JP5995538B2 - Coarse aggregate cooling method and coarse aggregate cooling system - Google Patents

Coarse aggregate cooling method and coarse aggregate cooling system Download PDF

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JP5995538B2
JP5995538B2 JP2012128285A JP2012128285A JP5995538B2 JP 5995538 B2 JP5995538 B2 JP 5995538B2 JP 2012128285 A JP2012128285 A JP 2012128285A JP 2012128285 A JP2012128285 A JP 2012128285A JP 5995538 B2 JP5995538 B2 JP 5995538B2
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佐藤　英明
英明 佐藤
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Kumagai Gumi Co Ltd
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Description

本発明は、粗骨材を効率よく冷却する方法に関するものである。   The present invention relates to a method for efficiently cooling coarse aggregate.

ダムなどの打設現場で使用する生コンクリートを製造するバッチャープラントは、生コンクリートの原料であるセメント、水、細骨材（砂）、粗骨材（砂利）、混和材、及び、混和剤、を所定の配合比になるよう計量した後、これらの材料をコンクリートミキサーにて混練して、この混練されたコンクリートをホッパーからトランスファーカーなどの運搬手段に供給する構成となっている。
従来、バッチャープラントに供給されるセメント、水、細骨材（砂）、粗骨材（砂利）、混和材、及び、混和剤、を、混練作業に先立って予め所定温度に冷却することで生コンクリートの練り上がり時における温度上昇を抑制するプレクーリング工法が提案されている（例えば、特許文献１参照）。
細骨材を冷却する方法としては、細骨材を特殊な分散装置で分散させながら落下させるとともに、落下する細骨材の下側から冷風（低温低湿度空気）を送風して細骨材の表面に冷風を効率よく接触させて細骨材を冷却する気化冷却法が多く用いられている（例えば、特許文献２参照）。 The batcher plant that manufactures ready-mixed concrete to be used at construction sites such as dams is cement, water, fine aggregate (sand), coarse aggregate (gravel), admixture, and admixture. Are measured so as to have a predetermined mixing ratio, and then these materials are kneaded by a concrete mixer, and the kneaded concrete is supplied from a hopper to a transport means such as a transfer car.
Conventionally, cement, water, fine aggregate (sand), coarse aggregate (gravel), admixture, and admixture supplied to a batcher plant are cooled to a predetermined temperature in advance of the kneading operation. There has been proposed a pre-cooling method that suppresses temperature rise when raw concrete is kneaded (see, for example, Patent Document 1).
As a method of cooling the fine aggregate, the fine aggregate is dropped while being dispersed with a special dispersing device, and cold air (low temperature and low humidity air) is blown from the lower side of the falling fine aggregate. An evaporative cooling method in which cold air is efficiently brought into contact with the surface to cool the fine aggregate is often used (for example, see Patent Document 2).

一方、粗骨材は透気性がよいため特殊な設備を必要とすることなく、例えば、図３に示すように、冷風供給手段３からの冷風を粗骨材貯蔵ビン４Ａ〜４Ｃの下方から粗骨材Ｇに直接を送風することで、収納室４１内の粗骨材Ｇを容易に冷却することができる。このとき、散水装置４２を設け、収納室４１の上部から散水を行いながら粗骨材Ｇに送風するようにすれば、保水性の少ない粗骨材Ｇに気化冷却を有効に作用させることができるので、粗骨材Ｇを効率よく冷却することができる（例えば、特許文献３参照）。   On the other hand, since the coarse aggregate has good air permeability, no special equipment is required. For example, as shown in FIG. By blowing air directly to the aggregate G, the coarse aggregate G in the storage chamber 41 can be easily cooled. At this time, if the water sprinkler 42 is provided and air is blown to the coarse aggregate G while sprinkling water from the upper part of the storage chamber 41, evaporative cooling can be effectively applied to the coarse aggregate G with less water retention. Therefore, the coarse aggregate G can be efficiently cooled (see, for example, Patent Document 3).

