JP2009074285A - Rainwater feed piping structure for rainwater storage and permeating facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater feed piping structure for a rainwater storage and permeating facility which allows rainwater to smoothly flow into the rainwater storage and permeating facility, and prevents an oil content from flowing into the facility to a possible extent. <P>SOLUTION: The rainwater feed piping structure functions to feed rainwater flowing in a water storage pit into the rainwater storage and permeating facility embedded in the ground, and is formed of a first pipe line, a coarse filter device, and a second pipe line. The first pipe line has an inlet which opens horizontally or downward at a vertical intermediate location of the water storage pit for rainwater stored in the water storage pit, and once rises upward from the inlet and then lowers toward an outlet arranged at a location lower than the inlet. The coarse filter device receives the rainwater discharged from the outlet of the first pipeline, and filters coarse contaminants in the rainwater. The second pipe line leads the rainwater filtered by the coarse filter device and removed in the coarse contaminants to the rainwater storage and permeating facility. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rainwater supply piping structure to a rainwater storage and penetration facility in a rainwater penetration system.

In the urban area, as shown in FIG. 7, rainwater 200 that has fallen on the road 100 flows into a catchment or a gutter 300 provided along the road, and from the catchment 400 to an underground drain pipe. In many cases, it flows into a sewer or a river through a drainage channel 500 such as the above.
However, if rainwater flows directly into the river in this way, there is almost no inflow of water into the groundwater veins, which may lead to groundwater depletion.
In addition, due to global warming, there has been a lot of rainfall at the same time, and there are frequent accidents in which rainwater overflows from the ditch and drainage path of the road due to sudden inflow of rainwater and floods the house. In some cases, deaths were caused by flooding in the basement.

Therefore, even in urban areas where paving has progressed, rainwater storage and infiltration facilities such as infiltration dredges and infiltration trenches are used in order to prevent rainwater that has fallen on the road to penetrate into the ground and prevent drainage of groundwater (see Patent Document 1). ) In the rainwater drainage route.
That is, the seepage trough is provided with a permeation hole on the side surface or bottom surface of the reed so that a part of the rainwater flowing into the reed penetrates the rainwater from the permeation hole into the ground. On the other hand, infiltration trenches are filled with crushed stones in excavated grooves, and perforated pipes (permeable pipes) connected to normal pits are installed in the pits. Rainwater that has flowed into the perforated pipe from the ridge is permeated into the ground through a hole provided on the wall of the perforated pipe or a water-permeable sheet wound around the perforated pipe.

By the way, when it rains on the road, oil such as automobile oil spilled on the road surface and coarse garbage such as paper scraps and fallen leaves are washed away by rainwater and flow into the gutters and gutters. When the liquid flows into the permeation trough or the permeation trench, the permeation hole is blocked and the permeation cannot be performed sufficiently.
Therefore, a filter is installed in front of the infiltration trough or infiltration trench to remove dust, but the oil etc. cannot be sufficiently removed, and it is easy to clog the filter or water permeable sheet by adhering to the filter or water permeable sheet. There's a problem.
On the other hand, when a filter that can completely remove oil and the like is provided, there is a problem that it takes a long time to filter rainwater and cannot cope with a large amount of rainfall at one time.
Furthermore, in the case of local heavy rain that exceeds the standard rainfall that has been increasing in recent years, there is a problem that flooding damage may occur because temporary rain cannot be quickly stored in the rainwater storage and penetration facility.

JP-A-8-53873

  In view of the above circumstances, the present invention provides a rainwater supply piping structure to a rainwater storage and penetration facility that allows rainwater to smoothly flow into the rainwater storage and penetration facility and to suppress the inflow of oil to the rainwater storage and penetration facility as much as possible. The purpose is to do.

  In order to achieve the above object, the rainwater supply piping structure according to claim 1 of the present invention (hereinafter referred to as “piping structure according to claim 1”) is constructed such that rainwater flowing into a reservoir is buried in the ground. A rainwater supply piping structure for supplying to a rainwater storage and infiltration facility, having an inlet for rainwater collected in a reservoir that opens horizontally or downward at an intermediate position in the vertical direction of the reservoir, and upward from the inlet. A first pipe line provided so as to descend toward the outlet after standing up, and a coarse filtration device that receives rainwater discharged from the outlet of the first pipe and filters coarse impurities in the rainwater; And a second conduit for guiding the rainwater filtered with the coarse filtration apparatus and having removed coarse impurities to the rainwater storage and penetration facility.

