JP2017008714A - Rainwater controller and rainwater control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater controller that prevents excess rainwater from flowing into a sewerage system from a downpipe of a house.SOLUTION: A connection box 17 disposed to enclose a downpipe 10 has an inward-facing flange 18 at a bottom edge and at least a part of a top edge open. The inward-facing flange 18 is connected fluid-tightly to an outer peripheral surface of a lower gutter 14. An inner part of the downpipe 10 communicates with an inner part of the connection box 17, and a size of a space defined by the downpipe 10 and the connection box equals a size of a storage tank 19 for excess water. A flow amount throttle 24 is provided inside the lower gutter 14. The open top edge part of the connection box 17 serves as a drainage port 20 for excess water. Rainwater restricted by the flow amount throttle 24 is stored in the storage tank 19. The rainwater stored in the storage tank 19 flows out naturally through the flow amount throttle 24 at a time of torrential rain, during which a heavy rainfall is observed repeatedly, so that the storage tank is virtually emptied in about 15 to 60 minutes before a next heavy rainfall starts after a previous heavy rainfall subsided.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rainwater control device and a rainwater control method for controlling a flow rate of rainwater flowing from a rainwater pipe of a house toward a sewer or the like.

  As shown in FIG. 12, rainwater is introduced from a rain gutter (rainwater 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. 12 shows a state in which the inside of the vertical gutter 33 and the eaves wall 32 is full due to 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.

  Also, in the case of a shunt sewer where rainwater from the rain gutter is introduced into a rain gutter dedicated to rain water, when the rain gutter becomes full due to heavy rain and cannot be discharged to the sewer system, rainwater overflows from the eaves and flows under the eaves. Will occur. In addition, when it says a sewer, it means a sewer pipe and includes a sewage pipe and a large rainwater pipe 46A (see FIG. 21).

Furthermore, in high-rise apartments, the rainwater basin is full during heavy rains, or if the vertical culvert is thin, the culvert is full only with the rainwater on the upper floor, and rainwater accumulates on the veranda of the lower-floor residential area. 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 it is intended to prevent the sewerage system from malfunctioning even in the case of torrential rain that repeats heavy rain that falls in a short period of time. To do. In particular, it has a rainwater storage function that restricts the inflow of rainwater from the rainwater pipes of houses to sewers, etc., and the rainwater stored is naturally drained when the rainfall falls below the limit, saving space. It is intended to provide a rainwater control device and a rainwater control method that are both objective and beautiful.

  In order to solve the above problems, a rainwater control apparatus according to the present invention includes a flow restrictor for restricting a flow rate of rainwater in a rainwater pipe from the rainwater pipe to a downstream side, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor. And an excessive water discharge port for discharging excess rainwater exceeding the capacity of the storage tank to the outside is provided in the upper part of the storage tank, and repeats strong rain that collects in a short time many times In the case of a torrential rain, the storage tank was stored so that the storage tank was substantially emptied in about 15 to 60 minutes before the next heavy rain came after the first heavy rain stopped. A mode is illustrated in which a normally open full-volume discharge port from which rainwater naturally flows is formed in communication with the storage tank (claim 1).

  As a preferred embodiment, a rainwater pipe of a house is divided into two vertically and a cylindrical connection box extending in the vertical direction is provided so as to wrap the lower end of the upper pipe and the upper end of the lower pipe, and the connection box Is provided with an inward flange at the lower end and at least a part of the upper end is opened, and the inward flange is liquid-tightly connected to an outer peripheral surface of the lower pipe, and the upper pipe and the lower pipe The space defined by the inner peripheral surface of the connection box, the outer peripheral surface of the upper pipe, and the inward flange is the size of the excess water storage tank. Then, a flow restrictor is provided inside the lower pipe, the upper end opening of the connection box is an excess water discharge port, and the opening of the flow restrictor is the full discharge port (Claim 2). .

According to the present invention, the rainwater whose flow rate is limited by the flow restrictor is stored in the storage tank inside the connection box through the gap between the upper pipe and the lower pipe. When one heavy rain is settled and the amount of rainfall falls below the regulation value by the flow restrictor, the rainwater in the storage tank naturally flows downstream through the gap and the flow restrictor. When there is heavy rain enough to fill the storage tank, rainwater in the storage tank naturally overflows from the excess water outlet.

According to the present invention, the amount of rainwater flowing into the sewer system is limited, and the rainwater whose inflow is restricted is stored in the storage tank, so that even if there is a heavy rain, the sewer system or the like falls into a malfunction. Can be prevented. In particular, a large effect can be obtained by hiring on a large scale with the cooperation of many citizens and local governments.

In addition, even when rainwater in the rainwater pipe flows into the sewer through the sewage basin of the house, problems such as sewage flowing back from the sewage basin into the house do not occur. Even if the storage tank becomes full, excess rainwater is naturally discharged from the excess water outlet, so that it does not overflow from the eaves connected to the rainwater pipe.

Further, the rainwater collected in the storage tank naturally flows out through the gap and the flow restrictor when a single heavy rain is settled and the amount of rainfall falls below the regulation value by the flow restrictor, so that it can cope with the next heavy rain.

Furthermore, since it is the structure which arrange | positions the cylindrical connection box extended in an up-down direction with respect to a rainwater pipe so that a rainwater pipe may be wrapped, it is space-saving and beautiful.

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, instead of dividing the rainwater pipe into two vertically, a part of the rainwater pipe is cut out to form an opening, and the flow restrictor is formed inside the rainwater pipe on the downstream side of the opening. The aspect provided is illustrated (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, the opening is located in the upper part of the inside of the connection box, and a return hole located in the lower part of the inside of the connection box is provided by cutting out a part of the rainwater pipe. An example in which a hole serves as the total discharge port is described (claim 4).

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

As one preferred embodiment, a mode in which the connection box is installed eccentrically with respect to the rainwater pipe is exemplified (Claim 6). In this case, the connection box is installed with respect to the rainwater pipe by decentering the connection box so that the center axis of the connection box 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 connection box can be reliably attached with respect to a rainwater pipe.

As a preferred embodiment, a cylindrical storage tank extending in the vertical direction is disposed next to a rainwater pipe of a house, the upper end and the lower end of the storage tank are sealed, and the storage tank is connected to the rainwater pipe by an excess water transfer pipe. A flow restrictor is provided downstream of the rainwater pipe from the connection between the excess water transfer pipe and the rainwater pipe, and an excess water discharge port is provided by cutting out at least a part of the upper portion of the storage tank. An example is shown in which the lower part of the storage tank is communicated with the rainwater pipe downstream of the flow restrictor by a return pipe, and the opening of the return pipe serves as the total discharge port (Claim 7).

  As a preferred embodiment, instead of the lower part of the storage tank communicating with the rainwater pipe downstream of the flow restrictor by a return pipe, the lower part of the storage tank is connected by a return pipe to the flow restrictor. An embodiment in which the rainwater pipe is communicated on the upstream side and the opening of the return pipe or the opening of the flow restrictor serves as the total discharge outlet (claim 8).

  As a preferred embodiment, there is exemplified a mode in which the return pipe also serves as the excess water transfer pipe and the opening of the flow restrictor serves as the total discharge port (Claim 9).

As a preferred embodiment, an example is shown in which the upper end open portion of the connection box is closed and sealed, and a part of the upper portion of the peripheral wall of the connection box is cut away to provide the excess water discharge port (invoice). Item 10). That is, the excess water discharge port does not have to be upward, and can be disposed laterally with respect to the connection box.

  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. The upper end opening portion may be provided with a net-like dust-removable dust guard (claim 11).

As a preferred embodiment, a mode in which the flow restrictor is capable of adjusting the flow rate will be exemplified (claim 12).

As a preferred embodiment, the flow restrictor includes at least two flow restrictors provided with eccentric rainwater passage holes on the flow restricting surface, and the overlapping angle of the flow restrictors in a state where the flow restrictors are overlapped with each other. A mode in which the position can be changed is exemplified (claim 13).

As a preferred embodiment, a mode in which the rainwater passage rate of the flow restrictor is 5% to 40% is exemplified (claim 14).

As a preferred embodiment, a mode in which the capacity of the storage tank and the size of the total discharge port are set so that the full storage tank is substantially empty in about 15 to 60 minutes. This is exemplified (claim 15).

A preferred embodiment includes a flow restrictor for restricting the flow rate of rainwater in the rainwater pipe downstream from the underground rainwater pipe, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor, An excess water discharge port for discharging excess rainwater exceeding the capacity of the storage tank to the outside is provided in the upper part of the storage tank, and the storage tank is buried in the ground and the excess water discharge port is on the ground. An embodiment in which it is opened or communicated with the downstream side of the total amount discharge port is exemplified (claim 16).
This is an embodiment when the storage tank of FIG. 9 is buried in the ground (FIG. 13).

