Rainwater drainage system

Abstract

To provide a rainwater drainage system easy to maintain.SOLUTION: A rainwater drainage system 100 includes: an inlet 220 for rainwater to flow in; a horizontal pipe 110 connected to the inlet 220; and a vertical pipe 120 connected to the horizontal pipe 110. The vertical pipe 120 is provided with a first joint 10 and a second joint 20. The first fitting 10 has a cleaning port 36a, and the second fitting 20 has a reduced section. The second joint 20 is located within 1000 mm of the cleaning port 36a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a stormwater drainage system. [Background technology]

[0002] The rainwater drainage system of Patent Document 1 is a large-scale rainwater drainage system that is provided with a diameter-reducing section to generate a siphon effect. It is known that siphoning occurs in rainwater drainage systems that have a narrowed section in the downspout. In this rainwater drainage system, rainwater (water) accumulates in the narrowed section. Gravity acts on the accumulated rainwater, causing the siphoning. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-124005 Summary of the Invention [Problem to be solved by the invention]

[0004] However, a problem with rainwater drainage systems having a reduced diameter section is that contaminants such as garbage contained in rainwater tend to accumulate in the reduced diameter section.

[0005] The present invention has been made in consideration of such problems, and has an object to provide a rainwater drainage system that is easy to maintain. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means.

[0007] (1) The rainwater drainage system of the present invention has an inlet through which rainwater flows in, a horizontal pipe connected to the inlet, and a vertical pipe connected to the horizontal pipe, and the vertical pipe is provided with a first joint and a second joint, a cleaning port is provided in the first joint, a reduction section is provided in the second joint, and the second joint is provided within 1000 mm of the cleaning port. With this configuration, the vertical pipe has a cleaning port and a reduced section. This allows the reduced section, which is particularly prone to accumulating dirt, to be cleaned through the cleaning port. In addition, since the reduced section is located within 1000 mm of the cleaning port, it is easy to access the reduced section from the cleaning port. This makes maintenance easier. (2) The first joint may connect the vertical pipe and the horizontal pipe. The vertical pipe and horizontal pipe are usually connected with an elbow, but by connecting them using the first joint, it can be used as a cleaning port, making maintenance easier. Furthermore, with this configuration, a cleaning port can be provided at the connection between the vertical pipe and horizontal pipe, reducing costs. (3) The first joint may be located within 1500 mm from the floor of the building. With this configuration, for example, it becomes easy for an operator to clean the inside of the pipe through the cleaning port while standing, thereby facilitating maintenance. (4) The first joint may be provided upstream of the second joint. Dust tends to accumulate particularly on the upstream side of the reduction section. With this configuration, it becomes easy to clean out the dust that has accumulated on the upstream side of the reduction section, thereby facilitating maintenance. [Effects of the Invention]

[0008] The present invention can provide a stormwater drainage system that is easy to maintain. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a building in which the storm water drainage system of the present invention is installed. [Figure 2] 1 is a side view showing a first embodiment of a storm water drainage system according to the present invention. [Figure 3] FIG. 2 is a side view showing a second embodiment of the storm water drainage system of the present invention. [Figure 4] FIG. 2 is a side view showing a third embodiment of the storm water drainage system of the present invention. [Figure 5] FIG. 3 is a cross-sectional view of the first joint of the present invention with the cover removed. [Figure 6] FIG. 3 is a cross-sectional view of the first joint of the present invention with the cover attached. [Figure 7] FIG. 10 is a cross-sectional view of a modified first joint of the present invention with a cover attached. [Figure 8] FIG. 4 is an enlarged cross-sectional view of a second joint provided in the storm water drainage system of the present invention. [Figure 9] FIG. 10 is an enlarged cross-sectional view of a second joint of the second embodiment. [Figure 10] FIG. 11 is an enlarged cross-sectional view of a second joint of the third embodiment. [Figure 11] 1 is a schematic diagram showing a stormwater drainage system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] A stormwater drainage system 100 according to the present invention will now be described with reference to FIGS. 1 to 11. FIG.

[0011] As shown in FIG. 1, the storm water drainage system 100 is installed in a building 200 . 1 is a three-story building, with floors 210 provided between the first and second floors and between the second and third floors. However, the building 200 does not have to be three stories tall.

[0012] The stormwater drainage system 100 moves rainwater that falls on the building 200 to the vicinity of the ground and drains it into a sewer pipe. The building 200 may be provided with one stormwater drainage system 100, or may be provided with two or more stormwater drainage systems 100. When two stormwater drainage systems 100 are provided, the two stormwater drainage systems 100 may be arranged near opposite sides of the building 200.

[0013] The inlet 220 is provided to drain rainwater that has fallen on the building 200 into the stormwater drainage system 100. In the illustrated example, the inlet 220 is provided on the roof of the building 200, but the location of the inlet 220 is not limited thereto, and the inlet 220 may be provided somewhere other than the roof, or may be provided both on the roof and somewhere other than the roof.

[0014] 1, the drain outlet 230 is connected to the most downstream side of the storm water drainage system 100, and drains the storm water collected via the inlet 220 into a sewer pipe. The drain outlet 230 opens, for example, into a manhole buried underground.

