JP3341012B2 - Downstream pipe for rainwater flowing down - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversion pipe for diverting rainwater dropped on a roof or a roof of a house into rainwater flowing down a sewer pipe and rainwater stored in a storage infiltration basin or a storage tank.

[0002]

2. Description of the Related Art As such a diverting pipe for rainwater, the present inventor has proposed a water collecting basin in which a vertical portion is formed and an upper end is connected to a hanging part of a rain gutter and a lower end of the outer pipe communicates with a sewer sewer. A patent application was filed for a drainage pipe for running rainwater, which is connected and the lower end of an inner pipe whose outer peripheral edge at the upper end is arranged at a predetermined distance from the inner peripheral surface of the vertical portion is connected to a rainwater storage and infiltration basin (Japanese Kaisho 64-
83738). The inner diameter of a part of the vertical portion of the outer tube is formed by continuously changing, and the upper space of the inner tube is moved up and down to adjust the above-mentioned predetermined interval. An opening is provided in the outer tube near the upper end of the inner tube, and a lid that can be opened and closed is provided in this opening.

In this diversion pipe, the rainwater flowing down from the rain gutter flows down in a layered manner while adhering to the inner peripheral surface of the vertical portion of the outer pipe.
When the rainfall intensity (mm / h) does not exceed the drainage capacity of sewer pipes and rivers, the thickness of the layer of rainwater flowing down on the inner peripheral surface of the vertical part is the outer peripheral edge of the upper end of the inner cylinder and the vertical part Because it is smaller than the distance from the inner peripheral surface, it flows down only to the outer pipe, flows to the sewer pipe through the catchment basin, and does not flow to the inner pipe. During a large-scale rainfall in which the rainfall intensity exceeds the flowability of a sewer pipe or the like, the thickness of the layer of rainwater flowing down on the inner peripheral surface of the vertical portion becomes larger than the above interval, so that the rainwater also flows down to the inner pipe.
Rainwater that flows into the storage infiltration basin is once stored in this basin and then permeates and diffuses into the ground. As a result, rainwater from the rain gutter can be diverted to the storage infiltration basin only when the rainfall intensity exceeds the drainage capacity of sewer pipes and rivers, and it can be installed in a small space of the existing rain gutter with a simple structure, and It removes sand and coarse dust that enter from the reservoir to prevent clogging of the storage infiltration basin.

[0004]

However, for example, a hanging part of a rain gutter of a roof having an area of 50 m ² is actually connected to the outer pipe of the drainage pipe of the falling rain water, and a normal 10 mm / hour of about 10 mm / hour is connected to this roof. When the flow velocity at the lower end of the outer pipe and the thickness of the rainwater flow when the rain falls at the rainfall intensity are measured, the flow velocity is about 2 to 3 m / sec, and the rainwater layer flowing down while adhering to the inner peripheral surface of the outer pipe. Had a thickness of about 0.5 mm. Therefore, by moving the upper part of the inner pipe up and down to adjust the distance from the vertical inner diameter of the outer pipe to separate the rainwater flow attached to the inner peripheral surface of the outer pipe, There was a problem that it was difficult to divide the flow into desired flow rates because of the small thickness.

[0005] An object of the present invention is to prevent clogging of a storage infiltration basin by flowing all rainwater containing a lot of sand and dust accumulated on a roof or a roof into a sewer sewer at the time of light rain in the early stage of rainfall, and to prevent clogging of a storage infiltration basin. It is an object of the present invention to provide a downflow pipe for rainwater that can be diverted into a sewer sewer and a storage infiltration basin, and that can prevent rainwater from flowing into the sewer sewer or river beyond its ability to flow. Another object of the present invention is to provide a downflow pipe for rainwater that can be installed in a small space with a simple structure and that can be easily constructed and handled.

