JP2004052243A - Storage and/or permeation facility for rainwater or the like - Google Patents

Storage and/or permeation facility for rainwater or the like Download PDF

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JP2004052243A
JP2004052243A JP2002207131A JP2002207131A JP2004052243A JP 2004052243 A JP2004052243 A JP 2004052243A JP 2002207131 A JP2002207131 A JP 2002207131A JP 2002207131 A JP2002207131 A JP 2002207131A JP 2004052243 A JP2004052243 A JP 2004052243A
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rainwater
filling member
facility
filling
storage
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Japanese (ja)
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Koji Harada
原田 浩次
Motomune Sasaki
佐々木 基宗
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/108Rainwater harvesting

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Abstract

<P>PROBLEM TO BE SOLVED: To provide facilities for storage and/or permeation of rainwater or the like in which inflow sand or sludge together with rainwater are conducted and collected in a specified position, sucked out by vacuum or the like, cleaned away, and removed, and further, even if sand or the like settle in the storage section after long time use, they can be removed, the inside volume can be sufficiently secured. <P>SOLUTION: Rainwater or the like are stored and/or permeated in the underground position by the facilities. A first filling member provided with a guide means guiding rainwater or the like to a required direction by the gravity and/or rainwater flow is disposed in the bottom of a storage tank. A second filling member having a specified porosity and a sufficient strength even if it is connected vertically and laterally and embedded underground, is disposed on the top thereof. The whole facilities are embedded underground. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、雨水等を貯留及び/又は浸透する施設に係り、特に、雨水と共に流入する砂等を効率よく除去できる、雨水等の貯留及び/又は浸透する施設に関する。
【0002】
【従来の技術】
従来、例えば大規模な宅地造成地では、造成面積に見合う間隔や規模で調整池を造成している。この調整池は、例えば地面を1m程度掘下げて雨水等の貯留部を形成し、この貯留部に周囲の住宅地からの排水溝や道路の側溝を接続するものであり、集中豪雨等に際しては余分な雨水等を一時貯留して、周囲の住宅地の雨水等の滞留や、河川の氾濫や、下水の河川への流出等を防止するものである。
【0003】
また、貯留部の周囲を透水シートで形成して、雨水を徐々に地面に浸透させるように構成した浸透式の貯留部を用いたものもある。このように貯留部の壁面を防水性シートで形成するか、透水性シートで形成するか、或いは下方を防水性シートで形成し上方を透水性シートで形成することによって、貯留施設、浸透施設、貯留浸透施設として機能させるものである。
【0004】
この種の雨水等の貯留浸透施設として、特公平4−26648号公報に記載の雨水等の貯留浸透施設がある。この公報に記載の技術は、地面を掘下げてタンク部を構成し、その底部からグランドライン付近まで、複数の容器状部材を縦横かつ上下に配設して充填し、最上部には、被覆手段を施したことを特徴とするものである。そして、容器状部材を多数の孔を有する底部及び周側板で構成し、底部に向かって小さくなるテーパ状に構成したことを特徴とするものである。
【0005】
また、雨水を貯留する装置として、特開2000−160606号公報に記載の雨水貯溜装置がある。この公報に記載の技術は、地面を掘り下げて形成した貯水槽の内部に、複数本の支柱を備えた合成樹脂製充填体を縦横に並べると共に上下に積み重ねて充填し、その上に被覆手段を施した雨水貯溜装置であって、貯水槽の底面に固形分排出用の溝を形成し、少なくとも上方の合成樹脂製充填体の支柱間に多数の水噴射孔を有する散水管、又は多数の排気孔を有する散気管を配設したものであり、充填体に堆積する固形分を簡単に取り除くことができるメンテナンスの容易な雨水貯溜装置を提供するものである。
【0006】
また、貯留槽内に堆積した土砂などの除去性を付与した雨水等の貯留浸透施設として、特開2001−90167号公報に記載のものがある。この公報に記載の技術は、貯水槽形成用凹部所の底部に、清掃時に作業員が入ることができる程度の空間を備えた土台枠を設置し、貯水空間形成用構築体を、上記土台枠上に連通状態で載置積層化すると共に、その上面は覆土による埋設手段を施すことを特徴としたものである。
【0007】
【発明が解決しようとする課題】
ところで、特公平4−26648号公報に記載の雨水等の貯留浸透施設は、雨水と共に砂や汚泥が貯留部に流れ込むことを防止するため、流入部に泥溜め枡を備えているが、長期間使用しているうちに泥溜め枡を通過した砂や汚泥が貯留部の底面に沈殿して堆積する。貯留部は内部に容器状部材が縦横かつ上下に配設して充填されており、堆積した砂や汚泥を除去することが難しい。このため、貯留部の内容積が徐々に少なくなって雨水の貯留量が少なくなり、内容積が極端に少なくなると調整池として機能しなくなる恐れがあった。その場合、既設の調整池を掘り起こし、充填部材を撤去後に清掃し、再度充填部材を配設しなおすという手間と多額な維持費がかかる。また、必要に応じて新規の貯留浸透施設を造成することとなり、新たな土地を必要とし、土地の有効利用の妨げになるという問題点も生じる。
【0008】
更に、特公平4−26648号公報に記載のものは、タンク内部に流入した雨水に含まれている土砂等の異物が、その底面に堆積して充填部材を埋め込んでしまい、雨水等の貯留量が低下する。あるいは、当該堆積物が内周部や底部の透水性シートの目に入って目詰まりが生じ、地下浸透能力が低下する等の問題点がある。
【0009】
また、特開2000−160606号公報に記載の雨水貯溜装置は、貯水槽の内部に散水管や散気管を別途配設するため、構成が複雑となって装置の作製が煩雑となり、費用もかさむという問題点がある。そして、散水管や散気管が貯水槽内に位置するため、その分貯水槽の空隙率が下がり貯水量が減るという問題点がある。さらに、充填体に堆積する固形分を散水管で取り除くときには、貯水槽を空にして散水管から高圧の水を噴射する操作が必要である。
【0010】
特開2001−90167号公報に記載のものは、上記特公平4−26648号公報が持つ課題は解決しているものの、土台枠は砂等を保持する機能が必要なため、少なくとも底部は開口部のない枠体となり、貯留された雨水等が底部から地下浸透していくことは望めない。仮に、底部に、雨水の浸透は阻害しないがフィルター機能を付加した透水孔、又は透水用枠状口を設けたとしても土砂等が堆積し、目詰まりにより透水能力が低下することが発生する。また、清掃時に作業員が入ることができる程度の巨大な空間を有する枠体とする必要があり、その施工や撤去が困難であるという問題点がある。
【0011】
本発明は、このような問題に鑑みてなされたものであって、その目的とするところは、雨水と共に流入する砂や汚泥を所定の場所に誘導して集め、この場所に堆積した砂や汚泥をバキューム等で吸い出すことができ、また、洗浄して除去することができ、長期間使用して貯留部に砂等が堆積しても除去することができ、内容積を充分に確保できる雨水等を貯留及び/又は浸透する施設を提供することにある。
【0012】
また、雨水等の貯留及び/又は浸透施設において、雨水と共に貯留部に流入する砂や汚泥を雨水と共に一定の方向に誘導し、砂や汚泥を施設の底部の所定の位置に形成した凹窪部に誘導して堆積させ、堆積した砂や汚泥を除去しやすくする充填部材を提供することにある。そして、雨水の貯留部に充填部材を積み重ねるときに、充填部材の強度が大きく施工者が充填部材の上に載って安定して積み重ねることができる充填部材と、この充填部材を使用し施工作業が容易に行える雨水等を貯留及び/又は浸透する施設を提供することにある。
【0013】
【課題を解決するための手段】
上記課題を解決するための、本発明の請求項1に記載の雨水等を貯留及び/又は浸透する施設は、地下に雨水等を貯留及び/又は浸透する施設であって、貯留槽の底部に雨水等を重力及び/又は雨水流により所望の方向に誘導する誘導手段を備えた第1の充填部材が配設され、その上部に所定の空隙率を有しかつ上下左右に連設して地中に埋設しても充分な強度を有する第2の充填部材が配設され、施設全体が地中に埋設されていることを特徴とする雨水等を貯留及び/又は浸透する施設である。
【0014】
請求項1の構成によると、貯留槽底部に配設された第1の充填部材に設けられている雨水等を所定方向に誘導する誘導手段により、雨水と共に貯留槽に入り込んだ砂等はその誘導手段により所定の方向、位置に誘導される。このため、雨水と共に貯留槽に入り込んだ砂等は貯水槽底部全面に広がることがなく所定の位置に集合させられるため、貯留槽底部に用いられる透水性を有するシートの目詰まりなどを起こすことが回避できる。
【0015】
また、第1及び第2の充填部材全てを軽量の合成樹脂で構成すれば、施工及び撤去が容易であり、かつ撤去した部材をリユース、リサイクルすることも可能となる。第1の充填部材合計の積み高さは特に制限されるものではないが、砂等の誘導性能を低下させないためには50cm以上が好ましい。なお上記の合成樹脂とは、例えばポリプロピレン、ポリエチレン、塩化ビニル樹脂、ポリエチレンテレフタレート樹脂等の熱可塑性樹脂であって、これらの発泡体、又はこれらのブレンド物、又はこれらに更にフィラーや無機物等の充填材を添加したものでも良い。
【0016】
請求項2においては、上記第1の充填部材が、前記貯留部に流入した雨水等を所定方向に誘導する傾斜板部を備えている。この構成によれば、雨水と共に貯留部に流入した固形分である砂や小砂利等は、充填部材の傾斜板部で所定の方向に誘導され、貯留部の底部に形成された凹窪部等の所定の個所に落下して堆積される。そして、堆積された砂等が一定量を超えると、地面に開口する連通路等からバキューム管等を使用して除去することができるため、貯留部の所定の貯留量を確保することができる。
【0017】
請求項3においては、上記第1の充填部材が、充填部材を上下方向に積み重ね可能とする連結部と、前記貯留部に流入した雨水等を所定方向に誘導する傾斜板部とを備え、該傾斜板部の下面に補強部が形成されている。  この構成によれば雨水と共に貯留部に流入した砂等の固形分は、充填部材の傾斜板部で所定の方向に誘導され、貯留部の底部に形成された凹窪部等の所定の個所に落下して堆積され、容易に除去することができるため、貯留部の所定の貯留量を確保することができる。また、施設の貯留部に、この充填部材を積み重ねるとき傾斜板部の上面に人が載って作業を行っても充填部材が破損することなく、また人の体重が傾斜板部に加わっても変形することが少ないため、作業が安定して行え作業効率が向上する。
【0018】
前記補強部が、前記傾斜板部の下面に形成した補強リブであり、前記傾斜板部は前記補強リブで囲まれた下方開口の空間が形成され、該空間の上部と連通する開放部が前記補強リブ及び/又は前記傾斜板部に形成される。 この構成によれば、貯留部に徐々に雨水が進入して水面が上昇したとき、補強リブで囲まれた下方開口の空間に空気が残るが、この空気は開放部から上昇して排気され空間内に雨水が進入することができるため、貯留部に雨水を充満させることができ雨水の貯留量が減ることを防止できる。
【0019】
前記開放部は、前記傾斜板部を貫通する貫通孔で形成され、前記貫通孔の傾斜板部上面側の周囲には突部が形成されている。  この構成によれば、補強リブを分断しないで空間の開放部を形成できるため傾斜板部の強度をさらに向上でき、貫通孔の傾斜板部上面側の周囲に形成された突部により、砂等が貫通孔を通して落下することを防止でき、突部が施工者の靴等をグリップするため滑ることが防止され、施工性が良く作業効率が向上する。突部は球面や円錐面で形成されることが好ましい。
【0020】
請求項4においては、第1の充填部材の上部に雨水及び砂等を通過させる仕切り板が設置され、第1の充填部材の上面が略水平面とされている。従って、更にその上に配置される第二の充填部材が安定して置かれるので、雨水等が流入した場合でも充填部材が移動することがない。
