JPH0791850B2 - Runoff water diversion pipe - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water diversion pipe that diverts rainwater flowing down from a rain gutter to a sewer pipe to a rainwater storage and infiltration basin when the amount of rainfall is large.

[Prior Art] When an area that used to be a farmland or wilderness is urbanized, roofs and paved roads increase, making it difficult for rainfall to penetrate underground, and this is the drainage facility for urban rainwater. Increased flow into sewers and rivers.

Especially in the metropolitan area, the ratio of the impervious area of rainwater due to such urbanization to the total area is as high as 70% to 80%. Therefore, when it rains, both the discharge capacity of the existing sewer pipe and the relative discharge capacity of the river to which it discharges decrease. Rivers that have rarely flooded until recently have been flooded once or twice a year and flooded houses.

Conventionally, as one of the measures to improve the flood control safety of such a relatively large metropolitan area, an attempt was made to install a small-scale rainwater storage facility within the basin to reduce the amount of rainwater flowing into the river itself. Has been done. This rainwater storage facility is called on-site storage, and there is, for example, a rainwater storage and infiltration basin (for example, Syokai 59-178491) that is installed on the premises of each house.

When rainwater is sequentially stored and infiltrated by the storage infiltration basin from the beginning of rain, the storage infiltration basin stores rainwater even if the rainfall intensity (mm / hr) is less than the drainage capacity of the sewer pipe or river. According to the statistics so far, the frequency of rainfall with the risk of exceeding the drainage capacity of sewers and rivers is about 10% of the total. Therefore, when all rainwater is flowed into the storage and seepage basin regardless of the amount of rainfall, first of all, the amount of soil particles that are lower than the seepage basin is reduced by the initial rainfall water, which often has a low rainfall intensity in one rainfall. Since the gaps are saturated and, secondly, the inflow frequency of rainwater is high, the inflow amount of dust is large and the gaps of soil particles are likely to be clogged. Due to these factors, the ability of water to permeate from the infiltration basin to the underground ground layer is reduced.

As a means to improve this point, it is conceivable to provide a water diversion means upstream of the storage infiltration basin to divert rainwater according to the amount of rainwater. However, when applying the water diversion means by the lateral overflow method such as rainwater discharge of sewer and spillway of various water utilization facilities to the above-mentioned storage infiltration basin, the inflow amount of the target is If there is any obstacle before and after the weir, the water level will fluctuate and the desired water diversion effect will not be obtained. Second, the water diversion method diverts the horizontal flow. Therefore, there remains a problem that a new installation space is required on the premises.

In order to solve these problems, it is conceivable to provide a water diversion function in the flow path before the rainwater is transferred to the horizontal flow, for example, in the horizontal part of the rain gutter of the eaves of the house. In this case, the rain gutter horizontal portion is formed into a waterway that divides into two parts, one waterway is connected to the sewer pipe, and the other waterway is connected to the storage infiltration basin. Then, for rainfall up to a certain scale, one side of the water channel collects and flows down, and for more rainfall, one channel overflows and the other channel flows. As a result, it is possible to prevent unnecessary inflow of rainwater into the storage infiltration basin.

It is also possible to equip the vertical pipe, which is the vertical part that flows in from the horizontal part of the rain gutter of the eaves part of the house, with a water diversion function (for example, the water diversion device in Japanese Utility Model Sho 54-140320). The water diversion device in Japanese Utility Model Publication No. 54-140320 discloses a water diversion device having a vertical pipe, a branch pipe connected to the vertical pipe, and a tubular floor having an opening surrounded by a vertical wall. . According to this water diversion device, the rainwater flowing down from the vertical pipe is once blocked by the floor and the flowing direction is changed from the inner wall at the upper part of the vertical pipe to the branch pipe, and the height of the blocked water is increased. When it rises above the height of the vertical wall, rainwater at the upper edge of the rising water level is discharged to the vertical pipe through the opening. By connecting the storage infiltration basin to the vertical pipe of this water diversion device, it is possible to prevent unnecessary rainwater from flowing into the storage infiltration basin.

