JP2008086997A - Sand pumping apparatus - Google Patents

Sand pumping apparatus Download PDF

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JP2008086997A
JP2008086997A JP2007322471A JP2007322471A JP2008086997A JP 2008086997 A JP2008086997 A JP 2008086997A JP 2007322471 A JP2007322471 A JP 2007322471A JP 2007322471 A JP2007322471 A JP 2007322471A JP 2008086997 A JP2008086997 A JP 2008086997A
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sand
pump
water
basin
nozzles
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JP5179159B2 (en
JP2008086997A5 (en
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Hiroaki Itakura
弘明 板倉
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Asahi Tec Corp
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Asahi Tec Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To efficiently discharge sand from a rainfall sand sedimentation pond. <P>SOLUTION: The sand pumping apparatus that sucks the sand sedimented in the rainfall sand sedimentation pond and the like entrapped in the water by a sucking means such as jet pump and sand pump and transfers the same to a predetermined place, wherein a disturbing means is provided that jets a pressurized water into the sand sedimented in the vicinity of the sucking means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、下水処理施設の雨水沈砂池等に設けられる揚砂装置に関する。   The present invention relates to a sand raising device provided in a rainwater settling basin or the like of a sewage treatment facility.

従来、下水処理施設における雨水ポンプ場の雨水沈砂池には、雨水沈砂池の底面に沈殿した砂を所定の場所まで移送するためのジェットポンプからなる揚砂装置が設けられている。このジェットポンプを用いる揚砂装置におけるジェットポンプの吸引口は雨水沈砂池の底面の最も低い位置に設けられた集砂ピットの上方に位置するように設けられる。したがって、ジェットポンプが駆動されると、集砂ピット内の砂は吸引口から吸引され、所定の移送場所まで配設された配管を介して移送させられる。   Conventionally, a storm water settling basin of a storm water pumping station in a sewage treatment facility has been provided with a sand raising device comprising a jet pump for transferring sand deposited on the bottom surface of the storm water settling basin to a predetermined location. The suction port of the jet pump in the sand pump using this jet pump is provided so as to be located above the sand collecting pit provided at the lowest position on the bottom surface of the rainwater settling basin. Therefore, when the jet pump is driven, the sand in the sand collection pit is sucked from the suction port and transferred through a pipe arranged to a predetermined transfer place.

また、上記ジェットポンプを用いた揚砂装置は、高圧水を駆動源とするために動力費がかさむので、動力費の安価な渦巻羽根式の揚砂ポンプを用いた揚砂装置も存在する。   In addition, since the sand pumping apparatus using the jet pump uses high-pressure water as a driving source, the power cost is high. Therefore, there is a sand pumping apparatus using a spiral blade type sand pump with low power cost.

この揚砂ポンプを用いる揚砂装置においては、揚砂ポンプの吸引口が雨水沈砂池の底の最も低い位置に設けられた集砂ピットの上方に位置して設けられる。したがって、揚砂ポンプが駆動されると、集砂ピット内の砂は吸引口から吸引され、所定の移送場所まで配設された配管を介して移送させられる。
特になし。 In the sand pumping apparatus using this sand pump, the suction port of the sand pump is provided above the sand collecting pit provided at the lowest position of the bottom of the rainwater settling basin. Therefore, when the sand pump is driven, the sand in the sand collection pit is sucked from the suction port and transferred through a pipe arranged to a predetermined transfer place.
nothing special.

しかしながら、上記従来の揚砂装置において、集砂ピット内に砂が存在するにもかかわらず、ジェットポンプ又は揚砂ポンプが駆動を開始しても、砂を十分に吸引することができず、したがって、砂の移動を十分に行うことができないという不都合があった。   However, in the conventional sand raising device, even if sand is present in the sand collecting pit, even if the jet pump or the sand raising pump starts driving, the sand cannot be sufficiently sucked. There was an inconvenience that the sand could not be moved sufficiently.

