JPH05161854A - Preparation of crushed sand for concrete - Google Patents
Preparation of crushed sand for concreteInfo
- Publication number
- JPH05161854A JPH05161854A JP33417191A JP33417191A JPH05161854A JP H05161854 A JPH05161854 A JP H05161854A JP 33417191 A JP33417191 A JP 33417191A JP 33417191 A JP33417191 A JP 33417191A JP H05161854 A JPH05161854 A JP H05161854A
- Authority
- JP
- Japan
- Prior art keywords
- sand
- cylindrical drum
- water
- stones
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Crushing And Grinding (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート用砕砂の
製造方法に係り、詳しくは、回転する筒状ドラム内で媒
体石と原砂と水とを攪拌させることによりコンクリート
用砕砂を得るようにした製造方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing crushed sand for concrete, more specifically, to obtain crushed sand for concrete by stirring medium stone, raw sand and water in a rotating cylindrical drum. To the improvement of the manufacturing method.
【０００２】[0002]
【従来の技術】従来より、コンクリート用の砕砂を製造
するための装置として、ロッドミルと称せられる装置が
公知となっているが、このロッドミルは、筒状ドラムの
内部攪拌室に複数本の金属製ロッドを転動可能に収納
し、この中に原砂及び水を供給して筒状ドラムを回転さ
せることにより、前記金属製ロッドの衝撃力により原砂
を強制的に破砕して、砕砂を得るように構成したもので
ある。しかしながら、前記金属製ロッドの硬度は原砂の
硬度よりも遥かに大きく、このため金属製ロッドから原
砂に付与される衝撃力は極めて大きなものになることに
加えて、この金属製ロッドは、単に原砂を打ち砕くに過
ぎないものであって若干の摩擦的作用を行えるに留ま
り、原砂の表面を除々に摩砕していくといった作用は当
然の事ながら行い得ないため、ロッドミルを使用して製
造された砕砂は、コンクリートの主要原料である細骨材
としては、極めて品質の低いものとなる。具体的には、
天然に存在する川砂、山砂、海砂或いは陸砂等のうち、
硬質で且つ粒形が球形に近い川砂が細骨材として最も品
質の良いものであることが知られており、この川砂の水
洗した試料 JIS A 5004 による粒形判定実績率（単位容
積質量を絶乾比重で除算した値）は５７〜５９％という
好適な数値を示すのに対し、前記ロッドミルにより得ら
れた砕砂の粒形判定実績率は５３％前後であることが実
験により判明している。そして、ロッドミルにより得ら
れた砕砂は、粒形が球状でなく偏平で角立っており、表
面（肌）がなめらかでなく、而もクラックが発生してい
る等の諸種なる欠点を有しており、ワーカビリチーや流
動性等のコンクリートの諸性質に悪影響を及ぼすもので
あった。2. Description of the Related Art Conventionally, an apparatus called a rod mill has been known as an apparatus for producing crushed sand for concrete, but this rod mill is equipped with a plurality of metallic members in an internal stirring chamber of a cylindrical drum. The rod is housed in a rollable manner, the raw sand and water are supplied into the rod, and the cylindrical drum is rotated to forcibly crush the raw sand by the impact force of the metal rod to obtain crushed sand. It is configured as follows. However, the hardness of the metal rod is much higher than the hardness of the raw sand, and therefore the impact force applied to the raw sand from the metal rod becomes extremely large. Since it is merely crushing the raw sand and can only perform some frictional action, it cannot naturally perform the action of gradually grinding the surface of the raw sand. The crushed sand produced in this way is of extremely low quality as fine aggregate, which is the main raw material for concrete. In particular,
Of natural river sand, mountain sand, sea sand or land sand, etc.
It is known that river sand, which is hard and whose grain shape is close to spherical, has the highest quality as fine aggregate, and the rate of grain shape determination according to JIS A 5004, a washed water sample of this river sand ( The value obtained by dividing by dry specific gravity) is 57 to 59%, while the crushed sand obtained by the rod mill has a grain shape determination performance rate of about 53%. And, the crushed sand obtained by the rod mill has various defects such that the grain shape is not spherical but flat and angular, the surface (skin) is not smooth, and cracks are generated. , The workability and fluidity of the concrete are adversely affected.
