JP2004211316A - Rainwater tank unit - Google Patents

Rainwater tank unit Download PDF

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Publication number
JP2004211316A
JP2004211316A JP2002379396A JP2002379396A JP2004211316A JP 2004211316 A JP2004211316 A JP 2004211316A JP 2002379396 A JP2002379396 A JP 2002379396A JP 2002379396 A JP2002379396 A JP 2002379396A JP 2004211316 A JP2004211316 A JP 2004211316A
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Japan
Prior art keywords
sheet
rainwater
tank unit
rainwater tank
skeleton
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JP2002379396A
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JP3991270B2 (en
Inventor
Takeshi Tsurumoto
健 鶴本
Hideo Shimada
秀男 島田
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Takiron Co Ltd
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Takiron 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 a rainwater tank unit of good workability and handlability, shortening a construction period, reducing a construction cost and preventing floating. <P>SOLUTION: This rainwater tank unit buried in the ground is provided with a bottom plate 1; a skeleton body built up by arranging stacked members 2 longitudinally and laterally and stacking them in a plurality of stages on the bottom plate and having water storage cavities; a water permeable upper face sheet 4 covering the upper face of the skeleton body; a covering sheet 5 for covering at least four peripheral side faces of the skeleton body; and a fixing means 6 for fixing the covering sheet 5 to the bottom plate 1. Because of being a unit, workability and handling performance are good, a construction period can be shortened, and a construction cost can be reduced. Furthermore, since the bottom plate 1 functions as a floating preventive plate, floating can be prevented. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、地中に埋設される施工性の良好な雨水槽ユニットに関する。
【0002】
【従来の技術】
未舗装の道路や空地が殆どない都市化の進んだ地域では、雨水が地中に浸透することなく側溝等を通じて河川へ流れ込むため、雨季には大量の雨水が河川へ集中し、短時間で河川の容量を越えて、いわゆる都市型洪水を引き起こしている。一方、乾季にはダムや湖の水位が低下して水不足となり、各地で水道水の給水制限が実施されている。
【0003】
斯かる事情に対処するため、雨水浸透用の雨水槽を地中に設けて、雨水を該雨水槽へ導入したのち地中に徐々に浸透させたり、雨水貯溜用の雨水槽を地中に設けて、該雨水槽に貯溜した雨水を有効利用することが試みられている。
【0004】
図12及び図13は、本出願人が開発した雨水浸透用又は雨水貯溜用の雨水槽の従来例を示す概略断面図であって、図12は埋設前の状態を、図13は埋設後の状態を示している。
【0005】
この雨水槽は、図12に示すように、地面を掘削して形成した大きい凹空部100の底に、砕石層101と砂層102を設けて不陸をなくし、凹空部100の内側に敷設した被覆シート103の上に、多数の積重ね部材104を縦横に並べて複数段積み重ね、この積重ね部材104の集合体の底面と四周側面を図13に示すように被覆シート103で被覆すると共に、積重ね部材104の集合体の上面を透水シート105で被覆し、雨水の流入管(不図示)や取水管(不図示)を接続して凹空部100を土で埋め戻すことにより、上記シート103,105で被覆された積重ね部材104の集合体を地中に埋設したものである。積重ね部材104としては、梁体の裏面に複数の脚を取付けた合成樹脂製の積重ね部材が使用され、このような積重ね部材を縦横に並べて複数段積み重ねると、耐圧強度が大きく貯水空隙率が高い積重ね部材の集合体を組み立てることができる。
【0006】
上記の雨水槽は、被覆シート103が透水性のシートであれば雨水浸透用の雨水槽となり、槽内に導入された雨水を透水性の被覆シートを通じて周囲の地中へ徐々に浸透、排水することができる。一方、被覆シート103が遮水性のシートであれば雨水貯溜用の雨水槽となり、遮水性の被覆シートの内側に雨水を貯溜することができる。
【0007】
【発明が解決しようとする課題】
しかしながら、上記の雨水槽は、施工現場で積重ね部材104を縦横に並べながら複数段積み重ねて集合体を組み立てるのに手間がかかること、積重ね部材104の集合体を被覆シート103や透水シート105で被覆してシートの継目を溶着するのが面倒であること、等の理由から施工性が良いとは言い難く、かなりの施工日数がかかるという問題があった。
【0008】
また、上記の雨水槽のように、施工現場で積重ね部材104の集合体を組み立ててシートで被覆する場合は、作業上、積重ね部材104の集合体の周囲の余掘り量を大きくする必要があるため、積重ね部材104の集合体よりもかなり大きい凹空部100を掘削しなければならず、それに要する費用がかさむという問題もあった。
【0009】
更に、凹空部100の底面に不陸があると、積重ね部材14を整然と積み重ねることができないため、砕石層101の上に砂層102を設けて不陸をなくす必要があり、それに要する費用も嵩むという問題があった。
【0010】
また、地下水量の多い場所に上記の雨水槽を埋設すると、槽内の雨水量が少ない場合には、地下水の浮力によって雨水槽が浮上するという問題もあった。
【0011】
本発明は上記の問題に対処すべくなされたもので、その目的とするところは、施工性や取扱い性が極めて良く、工期の短縮や工費の節減を図ることができ、浮上を防止することもできる雨水槽ユニットを提供することにある。
【0012】
【課題を解決するための手段】
上記目的を達成するため、本発明の雨水槽ユニットは、地中に埋設されるユニットであって、底板と、この底板の上に設置される貯水空隙を有する骨格体と、この骨格体の上面を覆う透水性上面シートと、この骨格体の少なくとも四周側面を覆う被覆シートと、この被覆シートを上記底板に固定する固定手段とからなることを特徴とするものである。
【0013】
この雨水槽ユニットは、底板の上に貯水空隙を有する骨格体が設置されて透水性上面シートと被覆シートで被覆されているため、従来のように施工現場で積重ね部材を積み重ねて集合体を組み立てたり被覆シート等で被覆する作業が一切不要となり、余掘り量を少なくすることもできる。そのため、底板より少し大きい開口面積の凹空部を地面に掘削して雨水槽ユニットを設置し、土を埋め戻すだけで極く簡単に埋設施工することができる。そして、凹空部の底面に多少の不陸があっても、底板によって不陸を吸収できるため、従来の不陸調整用の砂層を省略することも可能となる。このように、本発明の雨水槽ユニットは、施工性が極めて良いため工期の短縮や工費の節減を図ることができ、また、ユニットごと運搬、荷降ろし、移動、設置等ができるので取扱い性や作業性も良好である。更に、本発明の雨水槽ユニットは、地中に埋設したときに底板の四周縁が周囲の土に食い込んで浮上防止板の役割を果たすため、地下水の浮力等を受けても浮上する心配がない。
【0014】
