JP5263698B2 - Rainwater storage facility - Google Patents

Description

  The present invention relates to a rainwater storage facility provided under a ground such as a park, a parking lot, or a road.

  Conventionally, rainwater storage facilities have been provided under road surfaces such as parks and parking lots to prevent flooding of rivers and sewers due to heavy rain while allowing accumulated rainwater to be used as needed. As such a rainwater storage facility, for example, as described in Patent Document 1, a water storage tank whose bottom surface is formed in a rainwater induction inclined surface by digging the ground is provided, and rainwater is stored in the water storage tank. A rainwater storage part is formed by laying a filling body having an internal space for storing water vertically and horizontally and stacking in a plurality of stages, and the rainwater storage part is covered with a laminated covering material such as a sheet material or a paving material, and A sand drain groove communicating with the bottom of the manhole is provided on the lower inclined end side of the guide inclined surface. During heavy rain, rainwater is introduced and stored in the rainwater storage section, while the rainwater in the storage section is discharged. At that time, earth and sand, mud, etc. (hereinafter referred to as sand) that has flowed into the reservoir together with rain water flow down on the above-mentioned guiding inclined surface of the tank bottom and are introduced into the manhole through the sand removal groove. Settled to the bottom of the manhole sand with discharging water to the outside, it is deposited, is configured so as to exclude from the manhole by vacuum device or the like.

  Further, Patent Document 2 forms a storage tank in which a U-shaped side groove is provided in the center of the bottom surface by digging the ground, and an inclination for guiding rainwater toward the U-shaped groove on the bottom surface of the storage tank. A large number of first filling members having plate portions are stacked in multiple rows and multiple stages, and a second filling member that stores rainwater on the uppermost first filling member via a partition plate is stacked in another row and multiple stages. 2 The covering member is covered with a covering material, while the end of the U-shaped side groove communicates with the bottom of the manhole, and rainwater in the second filling member is U-shaped together with sand etc. by the inclined plate portion of the first filling member. A rainwater storage facility is described that is configured to be guided to a side groove and to remove sediments such as sand accumulated in the U-shaped side groove through a manhole through a vacuum device and a washing water injection pipe having an injection nozzle.

JP 2006-342520 A JP 2004-52243 A

  However, according to the former rainwater storage facility, as a means for introducing rainwater in the rainwater storage portion composed of a large number of fillers for storing rainwater into the bottom of the manhole together with sand contained in the rainwater, Since the bottom surface is formed by a guide inclined surface that is inclined downward toward the manhole, forming the bottom surface of the water storage tank in such an inclined surface not only requires significant labor and labor, but also vertically and horizontally. The thickness of all the packings at the lowest stage in the array is formed so that the thickness is gradually increased in the direction of the inclined surface as the inclined surface becomes lower. It is necessary to make it possible to arrange the upper packing bodies having thicknesses in the vertical and horizontal directions, and there is a problem that the structure becomes complicated and the cost is high and the construction cost is high.

  On the other hand, according to the latter rainwater storage facility, the first filling member of the same size and the same shape having a certain thickness can be formed side by side in the vertical and horizontal directions by forming the bottom surface of the storage tank in a flat horizontal plane. Since the means for depositing the sand is formed by a U-shaped groove provided in the center of the bottom of the storage tank, such a U-shaped groove is excavated in the groove bottom and the surface is waterproofed together with the groove bottom. In order to achieve this, considerable labor and labor are required as in the former rainwater storage facility. In addition, when the first filling member is disposed on the bottom surface of the storage tank, these first filling members are used. It must be constructed while confirming that the lower inclined end side of the inclined plate portion provided on the U-shaped groove side is directed to the U-shaped groove side, and the U-shaped groove is also formed in advance on the inclined plate portion of the first filling member. It is necessary to excavate and form so that the downward inclined end leads to the opening of the groove Tsu was a problem occurs.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is that the structure is simple and can be constructed efficiently and accurately, as well as the storage of rainwater and the stored rainwater. It is an object of the present invention to provide a rainwater storage facility that can smoothly discharge and collect and remove sand contained in rainwater easily and reliably.

  In order to achieve the above object, according to the rainwater storage facility of the present invention, a plurality of rainwater guidance unit members are juxtaposed vertically and horizontally at the bottom of a water tank formed by excavating the ground. The rainwater storage unit is formed by laying a rainwater storage unit member having an internal space for storing rainwater on the rainwater induction unit and covering the upper surface of the rainwater storage unit. In a rainwater storage facility that is covered with a material and has a manhole at one end or in the middle of the rainwater storage part, the rainwater guide part guides rainwater toward the manhole, and the rainwater in the rainwater storage part And an inclined surface that is guided toward the groove.

  In the rainwater storage facility configured as described above, the invention according to claim 2 attaches a partition plate having a number of water passage holes penetrating in the vertical direction on each of the rainwater guidance unit members forming the rainwater guidance part. The rainwater storage unit member is laminated on the rainwater guidance unit via the partition plate.