As a preferred embodiment, the underground rainwater pipe is divided into two parts, the storage tank is connected between the upstream pipe and the downstream pipe, and at least a part of the upper end of the storage tank is opened so that the excess A mode in which a water flow outlet is provided, a flow restrictor is provided inside the downstream pipe, and an opening of the flow restrictor serves as the total discharge outlet (Claim 17).
This is an embodiment in the case where the storage tank is buried in the ground and also serves as a rainwater tank (FIG. 14).

A preferred embodiment includes a flow restrictor for restricting the flow rate of rainwater in the rainwater pipe downstream from the underground rainwater pipe, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor. An excess water discharge port that flows out excessive rainwater exceeding the capacity of the tank to the outside is provided at the upper part of the storage tank, and in the case of concentrated torrential rain that repeats strong rain falling many times in a short time, The rainwater stored in the storage tank always flows out naturally so that the storage tank is substantially emptied in about 15 to 60 minutes after the first heavy rain is settled until the next heavy rain comes. An embodiment in which an open total discharge port is formed in communication with the storage tank is exemplified (claim 18).

As a preferred embodiment, a part of the side grooves provided on both sides of the road serves as the storage tank, and an opening is provided in the upper part of the downstream water collection tank provided in communication with the storage tank so that the excess water An embodiment in which the flow restrictor is provided in an underground rainwater pipe that discharges rainwater from the storage tank as a discharge port, and the opening of the flow restrictor serves as a full discharge port (claim 19).

As a preferred embodiment, a part of a large underground rainwater pipe that collects and flows rainwater from the gutter serves as the storage tank, and an opening is formed in an upper portion of a downstream water collection tank provided in communication with the storage tank. An example is provided in which an excess water discharge port is provided and the flow restrictor is provided in an underground rainwater pipe that discharges rainwater from the storage tank, and the opening of the flow restrictor serves as a full discharge port (claim 20).

As a preferred embodiment, a mode in which excess water discharged from the excess water discharge port is returned into the rainwater pipe on the downstream side of the flow restriction (claim 21).

A preferred embodiment includes a flow restrictor for restricting the flow rate of rainwater in the rainwater pipe from the rainwater pipe to the downstream side, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor. In the case of torrential rain that repeats the strong rain that falls in a short time many times using the rainwater control device provided in the upper part of the storage tank with the excess water discharge port that flows out the excess rainwater exceeding the capacity, Rainwater stored in the storage tank is stored in the storage tank so that the storage tank is substantially emptied in about 15 to 90 minutes after the first heavy rain has stopped. It flows out naturally from the normally open full-volume discharge port formed in communication (claim 22).

As a preferred embodiment, when performing rainwater control of rainwater pipes in high-rise housing, the time for discharging the total amount of the storage tank on the upper floor is set to about 30 minutes or about 45 minutes, and the time for discharging the total amount of the storage tank on the lower floor is set. 45 minutes or more (claim 23).

As a preferred embodiment, the storage tank on the upper floor is a conventional rainwater storage tank, and a full discharge port is provided at all times, and the intake efficiency of the rainwater intake is set to 20% or more. (Claim 24).

As a preferred embodiment, in order to perform rainwater control of rainwater pipes in high-rise houses, the storage tanks on the upper and lower floors are used as conventional rainwater storage tanks, and a full discharge port is provided at all times, and a rainwater intake is provided. In the configuration where the water intake efficiency is set to 20% or more, in the case of concentrated torrential rain that repeats heavy rain that falls in a short period of time many times, after the first torrential rain has stopped, until the next torrential rain comes Rainwater stored in the storage tank naturally flows out from the total discharge port formed in communication with the storage tank so that the storage tank is substantially emptied in about 15 to 90 minutes. (Claim 25).

As a preferred embodiment, when performing rainwater control of rainwater pipes in high-rise housing, the time for discharging the total amount of the storage tank on the upper floor is set to about 30 minutes or about 45 minutes, and the time for discharging the total amount of the storage tank on the lower floor is set. 45 minutes or more (claim 26).

As a preferred embodiment, the time for discharging the total amount of the storage tank on the lower floor is 1 week or more and 3 weeks or less (claim 27).

As a preferred embodiment, the storage tank is a conventional rainwater storage tank for performing rainwater control of a rainwater pipe in a house, and a full discharge port is provided at all times, and the intake efficiency of the rainwater intake is 20% or more. It is a configuration to be set up, and in the case of concentrated torrential rain that repeats strong rain that falls in a short time many times, it takes 15 to 60 minutes after the first torrential rain until the next torrential rain comes An example in which the total amount discharge port through which rainwater stored in the storage tank flows naturally is formed so as to communicate with the storage tank so that the storage tank becomes substantially empty (Claim 28). .
If the conditions are adjusted even in the conventional rainwater storage tank, the rainwater control device of this patent will be changed.

According to a preferred embodiment, various rainwater control devices of the present patent, the capacity of the storage tank is such that the full storage tank is substantially emptied in about 30 minutes or 45 minutes. And a mode in which the size of the total discharge port is set (claim 29).
Depending on the size of the storage tank, it is shown that it is selected and set for about 30 minutes or 45 minutes.

As a preferred embodiment, the capacity of the storage tank is set to 300 liters or more so that the heavy rain with a rainfall intensity of 80 mm / h or more can be accommodated, and the filled storage tank is substantially empty in about 45 minutes. The aspect in which the capacity of the storage tank and the size of the total discharge port are set so as to become (Claim 30).
In an area where heavy rain falls where the rainfall intensity exceeds 80 mm / h, a large storage tank is required, and there is a need for a side groove storage tank.

As a preferred embodiment, in the rainwater control method of the present patent, the capacity and total amount of the storage tank so that the full storage tank is substantially emptied in about 30 minutes or about 45 minutes. The size of the discharge port is set (claim 31).
Depending on the size of the storage tank, it is shown that it is selected and set for about 30 minutes or 45 minutes.

As a preferred embodiment, when the rainfall intensity corresponds to concentrated heavy rain of 80 mm / h or more, the capacity of the storage tank of the side groove is set to 1600 liters or more, and the storage tank of the side groove that is full is 30 minutes to 90 minutes. The capacity of the storage tank and the size of the total discharge port are set so as to be substantially empty at a certain degree (claim 32).
In areas where heavy rain falls where the rainfall intensity exceeds 80 mm / h, it is necessary to adopt a storage tank in the side groove so that it can be adjusted so that the total discharge time is suitable for actual heavy rain.

As a preferred embodiment, a large number of water storage hollow blocks are embedded in the ground of a road, and the hollow blocks are connected to each other through a communication pipe to form a large storage tank. The water collecting tank and any hollow block To collect rainwater that has fallen on the ground, temporarily hold the water in the large storage tank, and provide a new flow restrictor in the underground rainwater pipe that drains rainwater from any hollow block, and slowly move the large storage tank An embodiment having a whole discharge port for natural drainage over a long time is exemplified (claim 33).

As a preferred embodiment, a mode in which a large storage tank is formed by embedding a large number of rainwater pipes instead of the large number of hollow blocks will be exemplified (claim 34).

As one preferred embodiment, a large number of water storage hollow blocks are arranged and buried in the ground, and the hollow blocks are connected to each other through a communication pipe to form a large storage tank. A water collection tank provided on the ground and an arbitrary hollow A block is connected to collect rainwater that has fallen on the ground, temporarily stored in the large storage tank, and an underground rainwater pipe that discharges rainwater from an arbitrary hollow block is equipped with a flow restriction, and the large storage tank is slowly long. An embodiment having a total discharge port for natural drainage over time is exemplified (claim 35).

As a preferred embodiment, a mode in which a large storage tank is formed by embedding a large number of rainwater pipes instead of the large number of hollow blocks will be exemplified (claim 36).

As a preferred embodiment, a mode in which the time for discharging the total amount of natural drainage of the large storage tank is set to 1 week or more and 3 weeks or less (claim 37) is exemplified.

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 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. The case where the storage tank of FIG. 9 is buried in the ground is shown. The case where the storage tank is buried in the ground and doubles as a rainwater tank is shown. The case where the storage tank of FIG. 7 is arrange | positioned under the veranda of a high-rise house is shown. A storage tank in a high-rise building, just after one heavy rain. It shows the storage tank of a high-rise house, after 30 minutes have passed after a single heavy rain. The storage tank of a high-rise housing, just after the next heavy rain. When the discharge time of the entire storage tank on the lower floor is within 1 week and within 3 weeks. A graph of 400 liters and 200 liters when the rainfall intensity is 60 mm / h. Rainwater control device (simple type) in underground stormwater pipes in the case of diversion sewerage. Rainwater control equipment in underground stormwater pipes in the case of sewerage sewerage. FIG. 21 is an explanatory diagram of a modified example. FIG. 22 is an explanatory diagram of a modified example. A graph of 250 liters when the rainfall intensity is 60 mm / h. The graph of the storage tank of a 1600 liter gutter at the time of rainfall intensity of 80 mm / h. The graph of the storage tank of a 1600 liter gutter at the time of rainfall intensity of 160 mm / h. Kanto / Tohoku heavy rain in September 2015 Indicates heavy rain in the linear precipitation zone. Heavy rain in northern Kyushu in July 2012 Shows heavy rain in the linear precipitation zone. Heavy rain in northern Kyushu in July 2012 Shows heavy rain in the linear precipitation zone. Torrential rain graph Saving tank under the road

  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, a mode in which rainwater of the vertical gutter 10 is introduced into a rainwater gutter 2 a dedicated to rainwater instead of the sewage gutter 2 may be adopted.