仕切り板は、雨水、砂などを通過させる機能を備えていれば特に限定されるものではないが、多数の孔を備えたパレット状の枠体が好ましい。又、仕切り板の上部に合成樹脂製の第2の充填部材を設置し易くするために、上面が平らであることが好ましい。更に、仕切り板の位置を決めやすいように、底部の第1の充填部材と嵌合等による接合部を備えて居ることが好ましい。
【0021】
請求項5においては、上記第2の充填部材が、波形折板状とされている。従って、第二の充填部材が高く積み重ねられても、下方の部材が上部の部材の重量で圧縮されて潰れることがない。
波形折板は強度を補うため、妻壁などで補強したものが好ましい。また、第2の充填部材の寸法も特に限定されるものではないが、第1の充填部材と同寸法、若しくは第2の充填部材を組み合わせて第1の充填部材と同寸法、若しくは第1の充填部材の整数倍の寸法であることが好ましい。
【0022】
請求項6においては、上記第2の充填部材が、連通枠状を呈する基底部と、当該基底部の盤面に筒状体が突設された部材、もしくは上記第2の充填部材2枚をその互いの筒状体を対向させた状態で上下に連結したものを一単位とし、これが複数単位組み合わされたものである。この場合は、筒状体により、第二の充填部材が積み重ねられた際に下方に位置する部材が潰されることが防がれ、かつ、盤面又は筒状体に設けられた貫通孔を通して雨水や砂等は移動可能である。
連通枠状体を呈する基底部と基底部の盤面に突設した筒状部は、一体でも別部材で組み立てても良い。筒状形状は特に限定されるものではないが、円筒状、角柱状、多角柱状等が挙げられる。また、筒体の強度を補うために、筒内部に仕切り壁を設けても良い。第2の充填部材の寸法も特に限定されるものではないが、第1の充填部材と同寸法、若しくは第2の充填部材を組み合わせて第1の充填部材と同寸法、若しくは第1の充填部材の整数倍の寸法であることが好ましい。
【0023】
請求項7においては、第2の充填部材が、区画枠体である。この場合は、枠体は高さ方向の圧縮に抵抗力があるので、第二の充填部材が積み重ねられた際に下方に位置する部材が潰されることが防がれ、かつ、枠体は上下に連通しているので雨水や砂等は移動可能である。
区画の寸法、数、平面形状は特に限定されないが、例えば、平面形状はハニカム状、格子状、円形等を個別に選択して構成し、又はそのいくつかを組み合わせて構成しても良い。第2の充填部材の寸法も特に限定されないが、第1の充填部材と同寸法、若しくは第2の充填部材を組み合わせて第1の充填部材と同寸法、若しくは第1の充填部材の整数倍の寸法であることが好ましい。
【0024】
請求項8においては、第2の充填部材が、一方が開口された容器形状とされその容器底面及び側面に、それぞれに少なくとも2個以上の貫通孔を有するものである。この場合は、個々の容器、即ち第2の充填部材を、交互に開口部同士及び底面同士が接するように積み重ねたり、間隔を開けて同方向に並べた容器の上部に各容器に係るように次の容器を重ねて配列したりすることで、第2の充填部材が積み重ねられた際に下方に位置する部材が潰されることが防がれ、かつ、設けられた貫通口を通って雨水や砂等は移動可能である。
第2の充填部材は、底部及び周側板で構成された容器形状であれば特に限定されないが、例えば、かご形状、ビール瓶等の運搬用コンテナ形状等が挙げられる。また、孔は雨水が流入または流出し、かつ内部の空気が抜ける大きさであれば良く、19mm以上が好ましい。又、孔の数は、1部材に2つ以上あればよいが、数が多いほど空隙率が増大し、部材の軽量化、雨水の飲み込み速度が向上するため好ましい。
【0025】
請求項9においては、第2の充填部材が有孔パイプ状であって、管の周方向に沿った複数の環状又は螺旋状溝あるいはひだにより、その管壁が凹凸状とされた管体が、上下に位置する管体同士が、その軸方向が互いに異なる方向とされて積み重ねられている。この場合は、管体の円形であるので上方からの荷重を支持可能であり、積み重ねられた際に下方に位置する管体が潰されることはなく、かつ雨水や砂等は管内を流れて移動可能である。
第2の充填部材は必ずしも孔を有していてもいなくても良いが、空隙率の増大、部材の軽量化や雨水の飲み込み速度の向上のために、多くの孔を備えていることが望ましい。
【0026】
【発明の実施の形態】
次に、本発明による雨水等を貯留及び/又は浸透する施設の、一実施形態を図面を参照しながら説明する。なお、本実施の形態では、雨水等を貯留する貯留施設について説明する。雨水等を浸透する施設は、この施設の貯留槽底部及び/又は側部にシートが用いられない又は透水性シートが用いられれば良いだけであるので、特に説明はしない。
【0027】
図1は、本実施の形態に係る雨水等の貯留施設の断面図、図2は図1の平面図、図3は図1のA−A線断面図である。但し、第2の充填部材については、その詳細を図4以降にて示すので、図1〜図3においては、第1の充填部材のみを示し、第2の充填部材については単に配置場所を示すのみとする。
【0028】
図1〜3において、雨水等の貯留施設は、大雨が降ったときに雨水を一時的に貯留し、河川流量が急激に増大するのを防止する流出抑制効果を有するものである。そして、貯留された雨水等を植木への散水や洗車用水、非常時の生活用水や防火用水として利用することもできるものであり、地面1を掘下げて形成した貯留部10と、貯留部10内に水平方向に並べて設置すると共に、上下方向に重ねる多数の第1の充填部材30Aと、充填部材30Aの上部に載置され貯留部10の上部を覆う仕切板39と、更にその上部の貯留部10内に設置される第2の充填部材30Bとを備えている。
【0029】
貯留部10は、地面1を例えば1〜10m程度の深さで平面形状が矩形状に掘下げて掘削部2を造成し、底面は割栗石等を敷き詰めて突き固めて基礎部3を形成している。貯留部10の底面は、基本的には平坦面となっており、底面の長辺方向の中央部には平坦面から一段落ち込んだ凹窪部11が形成されている。この凹窪部11は底面の短辺方向の全幅に亘って形成されている。凹窪部11の底面及び貯留部10の底面全面には、防水シート12が敷設されている。防水シート12としては厚さが1.5mm以上の合成ゴム又は樹脂系シート又はアスファルト系シートを使用している。そして、貯留部10の底面の凹窪部11には格子状のフレーム14が嵌め込まれ、貯留部10の底面は全面が略平坦となっている。
【0030】
なお、割栗石等から形成される基礎部3上に保護ボード13を敷き、その上に防水シート12を敷設するようにしてもよい。また、前記した保護ボード13の代わりに、防水シート12の下に必要に応じてポリエステル系不織布シート等の基礎用シート(図示せず)を敷設し、防水シート12を基礎部3の割栗石から保護するようにしてもよい。さらに、凹窪部は貯留部の広さに応じて複数本形成し、複数の凹窪部に充填部材30Aの後述する傾斜板部で雨水を誘導するようにしてもよい。
【0031】
前記のように略平坦とされた貯留部10の底面に、多数の充填部材30Aが水平に並べられると共に、上下に重ねられて設置される。本実施の形態では、貯留部10は図2に示すように充填部材30Aを1段に20個並設するスペースを有し、凹窪部11の両端に対応する2ヶ所を除いた18個を1段に並設している。この状態で第1の充填部材30Aを3段、直接積み重ねて小さいピッチとし、この上に第1の充填部材30Aを2段、連結部材35(図7、図8及び図9参照)を挟んで積み重ねて大きいピッチとして積み重ねられて、貯留槽底部の貯留部10内に充填されて雨水等の貯留空間を確保するものである。
【0032】
充填部材2個分が除かれた貯留部10内を上下方向に貫通するスペースには、凹窪部11に連通する角型マンホール15,16が設置されている。そして、第1の充填部材30Aの傾斜板部で誘導された雨水が砂等と共に凹窪部11に誘導され落下する構成となっている。また、この角型マンホール15,16は、凹窪部11に堆積された砂等の堆積物を除去する際に、バキューム管や洗浄水を噴射する管を通すスペースとして利用される。
【0033】
第1の充填部材30Aは、図4〜6に詳細に示すように、ポリエチレン、ポリプロピレン、塩化ビニル、ポリエチレンテレフタレート等のプラスチックや、これらの廃プラスチック等から形成され、貯留部10の上部を覆う第2の充填部材30B及び被覆部材40の垂直荷重、及び水圧による水平荷重を支持し、貯留部10の空間を確保する4本の柱状の連結部31と、4本の連結部31に固定され水平面に対して5度程度の角度で傾斜する傾斜板部32とから構成されている。
【0034】
傾斜板部32は厚さが4〜5mm程度の肉厚の板材で形成され、流入した雨水等を所定方向に誘導する誘導手段を構成する。傾斜板部32の傾斜方向Sは、矢印の先端が低い方向となっており、傾斜角度が緩やかな場合砂等が雨水と共に流れずに滞留するため、5度程度の傾斜角度が好ましい。充填部材30Aの大きさは、例えば1辺が50cm〜1m程度の正方形の傾斜板部32と、傾斜板部の四隅に上下に延びる連結部31とから構成され、連結部は高さが10〜15cm程度の三角柱で形成され、1辺が50cm〜1m程度で高さが10〜15cm程度の直方体に納まるような形状をしている。
【0035】
なお、第1の充填部材30Aの大きさは、1辺が30cm程度の大きさでも、また1辺が1m以上の大きさでもよい。また、第1の充填部材30Aの傾斜板部32は平板を傾斜させた例を示したが、平板でなく傾斜方向に沿って緩やかに凹んだ、或いは緩やかに凸状に膨らんだ湾曲面でもよく、小さい段差が連続して勾配が付いた階段状の傾斜面でもよい。さらに、急勾配から緩勾配に途中で変化するような傾斜面で構成してもよい。
【0036】
連結部31は厚さが4〜5mm程度の肉厚の板材で形成され、大きい断面の三角パイプ状の上部柱部31aの下方には、上部柱部31aの内部に嵌合する小さい断面の三角パイプ状の下部柱部31bが形成されている。したがって、第1の充填部材30Aの上部柱部31aに、他の第1の充填部材30Aの下部柱部31bを内嵌させることにより充填部材30A同士を小さいピッチ、すなわち連結部31の高さのピッチで積み重ねることができる。三角パイプ状の連結部31の底面と側面には上下に貫通孔31c,31dが形成され、下方の貫通孔から雨水が進入することができ、側方の貫通孔から内部の空気が逃げることができる。なお、下部柱部31bは、コーナー部が切欠かれているが連続したものでもよい。また、連結部31内の底面は土砂等を傾斜板部32に誘導するために、側面の貫通孔方向に傾斜していることが好ましい。
【0037】
傾斜板部32の下面には補強部が形成され、上面は平坦で緩やかな傾斜面となっている。補強部としては、所定の間隔で一体的に縦横に立設された格子状の補強リブ33が形成されている。この補強リブ33は傾斜板部32の中央部の上下幅が大きく、周辺に行くにしたがって上下幅が徐々に小さくなるように形成されている。この構成により、傾斜板部32の上面に荷重が加わっても傾斜板部32の変形は小さくなり、上面に施工者が載ってもひび割れ等の破損が生じることを防止できる。なお、補強リブは格子状でなくてもよいが、格子状にすると一方向のものと比較して強度が大きくなり好ましく、六角形のハニカム格子状が強度面からより好ましい。
【0038】
補強部である補強リブ33には、この補強リブで囲まれた下方開口の空間が形成され、この空間の上部と連通する開放部34が形成してある。開放部34としては、補強リブ33の一部を切欠き隣接する下方開口の空間と連通するように構成する。この構成により、貯留部10に下方から徐々に雨水が溜まって上昇してきたとき、この下方開口の空間に空気が溜まったままとならず、空気が開放部34から隣接する空間に移動して代わりに雨水が進入することができると共に、浮力による第1の充填部材の浮き上がりを防止することができることとなり、貯留部10に雨水を充満させて所定の貯留量を確保することができるものとなる。なお、補強リブ33を切り欠いた開放部34でなく、補強リブ33の上部を水平方向に貫通する孔(図示せず)を形成して連通させてもよい。
【0039】
第1の充填部材30Aは連結部31の上部に連結部材35を挟んで積み上げることにより、大きいピッチで積み重ねることができる。連結部材35は三角パイプ状の連結部31を繋ぐものであり、図7に示すように上方の大きい三角パイプ状の連結部36は充填部材30Aの下部柱部31bを外嵌し、下方の小さい略三角パイプ状の連結部37は第1の充填部材30Aの上部柱部31aに内嵌されるように構成されている。第1の連結部材35の高さを調整することにより、第1の充填部材30Aを積み重ねるピッチを任意に設定することができる。また、図示していないが、連結部の高さが大きい充填部材と、小さい充填部材の2種類の第1の充填部材を準備し、小さいピッチ又は大きいピッチで積み重ねるようにしてもよい。なお、連結部37は一部が切欠かれているが、連続したものでもよい。
【0040】
連結部材35は外側の直交する垂直面に水平方向の接合部38を備えている。垂直面の一方には接合凸部38aが突出形成され、垂直面の他方には接合凸部38aが嵌合する接合孔38bが形成されている。接合凸部38aは、接合孔とほぼ同じ直径の根元の小径部と、その上部の先端が傾斜している大径部とから構成され、小径部と大径部に掛けてスリットが形成され、大径部は内側に湾曲して縮径することができる。この構成により、接合凸部38aは接合孔38bに嵌合して保持され、連結部材35同士を水平方向に接合することができる。連結部材35は土砂を傾斜板部32に誘導するために傾斜した仕切り板を備えており、この仕切り板の低い位置には貫通孔39が形成され、雨水の進入と空気の排出も可能となっている。
【0041】
連結部材35は、図8(a)、図9(a)に示すように、接合部38の接合凸部38aを接合孔38bに嵌合させることにより2個の連結部材35を接合することができる。このように2個を接合させた連結部材は、充填部材30Aが貯留部10の外周側に位置しているときに使用する。また、図8(b)、図9(b)に示すように、接合部38の接合凸部38aを接合孔38bに嵌合させることにより4個の連結部材35を接合することができる。この場合は、第1の充填部材30Aが貯留部10の中心側に位置しているときに使用する。なお、使用していない接合凸部38aで突出しているものは、刃物等で切断して平坦としてもよい。また、角型マンホール15,16の角部に対向する第1の充填部材30Aを接合するときは、図示していないが3個の連結部材を接合して使用する。
【0042】
本実施の形態では、図2において左端の縦一列の第1の充填部材30Aは雨水を誘導する傾斜方向S1が右方向に向くように、すなわち貯留部の中央の凹窪部11に向けて誘導するように配置され、右端の縦一列の第1の充填部材30Aも傾斜方向S1が左方向に向いて貯留部の中央の凹窪部11に向けて誘導するように配置されている。そして、左端から2番目の縦一列の第1の充填部材30Aは、上から順に傾斜方向Sが下向きS3、右向きS1、上向きS4、上向きS3になるように配置され、右端から2番目の縦一列の第1の充填部材30Aは上から順に傾斜方向Sが下向きS3、左向きS1、左向きS1、上向きS3になるように配置される。中央上側の第1の充填部材30Aは、傾斜方向Sが同図において下向きS2になるように配置され、中央下側の第1の充填部材30Aは左向きS3になるように配置されている。
