JP3956260B2

JP3956260B2 - Scale adhesion prevention system

Info

Publication number: JP3956260B2
Application number: JP28136198A
Authority: JP
Inventors: 忠高野; 伸一郎尾形; 光男毛利; 雅晴田崎
Original assignee: Shimizu Corp
Current assignee: Shimizu Corp
Priority date: 1998-07-16
Filing date: 1998-10-02
Publication date: 2007-08-08
Anticipated expiration: 2018-10-02
Also published as: JP2000087588A

Description

【０００１】
【発明の属する技術分野】
本発明は、地下タンクにおけるスケール付着防止システムに関する。
【０００２】
【従来の技術】
従来、図７のように石油備蓄等のため地下に大型タンクＡが設置され、このタンクＡにおいては通常地下水対策としてタンクＡの下端隅部に集水槽Ｂが設けられ、この集水槽Ｂに通じる集水管Ｃを地下タンクＡの側壁のパイプスペース内に鉛直に取り付けるようにしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、図６に示すようにＣＯ₂ を含んだ水が地中の石灰石を溶かし、その石灰分（ＣａＣＯ₃ ）の混入した水が集水管Ｃ内に入ると、集水管Ｃの出口即ち集水管の下端部で集水槽Ｂ内の空気に触れて、温度や圧力差によってＣＯ₂ を放出し、水滴中で過飽和になったＣａＣＯ₃ が再結晶し鍾乳石Ｄのように垂れ下がった状態で付着する。そして、滴り落ちてくる水量やＣＯ₂ 量等が関係して結晶が成長し、集水管Ｃを詰まらせることがある。
集水管Ｃが閉塞すると、図示は省略したが壁面内の排水網に水が溜り、高い水圧がライニングに作用すると内方に膨らんでタンクＡ内の浮き屋根の昇降を妨害したり、或は側壁が破損するとタンクＡとしての使用に不都合が生じる。このため、集水槽Ｂの内部の開放点検及び清掃を行う必要があるが、地下深くに位置しているため大掛かりな作業となるばかりか、多大の費用を要するという問題点がある。
【０００４】
本発明は、このような従来の問題点を解消するためになされ、地下タンクにおける集水管の出口付近に鍾乳石が付着しないようにしたスケール付着防止システムを提供し、大掛かりな作業と多大の費用を排除することを目的とする。
【０００５】
【課題を解決するための手段】
この目的を達成するための手段として、本発明は、地下タンクに付設された集水槽において、地下水を集水槽の上部から導入する集水管の出口に鉛直管を接続し、この鉛直管を集水槽の内部に突出させると共にその先端部を斜めに切断し、鉛直管の接続部と集水槽の天板との隙間にシーリング材を充填したスケール付着防止システムを要旨とする。
又、地下タンクに付設された集水槽と地上とを結ぶ汲上管及び送水管と、これらの管の上端部を連通させる接続管と、集水槽内に設置され前記汲上管の下端部と接続された溜まり水吸込用ポンプとで、集水槽内部に溜まった溜まり水の循環経路を構成し、前記送水管の下端部を屈曲して、地下水を集水槽の上部から導入する集水管の出口付近に前記送水管下端部先端のノズルを臨ませることにより溜まり水を吹き付けることを特徴とするスケール付着防止システムを要旨とする。
このスケール付着防システムにおいて、地上に薬液タンクを設置し、この薬液タンクと前記送水管とを接続して送水管を通過する溜まり水にスケールを分解するための薬液を混入すること、
前記接続管の途中に貯溜タンクを設置し、この貯溜タンクに溜まり水を収容し、集水槽との高低差を利用して貯溜タンク内の溜まり水を送水管に供給すること、
前記送水管に噴流ポンプを設けたこと、を特徴とする。
更に、地下タンクに付設された集水槽と地上とを結ぶ汲上管及び送水管と、これらの管の上端部を連通させる接続管と、集水槽内に設置され前記汲上管の下端部と接続された溜まり水吸込用ポンプとで、集水槽内部に溜まった溜まり水の循環経路を構成し、前記送水管の下端部を屈曲し、地下水を集水槽の上部から導入する集水管の出口に鉛直管を接続して集水槽内に突出させると共にその先端部を斜めに切断し、前記鉛直管の接続部と集水槽の天板との隙間にシーリング材を充填し、鉛直管先端部の切断切り口に前記送水管下端部先端のノズルを臨ませることにより溜まり水を吹き付けることを特徴とするスケール付着防止システムを要旨とするものである。
