JP2016194235A5 - - Google Patents

Description

Rainwater control device

The present invention relates to a rainwater control device that controls the flow rate of rainwater flowing from a rainwater pipe of a house toward a sewer or the like.

As shown in FIG. 13, rainwater is introduced from a rain gutter (rain water pipe) 31 of a house 30 into a sewage tank (see Patent Document 1) that temporarily stores sewage such as manure and domestic wastewater and discharges it to the sewer. May be. That is, the housing eaves 32 is of a type that communicates with a sewage basin 34 buried in the ground through a vertical sword 33, and the sewage basin 34 also serves as a rainwater basin (see Patent Document 2). In this case, both the sewage generated in the house 30 and the rainwater flowing into the gutter 31 flow into the sewage gutter 34 and are discharged from the sewage gutter 34 to the sewer.

In this type of sewage basin 34, if the amount of rain that flows into the sewage basin 34 from the basin 31 exceeds the amount of drainage from the sewage basin 34 to the sewer, the sewage source 35 (toilet, bath) There is a risk that sewage including rainwater will flow back to the kitchen etc. from the sewage basin 34 and the house will be flooded.

FIG. 13 shows a state in which the inside of the vertical gutter 33 and the eaves wall 32 is full due to the influence of heavy rain, and the rainwater R overflows from the eaves wall 32. When the sewage basin 34 is filled with rainwater flowing from the gutter 31, the sewage in the sewage basin 34 flows from the toilet as the sewage source 35 into the house. The eaves 32 constituting the gutter 31 is located at a position much higher than the sewage basin 34, so the rainwater flowing into the eaves basin 32 is pressurized in the sewage basin 34, and the backflow of sewage to the sewage source 35 is promoted. The This problem is very serious nowadays that are often hit by localized heavy rains due to global warming.

In addition, even when rain gutter rainwater is introduced into a rain gutter dedicated to rain water, when heavy rain rain makes the rain gutter full and it cannot be discharged into the sewer system, there will be a situation where rain water overflows from the eaves and flows under the eaves.

Furthermore, in high-rise apartment buildings, rainwater traps are full during heavy rains, or if the downspout is thin, only the rainwater on the upper floor fills up the downspout, and rainwater accumulates on the veranda of the lower-floor housing. The problem that it ends up also arises.

Therefore, as shown in Patent Documents 3 and 4, the flow rate of rainwater passing through the vertical shaft toward the sewer is regulated, and the regulated rainwater is collected in a water storage tank to solve the above-described problem. Has been proposed.

Japanese Patent Laid-Open No. 9-273166 JP-A-7-292758 Japanese Utility Model Publication No. 7-25055 JP 2008-121274 A

However, in the proposals of Patent Documents 3 and 4, if the water storage tank becomes full, rainwater will not flow toward the sewer or the like in the vertical shaft, and the same problem as described above will occur. In any literature, the water storage tank is provided with a drainage port that can be freely opened and closed (the first drainage port 3 in Patent Document 3 and the rainwater extraction faucet in Patent Document 4). It is operated and does not automatically control the drainage from the water tank.

Further, in Patent Document 3, it is disclosed that a small amount of drainage is always performed from the second drainage port 4 and that it can be drained naturally even after the rain has stopped. The time to drain naturally from a 3000 liter water tank seems to be quite long. For this reason, in the event of intermittent heavy rains, once the water storage tank is full, there is a concern that subsequent heavy rains cannot be handled by natural drainage. What is drained naturally is the garden tip of the residential site, which is really intended for one-time storage "until the rain stops". It cannot be applied to the veranda of high-rise housing.

Furthermore, in the proposal of Patent Document 3, a foldable bag body with a capacity of 3000 liters or the like is used, and in the proposal of Patent Document 4, the garbage discharge pipe 8 is exposed, but these are located near the vertical shaft of the house. The existence of things is problematic both in terms of space and aesthetics.

The present invention has been made in view of the circumstances as described above, and even if there is a concentrated heavy rain in which a large amount of rain in a short period of time continuously falls on a limited area , the sewer system or the like functions. It is an object of the present invention to provide a rainwater control device that does not fall into a fault and does not cause rainwater to stay in the rainwater pipe. In particular, it has a rainwater storage function and a drainage function that limit the inflow of rainwater from the rainwater pipes of houses to sewers, etc., and if the rainfall falls below the limit value, the stored rainwater is drained naturally. It is intended to provide a rainwater control device that is space-saving and has good aesthetics.

In order to solve the above problems, a rainwater control apparatus according to the present invention includes a flow restrictor that restricts a flow rate of rainwater in a rainwater pipe of a house, and a storage tank that receives rainwater restricted by the flow restrictor. An excess water discharge port that discharges rainwater that exceeds the maximum allowable water storage capacity of the tank is formed in communication with the storage tank, and a total discharge port that naturally discharges rainwater in the storage tank communicates with the storage tank. In the case of concentrated torrential rain where a large amount of short-term rain continues to occur in a limited area, rainwater storage in the storage tank is performed during one heavy rain. And the capacity of the storage tank is set so that the storage tank that is full before the next heavy rain comes is substantially emptied in about 15 to 45 minutes. The size of the total discharge outlet is Is the fact characterized (claim 1).

According to the present invention, the flow rate of rainwater in the rainwater pipe is limited by the flow restrictor, and the rainwater whose flow rate is limited is stored in the storage tank. Accordingly, even if concentrate heavy rain, it is possible to prevent sewage or the like is dysfunctional. In particular, a large effect can be obtained by hiring on a large scale with the cooperation of many citizens and local governments.

When the amount of water in the storage tank reaches the maximum allowable amount, rainwater exceeding that amount is discharged from the excess water outlet. Therefore, rainwater does not stay in the rainwater pipe even after the storage tank is full.

When heavy rain stops and the inflow of rainwater into the storage tank stops, all of the rainwater in the storage tank is naturally discharged until it becomes substantially empty. Therefore, it can cope with the next heavy rain. Note that the time until the storage tank is substantially emptied from the allowable maximum water storage state is determined by the capacity of the storage tank and the size of the total discharge port.

In addition, the rainwater control apparatus according to the present invention can be applied not only to a rainwater pipe of a detached house but also to a rainwater pipe of a veranda of each house of a high-rise house.

As a preferred embodiment, the rainwater pipe is vertically divided into two, and the storage tank is disposed around the rainwater pipe so as to wrap the lower end of the upper pipe and the upper end of the lower pipe. It has a cylindrical shape extending in the vertical direction, and has an inward flange at the lower end. The inward flange is liquid-tightly connected to the outer peripheral surface of the lower tube, and the upper tube and the lower tube The gap between is communicated with the inside of the storage tank, the flow restrictor is provided inside the lower pipe, and the rainwater passage hole of the flow restrictor serves as the total discharge port. Item 2).

In this case, rainwater whose flow rate is restricted by the flow restrictor flows into the storage tank through the gap between the upper pipe and the lower pipe. When the heavy rain is settled and the amount of rainfall falls below the limit value by the flow restrictor, the rainwater in the storage tank naturally flows downstream through the gap and the flow restrictor. At this time, since the rainwater passage hole of the flow restrictor becomes the total discharge port, the total drainage time of the rainwater in the storage tank is determined depending on the size (rainwater passage rate) of the rainwater passage hole of the flow restrictor.

In this embodiment, since a cylindrical storage tank extending in the vertical direction is arranged around the rainwater pipe so as to wrap the rainwater pipe, it is space-saving and has good aesthetics.

As a preferred embodiment, a part of the rainwater pipe is cut out to form an opening, and the storage tank is disposed around the rainwater pipe so as to wrap around the opening. It has a cylindrical shape that extends inward, and has an inward flange at the lower end. The inward flange is liquid-tightly connected to the outer peripheral surface of the rainwater pipe, and the opening communicates with the interior of the storage tank. An example in which the flow restrictor is provided inside a rainwater pipe on the downstream side of the opening, and the rainwater passage hole of the flow restrictor serves as the total discharge port (claim 3). In this case, the opening has the same effect as the gap (gap between the upper pipe and the lower pipe).

As a preferred embodiment, in the rainwater control apparatus according to claim 1, a part of the rainwater pipe is cut out to form an opening, and the storage tank is arranged around the rainwater pipe so as to enclose the opening. The storage tank has a cylindrical shape extending in the vertical direction, and has an inward flange at a lower end, the inward flange being liquid-tightly connected to an outer peripheral surface of the rainwater pipe, and the opening. Is communicated with the inside of the storage tank, the flow restrictor is provided in the rainwater pipe downstream of the opening, and is located at the lower part inside the storage tank and downstream of the flow restrictor. An example is shown in which a return hole is formed by cutting out a part of the rainwater pipe, and the return hole serves as the total discharge port (Claim 4). In this case, since the return hole serves as a total discharge port, the total drainage time of rainwater in the storage tank is determined depending on the size of the return hole.

As a preferred embodiment, a mode in which the storage tank is formed by liquid-tight coupling of divided parts that can be combined so as to surround the rainwater pipe is exemplified (Claim 5). If it does in this way, there exists an advantage which can perform the retrofitting operation | work when retrofitting a storage tank with respect to the existing rainwater pipe | tube easily and rapidly.

