JP2008133598A - Rainwater storage and penetration tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide rainwater storage and penetration facility capable of storing the rainwater stored as water without polluting it and having sufficient amount of penetration. <P>SOLUTION: The storage and penetration tank 1 in the rainwater storage and penetration facility has a penetration tank 12 provided with a rainwater penetrating function and a storage tank 11 provided with a rainwater storing function. The storage tank 11 is arranged inside the penetration tank 12, and an overflowing water inflow pipe capable of conducting overflowing water of the rainwater in the storage tank 11 into the penetration tank 12 is connected with its upper part. A plurality of water remaining members 14 provided continuously on the right and left sides in the vertical direction is provided in the inside of the storage and penetration tank 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an underground buried rainwater storage and penetration tank installed for the purpose of rainwater use and prevention of inundation damage.

  The rainwater storage and penetration tank temporarily stores rainwater and gradually infiltrates the stored rainwater into the ground. Conventional rainwater storage and penetration tanks are not only for storing rainwater and the like, but also have a penetration function, and have been formed by drilling holes in a portion that becomes a penetration tank or using a porous concrete member. For this reason, there is a problem that it takes time and labor to process the storage permeation tank, and a long construction period is required for the construction, resulting in an increase in cost.

  Conventionally, in order to satisfy the different functions of the rainwater storage function and the permeation function in one tank, the lower part of the storage infiltration tank is configured as a storage area, and the upper part is configured as an infiltration area. Facilities are proposed.

For example, in the rainwater storage and infiltration facility described in Patent Literature 1, a plurality of unit skeleton members are stacked in the vertical and vertical and horizontal directions to form a space holding skeleton, and from the bottom of the space formed by the space holding skeleton. The middle of the periphery is covered with a non-permeable lining layer, and the inside of the non-permeable lining layer in the space is a rainwater storage portion, and the upper portion is a rainwater infiltration portion. The upper rainwater infiltration part is formed by disposing crushed stone on the slope, and is configured such that rainwater permeates through this crushed stone layer.
Japanese Patent No. 3651973

  In the rainwater storage and infiltration facilities as described above, the rainwater infiltration part is formed by arranging crushed stones. Depending on the size of the gap between the crushed stones, fine sand and soil can be transmitted. There is a risk that water may flow backward from outside the tank. Then, since muddy water infiltrates into the rainwater storage section at the bottom, sand and soil are mixed into the rainwater stored and contaminated with rainwater. When using rainwater, these foreign substances must be removed. Will occur.

  In addition, the storage and penetration tank has a structure that divides the storage part and the penetration part without changing the material that it constitutes, so it is formed by excavating the ground in a stepped manner, which requires labor and time for excavation and processing. There is also a problem that it is complicated and requires a long construction period, and costs increase.

  Usually, the amount of rainwater or the like penetrating into the ground is calculated by multiplying the permeability coefficient of the ground by a size effect. Here, the dimensional effect is obtained by multiplying the ratio of the infiltration water depth by the ratio of the infiltration area.

  Therefore, the depth of the stored water and the size of the infiltration area greatly affect the infiltration capacity (infiltration amount per hour), and the infiltration only with the upper rainwater infiltration part as in the above-mentioned conventional example earns sufficient infiltration amount. It turns out that it is a disadvantageous structure.

  Therefore, the present invention has been made in view of the above problems, and allows rainwater stored as water to be stored without being contaminated, and has a sufficient amount of infiltration. Provide facilities.

  In order to achieve the above-described object, the present invention is a rainwater storage and penetration facility for storing rainwater and the like in a storage and penetration tank buried in the ground and allowing rainwater and the like to penetrate into the ground through the storage and penetration tank. The storage and permeation tank has a permeation tank having a permeation function such as rainwater, and a storage tank having a storage function such as rainwater, and the storage tank is disposed inside the permeation tank. It is characterized by.

  According to this configuration, the storage permeation tank has the storage tank disposed inside the permeation tank, so that it is possible to secure a sufficient amount of rainwater permeation surface in the permeation tank and increase the permeation amount of rainwater. it can.

  Further, in the rainwater storage and infiltration facility having the above-described configuration, an overflow inflow pipe that guides the overflow water to the infiltration tank is connected to the upper part of the storage tank, so that the overflow water of the rainwater in the storage tank can be introduced into the infiltration tank. The rainwater can be efficiently stored and infiltrated.

  Further, in the rainwater storage and infiltration facility of the present invention, the storage and infiltration tank may be internally provided with a plurality of water-stagnation members arranged vertically and horizontally, thereby ensuring the required pressure resistance of the storage and infiltration tank space. Thus, the above-ground part can be used effectively and freely, and rainwater can be stored smoothly.

