JP2010043420A - Water intake device and rainwater storage system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply water, from which the foreign matter is removed, into a rainwater storage tank, and therefore dispensing with the operation of removing foreign matter in the rainwater storage tank by means of a suction hose etc, and reduce a burden of maintenance of the rainwater storage tank. <P>SOLUTION: A water intake device 12 including a tank body 18 formed, for example, like a bottomed cylinder separates the mixed foreign matter from the rainwater, takes out the water from which the foreign matter is removed, and supplies the water to the rainwater storage tank 14. An inflow portion 30 is formed, for example, on the side surface of the tank body 18, and the rainwater flows into the tank body 18 from an inflow pipe 24 through the inflow port 30. An exhaust port 32 is formed, for example, on the bottom surface of the tank body 18, and the foreign matter separated from the rainwater is discharged with the water through an exhaust pipe 26 from the exhaust port 32. Additionally, the tank body 18 includes an intake pipe 28. A lower end of the intake pipe 28 is opened downward in a height position lower than the pipe bottom of the inflow pipe 24, and the opening functions as an intake 36. The water, from which the foreign matter is removed, is taken out of the intake pipe 28 through the intake 36, and supplied into the rainwater storage tank 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water intake device and a rainwater storage system using the same, and in particular, for example, a water intake device that separates foreign matters mixed in from rainwater flowing in, takes out treated water from which foreign matters are removed, and supplies the treated water to a rainwater storage tank. And a rainwater storage system using the same.

  In recent years, inundation damage due to local heavy rains and heavy rains during typhoons has been increasing with environmental changes due to urbanization. As a measure to prevent this damage, a rainwater storage tank is buried underground, and after rainwater is temporarily stored, it is discharged into rainwater pipes and rivers, or is gently permeated into the ground as it is. . However, since the rainwater collected in the rainwater storage tank contains foreign matters such as fallen leaves and earth and sand, the foreign matter tends to be accumulated in the rainwater storage tank. If foreign matter accumulates in the rainwater storage tank, it may not be possible to maintain its function properly. Therefore, it is necessary to perform periodic inspections and cleaning to appropriately remove foreign matter accumulated in the rainwater storage tank.

  For example, in a rainwater underground storage and penetration tank (rainwater storage tank) disclosed in Patent Document 1, a sludge pit is provided under the storage tank. And the foreign substance (foreign matter) which flowed into the storage tank is settled in the sludge pit, and the deposited sediment is sucked and removed using a suction hose. However, the work of removing the precipitate using the suction hose is time-consuming and requires special equipment such as a suction hose. Furthermore, the internal structure of the storage tank is complex, and the inflowing foreign matter ranges from non-precipitation foreign matter with a low density (specific gravity) floating in rainwater to high-density sedimentary foreign matter that does not move and stay in the storage tank. It is difficult to collect all foreign matter that has flowed into the storage tank in the sludge pit. For this reason, in the technique of patent document 1, it seems that it will be necessary to clean the inside of a storage tank using some means separately from the removal of the deposit in a sludge pit.

  As a measure to prevent foreign matter from accumulating in the rainwater storage tank, it is considered that rainwater is treated in advance upstream of the rainwater storage tank, and rainwater (treated water) from which foreign matter has been removed flows into the rainwater storage tank. It is done. For example, it is a common practice to provide a sand settling tank in a rainwater inflow pipe through which rainwater flows into the rainwater storage tank. In this case, precipitated foreign matters having a high density are removed by being precipitated in a sand settling tank, and non-precipitating foreign matters having a low density are removed using a net-like filter. However, even in this case, the foreign matter accumulated in the sand settling tank must be periodically removed by a suction hose or the like. Further, the filter is likely to be clogged, and therefore needs to be periodically cleaned.

In addition, a water separation device is provided on the upstream side of the rainwater storage tank to separate the foreign matter mixed in the rainwater and take out the treated water from which the foreign matter has been removed, and supply this treated water to the rainwater storage tank. Is also possible. For example, in the vortex type solid-liquid separation device (dividing device) disclosed in Patent Document 2, a non-treated liquid such as rainwater flows into a cylindrical water tank (dividing tank) from a supply path, and sedimentary substances such as sand ( Precipitated foreign matter) is settled and separated, and non-sedimentable material (non-precipitated foreign matter) is also captured and separated by being drawn to the center by a vortex. And the isolate | separated solid substance is extracted from the extraction part of a water tank lower part, and the treated water from which the said solid substance was removed is pumped up via a discharge channel.
JP 2002-294665 A [E02B 5/02] JP 2006-97378 [E03F 5/22]

  As described above, in the technique of Patent Document 1 and the technique of providing a sand settling tank upstream of the rainwater storage tank, an operation for removing foreign matters using a suction hose or the like is required, and maintenance is troublesome.

