JP2020020195A - Rainwater drainage device - Google Patents

Abstract

To provide a rainwater drainage device capable of reducing splashing out of water from a drain basin.SOLUTION: A rainwater drainage device 10 comprises an inflow entrance 11, a drain basin 72 and an inlet piping part 71. Rainwater flows into the inflow entrance 11. Rainwater flowing into the inflow entrance 11 flows into the drain basin 72. The inlet piping part 71 is arranged on the upstream side of the drain basin 72 along the lateral direction and is connected to the drain basin 72. The inlet piping part 71 has an enlarged diameter part 92, piping 81 and piping 83. The enlarged diameter part 92 is arranged on the downstream side of the piping 81 and enlarges a diameter at least on the lower end side in a cross-sectional view including a pipe axis 81o of the piping 81. The piping 83 is arranged on the downstream side of the enlarged diameter part 92. In a cross-sectional view, an angle θ1 formed by an extension line M1 of a bottom edge 81c in the piping 81 and a bottom edge 92c in the enlarged diameter part 92 is 20° or larger and 50° or smaller.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rainwater drainage device for draining rainwater.

  Conventionally, there has been proposed a configuration for improving drainage efficiency of rainwater by inducing a siphon phenomenon (for example, see Patent Document 1).

  For example, in the configuration disclosed in Patent Literature 1, a siphon phenomenon is induced by a siphon pipe configured by an elbow joint, piping, and the like arranged below an eaves gutter of a house.

Japanese Patent No. 4130616

  As described above, the amount of rainwater drained by using the siphon phenomenon increases, but no consideration has been given to the discharge of rainwater to the drainage mass. That is, the amount of drainage of rainwater is increased, and water may splash out of the drainage mass.

  An object of the present invention is to provide a rainwater drainage device that can reduce splashing of water from a drainage mass.

  In order to achieve the above object, a rainwater drainage device according to a first aspect of the present invention includes an inlet, a drainage mass, and a drainage pipe. The drainage mass receives the rainwater flowing into the inlet. The drainage pipe part is arranged on the upstream side of the drainage mass along the lateral direction, and is connected to the drainage mass. The drainage pipe section has a first enlarged diameter section, a first pipe section, and a second pipe section. The first enlarged diameter portion is disposed downstream of the first piping portion, and expands in diameter at least at a lower end side in a cross-sectional view including the pipe axis of the first piping portion. The second piping section is arranged downstream of the first enlarged diameter section. In a cross-sectional view, an angle θ1 formed by an extension of the lower end of the first pipe portion and the lower end of the first enlarged-diameter portion is not less than 20 ° and not more than 50 °.

  Thereby, even when a large amount of rainwater flows into the drainage mass, the diameter of the drainage pipe gradually increases as the rainwater moves along the lower end of the first enlarged diameter portion of the drainage pipe portion. Splashing of water from the water can be reduced.

  It should be noted that the “lateral direction” is not strictly meaningful, but may be any range that can be recognized as a horizontal direction according to social wisdom, and includes an inclination.

  A rainwater drainage device according to a second invention is the rainwater drainage device according to the first invention, wherein a cross-sectional area S1 of the first pipe portion and a cross-sectional area S2 of the second pipe portion are 1.3 ≦ S2 / S1 ≦ 2.1 is satisfied.

  By setting the diameter expansion rate in an appropriate range, the flow velocity can be effectively reduced.

  A rainwater drainage device according to a third invention is the rainwater drainage device according to the first or second invention, wherein at least a pipe shaft of the first pipe portion is provided between the first pipe portion and the first enlarged diameter portion. An R shape is formed on the lower side.

  This makes it easier for the rainwater to flow from the first pipe section to the first enlarged diameter section along the lower end, so that the resistance to the inner surface of the pipe is considered to increase, and the flow velocity can be reduced.

  A rainwater drainage device according to a fourth invention is the rainwater drainage device according to any one of the first to third inventions, wherein a height of an upper end of the first pipe portion and an upper end of the second pipe portion in a sectional view. Matches. The first enlarged diameter portion is eccentrically enlarged.

Thereby, the flow rate of rainwater can be reduced by the resistance of the first enlarged diameter portion.
It should be noted that the term “match” does not have a strict meaning, and it is sufficient that they match based on social wisdom.

  A rainwater drainage device according to a fifth invention is the rainwater drainage device according to any one of the first to fourth inventions, further comprising a vertical pipe portion. The vertical pipe section is arranged along the vertical direction. The drainage pipe is disposed between the lower end of the vertical pipe and the drainage mass.

  In this way, by disposing the drainage pipe section having the enlarged diameter portion between the vertical pipe section and the drainage mass, the flow rate of rainwater in the vertical pipe section can be reduced before being supplied to the drainage mass.

  Further, the “vertical direction” in the present specification does not have a strict meaning, and may be any range that can be recognized as a vertical direction in accordance with social wisdom, and includes an inclination.

  A rainwater drainage device according to a sixth invention is the rainwater drainage device according to the fifth invention, wherein the nominal diameter of the vertical pipe portion is 75A or more.

  The flow rate of rainwater falling from the vertical pipe section of 75 A or more can be reduced and then supplied to the drainage mass.

  A rainwater drainage device according to a seventh invention is the rainwater drainage device according to the fifth or sixth invention, wherein the vertical pipe section has a design flow rate of 15 L / s or more.

  As described above, even when a large amount of rainwater flows in the upright section having a design flow rate of 15 L / s or more, it is possible to reduce the flow velocity and reduce the splash of water from the drainage mass.

A rainwater drainage device according to an eighth aspect of the present invention is the rainwater drainage device according to the first aspect, wherein the drainage pipe section has a second enlarged-diameter section and a third pipe section. The second enlarged diameter portion is arranged on the downstream side of the second piping portion, and is enlarged at least at a lower end side in a cross-sectional view. The third piping section is disposed downstream of the second enlarged diameter section. In a cross-sectional view, the angle θ2 formed by the extension of the lower end of the second pipe portion and the lower end of the second enlarged-diameter portion is not less than 20 ° and not more than 50 °.
Thus, by providing a plurality of enlarged diameter portions, the flow velocity can be reduced.

  A rainwater drainage device according to a ninth aspect is the rainwater drainage device according to any one of the first to seventh aspects, further comprising a siphon inducing section. The siphon inducing section is arranged at the inlet and induces a siphon phenomenon.

  As a result, even when a siphon phenomenon occurs due to the siphon inducing portion and a large amount of rainwater flows into the drainage mass, the flow velocity can be reduced in the drainage pipe portion, so that water splashing from the drainage mass can be reduced. Can be.

