JP2011247014A

JP2011247014A - Rainwater outflow restraining facility

Info

Publication number: JP2011247014A
Application number: JP2010122635A
Authority: JP
Inventors: Hirohisa Yamada; 浩久山田
Original assignee: Sekisui Plastics Co Ltd
Current assignee: Sekisui Kasei Co Ltd
Priority date: 2010-05-28
Filing date: 2010-05-28
Publication date: 2011-12-08

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater outflow restraining facility with a storage and permeation tank 20 that is buried along a road 1 having a gradient in the route direction and has an approximately the same gradient as of the road, capable of enhancing an effective rainwater storage rate of the storage and permeation tank 20 and allowing the storage and permeation tank 20 to store nearly equal amounts of rainwater over the entire region.SOLUTION: A rainwater outflow restraining facility with a storage and permeation tank 20 that is buried along a road 1 having a gradient in the route direction and has an approximately the same gradient as of the road, which allows rainwater to flow in the storage and permeation tank 20 from an inflow basin 40 arranged at an upper part of the gradient and the inflow rainwater to flow down toward a lower part of the gradient, comprises a plurality of partitioned tanks 20a to 20d with impermeable partitions 22 to divide the storage and permeation tank 20 in the rainwater flow direction. Each of the partitioned tanks 20a to 20d communicates with each other through an opening 23 formed at a lower part of the partition 22.

Description

本発明は、地中に埋設した貯留浸透槽に雨水を一時的に流入させることで、大量の降雨があったときに、道路側溝から雨水が道路などに流出するのを抑制し、また、中小河川の排水能力を上回る規模の雨水が河川に流れ込むのを防止できるようにした雨水流出抑制施設に関する。 The present invention allows rainwater to temporarily flow into a storage infiltration tank buried in the ground, thereby preventing rainwater from flowing out from a road side groove to a road or the like when there is a large amount of rainfall. The present invention relates to a rainwater outflow control facility that can prevent rainwater having a scale exceeding the drainage capacity of a river from flowing into the river.

上記のような雨水流出抑制施設において、貯留浸透槽の上流側には管理桝を兼ねた集水桝が配置され、道路側溝などからの雨水を集水桝に集水した後、貯留浸透槽内に流入させるようにしている。また、貯留浸透槽の下流位置には管理桝を兼ねた流出桝が配置される場合が多く、その場合、貯留浸透槽から排出される雨水は流出桝に流入し、そこに形成されたオリフィス開口の開口面積に規制された量の雨水が、河川に流れ出るようにされている。 In the rainwater outflow control facilities as described above, a catchment basin also serving as a management basin is placed upstream of the storage infiltration tank. After collecting rainwater from the road side ditch into the catchment basin, It is made to flow into. In addition, an outflow basin that also serves as a management tub is often arranged at the downstream position of the storage and infiltration tank. In that case, rainwater discharged from the storage and osmosis tank flows into the outflow basin, and an orifice opening formed there The amount of rain water regulated by the opening area of the river is allowed to flow into the river.

流入桝からの流入量と流出桝からの流出量の差分の雨水が、貯留浸透槽内に一時的に貯留されて、貯留浸透槽が貯留槽の場合には貯留された雨水が時間をかけて河川に流出していき、浸透槽あるいは貯留浸透槽の場合は長い時間をかけて地中にも浸透していく。そのような雨水流出抑制施設の一例が特許文献１に記載されている。 The rainwater of the difference between the inflow from the inflow trough and the outflow from the outflow trough is temporarily stored in the storage permeation tank. If the storage permeation tank is a storage tank, the stored rainwater takes time. It flows into the river, and in the case of infiltration tanks or storage infiltration tanks, it penetrates into the ground over a long time. An example of such a rainwater outflow suppression facility is described in Patent Document 1.

現在、施工あるいは提案されている雨水流出抑制施設は、道路勾配を持たない道路すなわち地表面がほぼ水平である道路に沿って貯留浸透槽を地中に埋設する形態のものが普通であり、路線方向に勾配を持つ道路に沿って貯留浸透槽を埋設して雨水流出抑制施設を構築することまでは、十分な検討がなされていない。 Currently, rainwater runoff control facilities that have been constructed or proposed usually have storage infiltration tanks embedded in the ground along roads that have no road gradient, that is, roads that have a substantially horizontal surface. Sufficient consideration has not been made until a rainwater outflow control facility is constructed by burying a storage infiltration tank along a road with a gradient in the direction.

特許文献２には、容器状部材を縦横かつ上下に連結したブロック構造体を地中に埋設して表層部に浸透した水をブロック構造体に集めて貯留部となすようにした雨水流出抑制施設が記載されており、その一実施の形態として、貯留部をなすブロック構造体に遮水部材を上下にかつブロック構造体の延出方向に等間隔に配置するようにしたものが記載されている。この形態では、ブロック構造体に貯まった水が遮水部材の上端より高い水位となると遮水部材を乗り越えて隣接する区画室に流入し、以下、順次この乗り越えを繰り返すことで、水がブロック構造体の延出方向にある排水口へ向かって流れるようにされている。 Patent Document 2 discloses a rainwater outflow control facility in which a block structure in which container-like members are connected vertically and horizontally is buried in the ground, and water that has permeated the surface layer portion is collected in the block structure to serve as a storage portion. As an embodiment of the block structure, there is described a structure in which water blocking members are arranged at equal intervals in the extending direction of the block structure in the block structure forming the storage portion. . In this mode, when the water accumulated in the block structure reaches a level higher than the upper end of the water shielding member, the water passes over the water shielding member and flows into the adjacent compartment. It is designed to flow toward the drain outlet in the direction of body extension.

そして、この形態のブロック構造体では、ブロック構造体の下の地盤が傾斜しているような場合でも、上流側ではブロック構造体内の水が低部へ流れてしまい、上流側の下方の地盤に水が浸透しないなどの欠点が生じない旨の記載されている。 In the block structure of this form, even if the ground below the block structure is inclined, the water in the block structure flows to the lower part on the upstream side, and the ground on the lower side on the upstream side. It is stated that there are no drawbacks such as the infiltration of water.

また、地中に設置する貯留浸透槽として、樹脂材料からなる貯水空間形成部材を多段に積み上げ、その周囲を透水シートあるいは遮水シートで覆って貯留浸透槽とすることも知られている（例えば、特許文献３、４等）。 Further, as a storage permeation tank installed in the ground, it is also known that a water storage space forming member made of a resin material is stacked in multiple stages, and its periphery is covered with a water permeable sheet or a water shielding sheet to form a storage permeation tank (for example, Patent Documents 3 and 4).