  The rainwater supply piping structure according to claim 2 of the present invention (hereinafter referred to as “piping structure of claim 2”) is the piping structure according to claim 1, wherein the inlet of the first pipe line is located higher than the outlet. It is characterized by being provided.

  The rainwater supply piping structure according to claim 3 of the present invention (hereinafter referred to as “piping structure of claim 3”) is the piping structure according to claim 1 or 2, wherein the filtration surface of the coarse filtration device is rainwater. It is characterized by being provided at a position higher than the top full water level of the storage and infiltration facility.

The rainwater supply piping structure according to claim 4 of the present invention (hereinafter referred to as “piping structure of claim 4”) is the piping structure according to any one of claims 1 to 3, wherein the coarse filtration device is It is characterized by a self-cleaning function for washing out impurities on the filtration surface to the outside of the coarse filtration device by rainwater discharged from the outlet of one pipeline.
Although it does not specifically limit as a coarse filtration apparatus provided with the self-cleaning function which wash | cleans the foreign material on a filtration surface outside the coarse filtration apparatus with the rainwater of the piping structure of Claim 4, For example, it is a commercial name made from German INTEWA company brand hydro jump filter Can be used.

  The rainwater supply pipe structure according to claim 5 of the present invention (hereinafter referred to as “pipe structure of claim 5”) is the pipe structure according to claim 4, wherein the coarse filtration device stores the washing water of the filtration surface into the reservoir. It is characterized by having a discharge path for discharging outside.

  The rainwater supply pipe structure according to claim 6 of the present invention (hereinafter referred to as “pipe structure of claim 6”) is the pipe structure according to any one of claims 1 to 5, and is provided in the second pipe line. It features a replaceable gravel separation filter.

  The rainwater supply pipe structure according to claim 7 of the present invention (hereinafter referred to as “pipe structure of claim 7”) is the pipe structure according to any one of claims 1 to 6, wherein the second pipe line is It is characterized by having a gravel puddle portion that protrudes downward from a portion adjacent to the intermediate portion and has a lid that can be opened and closed at the lower end.

As described above, the piping structure according to claim 1 of the present invention has an inlet for rainwater accumulated in a reservoir that opens horizontally or downward at an intermediate position in the vertical direction of the reservoir, and upward from the inlet. A first pipeline that is provided so as to descend toward the outlet after rising up, and a coarse filtration device that receives rainwater discharged from the outlet of the first pipeline and filters coarse impurities in the rainwater; In addition, since it is configured to include a second pipe that guides the rainwater that has been removed by coarse impurities filtered by the coarse filtration device to the rainwater storage and penetration facility, the inflow of rainwater to the rainwater storage and penetration facility can be smoothly performed. In addition to being able to do this, the inflow of oil into the rainwater storage and penetration facility can be minimized.
That is, rainwater first flows into the reservoir and accumulates in the reservoir, but when the rainwater level in the reservoir becomes higher than the highest point of the first pipe, the rainwater in the reservoir is discharged from the inlet of the first pipe. After removing the coarse impurities with a coarse filtration device, the rainwater with coarse impurities removed is sent to the rainwater storage and infiltration facility through the second pipe and infiltrated into the ground from the rainwater storage and infiltration facility. Can be made. In addition, since the entrance of the first pipeline is located in the middle of the reservoir, it does not suck up sediment such as gravel accumulated at the bottom of the reservoir, and the oil that has flowed into the reservoir along with rainwater Therefore, it hardly enters the first pipe line.

  In the piping structure according to the second aspect of the present invention, since the inlet of the first pipe is provided at a position higher than the outlet, the first pipe acts as a siphon, and the rough water is quickly roughly filtered from the reservoir. It can be sent to the device, preventing rainwater from overflowing from the reservoir even during heavy rain. In addition, even when the inflow of rainwater into the reservoir is stopped, the rainwater in the reservoir can be sent to the rainwater storage and penetration facility until it reaches the entrance level of the first pipeline.

