JP2024033128A - Rainwater drainage system and roof structure - Google Patents

Abstract

[Problem] To provide a rainwater drainage system that can prevent problems caused by excessive opening of the ends of sprinkler pipes and problems caused by excessive blockage. [Solution] The rainwater drainage system includes a sprinkler pipe 40 connected to a downspout 17 via a first elbow 18, and at least one opening 42 is provided on the sprinkler pipe 40 facing downward. The downward end 44 of the sprinkler pipe 40 is open, and the area of the end 44 of the sprinkler pipe 40 is blocked by 40 to 80% of the cross-sectional area of the pipe flow path immediately before it. [Selected Figure] Figure 2

Description

The present disclosure relates to a rainwater drainage system and a roof structure including a sprinkler pipe connected from a downspout via an elbow.

Conventionally, as described in Patent Document 1, the lower end of a vertical gutter that extends downward from the upper floor roof of a building is placed above the downstairs roof, and the lower end of the vertical gutter diffuses rainwater to the lower floor roof. It is described that a drainage member is provided to drain the water. In the drainage member, a vertical trough connection part is provided at the top of one end of a horizontally long rectangular parallelepiped container, and a plurality of rectangular drainage holes are formed in the front part, the bottom part, or both.

Japanese Patent Application Publication No. 11-71871

A conceivable configuration is to connect a water sprinkler pipe extending laterally from the upper floor roof to a lower floor roof such as a lower house via an elbow to the lower end of a vertical gutter, and to form drainage holes at multiple positions in the longitudinal direction of the water sprinkler pipe. With this configuration, rainwater can be drained to the lower part of the downstairs roof through the plurality of drainage holes in the sprinkler pipe. Drained rainwater is collected in an eaves gutter attached near the eave end of the downstairs roof, and can be drained downward through a vertical gutter connected to the eave gutter. However, in this configuration, the terminal end of the water sprinkler pipe is largely opened, so much of the water sent to the water sprinkler pipe is discharged from the terminal end. In particular, when the inside of the pipe is not full of water, the water pressure within the pipe is not uniform, so if the flow rate of water is high, it is thought that the water will overcome the drain hole and proceed to the end and be discharged. This may cause an inconvenience in that rainwater flows from the eaves of the downstairs roof over the eaves gutter.

With the configuration described in Patent Document 1, there is a possibility that splashing out of rainwater can be suppressed to some extent. However, since the downstream end of the drainage member in the flow direction is blocked, there is a possibility that foreign matter flowing in from upstream will stay at this end.

It is also conceivable to connect the end of the sprinkler pipe below the ground to a drainage basin for removing foreign matter and discharging water to a sewer pipe. With this configuration, it is also possible to introduce water flowing out from a plurality of drainage holes of the water pipe into the drainage mass. However, with this configuration, when the terminal end of the sprinkler pipe is wide open, rainwater is drained from the terminal end of the sprinkler pipe at a high drainage rate, which may cause rainwater to leak from the drainage basin. Additionally, if the end of the water spray pipe is completely blocked, there is a possibility that foreign matter will remain at the end. In addition, in this case, if a vertical pipe is connected to the upstream side of the water pipe via an elbow to configure a high drainage system, the flow path pressure loss on the downstream side of the drainage will increase, and the drainage performance may decrease significantly. There is sex. With this, it is desirable to prevent the harmful effects caused by excessive opening of the terminal end of the water pipe and the harmful effects caused by excessive blockage.

Therefore, an object of the present disclosure is to provide a rainwater drainage system and a roof structure that can prevent the harmful effects caused by excessively opening the ends of water pipes and the harmful effects caused by excessively blocking them.

A rainwater drainage system according to the present disclosure is a rainwater drainage system including a watering pipe connected from a downpipe via a first elbow, and the watering pipe has at least one opening facing downward. , a rainwater drainage system in which the lower end of the sprinkler pipe is open, and the area of the end of the sprinkler pipe is blocked by 40 to 80% of the cross-sectional area of the immediately preceding pipe flow path.

