Drainage components and piping structures and buildings

Abstract

The present invention aims to provide drainage members and piping structures. [Solution] The present invention provides a drain member that is attached to a gutter having a bottom plate with a through hole and side plates extending upward from both ends in the width direction of the bottom plate, and connected to a downpipe via an elbow pipe, comprising: a lower drain member having a lower flange portion disposed on the lower surface of the bottom plate and having a receiving opening formed on its inner circumference, and an outer cylinder portion formed below the lower flange portion; and an upper drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop-off opening formed on its inner circumference, and an inner cylinder portion formed below the upper flange portion and inserted into the outer cylinder portion, wherein an inner cylinder diameter reduction portion is provided at the connection portion between the upper flange portion and the inner cylinder portion, and the upper drain member is provided with a plurality of vertical ribs spaced apart in the inner circumference direction of the inner cylinder portion, extending from the upper flange portion to the lower end of the diameter reduction portion.

Description

Technical Field

[0001] The present invention relates to a drainage member and a piping structure.

Background Art

[0002] In a large eaves gutter disposed at the eaves of a building such as a factory, a warehouse, or a shopping center, a siphon drain member having a high drainage function is widely used (see, for example, Patent Document 1).

[0003] This siphon drain member generally has a configuration including a lower drain member disposed on the lower surface side sandwiching the bottom plate of the eaves gutter, and an upper drain member disposed on the upper surface side and provided with a siphon portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since the eaves gutter is suspended at the tip of the eaves of the roof and installed at a position away from the wall surface of the building, in order to connect the drain member attached to the eaves gutter and the vertical gutter supported along the wall surface, it is necessary to connect through an elbow pipe with a large curvature or a horizontal pipe called a calling gutter. In large buildings such as factories and warehouses, there are many cases where the eaves are short, so it is necessary to connect elbow pipes with a small curvature radius that fit well in an S shape or shorten the calling gutter. In addition, in order to surely obtain the siphon effect, it is necessary to make a device such as setting the calling gutter to 2 m or less. However, if the aforementioned structure is adopted, and the building's roof is made of metal corrugated sheet metal, the thermal expansion and contraction of the roofing material causes the eaves gutter to move relative to the downpipe, and the stress associated with this relative movement concentrates at the joint of the drain member. Relative movement between the eaves gutter and downpipe can also occur due to wind pressure during strong winds. If the amount of relative movement is large, there is a risk of cracks forming at the joint of the drain member. Furthermore, even when using short downpipes or elbow pipes with a small radius of curvature to ensure a good fit, the deflection of the downpipe due to the aforementioned relative movement may cause cracks to form in part of the drain component. Furthermore, the aforementioned stress concentration may occur at the joint of the elbow pipe. Increasing the wall thickness of the elbow pipe or reinforcing the elbow pipe can prevent cracking of the elbow pipe. However, in this case, stress will concentrate on the drain member, which may cause cracks in the drain member.

[0006] This invention has been made in view of the circumstances described above, and aims to provide a drain member and a drain piping structure that employ a configuration that makes it difficult for stress to concentrate in the drain member. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention proposes the following embodiments. "1" The drain member according to this embodiment is a drain member that is attached to a gutter having a bottom plate with a through hole and side plates extending upward from both ends in the width direction of the bottom plate and connected to a downpipe via an elbow pipe, and comprises 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 circumference, and an outer cylinder portion formed below the lower flange portion, and an upper drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a drop-off port formed on its inner circumference, and an inner cylinder portion formed below the upper flange portion and inserted into the outer cylinder portion, wherein an inner cylinder diameter reduction portion is provided at the connection portion between the upper flange portion and the inner cylinder portion, the inner diameter of which decreases from the upper flange portion toward the inner cylinder portion, and the upper drain member is provided with a plurality of vertical ribs extending from the upper flange portion to the lower end of the inner cylinder diameter reduction portion, spaced apart in the inner circumference direction of the inner cylinder portion, and the lower end of the vertical ribs is positioned below the lower end of the inner cylinder diameter reduction portion.

[0008] With the drainage member described above, vertical ribs are formed from below the lower end of the inner cylinder's reduced diameter section, ensuring sufficient length of the vertical ribs and reinforcing the upper drain member. This eliminates the risk of cracks occurring in the upper drain member due to stress concentration caused by relative movement between the eaves gutter and the downpipe due to thermal expansion of the roof or wind pressure during strong winds.

[0009] "2" In the drainage member according to this embodiment, the connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion in which the inner diameter decreases from the lower flange portion toward the outer cylinder portion, and the lower end of the vertical rib is positioned below the lower end of the outer cylinder diameter reduction portion.

[0010] With the drainage member described above, the lower end of the vertical rib is positioned below the lower end of the outer cylinder's reduced diameter section, thus ensuring the length of the vertical rib and reliably improving the strength of the upper drain member with the vertical rib. Therefore, even if relative movement between the eaves gutter and the downpipe occurs due to thermal expansion of the roof or wind pressure during strong winds, causing stress to concentrate on the upper drain member, it is possible to provide a piping member that will not develop cracks in the upper drain member.

[0011] "3" In the drainage member according to this embodiment, the connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion that decreases in diameter from the lower flange portion toward the outer cylinder portion, the inner surface of the outer cylinder portion has an inner circumferential thread portion, the outer surface of the inner cylinder portion has an outer circumferential thread portion, and the lower end of the vertical rib is positioned below the lower end of the inner cylinder diameter reduction portion and above the upper end of the outer circumferential thread portion of the inner cylinder portion.

[0012] With the drain member described above, the lower end of the vertical rib is positioned below the lower end of the inner cylinder's reduced diameter portion and above the upper end of the inner circumferential thread portion of the outer cylinder, ensuring sufficient length of the vertical rib to reinforce the upper drain member, and allowing for a configuration in which there are no vertical ribs inside the area where the outer circumferential thread portion is formed. If vertical ribs exist inside the area where the outer thread portion is formed, when molding the upper drain member, the outer thread portion may deform due to thermal shrinkage after molding. If the outer thread portion deforms, the fitting with the inner thread portion may not be smooth, and the screw connection between the upper and lower drain members may not be possible. With the above configuration, deformation of the outer thread portion of the upper drain member is less likely to occur, so the screw connection between the upper and lower drain members can be reliably achieved. Furthermore, because the upper drain member is reinforced with vertical ribs, even if relative movement between the eaves gutter and downpipe occurs due to thermal expansion of the roof or wind pressure during strong winds, causing stress to concentrate on the upper drain member, it is possible to provide a drainage member that will not develop cracks in the upper drain member.

[0013] "4" In the drainage member according to this embodiment, a configuration can be adopted in which the thickness of the vertical ribs gradually decreases from the upper end to the lower end.

[0014] In a configuration where the vertical ribs become thinner towards the bottom, the flow of drainage through the vertical ribs becomes smoother, improving drainage performance.

[0015] "5" In the drainage member of this embodiment, a configuration can be adopted in which the longitudinal rib has an inner peripheral edge that extends to the center of the inner cylindrical portion on the inner peripheral side of the inner cylindrical portion.

[0016] By providing vertical ribs with inner peripheral edges that extend to the center of the inner cylinder, the flow of drainage passing through the inner cylinder can be made smoother while efficiently reinforcing the upper drain member.

[0017] "6" In the drainage member of this embodiment, a configuration can be adopted in which the vertical rib has a linear inclined portion or a curved inclined portion that extends to the center side of the inner cylinder portion.

[0018] With the drainage member described above, by providing a straight or curved inclined section, the area of ​​the vertical ribs can be reduced, minimizing the impact on the flow of wastewater passing through the inner cylinder, and a drainage member with reinforced lower drain members can be provided.

[0019] "7" The present piping structure is a piping structure in which a drain member is attached to a gutter having a bottom plate with a through hole and side plates extending upward from both ends in the width direction of the bottom plate, and the drain member is connected to a downpipe via an elbow pipe, wherein the drain member has a lower drain member having a lower flange portion disposed on the lower surface of the bottom plate with a receiving port formed on its inner circumference and an outer cylinder portion formed below the lower flange portion, and an upper drain member having an upper flange portion disposed on the upper surface of the bottom plate with a drop-off port formed on its inner circumference and an inner cylinder portion formed below the upper flange portion and inserted into the outer cylinder portion, At the connection portion between the upper flange portion and the inner cylinder portion, an inner cylinder diameter reduction portion is provided, where the inner diameter decreases as you move from the upper flange portion toward the inner cylinder portion. Multiple vertical ribs are provided on the upper drain member, extending from the upper flange portion to the lower end of the reduced diameter portion, spaced apart in the inner circumferential direction of the inner cylinder portion. The lower end of the vertical rib is positioned below the lower end of the inner cylinder diameter reduction portion.