[0006]

The structure of the present invention for achieving the above object is shown in FIGS. 1, 3 and 5 corresponding to the embodiment.
This will be described with reference to FIG. In the present invention, as shown in FIGS. 1 and 3, a vertical portion 27 is formed, an upper end is connected to a hanging portion 13 of a rainwater flow path 11 for receiving rainwater 12 dropped on a roof or a roof of a house, and a lower end is a sewer pipe. An outer pipe 16 connected to a catchment basin 24 communicating with the culvert;
7 is disposed at a predetermined interval from the inner peripheral surface of the drainage pipe 7 and has an inner pipe 17 whose lower end is connected to one or both of the storage infiltration tank 26 and the storage tank for the rainwater 12.
4, a ring-shaped projection 19a on the inner peripheral surface of the vertical portion 27 of the outer tube 16 which is above the upper end of the inner tube 17 by a predetermined distance.
Is provided.

Further, as shown in FIG. 6, a flow dividing pipe 74 may be detachably provided between a hanging part of a rainwater flow path, a water collecting basin, and a storage infiltration basin or a storage tank. Further, as shown in FIG. 3 or 5, it is desirable that the tip of the projection 19a or 59a is formed in a convex curved surface.

[0008]

In the diversion pipe 14 shown in FIG. 1 and FIG. 3, in the case of light rain in the early stage of rainfall, the rainwater 12 flows together with the sand and dust accumulated on the roof from the rainwater flow path 11 via the hanging part 13 to the diversion pipe 1.
Flow into 4. At this time, the rainwater 12 flows into the vertical portion 27 of the branch pipe 14 while adhering to the inner peripheral surface of the hanging portion 13, and flows down in a layered manner while adhering to the inner peripheral surface of the vertical portion 27 even after climbing over the projection 19a. Flows into the sewer pipe via the water collecting basin 24. When the rainfall intensity is increased and the rainfall is increased, the rainwater 12 that has flowed into the branch pipe 14 jumps over the projection 19a and a certain amount of the attached flow that flows down while being attached to the inner peripheral surface of the vertical portion 27 even if it climbs over the projection 19a. Thus, the air is separated from the inner peripheral surface of the vertical portion 27 and the separated flow flowing into the inner pipe 17. The rainwater 12 that has become the attached flow flows into the sewer pipe through the water collecting basin 24, and the rainwater 12 that has become the outflow has been once stored in the storage infiltration basin 26 through the inner pipe 17 and then penetrated into the soil 29. And it becomes groundwater. When the rainfall intensity further increases and heavy rainfall occurs, all of the rainwater 12 that has flowed into the branch pipe 14 jumps at the projection 19a and separates from the inner peripheral surface of the vertical portion 27, and the inner pipe 17
After passing through the reservoir and being temporarily stored in the storage infiltration basin 26, it penetrates into the soil 29 and becomes groundwater.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the rain gutter 11 is provided along the periphery of the roof of the house, and the rain water 12
Receive. On the lower surface of the rain gutter 11, there is provided a short pipe 13, which is a vertically downward hanging part integrally with the rain gutter 11, to which the upper end of a branch pipe 14 is connected via a first pipe 21. Is done. The branch pipe 14 has an upper end connected to a lower end of the first pipe 21 and a lower end side connected to a catchment basin 24 via a second pipe 22. 16 and the lower end is the third pipe 2
3 and an inner pipe 17 connected to the storage and infiltration basin 26 via the inner pipe 3 (FIGS. 1 and 2). The flow dividing pipe 14 is formed of a vinyl chloride resin in this example.

The outer tube 16 has an upper case 18 having an upper end fitted to the lower end of the first pipe 21 and an upper case 1 having an upper end.
8 has a connection case 19 fitted to the lower end thereof, and a lower case 20 fitted to the lower end of the connection case 19 at the upper end. A horizontal pipe 20a protrudes from a lower end portion of the lower case 20, and an upper end of the second pipe 22 is fitted to the horizontal pipe 20a. A vertical portion 27 of the outer tube 16 is formed by the upper case 18, the connecting case 19, and the lower case 20 excluding the horizontal tube 20a. The inner tube 17 is formed integrally with the lower case 20, and the outer peripheral surface of the upper portion of the inner tube 17 inserted into the lower case 20 is arranged at a predetermined interval from the inner peripheral surface of the vertical portion 27 of the outer tube 16. . That is, the center line of the inner pipe 17 is
7 and the outer diameter of the upper part of the inner pipe 17 is
7 is formed smaller than the inner diameter. A funnel 28 that is formed to expand toward the upper end is inserted into the upper end of the inner pipe 17 (FIGS. 1 and 2).