  Furthermore, the invention according to claim 3 is characterized in that the rainwater storage unit member forming the rainwater guiding portion has a water guide groove for allowing rainwater to flow into the manhole at the center portion in the width direction of the bottom plate having a flat rectangular shape. In addition, the upper surface of both sides of the bottom plate is formed as a rainwater guiding inclined surface inclined downward toward the water guide groove with this water guide groove as the center, and for attaching a partition plate having a fixed height at at least four corners of the bottom plate. A central rainwater guidance unit member formed by projecting columnar protrusions and a bottom plate of the same size and shape as the bottom plate, and the top surface of the bottom plate is directed downward toward the rainwater guidance inclined surface of the central rainwater guidance unit member In addition, the bottom inclined end is formed in a rainwater induction inclined surface that is flush with the upper inclined end of the rainwater induction inclined surface of the central rainwater induction unit, and is constant at at least four corners of the bottom plate. Pillar for mounting the partition plate Characterized by comprising the both sides rainwater induction unit member formed by projecting the projection.

  In the rainwater storage facility according to claim 3, the invention according to claim 4 is characterized in that the lower end is on the four-way edge other than the edge part where the water guide groove in the bottom plate of the central rainwater guidance unit member is open, and the water guide A peripheral wall plate portion having a constant height located below the bottom surface of the groove is projected downward, and the invention according to claim 5 is characterized in that the four side ends of the bottom plate of the double-sided rainwater guiding unit member At the edge, a peripheral wall plate portion having a high height on the upper inclined end side and a lower height on the lower inclined end side projecting downward is projected from the lower end surface of the peripheral wall plate portion. The height to the upper end of the columnar projection for attaching the partition plate provided at the four corners of the face plate is formed to be the same height as the entire surface, and to the same height as the central rainwater guidance unit member. And

  According to a sixth aspect of the present invention, in the bottom plate of the rainwater guiding unit member at the center and on both sides, both end edges parallel to each other perpendicular to the length direction of the water guide groove and on the intermediate part between the both end edges are constant. A side wall portion having a height is provided so that a rainwater induction inclined surface is provided between adjacent side wall portions, and an upper end surface of these side wall portions is formed as an inclined end surface for inducing rainwater toward the rainwater induction inclined surface. Furthermore, the partition plate mounting columnar protrusions are projected from both side end portions of the upper end surface of the side wall portion.

  In the invention according to claim 7, the rainwater storage unit member has the same height as the bottom plate of the rainwater guidance unit member, and the bottom plate portion of the same shape has a lower end that is fully open downward from the bottom plate portion. A plurality of hollow projections having an isosceles trapezoidal cross section project at regular intervals, and at the upper ends of these hollow projections, several pieces communicate with the hollow projections at integral intervals in the length direction of the hollow projections. Each of the hollow parts of the lower rainwater storage unit member is formed by forming a flat rectangular projecting top portion having a through-hole and changing the direction of the lower rainwater storage unit member and the upper rainwater storage unit member at right angles to each other. The protrusion tops of the protrusions are configured to be stacked by fitting into the lower end openings of the corresponding hollow protrusions of the upper rainwater storage unit member.

  According to invention of Claim 1, a rainwater storage part is formed by stacking a rainwater storage unit member on the rainwater guidance part formed by arranging and installing a plurality of rainwater guidance units vertically and horizontally at the bottom of the water storage tank. In the rainwater storage facility in which a manhole is provided at one end side or in the middle of the rainwater storage section, the rainwater guide section guides rainwater toward the manhole, and the rainwater in the rainwater storage section is supplied to the rainwater storage section. In the construction, the bottom surface of the water storage tank is inclined toward the manhole, and the U-side groove is not provided on the bottom surface. By installing rainwater guidance units side by side in parallel on the bottom formed on a flat horizontal surface, it is easy to install a rainwater guidance unit with a water guide groove that guides rainwater to the manhole. In addition to simplifying the structure, construction can be facilitated and the construction cost can be reduced, and rainwater storage is conducted toward the water guide groove along with the water guide groove guided to the manhole by the provision of the rain water guiding unit. An inclined surface for guiding rainwater in the section can be provided at the same time.

  Further, the rainwater in the rainwater storage part can be smoothly flowed into the water guide groove provided in the rainwater guide part through the inclined surface provided in the rainwater guide part, and is guided along with the rainwater into the water guide groove. Deposits such as sand accumulated in the groove can be easily washed and removed by inserting a high-pressure fountain nozzle or the like into the water guide groove from the manhole side after draining rainwater.

  Furthermore, according to the invention which concerns on Claim 2, the partition plate which has many water flow holes penetrated to the up-down direction on each said rainwater guidance | induction unit member which forms the rainwater guidance | induction part is attached, This partition plate Since the rainwater storage unit member is laminated on the rainwater guidance unit via, the upper surface of all the partition plates attached on the rainwater guidance unit member arranged side by side vertically and continuously in the horizontal plane direction, The rainwater storage unit members can be easily and accurately stacked on these partition plates to form an accurate and stable rainwater storage portion, and the rainwater in the rainwater storage portion is provided in the partition plate. The water can be evenly flowed down to the rainwater guiding part side through the water holes.