[0020] In a piping structure equipped with the aforementioned drainage member, relative movement between the eaves gutter and downpipe occurs due to thermal expansion of the roof or wind pressure during strong winds, and even if stress concentrates on the upper drain member, the inner cylindrical part of the upper drain member is reinforced with vertical ribs of sufficient length, thus eliminating the risk of cracks occurring in the upper drain member. Therefore, it is a pipe structure that suppresses the occurrence of cracks in the upper drain member, and can provide a pipe structure having good drainage from the eaves gutter.

[0021] 「8」In the pipe structure of this embodiment, at the connection portion between the lower flange portion and the outer cylinder portion, there is an outer cylinder diameter-reducing portion whose inner diameter decreases from the lower flange portion toward the outer cylinder portion, and a configuration can be adopted in which the lower end of the vertical rib is positioned below the lower end of the outer cylinder diameter-reducing portion.

[0022] In the pipe structure provided with the above-described drain member, since the lower end of the vertical rib is provided below the lower end of the outer cylinder diameter-reducing portion, the strength of the upper drain member can be surely improved. For this reason, even if relative movement occurs between the eaves gutter and the downspout due to thermal expansion of the roof or wind pressure during strong winds, and stress is concentrated on the upper drain member, a pipe structure can be provided in which cracks do not occur in the upper drain member.

[0023] 「9」In the pipe structure of this embodiment, at the connection portion between the lower flange portion and the outer cylinder portion, there is an outer cylinder diameter-reducing portion whose inner diameter decreases from the lower flange portion toward the outer cylinder portion, the inner surface of the outer cylinder portion has an inner peripheral thread portion, the outer surface of the inner cylinder portion has an outer peripheral thread portion, and a configuration can be adopted in which the lower end of the vertical rib is positioned below the lower end of the inner cylinder diameter-reducing portion and above the upper end of the inner peripheral thread portion of the outer cylinder portion.

[0024] In the above-described pipe structure, the lower end of the vertical rib is provided below the lower end of the inner cylinder diameter-reducing portion and above the upper end of the inner peripheral thread portion of the outer cylinder portion, the length of the vertical rib can be sufficiently ensured to strengthen the upper drain member, and the vertical rib can be configured not to exist inside the region where the outer peripheral thread portion is formed. If the vertical rib exists inside the region where the outer peripheral thread portion is formed, when molding the upper drain member, the outer peripheral thread portion may be deformed due to thermal shrinkage after molding. If the outer peripheral thread portion is deformed, the fitting with the inner peripheral thread portion may not be smoothly performed, and the screw connection between the upper drain member and the lower drain member may not be possible. With the above-described configuration, the screw connection between the upper drain member and the lower drain member can be surely performed. Furthermore, because the upper drain member has been reinforced, even if relative movement between the eaves gutter and downpipe occurs due to thermal expansion of the roof or wind pressure during strong winds, causing stress to concentrate on the upper drain member, it is possible to provide a piping structure that prevents cracks from forming in the upper drain member.

[0025] "10" In this piping structure, a configuration can be adopted in which the thickness of the vertical ribs gradually decreases from the upper end to the lower end.

[0026] In a configuration where the vertical ribs become thinner towards the bottom, the flow of drainage through the vertical ribs becomes smoother, improving drainage performance. Therefore, it is possible to provide a piping structure with excellent drainage performance when draining from the eaves gutter through a drain member.

[0027] "11" In the piping structure of this embodiment, a configuration can be adopted in which the longitudinal rib has an inner peripheral edge that extends to the center of the inner cylindrical portion on the inner peripheral side of the inner cylindrical portion.

[0028] By providing longitudinal ribs with inner peripheral edges that extend to the center of the inner cylinder, the flow of drainage through the inner cylinder can be made smoother while efficiently reinforcing the upper drain member. As a result, a piping structure with excellent drainage performance can be provided while suppressing the occurrence of cracks in the upper drain member.

[0029] "12" In this piping structure, a configuration can be adopted in which the vertical rib has a linear inclined portion or a curved inclined portion that extends to the center side of the inner cylinder portion.

[0030] With a piping structure equipped with the aforementioned drainage member, it is possible to provide a piping structure that reinforces the lower drain member while minimizing the influence on the flow of drainage passing through the inner cylinder by reducing the area of ​​the vertical ribs by providing a straight or curved inclined section. [Effects of the Invention]

[0031] With the drainage member or piping structure equipped with the drainage member according to the present invention, relative movement between the eaves gutter and the downpipe occurs due to thermal expansion of the roof or wind pressure during strong winds, and even if stress concentrates on the upper drain member, the upper drain member is reinforced with vertical ribs, thus eliminating the risk of cracks occurring in the upper drain member. [Brief explanation of the drawing]

[0032] [Figure 1] A partial cross-sectional view showing the drainage piping structure of a gutter equipped with a drainage member according to the first embodiment of the present invention. [Figure 2] An exploded view of the drainage member according to the first embodiment. [Figure 3] A cross-sectional view showing a part of the drainage member according to the first embodiment. [Figure 4] A partial cross-sectional view showing conventional drainage components and gutter drainage piping structure. [Figure 5] A partial cross-sectional view showing a second example of a gutter drainage piping structure to which the configuration of the first embodiment can be applied. [Figure 6] A partial cross-sectional view showing a third example of a gutter drainage piping structure to which the configuration of the first embodiment can be applied. [Figure 7] A partial cross-sectional view showing a drainage member according to a second embodiment of the present invention. [Figure 8] A partial cross-sectional view showing a drainage member according to a third embodiment of the present invention. [Figure 9] A partial cross-sectional view showing a drainage member according to a fourth embodiment of the present invention. [Figure 10] A partial cross-sectional view showing a drainage member according to a fifth embodiment of the present invention. [Figure 11] A partial cross-sectional view showing a drainage member according to a sixth embodiment of the present invention. [Figure 12] A cross-sectional view of a seventh embodiment showing a drain member applicable to the drainage member according to the present invention. [Figure 13] A cross-sectional view showing a first modified example of a drain member applicable to the drainage member according to the present invention. [Figure 14] A perspective view showing a second modified example of a drain member applicable to the drainage member according to the present invention. [Figure 15] A partial cross-sectional view showing a drainage piping structure for an eaves gutter, which includes a drainage member according to a first embodiment of the present invention and has an expansion joint between the drain member and the elbow pipe. [Figure 16] A partial cross-sectional view showing a drainage piping structure for a gutter, which includes a drainage member according to the first embodiment of the present invention and has an expansion joint at the lower part of the elbow pipe. [Figure 17] This shows a third modified example of a drain member applicable to the drainage member according to the present invention, where (A) is a cross-sectional view and (B) is a plan view. [Figure 18] This shows a fourth modified example of a drain member applicable to the drainage member according to the present invention, where (A) is a cross-sectional view and (B) is a plan view. [Figure 19] This shows other variations of the drain member applicable to the drainage member according to the present invention, where (A) is a plan view of the 5th variation, (B) is a plan view of the 6th variation, (C) is a plan view of the 7th variation, (D) is a plan view of the 8th variation, and (E) is a plan view of the 9th variation. [Modes for carrying out the invention]

[0033] "First Embodiment" The following describes an example of applying the drainage member according to the first embodiment of the present invention to a gutter drainage piping structure, with reference to Figures 1 to 3. The drainage member according to this embodiment is applied to the drainage piping structure of a gutter installed at the eaves of a corrugated metal roof. As shown in Figure 1, the corrugated metal roof 1 is formed at the upper end of the building's wall section 2 and has a structure in which peaks 3 and valleys 4 made of metal plates are alternately formed in a corrugated pattern. Figure 1 is a partial cross-sectional view of the eaves and wall section 2 of the corrugated metal roof 1, and a rectangular frame-shaped gutter support 6 is fixed by multiple mounting bolts 5 that penetrate vertically through the metal plates that make up the peaks 3 of the eaves. The gutter 7 is suspended and supported by a gutter support 6, and a drain member 8 is attached to the bottom of the gutter 7. A downpipe 12 is connected to the lower part of this drain member 8 via two elbow pipes 10 and 11. Since the gutter 7 is supported below the eaves of the corrugated metal roof 1, it can receive rainwater flowing down from the eaves. The downpipe 12 is vertically supported by several mounting brackets (not shown) attached to several locations along the wall 2, and is connected to a drainage channel (not shown) buried in the ground near the building, allowing rainwater to be drained.