【０００６】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて詳説する。
図１は本発明の実施の一形態を示すもので、１は地下タンクであり、その下端隅部に集水槽２が形成され、この集水槽２の上部には集水管３の下端部が開口している。集水管３は、地下タンク１の側壁に形成されたパイプスペース（図略）内に鉛直に設けられ、地下水を集水槽２に導入する。
【０００７】
４は汲上管、５は送水管であり、どちらも地上と集水槽１とを結ぶようにして前記パイプスペース内に鉛直に配設され、汲上管４の下端部は集水槽１内に設置された吸込用ポンプ６に接続されると共に、地上の上端部は分岐管を介してバルブ４ａが取り付けられている。一方、送水管５の下端部は斜め上向きに屈曲されて先端にノズル５ａが取り付けられ、このノズル５ａは前記集水管３の下端部に臨むように位置付けられ、上端部には噴流ポンプ７が取り付けられている。
【０００８】
８は接続管であり、一方の端部は前記汲上管４の上端部に接続され、他方の端部は前記噴流ポンプ７に接続されることで、汲上管４と送水管５とを連通させてあり、要所にはバルブ８ａが取り付けられている。この接続管８は、汲上管４より管径を小さくして既設のパイプスペースに入るように工夫してある。
又、配管系統が地下タンク１内から一度地上部へ出て、再度地下タンク１内へ入る理由は、今回新たに設置するポンプ、バルブ、計装類を地上に置くためであり、これは器械の故障時にわざわざ地下の集水槽２に入らなくても済むようにするためである（図１〜図３に共通）。
【０００９】
９は地上に設置された薬液タンクであり、スケール（鍾乳石）を分解するための薬液９ａを収容し、連結管１０を介して前記噴流ポンプ７に接続され、その連結管１０の要所にはバルブ１０ａが取り付けられている。薬液９ａは、例えば塩素系、有機酸系、過酸化水素系のものが有効であり、薬液濃度は概ね塩素系の場合で５〜１２％、過酸化水素系の場合で１０〜１５％程度とする。
【００１０】
前記連結管１０には仮想線で示す位置にポンプＰ及び流量計Ｑと圧力計Ｒを設置し、更に前記接続管８には仮想線で示す位置に圧力計Ｒを、送水管５には仮想線で示す位置に流量計Ｑと圧力計Ｒとを設置することが好ましい。
【００１１】
上記のように循環経路Ｋが構成されたスケール付着防止システムにおいて、前記集水槽２内の溜り水１１の一部を吸込用ポンプ６で吸い込み、汲上管４内を通過させて地上まで汲み上げると共に、接続管８を介して送水管５に供給する。送水管５に送り込まれた溜り水は、前記噴流ポンプ７により圧送されて勢い良く流下し、送水管５の下端のノズル５ａから集水管３の出口付近に向けて吹き付けられる。
【００１２】
この時、前記連結管１０のバルブ１０ａを開けば、溜り水が噴流ポンプ７内を通過する際に、薬液タンク９内の薬液９ａが噴流ポンプ７内に吸い込まれて溜り水に混合され、この薬液混合溜り水が前記送水管５のノズル５ａから噴射されることになる。従って、集水管３の出口付近に鍾乳石Ｄが付着するのを未然に防止することができ、少量付着していたとしても前記薬液９ａによって除去することができる。
【００１３】
吹き付けられる溜り水及び薬液の添加量等は、前記汲上管４のバルブ４ａ、接続管８に取り付けたバルブ８ａ、連結管１０のバルブ１０ａを適宜操作することにより調節することができ、更に循環経路Ｋの要所に取り付けられた流量計Ｑ、圧力計Ｒ等の計器類を測定することで適正に調整及び維持することができる。前記ポンプＰは、大量に薬液９ａを添加する場合に作動させる。
【００１４】
図２は、本発明の他の実施形態を示すもので、基本的構成は図１のものと同じであるが、特に接続管８と送水管５との間に貯溜タンク１２を設置した点で相違し、この貯溜タンク１２と集水槽２との高低差を利用し、前記噴流ポンプ７等のポンプ動力を用いないで溜り水を送水管５内に供給する点に特徴を有するものである。
【００１５】
前記貯溜タンク１２の出口と送水管５とは連結管１３を介して接続され、その連結管１３の要所にはバルブ１３ａが取り付けられている。又、送水管５の上部には空気抜き管１４が取り付けられ、更に送水管５の要所にはバルブ５ｂが取り付けられる。
