JP2006342519A - Rainwater storage tank and bottom member therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottom member for a rainwater storage tank, which enables sediment and the like, flowing into the storage tank with rainwater, to be discharged by being surely guided to a prescribed discharge place, without being accumulated on the bottom surface of the storage tank, and the rainwater storage tank using the bottom member for the tank. <P>SOLUTION: A top surface of the bottom member for the rainwater storage tank is gently inclined downward from one end to the other end so as to discharge and guide the sediment. The sediment and the like, flowing into the storage tank with the rainwater, are guided to a sand discharge groove 2B along the drainage inclination of the bottom surface 2A of the tank, which is formed of the bottom members 21-24 for the tank, and guided to a sand basin 2C along the drainage inclination of the sand discharge groove 2B. Thus, the sediment and the like can be discharged by inserting a vacuum hose and the like from an inspection hole of a manhole 8 which is embedded in the ceiling part of the storage tank. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a tank bottom member laid at the bottom of a rainwater storage tank constructed underground such as a park so that rainwater can be used or stored so as to allow osmotic drainage, and a rainwater storage tank using the tank bottom member It is.

  2. Description of the Related Art Conventionally, a rainwater storage tank constructed in the basement of a park or the like so as to store rainwater or the like so that it can be used or permeated and drained is known. In this type of rainwater storage tank, a plurality of fillers for forming voids against the load from above and the earth pressure from the lateral direction are stacked vertically and horizontally (Patent Literature). 1 and 2).

  Here, in Patent Document 1, a water spray tube or an air diffuser pipe is provided between the fillers so as to be able to remove the earth and sand that has flowed into the storage tank together with rainwater and accumulated on the filler, and is disposed on the bottom surface of the storage tank. A structure in which a discharge groove is formed is disclosed.

Further, in Patent Document 2, in order to guide the earth and sand that flowed into the storage tank together with rainwater to a predetermined location so as to be sucked out by a vacuum hose or the like, an inclined plate is attached to each filler disposed at the bottom of the storage tank. A structure provided with a portion is disclosed.
JP 2000-160606 A JP 2004-52243 A

  By the way, in the structure of the rainwater storage tank described in Patent Document 1, although the earth and sand accumulated on the filler can be removed by watering sprayed from a water spray pipe, It is easy to deposit on the bottom of the tank in the process of being discharged into the discharge groove formed on the bottom of the tank. Moreover, in the structure of the rainwater storage tank described in patent document 2, there exists a possibility that the earth and sand etc. which flowed in the storage tank with rainwater may permeate | transmit each filler, and may accumulate on a tank bottom face.

  Accordingly, the present invention provides a rainwater storage tank and a rainwater storage tank bottom that can reliably guide and discharge the earth and sand flowing into the storage tank together with rainwater to a predetermined discharge location without retaining the bottom of the storage tank. The problem is to provide materials.

  The rainwater storage tank bottom member according to the present invention is characterized in that the upper surface is gently inclined downward from one end portion to the other end portion so as to flow and guide the earth and sand. The tank bottom member may be divided into a plurality of pieces in the vertical direction and / or the horizontal direction along the surface direction, and is formed into a box shape having an open bottom surface. Reinforcing ribs that connect the plate portions to each other may be integrally formed. Furthermore, it is preferable that the tank bottom member has a through-hole into which the leg portion of the filler is inserted into the top plate portion.

  The rainwater storage tank according to the present invention is a storage tank constructed so as to store rainwater or the like so that it can be used or permeated and drained, and the rainwater storage is filled with a plurality of fillers for forming voids. In the tank, a tank bottom member laid on the tank bottom so as to form a tank bottom surface having a slope of earth and sand, and a continuous flow having a soil slope of sand at a lower portion of the tank bottom surface formed by the tank bottom member. And a sand pool continuous to a lower portion of the sand drain groove, and an inspection port capable of discharging the earth and sand from the sand pool.

  In the rainwater storage tank according to the present invention, the earth and sand that flowed into the storage tank together with rainwater is guided to the sand discharge groove along the flow inclination of the tank bottom formed by the tank bottom member, and the flow inclination of the sand discharge groove. Therefore, it can be discharged from the inspection port of the storage tank.

  In the rainwater storage tank of the present invention, it is preferable that the tank bottom member is composed of a plurality of parts divided in the plane direction of the tank bottom because the tank bottom member can be easily laid on the tank bottom having a large area.

  Moreover, it is preferable that the through hole into which the support leg provided in the filling body is inserted is formed in the tank bottom member, because the filling body can be stacked in an upright position on the tank bottom member having a flow gradient of earth and sand. .