[0034] In the corrugated metal roof 1 shown in Figure 1, the roof slope is slightly downward from right to left, and the left end of the corrugated metal roof 1 is the eaves. The eaves extend in the direction of the front and back of the paper in Figure 1, and multiple gutter supports 6 are fixed at predetermined intervals along the extended eaves, and the gutter 7 is supported by these multiple gutter supports 6. Since Figure 1 is a partial cross-sectional view showing only a part of the eaves, only one gutter support 6 and one gutter 7 are depicted. The gutter 7 is suspended almost horizontally, supported by the gutter support 6. The gutter 7 consists of a bottom plate 7A and side plates 7B, 7B formed to rise upward from the left and right ends of the bottom plate 7A as shown in Figure 1. The front-back direction of Figure 1 is the length direction of the gutter 7, and the left-right direction of Figure 1 is the width direction of the gutter 7. A through hole 7H for attaching a drain member 8 is formed in the center of the width direction of the bottom plate 7A.

[0035] In this embodiment, the gutter 7 is an extruded product made of, for example, rigid polyvinyl chloride resin, ABS, AES, or other synthetic resin. The material used to form the gutter 7 can be arbitrarily selected and is not limited to synthetic resins; for example, it may be made of an extruded metal product.

[0036] Furthermore, when forming the gutter 7 with synthetic resin, the coefficient of linear expansion should be 2.0 × 10 to prevent thermal expansion and contraction. -5It is preferable that the temperature is below / ℃. Furthermore, it is preferable to reduce the coefficient of linear expansion by inserting a low-stretch sheet, such as a PET resin sheet or an iron sheet stretched to the center in the thickness direction of the gutter 7, or by incorporating low-stretch additives such as wollastonite or carbon fiber into the synthetic resin that makes up the gutter 7. The eaves gutter 7 has a base width of 100 mm or more and 200 mm or less, and a height of 90 mm or more and 150 mm or less. It may be applied to a large-diameter eaves gutter that can carry rainwater at a flow rate of 4 liters / sec or more and 20 liters / sec or less.

[0037] As shown in Figures 1 and 2, the siphon drain member (drain member) 8 comprises, for example, a lower drain member 15, an upper drain member 16, and a siphon section 17 positioned above the upper drain member 16, and is attached to the gutter 7. Specifically, as shown in Figure 2, the lower drain member 15 is positioned on the lower surface 7D side of the bottom plate 7A of the gutter 7, and the upper drain member 16 is positioned on the upper surface 7E side of the bottom plate 7A.

[0038] The material used to form the siphon drain member 8 can be arbitrarily selected. In this embodiment, the siphon drain member 8 is an injection-molded product formed from, for example, a synthetic resin such as rigid polyvinyl chloride resin, polycarbonate, ABS, or AES. However, it is not limited to synthetic resins; the siphon drain member 8 may also be formed by casting cast iron, stainless steel, or aluminum. The detailed structures of the lower drain member 15 and the upper drain member 16 will be explained later; first, the siphon section 17 will be described. As shown in Figure 2, the siphon section 17 includes, for example, a lid member 18, a vertical rib 19 connecting the upper drain member 16 and the lid member 18, a gripping rib 20, and a guide 21. The siphon section 17 is also integrated with the upper part of the upper drain member 16.

[0039] The lid member 18 is formed, for example, as a circular disc in plan view, positioned above the upper drain member 16. Furthermore, the lid member 18 is formed coaxially with the pipe axis O1 of the upper drain member 16. As shown in Figure 2, the portion formed between the outer peripheral edge 18A of the lid member 18 and the outer peripheral edge 31C of the upper flange portion 31 provided on the upper drain member 16 constitutes the inflow opening 23. The inflow opening 23 constitutes an opening for rainwater accumulated in the eaves gutter 7 to flow into the outlet portion 22 of the upper drain member 16, which will be described later.

[0040] The size, height, and shape of the lid member 18 are adjusted so that the area of ​​the inlet opening 23 is larger than the opening area of ​​the drain opening 22, which will be described later based on Figure 3. In this embodiment, the area of ​​the inlet opening 23 can be determined by the product of the circumference of the circular lid member 18, i.e., the length of the outer edge 18A, and the height H of the lid member 18. The lid member 18 is supported by the upper drain member 16 while being supported from below by a plurality of vertical ribs 19. As a result, the vertical ribs 19, which are spaced apart from each other, are connected by the lid member 18, so that the uneven stress applied to the upper drain member 16 is distributed to the vertical ribs 19 connected to the lid member 18, thereby distributing the stress applied to the inner cylinder portion 32 and the inner cylinder reduced diameter portion 33. The cover member 18 is positioned inside the gutter 7, spaced above the outlet 22, and forms an inlet opening 23 that allows rainwater to flow from the upper surface 7E of the gutter 7 into the outlet 22. The cover member 18 is preferably set at a height H that extends upward from the upper surface 7E of the gutter 7, for example, at a position of 10 to 60 mm.

[0041] The size of the lid member 18 when viewed from above can be set arbitrarily, but it is preferable that it be positioned to cover the opening of the drain portion 22 when viewed from above, and that it be set to be larger than the opening area of ​​the drain portion 22. The size of the lid member 18 may be set to be equal to the opening area of ​​the drain portion 22, or to be smaller than the opening area. Furthermore, a through hole may be formed in the lid member 18 in the vertical direction, penetrating from the top surface to the drain opening 22. Note that the lid member 18 is not essential for the drain member, so a structure without a lid member will be described in a later modification of the drain member.

[0042] Preferably, the height H of the cover member 18 is set to a position, for example, 30 to 40 mm above the bottom plate 7A of the gutter 7, and the diameter of the cover member 18 is set to 150 to 200% of the outer diameter R1 of the opening of the downspout 22. To ensure stable siphon action, the height of the lid member 18 is preferably 0.1 to 0.5 times the maximum water level in the gutter 7, and more preferably 0.2 to 0.45 times. The maximum water level in the gutter 7 is defined as the lowest height from the bottom plate 7A on the side plate 7B of the gutter 7.

[0043] A suitable inner diameter for the outlet portion 22 for providing the lid member 18 is, for example, 50 mm to 170 mm, and more preferably 70 mm to 170 mm. That is, by setting the inner diameter of the outlet portion 22 to the lower limit of 50 mm or more, the large flow rate of wastewater generated in the siphon portion 17 can be drained smoothly. By making the inner diameter of the outlet section 22 170 mm or less, the overall size is reduced, preventing the need for larger joints and support fixtures.

[0044] As shown in Figure 2, the lid member 18 is provided with gripping ribs 20 that protrude upward from the upper surface 18B and are spaced apart in the circumferential direction. By gripping these gripping ribs 20, the rotational operation when tightening the siphon drain member 8 can be easily performed.

[0045] A guide guide 21 is provided at the center of the lower surface of the lid member 18. As shown in Figure 2, the guide guide 21 is provided at the center of the lower surface of the lid member 18, and consists of multiple guide guides 21 that extend radially from the drain axis O, each having a curve that gradually extends downward toward the drain axis O (center of the lid). The guide 21 is for guiding rainwater in the gutter 7 from the inlet opening 23 to the outlet (opening of the outlet 22). The guidance guide 21 may also be formed by a funnel-shaped or cylindrical wall portion with holes formed at its upper and lower ends.

[0046] The siphon section 17 blocks the opening of the downspout section 22 when viewed from above, and when a large amount of rainwater flows in through the inflow opening 23 during heavy rain, it prevents air from being drawn in and seals the downpipe 12 by filling it with water. As a result, it generates a siphon effect on the downstream side, providing high drainage functionality. Such a siphon drain member 8 is installed, for example, inside the gutter 7 of a rain gutter drainage piping structure attached to a building of a large facility such as a factory or shopping center, and exhibits high drainage functionality.

