JP2014234643A - Rainwater storage infiltration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater storage infiltration system which does not give an adverse effect to a building.SOLUTION: A rainwater storage infiltration facility 4A having rainwater storage infiltration function ia buried into a ground adjacent to a side face of a building 2. In the rainwater storage infiltration facility 4A, a water barrier sheet 45 is arranged on a first side face 41 facing the building 2 to form a water barrier face 43. A water permeable sheet 46 is arranged on a second side face 42 not facing the building 2 to form a water permeable face 44, rainwater is prevented from being discharged to the building 2 side, the side face of the building 2 and the first side face 41 are made almost parallel to each other in plan view, and a section between the building 2 and the rainwater storage infiltration facility 4A becomes a simple shape in plan view, thus facilitating the construction.

Description

  The present invention relates to a rainwater storage and penetration system that temporarily stores rainwater and permeates it into the ground, and more particularly to a rainwater storage and penetration system that is suitable when installed adjacent to a building or the like.

  Conventionally, a storage and penetration facility for rainwater has been proposed in which rainwater is temporarily stored, and the stored rainwater is gently infiltrated into the ground to be drained. In the storage and penetration facility, for example, as disclosed in Patent Document 1, a water-permeable reinforcing sheet is laid in a ground tank portion formed by excavation, and a plurality of storage structures are vertically and horizontally and vertically arranged thereon. A storage tank is formed by stacking.

  In addition, as disclosed in, for example, Patent Document 2, when embedding a rainwater permeation product in which a hole or slit for allowing rainwater to permeate is embedded, A construction method has been proposed.

  Furthermore, as disclosed in, for example, Patent Document 3, a rainwater storage device has been proposed in which a large number of synthetic resin water storage structural materials are accumulated underground and surrounded by a water permeable sheet.

JP 2013-44212 A JP-A-10-168984 JP-A-11-71789

  However, in the conventional storage and penetration facilities as disclosed in Patent Documents 1 to 3, when trying to install the storage and penetration facilities etc. in a narrow space such as between the building and the land boundary, Adverse effects such as rainwater discharged into the ground from the storage and penetration facilities, etc., reaching the periphery of the foundation of the building, causing the ground around the foundation to loosen, or moisture rising from the ground inside the foundation and damaging the building There was a risk of affecting.

  On the other hand, if the infiltration area in the storage infiltration facility is reduced in order to reduce the influence of rainwater that has infiltrated into the ground on the building, the amount of infiltration of rainwater will eventually decrease. In addition, there is a limit to securing a sufficient distance between the storage penetration facility and the building due to the site area.

  Therefore, an object of the present invention is to provide a rainwater storage and infiltration system that can be sufficiently stored temporarily and can be appropriately installed in a narrow space such as between a building and a land boundary without damaging the building and its foundation. .

  The present invention is a rainwater storage and infiltration system in which rainwater flowing out from a rain gutter disposed in a building is temporarily stored and infiltrated into the ground, and is adjacent to the side of the building. The rainwater storage and penetration facility is embedded in the ground, and the rainwater storage and penetration facility has an internal space into which rainwater flowing out from the rain gutter is introduced. A first side surface facing the building and a second side surface not facing the building are formed at least, and the first side surface is disposed between the building and the second side surface. The amount of rainwater infiltration discharged from the internal space into the ground through the second side surface is greater than the amount of rainwater infiltration through the second space into the ground through the rainwater storage infiltration System.

  In such a configuration, the “rainwater penetration amount discharged from the internal space into the ground” is a comparison of the amount of rainwater discharged from the internal space of the rainwater storage and penetration facility to the outside of the rainwater storage and penetration facility per unit area. It is a thing. That is, if the first side surface and the second side surface are simply the same area, the amount of rainwater discharged from the second side in the same time rather than the amount of rainwater discharged from the first side in a predetermined time. The amount of will be greater.

  By setting it as this structure, the direction of the rainwater discharged | emitted from the 1st side surface in the position relatively near a building rather than the 2nd side surface can be decreased. As a result, even if the rainwater storage and penetration facility is buried in the ground adjacent to the side of the building, the penetration of rainwater into the ground is preferentially performed from the second side, so that the area around the foundation of the building The influence of moisture on the building and the looseness of the ground can be reduced.