  According to the third aspect of the present invention, the rainwater guidance unit member forming the rainwater guidance part is formed with a water guide groove for allowing rainwater to flow into the manhole at the center in the width direction of the bottom plate of the rectangular plane. In addition, the upper surface of both sides of the bottom plate is formed as a rainwater guiding inclined surface inclined downward toward the water guide groove with this water guide groove as the center, and for attaching a partition plate having a fixed height at at least four corners of the bottom plate. A central rainwater guidance unit member formed by projecting columnar protrusions and a bottom plate of the same size and shape as the bottom plate, and the top surface of the bottom plate is directed downward toward the rainwater guidance inclined surface of the central rainwater guidance unit member In addition, the bottom inclined end is formed in a rainwater induction inclined surface that is flush with the upper inclined end of the rainwater induction inclined surface of the central rainwater induction unit, and is constant at at least four corners of the bottom plate. Column for mounting height divider Since it is composed of both side rainwater guidance unit members formed by projecting protrusions, by combining the central rainwater guidance unit member and both side rainwater guidance unit members, toward the water guide groove provided in the center of the central rainwater guidance unit member A pair of rainwater guidance unit bodies that can guide rainwater from both sides through the rainwater guidance inclined surface can be easily formed, and this rainwater guidance unit body is constructed so that the central water guide grooves communicate with each other in a straight line. Thus, it is possible to efficiently and accurately form the rainwater guiding portion corresponding to the size of the water storage groove.

  In addition, partition plate mounting columnar protrusions having a fixed height are provided at least at the four corners of the bottom plate of the central rainwater guiding unit member and the both side rainwater guiding unit members. By attaching a partition plate having a large number of water passage holes of the same size on the face plate, the rainwater storage unit member can be easily and stably placed on these rainwater guidance unit members arranged vertically and horizontally via the partition plate. Can be stacked.

  Furthermore, as described in claim 4, in the central rainwater guiding unit member, the lower end is lower than the bottom surface of the water guide groove at the four side edges other than the edge portion where the water guide groove is open in the bottom plate. Since the peripheral wall plate portion of a certain height located at the position protrudes downward, the peripheral rain plate unit can accurately install the central rainwater guiding unit member on the bottom surface of the water storage tank. At the same time, the rainwater storage unit member stacked on the rainwater guidance unit member can be firmly received.

  In addition, as described in claim 5, at the four side edges of the bottom plate of the double-sided rainwater guiding unit member, the height of the upwardly inclined end side of the rainwater-inducing inclined surface is high and the height of the downwardly inclined end side is low. The peripheral wall plate part protrudes downward, and the height from the lower end surface of this peripheral wall plate part to the upper end of the partition plate mounting columnar protrusion provided at the four corners of the bottom plate is the same overall height. And is formed at the same height as the central rainwater guidance unit member, so that both the rainwater guidance unit members together with the central rainwater guidance unit member can be easily and at the same height on the bottom surface of the water storage tank. Construction can be performed accurately, and the loaded load from the rainwater storage unit members stacked on these rainwater guidance unit members can be reliably received, and a stable rainwater storage facility can be configured.

  According to the sixth aspect of the present invention, in the bottom plate of the rainwater guiding unit member at the center and both sides, the two parallel edges perpendicular to the length direction of the water guide groove and the intermediate part between the two edges are provided. Protruding side wall portions with a certain height and providing rainwater-inducing inclined surfaces between adjacent side wall portions, and forming the upper end surfaces of these side wall portions into inclined end surfaces that guide rainwater toward the rainwater-inducing inclined surface Therefore, the inclined surface formed on the upper surface of the bottom plate by the side wall is divided into a plurality of narrow rainwater induction inclined surfaces, and rainwater is accurately guided toward the water guide grooves by the divided rainwater induction inclined surfaces. In addition, since the partition plate mounting columnar protrusions project from both side end portions of the upper end surfaces of all the side wall portions, the load of the rainwater storage unit member loaded on the partition plate can be reduced. Accepted almost evenly on the entire surface Rukoto can, it is possible to construct a more stable rainwater storage facilities.

  According to the seventh aspect of the present invention, the rainwater storage unit member has the same height and the same shape as the bottom plate of the rainwater guidance unit member. The hollow projections having a trapezoidal shape in cross section projecting at regular intervals, and communicating with the upper ends of these hollow projections in the hollow projections at integral intervals in the length direction of the hollow projections It has a flat rectangular protruding top with several through-holes, and the lower storm water storage unit member and the upper storm water storage unit member are turned at right angles to each other so that the lower storm water storage unit member Since it is configured to be stacked by fitting the projecting top of each hollow protrusion to the lower end opening of each corresponding hollow protrusion of the upper rainwater storage unit member, between the rainwater storage unit members adjacent to each other vertically The overlapping part is the pole It is possible to provide a large rainwater storage unit member of reservoir porosity rainwater less Te, rainwater induction unit member can be stably stacked state.

  In the present invention, the rainwater storage unit member is not limited to the above-described configuration, and includes a rainwater guidance unit member formed by arranging a cylindrical member of a certain height vertically and horizontally, a rainwater guidance unit member formed in a grid shape, and the like. Can be adopted.

