JPS6235732Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a filter suitable for use in a rainwater underground infiltration device.

Recently, rainwater underground infiltration devices have been proposed in order to prevent urban flood damage caused by rainwater and to prevent a drop in groundwater level. This rainwater underground infiltration device guides rainwater introduced into an underground rainwater basin from, for example, a road gutter to a rainwater infiltration part such as a seepage pipe covered by an underground infiltration layer, and directs this rainwater through the underground infiltration layer. It is possible to penetrate and diffuse into the soil.

Here, the rainwater that flows into the underground rainwater basin from the ground surface contains suspended substances such as wood chips and vinyl that are difficult to capture by mud puddles in the rainwater basin, and these suspended substances permeate. There is a risk of clogging pipes, etc. In addition, rainwater may contain impurities that have a negative impact on living organisms, such as acids such as hydrochloric acid, fungi such as E. coli, and heavy metals.
If these are allowed to penetrate and diffuse into the underground percolation layer along with rainwater, there is a risk of contaminating the groundwater.

Therefore, in order to avoid the above-mentioned suspended solids and impurities contained in rainwater from flowing into the underground percolation layer, it is conceivable to place a filter in the water conduit pipe leading from the rainwater basin to the rainwater permeation section.

The purpose of this invention is to provide a filter that effectively utilizes the entire filtering material loaded in the filter, stably removes suspended solids and impurities in rainwater over a relatively long period of time, and ensures proper underground infiltration of rainwater.

In order to achieve the above object, the filter 30 according to the present invention is provided with an upper filter tank part 30A and a lower tank part 30B in which the filter media 49 and 61 are loaded with an interval in the vertical direction. The filter tank part 30A,
An outer cylindrical part 35 that has an outflow port on the peripheral wall that allows filtered rainwater to flow out, and an inner cylindrical part 37 that has an inlet that is inserted into the outer cylindrical part 35 at intervals and that allows the rainwater to flow in the peripheral wall. The introduction part 30C that guides the rainwater flowing around the upper filter tank part 30A to the lower filter tank part 30B is connected to the upper filter tank part 30.
It is formed between A and the lower tank part 30B. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rainwater underground infiltration device to which an embodiment of the present invention is applied, in which a road gutter 12 is installed on the ground surface 11, and a rainwater basin 13 is installed below the gutter 12. A seepage pipe 15 constituting a rainwater infiltration section is connected to the rainwater basin 13 via a water conduit 14 serving as a water conduit in the present invention. The permeation pipe 15 is covered by an underground permeation layer 16 .

A lid 19 having a through hole 18 opening into the side gutter 12 is attached to the upper opening 17 of the rainwater basin 13. The bottom of the rainwater basin 13 is designated as a mud basin 20.
A drain port 21 is formed in the side wall. A garbage removal inlet filter 22 is removably installed in the upper opening 17 of the rainwater basin 13, and a drain outlet 21 is provided with a garbage removal inlet filter 22.
A dust removal drain filter 23 is provided.

The introduction pipe 14 includes a water intake pipe 24 and a filter storage pipe 25.
It is a vertical pipe having a water intake port 2 of the water intake pipe 24.
6 is connected to a drain port 21 of a rainwater basin 13. The upper end of the introduction pipe 14 opens to the ground surface 11, and the opening 27 can be closed with a lid 28.

The permeation tube 15 is provided with a large number of through holes 29 in its peripheral wall that open to its inner and outer surfaces.

Here, in the case of the rainwater underground infiltration device, the filter housing pipe 25 of the introduction pipe 14 is equipped with a filter 30 as shown in FIGS. 2 to 4. Filter 3
0, as described later, in each part of its longitudinal direction,
Upper filter tank part 30A, lower tank part 30B, introduction part 30C
have.

The filter 30 has a string 31 connected to the lid 28.
is connected to a handle 33 attached to the upper ring 32, and can be attached and detached by suspending it from the ground surface into the introduction pipe 14 and lifting it up. A flange sealing member 34 made of rubber or the like is provided on the outer circumference of the upper ring 32 of the filter 30, and the filter 30 fluid-tightly locks this sealing member 34 to the upper end of the filter storage pipe 25. By doing so, it can be held in the filter housing tube 25.

The upper ring 32 of the filter 30 has an upper filter tank part 3.
0A, the lowering tank part 30B, and the introduction part 30C, a net-like container body 35 made of a wire mesh, a synthetic resin net, etc., which allows rainwater to flow in and out, is connected to a nonwoven fabric 36, which will be described later, as well as a riveted structure. It hangs attached by 32A.

