JP2004216562A - Method and apparatus for recovering aggregate of waste concrete in ready-mixed concrete plant - Google Patents

Method and apparatus for recovering aggregate of waste concrete in ready-mixed concrete plant Download PDF

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JP2004216562A
JP2004216562A JP2003003004A JP2003003004A JP2004216562A JP 2004216562 A JP2004216562 A JP 2004216562A JP 2003003004 A JP2003003004 A JP 2003003004A JP 2003003004 A JP2003003004 A JP 2003003004A JP 2004216562 A JP2004216562 A JP 2004216562A
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aggregate
waste concrete
coarse aggregate
concrete
water
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JP4391751B2 (en
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Shusaku Izuta
秀作 伊豆田
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Kitagawa Iron Works Co Ltd
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Kitagawa Iron Works Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the using amount of water used for feeding waste concrete and separating coarse aggregate from waste concrete, in recovering aggregate by separating coarse aggregate and fine aggregate from the waste concrete yielded in a ready-mixed concrete plant or an agitator vehicle. <P>SOLUTION: The waste concrete is directly charged in a coarse aggregate recovery means and separation water is sprinkled over the charged waste concrete not only to separate the coarse aggregate but also to recover the fine aggregate. The waste concrete after the fine aggregate is recovered is fed using separation water as feed water by the inclination of a chute and the fine aggregate is separated and recovered. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、生コンプラントやアジテータ車で発生する廃コンクリートから粗骨材と細骨材を分離回収する骨材回収方法及びその装置に関するものである。
【０００２】
【従来の技術】
生コンプラントでは、生コン出荷後のミキサーやアジテータ車の洗浄に用いた廃水やアジテータ車からの残コンクリートなど（以後これらを廃コンクリートという）が発生する。これらの廃コンクリートは、廃コンクリート内に含まれる骨材（粗骨材と細骨材）を分離させて回収し再利用して、残りのスラッジ水は水処理を施されて廃棄されている。
廃コンクリートからの骨材の分離は特許文献１で示されるように行われていた。図８のフロー図で示すように、アジテータ車１の洗車場２にはアジテータ車１の排出口から排出物を受け取る洗車シュート２０が備えられており、アジテータ車１から排出される現場打設の際に余って持ち帰った残コンクリートやアジテータ車１のドラム内の洗浄水、さらにはプラントに設置されているミキサー内の洗浄水などが洗車シュート２０に投入される。
【０００３】
洗車シュート２０は洗車場２からトロンメル２１の設置位置まで伸びて設けられ、投入された廃コンクリートをトロンメル２１へ搬送するためトロンメル側が低くなる傾斜を付けて備えられており、廃コンクリートに流動性を与えるために送り水給水手段２２を設けて送り水を供給して洗車シュート２０の傾斜を廃コンクリートが流れやすくなるようになされて、廃コンクリートをトロンメル２１へ送っている。
トロンメル２１では送られた廃コンクリートの内、粗骨材のみを分離する粗骨材回収が行なわれる。トロンメル２１は、円筒状の網を備えており、円筒の内側に廃コンクリートが送られ円筒が回転することにより、網目より大きい径の骨材（粗骨材）が円筒内に留まり、他の小径骨材（細骨材）とスラッジ水が円筒外に放出されて、廃コンクリートから粗骨材の分離を行う。
【０００４】
この際、粗骨材に付着したスラッジは網目にかけるだけでは除去することができないので、散水部をトロンメル内に設けて円筒内の粗骨材に分離用水を散水して洗浄し、より確実に粗骨材からスラッジを取り除いて分離させる。
散水されて分離された粗骨材はトロンメル２１から粗骨材ヤード９へ搬送される。トロンメル２１の網の外へ放出された細骨材とスラッジと水（送り水と分離用水）はサイクロンの直下に設けられた排水場へ落とされ、さらに、細骨材を分離する細骨材回収手段として設けられたクラッシュファイア１２に送られて細骨材回収がなされて、廃コンクリートから骨材が分離され、回収される。
【０００５】
前記の方法では、洗車シュート２０での廃コンクリートの搬送時には、廃コンクリートを流しやすくするために搬送用の送り水が供給される。さらに、トロンメル２１で廃コンクリートから粗骨材を分離させる時には、粗骨材に付着したスラッジを取り除くために粗骨材を洗浄する分離用水が供給される。