特開２００９−５２３０４号公報JP 2009-52304 A 特開２０００−１６０６６７号公報JP 2000-160667 A 特開２００８−８０７５号公報JP 2008-8075 A 特開２００９−２４４４７号公報JP 2009-24447 A

前記したように、これまでの雨水流出抑制施設では、路線方向に勾配を持つ道路に沿って貯留浸透槽を埋設するようにしたものについての検討は十分にはされていない。今後、都市部などにおいて雨水流出抑制施設に対する需要がますます高くなることが予測され、その場合、前記した路線方向に勾配を持つ道路に沿って貯留浸透槽を埋設する形態の雨水流出抑制施設を構築することが現実に起こり得る。 As described above, in the conventional rainwater outflow control facilities, the investigation of the storage and infiltration tank embedded along the road having a gradient in the route direction has not been sufficiently conducted. In the future, it is expected that demand for rainwater spill control facilities will increase in urban areas. In such a case, a stormwater spill control facility in the form of burying a storage infiltration tank along a road with a gradient in the above-mentioned route direction will be developed. Building can actually happen.

図７は、路線方向に勾配を持つ道路に沿って貯留浸透槽を埋設する場合での雨水流出抑制施設の一例を示している。図７において、道路１は水平面に対して角度αの勾配をもっており、この道路の路線方向に沿って、かつ道路勾配αとほぼ同じ勾配を持って貯留浸透槽２が埋設されている。貯留浸透槽２の勾配上部には流入桝３が配置され、貯留浸透槽２の勾配下部には流出桝４が配置されている。流出桝４は越流堰５を備えており、越流堰５の下部にはオリフィス６が形成されている。なお、図７で、７は流入桝３への雨水流入部であり、８は流出桝４での雨水流出部である。 FIG. 7 shows an example of a rainwater outflow suppression facility in the case where a storage infiltration tank is embedded along a road having a gradient in the route direction. In FIG. 7, the road 1 has a slope of an angle α with respect to the horizontal plane, and the storage permeation tank 2 is embedded along the road direction of the road and substantially the same slope as the road slope α. An inflow tub 3 is disposed at the upper slope of the storage and permeation tank 2, and an outflow tub 4 is disposed at the lower slope of the storage and permeation tank 2. The outflow gutter 4 includes an overflow dam 5, and an orifice 6 is formed in the lower part of the overflow dam 5. In FIG. 7, 7 is a rainwater inflow portion to the inflow raft 3, and 8 is a rainwater outflow portion in the outflow raft 4.

側溝などから流入桝３に流入した雨水は貯留浸透槽２に入り込み、そこから流出桝４に流入する。そして、流入する雨水の量が少ない場合には、越流堰５の下部に形成されたオリフィス６を通って流出桝４の外に排出される。雨水の流入量が大きくなると、貯留浸透槽２および流出桝４内での水位が次第に上がっていき、流出桝４内での雨水の水位が越流堰５の上端を超えると、超えた量の雨水すなわちオーバーフローした雨水が流出桝４の外に排出される。 Rainwater that has flowed into the inflow trough 3 from a gutter or the like enters the storage permeation tank 2 and then flows into the outflow trough 4. And when there is little amount of rainwater which flows in, it is discharged out of the outflow basin 4 through the orifice 6 formed in the lower part of the overflow dam 5. When the inflow amount of rainwater increases, the water level in the storage infiltration tank 2 and the outflow basin 4 gradually rises, and when the rainwater level in the outflow basin 4 exceeds the upper end of the overflow weir 5, Rain water, that is, overflowed rain water is discharged out of the outflow gutter 4.

貯留浸透槽２が水平に埋設されている雨水流出抑制施設では、前記越流堰５の上端の高さを貯留浸透槽２の上端近傍の高さとしておくことにより、貯留浸透槽２のほぼすべての空間を貯水空間として利用することができる。しかし、図７に示すように、勾配αをもって貯留浸透槽２が埋設された雨水流出抑制施設では、流出桝４内の雨水の水位が越流堰５の上端の高さに達した時点で、貯留浸透槽２内には、多くの雨水が貯留されていない空間が存在することとなり、その雨水が貯留されない空間は、勾配αに比例して大きくなる。すなわち、勾配αで貯留浸透槽２が埋設された雨水流出抑制施設では、貯留浸透槽２の有効雨水貯水率が小さくなるのを避けられない。 In the rainwater outflow control facility in which the storage and penetration tank 2 is buried horizontally, the height of the upper end of the overflow weir 5 is set to the height near the upper end of the storage and penetration tank 2, so that almost all of the storage and penetration tank 2 is placed. This space can be used as a water storage space. However, as shown in FIG. 7, in the rainwater outflow control facility in which the storage and infiltration tank 2 is buried with a gradient α, when the rainwater level in the outflow basin 4 reaches the height of the upper end of the overflow weir 5, A space in which a lot of rainwater is not stored exists in the storage permeation tank 2, and the space in which the rainwater is not stored becomes larger in proportion to the gradient α. That is, in the rainwater outflow suppression facility in which the storage permeation tank 2 is embedded with the gradient α, it is inevitable that the effective rainwater storage rate of the storage permeation tank 2 is reduced.

特許文献２に記載のように、貯留浸透槽２の勾配方向に遮水壁を設けて貯留浸透槽２内を勾配方向に複数の分割槽に分割し、上流側の分割槽の水位が前記遮水壁の上端より高い水位となったときに、遮水壁を乗り越えて隣接する下流側の分割槽内に流入させるように構成することにより、貯留浸透槽２内の無駄な空間、すなわち雨水が貯留されない空間を小さくすることができ、貯留浸透槽２の有効活用が図れる。しかし、単に遮水壁を設けて貯留浸透槽２内を複数の分割槽に分割した形態では、上流側の分割槽に遮水壁で規制される量の雨水が貯留された後でないと、下流側の分割槽に雨水が流れ込むことができないので、雨量が少ないときには、上流側の分割槽のみに雨水が貯留され、下流側の分割槽は空の状態となっていることが起こり、貯留浸透槽２内での雨水の貯留状態が均一にならないという不都合が生じるのを避けられない。 As described in Patent Document 2, a water-impervious wall is provided in the gradient direction of the storage and permeation tank 2 to divide the inside of the storage and permeation tank 2 into a plurality of divided tanks in the gradient direction, and the water level of the upstream division tank is the above-described When the water level is higher than the upper end of the water wall, the waste water in the storage and permeation tank 2, that is, rainwater, is formed by flowing over the impermeable wall and flowing into the adjacent downstream dividing tank. The space that is not stored can be reduced, and the storage penetration tank 2 can be effectively utilized. However, in the form in which the storage and penetration tank 2 is simply divided into a plurality of divided tanks by providing a water-impervious wall, the downstream divided tank is not after the amount of rainwater regulated by the water-impervious wall is stored. Since rainwater cannot flow into the split tank on the side, when there is little rain, rainwater is stored only in the split tank on the upstream side, and the split tank on the downstream side is empty. The inconvenience that the storage state of rainwater in 2 is not uniform is unavoidable.