[Problems to be solved by the invention] However, the method of dividing the horizontal part of the rain gutter into two parts is that since the horizontal part is open and rainwater does not normally flow down, dust, leaves, etc. will enter the waterway after many years. Accumulate and reduce the flow-down cross-sectional area, and the desired effect cannot be obtained. In addition, this method requires replacement of all rain gutters in each house, which requires enormous project cost and period.
Furthermore, this method is extremely difficult to realize because it may be damaged due to the weight of snow added to the rain gutter during snowfall.

On the other hand, installing a water diversion device in the actual opening 54-140320 on the vertical pipe means that the rainwater is once dammed to the floor, so that when the dammed water is blocked, the initial rainwater contains a relatively large amount of coarse dust. However, it is difficult to effectively remove the coarse dust that enters from the rain gutter due to the agitation with the newly flowing relatively clean rainwater. In addition, since rainwater is dammed on the floor, dust may accumulate on the floor over time, and the desired effect may not be obtained due to the reduction in storage volume.

An object of the present invention is to provide a water pipe for spilling rainwater that diverts rainwater from a rain gutter to a storage infiltration pit only when the rainfall intensity exceeds the drainage capacity of a sewer pipe or a river.

Another object of the present invention is to provide a diversion pipe for running rainwater which can be installed in a small space of an existing rain gutter with a simple structure and which can be easily installed and handled.

Still another object of the present invention is to provide a diversion pipe for running rainwater that removes coarse dust entering from the rain gutter to prevent clogging of the storage infiltration basin.

[Means for Solving the Problems] The present inventor has determined that in the vertical portion of a rain gutter, rainwater flows down in layers along the inner peripheral surface thereof, and the thickness of the layer changes according to the rainfall intensity. Focusing attention, the present invention has been completed.

A configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 7.

The first invention of the present application is a water diversion pipe having a double structure of an outer pipe 20 and an inner pipe 40 as shown in FIG. A vertical portion 26 is formed on the outer tube 20. The upper end 22 of the outer pipe is connected to the hanging part 16 of the rain gutter 10, and the lower end 24 of the outer pipe 22 communicates with the sewer pipe.
Connected to. Further, the inner pipe 40 is arranged close to the inner peripheral surface 28 of the vertical portion 26 so that the upper end 46 thereof separates the layer of rainwater flowing along the inner peripheral surface 28 of the vertical portion 26 of the outer pipe 20, and the lower end thereof. 44
Is connected to the rainwater storage and infiltration basin 12.

The second invention of the present application is a diversion pipe for falling rainwater having a triple structure of an outer pipe 20, an inner pipe 40 and a dust removing pipe 70 as shown in FIG. 7. In the dust removing pipe 70, the outer peripheral surface of the upper portion 72 is arranged at a predetermined distance from the inner peripheral surface of the inner pipe 40, and the lower portion 74 thereof is provided so as to penetrate each side portion of the inner pipe 40 and the outer pipe 20.

[Operation] Rainwater flowing down from the rain gutter 10 flows down in layers along the inner peripheral surface 28 of the outer pipe 20. When the rainfall intensity does not exceed the drainage capacity of the sewer pipe or river, the layer thickness is t
Since it is smaller, it flows down only to the outer pipe 20, flows to the sewer pipe through the water collecting basin 14, and does not flow to the inner pipe 40.