したがって、それぞれの工程で水の供給が行われるために多量の水が必要となる。このときに用いる水には工業用水などの清水は使用せず、生コンプラントで発生した排水を水処理設備でろ過した水を水槽に蓄え、その上澄水を使用しているので、廃コンクリートを搬送し、粗骨材を分離するために多量の水を使用することから、大容量の水槽と処理量能力の高い水処理設備が必要となり、設備コストや設置スペースなどの問題が発生する。
【０００６】
【特許文献１】
特公昭６２−２７９６５号公報
【０００７】
【発明が解決しようとする課題】
したがって、本発明は、前記問題点を鑑み、生コンプラントで発生する廃コンクリートの骨材回収において、廃コンクリートを搬送し、廃コンクリートから粗骨材を分離させるために用いられる水の使用量を減少させることを目的とする。
【０００８】
【課題を解決するための手段】
上記の課題を解決するため、本発明は、生コンプラントやアジテータ車で発生する廃コンクリートから、粗骨材と細骨材を分離回収する廃コンクリートの骨材回収において、廃コンクリートを直接に粗骨材回収手段へ投入し、投入した廃コンクリートに分離用水を散水することによって粗骨材を分離すると共に粗骨材の回収を行い、粗骨材の回収された後の廃コンクリートが分離用水を送り水としてシュートの傾斜によって搬送され、細骨材の分離を実施する方法、また、廃コンクリートが直接投入されるホッパーと投入された廃コンクリートに分離用水を散水する放水部と分離用水によって分離された粗骨材が回収される回収部を備える粗骨材回収手段と、該粗骨材回収手段の直下に設けられ且つ傾斜を有して備えられて粗骨材の回収された後の廃コンクリートが前記分離用水を送り水として傾斜方向の下側へ搬送されるシュートと、該シュートによって搬送された廃コンクリートから細骨材を分離回収する細骨材回収手段とを備える装置である。
【０００９】
【発明の実施の形態】
以下、本発明の実施例について図を用いて説明する。図１は本発明の第一実施例の平面図を、図２は図１中А−Ａ断面図を示す。
図１、図２において、生コンプラントには、生コンを搬送するアジテータ車１のドラム内を洗浄する洗車場２が設けられている。図１の洗車場２では、３台のアジテータ車１が並列に配置できるようになされており、それぞれのアジテータ車１のドラム内へ洗浄水を供給する洗車ノズルが設けられている。洗車場２の端部には、アジテータ車１から排出される廃コンクリートが直接投入されるホッパー１４を備えた粗骨材回収手段４が配置されている。
【００１０】
粗骨材回収手段４には、コンクリートが直接投入されるホッパー１４と投入された廃コンクリートに分離用水を散水する放水部８と分離用水によって粗骨材１０を分離し回収する回収部１５が備えられている。放水部８として、給水配管から配設された放水ノズルが備えられており、粗骨材回収手段４に投入された廃コンクリートへ向けて分離用水を散水する。回収部１５には、動力源であるモータを備え、両端を回転自在に支持された回転軸１６と回転軸にらせん状に配設したスクリュー羽根１７が備えられている。
回転軸１６は骨材搬送方向が上向きになるように傾斜を有して設けられており、スクリュー羽根１７が回転することで傾斜方向の上側へ粗骨材１０を搬送するようになされている。スクリュー羽根１７の傾斜方向の上側先端には排出口が形成され、この排出口の下に粗骨材ヤード９が設けられている。スクリュー羽根１７の上方には放水部８が配置されており、回収部１５へ投入される廃コンクリートに分離用水を散水する。
図３は回収部１５とシュート１１の部分拡大断面図、図４は図３のＢ矢視断面図を示す。
回収部１５の直下にはホッパー１４と一体に形成されるＵ字桶形状のシュート１１が前記回転軸１６と同様の傾斜を有して備えられており、シュート１１とスクリュー羽根１７との間には隙間ｘが設けられて配置されている。
隙間ｘを通過する細骨材、スラッジ水などの粗骨材１０の回収された後の廃コンクリート１９と分離用水は白矢印、黒矢印で示すようにシュート１１によって傾斜方向の下側へ搬送され、隙間ｘを通過しない粗骨材１０は斜線矢印で示すようにスクリュー羽根１７によって傾斜方向の上側へ分離されて搬送され、粗骨材１０の回収が行われる。
図２、図３において、粗骨材１０の搬送方向を斜線矢印、分離用水の流れを黒矢印、粗骨材１０の回収された後の廃コンクリート１９の搬送方向を白矢印で表している。
シュート１１の傾斜方向の下側端である残量排出口の下には、粗骨材１０の回収された後の廃コンクリート１９から細骨材を分離して回収する細骨材回収手段としてクラッシュファイア１２が設けられ、細骨材とスラッジ水とに分離される。クラッシュファイア１２で分離された細骨材は、クラッシュファイア１２の細骨材搬出口の直下に設けられた細骨材ヤード１８へ搬送され蓄えられて、細骨材の回収が行われる。細骨材が取り除かれたスラッジ水は配管を介してスラッジ水槽へ送られる。
【００１１】
以下に第一実施例を工程に従って説明する。
洗車場２でドラム内を洗浄したアジテータ車１から排出される廃コンクリートは、まず直接に粗骨材回収手段４のホッパー１４へ投入される。
ホッパー１４に投入された廃コンクリートは回収部１５のスクリュー羽根１７の回転により撹拌され傾斜方向の上側へ搬送される。この際、スクリュー羽根１７とその直下に設けられたシュート１１との間には、隙間ｘ（図３中のｘ）が設けてあり、この隙間ｘを通過しない粒径の大きな粗骨材１０のみが分離され、スクリュー羽根１７により粗骨材１０のみが搬送されて粗骨材の回収が行われる。粗骨材１０は、放水部８によってスクリュー羽根１７の上方から散水される分離用水によって洗われ分離されると共に、さらにスクリュー羽根１７で撹拌されながら付着したスラッジを洗い流されて、粗骨材１０の分離が確実に行なわれる。
【００１２】
前記での粗骨材の回収の際に粗骨材１０の分離に用いた分離用水は、図２、３中の黒矢印で示すように細骨材やスラッジ水などの粗骨材１０の回収された後の廃コンクリート１９と同様に、スクリュー羽根１７とシュート１１との間に設けた隙間ｘを通過して、シュート１１の傾斜方向の下側へ流れるので、前記分離用水は粗骨材１０の回収された後の廃コンクリート１９に加えられて粗骨材１０の回収された後の廃コンクリート１９の流動性を増加させ、しかも、重量が大きく流れにくい粗骨材１０が混在しないため、粗骨材１０の回収された後の廃コンクリート１９がシュート１１の傾斜を流れやすくするための送り水として十分作用する。
そのため、シュート１１には新たに送り水を供給する必要なく粗骨材１０の回収された後の廃コンクリート１９はシュート１１での流動性を得ることができ、分離用水を送り水として用いることで、粗骨材１０の分離と、粗骨材１０の回収された後の廃コンクリート１９の搬送を少量の水で行なうことができる。