特開平１０−３２９１３０号公報Japanese Patent Laid-Open No. 10-329130 特開平８−１１２８１２号公報JP-A-8-1112812 特開平１０−３２９１３１号公報Japanese Patent Laid-Open No. 10-329131

冷却された細骨材は、一般に、引き出しコンベヤや傾斜コンベヤなどの搬送手段により搬送されてバッチャープラントに設けられた粗骨材貯蔵槽に供給される。
ところで、細骨材の冷却設備はバッチャープラントの近くに設置されるが、粗骨材は、細骨材に比べて使用量が多いことから、粗骨材の冷却設備はバッチャープラントから離れた箇所に設けられることが多い。そのため、搬送距離が長い場合には、バッチャープラントに供給される粗骨材の温度が上昇してしまうといった問題点があった。 The cooled fine aggregate is generally conveyed by a conveying means such as a drawer conveyor or an inclined conveyor, and supplied to a coarse aggregate storage tank provided in the batcher plant.
By the way, the cooling equipment for fine aggregate is installed near the batcher plant, but the amount of coarse aggregate used is larger than that of fine aggregate, so the cooling equipment for coarse aggregate is separated from the batcher plant. It is often provided at the location. Therefore, when the conveyance distance is long, there is a problem that the temperature of the coarse aggregate supplied to the batcher plant increases.

そこで、粗骨材貯蔵ビンにおいて冷却する粗骨材の温度を所定温度よりも低くすることも考えられるが、そのためには、粗骨材の冷却設備を大型化しなければならない。
また、図４に示すように、粗骨材Ｇの冷却をバッチャープラント２で行うことも考えられるが、粗骨材Ｇがバッチャープラント２の粗骨材貯蔵槽２１Ｇに滞留する時間が短いことから、冷却設備６を大型化して粗骨材Ｇを強力にかつ急速に冷却しなければならない。 Therefore, it is conceivable that the temperature of the coarse aggregate to be cooled in the coarse aggregate storage bin is lower than a predetermined temperature, but for that purpose, the coarse aggregate cooling facility must be enlarged.
Further, as shown in FIG. 4, it is conceivable to cool the coarse aggregate G in the batcher plant 2, but the time during which the coarse aggregate G stays in the coarse aggregate storage tank 21 </ b> G of the batcher plant 2 is short. Therefore, the cooling equipment 6 must be enlarged to cool the coarse aggregate G powerfully and rapidly.

本発明は、上記問題点に鑑みてなされたもので、粗骨材の冷却設備を大型化することなく、粗骨材を効率よく冷却する方法とそのシステムを提供することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to provide a method and a system for efficiently cooling coarse aggregates without increasing the size of the coarse aggregate cooling equipment.

本発明は、バッチャープラントの粗骨材を冷却する方法であって、コンクリートの打設時に、粗骨材を貯蔵して冷却する粗骨材冷却設備に供給する冷風の一部を、バッチャープラントに設けられた粗骨材貯蔵槽に供給して、前記粗骨材冷却設備で冷却されて前記粗骨材貯蔵槽に送られた粗骨材を再冷却することを特徴とする。
これにより、粗骨材冷却設備に供給していた冷風で、粗骨材冷却設備に貯蔵された粗骨材とバッチャープラントの粗骨材の両方を冷却できるとともに、バッチャープラントでの粗骨材の再冷却は粗骨材の搬送時の温度上昇分だけ行えばよいので、粗骨材の冷却設備を大型化することなく、コンクリートのプレクーリングを確実に行うことができる。 The present invention relates to a method for cooling coarse aggregate of a batcher plant, and a portion of cold air supplied to a coarse aggregate cooling facility for storing and cooling coarse aggregate is placed in a batcher when placing concrete. The coarse aggregate is supplied to a coarse aggregate storage tank provided in a plant , cooled by the coarse aggregate cooling facility , and recooled to the coarse aggregate sent to the coarse aggregate storage tank.
As a result, both the coarse aggregate stored in the coarse aggregate cooling facility and the coarse aggregate in the batcher plant can be cooled with the cold air supplied to the coarse aggregate cooling facility, and the coarse bone in the batcher plant can be cooled. Since the recooling of the material only needs to be performed by the temperature rise during the transportation of the coarse aggregate, the concrete can be reliably precooled without increasing the size of the coarse aggregate cooling facility.