  As shown in FIG. 1, a connection box 17 is disposed at the lower part of the vertical fence 10.

As shown in FIG. 2, the connection box 17 is a cylindrical member extending in the up-down direction. The connection box 17 is disposed so as to wrap around the lower end 13a of the upper rod (upper tube) 13 and the upper end 14b of the lower rod (lower tube) 14 of the vertical rod 10 divided into two. The connection box 17 may be a cylindrical type, a rectangular tube type, or a combination type thereof. However, since the vertical rod 10 is usually a cylindrical shape, it is considered that the appearance of the connection box 17 is good if it is cylindrical.

When installing in the existing downspout 10, it is preferable that the connection box 17 is formed by liquid-tight coupling of divided parts that can be combined so as to surround the downspout 10. For example, a mode in which the connection box 17 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. This is a mode in which the connection box 17 is formed around the downpipe 10 by coupling with the two divided parts. If it does in this way, there exists an advantage which can perform the retrofitting operation | work in the case of retrofitting a connection box with respect to the existing vertical shaft easily and rapidly.

The connection box 17 includes an inward flange 18 at the 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 connection box 17 so that rainwater flowing through the vertical rod 10 can also flow into the connection box 17. A space defined by the inner peripheral surface of the connection box 17, the outer peripheral surface of the upper flange 13, and the inward flange 18 becomes a flow path of excess water, and this space becomes the size of the storage tank. The upper end opening of the connection box 17 is an excess water discharge port 20. In FIG. 2, all the upper ends of the connection box 17 are opened to form the excess water discharge port 20. However, the present invention is not limited to this, and a part of the upper end of the connection box 17 may be opened to form the excess water discharge port. it can.

Further, the inward flange 18 is also liquid-tightly connected to the connection box 17 and also serves to fix the connection box 17 and the vertical hook 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 normally closes the excess water discharge port 20 and automatically opens the excess water discharge port 20 by the water pressure in the connection box 17.

  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 connection box 17 and the outer peripheral surface of the upper flange 13 and is located at the upper part inside the connection box 17. . 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 flange 13, and the excess water discharge port 20 is automatically opened and closed according to the water pressure in the connection box 17.

The lid receiver 22 also serves to fix the connection box 17 and the vertical hook 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.

Although the vertical dimension of the gap between the upper ridge 13 and the lower ridge 14 is arbitrary, it can be expanded to the vicinity of the upper end of the connection box 17 as shown in FIG. In this way, the space that becomes the storage tank 19 is slightly expanded from that of FIG.

  In the example of FIG. 2, a flow restrictor 24 that restricts the amount of rainwater flowing into the sewage tub 2 is provided in the lower tub 14. The flow restrictor 24 includes a rainwater flow path (opening 24a) and a flow restricting surface 24b, and the flow restricting surface 24b narrows the area of the flow path (opening 24a) of the lower ridge 14 so that the rainwater pipe moves downstream. Limit the flow of rainwater in the storm water pipe. Rainwater whose flow into the sewage tank 2 is restricted by the flow restrictor 24 is stored in the storage tank 19. When there is so much rain that the storage tank 19 becomes full, excess rainwater exceeding the capacity 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. 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. In the case of concentrated torrential rain that repeats heavy rains that fall in a short period of time, the storage tank is substantially removed in about 15 to 60 minutes after the first torrential rain. The rainwater stored in the storage tank 19 naturally flows out to the downstream side through the flow restrictor 24 so as to be empty.

As will be described later with reference to FIG. 11, 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. The rainwater passage rate of the flow restrictor 24 is substantially empty in about 15 to 60 minutes between the storage tank 19 filled with rainwater and the next heavy rain after the first heavy rain has settled. It is preferable to adjust so that it becomes.

In the example of FIG. 2, the cylindrical connection box 17 extending in the vertical direction is disposed on the vertical rod 10 so as to wrap the vertical rod 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 connection box 17 is closed and sealed with a lid 20 a, and the upper portion around the connection box 17 is closed. 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.

FIG. 4 shows a modification of FIG. The flow restrictor 24 is moved above the connection box 17. 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. The space defined by the inner peripheral surface of the connection box 17, the outer peripheral surface of the vertical rod 10, and the inward flange 18 at the lower end of the connection box 17 is the size (capacity) of the storage tank. The capacity of the storage tank 19 is, for example, 200 to 400 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, the return time (total discharge time) of rainwater from the return hole 99 to the downpile 10 can be adjusted. It is preferable to set the size of the return hole 99 so that the storage tank 19 is substantially emptied in about 15 to 60 minutes after the first heavy rain is settled until the next heavy rain comes.

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 capacity of the storage tank 19 pushes up the lid 21 and flows out from the excess water outlet 20 at the upper end of the connection box 17. 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. When heavy rain comes again, the water storage function of the storage tank 19 is exhibited again.

4, as in the example of FIG. 3, the excess water discharge port 20 at the upper end of the connection box 17 is closed and sealed, and a part of the upper part around the connection box 17 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.

The example of 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 parts vertically, a part of the vertical gutter is notched to form an opening 40, and the downstream side of the notched opening 40 is formed. This is the point that a flow restrictor 24 is provided inside the downpipe 10. The opening 40 communicates with the excess water discharge port 20 in the connection box 17.

  The example of FIG. 6 is also a modification of FIG. In this example, the connection box 17 is installed eccentrically with respect to the downpile 10. This aspect is also applicable to FIGS. 3 to 5 including the connection box 17. In this aspect, the connection box 17 is installed on the vertical fence 10 so that the center axis X1 of the connection box 17 is far from the wall surface W of the house with respect to the central axis X2 of the vertical fence 10. . Thereby, even when the clearance gap between the vertical fence 10 and the wall surface W of a house is small, the connection box 17 can be reliably attached with respect to the vertical fence 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. In other words, in a high-rise house, the rainwater tank becomes full during heavy rain, or if the vertical fence is thin, only the rainwater on the upper floor becomes full, and the rainwater stays on the veranda of the lower-floor house. Problems arise. Therefore, by applying the example of FIGS. 2 to 6 having a storage tank 19 and having a water storage function to the vertical veranda of each floor (especially the lower floor) of a high-rise house, rainwater stays on the veranda during a heavy rain. This can prevent problems that occur and malfunctions of the sewer system. Of course, the larger the capacity of the storage tank 19, the greater the effect.

FIG. 7 is a modification of FIG. This example is a type in which the storage tank 19 is installed beside the vertical fence 10 instead of forming the storage tank 19 by making the vertical fence 10 and the connecting box 17 into 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.

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 return pipe 50 is an element corresponding to the return hole 99 of FIG. 4, and after a single heavy rain has settled, the rainwater in the storage tank 19 is slowly returned to the downpipe 10 downstream of the flow restrictor 24 little by little. It is a total discharge outlet. By appropriately setting the area of the opening of the return pipe 50, the return time from the return pipe 50 of the rainwater in the storage tank 19 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. The storage tank 19 is arranged so that the storage tank is substantially emptied in about 15 to 60 minutes after the one heavy rain is settled and after the one heavy rain is settled until the next heavy rain comes. The rainwater inside naturally flows out to the downpipe 10 through the return pipe 50 at the bottom of the storage tank 19. And when heavy rain comes again, the water storage function of the storage tank 19 comes to be exhibited again.

FIG. 8 is a modification of 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 the same opening area as 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 area of the opening is approximately the same as that of the excess water transfer pipe 15.

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

On the other hand, when the area of the opening of the return pipe 50 is made very small as in FIG. 7, the 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. To do. 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 one heavy rain falls, the rainwater stored in the storage tank 19 passes through the return pipe 50 and the flow restrictor 24 and is discharged to the downstream side. The flow rate at the time of discharge is regulated by the area of the opening of the return pipe 50.

FIG. 9 is a modification of FIG. The return pipe 50 also serves as the excess water transfer pipe 15. The return pipe 50 has the same thickness (opening area) as the excess water transfer pipe 15 in FIG. 8, and the excess water passes through the return pipe 50. In this configuration, the inside of the storage tank 19 is raised or lowered. 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.