A simplified longitudinal side view of a rainwater storage facility. The enlarged front view of the state which has piled up the rainwater storage part on the rainwater guidance part. The perspective view of a central rainwater guidance unit member. The front view. FIG. 4 is a longitudinal sectional front view taken along line AA in FIG. FIG. 4 is a longitudinal sectional front view taken along line BB in FIG. 3. The perspective view of a side part rainwater guidance unit member. The front view. FIG. 8 is a longitudinal sectional front view taken along line A′-A ′ in FIG. 7. B'-B 'line longitudinal front view in FIG. The top view of the state which combined the center and the side rainwater guidance | induction unit member. The simplified top view of a rainwater guidance | induction part. The perspective view of the state which attached the partition plate on the rain water guidance unit member. The top view which combined the rainwater guidance | induction unit member which attached the partition plate. The perspective view of a rainwater storage unit member. The longitudinal section front view of the state which has accumulated.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a rainwater storage facility has a planar rectangular shape on the bottom surface of a water tank 1 formed by digging the ground of a park or the like. The rainwater guiding unit 2 is formed by arranging and installing a plurality of rainwater guiding unit members 20 having a certain height (thickness) side by side in the vertical and horizontal directions while joining the end faces facing each other. The rain water storage unit member row | line | column of the 1st step | stage (bottom stage) is formed by arranging the rain water storage unit member 30 of the plane rectangular shape which has an internal space which stores rain water on 2 vertically and horizontally, and this rain water storage A rainwater storage unit member row of the second stage is formed by laying rainwater storage unit members 30 of the same size and shape on the unit member row vertically and horizontally, and this rainwater storage unit member row is duplicated. The rainwater storage part 3 is formed by stacking and stacking, and the rainwater storage part 3 is covered with a covering material 4 whose upper surface is formed on a paved road surface, and one end side of the rainwater storage part 3 A manhole 5 whose bottom is positioned below the lower end of the rainwater guiding portion 2 is provided, and an opening end of a water guide groove 22 described later provided in the rainwater guiding portion 2 is communicated with the bottom of the manhole 5. Yes. The rainwater guidance unit member 20 and the rainwater storage unit member 30 are molded products made of synthetic resin.

  Further, the rainwater storage unit member 30 may be stacked directly on the rainwater guidance unit member 20, but as shown in FIGS. 2 and 13, a number of passages penetrating vertically in each rainwater guidance unit member 20. A partition plate 6 having a water hole 6 a is attached, and a rainwater storage unit member 30 is installed on the partition plate 6. In the configuration described below, both ends of the water guide groove 22 in the length direction are front and rear ends, the manhole 5 side is the front side, and the direction perpendicular to the length direction of the water guide groove 22 is both sides. .

  The water storage tank 1 covers a waterproof sheet 11 from the bottom surface of the recessed portion formed by excavating the ground over a predetermined depth to a predetermined depth, and covers the entire surface of the four walls of the excavation. A concrete wall 12 is formed on the bottom surface, and the entire bottom surface is formed in a horizontal plane.

  The rainwater guiding portion 2 formed on the bottom surface of the water tank 1 is composed of a central rainwater guiding unit member 20A and side rainwater guiding unit members 20B and 20B disposed on both sides of the central rainwater guiding unit member 20A. As shown in FIGS. 3 to 6, the central rainwater guiding unit member 20A has a central portion between both side ends of a flat rectangular bottom plate 21 formed in a water guide groove 22 having a constant width over the entire length. , With the water guide groove 22 in the center, a constant height is provided from both side ends of the bottom plate 21 toward the water guide groove 22 at both front and rear edge portions on both sides of the bottom plate 21 and between the front and rear edge portions. The side wall portion 23 having a flat rectangular shape is provided so as to protrude from the both side ends of the bottom plate portion between the adjacent side wall portions 23, 23, that is, the bottom plate portion partitioned by the side wall portions 23, 23. Formed on rainwater-guided inclined surface 24 gently inclined downward toward both ends of 22 To have.

  The depth of the water guide groove 22 is constant over the entire length, but it is gently lowered downward from both side ends toward the center so that the center in the width direction is deeper than both ends. It is inclined, and both side end portions of the water guide groove 22 are formed as downward inclined end portions of the both-side rainwater induction inclined surfaces 24, 24 formed in a direction orthogonal to the water guide groove 22, The end side is the upper inclined end portion of the rainwater guiding inclined surfaces 24, 24 on both sides. Further, the side wall portion 23 is formed by bulging a part of the bottom plate 21 upward by a certain height, and therefore, the inside is formed hollow and the lower end is directed downward. Open all over.

  Further, the upper end surfaces of the side wall portions 23 provided at the front and rear side edge portions of the bottom plate 21 are respectively formed on inclined end surfaces 23a inclined downward from the front and rear ends toward the rainwater induction inclined surface 24, The upper end surface of the side wall portion 23 provided between the front and rear side wall portions 23, 23 is formed as a mountain-shaped inclined end surface 23a 'inclined downward from the center in the front-rear width direction toward the front and rear ends. Furthermore, partition plate mounting columnar protrusions 25, 25 having a fixed height are provided on both side end portions of the side wall portions 23 which are spaced apart in the length direction. This partition plate mounting columnar protrusion 25 is formed in a planar square shape with one side having the same dimensions as the front-rear width of the side wall portion 23 and is gradually tapered from the lower end toward the upper end. A partition plate locking projection 25a is provided at the center of the upper end surface, and a small diameter hole 25b is formed in the partition plate locking projection 25a. The inside of the partition plate mounting columnar protrusion 25 is also formed in a hollow portion communicating with the side wall portion 23.