【０００３】このような問題に対処すべく、本出願人
は、先の特許出願（特開平２−２２２７３６号〔米国特
許第４９９５５６１号〕）において、以下のようにして
砕砂を製造することを提案した。即ち、図１に示すよう
に、筒状ドラム１の内部攪拌室２に複数の媒体石３…３
を積重した状態で、この中に原砂４及び水５を連続的に
送給すると共に、筒状ドラム１を駆動装置の動作により
回転させて、内部攪拌室２で媒体石３…３、原砂４及び
水５を攪拌し、且つ、この攪拌作用により生成された砕
砂６を水と共に排出口７より連続的に取り出すようにし
たものである。これによれば、媒体石、原砂及び水が攪
拌されることにより川砂の生成課程と略同一の条件の下
で、原砂の表面全体が摩砕されることになるので、原砂
の表面に付着している不純物等が除去され、更には川砂
の有する種々の利点、つまり粒形が球形に近く偏平でな
く且つ表面がなめらかであり而もクラックが発生してい
ない等の利点を全て兼ね備えた砕砂が短時間で得られる
ことになる。In order to deal with such a problem, the applicant of the present invention proposes to produce crushed sand as follows in the previous patent application (JP-A-2-222736 [US Pat. No. 4,995,561]). did. That is, as shown in FIG. 1, a plurality of medium stones 3 ... 3 are provided in the internal stirring chamber 2 of the cylindrical drum 1.
In the state of being stacked, the raw sand 4 and the water 5 are continuously fed thereinto, and the cylindrical drum 1 is rotated by the operation of the driving device so that the medium stones 3 ... The raw sand 4 and the water 5 are stirred, and the crushed sand 6 generated by this stirring action is continuously taken out together with the water from the discharge port 7. According to this, the medium stone, the raw sand, and the water are agitated, so that the entire surface of the raw sand is ground under the same conditions as the generation process of the river sand. It has all the advantages that river sand has various advantages, such as the removal of impurities and the like, and the fact that the grain shape is close to a sphere and is not flat and the surface is smooth and cracks do not occur. The crushed sand will be obtained in a short time.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記本
出願人の提案によるコンクリート用砕砂製造手段による
にしても、より良質の砕砂の製造を行うには、未だ解決
すべき問題点がある。即ち、筒状ドラム１の内部攪拌室
２に積重される媒体石３…３の量は、過少であっても過
多であっても原砂４…４に対して良好な摩砕作用を行い
得ず、また一旦適切な量としていても媒体石３…３が攪
拌に伴って摩滅していくため、時間経過と共に過少状態
に陥るという難点がある。また、筒状ドラム１の単位時
間当りの回転数に関しては、回転数が過大であると媒体
石３…３が筒状ドラム１内周面に沿って上部まで持ち上
げられてしまい摩擦的効果が得られなくなる一方、回転
数が過小であると原砂４…４が筒状ドラム１の軸方向に
対して良好に移動できず、従って投入された原砂４…４
が排出口７に向かってスムーズに流れなくなるという問
題がある。更に、原砂４…４の投入量と水５の投入量と
の関係も極めて重要な要因であり、この関係が適切でな
いと攪拌時における原砂４…４の流動性等が所要のもの
とならず、原砂４…４と媒体石３…３とが均等に混じり
合わない等の問題が生じる。However, even if the crushed sand manufacturing means for concrete proposed by the present applicant is used, there are still problems to be solved in order to manufacture crushed sand of higher quality. That is, the amount of the medium stones 3 ... 3 stacked in the internal stirring chamber 2 of the cylindrical drum 1 is not too small or too large, and the raw sand 4 ... 3 is not obtained, and even if the amount is once appropriate, the medium stones 3 ... 3 are abraded with stirring, so that there is a problem that the state becomes too small with the lapse of time. Regarding the number of rotations of the cylindrical drum 1 per unit time, if the number of rotations is too large, the medium stones 3 ... 3 are lifted to the upper part along the inner peripheral surface of the cylindrical drum 1 to obtain a frictional effect. On the other hand, if the number of rotations is too small, the raw sand 4 ... 4 cannot be moved well in the axial direction of the cylindrical drum 1, and therefore the input raw sand 4 ... 4.
Has a problem in that it does not flow smoothly toward the discharge port 7. Furthermore, the relationship between the input amount of the raw sands 4 ... 4 and the input amount of the water 5 is also an extremely important factor, and if this relationship is not appropriate, the fluidity of the raw sands 4 ... 4 during stirring is required. As a result, there arises a problem that the raw sands 4 ... 4 and the medium stones 3 ... 3 are not uniformly mixed.