本発明の雨水槽ユニットにおいては、骨格体の上面と四周側面に通水孔を有する板体を取付けることが望ましい。このようにすると、骨格体上面の板体によって上方からの土圧や荷重が受け止められると共に、四周側面の板体によって周囲からの土圧が受け止められるため、透水性上面シートや被覆シートを破って土砂が槽内へ侵入するのを阻止することができる。
【0015】
本発明の雨水槽ユニットは、被覆シートが遮水性であるか透水性であるかによって、雨水貯溜用のユニットにも雨水浸透用のユニットにもなるものである。即ち、被覆シートとして遮水性のシートを用いて骨格体の四周側面を被覆すると共に、該シートの下端縁を前記の固定手段で水密的に底板に固定すれば、雨水貯溜用の雨水槽ユニットになり、遮水性の被覆シートと底板とで囲まれた槽内空間に雨水を貯溜することができる。また、被覆シートとして遮水性のシートを用いて骨格体の四周側面と底面を被覆する場合も、雨水貯溜用の雨水槽ユニットになり、この四周側面と底面を被覆する遮水性の被覆シートで囲まれた槽内空間に雨水を貯溜することができる。これに対し、被覆シートとして透水性のシートを用いると雨水浸透用の雨水槽ユニットになり、槽内に導入された雨水を透水性の被覆シートを通じて周囲の土中に浸透、排水することができる。
【0016】
上記の雨水貯溜用の雨水槽ユニットでは、骨格体の一側面の上部から外方へ突き出す流入口を設け、他の一側面の下部から外方へ突き出す取水口を設けることが望ましい。このようにすると、地面に掘った凹空部に雨水槽ユニットを設置してから雨水導入管と取水管を簡単に接続できるので、施工性が更に向上する。
【0017】
また、上記の雨水浸透用の雨水槽ユニットでは、骨格体の一側面の上部から外方へ突き出す流入口を設けることが望ましく、このようにすると、地面に掘った凹空部に雨水槽ユニットを設置してから雨水の流入管を簡単に接続できるので、施工性が一層向上する。
【0018】
また、本発明の雨水槽ユニットにおいては、骨格体の上面から上方に突き出す点検口を設けることが望ましく、このようにすると、点検口から槽内を目視したり、点検用カメラを挿入するなどして、槽内の点検を簡単に行うことができる。
【0019】
また、本発明の雨水槽ユニットにおける骨格体は、梁体の裏面に複数の脚を備えた積重ね部材を縦横に並べると共に複数段積み重ねて組み立てたものであることが望ましく、このような多数の積重ね部材からなる骨格体は、組立て作業が簡単で、耐圧強度が大きく、貯水空隙率が高いという利点を有する。
【0020】
また、本発明の雨水槽ユニットにおいては、底板の周縁に、吊持用ロープなどの端部を引っ掛けるアイボルト又はフックを設けることが望ましく、このようにすると、アイボルト又はフックに吊持用ロープの端部を引っ掛けて、トラックへの積み降ろし作業や、地面の凹空部への設置作業を、簡単に行うことができる。
【0021】
【発明の実施の形態】
以下、図面を参照して、本発明の具体的な実施形態を詳述する。
【0022】
図1は本発明の一実施形態に係る雨水槽ユニットの一部破断斜視図、図2は同ユニットの概略横断面図、図3は図2の円で囲んだ部分の拡大図、図4は同ユニットの骨格体を構成する積重ね部材の斜視図、図5は同積重ね部材への板の取付け方を示す部分斜視図、図6は同積み重ね部材の相互の連結の仕方を示す部分斜視図、図7は同ユニットの代表的な施工態様を示す概略断面図、図8は同ユニットを吊り下げて地面の凹空部に設置するときの説明図である。
【0023】
この雨水槽ユニットは、図1,図2に示すように、底板1と、この底板1の上に多数の積重ね部材2を縦横に並べると共に複数段積み重ねて組み立てられた貯水空隙を有する骨格体と、この骨格体の上面及び四周側面に取付けられた板体3と、この骨格体の上面を覆う透水性上面シート4と、この骨格体の四周側面を覆う被覆シート5と、この被覆シート5の下端縁を底板1に固定するL形アングル材等の固定手段6とからなる。
【0024】
底板1は、例えばSMC(シートモールディングコンパウンド)や廃プラスチック再生原料などで成形された剛性が高い厚肉の方形板であって、積重ね部材2で組み立てられた骨格体の面積より少し大きい面積の底板1が使用されており、その四周縁が骨格体から外側へはみ出している。底板1の四周縁のはみ出し寸法は10〜50cm程度であることが好ましく、10cm未満では、土中に埋設したときの底板1による浮上防止効果が不充分になる恐れがあり、50cmを越えると、地面に掘削される凹空部8(図8参照)の余掘り量が多くなって工費が嵩むという不都合を生ずる。
【0025】
この底板1の相対向する長辺沿いには、アイボルト1aが二本ずつ取付けられている。このアイボルト1aは、図8に示すように吊持用ロープ7の端部を引っ掛けて雨水槽ユニットを持ち上げ、凹空部8への設置作業やトラックへの積み降ろし作業をし易くするものである。なお、このアイボルト1aに代えてフックを取付けてもよい。
【0026】
底板1の上に設置された骨格体を構成する積重ね部材2は、図4に示すようにポリプロピレン等の合成樹脂で射出成形された正方形の梁体2aと円筒形の脚2bからなるもので、梁体2aには、脚2bを上下から嵌合できる複数(図4では9つ)の嵌合穴2cが均等に分散、配列して形成されており、これらの嵌合穴2cには脚2bの上端部が下方から嵌着されている。そして、この梁体2aには、軽量化と材料の節約を図るために、複数(図4では12)の大きい貫通穴2dが形成されており、また、梁体2aの四辺には、後述するH形の連結駒の片側部分を挿入できる駒受部2eが2箇所ずつ形成されている。更に、この梁体2aの四隅の近くには、後述するように板体3を取付けるための凹部2f,2gが4箇所ずつ形成されている。
【0027】
上記の積重ね部材2は、底板1の上で縦横(前後左右)に並べられ、図6に示すように、互いに隣接する積重ね部材2,2のH形に合体された駒受部2e,2eにH形の連結駒2hを上方から挿入することによって、分離しないように且つ位置ズレしないように連結される。そして、この一段目の積重ね部材2の上に二段目の積重ね部材2を積み重ねて、その脚2bの下端部を一段目の積重ね部材2の梁体2aの嵌合穴2cに嵌合すると共に、縦横に隣接する積重ね部材2の梁体2a同士を上記の連結駒2hで連結し、同じ要領で積重ね部材2を数段(図1、図2では4段)積み重ねることによって、直方体形状の骨格体が組み立てられている。この骨格体は、各積重ね部材2の脚2bと脚2bとの間が貯水空隙となっており、貯水空隙率が高いために大量の雨水を溜めることが可能である。
【0028】
なお、骨格体は積重ね部材2を組み立てたものに限らず、例えば、貯水空隙を備えた耐圧強度の大きい単一の三次元立体網目構造の骨格体等を底板1の上に設置してもよい。
【0029】
積重ね部材2で組み立てた骨格体の上面と四周側面に取付けられる板体3は、上方からの土圧(荷重)や周囲からの土圧を受け止める役割を果たすものであって、積重ね部材2と同様のポリプロピレン等の合成樹脂で射出成形されている。この板体2には、図5に示すように多数の通水孔3aが形成されており、また、板体3の四隅の近くにはL形の突片3bと切欠凹部3cが形成されている。そして、骨格体の上面に重ねた板体3の上記突片3bを積重ね部材2の凹部2gに嵌込むと共に、積重ね部材2の集合体の側面に重ねた板体3の上記突片3bを、上面の板体3の切欠凹部3cを通して積重ね部材2の凹部2fに係止させることによって、位置ズレしないように板体3が骨格体の上面と四周側面に取付けられている。
【0030】
積重ね部材2で組み立てられた骨格体の上面を覆う透水性上面シート4は、該骨格体への土砂の侵入を阻止して雨水のみを浸透、導入する役割を果たすものであり、耐蝕性の良好な合成樹脂の織布や不織布が使用される。
【0031】
一方、積重ね部材2で組み立てられた骨格体の四周側面を覆う被覆シート5は、雨水槽ユニットが雨水貯溜用であるか雨水浸透用であるかによって、遮水性のシートと透水性のシートが使い分けられる。この実施形態の雨水槽ユニットは雨水貯溜用のユニットであるので、被覆シート5として合成樹脂シートやゴムシートなどの遮水性のシートを用いて骨格体の四周側面を被覆し、この遮水性の被覆シート5の内側に雨水を貯溜できるようにしている。
【0032】
遮水性の被覆シート5は、可撓性を有する柔軟なシートでもよいが、図2に示すように、シート上端縁5aを内側へ直角に折曲すると共に、シート下端縁5bを外側へ直角に折曲した形状を有する、剛性のある合成樹脂の成形シートが好ましく使用される。このような成形シートを使用すると、被覆作業が容易になり、固定手段6によるシート下端縁5bの固定作業もし易くなるという利点がある。この被覆シート5の上端縁5aは、溶着や接着の手段によって透水性上面シート4の端縁と接合されている。
【0033】
被覆シート5の下端縁5bを固定する固定手段6は、図3に示すように、L形のアングル材6aと、ボルト6b及びナット6cと、止水材6dからなるものであって、図示のように、シート下端縁5bを押さえるL形のアングル材6aとシート下端縁5bとの間、及び、シート下端縁5bと底板1との間に、止水材6d,6dをそれぞれ挟み込み、底板1の下方からボルト6bをアングル材6aの上面まで挿通してナット6cで締め付けることにより、シート下端縁5bを水密的に底板1に固定している。
【0034】
なお、雨水浸透用の雨水槽ユニットとする場合は、被覆シート5として前述の透水性上面シート4と同様の透水性のシートを使用して骨格体の四周側面を被覆し、止水材6dを省略してシート下端縁をアングル材6aとボルト6b及びナット6cで底板1に固定すればよい。
