Drain member and piping structure

Abstract

To provide a drain member and a piping structure capable of smoothly inserting an inner cylinder part of an upper drain member into an outer cylinder part of a lower drain member.SOLUTION: The drain member 100 includes a lower drain member 110 and an upper drain member 120. The second outer tubular portion 113 of the lower drain member 110 is disposed inside the first outer tubular portion 112, and an inner peripheral screw portion 115 is provided on an inner surface thereof. The inner cylindrical portion 122 of the upper drain member 120 is provided with an outer peripheral screw portion 125 screwed with the inner peripheral screw portion 115 on the outer peripheral surface. The lower drain member 110 includes a lower guide sleeve 116 that guides the inner tubular portion 122 to the inner peripheral side of the second outer tubular portion 113 when the upper drain member 120 and the lower drain member 110 are attached to each other.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a drain member and piping structure that are attached to an eaves gutter and connect the eaves gutter to a downstream downspout or joint. [Background technology]

[0002] As is well known, siphon drain members with high drainage capabilities are widely used inside large eaves gutters placed at the eaves of buildings in large facilities such as factories and shopping centers (see, for example, Patent Document 1).

[0003] Such siphon drain members generally comprise a drain member that includes a lower drain member that is placed on the underside across the bottom plate of the eaves gutter, and an upper drain member that is placed on the upper side and has a siphon portion formed on top. Such a drain member having a lower drain member and an upper drain member is not limited to a siphon drain member and is used in a variety of applications.

[0004] 33, the drain member 900 includes, for example, a lower drain member 910 arranged on the underside of the bottom plate (eaves gutter) 11 (10), and an upper drain member 920 arranged above the eaves gutter 10. The siphon drain member is structured to include, for example, a siphon portion 950 arranged above the upper drain member 920, as shown in FIG.

[0005] The lower drain member 910 has, for example, a lower flange portion 911 having a receiving port formed on its inner circumferential side, an outer tube portion 912 formed below the lower flange portion 911, and an outer tube reduced diameter portion 913 connecting the lower flange portion 911 and the outer tube portion 912, and an inner peripheral thread portion 915 is formed on the inner circumferential surface of the outer tube portion 912.

[0006] The upper drain member 920 has, for example, an upper flange portion 921 having a drop-off portion formed on its inner periphery, an inner tube portion 922 formed below the upper flange portion 921, and an inner tube reduced diameter portion 923 connecting the upper flange portion 921 and the inner tube portion 922, and an outer peripheral thread portion 925 is formed on the outer peripheral surface of the inner tube portion 922.

[0007] The lower drain member 910 is placed on the underside of the bottom plate 11 of the eaves gutter 10, and the upper drain member 920 is placed on the upper side of the bottom plate 11 of the eaves gutter. The inner tube portion 922 is inserted into the outer tube portion 912 through the pilot hole 11H, and the lower drain member 910 and the upper drain member 920 are positioned so that their pipe axes O1 and O2 are approximately coaxial. The inner threaded portion 915 and the outer threaded portion 925 are screwed together to form the drain member 900.

[0008] In addition, the lower drain member 910 has a step portion 914 formed at the bottom of the outer tube reduced diameter portion 913, and the lower surface 914A of the step portion 914 abuts against the upper end surface of the receiving portion of the elbow (not shown) connected downstream, thereby setting the distance between the drain members 900 to a predetermined dimension. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-007340 Summary of the Invention [Problem to be solved by the invention]

[0010] However, when inserting the inner cylindrical portion 922 into the outer cylindrical portion 912 to combine the lower drain member 910 and the upper drain member 920, the lower end portion 922T of the inner cylindrical portion 922 may get caught on the upper surface 914B of the step portion 914, as shown in Figure 34. In this way, if the lower end 922T of the inner cylindrical portion 922 gets caught on the upper surface 914B of the step portion 914, it becomes difficult to smoothly insert the inner cylindrical portion 922 into the outer cylindrical portion 912 and efficiently position it in the desired position.

[0011] 34, gaps may be formed at intervals in the circumferential direction in the inner peripheral thread portion 915 formed on the inner peripheral surface of the outer cylindrical portion 912. Therefore, as shown in Fig. 35, when the inner cylindrical portion 922 is inserted into the outer cylindrical portion 912 to assemble the lower drain member 910 and the upper drain member 920, the outer peripheral thread portion 925 may enter into the gap formed in the inner peripheral thread portion 915, and the inner peripheral thread portion 915 and the outer peripheral thread portion 925 may be fitted together with the pipe axes O1 and O2 tilted. If the inner peripheral thread portion 915 and the outer peripheral thread portion 925 are engaged with the pipe axes O1 and O2 tilted, the pipe axes O1 and O2 of the lower drain member 910 and the upper drain member 920 will not be aligned coaxially, and the upper drain member 920 will be engaged at an angle relative to the lower drain member 910, which may prevent the desired siphon action from occurring or may result in a gap between the upper drain and the bottom surface of the eaves gutter, resulting in water leakage. Therefore, there is a need for a drain member that allows the inner cylindrical portion of the upper drain member to be smoothly inserted into the outer cylindrical portion of the lower drain member and efficiently positioned in a predetermined position.

[0012] The present invention has been made in consideration of these circumstances, and aims to provide a drain member and a piping structure that allows the inner cylindrical portion of the upper drain member to be smoothly inserted into the outer cylindrical portion of the lower drain member. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a drainage member that has a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, and is attached to an eaves gutter with a pilot hole formed in the bottom plate, the drainage member having a lower flange portion that is arranged on the underside of the bottom plate and bonded to the underside, a first outer tubular portion that is formed below the lower flange portion and extends downward, a second outer tubular portion that is arranged inside the first outer tubular portion and has an inner peripheral engagement portion on its inner surface, and a connecting portion that connects the first outer tubular portion and the second outer tubular portion, and an upper flange portion that is arranged on the top surface of the bottom plate and has a drop opening formed on its inner peripheral side. an inner cylindrical portion formed below the upper flange portion and extending downward to be inserted into the second outer cylindrical portion; an inner cylindrical portion having a reduced diameter portion connecting the upper flange portion and the upper end of the inner cylindrical portion and reducing in diameter as it extends downward; and an outer peripheral engaging portion formed on the outer peripheral surface of the inner cylindrical portion and screwed into the inner peripheral engaging portion, wherein at least one of the upper drain member and the lower drain member has an insertion guide portion that guides the inner cylindrical portion toward the inner peripheral side of the second outer cylindrical portion when the upper drain member and the lower drain member are attached to each other.

[0014] According to the drain member of the present invention, at least one of the upper drain member and the lower drain member has an insertion guide portion, so that when the upper drain member and the lower drain member are attached, the inner cylindrical portion can be guided toward the inner periphery of the second outer cylindrical portion by abutting the lower end of the upper drain member against the upper end of the second outer cylindrical portion. This prevents the outer peripheral engaging portion of the upper drain member from being fitted to the second outer cylindrical portion while tilted. As a result, the inner cylindrical portion of the upper drain member can be smoothly inserted into the second outer cylindrical portion of the lower drain member. Alternatively, the second outer cylindrical portion of the lower drain member can be smoothly fitted to the inner cylindrical portion of the upper drain member.

[0015] The lower drain member is also equipped with two components, a first outer tubular portion and a second outer tubular portion. This makes it easy to match the color of the first outer tubular portion with the color of the underside of the eaves gutter, for example. This allows for a clean appearance for the drain member and the eaves gutter.

[0016] Furthermore, by providing the lower drain member with a first outer tubular portion and a second outer tubular portion, for example, the first outer tubular portion and the second outer tubular portion can be connected so as to be rotatable relative to each other. The second outer tubular portion is provided with an inner circumferential engaging portion that is threadedly engaged with the outer circumferential engaging portion of the upper drain member. Therefore, for example, it is possible to rotate the inner circumferential engaging portion of the second outer tubular portion relative to the outer circumferential engaging portion, and to rotate the second outer tubular portion relative to the first outer tubular portion. This makes it easier to temporarily align the orientation of an elbow (joint) by rotating the second outer tubular portion, for example, when connecting the lower end of the second outer tubular portion to the elbow.

[0017] Alternatively, even if the first and second outer cylinders are connected so that they cannot rotate relative to each other, the second outer cylinder can be rotated together with the first outer cylinder before the lower flange is attached to the underside of the eaves gutter to make it easier to temporarily align the orientation of the elbow. After temporarily aligning the orientation of the elbow, the lower flange is attached to the underside of the eaves gutter to ensure a watertight seal between the lower flange and the underside of the eaves gutter.

[0018] Furthermore, when connecting an elbow to the lower end of the first outer cylinder, before the lower flange is bonded to the underside of the eaves gutter, the orientation of the elbow can be easily temporarily aligned by, for example, rotating the first outer cylinder relative to the second outer cylinder. After temporarily aligning the orientation of the elbow, the lower flange is bonded to the underside of the eaves gutter to ensure a watertight seal between the lower flange and the underside of the eaves gutter.

[0019] (2) In the drain member described in (1) above, the insertion guide portion may be constituted by an upper guide sleeve extending downward from the lower end of the outer peripheral engagement portion, or a lower guide sleeve extending upward from the upper end of the inner peripheral engagement portion.

[0020] According to the drain member of the present invention, the insertion guide portion can be configured simply by extending the upper guide sleeve downward from the lower end of the outer peripheral engagement portion or by extending the lower guide sleeve upward from the upper end of the inner peripheral engagement portion, thereby enabling the insertion guide portion to be configured in a simple shape.

[0021] (3) In the drain member described in (1) or (2) above, the connecting portion may be composed of an engaged portion provided on the inner surface of the first outer cylindrical portion and an engaging portion provided on the outer surface of the second outer cylindrical portion.

[0022] According to the drain member of the present invention, the coupling portion is formed by the engaged portion of the first outer tubular portion and the engaging portion of the second outer tubular portion. Therefore, for example, the first outer tubular portion and the second outer tubular portion can be coupled to each other so that they can rotate relative to each other. This makes it easy to temporarily align the orientation of an elbow (joint) by rotating the first outer tubular portion or the second outer tubular portion when connecting the elbow (joint) to the lower end of the first outer tubular portion or the lower end of the second outer tubular portion.

[0023] (4) In the drain member described in (1) or (2) above, the connecting portion may be formed of a bridge portion that integrally connects the inner surface of the first outer cylindrical portion and the outer surface of the second outer cylindrical portion.

[0024] According to the drain member of the present invention, the connecting portion is formed by a bridge portion that integrally connects the first outer tubular portion and the second outer tubular portion, which eliminates the step of assembling the first outer tubular portion and the second outer tubular portion, thereby improving productivity.

[0025] (5) In the drain member according to any one of (1) to (3) above, a recess may be provided at a lower end of the first outer cylindrical portion or a lower end of the second outer cylindrical portion.