【０００５】本発明者は、コンクリート用砕砂の製造方
法について鋭意研究を続けた結果、筒状ドラムの大きさ
と媒体石の量との関係、筒状ドラムの大きさと回転数と
の関係、原砂と水との投入量の関係が、高品質のコンク
リート用砕砂を製造する上で極めて重要な要因であるこ
とを知見し、本発明を完成するに至ったものである。従
って、本発明は、上記の各要因を最も適切なものとする
ことにより、コンクリート用砕砂の製造工程を改善し、
もって高品質の砕砂を得ることを技術的課題とするもの
である。The present inventor has conducted extensive studies on a method for producing crushed sand for concrete. As a result, the relationship between the size of the cylindrical drum and the amount of medium stones, the relationship between the size of the cylindrical drum and the number of revolutions, and the raw sand It was found that the relationship between the input amount of water and water is an extremely important factor in producing high-quality crushed sand for concrete, and the present invention has been completed. Therefore, the present invention improves the manufacturing process of crushed sand for concrete by making each of the above factors most appropriate,
The technical issue is to obtain high quality crushed sand.
【０００６】[0006]
【課題を解決するための手段】上記技術的課題を達成す
べくなされた本発明に係るコンクリート用砕砂の製造方
法は、以下に示すような特徴を有するものである。即
ち、筒状ドラムの内部攪拌室に複数の媒体石を積重した
状態で、該内部攪拌室に原砂及び水を投入すると共に、
前記筒状ドラムを駆動装置の動作により回転させ、これ
により前記内部攪拌室で媒体石、原砂及び水を攪拌し、
この攪拌作用により得られた砕砂を水と共に内部攪拌室
より取り出すようにしたコンクリート用砕砂の製造方法
において、前記複数の媒体石の量を、筒状ドラムの内周
面の直径の１／４乃至１／３の高さ範囲内に維持させる
ものである。そして好ましくは、筒状ドラムの内周面の
直径が大きくなるに従って該筒状ドラムの回転数を小さ
くするものであり、また原砂の投入量の増減に比例若し
くは略比例して水の投入量を増減させるものである。The method for producing crushed sand for concrete according to the present invention, which has been made to achieve the above technical problems, has the following features. That is, while stacking a plurality of medium stones in the internal stirring chamber of the cylindrical drum, while adding raw sand and water to the internal stirring chamber,
The cylindrical drum is rotated by the operation of a driving device, thereby stirring the medium stone, raw sand and water in the internal stirring chamber,
In the method for producing crushed sand for concrete in which crushed sand obtained by this stirring action is taken out from an internal stirring chamber together with water, the amount of the plurality of medium stones is set to 1/4 to 1/4 of the diameter of the inner peripheral surface of the cylindrical drum. It is to be maintained within the height range of 1/3. And, preferably, the number of rotations of the cylindrical drum is decreased as the diameter of the inner peripheral surface of the cylindrical drum is increased, and the amount of water input is proportional or approximately proportional to the increase or decrease in the amount of raw sand input. To increase or decrease.
【０００７】[0007]
【作用】上記手段によると、所定の粒度分布となるよう
に選択された複数の媒体石を筒状ドラムの内部に収納
し、この媒体石及び水により原砂に対して摩砕作用を行
わせるのであるが、この媒体石を積重させる量は、筒状
ドラムの内周面の直径の１／４乃至１／３の高さ範囲内
とする。つまり、筒状ドラムの内周面における最低部か
ら計測して内周面直径の１／４乃至１／３の高さまで媒
体石を積重させるのである。そして、攪拌に伴って媒体
石が摩滅してその積重上面位置が低くなった場合には、
媒体石を追加投入して内周面直径の１／４以下とならな
いようにし、また追加投入時には内周面直径の１／３以
上とならないようにする。これにより、媒体石は常に内
周面直径の１／４乃至１／３の高さ範囲内に維持される
こととなる。そして、設置スペース上の問題や設備費の
問題等により、筒状ドラムの大きさを変える必要性が生
じる場合があるが、このような場合には、筒状ドラムの
内周面直径が大きくなるに従って該筒状ドラムの回転数
を小さくすることにより、筒状ドラム内周面の周速度が
常に最適な速度となり、原砂及び媒体石が必要以上に上
部に持ち上げられたり或いは持ち上げ量が不足したり等
の不具合が回避される。また、筒状ドラムより取り出さ
れるコンクリート用砕砂の量を増加させようとする場合
には、原砂の投入量を増加させる必要があるが、このよ
うな場合には、原砂の投入量の増加に比例若しくは略比
例して水の投入量を増加させることにより、筒状ドラム
内部の原砂の流動性等を適切な状態とし、媒体石から原
砂に対して均等な摩砕作用を行わせて、品質にバラツキ