  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. In this example, at least a part of the upper end of the storage tank 19 is opened, and the upper end open part 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. An outer end portion 15 a of the excess water transfer pipe 15 opens from the upper end open portion of the storage tank 19 toward the inside of the storage 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.

  In the example of FIG. 10, a discharge hole 88 for discharging rainwater to the outside is disposed at the lower part of the storage tank 19. The discharge hole 88 may be an always open type or an opening / closing type such as a water tap.

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. The storage tank 19 is arranged so that the storage tank is substantially emptied in about 15 to 60 minutes after the one heavy rain is settled and after the one heavy rain is settled until the next heavy rain comes. The rainwater inside naturally flows out to the downpipe 10 through the return pipe 50 at the bottom of the storage tank 19. And when heavy rain comes again, the water storage function of the storage tank 19 comes to be 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.

  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 be continuously or continuously as shown in the example of FIG.

As shown in FIG. 11, at least two flow restrictors 24 each 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 hole and is arranged eccentrically with respect to the center O of the circular flow restricting surface 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. 11 and suspended in the vertical shaft 10 by the latch arms 42 and 42. In this superposed suspension state, as shown by an arrow B in FIG. 11, 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 degree of overlap (opening) of the eccentric rainwater passage holes 44, 44 of the two flow restrictors 24, 24 changes continuously. Thereby, the opening area of the rainwater passage hole 44 defined by the two flow restrictors 24 and 24 is continuously changed, and the rainwater passage rate is adjusted steplessly. According to the example of FIG. 11, the 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 connection box 17, 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 10%, 20%, and 30% 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, the majority (90% or more) of the storage tank 19 in FIGS. 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. For example, FIG. 13 shows an embodiment when the storage tank 19 of FIG. 9 is buried in the ground. Further, FIG. 14 shows a case where the storage tank 19 is buried in the ground and also serves as a rainwater tank. FIG. 15 shows a case where the storage tank 19 of FIG. 7 is arranged under a veranda of a high-rise house. In the case of high-rise housing, a storage tank can be embedded in the veranda, and the excess water outlet can be enlarged to create a “pond” on the veranda.

(4) The capacity of the storage tank 19 so that the full storage tank 19 becomes empty in about 15 to 60 minutes before the next heavy rain comes after the first heavy rain has stopped. And the size of the total discharge outlet.
The size of the degree of overlap (opening) of the eccentric flow-through holes 44, 44 of the flow restrictor 24a and the two flow restrictors 24, 24 and the size of the return hole 99 are appropriately set. Furthermore, setting the area of the opening of the return pipe 50 appropriately also sets the size of the diameter of the return pipe 50. Therefore, these are collectively referred to as setting the size of the total discharge port. The total discharge port is a discharge port that is always open, and is a general term for an opening of a flow restrictor, a return hole, and an opening of a return pipe. Note) “Hole” of return hole is synonymous with opening.

(5) Example of increasing the capacity of the storage tank to 400 liters We will consider the case of increasing the capacity of the storage tank.
<Prerequisites for consideration>

Rainfall intensity is the amount of rainfall that is converted from momentary rain intensity per hour. The unit is “mm / h (millimeter per hour)”.
Assume that one standard heavy rain cycle (rainfall time + subsequent non-rain time) is 60 minutes (rain time 30 minutes + subsequent non-rain time 30 minutes).
In the case of a general detached house, if the area of 60 tsubo and half of the area is 30 tsubo, the area of the house is 30 tsubo x 3.3 square meters = 99 square meters ... about 100 square meters.
Assuming that heavy rain with a rainfall intensity of 80 mm / h has occurred for 30 minutes, the amount of rainfall for 30 minutes on the site area is 100 square meters x 0.08 m x 3/4 = 6 cubic meters = 6000 liters. (See FIG. 31). Assuming that the rain on the roof of the house is divided into four downspouts and flows down, it will flow 1500 liters per downspout. Note) 3/4 = 0.75 → 75%
This time, too, in FIG. 2 of the cited reference 2 (Japanese Patent Laid-Open No. 2000-073417), FIG. 4. Storage tank part Outflow suppression tank section 6. Orifice 7. Spillway 8 Let's do a thought experiment using a drain pipe. Assume that each capacity of the storage tank 4 and the outflow suppression tank 5 is 400 liters.
<When the total discharge time is 120 minutes>

When 1500 liters of rainwater per vertical shaft fills the storage tank part 4 (400 liters) and the outflow control tank part 5 (400 liters) in 30 minutes at the time of the first rainfall, it is set from the orifice during this 30 minutes The drained amount will be drained. If the orifice 6 is set to drain 400 liters in 120 minutes, 100 liters will be drained from the orifice during the 30 minutes of rainfall, so an excess of (700-100) liters will overflow Water is discharged from the spillway 7 and flows into the drain 8 at a stroke. (400 liters) remains in the outflow suppression tank unit 5, but the rainwater in the outflow suppression tank unit 5 becomes (400-100) liters in the non-rainfall time immediately thereafter.
Here, at the raining time of the second cycle, since 400 liters of the storage tank unit 4 are already stored, rain immediately flows into the outflow suppression tank unit 5 and 300 liters in the outflow suppression tank unit 5. The next rainwater (100 liters) is immediately added to the tank, and it becomes full immediately. 100 liters are drained from the orifice 6, and 1300 liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1300/1500 = 0.87. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-100) liters.
Here, at the raining time of the next third cycle, since 400 liters of the storage tank 4 are already stored, rain immediately flows into the outflow suppression tank 5 and 300 liters in the outflow suppression tank 5. The next rainwater (100 liters) is immediately added to the tank, and it becomes full immediately. 100 liters are drained from the orifice 6, and 1300 liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1300/1500 = 0.87. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-100) liters.
<When the total discharge time is 90 minutes>

If the orifice 6 is set to drain 400 liters in 90 minutes, 133 liters will be drained from the orifice 6 during 30 minutes of rain. In 30 minutes during the first rain, the storage tank part 4 (400 liters) is filled, and the outflow suppression tank part 5 is also filled (400 liters). Since it is 133 liters that are drained from the orifice 6 during the 30-minute rain time, the excess (700-133) liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. . (400 liters) remains in the runoff suppression tank part 5, but (400-133) liters of rainwater in the runoff control tank part 5 remains in the non-rainfall time immediately after.
Here, at the raining time of the next second cycle, since 400 liters of the storage tank section 4 has already been stored, rain immediately flows into the outflow suppression tank section 5, and 267 liters in the outflow suppression tank section 5 The next rainwater (133 liters) was added to the water and immediately filled, 133 liters were drained from the orifice 6, and overflowing 1234 liters of excess water was discharged from the spillway 7 and flowed to the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1234/1500 = 0.823. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-133) liters.
Here, at the raining time of the next third cycle, since 400 liters of the storage tank unit 4 has already been stored, rain immediately flows into the outflow suppression tank unit 5 and 267 liters in the outflow suppression tank unit 5. The next rainwater (133 liters) was added to the water and immediately filled, 133 liters were drained from the orifice 6, and overflowing 1234 liters of excess water was discharged from the spillway 7 and flowed to the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1234/1500 = 0.823. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-133) liters.
<When the total discharge time is 75 minutes>

If the orifice 6 is set to drain 400 liters in 75 minutes, 160 liters will be drained from the orifice 6 during 30 minutes of rain. In 30 minutes during the first rain, the storage tank part 4 (400 liters) is filled, and the outflow suppression tank part 5 is also filled (400 liters). Since it is 160 liters that is drained from the orifice 6 during the 30-minute rain time, the excess (700-160) liters of excess water is discharged from the spillway 7 and flows into the drain 8 at a stroke. . (400 liters) remains in the runoff suppression tank part 5, but (400-160) liters of rainwater in the runoff control tank part 5 remains in the non-rainfall time immediately after.
Here, at the raining time of the next second cycle, since 400 liters of the storage tank unit 4 has already been stored, rain immediately flows into the outflow suppression tank unit 5 and 240 liters in the outflow suppression tank unit 5. The next rainwater (160 liters) is immediately added to the tank, and it becomes full immediately. 160 liters are drained from the orifice 6, and 1180 liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1180/1500 = 0.787. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-160) liters.
Here, at the raining time of the next third cycle, since 400 liters of the storage tank 4 are already stored, rain immediately flows into the outflow suppression tank 5 and 240 liters in the outflow suppression tank 5. The next rainwater (160 liters) is immediately added to the tank, and it becomes full immediately. 160 liters are drained from the orifice 6, and 1180 liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. I will go. The degree of flow at a stretch is 1180/1500 = 0.79.
<When the total discharge time is 60 minutes>

