JP2007186393A - Method and apparatus for manufacturing regenerated aggregate for concrete - Google Patents
Method and apparatus for manufacturing regenerated aggregate for concrete Download PDFInfo
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- JP2007186393A JP2007186393A JP2006007512A JP2006007512A JP2007186393A JP 2007186393 A JP2007186393 A JP 2007186393A JP 2006007512 A JP2006007512 A JP 2006007512A JP 2006007512 A JP2006007512 A JP 2006007512A JP 2007186393 A JP2007186393 A JP 2007186393A
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002826 coolant Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 66
- 238000007873 sieving Methods 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000007654 immersion Methods 0.000 abstract description 7
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract 5
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 10
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- -1 that is Substances 0.000 description 1
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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
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Abstract
Description
本発明は、コンクリート構造物の壁の破壊等によって生じるコンクリート塊から、コンクリートを作る材料となり得る砂利、すなわち粗骨材を再生するコンクリート用再生骨材製造方法及び装置に関する。 The present invention relates to a method and an apparatus for producing recycled aggregate for concrete, in which gravel that can be used as a material for making concrete, that is, coarse aggregate, is regenerated from a concrete block generated by destruction of a wall of a concrete structure.
コンクリート構造物の解体によって発生するコンクリート塊は、例えば破砕機による破砕処理がなされ、この破砕処理によって生じた破砕物は比較的付加価値が低い道路舗装用路盤材等に活用される。今後は、高度成長期に建造されたコンクリート構造物が一斉に寿命を迎えることから、上述したように解体によって発生するコンクリート塊は年々増加するものと予測される。このような状況から、従来、コンクリート塊からコンクリートを作る材料となり得る砂利、すなわち粗骨材を再生する技術が、特許文献１に提案されている。
The concrete lump generated by the dismantling of the concrete structure is crushed by, for example, a crusher, and the crushed material generated by the crushing process is used for roadbed materials for road pavement having a relatively low added value. In the future, concrete structures built during the high growth period will reach the end of their lives at the same time, and as described above, it is predicted that the concrete mass generated by dismantling will increase year by year. Under such circumstances,
この特許文献１に示される従来技術は、既存のコンクリート構造物の解体によって発生したコンクリート塊を、まず加熱乾燥機で約２００℃〜４００℃に加熱し、この加熱乾燥機によって乾燥させたコンクリート塊を、水を蓄えた浸水装置に投入する処理が行われる。その後、取り出されて凍結装置に入れられて凍結する処理が行われる。このようにして組織が脆弱化したコンクリート塊は、分離粉砕装置に投入されて粉砕され、さらに分別処理機にかけられる。
In the prior art disclosed in
この分別処理機によって、コンクリート塊が、砂利すなわち粗骨材と、砂及びセメント粉を含むモルタル分とに分別される。上述のように製造された粗骨材は、コンクリートを作るための材料として再利用が可能となる。
上述した従来技術では、コンクリート塊を加熱する加熱処理と、加熱乾燥したコンクリート塊を水に浸す浸水処理とを必要としていることから、粗骨材の製造工数が増加し、これによって製作費が高くなる懸念がある。 The above-described conventional technique requires heat treatment for heating the concrete lump and water immersion treatment for immersing the heat-dried concrete lump in water, which increases the number of manufacturing steps for the coarse aggregate, which increases the production cost. There are concerns.
本発明は、上述した従来技術における実状からなされたもので、その目的は、加熱処理、及び浸水処理を要することなく粗骨材を製造することができるコンクリート用再生骨材製造方法及び装置を提供することにある。 The present invention has been made from the above-described prior art, and an object thereof is to provide a recycled aggregate manufacturing method and apparatus for concrete capable of manufacturing a coarse aggregate without requiring heat treatment and water immersion treatment. There is to do.