[0015] (Rainwater drainage system 100) FIG. 2 shows a storm water drainage system 100 according to this embodiment. 2, the rainwater drainage system 100 in this embodiment has a horizontal pipe 110 and a vertical pipe 120. The rainwater drainage system 100 is installed inside a building 200. Furthermore, the stormwater drainage system 100 may be configured with only the standpipe 120.

[0016] The riser pipes 120 are arranged downward from each of the multiple inlets 220. The riser pipes 120 are arranged along a substantially vertical direction (which can also be said to be an up-down direction). The upper end of the riser pipe 120 is connected to, for example, the inlet 220. The lower end of the riser pipe 120 is connected to, for example, the horizontal pipe 110. The lower end of the riser pipe 120 is located, for example, in a pipe space. The lower end of the riser pipe 120 is located, for example, above a panel (ceiling panel). The lower end of the riser pipe 120 is connected to the horizontal pipe 110 via, for example, an elbow, a tee, or the like.

[0017] The standpipe 120 is arranged in the vertical direction. The standpipe 120 may be offset at intermediate floors and include a horizontal section. The upper end of the standpipe 120 is connected to the horizontal section 110. Rainwater that passes through the standpipe 120 is discharged to the outside of the building 200 through a drain outlet 230 (not shown). The rainwater discharged to the outside of the building 200 is discharged into a sewer pipe through a stormwater manhole (not shown). A rainwater storage tank (not shown) may be connected to the drain outlet 230. The riser 120 has a pipe 2. The riser 120 may have one or more pipes 2. There is no limitation on the method for connecting the pipes 2 to each other.

[0018] The horizontal pull pipe 110 is arranged along the horizontal direction and is connected to the lower end or upper end of the piping 2 of the vertical pipe 120. The horizontal pull pipe 110 is located in the pipe space. The horizontal pull pipe 110 is arranged so that the end on the vertical pipe 120 side is horizontal with or lower than the opposite end. The horizontal drawing pipe 110 has a pipe 2. The horizontal drawing pipe 110 may have one pipe 2 or may have a plurality of pipes 2. There is no limitation on the method for connecting the pipes 2 to each other.

[0019] In this embodiment, the standpipe 120 comprises a first fitting 10 having a cleaning port 36a and a second fitting 20 having a reduced portion 28.

[0020] The inlet 220 is connected to the horizontal pipe 110 via a bend 4 (elbow). The horizontal pipe 110 is connected to the vertical pipe 120 via a first joint 10, which is a Y-tee. In this embodiment, the second joint 20 is disposed downstream of the first joint 10.

[0021] As in the rainwater drainage system 100A shown in FIG. 2, the horizontal pipe 110 and the vertical pipe 120 may be connected by a first joint 10. More specifically, the inlet 220 is connected to the bent portion 4 (elbow), the bent portion 4 is connected to the end of the horizontal pull pipe 110, and the first connecting portion 37 of the first joint 10 is connected to the other end of the horizontal pull pipe 110. The second connecting portion 38 of the first joint 10 is connected to the upper end of the standpipe 120. The extension pipe 36 of the first joint 10 extends vertically. The lid 32 faces upward. The second joint 20 is connected to the standpipe 120 downstream of the second connecting portion 38 of the first joint 10. In this rainwater drainage system 100A, the standpipe 120 and the reduced portion 28 of the second joint 20 in particular can be easily cleaned from above the standpipe 120.

[0022] As in a modified rainwater drainage system 100B shown in FIG. 3, a lid 66 may be provided instead of the lid 32 in the first joint 10B of the first modified example. The lid 66 and the joint body 31 constitute the first joint 10B. The insertion portion 67 of the lid 66 blocks at least a portion of the internal space of the extension pipe 36. The insertion portion 67 does not block the internal space of the bent pipe portion 35. The outer surface of the bottom wall portion 69 is formed to fit along the inner circumferential surface of the bent pipe portion 35. In the rainwater drainage system 100B of the second modified example configured in this manner, it is possible to prevent the flow of rainwater that has flowed into the bent pipe section 35 from being obstructed by the insertion section 67. Furthermore, because the insertion section 67 blocks at least a portion of the internal space of the extension pipe 36, it is possible to prevent the rainwater from flowing in places other than the internal space of the bent pipe section 35, causing the rainwater to swirl in those parts or to generate turbulence in the rainwater, thereby preventing the siphoning of the rainwater.

[0023] The first joint 10 does not have to be connected to the horizontal pipe 110. As in a modified rainwater drainage system 100C shown in FIG. 4, the first joint 10 may be arranged, for example, between the pipes 2 that make up the standpipe 120. In the example shown in FIG. 4, the second joint 20 is arranged at the compartment penetration part 211. The modified example shown in FIG. 4 has a first joint 10 connected to the downstream side of the pipe 2 that makes up the standpipe 120, and a second joint 20 connected further downstream. The first joint 10 and the second joint 20 may be directly connected.