The upper end or middle part of the container body 35 forms the outer cylinder part of the upper filter tank part 30A in the present invention, and its peripheral wall is provided with a large number of outflow ports through which filtered rainwater can flow out. A wavy nonwoven fabric 36 extends on the inner surface of the container body 35 forming the outer cylinder. A sufficient gap is formed between the inner surface of the filter housing pipe 25 and the outer surface of the container body 35 to allow filtered rainwater to flow smoothly.

Inside the outer cylindrical portion made of the vessel body 35 and the nonwoven fabric 36, a bottomed inner tube 37 forming the inner cylindrical portion of the upper filter tank portion 30A of the present invention is arranged coaxially at intervals in the radial direction. is inserted into. That is, the inner tube 37 is inserted from the upper end of the container body 35 to the middle part in the axial direction, and forms a filtration space 38 having a substantially U-shaped longitudinal section between the inner tube 37 and the container body 35 . The upper end of the inner tube 37 has a flap-shaped opening 39, and the peripheral edge of the flap-shaped opening 39 can be held on the inner peripheral part of the upper ring 32. The inner pipe 37 has a perforated shape, and is provided with a large number of holes 40 on its peripheral wall and bottom as inlets through which rainwater to be filtered can flow. A wavy nonwoven fabric 41 is laid on the outer surface of the inner tube 37 facing the filtration space 38 side.

A core rod 4 is provided at the center of the bottom of the bottomed inner tube 37.
The upper end of 2 is a nut 43 that is screwed onto the core rod 42.
A, 43B. Core rod 42
Along the center of the container body 35, the lower tank part 30B
It extends to the bottom of the. Nuts 44A, 44 screwed onto the core rod 42 are provided in the middle part of the core rod 42.
A bottom plate 45 of the upper filter tank section 30A is fixed by B. A large number of holes 46 are formed in the bottom plate 45 as outlets for filtered rainwater. 47
is an upper middle ring fixed to the bottom plate 45 by bolts 48, and the outer peripheral part of the bottom plate 45 and the upper middle ring 47 sandwich the middle part of the container body 35 and the lower end of the nonwoven fabric 36.

A filter material 49 such as maifan stone is loaded in the filter space 38 of the upper filter tank 30A. Note that filter media 49 are provided at multiple positions in the axial direction on the outer circumference of the container body 35.
A shaping ring 50 that maintains the cylindrical shape of the container body 35 is attached when the container body 35 is loaded.

The lower end of the container body 35 forms the lowering tank part 30B of the present invention, and a filtration space 51 is formed inside. A cylindrical body 52 made of a synthetic resin sheet or the like that does not allow rainwater to permeate is disposed on the inner surface of the container body 35 forming the lowering tank portion 30B. The upper end of the cylindrical body 52 and the vessel body 35 are connected to inner and outer lower intermediate rings 54A, 5 which are fastened by rivets 53.
It is held by 4B. A flange-shaped sealing member 55 made of rubber or the like is provided on the outer periphery of the outer lower intermediate ring 54B.
is capable of being liquid-tightly latched to the lower end of the filter storage pipe 25.

Nuts 56A, 56B are attached to the lower end of the core rod 42.
The bottom plate 57 of the lowering tank part 30B is fixed by. The bottom plate 57 is provided with a number of holes 58 as outlets for filtered rainwater. Reference numeral 59 denotes a lower ring fixed to the bottom plate 57 with bolts 60, and the outer circumference of the bottom plate 57 and the lower ring sandwich the lower ends of the vessel body 35 and the cylinder body 52.

A filtering material 61 such as bagged activated carbon or bagged ion exchange resin is loaded in the filtration space 51 of the lower tank portion 30B.

Furthermore, the part sandwiched between the part forming the upper filter tank part 30A and the part forming the lower filter tank part 30B of the container body 35 is the introduction part 30C in the present invention.
This makes it possible to guide rainwater flowing around the upper filter tank section 30A to the lower filter tank section 30B.

Next, the operation of the above embodiment will be explained.

The rainwater flowing into the rainwater basin 13 from the side gutter 12 is
Dust and the like are removed by an inlet filter 22, collected in a rainwater basin 13, and overflowed from a drain port 21 into a water conduit 24. At this time, the dust and the like that were not removed by the inlet filter 22 are removed by the drain filter 23. Further, the sediment is deposited in the mud basin 20 of the rainwater basin 13. Rainwater flowing into the water pipe 14 enters the filter 30.

Rainwater entering the upper filter tank 30A of the filter 30 passes through the holes 40 of the inner pipe 37 and the nonwoven fabric 41, where fine particles such as tire friction particles are separated and removed, and then enters the filter medium 49. Rainwater purified by, for example, maifan stone constituting the filter material 49 is filtered through the non-woven fabric 3.
6 and flows out from the container body 35 and the hole 46 of the bottom plate 45.