  Moreover, even if the vortex solid-liquid separation device of Patent Document 2 is provided on the upstream side of the rainwater storage tank, the supply path and the discharge path for supplying the non-treatment liquid are provided at substantially the same height. When the water level in the cylindrical water tank rises to reach the discharge channel, non-sedimentable substances (non-precipitated foreign matter) mixed in the non-processed liquid flowing in from the supply channel float on the water surface and are discharged together with the treated water. It will flow out of the road. Moreover, since the discharge path is provided in the side part of the cylindrical water tank, for example, when the centrifugal force of the vortex generated in the cylindrical water tank is applied to the non-sedimentable substance, the non-settled substance is converted into the cylindrical water tank. It will scatter to the side part inside, and will flow out of a discharge channel with treated water as it is.

  Therefore, a main object of the present invention is to provide a novel water intake device and a rainwater storage system using the same.

  Another object of the present invention is to provide a water intake device and a rainwater storage system using the same that can reduce the burden of maintenance and management of the rainwater storage tank.

  Still another object of the present invention is to provide a water intake device and a rainwater storage system using the same that can appropriately remove non-precipitated foreign matter.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  1st invention isolate | separates the foreign material mixed from the inflowing rainwater, takes out the water except the foreign material, and supplies it to a rainwater storage tank, Comprising: The tank main body formed in a bottomed cylindrical shape, An inflow pipe for allowing rainwater to flow into the tank body through an inlet provided in the tank body, a discharge pipe for discharging foreign matter in the tank body through an outlet provided lower than the inlet, and a position lower than the inlet And a water intake device including a water intake pipe for taking out water through a water intake provided at a higher position than the discharge port.

  In the first invention, the water intake device (12) includes, for example, a tank body (18) formed in a bottomed cylindrical shape, separates foreign matter mixed in from rainwater, and takes out water from which the foreign matter has been removed. To the rainwater storage tank (14). An inlet (30) is formed in the tank body, and rainwater flows into the tank body from the inlet pipe (24) through the inlet. Further, a discharge port (32) is formed at a height position lower than the inflow port in the tank body, and foreign matter separated from rainwater is discharged together with water from the discharge port (32) through the discharge pipe (26). . Furthermore, a water intake pipe (28) is provided in the tank body. The intake pipe is, for example, lower than the inlet and opened at a higher position than the outlet, and the opening functions as the intake (36). And the water from which the foreign material was removed is taken out from the intake pipe through this intake port, and is supplied to the rainwater storage tank.

  According to 1st invention, the water from which the foreign material was removed by the water intake apparatus can be taken out, and the water can be supplied to a rainwater storage tank. For this reason, the operation | work which removes the foreign material in a rainwater storage tank using a suction hose etc. is unnecessary. Therefore, the burden of maintenance management of the rainwater storage tank can be reduced.

  Furthermore, since the intake port is positioned lower than the inlet and at a higher position than the outlet, the precipitated foreign matter mixed in the rainwater flowing into the tank body from the inlet pipe is stored in the tank. It settles at the bottom of the main body and flows into the outlet, and even if non-precipitated foreign matter floats on the water surface, it does not flow into the water intake.

  The second invention is dependent on the first invention, the inflow port is provided on a side surface of the tank body, the discharge port is provided on the bottom surface of the tank body, and the intake port is an inlet pipe in the tank body. Provided lower than the tube bottom.

  In 2nd invention, an inflow port (30) is provided in the side surface of the tank main body (18), and an inflow pipe (24) is attached to this inflow port. Further, a discharge port (32) is provided on the bottom surface of the tank body, and a discharge pipe (26) is attached to the discharge port. Furthermore, the water intake pipe (28) has a water intake (36) at a height position lower than the bottom of the inflow pipe inside the tank body.

  A third invention is dependent on the first or second invention, wherein the central axis of the inflow port is decentered at a predetermined angle with respect to the radial direction of the tank body, and the water intake is disposed at the center of the tank body.

  In 3rd invention, a tank main body (18) is formed in a bottomed cylindrical shape, and the water intake (36) in a water intake pipe (28) is arrange | positioned in the center part. The inflow pipe (24) is attached to the tank body with the central axis of the inlet (30) being eccentric at a predetermined angle with respect to the radial direction of the tank body (18). It is connected in the tangential direction.

  According to the third aspect of the invention, rainwater that has flowed eccentrically into the tank body flows spirally inside the tank body while forming a vortex flow, and foreign substances mixed in the rainwater can be separated by the vortex flow. Furthermore, even if the centrifugal force due to the vortex is applied to the non-precipitation foreign matter, the non-precipitation foreign matter does not flow into the water intake. Therefore, it is possible to appropriately separate non-precipitated foreign matter mixed in rainwater.