【００１６】
この場合は、吸込用ポンプ６により吸い込まれた集水槽２内の溜り水１１は、汲上管４及び接続管８を経て一旦貯溜タンク１２に収容され、この貯溜タンク１２から送水管５に供給される際に薬液タンク９からの薬液９ａと混合され、送水管５内を自然流下して先端のノズル５ａから集水管３の出口付近に吹き付けられる。従って、集水管３の出口付近に鍾乳石Ｄが付着するのを未然に防止できると共に、付着した鍾乳石Ｄの除去も可能である。尚、貯溜タンク１２には放水管１２ａを設けて、収容した溜り水のレベルを一定に保つことが好ましい。
【００１７】
図３は、本発明の更に他の実施形態を示すもので、貯溜タンク１２を設ける点では図２のものと同じであるが、噴流ポンプ７を組み込んだ点で相違しており、噴流ポンプ７側の連結管１３の要所にポンプＰ′を取り付ける。更に、必要に応じて薬液タンク９側の連結管１０にもポンプＰを取り付ける。
【００１８】
この場合も、吸込用ポンプ６により吸い込まれた集水槽２内の溜り水１１は、汲上管４及び接続管８を経て一旦貯溜タンク１２に収容され、この貯溜タンク１２から噴流ポンプ７及びポンプＰ′により送水管５に供給されると共に薬液タンク９からの薬液９ａと混合され、送水管５内を圧送されて勢い良く流下し、送水管５の下端のノズル５ａから集水管３の出口付近に向けて吹き付けられる。従って、集水管３の出口付近に鍾乳石Ｄが付着するのを未然に防止し、且つ付着した鍾乳石Ｄを除去することができる。
【００１９】
図４(イ) は、集水管３の出口にステンレス製等の鉛直管１５を接続した実施形態を示すもので、この場合鉛直管１５は集水管３と同じ内径の物を用い、集水槽２の内部に突出させると共にその先端部を斜めに切断し、図４(ロ) のように集水管３との接続部１５ａの周囲、特に鉛直管１５と集水槽２の天板２ａとの隙間にシーリング材１６を充填させてある。
【００２０】
石灰分の混入した水が集水管３（通常塩化ビニール製）内を流下し、前記鉛直管１５に至ると、鉛直管１５の内面は滑り易いため流速を速めて短時間で落下し、しかも鉛直管１５の先端部は斜めに切断されて先が尖っているため、その切断切り口１５ｂから速やかに集水槽２内に落下する。従って、石灰分によるスケール形成を防止することができる。
【００２１】
スケールは、始めに集水管３の出口付近及びその周囲の天板２ａ面に形成され、その後徐々につらら状に形成されていくが、前記のように集水管３の出口に鉛直管１５を接続することでつららの基となるスケール形成を防止する効果が得られる。又、前記シーリング材１６によって鉛直管１５の接続部１５ａの外周は密閉されているため、接続部１５ａの隙間から漏れて外周部及びその周囲の天板２ａ面にスケールが形成されることもない。
【００２２】
鉛直管１５は、ステンレス製に限定されることなく内面が滑り易い材質であれば良く、要するに石灰分の混入した水が迅速に流下しその滞留時間を短縮できる材質の物であれば良い。場合によっては、集水管３自体を内面が滑り易い材質で形成し、その先端部を集水槽２内に突出させるようにしても良い。
【００２３】
図５(イ) は、鉛直管接続方式を更に発展させた実施形態を示すもので、前記と同様に鉛直管１５を集水管３の出口に接続し、集水槽２の内部に突出させると共にその先端部を斜めに切断し、図５(ロ) のように集水管３との接続部１５ａの周囲、特に鉛直管１５と集水槽２の天板２ａとの隙間にシーリング材１６を充填し、前記送水管５の屈曲先端部を鉛直管１５の切断切り口１５ｂに臨ませた構成である。
【００２４】
この場合、送水管５のノズル５ａから鉛直管１５の切断切り口１５ｂに溜り水を吹き付け、図５(ロ) のように切断切り口１５ｂの下端部に特に重点的に吹き付けることで、その部分に生じ易いスケールの形成を未然に防止することができる。従って、鉛直管１５による迅速な排出効果と、送水管による洗浄効果との相乗効果によってスケール付着防止が完璧なものとなる。
このように鉛直管と送水管とを組み合わせる構成は、図１〜図３に示す各タイプのシステムにいずれも適用することが可能である。
【００２５】
【発明の効果】
