JPH0637110Y2 - Filtration tub for rainwater infiltration basin - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a filter tub arranged inside a rainwater infiltration basin that allows rainwater, miscellaneous drainage, and the like to permeate into the soil.

[Conventional technology]

In recent years, with the improvement of urban areas, the number of bare lands in the city has decreased, and rainfall water, miscellaneous drainage, etc. do not permeate into the soil and often flow directly into rivers and sewers. As a result, the amount of water stored in the soil will be insufficient, and groundwater will be depleted.
In addition, since a large amount of water flows into the sewage treatment plant via the sewer, the treatment capacity of the sewage treatment plant may be temporarily exceeded during heavy rain, etc., and some of the sewage may be discharged untreated. It will be unavoidable.

In order to overcome these drawbacks, methods have been developed to infiltrate rainwater and gray water into the soil. For example, opening a large number of permeation holes in the drainage pipe that connects the rainwater basin and the sewer pipe,
Rainwater and miscellaneous drainage penetrate into the soil through this hole. However, according to this method, mud, sand, etc.
The permeation hole provided in the drainage pipe is easily clogged with dust or the like.

Therefore, the present inventors have developed a permeation basin in which a filtration member molded from a water-permeable resin concrete is removably incorporated, and this has been developed into Japanese Patent Application No. 59-50747.
Application No. 6). The water-permeable resin concrete that constitutes this filtering member is obtained by coating the surface of an aggregate with a thin film of synthetic resin before solidification, and by bonding the thin films of adjacent aggregates to each other. Therefore, minute continuous voids are formed between the aggregates, and rainwater, miscellaneous drainage, and the like penetrate into the soil through the voids. Then, in order to secure the permeation ability, the filter member is regularly cleaned.

[Problems to be solved by the invention]

Particles such as mud and sand with a fine particle size are often suspended in rainwater and gray water. When such running water permeates the soil through the water-permeable resin concrete, fine particles adhere to the surface of the aggregate forming a fine continuous space. It is difficult to remove the fine particles adhered / accumulated inside the filter member even if it is regularly cleaned, and the water permeability of the filter member cannot be restored to the initial state. Therefore, it is necessary to replace the filtration member itself after repeated use by washing several times. In addition, a special cleaning tool is required to remove the adhered / accumulated fine particles.

Therefore, the present invention employs a structure in which a filter medium is dispersed in individual particles to facilitate cleaning of the clogging filter medium and to maintain excellent water permeability for a long period of time. The purpose is to provide a filter trough.

[Means for solving problems]

In order to achieve the object, the rainwater infiltration basin filter tub of the present invention allows a pellet material having a diameter larger than that of the slits to be freely inserted into and taken out from a gap formed by an outer frame and an inner frame having a large number of slits. The filter material is characterized by

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a part of the filter trough of this embodiment, and the filter trough 5 has a double structure of an inner frame 12 and an outer frame 13.

FIG. 2 shows the outer frame 13 in a side cross-sectional view. The outer frame 13 has an upper portion on the inner peripheral surface, and a protruding portion 19 abutting on the outer periphery of the side wall of the inner frame 12.
Are formed at equal intervals, and the bolt insertion holes 20 through which the bolts 17 connecting the inner frame 12 and the outer frame 13 are inserted are formed by the protrusions 19.
Is perforated. Further, if the protruding portion 19 is vertically long as shown in the drawing, the outer frame 13 is also reinforced. A large number of slits 21 extending in the vertical direction are formed in the side wall of the outer frame 13, and rainwater and the like flowing into the filter trough 5 flow out through the slits 21. The width of the slit 21 depends on the grain size of the pellet material 23 that fills the gap and constitutes the filter medium 16, but is usually about 2 to 3 mm.

As shown in FIG. 1, the inner frame 12 is provided with legs 14 in an appropriate shape on the lower surface of the bottom body, and a plurality of protrusions 15 are provided on the outer circumference of the upper side wall at equal intervals in the circumferential direction. Has been. The inner frame
When 12 is fitted to the outer frame 13, the leg portions 14 and the protruding portions 15 contact the bottom plate and the side wall of the outer frame 13, and the protruding portion 19 of the outer frame 13 contacts the side wall of the inner frame 12, A predetermined gap is formed between them. Pellet material 23 such as polypropylene is freely inserted into and taken out of this gap and the filter material 16
Make up. In this state, bolt 17 to inner frame 12 and outer frame 13
The inner frame 12 by inserting the
And the outer frame 13 are integrally fixed. Incidentally, a slit of about 2 to 3 mm is formed on the side wall of the inner frame 12 similarly to the outer frame 13, and as the pellet material 23 constituting the filter medium 16,
It is preferable to use a granular material having a particle size of about 4 to 5 mm.

FIG. 3 is a cutaway view of the right half of a rainwater infiltration basin incorporating the filtration basin 5 having such a structure.