また、貯留槽の場合、雨量が少ないときには、貯留槽内に留まることなく雨水の全量が流出桝４から河川などに流れ出ることが、必要時により多くの雨水を貯留できることから望ましいが、遮水壁を単に形成した貯留貯留槽では、最上流側の分割槽は常時雨水が貯留されている状態となりやすく、貯留浸透槽全体としての緊急時の有効貯水量が低減する。 In addition, in the case of a storage tank, it is desirable that when the rainfall is low, it is desirable that the entire amount of rainwater flow out from the outflow basin 4 to a river or the like without remaining in the storage tank. In the storage and storage tank in which the storage tank is simply formed, the uppermost divided tank is likely to be in a state where rainwater is always stored, and the effective amount of emergency water storage as the entire storage and penetration tank is reduced.

本発明は、上記のような事情に鑑みてなされたものであり、路線方向に勾配を持つ道路に沿って貯留浸透槽が道路勾配とほぼ同じ勾配を持って埋設されている形態の雨水流出抑制施設において、貯留浸透槽の有効雨水貯水率を向上させることができ、かつ貯留浸透槽の全域にわたってほぼ等しく雨水を貯留できるようにした雨水流出抑制施設を提供することを課題とする。 The present invention has been made in view of the circumstances as described above, and the rainwater outflow suppression in a form in which the storage and permeation tank is embedded with a slope substantially the same as the road gradient along a road having a gradient in the route direction. It is an object of the present invention to provide a rainwater outflow suppression facility that can improve the effective rainwater storage rate of a storage and infiltration tank and can store rainwater almost equally over the entire area of the storage and infiltration tank.

本発明による地中に埋設された貯留浸透槽を持つ雨水流出抑制施設は、貯留浸透槽が路線方向に勾配を持つ道路に沿って道路勾配とほぼ同じ勾配を持って埋設されており、雨水は勾配上部に設けた流入桝から前記貯留浸透槽に流入し、流入した雨水は貯留浸透槽を勾配下部方向へ流下するようになっており、そこにおいて、貯留浸透槽は雨水の流れ方向に非透水性の隔壁で複数の分割槽に分割されており、各分割槽同士は隔壁下部に形成した開口によって互いに連通していることを特徴とする。 The rainwater outflow control facility having a storage seepage tank buried in the ground according to the present invention is embedded with a slope substantially the same as the road gradient along the road where the storage seepage tank is inclined in the route direction. The rainwater that flows into the storage and infiltration tank from the inflow trough provided at the upper part of the gradient flows down the storage and infiltration tank toward the lower part of the gradient, where the storage and infiltration tank is impermeable to the rainwater flow direction. The dividing tank is divided into a plurality of divided tanks, and the divided tanks communicate with each other through an opening formed in the lower part of the partition wall.

本発明による雨水流出抑制施設では、非透水性の隔壁で分割された複数の分割槽は、隔壁下部に形成した開口によって互いに連通した状態となっており、流入桝から貯留浸透槽内に流入する雨水は、すべての分割槽内にほぼ均等に行き渡りやすくなる。そして、流入する雨水量が多くなると、各分割槽の水位はほぼ等しい速度で隔壁の上部まで上昇する。そのために、貯留浸透槽の使用領域が部分的に偏ることはなく、かつ、貯留浸透槽全体の有効貯水率も向上する。 In the rainwater outflow control facility according to the present invention, the plurality of divided tanks divided by the non-permeable partition walls are in communication with each other through an opening formed in the lower part of the partition walls, and flow into the storage permeation tank from the inflow tank. Rainwater tends to spread almost evenly in all the dividing tanks. And if the amount of rainwater which flows in increases, the water level of each division tank will rise to the upper part of a partition at a substantially equal speed. Therefore, the use area of the storage permeation tank is not partially biased, and the effective water storage rate of the entire storage permeation tank is improved.

さらに、各分割槽同士は隔壁下部に形成した開口によって互いに連通していることで、貯留浸透槽内にたまった土砂やごみ等の固形物を、逆噴射ノズルやバキュームノズルを用いて除去することも可能となり、貯留浸透槽全体のメンテナンスも容易となる。 Furthermore, each divided tank communicates with each other through an opening formed in the lower part of the partition wall, so that solid matter such as earth and sand and dust accumulated in the storage and permeation tank can be removed using a reverse injection nozzle and a vacuum nozzle. It becomes possible, and the maintenance of the entire storage permeation tank becomes easy.

好ましい態様において、雨水流出抑制施設は、貯留浸透槽の勾配下部側に流出桝を備えており、前記流出桝は内部に越流堰を有しており、前記越流堰は下部にオリフィス開口を有していることを特徴とする。 In a preferred embodiment, the rainwater outflow control facility has an outflow basin on the lower slope side of the storage infiltration tank, the outflow basin has an overflow weir inside, and the overflow dam has an orifice opening in the lower part. It is characterized by having.

この態様では、雨量が少ないときには、貯留浸透槽に流入する雨水はすべて前記オリフィス開口を通って、河川等に流出することができ、貯留浸透槽内をほぼ空の状態としておくことができる。そのために、大量に降雨があったときの有効貯水量を大きく確保しておくことができる。 In this aspect, when the amount of rain is small, all rainwater flowing into the storage and penetration tank can flow out to the river and the like through the orifice opening, and the inside of the storage and penetration tank can be kept almost empty. Therefore, a large effective water storage amount can be secured when there is a large amount of rainfall.

好ましい態様において、雨水流出抑制施設は、流入桝に形成した貯留浸透槽への雨水流入口と各隔壁下部に形成した開口はほぼ一直線状に配列しており、すべての開口にわたるようにして開口内には樋部材は配置されていることを特徴とする。 In a preferred embodiment, the rainwater outflow control facility is configured so that the rainwater inlet to the storage infiltration tank formed in the inflow tank and the openings formed in the lower part of each partition are arranged substantially in a straight line so that all the openings are covered. Is characterized in that a collar member is arranged.

