JP4327310B2

JP4327310B2 - Groundwater tank filling structure

Info

Publication number: JP4327310B2
Application number: JP28002299A
Authority: JP
Inventors: 茂夫大森; 隆之池田; 伊佐男井上; 裕幸屋井
Original assignee: Meiji Rubber and Chemical Co Ltd; Tokyu Construction Co Ltd
Current assignee: Meiji Rubber and Chemical Co Ltd; Tokyu Construction Co Ltd
Priority date: 1999-09-30
Filing date: 1999-09-30
Publication date: 2009-09-09
Anticipated expiration: 2019-09-30
Also published as: JP2001098591A

Description

【０００１】
【発明の属する技術分野】
本発明は、地下に造られる貯溜型ないし浸透型の地下水槽の充填構造に関し、殊に、周囲からの土圧に対する強度を高めた地下水槽の充填構造に関する。
【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など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超えて、所謂、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るため、各地で水道水の給水制限が実施されている。
【０００３】
かかる事情から、浸透型の地下水槽を設けて、雨水を一時貯溜したのち地下へ徐々に浸透させたり、貯溜型の地下水槽を設けて、貯溜した雨水を有効利用することが試みられるようになってきた。
【０００４】
このような貯溜型の地下水槽としては、地面を掘削して地下に形成した水槽の底面及び側面に遮水シートを設け、その内側に合成樹脂製の充填体を縦横に並べると共に上下に積み重ねて充填し、その上に透水シートを重ねて土で覆った構造を有するものが知られている。また、透水型の地下水槽としては、その側面に沿って透水シートを設け、同様に充填体を水槽の内側に充填して、その上を透水シートと土で覆った構造を有するものが知られている。
【０００５】
これらの貯溜型及び浸透型の地下水槽においては、充填体として、数本の長い脚柱を枠体に設けたものが好ましく使用されており、積み重ねた充填体の外周には合成樹脂製の側板を取付けることが多い。
【０００６】
【発明が解決しようとする課題】
しかしながら、上記のように脚柱を備えた合成樹脂製の充填体を縦横に並べると共に上下に積み重ねて地下水槽内に充填し、その外周に合成樹脂製の側板を設けた充填構造は、側板によって周囲からの土圧に対する耐圧強度が幾分向上するとはいうものの、側板だけでは耐圧強度が充分でないため、周囲からの土圧によって側板が破壊され、土が地下水槽内に入って押し潰される心配があった。特に脚柱の長い充填体を積み重ねる場合は、側板を内側から支える充填体の枠体の上下間隔が広くなるため、側板が土圧によって破壊され易くなるという問題があった。
【０００７】
側板の強度を上げるには、側板の厚みを大きくしたり、側板に補強リブを形成すればよいが、このような方法で側板の強度を上げても限界があり、多量の樹脂を使用するためコストが高くなるばかりか、側板の重量が増して持ち運びし難くなり、施工性の低下を招くことになる。
【０００８】
また、上記の充填構造では、地震が発生すると側板が脱落し易いため、その脱落部分から土が地下水槽内へ入る心配もあった。
【０００９】
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、周囲からの土圧に対する耐圧強度が大きく、土圧によって側板が破壊されたり、地震によって側板が脱落したりする心配がない地下水槽の充填構造を提供することにある。
【００１０】
【課題を解決するための手段】
上記目的を達成するため、本発明の請求項１に係る地下水槽の充填構造は、地下水槽内に、数本の長い脚柱を枠体に設けた充填体を縦横に並べると共に上下に積み重ねて充填し、その外周に側板を設けた充填構造において、充填体の脚柱の間を通して上下方向よりも左右方向に撓み難い断面形状を有している突張り棒を相対向する側板間に架け渡したことを特徴とするものである。
【００１１】
この充填構造のように、相対向する側板間に突張り棒を架け渡すと、周囲から大きい土圧が側板に作用しても、側板が突張り棒で内側から支えられて土圧に充分耐えられるようになり、側板が破壊される心配は解消される。また、この充填構造のように、突張り棒が上下方向よりも左右方向に撓み難い断面形状を有するものであると、側板に土圧が作用したとき、突張り棒が上下方向に撓むことはあっても左右方向に撓むことはないため、突張り棒が充填体の脚柱に側方から当たって座屈させる恐れも生じない。
【００１２】
次に、本発明の請求項２に係る地下水槽の充填構造は、上記請求項１の充填構造において、その側板の内面に棒受部を形成し、突張り棒の端部を棒受部に嵌込んだことを特徴とするものである。
【００１３】
この充填構造のように、側板の内面の棒受部に突張り棒の端部を嵌込むと、突張り棒を側板間に架け渡した状態で簡単に支持することができ、棒受部から突張り棒が外れ落ちることもない。
【００１４】
次に、本発明の請求項３に係る地下水槽の充填構造は、地下水槽内に、数本の長い脚柱を枠体に設けた充填体を縦横に並べると共に上下に積み重ねて充填し、その外周に側板を設けた充填構造において、縦横に隣接する充填体の間に中間板を配設し、充填体の脚柱の間を通して上下方向よりも左右方向に撓み難い断面形状を有している突張り棒を中間板と該中間板に対向する側板又は中間板との間に架け渡したことを特徴とするものである。
【００１５】
この充填構造のように、中間板を配設して突張り棒を中間板と側板又は中間板との間に架け渡すと、相対向する側板の間隔に等しい長尺の突張り棒に代えて、中間板と側板又は中間板との間隔に等しい短尺の突張り棒を使用できるようになり、このような短尺の突張り棒は、側壁に土圧が作用したとき、長尺の突張り棒よりも撓み難いので、耐圧強度を充分に向上させることができる。また、この突張り棒は上下方向より左右方向に撓み難い断面形状を有しているので、側壁に土圧が作用したとき、突張り棒が充填体の脚柱に側方から当たって座屈させる恐れも生じない。
【００１６】
次に、本発明の請求項４に係る地下水槽の充填構造は、上記請求項３の充填構造において、その側板の内面に棒受部を形成すると共に、中間板の両面に棒受部を形成し、突張り棒の端部を棒受部に嵌込んだことを特徴とするものである。
【００１７】
このような充填構造も、中間板と側板との間に架け渡した突張り棒を脱落しないように簡単に支持することができる。
【００１８】
次に、本発明の請求項５に係る地下水槽の充填構造は、上記請求項２又は請求項４の充填構造において、その棒受部を上部が開放した形状となし、この開放した上部から突張り棒の端部を棒受部へ嵌込んだことを特徴とするものである。
【００１９】
このようにすると、突張り棒の棒受部への嵌込み作業が極めて簡単になり、しかも、突張り棒が棒受部から外れ落ちることもない。
【００２２】
次に、本発明の請求項６に係る地下水槽の充填構造は、上記請求項１の充填構造において、その突張り棒の端部を側板に固着したことを特徴とするものである。
【００２３】
このように突張り棒の端部が側板に固着されていると、地震が発生しても側板が脱落しないので、土が地下水槽内へ入るのを防止することができる。
【００２４】
次に、本発明の請求項７に係る地下水槽の充填構造は、上記請求項１の充填構造において、その側板の外側に押え棒を添設し、該押え棒を突張り棒の端部に固着したことを特徴とするものである。
【００２５】
このような充填構造では、地震が発生しても、押え棒が突張り棒の端部から分離することはなく、この押え棒によって側板が外側から押えられるので、側板の脱落を防止することができる。
【００２６】
次に、本発明の請求項８に係る地下水槽の充填構造は、上記請求項３の充填構造において、その中間板と側板との間に架け渡した突張り棒の両端部を、該中間板と該側板に固着したことを特徴とするものである。
【００２７】
この充填構造も、突張り棒の両端部が側板と中間板に固着されているので、地震の際に側板が脱落することはなく、地下水槽内に土が入るのを防止することができる。
【００２８】
次に、本発明の請求項９に係る地下水槽の充填構造は、上記請求項３の充填構造において、その側板の外側に押え棒を添設し、この押え棒を、中間板と側板との間に架け渡した突張り棒の端部に固着したことを特徴とするものである。
【００２９】
この充填構造も、地震の際に押え棒が突張り棒から分離することなく側板を押えるので、側板の脱落を防止することができる。
【００３０】
【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。
【００３１】
図１は本発明の一実施形態に係る地下水槽の充填構造を示す概略断面図、図２は同充填構造に用いる充填体と側板の斜視図、図３は同充填構造の拡大部分断面図、図４は充填体への側板と天板の取付け方を示す部分斜視図、図５は充填体の枠体相互の連結の仕方を示す部分斜視図である。
【００３２】
この図１の実施形態は貯溜型の地下水槽の充填構造を例示したもので、地面を掘削して形成した地下水槽１の底面及び側面には遮水シート２が添設され、地下水槽１の底には底板３が縦横に並べられて敷設されている。そして、この地下水槽１の内側には、脚柱４２を備えた充填体４が縦横に並べられると共に上下に積み重ねられて充填されており、その外周に側板５が取付けられている。また、最上段の充填体４の上には天板６と透水シート７が重ねられ、その上から土８が被せられており、更に、相対向する側板５，５の間には、耐圧強度を高める突張り棒９が充填体４の脚柱４２の間を通して掛け渡されている。
【００３３】
この充填体４は、図１，図２，図３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枠体４１と、図示のように長い円筒形の脚柱４２から成るもので、枠体４１の四隅部と中央部と四辺の中間部には、脚柱４２を上下から嵌合できる嵌合穴４１ａが合計９つ形成され、各嵌合穴４１ａに脚柱４２の上端部が下方から嵌合されて１ユニットの充填体４が構成されている。
【００３４】
この脚柱４２の上部と下部には節部４２ａが形成され、脚柱４２の上端部又は下端部を枠体４１の嵌合穴４１ａに下方又は上方から嵌合したとき、該節部４２ａが嵌合穴４１ａの周縁部に係止して、それ以上深く嵌合されないようになっている。
【００３５】
また、上記の枠体４１には、軽量化と材料の節約を図るために、数個の大きい貫通穴４１ｂが形成されている。そして、枠体４１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４１ｃが２箇所ずつ合計８箇所形成され、更に、後述する側板５や天板６の突片を係止させる凹部４１ｄ，４１ｅが四辺のコーナー近くに４箇所ずつ合計１６箇所形成されている。
【００３６】
一方、側板５は、上記充填体４と同様のポリプロピレン等の合成樹脂で射出成形されたものであり、図２に示すように、この側板５の片面側の中央部と四隅部と四辺の中間部には、上記脚柱４２の端部を嵌合できる嵌合穴５ａが合計９つ形成されている。そして、中央部の嵌合穴５ａと四隅部の嵌合穴５ａとの間に合計４つの棒受部５ｂが形成され、嵌合穴５ａと棒受部５ｂが補強リブ５ｃによって縦、横、斜め方向に連結されている。この嵌合穴５ａと棒受部５ｂは、いずれも側板５の片面から円環状に突設されたものであり、棒受部５ｂには突張り棒９の端部が嵌込まれるようになっている。
【００３７】
また、この側板５の四辺のコーナー近くには、Ｌ形の突片５ｄと切欠凹部５ｅが形成され、該突片５ｄによって側板５が充填体４に取付けられるようになっている。尚、図示はしていないが、この側板５には多数の小孔が穿孔され、軽量化が図られている。
【００３８】
底板３と天板６はいずれも、上記の側板５を共用したものである。即ち、図３に示すように、上記の側板５を底板３として使用し、嵌合穴５ａを形成した片面が上側となるように該底板３（側板５）を縦横に並べて地下水槽１の底面に敷設し、各底板３（側板５）の嵌合穴５ａに充填体４の脚柱４２の下端部を嵌合して一段目の充填体４を縦横に並べている。
【００３９】
そして、この一段目の充填体４の上に二段目の充填体４を積み重ねて、その脚柱４２の下端部を一段目の充填体４の枠体４１の嵌合穴４１ａに嵌合し、同じ要領で充填材４を数段積み重ねて、最上段の充填材４の上に、上記の側板５を天板６として被着している。この天板６（側板５）は、図３に示すように嵌合穴５ａが形成された片面を下側にして最上段の充填材４の枠体４１の上に重ねられ、図４に示すように天板６（側板５）の各突片５ｄが枠体４１の各凹部４１ｅに嵌込まれて、前後左右に位置ズレしないように取付けられている。
【００４０】
図４に示すように、側板５は、そのＬ形の突片５ｄを充填体４の枠体４１に形成された凹部４１ｄに係止させることにより、充填体４の外側に取付けられている。この側板５の一辺の長さは充填体４の枠体４１の一辺の長さと同一であり、枠体４１の一辺の長さは充填体４を二段に積み重ねた高さと同一になっているため、二段に積み重ねた充填体４に対して一枚の側板５が取付けられるようになっている。
【００４１】
尚、縦横に隣接する充填体４の枠体４１同士は、図５に示すように、Ｈ形の連結駒１０を、Ｈ形に合体した双方の枠体の駒受部４１ｃ，４１ｃに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ている。
【００４２】
相対向する側板５，５間には、突張り棒９として長尺の撓み難い金属製又は硬質合成樹脂製の丸パイプが掛け渡され、その両端が側板５，５の棒受部５ｂ，５ｂに嵌込まれて脱落しないように取付けられている。即ち、この側板５には前述したように４つの棒受部５ｂが形成されているので、左右の側板５，５間に２本の突張り棒９を架け渡して、その両端を上側の二つの棒受部５ｂ，５ｂに嵌込むと共に、前後の側板間にも２本の突張り棒９を架け渡して、その両端を下側の二つの棒受部５ｂ，５ｂに嵌込むことにより、左右方向の２本の突張り棒９と前後方向の２本の突張り棒９が当たらないように上下に位置をずらせて取付けられている。
