Gutter systems, buildings

Abstract

To provide an elbow for flowing rain water down smoothly.SOLUTION: An elbow 114 is installed at a downstream side of a siphon rain gutter system having an eaves gutter, a cylindrical part penetrating a water collection port formed on a bottom surface of the eaves gutter, and a siphone generation part for generating a siphon phenomenon. The elbow comprises a bent pipe part, and receptacles provided at both ends of the bent pipe part, wherein a radius of curvature of an inner wall surface of an inner peripheral side is greater than 64 mm and smaller than 100 mm in the bent pipe part seen in a cross section in a plane including a tube axis of the bent pipe part.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a siphon drainage system.

Background Art

[0002] Generally, a building is provided with a rain gutter for receiving rainwater flowing down from the roof and discharging it to the ground. The rain gutter is composed of a plurality of sets of members such as an eaves gutter, a water collector, a downspout, a vertical gutter, a connecting pipe, an elbow joint, a cheese joint (hereinafter, each joint is simply referred to as an elbow or a cheese), etc. In recent years, in order to improve the drainage capacity of the rain gutter, a siphon rain gutter system has been proposed in which the inside of the vertical gutter is filled with water to generate a water suction action (so-called siphon phenomenon) and the drainage volume is increased dramatically.

[0003] For example, in the siphon type rainwater drainage device disclosed in Patent Document 1, the upper end of a siphon pipe is connected to the bottom of an eaves gutter attached to the eaves tip. This siphon pipe is provided vertically along the outer wall material of the house and has an opening area of 3 to 13 cm 2 .

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a siphon rain gutter system, at a portion where rainwater is changed from vertical drainage to horizontal drainage (or from horizontal drainage to vertical drainage), an elbow is used as a joint for connecting various gutters and connecting members to each other. As a conventionally standardized elbow, for example, there is a 90° bent elbow (so-called DL).

[0006] However, the radius of curvature of the inner wall portion on the inner peripheral side of the 90° elbow is 0 mm, and the inner wall portion on the inner peripheral side is formed at a right angle. Therefore, when a 90° elbow is used in the siphon rain gutter system, there is a problem that the flow velocity of rainwater decreases at the inner wall portion formed at a right angle on the inner peripheral side. In addition, when vertically and horizontally drawing rainwater, if the downspout or vertical gutter is too short, there is a problem that the flow velocity of rainwater decreases. When the flow velocity of rainwater decreases, the drainage capacity of the siphon rain gutter system decreases, and rainwater may overflow at the siphon generation portion for generating the siphon phenomenon in the rain gutter.

[0007] The present invention has been made in view of the above circumstances, and provides an elbow and a siphon rain gutter system for smoothly flowing down rainwater.

Means for Solving the Problems

[0008] The elbow of the present invention is an elbow installed on the downstream side of a siphon rain gutter system including an eaves gutter, a cylindrical portion penetrating a water inlet formed on the bottom surface of the eaves gutter, and a siphon generation portion for generating a siphon phenomenon, and includes a curved pipe portion and receiving ports provided at both ends of the curved pipe portion. In the curved pipe portion when viewed in a cross section in a plane including the pipe axis of the curved pipe portion, the radius of curvature of the inner wall surface on the inner peripheral side is larger than 64 mm and smaller than 100 mm.

[0009] By using the above-described elbow, rainwater flowing in from one receiving port of the elbow does not stay on the inner wall surface on the inner peripheral surface side, and the flow velocity of rainwater does not decrease at the inner wall portion. Therefore, the rainwater smoothly flows toward the other receiving port of the elbow.

[0010] The opening area of the curved pipe portion of the elbow of the present invention may be 50 cm 2 or more.

[0011] In the above elbow, the hollow part of the bent pipe section where rainwater flows down has a large opening area, and even when applied to a non-residential building having a large roof area, rainwater flowing in from one receiving port of the elbow does not stagnate on the inner wall surface on the inner peripheral surface side, and the flow velocity of the rainwater does not decrease at the inner wall part.

[0012] The siphon rain gutter system of the present invention is a siphon rain gutter system provided with the above elbow as each of a first elbow and a second elbow. One end of the first elbow is connected to the downstream side of the upstream part of the rain gutter having the siphon generating part. One end of a downspout that laterally draws rainwater flowing down the first elbow is connected to the other end of the first elbow. One end of the second elbow is connected to the other end of the downspout. One end of a vertical gutter that vertically draws rainwater flowing down the second elbow is connected to the other end of the second elbow. The other end of the vertical gutter is connected to a drainage mechanism having a width larger than that of the vertical gutter. The length of the downspout is greater than 0 m and within 2.0 m, and the length of the vertical gutter is 2.0 m or more.

[0013] According to the above siphon rain gutter system, when rainwater flows into the bent pipe section from one end of the first elbow connected to the upstream part of the rain gutter in a full water state due to the siphon phenomenon generated in the siphon generating part, the rainwater smoothly flows toward the eaves gutter and the part on the downstream side of the eaves gutter without stagnating on the inner peripheral surface side of the inner wall surface. Further, by the radius of curvature of the bent pipe sections of the first elbow and the second elbow, and the flowing-down distance of the laterally drawn rainwater and the flowing-down distance of the vertically drawn rainwater being within the above ranges, the siphon action from the siphon generating part to the downstream end of the vertical gutter is difficult to interrupt and is well maintained. As a result, rainwater flowing into the first elbow from the siphon generating part does not stagnate on the inner wall surfaces of joints and gutter members, and the flow velocity of the rainwater does not decrease at the inner wall part.

[0014] The siphon rain gutter system of the present invention is a siphon rain gutter system provided with the above-described elbows as the first elbow and the second elbow respectively. One end of the first elbow is connected to the downstream side of the upstream portion of the rain gutter having the siphon generating portion, and one end of a downspout for laterally drawing the rainwater flowing down the first elbow is connected to the other end of the first elbow. One end of the second elbow is connected to the other end of the downspout, and one end of a vertical gutter for vertically drawing the rainwater flowing down the second elbow is connected to the other end of the second elbow. The other end of the vertical gutter is connected to a drainage mechanism. A confluence pipe intersects the vertical gutter at one or more confluence positions between one end and the other end of the vertical gutter. The length of the downspout is greater than 0 m and within 1.0 m, and the distance between one end of the vertical gutter and the most upstream confluence position is 2.0 m or more.