  The fourth invention is dependent on any one of the first to third inventions, and extends the intake pipe into the tank body and opens the intake port downward.

  In 4th invention, the upper end of the tank main body (18) is sealed by the top plate (34), for example, and the intake pipe (28) is penetrated by the center part of this top plate. The intake pipe is extended to the inside of the tank body, and the lower end thereof opens downward as an intake port (36).

  According to the fourth invention, the non-precipitated foreign matter floating on the water surface can be retained around the intake pipe without flowing into the intake port. Therefore, it is possible to more appropriately separate the non-precipitated foreign matter mixed in the rainwater.

  A fifth invention is dependent on any one of the first to fourth inventions, wherein the tank body has an inclined bottom surface inclined downward toward the discharge port, and the discharge port is disposed at a lower end portion of the inclined bottom surface. The

  In 5th invention, the bottom face of the tank main body (18) inclines below, for example toward the center part, and the discharge port (32) is arrange | positioned at the lower end part of this inclined bottom face (22). For this reason, the settled foreign matter settled at the bottom of the tank body is smoothly guided to the discharge port, and the precipitated foreign matter is appropriately discharged from the discharge pipe (26).

  6th invention is a rainwater storage system provided with the water intake apparatus of any one of 1st thru | or 5th invention, and the rainwater storage tank which stores the water taken out from the water intake pipe.

  In 5th invention, a rainwater storage system (10) contains a water intake device (12) and a rainwater storage tank (14), and the foreign material mixed in rainwater is isolate | separated by the water intake device (12), and a foreign material is removed. Water is taken out and supplied to the rainwater storage tank (14). In an Example, the water taken out from the water intake device is received by the outer tank (20), supplied from the outer tank to the rainwater storage tank via the connection pipe (44), and stored in the rainwater storage tank.

  According to the sixth aspect, the same effect as the first aspect can be expected.

  A seventh invention is according to the sixth invention, further comprising a vortex-type diversion device that separates foreign matter by causing a vortex in the inflowing water, and divides the water from which the foreign matter has been removed. The water intake device and the rainwater storage tank were connected via a water diversion device.

  In the seventh invention, the rainwater storage system (10) includes a water intake device (12), a vortex diversion device (16), and a rainwater storage tank (14), and the water intake device and the rainwater storage tank are swirled. It is connected via a formula water diverter. In such a rainwater storage system, first, foreign matter mixed in rainwater is separated by the water intake device, and water taken out by the water intake device is introduced to the water diversion device. Next, the water diverter separates the foreign matter by causing a vortex in the inflowing water, and divides the water excluding the foreign matter. And the water from which the foreign material was further removed by the water diverter is supplied to the rainwater storage tank.

  According to the seventh invention, even if there is a foreign matter that could not be removed by the water intake device, the foreign matter can be separated and removed by the water diverter. Therefore, it is possible to improve the maintainability of the entire rainwater storage system.

  According to this invention, since only the water from which the foreign matter has been removed is supplied to the rainwater storage tank, it is possible to reduce the burden of maintenance of the rainwater storage tank.

  Furthermore, according to the present invention, the non-precipitated foreign matter floating on the water surface does not flow into the water intake, so that the non-precipitated foreign matter mixed in the rainwater can be appropriately separated.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  Referring to FIG. 1, a rainwater storage system 10 according to an embodiment of the present invention includes a water intake device 12 and a rainwater storage tank 14. The water intake device 12 separates foreign matter mixed in rainwater and removes the foreign matter. The removed water (treated water) is taken out and supplied to the rainwater storage tank 14.

  However, in this embodiment, the water intake device 12 and the rainwater storage tank 14 are connected via an eddy current water diverter (hereinafter simply referred to as “water diverter”) 16, and the treatment taken out by the water intake device 12. Water (first treated water) is introduced into the water diverter 16, and treated water (second treated water) from which foreign matter is further removed by the water diverter 16 is supplied to the rainwater storage tank 14.

  First, the rainwater storage tank 14 will be briefly described. The rainwater storage tank 14 is embedded in the basement mainly for the purpose of preventing inundation damage. For example, the rainwater storage tank 14 is formed by assembling plastic element members and covering the periphery with a water shielding sheet or a water permeable sheet. The Such a rainwater storage tank 14 collects rainwater from a ditch or rainwater trough, temporarily stores the rainwater, and then discharges it into a rainwater main or the like, or gently permeates it into the ground as it is. As a result, the concentration of rainwater inflow into rivers, rainwater mains, etc. in the case of torrential rain, etc., is suppressed, and inundation damage is prevented. The stored rainwater can also be effectively used for watering plants and emergency water in case of disaster.