A ring-shaped projection 19a is provided on the inner peripheral surface of the outer tube 16 above the upper end of the inner tube 17 by a predetermined distance. The projection 19a is provided on the inner peripheral surface of the connection case 19, and the angle θ formed between the upper surface of the projection 19a and the inner peripheral surface of the connection case 19 is 120 degrees in this example. Protrusion 19
The angle α between the “a” and the inner peripheral surface of the connection case 19 is formed to be 120 degrees, and the outer shape of the cross section of the projection 19 a is formed in a substantially rectangular shape. In this case, the angle β of the tip of the projection 19a is 60 degrees. The tip of the projection 19a is formed in a convex curved surface (FIGS. 2 and 3). The angle of θ = 120 degrees is suitable for a case where importance is attached to flood control measures in an area where houses are dense and there are many paved roads. In addition, the water collecting basin 24 and the storage infiltration basin 26 are respectively buried underground. The catch basin 24 is connected to a sewer pipe, not shown, and a soil 29 having a relatively large particle size is arranged on the lower surface of the storage seepage basin 26 so as to easily penetrate the rainwater 12 stored in the seepage basin 26. (FIG. 1).

The operation of the thus configured rainwater distribution pipe will be described with reference to FIGS. At the time of light rain early in the rainfall (A to B in FIG. 4), the rainwater 12 is covered with a roof (not shown).
Flows down from the rain gutter 11 through the short pipe 13 and the first pipe 21 together with the sand and dust accumulated on the first pipe 21. At this time, the rainwater 12 remains attached to the inner peripheral surfaces of the short pipe 13 and the first pipe 21, that is, flows down in a layered manner as an attached flow, and the vertical portion 27
Flows into. As shown by the dashed arrow in FIG. 2, the rainwater 12 flows down in a layered manner while adhering to the inner peripheral surface of the vertical portion 27 even after climbing over the projection 19 a on the inner peripheral surface of the connection case 19,
The water flows into a sewer (not shown) via the horizontal pipe 20a, the second pipe 22, and the water collecting basin 24. As a result, the rainwater 12 containing a lot of sand and dust flows only to the outer pipe 16 and the inner pipe 1
7, the gap between the particles of the soil 29 on the lower surface of the storage infiltration basin 26 is not clogged with sand or dust contained in the rainwater 12. Also, the amount of rainwater 12 flowing into the sewer pipe per unit time increases as the rainfall intensity increases (ab in FIG. 4).

When the rainfall intensity is increased and the rainfall becomes moderate (B to C in FIG. 4), the rainwater 12 flowing into the branch pipe 14 is discharged as shown in FIG.
A certain amount of adhered flow that flows down while being attached to the inner peripheral surface of the vertical portion 27 even when it climbs over the protrusion 19a as shown by the broken arrow of
As indicated by the two-dot chain line arrow, the jump is made by the projection 19a, separated from the inner peripheral surface of the vertical portion 27, and separated into the separated flow flowing into the inner pipe 17. The rainwater 12 that has become the attached flow is a horizontal pipe 20.
a, the rainwater 12 that has flowed into the sewer pipe through the second pipe 22 and the water collecting basin 24,
It is temporarily stored in the storage infiltration tank 26 through the pipe 23.
Moreover, since these rainwaters 12 are relatively clean, containing little sand or dust, the gaps between the soil 29 particles on the lower surface of the storage infiltration basin 26 are not clogged, and the rainwater 12 stored in the storage infiltration basin 26 is The water penetrates into the soil 29 on the lower surface of the infiltration basin 26 to become groundwater. Further, the amount of rainwater 12 flowing into the sewer pipe per unit time hardly changes even when the rainfall intensity increases (b to c in FIG. 4).