この態様では、雨量の少ないときには、すべての開口にわたるようにして配置した樋部材を利用して、雨水を円滑に貯留浸透槽の外へ送り出すことができ、また、樋部材を利用して、逆噴射ノズルやバキュームノズルをより容易に貯留浸透槽内に導入することができるので、貯留浸透槽全体のメンテナンスは一層容易となる。 In this aspect, when there is little rainfall, rainwater can be smoothly sent out of the storage and penetration tank by using the dredging member arranged so as to cover all the openings, and reversely by using the dredging member. Since the spray nozzle and the vacuum nozzle can be more easily introduced into the storage and permeation tank, the maintenance of the entire storage and permeation tank becomes easier.

好ましい態様において、雨水流出抑制施設は、各隔壁下部に形成した開口は勾配上部から勾配下部に向けて次第に開口面積が小さくなっていることを特徴とする。 In a preferred embodiment, the rainwater outflow suppression facility is characterized in that the opening formed in the lower part of each partition has an opening area gradually decreasing from the upper part of the gradient toward the lower part of the gradient.

この態様では、各分割槽内に雨水が貯水されるときの、各分割槽での水位の上昇速度を一層均一化することができる。 In this aspect, the rising speed of the water level in each divided tank when rainwater is stored in each divided tank can be made more uniform.

本発明によれば、貯留浸透槽を路線方向に勾配を持つ道路に沿ってかつ道路勾配とほぼ同じ勾配を持つようにして埋設している雨水流出抑制施設において、貯留浸透槽全体の有効貯水率を向上させることができ、かつ貯留浸透槽の全域にわたってほぼ等しく雨水を貯留できるようになる。 According to the present invention, in the rainwater outflow control facility in which the storage permeation tank is buried along a road having a gradient in the route direction so as to have substantially the same gradient as the road gradient, the effective water storage rate of the entire storage permeation tank The rainwater can be stored almost equally over the entire area of the storage infiltration tank.

本発明による雨水流出抑制施設の一例を路線方向に沿って示す概略図。Schematic which shows an example of the rainwater outflow suppression facility by this invention along a route direction. （ａ）は図１のａ−ａ線による断面図、（ｂ）は図１のｂ−ｂ線による断面図。(A) is sectional drawing by the aa line of FIG. 1, (b) is sectional drawing by the bb line of FIG. 本発明による雨水流出抑制施設の他の例を説明するための図２（ｂ）に相当する図。The figure corresponded in FIG.2 (b) for demonstrating the other example of the rainwater outflow suppression facility by this invention. 本発明による雨水流出抑制施設のさらに他の例を路線方向に沿って示す概略図。Schematic which shows the further another example of the rainwater outflow suppression facility by this invention along a route direction. 図１に示した雨水流出抑制施設が貯水状態にあるときを説明する図。The figure explaining when the rainwater outflow suppression facility shown in FIG. 1 is in a water storage state. 貯留浸透槽を形成する貯水空間形成部材の一例を説明する図。The figure explaining an example of the water storage space formation member which forms a storage penetration tank. 路線方向に勾配を持つ道路に沿って貯留浸透槽を埋設する形態の雨水流出抑制施設が貯水状態にあるときの例を説明する図。The figure explaining an example when the rainwater outflow suppression facility of the form which embeds a storage penetration tank along the road which has a gradient in a route direction is in a water storage state.

以下、図面を参照しながら、本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明による雨水流出抑制施設の一例を示す概略図であり、この例において、雨水流出抑制施設Ａ１は、路線方向に勾配を持つ道路１に沿って道路勾配αとほぼ同じ勾配を持って埋設されている貯留浸透槽２０と、貯留浸透槽２０の勾配上部に配置された流入桝４０と、貯留浸透槽２０の勾配下部に配置された流出桝５０とを備える。 FIG. 1 is a schematic diagram showing an example of a rainwater outflow control facility according to the present invention. In this example, the rainwater outflow control facility A1 has a gradient substantially the same as the road gradient α along the road 1 having a gradient in the route direction. The storage and permeation tank 20 embedded in the storage permeation tank 20, the inflow trough 40 disposed on the upper slope of the storage permeation tank 20, and the outflow trough 50 disposed on the lower slope of the storage permeation tank 20.

貯留浸透槽２０は、雨水を貯留できる貯留槽であってもよく、貯留した雨水を地中に浸透させる浸透槽であってもよい。図１に示す例では、貯留浸透槽２０は貯留槽としての機能を果たすようになっている。貯留浸透槽２０は、前記した特許文献３または４に記載されるような、従来知られたものであってよい。 The storage and penetration tank 20 may be a storage tank that can store rainwater, or may be a penetration tank that permeates the stored rainwater into the ground. In the example shown in FIG. 1, the storage and penetration tank 20 functions as a storage tank. The storage permeation tank 20 may be a conventionally known one as described in Patent Document 3 or 4 described above.

図１に示す貯留浸透槽２０は、図６に示す樹脂製の貯水空間形成部材３１を、９０度方向を変えながら多段に積み上げて形成されたものであり、図２（ａ）（ｂ）に示すように断面形状は矩形であり、道路１の路線方向に所要の長さを有している。また、貯留浸透槽２０の側面は遮水シート２１によって覆われている。 The storage permeation tank 20 shown in FIG. 1 is formed by stacking the resin water storage space forming member 31 shown in FIG. 6 in multiple stages while changing the direction by 90 degrees. As shown, the cross-sectional shape is rectangular and has a required length in the direction of the road 1. Further, the side surface of the storage and penetration tank 20 is covered with a water shielding sheet 21.

なお、図６に示す貯水空間形成部材３１は、前記した特許文献４に記載されるものであり、下端が開放された箱状部３２ａの複数個が間隔を空けながらＸ方向に配列した箱列３２が、Ｘ方向に直交するＹ方向に間隔を空けながら必要列数だけ配列した構成を基本的に備えている。必要な場合には、異なった大きさの複数個の貯水空間形成部材３１を箱列（凸部からなる列）３２の方向が同じ方向となるように寄せ集めて貯水空間形成部材３１とすることもできる。 The water storage space forming member 31 shown in FIG. 6 is described in Patent Document 4 described above, and a plurality of box-shaped portions 32a whose lower ends are opened are arranged in the X direction while being spaced apart from each other. 32 is basically provided with a configuration in which the necessary number of columns are arranged with an interval in the Y direction orthogonal to the X direction. If necessary, a plurality of water storage space forming members 31 of different sizes are gathered together so that the directions of the box rows (rows of rows) 32 are the same direction to form the water storage space forming member 31. You can also.