[0024] From the viewpoint of workability, it is preferable that the vertical length L1 from the first fitting 10 to the floor 210 of the building 200 be 1500 mm or less, as shown in FIG. 4. Here, the vertical length L1 from the first fitting 10 to the floor 210 refers to the vertical length from point A, which is the lowest point of the opening of the cleaning port 36a of the first fitting 10, to the surface of the floor 210. More specifically, for example, when the cleaning port 36a is horizontally disposed as shown in FIGS. 2 and 3, all positions of the opening of the cleaning port 36a are at the same height, so the vertical length L1 refers to the vertical length from the opening of the cleaning port 36a to the surface of the floor 210. However, for example, when the opening of the cleaning port 36a is not horizontally disposed as shown in FIG. 4, the length L1 refers to the length from point A, which is the lowest point of the opening of the cleaning port 36a, to the surface of the floor 210. If the length L1 is 1500 mm or less, it becomes easy for workers to clean the inside of the piping 2 from the cleaning port 36a. Similarly, from the viewpoint of workability, it is preferable that the vertical length L2 between the cleaning port 36a of the first fitting 10 and the second fitting 20 be 1000 mm or less, as shown in Figures 2, 3, and 9. Here, the vertical length L2 between the cleaning port 36a of the first fitting 10 and the second fitting 20 refers to the vertical length from point A, which is the lowest point of the opening of the cleaning port 36a of the first fitting 10, to the start point B of the contracted portion 28 of the second fitting 20. If the length L2 is 1000 mm or less, it will be easy for an operator to clean out debris accumulated in the contracted portion 28 of the second fitting 20 from the cleaning port 36a.

[0025] (First joint 10) The first joint 10 has a cleaning port 36a. Of the two branches of the first joint 10, one having a cleaning port 36a is referred to as a branch pipe 33, and the other is referred to as a main pipe . In the example shown in Figures 2 and 3, the branch pipe 33 is arranged coaxially with the vertical pipe 120, but the arrangement of the branch pipe 33 is not limited to this. For example, if the first joint 10 is arranged midway along the vertical pipe 120, the branch pipe 33 may branch off from the main pipe 34 at an angle upward relative to the horizontal, as shown in Figure 4. The angle at which the branch pipe 33 points diagonally upward, i.e., the angle between the axis of the branch pipe 33 and the horizontal direction (the direction perpendicular to the axis of the main pipe 34), is preferably 45° or less, and more preferably 30° or less. If the angle is greater than 45°, the branch pipe 33 may interfere with the main pipe 34 unless the length of the branch pipe 33 is increased. To avoid this interference, the branch pipe 33 must be made larger, which reduces compactness. The branch pipe 33 may also branch off from the main pipe 34 at a horizontal angle.

[0026] 5 and 6, the first joint 10 is a joint in which a cleaning port 36a is formed in a so-called 90° elbow (hereinafter also referred to as a joint with a cleaning port). Note that Fig. 3 is a cross-sectional view of the first joint 10A taken along a plane including the axis of a curved pipe portion 35 (described later) (hereinafter referred to as a reference plane). The first joint 10A includes a joint body 31 and a cover body 32. The joint body 31 includes a curved pipe portion (connecting pipe) 35, an extension pipe , a first connecting portion (connecting portion) 37, and a second connecting portion (connecting portion) . The curved pipe portion 35 is formed in a tubular shape that is curved so that the central angle is approximately 90°. In other words, the curved pipe portion 35 (joint main body 31) is curved. It is preferable that the inner diameter of the curved pipe portion 35 is constant regardless of the position in the axial direction of the curved pipe portion 35. The inner diameter of the curved pipe portion 35 is appropriately set to 77.55 mm, for example. Note that the first joint 10 is not limited to a shape that has a curved pipe portion 35, and may have a shape that does not have a curved pipe portion 35. An example of a shape that does not have a curved pipe portion 35 may be a Y-shaped tee, or, in the case where the branch pipe 33 is branched horizontally from the main pipe 34, a tee may be used.

[0027] The first connecting portion 37 and the second connecting portion 38 are sockets and each have a cylindrical shape. The first connecting portion 37 is fixed to the first end 37 of the curved pipe portion 35. The inner diameter of the first connecting portion 37 is larger than the inner diameter of the curved pipe portion 35. The second connecting portion 38 is fixed to the second end 38 of the curved pipe portion 35, opposite the first end 37. The inner diameter of the second connecting portion 38 is equal to the inner diameter of the first connecting portion 37. The first connecting portion 37 and the second connecting portion 38 are different in orientation by approximately 90° (more specifically, 91° 10 minutes). For example, the first connecting portion 37 and the second connecting portion 38 are preferably different in orientation by 91° to 95°. By making the bend angle greater than 90° in this way, a drainage gradient can be ensured, improving drainage performance. The inner diameter of the connecting portions 37, 38 is preferably 52 mm to 155 mm, with 88.65 mm being an example. The inner diameter of the connecting portions 37, 38 is more preferably 75 mm or more and 110 mm or less.

