JP4933969B2 - Equipment and method for reducing the water absorption rate of recycled fine aggregate - Google Patents

Equipment and method for reducing the water absorption rate of recycled fine aggregate Download PDF

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JP4933969B2
JP4933969B2 JP2007177077A JP2007177077A JP4933969B2 JP 4933969 B2 JP4933969 B2 JP 4933969B2 JP 2007177077 A JP2007177077 A JP 2007177077A JP 2007177077 A JP2007177077 A JP 2007177077A JP 4933969 B2 JP4933969 B2 JP 4933969B2
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fine aggregate
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grinding
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JP2009013016A (en
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道生 服部
敬治 篠崎
晴海 権田
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Rasa Industries Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Description

本発明は、コンクリート廃材を破砕して得られた再生骨材のうち、粒径が5mm未満の再生細骨材の吸水率を低減する設備及び方法に関する。   The present invention relates to equipment and a method for reducing the water absorption rate of recycled fine aggregate having a particle size of less than 5 mm among recycled aggregates obtained by crushing concrete waste.

建物の解体や改良・改築に伴い多量に発生する建築廃棄物のうち、コンクリート廃材は約40%を占める。このコンクリート廃材の約50%は道路舗装用路盤材や、埋め戻し材として再利用されているが、残りの50%は廃棄されているのが実状である。   Of the architectural waste generated in large quantities due to the dismantling, improvement and reconstruction of buildings, concrete waste accounts for about 40%. About 50% of this concrete waste is reused as roadbed material for road paving and backfilling, but the remaining 50% is actually discarded.

一方、コンクリートには大量の骨材が使用されるが、砂利、河川砂等の良質な天然骨材は採取が困難となってきており、骨材資源の枯渇問題解消とコンクリート廃材の有効利用の両面から、コンクリート廃材から、骨材を再生・回収し、粗骨材・細骨材として再利用することが検討されている。   On the other hand, a large amount of aggregate is used for concrete, but it is becoming difficult to collect high-quality natural aggregates such as gravel and river sand, which eliminates the problem of depletion of aggregate resources and makes effective use of concrete waste. From both sides, it has been studied to recycle and collect aggregates from waste concrete and reuse them as coarse aggregates and fine aggregates.

コンクリート廃材から骨材を再生・回収するためには、コーンクラッシャ、ジョークラッシャ、ボールミル等の破砕機によってコンクリート廃材を破砕するという方法が従来より試みられている。しかし、この方法では、破砕機内に30分以上滞留させ、摩擦粉砕を行わないと、JISA5021 コンクリート用再生骨材Hに定められる品質規定のうち、最も重要な絶乾密度及び吸水率の基準(絶乾密度2.5kg/L以上、吸水率3.5%以下)を満たすのが困難であった。   In order to regenerate and collect aggregate from waste concrete, a method of crushing waste concrete with a crusher such as a cone crusher, a jaw crusher, or a ball mill has been conventionally attempted. However, in this method, if the material is retained in the crusher for 30 minutes or more and is not subjected to friction crushing, the most important absolute dry density and water absorption standards (absolute absorption) among the quality regulations established for JIS A5021 recycled aggregate H for concrete. It was difficult to satisfy a dry density of 2.5 kg / L or more and a water absorption of 3.5% or less.

これに対して、本願出願人は、特許文献1において、振動式破砕機の破砕媒体の充填率及び組合せを特定の条件とすることにより、絶乾密度及び吸水率の基準を満たす再生骨材を少ない動力で、かつ、確実に製造できる方法を開示した。   On the other hand, the applicant of the present invention, in Patent Document 1, by setting the filling rate and combination of the crushing medium of the vibration type crusher as a specific condition, a recycled aggregate that satisfies the standard of the absolute dry density and the water absorption rate. A method has been disclosed that can be reliably manufactured with less power.

しかし、この方法で得られた再生骨材を精密に評価したところ、粒径が5mm未満の再生細骨材については吸水率の基準を満たさないものがあることがわかった。
特開2006−111523号公報
However, when the regenerated aggregate obtained by this method was evaluated precisely, it was found that some regenerated fine aggregates having a particle size of less than 5 mm did not satisfy the water absorption criteria.
JP 2006-111523 A

本発明が解決しようとする課題は、粒径が5mm未満の再生細骨材の吸水率を低減する設備及び方法を提供することにある。   The problem to be solved by the present invention is to provide a facility and method for reducing the water absorption rate of recycled fine aggregate having a particle size of less than 5 mm.

上記課題を解決するため、本願発明者が研究を行った結果、粒径が5mm未満の再生細骨材を慣性円錐磨砕機を使用して磨砕することによって、その吸水率を低減することができることを知見し、本発明を完成するに至った。   In order to solve the above-mentioned problems, the inventors of the present invention have conducted research. As a result, it is possible to reduce the water absorption rate by grinding a regenerated fine aggregate having a particle size of less than 5 mm using an inertia cone grinder. As a result, the present invention has been completed.