  ADVANTAGE OF THE INVENTION According to this invention, the rainwater drainage device which can reduce the splash of water from a drainage mass can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows the structure of the rainwater drainage system in Embodiment 1 concerning this invention. FIG. 2 is a cross-sectional view near the inflow port in the rainwater drainage system of FIG. 1. FIG. 3A is a front view showing a configuration of a siphon induction unit in the drainage device of FIG. 2, and FIG. 3B is a plan view of the siphon induction unit of FIG. The schematic diagram of the rainwater drainage device of FIG. The side schematic diagram of the drainage part of the rainwater drainage device of FIG. FIG. 6 is a side cross-sectional view of the inlet pipe section of FIG. 5. The figure which shows the combination of the piping in the inlet piping part of FIG. The side view which shows the drainage part of the rainwater drainage device in Embodiment 2 concerning this invention. FIG. 9 is a side cross-sectional view of the inlet pipe section of FIG. 8. The side view which shows the drainage part of the rainwater drainage device in Embodiment 3 concerning this invention. The side sectional view of the entrance piping part of FIG. The figure which shows the table of the result of Examples 1-7 and Comparative Examples 1-6. FIG. 14 is a side sectional view of an inlet pipe section according to a sixth embodiment.

  A rainwater drainage device 10 according to an embodiment of the present invention will be described with reference to the drawings.

(1. First Embodiment)
Hereinafter, the rainwater drainage device 10 according to the first embodiment of the present invention will be described.

<Structure>
FIG. 1 is a diagram illustrating a configuration of a rainwater drainage device 10 according to the present embodiment.

  The rainwater drainage device 10 of the present embodiment constitutes a part of a rainwater drainage system 1 installed in a building 100, as shown in FIG.

  The building 100 is, for example, a three-story building, and slabs 101 are provided between the first and second floors and between the second and third floors, respectively.

(Rainwater drainage system 1)
The rainwater drainage system 1 moves rainwater that has fallen on the roof 105 of the building 100 to the vicinity of the ground and drains it to a sewer pipe. The rainwater drainage system 1 includes six rainwater drainage devices 10, as shown in FIG. Three of the six rainwater drainage devices 10 are arranged near and along the side surface 103 of the building 100. The remaining three rainwater drainage devices 10 are arranged along the side surface 104 near the side surface 104 facing the side surface 103 of the building 100.

(Rainwater drainage device 10)
Each rainwater drainage device 10 has an inlet 11, a siphon induction section 12 (see FIG. 2), a vertical pipe section 13, a horizontal pipe section 14, a vertical pipe section 15, and a drain section 16. .

(Inlet 11)
The inflow port 11 is an opening formed on the rooftop 105, and the rainwater that has fallen on the rooftop 105 flows in.

  FIG. 2 is a side sectional view showing the inflow port 11 of the rainwater drainage device 10 and a siphon induction section 12 described later.

  As shown in FIG. 2, the inflow port 11 is formed on a bottom surface 102 a of a concave portion 102 formed on a roof 105.

  In the present embodiment, the three inlets 11 of the three rainwater drainage devices 10 along the side surface 103 are arranged side by side along the edge 105a of the roof 105, as shown in FIG. Also, the three inlets 11 of the three rainwater drainage devices 10 along the side surface 104 are arranged side by side along the end 105b facing the end 105a of the rooftop 105. That is, the roof 105 is provided with the six inlets 11.

  Note that the ends 105a and 105b of the rooftop 105 may be inclined toward one of the directions along the ends. The roof 105 may be inclined from the center toward the ends 105a and 105b.

  Further, in the present embodiment, the inflow port 11 is formed on the bottom surface 102a of the concave portion 102 formed on the roof 105, but may be formed directly on the roof 105 without providing the concave portion 102.

(Siphon trigger 12)
The siphon induction part 12 is arrange | positioned so that the inlet 11 may be closed, as shown in FIG.

  As a material of the siphon induction part 12, for example, an olefin resin such as PE (polyethylene) or PP (polypropylene), a vinyl chloride resin, or a metal such as aluminum, an aluminum alloy, and stainless steel can be used.

  By using a resin, aluminum, or an aluminum alloy, the siphon induction section 12 having a desired shape can be obtained at a low weight and at a low cost.

  FIG. 3A is a plan view of the siphon induction section 12, and FIG. 3B is a cross-sectional view taken along the line AA 'in FIG. 3A.

  The siphon induction part 12 has a base part 41, a lid part 42, and a rectifying fin 43.

  As shown in FIGS. 3A and 3B, the base portion 41 includes an annular bottom surface 41a, a drop 41b formed at substantially the center of the bottom surface 41a for dropping rainwater, and a cylindrical portion 41c. And The dropout 41b is formed at the upper end of the cylindrical portion 41c. The tubular portion 41c is arranged on the vertical piping portion 13.

  As shown in FIGS. 3A and 3B, the bottom surface 41a is an annular member having a dropout 41b formed at a substantially central portion. A plurality of rectifying fins 43 are arranged at equal angular intervals around the dropout 41b on the annular bottom surface 41a.

  As shown in FIG. 3A, the dropout 41b is a through hole formed in the center of the base 41, and is formed inside the cylindrical portion 41c. The outlet 41 b communicates with the upper end of the vertical pipe section 13, and causes rainwater that has flowed into the siphon induction section 12 from a 360-degree direction to fall into the vertical pipe section 13.

  As shown in FIGS. 3A and 3B, the cylindrical portion 41c is a cylindrical member, is connected to the bottom surface 41a at the upper end thereof, and is formed to protrude downward from the bottom surface 41a. Have been. The cylindrical portion 41c has a drop opening 41b formed therein.

  As shown in FIGS. 3A and 3B, the lid 42 is a circular plate disposed above the base 41 and concentrically with a drop 41 b formed at the center of the base 41. And is supported by a plurality of rectifying fins 43 erected on the bottom surface 41a of the base portion 41. Further, as shown in FIG. 3B, the lid 42 is disposed above the base 41 (dropper 41b) with a predetermined gap G (height) from the bottom surface 41a. .

  The plurality of flow fins 43 are provided on the bottom surface 41a of the base 41 in order to regulate the flow of rainwater flowing into the outlet 41b, as shown in FIGS. 3A and 3B. More specifically, the plurality of rectifying fins 43 are plate-like members arranged along a substantially vertical direction, as shown in FIG. Are provided at equal angular intervals on the circumference of the circle.

  The eight rectifying fins 43 are arranged along the radial direction on the annular bottom surface 41a.

  Thereby, as shown in FIG. 3A, even when the rainwater flowing into the gap G between the bottom surface 41a of the base portion 41 and the lid portion 42 infiltrates (see the dashed line in the drawing), The rectifying fins 43 rectify the rainwater and can guide the rainwater toward the center of the outlet 41b.