[0028] The extension pipe 36 is formed in a straight pipe shape. In the cross section shown in FIG. 3 , the extension pipe 36 protrudes from the curved pipe portion 35 toward the outside of the curved pipe portion 35. More specifically, the extension pipe 36 extends from the second end portion 38 of the curved pipe portion 35 toward the opposite side from the second connection portion 38 along a tangential direction of the second end portion 38 of the curved pipe portion 35. In this embodiment, a cleaning port 36a is formed at the tip end from which the extension pipe 36 extends. That is, the cleaning port 36a is formed in the joint body 31. The extension tube 36 is preferably formed with a first engagement portion such as a groove. The internal space of the extension pipe 36 is connected to the internal space of the curved pipe portion 35 .

[0029] The opening area of ​​the joint body 31 configured as above is 30 cm 2 The opening area referred to here means the cross-sectional area of ​​the internal space of the joint body 31 in a plane perpendicular to the axis of the joint body 31. However, the opening area is not limited to this.

[0030] The lid body 32 includes an insertion portion 41, a flange portion 42, and a second engagement portion (not shown). The insertion portion 41 is formed in a bottomed cylindrical shape having a peripheral wall portion 45 and a bottom wall portion 46. The peripheral wall portion 45 is formed in a cylindrical shape. The bottom wall portion 46 is formed in a disk shape and covers an opening formed in the first end portion 37 of the peripheral wall portion 45. The insertion portion 41 is inserted into the extension tube 36 from the cleaning port 36a. The flange portion 42 is formed in a disk shape and is fixed to the first end portion 38 (one end portion of the insertion portion 41) of the peripheral wall portion 45 of the insertion portion 41. The flange portion 42 protrudes radially outward beyond the insertion portion 41. The outer diameter of the flange portion 42 is equal to or greater than the outer diameter of the extension pipe 36. The flange portion 42 is detachably attached to the cleaning port 36a.

[0031] For example, the second engagement portion is a swingable lever provided on the flange portion 42. By swinging the second engagement portion, it is possible to switch between an engaged state in which the second engagement portion engages with the first engagement portion of the extension tube 36 and a disengaged state in which the engagement is released. In this manner, the cover 32 is detachably attached to the cleaning port 36a. When the second engagement portion is switched to the disengaged state, the cover 32 can be removed from the cleaning opening 36a, as shown in FIG. The second engagement portion is not limited to a lever.

[0032] 5, in this embodiment, a knob 47 is fixed to the flange portion 42. The knob 47 protrudes from the flange portion 42 toward the outside of the first joint 10A. The knob 47 is a member for operating the lid body 32. 2, 3, and 4, the second joint 20 is disposed downstream of the first connection portion 37 of the first joint 10A via the pipe 2. The first joint 10 and the second joint 20 may be directly connected.

[0033] The configuration of the first joint 10 and the storm water drainage system 100 of this embodiment can be modified in various ways, for example, as described below. 7, the first joint 10A of the first embodiment may be provided with a lid 66 instead of the lid 32. The lid 66 has an insertion portion 67 instead of the insertion portion 41 of the lid 32. The insertion portion 67 closes at least a part of the internal space of the extension pipe 36. The insertion portion 67 does not close the internal space of the curved pipe portion 35. More specifically, the insertion portion 67 is formed in a cylindrical shape with a bottom, having a peripheral wall portion 68 and a bottom wall portion 69. The peripheral wall portion 68 is formed so as to reduce the gap between the insertion portion 67 and the extension tube 36. The outer surface of the bottom wall portion 69 on the opposite side to the peripheral wall portion 68 is formed so as to fit along the inner peripheral surface of the curved tube portion 35.

[0034] In the first fitting 10B configured in this manner, when the insertion portion 67 is inserted into the cleaning port 36a and the flange portion 42 is attached to the cleaning port 36a, the insertion portion 67 does not block the internal space of the curved pipe portion 35. This prevents the flow of rainwater that flows into the curved pipe portion 35 from the first end 37 of the curved pipe portion 35 from being obstructed by the insertion portion 67. Furthermore, because the insertion portion 67 blocks at least a portion of the internal space of the extension pipe 36, it prevents rainwater from flowing in areas other than the internal space of the curved pipe portion 35, causing eddies or turbulence in the rainwater in those areas, which would interfere with the siphoning of rainwater. On the other hand, when the cover 66 is removed from the cleaning port 36a of the extension pipe 36, the inside of the joint body 31 and the like can be cleaned through the cleaning port 36a with a cleaning tool or the like.

[0035] The standpipe 120 has a second joint 20. Details of the second joint 20 will be described later. The standpipe 120 may have one or more second joints 20. The second joints 20 are preferably installed at equal intervals relative to the standpipe 120. Preferably, one is installed every 15 m, and more preferably, one is installed every 5 m. It is preferable that at least one second joint 20 is installed on each floor. In this case, since the floor height varies depending on the building, the installation interval of the second joints 20 can be set appropriately taking into consideration the floor height of the building 200 in which the second joints 20 are installed.

[0036] There are no particular limitations on the SDR value of the pipe 2. The SDR value is the ratio of the outer diameter D to the wall thickness T, and SDR value=outer diameter D / wall thickness T. The outer diameter of the pipe 2 may be, for example, 60.0 mm to 216.0 mm. In particular, the outer diameter of the pipe 2 is preferably 76.0 mm to 216.0 mm, for example, downstream where the flow rate is large. The pipes 2 in the vertical pipe 120 and the horizontal pipe 110 may have the same inner diameter, or may have different inner diameters. For example, the inner diameter of the pipe 2 may be smaller or larger from the upstream side to the downstream side in the drainage direction. For example, in the vertical pipe 120, the inner diameter of the pipe 2 may be smaller from the upstream side to the downstream side in the drainage direction. Furthermore, for example, in the horizontal pipe 110, the inner diameter of the pipe 2 may be larger from the upstream side to the downstream side in the drainage direction.