As one preferred embodiment, a mode in which the storage tank is cylindrical and is installed eccentrically with respect to the rainwater pipe is exemplified (Claim 6). In this case, the storage tank is installed with respect to the rainwater pipe by decentering the storage tank so that the center axis of the storage tank is far from the wall surface of the house. Thereby, even when the clearance gap between a rainwater pipe and the wall surface of a house is small, a storage tank can be reliably attached with respect to a rainwater pipe.

As a preferred embodiment, the storage tank has a cylindrical shape extending in the up-down direction, the storage tank is disposed separately from the rainwater pipe, and excessively flows rainwater in the rainwater pipe into the storage tank. A water transfer pipe is disposed; the flow restrictor is disposed downstream of the rainwater pipe from a connection portion between the excess water transfer pipe and the rainwater pipe; and a lower part of the storage tank is disposed below the flow restrictor by a return pipe. An embodiment in which the rainwater pipe communicates with the downstream side and the opening of the return pipe becomes the total discharge port (Claim 7).

In this embodiment, the rainwater whose flow rate is limited by the flow restrictor flows into the storage tank through the excess water transfer pipe. When the heavy rain is settled and the amount of rainfall falls below the limit value by the flow restrictor, the rainwater in the storage tank flows into the rainwater pipe through the return pipe on the downstream side of the flow restrictor. At this time, since the opening of the return pipe becomes the total discharge outlet, the total discharge time of the rainwater in the storage tank is determined depending on the inner diameter of the return pipe.

As a preferred embodiment, the storage tank has a cylindrical shape extending in the up-down direction, the storage tank is disposed separately from the rainwater pipe, and excessively flows rainwater in the rainwater pipe into the storage tank. A water transfer pipe is disposed; the flow restrictor is disposed downstream of the rainwater pipe from a connection portion between the excess water transfer pipe and the rainwater pipe; and a lower part of the storage tank is disposed below the flow restrictor by a return pipe. An embodiment in which the rainwater pipe communicates with the upstream side on the upstream side, and the opening of the return pipe or the rainwater passage hole of the flow restrictor serves as the total discharge port (Claim 8).

In this embodiment, rainwater whose flow rate is restricted by the flow restrictor flows into the storage tank mainly through the excess water transfer pipe when the opening area of the return pipe is extremely small. When the heavy rain is settled and the rainfall amount falls below the limit value by the flow restrictor, the rainwater in the storage tank flows into the rainwater pipe upstream of the flow restrictor through the return pipe. At this time, since the return pipe opening or the rainwater passage hole of the flow restrictor becomes the total discharge outlet, the rainwater of the storage tank depends on the inner diameter of the return pipe or the size of the rainwater passage hole of the flow restrictor (rainwater passage rate). The total discharge time is determined.

As a preferred embodiment, there is exemplified a mode in which the return pipe also serves as the excess water transfer pipe and the rainwater passage hole of the flow restrictor serves as the total discharge port (claim 9). In this case, the return pipe needs to have a sufficiently large inner diameter so that rainwater whose flow rate is restricted by the flow restrictor can flow into the storage tank without delay. Therefore, depending on the size of the rainwater passage hole of the flow restrictor (rainwater passage rate), the total amount of rainwater discharged from the storage tank is determined.

As a preferred embodiment, the storage tank has a cylindrical shape extending in the up-down direction, the storage tank is disposed separately from the rainwater pipe, and excessively flows rainwater in the rainwater pipe into the storage tank. A water transfer pipe is provided, the flow restrictor is provided on the downstream side of the rainwater pipe with respect to a connection part between the excess water transfer pipe and the rainwater pipe, and a part of the lower part of the storage tank is cut out to form the total amount. An embodiment in which the discharge port is formed is exemplified (claim 10).

In this embodiment, the rainwater whose flow rate is limited by the flow restrictor flows into the storage tank through the excess water transfer pipe. When the heavy rain is settled and the amount of rainfall falls below the limit value due to the flow restriction, the rainwater in the storage tank is discharged to the outside from the entire discharge port formed by cutting out a part of the lower part of the storage tank. At this time, the total drainage time of rainwater in the storage tank is determined depending on the size of the total discharge port.

As an exemplary embodiment, at least a part of the upper end of the storage tank is opened to form an upper end open portion, and the upper end open portion is used as the excess water discharge port (Claim 11). .

As a preferred embodiment, there is exemplified a mode in which the upper end of the storage tank is sealed and the excess water discharge port is provided by cutting out a part of the upper part of the peripheral wall of the storage tank (claim 12). That is, the excess water discharge port does not have to be upward, and can be disposed sideways with respect to the storage tank.

As a preferred embodiment, at least a part of the upper end of the storage tank is opened to form an upper end open portion, the upper end open portion serves as the excess water discharge port, and the upper end open portion of the storage tank The aspect which the outer end part of the said excess water transfer pipe is opening toward is illustrated (Claim 13). The upper end opening part may be provided with a net-like dust-removable dust guard.

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As a form of preferred embodiment, the excess water outlet, illustrate embodiments that are formed on the rainwater pipe upstream of the reservoir tank (claims 1-4).

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It is explanatory drawing of the piping system of a rainwater pipe and a sewage tank including the rainwater control apparatus which concerns on one Embodiment of this invention. It is an expanded sectional view of the principal part of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing which shows the specific example for enabling adjustment of the rainwater passage rate by a flow-rate throttle. It is explanatory drawing of the piping system of the rainwater pipe and sewage tank of a prior art example. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is an explanatory view of a modification of the Figure 15. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG. It is explanatory drawing of the modification of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a sewage tub 2 corresponding to a house 1 is buried in the ground of a house premises, and a sewage pipe 3 and a rainwater pipe 4 communicate with the sewage tub (house sewage tub) 2. The sewage tank 2 is known per se, receives and stores house sewage such as manure and household wastewater, and discharges the stored water to the sewer through the sewage drain pipe 5. Since the configuration of the sewage tank itself is not related to the gist of the present invention, the description thereof is omitted.

In FIG. 1, as an example of the sewage source 6 and the sewage pipe 3, a toilet (toilet) in a house and a sewage pipe extending from the toilet to the sewage tub 2 are illustrated. Although not shown, other sewage sources 6 include a kitchen sink, a bathroom, and a laundry.

The rainwater pipe 4 includes a ground pipe 7 and a buried pipe 8. The ground pipe 7 is a rain gutter of a house, and is composed of an eave fence 9 disposed along the eaves of the house 1 and a vertical fence 10 extending from the eave fence 9 to the ground outside the house. This vertical gutter 10 is connected to a buried pipe 8 disposed in the ground, and this buried pipe 8 is connected to the sewage tank 2. In the example of FIG. 1, two combinations of the vertical gutter 10 and the buried pipe 8 are provided for one eaves. However, the combination of the vertical gutter 10 and the buried pipe 8 may be at least one system. .

As another example of FIG. 1, as shown in FIG. 10, it may have a structure in which rainwater downpipes 10 are introduced into the cash forte rainwater dedicated rainwater basins 2a in wastewater basins 2.

As shown in FIG. 1, a storage tank 19 is disposed in the lower part of the vertical rod 10.

As shown in FIG. 2, the storage tank 19 is a cylindrical member extending in the up-down direction. The storage tank 19 is arranged around the rainwater pipe 4 so as to wrap around the lower end 13a of the upper ridge (upper pipe) 13 and the upper end 14b of the lower ridge (lower pipe) 14 of the vertical ridge 10 divided into two parts. Arranged. The storage tank 19 may be a cylindrical type, a rectangular tube type, or a combination type thereof. However, since the vertical rod 10 is usually cylindrical, it is considered that the appearance of the storage tank 19 is good if it is cylindrical.

In the case where the storage tank 19 is installed in the existing vertical gutter 10, it is preferable that the storage tank 19 is formed by liquid-tight coupling of divided parts that can be combined so as to surround the vertical gutter 10. For example, a mode in which the storage tank 19 is formed in a cylindrical shape around the vertical rod 10 by combining two semi-cylindrical divided parts, or a semi-cylindrical or U-shaped first divided part and a flat plate-like first part. In this embodiment, the storage tank 19 is formed around the vertical rod 10 by the combination with the two divided parts. If it does in this way, there exists an advantage which can perform the retrofitting operation | work when retrofitting a storage tank with respect to the existing vertical shaft easily and rapidly.

The storage tank 19 includes an inward flange 18 serving as a tank bottom surface at a lower end, and at least a part of the upper end is open. The inward flange 18 at the lower end is liquid-tightly connected to the outer peripheral surface of the lower flange 14. A gap between the upper rod 13 and the lower rod 14 communicates with the inside of the storage tank 19 so that rainwater flowing through the vertical rod 10 can also flow into the storage tank 19. The upper end opening of the storage tank 19 becomes an excess water discharge port 20. In FIG. 2, all of the upper end of the storage tank 19 is opened as the excess water discharge port 20. However, the present invention is not limited to this, and a part of the upper end of the storage tank 19 is opened as the excess water discharge port 20. You can also.

The inward flange 18 serves as a bottom surface of the storage tank 19 and also serves to fix the storage tank 19 and the vertical rod 10.