[0015] According to the above-described siphon rain gutter system, when rainwater flows into the bent pipe portion from one end of the first elbow connected to the upstream portion of the rain gutter in a full water state due to the siphon phenomenon generated in the siphon generating portion, the rainwater smoothly flows toward the eaves gutter and the portion downstream of the eaves gutter without staying on the inner peripheral surface side of the inner wall surface. Further, by the radius of curvature of the bent pipe portions of the first elbow and the second elbow, the flowing-down distance of the laterally drawn rainwater, and the flowing-down distance from the upstream end portion of the vertical gutter to the most upstream confluence position being within the above ranges, the siphon action between the siphon generating portion and the downstream end portion of the vertical gutter is hardly interrupted and is well maintained. As a result, the rainwater flowing into the first elbow from the siphon generating portion does not stay on the inner wall surface of the joint or the gutter member, and the flow velocity of the rainwater does not decrease on the inner wall portion.

[0016] In the siphon rain gutter system according to the present invention, the siphon generating portion is a lid member disposed above the bottom surface of the eaves gutter so as to cover the opening of the water collecting port formed on the bottom surface of the eaves gutter in a top view, and the first elbow may be connected to the water collecting port.

[0017] According to the above-described configuration, the rainwater collected in the water collecting port by the eaves gutter is guided between the bottom surface of the eaves gutter and the upper surface of the lid member and flows into the water collecting port and the first elbow in a full water state, so that the siphon phenomenon occurs favorably.

Effect of the Invention

[0018] According to the elbow and siphon rain gutter system of the present invention, rainwater can flow down smoothly.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the elbow and the siphon rain gutter system of the present invention will be described with reference to the drawings. The drawings used in the following description are schematic.

[0021] (First Embodiment) As shown in FIG. 1, the siphon rain gutter system 101 of the first embodiment to which the present invention is applied includes an eaves gutter 10 fixed to the eaves tip so as to be substantially horizontal, an elbow (first elbow) 114 connected to the downstream side of the eaves gutter 10, a downspout 16 connected to the downstream end of the elbow 114, an elbow (second elbow) 118 connected to the downstream end 16a of the downspout 16, and a vertical gutter 20 connected to the downstream end 18b of the elbow 118.

[0022] The eaves gutter 10 is provided under the eaves of a building (not shown). The eaves gutter 10 opens upward and extends in the D1 direction. In a cross-sectional view perpendicular to the D1 direction, the eaves gutter 10 has a bottom 10b and side walls 10s, 10s that rise upward from both sides in the width direction of the bottom 10b (the D2 direction in FIG. 1). The siphon rain gutter system 101 is assumed to be used in non-residential buildings having a large roof area such as factories and railway stations. In such an assumption, in order to ensure a sufficient flow rate for draining rainwater flowing in from a large-area roof, the width of the bottom 10b (the length in the D2 direction) is preferably at least 100 mm or more, more preferably 120 mm or more, and even more preferably 150 mm or more. The upper limit of the width of the bottom 10b is not particularly limited, but the width of the bottom 10b is preferably 300 mm or less.

[0023] At a predetermined position in the D1 direction (longitudinal direction) of the bottom 10b, a water inlet 12 penetrating the bottom 10b is formed. In the D1 direction, the upper surface of the bottom 10b (i.e., the inner surface in the eaves gutter 10) slightly descends toward the water inlet 12. Note that the lower surface of the bottom 10b may be formed substantially horizontally, and only the upper surface of the bottom 10b may descend toward the water inlet 12. The thickness of the bottom 10b may be substantially constant, and the bottom 10b itself may descend toward the water inlet 12.

[0024] A siphon generating part 50 for generating a siphon phenomenon in the siphon rain gutter system 101 is provided in the water inlet 12. Specific configuration examples of the siphon generating part 50 include the siphon drain member 51 shown in FIG. 2 and the siphon drain member 52 shown in FIG. 3. The siphon generating part 50 preferably includes a lid member that covers the opening of the water inlet 12.

[0025] As shown in Fig. 2, the siphon drain member 51 includes a net (lid member) 61 disposed above the water inlet 12, a mounting cylinder 62 having a drain port 70 and extending downward from the water inlet 12, a plurality of vertical ribs (lid members) 63 that connect the net 61 and the mounting cylinder 62 in the D3 direction and are arranged at intervals in the circumferential direction at a position not overlapping the drain port 70 in top view, and a flange upper portion 64 that expands in diameter radially outward from the connection portion between the net 61 and the mounting cylinder 62. The net 61 and the vertical ribs 63 are for removing debris so that debris and the like do not flow into the water inlet 12. The outer diameter of the mounting cylinder 62 is set to a size that can be fitted into the water inlet 12. A male thread is formed on the outer peripheral surface of the mounting cylinder 62. The flange upper portion 64 is locked from above to the upper surface of the bottom portion 10b around the water inlet 12.

[0026] The siphon drain member 51 is connected to the receiving port 30A of the elbow 14 via a connecting member 95. The connecting member 95 includes a flange lower portion 44 that expands in diameter radially outward from the upper end, and a rib 46 that protrudes radially inward from the inner wall surface at a position where it descends by a predetermined height along the D3 direction from the upper end. The flange lower portion 44 is locked from below to the lower surface of the bottom portion 10b around the water inlet 12. The rib 46 is provided to temporarily reduce the inner diameter of the connecting member 95. By reducing the inner diameter of the connecting member 95, an effect similar to the Venturi effect is exerted, a full-flow state is likely to occur, and the siphon phenomenon occurs favorably. A female thread that can be screwed onto the outer peripheral surface of the mounting cylinder 62 is formed on the inner wall surface of the connecting member 95 from the upper end of the connecting member 95 to the rib 46.

[0027] The siphon drain member 51 is attached to the water inlet 12 by screwing the male thread of the mounting cylinder 62 into the female thread of the connecting member 95 and sandwiching the bottom portion 10b around the water inlet 12 between the flange upper portion 64 and the flange lower portion 44. The receiving port 30A of an elbow 114 described later is externally fitted to the lower portion of the connecting member 95. The lower portion of the connecting member 95 and the receiving port 30A may be adhered or fused with an adhesive or the like.