その原因としては、ジェットポンプ又は揚砂ポンプが駆動を開始したときに、集砂ピットに沈殿堆積している砂によってその吸引口がふさがれて、水も沈砂も吸引できないためである。   This is because when the jet pump or the sand pump is started to drive, the suction port is blocked by the sand that has accumulated in the sand collection pit, and neither water nor sediment can be sucked.

そこで、本発明は、上記欠点を解決するためになされたものであって、その目的は、集砂ピット内の砂を効果的に吸引できるようにした揚砂装置を提供することにある。   Accordingly, the present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide a sand raising device capable of effectively sucking sand in a sand collecting pit.

本発明に係る揚砂装置は、上記目的を達成するために、雨水沈砂池等の沈砂池に沈殿した砂をジェットポンプ又は揚砂ポンプ等の吸引手段で水に同伴させて吸引して所定の場所に移送する揚砂装置において、前記吸引手段の吸引口の近くに沈殿した砂に圧力水を噴射して撹乱する撹乱手段を設けたことを特徴としている。
また、前記撹乱手段は、前記吸引手段の吸引開始前から所定時間、駆動されるものであることを特徴としている。 In order to achieve the above object, the sand lifting apparatus according to the present invention sucks the sand precipitated in a sand basin such as a rainwater settling basin with water by a suction means such as a jet pump or a sand pump, and In the sand lifting device to be transferred to a place, there is provided a disturbing means that jets pressure water to the sand that has settled near the suction port of the suction means to disturb the sand.
Further, the disturbing means is driven for a predetermined time before the suction of the suction means is started.

本発明に係る揚砂装置は、吸引手段の吸引口の近くに沈殿した砂に圧力水を噴射して撹乱する撹乱手段を設けたので、集砂ピット内の砂が撹乱され、砂を水に同伴させて効率よく排出することができる。
また、撹乱手段を吸引手段の吸引開始前から所定時間、駆動されるものとしたときは、運転コストを低減させることができる。 The sand raising device according to the present invention is provided with the disturbing means for injecting the pressure water to the sedimented sand near the suction port of the suction means to disturb the sand in the sand collecting pit, and the sand is turned into water. It can be discharged efficiently by being accompanied.
Further, when the disturbance means is driven for a predetermined time before the suction of the suction means, the operating cost can be reduced.

以下、本発明の実施の形態を図面に基づいて説明する。図１は、本発明の揚砂装置を下水処理施設の雨水沈砂池（以下、「沈砂池」という）に適用したもので、同図（ａ）はその断面図、同図（ｂ）は同図（ａ）の一部平面図、図２は、図１（ｂ）のイ−イ線断面図であり、図１（ａ）は、図１（ｂ）のローロ線断面図に相当している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the sand pumping apparatus of the present invention applied to a rainwater settling basin (hereinafter referred to as “sedimentation basin”) of a sewage treatment facility. FIG. 1 (a) is a sectional view thereof, and FIG. FIG. 2A is a partial plan view of FIG. 1A, FIG. 2 is a cross-sectional view taken along the line II in FIG. 1B, and FIG. 1A corresponds to the cross-sectional view taken along the roll line in FIG. Yes.

沈砂池１は、周知の沈砂池と同様に、沈砂池１の一方から雨水が流入し、砂を沈降分離した雨水は沈砂池１の他方から流出されるように構成されている。図１（ｂ）の平面図を用いてさらに説明すると、図１（ｂ）の上方側から雨水が流入したとすると、砂を沈降分離した雨水は、図１（ｂ）の下方側から流出することとなる。   The settling basin 1 is configured such that rainwater flows from one of the settling basins 1 and the rainwater that has settled and separated from the sand flows out from the other settling basin 1 in the same manner as the known settling basins. Further explanation will be given using the plan view of FIG. 1 (b). If rainwater flows in from the upper side of FIG. 1 (b), the rainwater settled and separated from the sand flows out from the lower side of FIG. 1 (b). It will be.

