Rainwater drainage device, rainwater drainage system, roof, building, and pipe

Abstract

To provide a rainwater drainage device capable of effectively generating a siphoning phenomenon in a water distribution pipe and efficiently draining rainwater by eliminating factors that inhibit the generation of the siphoning phenomenon.SOLUTION: A rainwater drainage device 10 includes a base portion 11, a lid portion 12, and a plurality of straightening fins 13. The base portion 11 has a bottom surface 11a and a drop port 11b through which rainwater falls at approximately the center of the bottom surface 11a, and the drop port 11b is connected to a roof drain 21. The lid portion 12 is disposed above the drop port 11b of the base portion 11 with a predetermined gap from the bottom surface 11a. The plurality of straightening fins 13 are disposed on the outer periphery of the bottom surface of the base portion 11, straighten the flow of rainwater flowing into the drop port 11b, and are disposed along the radial direction of a virtual circle inscribed in the surface of the lid portion 12 facing the drop port 11b, with their outer peripheral ends protruding from the outer edge of the lid portion 12.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rainwater drainage device and a rainwater drainage system for collecting and draining rainwater. , roofs, buildings, pipes Regarding. [Background technology]

[0002] In recent years, the frequency of torrential rain has increased, and the need for efficient drainage of rainwater from roofs of buildings has become a necessity. In order to meet these demands, storm water pipes are becoming larger.

[0003] In response to this, the siphon effect can be used to reduce the diameter of rainwater pipes and the number of rainwater standpipes. Stormwater drainage measures are used that allow for a reduction in

[0004] For example, Patent Document 1 describes a method for efficiently collecting large amounts of rainwater by using a siphon effect during heavy rain. A siphon-type rainwater drainage system that allows efficient drainage without increasing costs or damaging the appearance of the house. The placement is disclosed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-308399 A (Patent No. 4130616 A) Summary of the Invention [Problem to be solved by the invention]

[0006] However, the above-mentioned conventional rainwater drainage system has the following problems. That is, in the rainwater drainage system disclosed in the above publication, the bottom of the water collection pipe attached to the eaves In the section, a 3 to 13 cm2 opening area is installed vertically along the exterior wall material of the house. The upper end of the phono tube is connected.

[0007] This configuration allows rainwater to be efficiently drained by the siphon effect. However, depending on how rainwater flows into the siphon pipe, the inside of the pipe may be filled with water. Rainwater cannot form a vortex in the pipe, and an air column forms in the center of the rainwater that flows into the pipe. This may result in a decrease in the efficiency of drainage.

[0008] The object of the present invention is to effectively generate a siphon phenomenon in a drain pipe and to A rainwater drainage system that can efficiently drain rainwater by eliminating factors that inhibit the occurrence of the rainwater phenomenon. To provide a water drainage device. [Means for solving the problem]

[0009] The rainwater drainage device according to the first invention is a rainwater drainage device that collects rainwater and drains it from a drain pipe. The base portion has a bottom surface and a cover portion. The base portion is connected to the drain pipe. The lid is disposed opposite the drop opening and with a predetermined gap from the bottom surface. If the size of the gap is h and the inner diameter of the drop hole is a, the following relational expression (1) is satisfied. In addition, the size of the gap h is 20 mm or more. 0.22≦h / a≦0.37 (1)

[0010] The rainwater drainage device according to the second invention is the rainwater drainage device according to the first invention, further comprising a base part A plurality of fillets are arranged on the outer periphery of the bottom surface of the It has

[0011] A rainwater drainage system according to a third aspect of the present invention is the rainwater drainage system according to the first or second aspect of the present invention. The fins are arranged along the radial direction of a virtual circle inscribed on the surface of the lid, and the outer peripheral end of the fin protrudes from the outer edge of the lid.

[0012] A rainwater drainage device according to a fourth aspect of the present invention is a rainwater drainage device according to any one of the first to third aspects of the present invention. The device has a gap size h of 15 mm or more and 40 mm or less.