During a large-scale rainfall whose rainfall intensity exceeds the flow capacity of a sewer pipe or the like, the thickness of the water flow layer on the inner peripheral surface 28 is the interval t.
Since it is larger, the upper end 46 of the inner pipe 40 has a vertical portion of the outer pipe 20.
A layer of rainwater that flows along the inner peripheral surface 28 of 26 and exceeds the interval t is peeled off, and the rainwater flows down to the inner pipe 40. The rainwater that has flowed into the storage and infiltration basin 12 is once stored in the basin 12, and then permeates into the ground and is diffused.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, 10 is a rain gutter, 12 is a rainwater storage and infiltration basin, and 14 is a water collection basin. The water collecting basin 14 is connected to a sewer pipe outside the drawing. The water diversion pipe of this embodiment is a molded product of vinyl chloride and is a double pipe composed of an outer pipe 20 and an inner pipe 40. Outer tube 20
The upper end 22 is connected to the hanging part 16 of the rain gutter 10 where rainwater falls, and the lower end is buried in the ground and connected to the water collecting basin 14. In this example, the outer tube 20 is formed with a vertical portion 26 having substantially the same diameter from the upper end 22 to the vicinity of the ground 18. An upper portion 42 of the inner pipe 40 is provided inside the outer pipe 20, and a lower end 44 of the inner pipe 40 is connected to the storage permeation basin 12. As shown in detail in FIGS. 2 and 3, the inner pipe 40 is formed so as to widen toward the upper end, and the upper end 46 thereof forms a layer of rainwater flowing along the inner peripheral surface 28 of the vertical portion 26 of the outer pipe 20. It is arranged close to the inner peripheral surface 28 of the vertical portion 26 so as to be peeled off. Inner pipe
The distance t between the upper end 46 of the 40 and the inner peripheral surface 28 is set according to the drainage capacity of the sewer pipe and the river. In this example, the interval t is 15
mm.

In contrast to the water pipe having such a structure, first, when small and medium-sized rainfall flows from the gutter 10, the rainwater flowing on the inner peripheral surface 28 of the outer pipe 20 in the double pipe portion is at the interval t. And does not separate from the inner peripheral surface 28. Therefore, the rainwater from the rain gutter 10 flows only into the water collecting basin 14 and flows down to the gutters and sewer pipes arranged on the road (not shown).

Further, when a large-scale rainfall flows in from the gutter 10, the layer thickness of the water flow on the inner peripheral surface 28 becomes larger than the interval t, so that the upper end 46 of the inner pipe 40 is located at the vertical portion 26 of the outer pipe 20. An inner pipe 40 is formed by removing a layer of rainwater that flows along the inner peripheral surface 28 and exceeds the interval t.
Let the rainwater flow down. Therefore, the rainwater also flows into the inner pipe 40 of the double pipe and flows into the storage infiltration basin 12. Here, rainwater is stored and at the same time permeates and diffuses into the ground. Rainwater does not flow into the storage infiltration basin except during large-scale rainfall, and there is still a gap in the infiltration basin 12 and the ground in the vicinity thereof, so that sufficient infiltration capacity is secured.

4 to 6 show another embodiment of the present invention. 4 to 6, the same symbols as in FIG. 1 indicate the same parts.
In this example, an enlarged portion 30 and an inclined portion 32, 33 having an enlarged inner diameter are formed in a part of the vertical portion 26 of the outer pipe 20 near the ground 18. Inside the enlarged portion 30 and the inclined portions 32 and 33, the inner pipe 40
An upper portion 42 of the is provided. An adjustment pipe 50 made of vinyl chloride is screwed onto the upper portion 42 of the inner pipe 40. The upper end of the adjusting tube 50 has a cutting edge shape in cross section and is arranged near the inclined portion 32. When the adjustment tube 50 rotates, it moves in the vertical direction, and the distance between the outer peripheral edge 52 of the upper end of the adjustment tube 50 and the inner peripheral surface 34 of the inclined portion 32 is within the range of t ₁ to t ₂ due to the rotation of the adjustment tube 50. It can be adjusted. In this example, t ₁ is 20 mm and t ₂ is 10 mm. Also slope
An opening 36 is provided in 32. A vinyl chloride cover tube 60 is slidably fitted to the vertical portion 26 on the outer peripheral surface of the inclined portion 32. On the inner surface of the cover tube 60, the opening 36 of the inclined portion 32 is formed.
A bulging portion 62 that serves as a lid is formed (FIG. 6). The bulging portion 62 projects in and out of the opening portion 36 due to the elastic force, and its inner surface is flush with the inner peripheral surface 34 of the inclined portion 32.

