JP2011038295A - Rainwater drainage structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater drainage structure capable of reducing required area of its installation space as much as possible and exchanging the rainwater stored always in it with new flowing-in rainwater in accordance with the flow-in even when it receives rainwater furthermore while it is still full with rainwater. <P>SOLUTION: This rainwater drainage structure 5 for draining the rainwater fallen down on a building 1 includes water collection parts 21a, 21b for collecting the rainwater fallen on the building 1 primarily and a drain part 23 connected with a public drainage system 90 installed out of its site. The whole drain path 22 from downstream side parts of the water collection parts 21a, 21b to an upstream side part of the drain part 23 is used as a water storage part A. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rainwater drainage structure laid in a house or the like.

  Recently, with the increase in urban areas, etc., the amount of water supply has increased, water shortages have become serious, the impervious area of groundwater has increased, and urban heat islands have become a problem due to the rise in surface temperature. . On the other hand, it is sufficient to use rainwater without washing water for car washing or garden irrigation, etc., which also saves water usage. For the above reasons, attempts have been made to adopt a structure for storing rainwater so that rainwater can be used effectively in a house. For example, a configuration in which a rainwater tank having a large capacity is provided at an appropriate location in a house is known.

By the way, there is a problem that the rainwater tank becomes not only more expensive as it becomes larger, but also requires a space and cost for installing the rainwater tank.
In order to solve such a problem, Patent Document 1 discloses that a horizontal tank is formed by connecting a plurality of pipes in parallel with each other in a horizontal manner, and a water collection / drainage pipe, a vent pipe, and a drain pipe are formed in the horizontal tank. The structure which formed the underground water storage tank by communicating etc. is disclosed. According to the underground water storage tank, a horizontal tank can be configured by cutting a commercially available pipe according to a desired capacity or site, and a pipe that forms a horizontal tank according to the size of the site. It is said that the capacity of the horizontal tank can be adjusted by increasing / decreasing the number of tanks, and the problem of space and cost can be solved.

JP 09-137479 A

  However, the underground water storage tank of Patent Document 1 also requires a separate space for installing the horizontal tank, and it is still necessary to secure a certain space as the installation space for the horizontal tank. There is room for further improvement. The rainwater stored in the horizontal tank is drained into the drainage groove by opening and closing the drain pipe cock, and the cock must be opened and closed according to the amount of rainwater stored and the amount of rainwater flowing in. The amount of rainwater in the tank cannot be maintained properly. In addition, since the pipe and the tank connected to the tank that receives the rainwater are connected in series, and the horizontal tank is provided by branching between these, when rainwater is fully stored in the horizontal tank, There is also a problem that the rainwater from the pipe flows into the pump with a direct current without flowing rainwater into the horizontal tank, so that the rainwater in the horizontal tank cannot be replaced at all and the water quality is lowered.

  The present invention has been made to solve such a problem, and the rainwater that is always stored with the inflow of the rainwater is reduced even if the installation space is reduced as much as possible and the rainwater is further received when the water is full. The purpose is to provide a rainwater drainage structure that can be replaced.

(1) As a concrete means for solving the above problems, the present invention provides
In the rainwater drainage structure for draining either or both of rainwater raining on the building and the site where the building is constructed,
A water collecting section that primarily collects one or both of rainwater that is rained on the building and the site;
A drainage section connected to a public drainage system laid outside the site;
With
The drainage path from the downstream part of the water collection part to the upstream part of the drainage part is a water storage part throughout.

  According to this, since the drainage path itself is formed as a water storage part, it is not necessary to provide a separate tank or the like for storing rainwater, and the space can be significantly reduced. In addition, since it is provided as a drainage channel for circulating rainwater from the catchment part toward the drainage part, the rainwater in the catchment part will flow down appropriately due to the inflow of rainwater from the catchment part. The rainwater stored in the department can always be replaced. At the same time, since rainwater flows from the upstream side to the downstream side of the drainage path, which is the water storage part, every time rainwater flows in from the water collection part, the inner wall of the drainage path is washed along with the flow of the rainwater, As a result, contamination of the drainage path can be reduced.