【００４３】
この側板５の棒受部５ｂは円環状に形成されているので、突張り棒９として丸パイプを使用しているが、突張り棒９は斯かる丸パイプに限定されるものではなく、種々の断面形状を有する中空又は中実の棒材を使用することが可能であり、特に、上下方向よりも左右方向に撓み難い断面形状（例えば横長の長円形、長方形、Ｈ形などの断面形状）を有する棒材が好適に使用される。このような断面形状の突張り棒９を相対向する側板５，５間に架け渡すと、側板５，５に土圧が作用したとき、突張り棒９が上下方向に撓むことはあっても左右方向に撓むことはないので、突張り棒９が充填体４の脚柱４２に側方から当たって座屈させる恐れは生じない。
【００４４】
尚、上記のような種々の断面形状を有する突張り棒９を架け渡す場合は、その断面形状に対応合致した形状の棒受部５ｂを側板５の片面に形成する必要があることは言うまでもない。
【００４５】
この側板５は４つの円環状の棒受部５ｂを形成しているが、棒受部５ｂの個数を変更したり、棒受部５ｂの形状を突張り棒９を嵌込みやすい形状に変更してもよい。図６は、そのように棒受部の個数と形状を変更した側板の他の例を示す正面図、図７は同側板への突張り棒の取付け状態を示す部分斜視図である。
【００４６】
即ち、この側板５０は片面に８つの棒受部５０ｂが設けられたもので、棒受部５０ｂは上部が開放したＵ字形に形成されている。そのため、開放した上部から突張り棒９の端部を棒受部５０ｂへ極めて簡単に嵌込むことができるようになっている。
【００４７】
このような側板５０を使用すると、例えば図７に示すように、左右方向に架け渡した４本の突張り棒９の端部を側板５０の最上段の２つ棒受部５０ｂと最下段の２つの棒受部５０ｂに嵌込むと共に、前後方向に架け渡した４本の突張り棒９の端部を側板５０の第二段目の２つの棒受部５０ｂと第三段目の２つ棒受部５０ｂに嵌込むことによって、左右方向の突張り棒９と前後方向の突張り棒９が当たらないように位置を上下にずらせて４本ずつ架け渡すことができるので、突張り棒９の本数が増加した分だけ耐圧強度を更に向上させることができる。
【００４８】
この側板５０は、前記の側板５と同様にＬ形の突片５ｄを充填体４の枠体４１に形成された凹部４１ｄに係止させることによって、充填体４の外側に取付けられ、また、天板６として共用できるものであるが、前記の側板５と異なり脚柱４２を嵌合させる嵌合穴が形成されていないため、底板３として共用することはできない。尚、９つの嵌合穴を形成すれば、底板３として共用できることは言うまでもない。
【００４９】
以上のような地下水槽の充填構造では、地下水槽１の周囲から大きい土圧が側板５（５０）に作用しても、側板５（５０）が突張り棒９で内側から押されているため、土圧に充分耐えることができる。従って、側板５（５０）が破壊されて周囲の土砂が地下水槽１内へ入り込む心配は皆無に等しい。
【００５０】
そして、地面に降った雨水は被覆土８、透水シート７を浸透して、充填体４が積み上げられた地下水槽１内へ流入し、或は、流入パイプ（不図示）を通じて地下水槽１内へ流入し、遮水シート２で地下へ浸透しないように貯溜されて、必要なときに取水パイプ（不図示）を通じて有効利用される。
【００５１】
尚、浸透型の地下水槽とする場合は、遮水シート２を除去して地下水槽１の底部に砂を敷き、地下水槽の側面に透水シートを添設すればよく、このようにすると、地下水槽１へ流入した雨水は底面の砂層や側面の透水シートを通って地下へ浸透、排水される。
【００５２】
上記実施形態の充填構造では、側板５（５０）のＬ形の突片５ｄを充填体４の枠体４１に形成された凹部４１ｄに係止させることによって、側板５（５０）を充填体４の外側に取付けているだけであるため、大きい地震が発生すると、側板５（５０）の突片５ｄが充填体の凹部４１ｄから外れて側板５（５０）が脱落し、その脱落箇所から土砂が地下水槽１内へ浸入する恐れがある。
【００５３】
これを防止するためには、図８に示すように、側板５（５０）の外側からタッピングネジ等の止具１２を突張り棒９の一端にねじ込むなどの手段で、突張り棒９の一端を側板５（５０）に固着すると共に、同様の手段で突張り棒９の他端も相対向する側板に固着すればよい。このように突張り棒９の両端を相対向する側板５（５０）に固着すると、地震が発生しても、側板５（５０）の突片５ｄが充填体の凹部４１ｄから外れなくなり、側板５（５０）の脱落が防止されるので、土砂が地下水槽内へ浸入するのを阻止することができる。
【００５４】
また、図９に示すように、側板５（５０）の外側に押え棒１３を添設し、その外側から止具１２をねじ込むなどの手段で、該押え棒１３を突張り棒９の端部に固着してもよい。このようにすると、地震が発生しても、押え棒１３が突張り棒９の端部から分離することなく、側板５（５０）を外側から押えるので、側板５（５０）が脱落しなくなり、土砂の浸入を阻止することができる。
【００５５】
尚、図８、図９に示すように止具１２を突張り棒９にねじ込む場合は、中実の突張り棒、又は、少なくとも端部を中実にした突張り棒を、相対向する側板５（５０）の間に架け渡す必要があることは言うまでもない。
【００５６】
図１０は本発明の更に他の実施形態に係る地下水槽の充填構造を示す概略断面図、図１１は同充填構造に用いる中間板の断面図である。
【００５７】
図１０に示す充填構造は、縦横に隣接する充填体４の間に中間板１１を配設して、この中間板１１と、この中間板１１に対向する両側の側板５０との間に突張り棒９を架け渡したものである。側板５０は、前述した図６に示す側板５０と同じものである。
【００５８】
図１１に示すように、中間板１１はその両面に棒受部１１ａを設けたもので、棒受部１１ａの形状は、図６に示す側板５０の棒受部５０ｂと同じ上部を開放したＵ字形とされている。そして、この中間板１１の棒受部１１ａの個数も側板５０の棒受部５０ｂと同様に片面に８個であり、その配置も同様である。
【００５９】
また、この中間板１１の一辺の長さは側板５０のそれと同一であり、この中間板１１の四辺には、側板５０の突片５ｄと同じＬ形の突片１１ｂが両側に突き出して形成されている。そして、この両側に突き出した突片１１ｂ，１１ｂを両側の充填体４，４の枠体４１，４１に形成された凹部４１ｄに係止させることによって、二段に積み重ねられた充填体に対して１枚の割合で中間板１１が取付けられており、この中間板１１を介して両側の充填体４，４の枠体４１，４１が連結されている。
【００６０】
更に、この中間板１１と左右両側の側板５０との間、及び、前後の側板５０の間には、突張り棒９が４本ずつ上下に位置をずらせて掛け渡され、その端部が中間板１１及び側板５０のそれぞれの棒受部１１ａ，５０ｂに嵌込まれて、脱落しないように取付けられている。
【００６１】
尚、図示はしていないが、中間板１１には多数の小孔が穿孔され、この小孔を通じて地下水槽１内の雨水が自由に流通できるようになっている。
【００６２】
この充填構造の他の構成は、前述した図１の実施形態の充填構造と同様であるので、同一部材に同一符号を付して説明を省略する。
【００６３】
この充填構造のように、中間板１１を配設して突張り棒９を中間板１１と両側の側板５０との間に同軸的に架け渡すと、相対向する左右の側板５０，５０間に突張り棒を架け渡す場合のように長尺の突張り棒を使用する必要がなくなって、中間板１１と側板５０との間隔に等しい短尺の突張り棒９を使用できるようになり、このような短尺の突張り棒９は、側壁５０に土圧が作用したとき、長尺の突張り棒よりも撓み難いので、耐圧強度を充分に向上させることができる。
【００６４】
尚、図１０に示す充填構造では、地下水槽１のちょうど中間に中間板１１を配置しているが、中間板１１の配置間隔を狭めて数箇所に配置し、中間板１１と中間板１１又は側板５０との間に、更に短尺の突張り棒９を同軸的に架け渡すようにしてもよい。
【００６５】
また、図８、図９の場合の同様に、必要に応じて、中間板１１と側板５０との間に架け渡した突張り棒９の両端部を該中間板１１と該側板５０に止具等で固着することによって、地震の際に側板５０が脱落しないようにしたり、或は、側板５０の外側に押え棒（不図示）を添設して、該押え棒を中間板１１と側板５０との間に架け渡した突張り棒９の端部に止具等で固着することによって、側板５０が脱落しないようにし、地下水槽内への土砂の浸入を阻止するのもよい。
【００６６】
以上説明した実施形態の充填構造では、９本の脚柱４２を枠体４１の嵌合孔４１ａに嵌着した充填体４を使用しているが、脚柱４２の本数を増減したり、枠体４１と脚柱４２を合成樹脂で一体成形した充填体を使用してもよい。そのような充填体の好ましい例としては、４本の脚柱を枠体の片面側の四隅に一体成形すると共に、各脚柱の先端に深い穴を形成し、枠体の片面側に補強リブを形成した充填体を挙げることができる。
【００６７】
斯かる充填体は、脚柱を上側にして縦横に並べると共に、脚柱先端の穴に連結用の中子の下半分を挿入し、その上から、脚柱を下側にして上段の充填体を重ね、その脚柱先端の穴に上記中子の上半分を挿入することによって、脚柱同士を上下に接合した状態で積み重ねられて充填される。
【００６８】
上記のように脚柱同士を接合した状態で充填体を積み重ねると、上下の充填体の枠体の間隔が広くなって脚柱の長さの２倍となり、側板５が土圧によって破壊されやすくなるので、本発明の充填構造を採用して側板５を突張り棒９で内側から支えると、側板５の破壊を有効に防止して耐圧強度を顕著に向上させることができる。
【００６９】
また、上記のように脚柱同士を接合した状態で充填体を積み重ねた場合は、脚柱に横方向からの外力が作用すると比較的簡単に座屈する恐れがあるが、その場合、突張り棒として既述したような左右方向に撓み難い断面形状の突張り棒を用いると、この座屈を確実に防止できるので極めて有効である。
【００７０】
【発明の効果】
以上の説明から明らかなように、本発明の地下水槽の充填構造は、地下水槽の周囲から大きい土圧が側板に作用しても、側板が突張り棒で内側から支えられるので、土圧に充分耐えられるようになり、側板が破壊されて周囲の土砂が地下水槽内へ浸入するのを防止できると共に、突張り棒の左右方向の撓みによって充填体の脚柱が座屈するのを防止できるといった顕著な効果を奏する。そして、突張り棒の端部を側板に固着したり、側板の外側に添設した押え棒を突張り棒の端部に固着したものは、地震の際に側板の脱落を防止でき、土砂の浸入を阻止できると言った効果を併せて奏する。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る地下水槽の充填構造を示す概略断面図である。
【図２】同充填構造に用いる充填体と側板の斜視図である。
【図３】同充填構造の拡大部分断面図である。
【図４】充填体への側板と天板の取付け方を示す部分斜視図である。
【図５】充填体の枠体相互の連結の仕方を示す部分斜視図である。
【図６】側板の他の例を示す正面図である。
【図７】同側板への突張り棒の取付け状態を示す部分斜視図である。
【図８】本発明の他の実施形態に係る地下水槽の充填構造を示す概略部分断面図である。
【図９】本発明の更に他の実施形態に係る地下水槽の充填構造を示す概略部分断面図である。
【図１０】本発明の更に他の実施形態に係る地下水槽の充填構造を示す概略断面図である。
【図１１】同充填構造に用いる中間板の断面図である。
【符号の説明】
１地下水槽
４充填体
４１充填体の枠体
４２充填体の脚柱
５，５０側板
５ｂ，５０ｂ側板の棒受部
９突張り棒
１１中間板
１１ａ中間板の棒受部
１２止具
１３押え棒[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage structure of a storage type or seepage type underground water tank constructed underground, and more particularly to a filling structure of a ground water tank with increased strength against earth pressure from the surroundings.
[0002]
[Prior art]
In urbanized areas where there are few unpaved roads and open spaces, rainwater flows into rivers through side ditches without penetrating into the ground. The so-called urban flooding is caused by exceeding the capacity. On the other hand, since the water level of dams and lakes falls during the dry season, water supply is limited in various places.
[0003]
Under such circumstances, it has been attempted to install an infiltration type groundwater tank to temporarily store rainwater and then gradually infiltrate it into the basement, or to provide a storage type groundwater tank to effectively use the stored rainwater. I came.
[0004]
As such a storage-type underground water tank, water shielding sheets are provided on the bottom and side surfaces of the water tank formed underground by excavating the ground, and synthetic resin fillings are arranged vertically and horizontally and stacked vertically. What has the structure filled and covered the water-permeable sheet on it and covered with soil is known. Further, as a permeable type underground water tank, a water permeable sheet is provided along its side surface, and similarly, a filling body is filled inside the water tank, and the structure is covered with a water permeable sheet and soil. ing.