  Further, the peripheral wall plate portion 26 having a lower end positioned below the outer bottom surface of the water guide groove 22 and having a lower end surface connected on the same plane at the front and rear and both side edges of the bottom plate 21 is directed downward. The height between the lower end surface of the peripheral wall plate portion 26 and the upper end surfaces of all the partition plate mounting columnar projections 25 is constant, that is, the height of the central rainwater guiding unit member 20A is constant. Is formed. Further, leg pieces 27a whose lower ends are located on the same plane as the lower end surface of the peripheral wall plate portion 26 are provided to protrude downward on both side ends of the water guide groove 22, and both the leg pieces 27a and the bottom plate 21 are provided on both sides. An intermediate leg piece 27b whose lower end is located on the same plane as the lower end face of the peripheral wall plate part 26 is provided on the lower surface of the bottom plate 21 at the intermediate part between the ends and projects downward. . The number of side wall portions 23 of the intermediate portion provided between the side wall portions 23 and 23 projecting from both front and rear edge portions on both side portions of the bottom plate 21 may be one. The interval between the side wall portions 23 and 23 adjacent to each other is the same.

  On the other hand, the side rainwater guiding unit member 20B disposed on both sides of the central rainwater guiding unit member 20A has the same planar shape as the bottom plate 21 of the central rainwater guiding unit member 20A, as shown in FIGS. The side wall portions 23 having the same size and the same planar shape as the side wall portions 23 projecting from both side portions of the front and rear end edges of the central rainwater guiding unit member 20A on both side portions of the front and rear end edges of the same bottom plate 21 ′ In addition to projecting 23 ′, a side wall portion 23 ′ having the same size and the same planar shape is also projecting at an intermediate portion between the front and rear side wall portions 23 ′. That is, the front and rear side wall portions 23 ′ and the intermediate side wall portion 23 ′ protruding from the bottom plate 21 ′, and the front and rear side wall portions 23 and the intermediate side wall portion protruding from the bottom plate 21 in the central rainwater guiding unit member 20A. 23 are provided at the same position on the bottom plate 21 and the bottom plate 21 ′, respectively, and the inside thereof is formed hollow, and the lower end is opened entirely downward.

  Further, on both side end portions having a certain interval in the length direction in all the side wall portions 23 ′, the partition plate mounting columnar protrusions 25, 25 provided on the central rainwater guiding unit member 20A have the same size and the same shape. Hollow partition plate mounting columnar projections 25 'and 25' that communicate with the inside of the side wall portion 23 'project from the inside, and the partition plate locking of the central rainwater guiding unit member 20A is formed at the center of the upper end surface of the column projections 25' and 25 '. A partition plate locking projection 25a ′ having the same size and shape as the projecting projection 25a is projected, and a small diameter hole 25b ′ is formed in the partition plate locking projection 25a ′. The intermediate side wall 23 ′ protruding from the bottom surface plate 21 ′ of the side rainwater guiding unit member 20B is also similar to the central rainwater guiding unit member 20A. Are provided at two locations between the side wall portions 23 and 23 projecting from the portion, and the interval between the side wall portions 23 and 23 adjacent to each other in the front-rear direction is the same.

  Further, a hollow side wall portion 23 having a plane shape that is the same size and the same shape as the side wall portion 23 'between the opposing surfaces of the side wall portions 23' and 23 'facing both sides and having a lower end opened downward. The three side walls 23 'and 23' 'form a series of side walls 23A continuous between the inner and outer side ends of the bottom plate 21'.

  Further, the bottom plate 21 ′ is inclined downward from the outer end toward the inner end, and the lower inclined end thereof is flush with the upper inclined end of the rainwater guiding inclined surface 24 of the central rainwater guiding unit member 20A. The outer rainwater induction inclined surface 24 ′ is formed on the bottom inclined plate 24 ′ in the front-rear direction. It is divided into three equal parts by the side wall 23A protruding at regular intervals.

  Like the bottom plate 21 of the central rainwater guiding unit member 20A, the bottom plate 21 'projects downwardly on the front and rear and on the four side edges on both sides. 26 'is formed so that the projecting height gradually lowers as the inclined surface of the bottom plate 21' becomes lower, and all the above partition plates are attached from the lower end surface of the peripheral wall plate portion 26. The height between the upper end surfaces of the columnar projections 25 'is constant, that is, the height of the side rainwater guidance unit member 20B is constant, and the same height as the central rainwater guidance unit member 20A. Forming. Further, leg pieces 27c and 27d are provided so as to protrude from the center and both sides of the bottom surface of the bottom plate 21 'in the front-rear direction so that the lower end surface is located on the same horizontal plane as the lower end surface of the peripheral wall plate portion 26'. .

  Further, the upper end surface of the side wall 23A provided at the front and rear end edges of the bottom plate 21 'is similar to the front and rear side wall portions 23 and 23 of the central rainwater guidance unit member 20A from the front and rear ends, respectively. The upper end surface of the side wall 23A provided in the intermediate portion between the front and rear side walls 23A and 23A is formed from the center in the front and rear width direction. It is formed in a mountain-shaped inclined end face 23a ′ inclined downward toward the front side so as to induce rainwater on the front and rear rainwater-inducing inclined face 24 ′.

  The central rainwater guiding unit member 20A and the side rainwater guiding unit member 20B configured as described above are arranged side by side in a vertical and horizontal manner so that they communicate with the bottom of the manhole 5 on the bottom surface of the water tank 1. In order to form the rainwater guide portion 2 to be operated, first, as shown in FIG. 11, the length direction of the water guide groove 22 provided in the central rainwater guide unit member 20A is set to the front and rear direction toward the manhole 5. Installed on the bottom surface of the water storage tank 1, the side rainwater guiding unit members 20B and 20B are formed on both sides of the central rainwater guiding unit member 20A and are inclined downwardly from a rainwater guiding inclined surface 24 'formed by the bottom plate 21'. Installed so that the end communicates with the upper inclined end of the central rainwater guidance unit member 20A and the side walls 23, 23 'facing each other are connected in a straight line, the central rainwater guidance unit member 20A and both side rainwater guidance Unit member 20B, 2 Assemble a set of rainwater guidance unit member rows that are lined up with 0B.