すなわち、本発明の再生細骨材の吸水率を低減する設備は、コンクリート廃材を破砕して得られた再生骨材のうち、粒径が5mm未満の再生細骨材の吸水率を低減する設備であって、前記再生細骨材を磨砕する慣性円錐磨砕機と、この慣性円錐磨砕機から排出された磨砕物を受け入れて、この磨砕物中の再生細骨材とセメント分微粒子とを分級し、再生細骨材を得る分級機とを備え、前記慣性円錐磨砕機が、シェルと、このシェルに設けられた球面座支持体と、この球面座支持体に取り付けられた球面座と、この球面座に支承され、偏心しながら回転駆動される円錐ヘッドと、この円錐ヘッドに取り付けられたマントルと、このマントルに対向してシェルに取り付けられたコーンケーブと、マントルの下方に取り付けられたアンバランスウエイトとを備え、前記円錐ヘッドが球面座上を偏心しながら回転駆動されることにより
、マントルとコーンケーブとの間で再生細骨材を磨砕するものであり、さらに、再生細骨材を慣性円錐磨砕機に投入する前段階で、再生細骨材中の粒径0.6mm以下の微粉を分級して除去する分級機構を備えたことを特徴とするものである
That is, the facility for reducing the water absorption rate of the recycled fine aggregate of the present invention is a facility for reducing the water absorption rate of the recycled fine aggregate having a particle size of less than 5 mm among the recycled aggregates obtained by crushing the concrete waste. An inertia cone grinding machine for grinding the recycled fine aggregate, and accepting the milled product discharged from the inertia cone grinding machine, and classifying the recycled fine aggregate and cement fine particles in the ground product. And a classifier for obtaining recycled fine aggregate, wherein the inertia cone grinder includes a shell, a spherical seat support provided on the shell, a spherical seat attached to the spherical seat support, A conical head supported on a spherical seat and driven to rotate eccentrically, a mantle attached to the conical head, a cone cave attached to the shell opposite to the mantle, and an unbalance attached below the mantle Hue And a preparative, by the conical head is rotated while the eccentric on the spherical seat state, and are not grinding the reproduced fine aggregate between mantle and Konkebu further reproduction fine aggregate It is characterized by having a classification mechanism for classifying and removing fine powder having a particle size of 0.6 mm or less in the regenerated fine aggregate in a stage before being put into the inertia cone grinder .

また、本発明の再生細骨材の吸水率を低減する方法は、コンクリート廃材を破砕して得られた再生骨材のうち、粒径が5mm未満の再生細骨材の吸水率を低減する方法であって、前記再生細骨材を慣性円錐磨砕機によって磨砕する磨砕工程と、前記慣性円錐磨砕機から排出された磨砕物中の再生細骨材とセメント分微粒子とを分級し、再生細骨材を得る分級工程とを含み、前記慣性円錐磨砕機として、シェルと、このシェルに設けられた球面座支持体と、この球面座支持体に取り付けられた球面座と、この球面座に支承され、偏心しながら回転駆動される円錐ヘッドと、この円錐ヘッドに取り付けられたマントルと、このマントルに対向してシェルに取り付けられたコーンケーブと、マントルの下方に取り付けられたアンバランスウエイトとを備え、前記円錐ヘッドが球面座上を偏心しながら回転駆動されることにより、マントルとコーンケーブとの間で再生細骨材を磨砕するものを使用し、前記磨砕工程の前に、再生細骨材中の粒径0.6mm以下の微粉を分級して除去することを特徴とするものであるThe method for reducing the water absorption rate of the recycled fine aggregate according to the present invention is a method for reducing the water absorption rate of the recycled fine aggregate having a particle size of less than 5 mm among the recycled aggregates obtained by crushing the concrete waste. A grinding step of grinding the recycled fine aggregate with an inertia cone grinding machine, and classifying the recycled fine aggregate and cement fine particles in the ground material discharged from the inertia cone grinding machine. A classifying step for obtaining a fine aggregate, and as the inertia cone grinder, a shell, a spherical seat support provided on the shell, a spherical seat attached to the spherical seat support, and a spherical seat A conical head that is supported and rotated eccentrically, a mantle attached to the conical head, a cone cave attached to the shell opposite the mantle, and an unbalanced weight attached below the mantle Wherein said by the conical head is rotated while the eccentric on the spherical seat, using those grinding playback fine aggregate between mantle and Konkebu, prior to about the milling step, reproducing fine The fine powder having a particle size of 0.6 mm or less in the aggregate is classified and removed .

本発明においては、前記分級機で得られた再生細骨材を前記慣性円錐磨砕機に戻す循環ラインを設け、前記磨砕工程及び前記分級工程を繰り返して行うことで、再生細骨材の吸水率を、要求される基準を満たすまで確実に低減することができる。また、前記磨砕工程及び前記分級工程の繰り返しの程度を調整することで、再生細骨材の吸水率等の品質が目的とする品質となるようにコントロールできる。   In the present invention, there is provided a circulation line for returning the regenerated fine aggregate obtained by the classifier to the inertial conical grinder, and the water absorption of the regenerated fine aggregate is performed by repeating the grinding step and the classification step. The rate can be reliably reduced until it meets the required criteria. Further, by adjusting the degree of repetition of the grinding step and the classification step, it is possible to control the quality such as the water absorption rate of the regenerated fine aggregate so as to achieve the desired quality.