[0028] As shown in Fig. 3, the siphon drain member 52 includes a lid 71 formed in a plate shape, a drop port 80 which is formed and arranged at intervals along the outer periphery of the lid 71 at a position not overlapping the drop port 80 in top view, and a plurality of vertical ribs 73 which extend downward from the bottom surface of the lid 71 to support the lid 71, a guide portion 78 which hangs down from the bottom surface of the lid 71 and is formed radially in top view along the radial direction, and positioning ribs 77 which are arranged at intervals along the outer periphery of the lid 71 and are provided so as to protrude upward from the upper surface of the lid 71. The lower end of the guide portion 78 is formed so as to gradually approach the lid 71 as it proceeds outward from the radial center of the lid 71 in side view, and has a tapered shape or a bell mouth shape. Since the lid 71 reduces the entrainment of air into the elbow 114 and thus into the vertical drain 20, a full flow state is likely to occur, and the siphon phenomenon occurs more favorably.

[0029] The siphon drain member 52 is connected to the receiving port 30A of the elbow 14 via a connecting member 90. The connecting member 90 includes a cylindrical portion 92 that can be fitted into the receiving port 30A, and a flange 94 that expands in diameter from the upper end of the cylindrical portion 92. The connecting member 90 is locked to the bottom portion 10b in a state where the cylindrical portion 92 is inserted through the water collecting port 12 and the bottom surface of the flange 94 is placed on the bottom portion 10b around the water collecting port 12. The bottom surfaces of the plurality of vertical ribs 73 are processed into a shape along the upper surface of the flange 94. The plurality of vertical ribs 73 and the flange 94, and the cylindrical portion 92 and the receiving port 30A may be adhered or fused with an adhesive or the like, respectively.

[0030] The elbow 114 is a joint installed on the downstream side of the siphon generating portion 50. As shown in Fig. 1, one receiving port (one end) 30A of the elbow 14 is connected to the water collecting port 12 on the downstream side (i.e., the side where rainwater accumulates) of the eaves gutter 10 where the siphon generating portion 50 is provided.

[0031] As shown in Fig. 4, the elbow 114 includes a bent pipe portion 132 and receiving ports 30A and 30B provided at both ends of the bent pipe portion 132. The bent pipe portion 132 bends approximately 90° in side view.

[0032] When viewed in a cross-section (plane, the plane of FIG. 4) including the pipe axis A of the bent pipe portion 132, the inner wall surface 133 on the inner peripheral side of the bent pipe portion 132 and the outer wall surface 134 have a radius of curvature R1 and a radius of curvature R2 that are each greater than at least 64 mm and less than 125 m. Based on the point of not reducing the flow velocity of the rainwater W flowing in from the receiving port 30A and allowing the rainwater W to flow more smoothly, the radii of curvature R1 and R2 are preferably greater than 64 mm and less than 90 mm from the viewpoints of fitting and transportation, and preferably greater than 80 mm and less than 100 mm from the viewpoint of drainage performance.

[0033] The axis J2 passing through the center C1 of the receiving port 30A and the axis J3 passing through the center C2 of the receiving port 30B intersect at a predetermined angle θ in a side view. The angle θ is preferably 90° or more and 135° or less, and is, for example, 91.1°. By setting the angle θ as described above, the flow of the rainwater W can be made smooth.

[0034] Let the straight-line distance between the centers C1 and C2 be H, the diameter of the hollow portions of the receiving ports 30A and 30B be D, and the diameter of the hollow portion of the bent pipe portion 132 be E. The distance H is, for example, 99 mm or more and 263 mm or less, and preferably 130 mm or more and 190 mm or less. Taking 88.65 mm as an example, the diameter D is preferably 52 mm or more and 155 mm or less, and more preferably 75 mm or more and 110 mm or less. The diameter E is appropriately set, taking 77.55 mm as an example, so that the cross-sectional area of the bent pipe portion 132 due to the diameter E does not exceed the cross-sectional area of the hollow portion of the downspout 16.

[0035] The elbow 114 is part of the siphon rain gutter system 101 used in non-residential buildings having a large roof area such as factories and railway stations. The opening area of the bent pipe portion 132 is preferably 50 cm 2 or more and 150 cm 2 or less, more preferably 65 cm 2 or more and 125 cm 2 or less, and even more preferably 75 cm 2 or more and 100 cm 2The following is more preferable. By setting the distance H and the diameters D and E within the aforementioned ranges respectively, while achieving the radius of curvature of the inner wall surface 133 described above, the minimum required flow rate for drainage and the dimensions of the elbow 114 can be ensured, and the overall fit of the siphon rain gutter system 101 can be improved.

[0036] The radius of curvature R3 of the inner wall surface 135 on the outer peripheral side of the curved pipe portion 132 and the radius of curvature R4 of the outer wall surface 136 are appropriately set in accordance with the radii of curvature R1, R2, the distance H, the diameters D, E, etc. For example, when the diameter D = 88.65 mm, the diameter E = 77.55 mm, the radius of curvature R2 = 83.7 mm, and the diameter of the outer peripheral surfaces of the inlets 30A and 30B is 96.25 mm, the radius of curvature R4 can be set to 163.3 mm. Let the length of the inlet 30A along the axis J1 and the length of the inlet 30B along the axis J2 be T. As an example, the length T is preferably 25 mm or more and 80 mm or less, and more preferably 35 mm or more and 55 mm or less. When the length T is below the aforementioned upper limit value, when the elbow 114 is molded by injection molding, it is easier to extract the core, and the elbow 114 can be manufactured well. Also, when the length T is below the aforementioned lower limit value, it is possible to prevent the downspout 16 from coming off due to the high pressure and vibration when the siphon action occurs, or water from leaking through the gap between the inlet 30B and the downspout 16. It should be noted that the parameters of the elbow 114 are not limited to the exemplified numerical values, and it is important that they are appropriately set within the preferable range as described above.