  A plurality of the rainwater guiding unit member rows are combined, and the front and rear end surfaces facing each other are joined so that the water guide grooves 22 provided in the central rainwater guiding unit member 20A communicate in a straight line in the front-rear direction. When the water storage tank 1 is wide, the rainwater guiding unit member rows are juxtaposed in parallel to the rainwater guiding unit member row as shown in FIG. A rainwater guiding portion 2 is formed over the entire bottom surface of the water storage tank 1. In addition, manholes 5 and 5 are respectively installed on the front end sides of the water guide grooves 22 and 22 communicating in a straight shape in each row.

  As shown in FIGS. 13 and 14, the partition plate 6 having a large number of water passage holes 6a is mounted on all the rainwater guiding unit members 20A and 20B constituting the rainwater guiding portion 2. The rainwater storage unit 30 is stacked on the partition plate 6 to form the rainwater storage part 3. As shown in FIG. 13, the partition plate 6 has a number of slit-shaped water passage holes 6a communicating between the upper and lower surfaces of a rectangular frame plate having the same size and shape as the rainwater guidance unit members 20A and 20B. The partition plate mounting columnar projections 25, 25 are provided on the entire surface and on the lower surface thereof, corresponding to the partition plate mounting columnar projections 25, 25 ′ projecting from the rainwater guiding unit members 20A, 20B. The partition plate locking projections 25a and 25a 'projecting at the center of the upper end surface of 25' are provided with locking holes 6b that fit into the partition plate locking projections 25a and 25a '. By fitting the stop holes 6a, the partition plates 6 are mounted on the rainwater guiding unit members 20A and 20B in an overlapped state.

  As shown in FIGS. 15 and 16, the rainwater storage unit member 30 constituting the rainwater storage unit 3 includes a bottom plate portion 31 having the same size and shape as the bottom plate 21 (21 ′) of the rainwater guidance unit member 20. A hollow protrusion 32 having a constant isometric cross-section with a constant height and having a lower end opened entirely from the bottom plate 31 is projected over a substantially entire length (full width) at regular intervals in the front-rear direction or the left-right direction. In addition, a plurality of through-holes 33 projecting from the upper ends of the hollow projections 32 are provided on the upper end surfaces of the hollow projections 32 so that the projection tops 34 extend in the length direction of the hollow projections 32. The protrusion tops 34 are formed in a planar rectangular shape whose length direction is directed to the length direction of the hollow protrusion 32, and the hollow protrusions. The opening width between the lower ends of the opposite inclined walls facing each other with a narrow interval of 32 is formed so that the protruding top 34 is covered across the protruding top 34 in the length direction. It is formed to the width possible.

  As shown in FIGS. 1 and 2, the rainwater storage unit member 30 thus configured is mounted on all the rainwater guidance unit members 20A, 20B forming the rainwater guidance unit 2 via the partition plate 6. In the same manner as the rainwater guidance unit members 20A and 20B, a rainwater storage unit member row arranged vertically and horizontally is formed, and several rainwater storage unit member rows are stacked with the rainwater storage unit member row as the first stage. The storage part 3 is comprised. At this time, as shown in FIG. 16, the lower rainwater storage unit member 30 and the upper rainwater storage unit member 30 installed on the rainwater storage unit member row change the direction perpendicular to each other in the plane direction. The hollow projection 32 of the upper rainwater storage unit member 30 intersects the hollow projection 32 of the upper rainwater storage unit member 30, and the lower open end surface of the upper hollow projection 32 is the lower rainwater reservoir. The hollow projection portion of the upper rainwater storage unit member 30 on the upper surface of the hollow projection portion 32 of the lower rainwater storage unit member 30 in a state of being fitted to the projecting top portion 34 protruding from the hollow projection portion 32 of the unit member 30 The lower end surface of 32 openings is received.

  Further, the entire upper surface of the uppermost rainwater storage unit member row in the rainwater storage section 3 is covered with a covering material 4 through a partition plate 6 ′. The covering material 4 may be formed by covering the top surface of the rainwater guiding portion 3 with a waterproof sheet 41 and providing an asphalt pavement layer 43 on the waterproof sheet 41 with a gravel layer or earth and sand layer 42 interposed therebetween. Alternatively, a water-permeable sheet is used in place of the waterproof sheet 41, and a water-permeable pavement layer is provided on the water-permeable sheet via a soil layer and the like, and rainwater is infiltrated into the rainwater storage unit 3 during rainfall. You may keep it.

  On the other hand, on the front end side of the rainwater storage part 3, the bottom surface is positioned below the front end opening of the water guide groove 22 corresponding to the water guide groove 22 in the rainwater guiding part 2, and the water guide groove is formed at the bottom of the rainwater storage part 3. A manhole 5 communicating with the front end of 22 is provided, and an open end of a water conduit 7 for supplying rainwater from a gutter or the like provided on a road shoulder in a road or the like faces the upper end portion of the manhole 5. At the same time, the opening end of the outlet pipe 8 that discharges a certain amount of rainwater to the outside through an orifice or the like faces the lower part of the manhole 5 than the water guide groove 22 of the rainwater guiding part 2.

