Trough system

Abstract

To provide a trough system, particularly a large trough system with a reduced diameter part, which can more reliably produce a siphon phenomenon and stably propagate the produced siphon phenomenon to an upstream portion.SOLUTION: A trough system 1 comprises an eaves gutter 10, a downspout 45, a connection joint 35 disposed downstream of the eaves gutter and connected to an upper end part of the downspout, and a siphon joint 50 having a reduced diameter part and disposed on the downspout. A flow channel cross section S of the eaves gutter is 11000 mm2 or more. An inner diameter of the downspout is 65 mm or more. A length L7 of the downspout located between the connection joint and the siphon joint is 1 m or more.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rain gutter system.

Background Art

[0002] Conventionally, in a rain gutter system having a reduced-diameter portion in a downspout, it is known that a siphon phenomenon occurs (see, for example, Patent Document 1). In this rain gutter system, rainwater (water) is accumulated in the reduced-diameter portion. Then, due to the gravity acting on the accumulated rainwater, a siphon phenomenon occurs.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The rain gutter system of Patent Document 1 is a small rain gutter system used in houses and the like. On the other hand, a large rain gutter system used in logistics warehouses, factories, etc. has been studied. In this type of rain gutter system, it is necessary to increase the flow path cross-sectional area of the eaves gutter and the inner diameter of the downspout in accordance with the flow rate of the discharged rainwater. By the way, when there is an elbow (connection joint) between the eaves gutter and the reduced-diameter portion, there are cases where the siphon phenomenon does not occur in the reduced-diameter portion, or the siphon phenomenon generated in the reduced-diameter portion does not reach the eaves gutter on the upstream side where the rainwater flows. In such cases, rainwater that is not discharged from the eaves gutter to the reduced-diameter portion accumulates, and there is a risk of rainwater overflowing from the eaves gutter.

[0005] The present invention has been made in view of such problems, and an object of the present invention is to provide a rain gutter system that can more surely generate a siphon phenomenon and stably transmit the generated siphon phenomenon to the upstream portion even in a large rain gutter system provided with a reduced-diameter portion.

Means for Solving the Problem

[0006] To solve the above problems, the present invention proposes the following means. The rain gutter system of the present invention includes an eaves gutter, a downspout, a connection joint disposed downstream of the eaves gutter and connected to the upper end of the downspout, and a siphon joint provided in the downspout and having a reduced diameter portion, and is a rain gutter system characterized in that the flow channel cross-sectional area of the eaves gutter is 11000 mm 2 or more, the inner diameter of the downspout is 65 mm or more, and the length of the downspout located between the connection joint and the siphon joint is 1 m or more. The flow channel cross-sectional area of the eaves gutter referred to here means the cross-sectional area through which rainwater can flow in the eaves gutter when viewed along the longitudinal direction of the eaves gutter.

[0007] According to the present invention, the flow channel cross-sectional area of the eaves gutter is 11000 mm 2 or more, and the inner diameter of the downspout is 65 mm or more. Therefore, the rain gutter system can be used as a large rain gutter system used in a logistics warehouse or the like. Since the siphon joint provided in the downspout has a reduced diameter portion, the flow rate of rainwater flowing into the reduced diameter portion is larger than the flow rate of rainwater flowing out from the downstream side of the reduced diameter portion. For this reason, rainwater is likely to accumulate in the reduced diameter portion. When rainwater accumulates in the reduced diameter portion, the downspout disposed downstream of the reduced diameter portion becomes full. Then, the rainwater in the reduced diameter portion is pulled by the rainwater in the downspout disposed downstream of the reduced diameter portion, and a siphon phenomenon occurs, and the rainwater in the rain gutter system flows downstream vigorously. At this time, the inventors of the present application have found that when the length of the downspout located between the connection joint and the siphon joint is 1 m or more, the siphon phenomenon can be more reliably generated by the siphon joint having a reduced diameter portion, and the siphon phenomenon generated by the siphon joint can be stably transmitted to the upstream portion in the rain gutter system. Therefore, even in a large rain gutter system provided with a reduced diameter portion, the siphon phenomenon can be more reliably generated, and the generated siphon phenomenon can be stably transmitted to the upstream portion.

[0008] Further, in the rain gutter system, in a cross section including the axis of the connection joint, the radius of curvature of the inner wall surface on the inner peripheral side of the connection joint may be larger than 64 mm and smaller than 125 mm. According to this invention, rainwater flowing into the connection joint from one end in the direction along the axis of the connection joint does not stagnate on the inner wall surface on the inner peripheral side of the connection joint, and it is difficult for the flow velocity of the rainwater to decrease on the inner wall surface. For this reason, the rainwater flowing into the connection joint can be smoothly flowed toward the other end in the direction along the axis of the connection joint.