If the orifice 6 is set to drain 400 liters in 60 minutes, 200 liters will be drained from the orifice 6 during 30 minutes of rain. In 30 minutes during the first rain, the storage tank part 4 (400 liters) is filled, and the outflow suppression tank part 5 is also filled (400 liters). Since it is 200 liters that is drained from the orifice 6 during the 30-minute rain time, the excess (700-200) liters of excess water is discharged from the spillway 7 and flows to the drain 8 at a stroke. . (400 liters) remains in the outflow suppression tank unit 5, but (400-200) liters remain in the outflow suppression tank unit immediately after the non-rainfall time.
Here, at the raining time of the second cycle, since 400 liters of the storage tank part 4 has already been stored, rain immediately flows into the outflow suppression tank part 5, and 200 liters are added to 200 liters to fill up. 200 liters are drained from the orifice 6, and 1100 liters of overflowing excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at a stroke. The degree of flow at a stretch is 1100/1500 = 0.733. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-200) liters.
Here, at the raining time of the next third cycle, 400 liters of the storage tank 4 are already stored, so rain immediately flows into the outflow suppression tank 5 and 200 liters are added to 200 liters to fill up. 200 liters are drained from the orifice 6, and 1100 liters of overflowing excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at a stroke. The degree of flow at a stretch is 1100/1500 = 0.73. In the non-raining time immediately after that, the rainwater in the outflow suppression tank part 5 becomes (400-200) liters.

<When the total discharge time is 45 minutes>

If the orifice 6 is set to drain 400 liters in 45 minutes, 267 liters will be drained from the orifice 6 during the 30 minute rainfall period. In 30 minutes during the first rain, the storage tank part 4 (400 liters) is filled, and the outflow suppression tank part 5 is also filled (400 liters). Since it is 267 liters that are drained from the orifice during 30 minutes of rain, overflowing (700-267) liters of excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at a stretch. (400) liters remain in the outflow suppression tank 5. 400 liters are stored in the outflow control tank part 5, but (400-267) liters remain in the outflow control tank part 5 immediately after the non-rainfall time.
Here, at the raining time of the second cycle, since 400 liters of the storage tank section 4 has already been stored, rain immediately flows into the outflow suppression tank section 5 and 267 liters are added to 133 liters to fill up. 267 liters are drained from the orifice 6, and 966 liters of excess water overflowing is discharged from the spillway 7 and flows into the drainage pipe 8 at once. The degree of flow at a stretch is 966/1500 = 0.64. In the non-raining time immediately after that, the rainwater in the outflow suppression tank 5 becomes (400-267) liters.
Here, at the raining time of the next third cycle, 400 liters of the storage tank 4 are already stored, so rain immediately flows into the outflow suppression tank 5 and 267 liters are added to 133 liters. 267 liters are drained from the orifice 6, and 966 liters of excess water overflowing is discharged from the spillway 7 and flows into the drainage pipe 8 at once. The degree of flow at a stretch is 966/1500 = 0.64. In the non-raining time immediately after that, the rainwater in the outflow suppression tank 5 becomes (400-267) liters.
<When the total discharge time is 30 minutes>

Furthermore, if the orifice is set to drain 400 liters in 30 minutes, 400 liters will be drained from the orifice during the 30-minute rain time. Then, 1500 liters of rainwater fills the storage tank part 4 (400 liters) and the outflow suppression tank part 5 (400 liters) in the first 30 minutes, but the (400 liters) is drained from the orifice. As a result, overflowing (700-400) liters of excess water is discharged from the spillway 7 and flows into the drain 8 at a stroke. (400) liters remain in the outflow suppression tank 5. 400 liters are stored in the outflow control tank part 5, but (400-400) liters remain in the outflow control tank part 5 in the non-raining time immediately after that. That is, the outflow suppression tank is emptied.
Here, in the raining time of 30 minutes in the next second cycle, 400 liters of the storage tank part 4 is already stored, so rain immediately flows into the outflow suppression tank part 5 and 400 liters are added to fill up. , 400 liters are drained from the orifice 6, and 700 liters of overflowing excess water is discharged from the spillway 7 and flows into the drainage pipe 8 at once. In the non-raining time immediately after that, 400 liters to 400 liters are discharged and emptied from the outflow suppression tank section.
Eventually, 400 liters are drained from the orifice 6 when it rains, 400 liters are discharged even when it is not raining, and 800 liters are drained from the orifice 6.
However, discharging 400 liters in 30 minutes is a flow rate of 13.3 liters / m, and the outflow suppression effect is evaluated as 50% / 1.00 = 50% outflow suppression effect. It is the same as 800 liters × (1−0.50) = 400 liters drained all at once. The degree of flow at a stretch is (400 + 700) /1500=0.73.
<When the total discharge time is 15 minutes>

Also, if the orifice is set to drain 400 liters in 15 minutes, it will be 800 liters drained from the orifice during the 30-minute rain time. Although 1500 liters of rainwater is stored in 700 liters of the outflow suppression tank 5 and remains, it is discharged and emptied when it is not raining. All 1500 liters are drained from the orifice.
When draining 400 liters in 15 minutes, the flow rate is 26.7 liters / m. Compared to the flow rate of 13.3 liters / m, which discharges 400 liters in 30 minutes, (50% / 2.0) 25% It is evaluated as an outflow suppression effect. Since 1500 liters × 0.75 = 1125 liters is drained at a stroke, the degree of flow at a stroke is 1125/1500 = 0.75.
<Graphical consideration results>

If the above consideration result is made into a graph, it will become like FIG. Here, a graph of 400 liters when the rainfall intensity is 60 mm / h and a graph of 200 liters are also shown for reference.
From this consideration, it can be said that in the case of a 200 liter storage tank, the setting of emptying a full storage tank in about 30 minutes is the most effective in suppressing spillage, and in the case of a storage tank of 300 liters or more, it is full. The setting of emptying the storage tank in about 45 minutes is the most effective in suppressing outflow. Even in the case of a 250 liter storage tank, it is calculated that a full storage tank should be emptied in about 30 minutes, but it seems that it is sure to make a judgment based on experimental results in the implementation (see FIG. 25). FIG. 26 is a graph of a 1600 liter side-groove storage tank when the rainfall intensity is 80 mm / h. The structure of the storage tank in the gutter will be similar to that of residential rainwater pipes and storage tanks. It is designed to be proportional to the size of residential rainwater pipes and storage tanks. When the rainwater volume is designed for a 1600 liter storage tank that is four times 400 liters when the amount of rainwater pipes is four, the case where the rainfall intensity is 80 mm / h is compared with the case where the rainfall intensity is 60 mm / h. This is shown in FIG.
The heavy rain in Kanto and Tohoku in September 2015 was a heavy rain in the linear precipitation zone (effect of typhoon) and continued for 2 to 3 hours with heavy rain with a rainfall intensity of 60 mm / h. Torrential rain is limited to one time, but the rainwater control device of this patent cannot handle it completely (Fig. 28). There is nothing but to increase the capacity of the tank and increase the water retention capacity. For this purpose, it is desirable to use a storage tank with a side groove. In June 2016, heavy rain in the linear precipitation zone in Kumamoto Prefecture was a heavy rain of 150 mm / h, and the rainfall increased further. In ordinary houses, a 1600 liter storage tank is not appropriate. In a general house, a rainwater control device having a storage tank of 300 to 400 liters is installed, and a rainwater control device of a storage tank of 1600 liters or more in the lateral groove is used in combination, and these torrential rains and linear precipitation zones (typhoons) It is recommended to take measures against heavy rain (Fig. 27). Examples of the linear precipitation zone of the heavy rain in northern Kyushu in July 2012 are shown in FIGS. In FIG. 29, heavy rain continues three times here, heavy rain of 80 mm / h once, and heavy rain of 50 mm / h twice.
In the case of a ditch storage tank, there is an amount of rainwater that has not yet been calculated. Rainwater that falls on the road and rainwater other than the roof of the house. If these are included, the size of the storage tank in the gutter will need to be larger, but please consider it according to the actual site. Further, there is a case where rainwater from the rainwater pipe in the house flows directly to the rainwater pipe 46A in FIG. In this case, design rainwater that has fallen on the road and rainwater other than the roof of the house to flow into the storage tank in the gutter, and set the total discharge time. The design philosophy that the structure of the storage tank in the gutter is similar to that of the rainwater pipe and storage tank in the house will remain the same. The same applies when a part of the rainwater pipe 46A is used as a storage tank.