  With this configuration, the rainwater that has flowed into the manhole 5 at the time of raining fills the bottom of the manhole 5, and a larger amount of rainwater than the amount of rain discharged to the outside from the manhole 5 through the outlet pipe 8 is determined. When it flows into the manhole 5, it flows into the water guide groove 22 provided in the central rainwater guide unit member 20A in the rainwater guide section 2 facing the bottom of the manhole 5, and fills the entire length of the water guide groove 22. Later, as the water level rises while flowing from the diversion grooves 22 of all the central rainwater guidance unit members 20A onto the rainwater guidance inclined surfaces 24, 24 provided on both sides of these central rainwater guidance unit members 20A, this rainwater guidance The unit members 24 and 24 flow from the upwardly inclined end to the rainwater-inducing inclined surfaces 24 'and 24' of the side rainwater-inducing unit members 20B and 20B in which the downwardly inclined end is connected to the upwardly inclined end.

  Further, the water level in the manhole 5 rises, and the water level rises after the space on the bottom plates 21 and 21 'forming the rainwater guiding inclined surfaces 24 and 24' is filled with rainwater. Then, all the hollow projections in the rainwater storage unit member 30 row at the lowest stage in the rainwater storage unit 3 through the numerous water holes 6a provided in the partition plate 6 installed on the rainwater guidance unit members 20A and 20B. It penetrates into the part 32. In the rain water guiding unit members 20A, 20B, the upper end projections of the hollow side wall portions 23, 23 ′ projecting upward from the bottom plate 21, 21 ′ in the space on the lower surface side of the bottom plates 21, 21 ′. Rainwater is filled through the small-diameter hole 25b ′ provided in the portion 25a ′. Further, the rainwater is filled in the space between the adjacent hollow projections 32 of each rainwater storage unit member 30 through the through holes 33 provided in the projecting tops 34 of these hollow projections 32.

  Thus, after the rainwater is filled in the first-stage rainwater storage unit member row in the rainwater storage unit 3 as the water level rises, and the water level further rises, the rainwater storage unit member row in the second and subsequent stages is sequentially turned in the same manner as described above. Rainwater fills up and is temporarily stored in this state.

  Next, when the amount of rain flowing into the manhole 5 is smaller than the fixed amount of rainwater discharged from the lead-out pipe 8, or when the rain stops, as the rainwater is discharged from the lead-out pipe 8 to the fixed amount, Rainwater stored in the rainwater storage part 3 is discharged to the manhole 5 side through the rainwater guidance part 2.

  Specifically, the rainwater stored from the rainwater guiding unit 2 to the rainwater storing unit 3 flows out into the bottom of the manhole 5 through the water guide groove 22 of the rainwater guiding unit 2, and along with this outflow, the rainwater storing unit The rainwater in 2 flows from inside the rainwater storage unit member row at the lowermost stage through the water passage hole 6a of the partition plate 6 into the central rainwater guidance unit member 20A and the both side rainwater guidance unit members 20B of the rainwater guidance unit 2, Rainwater on the central rainwater guiding unit member 20A passes directly through the water guiding groove 22 provided on the central rainwater guiding unit member 20A or on the rainwater guiding inclined surfaces 24, 24 provided on both sides of the water guiding groove 22. The rainwater that is guided to the water guide groove 22 and flows through the water guide groove 22 toward the manhole 5 in the opposite direction to the manhole 5 and that is filled on the rainwater guide unit member 20B on both sides is the central rainwater. Induction unit The above-mentioned water guide grooves are formed on the rainwater guiding inclined surfaces 24, 24 'of the central rainwater guiding unit member 20A from above the rainwater guiding inclined surfaces 24', 24 'communicating with the rainwater guiding inclined surfaces 24, 24 of the member 20A, respectively. It is guided to 22 and flows and is discharged from the water guide groove 22 to the manhole 5.

  It should be noted that rainwater on the side wall portions 23, 23 'protruding from the bottom plates 21, 21' of the rain water guiding unit members 20A, 20B is caused by the inclined upper end surfaces 23a, 23a 'of the side wall portions 23, 23'. Is directed toward the rainwater guiding inclined surfaces 24, 24 '.

  The rainwater discharged into the manhole 5 is discharged to the outside through the lead-out pipe 8, and the level of rainwater stored in the rainwater storage part 3 is lowered according to this discharge. Further, the sand contained in the rainwater settles and accumulates on the inner bottom portion of the manhole 5, and a part of the sand also accumulates on the water guide groove 22. And the sand deposited on the bottom of the manhole 5 is removed from the ground side by a vacuum device, while the sand deposited on the water guide groove 22 is removed from the manhole 5 after all the rainwater in the rainwater guiding section 2 is removed. By inserting a high-pressure spray nozzle into the water guide groove 22 and jetting high-pressure water, the high-pressure water is removed to the manhole 5 side and the water guide groove 22 is washed.

  In the above-described embodiment, the side wall portions 23 and 23 ′ are projected from the central rainwater guidance unit member 20A and the side rainwater guidance unit member 20B constituting the rainwater guidance unit 2. 23 and 23 ′ are not necessarily provided, and the bottom plate 21, 21 ′ is gently inclined downward from the outer end toward the water guide groove 22, and at least four corners of the bottom plate 21, 21 ′ are provided. Any structure may be used as long as it can support the load on the partition plate 6 via the partition plate 6 by the partition plate mounting columnar projections 25 and 25 ′ protruding from the section.

