Drain member, eaves gutter, rain gutter, and building, and method for attaching drain member

Abstract

To provide a drain member capable of smoothly inserting an inner cylinder of an upper drain member into an outer cylinder of a lower drain member, a siphon drain member, and a piping structure.SOLUTION: A siphon drain member 100 to be attached to a bottom plate of an eaves gutter, includes: an upper drain member 120 that has an upper flange 121 placed on the bottom plate, an upper inner cylinder 122 formed below the flange 121, and an inner cylinder diameter reduction part 123 that connects the upper flange 121 and the inner cylinder 122; and a lower drain member 110 that has a lower flange 111 placed on the lower surface of the bottom plate, an outer cylinder 112 formed below the lower flange 111, an outer cylinder diameter reduction portion 113 that connects the lower flange 111 and the outer cylinder 112, and an insertion guide 113G for aligning tube axes O1 and O2 with each other.SELECTED DRAWING: Figure 6B

Description

Technical Field

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

Background Art

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

[0003] Such a siphon drain member generally includes a drain member including a lower drain member disposed on the lower surface across the bottom plate of the eaves gutter and an upper drain member disposed on the upper surface and having a siphon portion formed at the upper part. A drain member including such a lower drain member and an upper drain member is applied to various uses, not limited to siphon drain members.

[0004] As shown in FIG. 16A, the drain member 900 includes, for example, a lower drain member 910 disposed on the lower surface of a bottom plate (eaves gutter) 11(10) and an upper drain member 920 disposed above the eaves gutter 10. Further, in the siphon drain member, as shown in FIG. 16B, for example, it has a structure including a siphon portion 950 disposed at the upper part of the upper drain member 920.

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

[0006] Further, the upper drain member 920 has, for example, an upper flange portion 921 formed with a drain port portion on the inner peripheral side, an inner cylinder portion 922 formed below the upper flange portion 921, and an inner cylinder diameter-reducing portion 923 connecting the upper flange portion 921 and the inner cylinder portion 922. An outer peripheral thread portion 925 is formed on the outer peripheral surface of the inner cylinder portion 922.

[0007] The lower drain member 910 is disposed on the lower surface of the bottom plate 11 of the eaves gutter 10, and the upper drain member 920 is disposed on the upper surface of the bottom plate 11 of the eaves gutter. The inner cylinder portion 922 is inserted into the outer cylinder portion 912 through the lower hole 11H, and the pipe axis O1 of the lower drain member 910 and the pipe axis O2 of the upper drain member 920 are arranged to be substantially coaxial. The inner peripheral thread portion 915 and the outer peripheral thread portion 925 are screwed together to form the drain member 900 as a combination.

[0008] Further, a step portion 914 is formed at the lower part of the outer cylinder diameter-reducing portion 913 of the lower drain member 910, and the lower surface 914A of the step portion 914 abuts against the upper end surface of the receiving portion of an elbow (not shown) connected to the downstream side, so as to set the mutual distance of the drain members 900 to a predetermined dimension.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] However, when the inner cylinder portion 922 is inserted into the outer cylinder portion 912 to combine the lower drain member 910 and the upper drain member 920, as shown in FIG. 16B, the lower end portion 922T of the inner cylinder portion 922 may be caught by the upper surface 914B of the step portion 914. In this way, when the lower end portion 922T of the inner cylinder portion 922 is caught by the upper surface 914B of the step portion 914, it becomes difficult to smoothly insert the inner cylinder portion 922 into the outer cylinder portion 912 and efficiently arrange it at a predetermined position.

[0011] Further, as shown in FIG. 16B, there may be a case where gaps are formed at intervals in the circumferential direction in the inner circumferential thread portion 915 formed on the inner circumferential surface of the outer cylinder portion 912. Therefore, when the inner cylinder portion 922 is inserted into the outer cylinder portion 912 and the lower drain member 910 and the upper drain member 920 are combined, the outer circumferential thread portion 925 may enter the gap formed in the inner circumferential thread portion 915, and the inner circumferential thread portion 915 and the outer circumferential thread portion 925 may be fitted in a state where the pipe axis O1 and the pipe axis O2 are inclined. When the inner circumferential thread portion 915 and the outer circumferential thread portion 925 are fitted in a state where the pipe axis O1 and the pipe axis O2 are inclined, the pipe axes O1 and O2 of the lower drain member 910 and the upper drain member 920 are not arranged coaxially, and the upper drain member 920 is inclined and fitted with respect to the lower drain member 910, and a predetermined siphon action may not be generated, or there may be a gap between the upper drain and the eaves gutter bottom surface, resulting in water leakage. Therefore, a drain member that can smoothly insert the inner cylinder portion of the upper drain member into the outer cylinder portion of the lower drain member and efficiently arrange it at a predetermined position is desired.

[0012] The present invention has been made in consideration of such circumstances, and an object thereof is to provide a drain member, a siphon drain member, and a piping structure capable of smoothly inserting the inner cylinder portion of the upper drain member into the outer cylinder portion of the lower drain member.

Means for Solving the Problems

[0013] In order to solve the above problems, the present invention proposes the following means. (1) The first aspect of this invention is a drain member that is attached to an eaves gutter having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, and having a lower hole formed in the bottom plate. The drain member includes a lower flange portion disposed on the lower surface of the bottom plate and having an inlet formed on its inner circumference, an outer cylinder portion formed below the lower flange portion and extending downward, an outer cylinder diameter-reducing portion connecting the upper end portions of the lower flange portion and the outer cylinder portion and having a reduced diameter downward, and an inner circumferential screw portion formed on the inner circumferential surface of the outer cylinder portion. The drain member further includes an upper flange portion disposed on the upper surface of the bottom plate and having a drop port formed on its inner circumferential side, an inner cylinder portion formed below the upper flange portion and extending downward and inserted into the outer cylinder portion, an inner cylinder diameter-reducing portion connecting the upper end portions of the upper flange portion and the inner cylinder portion and having a reduced diameter downward, and an outer circumferential screw portion formed on the outer circumferential surface of the inner cylinder portion and screwed with the inner circumferential screw portion. At least one of the upper drain member and the lower drain member is provided with an insertion guide portion for guiding the inner cylinder portion toward the inner circumferential side of the outer cylinder portion when the upper drain member and the lower drain member are attached.

[0014] According to the drain member of this invention, since at least one of the upper drain member and the upper drain member is provided with an insertion guide portion, when the upper drain member and the lower drain member are attached, the inner cylinder portion is guided toward the inner circumferential side of the outer cylinder portion. As a result, the inner cylinder portion of the upper drain member can be smoothly inserted into the outer cylinder portion of the lower drain member.

[0015] (2) In the drain member according to the above (1), the insertion guide portion may be formed on the inner circumferential surface of the outer cylinder diameter-reducing portion and constituted by a continuously reduced-diameter inner circumferential surface that is continuously reduced in diameter to the inner circumferential surface of the outer cylinder portion.

[0016] According to the drain member of this invention, since the insertion guide portion is formed on the inner circumferential surface of the outer cylinder diameter-reducing portion and constituted by a continuously reduced-diameter inner circumferential surface that is continuously reduced in diameter to the inner circumferential surface of the outer cylinder portion, the inner cylinder portion of the upper drain member is guided inward of the outer cylinder portion without being caught by the outer cylinder diameter-reducing portion. As a result, the inner cylinder part can be efficiently and stably guided toward the inside of the outer cylinder part.

[0017] Here, the "continuously reduced-diameter inner peripheral surface formed on the inner peripheral surface of the outer cylinder reduced-diameter part and continuously reduced in diameter to the inner peripheral surface of the outer cylinder part" means that in a cross-section including the tube axis, the inner peripheral surface of the outer cylinder reduced-diameter part is smoothly formed by a straight line, a curve, or a combination of a straight line and a curve up to the upper end of the outer cylinder part. That is, it means that there are no steps or bulges that cause catches on the inner peripheral surface of the outer cylinder reduced-diameter part. In other words, when at least the inner peripheral surface of the outer cylinder reduced-diameter part is reduced in diameter, it is desirable that there is always a change in the position in the tube axis direction. Note that a bulge that does not cause a catch in the middle is also allowed.

[0018] (3) The drain member according to the above (1) or (2) may be configured such that the insertion guide part is a guide sleeve extending downward from the lower end part of the outer peripheral screw part.

[0019] According to the drain member of the present invention, since the insertion guide part is configured by a guide sleeve extending downward from the lower end part of the outer peripheral screw part, contact with the inner peripheral surface of the outer cylinder reduced-diameter part is suppressed. As a result, the inner cylinder part can be efficiently and stably guided toward the inside of the outer cylinder part.

[0020] Here, the "lower end part of the outer peripheral screw part" refers to the position where the height of the outer peripheral screw part becomes zero. In addition, the "guide sleeve whose outer peripheral surface on the lower side is of the same diameter as or reduced in diameter compared to the outer peripheral surface on the upper side" means, for example, that it is formed in a straight cylindrical shape of the same diameter from the upper end to the lower end of the guide sleeve, that it is formed in a tapered shape where the lower side is reduced in diameter compared to the upper side, that it is formed in a shape combining a straight shape and a tapered shape, and that there is no flat part (step part, protruding part) facing downward due to the diameter increasing toward the outer peripheral side from the upper side between the upper end and the lower end of the guide sleeve. Note that a mound-shaped bulge that does not hinder insertion is allowed.

[0021] (4) The drain member described in (3) above may be set such that the length of the guide sleeve in the pipe axis direction is longer than the length of the outer cylinder diameter-reduced portion of the lower drain member in the pipe axis direction.

[0022] According to the drain member of the present invention, since the length of the guide sleeve in the pipe axis direction is set to be longer than the length of the outer cylinder diameter-reduced portion of the lower drain member in the pipe axis direction, the outer peripheral surface of the inner cylinder portion can be inserted into the outer cylinder portion without contacting the inner peripheral surface of the outer cylinder portion.

[0023] (5) The drain member described in (3) or (4) above may be set such that the length of the guide sleeve in the pipe axis direction is shorter than the length of the outer cylinder portion of the lower drain member in the pipe axis direction.

[0024] According to the drain member of the present invention, since the length of the guide sleeve in the pipe axis direction is set to be shorter than the length of the outer cylinder portion of the lower drain member in the pipe axis direction, it is possible to suppress the guide sleeve from being exposed downward from the outer cylinder portion. As a result, when the upper drain member is inserted into the lower drain member to form the drain member, it is possible to prevent the inner cylinder portion from contacting the downstream joint or the like.

[0025] (6) In the drain member described in (5) above, a recess that is recessed upward from the lower end is formed in the outer cylinder portion of the lower drain member, and the lower end portion of the guide sleeve may be located above the upper bottom surface of the recess.

