JP2019027149A - Vertical type rainwater permeation facility - Google Patents

Abstract

To provide a vertical type rainwater permeation facility in which the clogging of a filter body and a permeation hole peripheral wall surface is hardly occurred, and the permeation capacity of the permeation hole peripheral wall surface can be maintained for a long time.SOLUTION: The vertical type rainwater permeation facility comprises: a permeating body 2 installed in a permeation hole A right under a catch basin 1; and a filter body 3 installed in the catch basin 1, penetrating a bottom of the catch basin 1 and communicating with the permeating body 2. The filter body 3 is composed of a filter 14, a filter housing cage 15 inscribed with a filter 14, and a filter protection frame 13. The filter 14 is composed of an upper filter 14a and a top end filter 14c having water permeability, and a lower filter 14b having a lower water permeability than the filters 14a, 14c. A rainwater inflow hole 21 is formed in a peripheral wall of the filter protection frame 13. A large number of rainwater inflow holes 21 are formed in an upper peripheral wall of the filter protection frame 13, and a smaller number of the rainwater inflow holes 21 than the rainwater inflow holes in the upper peripheral wall is formed in a lower peripheral wall.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vertical rainwater infiltration facility that suppresses the amount of rainwater drained into sewers, rivers, etc., mainly by allowing rainwater to infiltrate into the ground in roads, parks, or building sites, and in particular, filter bodies and infiltration holes. The peripheral wall surface is not easily clogged, the permeation ability of the permeation hole peripheral wall surface can be maintained over a long period of time, and maintenance such as laying and cleaning after laying can be easily performed.

  In recent years, inundation damage due to heavy rain has frequently occurred in Japan due to national climate change and urban heat island phenomenon. On the other hand, since the infiltration area necessary to control flood damage caused by heavy rain is decreasing as urbanization progresses, installation of rainwater outflow control facilities to prevent flood damage is required.

  As this type of facility, rainwater is stored in underground spaces such as infiltration trenches and storage infiltration tanks, and it is allowed to permeate the ground over time, thereby reducing the amount of rainwater drainage to sewers and rivers and increasing the water retention capacity of the soil. Rainwater runoff control facilities that improve and recharge groundwater are known.

  For example, Patent Document 1 discloses a drainage filter used in a rainwater infiltration structure in which a bottom portion of a street mast (X) is opened and a permeation pipe (WP) penetrating the opening is disposed in the ground. The invention is disclosed.

  The drainage filter is attached to the upper end of the permeation pipe (WP), and has a cylindrical main body (1) having permeation holes (4) drilled in a plurality of locations on the side wall, and the main body (1). The filter material (2) to be arranged, the filter support portion (3) that is detachably provided to the main body portion (1) while supporting the filter material (2), and a ventilation member that penetrates the filter material (2) ( And 5).

  Then, when rainwater flowing into the street wall (X) reaches a water level that exceeds the upper end of the main body (1) connected to the permeation pipe (WP), the main body (1) ) And drained by the permeation pipe (WP) via the filter material (2).

  In addition, when the level of rainwater flowing into the street wall (X) is lower than the upper end of the main body (1), the filter material (from the penetration hole (4) provided in the side wall of the main body (1) ( It is discharged to the permeation pipe (WP) via 2).

  Patent Document 2 discloses an invention of a rainwater drainage facility comprising a rainwater tank (A) buried under the ground surface in a site and a screw casing (3) installed in the ground immediately below the rainwater tank. Is disclosed.

  The screw casing (3) is a cylindrical container with a closed end and a spiral wall (31) and a plurality of communication holes (h) on the peripheral wall, and the rainwater tank (A) It is installed through the bottom of A), and the upper end is open in the rain gutter (A).

  The screw casing (3) is filled with a large number of crushed stones and filter stones (4I) on the inside and the outer periphery thereof, and the permeation filter (4) is attached to the upper end opening of the screw casing (3).

  In such a configuration, the rainwater flowing into the rainwater trough (A) is a permeation filter (4) attached to the upper end opening of the screw casing (3), and a screw casing (3) filled with a large number of crushed stones (33). ), And is permeated and drained into the ground through the communication hole (h) of the peripheral wall and the filter stone (41).

Japanese Patent No. 4962991 Japanese Patent No. 5411030 Japanese Patent No. 4465029 Japanese Patent Laid-Open No. 10-168985

  However, in the invention of Patent Document 1, particularly when rainwater flowing into the street (X) reaches a water level exceeding the upper end of the main body (1) connected to the permeation pipe (WP), the main body (1) Because it flows into the inside of the main body (1) from the opening on the upper end surface of the body, it is easily clogged by adhering floating substances such as dead leaves and dust, especially in heavy rain, etc. If the part is clogged, rainwater may overflow from the street beam (X) in a short time.

  On the other hand, in the invention of Patent Document 2, the permeation filter (4) is attached to the upper end opening of the screw casing (3) (see Patent Document 2 FIGS. 4 (a) and (b)). ) Is estimated from the figure, but because the entire peripheral wall is formed in a uniform network, it is easily clogged by sediment and suspended solids contained in rainwater, and the infiltration capacity of the ground May be reduced.