沈砂池１の底面１ａの形態は、底面１ａのほぼ中央位置に設けられたその底面１ａより一段と低い偏平な底を有する集砂ピット２に、底面１ａ上の砂（図示せず）を寄せ集めることができるように形成されている。すなわち、その底面１ａは、図１（ｂ）のロ−ロ線断面の同図（ａ）に示されるように、雨水の流入方向の中央線が最も低くなるように傾斜が付されており、また、図１（ｂ）のイーイ線断面の図２に示されるように、集砂ピット２の部分が最も低くなるように傾斜が付されている。したがって、底面１ａ上の砂は、その底面１ａ上に図示しないノズルから水を流出させると、図１（ｂ）に矢印で示されるように、集砂ピット２に寄せ集められてくる。   The form of the bottom face 1a of the sand basin 1 is to collect sand (not shown) on the bottom face 1a in a sand collecting pit 2 having a flat bottom that is lower than the bottom face 1a provided at a substantially central position of the bottom face 1a. It is formed so that it can be. That is, the bottom surface 1a is inclined so that the center line in the rainwater inflow direction is the lowest, as shown in FIG. Further, as shown in FIG. 2 of the section taken along the line II in FIG. 1B, the sand collecting pit 2 is inclined so as to be the lowest. Therefore, when water flows out from a nozzle (not shown) on the bottom surface 1a, the sand on the bottom surface 1a is collected in the sand collecting pit 2 as indicated by an arrow in FIG. 1 (b).

揚砂ポンプ１０は、渦巻羽根を有する周知の水中ポンプからなり、下水処理施設で水中汚泥ポンプとして使用されていたものを用いることができる。この揚砂ポンプ１０は、吸引口１１を下向きに、すなわち、吸引口１１が集砂ピット２の底面に向けて、かつ、その底面から所定間隔を保って、吐出管１２及びサポート１３を介して沈砂池１に設けられている。   The sand pump 10 is a known submersible pump having spiral blades, and a pump used as an submersible sludge pump in a sewage treatment facility can be used. The sand pump 10 has the suction port 11 facing downward, that is, the suction port 11 faces the bottom surface of the sand collecting pit 2 and is spaced from the bottom surface via a discharge pipe 12 and a support 13. It is provided in the settling basin 1.

ノズル２０ａ，２０ｂは、揚砂ポンプ１０の吸引口１１と集砂ピット２の底２ａとの間に、吸引口１１を中心にしてほぼ対向するように設けられていて、図示しないポンプからの圧力水が供給管２１ａ，２１ｂを介してそれぞれ供給されるように構成されている。したがって、これらノズル２０ａ，２０ｂから圧力水が噴出されると、揚砂ポンプ１０の吸引口１１付近の砂を撹乱することができる。   The nozzles 20a and 20b are provided between the suction port 11 of the sand pump 10 and the bottom 2a of the sand collecting pit 2 so as to be substantially opposed to each other with the suction port 11 as a center, and pressure from a pump (not shown). Water is supplied through supply pipes 21a and 21b, respectively. Therefore, when pressure water is ejected from these nozzles 20a and 20b, the sand near the suction port 11 of the sand pump 10 can be disturbed.

次に、図３のフローチャートを用いて揚砂ポンプ１０及びノズル２０ａ，２０ｂの制御動作について説明する。なお、図示しないが、揚砂ポンプ１０、ノズル２０ａ，２０ｂへ圧力水を供給する図示しないポンプ、及びそれらノズル２０ａ，２０ｂに圧力水を供給する供給管２１ａ，２１ｂにそれぞれ設けられている弁等は、沈砂池１を統括的に制御するプログラマブルコントローラを中心に形成される図示しない制御器によって駆動制御されるように構成されている。   Next, the control operation of the sand pump 10 and the nozzles 20a and 20b will be described using the flowchart of FIG. Although not shown, a pump (not shown) for supplying pressure water to the sand pump 10, nozzles 20a and 20b, valves provided in supply pipes 21a and 21b for supplying pressure water to the nozzles 20a and 20b, etc. Are configured to be driven and controlled by a controller (not shown) formed around a programmable controller that controls the sand basin 1 in an integrated manner.