  In the pipe structure according to claim 3 of the present invention, since the filtration surface of the coarse filtration device is provided at a position higher than the full water level of the rainwater storage and infiltration facility, the rainwater after removal of coarse impurities filtered by the coarse filtration device is provided. Can be sent to the rainwater storage and infiltration facility with just a head.

  In the pipe structure according to claim 4 of the present invention, the coarse filtration device has a self-cleaning function for washing out impurities on the filtration surface to the outside of the coarse filtration device by rainwater discharged from the outlet of the first pipeline. Maintenance is almost unnecessary.

  In the pipe structure according to claim 5 of the present invention, the coarse filtration device is provided with a discharge path for discharging the washing water of the filtration surface to the outside of the water storage tank, so that the impurities removed from the filtration surface can be efficiently removed and disposed. can do.

  Since the piping structure of claim 6 of the present invention is provided with a replaceable gravel separation filter in the second pipe, it can remove gravel that could not be removed by the coarse filtration device, and the gravel within the rainwater storage and infiltration facility. Can be prevented from flowing in. Therefore, maintenance of the rainwater storage and penetration facility is facilitated.

  In the pipe structure according to claim 7 of the present invention, the second pipe line is provided with a gravel puddle portion having a lid projecting downward from a portion adjacent to the intermediate portion and having a lid that can be opened and closed at the lower end. In addition, the gravel that has flowed into the second pipe line can be stored in the gravel pool and the gravel can be prevented from flowing into the rainwater storage and penetration facility. And if the lid is opened, the gravel accumulated in the gravel pool can be easily removed from the gravel pool.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 and 2 show one embodiment of a rainwater storage and infiltration system having a rainwater supply piping structure according to the present invention.

As shown in FIGS. 1 and 2, the rainwater supply pipe 1 includes a first pipeline 2, a coarse filtration device 3, and a second pipeline 4.
The first pipe line 2 faces the entire interior of a water storage tank 5a formed by partitioning an existing water collection tank 5 into which rainwater from a side groove P provided along the road L flows through a partition wall 51. The inlet 21 faces an intermediate position from the bottom to the upper end of the reservoir 5a so that the opening faces downward, and after rising up from the inlet 21 once, the outlet 22 It has a substantially inverted U shape that descends toward the bottom.

  The outlet 22 has a lower height than the inlet 21 and is connected to an inflow portion 31 of the coarse filtration device 3 described later.

The coarse filtration device 3 is a product name hydro jump filter manufactured by INTEWA, Germany. As shown in FIG. 3, the coarse filtration device 3 includes an inflow portion 31, a main body portion 32, a filtered water discharge portion 33, and an overflow water discharge portion 34. The inflow part 31 and the main-body part 32 are provided so that the inside of a water reservoir may be faced.
The inflow portion 31 has a cylindrical shape and is connected to the outlet 22 of the first pipeline 2.

The main body portion 32 is connected to the inflow portion 31 and includes a recess 32 a that is recessed downward from the inflow portion 31.
The concave portion 32a has a substantially trapezoidal cross section with inclined surfaces 32b and 32c on the inflow portion 31 side and an overflow water discharge portion 34 side described later, and the inclined surface 32b on the inflow portion 31 side is formed of a mesh material. It is a coarse filter.

The filtered water discharge portion 33 extends in a cylindrical shape from the lower end of the main body portion 32 so as to face the inclined surface 32b from below.
One end of the second pipeline 4 is connected to the lower end of the filtrate discharge part 33.

  The overflow water discharge part 34 is connected to the main body part 32 so as to face the inflow part 31, has a cylindrical shape with a check valve 34 a at the end part on the main body part 32 side, and has a partition wall 51. A discharge port 22 is opened in a drainage basin 5b that is provided adjacent to the water storage basin 5a.