A roof structure according to the present disclosure is a roof structure comprising a rainwater drainage system according to the present disclosure, and a shed or eaves from which water is drained by the sprinkler pipes below the water pipes, the shed or eaves comprising: It includes a folded roof with a corrugated cross-section, and the at least one opening hole is a plurality of opening holes provided at a pitch of 200 mm to 500 mm, and the pitch of the plurality of valleys of the folded roof is This is a roof structure in which the integral multiple and the pitch of the plurality of opening holes match.

According to the rainwater drainage system and roof structure according to one aspect of the present disclosure, it is possible to prevent harmful effects caused by excessively opening the terminal ends of water pipes and harmful effects caused by excessive blockage.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows a part of building in which the rainwater drainage system of embodiment was installed. FIG. 2 is an enlarged perspective view of section A in FIG. 1. FIG. FIG. 3 is a schematic view of the water sprinkler pipe of FIG. 2 viewed from above. 4 is a sectional view taken along line BB in FIG. 3. FIG. FIG. 4 is a view taken along arrow C in FIG. 3; FIG. 4 is a view taken along arrow D in FIG. 3 showing the end of the elbow in the embodiment. FIG. 4 is a diagram corresponding to FIG. 3 showing a water sprinkler pipe of a comparative example. FIG. 7 is a diagram corresponding to FIG. 6 illustrating the elbow end of a first example of another example of the embodiment. FIG. 7 is a diagram corresponding to FIG. 6 showing the end of an elbow in a second example of another example of the embodiment. It is a schematic diagram showing a rainwater drainage system of another example of an embodiment. They are a diagram (a) corresponding to FIG. 3 in a rainwater drainage system according to another example of the embodiment, and a diagram (b) in which the E section in (a) is viewed in the longitudinal direction of the sprinkler pipe in (a).

Hereinafter, embodiments of a rainwater drainage system according to the present disclosure will be described with reference to the drawings. Note that when a plurality of embodiments, modifications, etc. are included below, it is assumed from the beginning that a new embodiment will be constructed by appropriately combining their characteristic parts. The shape, arrangement, number, material, etc. described below are examples for explanation, and can be changed as appropriate depending on the specifications of the rainwater drainage system. In the following description, the same elements are given the same reference numerals in all the drawings.

An embodiment will be described using FIGS. 1 to 6. FIG. 1 is a schematic perspective view showing a part of a building 100 in which a rainwater drainage system 1 according to an embodiment is installed. The building 100 in which the rainwater drainage system 1 is installed includes an entrance door (not shown), an eaves 103 protruding from the vicinity of the wall 101 above the windows on the first floor, and a roof above the eaves 103. It includes a lower house 104 and a large roof 105 which is a roof above the lower house 104. Each of the large roof 105, the lower roof 104, and the eaves 103 is formed by a folded roof with a corrugated cross section. The upper surfaces of the large roof 105 and the lower roof 104 are inclined downward toward the front end of the eaves. On the other hand, the upper surface of the eaves 103 is inclined upward toward the eaves. For example, the eaves 103 is suspended and supported by support members 102 fixed near the corners of the wall surface 101 of the building so as to maintain its inclination. An eaves gutter 14, which will be described later, is attached to the wall surface 101, and the lower end of the eaves 103 is close to the upper opening periphery of the eaves gutter 14.

The rainwater drainage system 1 includes an upper eave gutter 10 provided at the eaves of the large roof 105, a lower eave gutter 12 provided at the eaves of the lower eave 104, and a lower eave gutter 12 located near the wall surface 101 below the lower eave gutter 12. The eave gutter 14 is provided laterally along the wall surface 101.

The rainwater drainage system 1 further includes an upper water pipe 20 provided between the upper eave gutter 10 and the lower eave 104, and a lower water pipe 40 provided between the lower eave gutter 12 and the eaves 103. include. The upper water sprinkling pipe 20 is connected to the lower side of the first downpipe 15 via the first elbow 16 from the first downpipe 15 . The upper end of the first downpipe 15 is connected to the upper eave gutter 10 via a first drainage drain (not shown). Specifically, an opening (not shown) is formed in the bottom plate of the upper eave gutter 10, and a first water drain is attached to the opening. The upper end of the first downpipe 15 is attached to the lower part of the first water drain.