  In any of the inventions, since the filter is easily clogged, it is necessary to frequently perform cleaning, and it is estimated that maintenance and management are very troublesome.

  The present invention has been made to solve the above-described problems, and the filter body and the perforation hole peripheral wall are less likely to be clogged, and the permeation ability of the permeation hole peripheral wall can be maintained over a long period of time. An object is to provide a vertical rainwater infiltration facility that can easily perform maintenance such as cleaning and cleaning after laying.

  The present invention comprises a vertical rainwater infiltration facility comprising a filter body into which rainwater flows and a permeation body that is installed in the ground immediately below the filter body and permeates rainwater that flows in from the filter body into the surrounding ground. The filter body includes a columnar filter and a filter storage cage in which the filter is inscribed, the filter includes an upper filter and a lower filter adjacent to each other in the vertical direction, and the upper filter is a lower filter. It is characterized by greater water permeability.

  In general, rainwater at the time of rain becomes turbid due to a large amount of earth and sand and suspended matter, and flows into sewers and water collection facilities with dead leaves and garbage. Sediment has a relatively large specific gravity and tends to settle on the bottom of the water, while suspended substances (here, particulate substances having a diameter of about 2 mm or less) are suspended or suspended in water.

  For this reason, for example, when the water permeability of the entire peripheral wall is uniform as in the filter disclosed in Patent Document 2, if all of the earth and sand and the suspended solids are to be blocked by the filter, the water permeability of the filter is equivalent. Since it is necessary to reduce the size, it is impossible to efficiently infiltrate and drain the rainwater in the ground without overflowing the surroundings.

  On the other hand, if the inflow of rainwater through the filter is increased, it is necessary to increase the water permeability of the filter, so that both earth and sand and suspended solids flow into the ground, resulting in clogging of the perimeter wall of the seepage hole. As a result, the permeation capability of the perimeter wall surface of the permeation hole is reduced within a short period of time.

  According to the present invention, the suspended substance is suspended by configuring the filter of the filter body from two types of filters having different water permeability, an upper filter having a higher water permeability and a lower filter having a lower water permeability than the upper filter. However, relatively clean rainwater flows into the permeate from the upper filter, and substances that have a relatively high specific gravity such as earth and sand and tend to settle on the bottom of the water are blocked by the lower filter with low water permeability, allowing the filter body to pass through. Without impeding the water capacity, it is possible to efficiently infiltrate and drain rainwater during rainfall into the ground.

  Also, dust and dead leaves floating on the surface of the water adhere to the filter body in a floating state, and when the inflow of rainwater stops, the water level drops and falls off the peripheral wall of the filter body. Can do.

  As a result, dead leaves, dirt, earth and sand, etc. are blocked by the filter body, and suspended substances that pass through the filter body without being blocked by the filter body limit the flow path in the permeation body installed in the ground directly under the filter body. The filter body and permeation can be prevented by precipitating and adhering the suspended material to the wall around the permeation hole by precipitating and adhering to the filter medium, permeation pipe, permeation pipe sand-proof coating sheet, and crushed stone layer. Clogging of the peripheral wall surface of the hole can be prevented, and the permeation ability of the peripheral wall surface of the permeation hole can be maintained for a long time.

  Moreover, cleaning and washing can be simplified by installing the filter body and a part of the permeation body so that they can be taken out from the permeation hole, and maintenance and management can be easily performed by reducing the number of cleanings.

  In addition, the height of the filter body is adjusted so that it can be installed at an arbitrary height, so when installing the filter body at the bottom of a water collecting or road gutter, etc. By installing the filter body according to the depth of the road gutter and the height of the drain outlet of the rainwater discharge pipe connected to the drainage can be installed so that the filter body is not completely submerged in the rainwater .

  Furthermore, if there is a possibility that the mud in the collection tank accumulates to a high position due to the location of the filter body or the shape of the collection tank, put the filter in the filter protection frame together with the filter storage basket, In addition, the filter body can be prevented from being buried in the mud by forming the filter body long in the axial direction (vertical direction) according to the height of the mud (rainwater drain pipe bottom height). In addition, when the filter body is buried in mud, not only the water passing ability is lost, but also earth and sand may flow into the infiltrating body.

  The filter is, for example, by winding a water-permeable cloth such as a synthetic fiber nonwoven fabric in a cylindrical roll shape, and winding a water-permeable cloth such as a synthetic fiber nonwoven fabric having a small water permeability around the outer periphery except for a certain range of the upper end portion. It can be easily formed into a filter having a structure having a lower filter with low water permeability at the bottom and an upper filter with high water permeability at the top.

  In addition, by installing the filter in a mesh-shaped filter storage basket made of wire mesh or the like, even if there is a partial shift or breakage due to deterioration over time, the shape of the filter is maintained and the function of the filter can be extended for a long time. Can be maintained.