また、本発明は、冷風を供給する冷風供給手段と、粗骨材を貯蔵するとともに前記冷風供給手段から供給される冷風により前記粗骨材を冷却する粗骨材冷却設備と、前記粗骨材冷却設備で冷却された粗骨材をバッチャープラントに設けられた粗骨材貯蔵槽に搬送する搬送手段とを備えた粗骨材冷却システムであって、前記冷風供給手段から供給される冷風の一部を前記粗骨材貯蔵槽に供給するための冷風用配管と、前記粗骨材冷却設備への冷風の供給量と前記粗骨材貯蔵槽への冷風の供給量とを制御する送風制御手段とを備え、前記送風制御手段は、コンクリートの打設時にのみ、前記粗骨材貯蔵槽に冷風を供給するように前記冷風供給手段を制御することを特徴とするものである。
これにより、粗骨材冷却設備に貯蔵された粗骨材を所定の温度に冷却しつつ、搬送中に温度が上昇した粗骨材の温度を効果的に前記所定の温度に戻すことができる。
また、コンクリートの打設作業を行っていないときには、冷風は全て粗骨材冷却設備のみに供給されるので、粗骨材冷却設備の粗骨材を十分にプレクーリングすることができる。
なお、「コンクリートの打設時にのみ」は、「コンクリートの打設作業を行うときのみ」を指す。すなわち、本願発明はコンクリートのプレクーリングを前提としているので、粗骨材貯蔵槽への冷風の供給は、当然のことながら、現場におけるコンクリートの打設開始前であって、バッチャープラントにおける粗骨材などのコンクリートの原料の計量前に行う事前冷却時に開始される。 The present invention also provides cold air supply means for supplying cold air, coarse aggregate cooling equipment for storing the coarse aggregate and cooling the coarse aggregate with the cold air supplied from the cold air supply means, and the coarse aggregate A coarse aggregate cooling system comprising a conveying means for conveying coarse aggregate cooled by a cooling facility to a coarse aggregate storage tank provided in a batcher plant, wherein the cold air supplied from the cold air supply means a cold air pipe for supplying the coarse aggregate reservoir part, the blower control for controlling the supply amount of the cold air of the supply amount of the cold air into the coarse aggregate cooling equipment said to coarse aggregate reservoir and means, the blowing control means only concrete hitting設時, is characterized in that for controlling the cold air supply means to supply cool air to the coarse aggregate reservoir.
Thereby, while cooling the coarse aggregate stored in the coarse aggregate cooling facility to a predetermined temperature, the temperature of the coarse aggregate whose temperature has been increased during conveyance can be effectively returned to the predetermined temperature.
Further, when the concrete placing operation is not performed, all of the cold air is supplied only to the coarse aggregate cooling facility, so that the coarse aggregate of the coarse aggregate cooling facility can be sufficiently precooled.
“Only when concrete is placed” means “only when concrete is placed”. That is, since the present invention is premised on concrete precooling, the supply of cold air to the coarse aggregate storage tank is, of course, before the start of concrete placement on site, It starts at the time of pre-cooling, which is performed before weighing concrete materials such as wood.