  For this reason, it is possible to prevent rainwater from flowing in the vertical pipe section 13 in a swirl shape and forming an air column at the center thereof.

  As a result, by preventing the air column from being formed at the center of the rainwater flowing into the outlet 41b by the rectifying fins 43, it is possible to effectively prevent the occurrence of the siphon phenomenon occurring in the vertical pipe portion 13. Can be eliminated.

(Standing piping section 13)
FIG. 4 is a schematic configuration diagram of the rainwater drainage device 10. As shown in FIG. 4, the vertical pipe section 13 in the rainwater drainage device 10 is disposed downward from the inflow port 11. The vertical pipe section 13 has a pipe 21 as shown in FIG. The pipe 21 is a tubular member made of PE (polyethylene), and is arranged along a substantially vertical direction (also referred to as a vertical direction) as shown in FIG.

  As shown in FIG. 2, the upper end of the pipe 21 (also referred to as the upper end 13 a of the standing pipe section 13) is connected to the edge of the inflow port 11 from below, and is connected to the inflow port 11. The lower end of the pipe 21 (also referred to as the lower end of the vertical pipe section 13) is connected to the horizontal pulling pipe section 14.

  As the pipe 21, for example, a pipe having a nominal diameter of 50A, 75A, 100A, 125A, 150A, 200A, or the like is used. The inner diameter is determined at each nominal diameter for each type of piping. In the present embodiment, for example, polyethylene is used for the material of the pipe, but the material is not limited to this.Other olefins such as polypropylene may be used, and further, polyvinyl chloride or the like is used. You may.

  In the present embodiment, the upright pipe section 13 has one pipe 21, but may have a plurality of pipes 21 and joints connecting them.

(Horizontal piping section 14)
As shown in FIG. 4, the horizontal pulling pipe portion 14 is arranged along the horizontal direction, and one end is connected to a lower end of the vertical pipe portion 13. The other end of the horizontal pulling pipe 14 is connected to a vertical pipe 15 described later. Further, although not shown in the drawing, the horizontal pulling pipe portion 14 is arranged so as to be slightly inclined such that the end on the stand pipe portion 15 side is lower than the end on the opposite side, and flows in from the stand pipe portion 13. The rainwater is moved toward the vertical piping section 15.

  As shown in FIG. 4, the horizontal pulling pipe portion 14 includes an elbow joint 31, a pipe 32, and an elbow joint 33 which are sequentially arranged along the horizontal direction.

  The elbow joint 31 is connected to a lower end of the vertical pipe section 13 (also referred to as a lower end of the pipe 21). One end of the pipe 32 is connected to a lower end of the vertical pipe section 13 (also referred to as a lower end of the pipe 21) by an elbow joint 31. The other end of the pipe 32 is connected to an elbow joint 33, and the elbow joint 33 is connected to an upper end of the vertical pipe section 15.

  The pipe 32 has a nominal diameter of 50 A, 75 A, 100 A, 125 A, 150 A, 200 A, or the like, for example. The inner diameter is determined at each nominal diameter for each type of piping. In the present embodiment, for example, polyethylene is used for the material of the pipe, but the material is not limited to this.Other olefins such as polypropylene may be used, and further, polyvinyl chloride or the like is used. You may.

(Standing piping section 15)
The upright pipe section 15 is arranged along the vertical direction, and has an upper end connected to the horizontal pulling pipe section 14 as shown in FIG. The vertical pipe section 15 is disposed so as to penetrate the slab 101. The vertical pipe section 15 is configured to have a design flow rate of 15 L / s or more.

  As shown in FIG. 4, the vertical pipe section 15 has a pipe 61 and an elbow joint 62. The upper end of the pipe 61 is connected to the elbow joint 33. The lower end of the pipe 61 is connected to an elbow joint 62.

  As the pipe 61, a pipe having a nominal diameter of 75A or more is used. For example, a pipe having a nominal diameter of 75A, 100A, 125A, 150A, 200A, or the like is used. The inner diameter is determined at each nominal diameter for each type of piping.

  The elbow joint 62 is connected to a lower end of the pipe 61 and is connected to a pipe 81 (to be described later) which is drawn horizontally.

  When olefin-based piping is used for the piping (piping 21, 32, 61, 81, 83 (described later) and the like) used in the rainwater drainage device 10 of the present embodiment, the elbow joint 31, the elbow joint 33, the elbow joint For the joint 62 (to be described later) and the eccentric increaser 82 (to be described later), for example, it is preferable to use an EF (Electric fusion) joint made of olefin. Heating wires are embedded in these joints, and when electricity is supplied, the resin on the inner surface of the joint and the outer surface of the pipe are heated and melted and fused, so that the joint and the pipe are joined. In the case where piping other than olefin, for example, polyvinyl chloride is used for the piping used for the rainwater drainage device 10 of the present embodiment, the elbow joint 31, the elbow joint 33, the elbow joint 62, and the eccentric increaser As 82, a material made of polyvinyl chloride can be used. Note that a joint that is compatible with the nominal diameter of the pipe connected to the joint is used.

(Drainage unit 16)
FIG. 5 is a side view showing the vicinity of the drainage section 16 in FIG.

  The drainage section 16 of the rainwater drainage device 10 is arranged along the lateral direction, is connected to the elbow joint 62 of the vertical pipe section 15, and discharges rainwater to the outside of the building 100. The drainage section 16 has an inlet pipe section 71, a drainage mass 72, and an outlet pipe section 73.

  The inlet pipe section 71 has a pipe 81, an eccentric increaser 82, and a pipe 83 arranged sequentially in the lateral direction. Although not shown in the drawing, the inlet pipe 71 is disposed so as to be slightly inclined such that the end on the drainage mass 72 side is higher than the end on the opposite side. Move.

FIG. 6 is a side sectional view near the eccentric increaser 82.
One end of the pipe 81 is connected to the elbow joint 62. The other end of the pipe 81 is connected to an eccentric increaser 82 (an example of an enlarged diameter portion). Although FIG. 6 shows a configuration using the pipe 81, the eccentric increaser 82 and the pipe 83 made of vinyl chloride, as described above, the olefin is added to the pipe 81, the eccentric increaser 82 and the pipe 83. (Especially polyethylene). In that case, it is preferable to use an EF joint for the eccentric increaser 82. The same applies to an inlet pipe 171 in FIG. 9 to be described later, an inlet pipe 271 in FIG. 11, and an inlet pipe 171 ′ in FIG.

  The eccentric increaser 82 is a joint that connects pipes having different diameters while shifting their axes. The eccentric increaser 82 includes a first insertion portion 91, an enlarged diameter portion 92 disposed downstream of the first insertion portion 91, a second insertion portion 93 disposed downstream of the enlarged diameter portion 92, Having.