[0026] According to the drain member of the present invention, a recess (for example, a recess for attaching a tool) that is recessed upward from the lower end is formed in the outer cylinder portion of the lower drain member, and the lower end portion of the guide sleeve is located above the upper bottom surface of the recess, so that the guide sleeve (inner cylinder portion) does not overlap with the recess. As a result, when inserting a construction tool into this recess to assemble the lower drain member and the upper drain member, the construction tool abuts against the lower end surface of the guide sleeve, and there is no obstacle to the construction, and the drain member can be efficiently attached.

[0027] (7) The drain member according to any one of (1) to (6) above, wherein the upper drain member is arranged over the entire circumference at a position corresponding to the peripheral edge of the lower hole on the lower surface of the upper flange portion, and is formed by bending at the boundary between the flat surface on the outer peripheral side and the protruding surface protruding downward on the inner peripheral side. It may be provided with a linear bending recess.

[0028] According to the drain member of the present invention, the upper drain member is arranged over the entire circumference at a position corresponding to the peripheral edge of the lower hole (of the eaves gutter) on the lower surface of the upper flange portion, and is formed by bending at the boundary between the flat surface on the outer peripheral side and the protruding surface protruding downward on the inner peripheral side. Since it has a linear bending recess, a positioning step portion that is inserted into the inner peripheral surface (inner peripheral wall surface) of the lower hole and positioned with reference to the inner peripheral surface (inner peripheral wall surface) is not required, so the positioning step portion or the like does not directly contact the inner peripheral surface of the lower hole. Therefore, it is possible to suppress the adhesive applied to the lower surface of the upper flange from dripping into the lower hole or onto the inner peripheral surface of the lower hole or the lower surface of the bottom plate through the lower hole. As a result, the drain member can be positioned with high quality and stability with respect to the lower hole.

[0029] Here, the "position corresponding to the peripheral edge of the lower hole" is preferably the same position as the upper corner portion of the lower hole, but in the vicinity of the peripheral edge of the lower hole, the flat surface on the outer peripheral side is stably arranged on the upper surface of the bottom plate with an adhesive or the like sandwiched therebetween. It may be set as the position which is done.

[0030] In addition, the "linear bending recess formed by bending at the boundary" refers to a recess that opens at an angle greater than 90° on the lower side of the intersection angle between the flat surface and the protruding surface (when the protruding surface is a curve, it is the tangential direction at the boundary) at the boundary between the flat surface and the protruding surface. It should be noted that the intersection angle on the lower side is preferably 120° or more, and more preferably 150° or more. Also, in order to stably catch on the upper corner of the pilot hole, for example, the intersection angle is preferably 160° or less.

[0031] (8) The drain member according to any one of (1) to (7) above may have the upper drain member formed on the outer peripheral surface of the inner cylinder diameter-reducing portion and having a continuously diameter-reduced outer peripheral surface that is continuously diameter-reduced to the outer peripheral surface of the inner cylinder portion.

[0032] According to the drain member of the present invention, since the upper drain member is formed on the outer peripheral surface of the inner cylinder diameter-reducing portion and has a continuously diameter-reduced outer peripheral surface that is continuously diameter-reduced to the outer peripheral surface of the inner cylinder portion, it is possible to suppress the inner cylinder diameter-reducing portion of the upper drain member from being caught on the inner peripheral surface of the receiving port formed on the inner peripheral side of the lower flange portion or the inner peripheral surface of the outer cylinder diameter-reducing portion. As a result, the inner cylinder portion can be efficiently and stably guided inward of the outer cylinder portion.

[0033] Here, the "continuously diameter-reduced outer peripheral surface formed on the outer peripheral surface of the inner cylinder diameter-reducing portion and continuously diameter-reduced to the outer peripheral surface of the inner cylinder portion" means that in a cross-section including the tube axis, the outer peripheral surface of the inner cylinder diameter-reducing portion is smoothly configured by a straight line, a curve, or a combination of a straight line and a curve up to the upper end of the inner cylinder portion. That is, it means that there is no step on the outer peripheral surface of the inner cylinder diameter-reducing portion. In other words, when the outer peripheral surface of at least the inner cylinder diameter-reducing portion is diameter-reduced, it is desirable that there is always a change in the position in the tube axis direction. Note that a bulge that does not cause a catch in the middle is also allowed.

[0034] (9) The drain member according to any one of the above (1) to (8) may be such that the lower drain member has a protruding portion that extends toward the outer peripheral side at the upper part of the outer cylinder portion and corresponds to the receiving port portion of the joint member to which the outer cylinder portion is connected.

[0035] According to the drain member of the present invention, since the lower drain member is formed on the outer peripheral surface of the outer cylinder diameter-reduced portion toward the outer peripheral side and has a protruding portion corresponding to the receiving port portion of the joint member (such as an elbow on the downstream side) to which the outer cylinder portion is connected, the relative position with the joint can be accurately and efficiently set in the pipe axis direction.

[0036] (10) A second aspect of the present invention is a siphon drain member, which is characterized by comprising the drain member according to any one of the above (1) to (8) and a siphon portion disposed above the upper drain member.

[0037] According to the siphon drain member of the present invention, the inner cylinder portion of the upper drain member can be smoothly inserted into the outer cylinder portion of the lower drain member.

[0038] (1) A third aspect of the present invention is a piping structure, which is characterized by comprising the drain member according to any one of the above (1) to (8).

Effect of the Invention

[0039] According to the drain member, siphon drain member, and piping structure of the present invention, the inner cylinder portion of the upper drain member can be efficiently inserted into a predetermined position of the outer cylinder portion of the lower drain member.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 6D

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 9C

Figure 9D

Figure 10A

Figure 10B

Figure 11A

Figure 11B

Figure 12

Figure 13A

Figure 13B

Figure 14A

Figure 14B

Figure 14C

Figure 14D

Figure 14E

Figure 15A

Figure 15B

Figure 15C

Figure 15D

Figure 15E

Figure 16A

Figure 16B

Figure 16C

Mode for Carrying Out the Invention

[0041] <First Embodiment> Hereinafter, with reference to FIGS. 1 to 6D, the first embodiment of the present invention will be described. FIG. 1 is a view seen from the side for explaining a rain gutter pipe structure including a siphon drain member (drain member) according to the first embodiment of the present invention. FIGS. 2 to 5 are views for explaining the schematic of the siphon drain member according to the first embodiment. In the figure, reference numeral 1 denotes a rain gutter pipe structure (pipe structure), reference numeral 10 denotes a rain gutter, reference numeral 11 denotes a bottom plate, reference numeral 12 denotes a side plate, and reference numeral 11H denotes a lower hole. Further, reference numeral 100 denotes a siphon drain member (drain member), reference numeral 110 denotes a lower drain member, reference numeral 120 denotes an upper drain member, and reference numeral 150 denotes a siphon portion. Note that in the drawings, the shapes and the like are emphasized for easy understanding, and the dimensional relationships and the like in the drawings are not necessarily consistent.

[0042] The eaves gutter piping structure (Piping Structure 1), as shown in Fig. 1, for example, includes an eaves gutter 10, a siphon drain member (drain member) 100 attached to a circular lower hole (through hole) 11H formed in the bottom plate 11 of the eaves gutter 10, a first elbow (elbow member) 20 connected to the lower side of the siphon drain member 100, a downspout 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 downspout 24, and a vertical gutter 30 connected to the downstream side of the second elbow 25.

[0043] As shown in Figs. 1, 2, 4, and 5, for example, the eaves gutter 10 includes a bottom plate 11 and side plates 12 extending upward from both ends in the width direction of the bottom plate 11, and is formed in a groove-shaped cross-section when viewed along the longitudinal direction. Further, a lower hole 11H formed in a circular shape in plan view penetrates the bottom plate 11 in the thickness direction. The eaves gutter 10 is suspended by a rain gutter hanger (not shown) attached to a nose hiding plate (not shown) and is configured to receive rainwater flowing down from the eaves tip (not shown) of the roof.

[0044] In this embodiment, the eaves gutter 10 is, for example, an extruded product formed of a synthetic resin such as rigid vinyl chloride resin, ABS, or AES. Note that the material forming the eaves gutter 10 can be arbitrarily set and is not limited to synthetic resin. For example, it may be formed of a metal extruded product.

[0045] When the eaves gutter 10 is formed of synthetic resin, it is preferably that the linear expansion coefficient is 2.0×10 -5 / °C or less to prevent expansion and contraction due to heat. It is preferable to insert a low-expansion sheet such as a PET resin sheet or an iron sheet extending in the center in the thickness direction of the eaves gutter 10, or to reduce the linear expansion coefficient by blending a low-expansion additive such as wollastonite or carbon fiber into the synthetic resin itself constituting the eaves gutter 10.

[0046] In addition, the eaves gutter 10 has a bottom width of 100 mm or more and 200 mm or less, and a height of 90 mm or more and 150 mm or less, and may be applied to a large-diameter vertical gutter that can flow rainwater at a flow rate of, for example, 4 liters / sec or more and 20 liters / sec or less.

[0047] As shown in FIGS. 1 to 5, the siphon drainage member (drainage member) 100 includes, for example, a lower drainage member 110, an upper drainage member 120, and a siphon portion 150 disposed above the upper drainage member 120, and is attached to the eaves gutter 10. Specifically, the lower drainage member 110 is disposed on the lower surface 11B side of the bottom plate 11 of the eaves gutter 10, and the upper drainage member 120 is disposed on the upper surface 11A side of the bottom plate.

[0048] The material for forming the siphon drainage member 100 can be arbitrarily set. In this embodiment, the siphon drainage member 100 is, for example, an injection molded product formed of a synthetic resin such as rigid vinyl chloride resin, polycarbonate, ABS, or AES. Note that it is not limited to synthetic resin, and it may be formed by casting cast iron, stainless steel, or aluminum. Details of the lower drainage member 110 and the upper drainage member 120 will be described later. Hereinafter, with reference to FIGS. 2 to 5, the siphon portion 150 will be described.

[0049] As shown in FIGS. 2 to 5, the siphon portion 150 includes, for example, a lid member 151, a vertical rib 155 that connects the upper drainage member 120 and the lid member 151, a gripping rib 156, and a guiding guide 157. The siphon portion 150 is disposed above the upper drainage member 120.

[0050] As shown in FIGS. 2 and 3, the lid member 151 is, for example, a disk-shaped member having a circular shape in plan view disposed above the upper drainage member 120. The lid member 151 is coaxial with the tube axis of the upper drainage member 120. And a portion formed between the outer peripheral edge 151A of the lid member 151 and the outer peripheral edge 121C of the upper drain member 120 constitutes an inflow opening 100A through which rainwater W accumulated in the eaves gutter 10 flows into the drain opening portion 121H.