[0005]
In these storage-type and infiltration-type groundwater tanks, it is preferable to use a structure in which several long pedestals are provided on the frame body as a filling body, and a synthetic resin side plate is provided on the outer periphery of the stacked filling bodies. Often installed.
[0006]
[Problems to be solved by the invention]
However, as described above, the filling structure made of synthetic resin with pedestals arranged vertically and horizontally and stacked up and down to fill the underground water tank, and the filling structure provided with the synthetic resin side plate on the outer periphery is made by the side plate. Although the pressure strength against the earth pressure from the surroundings is somewhat improved, the side plate alone is not enough to withstand the pressure, so the side plates are destroyed by the earth pressure from the surroundings, and there is concern that the soil will enter the groundwater tank and be crushed was there. In particular, when stacking long fillers, there is a problem in that the side plates are easily broken by earth pressure because the vertical space of the frame of the fillers supporting the side plates from the inside becomes wide.
[0007]
To increase the strength of the side plate, it is only necessary to increase the thickness of the side plate or to form reinforcing ribs on the side plate. However, there is a limit to increasing the strength of the side plate by such a method, because a large amount of resin is used. Not only will the cost increase, but the weight of the side plate will increase, making it difficult to carry, leading to a decrease in workability.
[0008]
Further, in the above filling structure, the side plate is easily dropped when an earthquake occurs, so there is a concern that soil may enter the underground water tank from the dropped portion.
[0009]
The present invention has been made to cope with the above-mentioned problems, and the purpose of the present invention is to have a high pressure resistance against the earth pressure from the surroundings, and the side plate is destroyed by the earth pressure, or the side plate is dropped by the earthquake. The object of the present invention is to provide a groundwater tank filling structure without worry.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the groundwater tank filling structure according to claim 1 of the present invention is such that a plurality of long pedestals provided in a frame body are arranged vertically and horizontally and stacked vertically in the groundwater tank. In a filling structure in which a side plate is provided on the outer periphery of the filler, a strut rod having a cross-sectional shape that is less likely to bend in the left-right direction than in the up-down direction through between the pillars of the filler is bridged between the opposing side plates. It is characterized by that.
[0011]
When a tension rod is bridged between opposing side plates like this filling structure, even if a large earth pressure acts on the side plate from the surroundings, the side plate is supported from the inside by the tension rod and sufficiently withstands the earth pressure. The fear of the side plate being destroyed is resolved. In addition, when the strut bar has a cross-sectional shape that is less likely to bend in the left-right direction than in the up-down direction as in this filling structure, the strut bar bends in the up-down direction when earth pressure acts on the side plate. However, there is no possibility that the stick sticks to the buckle of the filler body from the side and buckles.
[0012]
Next, the filling structure of the underground water tank according to claim 2 of the present invention is the filling structure according to claim 1, wherein a rod receiving portion is formed on the inner surface of the side plate, and an end portion of the projecting rod is used as the rod receiving portion. It is characterized by being fitted.
[0013]
Like this filling structure, when the end of the strut rod is fitted into the rod receiving portion on the inner surface of the side plate, the strut rod can be easily supported in a state of being spanned between the side plates. The stick will not come off.
[0014]
Next, in the groundwater tank filling structure according to claim 3 of the present invention, in the groundwater tank, the filling bodies provided with several long pedestals on the frame are arranged vertically and horizontally, and the top and bottom are stacked and filled. In the filling structure in which side plates are provided on the outer periphery, an intermediate plate is disposed between the fillers adjacent to each other in the vertical and horizontal directions, and has a cross-sectional shape that is less likely to bend in the horizontal direction than in the vertical direction through the legs of the filler . A strut rod is bridged between the intermediate plate and a side plate or intermediate plate facing the intermediate plate.
[0015]
Like this filling structure, when the intermediate plate is arranged and the strut rod is bridged between the intermediate plate and the side plate or the intermediate plate, the long strut rod equal to the distance between the opposing side plates is replaced. It is possible to use a short strut rod equal to the distance between the intermediate plate and the side plate or the intermediate plate, and such a short strut rod is a long strut rod when earth pressure acts on the side wall. Therefore, the pressure strength can be sufficiently improved. In addition, this strut rod has a cross-sectional shape that is less likely to bend in the left-right direction than the vertical direction, so that when the earth pressure acts on the side wall, the strut rod strikes the pedestal of the filler from the side and buckles. There is no fear of making it happen.
[0016]