  Furthermore, it is preferable that a water discharge hole is provided in the upper part of the storage tank because sediments and the like accumulated in a plurality of fillers filled in the storage tank can be removed by water discharge.

  According to the rainwater storage tank bottom member according to the present invention, earth and sand flowing into the storage tank together with rainwater can be guided to the sand discharge groove along the flow slope of the tank bottom formed by the tank bottom member.

  In the rainwater storage tank bottom member of the present invention, when the tank bottom member is divided into a plurality of parts in the vertical direction and / or the horizontal direction along the surface direction, the tank bottom member is easily laid on the tank bottom having a large area. Because it is possible, it can be constructed by hand even in places where heavy machinery cannot be brought in.

  In the rainwater storage tank bottom member of the present invention, the bottom surface of the tank bottom member is molded into a box shape, and reinforcing ribs for interconnecting the left and right side walls and the top plate are integrally formed therein. If it is, the strength of the tank bottom member in the vertical direction and the horizontal direction is improved.

  In the rainwater storage tank bottom member of the present invention, when the through hole into which the leg of the filler is inserted is formed in the top plate portion of the tank bottom member, the filler is placed on the tank bottom member having the earth and sand flow slope. Stacking can be done in an upright position, and not only positioning of the fillers is facilitated, but also the construction can be facilitated because the connection between the fillers in the vertical and horizontal directions can be omitted.

  According to the rainwater storage tank according to the present invention, the earth and sand that flowed into the storage tank together with rainwater is guided to the sand removal groove along the flow slope of the tank bottom formed by the tank bottom member, and the flow of the sand removal groove It can be guided to the sand pool along the slope. And the earth and sand induced | guided | derived to the sand pool can be discharged | emitted from the inspection port of a storage tank.

  In the rainwater storage tank of the present invention, when a water discharge hole is provided in the upper part of the storage tank, earth and sand accumulated in a plurality of fillers filled in the storage tank can be removed by water discharge. The maintenance of storage is easy.

  Embodiments of a rainwater storage tank bottom member according to the present invention will be described below with reference to the drawings. 2 is a perspective view showing a rainwater storage tank bottom member according to one embodiment, FIG. 3 is an exploded perspective view of the tank bottom member, and FIG. 4 is a longitudinal sectional view of one tank bottom member.

  The rainwater storage tank bottom member 2 according to the embodiment is configured by a tank bottom surface 2A that is an upper surface of the tank bottom part 2 of the storage tank, that is, an upper surface of each tank bottom member 21 to 24 as shown in FIG. The tank bottom surface 2A is gently downwardly inclined to flow and guide the earth and sand from one end part to the other end part in the longitudinal direction of the tank bottom member, and the degree of the downward inclination is 0 to 3%. The inclination is not necessarily constant, and may be, for example, a concave shape or a convex shape.

  For example, as shown in FIG. 3, each tank bottom member 21 to 24 is a part having a shape in which the tank bottom portion 2 is divided into four parts in the vertical direction along the surface direction and four parts in the horizontal direction. The tank bottom 2 is constructed by laying vertically and horizontally. These tank bottom members 21 to 24 are integrally formed in a predetermined shape and structure with an appropriate synthetic resin.

  Here, the shape and structure of the tank bottom member 24 will be described on behalf of the tank bottom members 21 to 24. As shown in FIG. 4, the tank bottom member 24 is formed in a box shape having an open bottom surface. The upper surface 24A is gently inclined so as to constitute a part of the tank bottom surface 2A. Inside the tank bottom member 24, reinforcing ribs 24D for connecting the left and right side wall portions 24B and the top plate portion 24C to each other are integrally formed. A plurality of through holes 24E into which the respective leg portions 3C of the filler 3 shown in FIG. 1 are inserted are formed in the top plate portion 24C of the tank bottom member 24. The other tank bottom members 21 to 23 are configured in substantially the same manner as the tank bottom member 24.

  Next, an embodiment of a rainwater storage tank according to the present invention will be described with reference to the drawings. In the drawings to be referred to, FIG. 1 is a longitudinal sectional view schematically showing the entire structure of a rainwater storage tank according to an embodiment.

  For example, as shown in FIG. 1, the rainwater storage tank according to the embodiment is constructed in a basement such as a park so as to store rainwater and the like in an available manner. In this rainwater storage tank, the peripheral wall 1 is made of concrete, and most of the tank bottom 2 is constituted by tank bottom members 21 to 24 laid on the ground of the tank bottom. And the ground of the inner surface of the surrounding wall part 1 and the tank bottom under the tank bottom part 2 is suitably covered with the water-proof sheet | seat which is not shown in figure.