そして、貯水空間形成部材３１の多数枚を、前記箱列（凸部からなる列）３２の方向が交互に９０度に交差した姿勢で上下方向に積み上げることにより、貯留浸透槽２０とされる。図示の例で、貯留浸透槽２０は、道路１の勾配と同じ勾配に掘削された溝の底部を砕石のような基礎材９を敷き詰めて均平化し、その上に配置されている。 Then, a large number of the water storage space forming members 31 are stacked in the vertical direction in a posture in which the directions of the box rows (rows made of convex portions) 32 alternately intersect each other at 90 degrees to form the storage penetration tank 20. In the illustrated example, the storage infiltration tank 20 is leveled by spreading a base material 9 such as a crushed stone at the bottom of a groove excavated to the same gradient as the road 1, and disposed thereon.

この例で、貯留浸透槽２０は、最下位に配置した貯水空間形成部材３１における前記した箱列（凸部からなる列）３２、３２の間のＸ方向に延びる空間領域の向きが、路線方向と同じ方向となるようにして、地中に埋設されている。また、貯留浸透槽２０の路線方向の適所には、図２（ｂ）に示すように、貯留浸透槽２０の断面における一部の上部領域を除いた全領域を閉鎖するようにして、例えばポリオレフィンシート、ポリエチレンシート、ポリプロピレンシート、ポリウレタンシート、ＥＶＡ（エチレン−酢酸ビニル共重合体)シート、合成ゴムシートのような材料である非透水性材料からなる隔壁２２が、所要の間隔をおいて、所要の枚数だけ配置されている。なお、図示のものでは３枚の隔壁２２が示されるが、これに限らない。そして、各隔壁２２の下部における、前記した貯水空間形成部材３１の箱列（凸部からなる列）３２、３２の間のＸ方向に延びる空間領域のいずれか１つと一致する位置には、オリフィスとして機能する開口２３が形成されている。そして、各隔壁２２の下部に形成した前記開口２３は、ほぼ路線方向に一直線状に配列するようにされている。 In this example, the storage permeation tank 20 has the direction of the space region extending in the X direction between the box rows (rows made of convex portions) 32, 32 in the water storage space forming member 31 arranged at the lowest position. It is buried in the ground in the same direction as In addition, as shown in FIG. 2 (b), the storage permeation tank 20 is properly positioned in the route direction so as to close the entire area except for a part of the upper area in the cross section of the storage permeation tank 20, for example, polyolefin. A partition wall 22 made of a water-impermeable material such as a sheet, a polyethylene sheet, a polypropylene sheet, a polyurethane sheet, an EVA (ethylene-vinyl acetate copolymer) sheet, or a synthetic rubber sheet is required at a necessary interval. Are arranged. In the illustrated example, three partition walls 22 are shown, but the present invention is not limited to this. In the lower part of each partition wall 22, there is an orifice at a position that coincides with any one of the space regions extending in the X direction between the box rows (rows of convex portions) 32, 32 of the water storage space forming member 31 described above. Opening 23 that functions as The openings 23 formed in the lower part of each partition wall 22 are arranged substantially in a straight line in the route direction.

さらに、必須のものではないが、貯留浸透槽２０の路線方向全長にわたるようにして、前記箱列（凸部からなる列）３２、３２の間のＸ方向に延びる空間領域と各隔壁２２に形成した開口２３内を連続的に通過するようにして樋部材２４が配置されている。 Furthermore, although it is not essential, it is formed in each partition wall 22 and the space region extending in the X direction between the box rows (rows made of convex portions) 32, 32 so as to cover the entire length of the storage permeation tank 20 in the route direction. The eaves member 24 is arranged so as to continuously pass through the opened opening 23.

貯留浸透槽２０は、所要枚数の隔壁２２が配置されることによって、複数個（図示のものでは４個）の分割槽２０ａ〜２０ｄに分割され、分割した貯水空間となっている。ただし、各隔壁２２は貯留浸透槽２０の上端までは達していないので、隔壁２２の上端より上方では、貯水空間は連続した貯水空間となっている。また、各分割槽２０ａ〜２０ｄの下端部は前記した隔壁２２に形成した開口２３によって互いに連通している。 The storage and permeation tank 20 is divided into a plurality of (four in the illustrated example) divided tanks 20a to 20d by arranging the required number of partition walls 22 to form divided water storage spaces. However, since each partition wall 22 does not reach the upper end of the storage permeation tank 20, the water storage space is a continuous water storage space above the upper end of the partition wall 22. The lower ends of the division tanks 20a to 20d communicate with each other through the opening 23 formed in the partition wall 22 described above.

なお、貯留浸透槽２０に取り付ける前記隔壁２２は、後に記載するように、その数が多いほど貯留浸透槽２０の有効貯水率は向上する。しかし、一方において、貯留浸透槽２０の施工効率は低下する。貯留浸透槽２０の路線方向の長さと求められる有効貯水率とを考慮して、適数の枚数を選択すればよい。 In addition, the effective water storage rate of the storage permeation tank 20 improves, so that the said partition 22 attached to the storage permeation tank 20 has later the number. However, on the other hand, the construction efficiency of the storage permeation tank 20 is reduced. An appropriate number of sheets may be selected in consideration of the length of the storage permeation tank 20 in the route direction and the required effective water storage rate.