【0043】
前記の傾斜方向は以下のように決定されている。第1に、第1の充填部材の傾斜方向S1は凹窪部11に向けられる。第2に、凹窪部の上部に位置する第1の充填部材は傾斜方向S2のように流出側に向けられる。第3に、連通路であるマンホール部分では、雨水が行き止まりにならないように別の方向に傾斜方向S3のように逃がす。そして、第4に、隣同士の第1の充填部材の傾斜方向が向き合わないように傾斜方向S4とする。この結果、流出側のマンホール部分では、一部の雨水が右回りに旋回する旋回流S5が生じて徐々に傾斜板部の隙間から落下するように構成される。なお、傾斜方向S3を右向きとし、右側の第1の充填部材の傾斜方向S4を上向きにすることにより旋回流を中央より右側に、左回りとするようにしてもよい。
【0044】
このため、雨水は第1の充填部材30Aにより中央の凹窪部11に向けて誘導されると共に、凹窪部11に向けて徐々に落下して誘導される構成となっている。第1の充填部材30Aはこのような誘導方向で、小さいピッチで積み重ねたあと、大きいピッチで積み重ねられる。なお、小さいピッチで積み重ねた場合は、傾斜板部32は下段側の誘導方向の傾斜板部32と僅かな段差で連続し、雨水を連続的に誘導できる。
【0045】
このように1段に18個連設して、5段積み重ねられた第1の充填部材30Aは、基礎に相当する下半分が小さいピッチで積み重ねられて強度が大きくなっており、上半分は大きいピッチで空隙率が大きくなっている。また、第1の充填部材30Aを高く積み重ねると不安定となるが、上部の第1の充填部材30Aは連結部材35の接合部38で水平方向に接合されているため安定し、施工が容易となる。さらに、第1の充填部材30Aは積み重ね状態が安定しているため、上部に積み重ねられる第2の充填部材30B及び上部の被覆部材40を安定して支持することができ、雨水等を貯留及び/又は浸透する施設の耐久性を向上させることができる。
【0046】
第1の充填部材30Aは、単位体積当たりの空隙率が高いことや、実用上十分な強度、耐久性を有することが要求されると共に、運搬施工が容易であり、維持管理が容易であることが要求され、耐荷重は例えば垂直方向は1平方メートル当たり5〜20トン、水平方向は5〜16トン、空隙率は90%程度が好ましい。また、前記のように連結部31にスリットや貫通孔を設けて内部に雨水等が入るようにして空隙率を上げることが好ましい。
【0047】
第1の充填部材30Aは、その上面が略水平でかつ凹凸が少なくなるように積み重ねられるが、それでもなお若干の凹凸等ができてしまうことがある。その時には、第1の充填部材の上部に、雨水及び砂等を通過させる仕切板39が設置され、第1の充填部材30Aの上面は略水平面とされる。仕切板39は曲がりにくく、高強度で剛性を有し、かつ腐食のない材料で作成されていることが望ましく、例えば、ポリエチレン、ポリプロピレン、塩化ビニル、ポリエチレンテレフタレート等のプラスチックや、これらの廃プラスチック等から形成されれば良い。更に仕切板39には適当な大きさの貫通口が設けられ、その貫通孔を通って第2の充填部材30Bに流れ込んだ雨水や雨水に含まれる砂等が、下方の第1の充填部材方向に流れることができるようにされていることが必要である。
【0048】
このように第1の充填部材が配置され、その上に第2の充填部材30Bが積み重ねられる。第2の充填部材30Bは、所定の空隙率を有しかつ上下左右に連設して地中に埋設しても充分な強度を有し、かつ 貯留槽内に流入した雨水等が第1の充填部材の上面に均等に分配されるように誘導する誘導手段を備えていることが望ましい。
【0049】
第2の充填部材30Bも、第1の充填部材30Aと同様に、単位体積当たりの空隙率が高いことや、実用上十分な強度、耐久性を有することが要求されると共に、運搬施工が容易であり、維持管理が容易であることが要求され、耐荷重は例えば垂直方向は1平方メートル当たり5〜20トン、水平方向は5〜16トン、空隙率は90%程度が好ましい。
【0050】
この目的のためには、高強度で剛性を有し、かつ腐食のない材料で作成されていることが望ましく、例えば、ポリエチレン、ポリプロピレン、塩化ビニル、ポリエチレンテレフタレート等のプラスチックや、これらの廃プラスチック等から形成されると好都合である。
【0051】
第2の充填部材30Bの代表的な例を、図10〜22に示す。勿論これらの図に示す以外であっても、所定の空隙率を有しかつ上下左右に連設して地中に埋設しても充分な強度を有するものであれば良いことはいうまでもない。
【0052】
図10、11に示される第2の充填部材30Bは波形折板状であり、山部102と谷部103とが交互に組み合わされて山形部材100を構成し、山部102及び谷部103にはそれぞれ複数個の山部貫通孔104及び谷部貫通孔105が設けられている。山部102と谷部103とが交互に直角となるように積み重ねられ、上下の山形部材100同士がずれないよう、互いの山形部101の下端部及び山部102の一部に噛み合い溝等が設けられている。雨水等に含まれる砂等異物は、貫通口104及び105を通って下方に移動可能とされている。
【0053】
図12、13、14のものは、連通枠状を呈する基底部と、当該基底部の盤面に突設した筒状体、もしくは上記第2の充填部材30B2枚をその互いの胴体部を対向させた状態で上下に連結したものを一単位とし、これを複数単位組み合わせたものである。
図12においては、連通枠状部材200は、合成樹脂製支柱要素201が合成樹脂製連結要素202で合成樹脂製枠材206と接続されたものである。枠材206は、複数の支柱嵌合部203とそれを繋ぐ連結部206とからなり、連結要素202は、上向き嵌合部204と下向き嵌合部205をを有する嵌合部203で構成されている。
【0054】
図13における第2の充填部材30Bは、基盤部301の一方の面側に複数の筒体部302が突設されたものである。筒体の先端部には、係合用凹凸模様303が設けられ、この充填部材30Bが積み重ねられた際に凹凸が嵌合して係止し、ずれないにされている。基盤部及び係止部には適宜貫通口が設けられており、雨水と共に流入する砂等異物が下方に流れるようにされている。
【0055】
図14の部材は、図12の一例における支柱要素が、図13の一例における筒体部とされたものの一例であるので、詳しい説明は省略する。
【0056】
図15、16、17の第2の充填部材30Bは、区画枠体400である。枠壁401は縦横に組み合わされて区画402を構成している、この区画402の形状は、図15に示されるような矩形のみならず、図16のようなハニカム様の組み合わせ形状や、図17のような円形の組み合わせ形状等、任意であって良い。
【0057】
図18、19、20のものは、少なくとも2つ以上の孔を有しかつ底部及び周側板で構成された容器型充填材500とされている。このよう容器形状は開口側面積が大きい推形とされており、その側面501及び底面502にはそれぞれ複数の貫通孔503が設けられている。解放側辺縁部504及び底面502の外辺縁には、外向きリブ505が設けられ、その一部に凹凸が設けられている。この凹凸は、例えば、図19又は図20に示されるように、容器型充填部材500が積み重ねられた際、凹凸が嵌合して係止し、互いがずれないように作用する。
【0058】
図21、22のものはパイプ状充填部材600であって、その表面601が軸方向断面に沿った溝又はひだ、複数の環状溝又はひだ、又は螺旋状溝又はひだにより凹凸状とされている。凹凸状の外から見ての山部602には、複数の貫通孔603が設けられている。雨水と共に流入する砂等異物は、この貫通孔603を通過して下方に流出するようにされている。パイプ状充填部材600の積み重ね方法は、特に限定されないが、崩れ難いように積み重ねられることが望ましい。例えば、図22(a)から図22(d)に示されるように、1本のパイプを6本の他のパイプが接するように充填する、いわゆる最密充填状態とされる方法がある。この時、パイプ束の周囲を結束バンド(図示せず)等で弛みなきよう結束しておくと荷崩れの心配がなくなる。
【0059】
以上に例示した第2の充填部材30Bは、いずれも貯水槽に用いられる充填材として既に知られた形状のものであるから、その構造や作用については改めて説明はしないが、いずれも軽量であって下段の第1の充填部材に掛かる圧力が小さいものであり、一部の充填部材は、雨水等が流れ込んだ際に、下段の第1の充填部材に均等に分配して流れるように雨水等を誘導可能とされたものである。従って、例示した以外にも、この機能を有するものであれば適用が可能であることは言うまでもない。
【0060】
第2の充填部材30Bは、第1の充填部材30Aの上部に、第1の充填部材30Aが貯留槽底部に置かれたと同様に積み重ねられれば良い。その時の積み重ね高さは、貯留槽の高さから第1の充填部材の高さを差し引いた高さとなるだけの段数に積み重ねられればよい。又、平面的には、第1の充填部材の略直上に、そのまま積み重ねられれば良い。従って、その平面サイズは第1の充填部材30Aと同じとされていれば取り扱いが容易となる。
【0061】
第1の充填部材30A及び第2の充填部材30Bとが、上下に合わせて11段に積層され設置されたあと、第1及び第2の充填部材30Aの側面を覆う壁材20が立設され、その外側に防水シート21が垂直方向に配置され、さらに外側には砂利や砕石等の埋め戻し材22が掘削部2との間に充填される。壁材20は、この外側に位置する防水シート21が貯留部10の空間に入り込むのを防止している。防水シート21は貯留部10の底面に敷いたものと同等の合成ゴム又は樹脂系シートを使用し、底面の防水シート12と漏水しないように、融着又は防水性の接着剤等で接合されている。防水シート21を砂利等の埋め戻し材22から保護するため、防水シート21の外側に壁材20と同等の保護板23を配置してもよい。
【0062】
なお、貯留施設でなく、浸透施設とする場合は、防水シート12,21の代わりに、例えばポリエステルとポリプロピレンの複合張合わせをした透水シートを敷設する。浸透型の施設の場合、貯留部に溜まった雨水等を徐々に地面に浸透させる。また、貯留と浸透の両方の機能を持たせる場合は、底面を防水シート12とし、側面の途中まで防水シート21を敷設し、側面の途中から上を透水シートで覆うようにする。この貯留浸透型の施設の場合、上半分の透水シートから雨水等を徐々に地面に浸透させ、下半分は貯留して利用する。
【0063】
貯留部上部には、周辺に降った雨水等を集める側溝等からの導水管25が接続される。そして導水管25の途中には泥溜め枡26が設置され、雨水中の砂や泥が沈殿され、上澄み水が貯留部10に導水管25によって導入される構成となっている。導水管25は複数本が泥溜め枡26から延出して貯留部10の壁材20と防水シート21を貫通して等間隔に挿入されている。なお、複数の導水管25は、その長さを変えて貯留部10の奥に雨水を流入させるように構成してもよい。これにより、貯留部10の長辺方向に沿って均一に雨水等を導入することができる。
【0064】
貯留部の上部からオーバーフロー管27が突出しており、貯留部10の下部からはオリフィス管28が突出している。オーバーフロー管27は貯留部10が満水に近い状態となると上部から放流するものである。オリフィス管28は貯留部10に溜められた雨水を徐々に流出させるものであり、オリフィスの径を調整して流出量を調整できる。貯留部10に溜まった雨水を利用するときには、貯留部10内の雨水をポンプで汲み上げて、植木への散水や洗車用水として利用することもできる。
【0065】
貯留部10の上部開口は被覆部材40が覆っている。被覆部材40は多数の第2の充填部材30Bの上部に載置される被覆ボード41と、この上に敷設された防水シート42と、この上に埋め戻された埋め戻し層43とから構成される。被覆ボード41は、図示していないが第2の充填部材30Bの上部の連結部が嵌合する凹部を有すると第2の充填部材30Bに安定して載置できて好ましい。被覆ボード41の角型マンホール15,16に対応する位置に連通口17を固定する。そして、防水シート42を連通口17に接合すると共に、防水シート42と側面の防水シート21は重ね合わせて側面で接合する。これにより凹窪部11は、角型マンホール15,16と、連通口17を通して地面に開口し、連通口17から洗浄水やバキューム等のホースを挿入して凹窪部11にホースの先端を到達させることができる。連通口17は通常は図示していない蓋により閉じられている。なお、防水シート42の上に、保護ボード44や保護シートを敷くようにしてもよい。
【0066】
このようにして貯留部10は、底面の防水シート12と、側面の防水シート21とにより、雨水等を貯留することができ、防水シート12,21と上面の被覆部材40の防水シート42とにより内部空間が構成される。そして、被覆部材40の埋め戻し層43により、地面1と同じ平面に埋め戻される。なお、貯留部10の上部の防水シート42を透水シートで構成し、貯留部10の上部に降った雨水を埋め戻し層43、透水シート、被覆ボード41を通して直接、貯留部10に貯留するようにしてもよい。また、被覆部材は前記の構成に限らず、第2の充填部材30Bの上部に単にコンクリート板等を並べるような構成でもよい。
【0067】
【発明の効果】
本発明の雨水等を貯留及び/又は浸透する施設は、貯留槽の底部に雨水等を重力により所望の方向に誘導する誘導手段を備えた第1の充填部材が配設され、その上部に所定の空隙率を有しかつ上下左右に連設して地中に埋設しても充分な強度を有する第2の充填部材が配設され、施設全体が地中に埋設されているので、雨水と共に流入し第2の充填部材を通過した砂等の異物は、第1の充填部材に到達した後に、重力により、第1の充填部材の誘導手段によって所定の位置に砂等の異物が誘導される。従って、所定の位置にU字溝等の凹部を設け、その凹部の一部に地上に通じるマンホールを設けることにより、貯留施設内の砂等を容易に除去することができる。従って、砂等の異物堆積による貯留槽内の雨水貯留量低下を防止することができる。
【0068】
更に、第1の充填部材の上に第2の充填部材が積み重ねて配置されており、第2の充填部材自体が合成樹脂製であって高強度でありかつ軽量である故に、メンテナンス等で充填部材を撤去しなければならなくなった場合にでも、その撤去や再積み重ね作業時の取り扱いが容易であり、施工性が良い。
【0069】