[0009] Further, in the rain gutter system, the angle formed between the axes of the connection portions provided at both ends of the connection joint may be 45° or less. The angle formed between the axes of the connection portions referred to here means the smaller angle of the angles formed between the two axes. According to this invention, rainwater flowing into the connection joint from one connection portion of the connection joint does not stagnate in the connection joint, and it is difficult for the flow velocity of the rainwater to decrease in the connection joint. For this reason, the rainwater flowing into the connection joint can be smoothly flowed toward the other connection portion of the connection joint.

[0010] Further, in the rain gutter system, a downspout connected to the downstream side of the eaves gutter and connected to the vertical gutter is provided, the length of the downspout is 3 m or less, and the angle formed between the axis of the downspout and the axis of the vertical gutter may be 45° or less. The angle formed between the axis of the downspout and the axis of the vertical gutter referred to here means the smaller angle of the angles formed between the two axes. According to this invention, the flow rate of rainwater discharged per unit time from the rain gutter system can be increased.

[0011] Further, in the rain gutter system, it may include an underground buried pipe connected to the downstream end of the vertical gutter and a diameter-expanded portion provided between the siphon joint and the underground buried pipe in the vertical gutter. According to the present invention, by making rainwater become negative pressure within the enlarged diameter portion, the flow rate of rainwater in the portion upstream of the enlarged diameter portion in the vertical downspout can be further increased. Therefore, the flow rate of rainwater flowing through the rain gutter system can be further increased.

Effect of the Invention

[0012] According to the rain gutter system of the present invention, even in a large rain gutter system provided with a reduced diameter portion, the siphon phenomenon can be more reliably generated, and the generated siphon phenomenon can be stably transmitted to the upstream portion.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0014] (First Embodiment) Hereinafter, a first embodiment of the rain gutter system according to the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the rain gutter system 1 of the present embodiment is a large rain gutter system used for a building 200 such as a logistics warehouse. The rain gutter system 1 includes an eaves gutter 10, a first connection joint 20, a downspout 30, a second connection joint (connection joint) 35, a vertical gutter 45, and a siphon joint 50. The eaves gutter 10 is disposed below the eaves of the building 200. That is, the eaves gutter 10 is disposed below the end 201a of the roof 201 of the building 200. The eaves gutter 10 extends along a first direction X along the end 201a of the roof 201. In FIG. 1, the eaves gutter 10 is broken in a direction orthogonal to the first direction X. For example, the first direction X is a direction along a horizontal plane. The eaves gutter 10 is formed in a U shape with an upper opening. The eaves gutter 10 includes a bottom wall 11, a first side wall 12, and a second side wall 13.

[0015] The bottom wall 11 is formed in a plate shape with the vertical direction Z as the thickness direction. The upper surface of the bottom wall 11 is the bottom surface 11a of the eaves gutter 10. An opening 11b that penetrates the bottom wall 11 in the vertical direction Z is formed in the bottom surface 11a of the bottom wall 11. For example, the opening 11b is circular in plan view. Note that the opening 11b may be rectangular or the like in plan view. The width direction of the bottom wall 11 is a second direction Y that is orthogonal to the first direction X and the vertical direction Z, respectively.

[0016] The first side wall 12 rises upward from the end (first end) on the first side in the second direction Y of the bottom wall 11. The first side wall 12 is disposed so as to be inclined gradually toward the first side in the second direction Y as it goes upward. The second side wall 13 rises upward from the end (second end) on the second side opposite to the first side in the second direction Y of the bottom wall 11. The second side wall 13 is disposed so as to be inclined gradually toward the second side in the second direction Y as it goes upward. For example, the eaves gutter 10 is formed by bending a vinyl chloride steel plate or the like. In this example, the upper end of the first side wall 12 is disposed above the upper end of the second side wall 13. The eaves gutter 10 of this example is a so-called front-high gutter. The first side wall 12 is disposed on the first side in the second direction Y from the end 201a of the roof 201 when viewed in the vertical direction Z. The second side wall 13 is disposed on the second side in the second direction Y from the end 201a of the roof 201 when viewed in the vertical direction Z.

[0017] The flow path cross-sectional area of the eaves gutter 10 means the cross-sectional area through which rainwater can flow in the eaves gutter 10 when viewed along the longitudinal direction (first direction X) of the eaves gutter 10. Here, a reference line L1 along the horizontal plane passing through the upper end of the second side wall 13 is defined. When rainwater in the eaves gutter 10 flows above the reference line L1, it overflows to the outside from the second side wall 13. The flow path cross-sectional area S means the area surrounded by the bottom wall 11, the first side wall 12, the second side wall 13, and the reference line L1. The flow path cross-sectional area S is 11000 mm 2 or more. The flow path cross-sectional area S is preferably 29000 mm 2 or more, and more preferably 40000 mm 2 or more.