  The end of the pipe 81 is inserted inside the first insertion portion 91. A step is formed on the inner peripheral surface 91a of the first insertion portion 91. The upstream inner peripheral surface 91a1 of the inner peripheral surface 91a is disposed on the outer peripheral side of the downstream inner peripheral surface 91a2 of the inner peripheral surface 91a1. A wall 91b is formed so as to connect the inner peripheral surface 91a1 and the inner peripheral surface 91a2. The wall 91b is formed substantially perpendicular to the axis of the first insertion portion 91 (coinciding with the pipe axis 81o of the pipe 81). The tip of the inserted pipe 81 contacts the wall 91b. The inner peripheral surface 91a2 is located substantially on the same plane as the inner peripheral surface 81a of the pipe 81.

  The enlarged diameter portion 92 is enlarged downward in a sectional view passing through the pipe shaft 81o of the pipe 81, and is not enlarged upward. That is, the upper end 92b of the inner peripheral surface 92a of the enlarged diameter portion 92 in a sectional view is formed in a substantially horizontal direction, and the lower end 92c is formed so as to be inclined downward so that the height decreases toward the downstream. . A connecting portion 94 between the first insertion portion 91 and the enlarged diameter portion 92 is shown.

  The end of the pipe 83 is inserted inside the second insertion portion 93. The first insertion section 91 is provided eccentrically with respect to the second insertion section 93. The axis of the first insertion section 91 (coincident with the pipe axis 81o of the pipe 81) is located above the axis of the second insertion section 93 (coincident with the pipe axis 83o of the pipe 83). A wall 93b is formed at an end of the inner peripheral surface 93a of the second insertion portion 93 on the side of the enlarged diameter portion 92. An end 92ae of the inner peripheral surface 92a of the enlarged diameter portion 92 on the side of the second insertion portion 93 is disposed radially inward of the inner peripheral surface 93a, and the wall 93b is formed by expanding the diameter of the end 92ae and the inner peripheral surface 93a. It is formed so as to connect the ends on the part 92 side. The wall 93b is formed substantially perpendicular to the axis of the first insertion portion 91 (coinciding with the pipe axis 81o of the pipe 81). The tip of the inserted pipe 83 comes into contact with the wall 91b. The radial height of the wall 93b substantially matches the thickness of the pipe 83, and the radial position of the end 92ae and the inner peripheral surface 83a of the pipe 83 substantially matches. In the present embodiment, the enlarged diameter portion 92 is defined from the connection portion 94 of the eccentric increaser 82 to the end 92ae in the lateral direction.

  Here, the angle θ1 formed between the extension line M1 of the lower end 81c in the sectional view of the inner peripheral surface 81a of the pipe 81 and the lower end 92c in the sectional view of the inner peripheral surface 92a of the enlarged diameter portion 92 is 20 °. ≤θ≤50 °.

  As described above, the pipe 83 has one end inserted into the second insertion portion 93 of the eccentric increaser 82 and the other end connected to the drainage mass 72.

  In addition, the upper end 83b of the inner peripheral surface 83a of the pipe 83 and the upper end 81b of the inner peripheral surface 81a of the pipe 81 substantially match in the height direction in a sectional view.

  Here, the diameter expansion ratio (= S2 / S1), which is the ratio of the outer diameter area S2 of the pipe 83 to the outer diameter area S1 of the pipe 81, satisfies 1.3 ≦ S2 / S1 ≦ 2.1.

  As the combination of the pipe 81 and the pipe 83, combinations 1 to 5 of the pipes having the nominal diameters shown in the table of FIG. 7 are used. The inner diameter is determined at each nominal diameter for each type of piping. In combination 1, a pipe having a nominal diameter of 75A is used as the pipe 81, and a pipe having a nominal diameter of 100A is used as the pipe 83.

  Here, since the outer diameter specified by the nominal diameter is different between JIS (Japanese Industrial Standards) and ISO (International Organization Standardization), the pipe 81 and the pipe 83 are used in accordance with the JIS specified pipe. The diameter expansion ratios of both cases when using a pipe are shown. In addition, since the ISO does not specify a pipe of 125 A, the diameter expansion ratio of the ISO is not described in the combinations 2 and 4. For example, in combination 1, in the case of JIS, the outer diameter area S2 of the pipe 83 becomes 1027.3 (outer diameter 114), the outer diameter area S1 of the pipe 81 becomes 6221.139 (outer diameter 89), and the expansion ratio ( S2 / S1) is 1.64. On the other hand, in the case of ISO, the outer diameter area S2 of the pipe 83 is 12271.85 (outer diameter 125), the outer diameter area S1 of the pipe 81 is 6361.725 (outer diameter 90), and the expansion ratio (S2 / S1) Is 1.93.

  In combination 2, a pipe having a nominal diameter of 100A is used for the pipe 81, a pipe having a nominal diameter of 125A is used for the pipe 83, and the JIS expansion ratio is 1.51. In combination 3, a pipe having a nominal diameter of 100A is used as the pipe 81, a pipe having a nominal diameter of 150A is used as the pipe 83, and the JIS expansion ratio becomes 2.09 and the ISO expansion ratio becomes 2.07. . In combination 4, a pipe having a nominal diameter of 125A is used for the pipe 81, a pipe having a nominal diameter of 150A is used for the pipe 83, and the JIS diameter expansion ratio is 1.39. In combination 5, a pipe having a nominal diameter of 150A is used as the pipe 81, a pipe having a nominal diameter of 200A is used as the pipe 83, and the JIS expansion ratio is 1.71 and the ISO expansion ratio is 1.93. .

  From the table of FIG. 7, in the present embodiment, S2 / S1 is set to be 1.3 or more and 2.1 or less.

  The drainage mass 72 is provided to prevent clogging of the pipe. The drainage mass 72 in the present embodiment has a substantially rectangular parallelepiped shape, and has a side surface 72b to which the inlet piping 71 is connected and a side surface 72c to which the outlet piping 73 is connected. The side surface 72b is arranged to face the side surface 72c. The side surface 72b and the side surface 72c are arranged such that their main surfaces are parallel to each other. The pipe 83 passes through the side surface 72 b of the drainage mass 72 and is connected to the drainage mass 72.

  The outlet pipe part 73 allows rainwater drained from the drainage mass 72 to flow to the sewer pipe. The outlet pipe section 73 has a pipe 84. The pipe 84 is arranged along the lateral direction. Although not shown in the drawing, the outlet pipe portion 73 is disposed so as to be slightly inclined such that the end on the drainage mass 72 side is higher than the end on the opposite side. (Not shown). The pipe 84 penetrates the side surface 72c and is connected to the drainage mass 72.