[0013] A storm water drainage system according to a fifth aspect of the present invention is a storm water drainage system according to any one of the first to fourth aspects of the present invention. The rainwater drainage system includes a drainage device, a water collection pipe connected to the rainwater drainage device, and a drain outlet connected to the water collection pipe. is. Effect of the Invention

[0014] According to the rainwater drainage device of the present invention, the siphon phenomenon is effectively generated in the drainage pipe. At the same time, it eliminates factors that hinder the occurrence of the siphon phenomenon, allowing rainwater to be drained efficiently. It is possible. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a drainage system including a storm water drainage device according to an embodiment of the present invention. [Diagram 2] (a) is a cross-sectional view of the storm water drainage device of FIG. 1, and (b) is its plan view. [Diagram 3] FIG. 13 is a diagram showing the results of comparing Examples 1 to 7 of the present invention with Comparative Examples 1 to 4 with respect to the occurrence of vortexes and siphoning. [Figure 4] 1A is a side view showing the configuration of a rainwater drainage device according to another embodiment of the present invention, and FIG. 1B is a plan view showing the configuration of a rainwater drainage device according to still another embodiment of the present invention. [Diagram 5] 1A is a side view showing the configuration of a rainwater drainage device according to still another embodiment of the present invention, and FIG. 1B is a side view showing the configuration of a rainwater drainage device according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A rainwater drainage device 10 according to one embodiment of the present invention will be described with reference to Figs. 1 to 2(b). This gives the following:

[0017] As shown in FIG. 1, the rainwater drainage device 10 is a rainwater drainage system 5 installed in a building 30. It forms part of 0.

[0018] The building 30 shown in FIG. 1 is a three-story building, and the space between the first and second floors, the space between the second floor and There are 20 slabs between the upper and lower floors.

[0019] (Rainwater drainage system 50) As shown in FIG. 1, the rainwater drainage system 50 includes a rainwater drainage device 10 and a roof drain 21. (part of the drain pipe), a water collection pipe 22, and a drain outlet 23.

[0020] The roof drain 21 drains rainwater that falls on a flat roof of a structure 30 such as a building into a drainage pipe 22. The roof drain 21 is provided for the purpose of draining the building 3 as shown in FIG. They are installed in a total of six places along the roof of 0, three on each side.

[0021] The roof drain 21 is, for example, a pipe having an outer diameter of 50A and a circular cross section. The water collecting pipe 22 may be connected to the water collecting pipe 22 via a pipe having an outer diameter of 65A.

[0022] The water collection pipe 22 collects the rainwater drained from each roof drain 21 and guides it to the drain outlet 23. The water collection pipe 22 is provided on the flat roof of the building 30 as shown in FIG. , and is arranged so as to slope downward toward the connection side with the drain pipe 14. Furthermore, the water collection pipe 22 is connected to the drain pipe 14 at the downstream end in the direction of rainwater movement. It has been done.

[0023] The water collection pipe 22 may be, for example, a member having a circular or elliptical cross-sectional shape. can be done.

[0024] As shown in FIG. 1, the drain outlet 23 is connected to the most downstream side of the drain pipe 14 and is a roofed Rainwater collected through the lens 21 is drained near the ground.

[0025] The drain outlet 23 is, for example, a pipe having an outer diameter of 100A to 150A and a circular cross section. It is placed at the connection part with the drain pipe 14 and has an outer diameter of 100A. The pipe is combined with a pipe with an outer diameter of 150A that is located at the end of the drainage side. Good too.

[0026] (Rainwater drainage system 10) As shown in FIG. 1, the rainwater drainage device 10 is disposed directly above each roof drain 21. .

[0027] The material of the rainwater drainage device 10 is, like the drainage pipe 14, for example, PE (polyethylene Polyethylene (PE) and PP (polypropylene) and other olefin-based resins, PVC resins, or aluminum Metals such as aluminum, aluminum alloys, and stainless steel can be used.

