JP4803679B2 - Rainwater storage / penetration tank bottom structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rainwater storage / penetration tank constructed underground such as in a park so that rainwater can be used or stored in an osmotic drainage manner. Specifically, the tank has a fluid surface that allows sediment to flow. The filler which forms a space | gap in the inside is related with the bottom face structure of storage / penetration tanks, such as rainwater, which enabled it to install in a horizontal surface.

  Rainwater storage / penetration tanks are generally known that are constructed underground such as parks so that rainwater can be used or can be osmotically drained. In this type of rainwater storage / penetration tank, a plurality of fillers for forming gaps against the load from above and the earth pressure from the lateral direction are stacked vertically and horizontally.

  In these rainwater storage and infiltration tanks, if used for a long period of time, mud or dust contained in rainwater flowing into the tank accumulates on the bottom of the filling body or tank, There is a problem of reducing effective water storage. Therefore, it is necessary to remove mud and garbage. In order to remove mud and dust, the filler is washed, or earth and sand accumulated on the bottom surface is guided to a predetermined location and sucked out by a vacuum hose or the like.

In order to naturally guide earth and sand to a predetermined place, the bottom of the tank may be formed on an inclined surface, but the filling body is formed so as to be installed on a horizontal surface. It cannot be installed on the bottom. Therefore, it has been proposed to form the bottom surface of the tank as an inclined surface while maintaining the filler horizontally.

For example, in Japanese Patent Application Laid-Open No. 2002-129640, a water tank is formed by forming a slope by pulling mortar at the time when a first-stage filling body is installed, and then stacking the remaining filling bodies as many times as necessary after forming the slope. Is disclosed. Japanese Patent Application Laid-Open No. 2006-342520 discloses that the bottom surface of the tank is formed on an inclined surface on which earth and sand flow, and the lowermost packing body installed on the inclined surface has a leg portion so that the upper surface has the same height. It is disclosed to adjust the length.
JP 2002-129640 A JP 2006-342520 A

  By the way, in the structure of the rainwater storage / penetration tank described in Patent Document 1, not only the mortar is drawn but also a slope is formed when the filling body is installed, and a uniform slope is formed between the legs of the filling body. It is not only troublesome to form, but is very difficult. On the other hand, in the rainwater storage tank described in Patent Document 2, it is relatively easy to form the tank bottom surface on an inclined surface, but the length of the leg portion of the filling body as the first stage is adjusted to the inclined surface. There is a problem that must be adjusted.

  Therefore, the present invention can easily form a flow surface that reliably guides to a predetermined discharge location without causing sediment or the like flowing into the storage tank together with rain water to stay on the tank bottom surface of the storage tank. Is to provide a rainwater storage and infiltration tank that can be installed on a horizontal surface.

According to the present invention, the bottom structure of a storage / penetration tank for rainwater, etc. can use rainwater or the like by covering the peripheral wall portion and bottom portion of the tank portion formed by digging the ground with a water shielding sheet or a water permeable sheet, etc. It is a storage / penetration tank for rainwater, etc. constructed so as to be stored so that it can be drained, and the bottom surface of the tank forms a flow surface for flowing earth and sand between the plurality of protrusions whose upper surface is a horizontal surface and the protrusions. The plurality of protrusions having the horizontal surface are provided with a receiving material for positioning a filling material to be filled in order to form a gap in the tank, and the receiving material includes an upper plate and a side plate. The upper plate is provided with a receiving opening for inserting a leg portion of the filler, or a protrusion parallel to the side surface. The receiving port of the receiving material may be a receiving port formed by a through hole formed in the upper plate, or may be an annular receiving port protruding from the upper plate, as long as the filling member can be positioned. Further, the upper plate of the receiving material can be formed on a curved surface or an inclined surface protruding upward.