又、第2の充填部材が、貯留槽に流入した雨水等を第1の充填部材上に分配し、分配された雨水に含まれる砂等の堆積物は、第1の充填部材の誘導手段により、貯留槽内周部や底部の全面に広がらず、所定の位置に堆積させることができるため、堆積物による透水性シートの目詰まりを防止でき、浸透施設の場合に地下浸透能力を低下させる等の問題を解消することができる。
【0070】
更に、清掃時に作業員が入ることができる程度の巨大な空間の枠体を施工する必要がなく、施設のほとんどを軽量の合成樹脂製部材で構成できるため、施工、撤去が容易となる。
【図面の簡単な説明】
【図1】本発明に係る雨水等を貯留及び/又は浸透する施設の一実施形態の断面図である。
【図2】図1の断面図である。
【図3】図1のA−A線断面図である。
【図4】図1の施設に使用する第1の充填部材の上方の斜視図である。
【図5】図1の施設に使用する第1の充填部材の下方の斜視図である。
【図6】(a)は図4のB−B線断面図、(b)は図4のC−C線断面図。
【図7】図1の施設に使用する連結部材を示し、(a)は上方の斜視図、(b)は下方の斜視図。
【図8】(a)は図7の連結部材を2つ組んだ状態の斜視図、(b)は4つ組んだ状態の斜視図。
【図9】(a)は図7の連結部材を2つ組んだ状態の平面図、(b)は4つ組んだ状態の平面図。
【図10】波板折り板状である第2の充填部材の一例の斜視図である。
【図11】図10の積み重ね状態の一例を示す斜視図である。
【図12】連通枠状である第2の充填部材の一例の斜視図である。
【図13】連通枠体に筒状体が突設している第2の充填部材の一例の側面図である。
【図14】連通枠体に筒状体が突設している第2の充填部材の別の一例の側面図である。
【図15】区画枠体である第2の充填部材の一例の斜視図である。
【図16】図15の区画枠体の別の一例の平面図である。
【図17】図15の区画枠体の更に別の一例の平面図である。
【図18】有孔底部と側板で構成された第2の充填部材の一例の斜視図である。
【図19】図18の積み重ね状態の一例を示す平面図である。
【図20】図18の積み重ね状態の別の一例を示す側面図である。
【図21】有孔パイプ状である第2の充填部材の一例の断面図である。
【図22】図21の積み重ね状態の一例を示す側面図である。
【符号の説明】
1 地面
2 掘削部
3 基礎部
10、10A 貯留部
11 凹窪部
11A U字溝(凹窪部)
12 防水シート
13 保護ボード
14 フレーム
15、15A,16,16A 角型マンホール(連通路)
17 連通口
20 壁材
21 防水シート
30A 第1の充填部材
30B 第2の充填部材
31 連結部
32 傾斜板部(誘導手段)
33 補強リブ(補強部)
34 開放部
35 連結部材
38 接合部
38a 接合凸部
38b 接合孔
39 仕切板
40 被覆部材
41 被覆ボード
42 防水シート
43 埋め戻し層
51,52 補強リブ(補強部)
53 突部
54 貫通孔(開放部)
150 山形部材
151 山形部
152 山部
153 谷部
154 山部貫通孔
155 谷部貫通孔
200 連通枠状部材
201 合成樹脂製支柱要素
202 合成樹脂製連結要素
203 支柱嵌合部
204 上向き嵌合部
205 下向き嵌合部
206 合成樹脂製枠材
207 連結部
301 基盤部
302 筒体部
303 係合用凹凸模様
400 区画枠体
401 枠壁
402 区画
500 容器型充填材
501 側面
502 底面
503 貫通孔
504 解放側辺縁部
505 外向きリブ
600 パイプ状充填部材
601 表面
602 山部
603 貫通孔
S、S1〜S4 傾斜方向(誘導方向)
S5 旋回流
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a facility for storing and / or penetrating rainwater and the like, and more particularly to a facility for storing and / or penetrating rainwater and the like which can efficiently remove sand and the like flowing in together with the rainwater.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a large-scale residential land development site, regulating ponds are created at intervals and scales corresponding to the development area. This regulating pond, for example, digs down the ground by about 1 m to form a reservoir for rainwater, etc., and connects this reservoir to drains from surrounding residential areas and road gutters. Temporary storage of rainwater, etc., to prevent the accumulation of rainwater in surrounding residential areas, flooding of rivers, and outflow of sewage into rivers.
[0003]
In some cases, a permeation type storage unit is used in which the periphery of the storage unit is formed of a water-permeable sheet so that rainwater gradually penetrates into the ground. By forming the wall surface of the storage unit with a waterproof sheet in this way, by forming a water-permeable sheet, or by forming a lower portion with a waterproof sheet and forming an upper portion with a water-permeable sheet, a storage facility, a permeation facility, It functions as a storage and infiltration facility.
[0004]
As this kind of rainwater storage / penetration facility, there is a rainwater storage / penetration facility described in Japanese Patent Publication No. Hei 4-26648. The technology described in this publication is that a tank portion is formed by digging the ground, a plurality of container-like members are arranged vertically and horizontally and filled from the bottom to the vicinity of the ground line, and a covering means is provided on the top. It is characterized by having performed. Further, the container-shaped member is constituted by a bottom having a large number of holes and a peripheral side plate, and is formed in a tapered shape which becomes smaller toward the bottom.
[0005]
Further, as an apparatus for storing rainwater, there is a rainwater storage apparatus described in JP-A-2000-160606. The technology described in this publication is that, inside a water tank formed by digging down the ground, a synthetic resin filler having a plurality of columns is arranged vertically and horizontally and stacked vertically and filled, and a covering means is provided thereon. A water sprinkling pipe having a plurality of water injection holes at least between columns of a synthetic resin filling body formed at a bottom surface of a water storage tank and having a groove for discharging solid content, or a large number of exhaust pipes. An aeration pipe having holes is provided, and an object of the present invention is to provide a rainwater storage device which can easily remove solid matter deposited on a packing body and is easy to maintain.
[0006]
Japanese Patent Application Laid-Open No. 2001-90167 discloses a facility for storing and infiltrating rainwater or the like which is provided with a property of removing soil and the like accumulated in the storage tank. According to the technology described in this publication, a base frame provided with a space enough for an operator to enter at the time of cleaning is installed at the bottom of the water tank forming recessed portion, and the water storage space forming construct is attached to the base frame. It is characterized in that it is placed and laminated in a communicating state on the upper side, and the upper surface thereof is buried by covering soil.
[0007]
[Problems to be solved by the invention]
By the way, the infiltration facility for rainwater and the like described in Japanese Patent Publication No. Hei 4-26648 has a mud reservoir in the inflow section to prevent sand and sludge from flowing into the storage section together with the rainwater. During use, sand and sludge that have passed through the mud pool will settle and accumulate on the bottom of the reservoir. The storage section is filled with container-like members arranged vertically and horizontally and vertically, and it is difficult to remove accumulated sand and sludge. For this reason, there is a possibility that the internal volume of the storage portion gradually decreases and the amount of rainwater stored decreases, and if the internal volume becomes extremely small, the reservoir does not function as a regulating pond. In such a case, it takes time and labor to excavate the existing regulating pond, clean the filling member after removing it, and then re-install the filling member. In addition, a new storage and infiltration facility will be created as needed, and new land will be required, which will hinder the effective use of land.