[0051] Note that the inflow opening 100A is in a direction orthogonal to the horizontal plane, and refers to the portion between the outer peripheral edge 151A of the lid 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, when the outer peripheral edge 151A of the lid member 151 is larger than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A is a portion formed between the outer peripheral edge 151A of the lid member 151 and the upper surface 11A of the eaves gutter 10. When the outer peripheral edge 151A of the lid member 151 is smaller than the outer peripheral edge 121C of the upper flange portion 121, the inflow opening 100A is a portion formed between the outer peripheral edge 151A of the lid member 151 and the upper surface 121A of the upper flange portion 121.

[0052] The area of this inflow opening 100A is adjusted according to the size, height, and shape of the lid member 151 described later so as to be larger than the opening area A1 of the drain opening portion 121H described above. In the present embodiment, the area of the inflow opening 100A can be obtained by multiplying the circumference of the circular lid member 151, that is, the length of the outer peripheral edge 151A, by the height H of the lid member 151.

[0053] The lid member 151 is supported by the upper drain member 120 in a state of being supported by a plurality of vertical ribs 155 from below. Further, as described above, the lid member 151 is disposed inside the eaves gutter 10 and at a position spaced upward from the drain opening portion 121H, and forms an inflow opening 100A for allowing rainwater W to flow into the drain opening portion 121H on the upper surface 11A of the eaves gutter 10 below the lid member 151. Also, it is preferable that the lid member 151 is set at a position 10 to 60 mm at a height H upward from the upper surface 11A of the eaves gutter 10.

[0054] Also, the size of the lid member 151 when viewed in plan can be arbitrarily set, but it is preferably arranged so as to close the opening of the dropping port 121H and is set larger than the opening area of the dropping port 121H. Note that it may be set equal to or smaller than the opening area of the dropping port 121H. Also, for example, a through-hole penetrating the dropping port 121H from above may be formed in the vertical direction in the lid member 151.

[0055] 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 bottom surface 10a of the eaves gutter 10, and the diameter of the lid member 151 is set to 150 to 200% of the outer diameter R1 of the opening of the dropping port 121H. When the diameter of the lid member 151 is smaller than 150% of the outer diameter R1 of the opening of the dropping port 121H, the water level in the eaves gutter 10 may be lower than the lid member 151, and there is a possibility that the lid member 151 may not be in contact with the inflowing water. Also, when the diameter of the lid member 151 exceeds 200%, the ratio of the water flow flowing in from the inflow opening 100A colliding with the lid member 151 increases, and the water level in the eaves gutter 10 may become too high compared to the lid member 151, which may reduce the siphon performance.

[0056] Note that for the siphon action to occur, it is necessary for the water level in the eaves gutter 10 to be higher than the inflow opening 100A, and the height H of the lid member 151 needs to be lower than the maximum water level in the eaves gutter 10. For stable occurrence of the siphon action, it is preferable that the height H of the lid member 151 is 0.1 to 0.5 times the height of the maximum water level in the eaves gutter 10, and more preferably 0.2 to 0.45 times the height. Note that the maximum water level in the eaves gutter 10 refers to the lowest one among the heights from the bottom plate 11 of the side plate 12 of the eaves gutter 10.

[0057] Further, the inner diameter (outer opening diameter) R1 of the inner cylinder inner peripheral hole 122H of the inner cylinder part 122 suitable for providing the lid member 151 set at the above-described position is preferably 50 mm or more and 170 mm or less, and more preferably 70 mm or more and 170 mm or less. That is, by setting the outer opening diameter R1 of the drop port part 121H to 50 mm or more, which is the lower limit, it is possible to smoothly drain the large flow of drainage generated in the siphon part (siphon drain member 100) 50. And by setting it to 170 mm or less, which is the upper limit, the size of the joint and the support tool can be prevented from increasing because the accommodation becomes smaller.

[0058] Further, as shown in FIGS. 2 to 5, the lid member 151 is provided with gripping ribs 156 that project upward from the upper surface 151B and are arranged at intervals in the circumferential direction. By grasping the gripping ribs 156, the rotation operation when tightening the siphon drain member 100 can be easily performed.

[0059] Further, the gripping rib 156 is composed of a rib main body 156A extending in the circumferential direction and extending portions 156B protruding from both ends of the rib main body 156A toward the outer peripheral side. Between the gripping ribs 156, 156 adjacent to each other in the circumferential direction, for example, when attaching the siphon drain member 100 to the first elbow 20, a rod-shaped member can be engaged and tightened by rotating the rod-shaped member. In addition, since a gap is formed between the gripping ribs 156, 156, it becomes easier for dust such as fallen leaves in the eaves gutter 10 to pass through, and it is possible to prevent entanglement.

[0060] As shown in FIGS. 3 to 5, the guide guides 157 are provided radially extending from the drain axis O, and a plurality of guide guides 157 having a curve that gradually extends downward as they go toward the drain axis O (lid center) at the central portion in plan view of the lower surface 151C of the lid member 151. The guide guide 157 is for guiding the rainwater W in the eaves gutter 10 from the inflow opening 100A to the drop port part (the opening of the drop port part 121H). Incidentally, the guiding guide 157 may be formed by a funnel-shaped or cylindrical wall portion having holes formed at the upper and lower ends.

[0061] As shown in FIG. 3, the vertical rib 155 connects the upper surface 121A of the upper drain member 120 and the outer peripheral portion of the lower surface 151C of the lid member 151. That is, the lid member 151 is supported from below by a plurality of vertical ribs 155 and held at a position where a predetermined height H is secured from the upper surface 11A of the eaves gutter 10. These vertical ribs 155 are provided at the inflow opening 100A, intersect in the radial direction in plan view, and are formed in a curved shape. That is, the vertical rib 155 has a function of rectifying the rainwater W flowing from the inflow opening 100A into the drop port portion 121H.

[0062] In the siphon portion 150, the inner diameter of the inner cylinder inner peripheral hole 122H of the inner cylinder portion 122 and the upper surface 123A on the inner surface side where the upper flange portion 121 is continuously provided form a tapered surface or a bell mouth shape formed on a curved surface. When the upper surface (connection portion) 123A on the inner surface side is a curved surface, it is preferable that the radius of curvature of the cross section in the direction parallel to the drain axis O is 5 mm to 20 mm. Note that the connection portion between the upper flange portion 121 and the upper surface 123A may be bent upward.

[0063] Next, the operation of the siphon portion 150 of the siphon drain member 100 described above will be described. As shown in FIG. 3, the siphon portion 150 closes the opening of the drop port portion 121H in plan view, and when a large amount of rainwater flows in from the inflow opening 100A during heavy rain, the vertical gutter 30 is filled with water and sealed without sucking air. As a result, a siphon phenomenon can be generated on the downstream side.

[0064] Such a siphon drain member 100 is provided, for example, inside the eaves gutter 10 disposed at the eaves tip of the rain gutter pipe structure 1 attached to a building of a large facility such as a factory or a shopping center, and exhibits a high drainage function.

[0065] The first elbow (elbow member, joint member) 20 is a joint installed on the downstream side of the siphon drain member (drain member) 100. As shown in FIG. 1, the first elbow 20 is connected to the lower side of the siphon drain member 100. As shown in FIG. 1, the first elbow 20 includes a first receiving port (one end) 21, a second receiving port (the other end) 22, and a curved pipe portion 23 that curves approximately 90° in a side view.

[0066] The first receiving port 21 is formed with an inner diameter that can be connected to the lower drain member 110 of the siphon drain member 100. As shown in FIG. 1, a receiving port bottom surface 21A that tapers toward the curved pipe portion 23 is formed at the connection portion with the curved pipe portion 23. This receiving port bottom surface 21A abuts against the inserted end of the pipe sheet to ensure the relative position with the pipe.

[0067] In order to smoothly flow the rainwater W without reducing the flow velocity of the rainwater W flowing in from the first receiving port 21, the curved pipe portion 23 is preferably formed such that the radius of curvature of the outer wall portion (the side with a smaller curvature) and the inner wall portion is greater than at least 64 mm and less than 125 mm when viewed in a cross-section (along the pipe axis) including the pipe axis. The second receiving port 22 of the first elbow 20 is connected to the upstream end of the downspout 24.

[0068] The downspout 24 is a member that draws the rainwater W flowing down from the first elbow 20 horizontally, and conducts the rainwater W flowing down from the siphon drain member 100 horizontally. It is a straight pipe extending along the horizontal direction. The downstream side is connected to the upper end 30A of the vertical pipe 30 by the second elbow 25.

[0069] Also, the downspout 24 preferably has a length (downspout length) from the upstream end to the downstream end 24B of the downspout 24 that is greater than 0 m and less than or equal to 1.5 m, more preferably greater than or equal to 0.6 m and less than or equal to 1.5 m, and even more preferably greater than or equal to 0.6 m and less than or equal to 1.0 m. By setting the length of the downspout within the aforementioned range, the rainwater W flowing down from the first elbow 20 can be smoothly drained in a full-flow state. The downstream end 24B of the downspout 24 is connected to the first receiving port of the second elbow 25. The second elbow 25 has the same configuration as the first elbow 20.

[0070] The upper end 30A of the vertical downspout 30 is connected to the second receiving port of the second elbow 25. The vertical downspout 30 is a member that vertically draws the rainwater W flowing down from the second elbow 25 and is a straight pipe extending along the vertical direction. The lower end side of the vertical downspout 30 is connected to, for example, a catch basin (not shown) that is connected to the ground and buried underground. The catch basin is configured to be connected to a drainage structure such as a sewer pipe via a connecting pipe (not shown).

[0071] The vertical downspout 30 is a straight pipe arranged vertically along the outer wall of the building and is a member that allows the rainwater W flowing down from the second elbow 25 to flow downward. Note that the height from the upper end to the lower end of the vertical 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 setting the length (height dimension) of the vertical downspout within the above range, the siphon phenomenon in the vertical downspout 30 can be generated and maintained well. As the length of the vertical downspout increases, the drainage volume of the rainwater W flowing down to the lower end increases, and the rainwater W rushes into the catch basin.

[0072] In the rain gutter 1 assembled in this way, the rain falling on the roof flows into the siphon drainage member 100 provided in the eaves gutter 10 through the inflow opening 100A, passes through the drop opening 121H, flows through the first elbow 20, the downspout 24, and the second elbow 25, and then flows down to the vertical downspout 30. Then, the rainwater W flowing from the downspout 24 into the vertical pipe 30 flows down into a drain pipe (not shown) buried in the ground. At this time, since the downstream side of the siphon drain member 100 is in a full water state and is water-sealed, the vertical pipe 30 will be in a full water state and flow down, generating a siphon phenomenon in the drop opening portion 121H, the downspout 24, and the vertical pipe 30, and being drained vigorously from the vertical pipe 30 to the drain pipe (not shown) side.