この目的を達成するために、本発明は、コンクリート塊から粗骨材を再生するコンクリート用再生骨材製造方法において、上記コンクリート塊を破砕する１次破砕処理と、この１次破砕処理で破砕された第１破砕物を篩にかけ、粗骨材用素材を得る１次篩処理と、この１次篩処理で得られた粗骨材用素材を、この粗骨材用素材に含まれる水分が凍結し得る温度に保持された冷却媒体中に浸す冷却処理と、この冷却処理によって冷却された上記粗骨材用素材を破砕する２次破砕処理と、この２次破砕処理で破砕された第２破砕物を篩にかけ、粗骨材を得る２次篩処理とを含むことを特徴としている。 In order to achieve this object, the present invention provides a method for producing a recycled aggregate for concrete in which coarse aggregate is regenerated from a concrete block, and a primary crushing process for crushing the concrete block and the primary crushing process. The first crushed material is sieved to obtain a raw material for coarse aggregate, and the coarse aggregate material obtained by the primary sieving process is frozen by the moisture contained in the coarse aggregate material. A cooling process soaked in a cooling medium maintained at a possible temperature, a secondary crushing process for crushing the coarse aggregate material cooled by the cooling process, and a second crushing crushed by the secondary crushing process And a secondary sieving process for obtaining a coarse aggregate.
このように構成した本発明のコンクリート用再生骨材製造方法は、１次破砕処理、１次篩処理を経て得られた粗骨材用素材が、冷却処理によって脆化され、２次破砕処理によって破砕される。この２次破砕処理で得られた第２破砕物が、さらに２次篩処理で篩にかけられ、砂、セメント粉を含むモルタル分が除かれて所望の粗骨材を得ることができる。すなわち、加熱処理、及び浸水処理を要することなく、粗骨材を製造でき、この粗骨材の製造工数を少なく抑えることができる。 The method for producing recycled aggregate for concrete according to the present invention configured as described above is such that the coarse aggregate material obtained through the primary crushing process and the primary sieving process is embrittled by the cooling process, and then subjected to the secondary crushing process. It is crushed. The second crushed material obtained by the secondary crushing treatment is further sieved by the secondary sieving treatment, and the mortar containing sand and cement powder is removed to obtain a desired coarse aggregate. That is, a coarse aggregate can be produced without requiring heat treatment and water immersion treatment, and the number of steps for producing this coarse aggregate can be reduced.
また、本発明のコンクリート用再生骨材製造方法は、上記発明において、上記冷却処理の上記冷却媒体が液体窒素であることを特徴としている。 The method for producing a recycled aggregate for concrete according to the present invention is characterized in that, in the above invention, the cooling medium of the cooling treatment is liquid nitrogen.
また、本発明のコンクリート用再生骨材製造方法は、上記発明において、上記１次篩処理が、第１段篩にかけた際にこの第１段篩上に残された第１破砕物を除く第１段篩処理と、この第１段篩処理において第１段篩を通過した第１破砕物を、上記第１段篩よりも目の細かい第２段篩にかけた際に、この第２段篩を通過した第１破砕物を除く第２段篩処理とから成り、上記第２段篩処理において上記第２段篩上に残された第１破砕物を上記粗骨材用素材とすることを特徴としている。 Moreover, the recycled aggregate manufacturing method for concrete according to the present invention is the above invention, wherein the primary sieving treatment removes the first crushed material left on the first stage sieve when the first stage sieve is applied to the first stage sieve. When the first stage sieve process and the first crushed material that has passed through the first stage sieve in this first stage sieve process are passed through the second stage sieve, which is finer than the first stage sieve, the second stage sieve The second sieving process except for the first crushed material that has passed through the first crushed material left on the second sieving in the second sieving process. It is a feature.
また、本発明のコンクリート用再生骨材製造方法は、上記発明において、上記粗骨材用素材は、２．５ｍｍより大きく、上記コンクリート塊に用いられている粗骨材の最大粒径＋５ｍｍ以下の大きさであることを特徴としている。 Further, in the method for producing a recycled aggregate for concrete according to the present invention, in the above invention, the coarse aggregate material is larger than 2.5 mm, and the maximum particle size of the coarse aggregate used in the concrete block + 5 mm or less. It is characterized by its size.