Next, the filling structure of the underground water tank according to claim 4 of the present invention is the filling structure according to claim 3, wherein the rod receiving portions are formed on the inner surface of the side plate and the rod receiving portions are formed on both surfaces of the intermediate plate. The end of the tension rod is fitted into the rod receiving portion.
[0017]
Such a filling structure can also be easily supported so as not to drop the strut rods spanned between the intermediate plate and the side plate.
[0018]
Next, the groundwater tank filling structure according to claim 5 of the present invention is the filling structure according to claim 2 or claim 4, wherein the bar receiving portion has an open shape at the top and protrudes from the open top. The end of the tension bar is fitted into the bar receiving part.
[0019]
In this way, the work of fitting the strut rod into the rod receiving portion becomes very simple, and the strut rod does not fall off the rod receiving portion.
[0022]
Next, the underground water tank filling structure according to claim 6 of the present invention is characterized in that, in the filling structure of claim 1, the end of the strut rod is fixed to the side plate.
[0023]
In this way, when the end portion of the tension bar is fixed to the side plate, the side plate does not fall off even if an earthquake occurs, so that it is possible to prevent soil from entering the underground water tank.
[0024]
Next, the groundwater tank filling structure according to claim 7 of the present invention is the filling structure according to claim 1, wherein a presser bar is attached to the outside of the side plate, and the presser bar is attached to the end of the tension bar. It is characterized by being fixed.
[0025]
In such a filling structure, even if an earthquake occurs, the presser bar is not separated from the end of the tension bar, and the side plate is pressed from the outside by the presser bar, so that the side plate can be prevented from falling off. it can.
[0026]
Next, the filling structure of the underground water tank according to claim 8 of the present invention is the filling structure according to claim 3, wherein both ends of the strut rods spanned between the intermediate plate and the side plate are connected to the intermediate plate. And fixed to the side plate.
[0027]
Also in this filling structure, since both ends of the strut rod are fixed to the side plate and the intermediate plate, the side plate does not fall off in the event of an earthquake, and it is possible to prevent soil from entering the underground water tank.
[0028]
Next, the groundwater tank filling structure according to claim 9 of the present invention is the filling structure according to claim 3, wherein a presser bar is provided outside the side plate, and the presser bar is connected to the intermediate plate and the side plate. It is characterized in that it is fixed to the end of a strut rod that is bridged between them.
[0029]
This filling structure can also prevent the side plate from falling off because the presser bar presses the side plate without being separated from the tension bar in the event of an earthquake.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
[0031]
1 is a schematic cross-sectional view showing a filling structure of a groundwater tank according to an embodiment of the present invention, FIG. 2 is a perspective view of a filling body and side plates used in the filling structure, and FIG. 3 is an enlarged partial cross-sectional view of the filling structure, FIG. 4 is a partial perspective view showing how to attach the side plate and the top plate to the filling body, and FIG. 5 is a partial perspective view showing how the frame bodies of the filling body are connected to each other.
[0032]
The embodiment of FIG. 1 illustrates a filling structure of a storage-type groundwater tank. A water shielding sheet 2 is attached to the bottom and side surfaces of the groundwater tank 1 formed by excavating the ground. A bottom plate 3 is laid in the bottom and side by side. And the inside of this underground water tank 1 is filled with the filling body 4 provided with the pedestal column 42 vertically and horizontally, piled up and down, and the side plate 5 is attached to the outer periphery. Further, a top plate 6 and a water permeable sheet 7 are overlaid on the uppermost filler 4, and a soil 8 is covered from the top plate 6, and a pressure resistance strength is provided between the opposing side plates 5 and 5. A strut rod 9 is extended between the leg posts 42 of the filling body 4.
[0033]
As shown in FIGS. 1, 2 and 3, the filling body 4 is composed of a square frame 41 injection-molded with a synthetic resin such as polypropylene and a long cylindrical pedestal 42 as shown. Thus, a total of nine fitting holes 41a for fitting the leg posts 42 from above and below are formed in the four corners, the center and the middle of the four sides of the frame body 41, and the upper ends of the leg posts 42 are formed in the respective fitting holes 41a. The unit is fitted from below to form one unit of the filler 4.
[0034]
A node portion 42a is formed on the upper and lower portions of the pedestal 42, and when the upper end portion or the lower end portion of the pedestal column 42 is fitted into the fitting hole 41a of the frame body 41 from below or above, the node portion 42a is formed. It engages with the peripheral edge of the fitting hole 41a so that it cannot be fitted any deeper.
[0035]
In addition, several large through holes 41b are formed in the frame body 41 in order to reduce weight and save materials. Further, on the four sides of the frame body 41, a total of eight piece receiving portions 41c into which one side portion of an H-shaped connecting piece, which will be described later, can be inserted, are formed in two places. A total of 16 recesses 41d and 41e to be locked are formed in four locations near the corners of the four sides.
[0036]
On the other hand, the side plate 5 is injection-molded with a synthetic resin such as polypropylene similar to that of the filler 4. As shown in FIG. 2, as shown in FIG. A total of nine fitting holes 5a into which the end portions of the pedestals 42 can be fitted are formed in the portion. A total of four rod receiving portions 5b are formed between the fitting hole 5a at the center and the fitting holes 5a at the four corners, and the fitting holes 5a and the rod receiving portions 5b are vertically, horizontally, It is connected in an oblique direction. Each of the fitting hole 5a and the rod receiving portion 5b is formed in an annular shape from one side of the side plate 5, and the end portion of the projecting rod 9 is fitted into the rod receiving portion 5b. ing.