[0028] By using resin, aluminum, and aluminum alloys, it is possible to achieve light weight, low cost, and It is possible to obtain a rainwater drainage device 10 having a desired shape.

[0029] As shown in FIG. 2( a ) and FIG. 2( b ), the base portion 11 has a circular bottom surface 11 a and The bottom surface 11a has a drop hole 11b for dropping rainwater at the approximate center, and a cylindrical portion 11c. The cylindrical portion 11c forming the drop opening 11b is connected to the upper end of the roof drain 21. can be.

[0030] As shown in FIG. 2(a) and FIG. 2(b), the bottom surface 11a has a drop hole 11 at the approximate center. The bottom surface 11a of the annular member is provided with a drop hole 11b. A plurality of flow straightening fins 13 are arranged at equal angular intervals around the center.

[0031] As shown in FIG. 2(a), the drop hole 11b is a through hole formed in the center of the base portion 11. The hole is formed inside the cylindrical portion 11c. The rainwater drainage device 10 is connected to the upper end of the drain 21, and the rainwater flows into the rainwater drainage device 10 from 360 degrees. The rainwater that falls into the roof drain 21 is allowed to fall.

[0032] As shown in FIG. 2(a) and FIG. 2(b), the cylindrical portion 11c is a cylindrical member. The upper end of the plate is connected to the bottom surface 11a and protrudes downward from the bottom surface 11a. The cylindrical portion 11c has an outlet 11b formed therein.

[0033] As shown in FIG. 2(a) and FIG. 2(b), the cover portion 12 is disposed above the base portion 11. The plate-like member is arranged concentrically with the drop hole 11b formed at the center of the base portion 11. The airflow is supported by a plurality of airflow straightening fins 13 standing on the bottom surface 11a of the base portion 11. As shown in FIG. 2(a), the cover portion 12 is disposed on the base portion 11 (the drop opening 11b). It is disposed above the bottom surface 11a with a predetermined gap G (height) h therebetween. Furthermore, the lid portion 12 has a circular surface facing the drop hole 11b with a diameter b (the diameter of the circular surface inscribed in the surface of the lid portion 12). The diameter of the imaginary circle is the same as that of the axial direction.

[0034] In this embodiment, since the lid portion 12 is a circular plate-like member, the diameter of the inscribed circle of the lid portion 12 is The diameter b corresponds directly to the diameter of the circular lid portion 12.

[0035] As shown in FIG. 2(a) and FIG. 2(b), the plurality of flow straightening fins 13 are disposed at the drop holes 11b. It is provided on the bottom surface 11a of the base portion 11 in order to regulate the flow of rainwater flowing into the drainpipe 11a. More specifically, the plurality of flow straightening fins 13 are arranged in a substantially vertical direction as shown in FIG. The plate-like member is arranged on the bottom surface 11a, and a circle having a drop hole 11b as a center is formed on the bottom surface 11a. There are eight of them spaced equally around the circumference.

[0036] The eight flow straightening fins 13 are arranged in a radial direction on the annular bottom surface 11a. They are arranged in such a way that As a result, as shown in FIG. 2(b), the gap between the bottom surface 11a of the base portion 11 and the lid portion 12 Even if the rainwater that flows into the gap G enters in a vortex shape (see the dashed line in the figure), the straightening filter The rainwater is rectified by the drain 13 and guided toward the center of the drain outlet 11b. can.

[0037] As a result, rainwater flows into the roof drain 21 in a vortex shape, forming an air column in the center. This can prevent the data from being leaked.

[0038] As a result, the straightening fins 13 direct air to the center of the rainwater flowing into the drop port 11b. By preventing the formation of columns, the siphon phenomenon occurring in the roof drain 21 is prevented. It can effectively eliminate the factors that inhibit the occurrence of elephants.

[0039] <Relationship between base portion 11 and lid portion 12> In the rainwater drainage device 10 of this embodiment, in the above-mentioned configuration, the drop port of the base part 11 If the diameter of the circular lid portion 12 facing 11b is b and the size (height) of the predetermined gap G is h, then It is configured to satisfy the following relational expression (1).