  According to the rainwater storage and infiltration facility of the present invention configured as described above, it is possible to store rainwater stored as water utilization without contamination, and a sufficient infiltration amount with a structure advantageous for rainwater infiltration It is possible to improve the flood control effect and to improve the workability and reduce the installation cost.

  Hereinafter, the best mode for carrying out the rainwater storage and penetration facility according to the present invention will be described with reference to the drawings.

  1 to 5 show examples of the rainwater storage and penetration facility of the present invention, FIG. 1 is an explanatory view schematically showing the rainwater storage and penetration facility, FIG. 2 is an explanatory top view of FIG. 1, and FIG. 3 is a rainwater storage and penetration facility. FIG. 4 is an explanatory top view schematically showing another embodiment of the rainwater storage and penetration facility, and FIG. 5 is a cross sectional explanatory view of FIG. It is.

  In each cross-sectional view, in order to make the drawings easy to see, hatching or the like indicating a cross-section is omitted from the illustrated constituent members.

  This rainwater storage and penetration facility temporarily stores rainwater when heavy rain falls, and has an outflow suppression effect that prevents the river flow rate from rapidly increasing by allowing the rainwater to penetrate into the ground. And the rainwater etc. which were stored can also be utilized as watering for planting, water for car washing, water for emergency and water for fire prevention in an emergency.

  The storage and infiltration tank 1 of the rainwater storage and infiltration facility is provided, for example, in an excavation part formed by digging the ground into a flat rectangular shape. Yes. The bottom surface of the storage permeation tank 1 is a flat surface.

  As shown in FIGS. 1 and 2, a storage tank 11 and a permeation tank 12 are provided in the storage permeation tank 1 of the rainwater storage and permeation facility. Of these, the infiltration tank 12 has a function of infiltrating rainwater and the like into the ground, and is provided with a size over the entire inside of the excavation part, and becomes an inner peripheral surface (boundary surface with the ground) of the tank. The bottom and side surfaces are covered with a water permeable sheet 121. The permeation tank 12 is provided with a number of water-stagnation members 14 that are provided with guidance means for guiding rainwater or the like in a desired direction by gravity and a rainwater flow.

  The water-stagnation member 14 is formed from a synthetic resin material such as polyethylene, polypropylene, vinyl chloride, polyethylene terephthalate, or a waste plastic material thereof. For example, as shown in FIG. And an inclined plate part 142 provided with a water gradient. Then, the water-stagnation member 14 is housed in the permeation tank 12 by sandwiching and stacking connecting members (not shown) in the connecting portion 141. The water-stagnation member 14 is arranged in the infiltration tank 12 so that, for example, rainwater guided by the inclined plate portion 142 becomes a water flow and gradually falls from the gap between the inclined plate portions 142.

  The storage tank 11 is disposed inside the permeation tank 12 so as to partition the inside of the permeation tank 12. That is, as shown in FIG. 3, the storage tank 11 is provided so that the permeation tank 12 surrounds the outside of the side surface and the bottom surface of the storage tank 11.

  The storage tank 11 has a function of storing rainwater or the like. For example, similarly to the infiltration tank 12, a water-stagnation member 14 formed of a rigid resin material is connected vertically and horizontally, and its outer peripheral surface is water-impervious. A storage space such as rainwater is formed by being covered with the sheet.

  In addition, a rainwater inflow rod 15 connected to the ground surface is provided in the upper part of the storage tank 11. Further, the rainwater inflow pipe 15 is connected with a rainwater inflow pipe 16 for guiding rainwater and the like from a water collecting tank and a sand settling tank disposed in the vicinity.

  As shown in FIG. 3, contaminant removal means 17 is provided at the inflow portion from the rainwater inflow pipe 16 to the storage tank 11. For example, a filter or a screen may be used as the removing means. Thereby, the foreign substance contained in the rainwater led to the storage tank 11 can be removed.

  Further, as shown in FIG. 1, a rainwater discharge pipe 18 is connected to the downstream side of the rainwater inflow pipe 16 so that the overflow water of the storage and permeation tank 1 can be discharged to a public rainwater pipe or overflow basin. It has become.

  The storage tank 11 is provided with a water intake pipe 19 for using rainwater stored in the storage tank 11. One end of the intake pipe 19 is disposed at the lower portion of the storage tank 11, and the other end is connected to the outside of the storage permeation tank 1.

  In the storage and penetration tank 1, an overflow inflow pipe 13 that guides overflow water such as rainwater in the storage tank 11 to the penetration tank 12 is connected between the storage tank 11 and the penetration tank 12. In the illustrated embodiment, the overflow inflow pipe 13 is branched and connected so as to be located below the connection portion of the rainwater inflow pipe 16 in the rainwater inflow tank 15, and the end thereof is connected to the upper part of the permeation tank 12. ing.