[0037]
Further, near the corners of the four sides of the side plate 5, an L-shaped protruding piece 5d and a notch recess 5e are formed, and the side plate 5 is attached to the filler 4 by the protruding piece 5d. Although not shown, the side plate 5 is provided with a large number of small holes for weight reduction.
[0038]
Both the bottom plate 3 and the top plate 6 share the side plate 5 described above. That is, as shown in FIG. 3, the above-mentioned side plate 5 is used as the bottom plate 3, and the bottom plate 3 (side plate 5) is arranged vertically and horizontally so that one side where the fitting hole 5a is formed is on the upper side. The lower ends of the pillars 42 of the filler 4 are fitted into the fitting holes 5a of the bottom plates 3 (side plates 5), and the first-stage fillers 4 are arranged vertically and horizontally.
[0039]
Then, the second-stage filling body 4 is stacked on the first-stage filling body 4, and the lower end portion of the leg post 42 is fitted into the fitting hole 41 a of the frame body 41 of the first-stage filling body 4. The filler 4 is stacked in several stages in the same manner, and the side plate 5 is attached as the top plate 6 on the uppermost filler 4. As shown in FIG. 3, the top plate 6 (side plate 5) is overlaid on the frame 41 of the uppermost filler 4 with one side having the fitting hole 5a formed on the lower side, as shown in FIG. Thus, each protrusion 5d of the top plate 6 (side plate 5) is fitted into each recess 41e of the frame body 41 so as not to be displaced from front to back and from side to side.
[0040]
As shown in FIG. 4, the side plate 5 is attached to the outside of the filling body 4 by locking the L-shaped protruding piece 5 d to a recess 41 d formed in the frame body 41 of the filling body 4. The length of one side of the side plate 5 is the same as the length of one side of the frame body 41 of the filling body 4, and the length of one side of the frame body 41 is the same as the height of the filling bodies 4 stacked in two stages. Therefore, one side plate 5 is attached to the filler 4 stacked in two stages.
[0041]
As shown in FIG. 5, the frame bodies 41 of the filling body 4 adjacent to each other vertically and horizontally are connected to the frame receiving portions 41c and 41c of both frame bodies which are combined with the H-shaped connecting piece 10 from above. By being inserted, they are connected so as not to be separated and not to be displaced.
[0042]
Between the opposing side plates 5 and 5, a long metal pipe or a hard synthetic resin round pipe which is difficult to bend is stretched as a projecting rod 9, and both ends thereof are rod receiving portions 5 b and 5 b of the side plates 5 and 5. It is attached so that it does not fall off. That is, since the four rod receiving portions 5b are formed on the side plate 5 as described above, two projecting rods 9 are bridged between the left and right side plates 5 and 5, and both ends thereof are connected to the upper two. By fitting the two rod receiving portions 5b and 5b, and also spanning the two projecting rods 9 between the front and rear side plates, and fitting the both ends into the lower two rod receiving portions 5b and 5b, The two vertical sticks 9 in the left-right direction and the two vertical sticks 9 in the front-rear direction are attached so as to be shifted vertically.
[0043]
Since the rod receiving portion 5b of the side plate 5 is formed in an annular shape, a round pipe is used as the strut rod 9, but the strut rod 9 is not limited to such a round pipe. It is possible to use a hollow or solid bar having a cross-sectional shape of, and particularly, a cross-sectional shape that is less likely to bend in the left-right direction than in the up-down direction (for example, a cross-sectional shape such as a horizontally long oval, a rectangle, or an H shape). A bar having the following is preferably used. When the tension bar 9 having such a cross-sectional shape is bridged between the opposing side plates 5 and 5, when the earth pressure acts on the side plates 5 and 5, the tension bar 9 may be bent in the vertical direction. Since there is no bending in the left-right direction, there is no possibility that the stick 9 will strike the leg column 42 of the filler 4 from the side and buckle.
[0044]
Needless to say, when the projecting rod 9 having various cross-sectional shapes as described above is bridged, it is necessary to form the bar receiving portion 5b having a shape corresponding to the cross-sectional shape on one side of the side plate 5. .
[0045]
The side plate 5 forms four annular rod receiving portions 5b. However, the number of the rod receiving portions 5b is changed, or the shape of the rod receiving portion 5b is changed to a shape in which the protruding rod 9 can be easily fitted. May be. FIG. 6 is a front view showing another example of the side plate in which the number and shape of the bar receiving portions are changed as described above, and FIG. 7 is a partial perspective view showing a state where the tension bar is attached to the side plate.
[0046]
That is, the side plate 50 is provided with eight rod receiving portions 50b on one side, and the rod receiving portion 50b is formed in a U-shape with an open top. For this reason, the end of the projecting bar 9 can be fitted into the bar receiving part 50b very easily from the opened upper part.
[0047]
When such a side plate 50 is used, for example, as shown in FIG. 7, the end portions of the four struts 9 spanned in the left-right direction are connected to the uppermost two bar receiving portions 50 b of the side plate 50 and the lowermost step. The end portions of the four struts 9 that are fitted in the two rod receiving portions 50b and spanned in the front-rear direction are connected to the two second rod receiving portions 50b of the second plate of the side plate 50 and the two of the third step. By fitting in the rod receiving portion 50b, it is possible to hang up and down four positions by shifting the position up and down so that the left and right strut bars 9 and the front and rear strut bars 9 do not hit each other. The pressure strength can be further improved by the increase in the number of the wires.