また、上記目的を達成するために、本発明は、コンクリート塊を破砕する破砕機と、この破砕機で破砕された破砕物から粗骨材を得る篩とを備えたコンクリート用再生骨材製造装置において、上記コンクリート塊を破砕する第１破砕機と、この第１破砕機で破砕された第１破砕物から粗骨材用素材を得る１次篩と、この１次篩で得られる粗骨材用素材に含まれる水分が凍結し得る温度の冷却媒体が収容され、上記１次篩で得られた粗骨材用素材が浸される冷却槽と、この冷却槽によって冷却された上記粗骨材用素材を破砕する第２破砕機と、この第２破砕機で破砕された第２破砕物から粗骨材を得る２次篩とを備えたことを特徴としている。 Moreover, in order to achieve the said objective, this invention is a recycled aggregate manufacturing apparatus for concrete provided with the crusher which crushes a concrete lump, and the sieve which obtains coarse aggregate from the crushed material crushed with this crusher. , A first crusher for crushing the concrete block, a primary sieve for obtaining a raw material for coarse aggregate from the first crushed material crushed by the first crusher, and a coarse aggregate obtained by the primary sieve A cooling tank in which a cooling medium having a temperature at which water contained in the raw material can be frozen is housed and in which the raw material for coarse aggregate obtained by the primary sieve is immersed, and the coarse aggregate cooled by the cooling tank A second crusher for crushing the material for use and a secondary sieve for obtaining coarse aggregate from the second crushed material crushed by the second crusher are provided.
このように構成した本発明のコンクリート用再生骨材製造装置は、第１破砕機、１次篩による処理を経て得られた粗骨材用素材が、冷却槽において脆化され、第２破砕機によって破砕する。この第２破砕機で得られた第２破砕物が、さらに２次篩にかけられ、砂、セメント粉を含むモルタル分が除かれて所望の粗骨材を得ることができる。すなわち、加熱処理、及び浸水処理を要することなく、粗骨材を製造でき、この粗骨材の製造工数を少なく抑えることができる。 In the recycled aggregate manufacturing apparatus for concrete of the present invention configured as described above, the coarse aggregate material obtained through the treatment with the first crusher and the primary sieve is embrittled in the cooling tank, and the second crusher Crush. The second crushed material obtained by the second crusher is further passed through a secondary sieve, and the mortar containing sand and cement powder is removed to obtain a desired coarse aggregate. That is, a coarse aggregate can be produced without requiring heat treatment and water immersion treatment, and the number of steps for producing this coarse aggregate can be reduced.
また、本発明のコンクリート用再生骨材製造装置は、上記発明において、上記冷却槽に収容される上記冷却媒体が液体窒素であることを特徴としている。 The recycled aggregate manufacturing apparatus for concrete according to the present invention is characterized in that, in the above invention, the cooling medium accommodated in the cooling tank is liquid nitrogen.
また、本発明のコンクリート用再生骨材製造装置は、上記発明において、上記１次篩が、第１段篩と、この第１段篩よりも目の細かい第２段篩とから成ることを特徴としている。 The recycled aggregate manufacturing apparatus for concrete according to the present invention is characterized in that, in the above invention, the primary sieve is composed of a first stage sieve and a second stage sieve finer than the first stage sieve. It is said.
本発明のコンクリート用再生骨材製造方法及び装置は、１次破砕処理、１次篩処理を経て得られた粗骨材素材を冷却媒体中に浸す冷却処理により脆化させ、この脆化させた粗骨材素材に２次破砕処理、２次篩処理を施して砂利、すなわち粗骨材を製造するようにしてあることから、加熱処理、及び浸水処理を要することなく粗骨材を製造でき、従来に比べて粗骨材の製造工数を少なく抑えることができ、これに伴って粗骨材の製造費を低減させることができる。 The method and apparatus for producing recycled aggregate for concrete according to the present invention embrittles the coarse aggregate material obtained through the primary crushing treatment and the primary sieving treatment by a cooling treatment in which the coarse aggregate material is immersed in a cooling medium. Since the coarse aggregate material is subjected to secondary crushing treatment and secondary sieving treatment to produce gravel, that is, coarse aggregate, the coarse aggregate can be produced without requiring heat treatment and water immersion treatment, Compared to the prior art, the number of steps for manufacturing the coarse aggregate can be reduced, and the production cost of the coarse aggregate can be reduced accordingly.
以下，本発明に係るコンクリート用再生骨材製造方法、及び装置を実施するための最良の形態を図に基づいて説明する。 The best mode for carrying out the method and apparatus for producing recycled aggregate for concrete according to the present invention will be described below with reference to the drawings.
図１は本発明に係るコンクリート用再生骨材製造方法の一実施形態を示すフローチャートである。 FIG. 1 is a flowchart showing an embodiment of a method for producing recycled aggregate for concrete according to the present invention.
