JP2005342655A - Manufacturing device and manufacturing method for product sand - Google Patents

Manufacturing device and manufacturing method for product sand Download PDF

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JP2005342655A
JP2005342655A JP2004167342A JP2004167342A JP2005342655A JP 2005342655 A JP2005342655 A JP 2005342655A JP 2004167342 A JP2004167342 A JP 2004167342A JP 2004167342 A JP2004167342 A JP 2004167342A JP 2005342655 A JP2005342655 A JP 2005342655A
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soil
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JP4589037B2 (en
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Masanobu Yamazaki
公信 山▲崎▼
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YAMAZAKI JARI SHOTEN KK
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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
    • Y02W30/78—Recycling of wood or furniture waste
    • 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

<P>PROBLEM TO BE SOLVED: To provide a means capable of obtaining a sufficient amount of product sand from surplus soil even in the case that the content of sand in the surplus soil is small, and further a means capable of obtaining a sufficient amount of the product sand accompanied by desired particle distribution. <P>SOLUTION: In a product sand manufacture plant 1, the surplus soil containing bulky objects such as rocks, concrete wastes and asphalt wastes, natural sand and soil produced in a building construction site, or the like, is conveyed to a material sorting device 2, and foreign matters such as iron scraps and wood in the surplus soil are removed. The surplus soil from which the foreign matters are removed is conveyed to a roller mill 4, and bulky objects in the surplus soil are crushed and turned to crushed sand. The surplus soil containing the natural sand, the crushed sand and the soil is conveyed to a sieving device 6 and classified into composite sand accompanied by the desired particle distribution, coarse grains and fine grains. The composite sand is sent to a washing device 8, washed with water and turned to the product sand. The coarse grains are returned to the roller mill 4 and crushed again. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、建設工事現場や土木工事現場などで発生する残土を加工して製品砂を製造するための製品砂の製造装置及び製造方法に関するものである。   The present invention relates to a product sand manufacturing apparatus and a manufacturing method for manufacturing product sand by processing residual soil generated at a construction site or a civil engineering site.

一般に、砂は、コンクリートなどの建設材料の基礎資材として広く用いられ、また公園の砂場などにも用いられる。しかしながら、近年、河川や海浜の天然砂が枯渇する傾向にあり、また環境保全上の要請から天然砂の採取規制が強化されつつある。そこで、建設工事現場や土木工事現場などで大量に発生する残土には砂が含まれていることから、目の粗さが異なる複数種のスクリーンを用い、残土を篩い分けて製品砂を得るようにした製品砂の製造方法ないしは製造装置が提案されている（例えば、特許文献１参照）。
特開平１１−３２２３８３号公報（段落［０００６］、図１） In general, sand is widely used as a basic material for construction materials such as concrete, and is also used for sandboxes in parks. However, in recent years, natural sand on rivers and beaches tends to be depleted, and natural sand collection regulations are being strengthened due to environmental conservation requirements. Therefore, since the residual soil generated in large quantities at construction sites and civil engineering sites contains sand, use multiple types of screens with different eye roughness to screen the residual soil to obtain product sand. There has been proposed a manufacturing method or a manufacturing apparatus for product sand (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-322383 (paragraph [0006], FIG. 1)

しかしながら、例えば特許文献１に記載されている製品砂の製造方法ないしは製造装置では、残土に含まれる砂の量が少ない場合は十分な量の製品砂を得ることができず、また所望の粒度分布を伴った製品砂を得ることができないことが多いといった問題がある。   However, for example, in the method or apparatus for producing product sand described in Patent Document 1, if the amount of sand contained in the residual soil is small, a sufficient amount of product sand cannot be obtained, and a desired particle size distribution is obtained. There is a problem that it is often not possible to obtain product sand accompanied by.

本発明は、上記従来の問題を解決するためになされたものであって、残土中の砂の含有量が少ない場合でも、該残土から十分な量の製品砂を得ることができる手段、さらには所望の粒度分布を伴った十分な量の製品砂を得ることができる手段を提供することを解決すべき課題とする。   The present invention has been made in order to solve the above-mentioned conventional problems, and is a means capable of obtaining a sufficient amount of product sand from the remaining soil even when the sand content in the remaining soil is small. It is an object to be solved to provide a means by which a sufficient amount of product sand with a desired particle size distribution can be obtained.