[0008]
Furthermore, in Japanese Patent Publication No. Hei 4-26648, foreign matter such as earth and sand contained in rainwater flowing into the tank accumulates on the bottom surface and embeds the filling member, and the amount of stored rainwater and the like is reduced. Decreases. Alternatively, there is a problem that the sediment gets into the eyes of the water-permeable sheet on the inner peripheral portion or the bottom portion, causing clogging, and the ability to penetrate underground decreases.
[0009]
Further, the rainwater storage device described in Japanese Patent Application Laid-Open No. 2000-160606 has a complicated structure because a water sprinkling pipe and an air diffusing pipe are separately disposed inside the water storage tank, which complicates the production of the apparatus and increases the cost. There is a problem. Further, since the water sprinkling pipe and the air diffusing pipe are located in the water storage tank, there is a problem that the porosity of the water storage tank is correspondingly reduced and the water storage amount is reduced. Furthermore, when removing the solids deposited on the filling body with a sprinkler pipe, it is necessary to empty the water storage tank and spray high-pressure water from the sprinkler pipe.
[0010]
Japanese Patent Application Laid-Open No. 2001-90167 solves the problem of Japanese Patent Publication No. Hei 4-26648, but since the base frame needs a function of holding sand or the like, at least the bottom part has an opening. It is not expected that the rainwater will penetrate underground from the bottom. Even if the bottom is provided with a water-permeable hole or a water-permeable frame-shaped opening which does not hinder the penetration of rainwater but has a filter function, sediment or the like accumulates and the water-permeable ability is reduced due to clogging. Further, it is necessary to use a frame having a huge space enough for an operator to enter at the time of cleaning, and there is a problem that its construction and removal are difficult.
[0011]
The present invention has been made in view of such a problem, and an object of the present invention is to guide sand and sludge flowing together with rainwater to a predetermined place to collect the sand and sludge deposited at this place. Can be sucked out with a vacuum or the like, and can be washed and removed. Even if sand etc. accumulates in the storage part after long-term use, it can be removed, and rainwater etc. that can secure sufficient internal volume Storage and / or penetration facilities.
[0012]
Also, in a storage and / or infiltration facility for rainwater or the like, a concave portion formed by guiding sand or sludge flowing into the storage unit together with rainwater in a certain direction together with rainwater, and forming sand or sludge at a predetermined position on the bottom of the facility. The present invention is to provide a filling member that is guided to accumulate and facilitate removal of accumulated sand and sludge. When stacking the filling member in the rainwater storage section, the filling member has a large strength and can be stably stacked by the builder on the filling member, and the construction work using the filling member is performed. An object of the present invention is to provide a facility for easily storing and / or penetrating rainwater or the like that can be easily performed.
[0013]
[Means for Solving the Problems]
The facility for storing and / or penetrating rainwater or the like according to claim 1 of the present invention for solving the above-mentioned problem is a facility for storing and / or penetrating rainwater or the like underground, and is provided at the bottom of the storage tank. A first filling member provided with a guiding means for guiding rainwater or the like in a desired direction by gravity and / or rainwater flow is disposed, and has a predetermined porosity at an upper portion thereof and is connected to the ground vertically and horizontally. A facility for storing and / or infiltrating rainwater or the like, characterized in that a second filling member having sufficient strength is provided even when buried therein, and the entire facility is buried underground.
[0014]
According to the configuration of claim 1, the sand or the like that has entered the storage tank together with the rainwater is guided by the guiding means provided on the first filling member provided at the bottom of the storage tank for guiding rainwater or the like in a predetermined direction. It is guided to a predetermined direction and position by the means. For this reason, the sand and the like that have entered the storage tank together with the rainwater are collected at a predetermined position without spreading over the entire bottom of the storage tank, which may cause clogging of a water-permeable sheet used at the bottom of the storage tank. Can be avoided.
[0015]
Further, if all of the first and second filling members are made of a lightweight synthetic resin, construction and removal are easy, and the removed members can be reused and recycled. Although the total height of the first filling member is not particularly limited, it is preferably 50 cm or more in order not to lower the induction performance of sand or the like. The above-mentioned synthetic resin is, for example, a thermoplastic resin such as polypropylene, polyethylene, vinyl chloride resin, polyethylene terephthalate resin, and foams thereof, or a blend thereof, or a filler or an inorganic filler. A material to which a material is added may be used.
[0016]
In claim 2, the first filling member includes an inclined plate portion for guiding rainwater or the like flowing into the storage portion in a predetermined direction. According to this configuration, sand, small gravel, and the like, which are solids that flowed into the storage unit together with the rainwater, are guided in a predetermined direction by the inclined plate portion of the filling member, and are formed in the concave portion formed at the bottom of the storage unit. At a predetermined location. Then, when the deposited sand or the like exceeds a certain amount, it can be removed from the communication path or the like that opens to the ground using a vacuum tube or the like, and thus a predetermined storage amount of the storage unit can be secured.
[0017]
In claim 3, the first filling member includes a connecting portion that allows the filling members to be vertically stacked, and an inclined plate portion that guides rainwater or the like flowing into the storage portion in a predetermined direction, A reinforcing portion is formed on a lower surface of the inclined plate portion. According to this configuration, solids such as sand that has flowed into the storage unit together with the rainwater are guided in a predetermined direction by the inclined plate portion of the filling member, and are transferred to a predetermined location such as a concave portion formed at the bottom of the storage unit. Since it is dropped and deposited and can be easily removed, a predetermined storage amount in the storage section can be secured. In addition, when stacking this filling member in the storage section of the facility, the filling member is not damaged even when a person works on the upper surface of the inclined plate portion, and it is deformed even if a person's weight is added to the inclined plate portion. Since there is little work, the work can be performed stably and the work efficiency is improved.
[0018]
The reinforcing portion is a reinforcing rib formed on a lower surface of the inclined plate portion, and the inclined plate portion has a space of a lower opening surrounded by the reinforcing rib, and an open portion communicating with an upper portion of the space is formed by the opening portion. It is formed on a reinforcing rib and / or the inclined plate portion. According to this configuration, when rainwater gradually enters the storage section and rises in water level, air remains in the space of the lower opening surrounded by the reinforcing ribs, but this air rises from the opening and is exhausted. Since rainwater can enter the inside, the storage section can be filled with rainwater, and the storage amount of rainwater can be prevented from decreasing.
[0019]
The open portion is formed by a through hole penetrating the inclined plate portion, and a projection is formed around the through hole on the upper surface side of the inclined plate portion. According to this configuration, since the open portion of the space can be formed without dividing the reinforcing ribs, the strength of the inclined plate portion can be further improved, and the protrusion formed around the upper surface side of the inclined plate portion of the through hole causes sand or the like. Can be prevented from falling through the through-hole, and the protrusion is prevented from slipping because it grips the shoe or the like of the builder, thereby improving workability and improving work efficiency. The projection is preferably formed by a spherical surface or a conical surface.
[0020]
In claim 4, a partition plate for passing rainwater, sand and the like is provided above the first filling member, and the upper surface of the first filling member is substantially horizontal. Therefore, since the second filling member further disposed thereon is stably placed, the filling member does not move even when rainwater or the like flows.
The partition plate is not particularly limited as long as it has a function of passing rainwater, sand, etc., but a pallet-shaped frame having a large number of holes is preferable. In addition, it is preferable that the upper surface be flat so that the second filling member made of synthetic resin can be easily installed on the upper part of the partition plate. Further, it is preferable to provide a joint portion by fitting or the like with the first filling member at the bottom so that the position of the partition plate can be easily determined.
[0021]
According to a fifth aspect, the second filling member has a corrugated folded plate shape. Therefore, even if the second filling member is stacked high, the lower member is not compressed and crushed by the weight of the upper member.
In order to supplement the strength, the corrugated plate is preferably reinforced with a wall or the like. Although the size of the second filling member is not particularly limited, it is the same size as the first filling member, or the same size as the first filling member by combining the second filling member, or the first filling member. It is preferable that the size be an integral multiple of the size of the filling member.
[0022]
In claim 6, the second filling member includes a base having a communication frame shape, a member having a cylindrical body protruding from a board surface of the base, or two second filling members. A unit in which the cylindrical bodies are vertically connected with each other facing each other is defined as one unit, and a plurality of units are combined. In this case, the cylindrical member prevents the lower member from being crushed when the second filling member is stacked, and rainwater or the like passes through the through hole provided in the board surface or the cylindrical member. Sand and the like are movable.
The base portion presenting the communication frame and the cylindrical portion protruding from the board surface of the base portion may be integrated or assembled with another member. The cylindrical shape is not particularly limited, and examples include a cylindrical shape, a prismatic shape, a polygonal prism shape, and the like. Further, in order to supplement the strength of the cylinder, a partition wall may be provided inside the cylinder. Although the size of the second filling member is not particularly limited, it is the same size as the first filling member, or the same size as the first filling member by combining the second filling member, or the first filling member. It is preferable that the dimension be an integral multiple of
[0023]
In claim 7, the second filling member is a partition frame. In this case, since the frame body is resistant to compression in the height direction, the members located below are prevented from being crushed when the second filling member is stacked, and the frame body is vertically moved. Rainwater, sand, etc. can move.
The size, number, and planar shape of the sections are not particularly limited. For example, the planar shape may be configured by individually selecting a honeycomb shape, a lattice shape, a circular shape, or the like, or may be configured by combining some of them. Although the size of the second filling member is not particularly limited, it is the same size as the first filling member, or the same size as the first filling member by combining the second filling member, or an integral multiple of the first filling member. Preferably, it is a dimension.
[0024]
In claim 8, the second filling member has a shape of a container with one opening, and has at least two or more through holes on the bottom and side surfaces of the container. In this case, the individual containers, that is, the second filling members, are alternately stacked so that the openings and the bottom surfaces are in contact with each other, or as if each container is placed on top of containers arranged in the same direction at intervals. By stacking and arranging the next container, it is possible to prevent the member located below from being crushed when the second filling member is stacked, and to prevent rainwater or rainwater from passing through the provided through hole. Sand and the like are movable.
The second filling member is not particularly limited as long as it has a container shape composed of a bottom portion and a peripheral side plate, and examples thereof include a basket shape and a transport container shape such as a beer bottle. In addition, the hole may have a size that allows rainwater to flow in or out, and allows the air inside to escape, and is 19 mm. 2 The above is preferable. The number of holes may be two or more per member, but the larger the number is, the more the porosity is increased, the weight of the member is reduced, and the speed of swallowing rainwater is improved.
[0025]
In the ninth aspect, the second filling member is a perforated pipe shape, and the pipe body whose wall is made uneven by a plurality of annular or spiral grooves or folds along the circumferential direction of the pipe is provided. The upper and lower tubes are stacked so that their axial directions are different from each other. In this case, since the pipes are circular, they can support a load from above, and when stacked, the pipes located below will not be crushed, and rainwater and sand will flow through the pipes and move. It is possible.
The second filling member may or may not necessarily have holes, but is desirably provided with many holes to increase the porosity, reduce the weight of the member, and improve the speed of swallowing rainwater. .
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a facility for storing and / or penetrating rainwater or the like according to the present invention will be described with reference to the drawings. In the present embodiment, a storage facility for storing rainwater and the like will be described. The facility that penetrates rainwater or the like is not particularly described since no sheet is used or only a water-permeable sheet is used at the bottom and / or the side of the storage tank of this facility.
[0027]
1 is a cross-sectional view of a storage facility for rainwater and the like according to the present embodiment, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. However, since the details of the second filling member are shown in FIG. 4 and subsequent figures, only the first filling member is shown in FIGS. 1 to 3, and only the arrangement position is shown for the second filling member. Only.
[0028]
In FIGS. 1 to 3, a storage facility for rainwater or the like temporarily stores rainwater when heavy rain falls, and has a runoff suppressing effect of preventing a rapid increase in river flow. The stored rainwater or the like can be used as water for watering plants, water for car washing, water for daily life in emergency, or water for fire prevention. The storage part 10 formed by digging the ground 1 and the inside of the storage part 10 A plurality of first filling members 30A which are arranged in a horizontal direction and vertically stacked, a partition plate 39 which is placed on the top of the filling member 30A and covers the upper part of the storage part 10, and a storage part on the upper part thereof 10 and a second filling member 30 </ b> B installed in the inside.