In the example of FIG. 2, a lid 21 that automatically opens and closes the excess water discharge port 20 is provided. The lid 21 always closes the excess water discharge port 20 and automatically opens the excess water discharge port 20 by the water pressure in the storage tank 19.

The lid 21 is always supported by the lid receiver 22. The lid receiver 22 is water-permeable such as a net, and is disposed between the inner peripheral surface of the storage tank 19 and the outer peripheral surface of the upper ridge 13, and is located at the upper part inside the storage tank 19. . A hole 23 for receiving the upper flange 13 is formed at the center of the lid 21. Guided by this hole 23, the lid 21 moves up and down along the upper ridge 13, and the excess water discharge port 20 is automatically opened and closed according to the water pressure in the storage tank 19.

The lid receiver 22 also serves to fix the storage tank 19 and the vertical gutter 10.

By providing the lid 21, the excess water discharge port 20 is always closed except when it is necessary to discharge excess water, so that foreign matter can be prevented from entering from the excess water discharge port 20. Providing the lid 21 is particularly effective when the excess water discharge port 20 is directed upward. However, the arrangement of the lid 21 is arbitrary.

The lid 21 may close the excess water discharge port 20 only by its own weight, or may close the excess water discharge port 20 by its own weight plus spring force.

In the example of FIG. 2, a flow restrictor 24 is provided in the lower rod 14. The flow restrictor 24 includes a rainwater passage hole 24 a and a flow restrictor surface 24 b, and the flow restrictor surface 24 b narrows the flow area of the lower side wall 14, thereby restricting the flow rate of rainwater in the rainwater pipe 4. The rainwater whose flow rate is restricted by the flow restrictor 24 is stored in the storage tank 19 through the gap between the upper ridge 13 and the lower ridge 14. When the amount of rain is so large that the storage tank 19 is full, excess rainwater exceeding the allowable maximum water storage amount of the storage tank pushes up the lid 21 on the lid receiver 22 and flows out from the excess water discharge port 20 to the outside.

The excess water discharge port 20 is for preventing rainwater from staying in the rainwater pipe 4 upstream of the flow restrictor 24 by discharging rainwater exceeding the allowable maximum water storage amount of the storage tank 19 to the outside. . Therefore, the excessive water discharge port 20 needs an opening area that does not allow rainwater to stay in the rainwater pipe 4 upstream of the flow restrictor 24 even in heavy rain.

For the same reason, the gap between the upper rod 13 and the lower rod 14 is large enough to allow the rainwater whose flow rate is restricted by the flow restrictor 24 to flow into the storage tank 19 without staying in the vertical rod 10. is necessary. It should be noted that the vertical dimension of the gap between the upper rod 13 and the lower rod 14 can be extended to the vicinity of the upper end of the storage tank 19, as shown in FIG.

By providing the flow restrictor 24, the amount of rainwater flowing into the sewage basin 2 and thus into the sewerage system is limited in advance. Can prevent backflow. Since rainwater exceeding the maximum allowable water storage capacity of the storage tank 19 is discharged to the outside from the excess water discharge port 20, rainwater does not stay in the rainwater pipe 4 on the upstream side of the flow restrictor 24. Therefore, the downpipe 10 is filled with rainwater, and there is no problem of rainwater overflowing from the eaves 9 to the eaves.

When one heavy rain becomes light rain and the inflow of rainwater into the storage tank 19 stops, the rainwater stored in the storage tank 19 naturally flows out to the downstream side through the rainwater passage hole 24a of the flow restrictor 24. That is, in the example of FIG. 2, the rainwater passage hole 24 a of the flow restrictor 24 serves as a total discharge port for discharging the rainwater in the storage tank 19 naturally until the storage tank 19 becomes substantially empty. Therefore, the total drainage time of rainwater in the storage tank 19 is determined by the capacity of the storage tank 19 and the size of the rainwater passage hole 24 a of the flow restrictor 24. Since the storage tank 19 is emptied, it can cope with the next heavy rain.

As will be described later with reference to FIG. 12, it is preferable that the rainwater passage rate of the flow restrictor 24 can be adjusted steplessly. As a result, the flow rate of rainwater passing through the flow restrictor 24 can be adjusted. 24 rainwater through excessive rate of flow restrictor is preferably adjusted so that the storage tank 19 becomes full with rainwater is substantially empty in about 30 minutes.

In the example of FIG. 2, the cylindrical storage tank 19 extending in the vertical direction is arranged around the vertical gutter 10 so as to wrap the vertical gutter 10, so that it is space-saving and aesthetically pleasing.

Instead of the above-described configuration, as shown in FIG. 3, the excess water discharge port 20 at the upper open end of the storage tank 19 is closed and sealed with a lid 20 a, and the upper portion around the storage tank 19 is sealed. A new excess water discharge port 20b may be provided sideways at a position close to the upper end portion by cutting out a part. In this case, the lateral excess water discharge port 20b may be covered with a lid (not shown) that can be automatically opened and closed according to the water pressure, or may be configured without the lid.

The excessive water discharge port 20b newly provided in FIG. 3 also shows that rainwater stays in the rainwater pipe 4 upstream of the flow restrictor 24 by discharging rainwater exceeding the allowable maximum water storage amount of the storage tank 19 to the outside. It is for preventing. Therefore, it is a matter of course that the excess water discharge port 20b needs an opening area that does not allow rainwater to stay in the rainwater pipe 4 upstream of the flow restrictor 24 even in heavy rain.

FIG. 4 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 2 are denoted by the same reference numerals as those in FIG. The flow restrictor 24 is moved to the upper part of the storage tank 19. An opening 40 formed by cutting out a part of the vertical shaft 10 is disposed on the upstream side of the flow restrictor 24. A space defined by the inner peripheral surface of the storage tank 19, the outer peripheral surface of the vertical rod 10, and the inward flange 18 at the lower end of the storage tank 19 is a water storage area. The capacity of the storage tank 19 is, for example, 200 to 300 liters.

A part of the vertical rod 10 is cut out at a position above the inward flange 18 to form a return hole 99. The return hole 99 is a total discharge port for slowly returning the rainwater in the storage tank 19 to the downpipe 10 on the downstream side of the flow restrictor 24 little by little after one heavy rain has settled. By appropriately setting the size of the return hole 99, it is possible to adjust the return time of rainwater from the return hole 99 to the vertical rod 10 (the total drainage time of rainwater in the storage tank 19). The size of the return hole 99 is preferably set so that the storage tank 19 is substantially emptied in about 15 to 45 minutes.

Excessive rainwater overflowing from the opening 40 by the action of the flow restrictor 24 flows into the storage tank 19 and is stored in order from the bottom. Rainwater exceeding the maximum allowable amount of water stored in the storage tank 19 pushes up the lid 21 and flows out from the excess water outlet 20 at the upper end of the storage tank 19. When a single heavy rain becomes light rain and the entire amount of rainwater in the downpipe 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 and the water pressure in the storage tank 19 decreases. 21 closes naturally. Thereafter, rainwater in the storage tank 19 flows out from the return hole 99 at the bottom of the storage tank 19 to the downpipe 10. And when the next heavy rain comes again, the water storage function of the storage tank 19 will be exhibited again.

4, similarly to the example of FIG. 3, the excess water discharge port 20 at the upper end of the storage tank 19 is sealed with a lid, and a part of the upper part around the storage tank 19 is sealed. Instead of the excess water discharge port 20, a new excess water discharge port 20 b (escape port) may be provided laterally at a position near the notch and the upper end. In this case, the lateral excess water discharge port 20b (escape port) may be covered with a lid (not shown) that can be automatically opened and closed according to the water pressure, or may be configured without the lid.

Excess water discharge ports 20, 20 b are for preventing rainwater from staying in the rainwater pipe 4 upstream of the flow restrictor 24 by discharging rainwater exceeding the allowable maximum water storage amount of the storage tank 19 to the outside. It is. Therefore, it is a matter of course that the excess water discharge ports 20 and 20b need an opening area that does not allow rainwater to stay in the rainwater pipe 4 upstream of the flow restrictor 24 even in the case of heavy rain.

For the same reason, the size of the opening 40 needs to be large enough to allow the rainwater whose flow rate is restricted by the flow restrictor 24 to flow into the storage tank 19 without staying in the downpile 10.

FIG. 5 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 2 are denoted by the same reference numerals as those in FIG. The difference from the example of FIG. 2 is that instead of dividing the vertical gutter as a rainwater pipe into two vertically, a part of the vertical gutter is cut out to form an opening 40 as in FIG. The flow restrictor 24 is provided inside the vertical shaft 10 on the downstream side of 40. The opening 40 communicates with the excess water discharge port 20 in the storage tank 19.

In the example of FIG. 5, as will be described later with reference to FIG. 12, there is an overlapping small hole 44 a of the rainwater passage holes 44, 44 approaching one side of the two flow restrictors 24, 24 arranged in an overlapping manner. This is a total discharge port for naturally discharging rainwater in the storage tank 19 until the storage tank 19 becomes substantially empty. Accordingly, the total drainage time of the rainwater in the storage tank 19 is determined by the capacity of the storage tank 19 and the size of the small hole 44a overlapping the rainwater passage holes 44, 44 approaching one side of the flow restrictors 24, 24. .