また、本発明は、前記粗骨材貯蔵槽に貯蔵された粗骨材の温度情報を検出する手段を設けるとともに、前記送風制御手段が、前記検出された粗骨材の温度情報に基づいて前記粗骨材貯蔵槽に供給する冷風の供給量を制御することを特徴とする。
これにより、運搬中の粗骨材の温度上昇に応じてバッチャープラントの内の粗骨材を冷却できるので、粗骨材の冷却を効率よく行うことができる。 Further, the present invention provides a means for detecting temperature information of the coarse aggregate stored in the coarse aggregate storage tank, and the air blowing control means is based on the detected temperature information of the coarse aggregate. The supply amount of the cold air supplied to the coarse aggregate storage tank is controlled.
Thereby, since the coarse aggregate in a batcher plant can be cooled according to the temperature rise of the coarse aggregate in conveyance, coarse aggregate can be cooled efficiently.

また、本発明は、前記搬送手段をベルトコンベヤとし、前記ベルトコンベヤにコンベヤベルトを覆うカバーを設けるとともに、前記送風制御手段が、前記コンベヤベルト上の粗骨材にも冷風を供給するように前記冷風供給手段を制御することを特徴とする。
これにより、粗骨材貯蔵槽に送られる粗骨材の温度上昇を抑制できるので、粗骨材貯蔵槽の粗骨材を容易にかつ迅速に元の温度に戻すことができる。したがって、粗骨材を更に効率よくプレクーリングできる。 In the present invention, the conveying means is a belt conveyor, and a cover for covering the conveyor belt is provided on the belt conveyor, and the air blowing control means supplies the cold air to the coarse aggregate on the conveyor belt. Controlling cold air supply means.
Thereby, since the temperature rise of the coarse aggregate sent to a coarse aggregate storage tank can be suppressed, the coarse aggregate of a coarse aggregate storage tank can be easily and rapidly returned to the original temperature. Therefore, the coarse aggregate can be precooled more efficiently.

なお、前記発明の概要は、本発明の必要な全ての特徴を列挙したものではなく、これらの特徴群のサブコンビネーションもまた、発明となり得る。   The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

本実施の形態に係る粗骨材冷却システムの構成を示す図である。It is a figure which shows the structure of the coarse aggregate cooling system which concerns on this Embodiment. 送風制御手段の動作を説明するための図である。It is a figure for demonstrating operation | movement of a ventilation control means. 従来の粗骨材の冷却方法を示す図である。It is a figure which shows the cooling method of the conventional coarse aggregate. 粗骨材の冷却方法の他の例を示す図である。It is a figure which shows the other example of the cooling method of a coarse aggregate.

以下、実施の形態を通じて本発明を詳説するが、以下の実施の形態は特許請求の範囲に係る発明を限定するものでなく、また、実施の形態の中で説明される特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。   Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

図１は、本実施の形態に係る粗骨材冷却システム１の構成を示す図で、２はバッチャープラント、３は冷風供給手段、４は粗骨材冷却設備、５は粗骨材搬送手段としての搬送コンベヤである。
バッチャープラント２は、セメント、水、細骨材（砂）、粗骨材（砂利）、混和材、及び、混和剤などの生コンクリートの原料をそれぞれ貯蔵する貯蔵槽２１と、前記原料をそれぞれ配合比に応じて計量する計量器２２と、前記原料を混練するコンクリートミキサー２３と、混練されたコンクリートを排出するホッパー２４とを備え、ダムなどの打設現場で使用する生コンクリートを製造して、ホッパー２４から、図示しないトランスファーカーなどの運搬手段に生コンクリートを供給する。
以下、貯蔵槽のうちの粗骨材Ｇを貯蔵する貯蔵槽を粗骨材貯蔵槽２１Ｇという。 FIG. 1 is a diagram showing a configuration of a coarse aggregate cooling system 1 according to the present embodiment, in which 2 is a batcher plant, 3 is cold air supply means, 4 is coarse aggregate cooling equipment, and 5 is coarse aggregate transport means. As a conveyor.
The batcher plant 2 includes a storage tank 21 for storing raw materials of raw concrete such as cement, water, fine aggregate (sand), coarse aggregate (gravel), admixture, and admixture, and the raw materials respectively. It comprises a measuring instrument 22 that measures according to the blending ratio, a concrete mixer 23 that kneads the raw materials, and a hopper 24 that discharges the kneaded concrete. The ready-mixed concrete is supplied from the hopper 24 to a transport means such as a transfer car (not shown).
Hereinafter, the storage tank for storing the coarse aggregate G in the storage tank is referred to as a coarse aggregate storage tank 21G.