[0047] As shown in Figures 2 and 3, the upper drain member 16 is positioned on the upper surface of the bottom plate 7A of the gutter 7 and includes an upper flange portion 31 with a drain outlet portion 22 formed on its inner circumference, an inner cylinder portion 32 formed below the upper flange portion 31, an inner cylinder diameter reduction portion 33 that connects the upper flange portion 31 and the inner cylinder portion 32 and decreases in diameter as it goes downward, and an outer circumference threaded portion 35 formed on the outer surface of the inner cylinder portion 32. The inner cylinder portion 32 is inserted into the outer cylinder portion 42 of the lower drain member 15, which will be described later, and the outer threaded portion 35 and the inner threaded portion 44, which will be described later, are screwed together. This screwing integrates the upper drain member 16 and the lower drain member 15, forming the siphon drain member 8. In the upper drain member 16, the inner surface of the inner cylinder portion 32 and the upper surface of the portion where the upper flange portion 31 is connected are formed into a bell mouth shape with a tapered or curved surface. The outer threaded portion 35 is formed from the lower end position of the inner cylinder portion 32 to a position slightly below the lower end of the inner cylinder reduced diameter portion 33.

[0048] The upper flange portion 31 is formed in a ring shape when viewed from above. The lower surface 31B of the upper flange portion 31 is positioned on the upper surface of the bottom plate 7A of the gutter 7. On the lower surface 31B of the upper flange portion 31, a flat surface is formed on the outer circumference, and a positioning step portion 36 is formed on the inner circumference of the flat surface, consisting of a cylindrical portion that protrudes downward. The upper drain member 16 is positioned relative to the through-hole 7H by the positioning step portion 36 contacting the inner circumference of the through-hole 7H of the gutter 7.

[0049] Multiple vertical ribs 37 are formed on the inside of the upper drain member 16, extending from the upper flange portion 31 to the inner cylinder portion 32. In the example shown in Figure 3, five vertical ribs 37 are formed at regular intervals in the inner circumferential direction of the inner cylinder portion 32. The vertical ribs 37 are formed to protrude from the inner circumferential surface of the upper flange portion 31 and the inner circumferential surface of the inner cylinder portion 32 toward the pipe axis O1 of the upper drain member 16. Therefore, when a vertical cross-section of the upper drain member 16 including the pipe axis O1 is displayed as shown in Figure 3, vertical ribs 37 are drawn in the center and on both sides, but the central vertical rib 37 is drawn as a flat plate in the vertical direction along the pipe axis O1. The vertical rib 37 is formed to extend from the upper surface of the upper flange portion 31 to a position slightly below the upper end of the area where the outer thread portion 35 is formed.

[0050] The vertical rib 37 has its upper end surface 37A flush with the upper surface of the upper flange portion 31, and its lower end surface 37B positioned slightly below the upper end of the area where the outer thread portion 35 is formed. As shown in Figure 3, the width of the protrusion on the bottom side of the longitudinal rib 37, which is formed on the inside of the inner cylinder portion 32, is almost constant. In contrast, since the upper surface of the upper flange portion 31 is curved, a wide extension portion 37D is formed on the upper side of the longitudinal rib 37 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 37A of the longitudinal rib 37, which corresponds to the upper surface of the extension portion 37D, is formed flush with the upper surface of the upper flange portion 31. For example, the distance from the lower end surface 37B of the vertical rib 37 to the upper surface of the upper flange portion 31 (a1 = height of the vertical rib 37) is formed to be approximately 20 mm or more.

[0051] As shown in Figure 3, the lower drain member 15 comprises a lower flange portion 41 positioned on the lower surface 7D side of the gutter 7, and an outer cylinder portion 42 integrally formed below the lower flange portion 41 and extending downward. Furthermore, the lower drain member 15 comprises an outer cylinder reduced diameter portion 43 connecting the lower flange portion 41 and the outer cylinder portion 42, and an inner circumferential thread portion 44 formed on the inner surface of the outer cylinder portion 42.

[0052] The lower flange portion 41 is formed in a ring shape in plan view, and a circular receiving opening 41H is formed on the inner side in plan view. In the lower flange portion 41, a flat surface is formed on the upper surface 41A on the outer circumference, and the inner circumference has a recessed shape that is lower than the flat surface. The upper surface 41A of the lower flange portion 41 is positioned on the lower surface 7D side of the bottom plate 7A of the gutter 7.

[0053] The outer cylinder portion 42 is formed, for example, in a cylindrical shape centered on the pipe axis O2, and extends vertically when attached to the gutter 7. An inner circumferential hole 42H extending in the vertical direction is formed inside the outer cylinder portion 42. On the inner surface of the outer cylinder portion 42, an inner circumferential thread portion 44 is formed below the circumferential step portion 43A formed at the lower end of the outer cylinder reduced diameter portion 43. The inner circumferential thread portion 44 is formed from the inside of the circumferential step portion 43A to the bottom side of the outer cylinder portion 42. In the example shown in Figure 3, the outer threaded portion 35 and the inner threaded portion 44 are fitted together and screwed together, and with the bottom plate 7A of the gutter 7 sandwiched between the upper flange portion 31 and the lower flange portion 41, the upper end of the outer threaded portion 35 is positioned inside the circumferential step portion 43A.

[0054] Furthermore, four recesses 45, which are shaped to curve upwards, are provided on the outer circumference of the lower end of the outer cylinder portion 42, for example, at 90° intervals in the circumferential direction. The recesses 45 are tool mounting recesses for attaching a tool from below. When screwing the inner circumferential thread portion 44 into the outer circumferential thread portion 35 of the inner cylinder portion 32 and integrating the lower drain member 15 with the upper drain member 16, the screwing operation can be easily performed by using the recesses 45 and a tool.

[0055] As shown in Figure 1, the elbow pipes 10 and 11 located below the lower drain member 15 each have a curved pipe and cylindrical receiving portions integrally formed on both ends of the curved pipe. For example, elbow pipe 10 has a curved pipe 10A and receiving portions 10B, 10B. Elbow pipe 11 has a curved pipe 11A and receiving portions 11B, 11B. In this embodiment, the elbow pipes 10 and 11 may have a radius of curvature of 64 mm or less on the inner and outer walls of the inner circumference when viewed in a cross-section in a plane including their pipe axis. The smaller the radius of curvature of the elbow pipes 10 and 11, the more easily stress concentrates, making it easier to obtain the effects described later in this embodiment.

[0056] In the example shown in Figure 1, the curved pipes 10A and 11A are shown to have a bending angle of 45°. A bending angle of 45° means that the angle between the central axes of the cylindrical socket portions 10B and 10B is 45°, and the angle between the central axes of the cylindrical socket portions 11B and 11B is 45°. Furthermore, the elbow pipe 10 is made compact by minimizing the length of the curved section. For this reason, the end 10B' of one socket 10B located on the inside of the curved section of the curved pipe 10A and the end 10B' of the other socket 10B are located in close proximity. Similarly, in the elbow pipe 11, the end 11B' of one socket 11B located on the inside of the curved section of the curved pipe 11A and the end 11B' of the other socket 11B are located in close proximity.

[0057] As shown in Figure 1, the elbow pipes 10 and 11 are joined in an S-shape when viewed from the side, with the lower end of the outer cylinder portion 42 inserted into the socket portion 10B of the upper elbow pipe 10. The upper end of the downpipe 12 is inserted into the socket portion 11B of the lower elbow pipe 11. In the structure of this embodiment, the connection parts between each pipe are sealed by applying adhesive or the like to fill any gaps. Since the elbow pipes 10 and 11 are joined in an S-shape, the upper end of the downpipe 12, which is supported closer to the wall 2, can be connected to the lower drain member 15 located directly below the gutter 7, thus creating a neat and tidy piping structure.

[0058] In the piping structure shown in Figure 1, the gutter 7 moves slightly in the left-right direction in Figure 1 due to thermal contraction of the corrugated metal roof 1 or wind pressure during strong winds, causing stress to concentrate on the lower drain member 15. However, since multiple vertical ribs 37 are provided to reinforce the lower drain member 15, cracks and other damage do not occur in the lower drain member 15.

[0059] "Conventional piping structure" Figure 4 shows a conventional piping structure in which a connection point 8A is formed at the lower end of a drain member 8 attached to the gutter 7, this connection point 8A is directly connected to an elbow pipe 50, a horizontal pipe called a downpipe 34 is connected to the other end of the elbow pipe 50, and the other end of the downpipe 34 is connected to a downpipe 12 via an elbow pipe 51.

[0060] The elbow pipe 50 has a curved pipe 50A and socket portions 50B, 50B provided on both ends, and the elbow pipe 51 has a curved pipe 51A and socket portions 51B, 51B provided on both ends. In the elbow pipe 50, the inclination angle between the central axis of one socket portion 50B and the central axis of the other socket portion 50B is set to 90°. In the elbow pipe 51, the inclination angle between the central axis of one socket portion 51B and the central axis of the other socket portion 51B is set to 90°. The elbow pipes 50 and 51 are long elbow type elbow pipes in which the curved pipe portions 50A and 51A are slightly longer than those of the elbow pipes 10 and 11. In the piping structure shown in Figure 4, a downspout 34 is present and elbow pipes 10 and 11 that are compatible with long elbows are used, so the degree of stress concentration on the elbow pipes 10 and 11 and the drain member 8 can be reduced.