[0026] According to the drain member of this invention, a recess is provided at the lower end of the first outer tubular portion or the lower end of the second outer tubular portion. Therefore, for example, when threading the outer peripheral engaging portion of the upper drain member and the inner peripheral engaging portion of the lower drain member, it is possible to insert (engage) a construction tool into the recess to rotate the lower drain member. This allows the outer peripheral engaging portion and the inner peripheral engaging portion to be securely threaded together, thereby securely fixing the upper drain member and the lower drain member to the bottom plate of the eaves gutter, for example.

[0027] (6) In the drain member described in any one of (1) to (4) above, a lower end of the first outer cylindrical portion may be formed as a spigot that is connected to a fitting.

[0028] According to the drain member of the present invention, the lower end of the first outer tubular portion is formed as a spigot for connecting to a fitting. This makes it easy to temporarily align the orientation of the elbow when connecting a fitting such as an elbow to the spigot of the first outer tubular portion, for example, by rotating the first outer tubular portion relative to the second outer tubular portion before bonding the lower flange portion to the underside of the eaves gutter. After temporarily aligning the orientation of the elbow, the lower flange portion is bonded to the underside of the eaves gutter to ensure a watertight seal between the lower flange portion and the underside of the eaves gutter.

[0029] (7) In the drain member described in any one of (1) to (4) above, a lower end of the second outer cylindrical portion may be formed as a spigot that is connected to a fitting.

[0030] According to the drain member of the present invention, the lower end of the second outer tubular portion is a spigot for connection to a fitting. Here, by providing the lower drain member with the first and second outer tubular portions, for example, the first and second outer tubular portions can be connected to each other so as to be rotatable relative to each other. The second outer tubular portion is provided with an inner circumferential engaging portion that is threadedly engaged with the outer circumferential engaging portion of the upper drain member. Therefore, for example, it is possible to rotate the inner circumferential engaging portion of the second outer tubular portion relative to the outer circumferential engaging portion, and to rotate the second outer tubular portion relative to the first outer tubular portion. This makes it easier to temporarily align the orientation of an elbow (fitting) when connecting it to the spigot of the second outer tubular portion.

[0031] Alternatively, for example, even if the first and second outer cylinders are connected so that they cannot rotate relative to each other, the second outer cylinder can be rotated together with the first outer cylinder before the lower flange is attached to the underside of the eaves gutter, making it easier to temporarily align the orientation of the elbow. After temporarily aligning the orientation of the elbow, the lower flange is attached to the underside of the eaves gutter to ensure a watertight seal between the lower flange and the underside of the eaves gutter.

[0032] (8) The drain member according to any one of (1) to (7) above may have a cover that covers the outside of the first outer cylindrical portion.

[0033] The drain member according to the present invention includes a cover that covers the outside of the first outer tubular portion. Therefore, for example, it is possible to cover the lower flange portion together with the first outer tubular portion with the cover. This allows the drain member and the eaves gutter to have a neater appearance. Furthermore, for example, it is easy to match the color of the cover with the color of the underside of the eaves gutter, which makes the appearance of the drain member and the eaves gutter even neater.

[0034] In addition, for example, the lower end of the cover can be used as a spigot to connect to a fitting. This makes it easier to temporarily align the direction of the elbow when connecting a fitting such as an elbow to the spigot of the cover by rotating the cover before bonding the lower flange to the underside of the eaves gutter. After temporarily aligning the direction of the elbow, the lower flange is bonded to the underside of the eaves gutter to ensure a watertight seal between the lower flange and the underside of the eaves gutter.

[0035] (9) A second aspect of the present invention is a piping structure, characterized by including the drain member according to any one of (1) to (8) above.

[0036] The piping structure according to the present invention can prevent the outer peripheral engaging portion of the upper drain member from being fitted to the second outer cylindrical portion while tilted. As a result, the inner cylindrical portion of the upper drain member can be smoothly inserted into the second outer cylindrical portion of the lower drain member. Alternatively, the second outer cylindrical portion of the lower drain member can be smoothly fitted to the inner cylindrical portion of the upper drain member. [Effects of the Invention]

[0037] According to the drain member and piping structure of the present invention, the inner cylindrical portion of the upper drain member can be efficiently inserted into a predetermined position of the outer cylindrical portion of the lower drain member. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is a side view showing a gutter piping structure provided with a siphon drain member according to a first embodiment of the present invention. [Figure 2]2A and 2B are diagrams illustrating an outline of a siphon drain member according to the first embodiment. [Figure 3] FIG. 2 is a perspective view illustrating details of a siphon drain member according to the first embodiment. [Figure 4] FIG. 2 is a side view showing an assembled state, illustrating the schematic configuration of the siphon drain member according to the first embodiment. [Figure 5] FIG. 2 is an exploded side view illustrating the schematic configuration of the siphon drain member according to the first embodiment. [Figure 6] FIG. 1 is a cross-sectional view of a different diameter elbow that can be applied to a gutter piping structure. [Figure 7] FIG. 10 is a cross-sectional view of a different diameter tee that can be applied to a gutter piping structure. [Figure 8] FIG. 10 is a side view illustrating a first modified example of the gutter piping structure. [Figure 9] FIG. 10 is a side view illustrating a second modified example of the gutter piping structure. [Figure 10] FIG. 10 is a cross-sectional view of a third elbow of the gutter piping structure shown in FIG. 9. [Figure 11] FIG. 2 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of the siphon drain member according to the first embodiment are disassembled. [Figure 12] FIG. 3 is a cross-sectional view showing an exploded state of a lower drain member of the siphon drain member according to the first embodiment. [Figure 13] 10 is a cross-sectional view illustrating an example in which an inner cylindrical portion of an upper drain member according to the first embodiment is guided toward the inner periphery of a second outer cylindrical portion. FIG. [Figure 14] 10 is a cross-sectional view illustrating an example in which an inner peripheral thread portion of a second outer cylinder portion is screwed into an outer peripheral thread portion of an upper drain member according to the first embodiment. FIG. [Figure 15] FIG. 10 is a side view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a second embodiment of the present invention are attached to an eaves gutter. [Figure 16] 16 is a side view showing the lower drain member of FIG. 15 disassembled into a first outer cylindrical portion and a second outer cylindrical portion. FIG. [Figure 17]FIG. 10 is a cross-sectional view showing a lower drain member according to a second embodiment. [Figure 18] 18 is a cross-sectional view showing the lower drain member of FIG. 17 disassembled into a first outer cylindrical portion and a second outer cylindrical portion. FIG. [Figure 19] FIG. 10 is a cross-sectional view showing a state in which a first elbow is connected to a spigot of a first outer cylinder portion in a lower drain member according to a second embodiment. [Figure 20] FIG. 10 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a third embodiment of the present invention are disassembled. [Figure 21] FIG. 10 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a fourth embodiment of the present invention are disassembled. [Figure 22] FIG. 10 is a perspective view of an upper drain member of a siphon drain member according to a first modified example, viewed obliquely from below. [Figure 23] FIG. 10 is a side view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a second modified example are disassembled. [Figure 24] FIG. 10 is a side view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a second modified example are attached to an eaves gutter. [Figure 25] FIG. 11 is a side view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to a third modified example are disassembled. [Figure 26] FIG. 11 is a side view showing a state in which the first locking portion and the second locking portion according to the third modified example are locked together. [Figure 27] FIG. 11 is a bottom view of an upper drain member according to a fourth modified example. [Figure 28] 28 is a cross-sectional view taken along the line AA shown in FIG. 27. [Figure 29] 28 is a cross-sectional view taken along line BB shown in FIG. 27. [Figure 30] FIG. 13 is a bottom view of an upper drain member according to a fifth modified example. [Figure 31] FIG. 31 is a cross-sectional view taken along the line AA shown in FIG. 30. [Figure 32]FIG. 31 is a cross-sectional view taken along the line BB shown in FIG. 30. [Figure 33] FIG. 1 is a cross-sectional view showing a drain member of the prior art. [Figure 34] FIG. 34 is an exploded perspective view illustrating the screw structure of the siphon drain member of FIG. 33. [Figure 35] 34 is a cross-sectional view illustrating a problem that occurs when assembling the drain member of FIG. 33. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0039] First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view illustrating a gutter piping structure including a siphon drain member (drain member) according to a first embodiment of the present invention. FIG. 2 is a view illustrating an outline of the siphon drain member according to the first embodiment. FIG. 3 is a perspective view illustrating the details of the siphon drain member according to the first embodiment. FIG. 4 is a side view illustrating the general configuration of the siphon drain member according to the first embodiment in an assembled state. FIG. 5 is a side view illustrating the general configuration of the siphon drain member according to the first embodiment in an exploded state. In the drawings, reference numeral 1 denotes the gutter piping structure (piping structure), reference numeral 10 denotes the gutter, reference numeral 11 denotes the bottom plate, reference numeral 12 denotes the side plate, and reference numeral 11H denotes the pilot hole. Reference numeral 100 denotes the siphon drain member (drain member), reference numeral 110 denotes the lower drain member, reference numeral 120 denotes the upper drain member, and reference numeral 150 denotes the siphon portion. Note that the shapes and the like are emphasized in the drawings to make the explanation easier to understand, and the dimensional relationships and the like in the drawings are not necessarily consistent.

[0040] As shown in Figure 1, the gutter piping structure (piping structure) 1 includes, for example, an eaves gutter 10, a siphon drain member (drain member) 100 attached to a circular pilot hole 11H formed in the bottom plate 11 of the eaves gutter 10, a first elbow 20 connected to the underside of the siphon drain member 100, a nominal gutter 24 connected to the downstream side of the first elbow 20, a second elbow 25 connected to the downstream side 24B of the nominal gutter 24, and a downspout 30 connected to the downstream side of the second elbow 25.

[0041] 1, 2, 4, and 5, the eaves gutter 10 includes, for example, a bottom plate 11 and side plates 12 extending upward from both widthwise ends of the bottom plate 11, and is formed with a groove-shaped cross section when viewed along the longitudinal direction. In addition, the bottom plate 11 is formed with a pilot hole 11H that is circular in plan view and penetrates the bottom plate 11 in the thickness direction. 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 (not shown) of the roof.

[0042] In this embodiment, the eaves gutter 10 is an extrusion molded product made of synthetic resin such as hard vinyl chloride resin, ABS, or AES. The material from which the eaves gutter 10 is made can be set arbitrarily, and is not limited to synthetic resin, but may be made from, for example, an extruded metal product.

[0043] Furthermore, when the eaves gutter 10 is made of synthetic resin, it is preferable that the linear expansion coefficient be 2.0 x 10-5 / °C or less to prevent expansion and contraction due to heat. It is preferable to reduce the linear expansion coefficient by inserting a low-elasticity sheet such as a stretched PET resin sheet or an 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 that makes up the eaves gutter 10 itself.

[0044] In addition, the eaves gutter 10 may be applied to a large-diameter downspout having 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 capable of carrying rainwater at a flow rate of, for example, 4 liters / sec or more and 20 liters / sec or less.