  Specifically, as the rainwater storage tank 14, for example, various rainwater storage tanks manufactured and sold by the applicant of the present application (see; http://www.kuHotH-ci.co.jp/rHin/ind_H. html <http://www.kubota-ci.co.jp/rain/ind_b.html>). In addition, the water intake device 12 is connected to various conventionally known rainwater storage tanks regardless of the material (made of synthetic resin, concrete, etc.) or shape such as the rainwater storage tank disclosed in Patent Document 1 mentioned above. You can also.

  In addition, the rainwater storage tank 14 is classified from the viewpoint of function, and has a “storage type” mainly having a function of temporary storage, a “penetration type” mainly having a function of infiltration, and functions of both temporary storage and infiltration. The rainwater storage tank 14 in the present invention is a concept including all of these three types.

  As shown in FIGS. 1 and 2, the water intake device 12 includes a tank body 18 that separates foreign substances from rainwater, and an outer tank 20 that houses the tank body 18, and a ground near the rainwater storage tank 14. Buried inside.

  As shown in FIG. 3, the tank body 18 is made of a synthetic resin such as vinyl chloride, and is formed in a cylindrical shape having an inclined bottom surface 22 that is inclined downward toward the center. Although it sets suitably by a magnitude | size etc., in this Example, the outer diameter of the tank main body 18 is 630 mm, and the length is 1000 mm, for example.

  The tank body 18 is provided with an inflow pipe 24 for flowing rainwater, a discharge pipe 26 for discharging foreign matter separated from the rainwater together with water, and a water intake pipe 28 for taking out the first treated water from which the foreign matter has been removed.

  Specifically, an inlet 30 is formed on the side surface of the tank body 18, and through this inlet 30, rainwater collected from a gutter on the side of the road, a rain gutter, and the like flows into the tank body 18 from the inlet pipe 24. . The inflow pipe 24 extends through the outer tank 20 to the tank body 18 and is connected to the tank body 18 in a tangential direction. The inner diameter of the inflow pipe 24 is appropriately set according to the assumed inflow amount of rainwater, and is, for example, 350 mm.

  In addition, a discharge port 32 is formed at the lower end of the inclined bottom surface 22, and foreign matter separated from rainwater from the discharge port 32 through the discharge pipe 26 is discharged together with water to a rainwater main pipe or a combined sewer pipe. As will be described in detail later, the discharge pipe 26 joins the valve 48 of the water diverter 16, passes through the outer tub 20, and is connected to a rainwater main pipe, a combined sewer pipe, and the like. The discharge pipe 26 has a flow restriction orifice, and the flow rate is appropriately set according to a predetermined allowable discharge flow rate. Here, the “allowable discharge flow rate” is a flow rate that is allowed to be discharged downstream from the outflow facility during rain, and is determined by, for example, the flow capacity of the downstream river or sewer pipe. The discharge pipe 26 is also adjusted so that its flow rate is less than the amount of treated water taken out from the water intake pipe 28, and its inner diameter is, for example, 100 mm.

  Further, the upper end of the tank body 18 is sealed by a top plate 34, and a water intake pipe 28 is inserted through the central portion of the top plate 34. The intake pipe 28 extends to the inside of the tank body 18, and the lower end portion opens downward at a height position lower than the bottom of the inflow pipe 24, and the opening functions as the intake port 36. To do. And the 1st treated water in the tank main body 18 is taken out from the intake pipe 28 through the water intake 36, and this 1st treated water is led to the water diversion tank 46 of the water diverter 16 mentioned later. The intake pipe 28 extends toward the water divide tank 46 in the outer tub 20 and is connected to a side surface of the water divide tank 46. The inner diameter of the intake pipe 28 is appropriately set according to the inner diameter of the inflow pipe 24 and the inner diameter of the discharge pipe 26, and is, for example, 250 mm. In the water intake pipe 28, a plurality of water passage holes 38 are formed in the pipe wall in the tank main body 18, whereby the precipitated foreign matter collected near the center of the tank main body 18 is sucked into the water intake 36. Is prevented.

  The outer tub 20 is formed in a rectangular parallelepiped shape or a cylindrical shape from synthetic resin, concrete, metal, or the like, and accommodates the tub body 18 as described above. Although the details will be described later, the outer tub 20 is a part for receiving treated water. In this embodiment, the outer tub 20 receives the second treated water overflowing from the water diversion tank 46 of the water diversion device 16. An inspection hole 40 is formed in the upper part of the outer tub 20, and the inspection hole 40 is exposed to the ground surface. The inspection hole 40 is normally closed by a lid (not shown), but by removing the lid, the inside of the outer tub 20 can be inspected from the ground surface. Allows in and out.

