Drain member, drain piping structure, and building

Abstract

To provide a drain member that excels in workability.SOLUTION: A drain member is fitted on a gutter that has a prepared hole 11H formed on the bottom plate 11, consisting of a lower drain member 110 and an upper drain member 120. The lower drain member comprises: a lower flange part 111 which, being arranged on the bottom surface of the bottom plate 11, has a receiving opening formed on its inner periphery; an outer cylinder part 112L which, being formed under the lower flange part 111, extends downwards; and an inner periphery engagement part formed on the inner peripheral surface of the outer cylinder part 112L. The upper drain member comprises: an upper flange part 121 which, being arranged on the upper surface of the bottom plate 11, has a chute part 121H formed on the inner peripheral side; an inner cylinder part 122 which, being formed under the upper flange part, extends downwards and is inserted into the outer cylinder part 112L; and an outer engagement part that is formed on the outer peripheral surface of the inner cylinder part 122 to engage with the inner engagement part. The upper drain member 120 comprises alignment parts that are arranged at partial positions on the bottom surface of the upper flange part 121 corresponding to the peripheral part of the prepared hole 11H.SELECTED DRAWING: Figure 7E

Description

[Technical Field]

[0001] The present invention relates to a drain member that is attached to a eaves gutter and connects the eaves gutter to a downstream downspout or joint, a gutter piping structure, and a building. [Background technology]

[0002] As is well known, drain members with high drainage capabilities are widely used inside large eaves gutters that are placed at the eaves of buildings in large facilities such as factories and shopping centers.

[0003] Such drain members generally comprise a lower drain member that is placed on the lower surface of the bottom plate of the eaves gutter, and an upper drain member that is placed on the upper surface. Such a drain member having a lower drain member and an upper drain member is used in a variety of applications.

[0004] For example, Patent Document 1 discloses an eaves gutter drain that is installed in an eaves gutter so as to penetrate a rainwater drainage opening provided in the bottom plate of the eaves gutter, and that has an engaging part formed of a cylindrical surface near the inner peripheral edge of the lower surface of the upper flange of the upper unit (upper drain part), which can engage with the peripheral part of a circular opening (pre-hole) in the bottom plate of the eaves gutter. It also discloses that this makes it easier to position the upper unit more accurately in a predetermined position on the peripheral part of the opening (pre-hole) of the eaves gutter. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2024-004187 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when inserting the drain member into the eaves gutter pilot hole, the drain member would come into contact with the eaves gutter, or the upper drain and lower drain, making it difficult to insert, and there was room for improvement in ease of installation.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a drain member, a gutter piping structure, and a building that are easy to install. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following means. (1) A drain member having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, and attached to an eaves gutter having a pilot hole formed in the bottom plate, the drain member having a lower flange portion disposed on the underside of the bottom plate and having an inlet formed on the inner periphery, an outer tubular portion formed below the lower flange portion and extending downward, an outer tubular tapered portion connecting the lower flange portion and the upper end of the outer tubular portion and tapering downward, and an inner periphery mating portion formed on the inner periphery of the outer tubular portion, and a lower drain member disposed on the upper surface of the bottom plate, the lower flange portion having an inlet formed on the inner periphery of the outer tubular portion, the an upper drain member having an upper flange portion with a drop opening formed on its inner periphery, an inner tubular portion formed below the upper flange portion and extending downward to be inserted into the outer tubular portion, an inner tubular tapered portion connecting the upper flange portion and the upper end of the inner tubular portion and tapering in diameter as it extends downward, and an outer periphery mating portion formed on the outer periphery of the inner tubular portion and screwed into the inner periphery mating portion, and the upper drain member has an alignment portion partially positioned on the lower surface of the upper flange portion at a position corresponding to the periphery of the pilot hole. (2) A drain member, wherein the alignment portion is a bent portion. (3) A drain member, wherein the alignment portion is a stepped portion. (4) The drain member has the alignment portions formed at equal intervals in the circumferential direction. (5) A drain member, wherein the alignment portion is provided across the parting line or at a position 90 degrees circumferentially away from the parting line. (6) A drain member, wherein the inner circumferential engagement portion is an inner circumferential thread portion, and the outer circumferential engagement portion is an outer circumferential thread portion. (7) A drain member in which at least one of the alignment portions is formed so that, in a plan view, it spans the position of the upper end of the outer peripheral thread portion of the upper drain member, or the upper end of the outer peripheral thread portion and the end of the alignment portion are in the same position. (8) In the drain member and the lower drain member, the inner peripheral thread portion is formed at a distance from the upper end of the outer cylindrical portion. (9) A gutter piping structure having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, an eaves gutter with a pilot hole formed in the bottom plate, a drain member of any one of (1) to (7), a downspout provided downstream of the drain member, and a fitting connecting the drain member and the downspout. (10) A building having the gutter piping structure of (9). [Effects of the Invention]

[0009] The present invention can provide a drain member, a gutter piping structure, and a building that are easy to install. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view illustrating a gutter piping structure including a drain member (drain member) according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a perspective view illustrating the drain member according to the first embodiment in a state where it is attached to an eaves gutter. [Figure 3] FIG. 3 is a perspective view illustrating details of an upper drain member according to the first embodiment. [Figure 4] FIG. 2 is a perspective view illustrating details of a drain member according to the first embodiment. [Figure 5] 2 is a schematic diagram illustrating the schematic configuration of the drain member according to the first embodiment, taken along a line perpendicular to the longitudinal direction of the eaves gutter. FIG. [Figure 6]1 is an exploded schematic diagram including an eaves gutter, illustrating the schematic configuration of a drain member according to a first embodiment. FIG. [Figure 7A] FIG. 2 is a vertical cross-sectional view illustrating the schematic configuration of the drain member according to the first embodiment in an assembled state. [Figure 7B] FIG. 2 is a vertical cross-sectional view illustrating an exploded state of the drain member according to the first embodiment, illustrating a schematic configuration of the drain member. [Figure 7C] FIG. 2 is a vertical cross-sectional view illustrating a schematic configuration of a drop opening portion of the drain member according to the first embodiment. [Figure 7D] FIG. 10 is a vertical cross-sectional view of a modified example of the insertion guide portion of the lower drain member according to the first embodiment. [Figure 7E] 7B is a view of the upper drain member of the drain member according to the first embodiment (FIG. 7B) as viewed in the direction of the arrow A. FIG. [Figure 8A] FIG. 10 is a vertical cross-sectional view illustrating a schematic configuration of a drain member according to a third embodiment of the present invention in an assembled state. [Figure 8B] FIG. 10 is a vertical cross-sectional view illustrating an exploded state of a drain member according to a third embodiment, illustrating a schematic configuration of the drain member. [Figure 9A] FIG. 10 is a vertical cross-sectional view illustrating the assembled state of a drain member according to a fourth embodiment of the present invention, illustrating a schematic configuration thereof. [Figure 9B] FIG. 10 is an exploded vertical cross-sectional view illustrating a schematic configuration of a drain member according to a fourth embodiment. [Figure 9C] FIG. 10 is a vertical cross-sectional view illustrating a schematic configuration of a positioning edge portion formed on an upper drain member according to a fourth embodiment. [Figure 9D] FIG. 11 is a vertical cross-sectional view of a modified example of the insertion guide portion of the lower drain member according to the fourth embodiment. [Figure 9E] 9B is a view of an upper drain member of the drain member according to the fourth embodiment, viewed in the direction of the arrow A. FIG. [Figure 10A] FIG. 10 is a vertical cross-sectional view illustrating the assembled state of a drain member according to a fifth embodiment of the present invention, illustrating a schematic configuration thereof. [Figure 10B] FIG. 10 is an exploded vertical cross-sectional view illustrating the schematic configuration of a drain member according to a fifth embodiment. [Figure 11A] FIG. 10 is a perspective view of a first modified example of an upper drain member of the present invention. [Figure 11B] FIG. 10 is a side view of a first modified example of the upper drain member of the present invention. [Figure 11C] 10 is a view of a first modified example of an upper drain member of the present invention, viewed in the direction of the arrow A. FIG. [Figure 12] FIG. 4 is a partial cross-sectional view showing a funnel portion and a longitudinal rib of an upper drain member having a funnel portion. [Figure 13A] FIG. 10 is a side view of a second modified example of the upper drain member of the present invention. [Figure 13B] FIG. 10 is a cross-sectional view of a second modified example of the upper drain member of the present invention. [Figure 14] FIG. 10 is a vertical cross-sectional view illustrating an assembled state of a drain member, illustrating a modified example of the joint portion of the present invention. [Figure 15] 10A and 10B are diagrams illustrating a modified example of the engagement portion of the upper drain member of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 7E. Fig. 1 is a side view illustrating a rain gutter piping structure equipped with a drain member according to a first embodiment of the present invention. Figs. 2 to 6 are diagrams illustrating an outline of a siphon drain member according to the first embodiment. The rain gutter piping structure is installed in a building, and collects rainwater that falls on the roof into an eaves gutter and allows the rainwater to flow downwards of the building. In the drawings, reference numeral 1 denotes the gutter piping structure (piping structure), reference numeral 10 denotes the eaves 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 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.