When the rainfall intensity further increases and heavy rainfall occurs (C to D in FIG. 4), all of the rainwater 12 flowing into the branch pipe 14 jumps at the projection 19a as shown by the two-dot chain arrow in FIG. It separates from the inner peripheral surface of the part 27 and flows into the inner pipe 17. This rainwater 12 is temporarily stored in the storage infiltration tank 26,
The water penetrates into the soil 29 on the lower surface of the infiltration basin 26 to become groundwater. As a result, the rainwater 12 that has fallen on the roof of the house does not flow into the sewer sewer at all, and the inflow of the rainwater 12 per unit time into the sewer sewer decreases sharply (c to c in FIG. 4).
d), the amount of rainwater 12 that flows into the sewer pipe per unit time does not exceed its flow capacity. The operation of the shunt tube 14 from the time of the heavy rain until the rainfall intensity temporarily decreases to stop the rain is the reverse of the above-described operation, and the description thereof will not be repeated.

In the above embodiment, the lower end of the inner pipe is connected to the storage infiltration vessel via the third pipe. However, this is merely an example, and the lower end of the inner pipe is connected to the storage tank via the third pipe. You may. In this case, the rainwater stored in the storage tank can be used as miscellaneous water such as watering the garden, washing water for cars, and water for toilets. Further, the overflow pipe of the storage tank may be connected to a storage infiltration tank.

In the above embodiment, the angle θ between the upper surface of the projection and the inner peripheral surface of the vertical portion of the outer tube is set to 90 degrees, so that flood control measures can be performed in an area where houses are dense and there are many paved roads. However, when the main purpose is to recharge groundwater and use rainwater as miscellaneous water, the angle θ is set to 90 degrees as shown in FIG. May be formed in parallel with the upper surface of the projection 59a. The tip of the projection 59a is formed in a convex curved surface. In the protrusion 59a configured as described above, most of the rainwater flowing into the diversion pipe 54 has the protrusion 59 when the rainfall intensity becomes about the middle rainfall.
It jumps at a and separates from the inner peripheral surface of the vertical part 27, and is stored in the storage infiltration basin or storage tank through the inner pipe.

As a result, the rainwater stored in the storage infiltration tank permeates the soil to recharge the groundwater, and the rainwater stored in the storage tank can be used as miscellaneous water. In FIG. 5, the same reference numerals as those in the above-described embodiment indicate the same parts. The angle θ can be changed as appropriate according to the ratio of the area of the house or paved road to the total area of the area or the topography of the area.When the flood control measures are important, the angle θ is large, and it can be used as groundwater recharge and rainwater miscellaneous water. When importance is attached to the use of the angle θ, the angle θ is determined to be small.

In the above embodiment, the lower end of the first pipe and the upper end of the upper case fit tightly, the upper end of the second pipe and the horizontal pipe of the lower case fit tightly, and
Although the upper end of the pipe and the lower end of the inner pipe are fitted tightly, when connecting the branch pipe of the present invention in the middle of the existing downspout, the outer diameter of the downspout differs depending on the gutter manufacturer. Or the nominal size may vary depending on the size of the roof. As shown in FIG. 6, in order to cover all the downspouts having different outer diameters with one type of diversion pipe, as shown in FIG. Of the divided downspouts 81, the upper end of the upper case 78 is loosely fitted to the lower end of the upper downspout 81a, fixed with bolts 82 and nuts 83, and the lower downspout 8
The inner tube 7 protruding from the lower end of the lower case 80 at the upper end of 1b
7 may be loosely inserted and fixed with bolts 82 and nuts 83.

In this case, the horizontal tube 80a of the lower case 80
Are formed in a divergent shape, and a horizontal pipe 8 is provided at the upper end of the second pipe 22.
If Oa is loosely inserted and fixed with bolts 82 and nuts 83, the flow dividing pipe 74 becomes detachable, and the replacement of the current dividing pipe 74 becomes easy. As a result, when the purpose, such as flood control measures or use of rainwater as miscellaneous water, is changed, it is only necessary to replace the diverter pipe 74 with the projection 19a having a shape suitable for the purpose. 84, 85 and 86 are seal members. In FIG. 6, the same reference numerals as those in the above-described embodiment indicate the same parts. Further, as a structure in which the branch pipe is detachably provided, the branch pipe may be detachably held by a holder which is driven or fixed to the wall of the house without using bolts and nuts.