[0048]
The side plate 50 is attached to the outside of the filling body 4 by locking the L-shaped projecting piece 5d to the recess 41d formed in the frame body 41 of the filling body 4 in the same manner as the side plate 5 described above. Although it can be shared as the top plate 6, unlike the side plate 5, since the fitting hole for fitting the pedestal 42 is not formed, it cannot be shared as the bottom plate 3. Needless to say, if the nine fitting holes are formed, the bottom plate 3 can be shared.
[0049]
In the filling structure of the groundwater tank as described above, even if a large earth pressure acts on the side plate 5 (50) from the periphery of the groundwater tank 1, the side plate 5 (50) is pushed from the inside by the tension rod 9. Can withstand the earth pressure sufficiently. Therefore, there is no fear that the side plate 5 (50) is destroyed and the surrounding earth and sand enter the underground water tank 1.
[0050]
Then, rainwater that has fallen on the ground penetrates the covering soil 8 and the water permeable sheet 7 and flows into the underground water tank 1 in which the fillers 4 are stacked, or into the underground water tank 1 through an inflow pipe (not shown). It flows in and is stored so as not to penetrate underground with the water shielding sheet 2, and is effectively used through a water intake pipe (not shown) when necessary.
[0051]
In the case of an osmotic groundwater tank, it is only necessary to remove the water-impervious sheet 2 and lay sand on the bottom of the groundwater tank 1 and attach a permeable sheet to the side of the groundwater tank. Rainwater that has flowed into the water tank 1 penetrates and drains into the basement through the sand layer on the bottom and the water-permeable sheet on the side.
[0052]
In the filling structure of the above embodiment, the side plate 5 (50) is fixed to the filling body 4 by engaging the L-shaped projecting piece 5d of the side plate 5 (50) with the recess 41d formed in the frame body 41 of the filling body 4. Therefore, when a large earthquake occurs, the projecting piece 5d of the side plate 5 (50) is detached from the recessed portion 41d of the filler, and the side plate 5 (50) falls off. There is a risk of intrusion into the underground water tank 1.
[0053]
In order to prevent this, as shown in FIG. 8, one end of the tension bar 9 is screwed into the end of the tension bar 9 by a means such as screwing a stopper 12 such as a tapping screw from the outside of the side plate 5 (50). Is fixed to the side plate 5 (50), and the other end of the projecting rod 9 may be fixed to the opposite side plate by the same means. If both ends of the tension bar 9 are fixed to the opposite side plates 5 (50) in this way, even if an earthquake occurs, the protruding pieces 5d of the side plates 5 (50) will not come off from the concave portions 41d of the filler, and the side plates 5 Since the dropout of (50) is prevented, it is possible to prevent earth and sand from entering the underground water tank.
[0054]
Further, as shown in FIG. 9, the presser bar 13 is attached to the outer side of the side plate 5 (50), and the presser bar 13 is attached to the end of the tension bar 9 by means of screwing the stopper 12 from the outer side. You may stick to. In this way, even if an earthquake occurs, the presser bar 13 does not separate from the end of the tension bar 9 and presses the side plate 5 (50) from the outside, so the side plate 5 (50) does not fall off, Infiltration of earth and sand can be prevented.
[0055]
8 and 9, when the stopper 12 is screwed into the strut rod 9, a solid strut rod or a strut rod having at least a solid end is attached to the opposite side plates 5. Needless to say, it is necessary to bridge between (50).
[0056]
FIG. 10 is a schematic cross-sectional view showing a groundwater tank filling structure according to still another embodiment of the present invention, and FIG. 11 is a cross-sectional view of an intermediate plate used in the filling structure.
[0057]
In the filling structure shown in FIG. 10, the intermediate plate 11 is disposed between the fillers 4 adjacent to each other in the vertical and horizontal directions, and the intermediate plate 11 is stretched between the side plates 50 on both sides facing the intermediate plate 11. A rod 9 is bridged. The side plate 50 is the same as the side plate 50 shown in FIG.
[0058]
As shown in FIG. 11, the intermediate plate 11 is provided with rod receiving portions 11a on both sides thereof, and the shape of the rod receiving portion 11a is the same as the rod receiving portion 50b of the side plate 50 shown in FIG. It is shaped like a letter. The number of the bar receiving portions 11a of the intermediate plate 11 is also eight on one side like the bar receiving portions 50b of the side plates 50, and the arrangement thereof is also the same.
[0059]
Further, the length of one side of the intermediate plate 11 is the same as that of the side plate 50, and the same L-shaped protruding pieces 11 b as the protruding pieces 5 d of the side plate 50 are formed on both sides of the intermediate plate 11 so as to protrude on both sides. ing. Then, the protruding pieces 11b, 11b protruding on both sides are engaged with the recessed parts 41d formed on the frame bodies 41, 41 of the filling bodies 4, 4 on both sides, thereby making the filling bodies stacked in two stages. The intermediate plate 11 is attached at a rate of one sheet, and the frame bodies 41 and 41 of the fillers 4 and 4 on both sides are connected via the intermediate plate 11.
[0060]
Further, between the intermediate plate 11 and the left and right side plates 50 and between the front and rear side plates 50, four strut bars 9 are hung from each other up and down, and the end portions are intermediate. The plate 11 and the side plate 50 are fitted in the respective rod receiving portions 11a and 50b so as not to fall off.
[0061]
Although not shown, the intermediate plate 11 has a large number of small holes, through which the rainwater in the underground water tank 1 can freely flow.
[0062]