[0029]
The storage unit 10 forms the excavation unit 2 by digging the ground 1 into a rectangular shape at a depth of, for example, about 1 to 10 m, and forming the excavation unit 2. I have. The bottom surface of the storage unit 10 is basically a flat surface, and a concave portion 11 which is one step lower than the flat surface is formed at the center of the bottom surface in the long side direction. The concave portion 11 is formed over the entire width of the bottom surface in the short side direction. A waterproof sheet 12 is laid on the bottom surface of the concave portion 11 and the entire bottom surface of the storage portion 10. As the waterproof sheet 12, a synthetic rubber or resin sheet or an asphalt sheet having a thickness of 1.5 mm or more is used. A lattice-shaped frame 14 is fitted into the concave recess 11 on the bottom surface of the storage unit 10, and the entire bottom surface of the storage unit 10 is substantially flat.
[0030]
In addition, you may make it lay the protection board 13 on the base part 3 formed from split stone etc., and lay the waterproof sheet 12 on it. In addition, instead of the protection board 13 described above, a base sheet (not shown) such as a polyester non-woven fabric sheet is laid under the waterproof sheet 12 as necessary, and the waterproof sheet 12 is cut from the split stone of the base portion 3. You may protect it. Furthermore, a plurality of concave portions may be formed in accordance with the size of the storage portion, and rainwater may be guided to the plurality of concave portions by a later-described inclined plate portion of the filling member 30A.
[0031]
A large number of filling members 30 </ b> A are horizontally arranged on the bottom surface of the storage unit 10, which has been made substantially flat as described above, and are placed one above the other. In the present embodiment, as shown in FIG. 2, the storage unit 10 has a space for arranging 20 filling members 30 </ b> A in one stage, and removes 18 units except for two locations corresponding to both ends of the concave portion 11. They are arranged side by side in one stage. In this state, the first filling members 30A are directly stacked in three stages to have a small pitch, and the first filling members 30A are arranged in two stages, and the connecting members 35 (see FIGS. 7, 8 and 9) are sandwiched therebetween. They are stacked to form a large pitch and are filled in the storage section 10 at the bottom of the storage tank to secure a storage space for rainwater or the like.
[0032]
Square manholes 15 and 16 communicating with the concave recess 11 are provided in a space vertically penetrating the storage section 10 from which the two filling members are removed. Then, rainwater guided by the inclined plate portion of the first filling member 30A is guided to the recessed portion 11 together with sand or the like and falls. The rectangular manholes 15 and 16 are used as a space for passing a vacuum pipe or a pipe for injecting cleaning water when removing deposits such as sand deposited on the concave recesses 11.
[0033]
As shown in detail in FIGS. 4 to 6, the first filling member 30 </ b> A is formed of a plastic such as polyethylene, polypropylene, vinyl chloride, or polyethylene terephthalate, or a waste plastic thereof, and covers the upper part of the storage unit 10. 2 supporting the vertical load of the filling member 30 </ b> B and the covering member 40 and the horizontal load due to the water pressure, and has four columnar connecting portions 31 for securing the space of the storage portion 10 and a horizontal surface fixed to the four connecting portions 31. And an inclined plate portion 32 which is inclined at an angle of about 5 degrees with respect to.
[0034]
The inclined plate portion 32 is formed of a thick plate material having a thickness of about 4 to 5 mm, and constitutes guiding means for guiding inflow of rainwater or the like in a predetermined direction. The inclination direction S of the inclined plate portion 32 is a direction in which the tip of the arrow is low, and when the inclination angle is gentle, the sand or the like stays without flowing along with the rainwater and the inclination angle is preferably about 5 degrees. The size of the filling member 30 </ b> A includes, for example, a square inclined plate portion 32 having a side of about 50 cm to 1 m, and a connecting portion 31 extending vertically at four corners of the inclined plate portion. It is formed of a triangular prism of about 15 cm, and has a shape that can be accommodated in a rectangular parallelepiped having a side of about 50 cm to 1 m and a height of about 10 to 15 cm.
[0035]
Note that the size of the first filling member 30A may be about 30 cm on one side or 1 m or more on one side. In addition, although the inclined plate portion 32 of the first filling member 30A shows an example in which a flat plate is inclined, a curved surface that is not a flat plate but is gently recessed in the inclined direction or gently bulged in a convex shape may be used. Alternatively, a stair-like inclined surface in which small steps are continuously sloped may be used. Further, it may be constituted by an inclined surface which changes in the middle from a steep gradient to a gentle gradient.
[0036]
The connecting portion 31 is formed of a thick plate material having a thickness of about 4 to 5 mm, and a triangle having a small cross section which fits inside the upper column portion 31 a is provided below the upper column portion 31 a having a large cross section. A pipe-shaped lower pillar 31b is formed. Therefore, the lower pillars 31b of the other first filling members 30A are fitted inside the upper pillars 31a of the first filling member 30A so that the filling members 30A have a small pitch, that is, the height of the connecting portion 31 is smaller. Can be stacked on pitch. Through holes 31c and 31d are formed vertically on the bottom and side surfaces of the triangular pipe-shaped connecting portion 31 so that rainwater can enter through the lower through hole and internal air can escape from the side through hole. it can. Note that the lower pillar portion 31b may have a continuous corner portion, although the corner portion is notched. Further, it is preferable that the bottom surface in the connecting portion 31 is inclined in the direction of the through hole on the side surface in order to guide soil and the like to the inclined plate portion 32.
[0037]
A reinforcing portion is formed on the lower surface of the inclined plate portion 32, and the upper surface is a flat and gentle inclined surface. As the reinforcing portion, a grid-like reinforcing rib 33 is formed integrally and vertically standing at predetermined intervals. The reinforcing rib 33 is formed such that the vertical width at the center of the inclined plate portion 32 is large, and the vertical width gradually decreases toward the periphery. With this configuration, even if a load is applied to the upper surface of the inclined plate portion 32, the deformation of the inclined plate portion 32 is reduced, and it is possible to prevent the occurrence of damage such as cracks even when a builder is placed on the upper surface. The reinforcing ribs need not be in the form of a lattice. However, the reinforcement ribs preferably have a higher strength than those in one direction, and the hexagonal honeycomb lattice is more preferable in terms of strength.
[0038]
A space of a lower opening surrounded by the reinforcing rib is formed in the reinforcing rib 33 serving as a reinforcing portion, and an opening 34 communicating with an upper portion of the space is formed. The opening 34 is configured such that a part of the reinforcing rib 33 is cut out and communicates with the space of the adjacent lower opening. With this configuration, when rainwater gradually accumulates and rises from below in the storage unit 10, the air does not remain in the space of the lower opening, and the air moves from the open portion 34 to the adjacent space to be replaced. Rainwater can enter, and the first filling member can be prevented from rising due to buoyancy, so that the storage unit 10 can be filled with rainwater to secure a predetermined storage amount. Note that a hole (not shown) may be formed to penetrate the upper part of the reinforcing rib 33 in the horizontal direction, instead of the open part 34 in which the reinforcing rib 33 is notched, and may communicate with each other.
[0039]
The first filling member 30A can be stacked at a large pitch by stacking the first filling member 30A above the connecting portion 31 with the connecting member 35 interposed therebetween. The connecting member 35 connects the triangular pipe-shaped connecting portions 31. As shown in FIG. 7, a large upper triangular pipe-shaped connecting portion 36 fits the lower column portion 31b of the filling member 30A, and the lower small triangular pipe-shaped connecting portion 36 has a small lower portion. The connecting portion 37 having a substantially triangular pipe shape is configured to be fitted inside the upper column portion 31a of the first filling member 30A. By adjusting the height of the first connecting member 35, the pitch at which the first filling members 30A are stacked can be arbitrarily set. Although not shown, two types of first filling members, a filling member having a large connecting portion and a small filling member, may be prepared and stacked at a small pitch or a large pitch. Although the connecting portion 37 is partially cut away, it may be continuous.
[0040]
The connecting member 35 has a horizontal joint 38 on the outer perpendicular vertical plane. On one of the vertical surfaces, a joint convex portion 38a is formed so as to protrude, and on the other vertical surface, a joint hole 38b into which the joint convex portion 38a fits is formed. The joining protrusion 38a is composed of a small-diameter portion at the base having substantially the same diameter as the joining hole and a large-diameter portion having an inclined upper end, and a slit is formed over the small-diameter portion and the large-diameter portion, The large diameter portion can be curved inward to reduce the diameter. With this configuration, the joining protrusion 38a is fitted and held in the joining hole 38b, and the connecting members 35 can be joined in the horizontal direction. The connecting member 35 is provided with an inclined partition plate for guiding earth and sand to the inclined plate portion 32, and a through hole 39 is formed at a lower position of the partition plate, so that rainwater can enter and air can be discharged. ing.
[0041]
As shown in FIGS. 8A and 9A, the connecting member 35 can join the two connecting members 35 by fitting the joining protrusion 38a of the joining portion 38 into the joining hole 38b. it can. The connecting member formed by joining the two members is used when the filling member 30 </ b> A is located on the outer peripheral side of the storage unit 10. Further, as shown in FIGS. 8B and 9B, the four connecting members 35 can be joined by fitting the joining protrusion 38a of the joining portion 38 into the joining hole 38b. In this case, it is used when the first filling member 30A is located on the center side of the storage unit 10. In addition, the projecting portion that is not used and projecting at the joining convex portion 38a may be cut with a blade or the like to be flat. When joining the first filling member 30A facing the corners of the square manholes 15 and 16, three connecting members (not shown) are joined and used.
[0042]
In the present embodiment, the first filling members 30A in a vertical line at the left end in FIG. 2 are guided so that the inclined direction S1 for guiding rainwater is directed rightward, that is, toward the central concave portion 11 of the storage portion. The first filling members 30 </ b> A in a vertical line at the right end are also arranged so that the inclination direction S <b> 1 is directed leftward toward the concave portion 11 at the center of the storage part. Then, the first filling members 30A in the second vertical line from the left end are arranged so that the inclination direction S is downward S3, rightward S1, upward S4, upward S3 in order from the top, and the second vertical line from the right end. The first filling member 30A is arranged so that the inclination direction S becomes downward S3, leftward S1, leftward S1, and upward S3 in order from the top. The first filling member 30A at the upper center is arranged so that the inclination direction S is downward S2 in the figure, and the first filling member 30A at the lower center is arranged S3 leftward.
[0043]
The above-mentioned inclination direction is determined as follows. First, the inclination direction S <b> 1 of the first filling member is directed to the concave portion 11. Second, the first filling member located above the concave portion is directed to the outflow side as in the inclination direction S2. Third, in the manhole portion which is a communication passage, rainwater escapes in another direction as in the inclined direction S3 so as not to reach a dead end. Fourth, the inclination direction is set to the inclination direction S4 so that the inclination directions of the adjacent first filling members do not face each other. As a result, in the manhole part on the outflow side, a part of the rainwater generates a swirling flow S5 turning clockwise and is configured to gradually fall from the gap of the inclined plate part. Note that the swirling flow may be clockwise and counterclockwise from the center by setting the tilt direction S3 to the right and setting the tilt direction S4 of the right first filling member to the upward.
[0044]
For this reason, the rainwater is guided by the first filling member 30 </ b> A toward the central concave portion 11 and gradually falls toward the concave portion 11 to be guided. The first filling members 30A are stacked at a small pitch in such a guiding direction, and then stacked at a large pitch. In addition, when piled up at a small pitch, the inclined plate portion 32 is continuous with the inclined plate portion 32 in the guiding direction on the lower stage side with a slight step, and can continuously guide rainwater.
[0045]
As described above, the first filling members 30 </ b> A that are consecutively provided in 18 stages in one stage and stacked in five stages have the lower half corresponding to the foundation stacked at a small pitch to increase the strength, and the upper half is large. The porosity increases with the pitch. In addition, although the first filling member 30A is unstable when it is stacked high, the upper first filling member 30A is horizontally joined at the joining portion 38 of the connecting member 35, so that the first filling member 30A is stable and easy to construct. Become. Furthermore, since the first filling member 30A is stably stacked, the second filling member 30B and the upper covering member 40 stacked on top can be stably supported, and rainwater and the like can be stored and / or stored. Alternatively, the durability of the facility that penetrates can be improved.