[0037] Here, a plane along the horizontal direction passing through the center of curvature Q of the inner wall surfaces 133 and 135 is defined as a reference plane S1. A plane along the vertical direction passing through the center of curvature Q is defined as a reference plane S1. In a side view, a plane that forms a 45° angle with each of the plane along the horizontal direction and the plane along the vertical direction and passes through the center of curvature Q is defined as a reference plane S3. The position where the reference plane S3 intersects the inner wall surface 133 is defined as a reference position P1. In a side view, an angle formed by a virtual line L1 connecting the center of curvature Q and the reference position P1 and a virtual line L2 connecting the center of curvature Q and the position P2 of the upstream end of the inner wall surface 133 is defined as α1. An angle formed by the virtual line L1 and a virtual line L3 connecting the center of curvature Q and the position P3 of the downstream end of the inner wall surface 133 is defined as α2. Each of the angles α1 and α2 is preferably 10° or more and 30° or less. The angles α1 and α2 are preferably equal to each other.

[0038] The position where the reference plane S3 intersects the inner wall surface 135 is defined as a reference position P4. In a side view, an angle formed by a virtual line L4 connecting the center of curvature Q and the reference position P4 and a virtual line L5 connecting the center of curvature Q and the position P5 of the upstream end of the inner wall surface 135 is defined as β1. An angle formed by the virtual line L1 and a virtual line L6 connecting the center of curvature Q and the position P6 of the downstream end of the inner wall surface 135 is defined as β2. Each of the angles β1 and β2 is preferably 10° or more and 45° or less, taking 44.25° as an example. The angles β1 and β2 are preferably equal to each other.

[0039] In a cross-sectional view, an angle formed by the reference plane S3 and the opening surface 141 of the upstream receiving port 30A with the center of curvature Q as the center is defined as φ1. An angle formed by the reference plane S3 and the opening surface 142 of the downstream receiving port 30B with the center of curvature Q as the center is defined as φ2. Each of the angles φ1 and φ2 is preferably 10° or more and 45° or less.

[0040] By having the above configuration, in the elbow 114, sufficient drainage volume and smooth drainage flow are achieved, and at the same time, the overall dimensions of the joint are appropriately suppressed. Further, even when an external force is applied to the downspout 16 due to vibrations or strong winds during the occurrence of the siphon phenomenon, the stress applied to the joint between the eaves gutter 10 and the elbow 114, the elbow 114 itself, etc. can be reduced, and damage to the eaves gutter 10 and the elbow 114 can be prevented. Specifically, the distance (shortest distance) between the bottom 10b and the central axis of the downspout 16 is preferably less than 140 mm, and more preferably less than 130 mm.

[0041] As shown in FIG. 1, the upstream end portion 16a of the downspout 16 is connected to the receiving port 30B of the elbow 114. The downspout 16 is a member that laterally draws the rainwater W flowing down the elbow 114, and is a straight pipe that extends along the D2 direction or slightly separates from the D2 direction as it proceeds downstream. The length F1 from the end portion 16a to the downstream end portion 16b of the downspout 16 is greater than 0 m and 2.0 m or less, preferably 0.6 m or more and 1.5 m or less, and more preferably 0.6 m or more and 1.0 m or less. By having the length G1 within the above range, the rainwater flowing down from the elbow 114 flows down smoothly in a full water state.

[0042] The receiving port 30A of the elbow 118 is connected to the downstream end portion (the other end) 16b of the downspout 16. The elbow 118 has the same configuration as the elbow 114.

[0043] The upstream end 20a of the vertical pipe 20 is connected to the receiving port 30B of the elbow 118. The vertical pipe 20 is a member that vertically draws down the rainwater W flowing down the elbow 118, and is a straight pipe extending along the D3 direction (vertical direction and the opposite direction). The downstream end 20b of the vertical pipe 20 is connected to the ground G and is connected to a known water collection mass (drainage mechanism) 180 buried underground. The water collection mass 180 is connected to a drainage structure such as a sewer pipe 184 via a connecting pipe 182. The water collection mass 180 has a larger width than the vertical pipe 20. The length F2 from the end 20a to the end 20b is 2.0 m or more, preferably 3.0 m or more, and more preferably 4.0 m or more. When the length F2 is within the above range, the siphon phenomenon in the vertical pipe 20 is favorably generated and maintained.

[0044] When the length F2 of the vertical pipe 20 becomes longer, the drainage volume of the rainwater W flowing down to the downstream end 20b increases, and the rainwater W vigorously flows into the interior of the water collection mass 180. Based on this point, as shown in FIG. 5, it is preferable that an elbow 141, a straight pipe 142 extending along the D2 direction, an enlarged diameter joint 144, a straight pipe 146, and an elbow 120 are connected to the downstream end 20b in this order.

[0045] One receiving port 30A of the elbow 141 (elbow 140A) is connected to the downstream end 20b of the vertical pipe 20. The elbow 141 is a combined elbow and includes two elbows 140A and 140B. As shown in FIG. 6, each curved pipe portion 32 of the elbows 140A and 140B bends at approximately 45° in a side view. That is, the axes J3 and J4 passing through the respective receiving ports 30A and 30B intersect at an included angle of 45° in a side view. As shown in FIG. 5, by combining the two elbows 140A and 140B, the axis J3 passing through the receiving port 30A of the elbow 140A and the axis J4 passing through the receiving port 30B of the elbow 140B intersect at 90° in a side view, and an elbow 141 that bends 90° as a whole is formed.

[0046] To the other receiving port 30B of the elbow 141 (elbow 140B), the upstream end of the straight pipe 142 is connected. To the downstream end of the straight pipe 142, the upstream receiving port of the enlarged diameter joint 144 is connected. To the downstream receiving port of the enlarged diameter joint 144, the upstream end of the straight pipe 146 is connected. The diameter of the hollow portion of the straight pipe 146 is larger than the diameter of the hollow portion of the straight pipe 142. The straight pipe 146 penetrates the water collecting mass 180 in the middle of the longitudinal direction along the D2 direction. The downstream end of the straight pipe 146 is arranged inside the water collecting mass 180. To the downstream end of the straight pipe 146, the receiving port 30A of the elbow 120 is connected. The elbow 120 has the same configuration as the elbow 114. The receiving port 30B of the elbow 120 opens downward.