また、本発明においては、再生細骨材を慣性円錐磨砕機に投入する前段階で、再生細骨材中の粒径0.6mm以下、好ましくは粒径0.3mm以下の微粉を分級して除去する分級機構を設け、これによって磨砕工程の前に、再生細骨材中の粒径0.6mm以下、好ましくは粒径0.3mm以下の微粉を分級して除去する。すなわち、再生細骨材中の粒径0.6mm以下、とくに粒径0.3mm以下の微粉には、セメント分微粒子が多く含まれ、慣性円錐磨砕機によって磨砕されると圧縮され、2〜10mm程度の圧片(2次粒子)となる。本来、この圧片は磨砕工程後に分級機によってセメント微粒子側に除去したいものであるが、分級機では圧片のまま分級作用を受けるため、粗粒側の再生細骨材に混入し、吸収率を上昇させる(低下を妨げる)原因となる。したがって
、再生細骨材中の粒径0.6mm以下の微粉は、これを磨砕工程前に除去する。
In the present invention, the fine particle having a particle size of 0.6 mm or less, preferably 0.3 mm or less in the recycled fine aggregate is classified before the recycled fine aggregate is put into the inertial conical grinder. the classification mechanism for removing provided, this before as milling step by the following particle size 0.6mm playing fine aggregate, preferably removed and classified following fine grain size 0.3 mm. That is, the fine particle having a particle size of 0.6 mm or less, particularly 0.3 mm or less, in the recycled fine aggregate contains a large amount of cement fine particles, and is compressed when ground by an inertia cone grinder. It becomes a pressure piece (secondary particle) of about 10 mm. Originally, this pressed piece is intended to be removed to the cement fine particle side by a classifier after the grinding process. However, since the classifier is subjected to the classification action with the pressed piece, it is mixed into the regenerated fine aggregate on the coarse grain side and absorbed. Causes the rate to rise (prevent the decline). Therefore, the particle size 0.6mm following fines in reproducing fine aggregate, you remove it ago milling step.

ここで、本発明で使用する慣性円錐磨砕機は、マントルの下方にアンバランスウエイトを備えており、このアンバランスウエイトの調整及び円錐ヘッドの回転数の変更などで、磨砕力を容易に変更することができる。とくに円錐ヘッドの回転数の変更による磨砕力の調整は、インバータ制御の採用により、再生細骨材(被磨砕物)の性状に合わせ運転中に任意に行うことができるため、再生細骨材が過磨砕とならず、再生細骨材表面のセメント分のみを剥離することができる。すなわち、再生細骨材表面のセメント分のみを剥離可能な“ぎりぎり”の磨砕力に設定し高速回転で磨砕する(低い磨砕力で数多く磨砕する)ことで、再生細骨材表面のセメント分のみを効率的に剥離することができ、吸水率を低減することができる。   Here, the inertia cone grinding machine used in the present invention has an unbalanced weight below the mantle, and the grinding force can be easily changed by adjusting the unbalanced weight and changing the rotational speed of the cone head. can do. In particular, the adjustment of the grinding force by changing the rotation speed of the conical head can be performed arbitrarily during operation according to the properties of the recycled fine aggregate (the material to be ground) by adopting inverter control. However, it does not overgrind and only the cement content on the surface of the regenerated fine aggregate can be peeled off. In other words, the surface of the regenerated fine aggregate is set to a “grinding” grinding force that can peel only the cement content on the surface of the regenerated fine aggregate, and is ground at high speed rotation (a large amount of grinding is performed with a low grinding force). Only the cement content can be efficiently peeled off, and the water absorption rate can be reduced.

これに対して、例えばコーンクラッシャであれば、磨砕力の調整ができないため、通常の出口隙間では過磨砕となり、骨材部分まで磨砕してしまう。そこで過磨砕とならないよう出口隙間を広げる必要がある。出口隙間を広げると、その分通過速度が速くなり磨砕時間(磨砕機内滞留時間)が短くなり、磨砕される回数が少なる。なお、コーンクラッシャの通常の回転数は250min−1〜300min−1であり、被磨砕物が磨砕中に受ける磨砕回数は、仮に磨砕時間(磨砕機内滞留時間)を1分とすると、250回〜300回である。 On the other hand, for example, in the case of a cone crusher, the grinding force cannot be adjusted. Therefore, overgrinding occurs in a normal exit gap, and the aggregate portion is ground. Therefore, it is necessary to widen the exit gap so as not to overgrind. If the exit gap is widened, the passage speed is increased accordingly, the grinding time (retention time in the grinding machine) is shortened, and the number of times of grinding is reduced. Normally the rotational speed of the cone crusher is 250min -1 ~300min -1, grinding砕回number HiMigaku grind undergoes grinding砕中, when if grinding time between (the attritor residence time) and 1 minute , 250 to 300 times.

本発明で使用する慣性円錐磨砕機の場合、上述のとおり磨砕力が調整できるため、低い磨砕力で出口隙間を小さくして通過速度を遅くし、磨砕時間(磨砕機内滞留時間)を長くすることができる。また、慣性円錐磨砕機の通常の回転数は800min−1〜1150min−1とコーンクラッシャに比べ3〜4倍であり、被磨砕物が破砕中に受ける磨砕回数は、仮に破砕時間(磨砕機内滞留時間)を同じく1分とすると、コーンクラッシャの3〜4倍の800〜1150回となる。 In the case of the inertia cone grinder used in the present invention, since the grinding force can be adjusted as described above, the outlet gap is reduced with a low grinding force to reduce the passage speed, and the grinding time (retention time in the grinder). Can be lengthened. In addition, the normal rotational speed of the inertia cone grinder is 800 min −1 to 1150 min −1 , which is 3 to 4 times that of the cone crusher. If the internal residence time is also 1 minute, it is 800 to 1150 times, 3 to 4 times the cone crusher.