この図１に示すように、本実施形態に係るコンクリート用再生骨材製造方法は、はじめに、ジョークラッシャやインパクトクラッシャ等の第１破砕機を用いてコンクリート塊を破砕するステップＳ１の１次破砕処理を実施する。 As shown in FIG. 1, the method for producing recycled aggregate for concrete according to the present embodiment firstly performs a primary crushing process in step S1 of crushing a concrete block using a first crusher such as a jaw crusher or an impact crusher. To implement.
次にステップＳ２に移り、１次破砕処理で破砕されて得られた第１破砕物を篩にかけ、粗骨材を得る１次篩処理を実施する。この１次篩処理は、第１段篩にかけた際にこの第１段篩上に残された第１破砕物を除く第１段篩処理と、この第１段篩処理において第１段篩を通過した第１破砕物を、上記第１段篩よりも目の細かい第２段篩にかけた際に、この第２段篩を通過した第１破砕物を除く第２段篩処理とから成っている。 Next, it moves to step S2 and sifts the 1st crushed material obtained by crushing by the primary crushing process, and implements the primary sieving process which obtains a coarse aggregate. This primary sieving process includes a first stage sieving process that removes the first crushed material left on the first stage sieving when passed through the first stage sieving, and the first stage sieving process. When the first crushed material passed through the second stage sieve, which is finer than the first stage sieve, comprises a second stage sieving process that excludes the first crushed material that has passed through the second stage sieve. Yes.
すなわち、ステップＳ３に示すように、第１破砕物を例えば２５ｍｍの目の第１段篩にかけた際に、第１段篩上に残された２５ｍｍより大きい第１破砕物は、ステップＳ１に戻されて再びこのステップＳ１の１次破砕処理が実施される。なお、上述した第１段篩の２５ｍｍの目は、コンクリート塊に用いられている粗骨材の最大粒径が２０ｍｍの場合に、その最大粒径２０ｍｍ＋５ｍｍとして設定したものである。第１段篩を通過した第１破砕物は、ステップＳ４に示すように、第１段篩よりも目の細かい、例えば、２．５ｍｍの目の第２段篩にかけられる。このステップＳ４の第２段篩を通過した２．５ｍｍ以下の第１破砕物は、ステップＳ５に示すように、微粒粉として集められる。この微粒粉は、細骨材を形成する砂と、セメント粉、すなわちモルタル分で構成されている粉粒体である。また、ステップＳ４の第２段篩上に残された第１破砕物は、粗骨材用素材として集められる。この粗骨材用素材は、２．５ｍｍより大きく、２５ｍｍ以下の大きさである。 That is, as shown in step S3, when the first crushed material is passed through the first stage sieve of, for example, 25 mm, the first crushed material larger than 25 mm left on the first stage sieve returns to step S1. Then, the primary crushing process of step S1 is performed again. The 25 mm eyes of the first stage sieve described above are set as the maximum particle size of 20 mm + 5 mm when the maximum particle size of the coarse aggregate used in the concrete block is 20 mm. As shown in step S4, the first crushed material that has passed through the first stage sieve is passed through a second stage sieve that is finer than the first stage sieve, for example, 2.5 mm. The 1st crushed material of 2.5 mm or less which passed the 2nd stage sieve of this step S4 is collected as a fine powder, as shown to step S5. This fine powder is a powder composed of sand forming fine aggregate and cement powder, that is, mortar. Moreover, the 1st crushed material left on the 2nd stage sieve of step S4 is collected as a raw material for coarse aggregates. The coarse aggregate material is larger than 2.5 mm and not larger than 25 mm.
次に、ステップＳ６に示すように、この粗骨材用素材を冷却媒体が収容された冷却槽に投入し、粗骨材用素材の表面を速やかに冷却する冷却処理が実施される。冷却槽に収容される冷却媒体は、上述した第２段篩で得られる２．５ｍｍより大きく、２５ｍｍ以下の粗骨材用素材に含まれる水分が凍結し得る温度のもの、例えば約−２００℃に保持された液体窒素である。 Next, as shown in step S <b> 6, the coarse aggregate material is put into a cooling tank in which a cooling medium is stored, and a cooling process is performed in which the surface of the coarse aggregate material is quickly cooled. The cooling medium accommodated in the cooling tank has a temperature larger than 2.5 mm obtained by the above-described second stage sieve and a temperature at which moisture contained in the raw material for coarse aggregate of 25 mm or less can be frozen, for example, about −200 ° C. Liquid nitrogen held in the water.