(6) Proposal for implementing this patent on high-rise housing

In the case of a high-rise house, there are 70 square meters x 10 units = 700 square meters on the roof because there are 10 units on each floor in a 70-square meter, 50-storey building. If heavy rain is 50 mm / hour, it is 0.05 meters / hour, so 700 × 0.05 = 35 cubic meters, 17.5 cubic meters of rainwater falls on the roof (rain lasts only about 30 minutes) . 1 cubic meter = 100 × 100 × 100 cubic centimeter = 1000000 cubic centimeter (cc) = 1000 liters. (1 liter = 1000 cc).
17.5 x 1000 liters = 17500 liters, ie 17,500 liters.
When 50 liters of rainwater storage tanks are installed in 50 units, 50 × 200 liters = 10000 liters = 10,000 liters of rainwater can be stored, so that 50 storage tanks will be filled in the first 30 minutes of heavy rain.

For example, in the case of a high-rise house on the 20th floor, the storage tanks for about 8 floors on the upper floor are filled with one heavy rain. However, this is the case of a conventional rainwater storage tank. If 1750 liters per house in each floor flows through one rainwater pipe in the vertical direction and 200 liters are taken into the storage tank of each house, 1600 liters for the 8th floor will remain. 150 liters flows down to the rainwater pipe on the lower floor. The intake efficiency of the rainwater pipe intake is 9% of the rainfall. Since this is a theoretical value and actually flows into the rainwater pipe on the lower floor without taking water, it is set to a slightly higher water intake efficiency of about 10 to 20%. Assuming that 30% of the 1750 liters flow down to the lower floor rainwater pipes without taking water, 200 liters will be stored on the 6th floor of the upper floor. More than 100 liters will be stored in the remaining two upper floors.

In addition, it is not included in the calculation because the amount of rainwater that falls from the side to the veranda of each house is small.
If this patent is adopted, the storage tank of each house will be provided with a full discharge port that is always open, so 200 liters will be discharged from the discharge port during 30 minutes of heavy rain. The intake should be set to take 20% or more of the rainfall. When the one heavy rain is settled, the storage tanks for the upper 8 floors will be empty in about 15 to 60 minutes. The storage tank on the lower floor also has a total capacity of 200 liters, so if rain water for the 8th floor from the storage tank on the upper floor flows down to the rainwater pipe on the lower floor, the tank will also have a water intake efficiency of 20% or more. 400 liters, which is twice the capacity, is taken in, 200 liters of which are stored, and 200 liters of the total volume flows from the outlet to the rainwater pipe downstairs. Even in the storage tank on the lower floor, 200 liters are likely to be stored for several floors. The same situation is repeated in the next heavy rain.
As is clear here, the storage tanks for the 12th floor of the lower floor also repeat the rainwater storage and the total discharge one after another, and discharge the rainwater to the sewer pipe.

Some of the heavy rain of each time is temporarily stored in a storage tank on each floor, and the rest of the rainwater goes directly to the sewer pipe without taking water. Although it is difficult to clarify in detail through thought experiments, it is possible to suppress the outflow to the sewer pipe of storm water every heavy rain, and to prevent the sewer pipe from becoming full.
The water intake efficiency is the ratio at which water can be taken from the water intake when the rainwater pipe (longitudinal shaft) is full. The shape of the water intake is arbitrary, but in general, the water intake is provided along the center or the inner surface of the vertical shaft (see Japanese Patent Application Laid-Open No. 2009-56786, Utility Model Registration No. 3148793).
As a proposal for further improving the countermeasure against the torrential rain, if the 12th floor of the lower floor is used as the storage tank of this patent, the rain water of the single heavy rain can be temporarily retained for a longer time.
At this time, if the time for discharging all of the storage tanks for the 12th floor of the lower floor is changed to 30 minutes or more, the time for temporary water retention can be further increased.

  The storage tank on the upper floor can also be the storage tank of this patent. Using the rainwater control device of this patent, when performing rainwater control of rainwater pipes in high-rise housing, the total tank discharge time of the upper floor is about 30 minutes or 45 minutes, and the total discharge of the lower floor storage tank is reduced. The time is 45 minutes or more. In that case, we think that it is better to control the amount of rainwater from the excess water discharge port by changing the rainwater passage rate of the flow restriction of the storage tank on the upper floor from 40% to 5% for each floor. It is.

FIG. 16 is an assumption diagram immediately after a storage tank of a high-rise house and one heavy rain. FIG. 17 is an assumption diagram after 30 minutes have elapsed after a storage tank of a high-rise house and a single heavy rain have settled. FIG. 18 is an assumption diagram immediately after a storage tank of a high-rise house and the next heavy rain. This is almost the same as in FIG. 16, but the rain water of the single heavy rain in the storage tank on the lower floor is empty, and only some rain water remains in the storage tank on the lowermost floor. Most of the rainwater is slowly discharged from the discharge outlet into the rainwater basin, which is effective in suppressing runoff. (2) indicates that the storage tank is 200 liters full, ▲ indicates 100 liters or more, and ★ indicates 100 liters or less.

The setting for discharging the entire amount of the storage tank on the lower floor to 30 minutes or more can be set to one week or more in the case of a high-rise house. By doing so, for example, if heavy rain continues for 4 cycles (about 4 hours), the storage tanks on all the floors of the apartment house on the 20th floor in FIG. 18 can be filled. FIG. 19 shows the state. In the case of an apartment house on the 50th floor, it can cope with a heavy rain that continues for 10 cycles (about 10 hours), and the storage tanks on all floors can be filled.
In addition, it is possible to use the rain water in the storage tank for various purposes by setting it to one week or more and within three weeks at the maximum. In the case of high-rise housing, a storage tank can be embedded in the veranda, and the excess water outlet can be enlarged to create a “pond” on the veranda (FIG. 15).

(7) FIG. 21, FIG. 22, FIG. 23 and FIG. 24 disclose a rainwater control device in an underground rainwater pipe in the case of a shunt sewer. This is a developed form when the storage tank 19 described in (3) is buried in the ground, and is a countermeasure when the cooperation of residents of each local government (city) is not easily obtained. As shown in FIG. 22, a part of the side groove 39 having a length L1 provided on both sides of the road is used as a storage tank. In this storage tank, rainwater from the rainwater pipe 4 in the underground of the house and rainwater that has fallen on the road 36 flow into the water collecting tank 37 communicated with the side groove 39, so that a larger amount of rainwater can be stored.

Moreover, the part of length L2 of the large rainwater pipe 46A in the basement can also be used as a storage tank. In this case, it is assumed that there is a large underground rainwater pipe 46B (main pipe) or river. Water collecting tanks 37 and 38 are provided at both ends of the side groove 39 and the rain water pipe 46A used as the storage tank, and the rain water pipes (rain water pipes 4, 4a, 4b, 46a and 48b) are connected to the water collecting tanks 37 and 38. The upstream side of the water collection tanks 37 and 38 communicates with the storage tank, and the downstream side is sealed.

When a part of the side groove 39 having a length L1 is used as a storage tank, an opening is provided in the upper part of the downstream water collecting tank 37 to form an excess water discharge port 20e, which communicates with the downstream side of the flow restrictor 45 of the underground rainwater pipe 4a. Let The rainwater pipe 4a connects the water collecting tank 37 of the side groove 39 to the large rainwater pipe 46A side.
Even when the portion of the length L2 of the large underground rainwater pipe 46A is used as a storage tank, an opening is provided in the upper part of the downstream water collection tank 38 to form an excess water discharge port 20e, and downstream of the flow restrictor 45 of the underground rainwater pipe 4b. Communicate to the side. The rainwater pipe 4b connects the water collecting tank 38 of the large rainwater pipe 46A and the large rainwater pipe 46B side, and sends all rainwater including excess water to the next large rainwater pipe 46B on the downstream side. The flow restrictor 45 is preferably provided upstream of the rainwater pipe 4a and / or the rainwater pipe 4b.

FIG. 21 is a simple type, and an existing gutter and a large rainwater pipe A can be easily modified. The excess water discharge port 20e is provided by cutting out the upper side (sealed portion) of the water collecting tanks 37 and 38 on the downstream side of the side groove 39 and the large rainwater pipe 46A. Instead of connecting the excess water discharge port 20e to the downstream side of the flow restrictor 45 of the underground rainwater pipes 4a and 4b, the upper part (sealed part) is cut out to the side groove or the rainwater pipe downstream from the side groove 39 or the rainwater pipe 46A. Excess water is sent out through the excess water outlet 20e provided. In these cases as well, in the case of concentrated heavy rain that repeats the heavy rain that falls in a short time many times, after the one heavy rain has settled, it takes 15 to 60 minutes before the next heavy rain comes. The total amount is discharged from the total amount discharge port so that the tank is substantially emptied. The opening of the flow restrictor is the total discharge port. Due to the structure of sending excess water through the excess water outlet 20e provided by cutting out the upper part (sealed part) to the downstream side groove or rainwater pipe cascaded to the side groove 39 or the rainwater pipe 46A, the excess water outlet 20e is Set larger. Accordingly, the capacity of the storage tank is reduced. In addition, after a plurality of storage tank side grooves 39 or a part of the rainwater pipe 46A are connected in cascade, it is necessary to provide only one storage tank without a flow restriction and discharge the accumulated excess water.