本発明によれば、粒径が5mm未満の再生細骨材の吸水率を確実かつ効率的に低減することができる。   According to the present invention, it is possible to reliably and efficiently reduce the water absorption rate of recycled fine aggregate having a particle size of less than 5 mm.

以下、図面を参照して本発明の実施の形態を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1は、本発明の再生細骨材の吸水率を低減する設備の設備構成を示す。   FIG. 1 shows the equipment configuration of equipment for reducing the water absorption rate of the recycled fine aggregate of the present invention.

コンクリート廃材は粒径40mm以下に予備破砕され、振動式破砕機1に連続的に投入される。振動破砕機1のドラム状の破砕室1a内には、ロッド径50〜30mm程度の大径破砕媒体ロッドとロッド径30未満〜19mm程度の小径破砕媒体ロッドの2種類が充填されており、この破砕室1aを加振機により振動させることにより骨材表面に付着したセメント分が剥離し、かつ骨材の大きさは粒径25mm以下程度に破砕され、排出口1bから排出される。排出口1bからは分級用空気が導入され、分級用空気とともに破砕物のうちの粒径が0.3mm以下程度の微粉(主にセメント分)が排気口1cから排出される。この微粉はブロアー7aによって吸引されて移送され、サイクロン5a及びバグフィルタ6aで回収され、ダストとして排出される。すなわち、この分級用空気を利用した分級機構によって、破砕物(粒径25mm以下程度の再生骨材)から0.3mm以下程度の微粉が除去される。   The concrete waste material is preliminarily crushed to a particle size of 40 mm or less and continuously fed into the vibration crusher 1. The drum-shaped crushing chamber 1a of the vibration crusher 1 is filled with two types, a large-diameter crushing medium rod having a rod diameter of about 50 to 30 mm and a small-diameter crushing medium rod having a rod diameter of less than 30 to about 19 mm. By vibrating the crushing chamber 1a with a vibrator, the cement attached to the aggregate surface is peeled off, and the size of the aggregate is crushed to a particle size of about 25 mm or less and discharged from the discharge port 1b. Classification air is introduced from the discharge port 1b, and fine powder (mainly cement) having a particle size of about 0.3 mm or less is discharged from the exhaust port 1c together with the classification air. The fine powder is sucked and transferred by the blower 7a, collected by the cyclone 5a and the bag filter 6a, and discharged as dust. That is, fine powder of about 0.3 mm or less is removed from the crushed material (recycled aggregate having a particle size of about 25 mm or less) by the classification mechanism using the classification air.

微粉が除去された粒径25mm以下程度の再生骨材は、スクリーン2にかけられ、ふるい分けされる。スクリーン2は、20mmサイズの上段スクリーン2aと5mmサイズの下段スクリーン2bを備え、上段スクリーン2a上の粗粒は振動破砕機1に戻され、再度破砕される。そして、下段スクリーン2b上の粒径20mm未満〜5mmの骨材は再生粗骨材として回収される。また、下段スクリーン2b下の粒径5mm未満の再生骨材は再生細骨材として回収された後、慣性円錐磨砕機3に投入される。   The recycled aggregate having a particle size of about 25 mm or less from which the fine powder has been removed is applied to the screen 2 and screened. The screen 2 includes an upper screen 2a having a size of 20 mm and a lower screen 2b having a size of 5 mm, and coarse particles on the upper screen 2a are returned to the vibration crusher 1 and crushed again. Then, the aggregate having a particle size of less than 20 mm to 5 mm on the lower screen 2b is recovered as a recycled coarse aggregate. Further, the recycled aggregate having a particle size of less than 5 mm under the lower screen 2b is recovered as a recycled fine aggregate, and is then put into the inertia cone crusher 3.

慣性円錐磨砕機3については後で詳しく説明するが、慣性円錐機磨砕機3では、遠心磨砕機構により、再生細骨材の表面のセメント分が骨材相互の磨砕により剥離され、かつ骨材は相互の磨砕により丸みの有る粒子に整粒され排出される。   The inertia cone grinder 3 will be described in detail later. In the inertia cone grinder 3, the cement content on the surface of the regenerated fine aggregate is separated by the mutual grinding by the centrifugal grinding mechanism, and the bone The material is sized and discharged into round particles by mutual grinding.