  In this embodiment, for the pipe 81, the eccentric increaser 82, and the pipe 83, the pipe is made of, for example, polyethylene, but is not limited thereto. May be used, and further, polyvinyl chloride or the like may be used.

  Further, the pipes 81, 83, and 84 may be constituted by a plurality of pipes and joints connecting them.

<Action>
In the rainwater drainage device 10, the rainwater that has fallen on the roof 105 of the building 100 flows into the concave portion 102, and flows into the pipe 21 through the siphon induction portion 12 disposed at the inlet 11. Here, since the siphon phenomenon occurs, the vertical pipe section 13 becomes full and a large amount of rainwater can be drained.

  When rainwater flowing from the plurality of inlets 11 falls down the vertical pipe section 13, it flows into the horizontal pulling pipe section 14 and flows into the vertical pipe section 15.

  In the rainwater drainage device 10, the rainwater that has fallen down the vertical pipe portion 15 is decelerated at the enlarged diameter portion 92 of the inlet pipe portion 71 and flows into the drainage mass 72. The rainwater flowing into the drainage mass 72 is discharged to the sewer through the outlet pipe 73.

(2. Embodiment 2)
Next, a rainwater drainage device 10 according to a second embodiment of the present invention will be described. The rainwater drainage device 10 of the second embodiment is different from the first embodiment in that the diameter is increased a plurality of times. Therefore, this difference will be mainly described.

  FIG. 8 is a side view showing an inlet pipe 171 of the drainage unit 116 in the rainwater drainage device 10 according to the second embodiment. FIG. 9 is a side sectional view showing the inlet pipe part 171. 8 and 9 includes a pipe 81, an eccentric increaser 82, a pipe 83, an eccentric increaser 182, and a pipe 183. The downstream end of the pipe 83 is connected to the eccentric increaser 182. A pipe 183 is connected to the downstream side of the eccentric increaser 182, and the other end of the pipe 183 is connected to the drainage mass 72. The outer diameter cross-sectional area of the pipe 183 is larger than the outer diameter cross-sectional area of the pipe 83.

  The outer diameter cross-sectional area S12 of the pipe 183 is larger than the outer diameter cross-sectional area S11 of the pipe 83, and the diameter expansion rate (= S12 / S11) is set to 1.3 or more and 2.1 or less. The outer diameter cross-sectional area S11 of the pipe 83 has the same value as the outer diameter cross-sectional area S2 described above.

  Further, the upper end 83b of the inner peripheral surface 83a of the pipe 83 in a cross-sectional view, the upper end 81b of the inner peripheral surface 81a of the pipe 81, and the upper end 183b of the inner peripheral surface 183a of the pipe 183 substantially coincide with each other in the height direction.

  Further, the eccentric increaser 182 has a first insertion portion 191, an enlarged diameter portion 192, and a second insertion portion 193. The first insertion portion 191, the enlarged diameter portion 192, and the second insertion portion 193 have a similar configuration except that the first insertion portion 91, the enlarged diameter portion 92, and the second insertion portion 93 of the eccentric increaser 82 have different outer diameters. is there. An upper end 192b of the inner peripheral surface 192a of the enlarged diameter portion 192 in a sectional view coincides with the upper end 83b and the upper end 183b.

  That is, the angle θ2 formed between the extension line M2 of the lower end 83c in the cross section of the inner peripheral surface 83a of the pipe 83 and the lower end 192c of the inner peripheral surface 192a of the enlarged diameter portion 192 in the cross section is 20 ° ≦ θ2 ≦ 50 ° is satisfied. Also, a connecting portion 194 between the enlarged diameter portion 192 and the first insertion portion 191 is illustrated.

  As described above, by expanding the diameter a plurality of times, the flow velocity can be efficiently reduced in a wide flow region.

(3. Embodiment 3)
Next, a rainwater drainage device 10 according to a third embodiment of the present invention will be described. In the rainwater drainage device 10 of the third embodiment, a concentric increaser 282 is used without using the eccentric increaser 82. Therefore, this difference will be mainly described.

  FIG. 10 is a side view showing the inlet pipe 271 of the drain 216 in the rainwater drainage device 10 according to the third embodiment. FIG. 11 is a side sectional view showing the inlet pipe section 271. The inlet pipe section 271 shown in FIGS. 10 and 11 has a pipe 81, an increaser 282, and a pipe 83. The downstream end of the pipe 81 is connected to the increaser 282, and the upstream end of the pipe 83 is connected to the increaser 282.

  As described above, the outer diameter cross-sectional area S2 of the pipe 83 is larger than the outer diameter cross-sectional area S1 of the pipe 81, and the expansion ratio (= S2 / S1) is set to 1.3 or more and 2.1 or less. I have.

  The increaser 282 has a first insertion portion 291, an enlarged diameter portion 292, and a second insertion portion 293.

  The end of the pipe 81 is inserted inside the first insertion portion 291. A step is formed on the inner peripheral surface 291a of the first insertion portion 291. The upstream inner peripheral surface 291a1 of the inner peripheral surface 291a is arranged on the radially outer peripheral side of the downstream inner peripheral surface 291a2 of the inner peripheral surface 291a1. A wall 291b is formed to connect the inner peripheral surface 291a1 and the inner peripheral surface 291a2. The wall 291b is formed substantially perpendicular to the axis of the first insertion portion 291 (coinciding with the pipe axis 81o of the pipe 81). The tip of the inserted pipe 81 contacts the wall 291b. The inner peripheral surface 291a2 is located substantially on the same plane as the inner peripheral surface 81a of the pipe 81.

  The enlarged diameter portion 292 is enlarged over the entire circumference in a sectional view passing through the pipe shaft 81o of the pipe 81. The upper end 292b of the inner peripheral surface 292a of the enlarged diameter portion 292 in a cross-sectional view is formed so as to be inclined upward such that the height increases toward the downstream, and the lower end 292c decreases toward the downstream. It is formed so as to be inclined downward. A connection portion 294 between the first insertion portion 291 and the enlarged diameter portion 292 is shown.

  The end of the pipe 83 is inserted inside the second insertion portion 293. The first insertion portion 291 is provided concentrically with the second insertion portion 293. The axis of the first insertion section 91 (coinciding with the pipe axis 81o of the pipe 81) is arranged coaxially with the axis of the second insertion section 93 (coinciding with the pipe axis 83o of the pipe 83). A wall 293b is formed at an end of the inner peripheral surface 293a of the second insertion portion 293 on the side of the enlarged diameter portion 292. The end 292ae of the inner peripheral surface 292a of the enlarged diameter portion 292 on the side of the second insertion portion 293 is disposed radially inward of the inner peripheral surface 293a, and the wall 293b extends between the end 292ae and the inner peripheral surface 293a. It is formed so as to connect the ends on the diameter portion 292 side. The wall 293b is formed substantially perpendicular to the axis of the first insertion portion 291 (coinciding with the pipe axis 81o of the pipe 81). The tip of the inserted pipe 83 contacts the wall 291b. The radial height of the wall 293b substantially matches the thickness of the pipe 83, and the radial position of the end 292ae and the inner peripheral surface 83a of the pipe 83 substantially matches. In the present embodiment, the enlarged diameter portion 292 is defined from the connection portion 294 to the end 292ae of the eccentric increaser 182 in the lateral direction.