According to the present invention, the bottom structure of a storage / penetration tank for rainwater, etc. can use rainwater or the like by covering the peripheral wall portion and bottom portion of the tank portion formed by digging the ground with a water shielding sheet or a water permeable sheet, etc. It is a storage / penetration tank for rainwater, etc. constructed so as to be stored so that it can be drained, and the bottom surface of the tank forms a flow surface for flowing earth and sand between the plurality of protrusions whose upper surface is a horizontal surface and the protrusions. It is good also as a structure which provides the recessed part for positioning the filling body filled in order to form a space | gap in a tank in the upper surface of the said protrusion.

  Since the storage and infiltration tank for rainwater and the like according to the present invention has formed a protrusion having a horizontal upper surface and a flow surface for allowing the earth and sand to flow, so that the tank bottom can be installed horizontally. The filling body can be stably placed in a horizontal state without adjusting the length of the leg portion, and there is no difficult work of forming a slope with mortar after the filling body is installed. Moreover, the earth and sand etc. which flowed into the tank together with rainwater can be guided to a predetermined sand pool without being retained on the bottom surface of the tank by the flow surface.

  Hereinafter, an embodiment of a bottom structure of a rainwater storage / penetration 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 / penetration tank according to an embodiment.

  For example, as shown in FIG. 1, the rainwater storage / penetration tank according to the embodiment is constructed in a basement such as a park so as to store rainwater and the like. In this rainwater storage tank, the peripheral wall portion 1 and the bottom portion 2 of the tank portion formed by digging the ground are formed of concrete, and the inner surface thereof is appropriately covered with a water-impervious sheet, or the stored rainwater or the like is infiltrated into the underground. In addition, the peripheral wall portion 1 and the bottom portion 2 are covered with a water-permeable material after retaining the periphery 1.

  The shape of the storage / penetration tank is not particularly limited. In the illustrated embodiment, the storage / penetration tank has a substantially rectangular shape in plan view, and a plurality of fillers 3 for forming voids are formed on the bottom 2 in the tank. They are arranged vertically and horizontally and are stacked in multiple stages. And the cover body 4 for comprising the ceiling part of a storage and osmosis | permeation tank is each mounted and spread | laid on the upper surface of each filling body 3 stacked | stacked on the uppermost stage.

  A water-permeable sheet is laid on the upper surface of each lid 4 spread, and a gravel layer 5 and a soil layer 6 are sequentially constructed thereon, and these constitute the ceiling portion of the storage / penetration tank. . In addition, a manhole 8 having an opening / closing lid 8A is embedded in the ceiling portion so as to form an inspection port in a central portion of one end in the longitudinal direction of the storage / penetration tank, and a cylindrical body 9 having an opening / closing lid 9A. Is embedded in the other end in the longitudinal direction of the storage tank so as to form a water discharge hole.

  In addition, you may provide the manhole 8 and the cylinder 9 in the upper peripheral wall part of a storage and a penetration tank, without providing in the ceiling part of a storage and a penetration tank. Although not shown in the figure, the storage / penetration tank may be provided with an introduction pipe for introducing rainwater into the storage / penetration tank from a side groove or drainage groove on the ground, an overflow drainage groove, or the like.

  As shown in FIG. 1, a sand discharge groove 23 is formed on one end side in the longitudinal direction of the storage / penetration tank. The sand removal groove 23 is gently inclined downward at 0.1 to 3% so as to flow and guide the earth and sand from both ends in the short direction perpendicular to the longitudinal direction of the storage / penetration tank to the center. This downward slope is the flow slope of earth and sand.

  And the sand reservoir 24 which receives the earth and sand which flows along the flow inclination of the flow surface 22 of the tank bottom face 2A and the sand discharge groove 23 is formed in the lower part of the sand discharge groove 23 having the flow inclination of the earth and sand. . A manhole 8 that constitutes an inspection port for sucking and discharging the earth and sand from the sand reservoir 24 by a vacuum hose or the like is disposed on the ceiling portion above the sand reservoir 24.

  The filler 3 is integrally formed of synthetic resin. For example, as shown in FIG. 2, the frame portion 31 is formed by intersecting the substantially square frame portion 31 and the diagonal direction of the frame portion 31 diagonally. And a plurality of leg portions 33 that protrude downward from the four corner portions of the frame portion 31 and the intersecting portions of the ribs 32.