In this embodiment, rainwater flows into the storage tank from the water collecting tanks 37 and 38 communicated with the storage tank, and is stored in a state of flowing back upstream. However, the present invention is not limited thereto, and the downstream side of the water collection tank can be communicated with the storage tank, and the upstream side can be sealed. (The detailed description is omitted, but the major difference is that, in the case of FIG. 24, the storage tank and the rainwater pipe 4a, or the storage tank and the rainwater pipe 4b are connected through the excess water discharge port 20e. .
In addition, it is necessary to cover the gutter with a lid or wire mesh so that dust does not enter from above.
In the case of a stormwater control device for underground stormwater pipes, similar stormwater control is possible if designed in a form proportional to the size of the stormwater pipes and storage tanks in the house.

(8) FIG. 32 is a plan for adding a storage tank below the road to the storage tank in the gutter. The embodiment of this patent when FIG. 1 and FIG. 2 of Japanese Patent Publication No. Hei 10-1981 are adopted is shown.
If the rainfall intensity of torrential rain increases further to 100-150mm / h, the single rainfall will be unacceptable even in the side tank. In preparation for such a situation, a storage tank under the road is added to the storage tank in the ditch. This is disclosed in FIGS. 1 and 2 of Japanese Patent Publication No. Hei 10-1981 in which a storage tank (hollow block) under the road is buried.
I quote a part of it.

Solution

A large number of hollow blocks 1 are buried side by side in the ground such as roads, parks, parking lots, etc., and each hollow block 1 is connected to each other by a communication pipe 2, and an arbitrary hollow block is connected to a rainwater collecting part. The pump 4 is connected to the hollow block, and the rainwater stored in the hollow block 1 is taken with the pump 4 and used as a water source for fire fighting water, irrigation, and waterworks.
This is adopted in this patent, and rainwater that cannot be accepted by the storage tank in the gutter is taken in and temporarily retained.
A large number of hollow blocks for water storage are buried side by side in the ground, and these hollow blocks are connected to each other through a communication pipe to form a large storage tank. A water collecting tank provided on the ground is connected to an arbitrary hollow block, and it rains on the ground. The total amount of natural drainage of the large storage tank over a long period of time with a flow restrictor in the underground rainwater pipe that collects the collected rainwater and temporarily retains it in the large storage tank and discharges the rainwater from any hollow block A rainwater control device having a discharge port is configured. In this case, the opening of the flow restrictor becomes the total discharge port.
The storage tank (hollow block) under the road is a large storage tank that is several to tens of times larger than the storage tank in the gutter, so after a torrential rain has completely passed, slowly take a long time of 1 to 3 weeks. The whole amount is discharged. The hollow block may be an underground rainwater pipe having a length corresponding to the width of the road, for example. Rather, I think that the cylindrical rainwater pipe can guarantee the strength of the road.
Moreover, it seems that the storage tank of a side groove may not be required. A part of rainwater is directly received from a conventional ditch into a large storage tank under the road, temporarily stored, and after the heavy rain has passed, it is slowly discharged over a long period of 1 to 3 weeks. As such, the capacity of the large storage tank and the size of the opening of the flow restrictor are set.
In addition, since the rainwater in the large storage tank is simply drained and discarded, if it is sprayed on the road etc. for one to three weeks to dissipate the ground surface, it will cause concentrated heavy rain. It will help to eliminate the heat island phenomenon.
Furthermore, as described in the paragraph number 0124, in the case of high-rise houses, the storage tanks on all the floors of the 20th floor apartment can be filled by setting the total discharge time to one week or more. . In this case as well, water can be dissipated by spraying water on the walls of a high-rise residential building.

According to the survey, just building the underground storage pipe 66 (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: Cost of burying 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 of 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.

What must be actually countered is the heavy rain that falls suddenly in a short time (for example, 10 minutes). Here, torrential rain refers to repeated heavy rains that fall in a short period of time. Alternatively, the torrential rain means a localized, short-time (for example, 10 minutes) heavy rain, that is, a large amount of short-term rain continuously falling over a limited area (FIG. 31). reference). 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>
Quote: Characteristics of how rain falls in localized heavy rains and concentrated heavy rains Heavy rains that fall in a short period of time can occur both in localized heavy rains and in heavy 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 downpipe and stored in the drum can. After the rain stops, it is sprayed on the site and thrown away, or it is discharged to 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 15 to 60 minutes, the next heavy rain can be dealt with again. This is a function similar to that of a conventional underground storage pipe. The rainwater discharged from the 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 a nearby river.

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.

As a storage tank 19 (connection box 17) of the type shown in FIGS. 2 to 6, for example, when a cylinder with a diameter of 30 cm is used, the cross-sectional area of the cylinder is about 3.14 × 15 × 15 = 706 cm ^2. In order to obtain a capacity of 200 liters per drum can, a height of about 280 cm is required.

Even if the connection box 19 of the above size is attached to each of the vertical fences at the four corners of the house, it is presumed that the aesthetic appearance is not impaired so much. If the connection box is too thick and you are still worried about its beauty, 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.

Compared to the data of 6.9 billion yen for the burial cost of the 24,000m ³ storage pipe, it is necessary for 30,000 households to work together, assuming that one household can hold four extra storm waters in drums. There is. 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, the cooperation of 300 buildings is required. 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) + burial pipe 8}
6 Sewage sources (toilet, etc.)
20 Excess water outlet 21 Lid 17 Connection box 18 Inward flange 19 Storage tank 24 Flow restrictor 26 Adjustment lever (operation member)
40 Opening 43 24b Flow restricting surface 44 Rainwater passage hole 50 Return pipe 55 Sewer 66 Reservoir pipe 99 Return hole

Claims (37)