慣性円錐磨砕機3より排出された磨砕物(再生細骨材と剥離したセメント分微粒子の混合物)は、分級機としてのラダー式風力選別装置4に投入される。ラダー式風力選別装置4において、投入された磨砕物は、上部から下部方向へジグザグに通過して落下する。その際、本体上部に設けた吸引口4aよりブロアー7bの吸引力によってダスト(主に剥離したセメント分微粒子)のみ吸引されて分級される。吸引されたダストは、サイクロン5b及びバグフィルタ6bで回収される。すなわち、ラダー式風力選別装置4の本体下部からはダスト(セメント分微粒子)が取り除かれた再生細骨材が排出される。本体下部にはダンパ4bが設けられており、本体下部から排出される再生細骨材の0〜90%を循環ライン8を介して慣性円錐磨砕機3に戻し、残りの100〜10%を良質の再生細骨材として回収する。このように0〜90%を戻すことで、再度、磨砕及び分級が繰り返され、所望の良質の再生細骨材を得ることができる。   The ground product (mixture of recycled fine aggregate and exfoliated cement fine particles) discharged from the inertia cone grinder 3 is put into a ladder type wind power sorter 4 as a classifier. In the ladder-type wind power sorter 4, the introduced ground material passes through the zigzag from the top to the bottom and falls. At that time, only dust (mainly separated cement fine particles) is sucked and classified by the suction force of the blower 7b from the suction port 4a provided in the upper part of the main body. The sucked dust is collected by the cyclone 5b and the bag filter 6b. That is, the recycled fine aggregate from which the dust (cement fine particles) has been removed is discharged from the lower part of the main body of the ladder type wind power sorting device 4. A damper 4b is provided at the lower part of the main body, and 0 to 90% of the recycled fine aggregate discharged from the lower part of the main body is returned to the inertia cone grinder 3 through the circulation line 8, and the remaining 100 to 10% is good quality. Collect as recycled fine aggregate. Thus, by returning to 0-90%, grinding and classification are repeated again, and a desired fine recycled fine aggregate can be obtained.

ここで、0〜90%を戻して循環磨砕する理由は、コンクリート廃材は廃棄物回収品であり、コンクリートの原骨材の特性(吸水率など物理的性質)や、使用されたセメントの種類やコンクリート中の含有量、さらには、目的とする再生細骨材の要求物理的性質により、磨砕の程度を変えなければならないからである。すなわち、循環率を大きくすると、原骨材の吸水率に近い再生細骨材が得られる。再生細骨材原料の吸水率が再生細骨材M規格を満足する程度のおおよそ7〜6%程度であれば原骨材の品質にもよるが、循環率の調整で、再生細骨材H規格を十分満足する物理的品質の再生細骨材を得ることができる。   Here, the reason for circulating grinding by returning to 0-90% is that the concrete waste is a waste recovery product, the properties of the concrete aggregate (physical properties such as water absorption) and the type of cement used This is because the degree of grinding must be changed depending on the content in concrete and concrete, and further, the required physical properties of the desired recycled fine aggregate. That is, when the circulation rate is increased, a recycled fine aggregate close to the water absorption rate of the original aggregate can be obtained. If the water absorption rate of the recycled fine aggregate raw material is about 7 to 6% that satisfies the recycled fine aggregate M standard, it depends on the quality of the raw aggregate, but by adjusting the circulation rate, the recycled fine aggregate H It is possible to obtain a recycled fine aggregate having a physical quality that sufficiently satisfies the standard.

次に、本発明の再生細骨材の吸水率を低減する設備において重要な役割を果たす慣性円錐磨砕機3の構成を図2により説明する。   Next, the structure of the inertia cone grinder 3 which plays an important role in the facility for reducing the water absorption rate of the recycled fine aggregate of the present invention will be described with reference to FIG.

慣性円錐磨砕機3は、上部に骨材投入口10を有し、中間部に球面座支持体11を有し、下部に軸受部12を有する略円筒状のシェル13が防振ゴム14に支持されて設けられ、シェル13の骨材投入口10の下部には、表面が逆円錐状のコーンケーブ15が取り付けられ球面座支持体11には球面座16が取り付けられ、下部の軸受部12には、モータ17からVベルト18及びプーリ19を介して駆動される駆動軸20が支持されている。駆動軸20には回転を伝達でき、かつ揺動可能なスピンドルシャフト21の一端が支持され、スピンドルシャフト21の他端は主軸22に回転を伝達でき、かつ揺動可能に接続されている。また、主軸22の下部にはアンバランスウエイト23が取り付けられ、上部には球面座16に支承される円錐ヘッド24が取り付けられ、円錐ヘッド24の上面には、コーンケーブ15に対向してマントル25が取り付けられている。そして円錐ヘッド24は球面座16上を回転可能であると共に球面に沿って揺動することができるようになっている。なお、26は円錐ヘッド24と球面座支持体11との間をシールするように球面座支持体11に設けられたダストシール26である。   The inertia cone grinder 3 has an aggregate inlet 10 in the upper part, a spherical seat support 11 in the middle part, and a substantially cylindrical shell 13 having a bearing part 12 in the lower part supported by the vibration isolating rubber 14. A cone cave 15 having an inverted conical surface is attached to the lower portion of the aggregate inlet 10 of the shell 13, a spherical seat 16 is attached to the spherical seat support 11, and the lower bearing portion 12 is attached to the lower bearing portion 12. A drive shaft 20 driven from the motor 17 via the V belt 18 and the pulley 19 is supported. One end of a spindle shaft 21 capable of transmitting rotation and swinging is supported on the drive shaft 20, and the other end of the spindle shaft 21 is connected to the main shaft 22 so as to be swingable and swingable. An unbalanced weight 23 is attached to the lower part of the main shaft 22, and a conical head 24 supported on the spherical seat 16 is attached to the upper part. A mantle 25 is opposed to the cone cave 15 on the upper surface of the conical head 24. It is attached. The conical head 24 can rotate on the spherical seat 16 and can swing along the spherical surface. Reference numeral 26 denotes a dust seal 26 provided on the spherical seat support 11 so as to seal between the conical head 24 and the spherical seat support 11.