今、沈砂池１への雨水の流入が停止され、沈砂池１の底面に沈降堆積した砂を排出する工程が到来したとすると（ステップ１００肯定。以下、ステップを「Ｓ」とする。）、供給管２１ａ，２１ｂに設けられている図示しない弁がそれぞれ開かれてノズル２０ａ，２０ｂから圧力水が噴出されるとともに、図示しない第１のタイマＴ1 のカウントが開始される（Ｓ１０２）。第１のタイマＴ1 のタイムアップ後、揚砂ポンプ１０が駆動されるとともに、第２のタイマＴ2 のカウントが開始される（Ｓ１０４肯定、Ｓ１０６）。   Assume that the inflow of rainwater into the sand basin 1 is stopped and a process of discharging sediment deposited on the bottom surface of the sand basin 1 has arrived (Yes in step 100. Hereinafter, step is referred to as “S”). Valves (not shown) provided in the supply pipes 21a and 21b are opened, pressure water is ejected from the nozzles 20a and 20b, and counting of a first timer T1 (not shown) is started (S102). After the first timer T1 expires, the sand pump 10 is driven and the second timer T2 starts counting (Yes in S104, S106).

ノズル２０ａ，２０ｂから圧力水が噴出されると、揚砂ポンプ１０の吸引口１１付近に堆積していた砂が撹乱され、その撹乱は、集砂ピット２全体に徐々に広がる。したがって、吸引口１１からは、水に同伴されて砂が効率よく吸引されて吐出管１２を介して所定の場所へ移送される。   When pressure water is ejected from the nozzles 20 a and 20 b, sand accumulated near the suction port 11 of the sand pump 10 is disturbed, and the disturbance gradually spreads throughout the sand collection pit 2. Therefore, the sand is efficiently sucked from the suction port 11 by being accompanied by water and transferred to a predetermined place via the discharge pipe 12.

第２のタイマＴ2 のタイムアップ後、例えば、第２のタイマＴ2 が開始してから１分後にノズル２０ａ，２０ｂの弁がそれぞれ閉じられる（Ｓ１０８肯定、Ｓ１１０）。ノズル２０ａ，２０ｂが閉じられてノズル２０ａ，２０ｂからの噴出水がなくなっても、揚砂ポンプ１０の駆動により吸引口１１の付近は流動化しているので、砂は、吸引される水に同伴されて効果的に排出される。   After the time-up of the second timer T2, for example, one minute after the second timer T2 starts, the valves of the nozzles 20a and 20b are closed (Yes in S108, S110). Even if the nozzles 20a and 20b are closed and the water ejected from the nozzles 20a and 20b disappears, the sand is entrained by the sucked water because the vicinity of the suction port 11 is fluidized by driving the sand pump 10. Are effectively discharged.

このように、ノズル２０ａ，２０ｂからの圧力水の噴射は、揚砂ポンプ１０の吸引口１１付近の堆積した砂を破壊して撹乱するだけで足りるので、揚砂ポンプ１０の運転の開始前からの短い時間で足りる。したがって、揚砂ポンプ１０の運転中、常に継続する必要がなく、運転コストを低下させることができる。   As described above, the injection of the pressure water from the nozzles 20a and 20b only needs to destroy and disturb the accumulated sand in the vicinity of the suction port 11 of the sand pump 10, so that before the operation of the sand pump 10 starts. A short time is sufficient. Therefore, it is not always necessary to continue the operation of the sand pump 10 and the operating cost can be reduced.

集砂ピット２からの砂の排出が終了すると（Ｓ１０８肯定）、すなわち、集砂ピット２内に設けられている図示しない水位計が所定の下限の水位を検出すると、揚砂ポンプ１０は駆動停止される（Ｓ１１０）。なお、揚砂ポンプ１０は、駆動を開始してから（Ｓ１０６）、この駆動停止まで（Ｓ１１０）の間、水位計の上限で駆動を再開し、その水位計の下限で駆動を停止するように制御される。   When the sand discharge from the sand collection pit 2 is completed (Yes at S108), that is, when a water level meter (not shown) provided in the sand collection pit 2 detects a predetermined lower limit water level, the sand pump 10 stops driving. (S110). The sand pump 10 restarts driving at the upper limit of the water level meter and stops driving at the lower limit of the water level meter until the driving is stopped (S110) after starting driving (S106). Be controlled.