  Moreover, it is desirable that the side surface of the building and the first side surface are arranged substantially parallel to each other in plan view.

  By adopting such a configuration, the distance between the building and the first side surface is kept constant, so that the section between the building and the rainwater storage and penetration facility has a simple shape in plan view, and the construction is easy. Become.

  Furthermore, the first side surface is a water-impervious surface through which rainwater introduced into the interior space of the rainwater storage and penetration facility cannot penetrate into the ground, and the second side surface is the rainwater storage and penetration facility. It is desirable that the water-permeable surface allows rainwater introduced into the interior space to penetrate into the ground.

  By setting it as this structure, the penetration of rainwater from the first side surface into the ground is suppressed. Thereby, the influence of the looseness of the ground around the foundation in a building and moisture is suppressed more reliably.

  Here, the rainwater storage and penetration facility includes the rainwater storage and penetration body having the internal space, and having a water permeable portion for discharging rainwater in the internal space into the ground. Is constituted by a water-impervious coating member that covers all or part of the rainwater storage and permeation body, and the second side surface is configured by a water-permeable coating member that covers all or part of the rainwater storage and permeation body. It is desirable.

  By setting it as this structure, the said rainwater storage penetration facility which has a 1st side surface and a 2nd side surface can be comprised using a water-impervious coating member and a water-permeable coating member. This constitutes the first aspect of the present invention by simply applying a water-impervious coating member to a required portion of a rainwater storage / penetration facility which has been conventionally covered with a water-permeable coating member. Therefore, a desired function can be obtained without the need for drastically changing the conventional method for constructing a rainwater storage and infiltration system.

  Further, the rainwater storage and penetration facility is provided with a superposed portion in which a part of the water-permeable covering member constituting the second side surface is overlapped on the surface and / or the back surface of the water-impervious covering member. It is desirable.

  With this configuration, it is possible to arrange the water-impervious coating member and the water-permeable coating member without any gaps while ensuring the non-penetrating function of the first side surface and the penetrating function of the second side surface. It becomes.

  The rainwater storage and penetration facility includes a plurality of rainwater storage and penetration bodies having the internal space, and a plurality of rainwater storage and penetration bodies provided on a peripheral wall for discharging rainwater of the internal space into the ground. It is desirable that the stored penetrants are juxtaposed along the side of the building.

  By adopting such a configuration, even if there are a plurality of rainwater storage and penetration bodies, a rainwater storage and penetration facility can be installed along the side of the building, and the rainwater storage and penetration system is suitably applied to a narrow area. be able to.

  Even if it installs adjacent to a building, the rainwater storage penetration system of the present invention can control suitably the influence of the looseness of the ground around the foundation of a building, and moisture to a building.

The outline top view of the rainwater storage penetration system concerning an example. Explanatory drawing which shows the longitudinal cross-section of the rainwater storage penetration system shown in FIG. Explanatory drawing which shows the longitudinal cross-section of a rainwater storage penetration facility. Explanatory drawing which shows the longitudinal cross-section of the rainwater storage penetration facility concerning the modification 1. FIG.

  Hereinafter, the embodiment which actualized the rainwater storage penetration system of the present invention is described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIGS. 1 to 3, the rainwater storage and penetration system 1 includes a rainwater storage and penetration facility 4 </ b> A embedded in the ground around the building 2, and rainwater flowing out from the rain gutter 2 a of the building 2 is the rainwater. A rainwater route X introduced into the storage and penetration facility 4A is constructed.

  The rainwater storage and penetration facility 4A includes a plurality of box-shaped rainwater storage and penetration bodies 8, and the plurality of rainwater storage and penetration bodies 8 are juxtaposed along the side surface of the building 2 (specifically, the outer edge of the foundation 20). As a result, the overall shape is elongated in plan view. Thus, in the rainwater storage and penetration facility 4A, a first side surface 41 facing the building 2 and a second side surface 42 not facing the building 2 are formed. The building 2 and the second side surface 42 The first side surface 41 is disposed between the two. Therefore, in the present embodiment, the side surface of the building 2 and the first side surface 41 are arranged substantially parallel in plan view, and the first side surface 41 and the second side surface 42 are In the plan view, they are arranged substantially in parallel.