The lower water pipe 40 is connected from the second downpipe 17 to the lower side of the second downpipe 17 via the first elbow 18 . The upper end of the second downpipe 17 is connected to the lower eaves gutter 12 via a second drainage drain (not shown). Specifically, an opening (not shown) is formed in the bottom plate of the lower eaves gutter 12, and the second drainage drain is attached to the opening. The upper end of the second downpipe 17 is attached to the lower part of the second water drain. The upper end of a third vertical gutter 19 is connected to the eaves gutter 14 via a third drainage drain (not shown). Specifically, an opening (not shown) is formed in the bottom plate portion of the eaves gutter 14, and a third water drain is attached to the opening. The upper end portion of the third vertical trough 19 is attached to the lower portion of the third water drain. Each downpipe 15, 17, 19 is arranged along the up-down direction. The first drainage drain, the second drainage drain, and the third drainage drain are configured to have a function of inducing a siphon phenomenon, like the drainage drain 61 used in another example of the configuration described later with reference to FIG. 10. Alternatively, it may be configured without the function of inducing the siphon phenomenon. Each first elbow 16, 18 is bent approximately 90 degrees. Thereby, each of the water sprinkler pipes 20 and 40 extends in the lateral direction along the wall surfaces 106 and 101 adjacent to each other. The upper water pipe 20 drains water to the upper surface of the lower house 104. The lower water pipe 40 discharges water to the upper surface of the eaves 103. The structure of each sprinkler pipe 20, 40 will be explained in detail later.

Rainwater that has fallen on the large roof 105 is introduced from the upper eave gutter 10 to the first vertical gutter 15, flows down the first vertical gutter 15, and then is sent to the upper water pipe 20 via the first elbow 16. Note that the roof above the lower roof 104 is not limited to the large roof 105 including a folded roof, and may be a roof other than the large roof, such as an upper-floor lower roof or a roof with a balcony function.

In the upper sprinkler pipe 20, rainwater is drained to the upper surface of the lower house 104 through the plurality of openings 22 and the opening 25 at the terminal end 24. The rainwater flows over the lower house 104 towards the eaves and is sent to the lower house eaves gutter 12. Rainwater sent to the lower eaves gutter 12 is sent from the second downpipe 17 to the lower water pipe 40 via the first elbow 18. In the lower sprinkler pipe 40, rainwater is drained onto the upper surface of the eaves 103 through the plurality of openings 42 and the opening 45 at the terminal end 44. While flowing on the eaves 103, the rainwater flows toward the eaves gutter 14 and is sent to the eaves gutter 14. The rainwater sent to the eaves gutter 14 flows down the third vertical gutter 19 and is drained downward.

The lower sprinkler pipe 40 will be explained in detail using FIGS. 2 to 6. FIG. 2 is an enlarged perspective view of section A in FIG. FIG. 3 is a schematic diagram of the lower sprinkler pipe 40 of FIG. 2 viewed from above. 4 is a sectional view taken along line BB in FIG. 3, and FIG. 5 is a view taken along arrow C in FIG.

The upper water sprinkling pipe 20 is the same as the lower water sprinkling pipe 40 except that the number of opening holes 42 and the number of opening holes 22 are different. For this reason, the configuration of each of the water sprinkler pipes 20 and 40 will be explained below, mainly using the lower water spray pipe 40 as a representative. The lower water spray pipe 40 includes a water spray pipe main body 41 that extends linearly, and a second elbow 43 that is connected to the terminal end of the water spray pipe main body 41 and bent approximately 90 degrees. The lower water pipe 40 extends laterally along the wall surface 101 and is attached to the wall surface 101 by a mounting bracket (not shown).

A plurality of substantially circular openings 42 are provided at a plurality of positions in the longitudinal direction of the water sprinkler main body 41 so as to face downward. The terminal end 44 of the second elbow 43, which is the downstream end and the terminal end of the lower water pipe 40, is open at the bottom and has an opening 45, and the area of the terminal end 44 of the second elbow 43 is the same as that of the tube immediately before the terminal end 44. The section 46 is blocked by 40 to 80% of its cross-sectional area.