以上説明したように、本発明によれば、地下タンクにおける集水槽内の溜り水を循環経路により循環させ、溜り水（必要に応じて薬液を混入）を集水管の出口付近に吹き付けるようにしたので、鍾乳石の生成を未然に防止することができ、且つ生成した鍾乳石を除去することができる。これにより、従来のような集水槽内部の開放点検及び清掃のための大掛かりな作業と多大の経費を排除し、集水管の閉塞を防止することから地下タンクの機能と安全を確保できる等の優れた効果を奏する。
又、図１〜図３に共通に示したように、ポンプ、バルブ、計装類を全て地上部に設置することにより、故障時にわざわざ地下の集水槽に入らなくても済むので好都合である。
更に、集水管の出口にステンレス製等の鉛直管を接続することで、鍾乳石の基礎となるスケールの付着を未然に防止できる等の効果も奏する。
【図面の簡単な説明】
【図１】本発明の実施の一形態を示す全体構成の説明図。
【図２】本発明の他の実施形態を示す全体構成の説明図。
【図３】本発明の更に他の実施形態を示す全体構成の説明図。
【図４】鉛直管を接続する実施形態を示すもので、(イ) は要部の説明図、(ロ) は(イ) におけるａ部の拡大図。
【図５】鉛直管を接続する他の実施形態を示すもので、(イ) は要部の説明図、(ロ) は(イ) におけるａ部の拡大図。
【図６】集水槽に形成される鍾乳石の生成機構を示す説明図。
【図７】地下タンクに集水槽が設けられた状態を示す概略図。
【符号の説明】
１…地下タンク
２…集水槽
３…集水管
４…汲上管
５…送水管
６…吸込用ポンプ
７…噴流ポンプ
８…接続管
９…薬液タンク
１０…連結管
１１…溜り水
１２…貯溜タンク
１３…連結管
１４…空気抜き管
１５…鉛直管
１６…シーリング材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scale adhesion prevention system in an underground tank.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, a large tank A is installed in the basement for oil storage or the like, and in this tank A, a water collecting tank B is provided at the lower end corner of the tank A as a countermeasure for normal groundwater, and this water collecting tank B is connected. The water collecting pipe C is vertically installed in the pipe space on the side wall of the underground tank A.
[0003]
[Problems to be solved by the invention]
However, as shown in FIG. 6, when the water containing CO ₂ dissolves the limestone in the ground and the water mixed with the lime (CaCO ₃ ) enters the water collecting pipe C, the outlet of the water collecting pipe C, that is, the water collecting pipe. At the lower end of the water, the air in the water collection tank B is touched to release CO _{2 due} to temperature or pressure difference, and the CaCO _{3 that} is supersaturated in the water droplets is recrystallized and adheres like a stalactite D. Then, the amount of water dripping down, the amount of CO _2, etc. may be related to the growth of crystals and clog the water collecting pipe C.