(2) In addition, the water reservoir
One or a plurality of recumbent portions formed with a water gradient, the upstream end portion being connected to the downstream portion of the water collecting portion, and flowing rainwater toward the downstream end portion;
A water receiving tank connected to the downstream end of the one or more recumbent portions,
The drainage portion is located above the bottom edge of the downstream portion positioned at the lowest position among the downstream end portions of the one or more recumbent portions, and is the most among the upstream end portions of the one or more recumbent portions. It is characterized by being connected to the water receiving tank at a position below the upper edge of the upstream end positioned higher.

According to this, rain water can be stored in the recumbent part from which rain water flows down and the water receiving tank itself. Since the recumbent part is intended to flow rainwater toward the water receiving tank (drainage ditch) in the first place, the space for storing rainwater coincides with the space for drainage, so a separate space for storing water is provided. There is no need for this, and a significant space saving can be achieved.
In addition, since rainwater is stored in the recumbent part that sends out rainwater in this way, even if sufficient rainwater is stored in the recumbent part, if rainwater flows into the upper end part of the recumbent part, it is stored in the receiving tank. The amount of rainwater equivalent to the rainwater that has flowed into the reeds flows into the drainage channel from the drainage pipe and is discharged. Therefore, the rainwater that is always stored by the inflow of rainwater is replaced, and deterioration of the quality of the stored rainwater can be prevented.

(3) In view of such points, in the rainwater drainage structure for draining rainwater that is rained on a site or a building constructed on the site,
The water collecting part that collects and guides the rainwater is connected to a horizontal part that is drawn directly or via a water receiving tank, is connected to the water receiving tank via the horizontal part, and the water receiving tank It has a piping structure that is connected to the public drainage system via the drainage part that is pulled from
The recumbent part and the water receiving tank located below the pipe bottom of the drainage part connected to the public drainage system, or the water receiving part, the recumbent part and the water receiving tank are set as a water storage part capable of temporarily storing rainwater. It is also preferable to characterize.

(4) Moreover, it is preferable that the said recumbent part is formed in piping shape, and is embed | buried under the ground. According to this, the water storage part is not exposed to the ground, and it is possible to prevent dust and the like from entering rainwater stored in the water storage part. Moreover, the upper part of the drainage path can be effectively used as a planting space, a parking space, or the like.
(5) Moreover, it is preferable that the said horizontal collar part is formed with an internal diameter of 200phi-300phi. Thereby, sufficient rain water can be stored in a recumbent part. On the other hand, if the diameter of the recumbent part is formed to be remarkably large, for example, 300φ or more, not only is installation difficult and connection with the water receiving tank becomes difficult, but also the relationship with the adjacent boundary line and the foundation of the building This may cause a problem that it is difficult to properly place the recumbent part on the site. From this point of view, it is preferable to have a horizontal portion having an inner diameter as described above.

(6) In view of this point, the building is a middle- or low-rise apartment house or a detached house, and the reed part has an inner diameter that is two to three times that of the wastewater treatment pipe used in the house. Preferably it is formed.
(7) Furthermore, it is preferable that the said water collection part is a gutter which receives the rain water rained on the roof of the said building.
According to this, only the rain water which fell on the roof etc. of the building can be stored in a water storage part, and the purity of the stored water can be raised.

  According to the rainwater drainage structure of the present invention, the installation space can be reduced as much as possible, and even when rainwater is further received when it is full, the rainwater that is always stored along with the inflow of the rainwater can be replaced.

It is a side view of the building provided with the rainwater drainage structure of this embodiment. It is a top view of the building provided with the rainwater drainage structure of this embodiment. It is a side view which shows the water storage state of the rainwater drainage structure of this embodiment. It is another side view which shows the water storage state of the rainwater drainage structure of this embodiment. It is a side view of the rainwater drainage structure of other embodiment. It is a side view of the rainwater drainage structure of other embodiment.