シュート１１にて下方へ流された、粗骨材１０の回収された後の廃コンクリート１９は、シュート１１の排出部に設けられるクラッシュファイア１２へ投入される。クラッシュファイア１２では従来と同様に投入された粗骨材１０の回収された後の廃コンクリート１９の細骨材が底面に沈降し、底面から上方へ設けられたスクリューコンベアによって細骨材ヤード１８へ搬送されて細骨材の回収が行われる。
クラッシュファイア１２で、粗骨材１０の回収された後の廃コンクリート１９から細骨材を分離され回収されたスラッジ水は排水口より、配管を介してスラッジ水槽へ流入される。
以上の工程により、廃コンクリートから粗骨材と細骨材を分離し回収して各ヤードへ蓄えて、骨材の再利用を行なう。
【００１３】
本発明は、廃コンクリートの骨材回収において、廃コンクリートを直接に粗骨材回収手段４へ投入し、投入した廃コンクリートに分離用水を散水することによって粗骨材を分離すると共に粗骨材の回収を行い、粗骨材の回収された後の廃コンクリート１９が分離用水を送り水としてシュート１１の傾斜によって搬送される。
したがって、シュート１１で搬送される粗骨材の回収された後の廃コンクリート１９は、廃コンクリートの内で重量の最も大きい粗骨材１０が分離され回収されているので、重量が軽減され流され易くなされている。そのため、送り水の量が少量でも粗骨材の回収された後の廃コンクリート１９を流すことができ、シュート１１の傾斜も小さくすることができる。
また、粗骨材１０の分離時に散水した分離用水をそのままシュート１１での送り水として粗骨材１０の回収された後の廃コンクリート１９の搬送に用いるので、廃コンクリートからの骨材の分離と粗骨材の回収された後の廃コンクリート１９の搬送に用いる総水量を減らすことができる。
【００１４】
本実施例では放水部８は、アジテータ車１から直接投入される廃コンクリートの投入位置付近に設けられ、分離用水による粗骨材１０の分離を集中して行うことができる。
図２の３ヵ所設けられた放水部８ａ、８ｂ、８ｃにおいては、放水部８ｃの位置へ廃コンクリートを投入すると、スクリュー羽根１７による粗骨材の分離をより長時間行うことができ、さらに放水部８ａ、８ｂからの分離用水の散水を受けることで洗浄による分離が多く行われ、より確実な粗骨材の分離を行うことができる。
さらに、図２に示すように放水部８ａをシュート１１の傾斜方向の上側に設けると、シュート１１の全体で粗骨材１０の回収された後の廃コンクリート１９の流動性を高めさせて、分離用水をより有効に送り水として作用させることができる。
また、シュート１１は、Ｕ字樋形状に限らず半円筒形状などの流動時に残留しにくい角部のない形状が望ましい。
【００１５】
本実施例では分離される粗骨材の大きさはスクリュー羽根１７とシュート１との間に設けた隙間ｘの間隔により決定される。そのため、回収される粗骨材１０の大きさを変更できるようにシュート１１の設置部位にはシュート１１の設置高さを変更するためのジャッキ２４が備えられて、ジャッキ２４を昇降させることで、シュート１１の設置高さを変更して、スクリュー羽根１７とシュート１０との隙間ｘの間隔が変わる。
これにより、任意の大きさの粗骨材１０を分離する事が可能となり、コンクリートの配合によって変更される粗骨材１０の大きさに対応して分離を行うことができる。
【００１６】
このように本実施例では、シュート１１を移動させて隙間の間隔を変更しているが、スクリュー羽根１７を備える回転軸１６を上下方向に移動しても、隙間ｘの間隔を変更でき、同様の効果を得ることができる。
また、シュート１１や回転軸１６を上下に移動させる機構もジャッキ２４に限らず、伸縮機構を備える機器や高さ調整機構を備えた架台にシュート１１や回転軸１６を据え付ける構造でもよい。
本実施例では、粗骨材１０の分離をスクリュー羽根１７とシュート１１との間の隙間ｘによって行うので、粗骨材１０の分離と同時に粗骨材１０の回収された後の廃コンクリート１９の搬送を行うことができ、粗骨材１０の分離と廃コンクリートの搬送を素早く短時間で行うことができる。
【００１７】
また、本発明の前記実施例では、粗骨材分離手段４のひとつであるスクリュー羽根１７とシュート１１との間に隙間ｘを設けて粗骨材１０の分離を行っているが、他の実施例としては、図６で示すようにスクリュー羽根１７とシュート１１との間に隙間を設けず、スクリュー羽根１７自体に空間部２３を備え、該空間部２３から粗骨材１０の回収された後の廃コンクリート１９をシュート１１へ流下させて、粗骨材１０のみを分離し、搬送させて粗骨材１０の回収を行う。
図５（ａ）にはらせん板のスクリュー羽根、図５（ｂ）にはらせん状に配置した棒材によるスクリュー羽根の側面図を示す。
図５（ｂ）と図６（ａ）に示す実施例は、棒材を回転軸１６へらせん状に配置し、隣接する棒材との間隔を設けて空間部２３とし、空間部２３以上の大きさの粗骨材１０を搬送し、空間部２３を通過する粗骨材１０の回収された後の廃コンクリート１９はシュート１１へ流される。この実施例では、スクリュー羽根１７の全面で粗骨材１０の分離を行うので、多量の廃コンクリートから素早く短時間に粗骨材１０を分離することができる。
図６（ｂ）で示す実施例は、らせん板のスクリュー羽根１７に空間部２３として丸穴をスクリュー羽根１７の全面に開口しており、この実施例では前記同様スクリュー羽根１７の全面で粗骨材１０の分離を行い、さらに粗骨材１０の分離のために投入される分離用水をすぐに流下させないことで、粗骨材１０の洗浄による分離を充分に行い、確実な粗骨材の分離を行うことができる。
またこの例は、図６（ｃ）で示すようにらせん板のスクリュー羽根１７に空間部２３として多角形穴を設けても同様の効果を得る事ができる。
【００１８】
第一実施例では、回収部１５がスクリュー羽根１７を用いる例を記載しているが、第二実施例としては、回収部１５がふるい６を備えて、ふるい６の網目によって粗骨材１０の分離を行う例である。
図７に示すように、廃コンクリートが直接投入される粗骨材回収手段４の回収部１５として振動ふるい機５を用いる。振動ふるい機５は、網目を有するふるい６とふるい６を振動させるバイブロモータ７を備えており、ホッパー１４に直接に投入される廃コンクリートはふるい６の上面へ堆積され、ふるい６がバイブロモータ７により振動されることで、互いに混ざり合っていた粗骨材１０や細骨材などがほぐされる。廃コンクリートの内、ふるい６の網目の間隔より大きい粗骨材１０は網目を通過できずにふるい６の上面に残り、ふるい６の網目の間隔より小さい細骨材やスラッジ水はふるい６の網目を通過して下に落下する。したがって、回収部１５はふるい６の網目によって廃コンクリートから粗骨材１０を分離させる。
【００１９】
ふるい６の上面に残された粗骨材１０は、放水部８から散水される分離用水により、粗骨材１０の表面に付着したスラッジをさらに分離されて、振動によりふるい６が振動フィーダとして作用し、一定方向に搬送される。