[0018] The eaves gutter 10 is fixed to the building 200 by a fixture (not shown). The eaves gutter 10 is preferably arranged to have an appropriate water gradient with respect to the horizontal plane. Note that the eaves gutter may be a so-called parallel gutter or the like in which the position in the vertical direction Z of the upper end of the first side wall and the position in the vertical direction Z of the upper end of the second side wall are equal to each other. When the eaves gutter is a parallel gutter, the flow path cross-sectional area S means the area surrounded by the bottom wall, the first side wall, the second side wall, and a reference line along the horizontal plane passing through the upper end of each side wall.

[0019] The first connecting joint 20 includes a curved pipe portion 21, a first connecting portion 22, and a second connecting portion 23. In the cross-section including the axis of the curved pipe portion 21, the central angle of the curved pipe portion 21 is about 45°. The first connection part 22 is arranged at the first end in the axial direction of the bent pipe part 21. The first connection part 22 is connected to the peripheral part of the opening 11b in the eaves gutter 10. The second connection part 23 is a receiving port. The inner diameter of the second connection part 23 is larger than the inner diameter of the bent pipe part 21. The second connection part 23 is arranged at the second end opposite to the first end in the axial direction of the bent pipe part 21. Note that in the first connection joint, the second connection part may be a male connector.

[0020] The downspout 30 is formed in a straight tubular shape. The first end of the downspout 30 is inserted into the second connection part 23 of the first connection joint 20. The second connection part 23 and the downspout 30 are held in a watertight manner. The downspout 30 is connected to the downstream side in the eaves gutter 10 where rainwater flows. The first connection joint 20 connects the eaves gutter 10 and the downspout 30. That is, the downspout 30 is connected to the downstream side of the eaves gutter 10. The length of the downspout 30 is 3 m or less. The length of the downspout 30 mentioned here means the length of the part of the downspout 30 that is not covered by the receiving port. In this example, it means the length L6 obtained by subtracting the length covered by the second connection part 23 of the first connection joint 20, which is the receiving port, and the first connection part 37 of the second connection joint 35 described later, from the actual length of the downspout 30. The length L6 of the downspout 30 is more preferably 2 m or less. The lower limit of the length L6 is not particularly limited, and the end of the second connection part 23 of the first connection joint 20 and the end of the first connection part 37 of the second connection joint 35 may be in contact. In this case, the downspout 30 has a length that is hidden by the second connection part 23 and the first connection part 37.

[0021] As shown in FIGS. 1 and 2, the second connection joint 35 includes a bent pipe part 36, a first connection part (connection part) 37, and a second connection part (connection part) 38. Note that FIG. 2 is a cross-sectional view including the axis of the second connection joint 35. As shown in FIG. 2, in this embodiment, the central angle θ1 of the curved pipe portion 36 is approximately 45°. The first connection portion 37 is a receiving port. The inner diameter of the first connection portion 37 is larger than the inner diameter of the curved pipe portion 36. At the connection portion between the curved pipe portion 36 and the first connection portion 37, a first step portion 39 that protrudes radially inward from the first connection portion 37 and reaches the curved pipe portion 36 is formed.

[0022] The second connection portion 38 is a receiving port. The inner diameter of the second connection portion 38 is larger than the inner diameter of the curved pipe portion 36. At the connection portion between the curved pipe portion 36 and the second connection portion 38, a second step portion 40 that protrudes radially inward from the second connection portion 38 and reaches the curved pipe portion 36 is formed. The first connection portion 37 and the second connection portion 38 are provided at both ends of the second connection joint 35. The angle θ2 formed by the axis O1 of the first connection portion 37 and the axis O2 of the second connection portion 38 is approximately 45° (45°). The angle θ2 formed by the axis O1 and the axis O2 referred to here means the acute angle among the angles formed by the two axes O1 and O2. This angle θ2 is preferably 45° or less. The lower limit of this angle θ2 is, for example, 1°.

[0023] In a cross-section including the axis of the second connection joint 35, the radius of curvature of the inner wall surface 36a on the inner peripheral side of the curved pipe portion 36 is larger than 64 mm and smaller than 125 mm. In this cross-section, it is preferable that the radius of curvature of the outer wall surface 36b on the inner peripheral side of the curved pipe portion 36 is larger than 64 mm and smaller than 125 mm. As shown in FIG. 1, the second connection joint 35 is disposed on the downstream side of the eaves gutter 10. The second end portion of the downspout 30 is inserted into the first connection portion 37.