  Each leg portion 33 of the filling body 3 is formed in a stepped pipe shape having a small-diameter fitting portion 34 at the lower end, and the fitting hole of each leg portion 33 that opens on the upper surface of the lower filling body 3. The fitting portion 34 of each leg portion 33 of the upper filler 3 can be fitted to 35. Therefore, the plurality of fillers 3 can be stably stacked up and down by fitting the fitting portions 34 into the fitting holes 35 of the leg portions 33.

  Next, based on FIG.3 and FIG.4, the structure of 2 A of tank bottom surfaces is demonstrated. 2 A of tank bottom surfaces are comprised by the protrusion 21 formed in the strip | belt shape which installs the filler 3, and the flow surface 22 which has a flow inclination. The protrusions 21 are formed so that the upper surface thereof is substantially horizontal and is arranged in parallel at a predetermined interval. Legs 33 of the filler 3 are installed on the upper surface of the protrusion 21.

  Further, the flow surface 22 is formed between the protrusions 21. Therefore, in this embodiment, the flow surface 22 is formed in a groove whose bottom surface is inclined. As described above, the flow surface 22 formed as a groove allows the sand and sand to flow from one end in the longitudinal direction of the storage / penetration tank in which the cylindrical body 9 is disposed toward one end in the longitudinal direction in which the manhole 8 is disposed. It is gently inclined downward with an inclination angle of 0.1 to 3% so as to be induced to flow. This descending slope is the earth and sand flow slope.

  The leg portion 33 of the filler 3 may be installed directly on the upper surface of the protrusion 21, but it is preferable to place the leg portion 33 via a receiving member 50 as shown in FIGS. 3 and 4. The receiving member 50 is formed in a U-shaped cross section by projecting side plates 52 at both ends of the upper plate 51 so as to fit the upper surface of the protruding portion 21, and the receiving port 54 protrudes from the upper surface of the upper plate 51. It is formed by installing. The receiving port 54 protrudes in an annular shape at the same interval as the leg portion 33 so that the lower end portion of the leg portion 33 of the filler 3 can be inserted. Thus, by installing the filler 3 on the protrusion 21 via the receiving member 50, the filler 3 is not detached and can be reliably installed in a stable state.

  The upper plate 51 of the receiving member 50 may be a horizontal surface, but may be a curved surface or an inclined surface protruding upward. When the upper plate 51 is a curved surface or an inclined surface, the upper plate 51 can flow to the fluid surface 22 without depositing earth or the like on the upper surface.

FIG. 5 shows another embodiment of the receiving member 50, and FIG. 5 (a) has an upper plate 51 as a curved surface and side plates 52 protruding at appropriate intervals. In FIG. 5B, triangular ribs 55 project from the lower surface of the upper plate 51 at appropriate intervals, and the upper plate 51 is simply formed by a through hole together with a receiving port 54 into which the leg portion 33 is fitted. A receiving port 54a is provided. When the side plates 52 of the receiving member 50 are provided at appropriate intervals as shown in FIG. 5, the material cost can be saved.

  Next, a second embodiment of the tank bottom 2A shown in FIG. 6 will be described. Concave portions 25 are provided on the upper surface of the protrusion 21 at substantially the same interval as the interval between the leg portions 33 of the filler 3. The concave portion 25 corresponds to the receiving port 54 of the receiving member 50 and is positioned by fitting the lower portion of the leg portion 33 into the concave portion 25.

In the first embodiment, the leg portion 33 of the filling body 3 is placed via the receiving material 50. However, in this embodiment, the leg portion 33 is provided on the protrusion 21 without using the receiving material 50. It was set as the structure directly fitted in the recessed part 25 which was. Since the flow surface 22 is formed between the protrusions 21, the configuration is the same as that of the first embodiment. Therefore, the configuration of the flow surface 22 is denoted by the same reference numeral, and the description thereof is omitted.