[0045] 1 to 5, the siphon drain member (drain member) 100 includes, for example, a lower drain member 110, an upper drain member 120, and a siphon section 150 disposed above the upper drain member 120, and is attached to the eaves gutter 10. Specifically, the lower drain member 110 is disposed on the lower surface 11B side of the bottom plate 11 of the eaves gutter 10, and the upper drain member 120 is disposed on the upper surface 11A side of the bottom plate.

[0046] The material for forming the siphon drain member 100 can be selected arbitrarily. In this embodiment, the siphon drain member 100 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 by casting cast iron, stainless steel, or aluminum. The lower drain member 110 and the upper drain member 120 will be described in detail later. The siphon section 150 will be described below with reference to FIGS.

[0047] 2 to 5, the siphon part 150 includes, for example, a cover member 151, a vertical rib 155 that connects the upper drain member 120 and the cover member 151, a gripping rib 156, and an induction guide 157. The siphon part 150 is disposed above the upper drain member 120.

[0048] 2 and 3, the cover member 151 is, for example, a disk-shaped member that is circular in plan view and is disposed above the upper drain member 120. The cover member 151 is coaxial with the pipe axis of the upper drain member 120. The portion formed between the outer peripheral edge 151A of the cover member 151 and the outer peripheral edge 121C of the upper drain member 120 constitutes an inflow opening 100A through which rainwater W accumulated in the eaves gutter 10 flows into the drop opening portion 121H.

[0049] The inlet opening 100A refers to the space between the outer peripheral edge 151A of the cover member 151 and the upper surface 11A of the eaves gutter 10, or the space between the upper flange portion 121 of the upper drain member 120, in a direction perpendicular to the horizontal plane. For example, if the outer peripheral edge 151A of the cover member 151 is larger than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A will be the portion formed between the outer peripheral edge 151A of the cover member 151 and the upper surface 11A of the eaves gutter 10, and if the outer peripheral edge 151A of the cover member 151 is smaller than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A will be the portion formed between the outer peripheral edge 151A of the cover member 151 and the upper surface 121A of the upper flange portion 121.

[0050] The size, height, and shape of the cover member 151, which will be described later, are adjusted so that the area of ​​the inflow opening 100A is larger than the opening area A1 of the drop opening 121H described above. In this embodiment, the area of ​​the inflow opening 100A can be calculated by multiplying the circumference of the circular cover member 151, i.e., the length of the outer circumferential edge 151A, by the height H of the cover member 151.

[0051] The cover member 151 is supported by the upper drain member 120 in a state where it is supported from below by a plurality of vertical ribs 155 . As described above, the cover member 151 is disposed inside the eaves gutter 10, positioned above and spaced apart from the drop opening 121H, and forms an inlet opening 100A for allowing rainwater W to flow into the drop opening 121H on the upper surface 11A of the eaves gutter 10 below the cover member 151. Preferably, the cover member 151 is set at a height H of 10 to 60 mm upward from the upper surface 11A of the eaves gutter 10.

[0052] The size of lid member 151 in a plan view can be set arbitrarily, but it is preferable that it be disposed so as to close the opening of drop opening portion 121H and be set larger than the opening area A1 of drop opening portion 121H. Alternatively, it may be set equal to or smaller than opening area A1 of drop opening portion 121H. Furthermore, for example, a through-hole may be formed in the cover member 151 in the vertical direction, penetrating from the top surface to the drop opening portion 121H.

[0053] Furthermore, it is more preferable that the height H of the lid member 151 be set at a position 30 to 40 mm above the bottom plate 11 of the eaves gutter 10 (specifically, the upper surface 11A of the bottom plate 11), and that the diameter of the lid member 151 be set at 150 to 200% of the opening outer diameter R1 of the downspout portion 121H. If the diameter of the lid member 151 is smaller than 150% of the opening outer diameter R1 of the downspout portion 121H, the water level in the eaves gutter 10 will be lower than the lid member 151, and the lid member 151 may not come into contact with the inflowing water. Furthermore, if the diameter of the lid member 151 exceeds 200%, the proportion of the water flowing in from the inlet opening 100A that collides with the lid member 151 increases, and the water level in the eaves gutter 10 may become too high above the lid member 151, possibly reducing siphon performance.

[0054] For the siphon action to occur, the water level in the eaves gutter 10 must be higher than the inlet opening 100A, and the height H of the cover member 151 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 151 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 lowest height of the side panel 12 of the eaves gutter 10 from the bottom panel 11.

[0055] Furthermore, the inner diameter (opening outer diameter) R1 of the inner cylinder inner circumferential hole 122H of the inner cylinder portion 122 suitable for providing the lid member 151 set at the position described above is preferably 50 mm or more and 170 mm or less, and more preferably 70 mm or more and 170 mm or less. That is, by setting the opening outer diameter R1 of the drop port portion 121H to the lower limit of 50 mm or more, a large amount of wastewater generated in the siphon portion (siphon drain member 100) 50 can be smoothly discharged. Furthermore, by setting the upper limit at 170 mm or less, the fit is reduced, preventing the joints and supports from becoming larger.

[0056] 2 to 5, the cover member 151 is provided with gripping ribs 156 that protrude upward from the upper surface 151B and are spaced apart in the circumferential direction. By gripping these gripping ribs 156, the rotation operation for tightening the siphon drain member 100 can be easily performed.

[0057] Furthermore, gripping rib 156 is made up of rib main body 156A extending in the circumferential direction and extension portions 156B protruding outward from both ends of rib main body 156A. When attaching siphon drain member 100 to first elbow 20, for example, a rod-shaped member can be engaged between circumferentially adjacent gripping ribs 156, 156 and then rotated to tighten the members. Furthermore, since gaps are formed between the gripping ribs 156, 156, debris such as fallen leaves in the eaves gutter 10 can easily pass through, preventing it from becoming tangled.

[0058] 3 to 5, the guide guides 157 are provided in the center of the underside 151C of the lid member 151 in a plan view, with a plurality of guide guides 157 having curves that gradually extend downward as they approach the drain axis O (the center of the lid), and extending radially in the radial direction from the drain axis O. The guide guides 157 are intended to guide rainwater W in the eaves gutter 10 from the inlet opening 100A to the drop opening (the opening of the drop opening 121H). The induction guide 157 may be formed by a funnel-shaped or cylindrical wall portion with holes formed at the top and bottom ends.

[0059] As shown in Fig. 3, the vertical ribs 155 connect the upper surface 121A of the upper drain member 120 to the outer periphery of the lower surface 151C of the cover member 151. In other words, the cover member 151 is supported from below by the multiple vertical ribs 155 and held at a position that ensures a predetermined height H from the upper surface 11A of the eaves gutter 10. These vertical ribs 155 are provided on the inlet opening 100A and are curved and intersect with the radial direction in a plan view. In other words, the vertical ribs 155 have the function of rectifying the rainwater W that flows from the inlet opening 100A into the drop opening 121H.

[0060] In siphon portion 150, the inner diameter of inner circumferential hole 122H of inner cylinder portion 122 and upper surface 123A on the inner surface side to which upper flange portion 121 is connected are tapered or curved, forming a bell-mouth shape. If upper surface (connecting portion) 123A on the inner surface side is curved, the radius of curvature of the cross section in the direction parallel to drain axis O is preferably 5 mm to 20 mm. Note that the connecting portion between upper flange portion 121 and upper surface 123A may be bent upward.

[0061] Next, the operation of the siphon portion 150 of the above-described siphon drain member 100 will be described. 3, in plan view, siphon section 150 closes the opening of downspout section 121H, and even when a large amount of rainwater flows in from inlet opening 100A during heavy rain, downspout 30 becomes full and water-sealed without sucking in air, thereby generating a siphon phenomenon downstream.

[0062] Such a siphon drain member 100 is installed inside the eaves gutter 10 located at the eaves of a rain gutter piping structure 1 attached to a building of a large facility such as a factory or shopping center, and exhibits high drainage function.

[0063] The first elbow 20 is a joint (elbow member, joint member) installed downstream of the siphon drain member (drain member) 100. The first elbow 20 is connected to the lower side of the siphon drain member 100, as shown in FIG. As shown in FIG. 1, the first elbow 20 includes a first socket portion 21, a second socket portion 22, and a curved pipe portion 23 that is curved at approximately 90° in a side view.

[0064] First receiving portion 21 is formed with an inner diameter that allows it to be connected to lower drain member 110 of siphon drain member 100, and as shown in Figure 1, a receiving bottom surface 21A is formed at the connection portion with curved pipe portion 23, the diameter of which decreases toward curved pipe portion 23. This receiving bottom surface 21A abuts against the blank end of the inserted piping, making it possible to secure the relative position with respect to the piping.

[0065] In order to allow the rainwater W flowing in from the first receiving port 21 to flow smoothly without reducing its flow rate, it is preferable that the curved pipe section 23 is formed so that, when viewed in a cross section including the pipe axis (along the pipe axis), the radius of curvature of the outer wall section (the side with the smaller curvature) and the inner wall section is at least 64 mm and smaller than 125 mm. Furthermore, the second receiving portion 22 of the first elbow 20 is connected to the upstream end of a call down pipe 24 .

[0066] The inlet pipe 24 is a member that horizontally guides the rainwater W that flows down from the first elbow 20, and is a straight pipe that extends horizontally to horizontally guide the rainwater W that flows down from the siphon drain member 100. The downstream side is connected to the upper end 30A of the downspout 30 by a second elbow 25.

[0067] Furthermore, it is preferable that the length of the call down pipe 24 from the upstream end to the downstream end 24B of the call down pipe 24 (call down pipe length) be more than 0 m and not more than 1.5 m, more preferably 0.6 m or more and not more than 1.5 m, and even more preferably 0.6 m or more and not more than 1.0 m. By setting the length of the call gutter within the above-mentioned range, the rainwater W flowing down from the first elbow 20 can flow smoothly in a full state. A downstream end 24B of the inlet pipe 24 is connected to a first receiving port of a second elbow 25. The second elbow 25 has a similar configuration to the first elbow 20.

[0068] An upper end portion 30A of a downspout 30 is connected to a second receiving portion of the second elbow 25. The downspout 30 is a member that vertically drains the rainwater W that has flowed down the second elbow 25, and is a straight pipe that extends in the vertical direction. The lower end of the downspout 30 is connected to, for example, a catchment basin (not shown) that is connected to the ground and buried underground. The catchment basin is configured to be connected to a drainage structure such as a sewer pipe via a connecting pipe (not shown).

[0069] The downspout 30 is a straight pipe arranged in the vertical direction along the outer wall of the building, and is a member that allows the rainwater W that flows down from the second elbow 25 to flow downward. The height from the upper end to the lower end of the downspout 30 is, for example, 2.0 m or more, preferably 3.0 m or more, and more preferably 4.0 m or more. By keeping the length (height dimension) of the downspout within the above range, the siphon effect in the downspout 30 can be satisfactorily generated and maintained. As the downspout length increases, the amount of rainwater W draining down to the lower end increases, and the rainwater W flows forcefully into the catch basin.