[0012] As shown in FIG. 1, the gutter piping structure (piping structure 1) includes, for example, an eaves gutter 10, a drain member 100 attached to a circular pilot hole (through hole) 11H formed in the bottom surface 11 of the eaves gutter 10, a first elbow (elbow member) 20 connected to the underside of the drain member 100, a call gutter 24 connected to the downstream side of the first elbow 20, a second elbow (elbow member) 25 connected to the downstream side 24B of the call gutter 24, and a downspout 30 connected to the downstream side of the second elbow 25.

[0013] In addition, in order to allow rainwater to flow smoothly, it is possible to perform drainage calculations to confirm whether the maximum drainage volume obtained by the combination of the eaves gutter 10, downspout 30, and drain member 100 meets the required drainage volume expected from the amount of rainfall. For example, the roof projection area per drain (outlet) can be calculated from architectural drawings, etc., and multiplied by the rainfall intensity to obtain the rainfall amount. Furthermore, the drainage volume of the eaves gutter 10 can be obtained from the effective drainage cross-sectional area and wetted side length of the eaves gutter 10. In addition, the drainage volume of the downspout 30 can be obtained from the length of the downspout 30 and the effective drainage cross-sectional area. Therefore, by checking whether the drainage volume of the eaves gutter 10 or the downspout 30 exceeds the amount of rainfall, it can be confirmed whether the required drainage volume is being met.

[0014] 1, 2, 5, and 6, 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 support (not shown) attached to a fascia board (not shown) to receive rainwater flowing down from the eaves (not shown) of the roof. The support may be a gutter hanger attached to the fascia board or a gutter receiver attached to the roof, and is not particularly limited.

[0015] 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.

[0016] Furthermore, when the eaves gutter 10 is made of synthetic resin, it is preferable that the linear expansion coefficient be 2.0 × 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. When a low-elasticity sheet is used, it may be made up of one sheet, two sheets, or multiple sheets. By using multiple sheets, for example, a weather-resistant sheet can be used on the side of the eaves gutter side panel facing away from the building (the left side panel in Figure 1), which is more likely to be exposed to sunlight, or by using a high-strength sheet in areas where strength is required, thereby achieving a low-cost eaves gutter with multiple functions.

[0017] The bottom width of the eaves gutter 10 is preferably 100 mm or more and 300 mm or less, and more preferably 200 mm or less. The height of the side panels 12 of the eaves gutter 10 is preferably 90 mm or more and 300 mm or less, and more preferably 200 mm or less. The eaves gutter 10 may be applied to a large-diameter downspout that can carry rainwater at a flow rate of, for example, 4 liters / sec or more and 90 liters / sec or less. As shown in Figure 1, the height of the side panel 12 may be different or the same for the side panel 12 on the building side (the side panel 12 on the right side in Figure 1) and the side panel 12 on the opposite side of the building (the side panel 12 on the left side in Figure 1). The diameter of the downspout is not limited, but examples include 50A, 75A, 100A, 150A, and 200A.

[0018] 1 to 6, the 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.

[0019] The material for forming the drain member 100 can be selected arbitrarily. In this embodiment, the drain member 100 is an injection-molded product made of synthetic resin such as hard vinyl chloride resin, polycarbonate, ABS, AES, etc. However, the material is not limited to synthetic resin, and the drain member 100 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.

[0020] 2 to 6, 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. The gripping ribs 156 may not be provided, and the vertical ribs 155 may be used in place of the gripping ribs 156.

[0021] 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 101A through which rainwater W accumulated in the eaves gutter 10 flows into the drop opening portion 121H.

[0022] The inlet opening 101A is located in a direction perpendicular to the horizontal plane, and is between the outer peripheral edge 151A of the cover member 151 and the upper surface 11A of the eaves gutter 10, or between the upper flange portion 121 of the upper drain member 120. 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 101A 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 101A 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.

[0023] The size, height, and shape of lid member 151, which will be described later, are adjusted so that the area of ​​inflow opening 101A is larger than the opening area A1 of drop opening 121H described above. In this embodiment, the area of ​​inflow opening 101A can be calculated by multiplying the circumference of circular lid member 151, i.e., the length of outer circumferential edge 151A, by the height H of lid member 151.

[0024] The cover member 151 is supported by the upper flange portion 121 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 and positioned above the drop opening 121H. The cover member 151 has an inlet opening 101A formed on the upper surface 11A of the eaves gutter 10 below the cover member 151, through which rainwater W flows into the drop opening 121H. The cover member 151 is preferably positioned at a height H of 10 to 60 mm upward from the outer peripheral edge 151A of the cover member 151. While the embodiment describes an example in which the vertical ribs 155 are formed in a plate shape, the shape of the vertical ribs 155 is not limited to a plate shape. As another example, the vertical ribs 155 may be formed in other shapes, such as a columnar shape. Although the embodiment describes an example in which the vertical ribs 155 are radially arranged along the radial direction, the shape is not limited to this. As another example, the vertical ribs 155 may be arranged at an angle relative to the radial direction.

[0025] 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 of ​​drop opening portion 121H. Alternatively, it may be set equal to or smaller than the opening area of ​​drop opening portion 121H.

[0026] Furthermore, it is more preferable that the height H of the lid member 151 is set at a position 30 to 40 mm above the outer peripheral edge 151A of the lid member 151, and that the diameter of the lid member 151 is set to 150 to 200% of the opening outer diameter R1 of the drop opening portion 121H. If the diameter of lid member 151 is smaller than 150% of the opening outer diameter R1 of downspout portion 121H, the water level in eaves gutter 10 will be lower than lid member 151, and there is a risk that lid member 151 will not come into contact with the inflowing water. Also, if the diameter of lid member 151 exceeds 200%, the proportion of the water flowing in from inlet opening 101A that collides with lid member 151 will increase, and the water level in eaves gutter 10 will become too high above lid member 151, which may reduce siphon performance.

[0027] In addition, for the siphon action to occur, a certain water level is required to make it easier to create a full flow state at the opening, and it is desirable that the water level in the eaves gutter 10 is higher than the inlet opening 101A, and it is desirable that the height H of the cover member 151 is lower than the maximum water level in the eaves gutter 10. In order to ensure stable siphon action, 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 from the bottom surface 11 of the side panel 12 of the eaves gutter 100.

[0028] 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. 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 150 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.

[0029] As shown in FIGS. 2 to 6, 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 when tightening the drain member 100 can be easily performed. Note that the gripping ribs 156 may be arranged continuously in the circumferential direction. The gripping ribs 156 may be used for purposes other than gripping, or may be simple ribs that are not intended for "gripping."

[0030] The gripping rib 156 is made up of a rib main body 156A extending in the circumferential direction and extensions 156B protruding outward from both ends of the rib main body 156A. When attaching the drain member 100 to the first elbow 20, for example, a rod-shaped member can be engaged between the gripping ribs 156, 156 adjacent to each other in the circumferential direction and then rotated to tighten the members. Furthermore, by forming gaps between the gripping ribs 156 and by providing gripping ribs 156 of different heights on a portion of the top of the lid, fallen leaves and other debris are prevented from sticking to the lid and the debris can easily pass through the drainage member, which makes it easier for fallen leaves and other debris in the eaves gutter 10 to pass through and prevents them from becoming tangled.

[0031] 3 to 6, 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 101A 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.

[0032] 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 101A 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 101A into the drop opening 121H.

[0033] 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 to form 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 30 mm.

[0034] Next, we will explain the function of the siphon portion 150 of the drain member 100 described above. Note that the present invention does not necessarily have to have the siphon portion 150. If the siphon portion 150 is provided as in this embodiment, it is preferable because it has the function described below and can provide a drain member with excellent drainage performance.