  In addition, when the filter is put into the filter protection frame together with the filter storage basket to make a filter body, and this is installed at the bottom of a water collecting or road side groove, a plurality of rainwater inflow holes are provided in the peripheral wall of the filter protection frame, In particular, a large number of rainwater inflow holes may be provided in the upper part of the peripheral wall of the filter protection frame, and a small number of rainwater inflow holes may be provided in the lower part of the peripheral wall.

  In addition, by attaching a bone wire made of reinforcing steel or the like to the outer wall of the filter storage basket and the upper end surface, a certain clearance is formed between the filter and the filter protection frame, so that the rainwater inflow hole of the filter protection frame More influent rainwater can be received efficiently on the entire surface of the filter.

  The filter protective frame includes, for example, a cylindrical upper protective frame in which the filter storage basket is inscribed, a lower protective frame in which the lower end portion of the filter is accommodated, and a filter support plate in the lower protective frame that supports the filter, In addition, a plurality of rainwater inflow holes may be provided in the peripheral wall of the upper protective frame, and more rainwater inflow holes may be provided in the upper part of the peripheral wall than in the lower part of the peripheral wall.

  Furthermore, by attaching a protective cap to the upper end of the filter protection frame and providing a plurality of air vents in the protection cap, it is possible to prevent rainwater and air from changing due to rainwater flowing into the filter protection frame at the beginning of rainfall. The generated bubbles can escape to the outside of the filter protection frame, and rainwater can flow smoothly into the filter body.

  The filter body is installed at the bottom of the drainage basin and road gutters, etc., embedded under the ground surface, and connected to the drainage basin such as the drainage basin and osmotic trench pipe via a connecting pipe. Sometimes (see FIGS. 5-7). In this case, the filter may be put in a filter protection frame together with a filter storage basket to form a filter body, and the rainwater inflow hole of the filter protection frame may be connected by a method such as inserting a connecting pipe.

  In addition, the size, quantity, and position of the rainwater inflow holes are not specified, and a plurality of rainwater inflow holes may be provided depending on the position, scale, or quantity of the rainwater drainage facility such as a water collecting basin or a permeation trench pipe. Moreover, it may be provided in steps.

  The penetrating body comprises at least a penetrating pipe installed vertically in the ground directly below the filter body, and a crushed stone layer installed on the outer periphery of the penetrating pipe, the bottom surface of the penetrating pipe is closed, and the lower peripheral wall is What is necessary is just to coat | cover with the osmotic tube sand-proof coating sheet.

  In addition, if a water conduit is installed inside the permeation tube, and if the water conduit is filled with a filter medium, it is possible to suppress the attachment and accumulation of suspended substances on the perimeter wall of the permeation hole. It is possible to prevent the clogging of the permeation hole and maintain the permeation ability of the perimeter wall surface of the permeation hole for a long time.

  In addition, as for the filter medium with which it fills in a water conduit, it is desirable to make it to the same height as an osmosis | permeation pipe sand-proof coating sheet. This is because if the filter medium is filled up to the top of the water conduit, rainwater cannot be smoothly flowed to the bottom surface of the permeation hole. Moreover, if it has installed so that a water conduit can be taken out from the inside of an osmosis | permeation pipe, the inside of a water conduit and an osmosis | permeation pipe can be cleaned easily.

  According to the present invention, in particular, the filter is provided with an upper filter having a high water permeability and a lower filter having a lower water permeability than the upper filter adjacent to each other in the upper and lower sides, so that the suspended water floats but the relatively clean rainwater is in the upper part. While passing through the filter and flowing into the permeate directly under the filter body, substances with relatively high specific gravity, such as earth and sand, that tend to settle on the bottom of the water, are almost blocked by the lower water-permeable lower filter and suspended through the filter body. The material is limited to the flow path in a triple structure including a water conduit, a permeation pipe, a permeation pipe sand-proof coating sheet and a crushed stone layer filled with a filter medium. In addition, it is configured to prevent adhesion and accumulation on the perimeter wall of the permeation hole by precipitating and adhering to the crushed stone layer, thereby maintaining the water passage capacity of the filter body and Penetration capability of penetrating hole wall surface to prevent clogging can be maintained for a long time. Further, since the filter body and the permeation body can be easily cleaned and cleaned, the maintenance and management can be easily performed.

It is one embodiment of the present invention and is a perspective view showing the structure of a vertical rainwater infiltration facility. FIG. 2 illustrates the structure of the filter body and the permeation body of the vertical rainwater permeation facility shown in FIG. 1, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a partially broken side view. It is a disassembled perspective view which shows the structure of a filter support frame, the lower protection frame of a filter protection frame, and a filter body. It is a perspective view of the upper protection frame of a filter protection frame. It is other embodiment of this invention, and is a longitudinal cross-sectional view which shows the structure of the vertical-type rainwater infiltration facility connected to the water collecting basin and the water collecting basin. FIG. 6 illustrates the structure of the filter body and the permeation body of the vertical rainwater permeation facility illustrated in FIG. 5, in which FIG. 6 (a) is a plan view and FIG. 6 (b) is a partially broken side view. FIG. 7 is a perspective view of an upper protection frame of a different type of filter protection frame used in the vertical rainwater infiltration facility illustrated in FIG. 6.