[0024] The vertical pipe 45 includes a first vertical pipe 46 and a second vertical pipe 47. The vertical pipes 46 and 47 are each formed in a straight tubular shape, and their outer diameters and inner diameters are equal to each other. The inner diameter of the vertical pipes 46 and 47 is 65 mm or more (the nominal diameter of the vertical pipes 46 and 47 is 65 mm or more). The inner diameter of the vertical pipes 46 and 47 is preferably 75 mm or more, and more preferably 98 mm or more. It is also preferable that the inner diameter of the said nominal pipe 30 is the same as the inner diameter of the vertical pipe 45. Note that when the inner diameters of the vertical pipes 46 and 47 increase, there is a risk that the vertical pipe support may not withstand the weight of the stored water when the siphon phenomenon occurs, so it is preferably 160 mm or less. The vertical pipes 46 and 47 each extend along the vertical direction Z. The first vertical pipe 46 is arranged above the second vertical pipe 47. The upper end portion of the first vertical pipe 46 is inserted into the second connection portion 38 of the second connection joint 35. That is, the second connection joint 35 is continuous with the upper end portion of the first vertical pipe 46 (vertical pipe 45). The nominal pipe 30 is connected to the vertical pipe 45 via the second connection joint 35. The second connection portion 38 and the first vertical pipe 46 are held watertightly. The second connection joint 35 connects the nominal pipe 30 and the first vertical pipe 46 (vertical pipe 45).

[0025] The siphon joint 50 is not particularly limited as long as it has a reduced diameter portion. The siphon joint 50 is provided on the vertical pipe 45. Here, the reduced diameter portion means a joint having an inner diameter smaller than the inner diameter of any of the one or more pipe materials to which the siphon joint 50 is directly connected. For example, as shown in FIG. 3, the siphon joint 50 includes an outer cylinder portion 51, an inner cylinder portion 52, a stepped portion 53, and a reduced diameter portion 54.

[0026] The outer cylinder portion 51 and the inner cylinder portion 52 are each formed in a straight tubular shape. The inner diameter of the outer cylinder portion 51 is equal to the outer diameter of the vertical pipes 46 and 47, respectively. The outer diameter of the inner cylinder portion 52 is equal to the inner diameter of the vertical pipes 46 and 47, respectively. The inner cylinder portion 52 is arranged coaxially with the outer cylinder portion 51 inside the outer cylinder portion 51. The outer cylinder portion 51 and the inner cylinder portion 52 are each arranged along the vertical direction Z. The stepped portion 53 is formed in a ring shape. The stepped portion 53 protrudes radially outward from the upper end of the inner cylinder portion 52. The stepped portion 53 is connected to the middle portion in the vertical direction Z of the outer cylinder portion 51. The reduced-diameter portion 54 is formed in a ring shape and is fixed on the stepped portion 53. The inner diameter of the reduced-diameter portion 54 is smaller than the inner diameter of the stepped portion 53 and the inner diameter of the inner cylinder portion 52, respectively.

[0027] The lower end portion of the first vertical pipe 46 is inserted into the upper end portion inside the outer cylinder portion 51. The first vertical pipe 46 and the outer cylinder portion 51 are held in a watertight manner. The upper end portion of the second vertical pipe 47 is disposed between the outer cylinder portion 51 and the inner cylinder portion 52. The outer cylinder portion 51, the inner cylinder portion 52, and the second vertical pipe 47 are held in a watertight manner. As shown in FIG. 1, the length L7 of the vertical pipe 45 located between the second connection joint 35 and the siphon joint 50 is 1 m or more. The length L7 is also the distance between the second connection joint 35 and the siphon joint 50. This length L7 is preferably 1.5 m or more. This length L7 is preferably 4 m or less. This length L7 is more preferably 3 m or less, and most preferably 2.8 m or less. The angle θ4 formed between the axis O3 of the downspout 30 and the axis O4 of the vertical pipe 45 is 45° or less. The angle θ4 formed between the two axes O3 and O4 referred to here means the acute angle among the angles formed between the two axes O3 and O4. For example, the lower limit of this angle θ4 is 1°. For example, the first connection joint 20, the downspout 30, the second connection joint 35, the vertical pipe 45, and the siphon joint 50 are formed by extrusion molding or injection molding of a resin such as vinyl chloride.

[0028] The lower end portion of the second vertical pipe 47 is connected to the ground G. The lower end portion of the second vertical pipe 47 is connected to a known water collection mass (drainage mechanism) 205 buried in the ground. The water collection mass 205 is connected to a drainage structure 207 such as a sewer pipe via a connecting pipe 206.