  As shown in FIG. 2, the rainwater storage penetrator 8 has an internal space Y in which rainwater can be temporarily stored by forming peripheral walls on the top, bottom, left, and right, and has a structure with sufficient load resistance. Yes. In addition, the peripheral wall of the rainwater storage penetrator 8 is provided with a large number of water-permeable portions (water-permeable holes) 8a for discharging rainwater introduced into the internal space Y to the outside. For example, the rainwater storage penetrator 8 preferably has a length of about 50 cm, a width of 50 cm, and a height of about 100 cm.

  Further, an inspection vertical pipe 10 whose upper end is exposed to the ground surface is connected to the upper wall of any rainwater storage penetrant 8, and thereby an inspection port 10 a that connects the ground space and the inside of the rainwater storage penetrator 8. Is formed. In normal times, it is desirable that a shielding lid is attached to the inspection port 10a.

  In addition, a rainwater trough 6 is disposed in a rainwater path X that connects the rain gutter 2a in the building 2 and the rainwater storage and penetration facility 4A. On the peripheral wall of the rainwater 6, an inflow port 3 into which rainwater from the rain gutter 2 a flows, and a flow in which the rainwater flowing in from the inflow port 3 flows out to the rainwater storage penetrating body 8 through the inspection vertical pipe 10. An exit 5 and an upper end opening 9 for maintenance facing the ground are provided. Further, a filter 7 is detachably attached to the outlet 5 in the rainwater trough 6. Further, a shielding lid is attached to the upper end opening 9.

  A top plate (not shown) is placed on the rainwater storage and permeation body 8, and a sheet (covering member) 40 is covered on the outer periphery of the rainwater storage and permeation body 8. More specifically, as shown in FIG. 3, the sheet 40 includes a water-impervious sheet 45 and a water-permeable sheet 46, and specifically, the water-permeable sheet 46 is substantially horizontal in the rainwater storage and penetration body 8. The upper and lower surfaces and the substantially vertical second side surface 42 side surface are covered, and the water-impervious sheet 45 covers the substantially horizontal upper and lower surfaces and the substantially vertical first side surface 41 side surface of the rainwater storage and penetration body 8. doing. Therefore, the water shielding sheet 45 is exposed on the first side surface 41 of the rainwater storage and penetration facility 4A, and the water permeable sheet 46 is exposed on the second side surface 42. For this reason, the first side surface 41 becomes a water-impervious surface 43 from which rainwater is not discharged from the internal space Y of the rainwater storage and permeation body 8, whereas the second side surface 42 is separated from the internal space Y of the rainwater storage and permeation body 8 by rainwater. Is a water permeable surface 44 from which water is discharged. The water-impervious sheet 45 and the water-permeable sheet 46 are superposed on the upper and lower surfaces of the rainwater storage and permeation body 8, and the water-permeable sheet 46 is superposed on the back surface of the water-impervious sheet 45. A portion 47 is provided. Thereby, both the sheets 45 and 46 are arrange | positioned around the rainwater storage penetration body 8 without gap.

  As the water-impervious sheet 45, for example, a sheet material having a water-shielding performance such as a synthetic resin sheet or a rubber sheet is preferably used. In addition, as the water permeable sheet 46, for example, a sheet material having water permeability such as a synthetic resin fiber or a woven fabric or a nonwoven fabric of natural fiber is preferably used.

  In the rainwater storage and infiltration system 1, the rainwater flowing down the rain gutter 2a is introduced into the rainwater trough 6 and then into the rainwater storage and infiltration body 8 of the rainwater storage and infiltration facility 4A. And temporarily infiltrate into the ground only from the water permeable surface 44 of the second side surface 42.