粗骨材用素材の表面が冷却槽の液体窒素で冷却されると、この粗骨材用素材に含まれる水分が凍結し、微細なクラックが発生する。つまり、この粗骨材用素材が脆化する。 When the surface of the coarse aggregate material is cooled with liquid nitrogen in the cooling tank, moisture contained in the coarse aggregate material is frozen, and fine cracks are generated. That is, this coarse aggregate material becomes brittle.
次に、ステップＳ７に示すように、このように脆化した粗骨材用素材を、ボールミル、ロッドミル、一軸スクリュー磨砕機、ロールクラッシャ、コーンクラッシャ、インパクトクラッシャ、ジョークラッシャ等の第２破砕機を用いて破砕する２次破砕処理が実施される。 Next, as shown in step S7, the coarse aggregate material thus embrittled is subjected to a second crusher such as a ball mill, a rod mill, a single screw grinder, a roll crusher, a cone crusher, an impact crusher, or a jaw crusher. The secondary crushing process which crushes using is implemented.
次に、ステップＳ８に示すように、２次破砕処理によって得られた第２破砕物を、例えば目が２．５ｍｍの篩にかける２次篩処理が実施される。すなわち、ステップＳ９に示すように、篩にかけた際に、篩を通過した２．５ｍｍ以下の第２破砕物は、ステップＳ５に示すように、微粒粉として集められる。微粒粉については上述のとおりである。また、篩上に残された第２破砕物が、粗骨材、すなわちモルタル分の多くが取り除かれた砂利となる。このようにして得られる粗骨材は、２．５ｍｍよりも大きく、２５ｍｍ以下の大きさであり、再びコンクリートを作る材料として活用可能である。 Next, as shown in step S8, a secondary sieving process is performed in which the second crushed material obtained by the secondary smashing process is applied, for example, to a sieve having a mesh of 2.5 mm. That is, as shown in step S9, when sieving, the second crushed material of 2.5 mm or less that has passed through the sieve is collected as fine powder as shown in step S5. The fine powder is as described above. In addition, the second crushed material left on the sieve becomes gravel from which much of the coarse aggregate, that is, the mortar, has been removed. The coarse aggregate obtained in this way is larger than 2.5 mm and has a size of 25 mm or less, and can be used as a material for making concrete again.
なお、本実施形態に係るコンクリート用再生骨材製造方法に使用される装置は、図示しないが、上述したようにステップＳ１の１次破砕処理を実施する第１破砕機と、ステップＳ２の１次篩処理を実施する２５ｍｍの目の第１段篩、及び２．５ｍｍの目の第２段篩と、ステップＳ６の冷却処理で用いられる冷却媒体、例えば−２００℃の液体窒素が収容される冷却槽と、ステップＳ７の２次破砕処理を実施する第２破砕機と、ステップＳ８の２次篩処理に用いられる例えば２．５ｍｍの篩とによって構成されている。 In addition, although the apparatus used for the recycled aggregate manufacturing method for concrete which concerns on this embodiment is not illustrated, as mentioned above, the 1st crusher which implements the primary crushing process of step S1, and the primary of step S2 Cooling in which a first stage sieve of 25 mm eyes and a second stage sieve of 2.5 mm eyes for carrying out the sieving process and a cooling medium used in the cooling process of step S6, for example, liquid nitrogen at −200 ° C. are accommodated. It is comprised by the tank, the 2nd crusher which implements the secondary crushing process of step S7, and the 2.5-mm sieve used for the secondary sieving process of step S8.