[0029] According to the rain gutter system 1 of the present embodiment, rainwater that has fallen on the roof 201 of the building 200 flows into the eaves gutter 10. The flow path cross-sectional area S of the eaves gutter 10 is 11000 mm 2 or more, and the inner diameter of the downspout 45 is 65 mm or more. Therefore, the rain gutter system 1 can be used as a large rain gutter system used in a logistics warehouse or the like. Since the siphon joint 50 provided in the downspout 45 has a reduced diameter portion 54, the flow rate of rainwater flowing into the reduced diameter portion 54 is larger than the flow rate of rainwater flowing out from the reduced diameter portion 54 to the downstream side. For this reason, rainwater tends to accumulate in the reduced diameter portion 54. When rainwater accumulates in the reduced diameter portion 54, the downspout 45 (second downspout 47) disposed on the downstream side of the reduced diameter portion 54 becomes full. Then, the rainwater in the reduced diameter portion 54 is pulled by the rainwater in the downspout 45 disposed on the downstream side of the reduced diameter portion 54, and a siphon phenomenon occurs, and the rainwater in the rain gutter system 1 flows downstream vigorously. At this time, the inventors of the present application have found that when the length L7 of the downspout 45 located between the second connection joint 35 and the siphon joint 50 is 1 m or more, the siphon phenomenon can be more reliably generated by the siphon joint 50 having the reduced diameter portion 54, and the siphon phenomenon generated by the siphon joint 50 can be stably transmitted to the upstream portion in the rain gutter system 1. Therefore, even in the large rain gutter system 1 provided with the reduced diameter portion 54, the siphon phenomenon can be more reliably generated, and the generated siphon phenomenon can be stably transmitted to the upstream portion.

[0030] Note that the rainwater drained from the downspout 45 of the rain gutter system 1 flows into the drainage structure 207 via the water collection mass 205 and the connecting pipe 206.

[0031] In a cross section including the axis of the second connection joint 35, the radius of curvature of the inner wall surface 36a is larger than 64 mm and smaller than 125 mm. The rainwater that has flowed into the second connection joint 35 from the first connection portion 37 of the second connection joint 35 does not stagnate on the inner wall surface 36a, and it is difficult for the flow velocity of the rainwater to decrease on the inner wall surface 36a. Therefore, the rainwater that has flowed into the second connection joint 35 can be smoothly flowed toward the second connection portion 38 of the second connection joint 35. The angle θ2 formed by the axis O1 of the first connection part 37 and the axis O2 of the second connection part 38 of the second connection joint 35 is 45° or less. The rainwater flowing into the second connection joint 35 from the first connection part 37 of the second connection joint 35 does not stagnate in the second connection joint 35, and it is difficult for the flow velocity of the rainwater to decrease in the second connection joint 35. Therefore, the rainwater flowing into the second connection joint 35 can be smoothly flowed toward the second connection part 38 of the second connection joint 35.

[0032] The length L6 of the downspout 30 is 3 m or less, and the angle θ4 formed by the axis O3 of the downspout 30 and the axis O4 of the vertical downspout 45 is 45° or less. Therefore, the flow rate of rainwater discharged per unit time from the rain gutter system 1 can be increased.

[0033] In addition, in the present embodiment, it may be configured like the rain gutter system 1A shown in FIG. 4. The rain gutter system 1A includes a first connection joint 55 instead of the first connection joint 20 and the downspout 30 of the rain gutter system 1 of the present embodiment. The first connection joint 55 includes a straight pipe part 56 instead of the second connection part 23 of the first connection joint 20. The outer diameter of the straight pipe part 56 is the same as the outer diameter of the downspout 30. The straight pipe part 56 is formed to have a sufficiently long length before the rain gutter system 1A is constructed, as shown by the two-dot chain line in FIG. 4. In the first connection joint 55, when the specifications of the rain gutter system 1A are determined, the length of the straight pipe part 56 is adjusted at the construction site or the like. Then, the straight pipe part 56 with the adjusted length is inserted into the first connection part 37 of the second connection joint 35.

[0034] Even in the rain gutter system 1A of the modified example configured in this way, the same effects as those of the rain gutter system 1A of the present embodiment can be achieved.

[0035] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 5. The same parts as those in the above embodiment are denoted by the same reference numerals and their description will be omitted, and only the different points will be described. As shown in FIG. 5, the rain gutter system 2 of the present embodiment includes a vertical gutter 45A, an increaser (diameter-expanded part) 60, and a buried underground pipe 65 instead of the vertical gutter 45 in the first embodiment. The vertical gutter 45A includes a third vertical gutter 48 in addition to each component of the vertical gutter 45. The third vertical gutter 48 is disposed below the second vertical gutter 47. The inner diameter of the third vertical gutter 48 is larger than the inner diameter of the second vertical gutter 47.

[0036] The increaser 60 is a so-called diameter-expanding joint. For example, the inner diameter of the lower end portion of the increaser 60 is larger than the inner diameter of the upper end portion of the increaser 60. The upper end portion of the increaser 60 is connected to the lower end portion of the second vertical gutter 47. The lower end portion of the increaser 60 is connected to the upper end portion of the third vertical gutter 48.