流入桝４０は、従来知られた流入桝であってよく、上面に管理用開口４１を有し、また、上方領域には雨水の入口４２を有しいている。雨水入口４２には、図示しない道路側溝などからの雨水流入管が接続される。流入桝４０は、図示されるように、その１つの側壁４３を貯留浸透槽２０の勾配上部側の端面に接するようにして配置されており、該側壁４３の前記貯留浸透槽２０の前記した樋部材２４が位置する部分には、貯留浸透槽２０への雨水流入口４４が形成されている。図示の例において、前記雨水流入口４４と各隔壁２２の下部に形成した開口２３は、ほぼ一直線状に配列した状態となっており、すべての開口にわたるようにして、該開口内には前記した樋部材２４は配置されている。また、前記側壁４３の貯留浸透槽２０の上位部に対応する位置に通気開口４５が形成されていて、該通気開口４５を通して貯留浸透槽２０の上方領域は大気に連通している。 The inflow rod 40 may be a conventionally known inflow rod, and has a management opening 41 on the upper surface and a rainwater inlet 42 in the upper region. The rainwater inlet 42 is connected to a rainwater inflow pipe from a road side groove (not shown). As shown in the figure, the inflow trough 40 is arranged so that one side wall 43 thereof is in contact with the end surface on the upper side of the gradient of the storage permeation tank 20, and the above-described persimmon of the storage permeation tank 20 on the side wall 43. A rainwater inflow port 44 to the storage permeation tank 20 is formed at a portion where the member 24 is located. In the example shown in the figure, the rainwater inlet 44 and the openings 23 formed in the lower part of each partition wall 22 are arranged in a substantially straight line. The collar member 24 is arranged. A ventilation opening 45 is formed at a position corresponding to the upper portion of the storage and penetration tank 20 on the side wall 43, and the upper region of the storage and penetration tank 20 communicates with the atmosphere through the ventilation opening 45.

流出桝５０も、従来知られた流出桝であってよい。図示のものでは、その１つの側壁５１を貯留浸透槽２０の勾配下部側の端面に接するようにして配置されており、該側壁５１の、前記貯留浸透槽２０に配置した前記した樋部材２４が位置する部位には、貯留浸透槽２０からの雨水が出るための雨水流出口５２が形成されている。また、前記側壁５１の貯留浸透槽２０の上位部に対応する位置には、通気開口５３が形成されており、該通気開口５３を通して貯留浸透槽２０の上方領域は大気に連通している。なお、５４は上面に形成された管理用開口である。 The spillway 50 may also be a conventionally known spillway. In the illustrated one, the one side wall 51 is arranged so as to be in contact with the end face on the lower gradient side of the storage permeation tank 20, and the above-mentioned saddle member 24 arranged in the storage permeation tank 20 of the side wall 51 is provided. A rainwater outflow port 52 through which rainwater from the storage permeation tank 20 comes out is formed at the position. A vent opening 53 is formed at a position corresponding to the upper portion of the storage permeation tank 20 on the side wall 51, and an upper region of the storage permeation tank 20 communicates with the atmosphere through the vent opening 53. Reference numeral 54 denotes a management opening formed on the upper surface.

流出桝５０は、貯留浸透槽２０に接する側壁５１と反対側の側壁５５に流出管５６を接続しており、流出桝５０内の雨水はそこを通して河川等に排出される。２つの側壁５１、５５の間には越流堰５７が立設されており、その上端は貯留浸透槽２０の上端近傍位置に達しており、流出桝５０の天板と越流堰５７の上端との間は、雨水越流空間とされている。また、越流堰５７の下方部にはオリフィスとして機能する開口５８が形成されている。 The outflow basin 50 is connected to an outflow pipe 56 on the side wall 55 opposite to the side wall 51 in contact with the storage and permeation tank 20, and rainwater in the outflow basin 50 is discharged to a river or the like therethrough. An overflow dam 57 is erected between the two side walls 51, 55, and the upper end of the overflow dam 57 reaches a position near the upper end of the storage infiltration tank 20. It is considered as a rainwater overflow space. In addition, an opening 58 that functions as an orifice is formed in the lower portion of the overflow weir 57.

上記の雨水流出抑制施設Ａ１での雨水貯留状態を説明する。流入桝４０には、図示しない道路側溝などからの雨水が雨水入口４２から流入する。流入した雨水は、流入桝４０に形成した雨水流入口４４のレベルに達すると、そこから、貯留浸透槽２０内に入り込んでいく。図示のものでは、雨水流入口４４には、前記のように樋部材２４の先端が位置しており、該樋部材２４は各隔壁２２の開口２３を通過するようにして配置されていて、その後端は流出桝５０の雨水流出口５２に達しているので、雨水の量が樋部材２４を越流しないで流下できる量の場合には、雨水は、そのまま流出桝５０まで流下する。 A rainwater storage state in the rainwater outflow suppression facility A1 will be described. Rainwater from a road gutter (not shown) flows into the inflow rod 40 from the rainwater inlet 42. When the inflowing rainwater reaches the level of the rainwater inlet 44 formed in the inflow rod 40, it enters the storage and penetration tank 20 from there. In the illustrated example, the tip of the eave member 24 is located at the rainwater inlet 44 as described above, and the eave member 24 is disposed so as to pass through the opening 23 of each partition wall 22. Since the end reaches the stormwater outlet 52 of the spillway 50, if the amount of rainwater is such that it can flow without overflowing the ridge member 24, the rainwater flows down to the spillway 50 as it is.

流出桝５０内に流入した雨水は、側壁５１と越流堰５７との間の空間に貯留され、越流堰５７の下方部に形成したオリフィス開口５８のレベルに達すると、そこを通って越流堰５７と側壁５５の間の空間に流下し、流出管５６から流出桝５０の外に排出される。 Rainwater that has flowed into the outflow basin 50 is stored in a space between the side wall 51 and the overflow weir 57 and reaches the level of the orifice opening 58 formed in the lower part of the overflow weir 57 and passes therethrough. It flows down to the space between the flow weir 57 and the side wall 55 and is discharged from the outflow pipe 56 to the outside of the outflow bottle 50.

雨水の量が次第に大きくなると、雨水は樋部材２４を越流するようになり、越流した雨水は貯留浸透槽２０内に一時的に貯留されるとともに、貯留浸透槽２０内での水位は次第に上昇する。水位の上昇とともに、貯留浸透槽２０内の空気は通気開口４５あるいは通気開口５３を通して外部に排出される。 As the amount of rainwater gradually increases, the rainwater flows over the dredging member 24, and the overflowed rainwater is temporarily stored in the storage and penetration tank 20, and the water level in the storage and penetration tank 20 gradually increases. To rise. As the water level rises, the air in the storage and permeation tank 20 is discharged to the outside through the vent opening 45 or the vent opening 53.