のないコンクリート用砕砂を製造するものである。According to the above means, a plurality of medium stones selected so as to have a predetermined particle size distribution are housed inside a cylindrical drum, and the medium stones and water cause the raw sand to be ground. However, the amount by which the medium stones are stacked is within a height range of 1/4 to 1/3 of the diameter of the inner peripheral surface of the cylindrical drum. That is, medium stones are piled up to a height of ¼ to ⅓ of the inner peripheral surface diameter measured from the lowest portion on the inner peripheral surface of the cylindrical drum. Then, when the medium stones are worn away with stirring and the stacking upper surface position becomes low,
Medium stones are additionally charged so that the diameter does not fall below 1/4 of the inner peripheral surface diameter, and at the time of additional charging, it does not exceed 1/3 of the inner peripheral diameter. As a result, the medium stone is always maintained within the height range of 1/4 to 1/3 of the inner peripheral surface diameter. Then, it may be necessary to change the size of the cylindrical drum due to a problem of installation space, a problem of equipment cost, etc. In such a case, the inner peripheral surface diameter of the cylindrical drum becomes large. By reducing the number of rotations of the cylindrical drum in accordance with the above, the peripheral speed of the inner peripheral surface of the cylindrical drum is always the optimum speed, and the raw sand and the medium stone are lifted to the upper part more than necessary or the lifting amount is insufficient. Problems such as sticking are avoided. In addition, when increasing the amount of crushed sand for concrete taken out from the cylindrical drum, it is necessary to increase the input amount of raw sand.In such a case, increase the input amount of raw sand. By increasing the amount of water input in proportion to or approximately in proportion to, the fluidity etc. of the raw sand inside the cylindrical drum is made to be an appropriate state, and an even grinding action is performed from the medium stone to the raw sand. In this way, crushed sand for concrete with consistent quality is manufactured.
【０００８】[0008]
【実施例】以下、本発明の実施例について述べるが、こ
の実施例は、本発明を限定する趣旨のものではない。先
ず、予備段階として、砕石製造プラント等で生成された
砕石に所定の加工を施すことに得られた丸みをおびた複
数の媒体石を、粒度が１００〜８０mmである第１のグル
ープと、粒度が８０〜６０mmである第２のグループと、
粒度が６０〜４０mmである第３のグループと、粒度が４
０〜２０mmである第４のグループと、粒度が２０〜１３
mmである第５のグループとに仕分けする。そして、この
各グループから、重量％が、第１のグループが５％、第
２のグループが１２．５％、第３のグループが２０％、
第４のグループが２７．５％、第５のグループが３５％
となるように各媒体石を選択的に取り出して合成する。EXAMPLES Examples of the present invention will be described below, but the examples are not intended to limit the present invention. First, as a preliminary step, a plurality of rounded medium stones obtained by subjecting a crushed stone produced in a crushed stone manufacturing plant or the like to a predetermined process are provided with a first group having a grain size of 100 to 80 mm and a grain size of 100 to 80 mm. With a second group of 80 to 60 mm,
A third group with a particle size of 60-40 mm and a particle size of 4
A fourth group of 0 to 20 mm and a grain size of 20 to 13
mm and the fifth group. From each of these groups, the weight% is 5% for the first group, 12.5% for the second group, and 20% for the third group.