FIG. 6 is also a modification of FIG. Therefore, the same parts as those in the example of FIG. 2 are denoted by the same reference numerals as those in FIG. In this example, the storage tank 19 is cylindrical and is installed eccentrically with respect to the vertical shaft 10. This aspect is also applicable to FIGS. In this embodiment, the storage tank 19 is installed on the downpipe 10 by decentering it so that the central axis X1 of the storage tank 19 is far from the wall surface W of the house with respect to the central axis X2 of the downpipe 10. . Thereby, even when the gap between the downpile 10 and the wall surface W of the house is small, the storage tank 19 can be reliably attached to the downpile 10.

The examples of FIGS. 2 to 6 are of course applicable to the downside of a detached house, but are particularly suitable when applied to the downside of a veranda of a high-rise house. That is, in a high-rise house, there is a problem that the rainwater basin becomes full during heavy rain, and the rainwater stays on the veranda of the lower-floor house. Therefore, with a storage tank 19, an example of FIGS. 2-6 with a water storage function, by applying to the downpipe of the veranda floor of high-rise apartment (especially lower Sokai), rainwater will be accumulated in the veranda at the same time when the problem is resolved that, it is possible to prevent the malfunction of the sewer at the time of concentrate heavy rain. Of course, the larger the capacity of the storage tank 19, the greater the effect.

FIG. 7 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 4 are denoted by the same reference numerals as those in FIG. This example is a type in which the storage tank 19 is installed separately from the vertical fence 10 in place of forming the storage tank 19 with the vertical fence 10 and the storage tank 19 having a double cylindrical structure. The example of FIG. 7 is particularly suitable for attachment to an existing downspout 10.

A cylindrical storage tank 19 extending in the vertical direction is disposed beside the vertical rod 10. The storage tank is hermetically sealed at the upper and lower ends, and a pipe joint 12 is provided in the vertical rod 10 near the upper end. The excess water transfer pipe 15 connected to the pipe joint 12 allows the inside of the vertical rod 10 to be connected to the storage tank 19. Communicate. A flow restrictor 24 is disposed in the vertical shaft 10 on the downstream side of the pipe joint 12. Rainwater whose flow rate is restricted by the flow restrictor 24 flows into the storage tank 24 through the excess water transfer pipe 15.

At least a part of the upper part of the storage tank 19 is cut out to provide an excess water discharge port 20b (escape port). As in the example of FIG. 7, a part of the upper part of the peripheral wall of the storage tank 19 may be cut out to form a lateral excess water discharge port 20 b (escape port), or at least a part of the upper end of the storage tank 19 may be opened. The excess water discharge port (escape port) may be upward, or the excess water discharge port 20b may be covered with a lid (not shown) that can be automatically opened and closed according to the water pressure, or may be configured without the lid. You can also.

A return pipe 50 connected to the vertical rod 10 is provided below the storage tank 19, and the return pipe 50 communicates the inside of the vertical rod 10 with the inside of the storage tank 19 on the downstream side of the flow restrictor 24. Is done. The opening of the return pipe 50 is an element corresponding to the return hole 99 in FIG. 4, and after a single heavy rain has settled, rainwater in the storage tank 19 is slowly and gradually added to the downpipe 10 downstream of the flow restrictor 24. This is the total outlet for returning. By appropriately setting the area of the opening of the return pipe 50, the return time of rainwater from the return pipe 50 to the downpile 10 can be adjusted.

In the downpipe 10, rainwater whose flow rate is limited downstream by the flow restrictor 24 flows into the storage tank 19 through the excess water transfer pipe 15 and is stored in order from the bottom. Rainwater exceeding the capacity of the storage tank 19 flows out from the excess water outlet 20b. When a single heavy rain becomes light rain and the entire amount of rainwater in the downpipe 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19, and rainwater in the storage tank 19 is stored in the storage tank 19. It naturally flows out to the downpipe 10 through the return pipe 50 at the lower part. Then, when the next heavy rain comes again, the water storage function of the storage tank 19 is exhibited again.

The excess water transfer pipe 15 and the excess water discharge port 20b need to be large enough to allow the rainwater whose flow rate is restricted by the flow restrictor 24 to flow into or out of the storage tank 19 without staying in the downpipe 10. Of course.

FIG. 8 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. In the example of FIG. 8, the lower portion of the storage tank 19 is communicated with the vertical shaft 10 downstream of the flow restrictor 24 by the return pipe 50, and the lower portion of the storage tank 19 is communicated by the return pipe 50. This is a mode of communicating with the downpile 10 upstream of the flow restrictor 24. That is, the flow restrictor 24 is located downstream of the return pipe 50. In this case, the return pipe 50 may have an opening area similar to that of the excess water transfer pipe 15 or may have a very small opening area as in the example of FIG. FIG. 8 shows an example in which the opening area is about the same as that of the excess water transfer pipe 15.

When the opening area of the return pipe 50 is made the same as that of the excess water transfer pipe 15, excess water whose flow rate is restricted by the flow restrictor 24 rises in the storage tank 19 through the return pipe 50 and is stored. When the tank 19 is full, the water is naturally discharged from the excess water discharge port 20b. Further excess water is discharged from the excess water outlet 20 b through the excess water transfer pipe 15. When the heavy rain is settled, the rainwater stored in the storage tank 19 is discharged to the downstream side through the return pipe 50 and the flow restrictor 24. Since the flow rate at the time of discharge is regulated to a predetermined value by the flow restrictor 24 serving as a full discharge port, there is no problem even if the opening area of the return pipe 50 is larger than the opening area of the flow restrictor 24.

On the other hand, when the opening area of the return pipe 50 is very small as in FIG. 7, excess water whose flow rate is restricted by the flow restrictor 24 mainly flows into the storage tank 19 through the excess water transfer pipe 15. . When the storage tank 19 becomes full, rainwater in the storage tank 19 is naturally discharged to the outside from the excess water discharge port 20b. When the heavy rain is settled, the rainwater stored in the storage tank 19 is discharged to the downstream side through the return pipe 50 and the flow restrictor 24. The flow rate at the time of discharge is regulated by the area of the opening of the return pipe 50 serving as a total discharge port.

FIG. 9 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 8 are denoted by the same reference numerals as those in FIG. FIG. 9 is a mode in which the return pipe 50 also serves as the excess water transfer pipe 15. The return pipe 50 has the same thickness (open area) as the excess water transfer pipe 15 in FIG. 8. In this configuration, it passes through 50 and moves up or down in the storage tank 19. In the example of FIG. 9, since the return pipe 50 also serves as the excess water transfer pipe 15, the pipe joint 12 and the excess water transfer pipe 15 in FIG. 8 are unnecessary. Therefore, the example of FIG. 9 has a simpler configuration than the example of FIG. In the example of FIG. 9, the rainwater passage hole 24 a of the flow restrictor 24 serves as a total discharge outlet.

Since the examples of FIGS. 7 to 9 also have a water storage function, they are particularly suitable when applied to the veranda of a high-rise house.

FIG. 10 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. In this example, at least a part of the upper end of the storage tank 19 is opened to form an upper end open portion , and the upper end open portion is used as an excess water discharge port 20. The excess water discharge port 20 that is the upper end opening portion may be provided with a net-like dust-removable dust remover. In FIG. 10, all of the upper end of the storage tank 19 is opened as the excess water discharge port 20. However, the present invention is not limited to this, and a part of the upper end of the storage tank 19 is opened as the excess water discharge port 20. You can also.

A flow restrictor 24 is disposed in the vertical shaft 10, and the excess water transfer pipe 15 extends from the pipe joint 12 disposed upstream of the flow restrictor 24. Outer end 15a of the excess water transfer pipe 15, and is open from above the upper end opening of the storage tank 19 toward the interior of the savings distillation tank 19.

A return pipe 50 connected to the vertical rod 10 is provided below the storage tank 19, and the return pipe 50 communicates the inside of the vertical rod 10 with the inside of the storage tank 19 on the downstream side of the flow restrictor 24. Is done. The return pipe 50 is the same as that of FIG.

Further, in the example of FIG. 10, a water discharge hole 88 for discharging rainwater to the outside is disposed at the lower part of the storage tank 19. The water discharge hole 88 may be a normally open type or an opening / closing type such as a water tap. In this case, the return pipe 50 is not necessary.

In the downpipe 10, rainwater whose flow rate is limited downstream by the flow restrictor 24 flows into the storage tank 19 through the excess water transfer pipe 15 and is stored in order from the bottom. Rainwater exceeding the capacity of the storage tank 19 flows out from the excess water outlet 20. When a single heavy rain becomes light rain and the entire amount of rainwater in the downpipe 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19, and rainwater in the storage tank 19 is stored in the storage tank 19. It naturally flows out to the downpipe 10 through the return pipe 50 at the lower part. Then, when the next heavy rain comes again, the water storage function of the storage tank 19 is exhibited again.

In the example of FIG. 10, in a detached house in an urban area, excessive rainwater in the rain gutter is sprayed and infiltrated on the site of the house so that heavy rain does not fill the sewage gutter 2 and / or rain gutter 2a. In this mode, a large amount of rainwater is temporarily stored in the storage tank 19. Thereby, it can prevent that the sewer of a city becomes full.