搬送された粗骨材１０は、ふるい６の搬送側端部の直下に設けられた粗骨材ヤード９へ蓄えられ、回収される。
ふるい６の下方には、ふるい６から落下する細骨材やスラッジ水などの粗骨材の回収された後の廃コンクリート１９を受けるシュート１１が傾斜を有して設けられている。
第一実施例と同様にシュート１１により、粗骨材１０の回収された後の廃コンクリート１９は分離用水を送り水として用いて傾斜方向の下側へ搬送されて、細骨材を分離する細骨材回収工程へ送られる。
分離する粗骨材１０の大きさの変更は、網目の大きさの異なるふるい６と交換を行うことで可能となる。
【００２０】
本実施例では、粗骨材１０の分離と回収をふるい６を用いて行うので、簡単な構造の装置で粗骨材１０の分離と回収を行うことができる。
ふるい６を用いた他の実施例としては、ふるい６を振動させるバイブロモータ７を用いずに粗骨材１０の分離と回収を行う。ふるい６の網を粗骨材１０が転がる角度、例えば傾斜角５０°以上に傾斜させて設け、ふるい６へ廃コンクリートを投入すると、ふるい６の網により分離された粗骨材は傾斜したふるい６上を転がり傾斜方向の下側へ搬送され、粗骨材１０の回収された後の廃コンクリート１９はふるい６を通過して落下する。
これにより、バイブロモータ７等の動力を用いることなく、粗骨材１０の分離と回収を行うことができる。
【００２１】
【発明の効果】
本発明は、粗骨材１０の回収された後の廃コンクリート１９が分離用水を送り水としてシュート１１の傾斜によって搬送されるので、分離用水を送り水として再利用することで少量の水で廃コンクリートからの骨材回収を行うことができる。
また、最初に粗骨材の分離を行い、その後粗骨材の回収された後の廃コンクリート１９をシュート１１で搬送するため、送り水は粗骨材を取り除いた重量が軽減された粗骨材の回収された後の廃コンクリート１９を搬送するので、搬送に使用する水量をさらに少なくすることができる。
そのため、大量に水処理を行う必要が無くなり、水処理設備の運転コストや設置スペースを軽減できる。
請求項３、４によると、粗骨材回収手段４が回収部１５にスクリュー羽根１７を備え、隙間ｘや空間部２３を設けることにより、粗骨材の回収を行いながら同時に粗骨材の回収された後の廃コンクリート１９を搬送することができ、廃コンクリートからの骨材の回収が短時間に省スペースで行える。
【図面の簡単な説明】
【図１】本発明の第一実施例の平面図。
【図２】図１のＡ−Ａ矢視側面図。
【図３】回収部１５とシュート１１の部分拡大断面図。
【図４】図３のＢ矢視断面図。
【図５】実施例のスクリュー羽根の側面図。
【図６】実施例のスクリュー羽根の正面図。
【図７】第二実施例の平面図。
【図８】従来の骨材回収方法を示すフロー図。
【符号の説明】
４ 粗骨材回収手段
８ 放水部
１１ シュート
１３ 細骨材回収手段
１４ ホッパー
１５ 回収部[0001]
[Industrial application fields]
The present invention relates to an aggregate recovery method and apparatus for separating and recovering coarse aggregate and fine aggregate from waste concrete generated in a raw concrete plant or an agitator vehicle.
[0002]
[Prior art]
In the ready-mixed plant, waste water used for cleaning the mixer and agitator car after shipping the ready-mixed container, residual concrete from the agitator car, and the like (hereinafter referred to as waste concrete) are generated. In these waste concretes, aggregates (coarse aggregates and fine aggregates) contained in the waste concrete are separated and recovered and reused, and the remaining sludge water is subjected to water treatment and discarded.
Separation of aggregates from waste concrete has been performed as shown in Patent Document 1. As shown in the flowchart of FIG. 8, the car wash yard 2 of the agitator car 1 is provided with a car wash chute 20 that receives the discharge from the discharge port of the agitator car 1, Residual concrete brought back excessively, washing water in the drum of the agitator car 1, and further washing water in a mixer installed in the plant are put into the car washing chute 20.
[0003]
The car wash chute 20 extends from the car wash yard 2 to the installation position of the trommel 21 and is provided with an inclination that lowers the trommel side in order to transport the thrown-in waste concrete to the trommel 21, so that the waste concrete has fluidity. In order to supply, the feed water supply means 22 is provided to feed the feed water so that the waste concrete flows easily through the inclination of the car wash chute 20, and the waste concrete is sent to the trommel 21.