27.5% in 4th group, 35% in 5th group
Each medium stone is selectively taken out so that
【０００９】上記のようにして合成された媒体石を、既
述の「従来の技術」の欄で述べたものと同一の砕砂製造
装置の筒状ドラムの内部に積み重ね、原砂及び水と共に
攪拌させるのであるが、この場合の媒体石を積み重ねる
量は、図２に示すように、筒状ドラムの内周面直径Ｌの
１／３乃至１／４の高さ範囲内とする。つまり、媒体石
の積重上面が同図に斜線部Ｍで示した範囲内に収まるよ
うにするのである。従って、筒状ドラムの回転による攪
拌に伴って媒体石が摩滅して下限（Ｌの１／４）に達し
た場合には別途媒体石を補充して下限以下とならないよ
うにし、また補充時には媒体石の量が上限（Ｌの１／
３）を超えないようにし、これによりＬの１／３乃至１
／４の範囲内に収まるようにする。これは、媒体石の量
が上記の範囲を逸脱した場合には、良好な攪拌作用を行
い得ず、例えば媒体石の量が多過ぎる場合には媒体石の
移動が拘束されてしまい、最適な攪拌を行うための充分
な移動が阻止され、また媒体石の量が少な過ぎる場合に
は媒体石から原砂に作用する押圧力がばらついたり或い
は重量不足等により最適な摩砕作用を行い得なくなると
いう理由によるものである。この場合、前記原砂として
は、粒径が５mm以下の海砂、山砂、砕石場で採取された
ダスト等が使用される。The medium stones synthesized as described above are stacked inside a cylindrical drum of the same crushed sand manufacturing apparatus as described in the above-mentioned "Prior art" section, and stirred with raw sand and water. The amount of medium stones stacked in this case is within the range of 1/3 to 1/4 of the inner peripheral surface diameter L of the cylindrical drum, as shown in FIG. That is, the stacking upper surface of the medium stones is set within the range shown by the hatched portion M in FIG. Therefore, when the medium stone is worn down and reaches the lower limit (1/4 of L) with stirring by the rotation of the cylindrical drum, the medium stone is supplemented so that the medium stone does not fall below the lower limit. The amount of stones is the upper limit (1 / L
3), so that 1/3 to 1 of L
It should be within the range of / 4. This is because when the amount of medium stones deviates from the above range, good stirring action cannot be performed, and for example, when the amount of medium stones is too large, the movement of medium stones is restricted, and the optimum If the amount of medium stones is too small, the sufficient movement for stirring is prevented, and if the amount of medium stones acts on the raw sand, the pressing force will vary or the weight will be insufficient, etc. The reason is that. In this case, as the raw sand, sea sand having a grain size of 5 mm or less, mountain sand, dust collected at a quarry, or the like is used.
【００１０】水及び原砂の投入量に関しては、筒状ドラ
ムの内部に原砂と水とを連続的に投入しながら該筒状ド
ラムを回転させ、この状態での原砂の投入量と水の投入
量とを適宜変化させて、原砂の流動性等の状態を判別す
るという実験を行った結果、図３のグラフに示すよう
に、原砂の投入量と水の投入量とは比例若しくは略比例
関係にあることが最適であることを知見した。この図３
のグラフに示す関係は、筒状ドラムの大きさや回転数が
変化しても、不変のものである。Regarding the amounts of water and raw sand to be fed, while the raw sand and water are continuously fed into the inside of the tubular drum, the tubular drum is rotated, and the amount of raw sand and the amount of water fed in this state are set. As a result of an experiment in which the state such as the fluidity of the raw sand is determined by appropriately changing the input amount of the raw sand, as shown in the graph of FIG. 3, the input amount of the raw sand is proportional to the input amount of water. Alternatively, they have found that it is optimal to have a substantially proportional relationship. This Figure 3
The relationship shown in the graph is invariable even if the size or the rotation speed of the cylindrical drum changes.
【００１１】そして、筒状ドラムの内部に媒体石をＬの
約１／３まで投入した状態で、回転数２６rpm で筒状ド
ラムを回転させ、この状態での水の通過時間つまり筒状
ドラムの内部に水を投入してから排出口より取り出され
るまでの時間を測定した。この測定に際しては、直径が
１２０cm（内径が１１６．５cm）で長さが２００cmであ
る筒状ドラムを使用し、この筒状ドラムの中に高さ３５
cmまで計９３０kgの媒体石を積重させた。この測定結果
を図４のグラフに示す。Then, in a state in which the medium stone is charged into the cylindrical drum up to about 1/3 of L, the cylindrical drum is rotated at a rotation speed of 26 rpm, and the water passage time in this state, that is, the cylindrical drum The time from when water was added to the inside until it was taken out from the outlet was measured. At the time of this measurement, a cylindrical drum having a diameter of 120 cm (inner diameter of 116.5 cm) and a length of 200 cm was used.
A total of 930 kg of medium stones were piled up to cm. The measurement result is shown in the graph of FIG.