[0070] In the gutter 1 assembled in this manner, rain falling on the roof flows into the siphon drain member 100 provided in the eaves gutter 10 through the inlet opening 100A, passes through the drop-off portion 121H, flows through the first elbow 20, the outlet gutter 24, the second elbow 25 and then flows down into the downspout 30. Then, the rainwater W that flows from the inlet pipe 24 into the downspout 30 flows down into a drain pipe (not shown) buried underground. At this time, the downstream side of the siphon drain member 100 is filled with water and sealed, so the rainwater flows down the downspout 30, filling it with water, causing a siphon phenomenon in the drop opening 121H, the inlet pipe 24, and the downspout 30, and causing the rainwater to be forcefully drained from the downspout 30 into the drain pipe (not shown).

[0071] Here, the second elbow 25 may have a configuration in which the first and second sockets have the same diameter. However, as shown in FIG. 6, a second elbow 25A (different-diameter elbow) in which the diameter of the first socket 26 and the diameter of the second socket 27 are different may also be used. The second elbow 25A includes a curved pipe portion 28. The curved pipe portion 28 connects the first socket 26 and the second socket 27. When the curved pipe portion 28 is viewed in cross section on a plane including the pipe axis of the curved pipe portion 28, the curvature of the inner peripheral portion and the outer peripheral portion of the curved pipe portion 28 gradually change and become smaller. At this time, the radii of curvature of the inner peripheral portion and the outer peripheral portion of the curved pipe portion 28 gradually increase. The diameter of the second elbow 25A increases from upstream to downstream.

[0072] It is preferable that the nominal diameter of the second socket 27 (larger diameter side socket, downstream side socket) of the second elbow 25A be at least one size larger than the nominal diameter of the first socket 26 (smaller diameter side socket, upstream side socket). For example, the nominal diameter of the first socket 26 may be 75 (outer diameter 89 mm) or 100 (outer diameter 114 mm). The nominal diameter of the second socket 27 may be 100 (outer diameter 114 mm) or 125 (outer diameter 140 mm).

[0073] Furthermore, the joint connecting the inlet pipe 24 and the downspout 30 is not limited to an elbow. For example, a tee 25B as shown in FIG. 7 may connect the inlet pipe 24 and the downspout 30. The tee 25B includes a third receptacle 29 in addition to a first receptacle 26 and a second receptacle 27. The second receptacle 27 and the third receptacle 29 are connected through a straight pipe 29a. The curved pipe portion 28 extends laterally from the straight pipe 29a. In the tee 25B, it is preferable to provide a lid (not shown) on the third receptacle 29. The lid is detachable from the third receptacle 29. The third receptacle 29 functions as a cleaning port. Note that a downspout that drains rainwater from a higher position may be connected without providing a lid. 7 is a different diameter tee in which the diameter of first receiving port 26 is different from the diameter of second receiving port 27. However, in tee 25B, first receiving port 26 and second receiving port 27 may have the same diameter.

[0074] In this way, employing a different diameter elbow as the second elbow 25A or a different diameter tee as the tee 25B is particularly effective for a gutter piping structure 1A in which a junction joint 31 (junction portion) is provided in the downspout 30, as shown in Fig. 8. The junction joint 31 is provided midway along the height of the downspout 30. The junction joint 31 is, for example, a tee. At the junction joint 31, rainwater flowing down the downspout 30 is joined with rainwater from another downspout 10A. When rainwater from other rain gutters 10A joins at a midpoint in downspout 30, as in gutter piping structure 1A, if the capacity of downspout 30 is small, downspout 30 is likely to fill up with water, and there is a risk that the rainwater will not be able to join even if it tries to at junction joint 31. Therefore, as described above, by using a different diameter elbow (second elbow 25A) or a different diameter tee (tee 25B) and increasing the capacity of downspout 30 (enlarging the diameter of downspout 30), there will be some leeway in the allowable flow rate in downspout 30, and the rainwater will be able to join reliably.

[0075] In the gutter piping structure 1A shown in FIG. 8, rainwater flowing through the downspout 30 is drained into the rainwater manhole 160. The downspout 30 and the rainwater manhole 160 are connected via a third elbow 161 and a horizontal pipe 162. The lower end of the downspout 30 is buried underground. The third elbow 161 is connected to the lower end of the downspout 30. A first end of the horizontal pipe 162 is connected to the third elbow 161. A second end of the horizontal pipe 162 is disposed within the rainwater manhole 160. The third elbow 161 and the horizontal pipe 162 constitute the drainage pipe described above. By using a different diameter elbow as the second elbow 25A, rainwater flowing inside the downspout 30 does not become full and the flow rate is slowed. This prevents water from splashing out of the rainwater manhole 160.

[0076] Here, as in the gutter piping structure 1B shown in Fig. 9, the third elbow 161A may be a variable-diameter elbow. As shown in Figs. 9 and 10, the third elbow 161A, like the second elbow 25A, has a first socket 26, a second socket 27, and a curved pipe portion 28. The first socket 26 is connected to the lower end of the downspout 30. The second socket 27 is connected to the first end of the horizontal pipe 162. In this case, the flow velocity inside the third elbow 161A is slowed down. This prevents water from splashing out of the rainwater inlet 160. In the gutter piping structures 1A and 1B, both the second elbow 25A and the third elbow 161 may be different diameter elbows, but it is difficult to use a tee for the third elbow 161A because the third elbow 161A is buried underground.

[0077] Next, the lower drain member 110 and the upper drain member 120 that constitute the siphon drain member 100 will be described with reference to FIGS. Fig. 11 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of the siphon drain member according to the first embodiment are disassembled. Fig. 12 is a cross-sectional view showing a state in which the lower drain member of the siphon drain member according to the first embodiment is disassembled. Fig. 11 is a simplified view in which the siphon portion of the siphon drain member is omitted.

[0078] As described above, the siphon drain member (drain member) 100 includes the lower drain member 110, the upper drain member 120, and the siphon portion 150 disposed above the upper drain member 120.

[0079] As shown in FIGS. 4 to 12, the lower drain member 110 includes a lower flange portion 111, a first outer cylindrical portion 112, a second outer cylindrical portion 113, and a connecting portion 114, for example. The lower flange portion 111 is disposed on the lower surface 11B of the eaves gutter 10 (specifically, the bottom plate 11) and is bonded to the lower surface 11B. Specifically, the lower flange portion 111 has, for example, a circular outer shape in plan view, and a circular receiving hole 111H is formed on the inner periphery. That is, the lower flange portion 111 is formed from a flat plate that is ring-shaped in plan view. Furthermore, the lower flange portion 111 has, for example, an upper surface 111A on the outer periphery that is formed as a flat surface. The upper surface 111A of the lower flange portion 111 is bonded to the lower surface 11B when the lower flange portion 111 is disposed on the lower surface 11B of the bottom plate 11 of the eaves gutter 10. Note that a recess into which an adhesive is applied may be formed in the upper surface 111A. In this case, the adhesive is more likely to remain in the recess, and a large amount of adhesive is retained between the upper surface 111A and the lower surface 11B.

[0080] The first outer cylinder portion 112 is formed below the lower flange portion 111 and extends downward from the inner circumferential end of the lower flange portion 111. The first outer cylinder portion 112 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while attached to the eaves gutter 10. Also, a first outer cylinder inner circumferential hole 112H is formed inside the first outer cylinder portion 112, penetrating vertically.

[0081] The second outer cylinder portion 113 is disposed inside the first outer cylinder portion 112 (i.e., inside the first outer cylinder inner peripheral hole 112H). The second outer cylinder portion 113 is formed, for example, in a cylindrical shape centered on the tube axis O1, and extends in the vertical direction while connected to the first outer cylinder portion 112. Also, inside the second outer cylinder portion 113, a second outer cylinder inner peripheral hole 113H is formed that penetrates vertically.

[0082] The second outer cylindrical portion 113 has an inner peripheral thread portion (inner peripheral engagement portion) 115 provided on its inner peripheral surface (inner surface). The inner peripheral thread portion 115 is formed on the inner peripheral surface of the second outer cylindrical portion 113, and various known shapes are applicable. Specifically, the inner peripheral thread portion 115 may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction. The inner peripheral thread portion 115 is threadedly engaged with an outer peripheral thread portion 125, which will be described later.

[0083] The second outer cylinder portion 113 also includes an insertion guide portion 116 and a recess 117. The insertion guide portion 116 is configured by a lower guide sleeve that extends cylindrically upward from the upper end of the inner peripheral thread portion 115 of the second outer cylinder portion 113. Hereinafter, the insertion guide portion 116 may also be referred to as the "lower guide sleeve 116." The role of the lower guide sleeve 116 will be explained later. In this way, the lower guide sleeve 116 can be configured simply by extending cylindrically upward from the upper end of the inner peripheral thread portion 115 of the second outer cylindrical portion 113. This allows the lower guide sleeve 116 to be configured in a simple shape. The lower guide sleeve 116 is set at a height such that the upper end does not come into contact with the upper drain member 120 when the lower drain member 110 and the upper drain member 120 are attached.

[0084] The recesses 117 are provided, for example, four at 90° intervals in the circumferential direction, so as to be recessed upward at the lower end 113T of the second outer cylinder portion 113. The recesses 117 are tool mounting recesses into which a tool is mounted from below. Hereinafter, the recesses 117 may also be referred to as "tool mounting recesses 117." The positions and number of tool mounting recesses 117 can be set arbitrarily. Furthermore, the vertical position of the upper bottom surface 117A of the tool mounting recesses 117 can be set arbitrarily, but it is preferable that they be formed below the lower end of the first outer cylinder portion 112 and the lower end of the inner cylinder portion 122. The role of the tool mounting recesses 117 will be explained later.

[0085] Furthermore, the lower end of second outer cylinder portion 113 is formed as a spigot 113A. For example, first socket portion 21 (see FIG. 1) of first elbow 20 is fitted into spigot 113A of second outer cylinder portion 113. In this way, first socket portion 21 is connected to spigot 113A.

[0086] The connecting portion 114 is composed of an engaging protrusion portion (engaged portion) 118 provided on the inner surface (inner surface) of the first outer tube portion 112 and an engaging recess portion (engaging portion) 119 provided on the outer surface (outer surface) of the second outer tube portion 113. The engagement protrusion 118, for example, protrudes in an annular shape radially inward from the inner peripheral surface of the first outer cylindrical portion 112. The engagement recess 119 is provided, for example, on the outer peripheral surface 119B of the annular protrusion 119A. The annular protrusion 119A protrudes in an annular shape radially outward from the outer peripheral surface of the second outer cylindrical portion 113. The engagement recess 119 is formed in an annular shape so as to be recessed radially inward from the outer peripheral surface 119B. When the engaging protrusion 118 is engaged (fitted) into the engaging recess 119, the first outer cylinder portion 112 and the second outer cylinder portion 113 are connected by the connecting portion 114.