Furthermore, the plurality of opening holes 42 are provided at a pitch P1 of 200 mm to 500 mm. Further, the opening inner diameter (diameter) of each opening hole portion 42 is 75 mm to 100 mm. Furthermore, the pitch P1 of the plurality of opening holes 42 and the pitch P2 of the plurality of valleys of the folded roof that the lower water pipe 40 faces, or an integral multiple of the pitch P2 of the valleys, substantially match. FIG. 2 shows a case where the lower water pipe 40 is provided with four opening holes 42, and the pitch P1 of the opening holes 42 and the pitch P2 of the troughs of the folded roof forming the eaves 103 approximately match. It shows. For example, the pitch P2 of the valleys of the folded roof can be 250 mm, 333 mm, or 500 mm. On the other hand, the pitch P1 of the plurality of opening holes 42 may be made to match the length of an integral multiple, such as twice or three times the pitch of the troughs.

The water sprinkler main body 41 may be a hard polyvinyl chloride pipe such as VP or VU according to the JIS standard, and may have a nominal diameter of 75 mm, 100 mm, 125 mm, 150 mm, or the like. Moreover, each water sprinkler pipe 20, 40 may be provided with only one opening hole.

On the other hand, in the case of the upper sprinkler pipe 20 (FIG. 1), three openings 22 are provided, and the pitch of the openings 22 is determined by the folded roof forming the lower roof 104 facing the upper sprinkler pipe 20. The pitch of the troughs or the length of an integral multiple of the pitch of the troughs substantially match.

As shown in FIGS. 3 and 4, the exit angle θ1 of each opening hole 42 of the lower water pipe 40 is 0 degrees or more toward the front side, that is, toward the eaves away from the wall surface 101, with θ1 = 0 degrees vertically downward. It is open within a range of 60 degrees or less. In FIG. 4, θ1m indicates 60 degrees, which is the maximum angle of the exit angle θ1.

As shown in FIGS. 3 and 5, the end of the second elbow 43 of the lower sprinkler pipe 40 has an outlet angle θ2 toward the front within a range of 0 degrees or more and 60 degrees or less, with the vertically downward direction being θ2=0 degrees. The central axis O1 is facing. In FIG. 5, θ2m indicates 60 degrees, which is the maximum angle of the exit angle θ2.

FIG. 6 is a view taken along arrow D in FIG. 3 showing the end of the second elbow 43 in the embodiment. In FIG. 6, the hatched portion indicates the portion of the end 44 of the second elbow 43 that is closed by the closing portion 44a. In this example, the terminal end 44 is covered with a closing portion 44a downward from the upper end 44b so as to block 40 to 80% of the immediately previous pipe channel cross-sectional area. For example, the closing part 44a includes an upper semicircular part with a radius of Rmm, which is 1/2 of the inner diameter of the immediately preceding pipe flow path, and a distance of dmm downward along the terminal end surface from the center that overlaps with the central axis O1 of the terminal end 44. It is formed of a substantially rectangular portion whose height extends to the lowered position, and a portion of the terminal end 44 is closed by the closing portion 44a. In this case, the opening 45 of the terminal end 44 that is not blocked by the closing part 44a is formed in a shape surrounded by a circular arc that is the lower end of the circular outer shape of the terminal end and a horizontal chord at the upper end of the circular arc. be done. At this time, the area of the opening 45 is determined from the radius Rmm and the height dmm from the center to the upper end of the opening 45. Therefore, since the height dmm when the area of the opening 45 becomes equal to 0.2×πR ² (mm ² ) can be calculated, the position and shape of the closing portion 44a can be determined.

In addition, in this example, the rainwater drainage system 1 of this example, the lower house 104 where water is drained by the upper water pipe 20 below the water pipe 20, and the lower water water pipe 40 is drained from the lower water pipe 40 below the water pipe 40. A roof structure is formed from the eaves 103. The pitch P1 of the plurality of openings 22, 42 of each water sprinkler pipe 20, 40 is set at an interval of 200 mm to 500 mm. The pitch of the plurality of valleys of the folded roof forming the lower roof 104 and the eaves 103, or an integral multiple of the pitch, matches the pitch of the plurality of openings 22, 42 of the corresponding sprinkler pipes 20, 40. A folded roof having troughs with different pitches in the lower roof 104 and the eaves 103 may be used.