【0035】
次に、図7,図8を参照して、上述した雨水貯溜用の雨水槽ユニットの代表的な施工態様と、施工要領を説明する。
【0036】
まず、図8に示すように、吊持用ロープ7の端部のフックを底板1のアイボルト1aに引っ掛けて雨水槽ユニットを吊り上げ、地面に掘った凹空部8の底の砕石層8aの上に設置する。このように砕石層8aの上に不陸調節用の砂層を設けないで雨水槽ユニットを直接設置しても、雨水層ユニットの底板1が砕石層8aの多少の不陸を吸収するので、設置安定性が損なわれる心配はない。また、このように雨水槽ユニットを設置すると、従来のように凹空部8の内部で積重ね部材2を組み立てる作業や、被覆シート5等で該積重ね部材を覆う作業が一切不要となるので、設置作業を極めて簡単且つ短時間で行うことが可能となり、しかも、底板1より少し大きい開口面積の凹空部8を掘削すればよいので、従来に比べて余掘り量を少なくすることが可能となる。
【0037】
雨水槽ユニットの設置が終わると、吊持用ロープ7を除去し、図7に示すように、骨格体の一側面の上部から板体3と被覆シート5を貫通して外方へ突き出す流入口9を設けると共に、該骨格体の他の側面の下部から板体3と被覆シート5を貫通して外方へ突き出す取水口10を設ける。そして、雨水槽ユニットの片側に設置された泥溜桝11に上記の流入口9を直接又は導入短管を介して接続すると共に、雨水槽ユニットの反対側に設置された取水用の溜桝12に上記の取水口10を直接又は取水短管を介して接続し、泥溜桝11に雨水導入管13を接続する。また、取水用の溜桝12の底には取水ポンプ14を設置し、この取水ポンプ14に接続された取水管15を地上に引き出すと共に、溜桝12の上部にオーバーフロー管16を接続する。そして、骨格体の上面から板体3と透水性上面シート4を貫通して上方へ突き出す点検口17を設け、土砂が入らないように該点検口17に蓋を被せて、土砂を凹空部8に埋め戻すと、雨水槽ユニットの埋設施工が完了する。
【0038】
尚、流入口9、取水口10、点検口17は、予め、積重ね部材2で組み立てられた骨格体から外方へ突設しておくことが好ましく、そのようにすると、埋設施工現場でこれらを設ける作業が不要となるので、施工性が一層向上する利点がある。
【0039】
上記のように雨水槽ユニットを埋設施工すると、骨格体上面の板体3によって上方からの土圧や荷重が受け止められると共に、四周側面の板体3によって周囲からの土圧が受け止められるため、透水性上面シート4や被覆シート5を破って土砂が槽内へ侵入するのを阻止することができる。
【0040】
そして、地面に降った雨水は透水性上面シート4と上面の板体3の通水孔3aを通って槽内へ入り、屋根などに降った雨水は雨水導入管13から泥溜桝11に流れ込んで泥が除去された後、流入口9から槽内へ流入する。このように流入した雨水は、遮水シート5によって槽外への浸透が阻止され、骨格体を構成する積重ね部材2の脚2bと脚2bとの間の貯水空隙に貯溜されると共に、溜桝12の内部にも貯溜される。従って、取水ポンプ14を作動させると、貯溜された雨水が取水管15を通って地上に送水されるので、洗車等に有効利用することができる。また、大量の雨水が一度に槽内に流入した場合は、オーバーフロー管16から排水される。
【0041】
更に、槽内の点検は、点検口17から槽内を直接目視したり、点検用カメラを挿入して簡単に行うことができ、また、底板1の四周縁が周囲の土に食い込んで浮上防止板の役割を果たすため、地下水の浮力等を受けても浮上する心配はない。
【0042】
図9は、本発明の他の実施形態に係る雨水槽ユニットの施工態様を示す概略断面図である。
【0043】
この雨水槽ユニットは、前記の雨水槽ユニットのように泥溜桝11を槽外に設置しないで、槽内に泥溜桝11を設けた点が異なっている。即ち、骨格体を構成する積重ね部材2のうち、縦一列に積み重ねられた複数(図9では3つ)の積重ね部材2を取り出し、その取り出した部分に通水孔11aが形成された泥溜桝11を挿入すると共に、該泥溜桝11の上端開口を地面に露出させて蓋を被着し、雨水導水管13を該泥溜桝11に接続している。従って、この雨水槽ユニットでは、雨水導水管13から泥溜桝11に流入した雨水に含まれる土砂が泥溜桝11の底に沈降分離され、土砂を含まない澄んだ雨水が通水孔11aから槽内へ流出して貯溜される。
【0044】
この雨水槽ユニットの他の構成は前記の雨水槽ユニットと同様であるので、図9において同一部材に同一符号を付し、説明を省略する。
【0045】
上記のような雨水槽ユニットは、泥溜桝11を槽内に設けた分だけ施工面積を縮小することができるので、宅地があまり大きくない場合に有利である。
【0046】
図10は、本発明の更に他の実施形態に係る雨水槽ユニットの概略横断面図、図11は図10の円で囲んだ部分の拡大図である。
【0047】
この雨水槽ユニットは、積重ね部材2で組み立てられた骨格体の四周側面と底面を遮水性の被覆シート5で被覆すると共に、この被覆シート5の底部と側部下端を固定手段6で底板1に固定した点で、前記の雨水槽ユニットと異なっている。被覆シート5は柔軟なシートでもよいが、上面が開口する直方体形状に成形された剛性のある合成樹脂の成形シートを用いることが好ましく、このような成形シートを用いると、その内部に積重ね部材2を縦横に並べて複数段積み重ねることにより、骨格体の組立作業と、成形シートによる該骨格体の被覆作業を同時に行える利点がある。
【0048】
被覆シート5の側部下端を固定する固定手段6は、図11に示すように、L形のアングル材6aと、ボルト6b及びナット6cと、L形の合成樹脂製の帯体6eからなるものであって、図示のように、L形の帯体6eを被覆シート5の側部下端に溶着等の手段で固着すると共に、該帯体6eをL形のアングル材6aで押え、ボルト6bを底板1の下方からアングル材6aの上面まで挿通してナット6cで締め付けることにより底板1に固定している。
【0049】
また、被覆シート5の底部を固定する固定手段6は、図10に示すように、帯状の押え板6fと、ボルト6b及びナット6cと、止水材(不図示)とからなるものであって、被覆シート5の底部と押え板6fとの間に止水材を挟み込み、ボルト6bを底板1の下方から押え板6fの上面まで挿通してナット6cで締め付けることにより底板1に水密的に固定している。
【0050】
この雨水槽ユニットの他の構成は、前記の雨水槽ユニットと同様であるので、図10,図11において同一部材に同一符号を付し、説明を省略する。
【0051】
上記のように被覆シート5の底部と側部下端を固定手段6で固定した雨水槽ユニットは、被覆シート5と底板1の固定強度が大きいため、地中水による大きい浮力を受けた場合でも、被覆シート5が骨格体と共に底板1から分離して浮上する心配はない。
【0052】
以上、雨水貯溜用の雨水槽ユニットの代表的な実施形態を挙げて本発明を説明したが、雨水浸透用の雨水槽ユニットとする場合は、取水口11、溜桝12、取水ポンプ14、取水管15等が不要であることは言うまでもない。
【0053】
【発明の効果】
以上の説明から明らかなように、本発明の雨水槽ユニットは、施工現場で積重ね部材を積み重ねて骨格体を組み立てたり被覆シート等で被覆する作業が一切不要となり、余掘り量を少なくできる上に、不陸調整用の砂層も省略できるため、埋設施工性が大幅に向上し、工期の短縮や工費の節減を図ることができるといった効果を奏する。そして、ユニットごと運搬、荷降ろし、移動、設置等ができるので、取扱い性、運搬性、作業性等が大幅に向上し、また、底板によって浮上を防止できるといった効果も奏する。
【図面の簡単な説明】
【図1】本発明の一実施形態に係る雨水槽ユニットの一部破断斜視図である。
【図2】同ユニットの概略横断面図である。
【図3】図2の円で囲んだ部分の拡大図である。
【図4】同ユニットの骨格体を構成する積重ね部材の斜視図である。
【図5】同積重ね部材への板の取付け方を示す部分斜視図である。
【図6】同積み重ね部材の相互の連結の仕方を示す部分斜視図である。
【図7】同ユニットの代表的な施工態様を示す概略断面図である。
【図8】同ユニットを吊り下げて地面の凹空部に設置するときの説明図である。
【図9】本発明の他の実施形態に係る雨水槽ユニットの施工態様を示す概略断面図である。
【図10】本発明の更に他の実施形態に係る雨水槽ユニットの概略横断面図である。
【図11】図10の円で囲んだ部分の拡大図である。
【図12】雨水槽の従来例を示す概略断面図であって、埋設前の状態を示すものである。
【図13】雨水槽の従来例を示す概略断面図であって、埋設後の状態を示すものである。
【符号の説明】
1 底板
1a アイボルト
2 積重ね部材
2a 梁体
2b 脚
3 板体
3a 通水孔
4 透水性上面シート
5 被覆シート
6 固定手段
7 吊持用ロープ
8 凹空部
9 流入口
10 取水口
17 点検口
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rainwater tank unit that is buried underground and has good workability.
[0002]
[Prior art]
