JP2015183493A - Rainwater storage infiltration facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a rainwater storage infiltration tank even to a foundation having high ground water level and to install the rainwater storage infiltration tank easily with a simple configuration.SOLUTION: A rainwater storage infiltration facility 1 includes a rainwater storage infiltration tank 10 which collects rainwater in a subsurface having a permeable layer G2 in a lower layer of a low-permeable layer G1 and outflows and infiltrates the rainwater to the underground. In the rainwater storage infiltration tank 10, a plurality of infiltration wells 20 which are continuously installed in the permeable layer G2 is provided. In the rainwater storage infiltration tank 10, through holes 13 through which the infiltration wells 20 are inserted are provided. Between the through holes 13 and infiltration wells 20, clearances S2 are provided. The infiltration wells 20 have a double pipe structure consisting of outer tubes 21 and inner tubes 22 in which a plurality of through holes are formed in peripheral surfaces. Between the outer tubes 21 and the inner tubes 22, a permeable sheet 23 is arranged.

Description

  The present invention relates to a rainwater storage and penetration facility.

  Conventionally, as measures against concentrated heavy rain, rainwater is temporarily stored, and thereafter, a rainwater storage and penetration tank for spilling outside or gently penetrating into the ground is buried underground. Such a rainwater storage and penetration tank is a groove-shaped collection member having an assembly member that fits vertically and a bottom plate and side plates that are erected from both side ends of the assembly member. A sand receiving frame is provided, and the sand collecting frame is fixed to the lower assembly member by an attachment member (see, for example, Patent Document 1).

JP 2009-2160 A

  However, in the case where the permeable layer of the target ground is in the lower layer of the hardly permeable layer and the permeable layer is in a deep position, it is necessary to dig deeply until the rainwater storage infiltration tank reaches the permeable layer, It was difficult and there was room for improvement.

  The present invention has been made in view of the above-described problems, and even when the water-permeable layer is deep, a rainwater storage and penetration tank can be installed near the ground surface and can be easily constructed. The purpose is to provide infiltration facilities.

  In order to achieve the above object, a rainwater storage and infiltration facility according to the present invention collects rainwater in a basement having a permeable layer below a hardly permeable layer, and has a stormwater storage and infiltration tank that flows out or permeates into the ground. In the permeation facility, the rainwater storage permeation tank is provided with a permeation well connected to the permeable layer, and the rainwater storage permeation tank is provided with a through hole through which the permeation well is inserted. And a gap between the seepage well and the seepage well.

  According to the rainwater storage and penetration facility according to the present invention, rainwater is collected in a rainwater storage and penetration tank installed in the basement, and the rainwater is further continuously connected from the rainwater storage and penetration tank to a lower-permeability layer. The well can be guided into the permeable layer, and rainwater can penetrate into the permeable layer. Therefore, the rainwater storage and penetration tank can be installed in a shallow ground near the ground surface, and the penetration capability as rainwater storage and penetration equipment can be obtained by extending the tubular penetration well from the rainwater storage and penetration tank to the permeable layer. Can do.

Furthermore, in the present invention, since the rainwater inflow capacity is increased by the rainwater storage and penetration tank having a large internal space, it is possible to guide rainwater on the ground surface to the basement in a short time, and further to permeate the permeable layer by the above-described penetration well. it can.
In this way, rainwater in the rainwater storage and infiltration tank can be infiltrated into the permeable layer through the infiltration well, so that the rainwater storage and infiltration tank is in contact with the permeable layer even when the permeable layer is deep in the ground. There is no need to dig into the ground and embed it in the ground, and there is an advantage that the construction becomes easy.