[0061] However, in the case of the piping structure shown in Figure 4, the gutter 7 cannot be connected unless it is spaced a distance equal to the length of the downspout 34 from the wall, which also results in a poorly fitted piping arrangement. In contrast, the piping structure shown in Figure 1 has the advantage of a good fit around the connection points between the drain member 8 and the elbow pipes 10 and 11. Furthermore, since the drain member 8 is reinforced by the vertical ribs 37, it is possible to create a structure that not only fits well but is also less prone to cracking of the drain member 8.

[0062] In a structure where a gutter 7 is provided on a corrugated metal roof 1, another possible piping structure is to attach the drain member 8 to the gutter 7 and connect the drain member 8 to the downpipe 12, as shown in Figure 5. In the piping structure shown in Figure 5, long elbow-type elbow pipes 50 and 51, which are connected in an S-shape to the socket portion 8A, are connected to the upper end of the downpipe 12 to the socket portion 51B of the elbow pipe 51.

[0063] In the piping structure shown in Figure 5, the lengths of the elbow pipes 50 and 51 are set to be larger than those of the elbow pipes 10 and 11 described earlier. Therefore, even if there is some movement of the eaves gutter 7 due to thermal expansion of the corrugated metal roof 1 or wind pressure, stress can be distributed. In this structure as well, by providing vertical ribs 37 on the upper drain member 16, it is possible to make the upper drain member 16 less prone to cracks. Furthermore, in the structure of Figure 5, stress can be distributed, making it less likely for cracks to occur in the elbow pipes 50 and 51. However, the configuration shown in Figure 5 has the problem that the horizontal length a of the piping structure from the drain member 8 to the downpipe 12 becomes longer due to the lengthening of the elbow pipes 50 and 51, resulting in a poor fit.

[0064] In a structure where a gutter 7 is provided on a corrugated metal roof 1, another possible piping structure is to attach the drain member 8 to the gutter 7 and connect the drain member 8 to the downpipe 12, as shown in Figure 6.

[0065] Figure 6 shows a piping structure in which the lower end of a drain member 8 attached to a gutter 7 is directly connected to an elbow pipe 10, a connecting pipe 52 made of a single pipe positioned diagonally is connected to the other end of the elbow pipe 10, and the other end of the connecting pipe 52 is connected to a downpipe 12 via an elbow pipe 11. In the piping structure shown in Figure 6, a downspout 52 is provided, so even if there is some movement of the eaves gutter 7 due to thermal expansion of the corrugated metal roof 1 or wind pressure during strong winds, it is expected that stress will be distributed, and the elbow pipes 10 and 11 will be less prone to cracking. In addition, by providing vertical ribs 37 on the upper drain member 16, the upper drain member 16 will be less prone to cracking. However, the configuration shown in Figure 6 has the problem that the horizontal length b of the piping structure from the drain member 8 to the downpipe 12 becomes longer due to the addition of the downpipe 52, resulting in an improper fit.

[0066] "Second Embodiment" Figure 7 is a cross-sectional view of a main part showing a drainage member according to a second embodiment of the present invention. In the second embodiment, the configuration in which the gutter 7 is supported by a gutter support 6 on the corrugated metal roof 1 is the same as the configuration in the first embodiment, and the configuration in which an upper drain member 16 and a lower drain member 15 are attached to the gutter 7 is also the same as the configuration in the first embodiment. Furthermore, the configuration in which the downpipe 12 is connected to the lower drain member 15 via elbow pipes 10 and 11 is also the same. The configuration of the second embodiment differs from that of the first embodiment in the configuration of the vertical ribs. As shown in Figure 7, multiple vertical ribs 46 are provided on the inside of the upper drain member 16, similar to the vertical ribs 37 mentioned earlier. The vertical ribs 46 are formed to extend from the upper surface of the upper flange portion 31 to a position slightly above the upper end of the area where the outer thread portion 35 is formed.

[0067] The vertical rib 46 has its upper end surface 46A flush with the upper surface of the upper flange portion 31, and its lower end surface 46B is positioned slightly above the upper end of the area where the outer peripheral thread portion 35 is formed. In other words, the vertical rib 46 has its lower end surface 46B positioned slightly above the front surface of the circumferential step portion 43A at the lower end of the outer cylinder reduced diameter portion 43. In the longitudinal rib 46, the width of the protrusion on the bottom side formed inside the inner cylinder portion 32 is almost constant. In contrast, since the upper surface of the upper flange portion 31 is curved, a wide extension portion 46D is formed on the upper side of the longitudinal rib 46 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 46A of the longitudinal rib 46, which corresponds to the upper surface of the extension portion 46D, is formed flush with the upper surface of the upper flange portion 31.

[0068] For example, the distance from the lower end surface 46B of the vertical rib 46 to the upper surface of the circumferential step portion 43A (a2 = height of the vertical rib 46) is formed to be approximately 5 mm or less. This distance is more preferably 3 mm or less, and may even be 0 mm. Note that a negative value for this distance indicates the structure of the first embodiment described above.

[0069] The drainage member of the second embodiment shown in Figure 7 can achieve the same effects as the drainage member of the first embodiment. The upper drain member 16 is reinforced with vertical ribs 46. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the eaves gutter 7 due to thermal expansion of the corrugated metal roof 1 or wind pressure during strong winds. Furthermore, when applied to the gutter piping structure shown in Figure 1, it is possible to provide a gutter piping structure that fits well.

[0070] Furthermore, in the drainage member of the second embodiment, the lower end surface 46B of the vertical rib 46 is positioned slightly above the upper end of the area where the outer peripheral thread portion 35 is formed. When the lower end of the vertical rib 46 is positioned above the formation area of ​​the outer circumference threaded portion 35, the upper drain member 16 is manufactured by molding, and the outer circumference threaded portion 35 is less likely to deform due to thermal shrinkage after molding. If the lower end of the vertical rib 46 overlaps with the formation area of ​​the outer circumference threaded portion 35 over a wide area, there is a risk that the outer circumference threaded portion 35 will deform due to thermal shrinkage after molding. If the outer circumference threaded portion 35 deforms, it may become difficult to fit it with the inner circumference threaded portion 44 of the lower drain member 15. Therefore, in the second embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together.

[0071] "Third Embodiment" Figure 8 is a cross-sectional view of a main part showing a drainage member according to a third embodiment of the present invention. In the third embodiment, the configuration in which the gutter 7 is supported by a gutter support 6 on the corrugated metal roof 1 is the same as the configuration in the first embodiment, and the configuration in which an upper drain member 16 and a lower drain member 15 are attached to the gutter 7 is also the same as the configuration in the first embodiment. Furthermore, the configuration in which the downpipe 12 is connected to the lower drain member 15 via elbow pipes 10 and 11 is also the same. The configuration of the third embodiment differs from that of the first embodiment in the configuration of the vertical ribs. As shown in Figure 8, multiple vertical ribs 47 are provided on the inside of the upper drain member 16, similar to the vertical ribs 37 mentioned earlier. The vertical rib 47 is formed to extend from the upper surface of the upper flange portion 31 to a position slightly above the upper end of the area where the outer thread portion 35 is formed.

[0072] The vertical rib 47 has its upper end surface 47A flush with the upper surface of the upper flange portion 31, and its lower end surface 47B is positioned slightly above the upper end of the area where the outer thread portion 35 is formed. In the longitudinal rib 47, an inclined surface 47E is formed at the lower end of the longitudinal rib 47 such that the width of the protrusion on the bottom side, which is formed inside the inner cylinder portion 32, gradually increases towards the upper end of the inner cylinder portion 32. Also, since the upper surface of the upper flange portion 31 is curved, a wide extension portion 47D is formed on the upper side of the longitudinal rib 47 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 47A of the longitudinal rib 47, which corresponds to the upper surface of the extension portion 47D, is formed flush with the upper surface of the upper flange portion 31. Furthermore, the thickness of the longitudinal rib 47 is tapered so that it becomes progressively thinner from its upper end to its lower end.