  Moreover, as the rainwater storage unit member 30 which comprises the rainwater storage part 3, it is not limited to the said structure, The rainwater induction | guidance | derivation unit member which provides the cylindrical member of the fixed height known conventionally vertically and horizontally, A rainwater guiding unit member or the like formed in a grid shape may be adopted, and the rainwater storage unit 3 may be configured by only one stage without being stacked in a step shape. Furthermore, although the manhole 5 is provided along the one end surface of the rainwater guidance | induction part 2 from this rainwater storage part 3 in the one end side of the rainwater storage part 3, you may provide in the both ends of the rainwater storage part 3, In FIG. 12, for example, in FIG. 12, one rainwater guiding unit member 20A is replaced with a manhole together with the rainwater storage unit member 30 stacked on the rainwater guiding unit member 20A, and the bottom of the manhole An opening may be provided on the four wall surfaces, and the water guide groove 22 of the rainwater guiding unit member 20A may be communicated with the opening. In this case, this manhole is in the center, and the rainwater guiding unit member 20A row is arranged in all four directions.

DESCRIPTION OF SYMBOLS 1 Water tank 2 Rainwater guidance | induction part 3 Rainwater storage part 4 Coating | covering material 5 Manhole 6 Partition plate
20A Central rainwater guidance unit member
20B Side rainwater guidance unit member
21 Bottom plate
22 Water guide channel
23 Side wall
24 Rainwater-induced inclined surface
25 Columnar projection for attaching partition plate

Claims (7)

  A plurality of rainwater guidance unit members are arranged side by side at the bottom of a water tank formed by excavating the ground to form a rainwater guidance part, and an internal space for storing rainwater on this rainwater guidance part is provided. In the rainwater storage facility in which the rainwater storage unit is formed by laying the rainwater storage unit member, the upper surface of the rainwater storage unit is covered with a covering material, and the manhole is provided at one end side or in the middle of the rainwater storage unit. A rainwater storage facility characterized in that the rainwater guide section includes a water guide groove that guides rainwater toward the manhole and an inclined surface that guides rainwater in the rainwater storage section toward the water guide groove.   A partition plate having a large number of water passage holes penetrating in the vertical direction is mounted on each rainwater guide unit member forming the rainwater guide unit, and the rainwater storage unit member is mounted on the rainwater guide unit via this partition plate. The rainwater storage facility according to claim 1, wherein the rainwater storage facility is laminated.   The rainwater storage unit member forming the rainwater guiding portion has a groove portion for allowing rainwater to flow into the manhole at the center portion in the width direction of the bottom surface plate having a rectangular rectangular shape, and both sides of the bottom surface plate with this groove portion as the center. A central rainwater guiding unit member formed with a rainwater guiding inclined surface inclined downward toward the groove, and having partition plate mounting columnar protrusions having a fixed height projecting at least at four corners of the bottom plate; A bottom plate having the same size and shape as the bottom plate, and the top surface of the bottom plate is inclined downward toward the rainwater induction inclined surface of the central rainwater induction unit member, and the lower inclined end is a central rainwater induction The rainwater-inducing inclined surface of the unit is formed in a rainwater-inducing inclined surface that is flush with the upper inclined end of the unit, and partition plate mounting columnar protrusions with a fixed height are projected from at least four corners of the bottom plate. Both sides rainwater induction unit Rainwater storage facility according to claim 1 or claim 2, characterized in that it consists of a wood.   A peripheral wall plate portion of a fixed height with its lower end positioned below the bottom surface of the groove is projected downward on the four side edges other than the edge portion where the groove is open in the bottom plate of the central rainwater guidance unit member. The rainwater storage facility according to claim 3, wherein the rainwater storage facility is provided.   On the four side edges of the bottom plate of the rainwater guiding unit member on both sides, a peripheral wall plate portion with a high height on the inclined side and a low height on the inclined side is projected downward. Yes, the height from the lower end surface of the peripheral wall plate portion to the upper end of the columnar projection for attaching the partition plate provided at the four corners of the bottom plate is entirely equal, and the central rainwater induction unit member and The rainwater storage facility according to claim 3 or 4, wherein the rainwater storage facility is formed at the same height.   In the bottom plate of the rainwater guiding unit member at the center and both sides, side walls having a fixed height project from both end edges parallel to each other perpendicular to the length direction of the groove and an intermediate portion between the both end edges. A rainwater induction inclined surface is provided between adjacent side wall portions, and the upper end surfaces of these side wall portions are formed as inclined end surfaces for inducing rainwater toward the rainwater induction inclined surface. The rainwater storage facility according to claim 1, wherein columnar protrusions for attaching a partition plate are provided to project at both end portions.   The rainwater storage unit member is the same size and shape as the bottom plate of the rainwater guidance unit member. Projected at every interval, and formed at the upper end of these hollow projections with a flat rectangular projecting top with several through holes communicating with the hollow projections. The unit member and the upper rainwater storage unit member are turned at right angles to each other so that the projecting tops of the hollow protrusions of the lower rainwater storage unit member are the lower end openings of the corresponding hollow protrusions of the upper rainwater storage unit member. The rainwater storage facility according to claim 1, wherein the rainwater storage facility is configured to be stacked by being fitted to each other.

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