Since the other structure of this filling structure is the same as that of the embodiment shown in FIG.
[0063]
As in this filling structure, when the intermediate plate 11 is disposed and the projecting rod 9 is coaxially bridged between the intermediate plate 11 and the side plates 50 on both sides, the left and right side plates 50, 50 facing each other are disposed. There is no need to use a long tension rod as in the case of spanning the tension rod, and a short tension rod 9 equal to the distance between the intermediate plate 11 and the side plate 50 can be used. Since the short strut rod 9 is less likely to bend than the long strut rod when earth pressure acts on the side wall 50, the pressure strength can be sufficiently improved.
[0064]
In the filling structure shown in FIG. 10, the intermediate plate 11 is arranged just in the middle of the underground water tank 1, but the arrangement interval of the intermediate plates 11 is narrowed and arranged in several places, and the intermediate plate 11 and the intermediate plate 11 or Further, a shorter projecting rod 9 may be coaxially bridged between the side plate 50 and the side plate 50.
[0065]
Further, as in the case of FIG. 8 and FIG. 9, if necessary, both ends of the tension bar 9 spanned between the intermediate plate 11 and the side plate 50 are fixed to the intermediate plate 11 and the side plate 50. The side plate 50 is prevented from falling off in the event of an earthquake, or a presser bar (not shown) is attached to the outside of the side plate 50, and the presser bar is attached to the intermediate plate 11 and the side plate 50. It is also possible to prevent the side plate 50 from falling off and to prevent the intrusion of earth and sand into the underground water tank by fixing it to the end of the strut rod 9 spanned between them with a stopper or the like.
[0066]
In the filling structure of the embodiment described above, the filling body 4 in which the nine leg posts 42 are fitted in the fitting holes 41a of the frame body 41 is used. However, the number of the leg posts 42 can be increased or decreased. You may use the filling body which integrally formed the body 41 and the pedestal 42 with the synthetic resin. As a preferable example of such a filling body, four leg columns are integrally formed at four corners on one side of the frame body, deep holes are formed at the ends of the respective leg columns, and reinforcing ribs are formed on one side of the frame body. Can be mentioned.
[0067]
Such a packing body is arranged vertically and horizontally with the pedestal on the upper side, and the lower half of the connecting core is inserted into the hole at the tip of the pedestal, and from above, the upper column with the pedestal on the lower side. And the upper half of the core is inserted into the hole at the tip of the pedestal, so that the pedestals are stacked and filled in a state where they are joined up and down.
[0068]
When the fillers are stacked in a state where the pedestals are joined together as described above, the space between the upper and lower fillers is widened to be twice the length of the pedestals, and the side plate 5 is easily destroyed by earth pressure. Therefore, when the side plate 5 is supported from the inner side by the tension rod 9 using the filling structure of the present invention, the side plate 5 can be effectively prevented from being broken and the pressure strength can be remarkably improved.
[0069]
In addition, when the fillers are stacked in a state where the pedestal columns are joined as described above, there is a risk of buckling relatively easily when an external force is applied to the pedestal from the lateral direction. As described above, it is extremely effective to use a projecting rod having a cross-sectional shape that is difficult to bend in the left-right direction because this buckling can be reliably prevented.
[0070]
【The invention's effect】
As is clear from the above description, the groundwater tank filling structure according to the present invention is not affected by earth pressure because the side plate is supported from the inside by a tension rod even if a large earth pressure acts on the side plate from the periphery of the underground water tank. sufficiently withstand such becomes both the sediment around the side plate is broken can be prevented from infiltrating into the underground water tank, it is possible to prevent the pedestal packing buckles by the deflection in the lateral direction of突張Ri rod a marked effect was saying. And when the end of the tension bar is fixed to the side plate, or the presser bar attached to the outside of the side plate is fixed to the end of the tension bar, the side plate can be prevented from falling off in the event of an earthquake. Combined with the effect of preventing intrusion.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a groundwater tank filling structure according to an embodiment of the present invention.
FIG. 2 is a perspective view of a filling body and side plates used in the filling structure.
FIG. 3 is an enlarged partial sectional view of the filling structure.
FIG. 4 is a partial perspective view showing how to attach the side plate and the top plate to the filling body.
FIG. 5 is a partial perspective view showing how the frames of the filler are connected to each other.
FIG. 6 is a front view showing another example of a side plate.
FIG. 7 is a partial perspective view showing a state in which a tension bar is attached to the same side plate.
FIG. 8 is a schematic partial cross-sectional view showing a groundwater tank filling structure according to another embodiment of the present invention.
FIG. 9 is a schematic partial cross-sectional view showing a groundwater tank filling structure according to still another embodiment of the present invention.
FIG. 10 is a schematic cross-sectional view showing a groundwater tank filling structure according to still another embodiment of the present invention.
FIG. 11 is a cross-sectional view of an intermediate plate used in the filling structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Groundwater tank 4 Filling body 41 Filling body frame 42 Filling body pillars 5, 50 Side plate 5b, 50b Side plate rod receiving portion 9 Strut rod 11 Intermediate plate 11a Intermediate plate rod receiving portion 12 Stopper 13 Presser bar