  An overflow pipe 42 is attached to the upper part of the side surface of the outer tub 20. The overflow pipe 42 merges with the discharge pipe 26 outside the outer tank 20, and overflows the treated water in the outer tank 20 when the water level in the rainwater storage tank 14 exceeds the upper limit water level. To flow into.

  Furthermore, a connecting pipe 44 that connects the outer tank 20 and the rainwater storage tank 14 is attached to the lower side of the side surface of the outer tank 20, and the treated water in the outer tank 20 is supplied to the rainwater storage tank via the connection pipe 44. 14.

  Moreover, as the water diverter 16, what was proposed in Japanese Patent Application No. 2008-148550 which the applicant of this application applied previously can be used.

  Specifically, the water diversion device 16 includes a water diversion tank 46 that separates foreign substances from rainwater, and a valve 48 provided in the water diversion tank 46, and is accommodated in the outer tank 20 (FIGS. 1 and 2). reference).

  As shown in FIG. 4, the water divide tank 46 is formed in a bottomed cylindrical shape by a synthetic resin such as vinyl chloride, and the size thereof is appropriately set according to the assumed inflow amount of the first treated water flowing into the water divide tank 46. Is done. As described above, the water intake pipe 28 extending from the tank body 18 of the water intake device 12 is connected to the side surface of the water diversion tank 46. The intake pipe 28 has a height between a guide member 62 and an inclined partition plate 64, which will be described later, from the height position of the top plate 34 of the intake device 12 in order to prevent rainwater from flowing in or the flow rate of rainwater from decreasing. It is lowered to a position and connected in a tangential direction to the water diversion tank 46.

  The water diversion tank 46 is opened in the vertical upward direction, and a top plate 50 is provided in the upper opening. The top plate 50 is formed in a donut plate shape having an opening at the center thereof, and has a cylindrical outer tube portion 52 extending downward from the opening edge. A foreign matter collecting portion 54 formed in a trumpet shape is inserted into the outer cylinder portion 52. The foreign matter collecting part 54 has an inner cylindrical part 56 inserted into the outer cylindrical part 52 and a conical part 58 that expands in a conical shape from the lower end of the inner cylindrical part 56, and has a non-floating surface that floats on the water surface. Collect precipitated foreign matter. A locking portion 60 is formed on the outer surface of the foreign matter collecting portion 54, and the foreign matter collecting portion 54 is fixedly attached to the top plate 50 by joining the locking portion 60 and the top plate 50.

  In addition, a guide member 62 is provided in the upper part of the water diversion tank 46. The guide member 62 is a plate-like body that protrudes obliquely upward from the inner wall surface of the water diversion tank 46, that is, in a direction toward the conical portion 58 of the foreign matter collection unit 54, and is substantially C-shaped along the inner wall surface of the water diversion tank 46. The non-precipitated foreign matter formed and mixed in the first treated water is guided to the foreign matter collecting unit 54.

  Furthermore, an inclined partition plate 64 having a downward inclination from the outer edge toward the center is provided in the lower part of the water diversion tank 46. The inclined partition plate 64 has an opening 66 formed at the center thereof and a plurality of small holes 68 formed around the opening 66, and the precipitated foreign matter precipitated at the bottom of the water diversion tank 46 is directed upward. Keep it from flowing.

  Further, a valve 48 is provided at the bottom of the water diversion tank 46, and the water diversion tank 46 and the discharge pipe 26 are connected via the valve 48. As shown in FIG. 5, the valve 48 includes a valve main body 70 and a plug member 72 inserted into the valve main body 70, and is formed of a synthetic resin such as vinyl chloride. The valve body 70 is formed in a bottomed cylindrical shape, and the upper end opening thereof faces the ground surface. The upper end opening of the valve body 70 is normally closed by a lid (not shown). However, by removing the lid, the plug member 72 described later can be attached and detached, and the inside of the valve body 70 from the ground surface can be removed. Inspection becomes possible. The inner diameter of the valve body 70 is appropriately set according to the size of the water diversion tank 46 and is, for example, 210 mm.

  At the bottom of the valve body 70, a pipe connection portion 74 connected to the discharge pipe 26 is formed, and a tank connection portion 76 connected to the water diversion tank 46 is formed slightly above. Further, a plug receiving portion 78 having a funnel shape is formed inside the valve body 70. The plug member 72 is a member used when blocking the flow of water in the valve body 70 and is detachably attached to the valve body 70. The plug member 72 is formed in a cylindrical shape and has a length extending from the plug receiving portion 78 of the valve body 70 to the vicinity of the ground surface.