According to the above rainwater drainage system 1 and roof structure, the terminal ends 24, 44 of each water pipe 20, 40 are opened within an appropriate range, so that the terminal ends 24, 44 of each water pipe 20, 40 are not excessively opened. It is possible to prevent the harmful effects caused by excessive blockage. For example, the area of the terminal ends 24, 44 of the sprinkler pipes 20, 40 is less than 80% of the previous pipe flow path cross-sectional area, and they are blocked except for the lower end, so when water is drained at a normal flow rate, there is almost no pressure loss. Water can be drained, and when a large amount of water is being drained, the water force can be suppressed by an appropriate pressure drop.

For example, the opening areas of the terminal ends 24, 44 of the sprinkler pipes 20, 40 basically depend on the flow rate, and in the water sprinkler pipes 20, 40 extending in the lateral direction, the water level approaches the full state from the bottom. As a result, water can be drained with almost no pressure loss in each of the sprinkler pipes 20 and 40 at a normal flow rate, which is said to be approximately 60% full of water in the upstream downspout. In addition, when each water pipe 20, 40 drains water in excess of the normal flow rate, for example, in the case of high drainage due to the siphon action of the upstream downpipe, a moderate pressure drop is caused by moderate blockage of the terminal ends 24, 44. The water force is suppressed.

In addition, since the area of the terminal ends 24, 44 of the water sprinkler pipes 20, 40 is opened by more than 20% at the lower end with respect to the cross-sectional area of the pipe flow path immediately before, sludge, fallen leaves, etc. Foreign matter can flow out, and foreign matter can be prevented from staying at the terminal ends 24, 44. Further, since the area of the terminal ends 24, 44 of the water sprinkler pipes 20, 40 is 40% or more of the cross-sectional area of the immediately preceding pipe flow path, the water force is suppressed with a more moderate pressure drop. Thereby, the amount of water discharged from the terminal ends 24, 44 can be prevented from becoming excessively large compared to the amount of water discharged from the respective openings 22, 42 of the water sprinkler pipes 20, 40. For this reason, as shown by the arrow marked with an X in FIG. can. Note that the eaves 103 is not limited to a configuration in which it becomes higher toward the eaves as in the illustrated example, but may extend almost horizontally or be inclined to become lower toward the eaves, and an eave gutter is provided at the eaves. You can also use it as

Further, the area of the terminal ends 24, 44 of the water sprinkler pipes 20, 40 is preferably 45 to 55%, and even more preferably approximately 50%, of the immediately previous cross-sectional area of the pipe flow path.

In FIG. 3, the flow rate is schematically shown by the thickness of the arrow in the lower water pipe 40. In this embodiment, water can be drained from the terminal ends 24, 44 of the sprinkler pipes 20, 40 with a moderate pressure drop, especially when draining water at high drainage.

FIG. 7 is a diagram corresponding to FIG. 3 showing a lower sprinkler pipe 40a of a comparative example. Similarly to FIG. 3, in FIG. 7, the flow rate is schematically shown by the thickness of the arrow in the lower sprinkler pipe 40a. In the comparative example shown in FIG. 7, the terminal end 47 of the lower water pipe 40a is not closed. In the comparative example, the other configurations are similar to the configurations of the embodiments shown in FIGS. 1 to 6. In this comparative example, as shown in FIG. 7, when draining water at a particularly high rate at the terminal end 47 of the lower water pipe 40a, the water force from the terminal end 47 is not suppressed, so rainwater tends to flow out from the eaves of the shed and eaves. Become.

In the embodiments shown in FIGS. 1 to 6, the outlet angle θ1 of each opening hole 22, 42 of each water pipe 20, 40 is 0 degrees or more and 60 degrees toward the front, with θ1=0 degrees vertically downward. It is open in the following range. In addition, at the end of the second elbow 43 of each water pipe 20, 40, the central axis О1 is oriented toward the front at an exit angle θ2 within a range of 0 degrees or more and 60 degrees or less, with the vertically downward direction being θ2=0 degrees. There is. On the other hand, if the outlet angles θ1 and θ2 exceed 60 degrees, water tends to be discharged to a position far away from each water spray pipe 20, 40, which is inappropriate.

Furthermore, if the exit angles θ1 and θ2 are vertically downward, where the angles θ1 and θ2 are 0 degrees, there is a risk of water splashing from the shed or eaves. Although this may depend on the water force, it is more preferable that the exit angles θ1 and θ2 are each 30 to 45 degrees.