  Here, the angle θ1 formed between the extension line M1 of the lower end 81c in the cross-sectional view of the inner peripheral surface 81a of the pipe 81 and the lower end 292c of the inner peripheral surface 292a of the enlarged diameter portion 292 in the cross-sectional view is 20 °. ≤ θ1 ≤ 50 °.

(4. Example)
Next, the rainwater drainage device 10 of the present invention will be described in more detail using an embodiment.

  In the following examples and comparative examples, the flow velocity was evaluated based on differences in the size of the diameter expansion, the number of diameter expansions, and the presence or absence of the R shape in the connection portion 94 in the drainage section 16. As for the evaluation of the flow velocity, five pieces of black cloth with a diameter of 50 mm were flown, the time during which the cloth flowed over a certain distance immediately after the diameter was increased to the maximum diameter was measured, and the average flow velocity during that time was calculated. Here, in order to accurately measure the flow velocity, the flow velocity was calculated by photographing with a video camera and measuring the passage time. The flow rate was confirmed to be good when the flow velocity was 4.0 ms or less and was not good when the flow velocity was higher than 4.0 m / s.

FIG. 12 is a table showing the results of Examples 1 to 7 and Comparative Examples 1 to 6.
(Example 1)
In Example 1, the rainwater drainage device 10 having the configuration of Embodiment 1 described above was used. In the rainwater drainage device 10, the length L1 (see FIG. 4) of the vertical pipe section 13 is 0.6 m, the length L2 of the horizontal pipe section 14 is 1.5 m, and the length L3 of the vertical pipe section 15 is 21 m. The distance from the vertical pipe section 15 of the inlet pipe section 71 to the end 92ae of the enlarged diameter section 92 (the end on the upstream side of the pipe 83) is L4, and the drainage mass 72 extends from the end 92ae of the enlarged diameter section 92 of the inlet pipe section 71. The length L5 up to 9 m was set to 9 m.

  In addition, a pipe having a nominal diameter of 75A was used as the pipe 61 of the vertical pipe section 15, a pipe having a nominal diameter of 75A was used as the pipe 81, and a pipe having a nominal diameter of 100A was used as the pipe 83. Further, θ1 in the eccentric increaser 82 was set to 30 °.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 20 L / s, the flow velocity downstream of the enlarged diameter portion 92 was as good as 2.6 m / s.

(Example 2)
In Example 2, the same rainwater drainage device was used as in Example 1 except that θ1 was changed to 20 °.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 20 L / s, the flow velocity downstream of the enlarged diameter portion 92 was as good as 2.4 m / s.

(Example 3)
In Example 3, the same rainwater drainage device was used as in Example 1, except that θ1 was changed to 50 °.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 20 L / s, the flow velocity downstream of the enlarged diameter portion 92 was as good as 3.0 m / s.

(Example 4)
In Example 3, the same rainwater drainage device as in Example 2 was used.

  In the rainwater drainage device having such a configuration, when water was flowed from the inflow port 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 92 was as good as 4.0 m / s.

(Example 5)
In Example 5, the rainwater drainage device 10 having the configuration including the inlet pipe part 171 of Embodiment 2 described above was used.

  The length L1 (see FIG. 5) of the vertical pipe section 13 in the rainwater drainage device 10 is 0.6 m, the length L2 of the horizontal pulling pipe section 14 is 1.5 m, and the length L3 of the vertical pipe section 15 is 21 m. The distance L4 from the vertical pipe section 15 of the inlet pipe section 71 to the end 92ae of the enlarged diameter section 92 (the end on the upstream side of the pipe 83) is 1 m. The length L5 up to 72 was 9 m. The length from the end 92ae of the enlarged diameter portion 92 to the end 192ae of the enlarged diameter portion 192 was 0.5 m, and the length from the end 192ae of the enlarged diameter portion 192 to the drainage mass 72 was 8.5 m.

  Also, a pipe having a nominal diameter of 75A is used for the pipe 61 of the vertical pipe section 15, a pipe having a nominal diameter of 75A is used for the pipe 81, a pipe having a nominal diameter of 100A is used for the pipe 83, and a pipe having a nominal diameter of 150A is used for the pipe 183. Using. Further, θ1 in the eccentric increaser 82 was set to 40 °, and θ2 in the eccentric increaser 182 was set to 40 °.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 192 was as good as 3.3 m / s.

(Example 6)
In the sixth embodiment, a rainwater drainage device 10 that is different from the fifth embodiment in that an R-shape is formed in the enlarged diameter portion is used. FIG. 13 shows a side sectional view, an enlarged view of a T section, and an enlarged view of a W section showing an inlet pipe portion 171 ′ in which an R shape is formed in the connection portion 94 ′ and the connection portion 194 ′. An R-shape is formed at a connection portion 94 'of the enlarged diameter portion 92' of the eccentric increaser 82 of FIG. Further, an R-shape is formed at the connection portion 194 ′ of the eccentric increaser 182.

R has a radius of curvature of 35 mm.
In the rainwater drainage device having such a configuration, when water was flowed from the inflow port 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 192 ′ was as good as 2.6 m / s.

(Example 7)
In the seventh embodiment, as compared with the sixth embodiment, the angle θ1 and the angle θ2 are set to 20 °, and the rainwater drainage device 10 is different in that a pipe having a nominal diameter of 125 A is used for the pipe 183.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 192 was as good as 2.4 m / s.

(Example 8)
In the eighth embodiment, the length from the end 92ae of the enlarged diameter portion 92 to the end 192ae of the enlarged diameter portion 192 is 2.0 m, and the length from the end 192ae of the enlarged diameter portion 192 to the drainage mass 72 is different from that of the seventh embodiment. Used was a rainwater drainage device 10 that was different in that the length was 7.0 m.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 192 was as good as 2.1 m / s.

(Example 9)
In Example 9, the rainwater drainage device 10 having the configuration of Embodiment 3 described above was used. The length L1 (see FIG. 5) of the vertical pipe section 13 in the rainwater drainage device 10 is 0.6 m, the length L2 of the horizontal pulling pipe section 14 is 1.5 m, and the length L3 of the vertical pipe section 15 is 21 m. The distance L4 from the vertical pipe section 15 of the inlet pipe section 71 to the end 292ae of the enlarged diameter section 292 (the end on the upstream side of the pipe 83) is 1 m, and the drainage mass from the end 292ae of the enlarged diameter section 292 of the inlet pipe section 271 The length L5 up to 72 was 9 m.