[0073] The drainage member of the third embodiment shown in Figure 8 can achieve the same effects as the drainage member of the second embodiment. The upper drain member 16 is reinforced with vertical ribs 47. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the eaves gutter 7 due to thermal expansion of the corrugated metal roof 1 or wind pressure during strong winds. When applied to the gutter piping structure shown in Figure 1, it is possible to provide a well-fitting gutter piping structure. Furthermore, since the lower end of the vertical rib 47 is positioned above the formation area of ​​the outer thread portion 35, an upper drain member 16 can be obtained in which the outer thread portion 35 is not deformed due to thermal shrinkage after molding. Therefore, in the third embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together.

[0074] Furthermore, the thickness of the vertical ribs 47 has been adjusted so that they gradually become thinner from the top to the bottom, which has the effect of improving drainage performance. The effect of improving drainage by gradually reducing the thickness of the vertical ribs from the top to the bottom can be similarly obtained with the vertical ribs 37 and 46 of the first and second embodiments. Therefore, the drainage can be further improved by adding a gradient to the thickness of the vertical ribs 37 and 46.

[0075] "Fourth Embodiment" Figure 9 is a cross-sectional view of a main part showing a drainage member according to a fourth embodiment of the present invention. The configuration of the fourth embodiment differs from that of the second embodiment shown in Figure 7 in the configuration of the vertical ribs. As shown in Figure 9, multiple vertical ribs 49 are provided on the inside of the upper drain member 16, similar to the vertical ribs 46 mentioned earlier. The vertical ribs 49 are formed to extend from the upper surface of the upper flange portion 31 to a position slightly above the upper end of the area where the outer thread portion 35 is formed.

[0076] The vertical rib 49 has its upper end surface 49A flush with the upper surface of the upper flange portion 31, and its lower end surface 49B is positioned slightly above the upper end of the area where the outer thread portion 35 is formed. In the vertical rib 49, a linear inclined portion 49E is formed at the lower end of the vertical rib 49 such that the width of the protrusion on the bottom side formed on the inside of the inner cylinder portion 32 gradually increases towards the upper end of the inner cylinder portion 32. In the vertical rib 49, an inner peripheral edge portion 49F is formed that extends from the upper end of the inner cylinder portion 32 to the inner circumference of the upper flange portion 31, extending the linear inclined portion 49E to near the pipe axis O1 (towards the center). Furthermore, since the upper surface of the upper flange portion 31 is curved, a wide extension portion 49D is formed on the upper side of the vertical rib 47 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 49A of the vertical rib 49, which corresponds to the upper surface of the extension portion 49D, is formed flush with the upper surface of the upper flange portion 31.

[0077] The drain member of the fourth embodiment shown in Figure 9 can achieve the same effects as the drain member of the second embodiment. The upper drain member 16 is reinforced by the vertical ribs 49. Furthermore, the vertical ribs 49 have an inner peripheral edge portion 49F, making the area of ​​the vertical ribs larger than in the first embodiment, thus providing a greater reinforcing effect. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the gutter 7 due to thermal expansion of the corrugated metal roof 1 and wind pressure during strong winds. When applied to the gutter piping structure shown in Figure 1, it is possible to provide a gutter piping structure that fits well.

[0078] Since the lower end of the vertical rib 49 is positioned above the formation area of ​​the outer thread portion 35, an upper drain member 16 can be obtained in which the outer thread portion 35 is not deformed due to thermal shrinkage after molding. Therefore, in the fourth embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together. Furthermore, although the vertical ribs 49 are enlarged by providing the inner peripheral edge portion 49F, the reduction in the opening of the outlet portion 22 is suppressed by providing the linear inclined portion 49E, thereby suppressing a decrease in drainage performance.

[0079] "Fifth Embodiment" Figure 10 is a cross-sectional view of a main part showing a drainage member according to a fifth embodiment of the present invention. The configuration of the fifth embodiment differs from that of the fourth embodiment shown in Figure 9 in the configuration of the vertical ribs. As shown in Figure 10, multiple vertical ribs 55 are provided on the inside of the upper drain member 16, similar to the vertical ribs 49 mentioned earlier. The vertical ribs 55 are formed to extend from the upper surface of the upper flange portion 31 to a position slightly above the upper end of the area where the outer thread portion 35 is formed.

[0080] The vertical rib 55 has its upper end surface 55A flush with the upper surface of the upper flange portion 31, and its lower end surface 55B is positioned slightly above the upper end of the area where the outer thread portion 35 is formed. In the vertical rib 55, a concave curved inclined portion 55E is formed at the lower end of the vertical rib 49 such that the width of the protrusion on the bottom side formed on the inside of the inner cylinder portion 32 gradually increases towards the upper end of the inner cylinder portion 32. In the vertical rib 55, an inner peripheral edge portion 55F is formed that extends from the upper end of the inner cylinder portion 32 to the inner circumference of the upper flange portion 31, extending the curved inclined portion 55E to near the pipe axis O1 (towards the center). Furthermore, since the upper surface of the upper flange portion 31 is curved, a wide extension portion 55D is formed on the upper side of the vertical rib 55 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 55A of the vertical rib 55, which corresponds to the upper surface of the extension portion 55D, is formed flush with the upper surface of the upper flange portion 31.

[0081] The drain member of the fifth embodiment shown in Figure 10 can obtain the same effects as the drain member of the fourth embodiment. The upper drain member 16 is reinforced by the vertical ribs 55. Furthermore, since the vertical ribs 55 are provided with curved inclined portions 55E, the area of ​​the vertical ribs is larger than in the first embodiment, a greater reinforcing effect can be obtained. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the gutter 7 due to thermal expansion of the corrugated metal roof 1 and wind pressure during strong winds. When applied to the gutter piping structure shown in Figure 1, it is possible to provide a gutter piping structure that fits well.

[0082] Since the lower end of the vertical rib 55 is positioned above the formation area of ​​the outer thread portion 35, an upper drain member 16 can be obtained in which the outer thread portion 35 is not deformed due to thermal shrinkage after molding. Therefore, in the fifth embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together. Furthermore, although the extension portion 55D is provided to enlarge the vertical rib 55, the provision of the curved inclined portion 55E prevents the opening of the drain outlet portion 22 from becoming smaller, thereby preventing a decrease in drainage performance.

[0083] "Sixth Embodiment" Figure 11 is a cross-sectional view of a main part showing a drainage member according to the sixth embodiment of the present invention. The configuration of the sixth embodiment differs from that of the fourth embodiment shown in Figure 9 in the configuration of the vertical ribs. As shown in Figure 11, multiple vertical ribs 56 are provided on the inside of the upper drain member 16 (four around the inner circumference). The vertical ribs 56 are formed to extend from the upper surface of the upper flange portion 31 to a position slightly above the upper end of the area where the outer thread portion 35 is formed.

[0084] The vertical rib 56 has its upper end surface 56A flush with the upper surface of the upper flange portion 31, and its lower end surface 56B is positioned slightly above the upper end of the area where the outer thread portion 35 is formed. In the longitudinal rib 56, the width of the protrusion on the bottom side formed inside the inner cylinder portion 32 is constant toward the upper end of the inner cylinder portion 32, and the inner end of the longitudinal rib 56 protrudes close to the pipe axis O1 (towards the central axis). Since the upper surface of the upper flange portion 31 is curved, a wide extension portion 56D is formed on the upper side of the vertical rib 56 located on the upper surface side of the upper flange portion 31, extending radially outward along the upper surface of the upper flange portion 31. The upper end surface 56A of the vertical rib 55, which corresponds to the upper surface of the extension portion 56D, is formed flush with the upper surface of the upper flange portion 31. An inner end surface 56E parallel to the pipe axis O1 is formed at the inner end of the vertical rib 56 closest to the pipe axis of the upper drain member 16.

[0085] The drain member of the sixth embodiment shown in Figure 11 can achieve the same effects as the drain member of the fourth embodiment. The upper drain member 16 is reinforced by the vertical ribs 56. Furthermore, the vertical ribs 56 are extended closer to the pipe axis O1, and the area of ​​the vertical ribs is larger than in the first embodiment, thus providing a greater reinforcing effect. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the gutter 7 due to thermal expansion of the corrugated metal roof 1 and wind pressure during strong winds. When applied to the gutter piping structure shown in Figure 1, it is possible to provide a gutter piping structure that fits well.

[0086] Since the lower end of the vertical rib 56 is positioned above the formation area of ​​the outer thread portion 35, an upper drain member 16 can be obtained in which the outer thread portion 35 is not deformed due to thermal shrinkage after molding. Therefore, in the sixth embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together.