  FIG. 7 shows a third embodiment of the tank bottom surface 2A, and the flow surface 22a formed between the protrusions 21 is formed by using a flow surface forming member 60 having a U-shaped cross section. The fluid surface forming member 60 is formed in a U-shaped cross section by projecting side plates 62 on both side ends of the upper plate 61, and the height of the side plate 62 is gradually increased from one end to the other end. The upper plate 61 is configured to be an inclined surface.

  In the third embodiment, the tank bottom surface 2 </ b> A alternately forms protrusions 21 and horizontal grooves 63 whose upper surfaces are horizontal surfaces, and the fluid surface forming member 60 is inserted into the grooves 63 between the protrusions 21. Thus, the upper plate 61 is used as the flow surface 22a. In this 3rd Embodiment, since the protrusion 21 and the horizontal groove | channel 63 are each formed horizontally, formation of a tank bottom face is easy. In FIG. 7 shown as the third embodiment, the receiving member 50 may be attached or the recess 25 may be provided.

Moreover, FIG. 8 shows 4th Embodiment at the time of forming the protrusion 21 in the shape of an island vertically and horizontally. From the first embodiment to the third embodiment, the protrusion 21 is continuous in a band shape on the plane, but in this fourth embodiment, the protrusion 21a on which the leg 33 of the filler is placed is the filler to be installed. Each leg is formed independently. Also in the fourth embodiment, the receiving material 50 can be used. When the receiving material 50 is used, the receiving port 54 may be positioned at the protruding portion 21a. Moreover, you may provide the recessed part 25 which fits the lower end part of the leg part 33 of the filler 3 on the upper surface of the protrusion 21a similarly to 2nd Embodiment.

  In the first embodiment (see FIGS. 3 and 4), the second embodiment (see FIG. 6) and the fourth embodiment (see FIG. 8), in order to form the protrusions 21 and 21a and the flow surface 22, for example, First, the surface forming the flow surface of the tank bottom surface is formed on an inclined surface, and then the projections 21 and 21a having the upper surface as a horizontal surface are formed by disposing the mold. Moreover, in 3rd Embodiment, after forming a tank bottom face in a horizontal surface, the protrusion 21 which arrange | positioned the mold and set the upper surface as the horizontal surface is formed in parallel with a fixed interval, and between the protrusions 21 is formed. The fluid surface forming member 60 may be inserted into the horizontal groove 63.

  The filling body used for the rainwater storage / penetration tank according to the present invention is not limited to the embodiment shown in FIG. It is possible to replace it with a filler. For example, as shown in FIG. 9, a filling body 45 may be provided in which a flat plate is bent into a plurality of continuous mountain shapes and fitting portions 43 and 44 are provided in a peak portion 40 and a valley portion 41.

  When the filler 45 is used, it may be placed directly on the protrusion 21, but a receiving material 46 shown in FIG. 10 can be used. The receiving member 46 is formed in a U-shaped cross section by projecting side plates 52a on both side ends of the upper plate 51a so as to fit the upper surface of the protrusion 21, and along the side edge on the upper surface of the upper plate 51a. Are formed by projecting parallel projections 56. By locking the side surface of the trough 41 to the protrusion 56 of the receiving member 46, the filler 45 is not detached and can be reliably installed in a stable state.

  In the bottom structure of the storage / penetration tank according to the embodiment configured as described above, rainwater due to rain permeates the soil layer 6 and the gravel layer 5, and this rainwater permeates each cover body 4 to store / penetrate the tank. It accumulates in the space | gap between each filler 3 inside. Moreover, when the rainwater introduction pipe is provided, it is further stored through the rainwater introduction pipe. The rainwater stored in the storage / penetration tank is appropriately absorbed from a water absorption pipe (not shown) installed in the cylinder 9 in the ceiling of the storage / penetration tank, and is applied to the lawn in the park. It is used for etc.

  Here, the earth and sand that flowed into the storage / penetration tank together with rainwater flows into the sand discharge groove 23 by being guided by the flow surface 22.22a of the tank bottom surface 2A, which is the upper surface of the bottom 2 of the storage / penetration tank. However, the sand is accumulated in the sand pool 24 by being induced by the flow inclination of the sand discharge groove 23.