In the above embodiment, the rainwater channel is a rain gutter provided on the periphery of the roof of a house. However, the present invention is not limited to this, and a rainwater groove provided on the periphery of the roof of a building may be used.
Further, in the above embodiment, the funnel was inserted at the upper end of the inner tube,
If the rainwater jumped off by the projections can flow into the inner tube without the funnel, the funnel becomes unnecessary.

[0021]

As described above, according to the present invention, the lower end of the outer pipe connected to the lower part of the rainwater flow passage receiving the rainwater whose upper end has fallen on the roof or roof of a house is connected to the sewer sewer. Connect the lower end of the inner pipe with the outer peripheral edge of the upper part arranged at a predetermined distance from the inner peripheral surface of the vertical part to one or both of the rainwater storage and infiltration basin and the storage tank Since a ring-shaped projection is provided on the inner peripheral surface of the vertical portion of the outer tube only a predetermined distance above the upper end of the inner tube, a large amount of sand and dust accumulated on the roof or rooftop during a small rainfall in the early stage of rainfall. By flowing all rainwater into the sewer sewer, clogging of the storage infiltration basin can be prevented. It is possible to prevent the inflow of rainwater exceeding their flow capacity.

Further, the diversion pipe of the present invention can be installed in a small space with a simple structure and is easy to construct, similarly to the conventional diversion pipe for rainwater flowing down. Further, by providing the branch pipe detachably, its construction is further facilitated, and it is also easy to change purposes such as flood control measures and use as rainwater for miscellaneous use. Also, when the rainfall intensity is small and the thickness of the rainwater layer flowing down while adhering to the inner peripheral surface of the outer pipe is extremely small,
Compared with the conventional drainage pipe for rainwater, which is difficult to adjust the distance between the upper outer diameter of the inner pipe and the inner diameter of the vertical part of the outer pipe, the rainfall intensity allows the water to be automatically divided into the sewer sewer and the storage infiltration basin. Very easy to handle. Furthermore, by setting the angle formed between the upper surface of the projection and the inner peripheral surface of the outer pipe to a predetermined value, that is, an angle suitable for each area in different environments, the flow is divided into the sewer pipe and the storage infiltration basin or storage tank. You can change the proportion of rainwater you do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram showing a rain water flow facility including a down stream pipe of rain water flowing down according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is an enlarged sectional view of a portion B in FIG. 2;

FIG. 4 is a diagram showing an example of the rainfall intensity that changes with the passage of time by a solid line, and a broken line showing the amount of rainwater flowing into a sewer pipe per unit time with respect to the rainfall intensity.

FIG. 5 is a sectional view corresponding to FIG. 3, showing another embodiment of the present invention.

FIG. 6 is a sectional view corresponding to FIG. 2 and showing still another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 11 rain gutter (rainwater flow path) 12 rainwater 13 short pipe (hanging part) 14, 54, 74 branch pipe 16, 56, 76 outer pipe 17, 77 inner pipe 19a, 59a projection 24 water collecting basin 26 storage infiltration basin 27 vertical Department

Claims (3)

(57) [Claims] A vertical part (27) is formed, the upper end is connected to a drooping part (13) of a rainwater flow path (11) for receiving rainwater (12) dropped on a roof or a roof of a house, and the lower end is a sewer pipe. An outer pipe (16, 56, 76) connected to a catchment basin (24) communicating with the culvert; an outer peripheral surface of an upper portion is disposed at a predetermined interval from an inner peripheral surface of the vertical portion (27), The lower end is a downflow rainwater distribution pipe (14, 54, 74) having an inner pipe (17, 77) connected to one or both of a storage infiltration basin (26) and a storage tank for rainwater (12). There; the inner tube (17,7
7) the outer tube (16, 56, 76) above the upper end by a predetermined distance
A downflow rainwater distribution pipe, characterized in that ring-shaped projections (19a, 59a) are provided on the inner peripheral surface of the vertical portion (27). 2. The downflow diversion pipe according to claim 1, wherein a diversion pipe (74) is detachably provided between the hanging part of the rainwater flow path, the water collecting basin, and the storage infiltration basin or the storage tank. . 3. The distribution pipe according to claim 1, wherein the tip of the projection is formed in a convex curved surface.