When the water collecting pipe C is closed, although not shown in the drawing, water accumulates in the drainage network in the wall surface, and when high water pressure acts on the lining, it swells inward and prevents the floating roof in the tank A from rising or lowering, or the side wall. If it breaks, it will be inconvenient for use as tank A. For this reason, it is necessary to perform inspection and cleaning of the inside of the water collecting tank B. However, since it is located deep underground, there is a problem that it is not only a large-scale work but also requires a lot of cost.
[0004]
The present invention has been made to solve such a conventional problem, and provides a scale adhesion prevention system that prevents stalactites from adhering to the vicinity of the outlet of a water collecting pipe in an underground tank. The purpose is to eliminate.
[0005]
[Means for Solving the Problems]
As means for achieving this object, the present invention provides a water collecting tank attached to an underground tank, wherein a vertical pipe is connected to the outlet of the water collecting pipe for introducing ground water from the upper part of the water collecting tank, and this vertical pipe is connected to the water collecting tank. The gist of the system is a scale adhesion prevention system that protrudes into the interior of the tube and has its tip cut obliquely and filled with a sealing material in the gap between the connecting portion of the vertical pipe and the top plate of the water collection tank .
In addition, a pumping pipe and a water supply pipe connecting the water collection tank attached to the underground tank and the ground, a connection pipe connecting the upper ends of these pipes, and a lower end of the pumping pipe installed in the water collection tank are connected. The accumulated water suction pump forms a circulation path for the accumulated water accumulated inside the water collection tank, bends the lower end of the water supply pipe, and near the outlet of the water collection pipe that introduces groundwater from the top of the water collection tank. The gist of the scale adhesion prevention system is that the accumulated water is blown by facing the nozzle at the tip of the lower end of the water pipe .
In this scale adhesion prevention system, a chemical tank is installed on the ground, and the chemical liquid for decomposing the scale is mixed into the accumulated water passing through the water pipe by connecting the chemical tank and the water pipe.
A storage tank is installed in the middle of the connection pipe, the stored water is stored in the storage tank, and the stored water in the storage tank is supplied to the water supply pipe using a difference in height from the water collection tank.
The water pipe is provided with a jet pump.
Furthermore, a pumping pipe and a water pipe connecting the water collection tank attached to the underground tank and the ground, a connection pipe connecting the upper ends of these pipes, and a lower end of the pumping pipe installed in the water collection tank. in a stagnant water suction pump constitute a circulation path of the accumulated stagnant water inside collecting water tank, the lower end of the water pipe and the bent lead directly to the outlet of the water collecting pipe for introducing the underground water from the top of the condensing water tank A pipe is connected and protruded into the water collecting tank, and its tip is cut obliquely, a gap between the connecting part of the vertical pipe and the top plate of the water collecting tank is filled with a sealing material, and a cutting cut at the tip of the vertical pipe The gist of the scale adhesion prevention system is that the accumulated water is sprayed by facing the nozzle at the tip of the lower end of the water pipe .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes an underground tank, and a water collecting tank 2 is formed at a lower end corner of the water tank, and a lower end of a water collecting pipe 3 is opened above the water collecting tank 2. is doing. The water collection pipe 3 is provided vertically in a pipe space (not shown) formed on the side wall of the underground tank 1, and introduces groundwater into the water collection tank 2.
[0007]
4 is a pumping pipe, and 5 is a water supply pipe, both of which are arranged vertically in the pipe space so as to connect the ground and the water collecting tank 1, and the lower end of the pumping pipe 4 is installed in the water collecting tank 1. A valve 4a is attached to the upper end of the ground via a branch pipe. On the other hand, the lower end of the water supply pipe 5 is bent obliquely upward, and a nozzle 5a is attached to the tip. The nozzle 5a is positioned so as to face the lower end of the water collecting pipe 3, and a jet pump 7 is attached to the upper end. It has been.
[0008]
8 is a connection pipe, one end is connected to the upper end of the pumping pipe 4 and the other end is connected to the jet pump 7, thereby allowing the pumping pipe 4 and the water supply pipe 5 to communicate with each other. The valve 8a is attached to the important point. The connecting pipe 8 is devised so that the pipe diameter is smaller than that of the pumping pipe 4 and enters an existing pipe space.