  In addition, earth and sand accumulated in a plurality of fillers 3 filled in the storage / penetration tank are filled from a water discharge pipe (not shown) installed in the cylinder 9 on the ceiling of the storage / penetration tank. By discharging water toward the body 3, it flows down to the tank bottom surface 2 </ b> A of the storage / penetration tank, is guided into the sand discharge groove 23 along the flow inclination of the tank bottom face 2 </ b> A, and follows the flow inclination of the sand discharge groove 23. Then, it is guided and accumulated in the sand pool 24.

  Therefore, in the bottom structure of the rainwater storage tank according to one embodiment, it is possible to suck and discharge the sediment accumulated in the sand reservoir 24 by inserting a vacuum hose or the like from the manhole 8 into the sand reservoir 24. If the vacuum hose can be inserted into the planar opening of the filler 3, the filler 3 may be filled below the manhole 8, but if the filler 3 does not have a large planar opening, The filling body is not filled below.

It is a longitudinal cross-sectional view which shows roughly the whole structure of storage and infiltration tanks, such as rain water, concerning one Embodiment of this invention. It is a perspective view which shows the structure of the filling body shown in FIG. It is a disassembled perspective view which shows the tank bottom face and the leg part of a filling body. It is principal part sectional drawing of the state which mounted the filler on the tank bottom face. It is a perspective view which shows other embodiment of a receiving material. It is a perspective view which shows 2nd Embodiment of a tank bottom face. It is a perspective view which shows 3rd Embodiment of a tank bottom face. It is a perspective view which shows 4th Embodiment of a tank bottom face. It is a perspective view which shows other embodiment of a filler. It is a perspective view which shows a receiving material suitable when mounting the filler shown in FIG.

Explanation of symbols

1: peripheral wall portion 2: bottom portion 2A: tank bottom surface 2B: sand removal groove 2C: sand pool 3: filling body 4: lid body 6: gravel layer 7: soil layer 8: manhole 9: cylinder 21: protrusion 22: flow Surface 23: Sand removal groove 24: Sand reservoir 25: Recess 50: Receiving member 51: Upper plate 52: Side plate 54: Receptor 55: Triangular rib 56: Through hole 60: Fluid surface forming member

Claims (5)

Storage and infiltration of rainwater, etc. constructed so that rainwater etc. can be used or stored so as to be able to seep and drain by covering the peripheral wall and bottom of the tank part formed by digging the ground with a water impervious sheet or water permeable sheet etc. a vessel, the vessel bottom comprises forming a flow surface for flowing the sediment between the plurality of projections and the projection forming the upper surface in a horizontal plane, the plurality of projections having a horizontal plane in the vessel A receiving material for positioning a filling body to be filled in order to form a gap is installed, and the receiving material is formed in a U-shaped cross section by an upper plate and a side plate, and the upper plate has a filling body. A bottom structure of a storage / penetration tank for rainwater or the like, characterized in that a receiving opening for inserting a leg portion of the water is provided, or a protrusion parallel to the side surface is projected . The bottom structure of a rainwater storage / penetration tank according to claim 1, wherein the receiving port of the receiving material is a receiving port formed by a through hole formed in the upper plate . The bottom structure of a rainwater storage / penetration tank according to claim 1, wherein the receiving port of the receiving material is an annular receiving port protruding from the upper plate . The bottom structure of a storage / penetration tank for rainwater or the like according to any one of claims 1 to 3 , wherein the upper plate of the receiving material is formed on a curved surface or an inclined surface protruding upward . Rainwater storage / penetration tank constructed to store rainwater etc. in a usable or osmotic drainable manner,
The bottom surface of the tank is formed with a plurality of protrusions having an upper surface formed in a horizontal plane and a fluid surface for flowing earth and sand between the protrusions, and the upper surface of the protrusion is filled to form a gap in the tank. Provided with a recess for positioning the filler
The bottom structure of a storage / penetration tank for rainwater and the like.

Images