上述の例では、吸引手段として揚砂ポンプ１０を示したが、ジェットポンプであってもよいことはもちろんである。また、ノズルは２本としたが、１本又は３本以上であってもよい。   In the example described above, the sand pump 10 is shown as the suction means, but it is needless to say that it may be a jet pump. In addition, the number of nozzles is two, but it may be one or three or more.

また、上述の例では、ノズル２０ａ，２０ｂを２個のタイマＴ1 ，Ｔ2 を設けて揚砂ポンプ１０の駆動前後に亘って駆動させたが、タイマを１個とし、揚砂ポンプ１０の駆動開始前の所定時間、駆動させるようにしてもよい。しかし、上述のように、揚砂ポンプ１０の駆動前後に亘ってノズル２０ａ，２０ｂを駆動させるようにすると、揚砂ポンプ１０による流動化とノズル２０ａ，２０ｂによる流動化との相乗効果により、より撹乱作用を高めることができる。   In the above example, the nozzles 20a and 20b are provided with two timers T1 and T2 and driven before and after the sand pump 10 is driven. You may make it drive for the previous predetermined time. However, as described above, when the nozzles 20a and 20b are driven before and after the sand pump 10 is driven, the fluidization by the sand pump 10 and the fluidization by the nozzles 20a and 20b are more effective. Disturbing action can be enhanced.

では、次に、雨水沈砂池及びポンプ井の概略断面図である図４と雨水沈砂池の平面図である図５を用いてさらに詳述する。沈砂池１に連設するポンプ井３０には、ポンプ３１と、それとは別に滞留水ポンプ３２が設けられており、この滞留水ポンプ３２により汲み上げられた雨水等の下水は、集砂ピット２に向けて沈砂池１の底面１ａに堆積した砂を流出させるように圧力水を噴出させる集砂ノズル４０，４１，４２に供給される。   Next, FIG. 4 which is a schematic sectional view of a rainwater settling basin and a pump well and FIG. 5 which is a plan view of the rainwater settling basin will be described in further detail. A pump well 30 connected to the settling basin 1 is provided with a pump 31 and a stagnant water pump 32, and sewage such as rainwater pumped by the stagnant water pump 32 is collected in the sand collecting pit 2. Then, the water is supplied to sand collecting nozzles 40, 41, and 42 for jetting pressure water so that the sand accumulated on the bottom surface 1a of the sand basin 1 flows out.

以下、集砂及び揚砂の手順につき詳述する。   Hereinafter, the procedures for sand collection and sand discharge will be described in detail.

沈砂池１への下水の流入をゲート５０で停止する。   The inflow of sewage into the sand basin 1 is stopped at the gate 50.

次に、沈砂池１の滞留水を滞留水ポンプ３２によって、不図示の汚水沈殿池や流入渠等に排水する。   Next, the stagnant water in the sand basin 1 is drained by a stagnant water pump 32 to a sewage sediment basin, an inflow trough, etc. (not shown).