FIG. 8 is a diagram corresponding to FIG. 6 showing the terminal end 48 of the second elbow 43a in a first example of another example of the embodiment. The meaning of the shaded portion in FIG. 8 is the same as that in FIG. 6. In this example, a circular opening 49 is formed at the lower end of the terminal end 48, and the remaining portion is covered with a closing portion 48a. As a result, the terminal end 48 is blocked by 40 to 80% of the immediately previous cross-sectional area of the pipe flow path.

FIG. 9 is a diagram corresponding to FIG. 6 showing a terminal end 50 of the second elbow 43b in a second example of another example of the embodiment. The meaning of the shaded portion in FIG. 9 is also the same as that in FIG. In this example, the lower end edge 50b of the closing portion 50a of the terminal end 50 is a circular arc with a convex upper side, and an opening 51 is formed on the lower side thereof. As a result, the terminal end 50 is blocked by 40 to 80% of the immediately previous cross-sectional area of the pipe flow path.

FIG. 10 is a schematic diagram showing another example of the rainwater drainage system 1a of the embodiment. In the rainwater drainage system 1a of this example, a vertically long vertical gutter 70 is connected via a drainage drain 61 to the lower side of an eaves gutter 60 provided at the eaves of a roof such as a large roof. A water sprinkler pipe 72 with a first elbow 71 connected to the upstream side is arranged below the ground 107. The lower end of the downpipe 70 and the upper end of the first elbow 71 are not closely connected. Then, the terminal end of the water sprinkler pipe 72 is inserted into the drainage mass 80. Thereby, the water sprinkler pipe 72 drains water into the drainage mass 80. The basic configuration of the sprinkler pipe 72 itself is similar to the configuration of each of the sprinkler pipes 20 and 40 in the embodiment shown in FIGS. 1 to 6, 7, or 8. A plurality of opening holes 73 are formed at a plurality of positions in the longitudinal direction of the water sprinkler pipe 72 . A pipe (not shown) connected to a sewer pipe is connected to the drainage mass 80.

The drainage drain 61 connected between the eave gutter 60 and the vertical gutter 70 has a high drainage function. For example, the drain 61 is composed of an upper drain member 62 and a lower drain member 65, and an opening (not shown) is formed in the bottom plate of the eaves gutter 60, and the drain 61 is attached to the opening. It will be done. The upper drain member 62 and the lower drain member 65 are screwed together with the bottom plate portion of the eave gutter 60 sandwiched therebetween. The drainage drain 61 induces a siphon phenomenon when a large amount of rainwater flows into the eaves gutter 60 during heavy rain or the like. For this purpose, the upper drain member 62 is connected to a plurality of blade portions 63 erected at approximately equal intervals in the circumferential direction on the upper surface of the flange, for example five positions, and to the radially inner ends of the plurality of blade portions 63. This includes an upper cylindrical part supported coaxially with the lower cylindrical part of the drainage drain, and an enlarged diameter part connected to the upper end of the upper cylindrical part and increasing in diameter upward. The plurality of blade parts 63 have a function of rectifying rainwater flowing in from the inlet of the upper drain member 62. Therefore, the rainwater is rectified by the plurality of blades 63 and flows, thereby inducing a siphon phenomenon.

When the rainwater flowing through the downpipe 70 reaches a predetermined flow rate or more, the rainwater flowing down the downpipe 70 is vigorously drained downward from the downpipe 70 due to the siphon phenomenon. Specifically, when the rainwater flowing through the downpipe 70 exceeds a predetermined flow rate, a plug filled with rainwater is easily formed in a part of the downpipe 70. Negative pressure is generated at the stopper due to the difference in height, increasing the force that pulls rainwater downward, creating a siphon effect that forces rainwater to flow down. Further, in the above-mentioned drainage drain 61, since the effect of rectifying rainwater can be enhanced by the plurality of blades 63, generation of vortices can be suppressed when rainwater flows into the inlet. As a result, it is possible to suppress air from being sucked into the downpipe 70 by the vortex, so that better siphon performance can be exhibited and drainage performance can be improved.