  In such a rainwater storage system 10, foreign matters mixed in from rainwater are separated as follows, and treated water from which foreign matters have been removed is supplied to the rainwater storage tank 14.

  First, rainwater that has flowed into the inflow pipe 24 of the water intake device 12 from a gutter on the side of the road, a rainwater tank, or the like flows into the tank body 18 from the inflow pipe 24 in a tangential direction. Then, as shown in FIG. 6, the rainwater that has flowed into the tank body 18 flows down into the tank body 18 and flows into the discharge port 32 as it is, and is discharged from the discharge pipe 26 to the rainwater main pipe or the combined sewer pipe. .

  And when the inflow amount of the rainwater from the inflow pipe 24 to the tank main body 18 exceeds the flow-down capability of the discharge pipe 26, the water level in the tank main body 18 will rise gradually. Then, as shown in FIG. 7, the rainwater flowing into the tank body 18 spirally flows inside the tank body 18 while forming a vortex, and as a result, the foreign matter mixed in the rainwater is separated by the vortex. The first treated water from which the foreign matter has been removed is taken out from the intake pipe 28. Specifically, the precipitated foreign matter having a specific gravity greater than that of water such as sand and gravel is collected near the center of the tank body 18 and settles at the bottom of the tank body 18 and is always discharged from the discharge pipe 26 as it is. In addition, non-precipitated foreign matter having a specific gravity smaller than that of water, such as fallen leaves, scatters to the side surface of the tank body 18 due to the centrifugal force of the vortex, floats on the water surface, and stays in the upper part of the tank body 18.

  When the inflow of rainwater from the inflow pipe 24 to the tank body 18 is completed, the water (residual water) remaining in the tank body 18 gradually flows into the discharge port 32 together with precipitated foreign matter and non-precipitated foreign matter as shown in FIG. The water is discharged from the discharge pipe 26 to a rainwater main or a combined sewer pipe.

  The first treated water taken out from the water intake pipe 28 flows into the water diversion tank 46 of the water diversion device 16 in the tangential direction. As shown in FIG. 9, the 1st treated water which flowed into the diversion tank 46 flows down spirally inside the diversion tank 46 while forming a vortex, and as a result, is mixed into the 1st treated water by the vortex. The second treated water from which foreign matters have been separated and foreign matters have been removed overflows from the gap between the outer tube portion 52 and the inner tube portion 56 to the outside of the water diversion tank 46. Specifically, the precipitated foreign matter mixed in the first treated water settles at the bottom of the water separation tank 46 through the opening 66 of the inclined partition plate 64 and the non-precipitated foreign matter mixed in the first treated water. Floats up and stays inside the foreign matter collecting part 54 or below the top plate 50 and outside the outer cylinder part 52. Then, the second treated water overflowing to the outside of the water separation tank 46 is received by the outer tank 20, flows into the connection pipe 44 from the outer tank 20, and is supplied to the rainwater storage tank 14.

  When the inflow of the first treated water from the water intake pipe 28 to the water diversion tank 46 is completed, the separated foreign matter and the water (residual water) that has not overflowed to the outside of the water diversion tank 46 are present in the water diversion tank 46. Remains. Thereafter, when the plug member 72 is removed from the valve body 70 and the valve 48 is opened, foreign matter is discharged into the discharge pipe 26 together with the residual water in the water diversion tank 46, and is discharged to the rainwater main pipe or the combined sewer pipe. The

  Thus, according to this embodiment, it is possible to take out only the treated water from which foreign matter has been removed by the water intake device 12 and supply the treated water to the rainwater storage tank 16. For this reason, the operation | work which removes the foreign material in the rainwater storage tank 14 using a suction hose etc. is unnecessary. Therefore, the maintenance burden of the rainwater storage tank 14 can be reduced.

  Further, according to this embodiment, the water intake port 36 of the water intake pipe 28 for taking out the treated water in the tank body 18 is located at a lower position than the inflow port 30 and higher than the discharge port 32. Is done. Here, when the supply path (inlet) and the discharge path (water intake) are provided at substantially the same height as in the vortex-type solid-liquid separation device of Patent Document 2, non-sediment that floats on the water surface. Material (non-precipitated foreign matter) flows out into the discharge channel together with the treated water. However, in this embodiment, the water intake port 36 is positioned lower than the inlet port 30 and higher than the outlet port 32, and therefore flows into the tank body 18 from the inlet pipe 24. Precipitated foreign matter settles on the bottom of the tank body 18 and flows into the discharge port 32, and even if non-precipitated foreign matter floats on the water surface, it does not flow into the water intake port 36.