上記課題を解決するためになされた本発明にかかる製品砂の製造装置は、（ｉ）岩石やコンクリートガラやアスファルトガラなどの硬い粗大物と、砂と、土とを含む残土（例えば、建設工事現場、土木工事現場等で発生する残土）を受け入れ、該残土中の粗大物を破砕して上記砂と近似する粒度（粒度分布）の粒状物（砕砂）を生成する破砕機（例えば、ローラミル）と、（ii）破砕機から排出された砂と土と粒状物とを含む混合物を分級し、所望の粒度（粒度分布）の砂及び粒状物を含む混合物を製品砂として抽出する分級機（例えば、目の粗さが互いに異なる複数のスクリーンを用いた乾式篩分機）とを備えていることを特徴とするものである。   An apparatus for producing product sand according to the present invention made to solve the above-described problems includes: (i) a residual soil (for example, construction work) including hard coarse material such as rocks, concrete glass, and asphalt glass, sand, and earth. A crusher (for example, a roller mill) that accepts residual soil generated at the site, civil engineering work site, etc., and crushes coarse material in the residual soil to generate granular material (crushed sand) with a particle size (particle size distribution) similar to the above sand And (ii) a classifier that classifies a mixture containing sand, soil, and particulates discharged from a crusher, and extracts a mixture containing sand and granules having a desired particle size (particle size distribution) as product sand (for example, , A dry sieving machine using a plurality of screens having different meshes).

この製品砂の製造装置においては、分級機から排出される製品砂よりも粒度が大きい（粗い）粒状物を破砕機に戻す粗粒物戻し手段（例えば、バケットコンベア、ベルトコンベア、スクリューコンベア、フィーダー等）を備えているのが好ましく、さらに分級機から排出された製品砂に混入ないしは付着しているダストを除去するダスト除去手段（例えば、水洗装置）を備えているのがより好ましい。   In this product sand production apparatus, coarse particle return means (for example, a bucket conveyor, a belt conveyor, a screw conveyor, a feeder) that returns granular material having a larger particle size (coarse) than the product sand discharged from the classifier to the crusher. Etc.), and more preferably, a dust removing means (for example, a water washing device) for removing dust mixed or adhering to the product sand discharged from the classifier.

また、本発明にかかる製品砂の製造方法は、（ｉ）破砕機を用いて、岩石やコンクリートガラやアスファルトガラなどの硬い粗大物と、砂と、土とを含む残土中の粗大物を破砕して上記砂と近似する粒度（粒度分布）の粒状物（砕砂）を生成し、(ii)分級機を用いて、砂と土と粒状物とを含む混合物を分級し、所望の粒度（粒度分布）の砂及び粒状物からなる混合物を製品砂として抽出することを特徴とするものである。   Moreover, the manufacturing method of the product sand concerning this invention is using (i) crushing machine, and crushes coarse coarse substances in the residual soil containing rocks, concrete galley, asphalt galley, etc., sand, and soil. To produce a granular material (crushed sand) having a particle size (particle size distribution) similar to that of the above sand, and (ii) classifying the mixture containing sand, soil, and granular material using a classifier to obtain a desired particle size (particle size) Distribution) and a mixture of particulates is extracted as product sand.

本発明にかかる製品砂の製造装置ないしは製造方法によれば、残土に含まれる岩石やコンクリートガラやアスファルトガラなどの粗大物が、該残土に含まれる砂（以下、「自然砂」という。）と近似する粒度分布の粒状物すなわち砕砂に破砕される。したがって、破砕後の残土には、実質的に、ほぼ同一の粒度分布の自然砂及び砕砂が大量に含まれている。そして、これらの自然砂及び砕砂のうち、所望の粒度分布の自然砂及び砕砂が製品砂として抽出される。したがって、残土中の砂の含有量が少ない場合でも、残土から十分な量の製品砂を得ることができ、さらには所望の粒度分布を伴った十分な量の製品砂を得ることができる。   According to the apparatus or method for producing product sand according to the present invention, rocks, concrete galley, and asphalt galley contained in the remaining soil are sand contained in the remaining soil (hereinafter referred to as “natural sand”). It is crushed into granular material having an approximate particle size distribution, that is, crushed sand. Therefore, a large amount of natural sand and crushed sand having substantially the same particle size distribution are contained in the residual soil after crushing. Of these natural sand and crushed sand, natural sand and crushed sand having a desired particle size distribution are extracted as product sand. Therefore, even when the sand content in the residual soil is low, a sufficient amount of product sand can be obtained from the residual soil, and a sufficient amount of product sand with a desired particle size distribution can be obtained.