  The storage tank has a substantially rectangular shape in a plan view, and a plurality of fillers 3 for forming voids are stacked vertically and horizontally on the tank bottom 2 in the tank. And the cover body 4 for comprising the ceiling part of a storage tank is each mounted and spread | laid on the upper surface of each filling body 3 stacked | piled up at the uppermost stage.

  A water-permeable sheet 5 is laid on the upper surface of each lid 4 spread, and a gravel layer 6 and a soil layer 7 are sequentially constructed thereon, and these constitute a ceiling portion of the storage tank. A manhole 8 having an opening / closing lid 8A is embedded in the ceiling portion so as to form an inspection port at the center of one end in the longitudinal direction of the storage tank, and a cylinder 9 having an opening / closing lid 9A is stored. It is embed | buried so that the hole for water discharge may be comprised in the other end part of the longitudinal direction of a tank. In addition, you may provide the manhole 8 and the cylinder 9 in the upper peripheral wall part of a storage tank, without providing in the ceiling part of a storage tank.

  Moreover, in the cylinder 9 embedded in the ceiling part of the storage tank, a water discharge pipe (not shown) for discharging water into the storage tank is installed, and the rainwater stored in the storage tank is absorbed. A water absorption pipe (not shown) is installed.

  Although not shown in the figure, an introduction pipe for introducing rainwater into the storage tank from a lateral groove or drainage groove on the ground, an overflow drainage groove, or the like can be provided.

  The rainwater storage tank according to the present invention is not limited to the above-described embodiment. For example, instead of forming the peripheral wall 1 of the storage tank with concrete, a water-impervious sheet or a water-permeable sheet may be stretched to cover the side surface of the filler, and the outside of the sheet may be backfilled with earth and sand. In addition, when a water-permeable sheet is stretched on the ground surface, an osmotic rainwater storage tank can be configured to store excess rainwater so as to allow osmotic drainage.

  The filler 3 is integrally formed of an appropriate synthetic resin. For example, as shown in FIG. 5, the frame 3 </ b> A and the frame 3 </ b> A are formed by crossing diagonally along the diagonal direction of the frame 3 </ b> A. It has a plurality of ribs 3B that connect the inside of the part 3A to each other, and a plurality of leg parts 3C that protrude downward from the four corners of the frame part 3A and the intersections of the ribs 3B.

  Each leg portion 3C of the filling body 3 is formed in a stepped pipe shape having a small-diameter fitting portion 3D at the lower end portion, and the fitting hole 3E of each leg portion 3C opening on the upper surface of the lower filling body 3. Further, the fitting portions 3D of the respective leg portions 3C of the upper filler 3 can be fitted. For this reason, the plurality of fillers 3 can be stably stacked up and down by fitting the fitting portions 3D into the fitting holes 3E of the leg portions 3C.

  The lid 4 is formed into a substantially square plate shape that matches the upper surface of the filler 3 with an appropriate synthetic resin. For example, as shown in FIG. 7, a plurality of water permeable holes 4 </ b> A arranged vertically and horizontally are formed through the lid 4.

  Although not shown in the drawings, on the outer peripheral surface of the frame portion 3A of each filling body 3, appropriate connecting portions such as hoses and grooves for integrally connecting the filling bodies 3 vertically and horizontally are integrally formed. Yes. Further, a reinforcing rib having a horizontal cross section is integrally formed in the fitting hole 3E at the top of each leg portion 3C of each filler 3.

  The filler used in the rainwater storage tank according to the present invention is not limited to the above embodiment, and can be replaced with various known fillers. For example, as shown in FIG. 6 (a), the container-like filling body is formed in a tapered shape such that the side walls become smaller toward the bottom, and the flat plate is bent into a plurality of continuous mountain shapes as shown in FIG. 6 (b). A filling body provided with a fitting portion in the section and the trough, a filling body having legs extending from one side of the base as shown in FIG. 6 (c), or a rectangular shape as shown in FIG. 6 (d) The filling body which provided the connection part on the upper and lower sides of this inclination board may be sufficient.

  Here, as shown in FIG. 1 and FIG. 2, the tank bottom surface 2 </ b> A that is the upper surface of the tank bottom 2 of the storage tank, that is, the tank bottom surface 2 </ b> A configured by the upper surfaces of the tank bottom members 21 to 24, Is gently inclined downward at 0 to 3% so as to flow and guide the earth and sand from the other end in the longitudinal direction of the storage tank in which the manhole 8 is disposed toward the one end in the longitudinal direction of the storage tank in which the manhole 8 is disposed. This downward slope is the flow slope of earth and sand.