In this way, in the high drainage system 108 including the downpipe 70, the drainage drain 61, and the water sprinkler pipe 72, if the end of the system 108 is excessively blocked, the loss indicated by the broken line in FIG. 10 increases. This causes the flow path pressure drop to increase, resulting in a decrease in drainage performance. Further, if the terminal end of the water sprinkling pipe 72 is excessively blocked, the terminal end may be clogged with foreign matter such as dirt. Further, if the end of the water sprinkler pipe 72 is opened excessively, rainwater may leak from the upper side of the drainage basin 80.

In the configuration of this example, since the terminal end 74 of the water sprinkler pipe 72 is appropriately opened, it is possible to prevent the harmful effects caused by excessive opening of the terminal end 74 and the harmful effects caused by excessive blockage. For example, since the terminal end 74 is not excessively blocked, channel pressure loss in the high drainage system 108 can be reduced, and deterioration in drainage performance can be suppressed. Furthermore, clogging of foreign matter at the terminal end 74 can be suppressed. Furthermore, since the terminal end 74 is not opened excessively, leakage of rainwater from the drainage basin 80 can be prevented. Moreover, water can be drained underground from the plurality of openings 73 of the water sprinkler pipe 72 or to another drainage part connected to a sewer pipe.

FIG. 11(a) is a diagram corresponding to FIG. 3 in another example of the rainwater drainage system of the embodiment, and FIG. 11(b) shows the E section in (a) in the longitudinal direction of the sprinkler pipe 82 in (a). This is the diagram as seen in the figure. In this example, no drain is provided at the end of the water sprinkler pipe 82. A terminal end 84 of the water sprinkling pipe 82 is provided at one end in the longitudinal direction of the water sprinkling pipe 82, the upper side is closed with a closing part 85, and the lower end is open by providing an opening 86 below.

Further, the area of the terminal end 84 of the water sprinkler pipe 82 is blocked by 40 to 80% of the cross-sectional area of the immediately preceding pipe flow path. The water sprinkling pipe 82 is used as an upper water sprinkling pipe and a lower water sprinkling pipe, respectively, in FIG. 1, for example.

In the configuration of this example, since a drain is not provided at the terminal end of the water sprinkling pipe 82, the water from the terminal end 84 of the water sprinkling pipe 82 is drained diagonally downward as shown by the arrow α in FIG. Even in this case, by appropriately closing the terminal end 84 of the sprinkler pipe 82, the water force of the drainage can be suppressed, so that rainwater can be suppressed from flowing out from the eaves of the shed or eaves. Furthermore, accumulation of foreign matter at the end of the water sprinkler pipe 82 can also be suppressed. In this example, other configurations and operations are similar to those in FIGS. 1 to 6.

The configuration of the present disclosure described above is as follows.
(Configuration 1)
A rainwater drainage system comprising a sprinkler pipe connected from a downpipe via a first elbow,
The water sprinkler pipe is provided with at least one opening hole facing downward,
The lower end of the water sprinkling pipe is open, and the area of the water pipe ending is blocked by 40 to 80% of the previous cross-sectional area of the pipe flow path.
Rainwater drainage system.
(Configuration 2)
In the rainwater drainage system described in Configuration 1,
The water sprinkling pipe includes a water sprinkling pipe main body extending linearly, and a second elbow connected to the terminal end of the water sprinkling pipe main body and bent at approximately 90 degrees,
The lower end of the second elbow is open, and the area of the end of the second elbow is closed by 40 to 80% of the immediately previous cross-sectional area of the pipe flow path.
Rainwater drainage system.
(Configuration 3)
In the rainwater drainage system according to configuration 1 or configuration 2,
The outlet angle θ1 of the opening hole portion of the water sprinkler pipe opens toward the front in a range of 0 degrees or more and 60 degrees or less, with θ1 = 0 degrees vertically downward.
Rainwater drainage system.
(Configuration 4)
In the rainwater drainage system described in configuration 2,
The terminal end of the second elbow has a central axis facing forward at an exit angle θ2 within a range of 0 degrees or more and 60 degrees or less, with θ2 = 0 degrees vertically downward.
Rainwater drainage system.
(Configuration 5)
In the rainwater drainage system according to configuration 1 or configuration 2,
The at least one opening hole is a plurality of opening holes provided at a pitch of 200 mm to 500 mm,
Each of the plurality of openings has an inner diameter of 75 mm to 100 mm,
Rainwater drainage system.
(Configuration 6)
In the rainwater drainage system according to any one of configurations 1 to 5,
The sprinkler pipe drains water to the upper surface of the shed or eaves;
Rainwater drainage system.
(Configuration 7)
In the rainwater drainage system according to any one of configurations 1 to 5,
the sprinkler pipe drains water into a drainage basin;
Rainwater drainage system.
(Configuration 8)
The rainwater drainage system described in Configuration 1,
A roof-top structure comprising a shed or an eaves from which water is drained by the water pipe below the water pipe,
The shed or eave includes a folded roof with a corrugated cross section,
The at least one opening hole is a plurality of opening holes provided at a pitch of 200 mm to 500 mm,
The pitch of the plurality of valleys of the folded roof or an integral multiple of the pitch of the plurality of valleys matches the pitch of the plurality of opening holes,
roof structure.