Moreover, after installing a seepage well and performing backfilling in advance, the seepage well is inserted into the through hole of the rainwater storage and penetration tank, whereby the rainwater storage and penetration tank and the seepage well can be easily connected. At this time, since a gap is formed between the through-hole and the penetration well, it is possible to absorb the positional deviation generated during the construction by the gap, and there is an advantage that the installation work is facilitated.
Furthermore, since the seepage well is inserted into the through hole and is not fixed to each other, the rainwater storage seepage tank is installed so that it can move up and down with respect to the seepage well. Can respond to settlement.

  Moreover, in the rainwater storage and infiltration facility according to the present invention, the infiltration well has a double tube structure including an outer tube and an inner tube in which a plurality of through holes are formed on a peripheral surface, and the outer tube and the inner tube. It is preferable that a water-permeable sheet is disposed between the two.

In this case, the rainwater in the seepage well communicated with the rainwater storage and penetration tank can be permeated into the external permeable layer through the permeable sheet.
Moreover, since the water permeable sheet is arranged on the inner surface side of the outer pipe, it is possible to prevent earth and sand from flowing into the seepage well from the through hole of the outer pipe, and to suppress clogging of the seepage well. it can.

  Further, in the rainwater storage and infiltration facility according to the present invention, the rainwater storage and infiltration tank is provided with an earth and sand separation mechanism for separating the earth and sand mixed with the inflowing rainwater, and the lower surface of the earth and sand separation mechanism and the upper end of the infiltration well A clearance in the vertical direction is preferably provided between the two.

In this case, the earth and sand mixed in the rainwater stored in the rainwater storage and infiltration tank is separated by the earth and sand separation mechanism, and a clearance is provided between the lower surface of the earth and sand separation mechanism and the upper end of the seepage well. Only rainwater that does not contain earth and sand can be allowed to flow into the seepage well from the clearance. Therefore, the inflow of earth and sand to the seepage well is prevented, the clogging of the seepage well can be suppressed, and the infiltration ability as the rainwater storage and infiltration facility can be maintained for a long time.
Moreover, since the earth and sand separation mechanism is directly above the upper end of the seepage well, the installation space can be kept small.

  According to the rainwater storage and penetration facility of the present invention, the rainwater storage and penetration tank can be installed near the ground surface even when the permeable layer is deep, and the construction can be easily performed.

It is a side view which shows the structure of the rainwater storage penetration | invasion installation by embodiment of this invention. It is an AA arrow directional view shown in FIG. 1, Comprising: It is a front view of a rainwater storage penetration tank. It is a figure which shows the connection part of a rainwater storage penetration tank and a penetration well, Comprising: (a) is the top view, Comprising: The BB arrow line view shown in FIG.3 (b), (b) is a longitudinal cross-section. FIG. It is an enlarged view of the connection part shown to Fig.3 (a). It is a principal part enlarged view of the seepage well shown in FIG.3 (b).

  Hereinafter, a rainwater storage and penetration facility according to an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 10 in FIG. 1 indicates a rainwater storage and penetration tank that collects rainwater in the underground having a permeable layer below the hardly permeable layer, and flows out or permeates into the ground in the rainwater storage and penetration facility 1 of the present embodiment. Yes. The rainwater storage and penetration tank 10 includes an upper assembly member 2 and a lower assembly member 3 that are fitted vertically, and a groove-shaped sand collecting frame 4 (sediment separation mechanism) provided in the lower assembly member 3. I have.
The bottom 12 of the rainwater storage and penetration tank 10 is provided with a through-hole 13 that is inserted through a seepage well 20 described later with a lateral gap S2 (see FIGS. 5 and 6).

Here, in the ground G where the rainwater storage and penetration tank 10 is installed, a water-permeable layer G1 such as a silt layer and a water-permeable layer G2 such as a gravel layer are laminated from the upper layer to the lower layer. The upper layer portion of the hardly water-permeable layer G1 is referred to as a surface layer portion G0, and the upper surface of the groundwater level W is located on the surface layer portion G0, and in this embodiment, the foundation board 11 of the rainwater storage and infiltration tank 10 is at the same level as the groundwater level W. It is being constructed.
The rainwater storage and penetration tank 10 is formed of a plastic material, and the base board 11 is formed of a layer of crushed stone. The through hole 13 through which the seepage well 20 is inserted is formed in the base plate 11 of the rainwater storage and penetration tank 10 together with the bottom portion 12 described above.