[0040] 6≦b / h≦11 (1) In this way, the diameter b of the lid portion 12 and the gap between the bottom surface 11a of the base portion 11 and the lid portion 12 The relationship between the magnitude of G and the magnitude of h satisfies the relational expression (1), so that the base portion 1 1 and the lid portion 12 through the drop hole 11b into the roof drain 21. The flow rate of rainwater is controlled so that the inside of the roof drain 21 is filled to capacity. You can install it.

[0041] As a result, the siphon phenomenon is effectively generated within the roof drain 21. By eliminating factors that inhibit the siphon phenomenon, rainwater can be efficiently drained. do.

[0042] Furthermore, if the inner diameter of the drop opening 11b of the base portion 11 is a, the following relational expression (2) is satisfied. The system is configured to:

[0043] 0.2≦h / a≦0.5 (2) In this way, the gap G between the bottom surface 11a of the base portion 11 and the lid portion 12 is The ratio of the inner diameter a of the drop opening 11b is configured to satisfy the relational expression (2), The roof drain 2 is inserted through the drop hole 11b between the bottom surface 11a of the base portion 11 and the lid portion 12. The flow rate of rainwater falling onto the roof drain 21 is stabilized, and the inside of the roof drain 21 is kept in a full flow state. It can be controlled to be in that state.

[0044] As a result, the siphon phenomenon is effectively generated within the roof drain 21. By eliminating factors that inhibit the siphon phenomenon, rainwater can be efficiently drained. do.

[0045] Here, a predetermined gap is formed between the bottom surface 11a of the base portion 11 and the cover portion 12. The size (height) h of G must be greater than or equal to 15 mm and less than or equal to 40 mm while satisfying the above relational expression (1). It is preferable that the value is set to be within the range of

[0046] As a result, the bottom surface 11a of the base portion 11 and the lid portion 12 are dropped into the gap through the drop hole 11b. By restricting the flow rate of rainwater falling into the roof drain 21 in the vertical direction, It is possible to control the inside of the full drain 21 so that it becomes a full flow state.

[0047] As a result, the flow rate of rainwater flowing into the roof drain 21 can be controlled more effectively. As a result, the occurrence of a siphon phenomenon in the roof drain 21 can be induced.

[0048] Furthermore, the diameter b (diameter of the imaginary circle) of the circular lid portion 12 described above satisfies the above relational expression (1). After taking into account the above, the setting must be within the range of 110 mm to 155 mm. preferable.

[0049] As a result, the bottom surface 11a of the base portion 11 and the lid portion 12 are dropped into the gap through the drop hole 11b. The flow rate of rainwater falling into the roof drain 21 is restricted in the planar direction of the lid portion 12. This allows the roof drain 21 to be controlled so that it is filled to capacity. can.

[0050] As a result, the flow rate of rainwater flowing into the roof drain 21 can be controlled more effectively. This can induce the occurrence of a siphon phenomenon within the roof drain 21. <Comparison of Examples 1 to 4, Reference Examples 1 to 3, and Comparative Examples 1 to 4> FIG. 3 shows Examples 1 to 4 of the present invention, Reference Examples 1, 2, and 3, and Comparative Examples 1 to 4, with a roof drain. Whether or not vortexes occur when rainwater flows into the roof drain 21, and the siphon phenomenon in the roof drain 21 The results of the comparison from the viewpoint of the occurrence or non-occurrence of the above are shown below.

[0051] In the reference example 1, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 53.5 mm, and the cover portion 12 The experimental results are shown below for a height of 15 mm (size of gap G) and a diameter of 150 mm. is doing.

[0052] In this case, b / h=10.0, h / a=0.28, and the outlet of the roof drain 21 When the diameter is 50A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0053] As a result, according to the rainwater drainage device 10 of Reference Example 1, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. EXAMPLES

[0054] In the first embodiment, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 71 mm, and the height of the cover portion 12 is The experimental results are shown below for a gap length (gap G size h) of 20 mm and a lid diameter b of 190 mm. There are.