[0046]
The first filling member 30A is required to have a high porosity per unit volume, to have sufficient strength and durability for practical use, and to be easy to carry out and to maintain and manage. It is preferable that the load bearing capacity is, for example, 5 to 20 tons per square meter in the vertical direction, 5 to 16 tons in the horizontal direction, and a porosity of about 90%. Further, it is preferable to increase the porosity by providing a slit or a through hole in the connecting portion 31 so as to allow rainwater or the like to enter inside as described above.
[0047]
The first filling members 30A are stacked such that the upper surface is substantially horizontal and the unevenness is reduced, but there are still some cases where unevenness or the like still occurs. At that time, a partition plate 39 through which rainwater, sand, and the like pass is provided above the first filling member, and the upper surface of the first filling member 30A is substantially horizontal. The partition plate 39 is preferably made of a material that is hard to bend, has high strength and rigidity, and does not corrode. For example, plastics such as polyethylene, polypropylene, vinyl chloride, and polyethylene terephthalate, and waste plastics thereof. It should just be formed from. Further, the partition plate 39 is provided with a through hole of an appropriate size, and rain water or sand contained in the rain water which has flowed into the second filling member 30B through the through hole is directed toward the lower first filling member. It must be able to flow to.
[0048]
Thus, the first filling member is arranged, and the second filling member 30B is stacked thereon. The second filling member 30B has a predetermined porosity, has sufficient strength even if it is buried in the ground continuously and vertically and horizontally, and receives first rainwater or the like flowing into the storage tank. It is desirable to have a guiding means for guiding so as to be evenly distributed on the upper surface of the filling member.
[0049]
Similarly to the first filling member 30A, the second filling member 30B is required to have a high porosity per unit volume and to have sufficient strength and durability for practical use, and to facilitate transport construction. It is required that the maintenance is easy, and the load bearing capacity is, for example, preferably 5 to 20 tons per square meter in the vertical direction, 5 to 16 tons in the horizontal direction, and a porosity of about 90%.
[0050]
For this purpose, it is desirable to be made of a material having high strength, rigidity, and no corrosion. For example, plastics such as polyethylene, polypropylene, vinyl chloride, polyethylene terephthalate, and waste plastics thereof. Conveniently formed from
[0051]
Representative examples of the second filling member 30B are shown in FIGS. Of course, other than those shown in these figures, it is needless to say that any material having a predetermined porosity and having sufficient strength can be buried in the ground continuously and vertically and horizontally. .
[0052]
The second filling member 30B shown in FIGS. 10 and 11 is in the shape of a corrugated plate, and the peaks 102 and the valleys 103 are alternately combined to form the peak-shaped member 100. Are provided with a plurality of peak through holes 104 and valley through holes 105, respectively. The crests 102 and the troughs 103 are alternately stacked so as to be at right angles, and the lower end of the crests 101 and a part of the crests 102 are engaged with each other so that the upper and lower crests 100 do not shift from each other. Is provided. Foreign matter such as sand contained in rainwater or the like can move downward through the through holes 104 and 105.
[0053]
12, 13, and 14, a base portion having a communication frame shape and a cylindrical body protruding from the board of the base portion or two second filling members 30 </ b> B with their body portions opposed to each other. In this state, one unit connected vertically is defined as one unit, and a plurality of units are combined.
In FIG. 12, the communication frame-shaped member 200 has a structure in which a synthetic resin column element 201 is connected to a synthetic resin frame member 206 by a synthetic resin connection element 202. The frame member 206 is composed of a plurality of support fitting portions 203 and a connecting portion 206 connecting the supporting portion 203, and the connecting element 202 is configured by a fitting portion 203 having an upward fitting portion 204 and a downward fitting portion 205. I have.
[0054]
The second filling member 30 </ b> B in FIG. 13 is configured such that a plurality of cylindrical portions 302 are protruded from one surface side of the base portion 301. At the distal end of the cylindrical body, an engaging concave / convex pattern 303 is provided, and when the filling member 30B is stacked, the concave / convex fits and locks so as not to shift. The base portion and the locking portion are provided with through holes as appropriate so that foreign matter such as sand flowing in with rainwater flows downward.
[0055]
The member in FIG. 14 is an example in which the column element in the example of FIG. 12 is the cylindrical body in the example of FIG. 13, and thus detailed description is omitted.
[0056]
The second filling member 30 </ b> B in FIGS. 15, 16, and 17 is a partition frame 400. The frame wall 401 is combined vertically and horizontally to form a section 402. The shape of the section 402 is not limited to a rectangular shape as shown in FIG. 15, but also a honeycomb-like combined shape as shown in FIG. It may be arbitrary, such as a circular combination shape as described above.
[0057]
18, 19 and 20 show a container-type filler 500 having at least two or more holes and having a bottom portion and a peripheral side plate. The shape of the container has a large opening side area, and a plurality of through holes 503 are provided on the side surface 501 and the bottom surface 502, respectively. An outward rib 505 is provided on the outer edge of the open side edge portion 504 and the bottom surface 502, and a part thereof is provided with irregularities. For example, as shown in FIG. 19 or FIG. 20, when the container-type filling members 500 are stacked, the unevenness fits and locks, and acts so that they do not shift from each other.
[0058]
21 and 22 show a pipe-shaped filling member 600 whose surface 601 is made uneven by grooves or folds along an axial section, a plurality of annular grooves or folds, or spiral grooves or folds. . A plurality of through-holes 603 are provided in the peak portion 602 when viewed from the outside of the uneven shape. Foreign matter such as sand that flows in with the rainwater passes through the through hole 603 and flows downward. The method of stacking the pipe-shaped filling members 600 is not particularly limited, but it is preferable that the pipe-shaped filling members 600 be stacked so as not to collapse. For example, as shown in FIGS. 22 (a) to 22 (d), there is a method of filling one pipe so that six other pipes are in contact with each other, that is, a so-called close-packing state. At this time, if the circumference of the pipe bundle is tied so as to be loosened with a tying band (not shown) or the like, there is no fear of collapse of the load.
[0059]
The second filling member 30B exemplified above has a shape already known as a filling material used for a water storage tank. Therefore, the structure and operation thereof will not be described again, but all are lightweight. The pressure applied to the lower first filling member is small, and some of the filling members distribute rainwater and the like evenly when the rainwater or the like flows into the lower first filling member. Can be induced. Therefore, it goes without saying that the present invention is applicable as long as it has this function other than the example.
[0060]
The second filling member 30B may be stacked on top of the first filling member 30A in the same manner as when the first filling member 30A is placed on the bottom of the storage tank. The stacking height at that time may be such that the stacking height is equal to the height of the storage tank minus the height of the first filling member. Further, in a plan view, it is only necessary to be stacked directly above the first filling member as it is. Therefore, if the plane size is the same as that of the first filling member 30A, handling becomes easy.
[0061]
After the first filling member 30A and the second filling member 30B are vertically stacked and installed in 11 stages, the wall material 20 covering the side surfaces of the first and second filling members 30A is erected. A waterproof sheet 21 is vertically arranged on the outside, and a backfill material 22 such as gravel or crushed stone is further filled between the excavation section 2 and the outside. The wall material 20 prevents the waterproof sheet 21 located on the outside from entering the space of the storage unit 10. The waterproof sheet 21 uses a synthetic rubber or resin-based sheet equivalent to the one laid on the bottom surface of the storage unit 10 and is bonded to the waterproof sheet 12 on the bottom surface with a fusion or waterproof adhesive or the like so as not to leak water. I have. In order to protect the waterproof sheet 21 from the backfill material 22 such as gravel, a protective plate 23 equivalent to the wall material 20 may be disposed outside the waterproof sheet 21.
[0062]
In the case where a permeation facility is used instead of a storage facility, for example, a water-permeable sheet made of a composite laminate of polyester and polypropylene is laid instead of the waterproof sheets 12 and 21. In the case of an infiltration type facility, rainwater and the like accumulated in the storage unit are gradually infiltrated into the ground. When both functions of storage and permeation are provided, the waterproof sheet 12 is provided at the bottom, the waterproof sheet 21 is laid halfway along the side, and the upper part is covered with the water permeable sheet from the middle of the side. In the case of this storage infiltration type facility, rainwater or the like is gradually penetrated into the ground from the upper permeable sheet, and the lower half is stored and used.
[0063]
A water guide pipe 25 is connected to the upper part of the storage part from a gutter or the like that collects rainwater or the like that has fallen around. A mud basin 26 is provided in the middle of the water pipe 25, sand and mud in the rainwater are settled, and the supernatant water is introduced into the storage unit 10 by the water pipe 25. A plurality of water guide pipes 25 extend from the mud pool 26 and penetrate through the wall material 20 of the storage unit 10 and the waterproof sheet 21 and are inserted at equal intervals. The plurality of water pipes 25 may be configured such that the length thereof is changed so that rainwater flows into the interior of the storage unit 10. Thereby, rainwater or the like can be introduced uniformly along the long side direction of the storage unit 10.
[0064]
An overflow pipe 27 protrudes from an upper part of the storage part, and an orifice pipe 28 protrudes from a lower part of the storage part 10. The overflow pipe 27 discharges from the upper part when the storage part 10 is almost full. The orifice pipe 28 is for gradually discharging the rainwater stored in the storage unit 10, and the amount of the outflow can be adjusted by adjusting the diameter of the orifice. When rainwater collected in the storage unit 10 is used, the rainwater in the storage unit 10 can be pumped up and used as water for watering plants and water for car washing.
[0065]
The covering member 40 covers the upper opening of the storage unit 10. The covering member 40 is composed of a covering board 41 placed on top of a number of second filling members 30B, a waterproof sheet 42 laid thereon, and a backfill layer 43 buried thereon. You. Although not shown, it is preferable that the covering board 41 has a concave portion into which the connecting portion at the upper part of the second filling member 30B fits, since the covering board 41 can be stably placed on the second filling member 30B. The communication port 17 is fixed to the covering board 41 at a position corresponding to the square manholes 15 and 16. Then, the waterproof sheet 42 is joined to the communication port 17, and the waterproof sheet 42 and the side waterproof sheet 21 are overlapped and joined on the side. Thereby, the concave portion 11 is opened to the ground through the square manholes 15 and 16 and the communication port 17, and a hose such as washing water or vacuum is inserted from the communication port 17 to reach the tip of the hose to the concave portion 11. Can be done. The communication port 17 is normally closed by a lid (not shown). Note that a protection board 44 or a protection sheet may be laid on the waterproof sheet 42.
[0066]
In this manner, the storage unit 10 can store rainwater and the like by the waterproof sheet 12 on the bottom surface and the waterproof sheet 21 on the side surface, and is formed by the waterproof sheets 12 and 21 and the waterproof sheet 42 of the covering member 40 on the upper surface. An internal space is configured. Then, by the backfill layer 43 of the covering member 40, the backfill layer 43 is backfilled on the same plane as the ground 1. In addition, the waterproof sheet 42 on the upper part of the storage part 10 is formed of a water-permeable sheet, and rainwater falling on the upper part of the storage part 10 is stored in the storage part 10 directly through the backfill layer 43, the water-permeable sheet, and the covering board 41. You may. Further, the coating member is not limited to the above-described configuration, and may be configured such that a concrete plate or the like is simply arranged above the second filling member 30B.
[0067]
【The invention's effect】
In the facility for storing and / or infiltrating rainwater or the like according to the present invention, a first filling member provided with a guiding means for guiding rainwater or the like in a desired direction by gravity is disposed at the bottom of the storage tank, and a predetermined filling member is provided above the first filling member. A second filling member having a porosity of and having sufficient strength even when buried in the ground continuously and vertically and horizontally is arranged, and the entire facility is buried in the ground, so together with rainwater The foreign matter such as sand that has flowed in and passed through the second filling member reaches the first filling member, and then the foreign matter such as sand is guided to a predetermined position by the guiding means of the first filling member by gravity. . Therefore, by providing a concave portion such as a U-shaped groove at a predetermined position and providing a manhole leading to the ground in a part of the concave portion, sand and the like in the storage facility can be easily removed. Therefore, it is possible to prevent a decrease in the amount of rainwater stored in the storage tank due to accumulation of foreign substances such as sand.
[0068]
Further, the second filling member is stacked and arranged on the first filling member. Since the second filling member itself is made of synthetic resin and has high strength and light weight, the second filling member is filled by maintenance or the like. Even when the member has to be removed, handling during removal and restacking is easy, and workability is good.