以下、添付の図面を参照しつつ、本発明の実施の形態を具体的に説明する。
図１は、本発明にかかる、建設工事現場や土木工事現場などで発生する残土を加工して製品砂を製造するための製品砂製造プラントの構成を示す模式図である。図１に示すように、この製品砂製造プラント１においては、建設工事現場や土木工事現場などからダンプトラック等を用いて運搬されてきた残土が、まず、ホッパーを兼ねた材料選別装置２に投入される。 Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing a configuration of a product sand production plant for processing product residue produced at a construction site or a civil engineering site according to the present invention to produce product sand. As shown in FIG. 1, in this product sand production plant 1, the residual soil transported from a construction site or civil engineering site using a dump truck or the like is first thrown into a material sorting device 2 that also serves as a hopper. Is done.

この残土には、天然の岩ないしは石（砂利）やコンクリートガラ（コンクリート塊）やアスファルトガラなどの硬い粗大物と、自然砂（天然砂）と、土とが含まれている（以下、これらを「土石類」と総称する。）。かかる残土には、一般に、鉄屑や木材など、土石物以外の異物（以下、これらを「非土石類」と総称する。）も含まれている。そこで、材料選別装置２は、残土から非土石類を除去する。例えば、鉄屑は磁石で吸着することにより除去することができる。また、木材は、一般に土石物に比べて細長いので、スクリーニングにより、あるいはフォークですくい上げることにより除去することができる。   This residual soil includes hard rocks such as natural rocks or stones (gravel), concrete gravel (concrete blocks) and asphalt gravel, natural sand (natural sand), and soil (hereinafter referred to as these). Collectively called “earth and stone”.) Such residual soil generally includes foreign matters other than debris such as iron scrap and wood (hereinafter collectively referred to as “non-debris”). Therefore, the material sorting apparatus 2 removes non-debris from the remaining soil. For example, iron scraps can be removed by adsorbing with a magnet. In addition, wood is generally slender compared to debris and can be removed by screening or scooping with a fork.

非土石類が除去された残土は、材料選別装置２から排出され、第１コンベア３によってローラミル４（破砕機）に搬入される。なお、第１コンベア３は、粗大物を含む残土を搬送することができるものであれば、どのようなものでもよく、例えばバケットコンベア、ベルトコンベアなどを用いることができる。   The residual soil from which the non-debris has been removed is discharged from the material sorting device 2 and carried into the roller mill 4 (crusher) by the first conveyor 3. The first conveyor 3 may be anything as long as it can transport the remaining soil including coarse materials. For example, a bucket conveyor or a belt conveyor can be used.

ローラミル４は、被破砕物を、回転するローラと、静止している壁面ないしは底面との間にかみ込ませて破砕ないしは粉砕する破砕機であり、例えば数百ミクロン以上の範囲で、容易に粒度の調整を行うことができるものである。なお、粒度の調整は、例えば、ローラの種類、ローラの位置、ローラの回転数等を適宜変えることにより容易に行うことができる。そして、ローラミル４は、硬い粗大物を破砕し、残土中の自然砂と近似する粒度分布ないしは粒度構成の砕砂（粒状物）を生成する。   The roller mill 4 is a crusher that crushes or crushes an object to be crushed between a rotating roller and a stationary wall surface or bottom surface. Can be adjusted. The adjustment of the particle size can be easily performed by appropriately changing the type of roller, the position of the roller, the number of rotations of the roller, and the like. And the roller mill 4 crushes a hard coarse thing, and produces | generates the crushed sand (granular material) of the particle size distribution thru | or particle size structure which approximates the natural sand in a residual soil.

粗大物が破砕された残土、すなわち、粒度分布が近似した（ほぼ同一である）自然砂及び砕砂（以下、これらを「複合砂」と総称する。）と、該複合砂より粒径が小さい（細かい）土とを含む残土は、ローラミル４から排出され、第２コンベア５によって篩分装置６に搬入される。第２コンベア５は、破砕された比較的細かい残土を搬送することができるものであれば、どのようなものでもよく、例えば、スクリューフィーダー、バケットコンベア、ベルトコンベアなどを用いることができる。   Residue soil from which coarse products are crushed, that is, natural sand and crushed sand (hereinafter, these are collectively referred to as “composite sand”) whose particle size distribution is approximate (substantially the same) is smaller than the composite sand ( The remaining soil including fine soil is discharged from the roller mill 4 and carried into the sieving device 6 by the second conveyor 5. The second conveyor 5 may be anything as long as it can transport the crushed relatively fine residual soil, and for example, a screw feeder, a bucket conveyor, a belt conveyor, or the like can be used.