水位が上昇する間も、側壁５１に形成した雨水流出口５２からは、開口面積に規制された量の雨水が、側壁５１と越流堰５７との間の空間に流入し、該空間内での水位も次第に上昇していく。そして、側壁５１と越流堰５７との間の空間での水位が、越流堰５７の上端のレベルに達すると、そこを越流した雨水は、流出桝５０の天板と越流堰５７の上端との間の雨水越流空間を通って、越流堰５７と側壁５５の間の空間に流下し、流出管５６から流出桝５０の外に排出される。なお、上記の雨水流出抑制施設Ａ１では、前記樋部材２４を貯留浸透槽２０内に配置したことで、逆噴射ノズルやバキュームノズルをより容易に貯留浸透槽２０内に導入することができるようになり、貯留浸透槽２０全体のメンテナンスも容易となる。 Even while the water level rises, the amount of rain water regulated by the opening area flows into the space between the side wall 51 and the overflow weir 57 from the storm water outlet 52 formed in the side wall 51. The water level gradually increases. Then, when the water level in the space between the side wall 51 and the overflow weir 57 reaches the level of the upper end of the overflow weir 57, the rainwater overflowed there flows the top plate of the outflow dam 50 and the overflow weir 57. It flows down to the space between the overflow weir 57 and the side wall 55 through the rainwater overflow space between the upper end and the outflow pipe 50 and is discharged out of the outflow gutter 50. In the rainwater outflow suppression facility A1, the reverse injection nozzle and the vacuum nozzle can be more easily introduced into the storage and penetration tank 20 by arranging the dredging member 24 in the storage and penetration tank 20. Thus, maintenance of the entire storage permeation tank 20 is also facilitated.

本発明による雨水流出抑制施設Ａ１では、貯留浸透槽２０は路線方向に勾配を持つ道路に沿って道路勾配とほぼ同じ勾配を持って埋設されており、かつ、貯留浸透槽２０は雨水の流れ方向に非透水性の隔壁２２で複数の分割槽２０ａ〜２０ｄに分割されている。したがって、雨水の流入量が大きくなったときの貯留浸透槽２０での雨水貯留状態は、次のようにして進行する。 In the rainwater outflow control facility A1 according to the present invention, the storage and penetration tank 20 is embedded with a slope substantially the same as the road gradient along a road having a gradient in the route direction, and the storage and penetration tank 20 is in the direction of rainwater flow. It is divided into a plurality of division tanks 20a to 20d by a non-permeable partition wall 22. Therefore, the rainwater storage state in the storage permeation tank 20 when the inflow amount of rainwater increases proceeds as follows.

すなわち、各分割槽２０ａ〜２０ｄは、隔壁２２の下部に形成したオリフィス開口２３によって互いに連通した状態にあるので、各隔壁２２の開口２３の断面積に応じた量の雨水は、常に、当該隔壁２２の下流側の分割槽に流入するようになる。そして、各分割槽２０ａ〜２０ｄ内では、下流側に位置する隔壁２２に形成された開口２３を流下する量以上の雨水が流入すると、その差分の雨水が当該分割槽に貯留されるようになる。したがって、流入桝４０に形成した雨水流入口４４の開口面積、各隔壁２２に形成した開口２３の開口面積、および、流出桝５０の側壁５１に形成した雨水流出口５２の開口面積、を適宜設定することにより、図５に示すように、それぞれの分割槽２０ａ〜２０ｄ内に、同時に雨水は貯留されることとなり、各分割槽での雨水の最大貯水量は、下流側に位置する隔壁２２の上端高さによって規制される。なお、最下流側の分割槽である分割槽２０ｄでは、最大貯水量は、流出桝５０の側壁５１に形成した通気開口５３の高さ位置の規制を受ける。 That is, since each division tank 20a-20d is in the state which mutually connected by the orifice opening 23 formed in the lower part of the partition 22, the rainwater of the quantity according to the cross-sectional area of the opening 23 of each partition 22 always is the said partition. 22 flows into the dividing tank on the downstream side. And in each division tank 20a-20d, when rainwater more than the quantity which flows down the opening 23 formed in the partition 22 located in the downstream flows in, the rainwater of the difference comes to be stored in the said division tank. . Therefore, the opening area of the rainwater inflow port 44 formed in the inflow trough 40, the opening area of the opening 23 formed in each partition wall 22, and the opening area of the rainwater outflow port 52 formed in the side wall 51 of the outflow trough 50 are set as appropriate. By doing so, as shown in FIG. 5, rainwater is simultaneously stored in each of the divided tanks 20 a to 20 d, and the maximum amount of rainwater stored in each divided tank is that of the partition wall 22 located on the downstream side. Regulated by the height of the top edge. In the split tank 20 d that is the most downstream split tank, the maximum water storage amount is regulated by the height position of the vent opening 53 formed in the side wall 51 of the outflow basin 50.

特に好ましい態様は、各隔壁２２の下部に形成した開口２３の面積が、勾配上部から勾配下部に向けて次第に小さくなるように設定される。それにより、各分割槽２０ａ〜２０ｄでの雨水の貯水状態をほぼ一定速度とすることができ、貯留浸透槽２０全体での雨水貯留効率を一層改善することができる。 A particularly preferable aspect is set such that the area of the opening 23 formed in the lower part of each partition wall 22 gradually decreases from the upper part of the gradient toward the lower part of the gradient. Thereby, the rainwater storage state in each division tank 20a-20d can be made into a substantially constant speed, and the rainwater storage efficiency in the storage penetration tank 20 whole can be improved further.

図５と図７とを比較すればわかるように、本発明による雨水流出抑制施設Ａ１では、貯留浸透槽２０が路線方向に勾配を持つ道路に沿って道路勾配とほぼ同じ勾配を持って埋設されていながら、貯留浸透槽２０を雨水の流れ方向に非透水性の隔壁２２で複数の分割槽２０ａ〜２０ｄに分割したことで、貯留浸透槽２０全体での有効貯水率を大きく改善することが可能となる。 As can be seen from a comparison between FIG. 5 and FIG. 7, in the rainwater outflow suppression facility A1 according to the present invention, the storage and infiltration tank 20 is embedded along a road having a gradient in the direction of the road with a gradient substantially equal to the road gradient. However, it is possible to greatly improve the effective water storage rate in the entire storage and permeation tank 20 by dividing the storage and permeation tank 20 into the plurality of divided tanks 20a to 20d by the impermeable partition wall 22 in the rainwater flow direction. It becomes.

なお、貯留浸透槽２０は、非透水性の隔壁２２を介在させることで、複数に分割されるが、図１，２に示す例では、隔壁２２は貯留浸透槽２０の上端にまでは達していない。隔壁２２が存在しない領域では、図６に基づき説明した樹脂製の貯水空間形成部材３１を位置をずらしながら積層することで、連続した状態とすることができるので、貯留浸透槽２０全体の構成を安定化することができる。 The storage and penetration tank 20 is divided into a plurality of parts by interposing a water-impermeable partition wall 22, but the partition wall 22 reaches the upper end of the storage and penetration tank 20 in the examples shown in FIGS. Absent. In the region where the partition wall 22 does not exist, the resin water storage space forming member 31 described based on FIG. 6 can be laminated while shifting the position, so that the continuous state can be obtained. Can be stabilized.