In the trommel 21, coarse aggregate recovery is performed to separate only the coarse aggregate from the sent waste concrete. The trommel 21 is provided with a cylindrical mesh. When the waste concrete is sent to the inside of the cylinder and the cylinder rotates, the aggregate (coarse aggregate) having a diameter larger than the mesh remains in the cylinder, and other small diameters. Aggregate (fine aggregate) and sludge water are discharged out of the cylinder to separate coarse aggregate from waste concrete.
[0004]
At this time, the sludge adhering to the coarse aggregate cannot be removed simply by applying it to the mesh, so a watering part is provided in the trommel and the coarse aggregate in the cylinder is sprinkled with water for cleaning to ensure more certainty. Sludge is removed from the coarse aggregate and separated.
The coarse aggregate sprinkled and separated is conveyed from the trommel 21 to the coarse aggregate yard 9. Fine aggregate, sludge, and water (feed water and separation water) released outside the trommel 21 net are dropped into a drainage site located directly under the cyclone, and the fine aggregate is separated to separate the fine aggregate. It is sent to the crash fire 12 provided as a means to collect the fine aggregate, and the aggregate is separated from the waste concrete and collected.
[0005]
In the method described above, when transporting the waste concrete with the car wash chute 20, feed water for transport is supplied to facilitate the flow of the waste concrete. Further, when separating the coarse aggregate from the waste concrete with the trommel 21, water for separation is supplied for washing the coarse aggregate in order to remove sludge adhering to the coarse aggregate.
Therefore, a large amount of water is required because water is supplied in each step. The water used at this time is not industrial water or other clean water, but the wastewater generated at the raw plant is stored in a water tank and stored in the water tank. However, since a large amount of water is used to separate the coarse aggregate, a large-capacity water tank and a water treatment facility with a high treatment capacity are required, which causes problems such as equipment cost and installation space.
[0006]
[Patent Document 1]
Japanese Examined Patent Publication No. 62-27965 [0007]
[Problems to be solved by the invention]
Therefore, in view of the above problems, the present invention reduces the amount of water used for transporting waste concrete and separating coarse aggregate from waste concrete in aggregate recovery of waste concrete generated in a raw concrete plant. The purpose is to let you.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is directed to recovering the aggregate of waste concrete, in which the coarse aggregate and the fine aggregate are separated and recovered from the waste concrete generated in the raw concrete plant or the agitator vehicle. The aggregate is collected and sprinkled with separation water on the input waste concrete to separate the coarse aggregate and collect the coarse aggregate. After the coarse aggregate is recovered, the waste concrete sends the separation water. A method of separating fine aggregates by being transported as water by the inclination of the chute, and a hopper into which the waste concrete is directly fed, and a water discharge part for spraying the separation water to the thrown-in concrete and the separation water. Coarse aggregate recovery means having a recovery unit for recovering the coarse aggregate, and provided with an inclination and provided with an inclination to recover the coarse aggregate A device comprising a chute in which the later waste concrete is conveyed to the lower side in the inclined direction using the separation water as feed water, and a fine aggregate collecting means for separating and collecting the fine aggregate from the waste concrete conveyed by the chute is there.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the first embodiment of the present invention, and FIG. 2 is a sectional view taken on line A-A in FIG.
1 and 2, the raw plant is provided with a car wash station 2 for cleaning the inside of the drum of the agitator car 1 that transports the raw concrete. In the car wash place 2 of FIG. 1, three agitator cars 1 can be arranged in parallel, and car wash nozzles for supplying wash water into the drums of the respective agitator cars 1 are provided. Arranged at the end of the car wash 2 is a coarse aggregate collecting means 4 having a hopper 14 into which waste concrete discharged from the agitator car 1 is directly put.
[0010]
The coarse aggregate recovery means 4 includes a hopper 14 into which concrete is directly input, a water discharge unit 8 for spraying separation water to the input waste concrete, and a recovery unit 15 for separating and recovering the coarse aggregate 10 with the separation water. It has been. The water discharge unit 8 is provided with a water discharge nozzle disposed from a water supply pipe, and sprays separation water toward the waste concrete put into the coarse aggregate recovery means 4. The recovery unit 15 includes a motor serving as a power source, and includes a rotating shaft 16 that is rotatably supported at both ends and a screw blade 17 that is spirally disposed on the rotating shaft.
The rotary shaft 16 is provided with an inclination so that the aggregate conveying direction is upward, and the coarse aggregate 10 is conveyed upward in the inclined direction by the rotation of the screw blade 17. A discharge port is formed at the upper end of the screw blade 17 in the inclined direction, and a coarse aggregate yard 9 is provided below the discharge port. A water discharge unit 8 is disposed above the screw blades 17, and water for separation is sprinkled on the waste concrete thrown into the recovery unit 15.
3 is a partially enlarged cross-sectional view of the collection unit 15 and the chute 11, and FIG. 4 is a cross-sectional view taken along arrow B in FIG.
A U-shaped chute 11 formed integrally with the hopper 14 is provided directly below the collection unit 15 with the same inclination as the rotary shaft 16, and between the chute 11 and the screw blade 17. Are arranged with a gap x.
Waste concrete 19 and separation water after the collection of coarse aggregate 10 such as fine aggregate and sludge water passing through the gap x are conveyed downward in the inclined direction by the chute 11 as indicated by white arrows and black arrows. The coarse aggregate 10 that does not pass through the gap x is separated and conveyed to the upper side in the inclined direction by the screw blades 17 as indicated by the hatched arrows, and the coarse aggregate 10 is collected.
2 and 3, the conveying direction of the coarse aggregate 10 is indicated by diagonal arrows, the flow of separation water is indicated by black arrows, and the conveying direction of the waste concrete 19 after the coarse aggregate 10 is collected is indicated by white arrows.