In urbanized areas where there are few unpaved roads or open spaces, rainwater does not penetrate into the ground and flows into rivers through gutters, etc. Beyond its capacity, causing so-called urban floods. On the other hand, during the dry season, the water levels of dams and lakes have fallen, resulting in a shortage of water.
[0003]
In order to cope with such a situation, a rainwater tank for rainwater penetration is provided in the ground, and rainwater is introduced into the rainwater tank and then gradually penetrates into the ground, or a rainwater tank for storing rainwater is provided in the ground. Thus, attempts have been made to effectively use rainwater stored in the rainwater tank.
[0004]
12 and 13 are schematic cross-sectional views showing a conventional example of a rainwater tank for rainwater infiltration or rainwater storage developed by the present applicant. FIG. 12 shows a state before embedding, and FIG. 13 shows a state after embedding. The state is shown.
[0005]
As shown in FIG. 12, this rainwater tank is provided with a crushed stone layer 101 and a sand layer 102 at the bottom of a large concave portion 100 formed by excavating the ground to eliminate unevenness, and is laid inside the concave portion 100. A large number of stacking members 104 are stacked vertically and horizontally on the covered sheet 103, and a plurality of stacking members 104 are stacked, and the bottom surface and four peripheral side surfaces of the aggregate of the stacking members 104 are covered with the coating sheet 103 as shown in FIG. The upper surface of the assembly 104 is covered with a water-permeable sheet 105, and a rainwater inflow pipe (not shown) or a water intake pipe (not shown) is connected to fill the recessed space 100 with soil, thereby forming the sheets 103 and 105. An assembly of the stacking members 104 covered by the above is embedded in the ground. As the stacking member 104, a synthetic resin stacking member having a plurality of legs attached to the back surface of the beam body is used. When such stacking members are stacked vertically and horizontally and stacked in a plurality of stages, the pressure resistance is large and the water storage porosity is high. An assembly of stacking members can be assembled.
[0006]
If the covering sheet 103 is a water-permeable sheet, the above-mentioned rainwater tank becomes a rainwater tank for rainwater permeation, and the rainwater introduced into the tank gradually penetrates and drains into the surrounding ground through the water-permeable covering sheet. be able to. On the other hand, if the covering sheet 103 is a water-blocking sheet, it becomes a rainwater tank for storing rainwater, and rainwater can be stored inside the water-blocking covering sheet.
[0007]
[Problems to be solved by the invention]
However, the above-mentioned rainwater tank requires time and effort to assemble the assembly by stacking the stacking members 104 in a plurality of stages while arranging them vertically and horizontally at the construction site, and covering the assembly of the stacking members 104 with the covering sheet 103 and the water-permeable sheet 105. It is difficult to say that the workability is good due to the fact that it is troublesome to weld the seam of the sheet, and there is a problem that it takes a considerable number of construction days.
[0008]
Further, when assembling the assembly of the stacking members 104 at the construction site and covering with a sheet as in the above-mentioned rainwater tank, it is necessary to increase the amount of extra digging around the assembly of the stacking members 104 in operation. Therefore, it is necessary to excavate the hollow space 100 which is considerably larger than the aggregate of the stacking members 104, and there is also a problem that the cost required for the hollow space 100 increases.
[0009]
Furthermore, if there is unevenness in the bottom surface of the concave portion 100, the stacking members 14 cannot be stacked in an orderly manner. Therefore, it is necessary to provide the sand layer 102 on the crushed stone layer 101 to eliminate the unevenness, and the cost required for it increases. There was a problem.