  Furthermore, the rainwater flowing into the inflow pipe 24 at the beginning of the rain contains a lot of foreign matters such as gravel, dust, and fallen leaves. According to this water intake device 12, the rainwater containing these initial inflow foreign matter is discharged as it is. 32 and can be discharged from the discharge pipe 26. For this reason, most foreign matters can be removed before the foreign matter is separated from the rainwater by the vortex generated in the tank body 18.

  Furthermore, according to this embodiment, the inflow pipe 24 is connected to the tank body 18 in a tangential direction, and the water intake 36 is disposed at the center of the tank body 18. For this reason, the rainwater that has flowed into the tank body 18 flows spirally inside the tank body 18 while forming an appropriate vortex without hindering the water intake 36 (the intake pipe 28), and the vortex flows into the rainwater. It is possible to separate contaminated foreign matter. Here, as in the vortex-type solid-liquid separation device of Patent Document 2, if a discharge path (water intake) is provided on the side of the cylindrical water tank, for example, centrifugal force caused by vortex flows is a non-sedimentable substance (non-sinkable). When it is applied to (precipitate foreign matter), the non-precipitated foreign matter is scattered to the side of the cylindrical water tank and flows out of the discharge passage together with water. However, according to this embodiment, since the water intake 36 is disposed at the central portion of the tank body 18, the non-precipitated foreign matter flows into the water intake 36 even if the centrifugal force due to the vortex is applied to the non-precipitated foreign matter. There is nothing. Therefore, it is possible to appropriately separate non-precipitated foreign matter mixed in rainwater.

  Further, in this embodiment, the intake pipe 28 is extended into the tank body 18, and the lower end thereof opens downward as the intake port 36. For this reason, the non-precipitated foreign matter floating on the water surface can be retained in the upper portion of the tank body 18 without flowing into the intake pipe 28 from the intake port 36. Further, since the water intake port 28 is opened downward, even if the inflow of rainwater from the inflow pipe 24 to the tank body 18 is finished and the water level in the tank body 18 is lowered, the non-precipitated foreign matter remains in the residual water. At the same time, it does not flow into the water intake 36. Therefore, it is possible to more appropriately separate the non-precipitated foreign matter mixed in the rainwater.

  Furthermore, in this embodiment, the tank body 18 has an inclined bottom surface 22 that is inclined downward toward the center thereof, and a discharge port 32 is disposed at the lower end of the inclined bottom surface 22. For this reason, the precipitated foreign matter that has settled at the bottom of the tank body 18 is smoothly guided to the discharge port 32, and the precipitated foreign matter is appropriately discharged from the discharge pipe 26.

  Furthermore, in this embodiment, the water intake device 12 and the rainwater storage tank 14 are connected via the water diversion device 16, and the treated water (first treated water) taken out by the water intake device 12 is supplied to the water diversion device 16. The treated water (second treated water) that has been introduced and further removed of foreign matters by the water diverter 16 is supplied to the rainwater storage tank 14. For this reason, even if there is a foreign matter that could not be removed by the water intake device 12, the foreign matter can be separated and removed by the water diverter 16. Therefore, it is possible to improve the maintainability of the rainwater storage system 10 as a whole.

  In a rainwater storage system 10 according to another embodiment of the present invention shown in FIG. 10, a water intake device 12 and a rainwater storage tank 14 are connected without passing through a water diversion device 16, and the processing taken out by the water intake device 12. Water (first treated water) is supplied to the rainwater storage tank 14 as it is. Hereinafter, detailed description of the same parts as the rainwater storage system 10 in the embodiment of FIG. 1 will be omitted.

  As shown in FIG. 10, the water intake device 12 includes a tank body 18 that separates foreign substances from rainwater and an outer tank 20 that houses the tank body 18, and is buried in the ground near the rainwater storage tank 14. Is done. The intake pipe 28 is formed in a substantially inverted U shape, and one end of the intake pipe 28 is opened inside the tank body 18 as a water intake 36, and the other side end is opened outside the tank body 18. In such a rainwater storage system 10, the treated water taken out from the water intake 36 to the intake pipe 28 is received by the outer tank 20, flows into the connection pipe 44 from the outer tank 20, and is supplied to the rainwater storage tank 14. The

  According to this embodiment, the outer tub 20 that accommodates the water intake device 12 can be reduced in size. For this reason, the range which must excavate the ground becomes narrow, and even if it is a limited space, the rainwater storage system 10 can be constructed.

  In each of the above-described embodiments, the inclined bottom surface 22 is inclined downward toward the center portion of the tank body 18. However, the present invention is not limited to this, and the inclined bottom surface 22 faces at least the discharge port 32. If it is inclined downward, the precipitated foreign matter deposited on the bottom of the tank body 18 can be guided to the discharge port 32. Moreover, as shown in FIG. 11, it is not necessary to incline the bottom face of the tank body 18, and the bottom face of the tank body 18 may be formed in a flat shape. In this case, the foreign matter that could not flow into the discharge port 32 together with the residual water is swept into the discharge port 32 by rainwater that has flowed into the tank body 18 during the next rainfall.