このように構成した本実施形態に係るコンクリート用再生骨材製造方法、及び装置によれば、上述したようにステップＳ１の１次破砕処理、ステップＳ２の１次篩処理を経て得られた２．５ｍｍよりも大きく、２５ｍｍ以下の大きさの粗骨材用素材が、ステップＳ６の冷却処理によって脆化され、ステップＳ７の２次破砕処理で破砕される。この２次破砕処理で得られた第２破砕物が、さらにステップＳ８の２次篩処理で篩にかけられ、砂、セメント粉を含むモルタル分が除かれて所望の２．５ｍｍよりも大きく、２５ｍｍ以下の再生用の粗骨材を得ることができる。すなわち、コンクリート塊、あるいはこのコンクリート塊から生成された第１破砕物、粗骨材用素材、第２破砕物を加熱する加熱処理、水に浸す浸水処理を要することなく粗骨材を製造でき、この粗骨材の製造工数を少なく抑えることができる。これに伴って製造費を安くすることができる。 According to the method and apparatus for producing recycled aggregate for concrete according to the present embodiment configured as described above, it is obtained through the primary crushing process in step S1 and the primary sieving process in step S2, as described above. The coarse aggregate material having a size larger than 5 mm and not larger than 25 mm is embrittled by the cooling process in step S6 and crushed by the secondary crushing process in step S7. The second crushed material obtained by the secondary crushing process is further sieved by the secondary sieving process of step S8, and the mortar content including sand and cement powder is removed to be larger than the desired 2.5 mm, 25 mm The following coarse aggregate for reproduction can be obtained. That is, it is possible to produce a coarse aggregate without requiring a concrete lump, or a first crushed material generated from the concrete lump, a raw material for coarse aggregate, a heat treatment for heating the second crushed material, and a water immersion treatment for immersing in water, The number of manufacturing steps for this coarse aggregate can be reduced. Along with this, manufacturing costs can be reduced.
なお、本実施形態では、上記したステップＳ２に示すように、１次篩処理において、目が２５ｍｍの第１段篩と、目が２．５ｍｍの第２段篩とを用いたが、このステップＳ２の１次篩処理を目が２５ｍｍの篩のみを用いて行ってもよく、また、目が２．５ｍｍの篩のみを用いて行ってもよい。すなわち、１つの篩のみによる処理としてもよい。さらに、目が２５ｍｍの篩と、目が２．５ｍｍの篩の他に、目が２．５ｍｍと２５ｍｍの間の大きさとなる別の篩も用いた３段篩処理としてもよい。 In the present embodiment, as shown in Step S2 described above, in the primary sieving process, the first stage sieve with 25 mm eyes and the second stage sieve with 2.5 mm eyes are used. The primary sieving process of S2 may be performed using only a sieve having a 25 mm mesh, or may be performed using only a sieve having a 2.5 mm mesh. That is, it is good also as a process only with one sieve. Furthermore, in addition to a sieve having a 25 mm mesh and a 2.5 mm mesh, a three-stage sieving process using another sieve having a mesh size between 2.5 mm and 25 mm may be used.
Claims (7)
上記コンクリート塊を破砕する１次破砕処理と、
この１次破砕処理で破砕された第１破砕物を篩にかけ、粗骨材用素材を得る１次篩処理と、
この１次篩処理で得られた粗骨材用素材を、この粗骨材用素材に含まれる水分が凍結し得る温度に保持された冷却媒体中に浸す冷却処理と、
この冷却処理によって冷却された上記粗骨材用素材を破砕する２次破砕処理と、
この２次破砕処理で破砕された第２破砕物を篩にかけ、粗骨材を得る２次篩処理とを含むことを特徴とするコンクリート用再生骨材製造方法。 In a method for producing recycled aggregate for concrete that regenerates coarse aggregate from a concrete block,
A primary crushing process for crushing the concrete block,
The first crushed material crushed by this primary crushing treatment is sieved, and the primary sieving treatment to obtain a raw material for coarse aggregate,
A cooling process in which the coarse aggregate material obtained by the primary sieving process is immersed in a cooling medium maintained at a temperature at which water contained in the coarse aggregate material can be frozen;
A secondary crushing process for crushing the coarse aggregate material cooled by the cooling process;
A method for producing recycled aggregate for concrete, comprising: sieving the second crushed material crushed by the secondary crushing treatment to obtain a coarse aggregate.
上記冷却処理の上記冷却媒体が液体窒素であることを特徴とするコンクリート用再生骨材製造方法。 In the invention of claim 1,
A method for producing a recycled aggregate for concrete, wherein the cooling medium of the cooling treatment is liquid nitrogen.