FIG. 10 illustrates a mode in which rainwater in the vertical gutter 10 flows into the rainwater tank 2a dedicated to rainwater, and rainwater is discharged from the rainwater tank 2a through the sewage drain pipe 5 to the sewer 55. However, it is needless to say that rainwater can be introduced into the sewage tank 2 shown in FIG. 1 instead of the rainwater tank 2a.

FIG. 11 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. In this example, in FIG. 7, the return pipe 50 is abolished, a part of the lower part of the storage tank 19 is notched to form a water discharge hole 51, and this water discharge hole 51 is used as a whole discharge port. Rainwater in the storage tank 19 naturally flows out through the water discharge hole 51 to the outside. Depending on the size of the water discharge hole 51, the total drainage time of rainwater in the storage tank 19 is determined.

In the above embodiment, the following modifications or specific examples can also be adopted.

(1) A mode in which the rainwater passage rate by the flow restrictor 24 can be adjusted from the outside of the downpipe 10. The rainwater passage rate may be adjusted step by step, but it is preferable that the rainwater passage rate can be continuously or continuously as shown in the example of FIG.

As shown in FIG. 12, at least two flow restrictors 24 having a latching arm 42 are prepared. Both have the same configuration, and have a rain water passage hole 44 in a disc-shaped flow restricting surface 43. The rainwater passage hole 44 is a circular or semicircular hole, and is disposed close to one side of the flow restrictor 43 with an area half or less than the circular restrictor 43 as viewed from above.

The flow restrictors 43 and 43 of the two flow restrictors 24 and 24 are overlapped as shown by an arrow A in FIG. 12 and suspended in the vertical shaft 10 by the latching arms 42 and 42. In this superposed suspension state, as shown by an arrow B in FIG. 12, one flow restrictor 24 is rotated around the central axis X of the flow restrictor surface 43 to change the superposition angle position with respect to the other flow restrictor 24. Then, the overlapping state of the rainwater passage holes 44 and 44 brought close to one side of the flow restricting surface 43 of the two flow restrictors 24 and 24 continuously changes. Thereby, the opening area of the small hole 44a overlapped by the rainwater passage holes 44, 44 defined by the two flow restrictors 24, 24 is continuously changed, and the rainwater passage rate is adjusted steplessly. According to the example of FIG. 12, adjustment of the rainwater passage rate can be achieved with a simple configuration, which is preferable. The adjustment range of the rainwater passage rate of the flow restrictor 24 can be, for example, about 5% to 40%.

Note that the rotation operation of the flow restrictor 24 uses a portion of the latching arm 42 exposed to the outside of the vertical rod 10 when at least a part of the latching arm 42 is exposed to the outside. Can be done. As another example, when at least a part of the latching arm 42 is not exposed to the outside, the adjustment lever (operation member) 26 exposed to the outside is latched so that the flow restrictor 24 can be rotated from the outside. It is preferable to provide the arm 42. For example, as shown in FIG. 5, a lateral slit 26a may be provided around the storage tank 19, and the adjustment lever 26 connected to the latching arm 42 may be extended outward from the slit 26a.

(2) For example, a flow restrictor 24 having a rainwater passage rate different from 20%, 40%, and 60% is prepared, and can be selected according to the capacity and drainage capacity of the sewage tank 2 and / or the rainwater tank 2a. It is good to do so.

(3) In a house with a site, a part of the storage tank 19 in FIGS. 2 to 10 , preferably the most part (90% or more) can be buried in the ground to make it invisible. In this case, in particular, the shape of the storage tank 19 can be freely set. For example, the buried portion can be shallowed by increasing the width.

(4) The capacity of the storage tank 19 and the natural drainage flow rate from the total discharge outlet are set so that the filled storage tank 19 becomes substantially empty after about 15 to 45 minutes, preferably about 30 minutes. You can also.

(5) FIG. 14 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 3 are denoted by the same reference numerals as those in FIG. In this example, the excess water discharge port 20 b of FIG. 3 is formed in the rainwater pipe 4 on the upstream side of the storage tank 19. An air vent 20c is preferably formed in the lid 20a that closes the upper end of the storage tank 19 in a liquid-tight manner so that rainwater can smoothly flow into the storage tank 19.

The configuration shown in FIG. 14 can be applied to the examples shown in FIGS. That is, in the example of FIGS. 4 to 6, the upper portion of the storage tank 19 is liquid-tightly closed with the lid 20 a as in FIG. 3, and the excess water discharge port 20 b is connected to the rainwater pipe 4 on the upstream side of the storage tank 19 as in FIG. Form. In this case as well, an air vent 20c is preferably formed in the lid 20a that closes the upper end of the storage tank 19 in a liquid-tight manner.

(6) FIG. 15 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. In this example, the excess water discharge port 20 b in FIG. 7 is formed in communication with the rainwater pipe 4 on the upstream side of the storage tank 19. In the upper part of the storage tank 19, an air vent 20 c is formed in order to allow smooth inflow of rainwater into the storage tank 19.

In the example of FIG. 15, the excess water discharge port 20 b is formed in the downpipe 10 on the upstream side of the pipe joint 12 that is a connection part between the excess water transfer pipe 15 and the downpipe 10. A side opening 28 of the vertical shaft 10 is provided, and an L-shaped discharge port forming tube 27 is connected to the opening 28, and an upper end opening of the discharge port forming tube 27 is used as an excess water discharge port 20b.

14, similarly to FIG. 15, the L-shaped discharge port forming pipe 27 is used to form the excess water discharge port 20 b in communication with the rainwater pipe 4 on the upstream side of the storage tank 19. You can also.

(7) FIG. 16 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 8 are denoted by the same reference numerals as those in FIG. In this example, the excess water discharge port 20 b in FIG. 8 is formed in communication with the rainwater pipe 4 on the upstream side of the storage tank 19. In the upper part of the storage tank 19, an air vent 20 c is formed in order to allow smooth inflow of rainwater into the storage tank 19.

Also in the example of FIG. 16, as in FIG. 15, the excess water discharge port 20 b is formed in the downpipe 10 upstream of the pipe joint 12 that is the connection portion between the overwater transfer pipe 15 and the downpipe 10. . A side opening 28 of the vertical shaft 10 is provided, and an L-shaped discharge port forming tube 27 is connected to the opening 28, and an upper end opening of the discharge port forming tube 27 is used as an excess water discharge port 20b.

(8) FIG. 17 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 9 are denoted by the same reference numerals as those in FIG. In this example, the excess water discharge port 20 b in FIG. 9 is formed in communication with the rainwater pipe 4 on the upstream side of the storage tank 19. In the upper part of the storage tank 19, an air vent 20 c is formed in order to allow smooth inflow of rainwater into the storage tank 19.

In the example of FIG. 17, the excess water discharge port 20 b is formed in the vertical shaft 10 upstream of the connection portion between the return tube 50 that also serves as an excessive water transfer tube and the vertical shaft 10. A side opening 28 of the vertical shaft 10 is provided, and an L-shaped discharge port forming tube 27 is connected to the opening 28, and an upper end opening of the discharge port forming tube 27 is used as an excess water discharge port 20b.

(9) FIG. 18 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 11 are denoted by the same reference numerals as those in FIG. In this example, the excess water discharge port 20 b of FIG. 11 is formed in communication with the rainwater pipe 4 on the upstream side of the storage tank 19. In the upper part of the storage tank 19, an air vent 20 c is formed in order to allow smooth inflow of rainwater into the storage tank 19.

In the example of FIG. 18, an excess water discharge port 20 b is formed in the downpipe 10 upstream of the pipe joint 12 that serves as a connection between the excess water transfer pipe 15 and the downpipe 10. A side opening 28 of the vertical shaft 10 is provided, and an L-shaped discharge port forming tube 27 is connected to the opening 28, and an upper end opening of the discharge port forming tube 27 is used as an excess water discharge port 20b.

(10) FIG. 19 is a modified example of FIG. 15. Therefore, the same parts as the example of FIG. 15 and the description thereof is omitted here denoted by the same reference numerals as in FIG. 15. This example is characterized in that excess water discharged from the excess water discharge port 20b of FIG. 15 is returned into the rainwater pipe 4 on the downstream side of the flow restrictor 24.

Specifically, as shown in FIG. 19, the excess water discharge port 20 b communicating with the downpipe 10 is communicated with the inside of the downpipe 10 (rainwater pipe 4) on the downstream side of the flow restrictor 24 by the bypass pipe 29 . . This embodiment is significant when excess water cannot be released to the site or veranda. According to this embodiment, excess water is guided into the rainwater pipe 4 through the bypass pipe 29 and downstream of the flow restrictor 24. Therefore, excess water does not flow out to the site or veranda.

(11) FIG. 20 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. This example is characterized in that excess water discharged from the excess water discharge port 20b of FIG. 7 is returned into the rainwater pipe 4 on the downstream side of the flow restrictor 24.

Specifically, as shown in FIG. 20, the excess water discharge port 20 b provided in the upper part of the storage tank 19 communicates with the inside of the downpipe 10 (rainwater pipe 4) on the downstream side of the flow restrictor 24 by the bypass pipe 29 . Be made. This embodiment is significant when excess water cannot be discharged to the site or veranda. According to this embodiment, excess water is guided into the rainwater pipe 4 through the bypass pipe 29 and downstream of the flow restrictor 24. Therefore, excess water does not flow out to the site or veranda.