[0047] In the configuration shown in FIG. 5, the rainwater W (omitted in FIG. 5) flowing down the vertical gutter 20 toward the downstream side in the D3 direction is bent by the elbow 141 toward the downstream side in the D2 direction and flows down substantially horizontally through the straight pipe 142, the enlarged diameter joint 144, and the straight pipe 146 toward the downstream side in the D2 direction. Further, the rainwater W is discharged from the elbow 120 toward the downstream side in the D3 direction, that is, downward, and stored in the water collecting mass 180. According to the configuration shown in FIG. 5, by providing the elbow 141, the straight pipe 142, the enlarged diameter joint 144, and the straight pipe 146, the flow velocity and the drainage volume of the rainwater W flowing down the vertical gutter 20 at high speed can be appropriately suppressed. Also, according to the configuration shown in FIG. 5, by providing the elbow 120 at the most downstream end on the downstream side and by opening the receiving port 30B of the elbow 120 downward, it is possible to prevent the rainwater W from colliding with the side wall of the water collecting mass 180, thereby suppressing the ejection of the rainwater W onto the ground due to being bounced upward by the side wall of the water collecting mass 180.

[0048] For example, when the siphon rainwater downspout system 101 is arranged in an 8-story building or the like, the drainage volume to the downspout 20 may reach about 20 L / sec. In the configuration shown in FIG. 5, the diameter of the hollow part of the downspout 20 is 75 mm, the diameter of the hollow part of the straight pipe 146 is 100 mm, the diameter of the hollow part of the connecting pipe 182 is 150 mm, and even when the length of the connecting pipe 182 in the D2 direction is 8 m, it has been confirmed that the rainwater W discharged from the receiving port 30B of the elbow 120 to the water collecting mass 180 does not spout above the water collecting mass 180 and is well drained from the connecting pipe 182.

[0049] Also, among the configurations shown in FIG. 5, the elbow 120 is more preferably the elbow 140C as shown in FIG. 7. The elbow 140C has the same configuration as the elbows 140A and 140B. The receiving port 30B of the elbow 140 opens obliquely downward according to the direction of the axis J4 (see FIG. 6). Since the receiving port 30B of the elbow 140 opens obliquely downward, it is possible to prevent the straight pipe 142, the enlarged diameter joint 144, and the straight pipe 146 from floating upward on the upper side in the D3 direction due to the momentum of the rainwater W discharged from the elbow 140C, and the load on the elbow 141 can be reduced.

[0050] Also, in the configuration shown in FIG. 7, as shown in FIG. 8, the receiving port 30B of the elbow 140C may open obliquely downward when viewed from the D2 direction (that is, the direction along the axis J3 (see FIG. 6) of the receiving port 30A). By opening obliquely downward in this way, the rainwater W discharged from the receiving port 30B of the elbow 120 to the water collecting mass 180 swirls inside the water collecting mass 180, and the dust and mud accumulated at the bottom of the water collecting mass 180 are lifted by the swirling rainwater W, and the dust and mud are efficiently discharged to the outside of the water collecting mass 180 through the connecting pipe 182 together with the rainwater W. Note that, due to the same operational effects, in the configuration shown in FIG. 5, the receiving port 30B of the elbow 120 may also open obliquely downward when viewed from the D2 direction.

[0051] In addition, in the configuration shown in FIG. 7, as shown in FIG. 9, in a plan view, the elbow 140C (particularly, the receiving port 30B) is preferably disposed radially outside the center of the water collecting mass 180. By disposing the elbow 140C in this manner, a swirling flow is likely to occur inside the water collecting mass 180 due to the rainwater W discharged from the receiving port 30B of the elbow 120 to the water collecting mass 180, and the dust and mud accumulated inside the water collecting mass 180 together with the rainwater W are efficiently discharged to the outside of the water collecting mass 180 through the connecting pipe 182. For the same operational effects, in the configuration shown in FIG. 5, when the receiving port 30B of the elbow 120 opens obliquely downward when viewed from the D2 direction, the elbow 120 (particularly, the receiving port 30B) is preferably disposed radially outside the center of the water collecting mass 180.

[0052] The material of each component of the siphon rain gutter system 101 including the elbows 114 and 118 is, for example, vinyl chloride, and particularly rigid vinyl chloride is preferred.

[0053] According to the elbows 14 and 18 and the siphon rain gutter system 101 of the first embodiment described above, the radii of curvature of the inner wall surface 133 and the outer wall surface 134 are larger than 64 mm and smaller than 100 mm. As a result, the rainwater W flowing into the respective receiving ports 30A of the elbows 114 and 118 from the water collecting port 12 can flow smoothly toward the receiving port 30B without being blocked by the inner wall surface 133.

[0054] Further, in the siphon rain gutter system 101 of the first embodiment, by appropriately setting the angles α1, α2, β1, β2, φ1, and φ2 within the above-described ranges, the flowing direction of the rainwater W from the siphon generating portion 50 can be changed at substantially the same rate with respect to the virtual line L1 from the D3 direction to the D2 direction. Therefore, the symmetry of the flow distribution in the cross section orthogonal to the pipe axis A can be increased, and a decrease in the flow velocity of the flowing rainwater W can be surely suppressed. In addition, the sizes of the elbows 114 and 118 can be appropriately reduced, and the accommodation of the siphon rain gutter system 1 can be improved.

[0055] Also, in the siphon rain gutter system 101 of the first embodiment, the receiving port 30A of the elbow 114 is connected to the water inlet 12, the length of the downspout 16 is greater than 0 m and within 2.0 m, and the length of the vertical gutter 20 is 2.0 m or more. According to such a configuration, the rainwater W collected at the water inlet 12 by the eaves gutter 10 is guided to the drain openings 70 and 80 from between the bottom 10b and the net 61 and the lid 71 and between the plurality of vertical ribs 63 and 73, and can flow into the water inlet 12 and the elbow 114 in a full state. When the water level of the rainwater W in the eaves gutter 10 changes from a state lower than the lid 71 of the siphon generating portion 50 (hereinafter referred to as the natural flow-down state, see FIG. 10) to a state where the water level of the rainwater W in the eaves gutter 10 is equal to or higher than the lid 71 (hereinafter referred to as the siphon generating state), the rainwater W from the siphon generating portion 50 directly flows into the elbow 114. In the initial siphon generating state where the water level of the rainwater W in the eaves gutter 10 is approximately the same as the lid 71, as shown in FIG. 11, a siphon phenomenon occurs in the siphon generating portion 50, and the elbow 114 is in a full state on the downstream side of the water inlet 12, leaving no air in the upper part of the elbow 114. After that, as shown in FIG. 12, when the drainage volume from the siphon generating portion 50 reaches the maximum (that is, the water level of the rainwater W in the eaves gutter 10 approaches the highest water level allowed in the eaves gutter 10), a self-siphon is generated inside the elbows 114 and 118 by the full rainwater W. Also, due to the tensile force of the rainwater W on the downstream side, the rainwater W on the upstream side is pulled to the downstream side, and as shown in FIG. 12, the rainwater W flows down in a full state inside the downspout 16, the elbow 118, and the vertical gutter 20.