  As shown in FIG. 1, a sand discharge groove 2 </ b> B and a sand pool 2 </ b> C are formed continuously to the peripheral wall portion 1 on one end portion side in the longitudinal direction of the storage tank. The sand discharge groove 2B is continuous with the lower part of the tank bottom surface 2A having the flow gradient of earth and sand, that is, the lower part of the upper surface of the tank bottom member 21. As shown in FIG. 7, the sand discharge groove 2 </ b> B is gently lowered at 0 to 3% so as to guide the sand and sand from the both ends in the short direction perpendicular to the longitudinal direction of the storage tank toward the center. It is inclined, and this descending slope is the flow slope of earth and sand.

  On the other hand, the sand reservoir 2C is continuous with the lower part of the sand discharge groove 2B having the flow gradient of the earth and sand so as to receive the sand flowing along the flow inclination of the tank bottom surface 2A and the flow inclination of the sand discharge groove 2B. It is configured. A manhole 8 that constitutes an inspection port for sucking and discharging the earth and sand from the sand reservoir 2C by a vacuum hose or the like is disposed on the ceiling portion above the sand reservoir 2C.

  In the rainwater storage tank of one embodiment configured as described above, rainwater due to rain permeates the soil layer 7 and the gravel layer 6, and this rainwater permeates the water permeable sheet 5 and the water permeable holes 4 </ b> A of the lids 4. And stored in the gaps between the respective fillers 3 in the storage tank. Moreover, when the rainwater introduction pipe is provided, it is further stored through the rainwater introduction pipe. The rainwater stored in the storage tank is appropriately absorbed from a water absorption pipe (not shown) installed in the cylinder 9 on the ceiling of the storage tank and reused for spraying on the lawn in the park. Is done.

  Here, the earth and sand that flowed into the storage tank together with the rainwater, along the flow slope of the tank bottom surface 2A of the tank bottom 2 of the storage tank, that is, the tank bottom surface 2A constituted by the upper surfaces of the tank bottom members 21 to 24. By being guided, it flows into the sand discharge groove 2B. And the earth and sand etc. which flowed in the sand removal groove 2B are accumulated in the sand pool 2C by being guided along the flow inclination of the sand removal groove 2B.

  Moreover, the earth and sand deposited on the plurality of fillers 3 filled in the storage tank is directed to each filler 3 from a water discharge pipe (not shown) installed in the cylinder 9 on the ceiling of the storage tank. The water flows down to the tank bottom surface 2A of the storage tank, is guided into the sand discharge groove 2B along the flow inclination of the tank bottom face 2A, and enters the sand pool 2C along the flow inclination of the sand discharge groove 2B. Induced and deposited.

  Therefore, in the rainwater storage tank according to the embodiment, it is possible to suck and discharge the sediment accumulated in the sand pool 2C by inserting a vacuum hose or the like from the manhole 8 into the sand pool 2C. If the vacuum hose can be inserted into the planar opening of the filler 3, the filler may be filled below the manhole. However, if the filler does not have a large planar opening, Do not fill the filler.

  The rainwater storage tank according to the present invention is not limited to the above-described embodiment. For example, when the area of the storage tank is relatively small, the tank bottom 2 shown in FIG. 2 may be configured by a single tank bottom member. Moreover, 2 A of tank bottom surfaces of the tank bottom part 2 are loosened by 0 to 3% so that earth and sand may be guide | induced toward the one end part and other end part of both sides from the center part of the longitudinal direction of a storage tank, as shown in FIG. You may change into the tank bottom face 2D of the mountain-shaped cross section provided with the flow inclination which descend | falls. In this case, a sand drain groove 2B and a sand reservoir 2C similar to the sand drain groove 2B and the sand reservoir 2C formed on the one end side in the longitudinal direction are also formed on the other end portion side in the longitudinal direction of the storage tank.

  Moreover, as shown in FIG. 9, the tank bottom 2A shown in FIG. 2 is 0 to 3% so as to guide the earth and sand from both ends in the short direction perpendicular to the longitudinal direction of the storage tank toward the center. You may change into the tank bottom face 2E of the trough-shaped cross section provided with the flow inclination which descend | falls loosely. In this case, the sand removal groove continuing to the lower part of the tank bottom surface 2E is a sand removal groove 2F having a flow slope that gently falls by 0 to 3% from one end to the other end in the longitudinal direction of the storage tank. The sand reservoir 2G continuous to the lower portion of the sand discharge groove 2F is formed on the other end side in the longitudinal direction of the storage tank.

