JP2013167057A - Rainwater disposal facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater disposal facility A1 which includes a side drain 10, and an infiltration tank 20 provided on the lower part side of the side drain 10 for temporarily storing rainwater flowing in the side drain, and covered with a water permeable sheet, and in which solid matters and suspension matters in the rainwater can be almost completely prevented from flowing into the infiltration tank 20.SOLUTION: The rainwater disposal facility A1 further includes a catch basin 30 for collecting rainwater flowing in a side drain 10. The catch basin 30 has an opening 34 at an upper part position of a side wall 32 thereof so that the rainwater collected in the catch basin 30 flows from the opening 34 into an infiltration tank 20.

Description

  The present invention relates to a rainwater treatment facility that can prevent rainwater from being flooded onto a road or the like by temporarily storing rainwater during raining or the like.

  In order to treat rainwater that accumulates on roadways, parking lots, grounds, etc., gutters are installed at the ends of roads. Also known is a rainwater treatment facility that not only guides rainwater flowing into the ditches into the river, but also allows the rainwater to penetrate into the ground near the ditches. In addition, there is described a rainwater treatment facility that uses a side groove with a permeation pipe in which a permeation pipe having a plurality of permeation holes in a peripheral wall is arranged in a vertical direction in the ground. In Patent Document 2, a permeation tank covered with a water permeable sheet is installed on the lower side of the side groove, and rainwater flowing through the side groove through the water perforation formed in the bottom of the side groove is caused to flow into the permeation tank to temporarily store water. In addition, a rainwater treatment facility is described in which a permeation pipe having a plurality of holes formed therein is provided in the lower part of the permeation tank.

  In addition, many permeation tanks used in rainwater treatment facilities have been proposed. In Patent Document 3, a large number of resin members are assembled to form a permeation tank body, and the whole is water-permeable like a nonwoven fabric. A permeation tank covered with a sheet is described.

JP 2006-118265 A JP 2009-127359 A JP 2009-24447 A

  The rainwater treatment facility described in Patent Document 2 has an infiltration tank as described in Patent Document 3 on the lower side of the gutter, and infiltrates a large amount of rainwater when a temporary torrential rain occurs. The rainwater can be appropriately treated by accommodating it in the tank. However, rainwater is in a form that flows directly into the infiltration tank from the water-permeable hole formed in the bottom of the side groove, and there is a risk that solids such as earth and sand may enter the infiltration tank. Even if a relatively large solid can be captured by attaching a filter to the water permeable hole, it is not easy to completely prevent the solid from entering.

  In particular, in a rainwater treatment facility using a permeation tank in which a large number of resin members are assembled to form a permeation tank main body and covered with a water-permeable sheet such as a nonwoven fabric as described in Patent Document 3, the permeation tank Water storage space, that is, each water storage space formed by laminated resin members is narrow, so if earth and sand or suspended matter enters the infiltration tank, the work to remove it (maintenance work) is In addition to being extremely difficult, the water-permeable sheet covering the periphery is clogged, and the ability of rainwater to flow out of the permeation tank, that is, the permeation ability is reduced. For this reason, in rainwater treatment facilities, it is a major technical problem to prevent soil and sand in rainwater from entering the infiltration tank.

  The present invention has been made in view of the above circumstances, and is covered with a lateral groove and a water-permeable sheet that is provided on the lower side of the lateral groove and can temporarily store rainwater flowing through the lateral groove. In a rainwater treatment facility equipped with at least a permeation tank, it is an object to be able to almost completely prevent solids and suspensions in rainwater from flowing into the permeation tank.

  In order to solve the above problems, a rainwater treatment facility according to the present invention includes a side groove and a permeation covered with a water permeable sheet that is provided at a lower side of the side groove and can temporarily store rainwater flowing through the side groove. A rainwater treatment facility comprising at least a tank, further comprising a catchment for collecting rainwater flowing through the gutter, the catchment having an opening at an upper position of a side wall thereof, and collecting in the catchment The drained rainwater is made to flow into the permeation tank from the opening.

  In the rainwater treatment facility according to the present invention, the rainwater flowing through the gutter is once collected in the catchment, and only the rainwater that has passed through the opening formed in the upper position of the side wall of the catchment is installed in the lower part of the gutter. It flows into the infiltration tank. That is, the rainwater that flows into the infiltration tank is only rainwater after sediment or suspended solids such as earth and sand is suspended at the bottom of the catchment basin, that is, the supernatant liquid, and solids such as earth and sand are in the infiltration tank. And the suspension can be surely avoided.