In the water pipe having such a configuration, when the cover pipe 60 is moved upward from the inclined portion 32, and the adjustment pipe 50 is turned by putting a hand in the opening portion 36, the inside of the inclined portion 32 forming a part of the vertical portion 26 is removed. Circumferential surface 34 and inner tube 40
The distance between the upper end of the adjustment tube 50 and the outer peripheral edge 52 of the adjustment tube 50 can be changed.

Figure 6 shows the distribution of rainwater flowing from the gutter to the outer pipe 20 during large-scale rainfall. At the slope 32, the water flow has a thickness of 30
If it is about mm or less, the water flow will not be separated until the angle α formed by the inner peripheral surface 34 of the inclined portion 32 and the vertical portion is about 45 ° to 60 °.

The rainwater R that reaches the opening 36 of the inclined portion 32 is brought into close contact with the inclined portion 32 by the bulging portion 62 of the cover tube 60 and flows down smoothly. As in the previous embodiment, rainwater R ₁ that exceeds the flow capacity of a sewer pipe or the like is separated and guided to the inner pipe 40, and other rainwater R ₂ flows down the outer pipe 20. When leaves or dust are caught on the outer peripheral edge 52 of the adjusting tube 50, the cover tube 60 can be moved upward and removed from the opening 36.

7 and 8 show still another embodiment of the present invention. In both figures, the same reference numerals as in FIG. 1 indicate the same parts. The water dividing pipe in this example is a triple pipe including an outer pipe 20, an inner pipe 40, and a dust removing pipe 70. That is, the dust removal pipe 70 has a cross section of approximately L in this example.
It is in the shape of a letter, and the cross section of its upper end is in the shape of a cutting edge. Dust removal pipe
The outer peripheral surface of the upper portion 72 of the 70 is arranged at a predetermined distance S from the inner peripheral surface of the inner pipe 40. Further, the lower portion 74 of the dust removing pipe 70 is provided so as to penetrate each side portion of the inner pipe 40 and the outer pipe 20. Further, seven guide plates 37 are vertically provided on the inner peripheral surface of the inclined portion 32 of the outer tube 20. These guide plates 37 are formed of a thin plate so as not to disturb the flow of rainwater in the outer pipe 20, and are formed so as to guide coarse dust such as leaves falling down the outer pipe 20 to the dust removing pipe 70.

In the water pipe having such a structure, rainwater is divided by the outer pipe 20 and the inner pipe 40 when the amount of water flowing down increases, as in the previous embodiment. Further, when coarse dust such as leaves falls from the hanging portion of the rain gutter, the coarse dust enters the dust removing pipe 70 by being guided by the guide plate 37 and can be discharged from the lower portion 74 to the outside of the outer pipe 20. . Further, the dust removing pipe 70 also functions as a spillway when the distance between the outer pipe 20 and the inner pipe 40 and the distance between the inner pipe 40 and the dust removing pipe 70 are both clogged with leaves, or when the rainfall intensity is extremely large. .

Although the cover tube 60 is shown as an example of the lid of the opening 36 of the inclined portion 34, the lid of the opening 36 is not limited to this and may be a door type.

Further, although the example in which the enlarged portion 30 is provided in a part of the vertical portion 26 is shown, it may be formed in a reduced portion having a reduced inner diameter.

Furthermore, the numerical values of the intervals shown in the above example are examples, and the present invention is not limited to this.

[Effects of the Invention] As described above, the present invention has the following effects.

Since the rainwater flowing down from the rain gutter is divided by the slit of the double pipe extending in the vertical direction, the installation space can be minimized.

The water diversion pipe of the present invention can be easily installed by the construction of only the lower end of the existing gutter of the gutter.

The water diversion reduces the frequency of rainwater flowing into the storage infiltration basin, and the infiltration capacity can be effectively utilized.

A part where the inner diameter changes is provided in a part of the vertical part of the outer tube,
Moreover, if the upper part of the inner pipe can be moved up and down, the width of the slit of the double pipe can be easily changed and the water diversion ratio can be adjusted.

By providing an opening in the outer tube near the upper end of the inner tube, it is possible to easily adjust the slit and remove dust clogging the slit.