Here, in the above embodiment, the upper filter tank section 30
A defines a filtration space 38 having a substantially U-shaped vertical cross section between an outer cylinder made of the container body 35 and an inner tube 37 coaxially inserted into the container body 35. Therefore, at the initial stage of use of the upper filter tank section 30A, rainwater flowing into the inner pipe 37 flows through the inner pipe 37.
After flowing into the filtration space 38 from the hole 40 located at a lower level inside the filtration space 38 and being filtered through the filtration path as shown by A in FIG.
It flows out from the hole 46 of the bottom plate 45. Following the progress of the above initial stage, if the filter media 49 etc. located at the lower part of the inside of the filtration space 38 become clogged, the rainwater will flow through the upper filtration path as shown by B in Fig. 2.
It is filtered through the filter medium 49, etc., which is not yet clogged. In this way, as the filter media 49, etc. located further down inside the filtration space 38 gradually become clogged, the filtration path gradually shifts upward as shown in A to C in FIG. This enables stable filtration using an active filter material 49 or the like.

Next, the rainwater flowing out from the upper filtration tank section 30A via the above-mentioned filtration route A directly flows into the filtration space 51 of the lower filtration tank section 30B, and flows out from the upper filtration tank section 30A via the above-mentioned filtration routes B and C. Due to the existence of the sealing member 55 that is secured to the lower end of the filter storage pipe 25, the rainwater that has been collected is routed as shown by D in FIG.
Filtration space 51 from introduction part 30C to lowering tank part 30B
flows into. The rainwater that has flowed into the bottom tank 30B in this way does not leak out from the outer periphery due to the presence of the cylindrical body 52, and is further purified by the filter material 61 such as activated carbon or ion exchange resin. 57 and flows into the permeation tube 15. The rainwater that has flowed down into the infiltration pipe 15 flows through its through hole 2.
9, it permeates and diffuses into the underground permeation layer 16.

Note that if the filter media 49, 69 of the upper filter tank section 30A and lower filter tank section 30B become clogged, after raising the filter 30 to the ground surface, remove the nuts 56A,
56B, remove the bottom plate 57 of the lower tank part 30B from the container body by removing the bolts 60, and remove the bottom plate 45 of the upper filter tank part 30A from the container body 35 by removing the nuts 33A, 44B and bolts 48. This allows the filter media 49, 61 to be replaced quickly and easily.

That is, according to the above embodiment, the upper filter tank section 30
As the clogging of the filter material 49 in A moves from the lower level to the upper level, the rainwater
The rainwater always passes through the upper level filtration path where there is no clogging. After being purified by the upper filtration tank section 30A, the rainwater is further purified by the lower filtration tank section 30B. Therefore, the entire filter material 49, 61 is effectively utilized, and suspended solids and impurities dissolved in the rainwater are stably adsorbed and removed over a relatively long period of time.
It will be possible to ensure proper underground infiltration of rainwater.

As described above, in the filter 30 according to the present invention, the upper filter tank part 30A and the lower tank part 30B in which the filter media 49 and 61 are loaded are provided with an interval in the vertical direction, and the upper filter tank part 30A, an outer cylindrical portion 35 having an outflow port on the peripheral wall that allows filtered rainwater to flow out, and an inlet that is inserted into the outer cylindrical portion 35 at intervals and is provided in the peripheral wall to allow rainwater to flow in. An introduction part 30C is formed between the upper filter tank part 30A and the lower tank part 30B to guide rainwater flowing out around the upper filter tank part 30A to the lower tank part 30B. This is how it works. Therefore, by effectively utilizing the filter media 49 and 61 as a whole, suspended substances and impurity substances in rainwater can be stably removed over a relatively long period of time, and proper underground permeation of rainwater can be ensured. is possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a rainwater underground infiltration device to which an embodiment of the present invention is applied, Fig. 2 is a front view showing a filter according to the embodiment with main parts cut away, and Fig. 3
The figure is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a sectional view taken along the - line in FIG. 2. 13...Rainwater basin, 14...Introduction pipe, 15...
Penetration tube, 16... Penetration layer, 30... Filter, 30
A...Upper tank part, 30B...Lower tank part, 30C...
...Introduction part, 35...Vessel body, 37...Inner tube.

Claims (1)

[Scope of utility model registration request] A filter installed in a water conduit that guides rainwater from a rainwater reservoir to a rainwater infiltration section, in which an upper filter tank section and a lower tank section in which a filter material is loaded are provided with an interval in the vertical direction, An outer cylindrical part is provided with an outflow port on the surrounding wall that allows rainwater filtered through the filter tank to flow out, and an inner cylindrical part that is provided with an inlet on the surrounding wall that is inserted at intervals into the outer cylindrical part and allows rainwater to flow in. A filter having a cylindrical part, and an introduction part formed between the upper filter tank part and the lower tank part for guiding rainwater flowing out around the upper filter tank part to the lower tank part.