[0073] Here, as the second elbow 25, it is also possible to adopt a configuration in which the first receiving port and the second receiving port have the same diameter. However, as shown in Fig. 11A, it is also possible to adopt a second elbow 25A (reducing elbow) in which the diameter of the first receiving port 26 and the diameter of the second receiving port 27 are different. The second elbow 25A includes a curved pipe portion 28. The curved pipe portion 28 connects the first receiving port 26 and the second receiving port 27. When viewed in the cross-section in the plane including the pipe axis of the curved pipe portion 28, the curvature of the inner peripheral side portion and the curvature of the outer peripheral side portion of the curved pipe portion 28 gradually change and become smaller. At this time, the curvature radius of the inner peripheral side of the curved pipe portion 28 and the curvature radius of the outer peripheral side portion gradually become larger. The second elbow 25A expands in diameter from upstream to downstream.

[0074] Preferably, the nominal diameter of the second receiving port 27 (large-diameter side receiving port, downstream side receiving port) is 1 size or more larger than the nominal diameter of the first receiving port 26 (small-diameter side receiving port, upstream side receiving port) of the second elbow 25A. For example, the nominal diameter of the first receiving port 26 may be 75 (outer diameter 89 mm) or 100 (outer diameter 114 mm). The nominal diameter of the second receiving port 27 may be 100 (outer diameter 114 mm) or 125 (outer diameter 140 mm).

[0075] Also, the joint connecting the downspout 24 and the vertical pipe 30 is not limited to an elbow. For example, a cheese 25B as shown in FIG. 11B may connect the downspout 24 and the vertical pipe 30. The cheese 25B includes a third receiving port 29 in addition to the first receiving port 26 and the second receiving port 27. The second receiving port 27 and the third receiving port 29 are connected through a straight pipe 29a. The curved pipe portion 28 extends laterally from the straight pipe 29a. In the cheese 25B, it is preferable to provide a lid (not shown) on the third receiving port 29. The lid is detachable from the third receiving port 29. The third receiving port 29 functions as a cleaning port. Note that a vertical pipe for draining rainwater from a higher position may be connected without providing a lid. Note that the cheese 25B shown in FIG. 11B is a reduced-diameter cheese in which the diameter of the first receiving port 26 and the diameter of the second receiving port 27 are different. However, in the cheese 25B, the first receiving port 26 and the second receiving port 27 may have the same diameter.

[0076] Thus, adopting a reduced-diameter elbow as the second elbow 25A or a reduced-diameter cheese as the cheese 25B is particularly effective for a rain gutter pipe structure 1A in which a confluence joint 31 (confluence portion) is provided in the vertical pipe 30 as shown in FIG. 12. The confluence joint 31 is provided at an intermediate position in the height direction of the vertical pipe 30. The confluence joint 31 is, for example, a cheese or the like. In the confluence joint 31, rainwater flowing in the vertical pipe 30 merges with rainwater from another rain gutter 10A. When rainwater from another rain gutter 10A merges at an intermediate position of the vertical pipe 30 as in the rain gutter pipe structure 1A, if the capacity of the vertical pipe 30 is small, the inside of the vertical pipe 30 is likely to become full of water, and there is a risk that the rainwater cannot merge even if it tries to merge at the confluence joint 31. Therefore, as described above, by adopting a reduced-diameter elbow (the second elbow 25A) or a reduced-diameter cheese (the cheese 25B) and increasing the capacity of the vertical pipe 30 (enlarging the diameter of the vertical pipe 30), a margin is created in the flow rate allowed in the vertical pipe 30, and the confluence of rainwater is surely realized.

[0077] In the rain gutter pipe structure 1A shown in Fig. 12, the rainwater flowing through the vertical gutter 30 is drained into the rainwater bucket 160. The vertical gutter 30 and the rainwater bucket 160 are connected via the third elbow 161 and the horizontal pipe 162. The lower end of the vertical gutter 30 is buried in the ground. The third elbow 161 is connected to the lower end of the vertical gutter 30. The first end of the horizontal pipe 162 is connected to the third elbow 161. The second end of the horizontal pipe 162 is disposed inside the rainwater bucket 160. The third elbow 161 and the horizontal pipe 162 constitute the drain pipe described above. By adopting a reducing elbow as the second elbow 25A, the rainwater flowing inside the vertical gutter 30 does not reach a full water state and the flow velocity becomes slow. Therefore, splashing of water from the rainwater bucket 160 can be prevented.

[0078] Here, as in the rain gutter pipe structure 1B shown in Fig. 13A, the third elbow 161A may be a reducing elbow. As shown in Figs. 13A and 13B, the third elbow 161A includes a first receiving port 26, a second receiving port 27, and a curved pipe portion 28, similar to the second elbow 25A. The first receiving port 26 is connected to the lower end of the vertical gutter 30. The second receiving port 27 is connected to the first end of the horizontal pipe 162. In this case, the flow velocity becomes slow inside the third elbow 161A. Therefore, splashing of water from the rainwater bucket 160 can be prevented. Note that in the rain gutter pipe structures 1A and 1B, both the second elbow 25A and the third elbow 161 may be reducing elbows. However, it is difficult to adopt a reducing elbow for the third elbow 161A because the third elbow 161A is buried in the ground.

[0079] Next, with reference to Figs. 6A to 6D, the lower drain member 110 and the upper drain member 120 constituting the siphon drain member 100 will be described. FIG. 6A is a longitudinal sectional view showing an assembled state for explaining a schematic configuration of a siphon drain member according to the first embodiment, and FIG. 6B is a longitudinal sectional view showing a disassembled state. Further, FIG. 6C is a longitudinal sectional view for explaining a schematic configuration of a drain port portion of the siphon drain member, and FIG. 6D is a longitudinal sectional view showing a relationship between a lower drain member and a receiving portion of an elbow for explaining a schematic configuration of the siphon drain member. Note that FIGS. 6A and 6B are simplified views in which the siphon portion in the siphon drain member is omitted.

[0080] As described above, the siphon drain member (drain member) 100 includes a lower drain member 110, an upper drain member 120, and a siphon portion 150 disposed above the upper drain member 120.

[0081] As shown in FIGS. 6A and 6B, the lower drain member 110 includes, for example, a lower flange portion 111 disposed on the lower surface 11B of the eaves gutter 10, an outer cylinder portion 112 formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112, and an inner peripheral screw portion 115 formed on the inner peripheral surface of the outer cylinder portion 112.

[0082] The lower flange portion 111 is formed, for example, to have a circular outer shape in plan view, and a receiving hole 111H having a circular shape in plan view is formed on the inner peripheral side. That is, the lower flange portion 111 is formed of a flat plate having a ring shape in plan view. Further, the upper surface 111A on the outer peripheral side of the lower flange portion 111 is formed as a flat surface, and the inner peripheral side is formed as a concave portion recessed downward with respect to the flat surface. Then, the upper surface 111A of the lower flange portion 111 is disposed on the lower surface 11B of the bottom plate 11 of the eaves gutter 10.

[0083] The outer cylinder portion 112 is formed, for example, in a cylindrical shape centered on the tube axis O1, and extends in the vertical direction in a state of being attached to the eaves gutter 10. Further, an outer cylinder inner peripheral hole 112H penetrating vertically is formed inside the outer cylinder portion 112. In addition, an internal thread portion 115 is formed on the inner peripheral surface of the outer cylinder portion 112. Further, at the lower end 112T of the outer cylinder portion 112, four tool mounting recesses (recesses) 118 that are recessed upward are formed at intervals of 90° in the circumferential direction. Note that the position and number of the tool mounting recesses (recesses) 118 can be arbitrarily set. Also, the vertical position of the upper bottom surface 118A of the tool mounting recess (recess) 118 can be arbitrarily set, but it is preferably formed below the lower end portion of the inner cylinder portion 122.

[0084] As shown in FIGS. 6A and 6B, the outer cylinder diameter-reduced portion 113 connects the lower flange portion 111 and the upper end portion of the outer cylinder portion 112 by being reduced in diameter downward. In addition, an insertion guide portion (continuous reduced inner diameter surface) 113G is formed on the inner peripheral surface of the outer cylinder diameter-reduced portion 113. In this embodiment, the insertion guide portion (continuous reduced inner diameter surface) 113G is formed by, for example, an inclined surface on the inner peripheral side of a substantially conical cylinder that is continuously reduced in diameter from the upper end of the outer cylinder diameter-reduced portion 113 to the inner peripheral surface of the outer cylinder portion 112. That is, the insertion guide portion (continuous reduced inner diameter surface) 113G is configured not to have a step or a bulge that causes a catch protruding to the inner peripheral side.

[0085] Note that the shape of the continuous reduced inner diameter surface can be arbitrarily set and is not limited to an inclined surface formed in a substantially conical shape in which a cross section including the tube axis O1 is linearly reduced in diameter. For example, it may be configured such that the cross section is reduced in diameter in a curved shape or may be configured by an inclined surface combining a straight line and a curve.

[0086] The internal thread portion 115 is formed on the inner peripheral surface of the outer cylinder portion 112. Note that various known shapes can be applied to the internal thread portion 115. Specifically, it may be formed at intervals in the circumferential direction or may be formed continuously in the circumferential direction.

[0087] As shown in FIGS. 6A and 6B, the upper drain member 120 includes, for example, an upper flange portion 121 disposed on the upper surface 11A of the bottom plate 11 and having a drain port portion 121H formed on the inner peripheral side, an inner cylinder portion 122 formed below the upper flange portion 121 and extending downward, an inner cylinder diameter-reducing portion 123 connecting the upper flange portion 121 and the upper end portion of the inner cylinder portion 122 and having a reduced diameter as it extends downward, and an outer peripheral thread portion 125 formed on the outer peripheral surface of the inner cylinder portion 122. The inner cylinder portion 122 of the upper drain member 120 is inserted into the outer cylinder 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.

[0088] The upper flange portion 121 is formed, for example, with a circular outer shape in plan view and a circular drain port portion 121H formed on the inner peripheral side in plan view. That is, the upper flange portion 121 is formed in a flat plate shape in a ring shape in 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 10.

[0089] Further, the lower surface 121B of the upper flange portion 121 is formed, for example, with a flat surface on the outer peripheral side and a positioning step portion 126 formed of a cylindrical portion protruding downward along the pipe axis O2 on the inner peripheral side of the flat surface. When the positioning step portion 126 comes into contact with the inner peripheral surface of the lower hole 11H of the eaves gutter 10, the upper drain member 120 can be positioned with respect to the lower hole 11H. The upper surface 121A of the upper flange portion 121 is formed of a gentle curved portion as shown in FIG. 3.

[0090] The inner cylinder portion 122 is formed, for example, in a cylindrical shape that can be inserted into the outer cylinder portion 112 around the pipe axis O2 and extends in the vertical direction in a state of being attached to the eaves gutter 10. An inner cylinder inner peripheral hole 122H penetrating vertically is formed inside the inner cylinder portion 122. An outer peripheral thread portion 125 is formed on the outer peripheral surface of the inner cylinder portion 122.