[0010]
In addition, when the above-mentioned rainwater tank is buried in a place with a large amount of groundwater, there is a problem that when the amount of rainwater in the tank is small, the rainwater tank rises due to the buoyancy of the groundwater.
[0011]
The present invention has been made in order to address the above problems, and the object thereof is to have extremely good workability and handleability, to shorten the construction period and to reduce the construction cost, and to prevent floating. It is an object of the present invention to provide a rainwater tank unit that can be used.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a rainwater tank unit of the present invention is a unit buried in the ground, and has a bottom plate, a skeleton having a storage space installed on the bottom plate, and an upper surface of the skeleton. , A covering sheet covering at least four side surfaces of the skeleton, and fixing means for fixing the covering sheet to the bottom plate.
[0013]
In this rainwater tank unit, a skeleton having a water storage space is installed on the bottom plate and covered with a water-permeable top sheet and a covering sheet. No work of covering with a covering sheet or the like is required at all, and the amount of surplus digging can be reduced. For this reason, it is extremely easy to bury the ground simply by digging a concave portion having an opening area slightly larger than the bottom plate on the ground, installing the rainwater tank unit, and backfilling the soil. Then, even if there is some unevenness on the bottom surface of the concave portion, the unevenness can be absorbed by the bottom plate, so that the conventional sand layer for adjusting unevenness can be omitted. As described above, the rainwater tank unit of the present invention has extremely good workability, so that the construction period can be shortened and the construction cost can be reduced.Moreover, the unit can be transported, unloaded, moved, installed, etc. Workability is also good. Furthermore, the rainwater tank unit of the present invention, when buried in the ground, has a four-sided edge of the bottom plate that cuts into the surrounding soil and serves as a floating prevention plate, so that there is no fear of floating even if it receives the buoyancy of groundwater. .
[0014]
In the rainwater tank unit of the present invention, it is desirable to attach a plate having water holes on the upper surface and the four circumferential side surfaces of the skeleton. In this way, the earth plate and the load from above are received by the plate member on the upper surface of the skeleton, and the earth pressure from the surroundings is received by the plate members on the four peripheral side surfaces. It is possible to prevent earth and sand from entering the tank.
[0015]
The rainwater tank unit of the present invention can be a rainwater storage unit or a rainwater infiltration unit depending on whether the covering sheet is water-blocking or water-permeable. That is, while covering the four circumferential side surfaces of the skeleton with a water-shielding sheet as a covering sheet, and fixing the lower edge of the sheet to the bottom plate in a watertight manner by the fixing means, a rainwater tank unit for storing rainwater can be obtained. Thus, rainwater can be stored in the space in the tank surrounded by the water-shielding covering sheet and the bottom plate. Also, when a water-blocking sheet is used as a covering sheet to cover the four peripheral sides and the bottom surface of the skeleton, it also becomes a rainwater tank unit for storing rainwater, and is surrounded by a water-blocking covering sheet covering the four peripheral sides and the bottom surface. Rainwater can be stored in the space inside the tank. On the other hand, if a water-permeable sheet is used as the covering sheet, it becomes a rainwater tank unit for rainwater permeation, and the rainwater introduced into the tank can permeate and drain into the surrounding soil through the water-permeable covering sheet. .
[0016]
In the rainwater tank unit for rainwater storage described above, it is desirable to provide an inflow port that protrudes outward from an upper portion of one side surface of the skeleton and an intake port that protrudes outward from a lower portion of the other side surface. By doing so, the rainwater tank unit can be easily connected to the rainwater tank unit after the rainwater tank unit is installed in the hollow part dug in the ground, so that the workability is further improved.
[0017]
Further, in the rainwater tank unit for rainwater infiltration, it is desirable to provide an inflow port that protrudes outward from an upper portion of one side surface of the skeleton, and in this case, the rainwater tank unit is placed in a concave portion dug in the ground. Since the rainwater inflow pipe can be easily connected after installation, workability is further improved.
[0018]
Further, in the rainwater tank unit of the present invention, it is desirable to provide an inspection port protruding upward from the upper surface of the skeleton body. In this case, it is possible to visually check the inside of the tank from the inspection port or insert an inspection camera. Therefore, the inspection inside the tank can be easily performed.
[0019]
In addition, the skeleton body in the rainwater tank unit of the present invention is desirably a stacking member having a plurality of legs arranged on the back surface of the beam body arranged vertically and horizontally and stacked in a plurality of stages. The skeletal body made of the members has the advantages that the assembling work is simple, the pressure resistance is large, and the water porosity is high.
[0020]
Further, in the rainwater tank unit of the present invention, it is desirable to provide an eyebolt or a hook for hooking an end of a hanging rope or the like on the periphery of the bottom plate. In this case, the eyebolt or the hook is provided with an end of the hanging rope. It is possible to easily carry out the work of loading and unloading the truck, and the work of installing it on the concave part of the ground by hooking the part.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
FIG. 1 is a partially cutaway perspective view of a rainwater tank unit according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the unit, FIG. 3 is an enlarged view of a portion circled in FIG. 2, and FIG. FIG. 5 is a perspective view of a stacking member constituting a frame of the unit, FIG. 5 is a partial perspective view showing how to attach a plate to the stacking member, FIG. 6 is a partial perspective view showing how the stacking members are connected to each other, FIG. 7 is a schematic cross-sectional view showing a typical construction mode of the unit, and FIG. 8 is an explanatory diagram when the unit is suspended and installed in a concave space on the ground.
[0023]
As shown in FIGS. 1 and 2, the rainwater tank unit includes a bottom plate 1 and a skeleton body having a water storage space assembled by arranging a number of stacking members 2 on the bottom plate 1 vertically and horizontally and stacking a plurality of stages. A plate 3 attached to the top and four sides of the skeleton, a water-permeable top sheet 4 covering the top of the skeleton, a covering sheet 5 covering the four sides of the skeleton, And fixing means 6 such as an L-shaped angle material for fixing the lower edge to the bottom plate 1.
[0024]
The bottom plate 1 is, for example, a thick rigid rectangular plate formed of a sheet molding compound (SMC) or a waste plastic recycled material, and has an area slightly larger than the area of the skeleton body assembled by the stacking members 2. No. 1 is used, and its four edges protrude outward from the skeleton. The protruding dimension of the four peripheral edges of the bottom plate 1 is preferably about 10 to 50 cm, and if it is less than 10 cm, the floating prevention effect of the bottom plate 1 when buried in the soil may be insufficient. There is a disadvantage that the recessed portion 8 (see FIG. 8) excavated on the ground has a large amount of extra digging and the construction cost increases.
[0025]
Two eyebolts 1a are mounted along long sides of the bottom plate 1 facing each other. As shown in FIG. 8, the eyebolt 1a hooks the end of the hanging rope 7 to lift the rainwater tank unit, thereby facilitating the installation work in the recess 8 and the loading / unloading work on the truck. . Note that a hook may be attached instead of the eyebolt 1a.
[0026]
As shown in FIG. 4, the stacking member 2 constituting the skeleton body installed on the bottom plate 1 is composed of a square beam 2a and a cylindrical leg 2b injection-molded with a synthetic resin such as polypropylene. A plurality of (9 in FIG. 4) fitting holes 2c, into which the legs 2b can be fitted from above and below, are formed in the beam 2a so as to be evenly distributed and arranged. Is fitted from below. A plurality of (12 in FIG. 4) large through-holes 2d are formed in the beam 2a in order to reduce the weight and save material, and the four sides of the beam 2a are described later. Two piece receiving portions 2e into which one side portion of the H-shaped connecting piece can be inserted are formed. Further, near the four corners of the beam 2a, there are formed four recesses 2f and 2g for mounting the plate 3 as described later.