篩分装置６は、目の大きさないしは粗さが互いに異なる複数のスクリーンを備えていて、残土を、予め設定された粒度範囲の複合砂（以下、「粒度調整砂」という。）と、この粒度調整砂よりも粒度が大きい（粗い）粗粒物と、粒度調整砂よりも粒度が小さい（細かい）微粒物とに篩い分ける。すなわち、残土を分級して該残土から粒度調整砂を選別・抽出する。   The sieving apparatus 6 includes a plurality of screens having different sizes or different sizes, and the remaining soil is a composite sand having a preset particle size range (hereinafter referred to as “particle size adjusted sand”), and this. Sieve into coarse particles having a particle size larger (coarse) than the particle size adjusted sand and fine particles having a particle size smaller (fine) than the particle size adjusted sand. That is, the remaining soil is classified and the particle size-adjusted sand is selected and extracted from the remaining soil.

ここで、粗粒物、すなわち粒度調整砂より粒度が大きい複合砂は、第３コンベア７（粗粒物戻し手段）によってローラミル４に戻され、再び破砕され、より粒度が小さい複合砂となる。第３コンベア７としては、例えばスクリューフィーダー、バケットコンベア、ベルトコンベアなどを用いることができる。なお、粗粒物をローラミル４に戻さず、建設材料（生コンクリート等）の骨材として用いてもよい。また、微粒物、すなわち粒度調整砂より粒度が小さい複合砂と土の混合物は、篩分装置６から排出され、建設材料や埋め立て材料などとして利用され、あるいは廃棄される。   Here, the coarse particles, that is, the composite sand having a larger particle size than the particle size-adjusted sand, is returned to the roller mill 4 by the third conveyor 7 (coarse particle returning means), and is crushed again to become a composite sand having a smaller particle size. As the 3rd conveyor 7, a screw feeder, a bucket conveyor, a belt conveyor etc. can be used, for example. The coarse particles may not be returned to the roller mill 4 but may be used as an aggregate of construction materials (such as ready-mixed concrete). Further, fine particles, that is, a mixture of composite sand and soil having a particle size smaller than that of the particle size adjusted sand, is discharged from the sieving device 6 and used as construction material, landfill material, or discarded.

粒度調整砂は、篩分装置６から排出された後、洗浄装置８に送られる。粒度調整砂は、洗浄装置８内において水で洗浄され、粒度調整砂に混入ないしは付着している微細なダスト等が除去され、製品砂となる。この製品砂は、生コンクリート用の砂、コンクリート二次製品用の砂、合材プラント用の砂、管まき用の砂、砂場用の砂などとして、天然砂と同様に幅広く用いることができるので、商品として販売することが可能である。   The particle size-adjusted sand is discharged from the sieving device 6 and then sent to the cleaning device 8. The particle size adjusted sand is washed with water in the cleaning device 8 to remove fine dust and the like mixed or adhered to the particle size adjusted sand and become product sand. This product sand can be used widely like natural sand, such as sand for ready-mixed concrete, sand for concrete secondary products, sand for compound plants, sand for pipes, sand for sandboxes, etc. It is possible to sell as a product.

このように、本発明にかかる製品砂製造プラントによれば、残土中の砂の含有量が少ない場合でも、該残土から、所望の粒度分布を伴った、生コンクリート用の砂、コンクリート二次製品用の砂、合材プラント用の砂、管まき用の砂、砂場用の砂などとして利用することができる十分な量の製品砂を製造することができる。   Thus, according to the product sand manufacturing plant according to the present invention, even when the sand content in the residual soil is small, the sand for ready-mixed concrete and the secondary concrete product with the desired particle size distribution are obtained from the residual soil. It is possible to produce a sufficient amount of product sand that can be used as sand for construction, sand for compound plants, sand for pipes, sand for sandboxes, and the like.