  Further, in each of the above-described embodiments, the inflow pipe 24 is connected to the tank body 18 in a tangential direction. However, the present invention is not limited to this, and at least the central axis of the inflow pipe 24 is connected to the tank body 18. If the connection is made in a state of being eccentric at a predetermined angle with respect to the radial direction, rainwater will flow eccentrically into the tank body 18 and a vortex will be generated in the tank body 18.

  Although not shown, it is not always necessary to provide the inlet 30 on the side surface of the tank body 18. The inlet body 24 extends into the tank body 18, and its end portion serves as the inlet 30. It may be opened in a state of being decentered at a predetermined angle with respect to the radial direction of the tank body 18.

  Furthermore, as shown in FIG. 12, it is not always necessary to connect the central axis of the inflow pipe 24 in a state of being decentered at a predetermined angle with respect to the radial direction of the tank body 18. 24 may be connected.

  Furthermore, in each of the above-described embodiments, the water intake pipe 28 is extended into the tank body 18 by inserting the water intake pipe 28 through the central portion of the top plate 34, and the water intake 36 is directed downward. However, the present invention is not limited to this. As shown in FIG. 13, by inserting the intake pipe 28 into the side surface of the tank body 18, the intake pipe 28 can be extended into the tank body 18, and the intake port 36 can be opened downward. .

  In each of the above-described embodiments, the tank body 18 is made of synthetic resin. However, the tank body 18 is not limited to this, and the tank body 18 may be made of resin concrete, precast concrete, or the like. For example, the tank body 18 may be formed of a metal such as stainless steel.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

It is an illustration figure which shows the rainwater storage system of one Example of this invention. It is a top view which shows the rainwater storage system of FIG. It is an illustration figure which shows the water intake apparatus of FIG. It is an illustration figure which shows the water diversion tank of the water diversion apparatus of FIG. It is an illustration figure which shows the valve | bulb of the water dividing apparatus of FIG. It is an illustration figure which shows a mode that rainwater flowed into the water intake apparatus of FIG. It is an illustration figure which shows a mode that rainwater flowed into the water intake apparatus of FIG. It is an illustration figure which shows a mode that rainwater flowed into the water intake apparatus of FIG. It is an illustration figure which shows a mode that rainwater flowed into the water diversion apparatus of FIG. It is an illustration figure which shows the rainwater storage system of another Example of this invention. It is an illustration figure which shows the deformation | transformation Example of a water intake apparatus. It is an illustration figure which shows the deformation | transformation Example of a water intake apparatus. It is an illustration figure which shows the deformation | transformation Example of a water intake apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rainwater storage system 12 ... Intake device 14 ... Rainwater storage tank 16 ... Divider 18 ... Tank main body 20 ... Inclined bottom surface 24 ... Inflow pipe 26 ... Drain pipe 28 ... Intake pipe 30 ... Inlet 32 ... Outlet 36 ... Intake water mouth

Claims (7)

A water intake device that separates foreign matter mixed in from rainwater flowing in, takes out water from which foreign matter has been removed, and supplies it to a rainwater storage tank,
The tank body formed in a bottomed cylindrical shape,
An inflow pipe for allowing rainwater to flow into the tank body through an inlet provided in the tank body;
A discharge pipe for discharging foreign matter in the tank body through a discharge port provided lower than the inlet, and water through a water intake port lower than the inlet and higher than the discharge port. A water intake device having a water intake pipe to be taken out. The inlet is provided on a side surface of the tank body,
The discharge port is provided on the bottom surface of the tank body,
The water intake device according to claim 1, wherein the water intake is provided at a position lower than a bottom of the inflow pipe in the tank body.   The water intake device according to claim 1 or 2, wherein a central axis of the inflow port is decentered at a predetermined angle with respect to a radial direction of the tank body, and the water intake is disposed at a central portion of the tank body.   The water intake device according to any one of claims 1 to 3, wherein the water intake pipe is extended into the tank body, and the water intake port is opened downward. The tank body has an inclined bottom surface that is inclined downward toward the discharge port,
The water intake device according to any one of claims 1 to 4, wherein the discharge port is disposed at a lower end portion of the inclined bottom surface.   A rainwater storage system comprising: the water intake device according to any one of claims 1 to 5; and a rainwater storage tank for storing water extracted from the intake pipe.   A vortex diversion device is further provided for separating foreign matter by causing a vortex in the inflowing water and diverting the water from which the foreign matter has been removed. The rainwater storage system according to claim 6, wherein

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