[0087] As shown in Figure 11, the upper drain member 120 includes, for example, an upper flange portion 121 arranged on the upper surface 11A of the bottom plate 11 and having a drop portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion 121 and extending downward, an inner tube reduced diameter portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and reducing in diameter as it extends downward, and an outer peripheral thread portion (outer peripheral engagement portion) 125 formed on the outer surface of the inner tube portion 122. Then, the inner cylindrical portion 122 of the upper drain member 120 is inserted into the second outer cylindrical portion 113 of the lower drain member 110, and the outer peripheral threaded portion 125 and the inner peripheral threaded portion 115 are screwed together to form the siphon drain member 100.

[0088] Upper flange portion 121 is formed, for example, in a circular outer shape in a plan view, and has drop opening portion 121H (drop opening portion 121H in siphon portion 150) that is also circular in a plan view formed on the inner periphery. In other words, upper flange portion 121 is formed in the shape of a ring-shaped flat plate in a plan view. The lower surface 121B of the upper flange portion 121 is disposed on the upper surface 11A of the bottom plate 11 of the eaves gutter .

[0089] In addition, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface formed on the outer periphery, and a positioning step portion 126 consisting of a cylindrical portion that protrudes downward along the tube axis O2 formed on the inner periphery of the flat surface. The positioning step 126 comes into contact with the inner peripheral surface of the pilot hole 11H of the eaves gutter 10, thereby enabling the upper drain member 120 to be positioned relative to the pilot hole 11H. As shown in FIG. 3, the upper surface 121A of the upper flange portion 121 is configured as a gently curved portion.

[0090] The inner cylinder portion 122 is formed, for example, in a cylindrical shape that can be inserted into the second outer cylinder portion 113 with the pipe axis O2 as its center, and extends in the vertical direction while attached to the eaves gutter . An inner cylindrical hole 122H that penetrates vertically is formed inside the inner cylindrical portion 122. An outer peripheral thread portion 125 is formed on the outer peripheral surface of the inner cylindrical portion 122.

[0091] As shown in FIG. 11, the inner cylinder reduced diameter portion 123 connects the upper flange portion 121 and the upper end portion of the inner cylinder portion 122 by decreasing in diameter as it extends downward. In this embodiment, the upper surface 123A of the inner cylinder reduced diameter portion 123 forms the flow path surface from the drop opening portion 121H of the siphon portion 150 to the inner cylinder inner peripheral hole 122H.

[0092] In this embodiment, the outer circumferential surface of the inner tube tapered portion 123 is a continuously tapered outer circumferential surface that continuously tapers to the outer circumferential surface of the inner tube portion 122. Specifically, the outer circumferential surface of the inner tube tapered portion 123 is formed into a smooth shape in a cross section including the tube axis O2, with a gentle curve that concaves inward to the upper end of the inner tube portion 122. In other words, no steps are formed on the outer circumferential surface of the inner tube tapered portion. Note that the continuously tapered outer circumferential surface may be formed by straight lines or a combination of straight lines and curves. It is possible to arbitrarily determine whether or not to form a continuously tapered outer circumferential surface on the outer circumferential surface of the inner tube tapered portion, and a configuration without a continuously tapered outer circumferential surface is also possible.

[0093] The outer peripheral thread portion 125 is formed on the outer peripheral surface of the inner cylindrical portion 122. Note that the outer peripheral thread portion 125 may have any of various known shapes that can be threadedly engaged with the inner peripheral thread portion 115, and may be, for example, formed at intervals in the circumferential direction or formed continuously in the circumferential direction.

[0094] Next, an example of a procedure for attaching the above-described siphon drain member 100 to the eaves gutter 10 will be described. First, as shown in FIGS. 4, 5 and 11, a pilot hole 11H for attaching the siphon drain member 100 is formed in the bottom plate 11 of the eaves gutter 10. Next, for example, the upper drain member 120 is advanced into the eaves gutter 10, the inner tube portion 122 is inserted into the pilot hole 11H of the eaves gutter 10 and protrudes downward, and the step portion 126 of the upper flange portion 121 is inserted into the pilot hole 11H of the bottom plate 11 of the eaves gutter 10 and fixed. For example, adhesive or packing is attached to the lower surface 121B of the upper flange portion 121.

[0095] Next, adhesive is applied to the upper surface 111A of the lower flange portion 111 and the lower surface 121B of the upper flange portion 121. In this state, the bottom surface of the eaves gutter 10 is bonded to the upper surface 111A of the lower flange portion 111 so that the upper surface 111A of the lower flange portion 111 surrounds the pilot hole 11H of the eaves gutter 10, and the inner cylinder portion 122 of the upper drain member 120 is inserted into the pilot hole 11H from inside the eaves gutter 10 and fitted with the second outer cylinder portion 113 of the lower drain member 110. Alternatively, the upper drain member 120 is inserted into the second outer cylinder portion 113 of the lower drain member 110. In this state, the outer peripheral thread portion 125 and the inner peripheral thread portion 115 are screwed together to a predetermined position. In this state, a construction tool (not shown) is inserted into the tool attachment recess 117, and the second outer cylindrical portion 113 is continued to be rotated using the inserted construction tool. The second outer cylindrical portion 113 is pushed into a predetermined position using the construction tool, and the bottom surface of the eaves gutter around the pilot hole 11H of the eaves gutter 10 is sandwiched between the upper surface 111A of the lower flange portion 111 and the lower surface 121B of the upper flange portion 121, thereby fixing the siphon drain member 100 to the bottom surface of the eaves gutter 10. This ensures that the outer peripheral thread portion 125 and the inner peripheral thread portion 115 are securely screwed together, thereby enabling, for example, the upper drain member 120 and the lower drain member 110 to be securely fixed to the bottom plate 11 of the eaves gutter 10.

[0096] An example of threading the outer peripheral thread portion 125 of the upper drain member 120 and the inner peripheral thread portion 115 of the second outer cylinder portion 113 will now be described in detail with reference to FIGS. Fig. 13 is a cross-sectional view illustrating an example in which the inner cylindrical portion of the upper drain member according to the first embodiment is guided toward the inner peripheral side of the second outer cylindrical portion. Fig. 14 is a cross-sectional view illustrating an example in which the inner peripheral thread portion of the second outer cylindrical portion is screwed into the outer peripheral thread portion of the upper drain member according to the first embodiment.

[0097] 13 and 14, in the siphon drain member 100 according to the first embodiment, the second outer cylindrical portion 113 has a lower guide sleeve 116 that extends cylindrically upward from the upper end of the inner circumferential thread portion 115. Therefore, when the lower drain member 110 is attached to the upper drain member 120 from below the bottom plate 11 as indicated by arrow A, the lower end of the upper drain member 120 (i.e., the lower end of the inner cylindrical portion 122) can be brought into contact with the lower guide sleeve 116 of the second outer cylindrical portion 113. Therefore, the inner cylindrical portion 122 of the upper drain member 120 can be guided toward the inner circumferential side of the second outer cylindrical portion 113 (i.e., the inner circumferential hole 113H of the second outer cylindrical portion).

[0098] This prevents the inner peripheral thread portion 115 of the second outer cylindrical portion 113 from being fitted into the inner cylindrical portion 122 of the upper drain member 120 while remaining tilted. Therefore, the second outer cylindrical portion 113 of the lower drain member 110 can be smoothly fitted into the inner cylindrical portion 122 of the upper drain member 120. As a result, the inner peripheral thread portion 115 of the second outer cylindrical portion 113 can be smoothly screwed into the outer peripheral thread portion 125 of the upper drain member 120.

[0099] According to the siphon drain member 100 of the first embodiment, as shown in FIG. 11, a positioning step portion 126 is formed on the lower surface 121B of the upper flange portion 121, so that the siphon drain member 100 can be attached to the eaves gutter 10 accurately and efficiently.

[0100] 13 and 14 have described an example in which the second outer cylinder portion 113 is fitted into the inner cylinder portion 122 of the upper drain member 120 with the upper drain member 120 fixed to the bottom plate 11. However, similar actions and effects can be obtained when the inner cylinder portion 122 of the upper drain member 120 is inserted into the second outer cylinder portion 113 with the lower drain member 110 fixed to the bottom plate 11.

[0101] As described above, according to the gutter piping structure 1 and the siphon drain member 100 of the first embodiment, the lower drain member 110 is provided with the first outer tubular portion 112 and the second outer tubular portion 113. Furthermore, the lower guide sleeve 116 extends cylindrically upward from the upper end of the inner circumferential thread portion 115 of the second outer tubular portion 113. Therefore, when the lower drain member 110 is attached to the upper drain member 120, the lower end of the upper drain member 120 (i.e., the lower end of the inner tubular portion 122) can be brought into contact with the lower guide sleeve 116 of the second outer tubular portion 113. This allows the inner tubular portion 122 of the upper drain member 120 to be guided toward the inner circumferential side of the second outer tubular portion 113. Therefore, the second outer tubular portion 113 of the lower drain member 110 can be smoothly fitted into the inner tubular portion 122 of the upper drain member 120. Alternatively, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the second outer cylindrical portion 113 of the lower drain member 110 .

[0102] The lower drain member 110 is also provided with a first outer cylinder portion 112 and a second outer cylinder portion 113. This makes it easy to match the color of the first outer cylinder portion 112 with the color of the lower surface 11B of the eaves gutter 10, for example. This allows the siphon drain member 100 and the eaves gutter 10 to have a neat and tidy appearance.

[0103] Furthermore, the lower drain member 110 is provided with a first outer tubular portion 112 and a second outer tubular portion 113, and the first outer tubular portion 112 and the second outer tubular portion 113 are connected by a connecting portion 114. The connecting portion 114 is connected by engaging (fitting) an annular engaging protrusion 118 with an annular engaging recess 119. Therefore, the first outer tubular portion 112 and the second outer tubular portion 113 can be connected by the connecting portion 114 so as to be rotatable relative to each other. Further, the second outer cylinder portion 113 is provided with an inner peripheral thread portion 115, which is threadedly engaged with an outer peripheral thread portion 125 of the upper drain member 120. Therefore, for example, it is possible to rotate the inner peripheral thread portion 115 of the second outer cylinder portion 113 relative to the outer peripheral thread portion 125 and to rotate the second outer cylinder portion 113 relative to the first outer cylinder portion 112.

[0104] Here, the lower end of the second outer cylinder portion 113 is a spigot 113A, and the first socket portion 21 of the first elbow 20 is connected to the spigot 113A by fitting. This makes it possible to change the orientation of the first elbow 20 by rotating the second outer cylinder portion 113, making it easier to temporarily align the orientation of the first elbow 20.

[0105] Hereinafter, gutter piping structures and siphon drain members according to second to fourth embodiments of the present invention will be described with reference to Figures 15 to 21. In the gutter piping structures and siphon drain members according to the second to fourth embodiments, the same or similar members as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

[0106] Second Embodiment Hereinafter, a rain gutter piping structure and a siphon drain member according to a second embodiment of the present invention will be described with reference to Figs. 15 to 19. Fig. 15 is a side view showing a state in which a lower drain member and an upper drain member of a siphon drain member according to the second embodiment are attached to an eaves gutter. Fig. 16 is a side view showing a state in which the lower drain member of Fig. 15 is disassembled into a first outer tubular portion and a second outer tubular portion. Fig. 17 is a cross-sectional view showing a lower drain member according to the second embodiment. Fig. 18 is a cross-sectional view showing a state in which the lower drain member of Fig. 17 is disassembled into a first outer tubular portion and a second outer tubular portion. Fig. 19 is a cross-sectional view showing a state in which a first elbow is connected to a spigot of a first outer tubular portion in a lower drain member according to the second embodiment.