この慣性円錐磨砕機3の磨砕作用を図3により説明する。   The grinding action of the inertia cone grinding machine 3 will be described with reference to FIG.

まず、図3(a)の状態においてコーンケーブ15とマントル25とにより構成される破砕室左端では、アンバランスウエイト23の回転により発生する遠心力によりマントル25はコーンケーブ15との隙間が0mmに近い状態でコーンケーブ15内面を転動し、再生細骨材28の磨砕を行う、右端では破砕室内が振動しているため、再生細骨材の充填状態は高密度状態となる。   First, at the left end of the crushing chamber constituted by the cone cave 15 and the mantle 25 in the state of FIG. 3A, the mantle 25 is in a state where the gap with the cone cave 15 is close to 0 mm due to the centrifugal force generated by the rotation of the unbalance weight 23. Thus, the inner surface of the corn cave 15 rolls to grind the recycled fine aggregate 28. Since the crushing chamber vibrates at the right end, the filled state of the recycled fine aggregate becomes a high density state.

次いで、マントル25が転動し図3(b)の状態となると、破砕室左端では圧縮磨砕された再生細骨材が重力と振動により排出される。さらにマントル25が転動し図3(c)の状態となると、図3(a)と反対に、破砕室左端に再生細骨材が充填され、右端では、高密度状態の再生細骨材をマントル25とコーンケーブ15との隙間が0mmに近い状態で転動するため、再生細骨材の逃げ場がなく、骨材相互で表面のセメントペースト分が磨砕により粒子から剥離され、かつ再生細骨材は丸みをおびた粒子となる。   Next, when the mantle 25 rolls to the state shown in FIG. 3B, the recycled fine aggregate that has been compressed and ground is discharged by gravity and vibration at the left end of the crushing chamber. Further, when the mantle 25 rolls to the state of FIG. 3C, the reclaimed fine aggregate is filled at the left end of the crushing chamber, and at the right end, the regenerated fine aggregate in the high density state is filled, contrary to FIG. 3A. Since the rolling between the mantle 25 and the corn cave 15 is close to 0 mm, there is no escape space for the regenerated fine aggregate, the cement paste on the surface of the aggregate is separated from the particles by grinding, and the regenerated fine bone The material becomes rounded particles.

この慣性円錐磨砕機3では、上述のとおりアンバランスウエイト23の調整及び円錐ヘッド24の回転数の変更などで、磨砕力を容易に変更することができ、例えば、アンバランスウエイト23の固定ウエイトとの角度位置をずらすことで骨材自体は破砕されず、骨材表面のセメント分のみが剥離するぎりぎりの磨砕力に調整することができる。そして、この慣性円錐磨砕機3によれば、(1)磨砕機内滞留時間が長く取れる、(2)回転数が高い、という2つの相乗効果も相俟って、従来の磨砕機では、同一磨砕機による破砕工程を3〜4回繰り返す必要があるのに対し、慣性円錐磨砕機では1回又は循環連続処理による磨砕工程で、建築構造用再生骨材認定基準に定められた品質規定のうち最も重要な、絶乾密度2.5kg/cm以上及び吸水率3.5%以下を満たすことができる。 In the inertia cone grinder 3, the grinding force can be easily changed by adjusting the unbalance weight 23 and changing the rotational speed of the cone head 24 as described above. For example, the fixed weight of the unbalance weight 23 is fixed. By shifting the angular position, the aggregate itself is not crushed, and it can be adjusted to the last grinding force at which only the cement on the surface of the aggregate peels. And according to this inertia cone grinder 3, in the conventional grinder, the two synergistic effects of (1) long residence time in the grinder and (2) high rotation speed are combined. While it is necessary to repeat the crushing process by the grinder 3 to 4 times, the inertia cone grinder has the quality regulation defined in the recycled aggregate certification standard for building structures in one or the continuous grinding process. Among them, the most important dry density of 2.5 kg / cm 3 or more and water absorption of 3.5% or less can be satisfied.

また、コーンクラッシャでは、同一破砕機で3〜4回の破砕を行わなくてはならないため、処理工程がバッチ処理となり、連続的な処理ができない。これに比べ、慣性円錐破砕機では、1回の処理又は循環連続処理でよいため連続的な処理工程が実現できる。   Moreover, in a cone crusher, since 3 to 4 times must be crushed with the same crusher, a process process becomes a batch process and a continuous process cannot be performed. In contrast, in the inertia cone crusher, a single treatment or a continuous circulation treatment may be used, so that a continuous treatment process can be realized.

このように、本発明によれば、(1)連続処理ができるため、生産効率が向上する、(2)再生細骨材原料の品質又は要求品質に合わせた処理ができるため、省電力で消耗品も節約できるなど、生産性の向上に大きな効果を得ることができる。   As described above, according to the present invention, (1) continuous processing can be performed, so that production efficiency can be improved. (2) processing according to the quality of the recycled fine aggregate raw material or required quality can be performed. The product can be saved, and a great effect can be obtained in improving productivity.