しかし、ここでの排水には一定の限界がある。なぜなら、沈砂池１は連設部６０を介してポンプ井３０に連設されているため、その連設部６０よりも下方の沈砂池に滞留した水はポンプ３２では排水されない。すなわち、図４を用いて説明すれば、連設部６０の頂レベルであるレベルＬまでポンプ３２で排水した後は、沈砂池１のＬレベル以下の滞留水は排水されない。この状態、すなわち水中下においては、揚砂ポンプによる揚水の移送量が増加し不経済であるばかりか、水圧に打ち勝って沈砂を移動させて集砂しなければならず、ノズルからの圧力水を高圧で噴出させる必要が生じる。高圧集砂は、高圧力を生むためにランニングコストがかかるばかりか、構成機器も多くなる。また、高圧水による下水ミストの発生も衛生的にみて大きな問題であり、集砂効率も水中下に沈砂の一部が舞い上がって浮遊し、その後に再度沈降して堆積するため低下する欠点がある。そこで、これらの問題点を解決するため、ドライ（排水）状態における集砂及び揚砂、さらにはノズルからの圧力水を低圧で噴出させる集砂が望まれる。   However, drainage here has certain limits. This is because the sand basin 1 is connected to the pump well 30 via the connecting portion 60, and the water staying in the sand basin below the connecting portion 60 is not drained by the pump 32. That is, if it demonstrates using FIG. 4, after draining with the pump 32 to the level L which is the top level of the connection part 60, the stagnant water below the L level of the sand basin 1 will not be drained. In this state, that is, underwater, not only is the amount of pumped water transferred by the sand pump increased, which is uneconomical, but it is also necessary to overcome the water pressure and move the sediment to collect the sand. It is necessary to eject at high pressure. High-pressure sand collection not only requires a running cost to generate high pressure, but also increases the number of components. In addition, the generation of sewage mist due to high-pressure water is also a major problem from a hygienic point of view, and the sand collection efficiency also has the disadvantage that a part of the sand sinks and floats underwater, and then sinks and accumulates again. . Therefore, in order to solve these problems, sand collection and pumping sand in a dry (drainage) state, and sand collection that ejects pressure water from a nozzle at a low pressure are desired.

そこでまず、ポンプ３２を停止して、上述のごとく、本発明の揚砂ポンプ１０の吸引口１１の近くに沈殿した砂に圧力水をノズル２０ａ，２０ｂから噴射して一定時間撹乱させた後、揚砂ポンプ１０を稼動させレベルＬ以下の滞留水を排水する。このときのノズル２０ａ，２０ｂには滞留水ポンプ３２によって汲み上げられた水を使用することが好ましい。そして、集砂ピット２内の所定の水位まで排水されたなら揚砂ポンプ１０の稼動を停止させる。ここで、所定の水位とは、沈砂池１内のドライ（排水）状態を実現する水位であって、理想的には吸引口１１のレベルである。しかし、揚砂ポンプ１０の高負荷や高圧での集砂が必要とならない範囲で、若干の雨水の滞留は許され、沈砂池１の流入−流出方向に集砂ピット２を介して延在する中央トラフ１ｂの底部レベルを用いてもよい。例えば、集砂ピット２への開口端部の底部レベルＸとしてもよい。   Therefore, first, the pump 32 is stopped and, as described above, after pressure water is sprayed from the nozzles 20a and 20b to the sand that has settled near the suction port 11 of the sand pump 10 of the present invention and disturbed for a certain period of time, The sand pump 10 is operated and the accumulated water below the level L is drained. It is preferable to use water pumped up by the staying water pump 32 for the nozzles 20a and 20b at this time. And if it drains to the predetermined water level in the sand collection pit 2, the operation of the sand pump 10 is stopped. Here, the predetermined water level is a water level that realizes a dry (drainage) state in the sand basin 1 and is ideally the level of the suction port 11. However, a slight amount of rainwater is allowed to stay within the range where high load or high pressure sand collection of the sand pump 10 is not required, and it extends through the sand collection pit 2 in the inflow-outflow direction of the sand basin 1. The bottom level of the central trough 1b may be used. For example, it is good also as the bottom part level X of the opening edge part to the sand collection pit 2. FIG.

次に、中央トラフ１ｂに堆積した沈砂を集砂ピット２内へ導き、中央トラフ１ｂを洗浄するために中央トラフ１ｂの延在方向に圧力流体を噴出される集砂ノズル４０でスプレーする。中央トラフ１ｂは、集砂ピット２につながる最終的かつ主なトラフであることから、雨水受入れ時の沈砂による埋設を防ぐためである。   Next, the settling sand accumulated in the central trough 1b is guided into the sand collecting pit 2 and sprayed by the sand collecting nozzle 40 from which pressure fluid is ejected in the extending direction of the central trough 1b in order to clean the central trough 1b. The central trough 1b is the final and main trough connected to the sand collecting pit 2, and is therefore intended to prevent burial by sand settling when receiving rainwater.