  Therefore, in the rainwater treatment facility according to the present invention, as a permeation tank, for example, as described in Patent Document 3, a large number of resin members are assembled to form a permeation tank body, and the whole is water-permeable like a nonwoven fabric. Even if an infiltration tank covered with a sheet is used, it is possible to avoid the formation of a sediment layer due to sediment or suspended matter in the infiltration tank over a long period of time, which can reduce maintenance work for the infiltration tank. It becomes possible. As a result, clogging of the water-permeable sheet covering the permeation tank can be avoided over a long period of time, and even in rainwater treatment facilities where maintenance is not performed or difficult to perform, It is possible to avoid over a long period of time that rainwater penetrates into the surrounding ground from the tank, that is, the permeation ability is lowered.

  In a preferred embodiment of the rainwater treatment facility according to the present invention, a filter material is attached to an opening formed at an upper position of the side wall of the water collecting basin. In this embodiment, the filter material can remove solids or suspensions having a smaller particle diameter, so that the maintenance work for the permeation tank can be further reduced. When attaching the filter material, it is more preferable to attach it in a replaceable manner. Moreover, as a material of a filter material, materials, such as a nonwoven fabric, a woven fabric, and a mesh, can be illustrated.

  In a preferred embodiment of the rainwater treatment facility according to the present invention, the water collecting tank is a seepage tank. In particular, it is preferable to use a seepage trough made of permeable concrete having no bottom as a water catching trough. In this aspect, since only rainwater exceeding the capacity of the catchment tank that functions as a seepage tank flows into the seepage tank, it is possible to control the outflow of a larger amount of rainwater, and maintenance work for the seepage tank Can be further reduced.

  In a preferred embodiment of the rainwater treatment facility according to the present invention, the permeation tank includes a permeation pipe having a plurality of holes formed in the lower part or the periphery thereof. In this aspect, since rainwater permeates into the ground from the surface of the permeation pipe in addition to the entire surface of the permeation tank, the outflow suppression process for a large amount of rainwater can be more reliably performed.

  In the rainwater treatment facility according to the present invention, a form in which all of the rainwater flowing through the gutter flows into the catchment can be used. Moreover, the form used for the catchment basin provided with the overflow dam, and only the rain water which got over the overflow dam flows into the catchment basin may be sufficient. In the latter case, the rainwater flowing in the gutters when the rainfall is low flows down the gutters and flows into the river or sewer pipe, and only when there is more rainfall than the design value, the excess rainwater overflows. It gets over the flow weir and flows into the infiltration tank. In this aspect, since rainwater does not flow into the infiltration tank except when there is a lot of rainfall, maintenance work for the infiltration tank can be further reduced. Examples of the shape of the overflow weir include a U-shaped cross-section with an open top and an L-shaped cross-section with the bottom connected to the side wall of the water collecting basin.

  According to the present invention, in a rainwater treatment facility comprising at least a side groove and a permeation tank that is provided on the lower side of the side groove and is covered with a water permeable sheet capable of temporarily storing rainwater flowing through the side groove. It is possible to almost completely prevent solids and suspensions in rainwater from flowing into the permeation tank. As a result, maintenance work for the infiltration tank can be reduced, and the ability of rainwater to infiltrate from the infiltration tank into the surrounding ground can be prevented from decreasing.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows 1st Embodiment of the rainwater treatment facility by this invention in a cross section. The top view of the rainwater treatment facility shown in FIG. Sectional drawing which follows the aa line of FIG. Sectional drawing which follows the bb line of FIG. It is the schematic which shows 2nd Embodiment of the rainwater treatment facility by this invention in a cross section, Fig.5 (a) is sectional drawing equivalent to FIG. 1, FIG.5 (b) is a top view equivalent to FIG. Sectional drawing which follows the bb line of Fig.5 (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the first embodiment of the rainwater treatment facility according to the present invention shown in FIGS. 1 to 4, the rainwater treatment facility A <b> 1 includes a side groove 10, a permeation tank 20 installed at a lower portion of the side groove 10, and a water collecting tank 30. Prepare. The side groove 10 is provided along the road, for example, and is formed by connecting a plurality of concrete U-shaped side grooves 11. A concrete floor slab 12 wider than the side groove 10 is provided on the bottom surface side of the side groove 10, and a mortar layer 13 is formed between the concrete floor slab 12 and the bottom surface of the side groove 10.

  The infiltration tank 20 is installed so as to cover almost the entire surface of the concrete floor slab 12 at a position below the concrete floor slab 12. In this example, as shown in FIG. 3, the permeation tank 20 includes a permeation tank main body 22 formed in a rectangular parallelepiped shape by assembling a large number of resin members 21 as described in Patent Document 3, for example, and the periphery thereof. The crushed stone layer 23 is surrounded by a water-permeable sheet 24 such as a nonwoven fabric that surrounds the entire outer peripheral surface of the crushed stone layer 23. Although not shown, the entire permeation tank body 22 may be covered with a similar water-permeable sheet, whereby the entire permeation tank body 22 is stabilized. Further, in this example, an appropriate number of permeation pipes 25 each having a plurality of through holes formed on the wall surface are erected on the bottom surface of the permeation tank 20 in the vertical direction.