図1の下段スクリーン2b下で回収した再生細骨材原料(絶乾密度2.28g/cm、吸水率6.61%)を供試材とし、これを慣性円錐磨砕機3の回転数を820min−1として磨砕し、ラダー式風力選別装置4の吸引口4aからの吸引量を調整し、分級点1.0mmまたは分級点0.3mmを目標として再生細骨材を得た。この際、ラダー式風力選別装置4の本体下部から慣性円錐磨砕機3に戻す循環率は0%とした。すなわち、再生細骨材原料の磨砕工程は1回のみとした。 The recycled fine aggregate raw material (absolute dry density 2.28 g / cm 3 , water absorption 6.61%) collected under the lower screen 2b in FIG. 1 is used as a test material, and this is used as the rotational speed of the inertia cone crusher 3. Grinding to 820 min −1 , adjusting the amount of suction from the suction port 4a of the ladder-type wind power sorting device 4, and obtaining a recycled fine aggregate with a classification point of 1.0 mm or a classification point of 0.3 mm as a target. At this time, the circulation rate of returning from the lower part of the main body of the ladder-type wind power sorter 4 to the inertia cone grinder 3 was set to 0%. That is, the recycled fine aggregate raw material was ground once.

得られた再生細骨材の物理的性質は、分級点1.0mmを目標に吸引した試験結果では、絶乾密度2.58g/cm、吸水率3.10%であった。また、分級点0.3mmを目標に吸引した試験結果では、絶乾密度2.56g/cm、吸水率3.42%であった。いずれもJISA5021 コンクリート用再生骨材Hに定められている品質規定を満足するものであった。 The physical properties of the obtained recycled fine aggregates were as follows: the absolute dry density was 2.58 g / cm 3 , and the water absorption was 3.10%. Moreover, in the test result which attracted | sucked aiming at the classification point 0.3mm, the absolute dry density was 2.56g / cm < 3 > and the water absorption rate was 3.42%. All of them satisfied the quality regulations defined for recycled aggregate H for JIS A5021 concrete.

図1の下段スクリーン2b下で回収した吸水率7.5%の再生細骨材原料を供試材とし、これを慣性円錐磨砕機3の回転数を820min−1として磨砕し、ラダー式風力選別装置4の吸引口4aからの吸引量を調整し、分級点0.3mmを目標として再生細骨材を得た。この際、ラダー式風力選別装置4の本体下部から慣性円錐磨砕機3に戻す循環率を変化させ、この循環率と得られた再生細骨材の吸水率との関係を調査した。 Recycled fine aggregate raw material with a water absorption rate of 7.5% recovered under the lower screen 2b in FIG. 1 is used as a test material, and this is ground at a rotational speed of the inertia cone grinder 3 of 820 min −1 to obtain a ladder type wind power. The amount of suction from the suction port 4a of the sorting device 4 was adjusted, and a recycled fine aggregate was obtained with a classification point of 0.3 mm as a target. At this time, the circulation rate returned from the lower part of the main body of the ladder-type wind power sorter 4 to the inertia conical grinder 3 was changed, and the relationship between this circulation rate and the water absorption rate of the obtained recycled fine aggregate was investigated.

その結果を図4に示す。同図に示すように、循環率を上げると吸水率は低下し、この例では循環率を約50%にすることにより、JISA5021 コンクリート用再生骨材Hに定められている品質規定(吸水率3.5%以下)を満足する再生細骨材が得られた。   The result is shown in FIG. As shown in the figure, when the circulation rate is increased, the water absorption rate is decreased. In this example, by setting the circulation rate to about 50%, the quality regulation (water absorption rate 3) defined for the recycled aggregate H for JIS A5021 concrete is used. Regenerated fine aggregate satisfying .5% or less) was obtained.

本発明は、コンクリート廃材から細骨材を再生製造する設備に適用できる。   The present invention can be applied to equipment for remanufacturing and manufacturing fine aggregate from concrete waste.

本発明の再生細骨材の吸水率を低減する設備の設備構成を示す。The equipment structure of the equipment which reduces the water absorption rate of the reproduction | regeneration fine aggregate of this invention is shown. 本発明で使用する慣性円錐磨砕機の構成を示す。The structure of the inertia cone grinder used by this invention is shown. 慣性円錐磨砕機の作用を示す。The operation of an inertia cone grinder is shown. 循環率と再生細骨材の吸水率との関係を示す。The relationship between the circulation rate and the water absorption rate of recycled fine aggregate is shown.

符号の説明Explanation of symbols

1 振動式破砕機
1a 破砕室
1b 排出口
1c 排気口
2 スクリーン
2a 上段スクリーン
2b 下段スクリーン
3 慣性円錐磨砕機
4 ラダー式風力選別装置
4a 吸引口
4b ダンパ
5a、5b サイクロン
6a、6b バグフィルタ
7a、7b ブロアー
8 循環ライン
10 骨材投入口
11 球面座支持体
12 軸受部
13 シェル
14 防振ゴム
15 コーンケーブ
16 球面座
17 モータ
18 Vベルト
19 プーリ
20 駆動軸
21 スピンドルシャフト
22 主軸
23 アンバランスウエイト
24 円錐ヘッド
25 マントル
26 ダストシール
27 球面軸受
DESCRIPTION OF SYMBOLS 1 Vibrating crusher 1a Crushing chamber 1b Discharge port 1c Exhaust port 2 Screen 2a Upper screen 2b Lower screen 3 Inertial conical grinder 4 Ladder type wind sorter 4a Suction port 4b Damper 5a, 5b Cyclone 6a, 6b Bag filter 7a, 7b Blower 8 Circulation line 10 Aggregate inlet 11 Spherical seat support 12 Bearing portion 13 Shell 14 Vibration-proof rubber 15 Cone cable 16 Spherical seat 17 Motor 18 V-belt 19 Pulley 20 Drive shaft 21 Spindle shaft 22 Main shaft 23 Unbalanced weight 24 Conical head 25 Mantle 26 Dust seal 27 Spherical bearing