そして、以降は、中央トラフ１ｂに連通し、かつ直交する複数の小トラフ１ｃ間に設けられた中央トラフ１ｂの延在方向に直交する方向に圧力流体を噴出させる集砂ノズル４１，４１…と、前記集砂ノズル４０，４０を交互に噴出させることによって、小トラフ１ｃ、中央トラフ１ｂを介して集砂ピット２への集砂が行われる。なお、沈砂池はその大きさによっては適宜複数個のエリアに分割され、そのエリアに対応した複数個の集砂ノズル４１，４１…をノズル群としてまとめて、このノズル群単位で圧力水の噴出が集砂ピット２に近い方から順に行われる。   And thereafter, sand collecting nozzles 41, 41,... For ejecting pressure fluid in a direction orthogonal to the extending direction of the central trough 1b provided between the plurality of small troughs 1c orthogonal to the central trough 1b. By alternately ejecting the sand collecting nozzles 40, 40, sand collection to the sand collecting pit 2 is performed via the small trough 1c and the central trough 1b. The sand basin is appropriately divided into a plurality of areas depending on its size, and a plurality of sand collecting nozzles 41, 41,... Are performed in order from the one near the sand collection pit 2.

最後に、集砂ノズル４２，４２によって集砂ピット２付近の沈砂池の池幅方向に堆積した砂を集砂ピット２に集砂し、揚砂ポンプ１０で集砂水とともに不図示の沈砂分離機に送られ揚砂が完了する。   Finally, sand accumulated in the pond width direction of the sand basin near the sand collecting pit 2 is collected in the sand collecting pit 2 by the sand collecting nozzles 42 and 42, and sand collection (not shown) is separated with the sand collecting water by the sand pump 10. It is sent to the machine and sanding is completed.

以上のごとく、本実施の形態では、下水処理施設のポンプ井に連設部を介して連設された雨水沈砂池等の沈砂池の底面に、その連設部よりも下方に集砂ピットを設けるとともに、その集砂ピットに向けてその底面に堆積した砂を流出させるように圧力流体を噴出させるノズルを設け、その集砂ピットに集められた砂をジェットポンプ、揚砂ポンプ等からなる吸引手段で水に同伴させて吸引して所定の場所に移送する揚砂装置であって、前記ノズルの駆動開始前に前記揚砂ポンプを駆動させて前記連設部以下の雨水等の滞留水を排水させる駆動制御手段を設けたものである。そして、前記吸引手段の吸引口近くに砂に圧力水を噴射して撹乱する撹乱手段を設けたものである。   As described above, in the present embodiment, a sand collecting pit is provided below the connected portion on the bottom surface of a sand basin such as a rainwater settling basin connected to the pump well of the sewage treatment facility through the connected portion. In addition to providing a nozzle that ejects the pressure fluid toward the sand collection pit so that the sand accumulated on the bottom flows out, the sand collected in the sand collection pit is sucked by a jet pump, a sand pump, etc. A sand pumping device that sucks the water along with the water and transports it to a predetermined location, and drives the sand pump before starting the nozzle to drive the accumulated water such as rain water below the connected portion. Drive control means for draining is provided. And the disturbance means which jets pressure water to sand and disturbs is provided near the suction opening of the said suction means.

（ａ）は、本発明の一実施の形態に係る揚砂装置を沈砂池に適用したときの断面図、（ｂ）はその平面図である。(A) is sectional drawing when the sand raising apparatus which concerns on one embodiment of this invention is applied to a sand settling basin, (b) is the top view. 図１（ｂ）のイ−イ線断面図である。FIG. 2 is a cross-sectional view taken along the line II in FIG. 制御動作を示すフローチャートである。It is a flowchart which shows control operation. 沈砂池全体の断面図である。It is sectional drawing of the whole sand basin. 図４の左側部分の平面図である。It is a top view of the left side part of FIG.