  That is, as shown in FIG. 3 (a), when the amount of rainwater 6 flowing from the inflow portion 31 is small, the coarse filtration device 3 is filtered by the inclined surface 32b and is a filtration surface. The contaminants 7 remain on the inclined surface 32 b, and the rainwater 61 (hereinafter referred to as “filtered water”) 61 from which contaminants have been removed flows into the second pipeline 4. On the other hand, when the amount of the rainwater 6 is large, as shown in FIG. 3B, a part of the rainwater flowing from the inflow portion 31 is filtered by the filter body 32 d, and the filtered water 61 is passed to the second pipe 4. The remaining portion flows over the inclined surface 32c on the overflow water discharge portion 34 side, passes through the check valve 34a, enters the overflow water discharge portion 34, and is drained to the drainage basin 5b. Moreover, the foreign substance 7 stored on the inclined surface 32b is washed away from the inclined surface 32b by rainwater flowing into the overflow water discharge portion 34 side, and enters the drainage basin 5b through the overflow water discharge portion 34 together with rainwater. In addition, since the check valve 34a is provided at the inlet of the overflow water discharge part 34, the rainwater and the impurities 7 once entering the overflow water discharge part 34 do not flow back to the main body part 32 side. .

The second pipe line 4 includes a vertical pipe part 41, a gravel pool part 42, and a horizontal pipe part 43.
The vertical pipe portion 41 has an upper end connected to the filtered water discharge portion 33, a horizontal pipe portion 43 connected to the lower end, and a gravel puddle portion 42 protruding vertically downward from the lower end. ing.

Moreover, although not shown in figure, the removable gravel filter is incorporated above the horizontal pipe part connection part of the standing pipe part 41. As shown in FIG.
The gravel puddle portion 42 has a lid 42a that can be freely opened and closed at the lower end, and by opening the lid 42a, the gravel accumulated inside can be discharged into the reservoir 5a.

The horizontal pipe portion 43 is substantially L-shaped, and the downstream end portion penetrates the wall surface of the water reservoir 5a and faces the water storage space S at the lower end portion of the rainwater storage and penetration facility 8 described later. That is, the filtered water 61 that has flowed into the second pipeline 4 is supplied to the rainwater storage and infiltration facility 8.
Further, the bent portion of the horizontal tube portion 43 is provided with a cleaning port 43a having a lid 43b that can be opened and closed so as to be aligned with a portion parallel to the downstream side groove P.

  As shown in FIGS. 1, 2, and 4, the rainwater storage and infiltration facility 8 has a width of about 100 mm to 300 mm, includes a water storage space S therein, and has a width around which a permeable sheet 8 b is wound. Is formed by embedding a buried base material 8a having a water storage space S along the side groove P. Further, the full water position of the embedded base material 8 a is lower than the filter body 32 d of the coarse filtration device 3.

The embedded substrate 8a is formed by assembling two members 81 and 82 formed of polypropylene resin, polyethylene resin or the like, as shown in FIGS.
That is, one member 81 includes a bottom portion 81a, a vertical surface portion 81b that rises at a right angle from one end of the bottom portion 81a, and a large number of conical trapezoidal protrusions 81c that extend in a direction parallel to the bottom portion 81a from the vertical surface portion 81b. It has. In the vertical surface portion 81b, a water passage hole 81d is formed at a position shifted from the protrusion 81c.

The other member 82 is substantially the same size as the vertical surface portion 81b, and includes a vertical surface portion 82a and a plurality of spacing holding projections 82b having a truncated cone shape on one surface of the vertical surface portion 82a.
As shown in FIG. 4, the embedded base material 8a has the lower end of the member 82 received from the bottom 81a of the member 81 from below, and the spacing holding projections 81c and 82c of both the members 81 and 82 are the other. It is obtained by assembling so as to contact the vertical surface portions 82a and 81b of both members 82 and 81.

The rainwater supply pipe 1 and the rainwater storage and penetration facility 8 are constructed as follows.
That is, first, the ground 9 along or directly below the side groove P is excavated by using a small hydraulic excavator (for example, a trade name Mini Yumbo) or the like, and is slightly wider than the embedded base material 8a and more than the height of the embedded base material 8a. After forming a narrow groove 91 (shown by a broken line in FIG. 4) for embedding a deep base material, filter sand 92 is laid on the bottom of the groove 91 to a thickness of about 50 mm so that the upper surface is substantially horizontal, The water collecting basin 5 is partitioned by the partition wall 51 so as to form the basin 5a and the drainage basin 5b.