Claims (2)

コンクリート廃材を破砕して得られた再生骨材のうち、粒径が5mm未満の再生細骨材の吸水率を低減する設備であって、
前記再生細骨材を磨砕する慣性円錐磨砕機と、
この慣性円錐磨砕機から排出された磨砕物を受け入れて、この磨砕物中の再生細骨材とセメント分微粒子とを分級し、再生細骨材を得る分級機とを備え、
前記慣性円錐磨砕機が、シェルと、このシェルに設けられた球面座支持体と、この球面座支持体に取り付けられた球面座と、この球面座に支承され、偏心しながら回転駆動される円錐ヘッドと、この円錐ヘッドに取り付けられたマントルと、このマントルに対向してシェルに取り付けられたコーンケーブと、マントルの下方に取り付けられたアンバランスウエイトとを備え、前記円錐ヘッドが球面座上を偏心しながら回転駆動されることにより
、マントルとコーンケーブとの間で再生細骨材を磨砕するものであり、
さらに、再生細骨材を慣性円錐磨砕機に投入する前段階で、再生細骨材中の粒径0.6mm以下の微粉を分級して除去する分級機構を備えた、再生細骨材の吸水率を低減する設備。
Among the recycled aggregates obtained by crushing waste concrete, it is a facility that reduces the water absorption rate of recycled fine aggregates having a particle size of less than 5 mm,
An inertia cone grinder for grinding the recycled fine aggregate;
It is equipped with a classifier that receives the milled product discharged from the inertia cone grinder, classifies the recycled fine aggregate and cement fine particles in the milled product, and obtains the recycled fine aggregate,
The inertia cone grinder includes a shell, a spherical seat support provided on the shell, a spherical seat attached to the spherical seat support, a cone supported on the spherical seat, and rotationally driven while being eccentric. A head, a mantle attached to the conical head, a cone cave attached to the shell opposite to the mantle, and an unbalanced weight attached to the lower part of the mantle, wherein the conical head is eccentric on the spherical seat by being rotated while state, and are not grinding the reproduced fine aggregate between mantle and Konkebu,
Furthermore, the water absorption of the regenerated fine aggregate is equipped with a classification mechanism that classifies and removes fine powder having a particle size of 0.6 mm or less in the regenerated fine aggregate before the regenerated fine aggregate is put into the inertia cone grinding machine. Equipment that reduces the rate.
コンクリート廃材を破砕して得られた再生骨材のうち、粒径が5mm未満の再生細骨材の吸水率を低減する方法であって、
前記再生細骨材を慣性円錐磨砕機によって磨砕する磨砕工程と、
前記慣性円錐磨砕機から排出された磨砕物中の再生細骨材とセメント分微粒子とを分級し、再生細骨材を得る分級工程とを含み、
前記慣性円錐磨砕機として、シェルと、このシェルに設けられた球面座支持体と、この球面座支持体に取り付けられた球面座と、この球面座に支承され、偏心しながら回転駆動される円錐ヘッドと、この円錐ヘッドに取り付けられたマントルと、このマントルに対向してシェルに取り付けられたコーンケーブと、マントルの下方に取り付けられたアンバランスウエイトとを備え、前記円錐ヘッドが球面座上を偏心しながら回転駆動されることにより、マントルとコーンケーブとの間で再生細骨材を磨砕するものを使用し、
前記磨砕工程の前に、再生細骨材中の粒径0.6mm以下の微粉を分級して除去する、再生細骨材の吸水率を低減する方法。
Among the recycled aggregates obtained by crushing concrete waste, it is a method of reducing the water absorption rate of recycled fine aggregate having a particle size of less than 5 mm,
A grinding step of grinding the recycled fine aggregate with an inertia cone grinding machine;
Classifying the recycled fine aggregate and cement fine particles in the ground product discharged from the inertia cone grinder to obtain a recycled fine aggregate,
As the inertia cone grinder, a shell, a spherical seat support provided on the shell, a spherical seat attached to the spherical seat support, a cone supported on the spherical seat and driven to rotate while being eccentric. A head, a mantle attached to the conical head, a cone cave attached to the shell opposite to the mantle, and an unbalanced weight attached to the lower part of the mantle, wherein the conical head is eccentric on the spherical seat By using the one that grinds recycled fine aggregate between the mantle and corn cave by being driven while rotating ,
A method of reducing the water absorption rate of the regenerated fine aggregate by classifying and removing fine powder having a particle size of 0.6 mm or less in the regenerated fine aggregate before the grinding step .
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