なお、図３に貯留浸透槽２０の断面図を示すように、隔壁２２として、貯留浸透槽２０の断面全体を覆う大きさのものを用いることもできる。ただし、その場合には、当該隔壁２２の上端に空気抜き孔２５を形成することが必要となる。 As shown in the cross-sectional view of the storage and permeation tank 20 in FIG. 3, a partition wall 22 having a size that covers the entire cross section of the storage and permeation tank 20 can also be used. However, in that case, it is necessary to form the air vent hole 25 at the upper end of the partition wall 22.

図４は、本発明による雨水流出抑制施設の他の例示す概略図であり、この雨水流出抑制施設Ａ２は、流出桝５０を備えない点、および貯留浸透槽２０が遮水シート２１でなく透水性シート２６で覆われている点の２点で、上記した雨水流出抑制施設Ａ１と相違する。他の構成は雨水流出抑制施設Ａ１と同じであり、同じ符号を付すことで説明は省略する。 FIG. 4 is a schematic view showing another example of the rainwater outflow control facility according to the present invention. The rainwater outflow control facility A2 is not provided with the outflow basin 50, and the storage and permeation tank 20 is not the water shielding sheet 21 but the water permeability. It is different from the rainwater outflow suppression facility A1 described above in two points that are covered with the adhesive sheet 26. The other configuration is the same as the rainwater outflow suppression facility A1, and the description is omitted by attaching the same reference numerals.

この雨水流出抑制施設Ａ２での貯留浸透槽２０における雨水の貯留態様は、雨水流出抑制施設Ａ１の場合と同じであり、貯留された雨水が河川に放出されるのではなく、透水性シート２６を通して徐々に地中に浸透していく点で相違するだけである。 The rainwater storage mode in the storage and penetration tank 20 in the rainwater outflow control facility A2 is the same as that in the rainwater outflow control facility A1, and the stored rainwater is not discharged into the river but through the water permeable sheet 26. The only difference is that it gradually penetrates into the ground.

Ａ１，Ａ２…雨水流出抑制施設、
１…路線方向に勾配を持つ道路、
２０…貯留浸透槽、
２０ａ〜２０ｄ…各分割槽、
２１…遮水シート、
２２…非透水性材料からなる隔壁、
２３…オリフィスとして機能する開口、
２４…樋部材、
２５…空気抜き孔、
２６…透水性シート、
３１…樹脂製の貯水空間形成部材、
４０…流入桝、
４１…管理用開口、
４２…雨水入口、
４３…側壁、
４４…雨水流入口、
４５…通気開口、
５０…流出桝、
５１、５５…側壁、
５２…雨水流出口、
５３…通気開口、
５４…管理用開口、
５６…流出管、
５７…越流堰、
５８…オリフィスとして機能する開口。 A1, A2 ... Rainwater outflow control facility,
1 ... a road with a gradient in the direction of the route,
20 ... Storage and penetration tank,
20a-20d ... each division tank,
21 ... Water shielding sheet,
22: partition walls made of a water-impermeable material,
23. Opening that functions as an orifice,
24 ....
25. Air vent hole,
26 ... water-permeable sheet,
31 ... Resin water storage space forming member,
40 ... Inflow trough,
41 ... opening for management,
42 ... Rainwater entrance,
43 ... side wall,
44 ... Rainwater inlet,
45. Ventilation opening,
50.
51, 55 ... sidewalls,
52 ... Rainwater outlet,
53. Ventilation opening,
54 ... opening for management,
56. Outflow pipe,
57 ... Overflow weir,
58: An opening that functions as an orifice.

Claims

地中に埋設された貯留浸透槽を持つ雨水流出抑制施設であって、
前記貯留浸透槽は路線方向に勾配を持つ道路に沿って道路勾配とほぼ同じ勾配を持って埋設されており、
雨水は勾配上部に設けた流入桝から前記貯留浸透槽に流入し、流入した雨水は貯留浸透槽を勾配下部方向へ流下するようになっており、
そこにおいて、前記貯留浸透槽は雨水の流れ方向に非透水性の隔壁で複数の分割槽に分割されており、各分割槽同士は隔壁下部に形成した開口によって互いに連通していることを特徴とする雨水流出抑制施設。 It is a rainwater outflow control facility with a storage seepage tank buried underground,
The storage permeation tank is embedded with a road gradient having a gradient substantially the same as the road gradient,
Rainwater flows into the storage and penetration tank from the inflow trough provided at the upper part of the gradient, and the rainwater that flows in flows down the storage and penetration tank toward the lower part of the gradient,
The storage and penetration tank is divided into a plurality of divided tanks by impermeable partition walls in the rainwater flow direction, and the divided tanks communicate with each other through an opening formed in the lower part of the partition walls. Rainwater outflow control facility.

貯留浸透槽の勾配下部側には流出桝が備えられており、前記流出桝は内部に越流堰を有しており、前記越流堰は下部にオリフィス開口を有していることを特徴とする請求項１に記載の雨水流出抑制施設。 An outflow soot is provided on the lower slope side of the storage infiltration tank, the outflow soot has an overflow weir inside, and the overflow weir has an orifice opening in the lower part. The rainwater outflow control facility according to claim 1.

流入桝に形成した貯留浸透槽への雨水流入口と各隔壁下部に形成した開口はほぼ一直線状に配列しており、すべての開口にわたるようにして開口内には樋部材は配置されていることを特徴とする請求項１または２に記載の雨水流出抑制施設。 The rainwater inlet to the storage infiltration tank formed in the inflow trough and the openings formed in the lower part of each partition are arranged in a straight line, and the dredging member is arranged in the opening so as to cover all the openings. The rainwater outflow suppression facility according to claim 1 or 2.

各隔壁下部に形成した開口は勾配上部から勾配下部に向けて次第に開口面積が小さくなっていることを特徴とする請求項１ないし３のいずれか一項に記載の雨水流出抑制施設。 The rainwater outflow suppression facility according to any one of claims 1 to 3, wherein an opening formed in each partition lower portion has an opening area gradually decreasing from the upper part of the gradient toward the lower part of the gradient.