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 vertical gutter, 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 for houses and the like. On the other hand, a large rain gutter system used for 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 vertical gutter 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 thereof is to provide a rain gutter system that can more surely cause a siphon phenomenon and stably transmit the generated siphon phenomenon to the upstream portion even in a large rain gutter system having 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. The rain gutter system is characterized in that the cross-sectional area of the flow path 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 cross-sectional area of the flow path 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 cross-sectional area of the flow path 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-scale 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 reduced diameter portion to the downstream side. 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 of water. 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 surely 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-scale rain gutter system provided with a reduced diameter portion, the siphon phenomenon can be more surely generated, and the generated siphon phenomenon can be stably transmitted to the upstream portion.

[0008] In addition, 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. Therefore, 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] In addition, 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 acute angle among the angles formed by 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. Therefore, the rainwater flowing into the connection joint can be smoothly flowed toward the other connection portion of the connection joint.

[0010] In addition, in the rain gutter system, it includes a downspout connected to the downstream side of the eaves gutter and connected to the vertical gutter, 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 acute angle among the angles formed by the two axes. According to this invention, the flow rate of rainwater discharged from the rain gutter system per unit time can be increased.

[0011] In addition, in the rain gutter system, it may include a buried underground pipe connected to the downstream end of the vertical gutter and a diameter-expanded portion provided between the siphon joint and the buried underground pipe in the vertical gutter. According to the present invention, by making rainwater negative pressure inside 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.

Effects 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

Modes for Carrying Out the Invention

[0014] (First Embodiment) Hereinafter, a first embodiment of a 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 eaves 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 inclined so as to gradually face 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 inclined so as to gradually face 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 in this example is a so-called front-high gutter. The first side wall 12 is arranged on the first side of the second direction Y with respect to the end 201a of the roof 201 when viewed in the vertical direction Z. The second side wall 13 is arranged on the second side of the second direction Y with respect to 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 within 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 enclosed 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 in which the position of the upper end of the first side wall in the vertical direction Z is equal to the position of the upper end of the second side wall in the vertical direction Z. When the eaves gutter is a parallel gutter, the flow path cross-sectional area S means the area enclosed by the bottom wall, the first side wall, the second side wall, and the reference line along the horizontal plane passing through the upper ends of the respective side walls.

[0019] The first connection joint 20 includes a curved pipe portion 21, a first connection portion 22, and a second connection 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 portion 22 is arranged at the first end in the axial direction of the curved pipe portion 21. The first connection portion 22 is connected to the peripheral edge 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 curved 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 curved pipe part 21. In addition, 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 where rainwater flows in the eaves gutter 10. 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 such that it 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 curved 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 part 36 is about 45°. The first connection part 37 is a receiving port. The inner diameter of the first connection part 37 is larger than the inner diameter of the curved pipe part 36. A first step part 39 that protrudes radially inward from the first connection part 37 and reaches the curved pipe part 36 is formed at the connection part between the curved pipe part 36 and the first connection part 37.

[0022] The second connecting portion 38 is a receiving port. The inner diameter of the second connecting portion 38 is larger than the inner diameter of the curved pipe portion 36. At the connecting portion between the curved pipe portion 36 and the second connecting portion 38, a second stepped portion 40 is formed which projects radially inward from the second connecting portion 38 and reaches the curved pipe portion 36. The first connecting portion 37 and the second connecting portion 38 are provided at both ends of the second connecting joint 35. The angle θ2 formed between the axis O1 of the first connecting portion 37 and the axis O2 of the second connecting portion 38 is approximately 45° (45°). The angle θ2 formed between the axis O1 and the axis O2 referred to here means the smaller 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 connecting 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 connecting 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 connecting 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. The inner diameter of the downspout 30 is also preferably the same as the inner diameter of the vertical pipe 45. The vertical pipes 46 and 47 each extend along the vertical direction Z. The first vertical pipe 46 is disposed above the second vertical pipe 47. The upper end portion of the first vertical pipe 46 is inserted into the second connecting portion 38 of the second connecting joint 35. That is, the second connecting joint 35 is continuous with the upper end portion of the first vertical pipe 46 (vertical pipe 45). The downspout 30 is connected to the vertical pipe 45 via the second connecting joint 35. The second connection part 38 and the first vertical pipe 46 are kept watertight. The second connection joint 35 connects the downspout 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 part. The siphon joint 50 is provided on the vertical pipe 45. Here, the reduced diameter part means a joint having an inner diameter smaller than the inner diameter of any one 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 part 51, an inner cylinder part 52, a stepped part 53, and a reduced diameter part 54.