The example of FIGS. 19 and 20 is a mode in which a bypass pipe 29 is added to the embodiment of FIGS . 15 and 7 respectively. However, also in the other embodiments, by adding the bypass pipe 29 , the excess water flowing out from the excess water discharge port 20b can be led into the rainwater pipe 4 on the downstream side of the flow restrictor 24. Thereby, it can prevent that excess water flows out into a site or a veranda.

(12) FIG. 21 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 4 are denoted by the same reference numerals as those in FIG. In this example, the rainwater pipe 4 is cut out on the downstream side of the flow restrictor 24 and the upstream side of the return hole 99 to form an excess water discharge port 20d, and excess water enters the rainwater pipe 4 from the excess water discharge port 20d. It is returned. That is, the example of FIG. 21 eliminates the excess water discharge port 20b provided in the upper part of the storage tank 19 in the example of FIG. 4, and discharges excess water to the rainwater pipe 4 on the downstream side of the flow restrictor 24 and the upstream side of the return hole 99. The outlet 20d is notched.

According to the embodiment of FIG. 21, excess rainwater overflowing from the opening 40 by the action of the flow restrictor 24 flows into the storage tank 19 and is stored in order from the bottom. The allowable maximum amount of water stored in the storage tank 19 is determined by the height position of the excess water discharge port 20 d on the rainwater pipe 4. Rainwater exceeding the maximum allowable amount of water stored in the storage tank 19 flows out from the excess water outlet 20d into the rainwater pipe. When one heavy rain becomes light rain and the entire amount of rainwater in the downpile 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 from the opening 40. Thereafter, rainwater in the storage tank 19 flows out from the return hole 99 at the bottom of the storage tank 19 to the downpipe 10. And when the next heavy rain comes again, the water storage function of the storage tank 19 will be exhibited again.

21, the lid 21 may be configured to be openable and closable as in FIG. 4, or the lid 20a may be configured to liquid-tightly close the upper end opening of the storage tank 19 as illustrated in FIG. . In the latter case, an air vent 20 c may be formed in the upper part of the peripheral wall of the lid 21 or the storage tank 19.

(13) FIG. 22 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 21 are denoted by the same reference numerals as those in FIG. In this example, the flow restrictor 24 and the return hole 99 in FIG. 21 can be adjusted in flow rate. Although the specific example for making it possible to adjust the rainwater passage rate by the flow restrictor 24 from the outside has already been described with reference to FIG. 12, the example of FIG. 22 shows another example.

In FIG. 22, the flow restrictor 24 is a plate-like member whose position can be adjusted in a direction intersecting the rainwater pipe 4. The flow restrictor 24 is supported so that its position can be adjusted with respect to the rainwater pipe 4. The operation portion 24 d of the flow restrictor 24 extends to the outside of the storage tank 19 so that it can be operated from the outside of the storage tank 19. The flow restrictor 24 is provided with a circular rainwater passage hole 24a, and a portion located around the rainwater passage hole 24a and located inside the rainwater pipe 4 is a flow restrictor surface 24b. In the example of FIG. 22, the rainwater passage rate of the rainwater passage hole 24a is 40% at the maximum, and the rainwater passage rate by each gap between the inner peripheral surface of the rainwater pipe 4 and the side edge of the flow restrictor is 5% (due to two gaps). The total rainwater passage rate is 10%). For this reason, the maximum rainwater passage rate as a whole of the flow restrictor 24 is 50% (40% + 10%). Then, by adjusting the position of the flow restrictor 24 in the direction of the arrow in FIG. 22, the rainwater passage rate by the rainwater passage hole 24a can be adjusted from 40% to 0%. As a result, the rainwater passage rate of the entire flow restrictor 24 can be adjusted between 50% and 10%.

In FIG. 22, the return hole 99 is a circular hole, and the conical plug 99 a inserted into the return hole 99 is movable forward and backward with respect to the return hole 99. The conical stopper 99a is fixed to a rotary screw rod 99b, and this rotary screw rod 99b is supported in a screwed state with respect to the rainwater pipe 4 or the storage tank 19. The operating portion 99c of the rotating screw rod 99b is exposed to the outside of the storage tank 19 so that it can be rotated from the outside of the storage tank 19.

In the above configuration, when the rotary screw rod 99b is rotated, the conical stopper 99a moves forward and backward with respect to the return hole 99. As a result, the flow rate of the return hole 99 is adjusted by the conical stopper 99.

The flow rate adjustment of the return hole 99 can be performed also in the examples of FIGS. 4 and 21 by adopting the same configuration as that of FIG. Also in the example of FIG. 7, the flow rate of the return pipe 50 corresponding to the return hole 99 can be adjusted by providing a metering valve operable from the outside on the return pipe 50.

(14) FIGS. 23 to 25 are modifications of FIG. Therefore, the same parts as those in the example of FIG. 22 are denoted by the same reference numerals as those in FIG. The example of FIGS. 23-25 makes the storage tank 19 in FIG. 22 expandable / contractible. 23 to 25, the storage tank 19 is in a contracted state when it is not raining, and the storage tank 19 naturally expands due to a large amount of rain, and is stored as rainwater in the storage tank 19 is discharged. The tank 19 naturally returns to the contracted state.

(15) In the example of FIG. 23, the storage tank 19 is formed of a waterproof cloth or sheet, and the storage tank 19 can be expanded and contracted as a whole by the flexibility of the cloth or sheet. It is sufficient that the storage tank 19 is made of at least a part of a waterproof cloth or sheet. However, if the entire storage tank 19 is made of a waterproof cloth or sheet, the reduced state can be further reduced, and a large-capacity storage tank 19 can be obtained.

In FIG. 23, the storage tank 19 includes a vertical cylindrical peripheral surface portion 60, and a lower surface portion 63 that liquid-tightly connects the lower end portion 62 of the peripheral surface portion 60 and the rainwater pipe 4. The upper surface portion of the storage tank 19 may be opened or closed. Both the peripheral surface portion 60 and the lower surface portion 63 are formed of a waterproof cloth or sheet. Each of the upper end portion 61 and the lower surface portion 63 of the peripheral surface portion 60 is supported by umbrella-shaped support bones 64 extending radially from the outer peripheral surface of the rainwater pipe 4. In the illustrated example, four support bones 64 are arranged around the rainwater pipe 4 at intervals of 90 degrees, but may be larger than this. These supporting bones 64 are pivotally supported with respect to the rainwater pipe 4 so as to be opened and closed like an umbrella bone upside down, and are closed along the rainwater pipe 4 by a tension coil spring 65 as an urging means. It is always energized to become. When the supporting bone 64 is closed so as to face upward along the rainwater pipe 4 by the action of the tension coil spring 65, the peripheral surface portion 60 of the storage tank 19 gathers around the rainwater pipe 4. This state is a reduced state of the storage tank 19. That is, the storage tank 19 is always urged by the tension coil spring 65 so as to be in a contracted state.

According to the example of FIG. 23, excess rainwater overflowing from the opening 40 by the action of the flow restrictor 24 flows into the storage tank 19 and is stored in order from the bottom. The rainwater inflow into the storage tank 19 overcomes the urging force of the tension coil spring 65 and opens the lower surface portion 63 of the storage tank 19 downward. Thereby, the whole storage tank 19 is gradually shifted to the expanded state. That is, the tension coil spring 65 allows expansion of the storage tank 19 due to the inflow of rainwater into the storage tank 19.

When one heavy rain becomes light rain and the entire amount of rainwater in the downpile 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 from the opening 40. Thereafter, rainwater in the storage tank 19 flows out from the return hole 99 at the bottom of the storage tank 19 to the downpipe 10. As rainwater in the storage tank 19 decreases, the upper surface portion 62 and the lower surface portion 63 begin to close upward by the action of the tension coil spring 65. When the inside of the storage tank 19 becomes substantially empty, the storage tank 19 returns to the original reduced state.

In FIG. 23, reference numeral 66 denotes a waterproof openable / closable part provided in a part of the cloth or sheet storage tank 19. The openable / closable portion 66 is configured to be openable and closable by, for example, a fastener type. The openable / closable portions 66 are disposed in the vicinity of the flow restrictor 24 and the conical plug 99a. The flow rate adjusting operation of the flow restrictor 24 and the conical plug 99a can be performed by opening the openable / closable portion 66 as necessary.

(16) In the example of FIG. 24 as well, as in the example of FIG. 23, the storage tank 19 is formed of a waterproof cloth or sheet, and the storage tank 19 is made expandable and contractable as a whole by the flexibility of the cloth or sheet. Yes. It is sufficient that the storage tank 19 is made of at least a part of a waterproof cloth or sheet. However, if the entire storage tank 19 is made of a waterproof cloth or sheet, the reduced state can be reduced, and a large-capacity storage tank can be obtained.

In FIG. 24, the storage tank 19 includes a vertical cylindrical peripheral surface portion 60, and a lower surface portion 63 that liquid-tightly connects the lower end portion 62 of the peripheral surface portion 60 and the rainwater pipe 4. The upper surface part may be opened or closed. The peripheral surface portion 60 may have a vertical rectangular tube shape. Both the peripheral surface portion 60 and the lower surface portion 63 are formed of a waterproof cloth or sheet. A vertical bone 67 as a weight member is fixed to the outer surface of the peripheral surface portion 60. In the illustrated example, four longitudinal bones 67 are arranged around the peripheral surface portion 60 at intervals of 90 degrees, but may be larger than this. The upper ends of the vertical bones 67 are connected to the rainwater pipe 4 by ropes 68.