Hereinafter, an embodiment of a building 1 including a rainwater drainage structure 5 according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a building 1 according to this embodiment includes a building housing 2, a water supply system 3 that supplies clean water to the building housing 2, and a rainwater drainage structure 5 that drains rainwater that falls on the building housing 2. It has. The rainwater drainage structure 5 is connected to a public drainage system 90 disposed as a U-shaped groove outside the site of the building 1.
In the present embodiment, the rainwater includes not only rainwater but also water that has once accumulated in the building 2 and melted and processed through the rainwater drainage structure.
The building housing 2 is an assembly house on the second floor formed by including a structural housing assembled on a foundation and an outer wall 10 supported by the structural housing. The building housing 2 has a land roof portion 11 formed with a water gradient.

The living room formed in the building housing 2 is provided with water supply facilities such as kitchens, washrooms, and bathroom water. The water supply system 3 is connected to the public water main 91. A water pipe 12 is provided and is connected to each water use facility in the living room.
The rainwater drainage structure 5 is connected to the flat roof portion 11 of the building 1 and temporarily collects rainwater that falls on the flat roof portion 11, and the rainwater flowing into the water collection portion 21 is directed to the public drainage system 90. And a drainage section 23 that connects the drainage path 22 and the public drainage system 90.
The building 2 includes a first land roof portion 11a that forms a roof on the second floor and a second land roof portion 11b that forms a roof on the first floor, and the first water collecting portion 21a is connected to the first land roof portion 11a. At the same time, the second water collecting portion 21b is connected to the second flat roof portion 11b.

Each water collecting part 21a, 21b is connected to the downstream part of the water gradient of the flat roof part 11a, 11b, and connected to the connecting part 25a, 25b and along the outer wall 10 of the building housing 2. In this case, the rainwater received vertically at the connection portions 25a and 25b is made to flow down toward the drainage passage 22 and connected to the downstream portions of the flange portions 26a and 26b. Purification separators 27a and 27b for purifying rainwater are provided.
In this embodiment, each of the flat roof portions 11a and 11b is provided with one water collecting portion 21a and 21b. However, depending on the capacity of the water collecting portion and the size of the flat roof portion, they are arranged. The number of water collecting sections should be changed as appropriate.
The drainage path 22 includes a pair of water receiving basins 31a and 31b connected to the separator 27 of the water collecting section 21, and lateral basins 32a and 32b formed by extending laterally from the water receiving basins 31a and 31b. And a water receiving tank 33 connected to the downstream end of the horizontal flange portions 32a and 32b.

In the present embodiment, the first receiving basin 31a is provided at a position far from the receiving tank 33, and the second receiving basin 31b is provided at a position closer to the receiving tank 33 than the first receiving basin 31a. Yes. Each of the water receiving basins 31a and 31b is made of concrete or resin in the shape of an open top box and buried in the ground, and culvert lids 35a covering the upper portions of the casket main bodies 34a and 34b, 35b, and through-holes 36a and 36b are formed in the side portions of the main body 34a and 34b, respectively.
Each of the reeds 32 a and 32 b is formed in a cylindrical shape with resin embedded in the ground, and is located far from the water receiving tank 33 and the first water receiving tank 31 a far from the water receiving tank 33. The first recumbent portion 32 a that connects the two water receiving basins 31 b and the second recumbent portion 32 b that connects the second receptive basin 31 b and the water receiving tank 33 are provided.

The first recumbent portion 32a is disposed so as to be inclined downwardly from the first receiving trough 31a to the second receiving trough 31b, and the second recumbent portion 32b is received from the second receiving trough 31b. The bottoms of the first recumbent portion 32a and the second recumbent portion 32b are gradually inclined from the first receiving trough 31a toward the second receiving trough 31b and the receiving trough 33. It is low. In addition, the central axes of these recumbent portions 32a and 32b coincide with each other, and the inclination angles of these descending gradients are the same.
Moreover, each recumbent part 32a, 32b is formed to have an inner diameter of at least 200φ to 300φ, which has an inner diameter that is two to three times the inner diameter (100φ) of a pipe used as the drainage portion 23, for example. It will have. Or it has an internal diameter 2 to 3 times the internal diameter (100φ) of a pipe used as a drain pipe of a normal low-rise detached house.