  1 to 4 illustrate an embodiment of a vertical rainwater infiltration facility according to the present invention. In the figure, a water collecting trough 1 is installed under the ground surface, and a permeating body 2 is installed substantially vertically in a permeating hole (vertical hole) A formed in the ground immediately below the water collecting trough 1.

  In addition, a filter body 3 is installed in the water collecting basin 1, and the filter body 3 and the permeating body 2 pass through the opening 1a at the bottom of the water collecting basin 1 and communicate with each other.

  Further, a plurality of storm water inflow pipes 4a and storm water discharge pipes 4b are laid in two or three directions under the ground surface around the water collecting basin 1 and the ends of each pipe 4a, 4b are the side walls of the water collecting basin 1. Connected to the department. The rainwater discharge pipe 4b is connected to a position lower than the rainwater inflow pipe 4a.

  In such a configuration, rainwater flowing into the collecting water 1 through each rainwater inflow pipe 4a flows into the permeation body 2 through the filter body 3, and is permeated and drained from the permeation body 2 into the surrounding ground. . In addition, when the infiltration body 2 and the filter body 3 are filled with rainwater that has flowed in temporarily, the rainwater does not flow into the filter body 3 and is drained to other drainage facilities such as sewers through the rainwater discharge pipe 4b. The

  More specifically, the water collecting basin 1 is formed in a rectangular box shape opened directly above by cast-in-place concrete or precast concrete, and an upper lid (not shown) is detachably attached to the upper end portion.

  In addition, an opening 1a is formed at the center of the bottom of the water collecting tank 1, and the filter body 3 and the permeation body 2 are connected through the opening 1a.

  The permeation body 2 includes a permeation pipe 5 installed almost vertically in a permeation hole A formed in the ground immediately below the collecting water, a water guide pipe 6 installed in the permeation pipe 5 and a lower outer periphery of the permeation pipe 5 And the filter medium 8 filled in the water conduit 6 to the same height as the osmotic pipe sand-proof coating sheet 7, and the outer periphery of the osmotic pipe 5 (the portion having the osmotic pipe sand-proof coating sheet 7). A crushed stone layer 9 having a predetermined thickness. In addition, the depth and diameter of the infiltration body 2 are determined to be the optimum size in consideration of the infiltration capacity of the surrounding ground, the amount of rain during the rain, and the like.

  The osmosis pipe 5 deposits and deposits suspended substances that cannot be removed by the filter medium on the lower part of the osmosis pipe 5 to prevent outflow to the crushed stone layer 9 and the flow rate of rainwater flowing into the osmosis pipe 5 from the water guide pipe 6. The entire peripheral wall of the osmotic tube 5 is formed of a long tube having uniform water permeability over the entire length.

  For the permeation tube 5, for example, a net-like tube having an infinite number of permeation holes (not shown) having an aperture ratio of about 1.2% is used on the entire peripheral wall of the tube, and the lower end portion is closed by a permeation tube bottom cap 10.

  The water guide pipe 6 is formed to have a slightly smaller diameter than the permeation pipe 5 and has a length that reaches substantially the same depth as the permeation pipe 5. Further, a plurality of water guide holes 6 a are formed uniformly at intervals in the pipe axis direction and the pipe circumferential direction in the entire peripheral wall of the water guide pipe 6, and the lower end portion is closed by the water guide pipe bottom cap 11.

  Since the water guide pipe 6 is installed in the permeation pipe 5, rainwater flowing from the filter body 3 can smoothly flow into the bottom surface side of the permeation hole A, and the flow of rainwater flowing from the filter body 3 And the water pressure can be kept constant, and can act perpendicularly to the peripheral wall surface of the permeation hole A.

  The penetrant disclosed in the patent document has a concern that the filler portion is clogged from the GL side by the suspended substance, and rainwater does not flow to the bottom side. In the present invention, the water guide pipe 6 is installed in the permeation pipe 5 although there is also a problem that it spreads laterally at the upper part of the permeation body and flows downward while scouring the peripheral wall surface of the permeation hole A. Thus, there is no concern that is anxious in the patent literature.

  In addition, a hard resin perforated pipe such as a rigid polyvinyl chloride perforated pipe is used for the water guide pipe 6, and the diameter and number of the water guide holes 6a take into account the infiltration capacity of the ground and the amount of water discharged during rainfall. The optimum diameter and quantity are determined.

  The permeation pipe sand-proof coating sheet 7 is a sheet having water permeability that allows clear water to pass through but does not allow suspended substances contained in rainwater to pass therethrough so as to cover the lower peripheral wall of the permeation pipe 5 over a certain length in the tube axis direction. Installed to form a sedimentation space for clogging substances.