When the lid of the opening is opened, the internal structure of the water diversion pipe can be seen at a glance, so it is easy to understand the necessity of controlling the flow of rainwater when installed in a general household.

If a dust removal pipe is provided to form a triple structure, coarse dust can be discharged from the dust removal pipe. As a result, first of all, it is possible to avoid blockage of the diversion pipe due to coarse dust, secondly it is possible to have the function of spillway for abnormal rainfall, and thirdly, to store and infiltrate the conventional total rainwater. It can be expected that the infiltration basin, which had been clogged with dust in 2 to 3 years, will not be clogged in the storage osmosis basin for 20 to 30 years when it is made to flow.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing a rain water flow facility including a water diversion pipe according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a fragmentary sectional view of a water diversion pipe according to another embodiment of the present invention. FIG. 5 is an external front view of FIG. FIG. 6 is a sectional view taken along the line CC of FIG. FIG. 7 is a cross-sectional configuration diagram of a water diversion pipe according to still another embodiment of the present invention. FIG. 8 is a sectional view taken along line DD of FIG. 7. 10: Rain gutter, 12: Rainwater storage and infiltration basin, 14: Water collection basin, 20: Outer pipe,
26: vertical portion of outer pipe, 28, 34: inner peripheral surface of outer pipe, 36: opening of outer pipe, 37: guide plate, 40: inner pipe, 46, 52: outer peripheral edge of inner pipe, 60: cover Tube, 70: dust removal tube.

Claims (6)

[Claims] 1. A water collecting basin (14) in which a vertical part (26) is formed, an upper end (22) is connected to a hanging part (16) of a rain gutter (10), and a lower end (24) communicates with a sewer pipe. ) Outer tube connected to ()
And an inner peripheral surface (28) of the vertical portion (26) so that the upper end (46) separates a layer of rainwater flowing along the inner peripheral surface (28) of the vertical portion (26) of the outer pipe (20). ), The lower end (44) of which is connected to the rainwater storage and infiltration basin (12) (4)
0) and a water diversion pipe with. 2. An enlarged portion (30) having an inner diameter enlarged to a part of a vertical portion (26) of an outer pipe (20) and an inclined portion (connecting the enlarged portion (30) to the vertical portion (26). 32, 33) are formed, an upper part (42) of the inner pipe (40) is provided inside the enlarged part (30) and the inclined part (32), and the upper part (42) of the inner pipe (40) is formed. The upper end is the inclined part (32)
An adjustment pipe (50) that can be brought close to the inner surface of the adjustment pipe (50) is screwed, and the adjustment pipe (50) is rotated to rotate the adjustment pipe (5).
The downfall rainwater diversion pipe according to claim 1, wherein the distance between the upper end of (0) and the inner surface of the inclined portion (32) can be adjusted. 3. An opening (36) is provided in the outer tube (20) near the upper end of the inner tube (40), and an openable / closable lid is provided in the opening (36). The drain pipe of the falling rainwater according to Item 2 or Item 2. 4. The run-off rainwater diversion pipe according to claim 3, wherein the lid is a cover pipe (60) slidably fitted to the outer peripheral surface of the vertical portion (26). 5. A water collecting basin (14) in which a vertical part (26) is formed, an upper end (22) is connected to a hanging part (16) of a rain gutter (10), and a lower end (20) communicates with a sewer pipe. ) Outer tube connected to ()
And the outer peripheral edge (46) of the upper end is the inner peripheral surface (28) of the vertical portion (26).
And an inner pipe (40) with a lower end (44) connected to the rainwater storage and infiltration basin (12) and an outer peripheral surface of the upper part (72) of the inner pipe (40). Downflow provided with a peripheral surface and a dust removal pipe (70) provided at a predetermined interval and having a lower portion (74) penetrating each side of the inner pipe (40) and the outer pipe (20). Rainwater diversion pipe. 6. A dust removing pipe (7) for collecting dust falling on the vertical portion (26).
The downfall rainwater diversion pipe according to claim 5, wherein a plurality of guide plates (37) for guiding to (0) are vertically provided.