[0037] The material of the pipe 2 is not particularly limited, and may be, for example, stainless steel, carbon steel, polyethylene, vinyl chloride, or a double-walled fireproof pipe. A double-walled fireproof pipe has an inner pipe made of vinyl chloride and an outer pipe made of fiber mortar, and is excellent in soundproofing against water flow noise, corrosion resistance, earthquake resistance, fire resistance, etc. In particular, when the piping 2 is a fire-resistant double-layer pipe, the inner pipe is a rigid polyvinyl chloride pipe, and therefore when the first joint 10 and second joint 20 described below are made of rigid polyvinyl chloride resin, the piping 2 can be joined to the first joint 10 and second joint 20 with adhesive, making installation easier. In this case, it is preferable that the outer surfaces of the first joint 10 and the second joint 20 are also covered with a fiber mortar layer. Furthermore, if the piping 2 is a fire-resistant double-walled pipe, a space is provided between the outer surface of the inner pipe (hard vinyl chloride) and the inner surface of the outer pipe (fiber mortar). Violent vibration of the inner pipe due to siphoning rainwater drainage can cause the inner and outer pipes to come into contact, generating noise and potentially damaging the inner or outer pipes. To prevent the inner pipe from vibrating due to siphoning, a sheet- or ring-shaped spacer can be provided between the outer surface of the inner pipe (hard vinyl chloride) and the inner surface of the outer pipe (fiber mortar), or the space between the inner and outer pipes can be completely filled with a spacer. Examples of spacers include elastic materials such as synthetic rubber and acrylic rubber; synthetic resins such as polyethylene and polypropylene; foamed plastics and porous synthetic resins made from foamed polystyrene, polypropylene, polyethylene, polyurethane, etc.; and inorganic or organic fiber materials such as glass wool, rock wool, polyester felt, and paper.

[0038] (Second joint 20) 8 to 10 show the second joint 20. FIG. As shown in Figures 8 to 10, the second joint 20 has a first end 11 through which rainwater flows in, a first end 12 through which rainwater flows out, and a reduced section 28 having a water flow area smaller than the water flow area of ​​the first end 11. The reduction unit 28 is configured, for example, as follows.

[0039] (First embodiment) As shown in FIG. 8, the finned joint (second joint 20) has a main body 26 and a plurality of fins 27. The main body 26 is a cylindrical tube having a central axis O1 along the vertical direction, and has an inlet side joint portion (first end) 11 formed at the upper end, an outlet side joint portion (second end) 12 formed at the lower end, and a straight pipe portion 13 formed between them. The inlet-side joint 11 has a ring shape and is coaxially connected to the lower end of the upper pipe (pipe) 2a and fixed by fitting around it. The inner circumferential surface of the inlet-side joint 11 is slightly larger than the outer diameter of the lower end of the upper pipe 2a, and is watertightly connected to the lower end of the upper pipe (pipe) 2a via a sealing material (not shown). The outlet-side joint 12 also has a ring shape and is coaxially fitted and fixed to the upper end of the lower pipe (pipe) 2b. The inner circumferential surface of the outlet-side joint 12 is watertightly connected to the upper end of the lower pipe 2b via a sealing material (not shown).

[0040] The straight pipe section 13 is a cylindrical pipe that is located between the inlet joint 11 and the outlet joint 12 and is coaxial with the inlet joint 11 and the outlet joint 12. The nominal diameters of the upper pipe 2a, the finned joint 20, and the lower pipe 2b may be the same. In this case, the external appearance is the same, resulting in an aesthetically pleasing stormwater drainage system 100. The inner diameter of the straight pipe section 13 is also equal to the inner diameter of the upper pipe 2a and the inner diameter of the lower pipe 2b. Therefore, the flow path extending vertically through the interiors of the upper pipe 2a, the finned joint 20, and the lower pipe 2b forms a cylindrical internal space having the same inner diameter at each position in the vertical direction, except for the portion where the fins 27 are arranged. In other words, the flow path from the upper pipe 2a to the lower pipe 2b via the finned joint 20 is connected smoothly without any steps at the connection between the upper pipe 2a and the finned joint 20 and the connection between the finned joint 20 and the lower pipe 2b.

[0041] In this embodiment, the reduction section 28 is constituted by fins 27. The fins 27 are a plurality of blades formed integrally with the inner wall surface 13a of the straight pipe section 13 of the finned joint 20. In this embodiment, four fins 27 are arranged at equal angular intervals (90° intervals) in the circumferential direction around the central axis O1 of the straight pipe section 13. The number of fins 27 is not limited to four, and may be two, three, five or more, or even ten or more. Each fin 27 has the same shape and dimensions, and is also positioned in the same position along the pipe axis direction.