[0035] High siphon performance is a state in which siphoning occurs continuously. On the other hand, low siphon performance is a state in which siphoning does not occur, or does not occur continuously, with siphoning occurring and not occurring irregularly. If siphoning does not occur continuously, when the amount of water flowing in increases, the drainage volume cannot keep up and there is a risk of it overflowing from the eaves gutter. In addition, the water level in the eaves gutter will repeatedly rise and fall, which may cause the drainage volume to be unstable. Furthermore, if siphoning occurs continuously, the water level will remain low.

[0036] 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 101A during heavy rain, downspout 30 is filled with water and sealed without drawing in air, thereby generating a siphon phenomenon downstream.

[0037] 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.

[0038] The first elbow (elbow member, joint member) 20 is a joint that is installed on the downstream side of the drain member 100. The first elbow 20 is connected to the lower side of the drain member 100, as shown in FIG. As shown in Fig. 1, the first elbow 20 includes a first receiving portion (one end) 21, a second receiving portion (the other end) 22, and a curved pipe portion 23 that is curved at approximately 90° in side view. The degree of curvature of the curved pipe portion 23 is not particularly limited, and for example, the curved pipe portion 23 may be curved at 45° in side view. In this way, the angle of curvature of the curved pipe portion 23 can be appropriately selected depending on the installation location. Also, the curved pipe portion 23 does not necessarily have to be provided, and the drain member 100, a joint, and a downspout 30 may be connected to form a straight drop.

[0039] First receiving portion 21 is formed with an inner diameter that allows it to be connected to lower drain member 110 of drain member 100, and as shown in Fig. 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.

[0040] 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 .

[0041] 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.

[0042] Furthermore, for example, if the length of the call down pipe exceeds 2.0 m, the flow rate may decrease due to frictional resistance of the pipes of the call down pipe 24, the full flow state may be interrupted, and the siphon effect may not be sustained. Therefore, 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) is preferably 0.6 m or more and 2.0 m or less, and more preferably 0.6 m or more and 1.0 m or less. 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.

[0043] 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).

[0044] 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.

[0045] 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 101A, 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 drain member 100 is filled with water and sealed, so the rainwater flows down the downspout 30, filling it with water, causing a siphon effect in the drop opening 121H, the inlet pipe 24, and the downspout 30, and causing the rainwater to be forcefully discharged from the downspout 30 into the drain pipe (not shown).

[0046] Next, the lower drain member 110 and the upper drain member 120 that constitute the drain member 100 will be described with reference to FIGS. 7A to 7E. Fig. 7A is a longitudinal cross-sectional view illustrating the schematic configuration of the drain member according to the first embodiment in an assembled state, and Fig. 7B is a longitudinal cross-sectional view illustrating the disassembled state. Fig. 7C is a longitudinal cross-sectional view illustrating the schematic configuration of the drop opening of the drain member, and Fig. 7E is a view of the upper drain member of the drain member as viewed from the direction of arrow A in Fig. 7B. Figs. 7A and 7B are simplified views of the drain member with the siphon portion omitted.

[0047] As described above, the 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. Note that the siphon portion may not be included.

[0048] As shown in Figures 7A and 7B, the lower drain member 110 includes, for example, a lower flange portion 111 arranged on the lower surface 11B of the eaves gutter 10, an outer tube portion 112 formed below the lower flange portion 111 and extending downward, an outer tube reduced diameter portion 113 connecting the lower flange portion 111 and the outer tube portion 112, and an inner peripheral fitting portion (inner peripheral thread portion 115) formed on the inner surface of the outer tube portion 112.

[0049] The lower flange portion 111 has, for example, a circular outer shape in plan view, and a receiving port 111H that is also circular in plan view is formed on the inner periphery side. That is, the lower flange portion 111 is formed of a flat plate that is ring-shaped in plan view. The lower flange portion 111 has an upper surface 111A on the outer periphery side formed as a flat surface, and an inner periphery side formed as a recess that is recessed downward from the flat surface. An upper surface 111A of the lower flange portion 111 is disposed on a lower surface 11B of the bottom plate 11 of the eaves gutter .

[0050] The 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 . Further, an outer cylinder inner peripheral hole 112H is formed inside the outer cylinder portion 112, penetrating vertically. An inner peripheral thread portion 115 is formed on the inner peripheral surface of the outer cylindrical portion 112 . Furthermore, four tool mounting recesses (recesses) 118 that are recessed upward are formed at 90° intervals in the circumferential direction at the lower end 112T of the outer cylinder portion 112. The number of tool mounting recesses (recesses) 118 provided in the circumferential direction is not limited, but it is preferable to form two or more because this makes it easier to mount tools and facilitates construction. It is possible to arbitrarily set the position and number of the tool mounting recesses (recesses) 118. In addition, the vertical position of the upper bottom surface 118A of the tool mounting recesses (recesses) 118 can be arbitrarily set, but it is preferable that they be formed above the lower end 112T of the inner cylinder 122.

[0051] As shown in FIGS. 7A and 7B, outer cylinder reduced diameter portion 113 connects lower flange portion 111 and the upper end of outer cylinder portion 112 by decreasing in diameter as it extends downward. Furthermore, an insertion guide portion (continuously reducing inner diameter surface) 113G is formed on the inner peripheral surface of outer cylinder reduced diameter portion 113. In this embodiment, insertion guide portion (continuously reducing inner diameter surface) 113G is formed, for example, by an inclined surface on the inner peripheral side of a substantially conical cylinder whose diameter continuously reduces from the upper end of outer cylinder reduced diameter portion 113 to the inner peripheral surface of outer cylinder portion 112. In other words, insertion guide portion (continuously reducing inner diameter surface) 113G is configured so as to have no steps protruding toward the inner peripheral side or bulges that could cause catches.

[0052] The shape of the continuously tapered inner diameter surface can be set arbitrarily, and is not limited to an inclined surface formed in an approximately conical shape in which the cross section including the tube axis O1 is tapered in a linear manner, but may be, for example, a configuration in which the cross section is tapered in a curved manner, or a tapered surface that combines straight and curved lines.

[0053] 7D, the outer tube reduced diameter portion 113 may have a step. Specifically, the outer tube reduced diameter portion 113 includes a large diameter portion 113A that forms the upper end of the outer tube reduced diameter portion 113 and that reduces in diameter from the upper end downward, and a small diameter portion 113B that is connected to the lower end of the large diameter portion 113A and has a smaller diameter than the large diameter portion 113A. The large diameter portion 113A and the small diameter portion 113B are arranged coaxially with the tube axis O1. An insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner peripheral surface of the large diameter portion 113A. According to this configuration, an insertion guide portion (continuously reducing inner diameter surface) 113G is formed on the inner circumferential surface of the large diameter portion 113A that forms the upper end of the outer tubular portion 11. Therefore, when attaching the inner tubular portion 122 of the upper drain member 320 to the outer tubular portion 112 of the lower drain member 110, the inner tubular portion 122 of the upper drain member 320 can be guided downward along the insertion guide portion (continuously reducing inner diameter surface) 113G of the large diameter portion 113A, and the inner tubular portion 21 can be inserted into the inside of the outer tubular portion 11.

[0054] An inner peripheral threaded portion (inner peripheral screw portion 115 ) is formed on the inner peripheral surface of outer cylindrical portion 112 . It should be noted that various known shapes can be applied to the inner circumferential thread portion 115. Specifically, it may be formed with intervals in the circumferential direction or may be formed continuously in the circumferential direction.

[0055] As shown in Figures 7A and 7B, 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 circumferential side, 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 125 formed on the outer circumferential surface of the inner tube portion 122. Then, the inner cylindrical portion 122 of the upper drain member 120 is inserted into the outer cylindrical portion 112 of the lower drain member 110, and the outer peripheral thread portion 125 and the inner peripheral thread portion 115 are screwed together to form the siphon drain member 100.

[0056] The upper flange portion 121 is formed, for example, in a circular outer shape in a plan view, and has a drop opening 121H on the inner periphery that is also circular in a plan view. That is, the upper flange portion 121 is formed in 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 .

