a) of the siphon drain member 21, but the present invention is not limited to being an installation type relative to the bottom surface 10a. In other words, the lid member is not limited to being a drainage member configured to be integrally combined with the mounting tube 22 and vertical ribs 23, as in the above-described siphon drain member 2, and the lid member alone may be configured to be positioned inside the eaves gutter 10 at a height spaced apart from the bottom surface 10a. In short, the cover member is installed inside the eaves gutter at a position above the bottom surface, is positioned so as to cover the opening of the drop-off section when viewed from above in the vertical direction, has a cover area larger than the opening area of ​​the drop-off section, and is installed at a height of 10 to 50 mm above the bottom surface, and there are no particular restrictions on the installation structure of the cover member.

[0078] For example, it is also 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 that is square in plan view, is placed inside the eaves gutter 10, and is separate from the mounting tube 22 (see Figure 7) of the embodiment described above. The lid member 40 has side wall portions 41, 41 that extend upward from both ends of the eaves gutter 10 in the width direction, and the upper end of each side wall portion 41 is provided with locking portions 41a that are hooked onto the ear portions 17 of the eaves gutter 10 from above and locked.

[0079] The cover member 40 is installed at a position spaced above the bottom surface 10a of the eaves gutter 10, as shown in Fig. 17, with the locking portions 41a locked onto and fixed to the ears 17 of the eaves gutter 10. An inlet opening 2A is formed between the bottom surface 10a and the underside 40b of the cover member 40, allowing rainwater in the eaves gutter 10 to flow into the outlet. The cover member 40 of this modified example is also arranged to close the outlet portion 20 of the mounting tube 22 shown in Fig. 13 when viewed from above in the vertical direction, and the cover area A2 is set larger than the opening area A1 of the outlet portion 20, and is installed at a height of 10 to 50 mm above the bottom surface 10a. Furthermore, 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] Furthermore, in the above-described embodiment, the planar shape of the cover member is circular, but it is not limited to being circular, and may be square (rectangular) as in the above-described modified example, or in other words, it may have any shape that is positioned to block 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] Furthermore, while the cross-sectional shape of the cover member is flat in the above-described embodiment, it is not limited to being flat. It may be a protruding shape upward, a concave shape downward, or a shape with both a concave and a convex portion. Furthermore, the degree of protrusion or concavity may be gradual or steep. For example, a protruding cover member whose cross-sectional shape has a large radius of curvature R upward can prevent rainwater from accumulating on the top surface of the cover, while a protruding cover member whose cross-sectional shape has a large radius of curvature R downward can smoothly flow rainwater in the eaves gutter toward the opening at the bottom of the eaves gutter.

[0082] Furthermore, in this embodiment, the lower surface 21c of the lid member 21 is provided with the guide 25, and the upper surface 21b is provided with the gripping rib 24, but it is also possible to omit the guide 25 and the gripping rib 24, and the configuration is not limited to that 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 and supported by a suspender 32, as in the experimental device shown in Figure 10.

[0083] 19 and 20, the siphon drain member 2 may be formed as separate members, consisting of the lid 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 lid 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 assembly can be achieved by inserting and engaging a locking protrusion (not shown) formed on the underside of the lid member 21 into this through hole 23b.

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

[0085] In this embodiment, the top surface 21b of the lid member 21 is flat, but it may be formed as a gently spheric surface with a central portion projecting upward in a plan view, for example. 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-described embodiment, and can 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 a 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. 22 is a Western-style funnel-shaped first funnel having a first recess 10d recessed downward from the bottom surface 10a. In this case, the cover member 50 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 cheese type, in which a second recess 10e is formed that is recessed downward from the bottom surface 10a and is shallower than the first recess 10d described above. In this case, the lid member 50 is provided directly above the downspout 11, 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 a seventh modified example, which has 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, 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 replaced with well-known components as appropriate. [Explanation of symbols]

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

Claims

1. A drainage member provided in a rain gutter, comprising a gutter with a through hole formed in its bottom surface, and a downpipe connected to the gutter via a downpipe joint connected to the lower surface of the gutter, A cylindrical tube portion is inserted into the aforementioned through hole to form a drop-off opening, A flange portion installed on the bottom surface of the aforementioned gutter, It has a lid member positioned above the aforementioned outlet, An inflow opening is formed between the lid member and the flange portion. It is provided with a plurality of vertical ribs connecting the flange portion and the lid member, The aforementioned longitudinal ribs are formed in a plate-like shape extending in the radial direction, The upper end of the cylindrical portion is below the bottom surface of the gutter. The lower end of the vertical rib is located between the upper end of the cylindrical portion and the bottom surface of the gutter. The cylindrical portion, the flange portion, the lid member, and the vertical rib are integrally formed. The outer surface of the cylindrical portion has a male thread that can be screwed into the female thread formed on the inner surface of the downpipe joint. The opening area of ​​the aforementioned drain outlet is 30 cm². ２ 190cm or more ２ The following, A drainage member in which the ratio R1 / H, which is the ratio of the outer diameter R1 of the opening of the drainage outlet to the height H of the lid member, is 1.5 to 5.

5.

2. The drainage member according to claim 1, wherein the connection portion between the cylindrical portion and the flange portion is formed as a tapered surface or a curved surface.

3. The drainage member according to claim 1 or 2, wherein the vertical ribs connect the upper surface of the flange portion and the lid member.

4. The drainage member according to any one of claims 1 to 3, characterized in that the height of the cover member from the bottom surface is 0.1 to 0.5 times the maximum water level in the gutter.

5. A guide is formed on the lower surface of the lid member. The drainage member according to any one of claims 1 to 4, characterized in that the guide is conical in shape.

6. The drain member according to any one of claims 1 to 4, wherein the lid member has a shape that is recessed downwards in cross-sectional view.

7. The components of the rain gutter that constitute the aforementioned rain gutter, The aforementioned downpipe joint and, A drainage member according to any one of claims 1 to 6, A component of a rain gutter, wherein the inner surface of the downpipe joint has a female thread that can be screwed into the male thread formed on the outer surface of the cylindrical portion.

8. Eaves gutter and, A drainage member according to any one of claims 1 to 6, installed on the bottom surface of the eaves gutter, A downpipe joint connected to the cylindrical portion that protrudes downward from the bottom of the aforementioned gutter, A rain gutter comprising a downpipe connected to the downpipe joint mentioned above.

9. The first elbow connected to the downpipe joint, A downpipe connected to the downpipe joint via the first elbow, The second elbow connected to the aforementioned downpipe, The downpipe connected to the aforementioned downpipe via the second elbow, The rain gutter according to claim 8, comprising:

10. A roof with eaves, The gutter positioned at the eaves, A drainage member according to any one of claims 1 to 6, installed on the bottom surface of the eaves gutter, A downpipe joint connected to the cylindrical portion that protrudes downward from the bottom of the aforementioned gutter, A building comprising a downpipe connected to the downpipe joint mentioned above.

11. By making through holes in the gutters located at the eaves, A drainage member according to any one of claims 1 to 6 is attached to the through hole. A method for assembling a rain gutter, comprising connecting a downpipe to the aforementioned drainage member.

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