[0027]
The stacking members 2 are arranged vertically and horizontally (front, rear, left and right) on the bottom plate 1 and, as shown in FIG. By inserting the H-shaped connecting piece 2h from above, it is connected so that it does not separate and does not shift. Then, the second-stage stacking member 2 is stacked on the first-stage stacking member 2, and the lower ends of the legs 2b are fitted into the fitting holes 2c of the beam 2a of the first-stage stacking member 2. By connecting the beam members 2a of the vertically adjacent stacking members 2 with the connecting pieces 2h and stacking the stacking members 2 in the same manner in several stages (four stages in FIGS. 1 and 2), a rectangular parallelepiped skeleton is formed. The body is assembled. In this skeleton, the space between the legs 2b of each stacking member 2 is a water storage space, and the storage water porosity is high, so that a large amount of rainwater can be stored.
[0028]
The skeletal body is not limited to the one in which the stacking members 2 are assembled. For example, a skeletal body of a single three-dimensional three-dimensional network structure having a water pressure gap and high pressure resistance may be installed on the bottom plate 1. .
[0029]
The plate members 3 attached to the upper surface and the four peripheral side surfaces of the skeleton body assembled by the stacking members 2 serve to receive earth pressure (load) from above and earth pressure from the surroundings. Injection molded with a synthetic resin such as polypropylene. As shown in FIG. 5, a large number of water holes 3a are formed in the plate 2, and L-shaped projections 3b and cutout recesses 3c are formed near four corners of the plate 3. I have. Then, the protrusion 3b of the plate 3 stacked on the upper surface of the skeleton body is fitted into the recess 2g of the stacking member 2 and the protrusion 3b of the plate 3 stacked on the side surface of the assembly of the stacking member 2 is The plate 3 is attached to the upper surface and the four circumferential side surfaces of the frame body so as not to be displaced by engaging with the concave portion 2f of the stacking member 2 through the cutout concave portion 3c of the plate 3 on the upper surface.
[0030]
The water permeable upper surface sheet 4 covering the upper surface of the skeleton body assembled by the stacking members 2 serves to prevent intrusion of earth and sand into the skeleton body and to permeate and introduce only rainwater, and has good corrosion resistance. A woven or non-woven fabric of a synthetic resin is used.
[0031]
On the other hand, the covering sheet 5 that covers the four circumferential side surfaces of the skeleton body assembled by the stacking member 2 can be selectively used as a water-blocking sheet and a water-permeable sheet depending on whether the rainwater tank unit is for storing rainwater or for penetrating rainwater. Can be Since the rainwater tank unit of this embodiment is a unit for storing rainwater, the water-shielding sheet such as a synthetic resin sheet or a rubber sheet is used as the cover sheet 5 to cover the four circumferential side surfaces of the skeleton body. Rainwater can be stored inside the seat 5.
[0032]
The waterproof sheet 5 may be a flexible sheet having flexibility. As shown in FIG. 2, the sheet upper edge 5a is bent inward at a right angle, and the sheet lower edge 5b is bent at an outer right angle. A molded sheet of a rigid synthetic resin having a bent shape is preferably used. The use of such a molded sheet has an advantage that the covering operation is facilitated and the fixing operation of the lower end edge 5b of the sheet by the fixing means 6 is also facilitated. The top edge 5a of the cover sheet 5 is joined to the edge of the water-permeable top sheet 4 by welding or bonding.
[0033]
As shown in FIG. 3, the fixing means 6 for fixing the lower edge 5b of the covering sheet 5 is composed of an L-shaped angle member 6a, bolts 6b and nuts 6c, and a waterproof material 6d. As described above, between the L-shaped angle member 6a for holding down the sheet lower edge 5b and the sheet lower edge 5b, and between the sheet lower edge 5b and the bottom plate 1, the waterproof materials 6d, 6d are sandwiched, respectively. The lower end edge 5b of the seat is fixed to the bottom plate 1 in a watertight manner by inserting a bolt 6b from below to the upper surface of the angle member 6a and tightening it with a nut 6c.
[0034]
When a rainwater tank unit for infiltrating rainwater is used, a water-permeable sheet similar to the above-described water-permeable top sheet 4 is used as the covering sheet 5 to cover the four circumferential side surfaces of the skeleton, and the water-stopping material 6d is formed. The lower end of the seat may be fixed to the bottom plate 1 with the angle member 6a, the bolt 6b, and the nut 6c.
[0035]
Next, with reference to FIG. 7 and FIG. 8, a typical construction mode of the above-described rainwater tank unit for rainwater storage and a construction procedure will be described.
[0036]
First, as shown in FIG. 8, a hook at the end of the hanging rope 7 is hooked on the eyebolt 1a of the bottom plate 1 to lift the rainwater tank unit, and the crushed stone layer 8a at the bottom of the hollow space 8 dug into the ground. Installed in Even if the rainwater tank unit is directly installed without providing a sand layer for controlling unevenness on the crushed stone layer 8a, the bottom plate 1 of the rainwater layer unit absorbs some unevenness of the crushed stone layer 8a. There is no worry that stability will be compromised. Further, when the rainwater tank unit is installed in this manner, the work of assembling the stacking member 2 inside the concave space 8 and the operation of covering the stacking member with the covering sheet 5 and the like as in the related art become unnecessary at all. The work can be performed extremely easily and in a short time, and since the recessed portion 8 having an opening area slightly larger than the bottom plate 1 may be excavated, the excess excavation amount can be reduced as compared with the related art. .
[0037]
When the installation of the rainwater tank unit is completed, the hanging rope 7 is removed, and as shown in FIG. 7, an inflow port that protrudes outward through the plate 3 and the covering sheet 5 from the upper part of one side of the skeleton. 9 and a water intake port 10 protruding outward through the plate 3 and the covering sheet 5 from the lower part of the other side surface of the skeleton. The inflow port 9 is connected to the mud basin 11 installed on one side of the rainwater tank unit, either directly or via a short introduction pipe, and the intake basin 12 installed on the opposite side of the rainwater tank unit. The above-mentioned water inlet 10 is connected directly or via a short water intake pipe, and a rainwater introduction pipe 13 is connected to the mud pit 11. An intake pump 14 is installed at the bottom of the intake basin 12, an intake pipe 15 connected to the intake pump 14 is pulled out to the ground, and an overflow pipe 16 is connected to an upper portion of the intake basin 12. Then, an inspection port 17 is provided to penetrate the plate body 3 and the water-permeable upper surface sheet 4 from the upper surface of the skeleton body and protrude upward. When it is backfilled to 8, the burial construction of the rainwater tank unit is completed.
[0038]
In addition, it is preferable that the inflow port 9, the water intake port 10, and the inspection port 17 protrude outward from the skeleton body assembled by the stacking member 2 in advance. Since there is no need to provide the work, there is an advantage that the workability is further improved.
[0039]
When the rainwater tank unit is buried and constructed as described above, earth pressure and load from above are received by the plate 3 on the upper surface of the skeleton, and earth pressure from the surroundings is received by the plate 3 on the four circumferential side surfaces. The soil and sand can be prevented from breaking into the tank by breaking the top sheet 4 and the covering sheet 5.