[0057] Further, the lower surface 121B of the upper flange portion 121 has, for example, a flat surface formed on the outer circumferential side, and a step portion 126 (alignment portion) consisting of a cylindrical portion protruding downward along the axis O2 partially formed on the inner circumferential side of the flat surface. Here, "partially formed step portion 126" means, for example, that the step portion 126 is provided in half or less of the circumferential length of the lower surface 121B of the upper flange portion 121. For example, in this embodiment, as shown in FIG. 7E, four stepped portions 126 are provided at equal intervals in the circumferential direction on the lower surface 121B of the upper flange portion 121. In this embodiment, the stepped portions 126 can also be considered protrusions provided on the outer peripheral surface of the inner-tube reduced diameter portion 123. In areas where the stepped portions 126 are not provided, the lower surface 121B of the upper flange portion 121 and the outer peripheral surface of the inner-tube reduced diameter portion 123 are smoothly connected without any steps. Note that the intervals between the stepped portions 126 do not need to be equal, but equal intervals are preferable because they prevent the lower drain 110 from shifting position relative to the pilot hole 11H. The number of stepped portions 126 is not limited and may be, for example, one, two, three, five, six, or more. However, from the viewpoint of stable positioning, it is preferable to provide multiple stepped portions 126 in the circumferential direction. From the viewpoint of simplifying the mold structure during molding, it is preferable that the number of stepped portions 126 is an even number. Furthermore, the circumferential length of each step portion 126 is not limited, and the circumferential lengths of multiple step portions 126 may all be the same, or the circumferential lengths of some or all of the step portions 126 may be different. Furthermore, for example, when there is one step portion 126, it may be provided over half or more of the circumferential length of the lower surface 121B of the upper flange portion 121. When there is one step portion 126, if it is smaller than half of the circumferential length of the lower surface 121B of the upper flange portion 121, the lower drain 110 will be misaligned in the circumferential direction with respect to the pilot hole 11H. Therefore, it is more preferable that the step portion 126 be provided over half or more.

[0058] 7E, it is preferable that step portion 126 is provided across parting line PL or at a position 90 degrees circumferentially away from parting line PL. The position 90 degrees circumferentially away from parting line PL may be, for example, a position across second imaginary line L2 that is perpendicular to first imaginary line L1 that passes through parting line PL when upper drain member 120 is viewed from the direction of axis O2. This configuration allows drain member 100 to be obtained with a simple mold structure.

[0059] The step portion 126 comes into contact with the inner circumferential 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. In this way, the step portion 126 only needs to come into contact with the inner circumferential surface of the pilot hole 11H during positioning. Therefore, for example, after installation is completed, the step portion 126 does not need to be in constant contact with the inner circumferential surface of the pilot hole 11H of the eaves gutter 10. Furthermore, when the upper drain member 120 is inserted into the pilot hole 11H, for example, obliquely, during installation, if the step portion 126 is partially provided on the lower surface 121B of the upper flange portion 121, the step portion 126 is less likely to come into contact with the inner circumferential surface of the pilot hole 11H. Therefore, during installation, it is possible to prevent the step portion 126 from coming into contact with the inner circumferential surface of the pilot hole 11H and getting caught before positioning, which would make installation difficult. As shown in FIG. 3, the upper surface 121A of the upper flange portion 121 is configured as a gently curved portion.

[0060] The inner cylinder portion 122 is formed, for example, in a cylindrical shape that can be inserted into the outer cylinder portion 112 with the pipe axis O2 as its center, and extends in the vertical direction while attached to the eaves gutter 10. Furthermore, an inner peripheral hole 122H is formed inside the inner cylindrical portion 122, penetrating vertically. Additionally, an outer circumferential thread portion 125 is formed on the outer circumferential surface of the inner cylindrical portion 122 .

[0061] As shown in FIGS. 7A and 7B, inner cylinder reduced diameter portion 123 connects upper flange portion 121 and the upper end of 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 port 121H in the siphon portion 150 to the inner cylinder inner peripheral hole 122H.

[0062] 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, configured by a gentle curve that concaves inward to the upper end of the inner tube portion 122 in a cross section including the tube axis O1. 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 configured by a straight line or a line that combines 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.

[0063] The outer circumferential thread portion 125 is formed on the outer circumferential surface of the inner cylindrical portion 122 . 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. For example, the outer peripheral thread portion 125 may be formed with gaps in the circumferential direction or may be formed continuously in the circumferential direction. The outer peripheral thread portion 125 is preferably a multiple-start thread. The number of threads in the multiple-start thread is not limited, but may be, for example, two, three, or four. If the outer peripheral thread portion 125 is a multiple-start thread, a high mating force can be obtained with a short thread length, and the number of rotations required to mating the upper drain member 120 and the lower drain member 110 can be reduced, improving workability. 6, it is preferable that the upper end 125A of the outer peripheral thread portion 125 is located on the parting line PL. If the outer peripheral thread portion 125 is a multiple-start thread and has multiple upper ends 125A, it is preferable that any one of the upper ends 125A is located on the parting line PL.

[0064] Furthermore, it is preferable that the positional relationship between the aforementioned step portion (alignment portion) 126 and the upper end portion 125A of the outer peripheral screw portion 125 is such that at least one step portion 126 straddles the position of the upper end portion 125A of the outer peripheral screw portion 125 in a planar view, or is formed so that the upper end portion 125A of the outer peripheral screw portion 125 and the side surface 126A of the step portion 126 are in the same position.

[0065] 7C, a description will be given of upper surface 123A of inner cylinder reduced diameter portion 123 that forms the flow path surface of siphon portion 150. Reference symbol P1 shown in FIG. 7C , it is preferable that the radius of curvature R of upper surface 123A of inner cylinder reduced diameter portion 123 be formed as large as possible, taking into consideration, for example, the diameter D0 of pilot hole 11H, the diameter D1 of the inner circumferential upper end of outer cylinder reduced diameter portion 113, the diameter D2 of drop opening 121H, and the height dimension L11 to the lower end P1 of outer cylinder reduced diameter portion 113. In other words, in order to avoid interference between the outer peripheral surface of inner cylinder reduced diameter portion 123 and the inner circumferential upper end of outer cylinder reduced diameter portion 113, it is preferable to reduce the curvature of outer cylinder reduced diameter portion 113, i.e., upper surface 123A, or to set the diameter D1 of outer cylinder reduced diameter portion 113 large.

[0066] Specifically, for example, when the joint (elbow or the like) or downspout connected to the lower drain member 110 has a nominal diameter of 75, it is preferable to set the radius of curvature R to 10 mm or more and 30 mm or less. Also, for example, in the case of a nominal diameter of 100, it is preferable to set the radius of curvature R to 12 mm or more and 40 mm or less, and in the case of a nominal diameter of 125, it is preferable to set the radius of curvature R to 13 mm or more and 50 mm or less.

[0067] Next, a procedure for attaching the drain member 100 to the eaves gutter 10 will be described. First, a pilot hole (through hole) 11H for attaching the drain member 100 is formed in the bottom wall 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. Next, insert the inner cylindrical portion 122 of the upper drain member 120 into the lower drain member 110, and screw the outer peripheral threaded portion 125 into the inner peripheral threaded portion 115. Once screwed to the specified position, insert a construction tool (not shown) into the tool mounting recess (recess) 118 and continue to rotate it until it is seated in the specified position, thereby fixing the drain member 100. The order in which the upper drain member 120 and the lower drain member 110 are attached is not limited to the above, and the lower drain member 110 may be attached first and then fitted with the upper drain member 120.

[0068] According to the drain member 100 of the first embodiment, an insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner surface of the outer tube reduced diameter portion 113 of the lower drain member 110, so that the inner tube portion 122 of the upper drain member 120 is guided to the inside of the outer tube portion 112 without getting caught on the inner surface of the outer tube reduced diameter portion 113. As a result, the inner cylindrical portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylindrical portion 112 of the lower drain member 110.

[0069] According to the drain member 100 of the first embodiment, a step portion 126 (alignment portion) is partially formed on the lower surface 121B of the upper flange portion 121, so that the siphon drain member 100 can be accurately and efficiently attached to the eaves gutter 10. Furthermore, the step portion 126 is partially provided on the lower surface 121B of the upper flange portion 121. Therefore, even if a defectively machined portion (edge, burr, etc.) is formed in part of the pilot hole 11H, the upper drain member 120 can be positioned relative to the pilot hole 11H by avoiding such a defectively machined portion and bringing the step portion 126 into contact with the inner circumferential surface of the pilot hole 11H. This allows the drain member 100 to be easily installed.

[0070] Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 8A and 8B. Fig. 8A is a longitudinal cross-sectional view illustrating the schematic configuration of a drain member according to a second embodiment in an assembled state, and Fig. 8B is a longitudinal cross-sectional view illustrating the disassembled state. Note that Figs. 8A and 8B are simplified views of the drain member by omitting the siphon portion. In FIGS. 8A and 8B, reference numeral 300 denotes a drain member.