  In the rainwater storage and penetration facility having such a configuration, rainwater flowing through the rainwater inflow pipe 16 flows into the rainwater inflow tank 15 and the storage tank 11 from the inflow portion via the removing means 17 such as a filter. When the storage tank 11 is filled with rainwater that has flowed in, the water level rises and the rainwater that flows into the rainwater inflow tank 15 is led from the overflow inflow pipe 13 to the infiltration tank 12.

  Rainwater that has flowed into the infiltration tank 12 penetrates into the ground from the bottom and side surfaces of the infiltration tank 12 because the infiltration tank 12 is covered with the water permeable sheet. When the amount of rainwater flowing into the infiltration tank 12 increases, the water level of the infiltration tank 12 increases, and a larger amount of rainwater penetrates into the ground.

  Inflow rainwater exceeding the permeation capacity in the infiltration tank 12 flows to the rainwater inflow tank 15 and is discharged from the rainwater discharge pipe 18 to a public rainwater pipe or overflow tank. In addition, when rainwater is used, a pumping means is provided which can suck in the rainwater stored in the storage tank 11 by connecting a water intake pump to a water intake pipe 19 installed in the storage tank 11.

  Moreover, the rainwater storage penetration facility of this invention may be comprised so that it may illustrate in FIG. That is, the storage tank 11 of the storage permeation tank 1 may be composed of a synthetic resin tank in which pressure resistance is ensured. For the synthetic resin tank, for example, a tank or a container formed of a synthetic resin material such as polyethylene can be used as it is.

  In this case, since the storage tank 11 is a synthetic resin tank, unlike the embodiment of FIG. 1, rainwater is effectively stored without forming a storage space by laminating the water-stagnation member 14 inside the storage tank 11. It becomes possible to do. Therefore, the storage and penetration tank 1 of this form is suitable for a rainwater storage and penetration facility in a relatively small-scale facility such as a detached house.

  As described above, the rainwater storage and penetration facility is configured, so that it is possible to store rainwater stored as water in the storage and penetration tank 1 without contamination, and it is advantageous to provide a sufficient amount of penetration. Can take a simple structure. That is, since the storage tank 11 is covered with a water-impermeable (water-impervious) material, rainwater can be stored efficiently and mixing of muddy water from the outside of the storage tank can be avoided. And since the osmosis | permeation tank 12 becomes all the 5 surfaces of a bottom face and a side surface, it is a permeation surface of rainwater, Compared with the conventional structure, an osmosis | permeation area can be increased significantly and also the storage tank arrange | positioned inside Since the water volume increases by the volume of 11 and the water level naturally increases, the permeation capacity per unit area can be significantly increased.

  As a result, when the planned runoff suppression amount of rainwater determined by the sum of the reservoir volume and the infiltration amount is determined, the rainwater can be reduced without complicating the shape of the storage infiltration tank by improving the infiltration capacity in this way. Since it is possible to reduce the size of the entire storage and penetration facility, it is possible to reduce the space required for installing the rainwater storage and penetration facility and to reduce the construction cost.

  In the rainwater storage and penetration facility that stores rainwater and the like in a storage and penetration tank buried in the ground and infiltrates rainwater and the like through the storage and penetration tank, the present invention contaminates rainwater stored as water utilization. It can utilize suitably for storing without doing.

It is explanatory drawing which shows typically the example of the rainwater storage penetration facility which concerns on this invention. It is explanatory drawing seen from the upper surface of the rainwater storage penetration facility of FIG. It is explanatory drawing which shows typically the flow of the rainwater in the rainwater storage penetration facility which concerns on this invention by the AA cross section in FIG. It is upper surface explanatory drawing which shows typically other embodiment of the rainwater storage penetration facility which concerns on this invention. It is a cross-sectional explanatory drawing of the rainwater storage penetration facility of FIG. It is a perspective view which shows an example of the water retention member in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage permeation tank 11 Storage tank 12 Permeation tank 121 Permeable sheet 13 Overflow inflow pipe 14 Water retaining member 141 Connection part 142 Inclined plate part 15 Rainwater inflow trough 16 Rainwater inflow pipe 17 Removal means 18 Rainwater discharge pipe 19 Intake pipe

Claims (3)

  A rainwater storage and penetration facility for storing rainwater and the like in a storage and penetration tank buried in the ground and allowing rainwater and the like to penetrate into the ground through the storage and penetration tank. A rainwater storage and infiltration facility comprising an infiltration tank having a function and a storage tank having a storage function of rainwater or the like, wherein the storage tank is disposed inside the infiltration tank.   The rainwater storage and permeation tank according to claim 1, wherein an overflow inflow pipe for guiding overflow water to the permeation tank is connected to an upper portion of the storage tank.   The rainwater storage and infiltration facility according to claim 1 or 2, wherein the storage and infiltration tank is internally provided with a plurality of water-stagnation members provided continuously in the vertical and horizontal directions.

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