  The permeation pipe sand-proof coating sheet 7 is clogged with the passage of time, but the permeation holes formed in the peripheral wall above the upper end of the permeation pipe sand-proof coating sheet 7 of the permeation pipe 5 are located upward from below due to adhesion and accumulation of suspended substances. Therefore, the flow path to the crushed stone layer 9 is not completely blocked in a short period of time. The permeation pipe sandproof covering sheet 7 is made of a nonwoven fabric having a particularly low water permeability, such as a synthetic fiber nonwoven fabric.

  The filter medium 8 functions to slow down the flow rate of rainwater flowing in from the filter body 3 to enhance the sedimentation effect of the suspended solids, and to confine the suspended solids and prevent the rainwater from flowing in later. Have.

  The filter medium 8 is filled in the water conduit 6 to the same height as the permeation pipe sand-proof coating sheet 7. This is because if the filter medium 8 is filled up to the upper part of the water guide pipe 6, rainwater cannot flow smoothly to the bottom surface side of the permeation hole A.

  Further, for example, ceramic, crushed stone, gravel, or the like is used as the filter medium 8, and in particular, a filter medium having a diameter larger than the diameter of the water guide hole 6 a formed in the peripheral wall of the water guide pipe 6 (about 7 mm) is used. . This is because a filter medium having a particle smaller than the diameter of the water guide hole 6a may cause clogging of the water guide hole 6a.

  The crushed stone layer 9 delays the arrival of a very small amount of suspended matter that cannot be removed even in the permeation pipe 5, finally reaching the peripheral wall surface of the permeation hole A. In addition, it has a function to prevent the peripheral wall surface of the permeation hole A from collapsing, and is formed of fine crushed stone of about No. 6 (particle size 5 to 13 mm).

  Under such a configuration, the permeation body 2 has a triple structure including the water guide pipe 6 filled with the filter medium 8 from the inside, the permeation pipe 5, the crushed stone layer 9, and the like. By effectively attaching and precipitating suspended substances flowing into the water guide pipe 6 together with rainwater through the filter medium 8 and the lower part of the permeation pipe 5, adhesion and deposition on the peripheral wall surface of the permeation hole A are prevented. It is possible to suppress the reduction of the permeation capacity of the peripheral wall surface of the permeation hole A at the time of rainwater inflow, and to maintain the permeation capacity of the surrounding ground for a long time.

  In addition, since the penetrator 2 is installed vertically in the depth direction in the ground, it is possible to secure a wide area of rainwater infiltration in a narrow installation space, and using water pressure (water head) Rainwater can be efficiently drained into the ground.

  Furthermore, the water conduit 6 can be lifted and cleaned, the filter medium 8 in the water conduit 6 can be washed and replaced, and clogging substances such as suspended substances settled in the permeation tube 5 In addition, the clogging of the permeation pipe 5 can be easily cleaned with a residual water pump or the like, and the inner peripheral surface of the pipe can be cleaned with a brush or the like (clogging is eliminated), so that maintenance is easy.

  A filter support frame 12 is installed in the opening 1 a at the bottom of the water collecting tank 1, and the filter body 3 is installed inside the upper part of the filter support frame 12.

  The filter support frame 12 is formed in a cylindrical shape that can be inscribed in the opening 1a at the bottom of the fixed length of the upper portion of the water collecting head 1 and is formed in a funnel shape that gradually decreases in diameter toward the lower end from the top. . Further, the filter support frame 12 is basically installed in the opening 1a at the bottom of the water collecting tank 1 so as to be substantially flush with the bottom surface of the water collecting tank 1, and the lower end is connected to the upper end of the permeation pipe 5. .

  The gap between the periphery of the filter support frame 12 and the periphery of the opening 1a is filled with mortar (not shown) for fixing the support frame.

  The filter body 3 includes a filter protection frame 13, a filter 14 and a filter storage basket 15 installed in the filter protection frame 13, and a filter support plate 19 to be described later for placing the filter 14. 13 is formed in a vertically long cylindrical shape from the lower protective frame 16 and the upper protective frame 17.

  The upper protective frame 17 is formed in a cylindrical shape in which the filter storage basket 15 is inscribed, and a protective cap 18 is attached to the upper end portion with an adhesive or the like.

  The lower protective frame 16 is formed in a funnel shape in which the upper portion has a fixed length that is slightly smaller in diameter than the filter support frame 12, and the lower portion from the upper portion gradually decreases in diameter toward the lower end.

  And it installs in the filter support frame 12 in the position about 1 cm lower than the bottom face of the water collection tank 1, and the lower end part is connected to the upper end part of the water conduit 6 so that attachment or detachment is possible.

  In addition, a filter support plate 19 formed in a lattice shape is installed in the lower protective frame 16, the lower end portion of the filter 14 is placed on the filter support plate 19, and a filter storage basket 15 is put on a portion rising from the lower protective frame 16. It has been. Reference numeral 20 denotes a waterproof seal that seals between the filter support frame 12 and the lower protective frame 16.