[0071] As shown in FIGS. 8A and 8B, the drain member 300 includes, for example, a lower drain member 310, an upper drain member 220, and a siphon portion (not shown) disposed above the upper drain member 220. That is, the drain member 300 is configured by combining, for example, a lower drain member 310 that includes an insertion guide portion (continuously reducing inner diameter surface) 113G and has an inner peripheral thread portion 115 formed at a distance from an upper end portion 112U of an outer cylindrical portion 112L, and an upper drain member 220. Here, the upper end portion 112U of the outer cylindrical portion 112L refers to the boundary portion between the outer cylindrical portion 112L and the insertion guide portion 113G (continuously reducing inner diameter surface). The upper drain member 220 is the same as that in the first embodiment, so it is given the same reference numeral and the description thereof will be omitted.

[0072] 8A and 8B, the lower drain member 310 includes, for example, a lower flange portion 111 disposed on the lower surface 11B of the eaves gutter 10, an outer tubular portion 112L formed below the lower flange portion 111 and extending downward, an outer tubular reduced diameter portion 113 connecting the lower flange portion 111 and the outer tubular portion 112L, and an inner circumferential thread portion 115 formed on the inner circumferential surface of the outer tubular portion 112L and spaced apart from the upper end portion 112U of the outer tubular portion 112L. The lower drain member 310 also includes an insertion guide portion (continuously reduced inner diameter surface) 113G formed on the inner circumferential surface of the outer tubular reduced diameter portion 113. The lower drain member 310 differs from the lower drain member 110 according to the first embodiment in that the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer tubular portion 112L. As the rest of the configuration is the same as that of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

[0073] Furthermore, the length L21 between the inner circumferential thread portion 115 and the upper end portion 112U of the outer tubular portion 112L can be set as desired, but it is preferable to set the length L21 longer than the height dimension L16 of the outer tubular reduced diameter portion 113, which starts from the upper surface 111A of the lower flange portion 111 shown in Fig. 9A. By setting L21 > L16, the inner tubular portion 122 of the upper drain member 120 can be smoothly inserted into the outer tubular portion 112.

[0074] According to the drain member 300 of the second embodiment, the lower drain member 310 includes an insertion guide portion (continuously tapered inner diameter surface) 113G, and the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer tubular portion 112L, thereby preventing oblique engagement between the lower drain member 310 and the upper drain member 220 and enabling efficient and stable assembly. Specifically, even if the upper drain member 220 and the lower drain member 310 are inserted at an angle during assembly, the distance between the inner circumferential thread portion 115 and the upper end portion 112U of the outer tubular portion 112L allows the pipe axis O1 of the upper drain member 220 and the pipe axis O2 of the lower drain member 310 to be coaxial with each other before the tip of the inner tubular portion 122 having the outer circumferential thread portion 125 of the upper drain member 220 comes into contact with the inner circumferential thread portion 115 of the lower drain member 310, and then the threads can be screwed together. Therefore, it is possible to prevent the screw from being fitted at an angle. In this case, it is preferable that the outer peripheral thread portion 125 of the upper drain member 220 is cut all the way to the lower end of the inner cylindrical portion 122. If the outer peripheral thread portion 125 of the upper drain member 220 is cut all the way to the lower end of the inner cylindrical portion 122, the length of the drain member 300 in the height direction can be reduced when the upper drain member 220 is combined with the lower drain member 310. This allows the drain member 300 to be made compact and to have an excellent aesthetic appearance.

[0075] <Third embodiment> Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 9A to 9C. Fig. 9A is a longitudinal cross-sectional view illustrating the schematic configuration of a drain member according to a third embodiment in an assembled state, and Fig. 10B is a longitudinal cross-sectional view illustrating the disassembled state. Fig. 10C is a longitudinal cross-sectional view illustrating the schematic configuration of a bent portion formed in an upper drain member. Figs. 9A and 9B are simplified views of the drain member with the siphon portion omitted.

[0076] 9A and 9B, reference numeral 400 denotes a drain member, reference numeral 320 denotes an upper drain member, reference numeral 321 denotes an upper flange portion, and reference numeral 321E denotes a bent portion (alignment portion).

[0077] As shown in Figures 9A and 9B, (drain member) 400 includes, for example, a lower drain member 110, an upper drain member 320, and a siphon portion (not shown) arranged above the upper drain member 320. The lower drain member 110 is the same as that in the first embodiment, so it is given the same reference numeral and the description thereof will be omitted.

[0078] As shown in Figures 9A and 9B, the upper drain member 320 includes, for example, an upper flange portion 321 disposed on the upper surface 11A of the bottom plate 11 and having a drop portion 121H formed on its inner circumferential side, an inner tube portion 122 formed below the upper flange portion 321 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 125 formed on the outer circumferential surface of the inner tube portion 122.

[0079] Additionally, the upper drain member 320 includes a bent portion 321E (alignment portion) partially disposed on the lower surface 321B of the upper flange portion 321. Here, the bent portion 321E being partially formed means that the bent portion 321E is provided, for example, on half or less of the circumferential length of the lower surface 121B of the upper flange portion 121. For example, in this embodiment, as shown in FIG. 9E, four bent portions 321E are provided at equal intervals in the circumferential direction on the lower surface 121B of the upper flange portion 121. In this embodiment, the bent portions 321E can be considered to be ridge lines provided at the boundary between the upper flange portion 121 and the inner-tube reduced-diameter portion 123. In areas where the bent portions 321E are not provided, the lower surface 121B of the upper flange portion 121 and the outer peripheral surface of the inner-tube reduced-diameter portion 123 are smoothly connected without any ridge lines. Note that the intervals between the bent portions 321E are not limited to being equal, but equal intervals are preferable because they reduce the likelihood of misalignment of the lower drain 110 with respect to the pilot hole 11H. The number of bent portions 321E is not limited and may be, for example, one, two, three, five, six, or more. However, providing multiple bent portions 321E in the circumferential direction is preferable from the perspective of stable positioning. From the viewpoint of simplifying the mold structure during molding, it is preferable that the number of bent portions 321E is an even number. Furthermore, the circumferential length of each bent portion 321E is not limited, and the circumferential lengths of the multiple bent portions 321E may all be the same, or the circumferential lengths of some or all of the bent portions 321E may be different. Furthermore, for example, when there is one bent portion 321E, it may be provided over more than half the circumferential length of the lower surface 121B of the upper flange portion 121. When there is one bent portion 321E, if it is smaller than half the circumferential length of the lower surface 121B of the upper flange portion 121, the lower drain 110 will be misaligned in the circumferential direction with respect to the pilot hole 11H. Therefore, it is more preferable that the bent portion 321E be provided over more than half.

[0080] 9E, bent portion 321E is preferably provided so as to straddle parting line PL or at a position 90 degrees circumferentially away from parting line PL. The position 90 degrees circumferentially away from parting line PL may be, for example, a position so as to straddle second imaginary line L2 that is perpendicular to first imaginary line L1 that passes through parting line PL when upper drain member 320 is viewed from the direction of axis O2. This configuration allows drain member 400 to be obtained with a simple mold structure.

[0081] 9C, the bent portion 321E is formed, for example, at a position corresponding to the peripheral edge of the pilot hole 11H formed in the bottom plate 11 of the eaves gutter 10 on the lower surface 321B of the upper flange portion 321. Specifically, it is formed at a position corresponding to the upper surface corner 11E of the bottom plate 11 on the peripheral edge of the pilot hole 11H, and if the pilot hole 11H has a circular shape, the bent portion 321E is formed at a position along a circle with a diameter that is approximately the same as or slightly smaller than that of the pilot hole 11H. It is preferable that the bent portion 321E is located at the same position as the upper corner 11E of the bottom plate 11, but it may also be located near the peripheral edge of the pilot hole 11H, where the flat surface on the outer periphery is stably positioned on the upper surface of the bottom plate with adhesive or the like sandwiched therebetween.

[0082] The diameter of the pilot hole may be marked on the upper drain member 320 so that it can fit into the diameter of the alignment portion (bent portion 321E). There are no particular restrictions on the method for marking the diameter of the pilot hole on the upper drain member 320, but it may be marked or printed. With this configuration, the installer can easily recognize the diameter of the pilot hole when drilling the pilot hole in the eaves gutter, improving workability.