In this rainwater infiltration basin 1, a bottom plate 8 is arranged below a lower frame member 2, an upper frame member 7 is arranged above the lower frame member 2, and a lid receiving frame member 6 is further arranged above the lower frame member 2. A grid-shaped lid 3 is arranged on the open upper surface of 6. Inside the rainwater infiltration basin 1, a filter tray 4 is arranged in the upper part, and a filter tub 5 in which a pellet material 23 is freely filled in and out to form a filter material 16 is arranged in the lower part.

The upper frame member 7 has a plurality of shoulder-like ridges 7a extending from the lower end to the middle of the height on its inner surface, and a plurality of small holes are formed on the shoulder-like ridges 7a. Is placed.

The lower frame member 2 is provided with a plurality of water passage holes 9 in the lower portion of the side wall, a relatively large thin portion 11 is provided in the upper portion of the side wall, and the thin portion 11 is perforated as necessary to provide a large number of drainage pipes. The permeation pipe (not shown) provided with the permeation hole is connected. Further, in the center of the bottom plate 8, there is an opening 10 smaller than the filtration tub 5.
Is provided, and the filter trough 5 is placed on the opening 10.

In addition, 5a is a handle to be gripped when the filter trough 5 is taken out from the rainwater permeation trough 1.

FIG. 4 is a plan view showing the lid body 3 arranged on the open upper surface of the lid receiving frame portion 6 by partially cutting it off. In each of the parts obtained by dividing the lid body 3 into four equal parts, water passages 22 inclined at an angle of 45 degrees are provided substantially in parallel to a diamond shape surrounding the central portion of the lid body 3.
By arranging in such a manner and narrowing the width of each water passage groove 22, the passage of a bicycle or the like passing over the lid body 3 is prevented from being obstructed.

When rainwater, miscellaneous drainage, and the like flow into the rainwater infiltration basin 1 described above, relatively large debris such as leaves that are floating in the running water are separated from the running water in the water flow groove 22. Then, the running water
After the small suspended particles are removed when passing through the filtration tray 4, the fine particles are removed when passing through the filtration tub 5. The running water after the suspended matter is removed in this manner is used as the lower frame member 2
Permeate into the soil through the water passage hole 9 and the opening 10 of the bottom plate 8.

When the rainwater infiltration basin 1 is used for a long time in this state, the pellet material 23 of the filter material 16 is formed by freely filling and removing the pellet material 23 between the outer frame 13 and the inner frame 12 of the filter tub 5. Fine particles are accumulated in the gaps, and the water permeability of the filtration trough 5 is reduced. Therefore, in order to restore the water permeability of the filter trough 5, the filter trough 5 is taken out from the rainwater infiltration trough 1, and the filter trough 5 is vibrated while being immersed in the accumulated water. In this way, the filter medium 16
Is composed of individual pellet materials 23 that are independent from each other, so that the fine particles that are individually vibrated and deposited in the gaps between the plurality of pellet materials 23 are easily removed. Also, loosen the bolts 17 of the filter tub 5 taken out from the rainwater infiltration basin 1 to move the outer frame 13 to the inner frame.
When 12 is separated and washing water is sprayed on the surface of the taken out filter medium 16, the filter medium 16 composed of a plurality of pellets 23 is formed.
Disperses quickly, resulting in an even better cleaning effect.

Then, the washed pellet material 23 is assembled to the outer frame 13 after the inner frame 12 is assembled, and then the gap between the outer frame 13 and the inner frame 12 is refilled to form the filter medium 16, thereby improving the initial water permeability. The filter tub 5 can be restored to the state of having it.

[Effect of device]

As described above, in the present invention, the filtration trough arranged in the rainwater infiltration trough has a double structure of an outer frame and an inner frame,
The filter medium is constructed by filling the space between the outer frame and the inner frame so that the pellet material can be freely taken in and out. When the water permeability of the filter tub is reduced due to the adhesion and accumulation of fine particles such as mud and sand in the spaces between the plurality of pellets, the filter tub is removed from the rainwater infiltration basin and the individual pellets are washed. Therefore, the pellet material constituting the filter medium can be easily washed and the washing effect is excellent. Therefore, by regularly washing, the capacity of the filter trough can be always restored to the initial state, and the rain trough infiltration trough filter trough which can be used for a long period of time can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a filter tub according to an embodiment of the present invention, FIG. 2 shows an outer frame of the filter tub, FIG. 3 shows a rainwater infiltration tub incorporating the filter tub, and FIG. The figure shows the lid that covers the top of the rainwater infiltration basin. 1: Rainwater infiltration basin, 2: Lower frame member 12: Inner frame, 13: Outer frame 16: Filter material, 21: Slit 23: Pellet material

Claims (1)

[Scope of utility model registration request] 1. A rainwater permeation characterized in that a filter medium is constructed by filling a gap formed by an outer frame and an inner frame having a large number of slits so that a pellet material having a diameter larger than that of the slits can be freely taken in and out. Filter tub for basins.