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

[0027] The lower end part of the first vertical pipe 46 is inserted into the upper end part of the outer cylinder part 51. The first vertical pipe 46 and the outer cylinder part 51 are kept watertight. The upper end part of the second vertical pipe 47 is arranged between the outer cylinder part 51 and the inner cylinder part 52. The outer cylinder part 51, the inner cylinder part 52, and the second vertical pipe 47 are kept watertight. As shown in Fig. 1, the length L7 of the vertical downspout 45 located between the second connecting joint 35 and the siphon joint 50 is 1 m or more. The length L7 is also the distance between the second connecting 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 by the axis O3 of the downspout 30 and the axis O4 of the vertical downspout 45 is 45° or less. The angle θ4 formed by the two axes O3 and O4 mentioned here means the acute angle among the angles formed by the two axes O3 and O4. For example, the lower limit of this angle θ4 is 1°. For example, the first connecting joint 20, the downspout 30, the second connecting joint 35, the vertical downspout 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 of the second vertical downspout 47 is connected to the ground G. The lower end of the second vertical downspout 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 channel cross-sectional area S of the eaves gutter 10 is 11000 mm 2 or more, and the inner diameter of the vertical 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 vertical 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. Therefore, rainwater easily accumulates in the reduced diameter portion 54. When rainwater accumulates in the reduced diameter portion 54, the vertical downspout 45 (second vertical downspout 47) arranged 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 vertical downspout 45 arranged 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 found that when 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 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] The rainwater drained from the vertical pipe 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 flowing 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 flowing 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 portion 37 and the axis O2 of the second connection portion 38 of the second connection joint 35 is 45° or less. The rainwater flowing into the second connection joint 35 from the first connection portion 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 portion 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 pipe 45 is 45° or less. Therefore, the amount of rainwater discharged per unit time from the rain gutter system 1 can be increased.

[0033] In addition, in this embodiment, it may be configured as a 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 this embodiment. The first connection joint 55 includes a straight pipe portion 56 instead of the second connection portion 23 of the first connection joint 20. The outer diameter of the straight pipe portion 56 is the same as the outer diameter of the downspout 30. The straight pipe portion 56 is formed to have a sufficiently long length before constructing the rain gutter system 1A, 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 portion 56 is adjusted at the construction site or the like. Then, the straight pipe portion 56 with the adjusted length is inserted into the first connection portion 37 of the second connection joint 35.

[0034] Even in the modified rain gutter system 1A configured as described above, the same effects as those of the rain gutter system 1A of this 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 descriptions are omitted, and only the different points will be described. As shown in FIG. 5, the rain gutter system 2 of this embodiment includes a downspout 45A, an increaser (diameter-expanding portion) 60, and an underground buried pipe 65 instead of the downspout 45 of the first embodiment. The downspout 45A includes a third downspout 48 in addition to each component of the downspout 45. The third downspout 48 is disposed below the second downspout 47. The inner diameter of the third downspout 48 is larger than the inner diameter of the second downspout 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 downspout 47. The lower end portion of the increaser 60 is connected to the upper end portion of the third downspout 48.

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

[0038] A siphon joint 50 is provided in the middle of the vertical pipe 45A, and rainwater flows into the underground buried pipe 65 at a large flow rate and flow velocity due to the generated siphon phenomenon. Therefore, the inner surface of the first elbow 66 preferably has a smooth shape, and the third vertical pipe 48 and the underground buried pipe 65 preferably have a larger nominal diameter than the second vertical pipe 47. The nominal diameters of the third vertical pipe 48 and the underground buried pipe 65 are preferably one size larger than the nominal diameter of the second vertical pipe 47, and more preferably two sizes larger. Specifically, for the third vertical pipe 48 and the underground buried pipe 65, pipes and joints with a nominal diameter of 75A to 200A defined by the symbol VP or VU in JIS K6741 are used. Therefore, when the second vertical pipe 47 is 75A, the third vertical pipe 48 and the underground buried pipe 65 are preferably 100A or more, and when the third vertical pipe 48 is 100A, the underground buried pipe 65 preferably uses a pipe joint of 125A or more. Also, the underground buried pipe 65 may have a larger nominal diameter than the third vertical pipe 48, thereby suppressing the overflow of rainwater from the rainwater sump 69 and the joint between the second vertical pipe 47 and the third vertical pipe 48.