【００１２】次いで、この測定結果である水の通過時間
と、筒状ドラムの円周と、該ドラムの回転数とを乗じる
ことにより、水の通過距離を算出する。この算出結果
を、図５のグラフに示す。そして、この図５に示す水の
通過距離の中から、実際に原砂、媒体石及び水を筒状ド
ラムの内部で攪拌することにより得られた砕砂がJIS A5
004の規格を満し且つJIS A 5308の規格に合致するよう
になるための水の通過距離を決定する。この結果、１０
０ｍ〜１５０ｍの通過距離が最適であることを知見し
た。ここで、上記のJIS A 5004については既述の「従来
の技術」の欄で述べたところであり、またJIS A 5308
は、アルカリシリカ反応性試験の結果が無害であるか否
かを判別するためのものであり、JIS A 5308-1989 付属
書７「骨材のアルカリシリカ反応性試験方法（化学
法）」や、同付属書８「骨材のアルカリシリカ反応性試
験方法（モルタルバー法）」がある。そして、このアル
カリシリカ反応性試験の結果が無害でない場合には、セ
メントのアルカリと化合して膨張し、コンクリートを崩
壊させたり、或いは鉄筋コンクリート使用の場合には鉄
筋が腐食する等の不具合を招く。従って、実際の攪拌に
先立って、前記媒体石に対しても、アルカリシリカ反応
性試験を行っておくことが好ましい。Next, the water passage distance is calculated by multiplying the water passage time, which is the result of this measurement, the circumference of the cylindrical drum, and the rotational speed of the drum. The calculation result is shown in the graph of FIG. Then, the crushed sand obtained by actually stirring the raw sand, the medium stone and the water inside the cylindrical drum from the passage distance of the water shown in FIG. 5 is JIS A5.
Determine the water passage distance to meet the 004 standard and meet the JIS A 5308 standard. As a result, 10
It has been found that a passing distance of 0 m to 150 m is optimal. Here, the above JIS A 5004 has been described in the above-mentioned "Prior Art" column, and also JIS A 5308.
Is for determining whether or not the result of the alkali silica reactivity test is harmless. For example, JIS A 5308-1989 Appendix 7 “Aggregate alkali silica reactivity test method (chemical method)”, There is Annex 8 “Alkali-silica reactivity test method for aggregates (mortar bar method)”. If the result of the alkali-silica reactivity test is not harmless, it causes a problem such that it is combined with the alkali of the cement and expands to collapse the concrete, or in the case of using reinforced concrete, the reinforcing bar corrodes. Therefore, prior to the actual stirring, it is preferable to perform the alkali-silica reactivity test on the medium stone as well.
【００１３】実際に攪拌を行うに際して、例えば２０ｔ
／ｈの投砂量とする場合には、図３のグラフに基づいて
投水量を６．５ｔ／ｈとし、図４のグラフにより水の通
過時間が約３７秒であり且つ図５のグラフにより水の通
過距離が約６０ｍであることを知得する。この場合、水
の通過距離は記述のように１００ｍ〜１５０ｍとするの
が最適であることから、投砂量が２０ｔ／ｈで投水量が
６．５ｔ／ｈの場合には、一度筒状ドラムの排出口から
取り出された砕砂を、再度同様の筒状ドラムに投入して
排出口より取り出せば、水の通過距離は計算上１２０ｍ
となり、上記の最適範囲内に収まることになる。このよ
うに、水の通過距離が１００ｍ〜１５０ｍの範囲内に収
まるような条件下で、実際に原砂と媒体石と水とを攪拌
させることにより、高品質の砕砂が得られるのである。When actually stirring, for example, 20 t
In the case of a sand throw rate of / h, the water throw rate is set to 6.5 t / h based on the graph of FIG. 3, the water passage time is about 37 seconds according to the graph of FIG. 4, and the graph of FIG. It is known that the distance that water passes is about 60 m. In this case, the water passage distance is optimally set to 100 m to 150 m as described, so if the sand throwing amount is 20 t / h and the water throwing amount is 6.5 t / h, the tubular drum is once used. If the crushed sand taken out from the discharge port is put into the same cylindrical drum again and taken out from the discharge port, the water passage distance is calculated to be 120 m.
Therefore, it falls within the above optimum range. In this way, high-quality crushed sand can be obtained by actually stirring the raw sand, the medium stones, and water under the condition that the water passage distance falls within the range of 100 m to 150 m.