  The catchment basin 30 is installed so as to be in contact with the end face side of the side groove 10 in the flow path direction. In this example, the water collecting basin 30 is made of permeable concrete, and is a cylindrical body having a rectangular cross section as a whole, and does not have a bottom surface and a top surface. The upper surface position of the water collecting basin 30 and the upper surface position of the side groove 10 are substantially equal to each other, that is, the height of the ground surface. Moreover, although the lower end position of the water collecting tank 30 is made into the substantially same position as the bottom face position of the osmosis tank main body 22 which comprises the osmosis tank 20 in this example, you may extend further below. A lid 31 is detachably attached to the top surface of the water collecting bowl 30 in a screen shape.

  Two openings 33 and 34 are formed in the side wall 32 of the water collecting tank 30 and in contact with the side groove 10 and the end face of the permeation tank 20. The first opening 33 is formed at an upper position of the side wall 32 and at a position where the side wall 32 faces the end face of the side groove 10. The second opening 34 is also the upper position of the side wall 32 and faces the portion located on the upper surface side of the permeation tank body 22 in the crushed stone layer 23 constituting the permeation tank 20, as shown in FIG. It is formed in the position to do. In addition, a filter material 35 made of a material such as a nonwoven fabric, a woven fabric, or a mesh is detachably attached to the second opening 34, although it can be omitted.

  The action at the time of water collection of the rainwater treatment facility A1 will be described. Rainwater flowing through the side groove 10 flows into the catchment basin 30 from the first opening 33 formed in the side wall 32 of the catchment basin 30. The rainwater that has flowed in penetrates into the ground from the open bottom of the water collecting basin 30. Moreover, it permeates into the ground from the surrounding side walls which are permeable concrete. When an amount of rainwater that cannot be treated by the catchment basin 30 flows into the catchment basin 30, the rainwater level in the catchment basin 30 gradually increases. When the water level reaches the level of the second opening 34 described above, rainwater flows into the infiltration tank 20 through the second opening 34. Thereby, it is possible to prevent rainwater from flowing out from the gutter 10 and the water collecting basin 30 to the road surface or the like.

  Rainwater that has flowed into the catchment basin 30 temporarily stays in the catchment basin 30 before it flows into the infiltration tank 20. Meanwhile, solids such as earth and sand and suspended matter contained in the rainwater are deposited on the bottom of the catchment basin 30 in the process of rainwater permeating into the ground from the open bottom of the catchment basin 30. Then, the supernatant liquid after the solid matter is precipitated flows into the infiltration tank 20 through the second opening 34. Further, in this example, a filter material 35 is attached to the second opening 34, and finer solid matter floating in the rainwater is also removed by the filter material 35.

  Furthermore, in this example, the second opening 34 is formed so as to face a portion of the crushed stone layer 23 constituting the infiltration tank 20 that is located on the upper surface side of the infiltration tank body 22, and flows into the second opening 34. The rainwater passes through the crushed stone layer 23 and flows into the permeation tank body 22 formed by assembling a large number of the resin members 21 into a rectangular parallelepiped shape. The crushed stone layer 23 has a function as a filter medium, and rainwater is also subjected to a filtering action there.

  From the above, in the rainwater treatment facility according to the present invention, it is possible to suppress the solid matter such as earth and sand and suspension contained in the rainwater flowing through the gutter 10 from entering the infiltration tank body 22 with high probability. It becomes. Therefore, it is possible to greatly reduce the maintenance work of the permeation tank 20, particularly the permeation tank main body 22. Further, as a result, clogging of the water permeable sheet 24 covering the permeation tank 20 or the permeation tank main body 22 can also be avoided over a long period of time, and rainwater treatment is difficult or difficult to perform maintenance. Even in the facility A1, it is possible to avoid the ability of rainwater from penetrating the tank 20 to permeate the surrounding ground, that is, the deterioration of the penetrating capacity over a long period of time.

  In the illustrated example, the concrete floor slab 12 is provided in order to equalize the loading load and avoid the concentrated load from acting on the permeation tank 20, and may be omitted. Moreover, although what comprised the penetration tank main body 22 and the crushed stone layer 23 surrounding the circumference | surroundings as the osmosis tank 20 was demonstrated, all or one part of the crushed stone layer 23 can also be abbreviate | omitted. If the portion of the crushed stone layer 23 located on the upper surface side of the infiltration tank body 22 is omitted, the second opening 34 formed in the side wall 32 of the catchment basin 30 is formed in the upper part of the infiltration tank body 22. It is formed at the opposite position.