Crash as a fine aggregate recovery means for separating and recovering fine aggregate from the waste concrete 19 after the coarse aggregate 10 has been recovered, below the remaining amount discharge port, which is the lower end of the chute 11 in the inclined direction. A fire 12 is provided and separated into fine aggregate and sludge water. The fine aggregate separated by the crash fire 12 is transported to and stored in a fine aggregate yard 18 provided immediately below the fine aggregate carry-out port of the crash fire 12, and the fine aggregate is collected. The sludge water from which the fine aggregate has been removed is sent to a sludge water tank through a pipe.
[0011]
The first embodiment will be described below according to the steps.
Waste concrete discharged from the agitator car 1 whose interior has been cleaned in the car wash station 2 is first directly put into the hopper 14 of the coarse aggregate recovery means 4.
The waste concrete thrown into the hopper 14 is agitated by the rotation of the screw blades 17 of the recovery unit 15 and conveyed to the upper side in the inclined direction. At this time, a gap x (x in FIG. 3) is provided between the screw blade 17 and the chute 11 provided immediately below, and only the coarse aggregate 10 having a large particle diameter that does not pass through the gap x. Are separated, and only the coarse aggregate 10 is conveyed by the screw blades 17 and the coarse aggregate is recovered. The coarse aggregate 10 is washed and separated by the water for separation that is sprinkled from above the screw blades 17 by the water discharger 8, and the adhering sludge is washed away while being stirred by the screw blades 17. Separation is ensured.
[0012]
The separation water used for separating the coarse aggregate 10 at the time of the recovery of the coarse aggregate is the recovery of the coarse aggregate 10 such as fine aggregate and sludge water as indicated by the black arrows in FIGS. Like the waste concrete 19 after being passed, it passes through the gap x provided between the screw blade 17 and the chute 11 and flows downward in the inclination direction of the chute 11, so that the separation water is the coarse aggregate 10. Is added to the waste concrete 19 after being collected to increase the fluidity of the waste concrete 19 after the coarse aggregate 10 is collected, and the coarse aggregate 10 which is heavy and difficult to flow is not mixed. The waste concrete 19 after the aggregate 10 has been collected functions sufficiently as feed water for facilitating the flow of the chute 11.
Therefore, the waste concrete 19 after the recovery of the coarse aggregate 10 can obtain fluidity in the chute 11 without needing to supply new feed water to the chute 11, and the separation water can be used as the feed water. The separation of the coarse aggregate 10 and the conveyance of the waste concrete 19 after the coarse aggregate 10 is recovered can be performed with a small amount of water.
Waste concrete 19 after the coarse aggregate 10 has been collected, which has been flowed downward by the chute 11, is thrown into a crash fire 12 provided at the discharge portion of the chute 11. In the crash fire 12, the fine aggregate of the waste concrete 19 after the coarse aggregate 10 that has been input is collected settles down to the bottom surface in the same manner as in the past, and is moved to the fine aggregate yard 18 by a screw conveyor provided upward from the bottom surface. The fine aggregate is collected after being conveyed.
The sludge water collected by separating the fine aggregate from the waste concrete 19 after the coarse aggregate 10 has been collected by the crash fire 12 flows into the sludge water tank through the pipe from the drain port.
Through the above steps, coarse aggregate and fine aggregate are separated from waste concrete, collected, stored in each yard, and the aggregate is reused.
[0013]
In the aggregate recovery of waste concrete, the present invention separates the coarse aggregate by directly throwing the waste concrete into the coarse aggregate recovery means 4 and sprinkling water for separation into the input waste concrete. The waste concrete 19 after collecting and collecting the coarse aggregate is conveyed by the inclination of the chute 11 using separation water as feed water.
Therefore, since the coarse aggregate 10 having the largest weight in the waste concrete is separated and collected, the waste concrete 19 after the coarse aggregate transported by the chute 11 is collected and reduced. It is made easy. Therefore, even if the amount of feed water is small, the waste concrete 19 after the coarse aggregate is collected can be flowed, and the inclination of the chute 11 can be reduced.
Moreover, since the separation water sprinkled during the separation of the coarse aggregate 10 is used as it is as feed water for the chute 11 for transporting the waste concrete 19 after the coarse aggregate 10 is recovered, the separation of the aggregate from the waste concrete and The total amount of water used for transporting the waste concrete 19 after the coarse aggregate has been collected can be reduced.
[0014]
In this embodiment, the water discharger 8 is provided in the vicinity of the input position of the waste concrete that is directly input from the agitator vehicle 1, and the separation of the coarse aggregate 10 by the separation water can be performed in a concentrated manner.
In the water discharge parts 8a, 8b and 8c provided in three places in FIG. 2, when the waste concrete is put into the position of the water discharge part 8c, the coarse aggregate can be separated by the screw blades 17 for a longer period of time. By receiving the water for separation from the parts 8a and 8b, the separation by washing is often performed, and the coarse aggregate can be more reliably separated.
Furthermore, as shown in FIG. 2, when the water discharge part 8 a is provided on the upper side in the inclination direction of the chute 11, the fluidity of the waste concrete 19 after the coarse aggregate 10 has been recovered is increased throughout the chute 11, and separated. Water can be made to act more effectively as feed water.
Further, the chute 11 is not limited to the U-shaped ridge shape, and a semi-cylindrical shape or the like that does not easily remain at the time of flow is desirable.
[0015]
In the present embodiment, the size of the coarse aggregate to be separated is determined by the gap x between the screw blade 17 and the chute 1. Therefore, the jack 24 for changing the installation height of the chute 11 is provided in the installation site of the chute 11 so that the size of the coarse aggregate 10 to be collected can be changed, and by raising and lowering the jack 24, The installation height of the chute 11 is changed, and the gap x between the screw blade 17 and the chute 10 is changed.
Thereby, it becomes possible to isolate | separate the coarse aggregate 10 of arbitrary magnitude | sizes, and can isolate | separate according to the magnitude | size of the coarse aggregate 10 changed by the mixing | blending of concrete.