符号の説明Explanation of symbols

１ 雨水沈砂池（沈砂池）
２ 集砂ピット
２ａ 底
１０ 揚砂ポンプ
１１ 吸引口
１２ 吐出管
２０ａ，２０ｂ ノズル
２１ａ，２１ｂ 供給管 1 rainwater settling basin (sedimentation basin)
2 Sand collection pit 2a Bottom 10 Sand pump 11 Suction port 12 Discharge pipe 20a, 20b Nozzle 21a, 21b Supply pipe

Claims (2)

雨水沈砂池等の沈砂池に沈殿した砂をジェットポンプ又は揚砂ポンプ等の吸引手段で水に同伴させて吸引して所定の場所に移送する揚砂装置において、
前記吸引手段の吸引口の近くに沈殿した砂に圧力水を噴射して撹乱する撹乱手段を設けたことを特徴とする揚砂装置。 In a sand pumping device that sucks sand deposited in a sand basin such as a rainwater sand basin with water by a suction means such as a jet pump or a sand pump, and transfers it to a predetermined place,
A sand raising device, characterized in that there is provided a disturbing means for jetting pressure water to the sedimented sand near the suction port of the suction means to disturb. 撹乱手段は、吸引手段の吸引開始前から所定時間、駆動されるものであることを特徴とする請求項１記載の揚砂装置。   The sanding device according to claim 1, wherein the disturbing means is driven for a predetermined time from the start of suction by the suction means.
JP2007322471A 2007-12-13 2007-12-13 Sand lifting equipment Expired - Lifetime JP5179159B2 (en)

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JP2018099689A (en) * 2018-03-14 2018-06-28 アクアインテック株式会社 Sand collector of sand sedimentation pond
JP2019098266A (en) * 2017-12-05 2019-06-24 株式会社日立製作所 Precipitate removal system and precipitate removal method
JP2019130530A (en) * 2019-04-22 2019-08-08 アクアインテック株式会社 Sand collector of sedimentation basin
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JP2010058044A (en) * 2008-09-03 2010-03-18 Kobelco Eco-Solutions Co Ltd Sand pumping apparatus
JP2011245389A (en) * 2010-05-25 2011-12-08 Aquaintec Corp Method and apparatus for removing sand in settling basin
JP2011245385A (en) * 2010-05-25 2011-12-08 Aquaintec Corp Method and apparatus for removing sand in settling basin
JP2011245387A (en) * 2010-05-25 2011-12-08 Aquaintec Corp Method and apparatus for removing sand in settling basin
JP2011245388A (en) * 2010-05-25 2011-12-08 Aquaintec Corp Sand collecting apparatus for settling basin
JP2012040564A (en) * 2011-11-14 2012-03-01 Aquaintec Corp Sand pumping-up method
JP2012040565A (en) * 2011-11-14 2012-03-01 Aquaintec Corp Sand pumping-up method
JP2013018000A (en) * 2012-10-19 2013-01-31 Aquaintec Corp Sand pumping-up method
JP2015127054A (en) * 2015-02-18 2015-07-09 アクアインテック株式会社 Sand removing device and sand removing method for sand basin
JP2015128773A (en) * 2015-04-17 2015-07-16 アクアインテック株式会社 Sand removing method of settling basin
JP2017177103A (en) * 2017-04-05 2017-10-05 アクアインテック株式会社 Sand collector of sand sedimentation pond
JP2019098266A (en) * 2017-12-05 2019-06-24 株式会社日立製作所 Precipitate removal system and precipitate removal method
JP2018099689A (en) * 2018-03-14 2018-06-28 アクアインテック株式会社 Sand collector of sand sedimentation pond
JP2019130530A (en) * 2019-04-22 2019-08-08 アクアインテック株式会社 Sand collector of sedimentation basin
JP2020108893A (en) * 2019-04-22 2020-07-16 アクアインテック株式会社 Sand collecting device for grit chamber

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