  In the above configuration, since rainwater is not discharged from the first side surface 41 that is relatively closer to the building 2 than the second side surface 42, the rainwater storage and penetration facility 4A is adjacent to the side surface of the building 2 and is underground. Even if buried, the looseness of the ground around the foundation 20 of the building 2 and the influence of moisture on the building 2 can be reduced. Further, since the plurality of rainwater storage penetrants 8 are arranged side by side so as to have an elongated shape in plan view along the foundation 20 of the building 2, for example, between adjacent buildings or Even in a narrow area such as between a building and a land boundary, it can be sufficiently constructed as the rainwater storage and penetration facility 4A. Furthermore, since the side surface of the building 2 and the first side surface 41 are arranged substantially parallel in plan view, the distance between the building 2 and the first side surface 41 is kept constant, The section between the rainwater storage and penetration facility 4A has a simple shape in plan view, and the construction becomes easy. Further, since the rainwater storage and penetration facility 4A is arranged close to the building 2, rainwater from the rain gutter 2a attached along the wall surface of the building 2 is introduced into the rainwater storage and penetration facility 4A without waste. The rainwater path X will not be excessively long.

Moreover, according to FIG. 4, the rainwater storage penetration facility 4B concerning a modification is demonstrated.
In the rainwater storage and penetration facility 4B, the rainwater storage and penetration body 8 is covered with a water-permeable sheet 46, and further covered with a water-permeable sheet 45, and the water-impervious portion of the portion serving as the second side surface 42 is covered. By partially excising the sheet 45, a part of the water permeable sheet 46 disposed on the back side of the water-impervious sheet 45 is exposed to the outside to form a water permeable surface 44.

  Even in such a configuration, the rainwater flowing down the rain gutter 2a is introduced into the rainwater storage and penetration body 8 of the rainwater storage and penetration facility 4B and temporarily stored in the internal space Y, and the water permeable surface of the second side surface 42 is also provided. It gradually penetrates into the ground from 44 alone.

The rainwater storage and penetration facility 4B is preferably constructed according to the following procedure.
First, a required location is excavated, the water-impervious sheet 45 and the water-permeable sheet 46, and the rainwater storage and permeation body 8 are disposed at the excavation location, and the entire periphery of the rainwater storage and permeation body 8 is covered with the water-permeable sheet 46. Next, the water-impervious sheet 45 is entirely covered from above, and then only the part of the water-impervious sheet 45 that becomes the second side surface 42 is partially cut with a cutter or the like, A part of the water-permeable sheet 46 disposed is exposed to the outside to form a water-permeable surface 44, and the soil is backfilled.

  According to this construction method, the area of the water permeable surface 44 can be appropriately determined on site according to the situation of the construction site, the construction work of the rainwater storage and penetration facility 4B is simplified, and the construction can be performed quickly as a whole.

  The embodiments described so far can be appropriately changed without departing from the gist of the present invention. For example, the rainwater storage and penetration facility 4A, 4B can be applied to any known configuration, and includes a bottom plate in which grooves are formed, and two side plates having an L-shaped cross section that face each other on the bottom plate, The bottom plates of the rainwater storage penetrator 8 constituted by the top plate arranged on the side plate may be connected to each other, or the prone rainwater storage penetrator 8 made of resin and integrally molded may be used. For example, it may be connected vertically and horizontally. The rainwater storage penetrator 8 does not have to be strictly rectangular in plan view, and may be a non-rectangular shape including a first side surface 41 and a second side surface 42 that are substantially parallel to each other. Moreover, the 1st side surface 41 or the 2nd side surface 42 does not necessarily need to be a plane, and may be a curved surface. Further, the water-impervious surface 43 of the first side surface 41 is not necessarily configured by the water-impervious sheet 45, and a water-impervious plate member or the like is disposed, or the first side surface 41 side of the rainwater storage penetrant 8 is made of a water-impervious material. It may be molded. In addition, the first side surface 41 does not need to be strictly water-blocked, and may have a configuration in which the amount of rainwater permeation per unit area is smaller than that of the water-permeable surface 44 of the second side surface 42. In short, there may be infiltration of rain water to the extent that the building 2 side is not substantially adversely affected. Further, the water permeable surface 44 of the second side surface 42 does not necessarily need to be configured by the water permeable sheet 46, for example, a rubber sheet or the like having a hole opened at a predetermined location, or the second side surface of the rainwater storage penetrator 8. The 41 side may be molded with a water-permeable material. Further, in the superposed portion 47 of the water-impervious sheet 45 and the water-permeable sheet 46, the water-permeable sheet 46 may of course be disposed on the surface of the water-impervious sheet 45. Further, the position of the overlapping portion 47 can be appropriately determined on the outer periphery of the rainwater storage and penetration facilities 4A and 4B, and is not limited to the above-described embodiment. A configuration in which the polymerization portion 47 is not formed is also included in the present invention. Further, the water permeable surface 44 may be disposed on the upper surface or the lower surface of the rainwater storage penetrator 8.