[0107] 15 to 18, reference numeral 200 denotes a siphon drain member (drain member). As shown in Fig. 15 to 18, the siphon drain member (drain member) 200 includes, for example, a lower drain member 210, an upper drain member 120, and a siphon portion (not shown) disposed above the upper drain member 120. That is, the siphon drain member 200 is configured in such a way that the lower drain member 110 of the first embodiment is replaced with a lower drain member 210, and other configurations are the same as those of the siphon drain member 100 of the first embodiment.

[0108] As shown in FIGS. 15 to 18, the lower drain member 210 includes a lower flange portion 111, a first outer cylindrical portion 212, a second outer cylindrical portion 213, and a connecting portion 114, for example. The first outer cylinder portion 212 is formed below the lower flange portion 111 and extends downward from the inner circumferential end of the lower flange portion 111. The first outer cylinder portion 212 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while attached to the eaves gutter 10. Furthermore, a first outer cylinder inner circumferential hole 212H is formed inside the first outer cylinder portion 212, penetrating vertically.

[0109] The lower end of first outer cylinder portion 212 is cylindrically tapered to form spigot 212A. For example, first socket portion 21 of first elbow 20 (see FIG. 19) is fitted into spigot 212A of first outer cylinder portion 212. Spigot 212A and first socket portion 21 are fixed together by, for example, adhesive bonding. This connects first socket portion 21 to spigot 212A.

[0110] The second outer cylinder portion 213 is disposed above the spigot 212A inside the first outer cylinder portion 212 (i.e., inside the first outer cylinder inner circumferential hole 212H). The second outer cylinder portion 213 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while connected to the first outer cylinder portion 212. Also, inside the second outer cylinder portion 213, a second outer cylinder inner circumferential hole 213H is formed that penetrates vertically.

[0111] The second outer cylindrical portion 213 has an inner peripheral thread portion (inner peripheral engagement portion) 215 formed on its inner peripheral surface (inner surface). The inner peripheral thread portion 215 is formed on the inner peripheral surface of the second outer cylindrical portion 213, and various known shapes are applicable. Specifically, the inner peripheral thread portion 215 may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction. The inner peripheral thread portion 215 is threadedly engaged with the outer peripheral thread portion 125 (see FIG. 19) of the upper drain member 120.

[0112] The second outer cylinder portion 213 also includes an insertion guide portion 216. The insertion guide portion 216 is configured as a lower guide sleeve that extends cylindrically upward from the upper end of the inner peripheral thread portion 215 of the second outer cylinder portion 213. Hereinafter, the insertion guide portion 216 may also be referred to as the "lower guide sleeve 216." In this way, the lower guide sleeve 216 can be configured simply by extending cylindrically upward from the upper end of the inner peripheral thread portion 215 of the second outer cylinder portion 213. This allows the lower guide sleeve 216 to be configured in a simple shape. The lower guide sleeve 216 is set at a height such that the upper end does not come into contact with the upper drain member 120 when the lower drain member 210 and the upper drain member 120 are attached. The lower guide sleeve 216 functions similarly to the lower guide sleeve 116 of the first embodiment.

[0113] As in the first embodiment, the first outer cylinder portion 212 and the second outer cylinder portion 213 are connected by a connecting portion 114. The connecting portion 114 is connected by engaging (fitting) an annular engaging protrusion portion 118 with an annular engaging recess 119. Therefore, the first outer cylinder portion 212 and the second outer cylinder portion 213 can be connected by the connecting portion 114 so as to be rotatable relative to each other.

[0114] 19 , the lower end of the first outer cylinder portion 212 forms a spigot 212A, and the first socket portion 21 of the first elbow 20 is connected to the spigot 212A by fitting. Therefore, before the lower flange portion 111 is bonded to the bottom plate 11 of the eaves gutter 10 (specifically, the lower surface 11B of the bottom plate 11), the orientation of the first elbow 20 can be easily temporarily adjusted by, for example, rotating the first outer cylinder portion 212 relative to the second outer cylinder portion 213. After the orientation of the first elbow 20 has been temporarily adjusted, the lower flange portion 111 is bonded to the lower surface 11B of the bottom plate 11 to ensure waterproofing between the lower flange portion 111 and the lower surface 11B of the bottom plate 11.

[0115] As described above, in the gutter piping structure 1 and siphon drain member 200 according to the second embodiment, the lower drain member 210 includes the first outer cylindrical portion 212 and the second outer cylindrical portion 213. Furthermore, the lower guide sleeve 216 extends cylindrically upward from the upper end of the inner peripheral thread portion 215 of the second outer cylindrical portion 213. Therefore, when the lower drain member 210 is attached to the upper drain member 120, the lower end of the upper drain member 120 (i.e., the lower end of the inner cylindrical portion 122) can be brought into contact with the lower guide sleeve 216 of the second outer cylindrical portion 213. This allows the inner cylindrical portion 122 of the upper drain member 120 to be guided toward the inner peripheral side of the second outer cylindrical portion 213. Therefore, the second outer cylindrical portion 213 of the lower drain member 210 can be smoothly fitted into the inner cylindrical portion 122 of the upper drain member 120. Alternatively, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the second outer cylindrical portion 213 of the lower drain member 210.

[0116] In addition, the lower drain member 210 is provided with a first outer tubular portion 212 and a second outer tubular portion 213. Therefore, for example, it is easy to match the color of the first outer tubular portion 212 with the color of the lower surface 11B of the eaves gutter 10. This allows the siphon drain member 200 and the eaves gutter 10 to have a neat and tidy appearance.

[0117] Third Embodiment A rain gutter piping structure and a siphon drain member according to a third embodiment of the present invention will be described below with reference to Fig. 20. Fig. 20 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of the siphon drain member according to the third embodiment are disassembled.

[0118] In Fig. 20, reference numeral 300 denotes a siphon drain member (drain member). As shown in Fig. 20, the siphon drain member (drain member) 300 includes, for example, a lower drain member 310, an upper drain member 120, and a siphon portion (not shown) disposed above the upper drain member 120. That is, the siphon drain member 300 is configured in such a way that the lower drain member 110 of the first embodiment is replaced with a lower drain member 310, and other configurations are the same as those of the siphon drain member 100 of the first embodiment.

[0119] As shown in FIG. 20, the lower drain member 310 includes, for example, a lower flange portion 111, a first outer cylindrical portion 312, a second outer cylindrical portion 313, and a connecting portion 314. The first outer cylinder portion 312 is formed below the lower flange portion 111 and extends downward from the inner circumferential end of the lower flange portion 111. The first outer cylinder portion 312 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while attached to the eaves gutter 10. Also, a first outer cylinder inner circumferential hole 312H is formed inside the first outer cylinder portion 312, penetrating vertically.

[0120] The first outer cylinder portion 312 also has recesses 317. The recesses 317 are provided, for example, four at 90° intervals in the circumferential direction so as to be recessed upward at the lower end 312T of the first outer cylinder portion 312. The recesses 317 are tool mounting recesses into which a tool is mounted from below. Hereinafter, the recesses 317 may also be referred to as "tool mounting recesses 317." The position and number of the tool mounting recesses 317 can be set as desired. Furthermore, the vertical position of the upper bottom surface 317A of the tool mounting recesses 317 can be set as desired, but it is preferable that they be formed below the lower end of the inner cylindrical portion 122 of the upper drain member 120. The tool mounting recesses 317 play the same role as the tool mounting recesses 117 of the first embodiment.

[0121] The second outer cylinder portion 313 is disposed inside the first outer cylinder portion 312 (i.e., inside the first outer cylinder inner peripheral hole 312H). The second outer cylinder portion 313 is formed, for example, in a cylindrical shape centered on the tube axis O1, and extends in the vertical direction while connected to the first outer cylinder portion 312. Also, inside the second outer cylinder portion 313, a second outer cylinder inner peripheral hole 313H is formed that penetrates vertically.

[0122] The second outer cylindrical portion 313 has an inner peripheral thread portion (inner peripheral engaging portion) 315 formed on its inner peripheral surface (inner surface). The inner peripheral thread portion 315 is formed on the inner peripheral surface of the second outer cylindrical portion 313, and various known shapes are applicable. Specifically, the inner peripheral thread portion 315 may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction. The inner peripheral thread portion 315 is threadedly engaged with the outer peripheral thread portion 125 of the upper drain member 120.

[0123] Here, an installation tool (not shown) is inserted into the tool attachment recess 117 of the first outer tubular portion 312, and the first outer tubular portion 312 is rotated by the inserted installation tool. As the first outer tubular portion 312 rotates, the second outer tubular portion 313 rotates together with the first outer tubular portion 312. This allows the outer peripheral thread portion 125 of the upper drain member 120 to be securely screwed into the inner peripheral thread portion 315 of the second outer tubular portion 313. Therefore, for example, the upper drain member 120 and the lower drain member 310 can be securely fixed to the bottom plate 11 of the eaves gutter 10.

[0124] The second outer tube portion 313 also includes an insertion guide portion 316. The insertion guide portion 316 is configured as a lower guide sleeve that extends cylindrically upward from the upper end of the inner peripheral thread portion 315 of the second outer tube portion 313. Hereinafter, the insertion guide portion 316 may also be referred to as the "lower guide sleeve 316." In this way, the lower guide sleeve 316 can be configured simply by extending cylindrically upward from the upper end of the inner peripheral thread portion 315 of the second outer tube portion 313. This allows the lower guide sleeve 316 to be configured in a simple shape. The lower guide sleeve 316 is set at a height such that the upper end does not come into contact with the upper drain member 120 when the lower drain member 310 and the upper drain member 120 are attached. The lower guide sleeve 316 functions similarly to the lower guide sleeve 116 of the first embodiment.

[0125] Furthermore, the lower end of second outer cylinder portion 313 is formed as a spigot 313A. For example, the upper end of downspout 30 or first socket portion 21 (see FIG. 1) of first elbow 20 is fitted into spigot 313A of second outer cylinder portion 313. In this way, first socket portion 21 is connected to spigot 313A.

[0126] The first outer tubular portion 312 and the second outer tubular portion 313 are connected by a connecting portion 314. The connecting portion 314 is composed of a bridge portion that integrally connects the inner surface of the first outer tubular portion 312 and the outer surface of the second outer tubular portion 313. This makes it possible to omit the step of assembling the first outer tubular portion 312 and the second outer tubular portion 313, thereby improving productivity.