[0055] In this case, b / h=9.5, h / a=0.28, and the diameter of the roof drain 21 At 75A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0056] As a result, according to the rainwater drainage device 10 of the first embodiment, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. EXAMPLES

[0057] In the second embodiment, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 109 mm, and the The experimental results are shown below for height (gap G size h) = 40 mm and lid diameter b = 300 mm. is.

[0058] In this case, b / h=7.5, h / a=0.37, and the diameter of the roof drain 21 At 100A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0059] As a result, according to the rainwater drainage device 10 of the second embodiment, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. Reference Example 2

[0060] In the reference example 2, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 53.5 mm, and the cover portion 12 The experimental results are shown below for a height of the cover (size of the gap G) of 19 mm and a diameter of the cover b of 150 mm. is doing.

[0061] In this case, b / h=7.9, h / a=0.36, and the diameter of the roof drain 21 At 50A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0062] As a result, according to the rainwater drainage device 10 of Reference Example 2, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. Reference Example 3

[0063] In the reference example 3, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 68 mm, and the height of the cover part 12 is The experimental results are shown below for a gap length (gap G size h) of 15 mm and a lid diameter b of 130 mm. There are.

[0064] In this case, b / h=8.7, h / a=0.22, and the diameter of the roof drain 21 At 65A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0065] As a result, according to the rainwater drainage device 10 of Reference Example 3, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. EXAMPLES

[0066] In the third embodiment, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 71 mm, and the height of the cover portion 12 is The experimental results are shown below for a gap length (gap G size h) of 25 mm and a lid diameter b of 220 mm. There are.

[0067] In this case, b / h=8.8, h / a=0.35, and the diameter of the roof drain 21 At 75A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0068] As a result, according to the rainwater drainage device 10 of the third embodiment, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. EXAMPLES

[0069] In the fourth embodiment, the inner diameter a of the drop port 11b of the rainwater drainage device 10 is 109 mm, and the The experimental results are shown below for height (gap G size h) = 30 mm and lid diameter b = 250 mm. is.

[0070] In this case, b / h=8.3, h / a=0.28, and the diameter of the roof drain 21 At 50A, no vortex occurs in the rainwater flowing into the roof drain 21 from the drop outlet 11b. The occurrence of the siphon phenomenon in the roof drain 21 was confirmed.

[0071] As a result, according to the rainwater drainage device 10 of the fourth embodiment, the rainwater flowing into the roof drain 21 The siphon effect allows rainwater to be efficiently drained without creating vortexes. Done. (Summary of Examples 1 to 4) As described above, according to the configurations of the first to fourth embodiments, in any case, the water flows into the roof drain 21. No vortexes are generated in the incoming rainwater, and the siphon effect allows the rainwater to be drained efficiently. It was possible to do so. Comparative Example 1

[0072] On the other hand, in Comparative Example 1, the inner diameter a of the drop port 11b of the rainwater drainage device was 53.5 mm, and the The experimental results are shown below for height (gap G size h) = 15 mm and lid diameter b = 60 mm. There are.

[0073] In this case, b / h = 4.0, h / a = 0.28, and the roof drain diameter is 50 At the time of A, a vortex was observed in the rainwater flowing into the roof drain from the outlet. There was no occurrence of siphoning in the drain pipes.

[0074] That is, in Comparative Example 1, among the parameters, b / h and h are the same as those in the above embodiment. This is outside the range specified by the IEC 61260.

[0075] As a result, according to the rainwater drainage device of Comparative Example 1, vortexes are generated in the rainwater flowing into the roof drain. Since the siphon phenomenon cannot occur due to the generation of water, rainwater can be efficiently drained. I was unable to do so.

[0076] Here, when comparing Comparative Example 1 with a comparative example similar to this configuration, the diameter b of the lid portion is different. It is clear that this is the case.

[0077] Therefore, although favorable results were obtained with respect to b / h at 10.0 in Comparative Example 1, In Comparative Example 1, which is 4.0 and does not satisfy the above relational expression (1), favorable results were not obtained.