The water receiving tank 33 is made of concrete or resin, and is formed in a box shape with an open top larger than each of the water receiving tanks 31a and 31b and embedded in the ground, and the upper part of the water tank main body 41 And a water tank lid 42 for covering.
The water tank main body 41 has a through hole 43 formed on one side and connected to the second horizontal flange 32b, and a through hole 44 formed on the other side and connected to the drain 23.
The drainage part 23 is embedded in the ground by forming the resin into a cylindrical tube. Further, the drainage section 23 connected to the water receiving tank 33 is in a state where the tube bottom at the end on the water receiving tank side is positioned slightly below the upper edge of the upstream end portion of the first horizontal flange 32a. It is connected to the water tank 33, is extended downwardly from the position, and is connected to the public drainage system 90.

  As a result, when rainwater enters the drainage path 22 through the water collecting portions 21a and 21b, first, the rainwater passes through the water receiving basins 31a and 31b and the horizontal bales 32a and 32b, and appropriately enters the water receiving tank 33. Will be stored. Further, when rainwater further flows into the drainage path 22, further rainwater is stored in the water receiving tank 33, but the drainage part 23 for draining the rainwater stored in the water receiving tank 33 is provided with the first side wall 32a. Is connected to the water receiving tank 33 at a position slightly below the uppermost edge, that is, at least at a position higher than the upper edge of the downstream end portion of the second lateral rib portion 32b. The recumbent portion 32b enters and rainwater is also stored in the second recumbent portion 32b.

  Thereafter, as rainwater is further stored, the water level in the drainage path 22 further rises, and as shown in FIG. 3, rainwater is also stored in the second water receiving basin 31b and the first reed portion 32a. Become. After that, when rainwater is further stored and the water level in the drainage path 22 rises, as shown in FIG. 4, the rainwater is finally stored in the first receiving trough 31a, and the water level finally reaches the water receiving tank. 33 reaches the height of the pipe bottom of the drainage part 23 connected to 33, and rainwater is drained from the drainage part 23 as appropriate.

  As a result, the entire drainage path 22 from the downstream part of the water collection part 21 to the upstream part of the drainage part 23 is formed as a water storage part A. Since the drainage path 22 itself is used as the water storage part A and is configured to store rainwater, normally, the horizontal underground drainage pipes for simply flowing rainwater toward the water receiving tank 33 are respectively provided to the respective lateral parts 32a and 32b. In this case, the inner diameter thereof is made significantly larger than the inner diameter of a normal drainage pipe, so that sufficient rainwater can be stored in the lateral flange portions 32a and 32b.

  In order to use the rainwater stored in the drainage path 22 in this way, the water receiving tank 33 is connected to the middle water system 50 as shown in FIG. The middle water system 50 includes a middle water suction pipe 51 having one end provided with a filter inserted in the bottom of the water receiving tank 33, a middle water pump 52 connected to the other end of the middle water suction pipe 51, The intermediate water discharge pipe 53 connected to the discharge side of the intermediate water pump 52, the check valve 54 interposed in the intermediate water discharge pipe 53, and the pressure tank and the pressure that is the control means for the intermediate water pump 52 And a switch 55.

Further, the middle water suction pipe 51 is connected to a middle water pipe 56 arranged toward each room in the building 1, and at the end of the middle water pipe 56, a toilet or the like or watering equipment The middle water utilization equipment 57 is connected.
Further, a water pipe 12 is extended from the water main of the water supply system 3 to the water tank 33, and a ball tap 62 is connected to the water pipe 12, and the ball tap 62 is used for storing water stored in the water tank 33. It is floating.