次の表１、２に、本発明にかかる方法により、アスファルトガラを含む残土から製造された分級前の複合砂（自然砂及び砕砂の混合物）の２種類のサンプル１、２について、ふるい目の異なる複数のふるいを用いてその粒度分布を測定した結果を示す。

Figure 2005342655
表１ 複合砂の粒度分布（サンプル１）
In the following Tables 1 and 2, two types of samples 1 and 2 of pre-classified composite sand (mixture of natural sand and crushed sand) produced from the residual soil containing asphalt gala by the method according to the present invention are sieved. The result of having measured the particle size distribution using several different sieves is shown.
Figure 2005342655
 Table 1 Particle size distribution of composite sand (Sample 1)

Figure 2005342655
Figure 2005342655
表２ 複合砂の粒度分布（サンプル２）Table 2 Particle size distribution of composite sand (Sample 2)

また、次の表３、４に、本発明にかかる方法により、アスファルトガラを含まない残土から製造された分級前の複合砂（自然砂及び砕砂の混合物）の２種類のサンプル３、４について、ふるい目の異なる複数のふるいを用いてその粒度分布を測定した結果を示す。

Figure 2005342655
表３ 複合砂の粒度分布（サンプル３）
Further, in the following Tables 3 and 4, with respect to the two types of samples 3 and 4 of the composite sand (mixture of natural sand and crushed sand) before classification produced from the residual soil not containing asphalt gala by the method according to the present invention, The result of measuring the particle size distribution using a plurality of sieves with different sieve meshes is shown.
Figure 2005342655
 Table 3 Particle size distribution of composite sand (Sample 3)

Figure 2005342655
Figure 2005342655
表４ 複合砂の粒度分布（サンプル４）Table 4 Particle size distribution of composite sand (Sample 4)

一般に、需要が多いのは粒径が０．６ｍｍ以下の製品砂であり、とくに需要が多いのは粒径が０．３〜０．６ｍｍの製品砂である。そして、表１、２から明らかなとおり、アスファルトガラを含む残土から製造された分級前の複合砂では、そのおよそ６５％は粒径が０．６ｍｍ以下である。また、およそ３０％は粒径が０．３〜０．６ｍｍである。他方、表３、４から明らかなとおり、アスファルトガラを含まない残土から製造された分級前の複合砂では、粒径が０．６ｍｍ以下のものはおよそ３６〜４６％であり、粒径が０．３〜０．６ｍｍのものはおよそ２０〜２６％である。したがって、アスファルトガラを含む残土を用いる場合は、アスファルトガラを含まない残土を用いる場合に比べて、より有用な製品砂をより多く製造することができるということが分かる。   In general, product sand having a particle size of 0.6 mm or less is in great demand, and product sand having a particle size of 0.3 to 0.6 mm is particularly in demand. As apparent from Tables 1 and 2, about 65% of the pre-classified composite sand produced from the residual soil containing asphalt gala has a particle size of 0.6 mm or less. Further, about 30% has a particle size of 0.3 to 0.6 mm. On the other hand, as is apparent from Tables 3 and 4, in the pre-classified composite sand produced from the residual soil containing no asphalt gala, those having a particle size of 0.6 mm or less are approximately 36 to 46%, and the particle size is 0. It is about 20 to 26% when the thickness is 3 to 0.6 mm. Therefore, when using the residual soil containing asphalt glass, it turns out that more useful product sand can be manufactured more compared with the case where the residual soil which does not contain asphalt glass is used.

なお、上記実施の形態にかかる製品砂製造プラントでは、篩分装置６は、残土を、１種類の粒度調整砂と、粗粒物と、微粒物とに篩い分けるようになっている。しかし、より多くのスクリーンを設けて、互いに粒度分布ないしは粒度構成が異なる複数種類（例えば、２種類、３種類……）の粒度調整砂を選別・抽出するようにしてもよい。なお、粒度調整砂の粒度範囲の下限を小さい値に設定すれば、複合砂のほとんど全部が製品砂となり、篩分装置６から排出される微粒物の大半は土で構成されることになる。   In the product sand manufacturing plant according to the above-described embodiment, the sieving device 6 is configured to screen the residual soil into one type of particle size-adjusted sand, coarse particles, and fine particles. However, a larger number of screens may be provided to select / extract a plurality of types (for example, two types, three types,...) Of particle size-adjusted sand having different particle size distributions or particle size configurations. If the lower limit of the particle size range of the particle size adjusted sand is set to a small value, almost all of the composite sand becomes product sand, and most of the fine particles discharged from the sieving device 6 are made of soil.