【００１４】また、上記の測定に際しては、直径が１２
０cmの筒状ドラムを使用したために回転数を２６rpm と
したが、例えば直径が６０cmの筒状ドラムを使用する場
合には回転数を２７rpm とするのが最適である。これ
は、筒状ドラムの回転数を必要以上に大きくした場合に
は、筒状ドラム内周面の周速度が大きくなって媒体石が
所要以上の上部まで持ち上げられてしまい、衝撃力のみ
が過度に大きくなって摩擦的作用が行われなくなり、ま
た回転数を必要以上に小さくした場合には、周速度が不
足して原砂の通過に異常が生じるという理由によるもの
である。従って、筒状ドラム内周面の周速度が適切な値
となるように、筒状ドラムの直径に応じて回転数を変化
させる必要がある。この場合において、上記のように直
径が６０cmの筒状ドラムを使用する場合には、その内部
に上記と同様にして媒体石を積重させて回転数２７rpm
で筒状ドラムを回転させ、この状態での水の通過時間を
測定し、この水の通過時間と投水量との関係を別途グラ
フに表し、更にこの水の通過時間と筒状ドラムの円周及
び回転数を乗じることにより、投水量と水の通過距離と
の関係を算出し、この算出結果を別途グラフに表す。そ
して、前記図３のグラフから投砂量に対する投水量を決
定し、前記別途作成したグラフに基づいて、水の通過距
離が１００ｍ〜１５０ｍの範囲内に収まるようにする。
このようにすれば、上記と同様に、生成された砕砂が、
JIS A 5004の規格を満たし且つJIS A 5308の規格に合致
することとなる。In the above measurement, the diameter is 12
The rotation speed was set to 26 rpm because the cylindrical drum having a diameter of 0 cm was used. However, when the cylindrical drum having a diameter of 60 cm is used, the rotation speed is optimally set to 27 rpm. This is because when the rotational speed of the cylindrical drum is increased more than necessary, the peripheral velocity of the inner peripheral surface of the cylindrical drum increases and the medium stones are lifted to the upper part more than necessary, and only the impact force is excessive. This is because the frictional action is not performed and the rotation speed is reduced more than necessary, the peripheral speed is insufficient and the passage of the raw sand becomes abnormal. Therefore, it is necessary to change the rotational speed according to the diameter of the cylindrical drum so that the peripheral speed of the inner peripheral surface of the cylindrical drum becomes an appropriate value. In this case, when using the cylindrical drum having a diameter of 60 cm as described above, the medium stones are stacked in the same manner as described above and the rotation speed is 27 rpm.
The cylindrical drum is rotated with to measure the water passage time in this state, and the relationship between this water passage time and the amount of water thrown is shown in a separate graph. And the number of revolutions are multiplied to calculate the relationship between the water flow rate and the water passage distance, and the calculation result is shown in a separate graph. Then, the amount of water thrown with respect to the amount of sand thrown is determined from the graph of FIG. 3, and the passage distance of water is set within the range of 100 m to 150 m based on the graph created separately.
In this way, the generated crushed sand, like the above,
It meets the JIS A 5004 standard and meets the JIS A 5308 standard.
【００１５】[0015]
【発明の効果】以上のように本発明に係るコンクリート
用砕砂の製造方法によれば、筒状ドラムの内部に積み重
ねられる媒体石の量を、その上限を筒状ドラム内周面直
径の１／３とし且つその下限を筒状ドラム内周面直径の
１／４とし、この両者間に常に収まるようにしたから、
原砂に対する摩砕的作用が最適な状態で行われることと
なり、高品質のコンクリート用砕砂を得る上で大きく役
立つことになる。また、筒状ドラムの内周面直径と回転
数との関係を適切なものとしたことにより、内周面の周
速度が最適値となって、媒体石が内周面に沿って適度な
高さまで持ち上げられた時点で滑落することとなり、原
砂に対する好適な摩擦的効果が得られることになる。更
に、原砂の投入量と水の投入量との関係を適切なものと
したことにより、攪拌時における原砂の流動性等の諸状
態が好適なものとなり、媒体石による摩砕作用の能率が
一層向上することになる。As described above, according to the method for producing crushed sand for concrete according to the present invention, the upper limit of the amount of medium stones piled up inside the cylindrical drum is 1 / the diameter of the inner peripheral surface of the cylindrical drum. 3 and the lower limit thereof is set to 1/4 of the inner peripheral surface diameter of the cylindrical drum so that the inner diameter is always set between the two
The milling action on the raw sand is performed in an optimum state, which is very useful for obtaining high-quality crushed sand for concrete. In addition, by making the relationship between the diameter of the inner peripheral surface of the cylindrical drum and the number of rotations appropriate, the peripheral speed of the inner peripheral surface becomes an optimum value, and the medium stones have an appropriate height along the inner peripheral surface. When it is lifted up to that point, it will slide off, and a favorable frictional effect on the raw sand will be obtained. Furthermore, by making the relationship between the input amount of raw sand and the input amount of water appropriate, various conditions such as the fluidity of the raw sand at the time of stirring become suitable, and the efficiency of the grinding action by the medium stone is improved. Will be further improved.