The vertical bone 67 as a weight member hangs down so as to be close to the rainwater pipe 4 at all times due to its own weight, and the storage tank 19 is arranged so that the peripheral surface portion 60 of the storage tank 19 made of cloth or sheet gathers around the rainwater pipe 4. It is for reducing. Therefore, the vertical bone 67 needs to have sufficient weight to reduce the cloth or sheet storage tank 19. For this reason, as the vertical bone 67, it is preferable to use metal bars, such as a steel bar.

According to the example of FIG. 24, excess rainwater overflowing from the opening 40 by the action of the flow restrictor 24 flows down into the storage tank 19 and is stored in order from the bottom. The storage tank 19 made of cloth or sheet swells due to the inflow of rainwater into the storage tank 19, the vertical bone 67 moves away from the rainwater pipe 4, and the entire storage tank 19 shifts to the expanded state.

When one heavy rain becomes light rain and the entire amount of rainwater in the downpile 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 from the opening 40. Thereafter, rainwater in the storage tank 19 flows out from the return hole 99 at the bottom of the storage tank 19 to the downpipe 10. As the rainwater in the storage tank 19 decreases, the peripheral surface 60 of the storage tank 19 gathers around the rainwater pipe 4 with the weight of the vertical bone 67. When the inside of the storage tank 19 becomes substantially empty, the storage tank 19 returns to the original reduced state.

(17) In the example of FIG. 25, the storage tank 19 is formed of a waterproof stretchable sheet, and the storage tank 19 can be expanded and contracted as a whole by the stretchability of the sheet. The storage tank 19 is sufficient if it is at least partially made of a waterproof stretchable sheet. However, if the entire storage tank 19 is formed of a waterproof stretchable sheet, the reduced state can be further reduced, and a large-capacity storage tank can be obtained.

In FIG. 25, the storage tank 19 is a cylindrical body having an upper end 69 and a lower end 70 opened, and the upper end 69 and the lower end 70 are liquid-tightly fixed to the rainwater pipe 4 in a state of being attached to the rainwater pipe 4. Is done. The storage tank 19 is contracted so as to be close to the outer peripheral surface of the storage tank 19 in a state where rainwater is not accumulated. When rainwater begins to accumulate in the storage tank 19, the seat extends and the storage tank 19 expands. An expansion regulating band 71 is disposed around the storage tank 19 to restrict expansion of the storage tank 19 beyond a predetermined level. The maximum allowable water storage amount of the storage tank 19 is defined by the expansion restriction band 71. The expansion restriction bands 71 are preferably disposed at a plurality of locations in the vertical direction of the storage tank 19. A part of each expansion regulating band 71 may be fixed to the outer surface of the storage tank 19.

When one heavy rain becomes light rain and the entire amount of rainwater in the downpile 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 from the opening 40. Thereafter, rainwater in the storage tank 19 flows out from the return hole 99 at the bottom of the storage tank 19 to the downpipe 10. As the rainwater in the storage tank 19 decreases, the storage tank 19 contracts around the rainwater pipe 4. When the inside of the storage tank 19 becomes substantially empty, the storage tank 19 returns to the original reduced state.

24 and 25, as in FIG. 23, a waterproof openable / closable portion 66 is provided in order to enable the flow rate adjustment operation of the flow restrictor 24 and the conical plug 99a.

(18) FIG. 26 is a modification of FIG. Therefore, the same parts as those in the example of FIG. 7 are denoted by the same reference numerals as those in FIG. In the example of FIG. 26, the storage tank 19 in FIG. According to the example of FIG. 26, the storage tank 19 is in a contracted state when it is not raining, and the storage tank 19 naturally expands due to a large amount of rain, and the storage tank 19 is discharged as rainwater in the storage tank 19 is discharged. Naturally returns to the reduced state.

In FIG. 26, at least a part of the storage tank 19 is made of a waterproof cloth or sheet. The storage tank 19 can be expanded and contracted by the flexibility of the cloth or sheet. As an example, the storage tank 19 includes a fixed portion 72 having a constant shape, and an expansion / contraction portion 73 that expands by rainwater inflow and contracts by rainwater outflow. The fixed portion 72 is formed of metal or plastic, and the expansion / contraction portion 73 is formed of a waterproof cloth. The excess water transfer pipe 15 and the return pipe 50 are connected to the shaped part 72, and the excess water discharge port 20 b is also arranged in the shaped part 72.

The expansion / contraction part 73 is arranged continuously to the fixed part 72, and the inside of the fixed part 72 communicates with the inside of the expansion / contraction part 73. A foldable telescopic arm 74 is disposed above and below the expansion / contraction part 73. The telescopic arm 74 supports the cloth or sheet constituting the expansion / contraction part 73 from the inside. The base end portion 74a of the extendable arm 74 is connected to the fixed portion 72, and the bellows-like expand / contract portion 73 is connected to the distal end portion 74b of the extendable arm 74 in a contracted state. The extension arm 74 is provided with a tension coil spring 75 as an example of an urging means. The tension coil spring 75 constantly urges the expansion / contraction part 73 toward the contracted state and allows the expansion / contraction part 73 to be expanded by the inflow of rainwater into the storage tank 19. In the illustrated example, the tension coil spring 75 is installed between the frame 76 disposed in the storage tank 19 and the telescopic arm 74, and constantly urges the telescopic arm 74 toward the contracted state (folded state). Yes. When the telescopic arm 74 is in the contracted state, the expansion / contraction part 73 is in the contracted state. Then, the inflow of rainwater into the storage tank 19 overcomes the urging force of the tension coil spring 75 and the expansion / contraction part 73 expands, and at the same time, the telescopic arm 74 extends.

When one heavy rain becomes light rain and the entire amount of rainwater in the downpipe 10 can pass through the flow restrictor 24, rainwater does not flow into the storage tank 19 from the pipe joint 12. Thereafter, the rainwater in the storage tank 19 flows out from the return pipe 50 below the storage tank 19 to the downpipe 10. As rainwater in the storage tank 19 decreases, the telescopic arm 74 contracts due to the action of the tension coil spring 75, and the expansion / contraction part 73 of the storage tank 19 returns to the original contracted state.

In the above description, the expansion / contraction structure of the storage tank 19 has been described based on the examples of FIGS. 21 and 7, but the present invention is not limited to this, and the expansion / contraction structure of the storage tank 19 of FIGS. 22 to 26 is illustrated. Of course, other examples can be applied with appropriate modifications.

According to the survey, just building the underground storage pipe 56 (see Fig. 10) necessary for heavy rain measures in a part of the city will cost several billion to over 10 billion yen. For example:

Survey result A: The burial cost of a storage pipe with a diameter of 4.25 m, a length of 1.9 km, and 24,000 m ³ : 6.9 billion yen

Survey result B: Burial cost for storage pipe with diameter of 5.50 m, length of 6.5 km, and 86,000 m ³ : 19.9 billion yen

On the other hand, if the rainwater control device of the present invention is adopted, it is expected that the same effect can be achieved with a tenth of a trial calculation.

Assuming that a private house with a residential site can hold 4 stormwater control devices per household and retain 800 liters (4 drums) of excess stormwater, a rainwater control device with a unit price of about 5000 yen. If it is adopted by 30,000 to 100,000 households, the same effect as a large storage pipe can be achieved at 5000 yen x 4 pieces x 3 to 100,000 households, that is, 6 to 2 billion yen.

It is the torrential rain that actually needs to be countered. Here, the torrential rain refers to a localized, short-time (for example, 10 minutes) heavy rain, that is, a large amount of short-time rain continuously falling over a limited area. During heavy rain, the drainage function of the sewer may exceed the limit. The rainwater control apparatus according to the present invention can discharge excessive rainwater from a gutter from an excessive water discharge port and / or store it in a storage tank in the case of a heavy rain that falls suddenly in such a short time.

By the way, according to the 2009 report of the Japan Meteorological Agency, it is as follows.

<Guide for using disaster prevention weather information>
Quotation: Characteristics of rain in localized heavy rain and heavy rain

The heavy rain that falls in a short period of time can occur in both localized heavy rains and torrential rains. There is a difference that it is transient in localized heavy rain and repeated in heavy rain. As a result, torrential rains have a longer duration and more total rainfall than localized heavy rains. In the case of torrential rain (Juo 28, 2008, Kanazawa City), rain of 10 mm or more per 10 minutes (very heavy rain that becomes 60 mm or more if continued for 1 hour) is repeated 3-4 After a long time, the total rainfall was 142mm. In the example of localized heavy rain (Mita City, July 28, 2008), about 10 mm of rain fell every 10 minutes, and the total rainfall was 63 mm. "

Based on this calculation, if the house is 60 tsubo, it will rain 1 cm (10 mm) × 196,000 square centimeters = 1980000 cubic centimeters in 10 minutes on an area of 60 × 3.3 square meters = 198 square meters = 1980000 square centimeters. Since 1 liter is 1000 cubic centimeters, it becomes 1980 liters (about 2000 liters) of rainfall in 60 minutes at 10 tsubo.