[0016]
As described above, in this embodiment, the distance between the gaps is changed by moving the chute 11, but even if the rotary shaft 16 including the screw blades 17 is moved in the vertical direction, the distance between the gaps x can be changed. The effect of can be obtained.
Further, the mechanism for moving the chute 11 and the rotary shaft 16 up and down is not limited to the jack 24, and a structure in which the chute 11 and the rotary shaft 16 are installed on a device having a telescopic mechanism and a mount having a height adjusting mechanism may be used.
In this embodiment, the coarse aggregate 10 is separated by the gap x between the screw blade 17 and the chute 11, so that the waste concrete 19 after the coarse aggregate 10 is recovered simultaneously with the separation of the coarse aggregate 10. The conveyance can be performed, and the separation of the coarse aggregate 10 and the conveyance of the waste concrete can be performed quickly and in a short time.
[0017]
Moreover, in the said Example of this invention, although the clearance gap x is provided between the screw blade | wing 17 which is one of the coarse aggregate separation means 4, and the chute | shoot 11, the coarse aggregate 10 is isolate | separated, As an example, as shown in FIG. 6, there is no gap between the screw blade 17 and the chute 11, the screw blade 17 itself has a space portion 23, and the coarse aggregate 10 is recovered from the space portion 23. The waste concrete 19 is caused to flow down to the chute 11 so that only the coarse aggregate 10 is separated and transported to collect the coarse aggregate 10.
FIG. 5 (a) shows a screw blade of a spiral plate, and FIG. 5 (b) shows a side view of a screw blade made of a rod arranged in a spiral shape.
5 (b) and FIG. 6 (a), the bar is helically arranged on the rotary shaft 16, and the space part 23 is provided with an interval between the adjacent bar parts. Waste concrete 19 after transporting the coarse aggregate 10 having a size and collecting the coarse aggregate 10 passing through the space 23 is flowed to the chute 11. In this embodiment, since the coarse aggregate 10 is separated on the entire surface of the screw blades 17, the coarse aggregate 10 can be quickly and quickly separated from a large amount of waste concrete.
In the embodiment shown in FIG. 6B, a round hole is opened in the entire surface of the screw blade 17 as a space 23 in the screw blade 17 of the spiral plate. Separation of the coarse aggregate 10 is ensured by sufficiently separating the coarse aggregate 10 by separating the aggregate 10 and preventing the separation water introduced for separating the coarse aggregate 10 from flowing down immediately. It can be performed.
Further, in this example, the same effect can be obtained even when a polygonal hole is provided as the space portion 23 in the screw blade 17 of the spiral plate as shown in FIG.
[0018]
In the first embodiment, the example in which the collection unit 15 uses the screw blades 17 is described. However, in the second example, the collection unit 15 includes the sieve 6, and the coarse aggregate 10 is formed by the mesh of the sieve 6. This is an example of separation.
As shown in FIG. 7, a vibrating sieve 5 is used as the recovery unit 15 of the coarse aggregate recovery means 4 into which waste concrete is directly input. The vibration sieve machine 5 includes a sieve 6 having a mesh and a vibrator motor 7 that vibrates the sieve 6, and the waste concrete directly put into the hopper 14 is deposited on the upper surface of the sieve 6, and the sieve 6 is vibrated motor 7. The coarse aggregate 10 and the fine aggregate that are mixed with each other are loosened. Of the waste concrete, coarse aggregate 10 larger than the mesh interval of the sieve 6 cannot pass through the mesh and remains on the upper surface of the sieve 6, and fine aggregate and sludge water smaller than the mesh interval of the sieve 6 are retained in the mesh of the sieve 6. To pass down and fall down. Therefore, the collection unit 15 separates the coarse aggregate 10 from the waste concrete by the mesh of the sieve 6.
[0019]
The coarse aggregate 10 left on the upper surface of the sieve 6 is further separated from sludge adhering to the surface of the coarse aggregate 10 by the separation water sprinkled from the water discharge section 8, and the sieve 6 acts as a vibration feeder by vibration. And conveyed in a certain direction.
The transported coarse aggregate 10 is stored and recovered in a coarse aggregate yard 9 provided immediately below the transport side end of the sieve 6.
Below the sieve 6, a chute 11 for receiving waste concrete 19 after collecting coarse aggregate such as fine aggregate and sludge water falling from the sieve 6 is provided with an inclination.
As with the first embodiment, the waste concrete 19 after the coarse aggregate 10 has been collected is transported downward in the inclined direction using the separation water as feed water by the chute 11, and is used to separate the fine aggregate. It is sent to the aggregate recovery process.
The size of the coarse aggregate 10 to be separated can be changed by exchanging with a sieve 6 having a different mesh size.
[0020]
In the present embodiment, since the coarse aggregate 10 is separated and collected using the sieve 6, the coarse aggregate 10 can be separated and collected with an apparatus having a simple structure.
As another embodiment using the sieve 6, the coarse aggregate 10 is separated and collected without using the vibrator motor 7 that vibrates the sieve 6. When the mesh of the sieve 6 is provided so as to be inclined at an angle at which the coarse aggregate 10 rolls, for example, an inclination angle of 50 ° or more, and waste concrete is put into the sieve 6, the coarse aggregate separated by the mesh of the sieve 6 is inclined to the sieve 6. Rolled up, conveyed to the lower side in the inclined direction, and the waste concrete 19 after the coarse aggregate 10 has been collected passes through the sieve 6 and falls.
Thereby, the coarse aggregate 10 can be separated and recovered without using the power of the vibrator motor 7 or the like.
[0021]
【The invention's effect】
In the present invention, since the waste concrete 19 after the coarse aggregate 10 is collected is conveyed by the inclination of the chute 11 using separation water as feed water, the separation concrete water is reused as feed water and is discarded with a small amount of water. Aggregate recovery from concrete can be performed.