【図１】本発明方法の実施に際して使用される装置を示
す縦断正面図である。FIG. 1 is a vertical sectional front view showing an apparatus used for carrying out a method of the present invention.
【図２】本発明方法を説明するための概略側面図であ
る。FIG. 2 is a schematic side view for explaining the method of the present invention.
【図３】水の投入量と原砂の投入量との関係を示すグラ
フである。FIG. 3 is a graph showing the relationship between the amount of water input and the amount of raw sand input.
【図４】投入された水の通過時間を示すグラフである。FIG. 4 is a graph showing a passage time of introduced water.
【図５】水の投入量と通過時間との関係を示すグラフで
ある。FIG. 5 is a graph showing the relationship between the amount of water input and the passage time.
１ 筒状ドラム ３ 媒体石 ４ 原砂 ５ 水 ６ 砕砂 Ｌ 筒状ドラムの内周面の直径 1 Cylindrical drum 3 Medium stone 4 Raw sand 5 Water 6 Crushed sand L Diameter of inner peripheral surface of cylindrical drum
【手続補正書】[Procedure amendment]
【提出日】平成４年１月１４日[Submission date] January 14, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図５[Name of item to be corrected] Figure 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図５】水の投入量と通過距離との関係を示すグラフで
ある。FIG. 5 is a graph showing the relationship between the amount of water input and the passage distance .
Claims (3)
を積重した状態で、該内部攪拌室に原砂及び水を投入す
ると共に、前記筒状ドラムを駆動装置の動作により回転
させ、これにより前記内部攪拌室で媒体石、原砂及び水
を攪拌し、この攪拌作用により得られた砕砂を水と共に
内部攪拌室より取り出すようにしたコンクリート用砕砂
の製造方法において、前記複数の媒体石の量を、筒状ド
ラムの内周面の直径の１／４乃至１／３の高さ範囲内に
維持させるようにしたことを特徴とするコンクリート用
砕砂の製造方法。1. In a state in which a plurality of medium stones are stacked in an inner stirring chamber of a cylindrical drum, raw sand and water are charged into the inner stirring chamber, and the cylindrical drum is rotated by an operation of a driving device. In the method for producing crushed sand for concrete, whereby the medium stone, the raw sand and the water are stirred in the internal stirring chamber, and the crushed sand obtained by this stirring action is taken out from the internal stirring chamber together with the water. A method for producing crushed sand for concrete, characterized in that the amount of stones is maintained within a height range of ¼ to ⅓ of the diameter of the inner peripheral surface of the cylindrical drum.
に従って該筒状ドラムの回転数を小さくするようにした
ことを特徴とする請求項１に記載のコンクリート用砕砂
の製造方法。2. The method for producing crushed sand for concrete according to claim 1, wherein the rotational speed of the cylindrical drum is reduced as the diameter of the inner peripheral surface of the cylindrical drum increases.
例して水の投入量を増減させるようにしたことを特徴と
する請求項１又は２に記載のコンクリート用砕砂の製造
方法。3. The method for producing crushed sand for concrete according to claim 1, wherein the amount of water input is increased or decreased in proportion to or approximately in proportion to the amount of raw sand input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3334171A JPH0773679B2 (en) | 1991-10-16 | 1991-11-22 | Method for producing crushed sand for concrete |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-298271 | 1991-10-16 | ||
| JP29827191 | 1991-10-16 | ||
| JP3334171A JPH0773679B2 (en) | 1991-10-16 | 1991-11-22 | Method for producing crushed sand for concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05161854A true JPH05161854A (en) | 1993-06-29 |
| JPH0773679B2 JPH0773679B2 (en) | 1995-08-09 |
Family
ID=26561449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3334171A Expired - Lifetime JPH0773679B2 (en) | 1991-10-16 | 1991-11-22 | Method for producing crushed sand for concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0773679B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02222736A (en) * | 1989-02-23 | 1990-09-05 | Nakaya Jitsugyo Kk | Producing equipment for crushed sand for concrete |
-
1991
- 1991-11-22 JP JP3334171A patent/JPH0773679B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02222736A (en) * | 1989-02-23 | 1990-09-05 | Nakaya Jitsugyo Kk | Producing equipment for crushed sand for concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0773679B2 (en) | 1995-08-09 |
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