  The rainwater storage penetrator 8 need not be plural, and may be a single substance. Moreover, the material and dimensions of each member such as the rainwater storage penetrant 8 or the rainwater trough 6 are not particularly limited, but those made of resin may be used in consideration of ease of manufacture or processing, transportation, and construction work. preferable. In addition, consideration can be given to the environment by using recycled PP, recycled PET, or the like. Further, by actively using lightweight members, it is possible to manually install the rainwater storage and penetration system 1 according to the present invention even in a narrow area where it is difficult to use heavy machinery.

DESCRIPTION OF SYMBOLS 1 Rainwater storage penetration system 2 Building 2a Rain gutter 4A, 4B Rainwater storage penetration facility 8 Rainwater storage penetration body 40 Sheet (covering member)
41 1st side surface 42 2nd side surface 43 Water-impervious surface 44 Water-permeable surface 45 Water-impervious sheet (water-impervious coating member)
46 Water-permeable sheet (water-permeable covering member)
47 Polymerization part

Claims (6)

A rainwater storage and penetration system in which rainwater flowing out from a rain gutter arranged in a building is temporarily stored and penetrated into the ground,
A rainwater storage and penetration facility buried in the ground adjacent to the side of the building,
The rainwater storage and penetration facility has an internal space into which rainwater flowing out from the rain gutter is introduced, and the outer peripheral surface of the rainwater storage and penetration facility has a first side facing the building and does not face the building. A second side surface is formed, and the first side surface is disposed between the building and the second side surface,
The amount of rainwater permeation discharged from the internal space into the ground through the second side surface is greater than the amount of rainwater permeation discharged from the internal space into the ground through the first side surface. Rainwater storage and penetration system. The rainwater storage and infiltration system according to claim 1, wherein the side surface of the building and the first side surface are arranged substantially parallel to each other in plan view. The first side surface is a water-impervious surface incapable of penetrating rainwater introduced into the interior space of the rainwater storage and penetration facility into the ground,
The rainwater storage and infiltration system according to claim 1 or 2, wherein the second side surface is a water permeable surface through which rainwater introduced into the interior space of the rainwater storage and infiltration facility can penetrate into the ground. The rainwater storage and penetration facility is
A rainwater storage penetrating body having the inner space, and having a water permeable portion for discharging rainwater in the inner space into the ground;
The first side surface is constituted by a water-impervious coating member that covers all or part of the rainwater storage penetrant,
The rainwater storage and infiltration system according to claim 3, wherein the second side surface is constituted by a water permeable covering member that covers all or part of the rainwater storage and infiltration body. In the rainwater storage and penetration facility,
The rainwater storage and infiltration system according to claim 4, wherein a superposed portion in which a part of the water-permeable covering member constituting the second side surface is overlapped is provided on a front surface and / or a back surface of the water-impervious covering member. . The rainwater storage and penetration facility is
A plurality of rainwater storage penetrants having the inner space, and having a water permeable portion provided on a peripheral wall for discharging rainwater in the inner space into the ground;
The rainwater storage and penetration system according to any one of claims 1 to 5, wherein the plurality of rainwater storage and penetration bodies are juxtaposed along a side surface of the building.

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