  As shown in FIG. 1, the upper assembling member 2 and the lower assembling member 3 are made of synthetic resin such as polypropylene formed by injection molding, for example, and are arranged side by side along a desired direction. Moreover, it has the storage space which stores rainwater in each of these multiple sets of assembly members 2 and 3 by combining in piles.

Hereinafter, the arrangement direction in one direction is referred to as “length direction X”. The assembly members 2 and 3 can be connected in the longitudinal direction Y (up and down direction) by fitting, and are arranged without being connected in the length direction X. It is also possible to connect the assembly members 2 and 3 adjacent to each other in the length direction X by an appropriate connection means.
Here, in the following description, a direction perpendicular to the length direction X in plan view and perpendicular to the horizontal direction with respect to the receiving frame axis is defined as a width direction W (see FIG. 2).

  The sand collecting frame 4 is a concave long frame having a bottom plate and side plates erected from both side ends thereof, and is an upper assembly member 2 and a lower assembly member 3 positioned at the lowest stage in the rainwater storage and penetration tank 10. It is provided in between. And the sand collection frame 4 accumulates the earth and sand which flowed in with rainwater, and the frame frame axis is directed in the direction along the length direction X over the plurality of lower assembly members 3 arranged in the length direction X. It is arranged to extend. This sand collection frame 4 has a function for separating earth and sand mixed in inflowing rainwater.

Further, as shown in FIG. 1, a plurality of (four in this embodiment) seepage wells 20, 20,... Connected from the rainwater storage seepage tank 10 to the permeable layer G <b> 2 are installed in a substantially vertical direction. ing.
A clearance S <b> 1 is provided between the lower surface of the sand collection frame 4 and the upper end 20 c of the seepage well 20 to allow water to enter the seepage well 20. Thereby, the sand collection frame 4 captures the earth and sand, and the inflow of earth and sand to the seepage well 20 is prevented.
The clearance S1 in the vertical direction between the sand collection frame 4 and the seepage well 20 may be opened at the time of installation, or even if the sand collection frame 4 and the seepage well 20 are in contact with each other, the through hole 13 is provided. You may provide a notch and a hole so that a clearance may be partially opened with respect to the protrusion part of the penetration well 20 which protrudes upward.

  As shown in FIGS. 4 to 6, the seepage well 20 has a double tube structure including an outer tube 21 and an inner tube 22, and a structure in which a water permeable sheet 23 is disposed between the outer tube 21 and the inner tube 22. It has become. In the through hole 13 between the bottom 12 of the rainwater storage and penetration tank 10 and the foundation board 11, the seepage well 20 is arranged between the pipe outer peripheral portion of the seepage well 20 via a gap S <b> 2. The length dimension (dimension in the depth direction) of the seepage well 20 is preferably such that the lower end 20a is in the water permeable layer G2, and can be arbitrarily set. Although the magnitude | size of the said clearance gap S2 can be set suitably, it is set to 1 mm or more-40 mm or less, for example, More preferably, it is 10 mm-40 mm. If it is smaller than 1 mm, it is difficult to insert the seepage well 20 into the through hole 13 in the bottom 12 of the water storage seepage tank 10, and in particular, when the seepage well 20 is inclined from the vertical direction, the through hole 13 and the seepage well 20. May interfere with the installation of the lower assembly member. On the other hand, if it is larger than 40 mm, surrounding crushed stones and earth and sand may enter the rainwater storage and penetration tank 10 and the penetration well 20.