[0091] As shown in FIGS. 6A and 6B, the inner cylinder diameter-reduced portion 123 connects the upper flange portion 121 and the upper end portion of the inner cylinder portion 122 by being reduced in diameter downward. In this embodiment, the upper surface 123A of the inner cylinder diameter-reduced portion 123 constitutes the flow path surface from the dropping port portion 121H in the siphon portion 150 described above to the inner cylinder inner peripheral hole 122H.

[0092] Further, in this embodiment, the outer peripheral surface of the inner cylinder diameter-reduced portion 123 is a continuously diameter-reduced outer peripheral surface that is continuously reduced in diameter to the outer peripheral surface of the inner cylinder portion 122. Specifically, the outer peripheral surface of the inner cylinder diameter-reduced portion 123 is formed in a smooth shape by a gentle curve that recesses toward the inner peripheral side up to the upper end of the inner cylinder portion 122 in a cross section including the tube axis O1. That is, no step is formed on the outer peripheral surface of the inner cylinder diameter-reduced portion. Note that the continuously diameter-reduced outer peripheral surface may be constituted by a straight line or a line combining a straight line and a curve to form the inner cylinder diameter-reduced portion. Also, whether or not to form the continuously diameter-reduced outer peripheral surface on the outer peripheral surface of the inner cylinder diameter-reduced portion can be arbitrarily set, and a configuration in which the continuously diameter-reduced outer peripheral surface is not formed may also be adopted.

[0093] The outer thread portion 125 is formed on the outer peripheral surface of the inner cylinder portion 122. Note that various known shapes of the outer thread portion 125 that can be screwed with the inner thread portion 115 are applicable. For example, those formed at intervals in the circumferential direction or those formed continuously in the circumferential direction may be used.

[0094] Next, with reference to FIG. 6C, the upper surface 123A of the inner cylinder diameter-reduced portion 123 that forms the flow path surface of the siphon portion 150 will be described. The reference sign P1 shown in FIG. 6 indicates the positions of the lower end portion of the outer cylinder diameter-reduced portion 113 and the upper end portion of the outer cylinder portion 112. As shown in FIG. 6C, the radius of curvature R of the upper surface 123A of the inner cylinder reduced diameter portion 123 is preferably set as large as possible within a possible range in consideration of, for example, the diameter D0 of the lower hole 11H, the diameter D1 of the upper end portion of the inner circumference of the outer cylinder reduced diameter portion 113, the diameter D2 of the dropping port portion 121H, and the height dimension L11 up to the lower end portion P1 of the outer cylinder reduced diameter portion 113. That is, in order to avoid interference between the outer peripheral surface of the inner cylinder reduced diameter portion 123 and the upper end portion of the inner circumference of the outer cylinder reduced diameter portion 113, it is preferable to reduce the curvature of the outer cylinder reduced diameter portion 113, that is, the upper surface 123A, or to increase the diameter D1 of the outer cylinder reduced diameter portion 113.

[0095] Specifically, for example, when the joint (such as an elbow) connected to the lower drain member 110 or the vertical downspout has a nominal diameter of 75, it is preferable to set the radius of curvature R to be 10 mm or more and 30 mm or less. Further, for example, when the nominal diameter is 100, it is preferable to set the radius of curvature R to be 12 mm or more and 40 mm or less, and when the nominal diameter is 125, it is preferable to set the radius of curvature R to be 13 mm or more and 50 mm or less.

[0096] Next, with reference to FIG. 6D, the outer peripheral surface shape of the lower drain member 110 will be described. The outer cylinder reduced diameter portion 113 is not provided with a stopper that abuts against the end surface of the first receiving portion 21 of the downstream joint portion (the first elbow 20). Therefore, as shown in FIG. 6D, it is preferable to set the length dimension L12 up to the upper end portion P1 of the outer cylinder portion 112 to be larger than the length dimension L0 from the end surface of the first receiving portion 21 of the joint portion (the first elbow 20) to the receiving bottom surface 21A. By setting in this way, the relative position in the pipe axis O2 direction between the drain member 100 and the first elbow 20 can be accurately set, and interference between the outer peripheral surface of the outer cylinder reduced diameter portion 113 and the first receiving portion 21 can be prevented.

[0097] Next, the procedure for attaching the siphon drain member 100 described above to the eaves gutter 10 will be described. First, a lower hole (through hole) 11H for attaching the siphon drain member 100 is formed in the bottom plate 11 of the eaves gutter 10. Next, for example, insert the lower drain member 110 into the eaves gutter 10, insert the inner cylinder portion 122 into the lower hole 11H of the eaves gutter 10 and project it downward, and insert and fix the stepped portion 126 of the upper flange portion 121 into the lower hole 11H of the bottom plate 11 of the eaves gutter 10. For example, an adhesive or packing is attached to the lower surface 121B of the upper flange portion 121. Next, insert the outer cylinder portion 112 of the lower drain member 110 into the upper drain member 120, thread the outer peripheral screw portion 125 and the inner peripheral screw portion 115 together, and when they are threaded together to a predetermined position, insert a construction tool (not shown) into the tool mounting recess (recess) 118 and continue to rotate it to occupy up to a predetermined position and fix the drain member 100.

[0098] According to the siphon drain member 100 according to the first embodiment, since the insertion guide portion (continuous reduced inner diameter surface) 113G is formed on the inner peripheral surface of the outer cylinder reduced diameter portion 113 of the lower drain member 110, the inner cylinder portion 122 of the upper drain member 120 is guided inward of the outer cylinder portion 112 without being caught by the inner peripheral surface of the outer cylinder reduced diameter portion 113. As a result, the inner cylinder portion 122 of the upper drain member 120 can be smoothly inserted into the outer cylinder portion 112 of the lower drain member 110.

[0099] According to the siphon drain member 100 according to the first embodiment, since the positioning stepped portion 126 is formed on the lower side surface 121B of the upper flange portion 121, the siphon drain member 100 can be accurately and efficiently attached to the eaves gutter 10.

[0100] According to the siphon drain member 100 according to the first embodiment, since the length dimension L12 of the straight portion of the outer periphery of the outer cylinder portion 112 is formed longer than the length (depth) L0 of the receiving portion of the first elbow 20, the relative positional relationship in the pipe axis O direction with the first elbow 20 can be accurately set.

[0101] <Second Embodiment> Hereinafter, with reference to FIGS. 7A and 7B, a second embodiment of the present invention will be described. FIG. 7A is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the siphon drain member according to the second embodiment, and FIG. 7B is a longitudinal sectional view showing a disassembled state. Note that FIGS. 7A and 7B are diagrams in which the siphon part in the siphon drain member is omitted and simplified. In FIGS. 7A and 7B, reference numeral 200 denotes a siphon drain member (drain member), reference numeral 210 denotes a lower drain member, reference numeral 112L denotes an outer cylinder part, reference numeral 220 denotes an upper drain member, and reference numeral 224 denotes a step part.

[0102] As shown in FIGS. 7A and 7B, the siphon drain member (drain member) 200 includes, for example, a lower drain member 210, an upper drain member 220, and a siphon part (not shown) disposed above the upper drain member 220.

[0103] As shown in FIGS. 7A and 7B, the lower drain member 210 includes, for example, a lower flange part 111 disposed on the lower surface 11B of the eaves gutter 10, an outer cylinder part 112L formed below the lower flange part 111 and extending downward, an outer cylinder reduced diameter part 213 connected below the lower flange part 111, a step part 214 formed below the outer cylinder reduced diameter part 213 and connecting the outer cylinder reduced diameter part 213 and the upper end part of the outer cylinder part 112L, and an inner peripheral screw part 115 formed on the inner peripheral surface of the outer cylinder part 112L.

[0104] The difference between the lower drain member 210 and the lower drain member 110 is that the lower drain member 210 includes an outer cylinder part 112L instead of the outer cylinder part 112, and the lower flange part 111 and the outer cylinder part 112L are connected by an outer cylinder reduced diameter part 223 and a step part (protrusion) 224 instead of the outer cylinder reduced diameter part 113. Since the others are the same as those in the first embodiment, the same reference numerals are used and the description thereof is omitted.

[0105] The outer cylinder part 112L is formed to have a longer vertical dimension than the outer cylinder part 112 of the lower drain member 110 of the drain member 100, for example. Specifically, it is formed to be longer by a dimension corresponding to the guide sleeve (insertion guide part) 122G with respect to the outer cylinder part 112 of the lower drain member 110 according to the first embodiment. Note that the vertical dimension of the outer cylinder portion 112L can be arbitrarily set and may be set to approximately the same degree as the outer cylinder portion 112.

[0106] As shown in FIGS. 7A and 7B, the outer cylinder diameter-reducing portion 213 connects the outer peripheral portions of the lower flange portion 111 and the stepped portion 214 by being reduced in diameter downward. In this embodiment, the outer cylinder diameter-reducing portion 213 is formed, for example, into a substantially conical cylinder that is linearly and gradually reduced in diameter from the lower flange portion 111 to the outer peripheral portion of the stepped portion 214.

[0107] The stepped portion 214 is connected to the upper end portion of the outer cylinder portion 112L and is constituted by a wall portion that is substantially ring-shaped in plan view and extends toward the outer peripheral side in the horizontal direction. Also, the outer peripheral portion of the stepped portion 214 is connected to the lower end portion of the outer cylinder diameter-reducing portion 213. And the lower surface 214A of the stepped portion 214 constitutes a stopper when the outer cylinder portion 112L is inserted into a receiving portion such as an elbow (joint member).

[0108] As shown in FIGS. 7A and 7B, the upper drain member 220 includes, for example, an upper flange portion 121 that is disposed on the upper surface 11A of the eaves gutter 10 and has a drop port portion 121H formed on the inner peripheral side, an inner cylinder portion 122 that is formed below the upper flange portion 121 and extends downward with an outer peripheral thread portion 125 formed on the outer peripheral surface, an inner cylinder diameter-reducing portion 123 that connects the upper end portions of the upper flange portion 121 and the inner cylinder portion 122 and is reduced in diameter downward, and a guide sleeve (insertion guide portion) 122G that is formed in the lower portion of the inner cylinder portion 122.

[0109] The upper drain member 220 is different from the upper drain member 120 in that it includes a guide sleeve (insertion guide portion) 122G formed in the lower portion of the inner cylinder portion 122. Otherwise, it is the same as the first embodiment, so the same reference numerals are given and the description is omitted.