[0037] The buried underground pipe 65 is connected to the lower end portion of the third vertical gutter 48 (the downstream end portion in the vertical gutter 45A). The buried underground pipe 65 is a pipe buried in the ground. The buried underground pipe 65 includes a first elbow 66, a connecting pipe 67, and a second elbow 68. The connecting pipe 67 is disposed in the ground along a horizontal plane. The first elbow 66 connects the lower end portion of the third vertical gutter 48 and the first end portion of the connecting pipe 67. The second elbow 68 is connected to the second end portion of the connecting pipe 67. The end portion of the second elbow 68 opposite to the end portion connected to the connecting pipe 67 faces downward. The second end portion of the connecting pipe 67 and the second elbow 68 are disposed in a rainwater mass 69 buried in the ground. The increaser 60 is provided between the siphon joint 50 and the buried underground pipe 65 in the vertical gutter 45A. A pipe 70 is connected to the rainwater mass 69.

[0038] In the rain gutter system 2 configured as described above, even in a large rain gutter system provided with the reduced-diameter portion 54, the siphon phenomenon can be more reliably generated, and the generated siphon phenomenon can be stably transmitted to the upstream portion. Furthermore, since rainwater becomes negative pressure within the increaser 60, the flow rate of rainwater in the portion of the vertical gutter 45A upstream of the increaser 60 can be further increased. Therefore, the flow rate of rainwater flowing through the rain gutter system 2 can be further increased. Note that the rainwater drained from the vertical gutter 45A of the rain gutter system 2 flows into the rainwater mass 69 through the underground buried pipe 65. Then, it is discharged to the outside of the system of the rain gutter system 2 through the pipe 70.

[0039] As described above, the first and second embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc. of the configuration within the scope not departing from the gist of the present invention are also included. Needless to say, the configurations shown in each embodiment can be used in appropriate combinations. In the cross-section including the axis of the second connection joint 35, the radius of curvature of the inner wall surface of the second connection joint 35 may be 64 mm or less, or may be 125 mm or more. The angle θ2 of the second connection joint may exceed 45°. Assume that the vertical gutter 45 is divided into the first vertical gutter 46, the second vertical gutter 47, etc. However, the vertical gutter may be integrally configured as a single vertical gutter. The angle θ4 formed by the axis O3 of the downspout 30 and the axis O4 of the vertical gutter 45 may exceed 45°. The rain gutter systems 1 and 2 may not include the first connection joint 20 and the downspout 30.

[0040] As in the first modification shown in FIG. 6, the reduced-diameter portion 54 of the siphon joint 50A may be integrated with the stepped portion 53. In this siphon joint 50A, the inner cylinder portion 52 is not provided. In other words, the siphon joint 50A is formed by the outer cylinder portion 51 and the stepped portion 53, and the stepped portion 53 serves as the reduced-diameter portion 54. In this modification, the stepped portion 53 (reduced-diameter portion 54) is an annular protrusion.

[0041] Here, in order to store rainwater upstream of the reduced-diameter portion 54 of the siphon joint 50A, the load increases due to the stored rainwater. In particular, when the inner diameter of the vertical drainpipe 45 is 98 mm or more and the wall thickness of the vertical drainpipe 45 is thin, the vertical drainpipe may be damaged due to the load of the stored rainwater. Therefore, when the inner diameter of the vertical drainpipe 45 is 98 mm or more, the wall thickness of the vertical drainpipe 45 is preferably at least 3 mm or more. Here, when the wall thickness of the vertical drainpipe 45 is 5 mm or less, since the inner diameter of the vertical drainpipe is large and it is difficult to reach a full-flow state where the siphon phenomenon occurs, it is desirable to increase the protruding height at the reduced-diameter portion 54 of the siphon joint 50A to facilitate rainwater storage. Therefore, the protruding height L of the reduced-diameter portion 54 from the inner surface of the vertical drainpipe 47 shown in FIG. 7 is preferably 3.5 mm or more and 6 mm or less, and more preferably 4.0 mm or more and 5.5 mm or less. When the protruding height L is less than 3.5 mm, there is a possibility that it is difficult to reach a full-flow state due to the large inner diameter, and the siphon phenomenon is less likely to occur. On the other hand, when the protruding height L exceeds 6 mm, there is a possibility that the flow rate will decrease.