[0042] That is, as shown in FIG. 3 , all fins 27 are isosceles triangles in longitudinal cross section or side view, with their bases integrally connected to the inner wall surface 13a of the straight pipe section 13. Therefore, each fin 27 is formed to protrude from the inner wall surface 13a toward the pipe axis (center axis). One of the equal sides of the isosceles triangle forming each fin 27, a straight upper side 21, is located upstream (vertically upward) in the flow path, and the other straight lower side 22 is located downstream (vertically downward) in the flow path. The upper and lower sides 21 and 22 are connected at a connection point 23. The most upstream side of the upper side 21 is defined as a starting point B of the contraction section 28. The shape of the second joint 20 is not limited to the above, and it is sufficient if the second joint 20 has a contraction section 28 between the first end 11 and the first end 12, the contraction section 28 having a water flow area smaller than the water flow area of ​​the first end 11.

[0043] Each fin 27 is arranged so as to face another fin 27 at a circumferential position on the opposite side across the tube axis. In the present embodiment, as described above, the four fins 27 are arranged at equal angular intervals when viewed along the tube axis, so that two pairs of fins 27 are arranged facing each other across the tube axis. The upper edges 21 of each of these fins 27 form a thin, inclined surface that protrudes into the flow path. These inclined surfaces connect to the inner wall surface 13a at the uppermost positions of the upper edges 21, and the height at which they protrude from the inner wall surface 13a gradually increases from this uppermost position toward the downstream side, until they reach their highest point at the connection point 23. The thin inclined surface formed by the upper edges 21 arranged in this manner faces rainwater flowing down from the upstream side, and as this rainwater hits the inclined surface, it creates flow path resistance.

[0044] Each lower edge 22 of each fin 27 also forms a thin inclined surface that protrudes into the flow path. These inclined surfaces connect to inner wall surface 13a at the lowest end of the lower edge 22, and the height of the protrusion from inner wall surface 13a gradually increases from this lowest end toward the upstream side, until it reaches its highest point at connection point 23. In other words, the inclined surfaces formed on each upper edge 21 and the inclined surfaces formed on each lower edge 22 have the same shape and dimensions, but their inclination directions are opposite in the vertical direction across connection point 23.

[0045] The left side surface 24 and the right side surface 25 of each fin 27 are flat surfaces each having an isosceles triangle shape and are parallel to each other. Therefore, each fin 27 has a constant thickness from its upper end to its lower end. Because the left side surface 24 and the right side surface 25 extend into the flow path, when rainwater passes through each fin 27, viscous resistance is applied to the rainwater by contacting the left side surface 24 and the right side surface 25. Therefore, the rainwater is subjected to both resistance by contacting the inclined surface formed by the upper side 21 and viscous resistance by contacting the left side surface 24 and the right side surface 25.

[0046] The shape of the fins 27 is not limited to the isosceles triangle shown in FIG. 3, but may be, for example, a right triangle or a trapezoid.

[0047] (Second embodiment) As shown in FIG. 9, a finned joint (rainwater drainage joint) 20B of the second embodiment has a joint body 80, a plurality of fins 81, and a finned ring . The fitting body 80 has a straight pipe section 13 which is a cylindrical pipe having a pipe axis along the vertical direction, an inlet side joint section 11 formed integrally with the upper end of the straight pipe section 13, and an outlet side joint section 12 connected coaxially to the lower end of the straight pipe section 13.

[0048] A finned ring 82 having fins 81 on its inner circumferential surface is integrally connected to the outlet-side joint 12 via a connecting portion 84a. The finned ring 82 has an upstream edge 82a located relatively upstream, a downstream edge 82b located relatively downstream, a contraction section 82c connecting the upstream edge 82a and the downstream edge 82b, and a plurality of fins 81 arranged at equal angular intervals circumferentially around the pipe axis on the inner surface of the contraction section 82c.

[0049] The upstream edge 82a and the downstream edge 82b are both annular flange portions with outer diameters close to the inner diameter of the inner circumferential surface of the straight pipe section 13. Therefore, the upstream edge 82a and the downstream edge 82b can contact the inner wall surface 13a of the straight pipe section 13 without any gaps. When viewed in a cross section including the pipe axis, the inner circumferential surface of the upstream edge 82a gradually becomes thicker from the upstream side to the downstream side. Therefore, although the upstream edge 82a is inserted into the straight pipe section 13, it does not create an excessively large step with respect to the inner wall surface 13a, allowing rainwater passing through it to pass smoothly without disruption. The downstream edge 82b is smoothly connected to the upper end of the connecting portion 84a without creating an excessively large step. Therefore, the downstream edge 82b allows the flow of rainwater passing through it to pass smoothly without being disturbed. In addition, the downstream edge 82b forms an annular gap with the inner surface of the outlet-side joint portion 12, and the lower end of the straight pipe portion 13 is fitted watertightly into this annular gap.