[0056] In the siphon rain gutter system 101 of the first embodiment, since the siphon generating portion 50 and the elbow 114 are close to each other, even when changing from the siphon generating state illustrated in FIG. 12 to the natural flow down state shown in FIG. 13, as the air entrainment portion that drops from the outer periphery in the radial direction of the siphon generating portion 50 towards the center is shallow, the siphon action is not interrupted and is maintained. Therefore, even when there is a transition between the natural flow down state shown in FIG. 13 and the siphon generating state shown in FIG. 14, the siphon action at the elbow 114 can be maintained well without interruption. Accordingly, according to the elbows 114, 118 and the siphon rain gutter system 101 of the first embodiment, rainwater W can flow down smoothly.

[0057] Note that the siphon rain gutter system 101 of the first embodiment includes two elbows 114, 118 between the eaves gutter 10 and the downspout 20, and includes one overflow gutter 16 between the elbows 114, 118. However, the siphon rain gutter system 101 is not limited to a rain gutter system having such a configuration, and may include at least two elbows and at least one overflow gutter 16 between two or more elbows. Between the eaves gutter 10 and the downspout 20, there may be provided three or more elbows and two or more overflow gutters 16 connected between the three or more elbows.

[0058] (Second Embodiment) Next, a siphon rain gutter system of the second embodiment to which the present invention is applied will be described. Among the components of the siphon rain gutter system 102 shown in FIG. 15, those that are the same as the components of the siphon rain gutter system 101 are denoted by the same reference numerals, and the description thereof will be omitted.

[0059] As shown in Fig. 15, in addition to the configuration of the siphon rain gutter system 101, the siphon rain gutter system 102 of the second embodiment includes a vertical gutter 21 and a confluence pipe 28 connected to the downstream side of the vertical gutter 20, and a cheese 140 connecting the vertical gutters 20, 21 and the confluence pipe 28. In the siphon rain gutter system 102, two vertical gutters 20 and 21 are provided as the vertical gutters on the downstream side of the elbow 118. That is, when the vertical gutters 20 and 21 are grouped as one vertical gutter, in the siphon rain gutter system 102, the confluence pipe 28 intersects these vertical gutters 20 and 21 at the confluence position X1 between the end (one end) 20a of the upstream vertical gutter 20 and the end (the other end) 21b of the downstream vertical gutter 21 among the vertical gutters 20 and 21. The distance F3 from the end 20a to the confluence position X1 is 2.0 m or more.

[0060] The cheese 140 is a joint installed to cause the rainwater W flowing down the vertical gutter 20 toward the lower side in the D3 direction and the rainwater W flowing down the confluence pipe 28 to flow down the vertical gutter 21. The cheese 140 includes a main pipe 145 extending linearly along the D3 direction, receiving ports 130A and 130B provided at both ends of the main pipe 145, a branch pipe 143 that branches and protrudes along the D2 direction from the middle of the main pipe 145 in the D3 direction, and a receiving port 130C provided at the tip of the branch pipe 143. The downstream end 20b of the vertical gutter 20 is connected to the receiving port 130A. The upstream end 21a of the vertical gutter 21 is connected to the receiving port 130B. The downstream end 21b of the vertical gutter 21 is connected to the ground G and is connected to a known water collection mass 180 buried in the ground.

[0061] The confluence pipe 28 is a member that draws the rainwater W flowing down an upstream part of a rain gutter (not shown) horizontally and extends along the D2 direction. The downstream end 28b of the confluence pipe 28 is connected to the receiving port 130C. Although not shown, the configuration upstream of the confluence pipe 28 is not particularly limited. For example, the upstream side of the confluence pipe 28 may be provided with the same configuration as the eaves gutter 10, the elbow 114, the downspout 16, the elbow 118, and the vertical gutter 20.

[0062] The elbows 114 and 118 of the second embodiment have the same configuration as the elbows 114 and 118 of the first embodiment, and thus the same operational effects can be obtained. Also, in the siphon rain gutter system 102 of the second embodiment, the receiving port 30A of the elbow 114 is connected to the water inlet 12, the length of the downspout 16 is greater than 0 m and within 1.0 m, and the distance from the upstream end 20a of the vertical gutter 20 to the confluence position X1 (i.e., the length of the vertical gutter 20) is 2.0 m or more. According to such a configuration, even if there is a transition between the natural flow state shown in FIG. 13 and the siphon generation state shown in FIG. 14, the siphon action at the elbow 114 can be maintained well without interruption (FIGS. 13 and 14). Therefore, according to the elbows 114 and 118 and the siphon rain gutter system 102 of the second embodiment, rainwater can flow down smoothly.

[0063] Note that, similar to the second embodiment, in the siphon rain gutter system 101 of the second embodiment as well, between the eaves gutter 10 and the vertical gutter 20, there is provided a downspout 16 with elbows 110 connected to both ends. The upstream elbow 110 is connected to the bottom 10b of the eaves gutter 10, and the downstream elbow 110 and the vertical gutter 20 are connected. However, it is not limited to this. As long as there are at least two elbows 110 and at least one or more downspouts 16 between the two or more elbows 110, it is sufficient. There may be three or more elbows 110 between the eaves gutter 10 and the vertical gutter 20, and two or more downspouts 16 between the three or more elbows 110.