  In addition, a pipe having a nominal diameter of 75A was used as the pipe 61 of the vertical pipe section 15, a pipe having a nominal diameter of 75A was used as the pipe 81, and a pipe having a nominal diameter of 100A was used as the pipe 83. Further, θ1 in the increaser 282 was set to 20 °.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 20 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 3.5 m / s, which was good.

(Comparative Example 1)
In Comparative Example 1, a rainwater drainage device in which θ1 was set to 60 ° was used as compared with Example 1.

  In the rainwater drainage device having such a configuration, when water was flowed from the inflow port 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 6.0 m / s, which was not a good result.

(Comparative Example 2)
Comparative Example 2 used a rainwater drainage device that differs from Example 1 in that θ1 was set to 60 ° and an R shape having a radius of curvature of 35 mm was formed in the connection portion 94.

  In the rainwater drainage device having such a configuration, when water was flowed from the inflow port 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 6.0 m / s, which was not a good result.

(Comparative Example 3)
In Comparative Example 3, a rainwater drainage device in which θ1 was set to 60 ° as compared with Example 9 was used.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 7.5 m / s, which was not a good result.

(Comparative Example 4)
In Comparative Example 4, a rainwater drainage device having a configuration in which the eccentric increaser 82 and the pipe 83 were not provided and the pipe 81 connected the elbow joint 62 and the drainage mass 72 was used as compared with Example 1.

  In the rainwater drainage device having such a configuration, when water was flowed from the inlet 11 at a flow rate of 20 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 70 m / s, which was not a good result.

(Comparative Example 5)
In Comparative Example 5, the same rainwater drainage device as in Comparative Example 4 was used.

  In the rainwater drainage device having such a configuration, when water was flowed from the inflow port 11 at a flow rate of 30 L / s, the flow velocity downstream of the enlarged diameter portion 92 was 9.0 m / s, which was not a good result.

(Comparative Example 6)
In Comparative Example 6, a rainwater drainage device in which θ1 was set to 60 ° was used as compared with Example 1.

  In the rainwater drainage device having such a configuration, when water flows from the inlet 11 at the same flow rate of 20 L / s as in the first embodiment, the flow velocity downstream of the enlarged diameter portion 92 is 4.9 m / s, which is not a good result. Was.

(5. Features etc.)
(1)
The rainwater drainage device 10 of the present embodiment includes an inflow port 11, a drainage mass 72, and inlet pipe sections 71, 171, 271 (an example of a drainage pipe section). . Rainwater flowing into the inflow port 11 flows into the drainage mass 72. The inlet pipe sections 71, 171, 171 ′, and 271 are arranged on the upstream side of the drainage mass 72 along the lateral direction and are connected to the drainage mass 72. The inlet pipe sections 71, 171, 171 ', and 271 include enlarged diameter sections 92, 92', and 292 (an example of a first enlarged section), a pipe 81 (an example of a first pipe section), and a pipe 83 (an example of a second enlarged section). An example of a pipe section). The enlarged diameter portions 92, 92 ′, and 292 are arranged on the downstream side of the pipe 81, and expand at least at the lower end side in a cross-sectional view including the pipe shaft 81 o of the pipe 81. The pipe 83 is disposed downstream of the enlarged diameter portions 92, 92 ', 292. In a cross-sectional view, the angle θ1 formed by the extension line M1 of the lower end 81c of the pipe 81 and the lower ends 92c, 292c of the enlarged diameter portions 92, 92 ′, 292 is not less than 20 ° and not more than 50 °.

  Thus, even when a large amount of rainwater flows into the drainage mass 72, the rainwater gradually moves along the lower ends of the enlarged diameter portions 92, 92 ', 292 of the inlet pipes 71, 171, 171', 271. Since the diameter is enlarged, the flow velocity is reduced, and the splash of water from the drainage mass 72 can be reduced.

  It should be noted that the “lateral direction” is not strictly meaningful, but may be any range that can be recognized as a horizontal direction according to social wisdom, and includes an inclination.

(2)
In the rainwater drainage device 10 of the present embodiment, the cross-sectional area S1 of the pipe 81 (an example of the first pipe section) and the cross-sectional area S2 of the pipe 83 (an example of the second pipe section) are 1.3 ≦ S2 / S1. Satisfies ≦ 2.1.

  By setting the diameter expansion rate in an appropriate range, the flow velocity can be effectively reduced.

(3)
In the rainwater drainage device 10 according to the present embodiment, at least the pipe shaft 81o of the pipe 81 is located between the pipe 81 (an example of the first pipe section) and the enlarged diameter section 92 '(an example of the first enlarged section). An R shape is formed on the lower side.

  Accordingly, it is considered that the rainwater smoothly flows from the pipe 81 toward the enlarged-diameter portion 92 ′, so that the resistance to the inner surface of the pipe increases, and the flow velocity can be reduced.

(4)
In the rainwater drainage device 10 of the present embodiment, the height of the upper end 81b of the pipe 81 (an example of the first pipe section) and the upper end 83b of the pipe 83 (an example of the second pipe section) match in a sectional view. The enlarged diameter portions 92 and 92 'are eccentrically enlarged.

  Thus, the flow rate of rainwater can be reduced by the resistance of the enlarged diameter portions 92 and 92 '.

  It should be noted that the term “match” does not have a strict meaning, and it is sufficient that they match based on social wisdom, and include errors and inclinations.

(5)
The rainwater drainage device 10 of the present embodiment further includes a vertical piping unit 15. The vertical pipe section 15 is arranged along the vertical direction. The inlet pipe sections 71, 171, 171 ′, and 271 (an example of a drain pipe section) are arranged between the lower end of the vertical pipe section 15 and the drain mass 72.

  Accordingly, by disposing the inlet pipes 71, 171, 171 ', and 271 (an example of the drainage pipe) provided with the enlarged diameter portions 92, 92', 292 between the vertical pipe portion 15 and the drainage mass 72, It is possible to reduce the flow rate of the rainwater increased in the vertical pipe section 15 and then supply the rainwater to the drainage mass 72.

  Further, the “vertical direction” in the present specification does not have a strict meaning, and may be any range that can be recognized as a vertical direction in accordance with social wisdom, and includes an inclination.

(6)
In the rainwater drainage device 10 of the present embodiment, the nominal diameter of the vertical pipe section 15 is 75 A or more.