[0087] "Seventh Embodiment" By the way, in the present invention, the configuration of the siphon section is not particularly limited. Figure 12 shows a siphon section 62 in which a funnel-shaped inlet 60 that widens upward is provided on the upper inner side of the lower drain member 15 which has vertical ribs 48, and this inlet 60 is suspended and supported above the upper flange section 31 by a plurality of support ribs 61. Such a funnel-shaped inlet 60 has the same effect as the lid member 18 in the above-described embodiment, by making it difficult for air to be drawn in and distributing stress to each longitudinal rib 19 (support rib 61). The siphon section can also employ the configuration shown in Figure 12, and these configurations can be used to exert a siphon effect and add a high drainage function to the piping structure.

[0088] In the configuration shown in Figure 12, the longitudinal rib 48 has its upper end surface 48A flush with the upper surface of the upper flange portion 31, and its lower end surface 48B positioned slightly above the upper end of the area where the outer peripheral thread portion 35 is formed. An inclined surface 48E is formed at the lower end of the longitudinal rib 48 such that the width of the protrusion on the bottom side formed inside the inner cylinder portion 32 gradually increases towards the upper end of the inner cylinder portion 32.

[0089] The drain member of the seventh embodiment shown in Figure 12 can achieve the same effects as the drain member of the third embodiment. The upper drain member 16 is reinforced with vertical ribs 48. Therefore, it has the characteristic that it is less likely to cause cracks or other damage to the upper drain member 16 due to stress concentration caused by some movement of the eaves gutter 7 due to thermal expansion of the corrugated metal roof 1 or wind pressure during strong winds. Furthermore, when applied to the gutter piping structure shown in Figure 1, it is possible to provide a gutter piping structure that fits well. Furthermore, since the lower end of the vertical rib 48 is positioned above the formation area of ​​the outer peripheral thread portion 35, an upper drain member 16 can be obtained in which the outer peripheral thread portion 35 is not deformed due to thermal shrinkage after molding. Therefore, in the sixth embodiment, a lower drain member 15 and an upper drain member 16 can be provided that can be reliably fitted together.

[0090] "Other Embodiments" For example, the lid member 18 may be omitted, as shown in the upper drain member 16 of the first modified example in Figure 13 and the second modified example in Figure 14. In this case, the upper drain member 16 may be provided with a cylindrical or solid vertical rib connecting member 64 near its center (in the illustrated example, the vertical rib connecting member 64 is cylindrical). Alternatively, multiple vertical ribs 19 may be directly connected to each other (without the vertical rib connecting member 64) near the central axis of the upper drain member 16. For example, a part or the entire surface of one vertical rib's side facing the central axis may be integrated with a part or the entire surface of another vertical rib's side facing the central axis. Furthermore, multiple vertical ribs 19 may be connected at their upper ends by an annular ring. For example, the upper end surfaces of multiple vertical ribs may be integrated with the lower surface of an annular ring having an opening in the center. This provides the same effect as the lid member 18 in the above-described embodiment, by distributing the stress to each longitudinal rib 19.

[0091] Furthermore, as shown in Figures 15 and 16, an expansion joint 70 equipped with a rubber ring inside and a receiving opening that allows the inserted pipe or fitting to slide may be provided between the drain member 8 and the elbow pipe 10 (Figure 15), or at the bottom of the elbow pipe 11 (Figure 16). As a result, even if the drain member 8 and elbow pipes 10 and 11 move relative to each other due to the expansion and contraction of the corrugated metal roof 1, the pipe and socket at the bottom of the drain member 8, or the pipe and socket at the bottom of the elbow pipe 11, which are inserted into the expansion joint 70, slide within the socket of the expansion joint 70, thereby relieving the stress on the elbow pipes 10 and 11 and the drain member 8.

[0092] The vertical ribs provided on the drain member in the previous embodiment may be provided in other positions, as shown in the following modified example. Figure 17 shows a third modified example of a drain member applicable to the drainage member according to the present invention, and shows an upper drain member 126 that can be applied in place of the upper drain member 16 shown based on Figure 3 in the first embodiment. The upper drain member 126 has an upper flange portion 31, an inner cylinder portion 32, an inner cylinder reduced diameter portion 33, and an outer threaded portion 35, which are equivalent to the upper flange portion 31 provided on the upper drain member 16 of the first embodiment. The inner cylinder portion 32 is inserted into and integrated with the outer cylinder portion 42 of the lower drain member 15, similar to the first embodiment.

[0093] Two longitudinal ribs 127 are integrated into the upper surface of the upper flange portion 31. When the inner cylinder portion 32 and the upper flange portion 31 are viewed from above, these two longitudinal ribs 127 are formed to be parallel to each other and spaced apart from each other with respect to the center of the inner cylinder portion 32. The two longitudinal ribs 127 may also be formed at positions off-center from the center of the inner cylinder portion 32.

[0094] Figure 18 shows a fourth modified example of a drain member applicable to the drainage member according to the present invention, and shows an upper drain member 136 that can be applied in place of the upper drain member 16 shown based on Figure 3 in the first embodiment. The upper drain member 136 has an upper flange portion 31, an inner cylinder portion 32, an inner cylinder reduced diameter portion 33, and an outer threaded portion 35, which are equivalent to the upper flange portion 31 provided on the upper drain member 16 of the first embodiment. The inner cylinder portion 32 is inserted into and integrated with the outer cylinder portion 42 of the lower drain member 15, similar to the first embodiment.

[0095] On the upper surface of the upper flange portion 31, a vertical rib structure 138 is integrated, which consists of four vertical ribs 137 that are integrated in a grid-like pattern when viewed from above. When the inner cylinder portion 32 and the upper flange portion 31 are viewed from above, these four vertical ribs 137 are formed at positions that surround the center of the inner cylinder portion 32. The four vertical ribs 137 may also be formed at positions that are off-center from the center of the inner cylinder portion 32. As shown in Figures 17 and 18, the vertical ribs 127 and 137 provided on the upper flange portion 31 can take on various shapes, but the plan view shape illustrated in Figure 19 can also be adopted.

[0096] Figure 19(A) shows a fifth modified example of a drain member applicable to the drain member according to the present invention. In this modified example, two curved plates 147, which are hyperbolic in plan view, are arranged on the upper flange portion 31 so as to form an X shape in plan view, and the intersection point e of the two curved plates 147 is located at the center of the inner cylinder portion 32. The curved plates 147 are arranged in an X shape in plan view to form a vertical rib 148. Each of the two curved plates 147 is integrated with the upper flange portion 31 so as to be erected from the upper surface of the upper flange portion 31 and the upper surface of the inner cylinder diameter reduction portion 33. The upper flange portion 31 with the vertical ribs 148 as shown in Figure 19(A) can be applied to any of the above embodiments.

[0097] Figure 19(B) shows a sixth modified example of a drain member applicable to the drain member according to the present invention. This modified example is an example in which two curved plates 149, which are curved in a hyperbolic shape in plan view, are placed on the upper flange portion 31. The two curved plates 149 are positioned with their central portion f in the width direction in plan view (the position where the curvature of the curved plates is greatest) facing toward the center of the inner cylinder portion 32, and their concave side facing radially outward from the inner cylinder portion 32. The curved plates 149, 149 are formed in symmetrical positions on either side of the center of the inner cylinder portion 32 in plan view, and are integrated with the upper flange portion 31 and the upper surface of the inner cylinder diameter reduction portion 33 so as to rise from these. In this example, a longitudinal rib 150 is formed from the two curved plates 149. An upper flange portion 31 with vertical ribs 150 as shown in Figure 19(B) can be applied to any of the above embodiments. As shown in Figures 19(A) and (B), the longitudinal ribs 148 and 150 may be formed to pass through the center of the inner cylindrical portion 32 when viewed from above, or they may not be formed to pass through it.

[0098] Figure 19(C) shows a seventh modified example of a drain member applicable to the drain member according to the present invention. In this modified example, three flat vertical ribs 151 are integrated with the upper flange portion 31 and the inner cylinder reduced diameter portion 33 so as to be erected from the upper surface of the upper flange portion 31 and the upper surface of the inner cylinder reduced diameter portion 33. When each longitudinal rib 151 is viewed from above, one end 151a of each longitudinal rib is positioned at the circumferential position of the upper flange portion 31. As shown in Figure 19(C), the one end 151a of each longitudinal rib 151 is positioned at 120° intervals in the circumferential direction of the circle drawn by the upper flange portion 31. Each longitudinal rib 151 extends inward from the position where its one end 151a is positioned, towards the inner cylinder portion 32. The other end 151b of the longitudinal rib 151 is positioned slightly offset from the center of the inner cylinder portion 32. In the case of the three longitudinal ribs 151, the positions where the three ends 151b are positioned are the vertices of an equilateral triangle drawn by a dashed line in Figure 19(C), with the center position O32 of the inner cylinder portion 32 as the center position. As shown in Figure 19(C), when viewed from above, the longitudinal ribs 151 may be provided at positions offset from the radial position of the inner cylinder portion 32. An upper flange portion 31 with vertical ribs 151 as shown in Figure 19(C) can be applied to any of the above embodiments.