The reason why the piping system once goes out of the underground tank 1 to the ground part and enters the underground tank 1 again is to place the pump, valve, and instrumentation newly installed this time on the ground. This is because it is not necessary to bother to enter the underground water collecting tank 2 at the time of failure (common to FIGS. 1 to 3).
[0009]
Reference numeral 9 denotes a chemical tank installed on the ground, which stores a chemical 9a for decomposing the scale (stalactite) and is connected to the jet pump 7 through a connecting pipe 10. A valve 10a is attached. For example, chlorine, organic acid, and hydrogen peroxide are effective as the chemical 9a. The concentration of the chemical is about 5 to 12% in the case of chlorine and about 10 to 15% in the case of hydrogen peroxide. To do.
[0010]
The connecting pipe 10 is provided with a pump P, a flow meter Q and a pressure gauge R at a position indicated by a virtual line. Further, the connecting pipe 8 is provided with a pressure gauge R at a position indicated by a virtual line, and the water supply pipe 5 is virtual. It is preferable to install the flow meter Q and the pressure gauge R at the position indicated by the line.
[0011]
In the scale adhesion prevention system in which the circulation path K is configured as described above, a part of the accumulated water 11 in the water collecting tank 2 is sucked by the suction pump 6 and passed through the pumping pipe 4 and pumped up to the ground. The water supply pipe 5 is supplied via the connection pipe 8. The accumulated water sent into the water supply pipe 5 is pumped by the jet pump 7 and flows down vigorously, and is sprayed from the nozzle 5 a at the lower end of the water supply pipe 5 toward the vicinity of the outlet of the water collection pipe 3.
[0012]
At this time, if the valve 10a of the connecting pipe 10 is opened, when the accumulated water passes through the jet pump 7, the chemical 9a in the chemical tank 9 is sucked into the jet pump 7 and mixed with the accumulated water. The chemical solution mixed water is ejected from the nozzle 5 a of the water supply pipe 5. Therefore, it is possible to prevent the stalactite D from adhering to the vicinity of the outlet of the water collecting pipe 3, and even if a small amount is attached, it can be removed by the chemical solution 9a.
[0013]
The amount of accumulated water and chemicals to be sprayed can be adjusted by appropriately operating the valve 4a of the pumping pipe 4, the valve 8a attached to the connecting pipe 8, and the valve 10a of the connecting pipe 10, and the circulation path. By measuring instruments such as a flow meter Q and a pressure gauge R attached to the key points of K, it can be properly adjusted and maintained. The pump P is operated when a large amount of the chemical 9a is added.
[0014]
FIG. 2 shows another embodiment of the present invention. The basic configuration is the same as that of FIG. 1, but in particular, a storage tank 12 is installed between the connection pipe 8 and the water supply pipe 5. The difference is that the difference between the storage tank 12 and the water collecting tank 2 is utilized, and the stored water is supplied into the water supply pipe 5 without using the pump power of the jet pump 7 or the like.
[0015]
The outlet of the storage tank 12 and the water supply pipe 5 are connected via a connecting pipe 13, and a valve 13 a is attached to the main part of the connecting pipe 13. An air vent pipe 14 is attached to the upper part of the water supply pipe 5, and a valve 5 b is attached to the main part of the water supply pipe 5.
[0016]
In this case, the accumulated water 11 in the water collecting tank 2 sucked in by the suction pump 6 is temporarily stored in the storage tank 12 through the pumping pipe 4 and the connection pipe 8, and is supplied from the storage tank 12 to the water supply pipe 5. At this time, it is mixed with the chemical solution 9a from the chemical solution tank 9, flows down naturally in the water supply pipe 5, and is sprayed from the nozzle 5a at the tip to the vicinity of the outlet of the water collecting pipe 3. Therefore, it is possible to prevent the stalactite D from adhering to the vicinity of the outlet of the water collecting pipe 3 and to remove the attached stalactite D. The storage tank 12 is preferably provided with a water discharge pipe 12a to keep the stored water level constant.
[0017]
FIG. 3 shows still another embodiment of the present invention, which is the same as that of FIG. 2 in that a storage tank 12 is provided, but is different in that a jet pump 7 is incorporated. A pump P ′ is attached to a main point of the connecting pipe 13 on the side. Further, the pump P is attached to the connecting pipe 10 on the chemical liquid tank 9 side as necessary.