[0083] In addition, in a cross section including the tube axis O2, the bent portion 321E is formed by bending the boundary between the flat lower side surface (flat surface) 321B of the upper flange portion 321 located outer circumferentially of the pilot hole 11H and the protruding outer circumferential surface (protruding surface) 323B of the inner-cylinder reduced diameter portion 323 located inner circumferentially and protruding downward. In other words, the bent portion 321E is formed at the connection portion between the lower side surface (flat surface) 321B of the upper flange portion 321 and the protruding outer circumferential surface (protruding surface) 323B of the inner-cylinder reduced diameter portion 323. The bent portion 321E is partially formed in the circumferential direction around the pilot hole 11H.

[0084] Here, the bent portion 321E refers to a recessed portion that opens at an angle greater than 90° between the flat surface and the protruding surface (or the tangent direction at the boundary if the protruding surface is curved). The intersection angle on the lower side is preferably 120° or greater, and more preferably 150° or greater. In order to stably catch on the upper corner of the pilot hole 11H, the intersection angle is preferably 160° or less, for example.

[0085] The bent portion 321E catches on an upper surface corner 11E formed on the upper surface 11A of the peripheral portion of the pilot hole 11H formed in the bottom plate 11, thereby suppressing misalignment of the upper drain member 320 with respect to the pilot hole 11H and enabling positioning of the upper drain member 320. The bent portion 321E is also partially provided on the outer peripheral surface of the upper flange portion 121. Therefore, even if a defectively machined portion (edge, burr, etc.) is formed in part of the pilot hole 11H, the upper drain member 120 can be positioned with respect to the pilot hole 11H by avoiding the defectively machined portion and bringing the bent portion 321E into contact with the inner peripheral surface of the pilot hole 11H. This allows the drain member 400 to be easily installed.

[0086] Furthermore, according to the drain member 400 of the third embodiment, since the upper drain member 320 has a bent portion 321E, there is no need for a step portion 126 based on the inner surface (inner wall surface) of the pilot hole 11H, and therefore the adhesive applied to the lower surface 121B of the upper flange 121 drips along the curved surface of the protruding outer surface (protruding surface) 323B, thereby preventing the adhesive from dripping onto the inner surface of the pilot hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 400 can be positioned stably with high quality relative to the pilot hole 11H.

[0087] Furthermore, according to the drain member 400, the lower drain member 110 is provided with an insertion guide portion (continuously reducing inner diameter surface) 113G, so that the inner tube portion 122 of the upper drain member 320 can be smoothly inserted into the outer tube portion 112 of the lower drain member 110.

[0088] 9D, the outer tube reduced diameter portion 113 may have a step. Specifically, the outer tube reduced diameter portion 113 includes a large diameter portion 113A that forms the upper end of the outer tube reduced diameter portion 113 and that reduces in diameter from the upper end downward, and a small diameter portion 113B that is connected to the lower end of the large diameter portion 113A and has a smaller diameter than the large diameter portion 113A. The large diameter portion 113A and the small diameter portion 113B are arranged coaxially with the tube axis O1. An insertion guide portion (continuously reduced inner diameter surface) 113G is formed on the inner peripheral surface of the large diameter portion 113A. According to this configuration, an insertion guide portion (continuously reducing inner diameter surface) 113G is formed on the inner circumferential surface of the large diameter portion 113A that forms the upper end of the outer tubular portion 11. Therefore, when attaching the inner tubular portion 122 of the upper drain member 320 to the outer tubular portion 112 of the lower drain member 110, the inner tubular portion 122 of the upper drain member 320 can be guided downward along the insertion guide portion (continuously reducing inner diameter surface) 113G of the large diameter portion 113A, and the inner tubular portion 21 can be inserted into the inside of the outer tubular portion 11.

[0089] <Fourth embodiment> Hereinafter, the fourth embodiment of the present invention will be described with reference to FIGS. 10A and 10B. Fig. 10A is a longitudinal cross-sectional view illustrating the schematic configuration of a drain member according to a fourth embodiment in an assembled state, and Fig. 10B is a longitudinal cross-sectional view illustrating the same in an exploded state, in which the siphon portion is omitted from Figs. 10A and 10B. 10A and 10B, reference numeral 500 denotes a drain member (drain member), and reference numeral 420 denotes an upper drain member.

[0090] As shown in Figures 10A and 10B, the drain member (drain member) 500 includes, for example, a lower drain member 310, an upper drain member 420, and a siphon portion (not shown) arranged above the upper drain member 420. The upper drain member 420 is the same as that in the second embodiment, so it is given the same reference numeral and the description thereof will be omitted.

[0091] As shown in Figure 3, the upper drain member 420 includes, for example, an upper flange portion 321 arranged on the upper surface 11A of the eaves gutter 10 and having a drop opening portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion 321 and extending downward, and having an outer thread portion 125 formed on its outer periphery, and an inner tube tapering portion 123 connecting the upper ends of the upper flange portion 121 and the inner tube portion 122 and tapering in diameter as it extends downward. 9E, the upper drain member 420 has a step portion 126 partially disposed on the lower surface 321B of the upper flange portion 321. The number, arrangement, etc. of the step portions 126 are as described above, and therefore will not be described again.

[0092] The lower drain member 310 differs from the lower drain member 110 in that the inner circumferential thread portion 115 is formed at a distance from the upper end portion 112U of the outer tubular portion 112L. As the rest is the same as in the third embodiment, the same reference numerals are used and the description will be omitted.

[0093] According to the drain member (drain member) 500 of the fourth embodiment, the lower drain member 310 is provided with an insertion guide portion (continuously reduced inner diameter surface) 113G, and the inner peripheral thread portion 115 is formed at a distance from the upper end portion 112U of the outer tube portion 112L, so that the lower drain member 310 and the upper drain member 420 can be assembled efficiently and stably while preventing diagonal engagement between them. Specifically, even if the upper drain member 420 and the lower drain member 310 are inserted at an angle when they are attached to each other, the threaded portions can be screwed together after the pipe axis O1 of the upper drain member 420 and the pipe axis O2 of the lower drain member 310 are made coaxial by the gap between the inner circumferential thread portion 115 and the upper end 112U of the outer tubular portion 112L before the tip of the inner tubular portion 122 having the outer circumferential thread portion 125 of the upper drain member 420 comes into contact with the inner circumferential thread portion 115 of the lower drain member 310. This makes it possible to prevent the screws from being fitted at an angle. In this case, it is preferable that the outer peripheral thread portion 125 of the upper drain member 420 is cut all the way to the lower end of the inner cylindrical portion 122. If the outer peripheral thread portion 125 of the upper drain member 420 is cut all the way to the lower end of the inner cylindrical portion 122, the length of the drain member 500 in the height direction can be reduced when the upper drain member 420 is combined with the lower drain member 310. This allows the drain member 500 to be made compact and to have an excellent aesthetic appearance.

[0094] Furthermore, according to the drain member 500, the upper drain member 420 is provided with the bent portion 321E, so that the drain member 500 can be stably positioned with high quality relative to the pilot hole 11H.

[0095] During construction, the screws (inner peripheral thread portion 115 and outer peripheral thread portion 125) engage at a position close to the bottom plate 11 of the gutter, thereby increasing the engagement force between the upper drain member 120, 320, 420 and the lower drain member 110, 210, 310. On the other hand, as explained in the second and fourth embodiments, if the screws (inner peripheral thread portion 115 and outer peripheral thread portion 125) engage at a position close to the bottom plate 11 of the gutter, there is an increased risk of the upper drain member 120, 320, 420 and the lower drain member 110, 210, 310 engaging at an angle. From the viewpoint of achieving both the engagement force between the upper drain members 120, 320, 420 and the lower drain members and the prevention of diagonal engagement, it is preferable that the relationship between the various lengths of the structures of the upper drain members 120, 320, 420 and the lower drain members 110, 210, 310 be set as follows, as shown in FIG. 8B, for example.

[0096] The length L41 of the inner cylindrical portion from the upper end of the inner cylindrical portion 122 of the upper drain member 120, 320, 420 to the upper end of the outer peripheral thread portion 125 is preferably 10 to 20 mm. The outer diameter L42 of the inner cylindrical portion 122 is preferably 75 to 135 mm. The inner diameter L43 of the outer cylindrical portion 112L is preferably 80 to 140 mm. The length L44 of the outer peripheral thread portion 125 and the inner peripheral thread portion 115 is preferably 20 to 40 mm. The lengths of the outer peripheral thread portion 125 and the inner peripheral thread portion 115 are not limited to being the same, and different lengths may also be used. The length L45 of the outer cylindrical portion 112L is preferably 25 to 80 mm. The length L45 of the outer cylindrical portion 112L is more preferably 40 to 65 mm.