[0040]
Then, the rainwater falling on the ground enters the tank through the water-permeable upper sheet 4 and the water holes 3a of the plate body 3 on the upper surface, and the rainwater falling on the roof or the like flows from the rainwater introduction pipe 13 into the mud reservoir 11. After the mud is removed by the above, the water flows into the tank from the inflow port 9. The rainwater that has flowed in this way is prevented from penetrating outside the tank by the water-blocking sheet 5, and is stored in the water-storage gap between the legs 2b of the stacking member 2 that constitutes the skeleton, and the storage tank 12 are also stored. Therefore, when the water intake pump 14 is operated, the stored rainwater is sent to the ground through the water intake pipe 15, so that it can be effectively used for car washing and the like. When a large amount of rainwater flows into the tank at one time, it is drained from the overflow pipe 16.
[0041]
Furthermore, the inspection inside the tank can be easily performed by directly observing the inside of the tank from the inspection opening 17 or by inserting an inspection camera, and the four peripheral edges of the bottom plate 1 bite into the surrounding soil to prevent floating. Because it plays the role of a board, there is no need to worry about floating even if it receives the buoyancy of groundwater.
[0042]
FIG. 9 is a schematic sectional view showing a construction mode of a rainwater tank unit according to another embodiment of the present invention.
[0043]
This rainwater tank unit is different from the above-mentioned rainwater tank unit in that the mud pit 11 is not provided outside the tank, but the mud pit 11 is provided in the tank. That is, a plurality (three in FIG. 9) of the stacking members 2 stacked in a vertical line are taken out of the stacking members 2 constituting the skeleton body, and a mud basin having a water passage hole 11a formed in the taken-out portion. 11 is inserted, the upper end opening of the mud basin 11 is exposed to the ground, and a lid is attached. The rainwater conduit 13 is connected to the mud basin 11. Therefore, in this rainwater tank unit, the sediment contained in the rainwater flowing into the mud basin 11 from the storm water conduit 13 is settled and separated at the bottom of the mud basin 11, and clear rainwater containing no sediment flows from the water hole 11a. It flows out into the tank and is stored.
[0044]
Since other configurations of the rainwater tank unit are the same as those of the above-described rainwater tank unit, the same members in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.
[0045]
The rainwater tank unit as described above can reduce the construction area by the amount of the mud pit 11 provided in the tank, which is advantageous when the residential land is not so large.
[0046]
FIG. 10 is a schematic cross-sectional view of a rainwater tank unit according to still another embodiment of the present invention, and FIG. 11 is an enlarged view of a portion surrounded by a circle in FIG.
[0047]
The rainwater tank unit covers the four peripheral side surfaces and the bottom surface of the skeleton body assembled with the stacking member 2 with the water-shielding covering sheet 5, and fixes the bottom portion and the side lower end of the covering sheet 5 to the bottom plate 1 by fixing means 6. It differs from the above-mentioned rainwater tank unit in that it is fixed. Although the covering sheet 5 may be a flexible sheet, it is preferable to use a rigid synthetic resin molded sheet molded into a rectangular parallelepiped shape having an open upper surface. Are arranged vertically and horizontally and stacked in a plurality of stages, whereby there is an advantage that the operation of assembling the skeleton and the operation of covering the skeleton with a molded sheet can be performed simultaneously.
[0048]
As shown in FIG. 11, the fixing means 6 for fixing the side lower end of the covering sheet 5 includes an L-shaped angle member 6a, bolts 6b and nuts 6c, and an L-shaped synthetic resin band 6e. As shown in the figure, the L-shaped band 6e is fixed to the lower end of the side of the cover sheet 5 by welding or the like, and the band 6e is pressed by the L-shaped angle member 6a, and the bolt 6b is fixed. It is fixed to the bottom plate 1 by being inserted from below the bottom plate 1 to the upper surface of the angle member 6a and tightened with a nut 6c.
[0049]
Further, as shown in FIG. 10, the fixing means 6 for fixing the bottom of the covering sheet 5 comprises a band-shaped pressing plate 6f, bolts 6b and nuts 6c, and a water-stopping material (not shown). A waterproof material is sandwiched between the bottom of the covering sheet 5 and the holding plate 6f, and the bolts 6b are inserted from below the bottom plate 1 to the upper surface of the holding plate 6f and fastened with the nuts 6c to be watertightly fixed to the bottom plate 1. are doing.
[0050]
Other configurations of the rainwater tank unit are the same as those of the above-described rainwater tank unit. Therefore, in FIGS. 10 and 11, the same members are denoted by the same reference numerals, and description thereof will be omitted.
[0051]
As described above, the rainwater tank unit in which the bottom and the lower end of the covering sheet 5 are fixed by the fixing means 6 has a large fixing strength between the covering sheet 5 and the bottom plate 1, and therefore, even when subjected to a large buoyancy due to groundwater. There is no need to worry that the covering sheet 5 floats separately from the bottom plate 1 together with the skeleton.
[0052]
As described above, the present invention has been described with reference to the typical embodiment of the rainwater tank unit for storing rainwater. However, when the rainwater tank unit for rainwater permeation is used, the water intake 11, the reservoir 12, the water intake pump 14, and the Needless to say, the water pipe 15 and the like are unnecessary.
[0053]
【The invention's effect】
As is clear from the above description, the rainwater tank unit of the present invention does not require any work for stacking the stacking members at the construction site and assembling the skeleton or covering with the covering sheet or the like, and the amount of excavation can be reduced. In addition, since the sand layer for uneven land adjustment can be omitted, the embedding workability is greatly improved, and there is an effect that the construction period can be shortened and the construction cost can be reduced. In addition, since the entire unit can be transported, unloaded, moved, installed, and the like, handling, transportability, workability, and the like are greatly improved, and the bottom plate prevents the floating.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a rainwater tank unit according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of the unit.
FIG. 3 is an enlarged view of a portion surrounded by a circle in FIG. 2;
FIG. 4 is a perspective view of a stacking member forming a skeleton body of the unit.
FIG. 5 is a partial perspective view showing how to attach a plate to the stacking member.
FIG. 6 is a partial perspective view showing how the stacking members are connected to each other.
FIG. 7 is a schematic sectional view showing a typical construction mode of the unit.
FIG. 8 is an explanatory diagram when the unit is suspended and installed in a concave space on the ground.
FIG. 9 is a schematic sectional view showing a construction mode of a rainwater tank unit according to another embodiment of the present invention.
FIG. 10 is a schematic cross-sectional view of a rainwater tank unit according to still another embodiment of the present invention.
FIG. 11 is an enlarged view of a portion surrounded by a circle in FIG. 10;
FIG. 12 is a schematic sectional view showing a conventional example of a rainwater tank, showing a state before embedding.