  For example, a steel pipe or a vinyl chloride resin pipe can be adopted as the outer pipe 21, and a plurality of outer through holes 21a (see FIGS. 3 and 5) penetrating in the pipe thickness direction are formed. The inner tube 22 can be made of the same material as the outer tube 21. For example, the inner tube 22 has a small diameter and is coaxial with the outer tube 21, and has a plurality of inner through holes 22 a penetrating in the tube thickness direction. . In addition, the outer side through-hole 21a and the inner side through-hole 22a are provided in the range located in the water-permeable layer G2. The outer through hole 21a and the inner through hole 22a may have any number of holes and may be disposed at the same position as viewed from the circumferential direction or may be disposed at a shifted position. Further, the outer through hole 21a and the outer through hole 22a may be inclined from the tube thickness direction.

  The water permeable sheet 23 is disposed on the inner surface side of the outer tube 21 and is provided for the purpose of preventing earth and sand from flowing into the penetration well 20 from the outer tube through hole 21a. As a member of the water-permeable sheet 23, for example, a polyester long fiber nonwoven fabric or a woven fabric can be adopted.

According to the rainwater storage and penetration facility described above, the following operational effects are obtained.
That is, as shown in FIG. 1, in the rainwater storage and penetration facility A of the present embodiment, rainwater is collected in a rainwater storage and penetration tank 10 installed underground, and the rainwater is further collected from the rainwater storage and penetration tank 10. It is possible to guide the rainwater into the permeable layer G2 by guiding it into the permeable layer G2 by the seepage well 20 connected to the permeable layer G2 below G1. Therefore, the rainwater storage and penetration tank 10 can be installed in a shallow ground near the ground surface, and the tubular penetration well 20 is extended from the rainwater storage and penetration tank 10 to the permeable layer G2, so that the rainwater storage and penetration equipment A is provided. Penetration capacity can be obtained.

Furthermore, in this embodiment, since the rainwater inflow capability is increased by the rainwater storage and penetration tank 10 having a large internal space, the rainwater on the ground surface is guided to the basement in a short time, and the permeable well G2 is further introduced by the penetration well 20 described above. Can penetrate.
As described above, since rainwater in the rainwater storage and penetration tank 10 can be permeated into the permeable layer G2 through the seepage well 20, the rainwater storage and penetration tank 10 is permeable to water even when the permeable layer is located deep in the ground. There is an advantage that construction is easy because it is not necessary to dig into the layer G2 and embed it in the ground.

Moreover, in this Embodiment, after installing the seepage well 20 in advance and performing backfilling, the upper end 20b of the seepage well 20 is inserted into the through-hole 13 of the rainwater storage and penetration tank 10, so that the rainwater storage and penetration is achieved. The tank 10 and the penetration well 20 can be easily connected. At this time, since the gap S2 is formed between the through hole 13 and the penetration well 20, it is possible to absorb the positional deviation generated during the construction by the gap S2, and there is an advantage that the installation work is facilitated. .
Moreover, the rainwater storage permeation tank 10 is installed so that the rainwater storage permeation tank 10 can move up and down with respect to the seepage well 20 by inserting the upper portion 20b of the seepage well 20 into the through hole 13 and not fixing them. Therefore, it can respond to the settlement of the rainwater storage and penetration tank 10 after installation.

In addition, since the water permeable sheet 23 is disposed between the outer tube 21 and the inner tube 22, rainwater in the seepage well 20 communicating with the rainwater storage and infiltration tank 10 is infiltrated into the water permeable sheet 23 to externally transmit the water permeable layer. Can penetrate into G2.
Further, since the water permeable sheet 23 is disposed on the inner surface side of the outer pipe, it is possible to prevent earth and sand from flowing into the seepage well 20 from the through hole 21a of the outer pipe 21, and the seepage well 20 is clogged. Can be suppressed.