[0097] Furthermore, a shorter length of the inner thread portion 115 is preferable because this reduces the number of times the upper drain member 120, 320, 420 needs to be turned during installation, making installation easier. Therefore, the length of the inner thread portion 115 may be shorter than the length of the outer tubular portion 112L. In this case, from the viewpoint of ensuring the coupling force between the upper drain member 120, 320, 420 and the lower drain member 110, 210, 310, it is preferable that the outer tubular portion 112L extend below the lower end of the inner thread portion 115. The outer tubular portion 112L extending below the lower end of the inner thread portion means that the lower end of the inner thread portion 115 and the lower end 112T of the lower drain member are spaced apart.

[0098] As described above, the drain member of the present disclosure has a bottom plate 11 and side plates extending upward from both ends of the bottom plate 11 in the width direction, and is a drain member to be attached to an eaves gutter having a pilot hole 11H formed in the bottom plate 11, and includes lower drain members 110, 210, 310 having: a lower flange portion 111 arranged on the underside of the bottom plate 11 and having a receiving port formed on its inner periphery; an outer cylinder portion 112L formed below the lower flange portion 111 and extending downward; an outer cylinder reduced diameter portion 113 connecting the upper ends of the lower flange portion 111 and the outer cylinder portion 112L and having a diameter that decreases as it extends downward; and an inner peripheral thread portion 115 formed on the inner peripheral surface of the outer cylinder portion 112L; and an upper drain member 120, 320, 420 having an upper flange portion 121, 321 with a drop portion 121H formed on its inner periphery, an inner tube portion 122 formed below the upper flange portion and extending downward and inserted into the outer tube portion 112L, an inner tube reduced diameter portion 123 connecting the upper end of the upper flange portion 121, 321 and the inner tube portion 122 and reducing in diameter as it extends downward, and an outer peripheral thread portion 125 formed on the outer peripheral surface of the inner tube portion 122 and threadedly engaging with the inner peripheral thread portion 115, and the upper drain member 120, 320, 420 has an alignment portion partially positioned on the lower surface of the upper flange portion 121, 321 at a position corresponding to the periphery of the pilot hole 11H. With this configuration, the alignment portion partially provided on the outer peripheral surface of the upper flange portion 121, 321 contacts the inner peripheral surface of the pilot hole 11H for the eaves gutter, thereby positioning the upper drain member relative to the pilot hole 11H. Because the pilot hole 11H for the eaves gutter is drilled manually, it may not necessarily be circular with precision, or imperfections such as edges or burrs may be formed on the inner peripheral surface. For example, if the alignment portion were continuously formed on the outer peripheral surface of the upper flange portion 121, 321, the alignment portion could get caught on the imperfections, preventing the upper drain member 120, 320, 420 from fitting into the pilot hole 11H, resulting in an installation failure. If an installation failure occurs as described above, it may be necessary to readjust the size or precision of the pilot hole 11H. As in the present disclosure, if the alignment portion is partially provided on the outer peripheral surface of the upper flange portions 121, 321, even if a defectively machined portion is formed in part of the pilot hole 11H, the upper drain member can be positioned relative to the pilot hole 11H by avoiding the defectively machined portion and bringing the alignment portion into contact with the inner peripheral surface of the pilot hole 11H. This makes it possible to provide a drain member with excellent workability.

[0099] The alignment portion may be the bent portion 321E. With this configuration, upper flange 321 has bent portion 321E partially provided on the outer peripheral surface thereof. Therefore, a step portion that is inserted into the inner peripheral surface (inner peripheral wall surface) of pilot hole 11H and that is positioned based on the inner peripheral surface (inner peripheral wall surface) is not required, and therefore the step portion or the like does not come into direct contact with the inner peripheral surface of pilot hole 11H. Furthermore, adhesive applied to the lower surface of upper flange 321 is prevented from dripping into pilot hole 11H or through pilot hole 11H onto the inner peripheral surface of pilot hole 11H or the lower surface of bottom plate 11. As a result, the drain member 300 can be stably positioned with high quality relative to the pilot hole 11H, thereby providing the drain member 300 with excellent workability.

[0100] The alignment portion may be a step portion 126 . With this configuration, the upper flange portion 121 has a stepped portion 126 partially provided on its outer peripheral surface. Therefore, the stepped portion 126 partially provided on its outer peripheral surface comes into contact with the inner peripheral surface of the eaves gutter pilot hole 11H, thereby positioning the upper drain member 120 relative to the pilot hole 11H. As a result, the drain member 100 can be positioned accurately and efficiently relative to the pilot hole 11H. This allows the drain member 100 to be easily installed.

[0101] The alignment portions may be formed at equal intervals in the circumferential direction at the boundary between the flat surface on the outer circumferential side and the protruding surface on the inner circumferential side that protrudes downward. With this configuration, since alignment portions are formed at equal intervals on the outer peripheral surface of the upper flange portions 121, 321, it becomes easy to align the center of the pilot hole 11H coaxially with the central axis of the upper drain member 120, 320, 420, for example, and the upper drain member 120, 320, 420 can be stably positioned relative to the pilot hole 11H. Therefore, the drain members 100, 300, 400 can be made easy to install.

[0102] The alignment portion may be provided across the parting line PL, or may be provided at a position spaced 90 degrees from the parting line PL in the circumferential direction. If the alignment portion is provided across the parting line PL or at a position 90 degrees circumferentially away from the parting line, the alignment portion does not interfere with the mold structure when molding the drain members 100, 300, 400, and it is possible to mold the drain members 100, 300, 400 using only a slide core, for example. This simplifies the mold structure.

[0103] At least one alignment portion may be formed so that, in a plan view, it spans the position of the upper end portion 125A of the outer peripheral thread portion 125 of the upper drain member 120, 320, 420, or so that the upper end portion 125A of the outer peripheral thread portion 125 and the end portion 126A of the alignment portion are in the same position. At least one alignment portion spans the position of the upper end 125A of the outer peripheral thread portion 125 of the upper drain member 120, 320, 420 in a plan view. Therefore, for example, when molding is performed so that the upper end 125A of the outer peripheral thread portion is located on the parting surface of the mold, the alignment portion does not interfere with the mold structure when molding the drain, and molding can be performed using only a slide core, thereby simplifying the mold structure. Furthermore, for example, when molding is performed so that the upper end 125A of the outer peripheral thread portion 125 is located on the parting surface of the mold, if the upper end 125A of the outer peripheral thread portion 125 and the end 126A of the alignment portion are formed to be in the same position, in addition to the above-mentioned effect, since the end 126A of the alignment portion is located on the parting surface of the mold, defects during molding can be suppressed.

[0104] In the lower drain member 310, the inner peripheral thread portion 115 may be formed at a distance from the upper end portion 112U of the outer cylindrical portion 112L. In the lower drain member 310, the inner peripheral thread portion 115 is formed at a distance from the upper end portion 112U of the outer tubular portion 112L, so that when assembling the upper drain members 220, 420 to the lower drain member 310, the thread portion can be screwed together after the upper drain members 220, 420 are coaxial with the lower drain member 310. This makes it possible to prevent the upper drain members 220, 420 from being obliquely fitted to the lower drain member 310. Therefore, the drain members 300, 500 can be made easy to install.

[0105] The gutter piping structure 1 may include an eaves gutter 10, a drain member 100, a joint 20, and a downspout 30. With this configuration, the gutter piping structure 1 can be made easy to install.

[0106] 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.

[0107] For example, the shape of the siphon portion of the upper drain member 120, 320, or 420 is not limited to the above. An upper drain member 620 having a siphon portion as shown in FIGS. 11A and 11B may be used. The upper drain member 620 includes vertical ribs 630 connected to the upper surface of the upper flange 616 and the inner peripheral surface of the upper reduced diameter portion 614 at multiple circumferential positions, an upper inner tube 640 connected to the radially inner ends of the multiple vertical ribs 630, and a funnel portion 641 continuous with the upper end of the upper inner tube 640. In this case, as shown in FIG. 12(a), a linear portion 631 may be formed on the vertical rib 630 of the upper drain member 620. The linear portion 631 may also be a parting line PL. With this configuration, even for the upper drain member 620 having the funnel portion 641, a siphon portion can be molded by vertically drawing the mold. Therefore, the mold can have a simple structure, and the drain member can be manufactured with excellent manufacturability.