[0064] In addition, in the above-described siphon rain gutter system 102, the confluence position X1 is only at one location, but the confluence position X may be provided at a plurality of locations. When a plurality of confluence positions X are provided, the distance from the upstream end 20a of the vertical gutter 20 to the most upstream confluence position X1 among the plurality of confluence positions X is defined. In the siphon rain gutter systems of the present invention, such as the siphon rain gutter system 101 of the first embodiment and the siphon rain gutter system 102 of the second embodiment, the distance from the upstream end 20a of the vertical gutter 20 to the position where any change occurs in the flowing direction of the rainwater W (that is, the length of the vertical gutter 20) is set to 2.0 m or more. Examples of where any change occurs in the flowing direction of the rainwater W include "being radiated to the water collection mass 180 having a width larger than that of the vertical gutter 20" as in the first embodiment, "confluencing with the confluence pipe 28" as in the second embodiment, and widely include "an elbow having the same configuration as the elbow 114 or connecting the elbow 141 to the downstream end 20b of the vertical gutter 20 (see FIGS. 5 and 7)", etc.

[0065] As described above, the preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0066] For example, the upstream part of the rain gutter in the present invention is not limited to the eaves gutter 10, and any gutter member or water collector may be used as long as a water inlet can be formed and a siphon generating part can be provided. For example, the upstream part of the rain gutter may include a drain groove formed in the roof slab of a concrete building, and an elbow 114, a downspout 16, an elbow 118, and a vertical gutter 20 buried so as to penetrate the roof slab of the building. In such a siphon drainage system, the siphon generating part 50 may be provided on the bottom surface of the drain groove and above the elbow 114.

[0067] Further, the configuration of the siphon generating section 50 is not limited to the above-described siphon drain members 51 and 52, and any configuration may be used as long as it can cause rainwater to flow into the water inlet 12 in a full state. For example, a member that generates a siphon by a water storage container that stores water as described in JP-A-2012-132192 may be used. The elbow of the present invention may be installed downstream of such a member. If rainwater can flow into the water inlet 12 in a full state without providing any arbitrary member, the water inlet 12 can function as a siphon generating section.

[0068] Further, the siphon rain gutter system of the present invention does not necessarily have to include the elbows 114 and 118 between the eaves gutter 10 and the downspout 16, and between the downspout 16 and the vertical gutter 20. As long as the flow rate of rainwater is not reduced, other elbows or right-angle joints may be provided.

Embodiment

[0069] Subsequently, an embodiment of the elbow according to the present invention will be described. Note that the configuration and the operational effects of the elbow according to the present invention are not limited to the following embodiments.

[0070] (Embodiment 1) As shown in Fig. 16, an experimental model of the siphon rain gutter system 101 of the first embodiment was prepared, a predetermined amount of water was allowed to flow into the eaves gutter 10, the state of siphon generation was observed, and the water level in the eaves gutter 10 was measured. The eaves gutter 10 has a length of 15 m along the D1 direction. The siphon generation part 50 was provided near one end of the eaves gutter 10 in the D1 direction (in Fig. 16, the end on the front side in the D1 direction). The limit water level of the eaves gutter 10 was set to 150 mm. The water level of the eaves gutter 10 was measured at a position separated by a distance Y along the D1 direction from the siphon generation part 50 using a water level gauge, and the distance Y was changed in three types of 0.4 m, 5 m, and 14 m. The radius of curvature of the inner wall surface 133 in the cross-sectional view of the elbows 114 and 118 was set to 83.7 mm, and the opening area of the curved pipe part 132 was set to 5410 mm2. The materials of the eaves gutter 10, the siphon generation part 50, and the elbow 114 of the siphon rain gutter system 1 were made of rigid vinyl chloride. The drainage volume to the eaves gutter 10 was changed in five types of 4 L / sec, 8 L / sec, 12 L / sec, 16 L / sec, and 20 L / sec. The length F1 of the downspout 16 was changed in four types of 1.0 m, 1.5 m, 2.0 m from 0.6 m shown by the solid line in Fig. 16. The length F2 of the vertical gutter 20 was fixed at 2.4 m. The water discharged from the vertical gutter 20 was pumped up with a container.

[0071] FIG. 17 is a graph showing changes in the water level of the eaves gutter 10 with respect to the distance Y and the length F1 when the drainage volume to the eaves gutter 10 is changed in five types. As shown in FIG. 17, even when a length of 15 m of the eaves gutter 10 is secured, as the downspout 16 becomes longer, it becomes difficult to draw water downstream. Specifically, in the cases where the length F1 of the downspout 16 is 0.6 m and 1.0 m respectively, as the drainage volume to the eaves gutter 10 and the distance Y increase, the water level in the eaves gutter 10 rises, but it remains within the range of less than 150 mm which is the limit water level of the eaves gutter 10. The drainage performance slightly decreased when the length F1 exceeded 1 m. In the case where the length F1 = 1.5 m, if the drainage volume to the eaves gutter 10 is up to 16 L / sec, the water level in the eaves gutter 10 remains within the range of less than 150 mm, but when it reaches 20 L / sec, water overflows from the eaves gutter 10 and the measurement becomes impossible. In the case where the length F1 = 2.0 m, if the drainage volume to the eaves gutter 10 is up to 12 L / sec, the water level in the eaves gutter 10 remains within the range of less than 150 mm, but when the drainage volume to the eaves gutter 10 reaches 16 L / sec, water overflows from the eaves gutter 10 and the measurement becomes impossible.

[0072] That is, from the results of Example 1, it was confirmed that the length F1 to the end portion 16b on the downstream side of the downspout 16 is greater than at least 0 m and 2.0 m or less, preferably 0.6 m or more and 1.5 m or less, and more preferably 0.6 m or more and 1.0 m or less.

[0073] FIG. 18 is a diagram showing the results of observing the initial stability and drainage capacity when the siphon generating part 50 is changed to seven types from No. 1 to No. 7. In this observation, the distance Y was 1.0 m and the length F1 was 3.0 m. Regarding the evaluation of the initial stability, if the water level at the time of siphon action generation was 90 mm or less when the drainage volume to the eaves gutter 10 was 12 L / sec, it was marked as "〇"; if it exceeded 90 mm and was 120 mm or less, it was marked as "△"; if it exceeded 120 mm, it was marked as "×". Regarding the evaluation of the drainage capacity, if the maximum water level was 120 mm or less when the drainage volume to the eaves gutter 10 was 12 L / sec, it was marked as "〇"; if it exceeded 120 mm and was 150 mm or less, it was marked as "△"; if it exceeded 150 mm, it was marked as "×". As shown in FIG. 18, the configurations of the seven types of siphon generating parts vary from a simple "funnel-shaped" configuration to a relatively complex "lid part mesh". For example, the initial stability of "support + vortex suppression rib" became "×". On the other hand, regarding the drainage capacity, for example, although it was "△" for "support + vortex suppression rib", it was "〇" for the configurations of the other six types of siphon generating parts 50. Thus, it was confirmed that in the siphon rain gutter system 101, good drainage characteristics can be obtained even when using various types of siphon generating part 50 configurations from relatively simple ones.