また、上記実施の形態にかかる製品砂製造プラントでは、洗浄装置８を用いて粒度調整砂を水で洗浄することによりダストを除去し、高品質の製品砂を得るようにしている（湿式）。しかし、水を用いずに、エアブロー等でダストを除去するようにしてもよい（乾式）。また、製品砂の品質上とくに問題がなければ、ダストの除去を省略してもよい。   Moreover, in the product sand manufacturing plant concerning the said embodiment, dust is removed by wash | cleaning a particle size adjustment sand with water using the washing | cleaning apparatus 8, and high quality product sand is obtained (wet type). However, dust may be removed by air blow or the like without using water (dry type). If there is no particular problem with the quality of the product sand, the removal of dust may be omitted.

本発明にかかる製品砂製造プラントの構成を示す模式図である。It is a schematic diagram which shows the structure of the product sand manufacturing plant concerning this invention.

符号の説明Explanation of symbols

１ 製品砂製造プラント
２ 材料選別装置
３ ローラミル
４ 篩分装置
５ 洗浄装置
６ 第１コンベア
７ 第２コンベア
８ 第３コンベア
1 Product Sand Production Plant 2 Material Sorting Device 3 Roller Mill 4 Sieving Device 5 Cleaning Device 6 First Conveyor 7 Second Conveyor 8 Third Conveyor

Claims (6)

岩石、コンクリートガラ及び／又はアスファルトガラ等の硬い粗大物と、砂と、土とを含む残土を受け入れ、該残土中の上記粗大物を破砕して上記砂と近似する粒度の粒状物を生成する破砕機と、
上記破砕機から排出された上記砂と上記土と上記粒状物とを含む混合物を分級し、所望の粒度の上記砂及び上記粒状物を含む混合物を製品砂として抽出する分級機とを備えていることを特徴とする製品砂の製造装置。 Receiving hard coarse material such as rock, concrete glass and / or asphalt glass, sand, and residual soil containing soil, and crushing the coarse material in the residual soil to produce granular material having a particle size approximating that of the sand. A crusher,
A classifier that classifies the mixture containing the sand, the soil, and the granular material discharged from the crusher, and extracts the sand having a desired particle size and the mixture containing the granular material as product sand; Product sand production equipment characterized by the above. 上記分級機から排出される上記製品砂よりも粒度が大きい粒状物を上記破砕機に戻す粗粒物戻し手段を備えていることを特徴とする、請求項１に記載の製品砂の製造装置。   The apparatus for producing product sand according to claim 1, further comprising a coarse product returning means for returning a granular material having a particle size larger than that of the product sand discharged from the classifier to the crusher. 上記分級機から排出された製品砂に混入しているダストを除去するダスト除去手段を備えていることを特徴とする、請求項１又は２に記載の製品砂の製造装置。   The apparatus for producing product sand according to claim 1 or 2, further comprising dust removing means for removing dust mixed in the product sand discharged from the classifier. 上記破砕機がローラミルであることを特徴とする、請求項１〜３のいずれか１つに記載の製品砂の製造装置。   The apparatus for producing product sand according to any one of claims 1 to 3, wherein the crusher is a roller mill. 上記分級機が、目の粗さが互いに異なる複数のスクリーンを用いた乾式篩分機であることを特徴とする、請求項１〜４のいずれか１つに記載の製品砂の製造装置。   The apparatus for producing product sand according to any one of claims 1 to 4, wherein the classifier is a dry sieving machine using a plurality of screens having different meshes. 破砕機を用いて、岩石、コンクリートガラ及び／又はアスファルトガラ等の硬い粗大物と、砂と、土とを含む残土中の上記粗大物を破砕して上記砂と近似する粒度の粒状物を生成し、
分級機を用いて、上記砂と上記土と上記粒状物とを含む混合物を分級し、所望の粒度の上記砂及び上記粒状物を含む混合物を製品砂として抽出することを特徴とする製品砂の製造方法。

Using a crusher, crush the coarse material in the residual soil, including rocks, concrete and / or asphalt grit, and sand and soil to produce granules with a particle size approximating that of the sand. And
A classifier is used to classify the mixture containing the sand, the soil, and the granular material, and the sand having a desired particle size and the mixture containing the granular material are extracted as product sand. Production method.

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