  The upper protective frame 17 will be further described. A plurality of rainwater inflow holes 21 are formed on the entire peripheral wall of the upper protective frame 17 and the protective cap 18. In particular, a large number of rainwater inflow holes 21 are uniformly formed in the circumferential direction and the vertical direction at small intervals in the circumferential wall upper part of the upper protective frame 17 and the circumferential wall of the protective cap 18, and the lower circumferential wall (upper circumferential wall upper part) of the upper protective frame 17 is formed. Except for the upper part of the peripheral wall, a small number of rainwater inflow holes 21 are formed in a scattered manner in the circumferential direction and the vertical direction.

  As a result, since the opening ratio of the upper peripheral wall of the upper protective frame 17 and the peripheral wall of the protective cap 18 is larger than that of the lower peripheral wall of the upper protective frame 17, earth and sand accumulated in the collecting basin 1 are unlikely to flow into the filter body 3. On the other hand, relatively clean clean water temporarily stored in the water collecting tank 1 smoothly flows into the filter body 3 preferentially.

  In addition, the rainwater inflow hole 21 in the lower peripheral wall is also formed at a position almost the same height as the bottom surface of the collecting mass 1 (see Fig. 2 (b)), so that the rainwater in the collecting mass 1 remains. Therefore, the rainwater is prevented from staying for a long period of time, which causes generation of pests such as mosquitoes in the water collecting tank 1.

  In such a configuration, the inflow direction of the rainwater flowing into the filter body 3 from the upper protection frame 17 during the rain is basically a horizontal direction, and a number of rainwater inflow holes 21 formed in the peripheral wall of the upper protection frame 17. From the inside of the filter body 3, contaminants such as dead leaves and dust contained in the rainwater are removed by the peripheral wall of the upper protective frame 17 and temporarily attached to the peripheral wall of the upper protective frame 17.

  Further, contaminants such as dead leaves and dust float on the water surface and do not clog the rainwater inflow hole 21 below the water surface, so that rainwater flows into the filter body 3 from the peripheral wall of the upper protective frame 17.

  As the amount of rainwater in the collecting basin 1 decreases, the inflow of rainwater from the upper protective frame 17 into the filter body 3 changes from the horizontal direction to the vertical direction, so that the upper protective frame 17 Deposits such as dead leaves and dust that have temporarily adhered to the peripheral wall of the water fall off when the water level drops when the inflow of rainwater stops and can be efficiently removed.

  Further, a large number of air vent holes 22 are uniformly formed on the entire upper end surface of the upper end surface of the protective cap 18. The air vent hole 22 is formed with a diameter as small as possible from the rainwater inflow hole 21. As a result, bubbles generated by the exchange phenomenon of rainwater and air, which occurs when rainwater flows into the filter body 3 and the permeation body 2 at the beginning of rainfall, escapes to the outside of the filter body 3, and the rainwater smoothly flows into the filter body 3. Inflow does not impair the inflow of rainwater.

  In addition, the filter body 3 is installed in the water collecting basin 1 and a lot of rainwater flows in from the side groove and the inflow pipe when it rains and receives a large dynamic pressure. However, the upper protection frame 17 of the filter protection frame 13 has a cylindrical shape. Since it is formed, it is difficult to receive dynamic pressure and the strength can be maintained.

  The filter support frame 12, the lower protection frame 16 and the upper protection frame 17 of the filter protection frame 13, and the protection cap 18 and the filter support plate 19 are all made of a hard resin such as a vinyl chloride resin.

  The filter 14 includes a cylindrical upper filter 14a, a lower filter 14b, and a top filter 14c installed at the upper end of the upper filter 14a. The filter 14 is inscribed in a cylindrical filter storage basket 15. Has been.

  The upper filter 14a and the top filter 14c allow water to pass through relatively clean rainwater even though suspended matter floats, but have a water permeability that blocks a material that has a relatively high specific gravity such as earth and sand and tends to settle on the bottom of the water.

  In other words, the suspended solids are not clogged, but the earth and sand are clogged and have a water permeability that substantially blocks the inflow of rainwater. In addition, the installation of the top filter 14c covers the entire top filter 14a, including the gap created by rolling the permeable cloth, and the top filter 14c is the upper filter. Together with 14a, it has the same water permeability as the upper filter 14a.

  On the other hand, the lower filter 14b is formed so as to have a water permeability that substantially blocks suspended substances and earth and sand.

  The filter 14 is composed of an upper filter 14a and a top filter 14c having a high water permeability and a lower filter 14b having a lower water permeability than the upper filter 14a and the top filter 14c. Even if suspended substances are floating, relatively clean rainwater flows into the infiltrate from the upper filter 14a and the top filter 14c, and substances that have a relatively high specific gravity such as earth and sand and tend to settle on the bottom of the water are those with lower water permeability. By substantially blocking with the filter 14b, it is possible to promptly drain the rainwater during the rain into the ground.