  Furthermore, the rainwater storage tank according to the present invention has a circular planar shape as shown in FIG. 10, and 0 to 3% so as to guide the earth and sand from the center to the periphery of the tank bottom on the upper surface of the circular tank bottom. It is good also as the low conical tank bottom face 2H provided with the flow inclination which descends gently. In this case, the sand discharge groove 2J continuous to the lower portion of the tank bottom surface 2H has a flow slope that gently falls at 0 to 3% so as to guide the earth and sand from one side around the tank bottom surface 2H to the opposite side. An annular sand removal groove 2J is formed, and a sand pool 2K continuous to the lower portion of the sand removal groove 2J is formed around the tank bottom 2H.

  Here, the tank bottom surfaces 2D, 2E, and 2H shown in FIGS. 8 to 10 may be configured by the upper surface of a single tank bottom member, or the upper surface of a group of tank bottom members divided into a plurality of parts. You may comprise.

  Moreover, if the water-permeable sheet | seat (illustration omitted) which suitably covers the inner surface of the surrounding wall part 1 shown in FIG. 1 and the ground of the tank bottom under the tank bottom part 2 is changed into a water-permeable sheet, it can permeate and drain excess rain water. The rainwater storage tank to store can be comprised.

  The shape of the tank bottom formed by the tank bottom member in the present invention is not limited to the above embodiment, and can be formed by appropriately combining the tank bottom members of the above embodiments. Accordingly, the shape of the bottom surface of the tank formed by the tank bottom member is provided with a sand removal groove having a flow slope continuous to one or a plurality of sand pools, and a lower portion of the tank bottom having a flow slope is continuous with the sand discharge groove. Any configuration can be used.

It is a longitudinal section showing roughly the whole structure of a rainwater storage tank concerning one embodiment of this invention. It is a perspective view which shows the rainwater storage tank bottom member which concerns on one Embodiment. It is a disassembled perspective view of the tank bottom member shown in FIG. 1 and FIG. It is one longitudinal cross-sectional view of the tank bottom member shown to FIG. 1 and FIG. It is a perspective view which shows the structure of the filling body shown in FIG. It is a front view, perspective view, or sectional view showing other embodiments of a filler. It is a perspective view which shows the structure of the cover body shown in FIG. It is a perspective view which shows typically the modification of the tank bottom face of the rainwater storage tank shown in FIG. It is a perspective view which shows typically the other modification of the tank bottom face of the rainwater storage tank shown in FIG. It is a perspective view which shows typically the tank bottom face of the rainwater storage tank which concerns on other embodiment.

Explanation of symbols

1 peripheral wall 2 tank bottom
2A Tank bottom 2B Sand drainage groove 2C Sand pool 3 Filler 4 Lid 5 Water permeable sheet 6 Gravel layer 7 Soil layer 8 Manhole 9 Cylindrical body 21-24 Tank bottom member

Claims (8)

  A storage tank constructed so as to store rainwater or the like so that it can be used or osmotically drained, and in the rainwater storage tank bottom member that is integrally formed with synthetic resin in the tank, the upper surface extends from one end to the other. A rainwater storage tank bottom member characterized by being gently inclined downward toward the part.   The rainwater storage tank bottom member according to claim 1, wherein the tank bottom member is divided into a plurality of parts in the vertical direction and / or the horizontal direction along the surface direction.   The bottom surface of the tank bottom member is formed into an open box shape, and reinforcing ribs that interconnect the left and right side wall portions and the top plate portion are integrally formed therein. The rainwater storage tank bottom member according to 1 or 2.   The rainwater storage tank bottom member according to any one of claims 1 to 3, wherein a through hole into which a leg portion of the filler is inserted is formed in the top plate part of the tank bottom member.   A storage tank constructed so as to store rainwater or the like so that it can be used or permeated and drained, and in the rainwater storage tank filled with a plurality of fillers for forming gaps, the tank has a flow gradient of earth and sand. A tank bottom member laid on the tank bottom so as to form a tank bottom, a sand discharge groove having a flow slope of earth and sand at a lower portion of the tank bottom formed by the tank bottom member, and the sand discharge A rainwater storage tank comprising: a sand pool continuing to a lower portion of the groove; and an inspection port capable of discharging earth and sand from the sand pool.   6. The rainwater storage tank according to claim 5, wherein the tank bottom member is composed of a plurality of parts divided in the vertical direction and / or the horizontal direction along the surface direction of the tank bottom.   The rainwater storage tank according to claim 5 or 6, wherein the tank bottom member is formed with a through hole into which a support leg provided in the filler is inserted.   The rainwater storage tank according to any one of claims 5 to 7, wherein a water discharge hole is provided in an upper part of the storage tank.

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