上記１次篩処理が、
第１段篩にかけた際にこの第１段篩上に残された第１破砕物を除く第１段篩処理と、
この第１段篩処理において第１段篩を通過した第１破砕物を、上記第１段篩よりも目の細かい第２段篩にかけた際に、この第２段篩を通過した第１破砕物を除く第２段篩処理とから成り、
上記第２段篩処理において上記第２段篩上に残された第１破砕物を上記粗骨材用素材とすることを特徴とするコンクリート用再生骨材製造方法。 In the invention according to claim 1 or 2,
The primary sieving process is
A first stage sieving process that removes the first crushed material left on the first stage sieve when passed through the first stage sieve;
When the first crushed material that has passed through the first stage sieve in this first stage sieving process is passed through the second stage sieve that is finer than the first stage sieve, the first crushed article that has passed through the second stage sieve. Consisting of a second stage sieving process that excludes objects,
A method for producing recycled aggregate for concrete, characterized in that the first crushed material left on the second stage sieve in the second stage sieve treatment is used as the coarse aggregate material.
上記粗骨材用素材は、２．５ｍｍより大きく、上記コンクリート塊に用いられている粗骨材の最大粒径＋５ｍｍ以下の大きさであることを特徴とするコンクリート用再生骨材製造方法。 In the invention of claim 3,
The method for producing recycled aggregate for concrete, wherein the coarse aggregate material is larger than 2.5 mm and has a maximum grain size of the coarse aggregate used in the concrete block + 5 mm or less.
上記コンクリート塊を破砕する第１破砕機と、
この第１破砕機で破砕された第１破砕物から粗骨材用素材を得る１次篩と、
この１次篩で得られる粗骨材用素材に含まれる水分が凍結し得る温度に保持された冷却媒体が収容され、上記１次篩で得られた粗骨材用素材が浸される冷却槽と、
この冷却槽によって冷却された上記粗骨材用素材を破砕する第２破砕機と、
この第２破砕機で破砕された第２破砕物から粗骨材を得る２次篩とを備えたことを特徴とするコンクリート用再生骨材製造装置。 In a recycled aggregate production apparatus for concrete comprising a crusher for crushing a concrete block and a sieve for obtaining coarse aggregate from the crushed material crushed by this crusher,
A first crusher for crushing the concrete block,
A primary sieve for obtaining a coarse aggregate material from the first crushed material crushed by the first crusher;
A cooling tank in which a cooling medium maintained at a temperature at which water contained in the coarse aggregate material obtained by the primary sieve can be frozen is contained, and in which the coarse aggregate material obtained by the primary sieve is immersed When,
A second crusher for crushing the coarse aggregate material cooled by the cooling tank;
A recycled aggregate production apparatus for concrete, comprising: a secondary sieve for obtaining coarse aggregate from the second crushed material crushed by the second crusher.
上記冷却槽に収容される上記冷却媒体が液体窒素であることを特徴とするコンクリート用再生骨材製造装置。 In the invention of claim 5,
The recycled aggregate manufacturing apparatus for concrete, wherein the cooling medium accommodated in the cooling tank is liquid nitrogen.
上記１次篩が、第１段篩と、この第１段篩よりも目の細かい第２段篩とから成ることを特徴とするコンクリート用再生骨材製造装置。
In the invention according to claim 5 or 6,
The recycled aggregate manufacturing apparatus for concrete according to claim 1, wherein the primary sieve comprises a first stage sieve and a second stage sieve that is finer than the first stage sieve.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013255875A (en) * | 2012-06-11 | 2013-12-26 | Towani:Kk | Waste concrete material crusher and crushing plant |
| CN104671685A (en) * | 2015-02-02 | 2015-06-03 | 深圳市华威环保建材有限公司 | Production method of recycled aggregates of building wastes |
| CN113105135A (en) * | 2021-03-25 | 2021-07-13 | 中交二公局第四工程有限公司 | Production process of cement concrete recycled aggregate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013255875A (en) * | 2012-06-11 | 2013-12-26 | Towani:Kk | Waste concrete material crusher and crushing plant |
| CN104671685A (en) * | 2015-02-02 | 2015-06-03 | 深圳市华威环保建材有限公司 | Production method of recycled aggregates of building wastes |
| CN113105135A (en) * | 2021-03-25 | 2021-07-13 | 中交二公局第四工程有限公司 | Production process of cement concrete recycled aggregate |
| CN113105135B (en) * | 2021-03-25 | 2023-09-29 | 中交二公局第四工程有限公司 | Production process of cement concrete regenerated aggregate |
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