  Also, dead leaves and dust floating on the surface of the water float around the upper protective frame 17 and temporarily adhere to the peripheral wall of the upper protective frame 17, and fall off when the water level drops when the inflow of rainwater stops Therefore, it can be removed efficiently.

  The upper filter 14a, the lower filter 14b, and the top end filter 14c are all formed from a water-permeable cloth such as a synthetic fiber nonwoven fabric. In addition, a synthetic fiber nonwoven fabric having water permeability is wound into a cylindrical roll, and a thin synthetic fiber nonwoven fabric having a small water permeability is wrapped around the upper portion of the outer periphery, so that an upper filter 14a having a high water permeability is formed on the upper portion. The filter 14 having the lower filter 14b having a low water permeability in the lower part can be formed.

  In addition, the filter 14 is installed in the filter storage basket 15 so that the filter 14 retains its original shape even if there is a partial shift or breakage due to aging. Can be maintained for a long time.

  Further, the filter 14 may be formed by forming the upper filter 14a and the lower filter 14b in a cylindrical shape from materials having different water permeability, and placing the filters 14a and 14b on top of each other in the filter storage basket 15. it can.

  The filter storage cage 15 is formed of a stainless steel or hard synthetic resin material in the shape of a cylindrical cage in which the filter 14 is inscribed, and a bone wire (metal wire, etc.) 15a having a thickness of about 1.5 mm is provided on the outer periphery of the peripheral wall and the top end. A plurality of reinforcing materials are formed in the circumferential direction and the axial direction.

  In addition, a certain clearance is formed between the upper protective frame 17 and the filter 14 of the filter protective frame 13 by the bone wire 15a, so that rainwater flowing in from the rainwater inflow hole 21 of the upper protective frame 17 is spread over the entire surface of the filter 14. It has come to be accepted efficiently.

  Next, a method for laying the vertical rainwater infiltration facility of the present invention in the ground immediately below the existing water collection will be described.

(1) First, an opening 1a is opened in the center of the bottom of the catcher 1 and a permeation hole (vertical hole) A is excavated in the ground immediately below. The opening 1a is opened with a core cutter, and the permeation hole A is excavated using a building column and an auger. Note that a backhoe, a rafter crane, a crawler crane, or the like can be used in place of the building pillar.

(2) Next, after putting crushed stone as a crushed stone into the permeation hole A from the opening 1a at the bottom of the water collecting basin, the permeation pipe 5 with the permeation pipe sand-proof coating sheet 7 attached to the outer periphery of the lower part is stood up, A crushed stone layer 9 is formed by filling crushed stone around the permeation tube 5.

(3) Next, the filter support frame 12 is installed in the opening 1 a at the bottom of the water collecting tank 1, and the lower end portion of the filter support frame 12 is connected to the upper end portion of the permeation tube 5. Further, the support frame fixing mortar (not shown) is filled around the filter support frame 12 to fill the gap.

(4) Next, the water guide pipe 6 filled with the filter medium 8 is put in the permeation pipe 5. The filling amount of the filter medium 8 is set to the same height as that of the permeation pipe sandproof coating sheet 7.

(5) Next, the lower protective frame 16 of the filter protective frame 13 is installed in the filter support frame 12, and the lower end portion is connected to the upper end portion of the water conduit 6. In addition, a seal between the filter support frame 12 and the lower protective frame 16 is sealed with a water stop packing 20.

(6) Then, the filter support plate 19 is installed in the lower protective frame 16, and then the filter 14 placed in the filter storage basket 15 is installed. Since the lower protective frame 16 is installed in the filter support frame 12 in advance, the filter 14 can be installed in a surely self-supporting manner.

(7) Further, cover the upper protective frame 17 from above the filter storage basket 15, and push and fix the lower end portion between the filter support frame 12 and the lower protective frame 16 (gap).

  FIGS. 5 to 7 are other embodiments of the present invention, in which vertical rainwater infiltration is embedded and installed below the ground surface near the water collection, and connected to the water collection via a connecting pipe. The facility is illustrated (peak cut method).

  In the figure, instead of the upper protective frame 17 of the filter body 3, a different type of upper protective frame 23 is installed, and the different type of upper protective frame 23 is connected to a catchment 24 through a connecting pipe 25.

  The upper protective frame 23 of a different type opens in three directions, ie, the vertical direction and the lateral direction, and the lower end is pushed and fixed in the gap between the filter support frame 12 and the lower protective frame 17. Moreover, the opening provided in the side part forms the rainwater inflow hole 26, and the connecting pipe 25 that leads to the drainage 24 is connected to the rainwater inflow hole 26 by a plug-in type.

  Note that the different type of upper protective frame 23 is not necessarily limited to the shape as shown in the figure, and in particular, there are those in which the side opening is open in four directions or more, In addition, there is a case in which an opening that opens to the side opens in a stepped manner.

  In addition, the upper end of the upper protective frame 23 of a different type is opened to form an inspection / cleaning port for inspecting and cleaning the inside of the filter body 3 and the penetrating body 2, and the filter protective frame cover is attached to the inspection / cleaning port. 27 is detachably attached.