In addition, the coarse aggregate is first separated, and then the waste concrete 19 after the coarse aggregate is collected is transported by the chute 11, so that the feed water is a coarse aggregate with reduced weight by removing the coarse aggregate. Since the waste concrete 19 after being collected is transported, the amount of water used for transport can be further reduced.
Therefore, it is not necessary to perform water treatment in large quantities, and the operation cost and installation space of the water treatment facility can be reduced.
According to the third and fourth aspects, the coarse aggregate recovery means 4 includes the screw blades 17 in the recovery portion 15 and provides the gap x and the space portion 23, thereby simultaneously recovering the coarse aggregate while collecting the coarse aggregate. The waste concrete 19 after being transported can be transported, and the aggregate can be recovered from the waste concrete in a short time and in a space-saving manner.
[Brief description of the drawings]
FIG. 1 is a plan view of a first embodiment of the present invention.
2 is a side view taken along the line AA in FIG. 1;
FIG. 3 is a partially enlarged cross-sectional view of a collection unit 15 and a chute 11;
4 is a cross-sectional view taken along arrow B in FIG. 3;
FIG. 5 is a side view of the screw blade of the embodiment.
FIG. 6 is a front view of a screw blade according to an embodiment.
FIG. 7 is a plan view of a second embodiment.
FIG. 8 is a flowchart showing a conventional aggregate recovery method.
[Explanation of symbols]
4 Coarse aggregate recovery means 8 Water discharge part 11 Chute 13 Fine aggregate recovery means 14 Hopper 15 Recovery part

Claims (5)

生コンプラントやアジテータ車で発生する廃コンクリートから、粗骨材と細骨材を分離回収する廃コンクリートの骨材回収方法において、廃コンクリートを直接に粗骨材回収手段へ投入し、投入した廃コンクリートに分離用水を散水することによって粗骨材を分離すると共に粗骨材の回収を行い、粗骨材の回収された後の廃コンクリートが分離用水を送り水としてシュートの傾斜によって搬送され、細骨材の分離を実施する生コンプラントにおける廃コンクリートの骨材回収方法。In the aggregate recovery method for waste concrete that separates and collects coarse aggregate and fine aggregate from waste concrete generated in raw concrete plants and agitator vehicles, waste concrete is directly input to the coarse aggregate recovery means The coarse aggregate is separated and sprinkled with water for separation, and the coarse aggregate is collected, and the waste concrete after the coarse aggregate is collected is transported by the slope of the chute using the separation water as feed water, and the fine bone A method for recovering aggregate of waste concrete in a raw concrete plant that separates wood. 生コンプラントやアジテータ車で発生する廃コンクリートから、粗骨材と細骨材を分離回収する廃コンクリートの骨材回収装置において、
前記廃コンクリートが直接投入されるホッパーと投入された廃コンクリートに分離用水を散水する放水部と分離用水によって分離された粗骨材が回収される回収部を備える粗骨材回収手段と、
該粗骨材回収手段の直下に設けられ且つ傾斜を有して備えられて粗骨材の回収された後の廃コンクリートが前記分離用水を送り水として傾斜方向の下側へ搬送されるシュートと、
該シュートによって搬送された廃コンクリートから細骨材を分離回収する細骨材回収手段とを備えることを特徴とする生コンプラントにおける廃コンクリートの骨材回収装置。In aggregate recovery equipment for waste concrete that separates and collects coarse aggregate and fine aggregate from waste concrete generated in raw concrete plants and agitator vehicles,
Coarse aggregate recovery means comprising a hopper into which the waste concrete is directly input, a water discharge part for spraying separation water to the input waste concrete, and a recovery part for recovering the coarse aggregate separated by the separation water;
A chute provided immediately below the coarse aggregate recovery means and provided with an inclination so that the waste concrete after the recovery of the coarse aggregate is conveyed to the lower side in the inclination direction using the separation water as feed water; ,
An aggregate recovery device for waste concrete in a raw concrete plant, comprising fine aggregate recovery means for separating and recovering fine aggregate from waste concrete conveyed by the chute. 前記回収部が、スクリュー羽根を備え、スクリュー羽根とシュートとの間に設けられる隙間によって粗骨材が廃コンクリートから分離されることを特徴とする請求項２記載の生コンプラントにおける廃コンクリートの骨材回収装置。The aggregate of waste concrete in a raw concrete plant according to claim 2, wherein the recovery unit includes screw blades, and the coarse aggregate is separated from the waste concrete by a gap provided between the screw blades and the chute. Recovery device. 前記回収部が、スクリュー羽根を備え、スクリュー羽根に設けられた空間部により粗骨材が廃コンクリートから分離されることを特徴とする請求項２記載の生コンプラントにおける廃コンクリートの骨材回収装置。The aggregate recovery device for waste concrete in a raw concrete plant according to claim 2, wherein the recovery unit includes screw blades, and coarse aggregate is separated from waste concrete by a space provided in the screw blades. 前記回収部が、ふるいを備え、ふるいに設けられる網目により粗骨材が廃コンクリートから分離されることを特徴とする請求項２記載の生コンプラントにおける廃コンクリートの骨材回収装置。The aggregate recovery apparatus for waste concrete in a raw concrete plant according to claim 2, wherein the recovery unit includes a sieve, and coarse aggregate is separated from the waste concrete by a mesh provided in the sieve.
JP2003003004A 2003-01-09 2003-01-09 Waste concrete aggregate recovery method and apparatus in ready-mixed plant Expired - Fee Related JP4391751B2 (en)

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CN113442289A (en) * 2021-07-28 2021-09-28 广西建设职业技术学院 Preparation device and preparation method of construction waste recycled aggregate sound insulation mortar
CN113442289B (en) * 2021-07-28 2022-06-10 广西建设职业技术学院 Preparation device and preparation method of construction waste recycled aggregate sound insulation mortar
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