[0069]
In addition, the second filling member distributes rainwater or the like flowing into the storage tank onto the first filling member, and deposits such as sand contained in the distributed rainwater are guided by the first filling member guiding means. , Because it does not spread over the entire inner periphery or bottom of the storage tank and can be deposited at a predetermined position, it is possible to prevent clogging of the water-permeable sheet due to sediment, and to reduce the underground penetration capacity in the case of a permeation facility, etc. Can be solved.
[0070]
Furthermore, since there is no need to construct a frame in a space large enough to allow a worker to enter during cleaning, most of the facilities can be made of lightweight synthetic resin members, which facilitates construction and removal.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a facility for storing and / or penetrating rainwater or the like according to the present invention.
FIG. 2 is a sectional view of FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIG. 4 is a top perspective view of a first filling member used in the facility of FIG. 1;
5 is a lower perspective view of a first filling member used in the facility of FIG. 1. FIG.
6A is a sectional view taken along line BB of FIG. 4, and FIG. 6B is a sectional view taken along line CC of FIG.
7A and 7B show a connecting member used in the facility of FIG. 1, wherein FIG. 7A is an upper perspective view and FIG. 7B is a lower perspective view.
8A is a perspective view of a state where two connecting members of FIG. 7 are assembled, and FIG. 8B is a perspective view of a state where four connecting members are assembled.
9A is a plan view showing a state where two connecting members of FIG. 7 are assembled, and FIG. 9B is a plan view showing a state where four connecting members are assembled.
FIG. 10 is a perspective view of an example of a second filling member having a corrugated folded plate shape.
11 is a perspective view showing an example of the stacked state of FIG.
FIG. 12 is a perspective view of an example of a second filling member having a communication frame shape.
FIG. 13 is a side view of an example of a second filling member in which a cylindrical body protrudes from a communication frame.
FIG. 14 is a side view of another example of the second filling member in which a cylindrical body protrudes from a communication frame.
FIG. 15 is a perspective view of an example of a second filling member that is a partition frame.
16 is a plan view of another example of the partition frame of FIG.
FIG. 17 is a plan view of still another example of the partition frame of FIG. 15;
FIG. 18 is a perspective view of an example of a second filling member including a perforated bottom portion and a side plate.
FIG. 19 is a plan view showing an example of a stacked state in FIG. 18;
FIG. 20 is a side view showing another example of the stacked state in FIG. 18;
FIG. 21 is a cross-sectional view of an example of a second filling member having a perforated pipe shape.
FIG. 22 is a side view showing an example of the stacked state of FIG. 21.
[Explanation of symbols]
1 ground
2 Drilling part
3 Foundation
10, 10A storage unit
11 hollow
11A U-shaped groove (concave recess)
12 Waterproof sheet
13 Protection board
14 frames
15, 15A, 16, 16A Square manhole (communication passage)
17 Communication port
20 wall materials
21 Waterproof sheet
30A first filling member
30B Second filling member
31 Connecting part
32 Inclined plate (guide means)
33 Reinforcement rib (reinforcement part)
34 Open part
35 Connecting member
38 Joint
38a Joint projection
38b Joint hole
39 Divider
40 Covering member
41 Coated board
42 tarpaulin
43 Backfill layer
51,52 Reinforcing rib (reinforcing part)
53 protrusion
54 Through-hole (open part)
150 Angle member
151 Yamagata
152 Yamabe
153 Tanibe
154 Mountain through hole
155 Valley through hole
200 communication frame member
201 Synthetic resin support element
202 Synthetic resin connecting element
203 Post fitting part
204 upward fitting section
205 downward fitting part
206 Synthetic resin frame material
207 connection
301 Base
302 cylinder
303 Uneven pattern for engagement
400 division frame
401 Frame Wall
402 section
500 Container-type filler
501 side
502 bottom
503 through hole
504 Open side edge
505 Outward rib
600 pipe-shaped filling member
601 surface
602 Yamabe
603 through hole
S, S1 to S4 Incline direction (guidance direction)
S5 swirling flow

Claims (9)

地下に雨水等を貯留及び/又は浸透する施設であって、貯留槽の底部に雨水等を重力及び/又は雨水流により所望の方向に誘導する誘導手段を備えた第1の充填部材が配設され、その上部に、所定の空隙率を有しかつ上下左右に連設して地中に埋設しても充分な強度を有する第2の充填部材が配設され、施設全体が地中に埋設されていることを特徴とする雨水等を貯留及び/又は浸透する施設。A facility for storing and / or infiltrating rainwater or the like underground, provided with a first filling member provided at a bottom portion of the storage tank and provided with a guiding means for guiding the rainwater or the like in a desired direction by gravity and / or rainwater flow. In the upper part, a second filling member having a predetermined porosity and having sufficient strength even if it is buried in the ground continuously and vertically and horizontally is disposed, and the entire facility is buried in the ground. Facilities that store and / or infiltrate rainwater, etc., characterized by being treated. 上記第1の充填部材が、前記貯留部に流入した雨水等を所定方向に誘導する傾斜板部を備えていることを特徴とする請求項1記載の雨水等を貯留及び/又は浸透する施設。The facility for storing and / or penetrating rainwater or the like according to claim 1, wherein the first filling member includes an inclined plate portion for guiding rainwater or the like flowing into the storage section in a predetermined direction. 上記第1の充填部材が、充填部材を上下方向に積み重ね可能とする連結部と、前記貯留部に流入した雨水等を所定方向に誘導する傾斜板部とを備え、該傾斜板部の下面に補強部が形成されていることを特徴とする請求項1又は2記載の雨水等を貯留及び/又は浸透する施設。The first filling member includes a connecting portion that allows the filling members to be vertically stacked, and an inclined plate portion that guides rainwater or the like flowing into the storage portion in a predetermined direction, and a lower surface of the inclined plate portion. The facility for storing and / or penetrating rainwater or the like according to claim 1 or 2, wherein a reinforcing portion is formed. 第1の充填部材の上部に雨水及び砂等を通過させる仕切り板が設置され、第1の充填部材の上面が略水平面とされていることを特徴とする請求項1乃至3記載の雨水等を貯留及び/又は浸透する施設。4. A partition plate for allowing rainwater and sand to pass therethrough is provided above the first filling member, and the upper surface of the first filling member is substantially a horizontal plane. Facilities that store and / or infiltrate. 上記第2の充填部材が、波形折板状であることを特徴とする請求項1乃至4記載の雨水等を貯留及び/又は浸透する施設。The facility for storing and / or infiltrating rainwater or the like according to any one of claims 1 to 4, wherein the second filling member has a shape of a corrugated folded plate. 上記第2の充填部材が、連通枠状を呈する基底部と、当該基底部の盤面に突設した筒状体、もしくは上記第2の充填部材2枚をその互いの胴体部を対向させた状態で上下に連結したものを一単位とし、これを複数単位組み合わせたものであることを特徴とする請求項1乃至4記載の雨水等を貯留及び/又は浸透する施設。A state in which the second filling member has a base portion having a communication frame shape and a cylindrical body protruding from the board surface of the base portion, or a body portion of the two second filling members facing each other. The facility for storing and / or infiltrating rainwater or the like according to any one of claims 1 to 4, wherein a unit connected up and down by one is defined as one unit, and a plurality of units are combined. 第2の充填部材が、区画枠体であることを特徴とする請求項1乃至4記載の雨水等を貯留及び/又は浸透する施設。The facility for storing and / or infiltrating rainwater or the like according to claim 1, wherein the second filling member is a partition frame. 第2の充填部材が、少なくとも2つ以上の孔を有し、底部及び周側板で構成した容器状部材であることを特徴とする請求項1乃至4記載の雨水等を貯留及び/又は浸透する施設。The second filling member is a container-like member having at least two or more holes and formed of a bottom portion and a peripheral side plate, and stores and / or permeates rainwater or the like according to claim 1 to 4. Facility. 第2の充填部材が、有孔パイプ状であってその表面が、軸方向断面に沿った溝又はひだ、複数の環状溝又はひだ、又は螺旋状溝又はひだにより凹凸状とされていることを特徴とする
請求項1乃至4記載の雨水等を貯留及び/又は浸透する施設。
The second filling member is in the form of a perforated pipe, and its surface is made uneven by grooves or folds along an axial section, a plurality of annular grooves or folds, or spiral grooves or folds. The facility for storing and / or infiltrating rainwater or the like according to claim 1 to 4.
JP2002207131A 2002-07-16 2002-07-16 Storage and/or permeation facility for rainwater or the like Withdrawn JP2004052243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002207131A JP2004052243A (en) 2002-07-16 2002-07-16 Storage and/or permeation facility for rainwater or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002207131A JP2004052243A (en) 2002-07-16 2002-07-16 Storage and/or permeation facility for rainwater or the like

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Publication Number Publication Date
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004105859A (en) * 2002-09-18 2004-04-08 Sekisui Chem Co Ltd Storage tank and its partition structure
JP2006183287A (en) * 2004-12-27 2006-07-13 Achilles Corp Foamed resin block body for banking
JP2006249753A (en) * 2005-03-10 2006-09-21 Takiron Co Ltd Underground water tank filler
JP2006342519A (en) * 2005-06-07 2006-12-21 Meiji Rubber & Chem Co Ltd Rainwater storage tank and bottom member therefor
JP2006342520A (en) * 2005-06-07 2006-12-21 Meiji Rubber & Chem Co Ltd Rainwater storage tank and filling body therefor
JP2007315065A (en) * 2006-05-26 2007-12-06 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP2007315026A (en) * 2006-05-25 2007-12-06 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP2007327295A (en) * 2006-06-09 2007-12-20 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP2007332679A (en) * 2006-06-15 2007-12-27 Bridgestone Corp Component member for rainwater storage and penetration tank, and rainwater storage and penetration tank
JP2011074692A (en) * 2009-09-30 2011-04-14 Sekisui Techno Seikei Kk Rainwater storage facility
JP2011196064A (en) * 2010-03-18 2011-10-06 Sekisui Techno Seikei Kk Rainwater storage facility
JP2013113068A (en) * 2011-11-30 2013-06-10 Aron Kasei Co Ltd Rainwater piping structure
JP2019073855A (en) * 2017-10-12 2019-05-16 天昇電気工業株式会社 Rainwater storage and infiltration facility

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004105859A (en) * 2002-09-18 2004-04-08 Sekisui Chem Co Ltd Storage tank and its partition structure
JP4494959B2 (en) * 2004-12-27 2010-06-30 アキレス株式会社 Foam resin block for embankment
JP2006183287A (en) * 2004-12-27 2006-07-13 Achilles Corp Foamed resin block body for banking
JP2006249753A (en) * 2005-03-10 2006-09-21 Takiron Co Ltd Underground water tank filler
JP2006342519A (en) * 2005-06-07 2006-12-21 Meiji Rubber & Chem Co Ltd Rainwater storage tank and bottom member therefor
JP2006342520A (en) * 2005-06-07 2006-12-21 Meiji Rubber & Chem Co Ltd Rainwater storage tank and filling body therefor
JP4526443B2 (en) * 2005-06-07 2010-08-18 株式会社明治ゴム化成 Rainwater storage tank
JP2007315026A (en) * 2006-05-25 2007-12-06 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP2007315065A (en) * 2006-05-26 2007-12-06 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP4612588B2 (en) * 2006-06-09 2011-01-12 積水化学工業株式会社 Rainwater storage and penetration facility
JP2007327295A (en) * 2006-06-09 2007-12-20 Sekisui Chem Co Ltd Rainwater storage and penetration facility
JP2007332679A (en) * 2006-06-15 2007-12-27 Bridgestone Corp Component member for rainwater storage and penetration tank, and rainwater storage and penetration tank
JP4584873B2 (en) * 2006-06-15 2010-11-24 株式会社ブリヂストン Component for rainwater storage and penetration tank and rainwater storage and penetration tank
JP2011074692A (en) * 2009-09-30 2011-04-14 Sekisui Techno Seikei Kk Rainwater storage facility
JP2011196064A (en) * 2010-03-18 2011-10-06 Sekisui Techno Seikei Kk Rainwater storage facility
JP2013113068A (en) * 2011-11-30 2013-06-10 Aron Kasei Co Ltd Rainwater piping structure
JP2019073855A (en) * 2017-10-12 2019-05-16 天昇電気工業株式会社 Rainwater storage and infiltration facility

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