Next, the rainwater supply pipe 1 was piped using pipes, elbows, sockets, and the coarse filtration device 3 formed of vinyl chloride resin, polyethylene resin, polypropylene resin or the like, and the water permeable sheet 8b was wound. The embedded base material 8a is set in the groove 91 so that the vertical surface portion 82a where the water holes 81d are not formed is on the road L side, and the downstream end portion of the second pipe 4 is the length of the embedded base material 8a. It is set as the state inserted in the lower end part of the water storage space S of the embedded base material 8a from the one end surface of a length direction. Moreover, although not shown in figure, a ventilation pipe is attached to the embedding base material 8a so that a lower end may face the inside of the water storage space S of the embedding base material 8a, and an upper end may be exposed on the ground.
Subsequently, after the filter sand 92 is filled in the gaps between the vertical surface portions 81b and 82a and the groove 91 to almost the same level as the upper end surface of the embedded base material 8a, the soil is backfilled on the embedded base material 8a and the filter sand 92. . At this time, only the lower portion of the bottom surface portion 81a may be backfilled with the filter sand 92, and the side surface portion and the upper portion may be backfilled with the excavation residual soil.

Since the rainwater supply pipe 1 includes the coarse filtration device 3 as described above, the contaminants 7 that flow into the reservoir 5a together with rainwater do not flow into the rainwater storage and penetration facility 8. Moreover, since the coarse filtration apparatus 3 is equipped with the self-cleaning function in which the foreign substance 7 stored in the filtration surface by the rainwater which flows in from the inflow part 31 in large quantities is discharged | emitted by the drainage basin 5b side, the maintenance of the coarse filtration apparatus 3 is carried out. Almost unnecessary.
And since the exit 22 of the 1st pipe line 2 is lower than the inlet 21, the rain water in the reservoir 5a is quickly roughened by the siphon phenomenon when rain water fills the 1st pipe line 2. It is sent to the filtration device 3 and supplied to the rainwater storage and infiltration facility 8 through the second pipeline 4. Moreover, even if rain rises and the inflow of rainwater into the reservoir 5a stops, the rainwater in the reservoir 5a is drained from the reservoir 5a to the coarse filter 3 until the inlet 21 is above the water surface.

  In addition, since the inlet of the first pipeline 2 is open horizontally or downward, even if there is an oil layer on the surface of the rainwater stored in the reservoir, it almost flows into the first pipeline 2. There is no. Therefore, the gravel filter and the rainwater storage and penetration facility 8 are hardly contaminated by the oil that flows into the reservoir 5a together with the rainwater. The oil remaining in the reservoir 5a may be periodically adsorbed and removed by an oil adsorbing sheet (mat) or the like.

  Further, since the second pipe 4 has a gravel filter built in the vertical pipe portion 41, the gravel that has flowed into the second pipe 4 together with rainwater cannot be filtered by the coarse filtration device 3 and enters the rainwater storage and infiltration facility 8. It can be prevented from flowing in. Moreover, since the gravel accumulation part 42 is provided so that it may protrude below from the lower end of the standing pipe part 41, the gravel which could not be removed with the gravel filter accumulated in this gravel accumulation part 42, and the gravel became rainwater storage penetration | infiltration facility 8 Can be prevented from flowing into. Moreover, since the lid | cover 42a which can be opened and closed freely is provided in the lower end of the gravel puddle part 42, the gravel stored in the gravel puddle part 42 can be easily discharged | emitted in the reservoir 5a by opening the cover 42a. That is, maintenance is easy.

  Moreover, since the 2nd pipe line 4 is equipped with the cleaning port 43a, even if gravel etc. flow into the water storage space S, the cover 43b of the cleaning port 43a is removed, and the 2nd pipe line 4 is connected from the cleaning port 43a. If the hose or the like is inserted up to the water storage space S of the rainwater storage and penetration facility 8, the water storage space S can be cleaned.

  On the other hand, since the rainwater storage and penetration facility 8 is formed by embedding a narrow base material 8a having a width of about 100 mm to 300 mm along the side groove P of the road L, the construction is easy. Construction cost can be reduced. Further, since rainwater that has flowed into the water storage space S penetrates into the soil from the surface opposite to the road L, the soil under the road L is not eroded by the penetration of rainwater.