[0074] (Example 2) As shown in FIG. 19, an experimental model of the siphon rain gutter system 102 of the second embodiment was prepared, a predetermined amount of water was allowed to flow into the eaves gutters 10A and 10B, the state of siphon generation was observed, and the water level in the eaves gutter 10 was measured. On the upstream side of the confluence pipe 28, the elbow 119, the vertical gutter 20B, the elbow 118B, the downspout 16B, the elbow 114B, the connecting member 90, the siphon generating part 52B, and the eaves gutter 10B were connected in this order from the nearer side. The elbow 119 has the same configuration as the elbow 114 described in the first embodiment.

[0075] The water levels of the eaves gutters 10A and 10B were measured at positions 0.4 m away from the siphon generating section 50 along the D1 direction using the aforementioned water level gauge (omitted in FIG. 19). The radius of curvature of the inner wall surface 133 in the cross-sectional view of the elbows 114A, 114B, 118A, 118B, and 119 was set to 83.7 mm, and the opening area of the curved pipe section 132 was set to 5410 mm2. The drainage volume to the eaves gutter 10A was changed in seven types: 2 L / sec, 4 L / sec, 6 L / sec, 8 L / sec, 10 L / sec, 12 L / sec, and 14 L / sec. The drainage volume to the eaves gutter 10B (i.e., the drainage volume to the confluence pipe 28) was changed in three types: 4 L / sec, 2 L / sec, and 0 L / sec (i.e., a state where no water flows into the confluence pipe 28). The length F1 of the downspouts 16A and 16B was fixed at 0.6 m. The distance F3 from the upstream end of the vertical pipe 20 to the confluence position X1 was changed in three types: 0 m (i.e., a state where a short pipe was inserted into the downstream receiving port of the elbow 118A and the upstream receiving port of the cheese 140 was in contact), 3.0 m, and 15 m by changing the position of the cheese 140 in the longitudinal direction of the vertical pipe. The water discharged from the vertical pipe 21 was pumped up with a container.

[0076] FIG. 20 is a graph showing changes in the water level of the eaves gutter 10A (main pipe) with respect to changes in the drainage volume to the combined pipe 28 (branch pipe) and the distance F3 when the drainage volume to the eaves gutter 10A (main pipe) is changed in seven types. As shown in FIG. 20, when the inflow of water into the combined pipe 28 is small, air enters the water in the hollow parts of various joints and gutter members, and the siphon phenomenon on the main pipe side is not exhibited. Specifically, as the drainage volume to the combined pipe 28 decreases or the distance Y increases, the water level in the eaves gutter 10A rises. When the drainage volume to the combined pipe 28 is 4 L / sec, the water level in the eaves gutter 10A is within the range of less than 150 mm regardless of whether the distance F3 is 0 m, 3.0 m, or 15 m and regardless of which of the seven types the drainage volume to the eaves gutter 10A is. On the other hand, when the drainage volume to the combined pipe 28 decreases to 2 L / sec, the water level in the eaves gutter 10A is within the range of less than 150 mm if the drainage volume to the eaves gutter 10A is 12 L / sec or less, but when the drainage volume to the eaves gutter 10A reaches 14 L / sec, water overflows from the eaves gutter 10A and measurement becomes impossible. Also, when the drainage volume to the combined pipe 28 decreases to 0 L / sec, the water level in the eaves gutter 10A is within the range of less than 150 mm if the drainage volume to the eaves gutter 10A is 8 L / sec or less, but when the drainage volume to the eaves gutter 10A reaches 10 L / sec, water overflows from the eaves gutter 10A and measurement becomes impossible.

[0077] That is, from the results of Example 2, it was confirmed that the distance F3 is preferably 2.0 m or more. Also, it was confirmed that the drainage volume to the connecting pipe 28 is preferably at least 4 L / sec or more.

Description of Reference Numerals

[0078] 101, 102... Siphon rain gutter system 114, 118... Elbow 30A, 30B... Inlet 32... Curved pipe 133... Inner wall surface 134... Inner wall surface 50... Siphon generation part

Claims

1. Eaves gutters and A drain penetrating a water collection port formed on the bottom surface of the eaves gutter; an elbow connected to the downstream side of the drain, The drain is an attachment tube inserted into the water collection port; an upper flange portion that expands in the radial direction from the upper end of the mounting tube; a plurality of longitudinal ribs provided on the upper surface of the flange upper portion, The elbow is a curved pipe portion having an inner wall surface and an outer wall surface on the inner periphery side, the radius of curvature of which is greater than 64 mm and smaller than 125 mm when viewed in a cross section on a plane including the pipe axis; A socket is provided at both ends of the curved pipe portion and is a hollow portion having a diameter of 52 mm or more and 155 mm or less. Rain gutter system.

2. The gutter system of claim 1 , wherein the drain comprises a cover disposed above the water collection opening.

3. The drain has a guide portion below the lid, The lower end of the guide portion is formed so as to approach the lid from the radial center of the lid toward the outside in a side view. The gutter system of claim 2.

4. The guide portion has a tapered or bell-mouth shape in side view. The gutter system of claim 3.

5. The drain is a connecting member into which the mounting tube is inserted; A gutter system according to any one of claims 1 to 4.

6. a call pipe connected to one end of the elbow; The length of the call gutter is greater than 0 m and less than 2.0 m. A gutter system according to any one of claims 1 to 5.

7. Another elbow connected to the other end of the call pipe; a downspout connected to the other end of the other elbow, The length of the downspout is 3.0 m or more. The gutter system of claim 6.

8. A building comprising a gutter system according to any one of claims 1 to 7.

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