[0127] As described above, in the gutter piping structure 1 and siphon drain member 300 according to the third embodiment, the lower drain member 310 includes the first outer tubular portion 312 and the second outer tubular portion 313. Furthermore, the lower guide sleeve 316 extends cylindrically upward from the upper end of the inner circumferential thread portion 315 of the second outer tubular portion 313. Therefore, when the lower drain member 310 is attached to the upper drain member 120, the lower end of the upper drain member 120 (i.e., the lower end of the inner tubular portion 122) can be brought into contact with the lower guide sleeve 316 of the second outer tubular portion 313. This allows the inner tubular portion 122 of the upper drain member 120 to be guided toward the inner circumferential side of the second outer tubular portion 313. Therefore, the second outer tubular portion 313 of the lower drain member 310 can be smoothly fitted into the inner tubular portion 122 of the upper drain member 120. Alternatively, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the second outer cylindrical portion 313 of the lower drain member 310.

[0128] Furthermore, the inner peripheral thread portion 315 of the second outer cylindrical portion 313 is threadedly engaged with the outer peripheral thread portion 125 of the upper drain member 120. Additionally, the first outer cylindrical portion 312 and the second outer cylindrical portion 313 are integrally connected by a connecting portion 314. That is, the first outer cylindrical portion 312 and the second outer cylindrical portion 313 are connected so as not to rotate relative to each other. For example, in this state, the first socket portion 21 (see FIG. 1) of the first elbow 20 is connected to the spigot 313A of the second outer cylindrical portion 313. Even in this case, before the lower flange portion 111 is bonded to the bottom plate 11 (specifically, the lower surface 11B of the bottom plate 11) of the eaves gutter 10, the second outer cylinder portion 313 can be rotated together with the first outer cylinder portion 312 to make it easier to temporarily align the orientation of the first elbow 20. After temporarily aligning the orientation of the first elbow 20, the lower flange portion 111 is bonded to the lower surface 11B of the bottom plate 11 to ensure watertightness between the lower flange portion 111 and the lower surface 11B of the bottom plate 11.

[0129] <Fourth embodiment> A rain gutter piping structure and a siphon drain member according to a fourth embodiment of the present invention will be described below with reference to Fig. 21. Fig. 21 is a cross-sectional view showing a state in which a lower drain member and an upper drain member of the siphon drain member according to the fourth embodiment are disassembled.

[0130] 21, reference numeral 400 denotes a siphon drain member (drain member). As shown in Fig. 21, the siphon drain member (drain member) 400 includes, for example, a lower drain member 410, an upper drain member 120, and a siphon portion (not shown) disposed above the upper drain member 120. That is, the siphon drain member 400 is configured in such a way that the lower drain member 110 of the first embodiment is replaced with a lower drain member 410, and other configurations are the same as those of the siphon drain member 100 of the first embodiment.

[0131] As shown in FIG. 21, the lower drain member 410 includes, for example, a lower flange portion 111, a first outer cylindrical portion 412, a second outer cylindrical portion 413, a connecting portion 414, and a cover 418. The first outer cylinder portion 412 is formed below the lower flange portion 111 and extends downward from the inner circumferential end of the lower flange portion 111. The first outer cylinder portion 412 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while attached to the eaves gutter 10. A first outer cylinder inner circumferential hole 412H that penetrates vertically is formed inside the first outer cylinder portion 412. A lower end 412A of the first outer cylinder portion 412 is connected to a step portion 415A of a cover 418 (described later).

[0132] The second outer cylinder portion 413 is disposed inside the first outer cylinder portion 412 (i.e., inside the first outer cylinder inner peripheral hole 412H). The second outer cylinder portion 413 is formed, for example, in a cylindrical shape centered on the tube axis O1, and extends in the vertical direction while connected to the first outer cylinder portion 412. Furthermore, inside the second outer cylinder portion 413, a second outer cylinder inner peripheral hole 413H is formed that penetrates vertically.

[0133] The second outer cylindrical portion 413 has an inner peripheral thread portion (inner peripheral engaging portion) 415 formed on its inner peripheral surface (inner surface). The inner peripheral thread portion 415 is formed on the inner peripheral surface of the second outer cylindrical portion 413, and various known shapes are applicable. Specifically, the inner peripheral thread portion 415 may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction. The inner peripheral thread portion 415 is threadedly engaged with the outer peripheral thread portion 125 of the upper drain member 120.

[0134] The second outer cylinder portion 413 also includes an insertion guide portion 416. The insertion guide portion 416 is configured as a lower guide sleeve that extends cylindrically upward from the upper end of the inner peripheral thread portion 415 of the second outer cylinder portion 413. Hereinafter, the insertion guide portion 416 may also be referred to as the "lower guide sleeve 416." In this way, the lower guide sleeve 416 can be configured simply by extending cylindrically upward from the upper end of the inner peripheral thread portion 415 of the second outer cylinder portion 413. This allows the lower guide sleeve 416 to be configured in a simple shape. The lower guide sleeve 416 is set at a height such that the upper end does not come into contact with the upper drain member 120 when the lower drain member 410 and the upper drain member 120 are attached. The lower guide sleeve 416 functions similarly to the lower guide sleeve 116 of the first embodiment.

[0135] The first outer cylinder portion 412 and the second outer cylinder portion 413 are connected by a connecting portion 414. The connecting portion 414 is composed of a bridge portion that integrally connects the inner surface of the first outer cylinder portion 412 and the outer surface of the second outer cylinder portion 413. This makes it possible to omit the step of assembling the first outer cylinder portion 412 and the second outer cylinder portion 413, thereby improving productivity.

[0136] The cover 418 is formed so as to cover from the outside the first outer cylinder portion 412 and the second outer cylinder portion 413 protruding downward from the first outer cylinder portion 412. The cover 418 is formed, for example, in a cylindrical shape centered on the pipe axis O1, and extends in the vertical direction while attached to the eaves gutter 10. The cover 418 is arranged so that its upper end 415B covers from the outside the lower flange portion 111, the first outer cylinder portion 412, and the second outer cylinder portion 413 that protrudes downward from the first outer cylinder portion 412. By covering the lower flange portion 111 in particular with the upper end 415B of the cover 418 in this way, the appearance of the siphon drain member 400 and the eaves gutter 10 can be made neat and tidy. Furthermore, for example, it becomes easy to match the color of the cover 418 to the color of the underside 11b of the eaves gutter 10. This makes the siphon drain member 400 and the eaves gutter 10 look even neater.

[0137] Cover 418 is formed so that lower end 415C is cylindrically tapered to form a spigot. Hereinafter, lower end 415C may also be referred to as "spigot 415C." For example, first socket portion 21 (see FIG. 1) of first elbow 20 is fitted into spigot 415C of cover 418. This connects first socket portion 21 to spigot 212A. Furthermore, upper end 415B and spigot 415C of cover 418 are integrally connected by step 415A. Lower end 412A of first outer cylinder portion 412 is connected to step 415A. Therefore, before the lower flange portion 111 is bonded to the bottom plate 11 (specifically, the lower surface 11B) of the eaves gutter 10, it is easy to temporarily align the orientation of the first elbow 20 by, for example, rotating the cover 418 about the outer peripheral thread portion 125 and the inner peripheral thread portion 415. After temporarily aligning the orientation of the first elbow 20, the lower flange portion 111 is bonded to the lower surface 11B of the bottom plate 11 to ensure waterproofing between the lower flange portion 111 and the lower surface 11B of the bottom plate 11.

[0138] The cover 418 may also include recesses 417. The recesses 417 are provided, for example, in four, spaced 90° apart in the circumferential direction so as to be recessed upward at the lower end 415T of the cover 418. The recesses 417 are tool mounting recesses into which a tool is mounted from below. Hereinafter, the recesses 417 may also be referred to as "tool mounting recesses 417." The position and number of tool mounting recesses 417 can be set as desired. Furthermore, the vertical position of upper bottom surface 417A of tool mounting recess 417 can be set as desired, but it is preferable that tool mounting recess 417 be formed below the lower end of inner cylindrical portion 122 of upper drain member 120. Tool mounting recess 417 plays the same role as tool mounting recess 117 of the first embodiment.

[0139] That is, an installation tool (not shown) is inserted into the tool attachment recess 417 of the cover 418, and the inserted installation tool is used to rotate the cover 418. As the cover 418 rotates, the first outer tubular portion 412 and the second outer tubular portion 413 rotate together with the cover 418. This allows the outer peripheral thread portion 125 of the upper drain member 120 to be securely screwed into the inner peripheral thread portion 415 of the second outer tubular portion 413. Therefore, for example, the upper drain member 120 and the lower drain member 410 can be securely fixed to the bottom plate 11 of the eaves gutter 10.

[0140] As described above, in the gutter piping structure 1 and siphon drain member 400 according to the fourth embodiment, the lower drain member 410 includes the first outer tubular portion 412 and the second outer tubular portion 413. Furthermore, the lower guide sleeve 416 extends cylindrically upward from the upper end of the inner circumferential thread portion 415 of the second outer tubular portion 413. Therefore, when the lower drain member 410 is attached to the upper drain member 120, the lower end of the upper drain member 120 (i.e., the lower end of the inner tubular portion 122) can be brought into contact with the lower guide sleeve 416 of the second outer tubular portion 413. This allows the inner tubular portion 122 of the upper drain member 120 to be guided toward the inner circumferential side of the second outer tubular portion 413. Therefore, the second outer tubular portion 413 of the lower drain member 410 can be smoothly fitted into the inner tubular portion 122 of the upper drain member 120. Alternatively, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the second outer cylindrical portion 413 of the lower drain member 410.

[0141] Furthermore, by providing the cover 418 on the lower drain member 410, the upper end 415B of the cover 418 can cover the lower flange portion 111. This allows the siphon drain member 400 and the eaves gutter 10 to have a neat and tidy appearance. Furthermore, it becomes easy to match the color of the cover 418 with the color of the underside 11b of the eaves gutter 10. This allows the siphon drain member 400 and the eaves gutter 10 to look even neater.

[0142] <Modification> Hereinafter, as modifications of the embodiment, siphon drain members and the like of first to third modifications will be described with reference to Figures 22 to 26. Note that in the siphon drain members of the first to fifth modifications, the same or similar parts as those of the embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0143] <First Modification> A siphon drain member according to a first modified example of the present invention will now be described with reference to Fig. 22. Fig. 22 is a perspective view of the upper drain member of the siphon drain member according to the first modified example, viewed obliquely from below. 22, the upper drain member 520 has a rib 521 provided at the intersection between the upper flange portion 121 and the inner cylindrical portion 122. The rib 521 protrudes radially outward from the upper end of the inner cylindrical portion 122. For example, the radially outer edge of the rib 521 extends in a curved shape in the vertical direction so as to follow the outer surface (lower surface) of the bell-mouth shape of the upper surface 123A (see FIG. 3). The rib 521 functions as a guide when inserting the upper drain member 520 into the lower drain member 110 (see FIG. 11) or when fitting the lower drain member 110 into the upper drain member 520, for example.