[0042] On the other hand, when the inner diameter of the vertical drainpipe 45 is 98 mm or more and the wall thickness of the vertical drainpipe 45 is large, although the siphon phenomenon is likely to occur due to the reduced-diameter portion 54 because the inner diameter is small, the flow rate is likely to decrease. Therefore, when the wall thickness of the vertical drainpipe 45 is greater than 6.5 mm, the protruding height L of the reduced-diameter portion 54 from the inner surface of the vertical drainpipe 47 shown in FIG. 7 is preferably 0.4 mm or more and 2.0 mm or less, more preferably 0.6 mm or more and 2.0 mm or less, and even more preferably 1.1 mm or more and 2.0 mm or less. When the protruding height L is less than 0.4 mm, there is a possibility that the siphon phenomenon is less likely to occur. On the other hand, when the protruding height L exceeds 2.0 m, there is a possibility that the flow rate will decrease.

[0043] As in the second modified example shown in FIG. 8, in the siphon joint 50B, a confluence portion 57 may be provided on the downstream side with respect to the stepped portion 53 (reduced-diameter portion 54). Similar to the case of the first modification, when the inner diameter of the vertical gutter is 98 mm or more and the wall thickness of the vertical gutter is 5 mm or less, the protruding height L of the reduced-diameter portion 54 from the inner surface of the vertical gutter 47 shown in FIG. 9 is preferably 3.5 mm or more and 6 mm or less, and more preferably 4.0 mm or more and 5.5 mm or less. On the other hand, when the inner diameter of the vertical gutter is 98 mm or more and the wall thickness of the vertical gutter is 6.5 mm or more, the protruding height L of the reduced-diameter portion 54 is preferably 0.4 mm or more and 2.0 mm or less, more preferably 0.6 mm or more and 2.0 mm or less, and even more preferably 1.1 mm or more and 2.0 mm or less.

[0044] As shown in the third modification example of FIG. 10, a drain joint 700 that connects the opening 11b (drop opening) of the eaves gutter 10 and the joint 20 according to the embodiment of the present invention may be provided. Further, a siphon generating member 7 may be provided in the drain joint 700. Thereby, even when rainwater flows into the eaves gutter during heavy rain, a siphon phenomenon occurs and it has a high drainage capacity. The siphon generating member 7 may be, for example, an injection molded product of a synthetic resin such as rigid vinyl chloride resin, polycarbonate, ABS, or AES. Further, the siphon generating member 7 may be made of cast iron using a mold.

[0045] The siphon generating member 7 may have a drop opening portion 72, ribs 71, or a lid member 73. The drop opening portion 72 protrudes downward from the eaves gutter 10. The ribs 71 extend upward from the bottom surface 11a of the eaves gutter 10. A plurality of ribs 71 are provided at intervals in the circumferential direction of the drop opening portion 72. When the lid member 73 is provided, it is supported from below by the plurality of ribs 71. The lid member 73 covers the drop opening portion 72 from above. In the siphon generating member 7, rainwater flows into the drop opening portion 72 through the gap between the lid member 73 and the ribs 71. A through hole may be provided in the lid member 73.

[0046] The opening area of the drop opening portion 72 is 30 cm 2 or more and 190 cm 2 or less. When the opening area of the drop opening portion 72 is less than 30 cm 2 , there is a risk that the large-flow drainage generated by the siphon generating member 7 cannot be drained smoothly. On the other hand, when the opening area of the drop opening portion 72 is 190 cm 2In the case of exceeding the limit, the fit becomes larger, which may lead to an increase in the size of the drain joint 700 and the support tool for supporting the eaves gutter 10.

[0047] By setting the position of the lid member 73 of the siphon generating member 7 so that the height from the bottom surface 11a of the eaves gutter 10 is 10 to 50 mm, even when a large amount of rainwater flows in from the opening during heavy rain, the siphon generating member 7 becomes full of water and is sealed without sucking in air. Therefore, since the siphon phenomenon can be generated at the drain port 72, excellent drainage performance can be obtained.

[0048] (Example) Hereinafter, the embodiments and comparative examples of the present invention will be specifically shown and described in more detail, but the present invention is not limited to the following embodiments. In the following embodiments and comparative examples, the flow path cross-sectional area S of the eaves gutter 10 is 11000 mm 2 or more, and the nominal diameter of the downspout 45 is 75 (the inner diameter of the downspout 45 is 78 mm or 84 mm). (Example 1) As shown in Specification Nos. 1 to 4 in Table 1, the length L7 of the downspout 45 located between the second connection joint 35 and the siphon joint 50 was changed. Then, the flow rate of rainwater at the opening 11b (drain port) of the eaves gutter 10 was measured.