  FIG. 5 shows a second embodiment of the rainwater treatment facility according to the present invention. In this rainwater treatment facility A2, as shown in FIG. 5A, the first side wall 41 is different from the side wall 32 where the first opening 33 of the water collecting basin 30 is formed. A third opening 42 is formed at a height position substantially equal to the opening 33. Then, as shown in FIG. 5 (b), a trough member 43 having a U-shaped cross section is arranged in the catchment trough 30 so as to connect the first opening 33 and the third opening 42. As shown well in FIG. 6, the upper end of the side wall 44 of the flange member 43 reaches the vicinity of the upper surface positions of the first opening 33 and the third opening 42. Further, on the outside of the side wall 41 of the water collecting basin 30, a second side groove 10A is disposed so as to be connected to a third opening 42 formed in the side wall 41. In addition, the other structure in rainwater treatment facility A2 may be the same as rainwater treatment facility A1 demonstrated based on FIGS. 1-4, and abbreviate | omits description by attaching | subjecting the same code | symbol to the same member.

  In the rainwater treatment facility A2 according to the second embodiment, when the amount of rainwater flowing through the gutter 10 is small, more precisely, the height of the side wall 44 of the U-shaped trough member 43 attached to the catchment trough 30 is increased. When the rainwater level does not increase, the rainwater flows through the gutter member 43 into the second lateral groove 10A. And it is guide | induced to the river, a sewer pipe, etc. from the 2nd gutter 10A. Therefore, in a normal state, rainwater does not flow into the permeation tank 20 and is maintained in an empty state.

  When the amount of rainwater flowing through the gutter 10 increases due to a large amount of rain or the like, the level of rainwater flowing through the gutter member 43 gradually increases and exceeds the height of the upper edge of the side wall 44. From that point on, the side wall 44 Rainwater overflowing the river flows into the catchment 30. That is, the side wall 44 of the eaves member 43 functions as an overflow dam. The behavior of rainwater after flowing into the catchment basin 30 is the same as that of the rainwater treatment facility A1 according to the first embodiment, and the description thereof is omitted.

  As described above, in this form of rainwater treatment facility A2, rainwater flowing through the side groove 10 when there is little rainfall flows down the side groove 10, the eaves member 43, and the second side groove 10A, and flows into the river or the sewer pipe. Only when there was a rainfall exceeding the design value, an excessive amount of rainwater climbed over the overflow weir formed on the side wall 44 of the dredging member 43 and flowed into the collecting rod 30, It flows into the infiltration tank 20 in accordance with the water level level. That is, in this aspect, since rainwater does not flow into the permeation tank 20 except when there is a lot of rainfall, there is an advantage that the maintenance work of the permeation tank 20 can be further reduced.

  In addition, when the formation position of the first opening 33 and the third opening 42 described above is formed at a position deviated to one of the side walls of the catchment basin 30, the L-shaped cross section is formed. The eaves member may be disposed so as to connect the first opening 33 and the third opening 42 so that one side of the bottom plate is fixed to the side wall of the water collecting eave 30. In that case, the vertical side wall of the eaves member having an L-shaped cross section functions as an overflow weir.

10 ... gutter,
10A ... second gutter,
11 ... U-shaped side gutter made of concrete,
12 ... Concrete floor slab,
20 ... Osmosis tank,
21 ... Resin member forming the permeation tank body,
22 ... The permeation tank body,
23 ... a crushed stone layer constituting an infiltration tank,
24 ... water permeable sheet,
25 ... Osmosis tube,
30 ... Catchment,
31 ... Catchment lid,
32 ... side wall
33 ... 1st opening formed in the side wall (inlet to the rainwater catchment),
34 ... 2nd opening (inlet to the infiltration tank of rainwater) formed in the side wall,
35 ... Filter material attached to the second opening.
42 ... a third opening formed in the side wall,
43 ... U-shaped eaves member,
44: It is a side wall of the eaves member and functions as an overflow dam.

Claims (5)

A rainwater treatment facility comprising at least a side groove and a permeation tank provided on a lower side of the side groove and covered with a water permeable sheet capable of temporarily storing rainwater flowing through the side groove,
The rainwater treatment facility further includes a catchment for collecting rainwater flowing through a gutter, the catchment has an opening at an upper position of a side wall thereof, and the rainwater collected in the catchment is used for the opening. A rainwater treatment facility, wherein the rainwater treatment facility is configured to flow into the permeation tank.   The rainwater treatment facility according to claim 1, wherein a filter material is attached to an opening formed at an upper position of the side wall of the catchment basin.   The rainwater treatment facility according to claim 1 or 2, wherein the water collecting tank is a seepage tank.   The rainwater treatment facility according to any one of claims 1 to 3, wherein the permeation tank includes a permeation pipe having a plurality of holes formed therein.   The rainwater treatment facility according to any one of claims 1 to 4, wherein the catchment basin includes an overflow dam, and only rainwater over the overflow dam flows into the catchment basin.

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