  This embodiment consists of the above composition, and in this embodiment, when rain water rains on the flat roof parts 11a and 11b of the building 1, the rain water will follow the water gradient of the flat roof parts 11a and 11b. The water flows down and flows into the drainage path 22 via the water collecting portions 21a and 21b. The drainage channel 22 functions as a water storage unit A, and rainwater flowing into the water storage unit A is not drained to the public drainage system 90 via the drainage unit 23, but is first stored in the water storage unit A. Will be. The stored rainwater is supplied to the middle water utilization facility 57 via the middle water system 50. In the middle water system 50, when middle water is used in the middle water utilization facility 57, the supply of the middle water starts from the inside of the pressure tank. Then, the pressure switch 55 is closed and the middle water pump 52 is activated based on the signal. Then, when the use of the intermediate water by the intermediate water utilization facility 57 is stopped, the pressure in the pressure tank increases, the pressure in the intermediate water pipe 56 and the intermediate water discharge pipe 57 also increases, and the pressure switch 55 is opened. Based on this, the middle water pump 52 stops.

As described above, the rainwater stored in the reservoir A through the intermediate water utilization facility 57 is used, and the rainwater in the reservoir A is reduced. However, if there is precipitation again at that timing, the reservoir is appropriately stored. Rainwater stored in the part A is supplied through the water collecting part 21 as appropriate. On the other hand, when rainwater is not supplied in a timely manner as described above, the ball tap 62 is activated as the water level in the water receiving tank 33 is lowered, and the water is replenished to the water receiving tank 33 from the water supply system 3 through the water distribution pipe 12. Is done.
Thereby, constant water is always stored in the water storage part A, and there is no possibility that the middle water utilization facility 57 becomes unusable.

  According to the rainwater drainage structure 5 of the present embodiment, since the drainage path 22 itself is formed as the water storage portion A, it is not necessary to provide a separate tank or the like for storing rainwater, and the space can be significantly reduced. Further, a drainage path 22 is formed in a downwardly inclined shape from the water collection parts 21a, 21b toward the drainage part 23, and rainwater that has flowed into the drainage path 22 from the water collection parts 21a, 21b is appropriately directed to the drainage part 23. It will flow. For this reason, the drainage path 22 is appropriately washed by the flow of rainwater, and can maintain a clean state. Moreover, since the water collection parts 21a and 21b are provided on the upstream side of the drainage path 22 and the drainage part 23 is provided on the downstream side of the drainage path 22, rainwater flows from the water collection part 21 when the water storage part A is full or close to it. When the water flows in, the rainwater that has been stored up to that time is drained from the drainage part 23, and the water stored in the water storage part A is always replaced, and the quality of the water stored in the water storage part A is deteriorated. Is suppressed.

In addition, since rainwater can be stored in the reeds 32a and 32b and the receiving troughs 31a and 31b that send rainwater toward the drainage unit 23, the space for storing rainwater and the space for the drainage match, A space for storing water is not secured separately, and the space is significantly reduced.
Further, since the drainage path 22 is embedded in the site, the water storage part A is not exposed to the ground, and it is possible to improve the appearance of the site and effectively utilize the upper part of the water storage part A.
Further, since the water collecting part 21 is formed as a trap for receiving rainwater that is rained on the flat roof part 11, only rainwater that has fallen on the roof of the building 1 can be stored in the water storage part A, and the stored water. The degree of cleanliness of the water can be increased, and rainwater that has only been drained in the past can be effectively used as middle water.

As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. 5, even the drainage path 22 formed by connecting a plurality of reeds to one water receiving tank 33 has the same effects as the present invention. In this case, the pipe bottom on the water receiving tank side of the drainage portion 23 is above the bottom edge of the downstream portion positioned at the lowest among the downstream end portions of the plurality of recumbent portions, and the plurality of recumbent portions If the upstream end portion is connected to the water receiving tank 33 at a position lower than the upper edge portion of the upstream end portion that is positioned highest, at least a part of the drainage path 22 may be the water storage portion A. It becomes possible.
Of course, when the drainage path 22 is formed as a single unit, the pipe bottom on the water receiving tank side of the drainage part 23 is positioned at least above the bottom edge of the downstream end part of the horizontal part that forms the drainage path 22. As long as it is connected to the water receiving tank 33, at least a part of the drainage path 22 can function as the water storage section A.