[0039] In the gutter system 2 configured as described above, even in a large 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, by the rainwater becoming negative pressure within the increaser 60, the flow rate of the rainwater in the portion upstream of the increaser 60 in the downspout 45A can be further increased. Therefore, the flow rate of the rainwater flowing through the gutter system 2 can be further increased. Note that the rainwater drained from the downspout 45A of the gutter system 2 flows into the rainwater mass 69 through the underground buried pipe 65. Then, it is discharged outside the system of the gutter system 2 through the pipe 70.

[0040] 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 appropriately combined and used. 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 downspout 45 is divided into the first downspout 46, the second downspout 47, etc. However, the downspout may be integrally configured as a single downspout. The angle θ4 formed by the axis O3 of the leader gutter 30 and the axis O4 of the downspout 45 may exceed 45°. The gutter systems 1 and 2 may not include the first connection joint 20 and the leader gutter 30.

[0041] In addition, as in the first modification example shown in FIG. 6, the diameter-expanded portion 60 may be a drain pipe cover 60A instead of the increaser. The drain pipe cover 60A is provided between the underground buried pipe 65 and the third vertical pipe 48. The drain pipe cover 60A includes a cylindrical portion 60A1 and a flange portion 60A2. The lower end of the second vertical pipe 47 is disposed inside the upper end of the cylindrical portion 60A1. The lower end of the cylindrical portion 60A1 is disposed inside the upper end of the third vertical pipe. The cylindrical portion 60A1 is fitted inside the flange portion 60A2. The flange portion 60A2 covers the third vertical pipe from above. The flange portion 60A2 is supported by the ground surface G. In addition, the radius of curvature R1 of the inner surface of the first elbow 66 is preferably 100 mm or more, more preferably 110 mm or more, and even more preferably 125 mm or more. The radius of curvature R1 is the radius of curvature when the first elbow 66 is viewed in a plane including both the axis of the vertical pipe 45A and the axis of the connecting pipe 67. (Example) Hereinafter, examples 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 examples. In addition, in the following examples 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 vertical pipe 45 is 75 (the inner diameter of the vertical pipe 45 is 78 mm or 84 mm). (Example 1) As in Specification Nos. 1 to 4 shown in Table 1, the length L7 of the vertical pipe 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 (downspout) of the eaves gutter 10 was measured.

[0042]

Table 1

[0043] In Specification No. 1, the length L7 of the vertical pipe 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 vertical downspout 45 was set to 2 m, and the rainwater flow rate at the opening 11b of the eaves gutter 10 was set to 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 downspout 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. Then, in Specification No. 4, the length L7 of the vertical downspout 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.

[0044] (Example 2) As in Specifications No. 6 to No. 10 shown in Table 2, the angle θ4 formed by the axis O3 of the leader gutter 30 and the axis O4 of the vertical downspout 45, and the length L6 of the leader gutter 30 were changed. Then, the rainwater flow rate was measured.

[0045]

Table 2

[0046] In Specification No. 6, the angle θ4 was set to 45°, and the length L6 of the leader gutter 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 leader gutter 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 leader gutter 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 leader gutter 30 was set to 3 m. In this case, the rainwater flow rate was 10 L / s. Then, in Specification No. 10, the angle θ4 was set to 45°, and the length L6 of the leader gutter 30 was set to 4 m. In this case, the rainwater flow rate was 5 L / s. In Example 2, the siphon phenomenon occurred from Specification No. 6 to Specification No. 10, and there was no overflow of rainwater from the eaves gutter 10. Therefore, it was found that Specifications No. 6 to No. 10 were the examples.

Explanation of Signs

[0047] 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 part 60 Increaser (enlarged diameter part) 65 Underground buried 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; 5. The gutter system according to claim 1, further comprising:

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