[0110] As shown in FIGS. 7A and 7B, the guide sleeve (insertion guide portion) 122G extends downward from the lower end of the outer peripheral threaded portion 125 of the inner cylinder portion 122, and the outer peripheral surface on the lower side is formed in a cylindrical shape with the same diameter as the outer peripheral surface on the upper side. Therefore, it is suppressed from contacting the inner peripheral surface 113A of the outer cylinder diameter-reducing portion 213 or the upper surface 214B of the stepped portion 224. Note that the shape of the guide sleeve (insertion guide portion) 122G can be arbitrarily set. For example, it may be formed in a tapered shape toward the tip (lower) side, or may be formed in a shape combining a taper and a straight portion. Further, a mound-shaped bulge that does not cause snagging in the middle may be formed.

[0111] The length L21 of the guide sleeve (insertion guide portion) 122G in the direction of the tube axis O2 can be arbitrarily set. However, for example, it is preferably set as shown below. Specifically, it is preferable to set the length L21 of the guide sleeve (insertion guide portion) 122G to 8 mm or more. For example, it is preferable that the length L21 of the guide sleeve (insertion guide portion) 122G is set longer than the height dimension L13 from the upper surface 111A of the lower flange portion 111 shown in FIG. 7A to the upper surface 214B of the positioning stepped portion 214. By setting L21 > L13, it is suppressed that the guide sleeve (insertion guide portion) 122G contacts the upper surface 214B of the positioning stepped portion 214, and the inner cylinder portion 122 can be smoothly inserted into the outer cylinder portion 112.

[0112] Also, it is preferable that the lower end portion 122T of the guide sleeve 122G is configured not to overlap at least a part of the tool mounting recess 118 formed in the outer cylinder portion 112L of the lower drain member 110. As shown in FIG. 7A, it is more preferable that the lower end portion 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118.

[0113] Specifically, as shown in FIG. 7A, when the length L21 of the guide sleeve (insertion guide portion) 122G in the pipe axis O2 direction is set such that L21 < L14 with respect to the length dimension L14 from the corresponding position of the length L21 of the guide sleeve 122G to the upper bottom surface 118A of the tool mounting recess 118, when constructing, a construction tool (not shown) can be inserted up to the upper bottom surface 118A to perform construction efficiently and stably.

[0114] Further, when the length L21 of the guide sleeve (insertion guide portion) 122G is set such that L21 ≤ L15 with respect to the length dimension L15 to the lower end portion 112T of the outer cylinder portion 112L, at least until the construction is completed, a construction tool (not shown) can be engaged with the tool mounting recess 118 to perform construction. Note that, for example, a dedicated tool that does not interfere with the guide sleeve 122G may be mounted on the tool mounting recess 118 for construction. When constructing with such a dedicated tool, it goes without saying that the lower end portion 122T of the guide sleeve (insertion guide portion) 122G may be located below the lower end portion 122T of the outer cylinder portion 112L.

[0115] Also, in the siphon drain member (drain member) 200, instead of lengthening the outer cylinder portion 112L of the lower drain member 210, by lengthening the vertical dimension of the outer cylinder reduced diameter portion 213, the vertical position of the lower end portion 122T of the guide sleeve (insertion guide portion) 122G and the lower end portion 112T of the outer cylinder portion 112L or the upper bottom surface 118A of the tool mounting recess 118 may be adjusted. In this case, when the dimension from the lower end portion 112T of the outer cylinder portion 112L to the lower surface 114A of the stepped portion (protruding portion) 114 is adjusted to match the length of the receiving portion of a joint (such as an elbow) connected to the lower drain member 110, etc., it becomes possible to lengthen the vertical dimension of the outer cylinder reduced diameter portion 213 and expand the diameter D0 of the opening of the receiving hole 111H shown in FIG. 4C. As a result, it becomes possible to expand the diameter D2 of the dropping port portion 121H formed in the upper part of the inner cylinder reduced diameter portion 123 of the upper drain member 220, increase the diameter D1 of the dropping port portion 121H, and reduce the curvature of the outer cylinder reduced diameter portion 113, that is, the upper surface 123A, to form a smooth (gentle) curved surface shape.

[0116] According to the siphon drain member 200 according to the second embodiment, since the upper drain member 220 includes the guide sleeve 122G formed at the lower part of the inner cylinder part 122, the lower drain member 210 can be efficiently and stably inserted inward of the outer cylinder part 112L without contacting the inner side surfaces of the outer cylinder reduced diameter part 213 and the stepped part (projecting part) 214.

[0117] Further, according to the siphon drain member 200, since the lower end part 122T of the guide sleeve 122G is positioned above the upper bottom surface 118A of the tool mounting recess 118, when assembling and constructing the drain member 200, a construction tool (not shown) can be inserted up to the upper bottom surface 118A to perform efficient and stable construction.

[0118] Further, according to the siphon drain member 200, since the length L21 of the guide sleeve 122G in the pipe axis O (O1, O2) direction is set shorter than the length L14 of the outer cylinder part 112L of the lower drain member 210 in the pipe axis O2 direction, it is possible to suppress the guide sleeve 122G from being exposed downward from the outer cylinder part 112L.

[0119] Further, according to the siphon drain member 200, since the lower drain member 210 includes a stepped part (projecting part) 214 that projects outward on the outer periphery below the outer cylinder reduced diameter part 213, the lower surface 214A of the stepped part 214 abuts against the end surface of the first receiving part 21 of the first elbow part (downstream joint) 20 connected to the downstream side of the lower drain member 210, and the relative movement between the lower drain member 210 and the first elbow 20 is suppressed. As a result, the relative positions of the siphon drain member 200 and the first elbow 20 can be accurately and efficiently set.

[0120] <Third Embodiment> Hereinafter, with reference to FIGS. 8A and 8B, a third embodiment of the present invention will be described. FIG. 8A is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the siphon drain member according to the third embodiment, and FIG. 8B is a longitudinal sectional view showing a disassembled state. Note that FIGS. 8A and 8B are simplified views in which the siphon portion in the siphon drain member is omitted. In FIGS. 8A and 8B, reference numeral 300 denotes a siphon drain member (drain member).

[0121] As shown in FIGS. 8A and 8B, the siphon drain member (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 siphon drain member (drain member) 300 has a configuration in which, for example, the lower drain member 310 having an insertion guide portion (continuously reduced inner diameter surface) 113G is combined with the upper drain member 220 having a guide sleeve (insertion guide portion) 122G. Since the upper drain member 220 is the same as that in the first and second embodiments, the same reference numerals are given and the description thereof is omitted.

[0122] As shown in FIGS. 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 cylinder portion 112L formed below the lower flange portion 111 and extending downward, an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112L, and an inner circumferential screw portion 115 formed on the inner circumferential surface of the outer cylinder 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 cylinder reduced diameter portion 113. The lower drain member 310 is different from the lower drain member 110 according to the first embodiment in that it includes the outer cylinder portion 112L according to the second embodiment instead of the outer cylinder portion 112. Since the others are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0123] Further, the length L21 of the guide sleeve (insertion guide portion) 122G can be arbitrarily set. For example, it is preferable to set the length L21 of the guide sleeve 122G to be longer than the height dimension L16 of the outer cylinder diameter-reduced portion 113 starting from the upper surface 111A of the lower flange portion 111 shown in FIG. 8A. By setting L21 > L16, the guide sleeve (insertion guide portion) 122G can be smoothly inserted into the outer cylinder portion 112.

[0124] In addition, in the siphon drain member (drain member) 300, instead of lengthening the outer cylinder portion 112L of the lower drain member 310, by lengthening the vertical dimension of the outer cylinder diameter-reduced portion 113, the vertical position of the lower end portion 122T of the guide sleeve (insertion guide portion) 122G, the lower end portion 112T of the outer cylinder portion 112L, and the upper bottom surface 118A of the tool mounting recess 118 may be adjusted.

[0125] In this case, by lengthening the vertical dimension of the outer cylinder diameter-reduced portion 113, it becomes possible to expand the diameter D0 of the opening of the receiving hole 111H shown in FIG. 4C. As a result, the diameter D2 of the dropping port portion 121H formed in the upper part of the inner cylinder diameter-reduced portion 123 of the upper drain member 220 can be expanded, the diameter D1 of the dropping port portion 121H can be increased, and the curvature of the outer cylinder diameter-reduced portion 113, that is, the upper surface 123A, can be reduced to form a smooth (gentle) curved surface shape.

[0126] According to the siphon drain member 300 according to the third embodiment, since the lower drain member 310 includes an insertion guide portion (continuous reduced inner diameter surface) 113G and the upper drain member 220 includes a guide sleeve (insertion guide portion) 122G, the lower drain member 310 and the upper drain member 220 can be efficiently and stably assembled. [[ID=X]]

[0127] <Fourth Embodiment> Hereinafter, with reference to FIGS. 9A to 9C, a fourth embodiment of the present invention will be described. FIG. 9A is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the siphon drain member according to the fourth embodiment, and FIG. 9B is a longitudinal sectional view showing a disassembled state. Further, FIG. 9C is a longitudinal sectional view for explaining the schematic configuration of the positioning edge portion formed on the upper drain member. Note that FIGS. 9A and 9B are simplified views in which the siphon portion in the siphon drain member is omitted.

[0128] In FIGS. 9A and 9B, reference numeral 400 denotes a siphon drain member (drain member), reference numeral 320 denotes an upper drain member, reference numeral 321 denotes an upper flange portion, and reference numeral 321E denotes a positioning edge portion (bent recess).

[0129] As shown in FIGS. 8A and 8B, the siphon drain member (drain member) 400 includes, for example, a lower drain member 110, an upper drain member 320, and a siphon portion (not shown) disposed above the upper drain member 320. Since the lower drain member 110 is the same as that in the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0130] As shown in FIGS. 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 drain port portion 121H formed on the inner peripheral side, an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward, an inner cylinder diameter-reducing portion 123 connecting the upper ends of the upper flange portion 121 and the inner cylinder portion 122 and having a reduced diameter as it extends downward, and an outer peripheral screw portion 125 formed on the outer peripheral surface of the inner cylinder portion 122.

[0131] The upper drain member 320 further includes a positioning edge portion (bent recess) 321E disposed on the lower surface 321B of the upper flange portion 321. As shown in FIG. 9C, the positioning edge portion (bending recess) 321E is formed, for example, at a position corresponding to the peripheral edge of the lower 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 portion 11E of the bottom plate 11 at the peripheral edge of the lower hole 11H. If the shape of the lower hole 11H is circular, the positioning edge portion (bending recess) 321E is formed in a circular shape having substantially the same diameter or slightly smaller diameter as the lower hole 11H. Although it is preferable that the positioning edge portion (bending recess) 321E is at the same position as the upper surface corner portion 11E of the bottom plate 11, it may be at a position in the vicinity of the peripheral edge of the lower hole 11H where the flat surface on the outer peripheral side is stably arranged on the upper surface of the bottom plate with an adhesive or the like sandwiched therebetween.