[0018]
Also in this case, the accumulated water 11 in the water collecting tank 2 sucked in by the suction pump 6 is once stored in the storage tank 12 through the pumping pipe 4 and the connection pipe 8, and the jet pump 7 and the pump P from the storage tank 12. ′ Is supplied to the water supply pipe 5 and mixed with the chemical liquid 9 a from the chemical liquid tank 9, and is pumped through the water supply pipe 5 to flow down vigorously. From the nozzle 5 a at the lower end of the water supply pipe 5 to the vicinity of the outlet of the water collection pipe 3. It is sprayed toward. Therefore, it is possible to prevent the stalactite D from adhering to the vicinity of the outlet of the water collecting pipe 3 and to remove the adhering stalactite D.
[0019]
FIG. 4 (a) shows an embodiment in which a vertical pipe 15 made of stainless steel or the like is connected to the outlet of the water collection pipe 3. In this case, the vertical pipe 15 uses the same inner diameter as the water collection pipe 3, and the water collection tank 2 As shown in FIG. 4 (b), around the connecting portion 15a with the water collecting pipe 3, especially in the gap between the vertical pipe 15 and the top plate 2a of the water collecting tank 2 as shown in FIG. Sealing material 16 is filled.
[0020]
When lime-mixed water flows down the water collecting pipe 3 (usually made of vinyl chloride) and reaches the vertical pipe 15, the inner surface of the vertical pipe 15 is slippery, so the flow velocity is increased and the water falls down in a short time. Since the tip of the tube 15 is cut obliquely and has a sharp point, the tube 15 quickly falls into the water collection tank 2 from the cut end 15b. Therefore, scale formation due to lime can be prevented.
[0021]
The scale is first formed near the outlet of the water collecting pipe 3 and the top plate 2a around it, and then gradually formed in an icicle shape, but the vertical pipe 15 is connected to the outlet of the water collecting pipe 3 as described above. By doing so, the effect of preventing the formation of scales as the basis of icicles can be obtained. Further, since the outer periphery of the connecting portion 15a of the vertical pipe 15 is sealed by the sealing material 16, it does not leak from the gap of the connecting portion 15a and scale is not formed on the outer peripheral portion and the surrounding top plate 2a surface. .
[0022]
The vertical pipe 15 is not limited to stainless steel and may be made of a material whose inner surface is slippery. In short, the vertical pipe 15 may be made of a material that can quickly flow down lime mixed water and shorten the residence time. In some cases, the water collection pipe 3 itself may be formed of a material whose inner surface is slippery, and the tip portion may protrude into the water collection tank 2.
[0023]
FIG. 5 (a) shows an embodiment in which the vertical pipe connection system is further developed. Similarly to the above, the vertical pipe 15 is connected to the outlet of the water collecting pipe 3 and protrudes into the water collecting tank 2, and its The tip is cut obliquely, and as shown in FIG. 5 (b), the sealing material 16 is filled around the connection portion 15a with the water collecting pipe 3, particularly in the gap between the vertical pipe 15 and the top plate 2a of the water collecting tank 2. The bent tip of the water supply pipe 5 is configured to face the cut end 15 b of the vertical pipe 15.
[0024]
In this case, the accumulated water is sprayed from the nozzle 5a of the water supply pipe 5 to the cut end 15b of the vertical pipe 15, and is particularly focused on the lower end of the cut end 15b as shown in FIG. Easy scale formation can be prevented in advance. Therefore, scale adhesion prevention is perfected by the synergistic effect of the quick discharge effect by the vertical pipe 15 and the cleaning effect by the water pipe.
Thus, the structure which combines a vertical pipe and a water supply pipe can apply all to each type of system shown in FIGS.
[0025]
【The invention's effect】
As described above, according to the present invention, the accumulated water in the water collection tank in the underground tank is circulated by the circulation path, and the accumulated water (mixed with the chemical as necessary) is sprayed near the outlet of the water collection pipe. Therefore, the production of stalactites can be prevented and the produced stalactites can be removed. As a result, it eliminates the large-scale work for opening inspection and cleaning inside the water collection tank and a large amount of expenses as before, and prevents the clogging of the water collection pipe, so that the function and safety of the underground tank can be secured. Has an effect.