A flow restrictor for limiting the flow rate of rainwater in the rainwater pipe from the rainwater pipe to the downstream side, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor.Excess rainwater exceeding the capacity of the storage tank is externally provided. An excess water discharge port is provided at the upper part of the storage tank, and in the case of a heavy rain that repeats the heavy rain that falls in a short time many times, In order for the storage tank to become substantially empty in about 15 to 60 minutes before the heavy rain comes, a normally open full discharge outlet from which rainwater stored in the storage tank naturally flows is provided in the storage tank. A rainwater control device formed in communication.   In the rainwater control device according to claim 1, the rainwater pipe of the house is divided into two parts vertically, and a cylindrical connection box extending in the vertical direction is provided so as to wrap the lower end of the upper pipe and the upper end of the lower pipe, The connection box includes an inward flange at a lower end and at least a part of the upper end is opened. The inward flange is liquid-tightly connected to an outer peripheral surface of the lower tube, and the upper tube and the lower tube are connected to each other. A space defined by the inner peripheral surface of the connection box, the outer peripheral surface of the upper pipe, and the inward flange is connected to the inside of the connection box, and the excess water storage tank is connected to the inside of the connection box. A rainwater control device in which a flow restrictor is provided inside the lower pipe, an upper end open portion of the connection box serves as an excess water discharge port, and an opening of the flow restrictor serves as the full discharge port. In the rainwater control apparatus according to claim 2, instead of dividing the rainwater pipe into two parts up and down, a part of the rainwater pipe is notched to form an opening, and the rainwater pipe on the downstream side of the opening is inside the rainwater pipe. Rainwater control device with a flow restrictor.   The rainwater control device according to claim 3, wherein the opening is located at an upper part inside the connection box, and a return hole located at a lower part inside the connection box is provided by cutting out a part of the rainwater pipe. The rainwater control device in which the return hole serves as the total discharge port. (Not shown, targets 2-5)
The rainwater control apparatus according to any one of claims 2 to 4, wherein the connection box 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 connection box is installed eccentrically with respect to the rainwater pipe. 2. The rainwater control apparatus according to claim 1, wherein a cylindrical storage tank extending in a vertical direction is arranged beside a rainwater pipe of a house, the storage tank is sealed at an upper end and a lower end, and the storage tank is an excess water transfer pipe. Is connected to the rainwater pipe, and a flow restrictor is disposed downstream of the connection portion between the excess water transfer pipe and the rainwater pipe, and at least a part of the upper portion of the storage tank is cut away to remove excess water. A rainwater control apparatus in which an outlet is provided, a lower portion of the storage tank is communicated with the rainwater pipe at a downstream side of the flow restrictor by a return pipe, and an opening of the return pipe serves as the total discharge port.   8. The rainwater control apparatus according to claim 7, wherein the lower part of the storage tank is connected to the rainwater pipe downstream of the flow restrictor by a return pipe, and the 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 an opening of the return pipe or an opening 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 an opening of the flow restrictor serves as the total discharge port. The rainwater control device according to any one of claims 2 to 6, wherein an upper end opening portion of the connection box is closed and sealed, and a part of an upper portion of a peripheral wall of the connection box is cut out to cut the excess water discharge port. Providing rainwater control device.   The rainwater control device according to claim 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, and the upper end of the storage tank A rainwater control apparatus in which an outer end portion of the excess water transfer pipe is opened toward an open portion. The rainwater control apparatus according to any one of claims 2 to 11, wherein the flow restrictor is capable of adjusting a flow rate.   The rainwater control device according to any one of claims 2 to 11, wherein the flow restrictor includes at least two flow restrictors provided with eccentricity of rainwater passage holes on the flow restrictor, and the flow restrictors are overlapped with each other. A rainwater control apparatus in which a superposition angle position of the flow restrictor can be changed in a state. The rainwater control apparatus according to any one of claims 2 to 13, wherein a rainwater passage rate of the flow restrictor is 5% to 40%. The rainwater control device according to any one of claims 2 to 14, wherein the capacity of the storage tank and the size of the total discharge port are set so that the full storage tank is substantially emptied in about 15 to 60 minutes. Sato is a rainwater control device. In the rainwater control device according to claim 1, a flow restrictor for restricting the flow rate of rainwater in the rainwater pipe from the underground rainwater pipe to the downstream side, a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor, And an excess water discharge port for discharging excess rainwater exceeding the capacity of the storage tank to the outside is provided in an upper part of the storage tank, and the storage tank is buried in the ground and the excess water discharge is provided. A rainwater control device in which an outlet is opened to the ground or communicated with a downstream side of the total discharge port.   The rainwater control device according to claim 16, wherein the underground rainwater pipe is divided into two, the storage tank is connected between the upstream pipe and the downstream pipe, and at least a part of the upper end of the storage tank is opened. A rainwater control device in which the excess water discharge port is provided, a flow restrictor is provided in the downstream pipe, and an opening of the flow restrictor serves as the full discharge port. A flow restrictor for limiting the flow rate of rainwater in the rainwater pipe downstream from the underground rainwater pipe, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor, and excess rainwater exceeding the capacity of the storage tank. After the heavy rain has settled, during the torrential rain that repeats the heavy rain that falls in a short time many times In order for the storage tank to become substantially empty in about 15 to 60 minutes before the next heavy rain comes, the normally open full discharge outlet from which the rainwater stored in the storage tank naturally flows is stored in the storage tank. A rainwater control device formed in communication with the tank. 19. The rainwater control apparatus according to claim 18, wherein a part of the side grooves provided on both sides of the road serves as the storage tank, and an opening is provided in an upper part of a downstream water collection tank provided in communication with the storage tank. A rainwater control device, wherein the flow restrictor is provided in an underground rainwater pipe that discharges rainwater from the storage tank, and the opening of the flow restrictor serves as a full discharge port. The rainwater control device according to claim 18, wherein a part of a large underground rainwater pipe that collects and flows rainwater from the gutter becomes the storage tank, and an upper part of a downstream water collection tank provided in communication with the storage tank. A rainwater control device in which an opening is provided in the outlet to provide an excess water discharge port, and the flow restrictor is provided in an underground rainwater pipe for discharging rainwater from the storage tank, and the opening of the flow restrictor serves as a full discharge port. 21. The rainwater control apparatus according to claim 19 or 20, wherein excess water discharged from the excess water discharge port is returned into the rainwater pipe at a downstream side of the flow restrictor. A flow restrictor for limiting the flow rate of rainwater in the rainwater pipe from the rainwater pipe to the downstream side, and a storage tank for storing rainwater whose flow rate is restricted by the flow restrictor.Excess rainwater exceeding the capacity of the storage tank is externally provided. After a single heavy rain has settled, during a heavy rain that repeats the heavy rain that falls in a short time many times using a rainwater control device provided at the upper part of the storage tank with an excess water discharge port that flows out to The rainwater stored in the storage tank is formed in communication with the storage tank so that the storage tank is substantially empty in about 15 to 90 minutes before the next heavy rain comes. A rainwater control method characterized by flowing naturally from an open full discharge port. 23. The rainwater control method according to claim 22, wherein when the rainwater control of the rainwater pipe of the high-rise house is performed, the time for discharging the total amount of the storage tank on the upper floor is about 30 minutes or about 45 minutes, and the total amount of the storage tank on the lower floor is discharged The rainwater control method is characterized in that the time is 45 minutes or more. The rainwater control method according to claim 23, wherein the storage tank on the upper floor is a conventional rainwater storage tank, and a full discharge port is provided at all times, and the intake efficiency of the rainwater intake is set to 20% or more. A characteristic rainwater control method. In order to control rainwater in rainwater pipes in high-rise houses, the storage tanks on the upper and lower floors are used as conventional rainwater storage tanks, and all the discharge outlets are always open, and the intake efficiency of the rainwater intake is 20% or more. In the configuration to be set, in the case of concentrated torrential rain that repeats the heavy rain that falls in a short time many times, after the one heavy rain has settled, it takes about 15 to 90 minutes before the next heavy rain comes A rainwater control method characterized in that rainwater stored in the storage tank naturally flows out from the total discharge port formed in communication with the storage tank so that the tank is substantially empty. 26. The rainwater control method according to claim 25, wherein when performing rainwater control of a rainwater pipe of a high-rise house, the time for discharging the total amount of the storage tank on the upper floor is about 30 minutes or about 45 minutes, and the total amount of the storage tank on the lower floor is discharged. The rainwater control method is characterized in that the time is 45 minutes or more. 27. The rainwater control method according to any one of claims 23 to 26, wherein the time for discharging the entire amount of the storage tank on the lower floor is set to 1 week or more and 3 weeks or less. In order to perform rainwater control of the rainwater pipe of a house, the storage tank is a conventional rainwater storage tank, and a full discharge port is provided at all times, and the intake efficiency of the rainwater intake is set to 20% or more, In the case of concentrated torrential rain that repeats heavy rains that fall in a short period of time, the storage tank is substantially removed in about 15 to 60 minutes after the first torrential rain. The rainwater control apparatus in which the total discharge port from which rainwater stored in the storage tank flows naturally is formed in communication with the storage tank so as to be empty. 29. The rainwater control apparatus according to any one of claims 1 to 21 and claim 28, wherein the capacity of the storage tank is such that the full storage tank becomes substantially empty in about 30 minutes or about 45 minutes. And a rainwater control device in which the size of the total discharge outlet is set. 29. The rainwater control apparatus according to any one of claims 1 to 21 and claim 28, wherein the storage tank has a capacity of 300 liters or more so that it can cope with a heavy rain with a rainfall intensity of 80 mm / h or more, and is full. A rainwater control device in which the capacity of the storage tank and the size of the total discharge port are set so that the storage tank becomes substantially empty in about 45 minutes. 26. In the rainwater control method according to claim 22 or claim 25, the capacity of the storage tank and the total amount of outlets are adjusted so that the full storage tank is substantially empty in about 30 minutes or about 45 minutes. A rainwater control method characterized in that a size is set. 23. In the rainwater control method according to claim 22, when the rainfall intensity corresponds to concentrated heavy rain of 80 mm / h or more, the capacity of the storage tank in the gutter is set to 1600 liters or more, and the storage tank that is full is from 30 minutes to 90 minutes. A rainwater control method, wherein the capacity of the storage tank and the size of the total discharge port are set so as to be substantially empty in about a minute. The rainwater control device according to claim 19, wherein a large number of water storage hollow blocks are arranged and buried in the ground of the road, and the hollow blocks are connected to each other by a communication pipe to form a large storage tank, and the water collecting tank and any The large-sized storage tank is provided with a new flow restrictor in an underground rainwater pipe that collects rainwater that has fallen on the ground by connecting a hollow block and temporarily stores water in the large-sized storage tank and discharges rainwater from any hollow block. A rainwater control device that has a full-volume outlet that slowly drains naturally over a long period of time. 34. The rainwater control apparatus according to claim 33, wherein a plurality of rainwater pipes are buried in place of the plurality of hollow blocks to form a large storage tank. A large number of hollow blocks for water storage are buried side by side in the ground, and these hollow blocks are connected to each other through a communication pipe to form a large storage tank. A water collecting tank provided on the ground is connected to an arbitrary hollow block, and it rains on the ground. The total amount of natural drainage of the large storage tank over a long period of time with a flow restrictor in the underground rainwater pipe that collects the collected rainwater and temporarily retains it in the large storage tank and discharges the rainwater from any hollow block A rainwater control device having a discharge port. 36. The rainwater control apparatus according to claim 35, wherein a large number of rainwater pipes are buried in place of the plurality of hollow blocks to form a large storage tank. 37. The rainwater control apparatus according to claim 35 or 36, wherein a total amount discharge time for naturally draining the large storage tank is 1 week or more and 3 weeks or less.

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