[0132] Further, in a cross-section including the tube axis O2, the positioning edge portion (bending recess) 321E is formed by bending the boundary between the flat lower surface (flat surface) 321B of the upper flange portion 321 located on the outer peripheral side of the lower hole 11H and the protruding outer peripheral surface (protruding surface) 323B of the inner tube reduced diameter portion 323 located on the inner peripheral side and protruding downward. In other words, the positioning edge portion (bending recess) 321E is formed at the connection portion between the lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer peripheral surface (protruding surface) 323B of the inner tube reduced diameter portion 323. Further, the positioning edge portion 321E is formed over the entire circumference in the circumferential direction around the lower hole 11H.

[0133] Here, the positioning edge portion (bending recess) 321E refers to a recess that opens at an angle greater than 90° for the intersection angle on the lower side of the flat surface and the protruding surface (in the case where the protruding surface is a curve, the tangential direction at the boundary). The intersection angle on the lower side is preferably 120° or more, and more preferably 150° or more. Also, in order to stably catch on the upper corner portion of the lower hole 11H, for example, the intersection angle is preferably 160° or less.

[0134] Then, the positioning edge portion (bending concave portion) 321E is caught by the upper surface corner portion 11E formed on the upper surface 11A of the peripheral edge portion of the lower hole 11H formed in the bottom plate 11, thereby suppressing the displacement of the upper drain member 320 with respect to the lower hole 11H and enabling the positioning of the upper drain member 320.

[0135] According to the siphon drain member 400 according to the fourth embodiment, since the upper drain member 320 includes the positioning edge portion (bending concave portion) 321E, the positioning step portion 126 based on the inner peripheral surface (inner peripheral wall surface) of the lower hole 11H is not required, so that the adhesive applied to the lower surface 121B of the upper flange portion 121 is suppressed from dripping onto the inner peripheral surface of the lower hole 11H or the lower surface of the bottom plate 11. As a result, the drain member 400 can be positioned with high quality and stability with respect to the lower hole.

[0136] Further, according to the siphon drain member 400, since the lower drain member 110 includes the insertion guide portion (continuously reduced inner diameter surface) 113G, the inner cylinder portion 122 of the upper drain member 320 can be smoothly inserted into the outer cylinder portion 112 of the lower drain member 110.

[0137] <Fifth Embodiment> Hereinafter, with reference to FIGS. 10A and 10B, a fifth embodiment of the present invention will be described. FIG. 10A is a longitudinal sectional view showing an assembled state for explaining the schematic configuration of the siphon drain member according to the fifth embodiment, and FIG. 10B is a longitudinal sectional view showing a disassembled state. Note that FIGS. 10A and 10B are simplified views with the siphon portion omitted. In FIGS. 10A and 10B, reference numeral 500 denotes a siphon drain member (drain member), and reference numeral 420 denotes an upper drain member.

[0138] As shown in FIGS. 10A and 10B, the siphon drain member (drain member) 500 includes, for example, a lower drain member 310, an upper drain member 420, and a siphon portion (not shown) disposed above the upper drain member 420. The lower drain member 310 is the same as that of the third embodiment, and thus the same reference numerals are used and the description thereof is omitted.

[0139] As shown in FIGS. 10A and 10B, the upper drain member 420 includes, for example, an upper flange portion 321 disposed on the upper surface 11A of the eaves gutter 10 and having a drain opening portion 121H formed on the inner peripheral side, an inner cylinder portion 122 formed below the upper flange portion 321 and extending downward with an outer peripheral thread portion 125 formed on the outer peripheral surface, an inner cylinder diameter-reducing portion 123 connecting the upper flange portion 121 and the upper end portion of the inner cylinder portion 122 and having a reduced diameter as it extends downward, and a guide sleeve (insertion guide portion) 122G formed at the lower portion of the inner cylinder portion 122. Further, the upper drain member 420 includes a positioning edge portion (bent recess) 321E disposed on the lower surface 321B of the upper flange portion 321.

[0140] The upper drain member 420 is different from the upper drain member 320 in that it includes a guide sleeve (insertion guide portion) 122G formed at the lower portion of the inner cylinder portion 122. Other aspects are the same as those of the fourth embodiment, and thus the same reference numerals are used and the description thereof is omitted.

[0141] According to the siphon drain member (drain member) 500 according to the fifth embodiment, since the lower drain member 310 includes an insertion guide portion (continuous reduced inner diameter surface) 113G and the upper drain member 420 includes a guide sleeve (insertion guide portion) 122G, the upper drain member 420 can be efficiently and stably inserted into the lower drain member 310.

[0142] Further, according to the siphon drain member 500, since the upper drain member 420 includes a positioning edge portion (bent recess) 321E, the drain member 500 can be positioned with high quality and stability with respect to the lower hole 11H.

[0143] <Other Embodiments> Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

[0144] For example, in the above embodiment, the case where the drain member is the siphon drain member 100 including the siphon portion 150 has been described. However, whether the drain member includes the siphon portion 150 can be arbitrarily set, and a configuration without the siphon portion 150 may also be used. The same applies to the siphon drain members 200, 300, 400, and 500. Also, the combination of the lower drain members 110, 210, 310 and the upper drain members 120, 220, 320 illustrated in the above embodiment may be arbitrarily set.

[0145] Also, in the above embodiment, the case where the insertion guide portion is constituted by the insertion guide portion (continuous reduced inner diameter surface) 113G formed in the outer cylinder reduced diameter portion 113 of the lower drain member 110 and the guide sleeve (insertion guide portion) 122G extending to the lower portion of the inner cylinder portion 122 of the upper drain member 120 has been described. However, the configuration of the insertion guide is not limited to the continuous reduced inner diameter surface 113G and the guide sleeve 122G, and may be arbitrarily set.

[0146] Also, in the above embodiment, the case where the lower drain member reduced diameter portions 113, 213 of the lower drain members 110, 210, 310 are formed in a substantially conical shape in which the cross section including the pipe axis O1 is linearly reduced in diameter has been described. However, the configuration of the lower drain member reduced diameter portions 113, 213 can be arbitrarily set. For example, a configuration in which the cross section including the pipe axis O1 is reduced in diameter in a curved shape, or a slope formed by combining a straight line and a curve may be used. Also, a bulge may be formed within a range where it does not catch on the inner cylinder portion 122 or the guide sleeve 122G.

[0147] In the above-described embodiment, the case where the guide sleeve 122G formed below the inner cylinder portion 122 has a straight shape formed with the same diameter up to the tip end has been described. However, the shape of the guide sleeve can be arbitrarily set. For example, the tip end (lower) side may be formed in a tapered shape with a reduced diameter, or may be configured in a shape combining a straight cylindrical shape portion and a tapered shape. Further, a bulge may be formed within a range where it does not get caught with the outer cylinder reduced diameter portion 113 or the like.

[0148] In the above-described embodiment, the case where the length L21 of the guide sleeve 122G is set to be longer than the height dimension L13 up to the upper surface 214B of the positioning step portion 214 starting from the upper surface 111A of the lower flange portion 111 shown in FIG. 7A or the height dimension L16 up to the lower end portion of the outer cylinder reduced diameter portion 113 shown in FIG. 8A has been described. However, whether to make the length L21 of the guide sleeve 122G longer than the height dimension L13 up to the upper surface 214B of the positioning step portion 214 or the height dimension L16 of the outer cylinder reduced diameter portion 113 can be arbitrarily set.

[0149] In the above-described embodiment, the case where the length L21 up to the lower end 122T of the guide sleeve 122G is formed shorter than the length L14 up to the lower end 112T of the outer cylinder portion 112L has been described. However, how to set the length L21 of the guide sleeve 122G with respect to the length L14 up to the lower end 112T of the outer cylinder portion 112L can be arbitrarily set, and the length L21 of the guide sleeve 122G may be set to be longer than the length L14 of the outer cylinder portion 112L. Similarly, the length up to the lower end 122T of the inner cylinder portion 122 can also be arbitrarily set.

[0150] In the above-described embodiment, the case where the length L21 up to the lower end portion 122T of the guide sleeve 122G is formed shorter than the length L15 up to the upper bottom surface 118A of the tool mounting recess 118 has been described. However, the length of the length L21 of the guide sleeve 122G can be arbitrarily set. For example, it may be set to be longer than the length L14 up to the lower end 112T of the outer cylinder portion 112L.

[0151] Also, in the above embodiment, the case where the upper drain members 120 and 220 include the positioning step portion 126 and the upper drain members 320 and 420 include the positioning edge portion (bent concave portion) 321E has been described. However, whether the upper drain member includes the positioning step portion 126 and the positioning edge portion (bent concave portion) 321E may be arbitrarily set. For example, as shown in FIG. 9D, when the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is bent and connected, if the upper drain member 320C includes the positioning edge portion (bent concave portion) 321E, since there are bent portions above and below the flange portion 321, stress is likely to concentrate between the upper and lower bent portions. Therefore, when the connection portion 324 between the upper flange portion 321 and the upper surface 323A of the upper drain member 320C is bent and connected, it may not include the positioning edge portion (bent concave portion) 321E, and the connection portion 325 between the lower surface (flat surface) 321B of the upper flange portion 321 and the protruding outer peripheral surface (protruding surface) 323B of the inner cylinder diameter-reduced portion 323 may be connected by a smooth arc without a step or a concave portion.

[0152] Also, in the above embodiment, the case where the positioning step portion 214 for setting the positional relationship with each other corresponding to the receiving portion of the joint member such as an elbow is formed below the outer cylinder diameter-reduced portion 213 of the lower drain member 210 and the upper surface 214B of the positioning step portion 214 serves as a stepped surface has been described. However, for example, by providing a redundant portion on the inner peripheral surface side of the positioning step portion 214, the positioning step portion 214 may be configured to form a step portion only with the lower surface 214A so that a stepped surface is not formed on the upper surface 214B of the positioning step portion 214.

[0153] In the above-described embodiment, the upper flange portions 121 and 321 of the upper drain members 120 and 320 have been described as being formed in a ring-shaped flat plate shape (a shape that continuously extends over the entire circumference in the circumferential direction) in plan view. However, like the upper drain members 120A and 320A shown in FIGS. 14A to 14E, a ring shape in which a part of the upper flange portions 121 and 321 is cut out may be used. There may be at least one notch 127 provided in the upper flange portions 121 and 321, and there may be a plurality of notches. When a plurality of notches are provided, it is preferable to provide them at equal intervals in the circumferential direction of the upper flange portions 121 and 321. Furthermore, for example, the upper flange portions 121 and 321 of the upper drain members 120 and 320 may be formed in a gear shape or a discontinuous ring shape in plan view. In this case, the notched portions are arbitrary. When forming the notch 127, the notch 127 may be provided at a location where the vertical rib 155 is formed in the upper flange portions 121 and 321. However, in order to maintain the strength of the vertical rib 155, it is preferable to form the notch 127 at a location where the vertical rib 155 is not formed in the upper flange portions 121 and 321. In order to smoothly allow rainwater to flow into the drain port portion 121H, it is preferable to form the notch 127 in a direction orthogonal to the pipe axis of the upper drain members 120A and 320A. Furthermore, for example, the upper flange portions 121 and 321 of the upper drain members 120 and 320 may be polygonal such as a quadrilateral, pentagon, or hexagon in plan view. In this case, it is preferable that the end on the outer edge side of the vertical rib 155 coincides with the vertex of the polygon. For example, when there are five vertical ribs 155, the upper flange portions 121 and 321 are pentagonal in plan view, and when there are six vertical ribs 155, the upper flange portions 121 and 321 are hexagonal in plan view. The flange portions 121 and 321 and the vertical ribs 155 are arranged such that the end on the outer edge side of the vertical rib 155 is located at each vertex of the polygonal upper flange portions 121 and 321. In the case of a polygonal shape, each vertex may be sharply pointed or chamfered to be arc-shaped.