FIG. 13 is a schematic cross-sectional view showing a conventional example of a rainwater tank, showing a state after embedding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottom plate 1a Eye bolt 2 Stacking member 2a Beam 2b Leg 3 Plate 3a Water hole 4 Water permeable top sheet 5 Covering sheet 6 Fixing means 7 Suspension rope 8 Concave part 9 Inlet 10 Water intake 17 Inspection port

Claims (10)

地中に埋設される雨水槽ユニットであって、底板と、この底板の上に設置された貯水空隙を有する骨格体と、この骨格体の上面を覆う透水性上面シートと、この骨格体の少なくとも四周側面を覆う被覆シートと、この被覆シートを上記底板に固定する固定手段とからなることを特徴とする雨水槽ユニット。A rainwater tank unit buried in the ground, a bottom plate, a skeleton having a water storage space installed on the bottom plate, a water-permeable top sheet covering an upper surface of the skeleton, and at least the skeleton A rainwater tank unit comprising: a covering sheet covering four side surfaces; and fixing means for fixing the covering sheet to the bottom plate. 前記骨格体の上面と四周側面に、透水孔を有する板体が取付けられている請求項1に記載の雨水槽ユニット。The rainwater tank unit according to claim 1, wherein a plate having a water-permeable hole is attached to an upper surface and four circumferential side surfaces of the skeleton. 前記被覆シートが遮水性のシートであって、前記骨格体の四周側面が該シートで覆われており、該シートの下端縁が前記固定手段によって水密的に前記底板に固定されている、雨水貯溜用の請求項1又は請求項2に記載の雨水槽ユニット。A rainwater reservoir, wherein the covering sheet is a water-blocking sheet, four peripheral side surfaces of the skeleton are covered with the sheet, and a lower edge of the sheet is fixed to the bottom plate in a watertight manner by the fixing means. The rainwater tank unit according to claim 1 or 2 for use. 前記被覆シートが遮水性のシートであって、前記骨格体の四周側面と底面が該シートで覆われている、雨水貯溜用の請求項1又は請求項2に記載の雨水槽ユニット。3. The rainwater tank unit according to claim 1, wherein the covering sheet is a water-blocking sheet, and four side surfaces and a bottom surface of the skeleton are covered with the sheet. 4. 前記被覆シートが透水性のシートである、雨水浸透用の請求項1又は請求項2に記載の雨水槽ユニット。The rainwater tank unit according to claim 1 or 2, wherein the covering sheet is a water-permeable sheet for rainwater penetration. 前記骨格体の一側面の上部から外方へ突き出す流入口が設けられ、他の一側面の下部から外方へ突き出す取水口が設けられている、請求項3又は請求項4に記載の雨水槽ユニット。The rainwater tank according to claim 3 or 4, wherein an inflow port protruding outward from an upper portion of one side surface of the skeleton body is provided, and an intake port protruding outward from a lower portion of the other side surface is provided. unit. 前記骨格体の一側面の上部から外方へ突き出す流入口が設けられている、請求項5に記載の雨水槽ユニット。The rainwater tank unit according to claim 5, wherein an inflow port protruding outward from an upper portion of one side surface of the skeleton body is provided. 前記骨格体の上面から上方に突き出す点検口が設けられている、請求項1ないし請求項7のいずれかに記載の雨水槽ユニット。The rainwater tank unit according to claim 1, wherein an inspection port protruding upward from an upper surface of the skeleton body is provided. 前記骨格体が、梁体の裏面に複数の脚を備えた積重ね部材を縦横に並べると共に複数段積み重ねて組み立てられたものである、請求項1ないし請求項8のいずれかに記載の雨水槽ユニット。The rainwater tank unit according to any one of claims 1 to 8, wherein the skeleton body is formed by arranging a stacking member having a plurality of legs on a back surface of a beam member vertically and horizontally and stacking a plurality of stages. . 前記底板の周縁に、吊持用ロープなどの端部を引っ掛けるアイボルト又はフックが設けられている、請求項1ないし請求項9のいずれかに記載の雨水槽ユニット。The rainwater tank unit according to any one of claims 1 to 9, wherein an eyebolt or a hook for hooking an end of a hanging rope or the like is provided on a periphery of the bottom plate.
JP2002379396A 2002-12-27 2002-12-27 Rainwater tank unit Expired - Lifetime JP3991270B2 (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083556A (en) * 2004-09-14 2006-03-30 Sekisui Chem Co Ltd Rainwater outflow suppressing facility
WO2006038602A1 (en) * 2004-10-04 2006-04-13 Toyo Tire & Rubber Co., Ltd. Member for rainwater containing structure and rainwater containing structure body using the same
JP2006219910A (en) * 2005-02-10 2006-08-24 Sekisui Chem Co Ltd Rainwater outflow suppressing system
JP2006322149A (en) * 2005-05-17 2006-11-30 Mitsubishi Plastics Ind Ltd Underground storage permeation tank of rainwater
JP2007211585A (en) * 2006-02-08 2007-08-23 Brentwood Industries Inc Waste water tank or channel module
JP2008031645A (en) * 2006-07-26 2008-02-14 Bridgestone Corp Rainwater storage tank
JP2008280696A (en) * 2007-05-09 2008-11-20 Eng Kobo:Kk Underground water tank
JP2008291498A (en) * 2007-05-24 2008-12-04 Ooike Co Ltd Storage permeating system
JP2011006857A (en) * 2009-06-23 2011-01-13 Ooike Co Ltd Structure for temporarily storing drainage and infiltrating drainage to the underground
JP2011144579A (en) * 2010-01-15 2011-07-28 Ebata Kk Lid member, assembly, and underground water storage facility using the assembly
JP2011236692A (en) * 2010-05-13 2011-11-24 Watanabe Sato Co Ltd Rainwater storage facility
JP2012046916A (en) * 2010-08-25 2012-03-08 Sekisui Plastics Co Ltd Drainage structure of underpass part
JP2013096106A (en) * 2011-10-31 2013-05-20 Ebata Kk Construction method of underground structure
JP2013100720A (en) * 2013-02-26 2013-05-23 Aron Kasei Co Ltd Catch basin

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083556A (en) * 2004-09-14 2006-03-30 Sekisui Chem Co Ltd Rainwater outflow suppressing facility
WO2006038602A1 (en) * 2004-10-04 2006-04-13 Toyo Tire & Rubber Co., Ltd. Member for rainwater containing structure and rainwater containing structure body using the same
JP4504832B2 (en) * 2005-02-10 2010-07-14 積水化学工業株式会社 Rainwater runoff control system
JP2006219910A (en) * 2005-02-10 2006-08-24 Sekisui Chem Co Ltd Rainwater outflow suppressing system
JP2006322149A (en) * 2005-05-17 2006-11-30 Mitsubishi Plastics Ind Ltd Underground storage permeation tank of rainwater
JP4509853B2 (en) * 2005-05-17 2010-07-21 三菱樹脂株式会社 Rainwater underground storage and penetration tank
JP2007211585A (en) * 2006-02-08 2007-08-23 Brentwood Industries Inc Waste water tank or channel module
JP2008031645A (en) * 2006-07-26 2008-02-14 Bridgestone Corp Rainwater storage tank
JP4695037B2 (en) * 2006-07-26 2011-06-08 株式会社ブリヂストン Rainwater storage tank
JP2008280696A (en) * 2007-05-09 2008-11-20 Eng Kobo:Kk Underground water tank
JP2008291498A (en) * 2007-05-24 2008-12-04 Ooike Co Ltd Storage permeating system
JP2011006857A (en) * 2009-06-23 2011-01-13 Ooike Co Ltd Structure for temporarily storing drainage and infiltrating drainage to the underground
JP2011144579A (en) * 2010-01-15 2011-07-28 Ebata Kk Lid member, assembly, and underground water storage facility using the assembly
JP2011236692A (en) * 2010-05-13 2011-11-24 Watanabe Sato Co Ltd Rainwater storage facility
JP2012046916A (en) * 2010-08-25 2012-03-08 Sekisui Plastics Co Ltd Drainage structure of underpass part
JP2013096106A (en) * 2011-10-31 2013-05-20 Ebata Kk Construction method of underground structure
JP2013100720A (en) * 2013-02-26 2013-05-23 Aron Kasei Co Ltd Catch basin

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