[0078] In addition, although favorable results were obtained with the diameter b of the lid portion being 150 mm in Comparative Example 1, In the case of Comparative Example 1, 60 mm, the lid was too small to stabilize the amount of rainwater inflow, and No desirable results were obtained.

[0079] In Comparative Example 2, the inner diameter a of the drop port of the rainwater drainage device is 53.5 mm, and the height of the lid part (gap G The experimental results are shown for a size of the cover (h) = 50 mm and a diameter of the lid (b) = 250 mm.

[0080] In this case, b / h = 5.0, h / a = 0.93, and the roof drain diameter is 50 At the time of A, a vortex was observed in the rainwater flowing into the roof drain from the outlet. There was no occurrence of siphoning in the roof drain.

[0081] That is, in Comparative Example 2, among the parameters, b / h, h / a, h and b are all in the upper This is outside the range specified in the above embodiment.

[0082] As a result, according to the rainwater drainage device of Comparative Example 2, vortexes are generated in the rainwater flowing into the roof drain. Since the siphon phenomenon cannot occur due to the generation of water, rainwater can be efficiently drained. It was not possible to achieve this.

[0083] In Comparative Example 3, the inner diameter a of the drop port of the rainwater drainage device was 53.5 mm, and the height of the lid (gap G The experimental results are shown for a size of the nozzle h = 15 mm and a diameter of the lid b = 190 mm.

[0084] In this case, b / h = 12.7, h / a = 0.28, and the roof drain diameter is 5 At 0A, no vortex was observed in the rainwater flowing into the roof drain from the outlet. However, there was no occurrence of siphoning in the roof drain.

[0085] That is, in Comparative Example 3, among the parameters, b / h and b are the same as those in the above embodiment. This is outside the range specified by the IEC 61260.

[0086] As a result, according to the rainwater drainage device of Comparative Example 3, no vortexes are generated in the rainwater flowing into the roof drain. Although it does not generate siphoning, it does not efficiently drain rainwater. It was not possible to water it. Comparative Example 4

[0087] In Comparative Example 4, the inner diameter a of the drop port of the rainwater drainage device is 71 mm, the height of the lid part (the size of the gap G) is The experimental results are shown for a size h = 45 mm and a lid diameter b = 190 mm.

[0088] In this case, b / h = 4.2, h / a = 0.63, and the roof drain diameter is 75 At the time of A, a vortex was observed in the rainwater flowing into the roof drain from the outlet. There was no occurrence of siphoning in the roof drain.

[0089] That is, in Comparative Example 4, among the parameters, b / h, h / a, h and b are all in the upper This is outside the range specified in the above embodiment.

[0090] As a result, according to the rainwater drainage device of Comparative Example 4, vortexes are generated in the rainwater flowing into the roof drain. Since the siphon phenomenon cannot occur, rainwater is not efficiently collected. It was not possible to drain the water.

[0091] Here, when comparing Comparative Example 4 with Example 1 which has a similar configuration, h is different. It becomes clear that...

[0092] Therefore, regarding b / h, although favorable results were obtained at 9.5 in Example 1, In Comparative Example 4, 4.2, the position of the lid was too high, so the amount of rainwater entering the tub was not stabilized. No desirable results were obtained.

[0093] In addition, regarding the h / a ratio, a favorable result was obtained at 0.28 in Example 1, but Comparative Example 4, 0.63, did not give favorable results.

[0094] Furthermore, the size h of the gap G was 20 mm as in Example 1, and favorable results were obtained. However, favorable results were not obtained with the 45 mm lens of Comparative Example 4. (summary) (About b / h) As a result of the above Examples 1 to 4, the diameter b of the lid portion 12 and the height of the lid portion 12 (the size h of the gap G) If the ratio b / h is 7.5 or more and 10.0 or less, a vortex will form in the roof drain 21. It was possible to generate a siphon effect without any damage occurring.