Claims

In a groundwater tank, a filling structure in which several long pedestals are provided in a frame is arranged vertically and horizontally, and is stacked and stacked vertically, and in the filling structure in which side plates are provided on the outer periphery, the space between the pedestals of the filling body is passed through. 1. A groundwater tank filling structure characterized in that a strut rod having a cross-sectional shape that is less likely to bend in the left-right direction than in the up-down direction is bridged between opposing side plates.

The filling structure of the underground water tank according to claim 1, wherein a rod receiving portion is formed on an inner surface of the side plate, and an end portion of the projecting rod is fitted into the rod receiving portion.

In the groundwater tank, a packing structure in which several long pedestals are arranged in a frame is arranged vertically and horizontally, and is stacked up and down, and a side plate is provided on the outer periphery. An intermediate plate, and a strut rod having a cross-sectional shape that is difficult to bend in the left-right direction rather than the up-down direction through between the leg pillars of the filler, and the side plate or the intermediate plate facing the intermediate plate A filling structure for underground water tanks, which is built between the two.

4. The basement according to claim 3, wherein a rod receiving portion is formed on an inner surface of the side plate, a rod receiving portion is formed on both surfaces of the intermediate plate, and an end of the projecting bar is fitted into the rod receiving portion. Aquarium filling structure.

The filling of the underground water tank according to claim 2 or 4, wherein the rod receiving portion has a shape with an open upper portion, and an end of a projecting rod is fitted into the rod receiving portion from the opened upper portion. Construction.

2. The underground water tank filling structure according to claim 1, wherein an end portion of the tension rod is fixed to the side plate.

2. The underground water tank filling structure according to claim 1, wherein a presser bar is provided outside the side plate, and the presser bar is fixed to an end of the projecting bar.

The filling structure of the underground water tank according to claim 3, wherein both end portions of a strut rod spanned between the intermediate plate and the side plate are fixed to the intermediate plate and the side plate.

4. The groundwater tank according to claim 3, wherein a presser bar is attached to the outside of the side plate, and the presser bar is fixed to an end portion of a strut bar that is spanned between the intermediate plate and the side plate. Filling structure.