[0144] A plurality of ribs 521 (four in the illustrated example) are arranged at equal intervals in the circumferential direction on the upper drain member 520. Each rib 521 is plate-shaped with its front and back surfaces facing the circumferential direction. The upper end of each rib 521 is connected to the lower surface of the upper flange portion 121. Each rib 521 protrudes radially outward from the upper drain member 520. The amount by which each rib 521 protrudes radially outward increases from the bottom to the top.

[0145] <Second Modification> A siphon drain member according to a second modified example of the present invention will be described below with reference to Figures 23 and 24. Figure 23 is a side view showing the lower and upper drain members of the siphon drain member according to the second modified example disassembled. Figure 24 is a side view showing the lower and upper drain members of the siphon drain member according to the second modified example attached to an eaves gutter.

[0146] 23 and 24, a siphon drain member (drain member) 600 includes, for example, a first locking portion (inner peripheral engaging portion) 615 in place of the inner peripheral thread portion 115 (see FIG. 11) of the second outer cylinder portion 113 in a lower drain member 610. The first locking portion 615 is a protrusion. The first locking portion 615 has a stepped shape when viewed from the front in the radial direction of the first locking portion 615. Furthermore, siphon drain member 600 includes, for example, second locking portion (outer peripheral engaging portion) 625 in place of outer peripheral thread portion 125 (see FIG. 11) of inner cylindrical portion 122 in upper drain member 620. Second locking portion 625 is a protrusion. Second locking portion 625 has a stepped shape when viewed from the front in the radial direction. When the lower drain member 610 and the upper drain member 620 are rotated in an engaged state, the first locking portion 615 and the second locking portion 625 are locked together. In the example shown in the figure, the first locking portion 615 and the second locking portion 625 mesh with each other. This restricts further rotation of the lower drain member 610 and the upper drain member 620, and the lower drain member 610 and the upper drain member 620 are maintained in an attached state.

[0147] <Third Modification> A siphon drain member according to a third modified example of the present invention will be described below with reference to Figures 25 and 26. Figure 25 is a side view showing the state in which the lower drain member and upper drain member of the siphon drain member according to the third modified example are disassembled. Figure 26 is a side view showing the state in which the first locking portion and the second locking portion according to the third modified example are locked.

[0148] 25 and 26, siphon drain member (drain member) 700 includes, for example, a first locking portion (inner peripheral engaging portion) 715 in place of inner peripheral thread portion 115 (see FIG. 11) of second outer cylinder portion 113 in lower drain member 710. First locking portion 715 is a protrusion. First locking portion 715 has a triangular shape when viewed from the front, that is, when first locking portion 715 is viewed from the radial direction. Furthermore, the siphon drain member 700 is provided with, for example, a second locking portion (outer peripheral engaging portion) 725 in place of the outer peripheral thread portion 125 (see FIG. 11) of the inner cylindrical portion 122 in the upper drain member 720. The second locking portion 725 is a protrusion. When viewed from the front in the radial direction, the second locking portion 725 has a linear shape that is inclined relative to the direction perpendicular to the axis O1 (the circumferential direction). The second locking portion 725 can also be said to have a circumferential strip. A locking piece 725A is provided at the peripheral end of the second locking portion 725, and the first locking portion 715 is locked so as to be able to climb over it. The locking piece 725A has a triangular shape when viewed from the front in the radial direction. When the lower drain member 710 and the upper drain member 720 are rotated in an engaged state, the first locking portion 715 moves circumferentially over the locking piece 725A of the second locking portion 725, and then the two are locked together. This restricts further rotation of the lower drain member 610 and the upper drain member 620, and the lower drain member 710 and the upper drain member 720 are maintained in an attached state. In addition to the second and third modified examples, it is also possible to employ a so-called bayonet structure between the upper and lower drain members as the inner and outer peripheral engaging portions.

[0149] <Other variations> The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0150] For example, in the above embodiment, the drain member is siphon drain member 100 equipped with siphon portion 150, but it is possible to arbitrarily set whether or not the drain member is equipped with siphon portion 150, and the drain member may be configured not to be equipped with siphon portion 150. The same applies to siphon drain members 200, 300, and 400.

[0151] Furthermore, in the above embodiment, an example has been described in which the lower guide sleeve 116 extends upward from the upper end of the second outer cylindrical portion 113 in the lower drain member 110, but this is not limiting. As another example, an upper guide sleeve may extend downward as an insertion guide portion from the lower end of the inner cylindrical portion 122 in the upper drain member 120. Furthermore, a lower guide sleeve may be provided on the second outer cylindrical portion 113 of the lower drain member 110, and an upper guide sleeve may be provided on the inner cylindrical portion 122 of the upper drain member 120. The same applies to the siphon drain members 200, 300, and 400. Furthermore, the rib 521 as described above may be employed.

[0152] Furthermore, in the above embodiment, the upper drain member 120 is described as having the positioning step 126, but whether or not the upper drain member 120 has the positioning step 126 may be set arbitrarily.

[0153] In the above embodiment, the upper flange portion 121 of the upper drain member 120 is formed in a ring-shaped flat plate shape (a shape that extends continuously around the entire circumference) in a plan view. However, as in the upper drain member 120A of a fourth modified example shown in FIGS. 27 to 29, the upper flange portion 121 may be ring-shaped with a portion thereof cut out. There may be at least one notch 127 provided in the upper flange portion 121, and there may be multiple notches. If multiple notches 127 are provided, they are preferably provided at equal intervals around the circumference of the upper flange portion 121. Furthermore, for example, upper flange portion 121 of upper drain member 120 may be formed in a gear shape in plan view or in a discontinuous ring shape in plan view. In this case, the location of the cutout is arbitrary. When forming the notches 127, the notches 127 may be provided in the upper flange portion 121 at positions where the vertical ribs 155 are formed. However, in order to maintain the strength of the vertical ribs 155, it is preferable to form the notches 127 in positions of the upper flange portion 121 where the vertical ribs 155 are not formed. In order to allow rainwater to flow smoothly into the outlet portion 121H, it is preferable to form a notch 127 in a direction perpendicular to the pipe axis of the upper drain member 120A. Furthermore, for example, the upper flange portion 121 of the upper drain member 120 may be a polygon, such as a square, pentagon, or hexagon, in plan view. In this case, it is preferable that the outer edge ends of the vertical ribs 155 coincide with the vertices of the polygon. For example, when there are five vertical ribs 155, the upper flange portion 121 is pentagonal in plan view, and when there are six vertical ribs 155, the upper flange portion 121 is hexagonal in plan view, and the upper flange portion 121 and the vertical ribs 155 are arranged so that the outer edge ends of the vertical ribs 155 are positioned at the vertices of the polygonal upper flange portion 121. In the case of a polygonal shape, each vertex may be sharp or may be chamfered into an arc shape.

[0154] The cutout range (size of cutout 127) in upper drain member 120A is arbitrary. However, in order to prevent upper drain member 120A from shifting relative to pilot hole 11H, it is preferable that the cutout range (size of cutout 127) be set to the range from the circumscribing circle of upper flange portion 121 to positioning step portion 126. 30 to 32, the notch 127 may be cut out toward the center of the pilot hole 11H rather than the positioning step 126. In this case, the presence of the notch 127 makes it possible to eliminate the step caused by the upper flange portion 121 in the bottom plate 11 of the eaves gutter 10. As a result, rainwater accumulating on the bottom plate 11 can easily flow into the outlet portion 121H.

[0155] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, without departing from the spirit of the present invention, and the above-described embodiments may be combined and applied as appropriate. [Explanation of symbols]

[0156] 1, 1A, 1B Rain gutter piping structure (piping structure) 10 Gutters 11 Bottom plate 11A Top 11B Bottom side 11H pilot hole 12 Side panel 100, 200, 300, 400, 600, 700 Siphon drain component (drain component) 110, 210, 310, 410, 610, 710 Lower drain member 111 Lower flange 112, 212, 312, 412 First outer cylinder part 113, 213, 313, 413 Second outer cylinder 113A, 212A, 313A, 415C spigot 114, 314, 414 connection part 115, 215, 315, 415 Inner circumference threaded part (inner circumference engagement part) 116, 216, 316, 416 Lower guide sleeve (insertion guide part) 117, 317, 417 recesses 118 Engagement protrusion (engaged part) 119 Engagement recess (engagement portion) 120, 120A, 120B, 520, 620, 720 Upper drain member 121 Upper flange 121H Drop-off section 122 Inner cylinder 123 Inner cylinder narrowed diameter section 125 Outer thread part (outer engagement part) 418 Cover 615 First locking portion (inner peripheral engagement portion) 625 Second locking portion (outer peripheral engagement portion) 715 First locking portion (inner peripheral engagement portion) 725 Second locking part (outer peripheral engagement part)

Claims

1. A drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, the drain member being attached to an eaves gutter having a pilot hole formed in the bottom plate, a lower drain member including: a lower flange portion disposed on the lower surface of the bottom plate and bonded to the lower surface; a first outer tubular portion formed below the lower flange portion and extending downward; a second outer tubular portion disposed inside the first outer tubular portion and having an inner circumferential engagement portion on its inner surface; and a connecting portion connecting the first outer tubular portion and the second outer tubular portion; an upper drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop opening formed on its inner periphery; an inner tubular portion formed below the upper flange portion, extending downward, and inserted into the second outer tubular portion; an inner tubular tapered portion connecting the upper flange portion and an upper end of the inner tubular portion and tapering downward; and an outer periphery engaging portion formed on the outer periphery of the inner tubular portion and screwed into the inner periphery engaging portion, A drain member characterized in that at least one of the upper drain member and the lower drain member is provided with an insertion guide portion that guides the inner cylindrical portion toward the inner side of the second outer cylindrical portion when the upper drain member and the lower drain member are attached.

2. The drain member according to claim 1, The insertion guide portion A drain member characterized in that it is composed of an upper guide sleeve extending downward from the lower end of the outer peripheral engagement portion, or a lower guide sleeve extending upward from the upper end of the inner peripheral engagement portion.

3. The drain member according to claim 1 or 2, The connecting portion is A drain member characterized by comprising an engaged portion provided on the inner surface of the first outer cylindrical portion and an engaging portion provided on the outer surface of the second outer cylindrical portion.

4. The drain member according to claim 1 or 2, The connecting portion is A drain member characterized in that it is composed of a bridge portion that integrally connects the inner surface of the first outer cylindrical portion and the outer surface of the second outer cylindrical portion.

5. The drain member according to any one of claims 1 to 3, A drain member characterized in that a recess is provided at the lower end of the first outer cylindrical portion or the lower end of the second outer cylindrical portion.

6. The drain member according to any one of claims 1 to 4, A drain member characterized in that a lower end of the first outer cylindrical portion is formed as a spigot to be connected to a fitting.

7. The drain member according to any one of claims 1 to 4, A drain member characterized in that the lower end of the second outer cylindrical portion is formed as a spigot to be connected to a fitting.

8. The drain member according to any one of claims 1 to 7, The drain member has a cover that covers the outside of the first outer cylindrical portion.

9. A piping structure comprising the drain member according to any one of claims 1 to 8.

Images