  Furthermore, the lower part in the upper protective frame 23 of the different type forms a filter storage space 23a in which the filter 14 and the filter storage basket 15 are inscribed, and the upper part forms an inflow water diffusion space 23b. A rainwater inflow hole 26 is provided on the side of the diffusion space 23b. Reference numerals 28 and 29 denote a storm water inflow pipe and a storm water discharge pipe connected to the water collecting basin 24, respectively.

  In such a configuration, when the amount of rainwater flowing into the catchment 24 is low at the beginning of the rain, the rainwater in the catchment 24 is drained through the rainwater discharge pipe 29 to another drainage facility such as a sewer pipe. If the amount of rainwater in the tank 24 exceeds a certain level, the rainwater flows from the filter body 3 into the permeation body 2 through the connecting pipe 25.

  In this case, rainwater flowing into the filter body 3 through the connecting pipe 25 is diffused in the inflowing water diffusion space 23b of the upper protective frame 23 of a different type, and is filtered from the upper end surface of the filter 14 and the entire peripheral wall surface. 14 flows into.

  Further, at the time of periodic inspection or cleaning, the filter protection frame lid 27 can be removed to check or clean the inside of the filter body 3 and the permeation body 2. Other configurations are substantially the same as those of the embodiment described with reference to FIGS.

  The vertical rainwater infiltration facility shown in FIG. 6 is buried under the ground surface near the perforated pipe or underdrain drainage pipe (not shown) laid as an infiltration trench pipe, and these pipes are connected via connecting pipes. It can also be connected.

  In the present invention, the relatively clean rainwater in which suspended solids float is allowed to flow through the filter body into the permeate directly below the filter body, while substances such as earth and sand that are relatively large in gravity and easily settle on the bottom of the water are blocked. The suspended matter that has flowed into the body is blocked by the penetrant, and only the water from which the suspended substance has been removed is permeated and drained into the ground around the penetrator, so that the filter body and the wall around the perforation hole are clogged. It is possible to maintain the permeation ability of the perforation hole peripheral wall surface over a long period of time.

1 collecting water
1a Opening 2 Penetration body 3 Filter body
4a Rainwater inflow pipe
4b Rainwater discharge pipe 5 Permeation pipe 6 Conduit pipe
6a Water guide hole 7 Sand permeation protection sheet 8 Filter media 9 Crushed stone layer
10 Penetration tube bottom cap
11 Conduit bottom cap
12 Filter support frame
13 Filter protection frame
14 Filter
14a Upper filter
14b Bottom filter
14c Top end filter
15 Filter basket
15a bone wire
16 Lower protective frame
17 Upper protective frame
18 Protective cap
19 Filter support plate
20 Waterproof seal
21 Rainwater inlet
22 Air vent
23 type upper protection frame
23a Filter storage space
23b Inflow water diffusion space
24 water collection
25 Connecting pipe
26 Rainwater inlet
27 Filter protective lid
28 Rainwater inflow pipe
29 Rainwater discharge pipe A Permeation hole (vertical hole)

Claims (7)

  In the vertical rainwater infiltration facility, comprising: a filter body into which rainwater flows and a permeation body that is installed in the ground immediately below the filter body and permeates rainwater that flows in from the filter body into the surrounding ground. The body includes a cylindrical filter and a filter storage basket in which the filter is inscribed, the filter includes an upper filter and a lower filter adjacent to each other in the vertical direction, and the permeability of the upper filter is higher than that of the lower filter. A vertical rainwater infiltration facility characterized by its large size.   The vertical rainwater infiltration facility according to claim 1, wherein the filter body includes a filter protection frame that is inscribed by a filter storage basket, and the filter protection frame includes a rainwater inflow hole through which rainwater in the rainwater drainage facility flows. A vertical rainwater infiltration facility characterized by   3. The vertical rainwater infiltration facility according to claim 2, wherein the filter protection frame includes a lower protection frame in which a lower portion of the filter is accommodated, and a filter support plate that is in the lower protection frame and supports the filter. A vertical rainwater infiltration facility characterized by   The vertical rainwater infiltration facility according to claim 2 or 3, wherein a bone wire material is provided on an outer periphery of the filter storage basket, and a gap is provided between the filter and the filter protection frame by the bone wire material. Rainwater infiltration facility.   The vertical rainwater infiltration facility according to any one of claims 1 to 4, wherein the infiltration body includes at least an infiltration pipe and a crushed stone layer installed on an outer periphery of the infiltration pipe, and the bottom surface of the infiltration pipe is blocked. A vertical rainwater infiltration facility characterized in that the lower peripheral wall is covered with a permeation pipe sandproof covering sheet.   6. The vertical rainwater infiltration facility according to claim 5, wherein a water conduit is installed inside the infiltration pipe, and the water conduit is installed so that it can be taken out.   The vertical rainwater infiltration facility according to claim 6, wherein a filtering material is filled in an inner lower portion of the water conduit.