[0095] On the other hand, as a result of the above Comparative Examples 1 to 4, when b / h is 5.0 or less and 12.7 or more, In the drain 21, no vortex or siphon phenomenon occurs. It was found that the drainage of rainwater was not efficient due to the above reasons.

[0096] Therefore, as described in the above embodiment, the following relational expression (1 ) is preferably set to satisfy

[0097] 7.5≦b / h≦10.0 (1) (About h / a) Next, as a result of the above Examples 1 to 4, the inner diameter a of the drop opening 11b and the height of the lid portion 12 (gap G If the ratio h / a of the size of the drain pipe 14 to the size of the drain pipe 14 is 0.22 or more and 0.37 or less, The siphon effect could be generated without the generation of vortexes.

[0098] On the other hand, as a result of the above Comparative Examples 1 to 4, when h / a is 0.28 or less and 0.63 or more, It was not possible to generate a vortex or a siphon phenomenon in the drain pipe 14. It was found that the drainage was so poor that rainwater could not be drained efficiently.

[0099] Therefore, as described in the above embodiment, the following relational expression (2 ) is preferably set to satisfy

[0100] 0.22≦h / a≦0.37 (2) (Regarding the size h of the gap G) Next, as a result of the above Examples 1 to 4, the size h of the gap G is 15 mm or more and 40 mm or less. m or less, no vortex will be generated in the roof drain 21, and the siphon phenomenon will be prevented. I was able to make it happen.

[0101] On the other hand, as a result of the above Comparative Examples 1 to 4, the size h of the gap G was 15 mm or less, 45 If the thickness exceeds 1 mm, a vortex may occur in the roof drain 21, causing a siphon phenomenon. It was found that rainwater could not be efficiently drained due to the inability to drain water. Ta.

[0102] Therefore, as explained in the above embodiment, the size h of the gap G is 15m It is preferable that the thickness is set in the range of 100 mm or more and 40 mm or less.

[0103] (For diameter b) Furthermore, as a result of the above Examples 1 to 4, the diameter b of the lid portion 12 is 130 mm or more and 3 If the diameter is less than 0.00 mm, no vortex will be generated in the drain pipe 14, and the siphon phenomenon will be prevented. I was able to make it happen.

[0104] On the other hand, as a result of the above Comparative Examples 1 to 4, the diameter b of the lid portion 12 was 60 mm or less, 19 If the thickness is more than 0 mm, a vortex or a siphon phenomenon will occur in the drain pipe 14. It was found that the drainage was not efficient and rainwater could not be drained efficiently.

[0105] Therefore, as described in the above embodiment, the diameter b of the lid portion 12 is 130 It is preferable that the distance is set in the range of 300 mm or more and 300 mm or less.

[0106] [Other embodiments] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. However, various modifications are possible without departing from the spirit and scope of the invention.

[0107] (A) In the above embodiment, the rainwater drainage device 10 is arranged along the outer periphery of the bottom surface 11a of the base portion 11. In the above description, an example in which a plurality of flow straightening fins 13 are provided radially has been given. However, the present invention does not include this. Not limited to this.

[0108] For example, as shown in FIG. 4(a), a flow straightening fin is provided on the bottom surface 11a of the base portion 11. The storm water drainage device 110 may be an uninsulated storm water drainage device.

[0109] Even in this case, the amount of rainwater flowing into the roof drain can be stabilized. Since the siphon effect can be effectively generated inside the The effect can be obtained.

[0110] (B) In the above embodiment, the rainwater drainage device 10 is arranged along the outer periphery of the bottom surface 11a of the base portion 11. In the above description, an example in which eight flow straightening fins 13 are provided radially has been given. However, the present invention does not apply to this. Not limited to this.

[0111] For example, as shown in FIG. 4(b), a rainwater drainage device with the number of flow straightening fins 13 reduced to four is used. It may be a position 210.