  In addition, when installing a seepage well in which the permeable sheet 23 is wound around the outer periphery in the soil, the permeable well 23 is smaller than the outer diameter of the seepage well so that the surrounding permeable sheet 23 is not caught during the insertion of the seepage well. It is necessary to dig a hole with an excessive diameter and insert a seepage well around which the water-permeable sheet 23 is wound. On the other hand, with the structure of the present embodiment, the outer tube 21 is inserted into a hole having substantially the same diameter as the outer tube 21, and then the inner tube 22 around which the water permeable sheet 23 is wound is inserted into the outer tube 21. Or the water-permeable sheet | seat 23 made cyclic | annular should just be inserted in the clearance gap between the outer tube | pipe 21 and the inner tube | pipe 22, and workability | operativity can be improved.

Further, in the present embodiment, the earth and sand mixed in the rainwater stored in the rainwater storage and penetration tank 10 is separated by the sand collection frame 4, and further, a clearance is provided between the lower surface of the sand collection frame 4 and the upper end 20 c of the seepage well 20. Since S1 is provided, only rainwater that does not contain earth and sand can be allowed to flow into the seepage well 20 from the clearance S1. Therefore, inflow of earth and sand into the seepage well 20 can be prevented, clogging of the seepage well 20 can be suppressed, and the infiltration ability as the rainwater storage and infiltration facility 10 can be maintained for a long time.
Moreover, since the sand collection frame 4 is directly above the upper end 20c of the seepage well 20, the installation space can be kept small.

  As described above, in the rainwater storage and penetration facility according to the present embodiment, the rainwater storage and penetration tank 10 can be installed near the ground surface G0 even when the permeable layer G2 is deep, and the construction can be easily performed. .

  As mentioned above, although embodiment of the rainwater storage infiltration installation by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

  Further, the number of seepage wells 20, the outer diameters and lengths of the outer tube 21 and the inner tube 22, the outer tube through hole 21a, the inner tube through hole 22a, and the like are not limited to the present embodiment. And it can set suitably according to the conditions of the target ground which installs rainwater storage penetration equipment 1. Furthermore, the permeation well 20 is not limited to a double tube structure including an outer tube 21 and an inner tube 22, and may be a single tube. Therefore, the configuration in which the water permeable sheet 23 is provided is not particularly limited, and may be omitted.

  Further, the shape and configuration of the rainwater storage and penetration tank 10 are not limited to the above-described embodiment.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 Rainwater storage and penetration equipment 2 Upper assembly member 3 Lower assembly member 4 Sand collection frame (sediment separation mechanism)
DESCRIPTION OF SYMBOLS 10 Rainwater storage penetration tank 12 Bottom part 13 Through-hole 20 Permeation well 20a Lower end 20b Upper part 20c Upper end 21 Outer pipe 21a Outer pipe through hole 22 Inner pipe 22a Inner pipe through hole 23 Permeable sheet G0 Surface layer part G1 Impervious water layer G2 Permeable layer S1 Clearance S2 Clearance W Groundwater level

Claims (3)

A rainwater storage and infiltration facility comprising a rainwater storage and infiltration tank that collects rainwater in the basement having a permeable layer below the hardly permeable layer, and flows or penetrates into the ground,
The rainwater storage and penetration tank is provided with a penetration well connected to the permeable layer,
The rainwater storage and penetration tank is provided with a through hole through which the penetration well is inserted,
A rainwater storage and infiltration facility having a gap between the through hole and the infiltration well.   The seepage well has a double tube structure including an outer tube and an inner tube having a plurality of through holes formed on a peripheral surface, and a water-permeable sheet is disposed between the outer tube and the inner tube. The rainwater storage and infiltration facility according to claim 1.   The rainwater storage and penetration tank is provided with a soil and sand separation mechanism for separating earth and sand mixed in inflowing rainwater, and a vertical clearance is provided between the lower surface of the soil and sand separation mechanism and the upper end of the seepage well. The rainwater storage and infiltration facility according to claim 1 or 2, wherein

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