If about 2000 liters of rain falls on the house 60 tsubo, if half of the site is the roof of the house, half of the liter, that is, rainwater equivalent to five drums will pour onto the roof. If 40% of this heavy rainwater (equivalent to two drums) is discharged outside the downpipe and sprayed on the site or / and kept in the storage tank, the rainwater flowing into the sewer can be greatly reduced. .

In a private house with a residential site, 4 rainwater control devices were applied to one household, and it was calculated assuming that 800 liters (4 drum cans (200 liters)) of excess rainwater could be retained. Is expected to be half that. Even if rain of about 10 mm per 10 minutes continues for another 10 minutes, it can withstand almost.

In reality, the residential site is already filled to some extent with infiltrated water, so it is preferable to keep the water in the storage tank rather than flowing it to the site. As a simple means, for example, an old drum can is installed near the vertical shaft and stored in the drum can, and after rain stops, it is sprayed and thrown away on the site, or a predetermined amount of water is discharged on the wall around the bottom of the drum can. If the hole 88 (see FIG. 10) is opened and the accumulated rainwater is discharged in about 30 minutes, the next heavy rain to come again can be dealt with again. This is a function similar to that of a conventional underground storage pipe. Rainwater discharged from the water discharge hole 88 penetrates into the underground of the site or flows into the side ditch of the road and flows out into the sewer and nearby rivers.

When it is said that placing four storage tanks (for example, drums) outside a single detached house is detrimental to the appearance, the storage tank 19 of the type shown in FIGS. 2 to 6 may be employed.

For example, when a cylinder having a diameter of 30 cm is used as the storage tank 19 shown in FIGS. 2 to 11, the cross-sectional area of the cylinder is about 3.14 × 15 × 15 = 706 cm ^2. A height of about 280 cm is required for a liter capacity.

Even if the storage tanks 19 of the above-mentioned size are attached to the vertical shafts at the four corners of the house, it is presumed that the aesthetic appearance is not impaired so much. If the storage tank is too thick and you are interested in aesthetics, you can store a capacity of 88 liters by using a cylinder with a diameter of 20 cm. Although it is not enough, it is considered to be a measure against heavy rain.

When installing a cylindrical storage tank 19 on the veranda of each floor of a high-rise house, assuming that there are 20 households on each floor as a single storage tank per household, each household stores 200 liters. This would be 80000 liters in 400 households, equivalent to the capacity of 400 drums.

When embedded cost of reserve tube of 24,000M ³ is compared with the data of 6.9 billion, 1 households assuming possible water retention four pieces of excess rainwater barrels, 30,000 households should be adopted to cooperate Therefore, the amount is equivalent to 120,000 drums. If the above-mentioned high-rise housing bears the same function as a 24,000 m ³ storage pipe, 300 buildings need to be cooperated. In cities, the number of private houses on the site is limited, and cooperation with high-rise houses seems essential. It is hoped that local governments, including local residents, will work together to create a better place to live in.

DESCRIPTION OF SYMBOLS 1 House 2 Sewage basin 2a Rainwater basin 4 Rainwater basin ... {Ground pipe 7 (eave ridge 9 + longitudinal ridge 10) + buried pipe 8}
6 Sewage sources (toilet, etc.)
20, 20b Excess water outlet 21 Lid 18 Inward flange 19 Storage tank 24 Flow restrictor 26 Adjusting lever (operating member)
40 opening 43 flow restricting surface 44 rain water passage hole 50 return pipe 55 sewer 56 storage pipe 64, 74 urging means (tensile coil spring)
99 Return hole

Claims (14)

An excess water discharge port for discharging rainwater exceeding the allowable maximum storage amount of the storage tank, comprising: a flow restrictor for restricting a flow rate of rainwater in a rainwater pipe of a house; and a storage tank for receiving rainwater restricted by the flow restrictor. together but is formed to communicate with the reservoir tank, the total amount outlet rainwater in the storage tank is discharged is naturally a configuration that is formed to communicate with the storage tank, to a limited area In the case of concentrated torrential rain where a large amount of short-term rain falls continuously, rainwater is stored in the storage tank during one torrential rain, and after the one torrential rain has settled, the next torrential rain The storage tank capacity and the size of the total discharge outlet are set so that the storage tank that has become full until the time of the tank is substantially empty in about 15 to 45 minutes. apparatus. The rainwater control device according to claim 1, wherein the rainwater pipe is divided into upper and lower parts, and the storage tank is disposed around the rainwater pipe so as to wrap the lower end of the upper pipe and the upper end of the lower pipe, The tank has a cylindrical shape extending in the vertical direction, and has an inward flange at the lower end. The inward flange is liquid-tightly connected to the outer peripheral surface of the lower pipe, and the upper pipe and the lower pipe A rainwater control in which a gap between the side pipe communicates with the inside of the storage tank, the flow restrictor is provided inside the lower pipe, and a rainwater passage hole of the flow restrictor serves as the total discharge port apparatus. The rainwater control device according to claim 1, wherein an opening is formed by cutting out a part of the rainwater pipe, the storage tank is disposed around the rainwater pipe so as to wrap around the opening, It has a cylindrical shape extending in the vertical direction, and has an inward flange at the lower end. The inward flange is liquid-tightly connected to the outer peripheral surface of the rainwater pipe, and the opening communicates with the interior of the storage tank. And a rainwater control device in which the flow restrictor is provided inside a rainwater pipe on the downstream side of the opening, and the rainwater passage hole of the flow restrictor serves as the exhaust port. The rainwater control device according to claim 1, wherein an opening is formed by cutting out a part of the rainwater pipe, the storage tank is disposed around the rainwater pipe so as to wrap around the opening, It has a cylindrical shape extending in the vertical direction, and has an inward flange at the lower end. The inward flange is liquid-tightly connected to the outer peripheral surface of the rainwater pipe, and the opening communicates with the interior of the storage tank. The flow restrictor is provided inside the rainwater pipe on the downstream side of the opening, and a return hole located at the lower part inside the storage tank and on the downstream side of the flow restrictor is provided in the rainwater pipe. A rainwater control apparatus provided with a cutout portion, wherein the return hole serves as the total discharge port. The rainwater control apparatus according to any one of claims 2 to 4, wherein the storage tank is formed by liquid-tight coupling of divided parts that can be combined so as to surround the rainwater pipe. The rainwater control apparatus according to any one of claims 2 to 5, wherein the storage tank is cylindrical and is installed eccentrically with respect to the rainwater pipe. The rainwater control device according to claim 1, wherein the storage tank has a cylindrical shape extending in a vertical direction, the storage tank is provided separately from the rainwater pipe, and rainwater in the rainwater pipe is supplied to the storage tank. An excess water transfer pipe to be introduced is disposed, the flow restrictor is disposed on the downstream side of the rainwater pipe from a connection portion between the excess water transfer pipe and the rainwater pipe, and a lower part of the storage tank is connected to the flow rate by a return pipe. A rainwater control device that communicates with the rainwater pipe at a downstream side of the throttle, and that an opening of the return pipe serves as the total discharge port. The rainwater control device according to claim 1, wherein the storage tank has a cylindrical shape extending in a vertical direction, the storage tank is provided separately from the rainwater pipe, and rainwater in the rainwater pipe is supplied to the storage tank. An excess water transfer pipe to be introduced is disposed, the flow restrictor is disposed on the downstream side of the rainwater pipe from a connection portion between the excess water transfer pipe and the rainwater pipe, and a lower part of the storage tank is connected to the flow rate by a return pipe. A rainwater control apparatus that communicates with the rainwater pipe upstream of the throttle, and that the opening of the return pipe or the rainwater passage hole of the flow restrictor serves as the total discharge outlet. The rainwater control apparatus according to claim 8, wherein the return pipe also serves as the excess water transfer pipe, and a rainwater passage hole of the flow restrictor serves as the total discharge port. The rainwater control device according to claim 1, wherein the storage tank has a cylindrical shape extending in a vertical direction, the storage tank is provided separately from the rainwater pipe, and rainwater in the rainwater pipe is supplied to the storage tank. An excess water transfer pipe to be introduced is disposed, the flow restrictor is disposed on the downstream side of the rainwater pipe from a connection portion between the excess water transfer pipe and the rainwater pipe, and a part of a lower portion of the storage tank is cut away. A rainwater control device in which the whole discharge port is formed. The rainwater control device according to any one of claims 1 to 10, wherein at least a part of the upper end of the storage tank is opened to form an upper end open portion, and the upper end open portion serves as the excess water discharge port. , Rainwater control device. The rainwater control device according to any one of claims 1 to 10, wherein an upper end of the storage tank is sealed, and a part of an upper portion of a peripheral wall of the storage tank is cut out to provide the excess water discharge port. apparatus. The rainwater control device according to claim 7 or 8, wherein at least a part of the upper end of the storage tank is opened to form an upper end open portion, the upper end open portion serves as the excess water discharge port, The rainwater control apparatus, wherein an outer end portion of the excess water transfer pipe is opened toward the upper end opening portion. The rainwater control apparatus according to any one of claims 1 to 10, wherein the excess water discharge port is formed in the rainwater pipe on the upstream side of the storage tank.

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