  The flow rate of rainwater falling from the vertical pipe section 15 of 75 A or more can be reduced and then supplied to the drainage mass 72.

(7)
In the rainwater drainage device 10 according to the present embodiment, the vertical pipe section 15 has a design flow rate of 15 L / s or more.

  As described above, even when a large amount of rainwater flows in the vertical pipe section 15 having the design flow rate of 15 L / s or more, the flow velocity can be reduced and the splash of water from the drainage mass 72 can be reduced.

(8)
In the rainwater drainage device 10 according to the present embodiment, the inlet pipe sections 171 and 171 ′ (an example of a drain pipe section) include enlarged diameter sections 192 and 192 ′ (an example of a second enlarged section) and a pipe 183 (third enlarged section). An example of a pipe section). The enlarged diameter portions 192, 192 'are arranged on the downstream side of the pipe 83 (an example of the second piping section), and are enlarged at least at the lower end side. The pipe 183 is disposed downstream of the enlarged diameter portions 192, 192 '. In a cross-sectional view, the angle θ2 formed by the extension line M2 of the lower end 83c of the pipe 83 and the lower end 192c of the enlarged diameter portions 192, 192 ′ is not less than 20 ° and not more than 50 °.

Thus, by providing a plurality of enlarged diameter portions, the flow velocity can be reduced.
(9)
The rainwater drainage device 10 of the present embodiment further includes a siphon induction unit 12. The siphon induction part 12 is arrange | positioned at the inflow port 11, and induces a siphon phenomenon.

  Thereby, even when a siphon phenomenon occurs due to the siphon inducing section 12 and a large amount of rainwater flows into the drainage mass, the flow velocity is reduced at the inlet pipe sections 71, 171, 171 ', and 271 (an example of the drainage pipe section). Therefore, splashing of water from the drainage mass 72 can be reduced.

(6. Other embodiments)
As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention.

(A)
In FIG. 11, the rainwater drainage device using one concentric increaser 282 has been described. However, the present invention is not limited to this, and a configuration including a plurality of concentric increasers may be used.
Further, a concentric increaser and an eccentric increaser may be mixed.

(B)
In the rainwater drainage device 10 of the above-described embodiment, the outlet pipe portion 73 is connected to the drainage mass 72 so as to face the inlet pipe portion 71. However, the present invention is not limited thereto, and the inlet pipe portion 71 is connected. The outlet pipe portion 73 may be connected to a side surface adjacent to the side surface.

(C)
In the rainwater drainage device 10 of the above embodiment, the drainage mass 72 has a rectangular parallelepiped shape, but is not limited thereto, and may have, for example, a columnar shape.

(D)
In the rainwater drainage system 1 of the above embodiment, three rainwater drainage devices 10 are arranged on the side surface 103 side, but the number is not limited to this.

(E)
In the above embodiment, one set of the inlet 11, the siphon inducer 12, and the vertical pipe 13 is provided in one rainwater drainage device 10, but a plurality of sets may be provided. In this case, the lower ends of the plurality of sets of the vertical pipe sections 13 are connected to the horizontal pulling pipe section 14, and the rainwater flows from the multiple inlets 11.

(F)
In the above embodiment, the rainwater drainage device 10 is provided only on the two opposing side surfaces 103 and 104, but may be provided near all four side surfaces.

(G)
In the rainwater drainage device 10 according to the above-described embodiment, a pipe whose cross section perpendicular to the flow path direction (flow path cross section) is circular is not limited to a circular shape, but may be an elliptical shape, a square shape, or the like. There may be.

(H)
In the rainwater drainage device 10 of the above-described embodiment, the inner diameter of the pipe in the upright pipe section 15 is the same, but a reduced diameter section is provided in the middle of the upright pipe section 15, and The cross-sectional area may be smaller. Thereby, the momentum of the rainwater can be reduced, and the collision sound of water at the lower end of the vertical pipe section 15 and the drainage mass 72 can be reduced.

(I)
In the above embodiment, the rainwater drainage device 10 is disposed indoors of the building 100, but is not limited thereto, and may be disposed outdoors.

  ADVANTAGE OF THE INVENTION According to the rainwater drainage device of this invention, it has the effect which can reduce the splash of water from a drainage mass, and can be utilized as various drainage devices.

10: Rainwater drainage device 11: Inlet 12: Siphon induction part 71: Inlet piping part 72: Drainage mass 81: Piping 81c: Lower end 81o: Pipe shaft 83: Piping 92: Expanding part 92c: Lower end

Claims (9)

A rainwater drainage device for draining rainwater,
An inlet for rainwater,
A drainage mass into which the rainwater flowing into the inlet flows,
A drainage pipe portion disposed on the upstream side of the drainage mass along the lateral direction and connected to the drainage mass,
The drainage pipe section,
A first piping section;
A first enlarged portion that is arranged on the downstream side of the first piping portion and that expands in diameter at least at a lower end side in a cross-sectional view including a tube axis of the first piping portion;
And a second piping portion disposed downstream of the first enlarged diameter portion.
In the cross-sectional view, an angle θ1 formed by an extension of a lower end of the first pipe portion and a lower end of the first enlarged diameter portion is not less than 20 ° and not more than 50 °.
Rainwater drainage. The cross-sectional area S1 of the first pipe section and the cross-sectional area S2 of the second pipe section are
Satisfies 1.3 ≦ S2 / S1 ≦ 2.1,
The rainwater drainage device according to claim 1. An R shape is formed between the first pipe portion and the first enlarged diameter portion at least below the pipe axis of the first pipe portion,
The rainwater drainage device according to claim 1. In the cross-sectional view, the height of the upper end of the first pipe portion and the height of the upper end of the second pipe portion match,
The first enlarged diameter portion is eccentrically enlarged.
The rainwater drainage device according to claim 1. It further comprises a vertical pipe section arranged along the vertical direction,
The drainage pipe is disposed between a lower end of the standing pipe and the drainage mass,
The rainwater drainage device according to claim 1. The nominal diameter of the vertical pipe portion is 75A or more.
The rainwater drainage device according to claim 5. The vertical pipe section has a design flow rate of 15 L / s or more.
The rainwater drainage device according to claim 5. The drainage pipe section,
A second enlarged-diameter portion that is arranged downstream of the second pipe portion and that expands in diameter at least at a lower end side in the cross-sectional view;
And a third piping portion disposed downstream of the second enlarged diameter portion.
In the cross-sectional view, the angle θ2 formed by the extension of the lower end of the second pipe portion and the lower end of the second enlarged-diameter portion is not less than 20 ° and not more than 50 °.
The rainwater drainage device according to claim 1. The apparatus further comprises a siphon inducing section disposed at the inflow port to induce a siphon phenomenon.
The rainwater drainage device according to any one of claims 1 to 8.

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