[0154] In addition, the range of the notch (the size of notch 127) in the upper drain members 120A and 320A is arbitrary. However, in order to prevent the upper drain members 120A and 320A from shifting with respect to the lower hole 11H, the aforementioned range of the notch (the size of notch 127) is preferably set to the range from the outermost circumscribed circle of the upper flange portions 121 and 321 to the positioning step portion 126 or the positioning bent portion 321E. As shown in the upper drain members 120B and 320B in FIGS. 15A to 15E, the notch 127 may be notched in the central direction of the lower hole 11H rather than the positioning step portion 126 or the positioning bent portion 321E. In this case, due to the presence of the notch 127, it becomes possible to eliminate the step formed by the upper flange portions 121 and 321 on the bottom plate 11 of the eaves gutter 10. As a result, rainwater staying on the bottom plate 11 can easily flow into the drain port portion 121H.

[0155] Also, as the diameter D1 of the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113, it may be smaller than the diameter D0 of the lower hole 11H as shown in FIG. 6A, or may be larger than the diameter D0 of the lower hole 11H as shown in FIG. 7A. However, it is not limited to this, and the diameter D1 of the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113 may be the same as the diameter D0 of the lower hole 11H. For example, so that the positioning step portion 126 of the upper drain member and the outer surface of the inner cylinder diameter-reduced portion 123 do not interfere with the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113, the diameter D1 of the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113 may be larger than the inner diameter of the step portion 126 or the diameter of the positioning edge portion (bent concave portion) 321E. However, when a siphon drain member is installed in the eaves gutter, if the positioning step portion 126 of the upper drain member and the outer surface of the inner cylinder diameter-reduced portion 123 do not interfere with the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113, the diameter D1 of the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113 may be smaller than the diameter D0 of the lower hole 11H, the inner diameter of the step portion 126, or the diameter of the positioning edge portion (bent concave portion) 321E. Note that the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113 does not have an acute vertex and may be chamfered or arc-shaped. In this case, the inner peripheral side end when the flat surface facing the eaves gutter bottom surface of the lower flange portion is viewed in plan is defined as the inner peripheral upper end portion of the outer cylinder diameter-reduced portion 113.

[0156] Further, in each of the drawings of the above embodiment, the lower drain member 110 is shown in an integrally formed state including a lower flange portion 111, an outer cylinder portion 112 formed below the lower flange portion 111 and extending downward, and an outer cylinder reduced diameter portion 113 connecting the lower flange portion 111 and the outer cylinder portion 112. However, as the lower drain member, the lower flange portion and the outer cylinder portion may be formed as separate members, and a lower flange member adhesively joined to the bottom surface of the eaves gutter and a cylindrical outer cylinder member having an inner peripheral thread portion on the inner surface may be connected to each other by an adhesive joining or a fitting structure. In the case of the fitting structure, a fitting portion to be fitted, which is provided on the outer surface of the outer cylinder member and has an uneven shape or the like, and a fitting portion extending from the lower flange member and having an uneven shape engaging with the fitting portion to be fitted are fitted to each other, thereby connecting the lower flange member and the outer cylinder member. In this case, the location where the lower flange member and the outer cylinder member are connected does not have to be the upper end of the outer cylinder member, and any outer peripheral surface of the outer cylinder member may be connected to any location of the lower flange member. Further, the upper end of the outer cylinder member in this case may be provided with a guide cylinder portion as an insertion guide portion extending to the bottom surface side of the eaves gutter to such an extent that it does not contact the outer surface of the inner cylinder reduced diameter portion of the upper drain member. By inserting the lower end of the inner cylinder portion of the upper drain member into this guide cylinder portion, the inclination of the upper drain member can be suppressed. The guide cylinder portion may be formed in a shape that is reduced in diameter from the upper end downward, and the outer diameter below the guide cylinder portion is made smaller than the diameter of the lower hole 11H in the bottom surface of the eaves gutter. Also, in this case, either the outer cylinder member or the lower drain member may be connected to the elbow or the vertical gutter. A receiving port or a socket to which the elbow or the vertical gutter can be connected may be provided at the lower end portion of the outer cylinder member or the lower drain member. Note that, in this case, the outer cylinder reduced diameter portion connecting the lower flange member and the outer cylinder member may not be provided, and it may not be in a shape that is reduced in diameter downward. Instead, a member connecting the lower flange member and the outer cylinder member may be provided in either the lower flange member or the outer cylinder member.

[0157] In addition, within the scope not departing from the gist of the present invention, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements, and the above-described embodiments may also be applied in appropriate combination.

Explanation of Signs

[0158] 1, 1A, 1B Rainwater pipe structure (pipe structure) 10 Eaves gutter 11 Bottom plate 11H Lower hole 11E Upper surface corner 12 Side plate 20 Elbow 30 Vertical gutter 100, 200, 300, 400, 500 Siphon drain member (drain member) 110, 210, 310 Lower drain member 111 Lower flange part 111H Receiving hole 112, 112L Outer cylinder part 112H Inner peripheral hole of outer cylinder 113 Reduced diameter part of outer cylinder 113G Insertion guide part (continuous reduced inner diameter surface) 115 Inner peripheral screw part 213 Reduced diameter part of outer cylinder 214 Step part (protruding part) 120, 120A, 120B, 220, 320, 320A, 320B, 320C, 420 Upper drain member 121, 321 Upper flange part 121B, 321B Lower surface of upper flange part 121H Drop opening part 122 Inner cylinder part 122H Inner peripheral hole of inner cylinder 122G Guide sleeve (guide cylinder part, insertion guide part) 123 Reduced diameter part of inner cylinder 123D Step part 125 Outer peripheral screw part 126 Positioning step part 321E Positioning edge part (positioning bent part) 150 Siphon part

Claims

1. A drain member having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, and being attached to an eaves gutter in which a lower hole is 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 in the inner circumference thereof, an outer cylinder portion formed below the lower flange portion and extending downward, an outer cylinder diameter-reducing portion connecting the upper end portions of the lower flange portion and the outer cylinder portion and having a reduced diameter downward, and an inner circumferential screw portion formed on the inner circumferential surface of the outer cylinder portion; an upper drain member having an upper flange portion disposed on the upper surface of the bottom plate and having a dropping port portion formed on the inner circumferential side, an inner cylinder portion formed below the upper flange portion and extending downward and inserted into the outer cylinder portion, an inner cylinder diameter-reducing portion connecting the upper end portions of the upper flange portion and the inner cylinder portion and having a reduced diameter downward, and an outer circumferential screw portion formed on the outer circumferential surface of the inner cylinder portion and screwed with the inner circumferential screw portion; comprising: the upper drain member has a guide sleeve extending downward from the lower end portion of the outer circumferential screw portion and shorter than the length to the lower end of the outer cylinder portion; a lid member disposed above the lower hole; a guiding guide extending below the lid member; a plurality of vertical ribs disposed on the upper surface of the inner cylinder diameter-reducing portion and connected to the lid member (excluding those in which the guiding guide and the vertical ribs are connected); and a bent portion formed at the connection portion between the upper surface of the upper flange portion and the upper surface of the inner cylinder diameter-reducing portion, wherein the guiding guide is formed by a funnel-shaped or cylindrical wall portion having a hole formed therein, the lower surface of the upper flange portion is a flat surface, and the connection portion between the lower surface of the upper flange portion and the upper end of the outer circumferential surface of the inner cylinder diameter-reducing portion is an arc in a cross section including the tube axis, characterized in that it is a drain member.

2. The drain member according to claim 1, wherein the flat surface is provided over the entire circumference of the lower surface of the upper flange portion.

3. The drain member according to claim 1 or 2, wherein gripping ribs are provided on the lid member, and a plurality of the gripping ribs are provided at intervals in the circumferential direction.

4. The drain member according to any one of claims 1 to 3, wherein the lower drain member has a protruding portion extending toward the outer peripheral side at the upper part of the outer cylinder portion and corresponding to a receiving port portion of a joint member to which the outer cylinder portion is connected. The drain member is characterized in that the length of the guide sleeve in the pipe axis direction is longer than the height dimension from the upper surface of the lower flange portion to the upper surface of the protruding portion.

5. The drain member according to any one of claims 1 to 4, wherein the upper drain member, is provided with a continuously reduced-diameter outer peripheral surface that is continuously reduced in diameter from the lower surface of the upper flange portion to the outer peripheral surface of the inner cylinder portion.

6. The drain member according to any one of claims 1 to 5, wherein a recess that is recessed upward from the lower end is formed in the outer cylinder portion of the lower drain member, and the lower end portion of the guide sleeve, is positioned above the upper bottom surface of the recess.

7. A eaves gutter having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, and the drain member according to any one of claims 1 to 6 is mounted in a lower hole formed in the bottom plate.

8. A rain gutter comprising: the eaves gutter; the drain member according to any one of claims 1 to 6 installed on the bottom plate of the eaves gutter; and a vertical gutter connected to the outer cylinder portion.

9. A rain gutter comprising an eaves gutter in which the drain member according to any one of claims 1 to 6 is installed.

10. A rain gutter comprising a vertical gutter to which the drain member according to any one of claims 1 to 6 is connected.

11. A building comprising: a roof having an eaves edge; an eaves gutter disposed at the eaves edge; the drain member according to any one of claims 1 to 6 installed on the bottom surface of the eaves gutter; and a vertical gutter connected to the outer cylinder portion protruding downward from the bottom of the eaves gutter.

12. The building according to claim 11, further comprising a water collecting tray connected to the lower end of the vertical gutter.

13. A method of attaching the drain member according to any one of claims 1 to 6 to the bottom plate of an eaves gutter having a bottom plate and side plates extending upward from both ends in the width direction of the bottom plate, the method comprising: forming a lower hole in the bottom plate; inserting the inner cylinder portion of the upper drain member into the lower hole; inserting and screwing the inner cylinder portion of the upper drain member inserted into the lower hole into the outer cylinder portion of the lower drain member. A method of attaching a drain member.

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