The rainwater supply piping structure according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the rainwater storage and penetration facility is provided along the side groove of the road, but it may be provided in the site of a general house.
In the above embodiment, the rainwater storage and penetration facility is formed by burying a resin-made buried base material, but a penetration trench that has been used conventionally may be used.

In the above embodiment, the reservoir and drainage basin are formed by partitioning the existing catchment basin, but the reservoir may be separately embedded.
In the embodiment described above, the cleaning port is provided in the second pipeline, but it may be omitted.

In the above embodiment, the gravel pool portion is provided at the lower end of the vertical pipe portion, but may be provided in the middle of the horizontal pipe portion.
In the above embodiment, the first pipeline of the rainwater supply pipe and the coarse filtration device are provided so as to face the reservoir, but if the inlet of the first pipeline is in the reservoir, the rainwater supply The other part of the piping may be provided outside the reservoir.

  In the above embodiment, the penetration is performed only from one side of the embedded base material, but it may be performed from both sides. Furthermore, in the above embodiment, the embedded base material is composed of two members. However, as shown in FIG. 6, the two vertical surface portions 84 and 85 are rotated with respect to the bottom portion 86 via the resin hinge. You may make it use the embedding base material 8b which was integrally molded freely. Moreover, you may be comprised with one shaping | molding member.

1 is a plan view showing one embodiment of a rainwater infiltration system including a rainwater supply pipe structure according to the present invention. It is a figure showing the rainwater supply piping part of the rainwater infiltration system of FIG. It is sectional drawing of the coarse filtration apparatus of the rainwater supply piping of FIG. 2, The figure (a) shows the state in which the rainwater is flowing gently, The figure (b) shows the state in which rainwater is flowing in rapidly. Appears. It is sectional drawing of the rainwater storage penetration facility part of the rainwater penetration system of FIG. It is sectional drawing of the decomposition | disassembly state of the embedding base material of the rainwater osmosis | permeation system of FIG. It is a figure explaining the other aspect of an embedding base material. It is a figure explaining an example of the flow of the rainwater which fell on the conventional road.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rainwater supply piping 2 1st pipe line 21 Inlet 22 Outlet 3 Coarse filtration apparatus 34 Overflow water discharge part (discharge path)
4 Second pipe 42 Gravel puddle 42a Lid 5a Reservoir 6 Rainwater 61 Rainwater 7 from which impurities have been removed 7 Waste 8 Rainwater storage and infiltration facilities

Claims (7)

A rainwater supply piping structure for supplying rainwater flowing into a reservoir to a rainwater storage and penetration facility buried underground, and accumulated in a reservoir that opens horizontally or downward at an intermediate position in the vertical direction of the reservoir. A first pipe having a rainwater inlet, which is provided so as to rise once upward from the inlet and then descend toward the outlet;
A coarse filtration device that receives rainwater discharged from the outlet of the first pipe and filters coarse impurities in the rainwater, and the rainwater that has been removed by the coarse impurities filtered by the coarse filtration device is stored in the rainwater storage and infiltration facility. A rainwater supply piping structure comprising: a second conduit for guiding water to the water.   The rainwater supply piping structure according to claim 1, wherein the inlet of the first pipeline is provided at a position higher than the outlet.   The rainwater supply piping structure according to claim 1 or 2, wherein a filtration surface of the coarse filtration device is provided at a position higher than a full water level of the rainwater storage and penetration facility.   The rainwater supply pipe according to any one of claims 1 to 3, wherein the coarse filtration device has a self-cleaning function for washing out impurities on the filtration surface to the outside of the coarse filtration device by rainwater discharged from the outlet of the first pipeline. Construction.   The rainwater supply piping structure according to claim 4, wherein the coarse filtration device includes a discharge path for discharging rainwater from which impurities on the filtration surface are washed out to the outside of the storage tank.   The rainwater supply piping structure according to any one of claims 1 to 5, further comprising a replaceable gravel separation filter in the second pipeline.   The rainwater supply piping structure according to any one of claims 1 to 6, wherein the second pipe line includes a gravel pool part that protrudes downward from a part adjacent to the intermediate part and has a lid that can be opened and closed at a lower end.

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