[0050] The contracted section 82c has an arch-like shape in a cross section including the tube axis, with the upper half from the upstream side to the midpoint in the tube axis direction forming a contracted flow path, and the lower half from the midpoint toward the downstream side in the tube axis direction forming an expanded flow path. That is, in the upper half, the inner diameter of the circular opening as viewed along the tube axis gradually decreases from the upstream side to the downstream side, reaching a minimum inner diameter at the boundary with the lower half. Then, in the following lower half, the inner diameter of the circular opening as viewed along the tube axis gradually increases from the minimum inner diameter as viewed from the upstream side to the downstream side, and finally becomes equal to the inner diameter of the connecting section 84a at the boundary with the connecting section 84a.

[0051] Each fin 81 is a substantially linear protrusion having an upper end 81a located at the most upstream side in the tube axis direction and a lower end 81b located at the most downstream side in the tube axis direction. When viewed along the tube axis direction, the lower end 81b of each fin 81 is located at a position slightly shifted laterally from directly below the upper end 81a. Therefore, each fin 81 is arranged at an angle so that a line connecting these upper ends 81a and lower ends 81b intersects with the tube axis when superimposed. Furthermore, an inclined flow path is formed between adjacent fins 81 in a direction that intersects with the tube axis when superimposed.

[0052] When viewed in a cross section perpendicular to a line connecting the upper end 81a and the lower end 81b, each fin 81 has a substantially triangular cross-sectional shape at each position on the line. The height of this triangular cross-section gradually increases from the upper end 81a to the center of the line, and then gradually decreases from the center of the line to the lower end 81b. When these fins 81 are viewed side-by-side, the width gradually increases from the upper end 81a to the center of the line, and then gradually narrows from the center of the line to the lower end 81b. In other words, each fin 81 is thickest at the center in the tube axis direction and gradually becomes thinner from this center toward the upper end 81a. Similarly, each fin 81 gradually becomes thinner from the center toward the lower end 81b. Furthermore, when each fin 81 is viewed in a cross section that includes a straight line connecting the upper end 81a and the lower end 81b and is along the thickness direction of the wall portion of the contraction section 82c, it forms a convex arch shape that follows the inner surface of the contraction section 82c. Each fin 81 can apply a flow resistance to rainwater that gradually increases along the pipe axis direction.

[0053] Finned joint 20B allows rainwater with a reduced flow rate to temporarily accumulate in the flow path between the upper side of each fin 81 and inlet 220 (see FIG. 2). This makes it difficult for air to get into the rainwater flowing into inlet 220, making it possible to reliably induce the siphon effect. Moreover, because the rainwater has already been rectified after passing through each fin 81, it is drained smoothly without swirling. In addition, a finned ring 82 on which each fin 81 is formed is integrated with the outlet-side joint 12, and a socket-type structure is adopted in which it is coaxially fitted into the lower end of the straight pipe section 13. This makes it easy to install and replace each fin 81, as well as to perform maintenance such as cleaning.

[0054] According to the rainwater drainage joint 20B of the second embodiment described above, similar to the first embodiment, high drainage performance can be maintained by the siphon effect, and further, maintenance inside the piping can be easily performed.

[0055] (Third embodiment) As shown in FIG. 10, a finned joint (rainwater drainage joint) 20C of the second embodiment has a joint body 26, an inner pipe 71, and a plurality of fins 27. The inner pipe 71 is arranged coaxially inside the joint body 26. The inner pipe 71 is configured in an inverted truncated cone shape that tapers from the upstream side to the downstream side along the pipe axis. The inner pipe 71 has an inner wall surface 71a and an outer wall surface 71b that taper downward. A circular inlet opening is formed at the upper end of the inner pipe 71, and a circular outlet opening with a smaller diameter than the upper end is formed at the lower end of the inner pipe 71. The outer wall surface 71b of the inner pipe 71 is fixed by a pair of fins 27 in a state where it is spaced apart from the inner wall surface 13a of the straight pipe section 13.

[0056] As a result, two flow paths are formed within the finned joint 20C: a first flow path formed between the inner wall surface 13a and the outer wall surface 71b, and a second flow path formed within the inner wall surface 71a. Therefore, rainwater that flows into this finned joint 20C branches into two paths: one that flows through the first flow path and one that flows through the second flow path. Of these, rainwater flowing through the first flow path slows down due to flow path resistance caused by the reduced flow path area. Meanwhile, rainwater flowing through the second flow path slows down due to flow path resistance caused by hitting the pair of fins 27.

[0057] Furthermore, rainwater that attempts to pass through while swirling can be rectified by each fin 27. Therefore, the finned joint 20C can impart appropriate flow resistance to the rainwater, reducing the flow rate, and simultaneously rectifying the rainwater.

[0058] As a result, with the configuration of finned joint 20C, rainwater with its flow rate reduced temporarily accumulates in the flow paths between the first flow path and the second flow path and the inlet 220. Therefore, air is less likely to enter the rainwater flowing into the inlet 220, making it possible to reliably induce the siphon effect.

[0059] According to the rainwater drainage joint 20C of the third embodiment described above, like the other embodiments, high drainage performance can be maintained by the siphon effect, and further, maintenance of the piping 2 can be easily performed.

[0060] The second joint 20 is not limited to a configuration having fins 27, and the inner diameter of the joint itself may be reduced.