[0108] The shapes of the funnel portion 641 and the vertical ribs 630 are not limited to those shown in Figures 11A and 11B. For example, as shown in Figures 12(b) and 12(d), the vertical ribs 630 do not have to be connected to the surface of the upper inner cylinder 640. For example, as shown in Figure 12(c), the vertical ribs 630 do not have to be formed up to the upper end of the funnel portion 641.

[0109] Furthermore, the shape of the siphon portion may be an upper drain member 720 having a siphon portion as shown in FIGS. 13A and 13B. In the upper drain member 720, vertical ribs 730 are connected by connecting portions 731 on the radially inner side. The funnel portion 641 is supported from above by the vertical ribs 730 via the connecting portions 731. The vertical ribs 730 may support the funnel portion 641 from the side. The other configuration may be the same as that of the upper drain member 620 shown in FIGS. 11A and 11B, and therefore will not be described here. The funnel portion 641 may function as a dust screen.

[0110] For example, in the above embodiment, the drain member is described as siphon drain member 100 having siphon portion 150, but it is possible to arbitrarily set whether or not the drain member has siphon portion 150, and it may also be configured without siphon portion 150. The same applies to drain members 200, 300, 400, 500. Furthermore, the combination of lower drain members 110, 210, 310 and upper drain members 120, 220, 320 exemplified in the above embodiment may be arbitrarily set.

[0111] In addition, in the above embodiment, the insertion guide portion is described as being configured by the insertion guide portion (continuously reduced inner diameter surface) 113G formed on the outer tube reduced diameter portion 113 of the lower drain member 110 and the inner peripheral thread portion 115 of the lower drain member 310 formed at a distance from the upper end portion 112U of the outer tube portion 112L, but the configuration of the insertion guide is not limited to the above and may be set arbitrarily.

[0112] In the above embodiment, the lower drain member reduced diameter portion 113, 213 of the lower drain member 110, 210, 310 is described as being formed in a generally conical shape with a cross section including the pipe axis O1 that is reduced in diameter in a linear manner, but the configuration of the lower drain member reduced diameter portion 113, 213 can be set arbitrarily. For example, the cross section including the pipe axis O1 may be reduced in diameter in a curved manner, or may be formed by a slope that combines straight and curved lines. Also, a bulge may be formed within a range that does not cause the inner cylindrical portion 122 to get caught.

[0113] There are no particular limitations on the shapes of outer peripheral thread portion 125 and inner peripheral thread portion 115. For example, outer peripheral thread portion 125 may have a thread height that decreases downward. The outer peripheral thread portion 125 and the inner peripheral thread portion 115 may be fitted with a non-threaded structure. When the outer peripheral thread portion 125 and the inner peripheral thread portion 115 are mating portions, the shape of the mating portion may be any structure capable of maintaining the relative positions of the upper drain member 120 and the lower drain member 110 until the adhesive applied between the upper drain member 120 and the lower drain member 110 hardens. The shape of the mating portion is not limited to a structure having a threaded portion. As shown in FIG. 14 , for example, the inner peripheral mating portion may be an inner peripheral claw portion 131 formed on the inner peripheral surface of the outer cylindrical portion 112 of the lower drain member 110, and the outer peripheral mating portion may be an outer peripheral claw portion 132 formed on the outer peripheral surface of the inner cylindrical portion 122 of the upper drain member 120 and engaged with the inner peripheral claw portion.

[0114] The outer peripheral claws 132 may be provided continuously in the circumferential direction on the outer peripheral surface of the inner cylindrical portion 122, or may be provided on at least a portion of the outer peripheral surface of the inner cylindrical portion 122 in the circumferential direction. When the outer peripheral claws 132 are provided on a portion of the outer peripheral surface of the inner cylindrical portion 122 in the circumferential direction, for example, as shown in FIGS. 15(a) and 15(b), the outer peripheral claws 132 may be provided in multiple regions at equal intervals in the circumferential direction. Furthermore, as shown in FIG. 15(a), the inner cylindrical portion 122 may have notches 140 in the portions where the outer peripheral claws 132 are not provided. If the notches 140 are provided at equal intervals in the circumferential direction as shown in FIG. 15(a), when the upper drain member 120 is assembled to the lower drain member 110, the inner cylindrical portion 122 of the upper drain member 120 temporarily deforms radially inward, making it easier for the outer peripheral claws 132 to overcome the inner peripheral claws 131 of the lower drain member 110, thereby improving workability.

[0115] The inner peripheral claw portion 131 may also be provided continuously in the circumferential direction on the inner peripheral surface of the outer cylindrical portion 112, or may be provided on at least a portion of the inner peripheral surface of the outer cylindrical portion 122 in the circumferential direction. When the outer peripheral claws 132 are provided in multiple regions at equal intervals in the circumferential direction, the regions where the outer peripheral claws 132 are provided and the regions where they are not provided may be formed alternately in the circumferential direction and of equal length, as shown in FIG. 15( b). Furthermore, the regions where the inner peripheral claws 131 are provided may be provided at positions corresponding to the regions where the outer peripheral claws 132 are not provided. When the inner peripheral claws 131 and the outer peripheral claws 132 are provided in this manner, when assembling the lower drain member 110 and the upper drain member 120, the upper drain member 120 may be inserted into the lower drain member 110 so that the regions where the outer peripheral claws 132 of the upper drain member 120 are provided are aligned with the regions where the inner peripheral claws 131 of the lower drain member 110 are not provided, as viewed in the axial direction, and the upper drain member 120 may be rotated relative to the lower drain member 110 to engage the outer peripheral claws 132 with the inner peripheral claws 131.

[0116] 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]

[0117] 1. Gutter piping structure (piping structure) 10 Gutters 11 Bottom plate 11H pilot hole 11E Upper corner of pilot hole 12 Side panel 20 Elbow 30 Downpipe 100, 300, 400, 500 drain member 110, 210, 310 Lower drain member 111 Lower flange 111H Receiving hole 112, 112L outer cylinder 112H Outer cylinder inner hole 113 Outer cylinder reduced diameter part 113G Insertion guide part (continuously reduced inner diameter surface) 115 Inner circumference thread 213 Outer cylinder narrowing inclined portion 214 Step (protrusion) 120, 320, 420 Upper drain member 121, 321 Upper flange 121B, 321B Upper flange bottom surface 121H Drop-out section 122 Inner cylinder 122H Inner cylinder inner circumferential hole 122G Guide sleeve (guide tube, insertion guide) 123 Inner cylinder narrowed diameter section 123D Step 125 Outer thread 126 Step 321E Bend part 150 Siphon Section

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 having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving port formed on its inner periphery, an outer tubular portion formed below the lower flange portion and extending downward, an outer tubular reduced diameter portion connecting the lower flange portion and an upper end of the outer tubular portion and reducing in diameter as it extends downward, and an inner periphery mating portion formed on the inner periphery of the 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 portion formed on its inner periphery; an inner tubular portion formed below the upper flange portion, extending downward, and inserted into the 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 mating portion formed on the outer periphery of the inner tubular portion and threadedly mating with the inner periphery mating portion; Equipped with The upper drain member is a positioning portion partially disposed on the lower surface of the upper flange portion at a position corresponding to the peripheral edge of the pilot hole; A drain member characterized by:

2. The drain member according to claim 1, The alignment portion is a bent portion. A drain member characterized by:

3. The drain member according to claim 1, The alignment portion is a step portion. A drain member characterized by:

4. The drain member according to claim 1, The alignment portions are formed at equal intervals in the circumferential direction. A drain member characterized by:

5. The drain member according to claim 1, The alignment portion is provided across the parting line or at a position 90 degrees circumferentially away from the parting line. A drain member characterized by:

6. The drain member according to claim 1, The inner circumferential engagement portion is an inner circumferential thread portion, The outer peripheral fitting portion is an outer peripheral thread portion. A drain member characterized by:

7. The drain member according to claim 6, At least one of the alignment portions is formed so as to straddle the position of an upper end portion of the outer peripheral thread portion of the upper drain member in a plan view, or so that the upper end portion of the outer peripheral thread portion and an end portion of the alignment portion are located at the same position. A drain member characterized by:

8. The drain member according to claim 6, In the lower drain member, the inner peripheral thread portion is formed at a distance from the upper end portion of the outer cylindrical portion. A drain member characterized by:

9. A gutter having a bottom plate and side plates extending upward from both ends of the bottom plate in the width direction, with a pilot hole formed in the bottom plate; The drain member according to any one of claims 1 to 8; a downspout provided downstream of the drain member; a joint that connects the drain member and the downspout; A gutter piping structure comprising:

10. The gutter piping structure according to claim 9, A building characterized by having:

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