[0099] Figure 19(D) shows an eighth modified example of a drain member applicable to the drain member according to the present invention. In this modified example, four flat vertical ribs 152 are integrated with the upper flange portion 31 and the inner cylinder reduced diameter portion 33 so as to be erected from the upper surface of the upper flange portion 31 and the upper surface of the inner cylinder reduced diameter portion 33. When each longitudinal rib 152 is viewed from above, one end 152a of each longitudinal rib is positioned at the circumferential position of the upper flange portion 31. As shown in Figure 19(D), the one end 152a of each longitudinal rib 152 is positioned at 90° intervals in the circumferential direction of the circle drawn by the upper flange portion 31. Each longitudinal rib 152 extends inward from the position where its one end 152a is positioned, towards the inner cylinder portion 32. The other end 152b of the longitudinal rib 152 is positioned slightly offset from the center of the inner cylinder portion 32. In the case of the four longitudinal ribs 152, the positions where the four ends 152b are positioned are the vertex positions of the square drawn by the dashed line in Figure 19(D), with the center position O32 of the inner cylinder portion 32 as the center position. As shown in Figure 19(D), when viewed from above, the longitudinal ribs 152 may be provided at positions offset from the radial position of the inner cylinder portion 32. The upper flange portion 31 with the vertical ribs 152 as shown in Figure 19(D) can be applied to any of the above embodiments.

[0100] Figure 19(E) shows a ninth modified example of a drain member applicable to the drain member according to the present invention. In this modified example, five flat vertical ribs 153 are integrated with the upper flange portion 31 and the inner cylinder reduced diameter portion 33 so as to be erected from the upper surface of the upper flange portion 31 and the upper surface of the inner cylinder reduced diameter portion 33. When each longitudinal rib 153 is viewed from above, one end 153a of each longitudinal rib is positioned at the circumferential position of the upper flange portion 31. As shown in Figure 19(E), the one end 153a of each longitudinal rib 153 is positioned at 72° intervals in the circumferential direction of the circle drawn by the upper flange portion 31. Each longitudinal rib 153 extends inward from the position where its one end 153a is positioned towards the inner cylinder portion 32. The other end 153b of the longitudinal rib 153 is positioned slightly offset from the center of the inner cylinder portion 32. For the five longitudinal ribs 153, the positions where the five ends 153b are positioned are the vertex positions of a regular pentagon drawn by a dashed line in Figure 19(E), with the center position O32 of the inner cylinder portion 32 as the center position. The upper flange portion 31 with the vertical ribs 153 as shown in Figure 19(E) can be applied to any of the embodiments described above. As explained above, the shape of the vertical ribs can be of various types. [Explanation of Symbols]

[0101] 1...folded plate roof, 7...eaves gutter, 7A...bottom plate, 7B...side plate, 7H...through hole, 8...Drain component (siphon drain component), 10, 11...Elbow pipe, 12...Downpipe, 15...Lower drain member, 16...Upper drain member, 17...Siphon section, 22...Outlet section, 31...Upper flange section, 32...Inner cylinder section, 33...Inner cylinder reduced diameter section, 35...Outer circumference threaded section, 37...Vertical rib, 41...Lower flange section, 41H...Inlet, 42...Outer cylinder section, 43... Outer cylinder reduced diameter section, 43A... Circumferential step section, 44... Inner circumference threaded section, 46... Vertical rib, 47... Longitudinal rib, 48... Longitudinal rib, 49... Longitudinal rib, 49E... Straight inclined section, 49F...Inner peripheral edge, 55...Longitudinal rib, 55E...Curved inclined section, 55F...Inner peripheral edge, 56... Vertical ribs.

Claims

1. A drain member is attached to a gutter having a bottom plate with a through hole and side plates extending upward from both ends in the width direction of the bottom plate, and is connected to a downpipe via an elbow pipe, 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 circumference, and an outer cylindrical portion formed below the lower flange portion, The upper drain member comprises an upper flange portion disposed on the upper surface of the bottom plate and having a drain opening formed on its inner circumference, and an inner cylinder portion formed below the upper flange portion and inserted into the outer cylinder portion, At the connection portion between the upper flange portion and the inner cylinder portion, an inner cylinder diameter reduction portion is provided, where the inner diameter decreases as you move from the upper flange portion toward the inner cylinder portion. Multiple vertical ribs are provided on the upper drain member, extending from the upper flange portion to the lower end of the inner cylinder diameter reduction portion, spaced apart in the inner circumferential direction of the inner cylinder portion. A drainage member characterized in that the lower end of the vertical rib is positioned below the lower end of the inner cylinder diameter reduction portion.

2. The connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion in which the inner diameter decreases as it moves from the lower flange portion toward the outer cylinder portion. The lower end of the vertical rib is positioned below the lower end of the reduced diameter portion of the outer cylinder. The drainage member according to claim 1.

3. The connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion in which the inner diameter decreases as it moves from the lower flange portion toward the outer cylinder portion. The inner surface of the outer cylinder portion has an inner circumferential threaded portion, and the outer surface of the inner cylinder portion has an outer circumferential threaded portion, The lower end of the vertical rib is positioned below the lower end of the reduced diameter portion of the inner cylinder and above the upper end of the inner circumferential thread portion of the outer cylinder. The drainage member according to claim 1.

4. The thickness of the vertical ribs gradually decreases from the upper end to the lower end. A drainage member according to any one of claims 1 to 3.

5. The longitudinal rib has an inner peripheral edge that extends to the center of the inner cylindrical portion on the inner circumferential side of the inner cylindrical portion. A drainage member according to any one of claims 1 to 3.

6. The longitudinal rib has a linear or curved inclined portion that extends to the center of the inner cylinder portion. A drainage member according to any one of claims 1 to 3.

7. A drain member is attached to a gutter having a bottom plate with a through hole and side plates extending upward from both ends in the width direction of the bottom plate, and the drain member is connected to a downpipe via an elbow pipe, The drain member is 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 circumference, and an outer cylindrical portion formed below the lower flange portion, The upper drain member has an upper flange portion disposed on the upper surface of the bottom plate and having a drain opening formed on its inner circumference, and an inner cylinder portion formed below the upper flange portion and inserted into the outer cylinder portion, At the connection portion between the upper flange portion and the inner cylinder portion, an inner cylinder diameter reduction portion is provided, where the inner diameter decreases as you move from the upper flange portion toward the inner cylinder portion. Multiple vertical ribs are provided on the upper drain member, extending from the upper flange portion to the lower end of the inner cylinder diameter reduction portion, spaced apart in the inner circumferential direction of the inner cylinder portion. A piping structure characterized in that the lower end of the vertical rib is positioned below the lower end of the inner cylinder diameter reduction portion.

8. The connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion in which the inner diameter decreases as it moves from the lower flange portion toward the outer cylinder portion. The lower end of the vertical rib is positioned below the lower end of the reduced diameter portion of the outer cylinder. The piping structure according to claim 7.

9. The connection portion between the lower flange portion and the outer cylinder portion has an outer cylinder diameter reduction portion in which the inner diameter decreases as it moves from the lower flange portion toward the outer cylinder portion. The inner surface of the outer cylinder portion has an inner circumferential threaded portion, and the outer surface of the inner cylinder portion has an outer circumferential threaded portion, The lower end of the vertical rib is positioned below the lower end of the reduced diameter portion of the inner cylinder and above the upper end of the inner circumferential thread portion of the outer cylinder. The piping structure according to claim 7.

10. The thickness of the vertical ribs gradually decreases from the upper end to the lower end. The piping structure according to claim 7.

11. The longitudinal rib has an inner peripheral edge that extends to the center of the inner cylindrical portion on the inner circumferential side of the inner cylindrical portion. The piping structure according to claim 7.

12. The longitudinal rib has a linear or curved inclined portion that extends to the center of the inner cylinder portion. The piping structure according to claim 7.

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