[0049] [Table 1]

[0050] In Specification No. 1, the length L7 of the downspout 45 was 3 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was 20 L / s (liters per second). In this case, since the siphon phenomenon occurred, there was no overflow of rainwater from the eaves gutter 10. In Specification No. 2, the length L7 of the downspout 45 was 2 m, and the flow rate of rainwater at the opening 11b of the eaves gutter 10 was 15 L / s. In this case, since the siphon phenomenon occurred, there was no overflow of rainwater from the eaves gutter 10. In Specification No. 3, the length L7 of the vertical gutter 45 was set to 1.2 m, and the rainwater flow rate at the opening 11b of the eaves gutter 10 was set to 10 L / s. In this case, since the siphon phenomenon occurred, there was no overflow of rainwater from the eaves gutter 10. And in Specification No. 4, the length L7 of the vertical gutter 45 was set to 0.8 m, and the rainwater flow rate at the opening 11b of the eaves gutter 10 was set to 7 L / s. In this case, since the siphon phenomenon was blocked, rainwater overflowed from the eaves gutter 10. In Example 1, it was found that Specifications No. 1 to No. 3 became examples, and Specification No. 4 became a comparative example.

[0051] (Example 2) As in Specifications No. 6 to No. 10 shown in Table 2, the angle θ4 formed by the axis O3 of the downspout 30 and the axis O4 of the vertical gutter 45, and the length L6 of the downspout 30 were changed. Then, the rainwater flow rate was measured.

[0052]

Table 2

[0053] In Specification No. 6, the angle θ4 was set to 45°, and the length L6 of the downspout 30 was set to 1 m. In this case, the rainwater flow rate was 20 L / s. In Specification No. 7, the angle θ4 was set to 25°, and the length L6 of the downspout 30 was set to 1 m. In this case, the rainwater flow rate was 23 L / s. In Specification No. 8, the angle θ4 was set to 45°, and the length L6 of the downspout 30 was set to 2 m. In this case, the rainwater flow rate was 12 L / s. In Specification No. 9, the angle θ4 was set to 45°, and the length L6 of the downspout 30 was set to 3 m. In this case, the rainwater flow rate was 10 L / s. And in Specification No. 10, the angle θ4 was set to 45°, and the length L6 of the downspout 30 was set to 4 m. In this case, the rainwater flow rate was 5 L / s. In Example 2, the siphon phenomenon occurred in Specifications No. 6 to No. 10, and there was no overflow of rainwater from the eaves gutter 10. For this reason, it was found that Specifications No. 6 to No. 10 became examples.

[0054] (Example 3) As shown in Specification Nos. 11 to 19 in Table 3, the wall thickness of the vertical gutter 45 and the length of the step L of the reduced-diameter portion of the siphon joint 54 were changed. Then, the occurrence of the siphon phenomenon and the presence or absence of overflow from the eaves gutter 10 upstream of the siphon joint 54 were measured.

[0055]

Table 3

[0056] In Example 3, the siphon phenomenon occurred in Specification Nos. 11 to 15, and there was no overflow of rainwater from the eaves gutter 10. On the other hand, in Specifications 16 and 18, the siphon phenomenon was less likely to occur and overflow from the eaves gutter 10 occurred. Also, in Specifications 17 and 19, although the siphon phenomenon occurred, the flow rate was small and overflow from the eaves gutter 10 occurred. For this reason, it was found that Specification Nos. 11 to 15 became the examples.

Explanation of Signs

[0057] 1, 1A, 2 Rain gutter system 10 Eaves gutter 30 Downspout 35 Second connection joint (connection joint) 36a Inner wall surface 45, 45A Vertical gutter 50 Siphon joint 54 Reduced-diameter portion 60 Increaser (enlarged-diameter portion) 65 Buried underground pipe L6, L7 Length O1, O2, O3, O4 Axis S Flow path cross-sectional area θ2, θ4 Angle

Claims

1. A gutter system comprising: an eaves gutter; a downspout; a connection joint arranged downstream of the eaves gutter and connected to an upper end of the downspout; and a siphon joint having a reduced diameter portion and provided on the downspout, The cross-sectional area of ​​the eaves gutter is 11,000 mm ２ That's all. The inner diameter of the downspout is 65 mm or more, A gutter system, wherein the length of the downspout located between the connection joint and the siphon joint is 1 m or more.

2. The gutter system according to claim 1 , wherein a radius of curvature of an inner wall surface on an inner periphery side of the connection joint is greater than 64 mm and smaller than 125 mm in a cross section including an axis of the connection joint.

3. The gutter system according to claim 1 or 2, wherein an angle between axes of the connection parts provided at both ends of the connection joint is 45° or less.

4. A call gutter is connected to the downstream side of the eaves gutter and is connected to the downspout, The length of the said call gutter is 3m or less, The gutter system according to any one of claims 1 to 3, wherein an angle between the axis of the downspout and the axis of the downspout is 45° or less.

5. An underground buried pipe connected to the downstream end of the downspout; An expanded diameter portion provided in the downspout between the siphon joint and the underground buried pipe; The gutter system according to any one of claims 1 to 4, comprising:

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