Also, as shown in FIGS. 1 to 3 in common, it is advantageous to install all the pumps, valves, and instrumentation on the ground, so that it is not necessary to enter the underground water collection tank at the time of failure.
Furthermore, by connecting a vertical pipe made of stainless steel or the like to the outlet of the water collecting pipe, there is an effect that it is possible to prevent the scale serving as the basis of the stalactite from being attached beforehand.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an overall configuration showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an overall configuration showing another embodiment of the present invention.
FIG. 3 is an explanatory diagram of an overall configuration showing still another embodiment of the present invention.
4A and 4B show an embodiment in which a vertical pipe is connected, in which FIG. 4A is an explanatory view of a main part, and FIG. 4B is an enlarged view of an a part in FIG.
5A and 5B show another embodiment for connecting a vertical pipe, where FIG. 5A is an explanatory view of a main part, and FIG. 5B is an enlarged view of a part a in FIG.
FIG. 6 is an explanatory view showing a mechanism for generating stalactites formed in a water collection tank.
FIG. 7 is a schematic view showing a state in which a water collection tank is provided in an underground tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Underground tank 2 ... Catch tank 3 ... Catch pipe 4 ... Pumping pipe 5 ... Water feed pipe 6 ... Suction pump 7 ... Jet pump 8 ... Connection pipe 9 ... Chemical liquid tank 10 ... Connection pipe 11 ... Reservation water 12 ... Storage tank 13 ... Connecting pipe 14 ... Air venting pipe 15 ... Vertical pipe 16 ... Sealing material

Claims

In the water collection tank attached to the underground tank, a vertical pipe is connected to the outlet of the water collection pipe that introduces groundwater from the top of the water collection tank, and this vertical pipe protrudes into the water collection tank and its tip is cut obliquely. A scale adhesion prevention system characterized in that a sealing material is filled in a gap between a connecting portion of a vertical pipe and a top plate of a water collecting tank .

A pumping pipe and a water supply pipe connecting the water collecting tank attached to the underground tank and the ground, a connecting pipe communicating the upper end of these pipes, and a reservoir installed in the water collecting tank and connected to the lower end of the pumping pipe The water suction pump constitutes a circulation path for the accumulated water accumulated in the water collection tank, the lower end of the water supply pipe is bent, and the water supply pipe is introduced near the outlet of the water collection pipe for introducing groundwater from the upper part of the water collection tank. A scale adhesion prevention system characterized by spraying accumulated water by facing the nozzle at the tip of the lower end of the water pipe .

The scale adhesion prevention system according to claim 2 , wherein a chemical solution tank is installed on the ground, and the chemical solution for decomposing the scale is mixed into the accumulated water that connects the chemical solution tank and the water supply pipe and passes through the water supply pipe.

Established a storage tank in the middle of the connection pipe, the reservoir in the storage tank water to the housing, reservoir water according to claim 2 or 3, wherein supplying the water pipe in the reservoir tank by utilizing the difference in height between the condenser water tank Scale adhesion prevention system.

The water pipe scale deposition preventing system of claims 2 to 4, wherein any one of the jet pump digits set to the upper end portion of.

A pumping pipe and a water supply pipe connecting the water collecting tank attached to the underground tank and the ground, a connecting pipe communicating the upper end of these pipes, and a reservoir installed in the water collecting tank and connected to the lower end of the pumping pipe in the water suction pump constitute a circulation path of the accumulated stagnant water inside collecting water tank, the lower end of the water pipe to bending, the lead straight pipe to the outlet of the water collecting pipe for introducing the underground water from the top of the condensing water tank Connect and protrude into the water collection tank and cut the tip at an angle, fill the gap between the connection part of the vertical pipe and the top plate of the water collection tank, and cut the cut end at the tip of the vertical pipe A scale adhesion prevention system characterized by spraying accumulated water by facing the nozzle at the lower end of the water pipe .