[0112] That is, the number of flow straightening fins is not particularly limited and may be any number. Further, the flow straightening fins are arranged along the radial direction of a circle having the drop opening 11b of the base portion 11 as the center. The present invention is not limited to a configuration in which the electrodes are arranged radially, but may be arranged obliquely with respect to the radial direction. It may be possible.

[0113] (C) In the above embodiment, an example in which a smooth plate-shaped member is used as the lid portion 12 has been described. However, the present invention is not limited to this.

[0114] For example, as shown in FIG. 5(a), a cover having a concave surface facing the drop hole 11b may be used. The storm water drainage device 310 may include a portion 312.

[0115] Alternatively, as shown in FIG. 5(b), the surface opposite to the surface facing the drop hole 11b may be concave. The storm water drainage device 410 may include a lid portion 412 formed in a tubular shape.

[0116] In addition, in the configurations of these rainwater drainage devices 310 and 410, the gap used in the above relational expression The size (height) h of G is the minimum gap between the surface facing the drop hole 11b and the bottom surface 11a. It is sufficient that the height is set to a value that satisfies the above requirement.

[0117] (D) In the above embodiment, an example in which the lid portion 12 made of a circular plate-shaped member is used has been described. However, the present invention is not limited to this.

[0118] For example, the shape of the lid is not limited to a circle, but may be other shapes such as an ellipse or a polygon. In addition, when the lid part has a shape other than a circle, the lid part is inscribed on the surface of the lid part facing the drop hole. It is sufficient that the diameter of the circle is b and that the above relational expression is satisfied.

[0119] However, the rainwater that flows into the outlet is not uniform around the entire circumference. As in the above embodiment, it is preferable to use a circular lid portion.

[0120] (E) In the above embodiment, the rainwater drainage device 10 is installed in the vicinity of the lower end of the roof R along a substantially horizontal direction. However, the present invention is not limited to this. It is not something that can be determined.

[0121] For example, the rainwater drainage device of the present invention may be installed on a rooftop or on the edge of a flat roof. [Industrial Applicability]

[0122] The rainwater drainage device of the present invention effectively generates a siphon phenomenon in a drainage pipe, In addition, it is possible to eliminate factors that hinder the occurrence of the siphon phenomenon and drain rainwater efficiently. This has the effect of making it possible to use a siphon in various drainage systems. It is widely applicable. [Explanation of symbols]

[0123] 10 Rainwater drainage system 11 Base 11a Bottom 11b Drop hole 11c Cylindrical part 12 Lid 13. Straightening fin 14 Drain pipe 20 Slab 21 Roof drain 22 Water collection pipe 23 Drain 30 Buildings 50 Stormwater drainage system 110 Rainwater drainage system 210 Rainwater drainage system 310 Rainwater drainage system 312 Lid 410 Rainwater drainage system 412 Lid a Inner diameter b Diameter h Gap size G Gap R Roof

Claims

1. A rainwater drainage device that collects rainwater and drains it from a drain pipe, A base portion having a bottom surface and a drop outlet connected to the drain pipe; A lid portion facing the drop opening and disposed at a predetermined gap from the bottom surface; Equipped with If the size of the gap is h and the inner diameter of the drop hole is a, the following relational expression (1) is satisfied: The size of the gap h is 20 mm or more and 40 mm or less, The diameter b of the lid portion is 190 mm or more and 300 mm or less. Rainwater drainage system. 0.22≦h / a≦0.37 (1)

2. A plurality of fins are disposed on the outer periphery of the bottom surface of the base portion and are disposed at equal angular intervals around the drop opening. The rainwater drainage system according to claim 1.

3. The lid portion is disposed along a radial direction of a virtual circle inscribed on the surface of the lid portion. The outer peripheral end of the fin protrudes from the outer edge of the lid. A rainwater drainage system according to claim 2.

4. The lid portion is a circular plate. A rainwater drainage device according to any one of claims 1 to 3.

5. A rainwater drainage device according to any one of claims 1 to 4, A water collection pipe connected to the rainwater drainage device; A drainage outlet connected to the water collection pipe; A storm water drainage system that includes:

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