[0061] From the viewpoint of drainage, as shown in Fig. 11, it is preferable that the reduction section 28 be positioned so that the vertical length L3 between its start point B and the bend section 4 is 1000 mm or more. Here, the vertical length L3 refers to the length from the lower end of the horizontal opening of the bend section 4 to the start point B of the reduction section 28. The bend section 4 refers to the connection section between the upright pipe 120 and the horizontal pull pipe 110. The bend section 4 may represent, for example, a joint such as an elbow or a tee, or the connection section 112 of the junction pipe (horizontal pull pipe 110) as shown in Fig. 11.

[0062] According to the above configuration, rainwater with its flow velocity reduced temporarily accumulates in the flow path between the upper side 21 of each fin 27 and the bent portion 4, making it difficult for air to enter the rainwater flowing into the second joint 20 and ensuring the induction of the siphon effect. Moreover, because the rainwater has already been rectified by the left side surface 24 and the right side surface 25 after passing through each fin 27, it is drained smoothly without swirling.

[0063] The outer circumferential surface of the straight pipe section 13 of the second joint 20 may be wrapped with a heat insulating material (such as glass wool or rock wool) or sound insulating material. The flow velocity increases in the contracted section 28, and the drainage noise is likely to be transmitted inside the building 200. By using such a configuration, the drainage noise can be prevented from diffusing inside the building 200. In particular, when the second joint 20 is disposed in the compartment penetration portion 211 as shown in Fig. 4, a fire-resistant material may be wrapped around the outer periphery of the second joint 20, or a heat-expandable fire-resistant layer may be provided inside the joint. The fire-resistant layer may be formed from a thermoplastic resin composition containing heat-expandable graphite. Such a configuration allows the rainwater drainage system 100 to have high fire resistance.

[0064] Furthermore, it may not be possible to provide a cleaning port at the bend 4 due to reasons such as the inability to secure a working space at the top of the bend 4 to remove the cover and insert cleaning tools. As shown in FIG. 11 , if a cleaning port is not provided at the bend 4, a cleaning port may be provided in the upstream horizontal lead pipe 110. In this case, the cleaning port is preferably arranged horizontally on the side of the horizontal lead pipe 110. If the cleaning port is arranged above the horizontal lead pipe 110, air may accumulate near the cleaning port. On the other hand, if the cleaning port is arranged below the horizontal lead pipe 110, rainwater and debris may accumulate near the cleaning port. By arranging the cleaning port horizontally on the side of the horizontal lead pipe 110, it is possible to prevent air from accumulating and rainwater and debris from accumulating.

[0065] As described above, the rainwater drainage system 100 in this embodiment has an inlet 220 through which rainwater flows in, a horizontal pull-out pipe 110 connected to the inlet 220, and a vertical pipe 120 connected to the horizontal pull-out pipe 110, and the vertical pipe 120 is provided with a first fitting 10 and a second fitting 20, the first fitting 10 is provided with a cleaning port 36a, the second fitting 20 is provided with a reduction section 28, and the second fitting 20 is provided within 1000 mm of the cleaning port 36a. With this configuration, the upright pipe 120 has a cleaning port 36a and a reduced section 28. This allows the reduced section 28, which is particularly prone to accumulating dirt, to be cleaned through the cleaning port 36a. Furthermore, since the reduced section 28 is located within 1000 mm of the cleaning port 36a, it is possible to easily access the reduced section 28 from the cleaning port 36a. This makes maintenance easier.

[0066] In addition, the first joint 10 may connect the upright pipe 120 and the horizontal pipe 110 . The upright pipe 120 and the horizontal pipe 110 are usually connected with an elbow, but by connecting them using the first joint 10, it can be used as a cleaning port 36a, thereby facilitating maintenance. Furthermore, with this configuration, the cleaning port 36a can be provided at the connection between the upright pipe 120 and the horizontal pipe 110, thereby reducing costs.

[0067] The first joint 10 may also be provided within 1500 mm from the floor 210 of the building 200. With this configuration, for example, it becomes easy for a worker to clean the inside of the pipe 2 through the cleaning port 36a while standing, thereby facilitating maintenance.

[0068] Furthermore, the first joint 10 may be provided upstream of the second joint 20 . Dust is particularly likely to accumulate on the upstream side of the reduction section 28. With this configuration, it becomes easy to clean out the dust that has accumulated on the upstream side of the reduction section 28. This makes maintenance easier.

[0069] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0070] 200 Buildings 210 beds 220 Inlet 100 Stormwater drainage system 110 Horizontal draw pipe 120 vertical pipe 10 First joint 20 Second joint 28 Reduction section 36a Cleaning port

Claims

1. An inlet through which rainwater flows in; A horizontal pipe connected to the inlet; a vertical pipe connected to the horizontal pipe, a first joint and a second joint are disposed on the vertical pipe; The first joint is provided with a cleaning port, the second joint is provided with a reduced portion; The second joint is provided within 1000 mm from the cleaning port. Stormwater drainage system.

2. The first joint connects the vertical pipe and the horizontal pipe. The stormwater drainage system of claim 1.

3. The first joint is provided within 1500 mm from the floor of the building. The stormwater drainage system of claim 1.

4. The first joint is provided upstream of the second joint. The stormwater drainage system of claim 1.

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