On the other hand, if the drainage portion 23 is provided at a position higher than the upstream end portion of the recumbent portion, the rainwater stored from the upstream end side of the recumbent portion overflows before draining from the drainage portion 23. Therefore, the drainage portion 23 is provided below the upstream end portion of the recumbent portion.
Moreover, although the number of the water collection parts 21 which a recumbent part receives is two in this embodiment, you may be three or more. Moreover, an open drainage groove can be adopted as the horizontal flange, and even the drainage groove has the same effect as the present embodiment.

In addition, even if a configuration in which the water collecting portion 21 and the purification separator are connected to the horizontal reed portion with no water receiving reed is present, the same operational effects as the present embodiment can be obtained.
In addition, the water collecting unit 21 may adopt a configuration for collecting rainwater that is rained in the site of the building 1. In this case, when adopting a structure in which rainwater such as a concrete surface is allowed to flow down, the separator 27 as described above can be adopted as the area where the rainwater falls, but the area is grounded or the like. In the case where a rainwater that can flow down as muddy water is adopted, a precipitation tank is provided in front of the separator 27, and the precipitation tank and the separator 27 are connected to purify the rainwater and drain the water. 22 may be possible.

  Further, as shown in FIG. 6, the ball tap 62 connected to the water supply system 3 may be configured to be provided in the water receiving basins 31 a and 31 b that are upstream ends of the drainage path 22. In this case, the water supplied from the water supply system can also flow from the upstream to the downstream of the drainage path 22, and the drainage path 22 can be washed with the water.

DESCRIPTION OF SYMBOLS 1 Building 2 Building frame 3 Water supply system 5 Rainwater drainage structure 21a 1st catchment part 21b 2nd catchment part 22 Drainage path 23 Drainage part 31a 1st catchment 31b 2nd catchment 32a 1st horizontal part 32b 2nd Recumbent part 33 Receiving tank 50 Middle water system 57 Middle water use facility 62 Ball tap 91 Public drainage system 92 Public water supply piping A Water storage part

Claims (7)

In the rainwater drainage structure for draining either or both of rainwater raining on the building and the site where the building is constructed,
A water collecting section that primarily collects one or both of rainwater that is rained on the building and the site;
A drainage section connected to a public drainage system laid outside the site;
With
A rainwater drainage structure characterized in that the drainage path from the downstream part of the water collecting part to the upstream part of the drainage part is a water storage part throughout. The water reservoir is
One or a plurality of recumbent portions formed with a water gradient, the upstream end portion being connected to the downstream portion of the water collecting portion, and flowing rainwater toward the downstream end portion;
A water receiving tank connected to the downstream end of the one or more recumbent portions,
The drainage portion connected to the water receiving tank is above the bottom edge of the downstream portion positioned at the lowest position among the downstream end portions of the one or more recumbent portions, and the one or more recumbent portions The rainwater drainage structure according to claim 1, wherein the rainwater drainage structure is connected to the water receiving tank at a position below the upper edge portion of the upstream end portion positioned highest among the upstream end portions. In the rainwater drainage structure that drains rainwater that is rained on the site or a building constructed on the site,
The water collecting part that collects and guides the rainwater is connected to a horizontal part that is drawn directly or via a water receiving tank, is connected to the water receiving tank via the horizontal part, and the water receiving tank It has a piping structure that is connected to the public drainage system via the drainage part that is pulled from
The recumbent part and the water receiving tank located below the pipe bottom of the drainage part connected to the public drainage system, or the water receiving part, the recumbent part and the water receiving tank are set as a water storage part capable of temporarily storing rainwater. Drainage structure characterized by   The rainwater drainage structure according to claim 2 or 3, wherein the recumbent part is formed in a pipe shape and embedded in the ground.   The rainwater drainage structure according to claim 2 or 3, wherein the recumbent part has an inner diameter of 200φ to 300φ. The building is a medium or low-rise apartment or detached house,
The rainwater drainage structure according to claim 2 or 3, wherein the recumbent part has an inner diameter that is two to three times as large as a wastewater treatment pipe used in the house. The rainwater drainage structure according to any one of claims 1 to 6, wherein the water collecting portion is a gutter that receives rainwater that is rained on a roof of the building.

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