1, 1a Rainwater drainage system, 10 upper eave gutter, 12 lower eave gutter, 14 eave gutter, 15 1st gutter, 16 1st elbow, 17 2nd gutter, 18 1st elbow, 19 3rd gutter, 20 Upper sprinkler pipe, 22 Opening hole, 24 Termination, 25 Opening, 21 Large diameter cylinder portion, 40, 40a Lower sprinkler pipe, 41 Water sprinkler pipe main body, 42 Opening hole, 43, 43a, 43b Second elbow, 44 Termination , 44a closing part, 44b upper end, 45 opening, 46 cylinder part, 47, 48 terminal end, 48a closing part, 49 opening, 50 terminal end, 50a closing part, 50b lower edge, 51 opening, 60 eave gutter, 61 drainage drain, 70 Vertical gutter, 71 First elbow, 72 Water pipe, 73 Opening hole, 74 End, 80 Drainage mass, 82 Water pipe, 84 End, 85 Blocking part, 86 Opening, 100 Building, 101 Wall, 102 Support member, 103 Eave , 104 Lower house, 105 Large roof, 106 Wall, 107 Ground, 108 High drainage system.

Claims (8)

A rainwater drainage system comprising a sprinkler pipe connected from a downpipe via a first elbow,
The water sprinkler pipe is provided with at least one opening hole facing downward,
The lower end of the water sprinkling pipe is open, and the area of the water pipe ending is blocked by 40 to 80% of the previous cross-sectional area of the pipe flow path.
Rainwater drainage system. The rainwater drainage system according to claim 1,
The water sprinkling pipe includes a water sprinkling pipe main body extending linearly, and a second elbow connected to the terminal end of the water sprinkling pipe main body and bent at approximately 90 degrees,
The lower end of the second elbow is open, and the area of the end of the second elbow is closed by 40 to 80% of the immediately previous cross-sectional area of the pipe flow path.
Rainwater drainage system. The rainwater drainage system according to claim 1,
The outlet angle θ1 of the opening hole portion of the water sprinkler pipe opens toward the front in a range of 0 degrees or more and 60 degrees or less, with θ1 = 0 degrees vertically downward.
Rainwater drainage system. The rainwater drainage system according to claim 2,
The terminal end of the second elbow has a central axis facing forward at an exit angle θ2 within a range of 0 degrees or more and 60 degrees or less, with θ2 = 0 degrees vertically downward.
Rainwater drainage system. The rainwater drainage system according to claim 1,
The at least one opening hole is a plurality of opening holes provided at a pitch of 200 mm to 500 mm,
Each of the plurality of openings has an inner diameter of 75 mm to 100 mm,
Rainwater drainage system. The rainwater drainage system according to any one of claims 1 to 5,
The sprinkler pipe drains water to the upper surface of the shed or eaves;
Rainwater drainage system. The rainwater drainage system according to any one of claims 1 to 5,
the sprinkler pipe drains water into a drainage basin;
Rainwater drainage system. A rainwater drainage system according to claim 1;
A roof-top structure comprising a shed or eaves under the sprinkler pipe from which water is drained by the sprinkler pipe,
The shed or eave includes a folded roof with a corrugated cross section,
The at least one opening hole is a plurality of opening holes provided at a pitch of 200 mm to 500 mm,
The pitch of the plurality of valleys of the folded roof, or an integral multiple of the pitch of the plurality of valleys, matches the pitch of the plurality of opening holes,
roof structure.

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