冷風供給手段３は、送風機３１と、送風機３１に冷風を送る冷凍機３２と、冷凍機３２の冷却水を冷却するクーリングタワー３３と、送風機３１からの冷風を粗骨材冷却設備４に供給するための第１の送風ダクト３４と、送風機３１からの冷風を粗骨材貯蔵槽２１Ｇに供給するための第２の送風ダクト３５と、送風機３１を制御して送風機３１から排出される冷風の温度、湿度、冷風の供給量（以下、送風量という）を制御する送風制御手段３６とを備える。
第２の送風ダクト３５が本発明の冷風用配管に相当する。
このように、冷風供給手段３に送風制御手段３６を設けて、送風機３１からの冷風を粗骨材冷却設備４と粗骨材貯蔵槽２１Ｇの両方に供給できるようにするとともに、粗骨材冷却設備４に供給する送風量と粗骨材貯蔵槽２１Ｇに供給する送風量との比を変更可能とすれば、例えば、コンクリートの打設時には骨材冷却設備４と粗骨材貯蔵槽２１Ｇとに適当な比率で冷風を供給することができるだけでなく、コンクリートの打設前には、粗骨材冷却設備４のみに冷風を供給することも可能である。
なお、送風量の制御方法としては、例えば、送風機３１と第１の送風ダクト３４との間、及び、送風機３１と第２の送風ダクト３５との間に、それぞれ、電磁弁とレギュレータ（流量調整バルブ）を配置するとともに、送風制御手段３６により、電磁弁の開閉、及び、バルブ開度の調整を行って、第１の送風ダクト３４へ供給する送風量と第２の送風ダクト３５へ供給する送風量とを調整するようにすればよい。 The cold air supply means 3 supplies the cool air from the blower 31, the refrigerator 32 that sends the cold air to the blower 31, the cooling tower 33 that cools the cooling water of the refrigerator 32, and the coarse aggregate cooling facility 4. The first air duct 34, the second air duct 35 for supplying the cool air from the air blower 31 to the coarse aggregate storage tank 21G, the temperature of the cold air discharged from the air blower 31 by controlling the air blower 31, And air supply control means 36 for controlling the supply amount of humidity and cold air (hereinafter referred to as air supply).
The second air duct 35 corresponds to the cold air pipe of the present invention.
In this way, the cool air supply means 3 is provided with the air blowing control means 36 so that the cool air from the blower 31 can be supplied to both the coarse aggregate cooling facility 4 and the coarse aggregate storage tank 21G, and the coarse aggregate cooling. If the ratio between the amount of air supplied to the equipment 4 and the amount of air supplied to the coarse aggregate storage tank 21G can be changed, for example, when placing concrete, the aggregate cooling equipment 4 and the coarse aggregate storage tank 21G Not only can cold air be supplied at an appropriate ratio, but it is also possible to supply cold air only to the coarse aggregate cooling facility 4 before placing concrete.
In addition, as a control method of ventilation volume, for example, between the blower 31 and the first blower duct 34 and between the blower 31 and the second blower duct 35, respectively, an electromagnetic valve and a regulator (flow rate adjustment). Valve) and opening / closing of the solenoid valve and adjustment of the valve opening degree by the air blowing control means 36, and the air volume supplied to the first air duct 34 and the second air duct 35 are supplied. What is necessary is just to adjust a ventilation volume.

粗骨材冷却設備４は、粗骨材Ｇを収納する収納室４１と、収納室４１の上部に設けられて粗骨材Ｇに散水する散水装置４２と、収納室４１の底部の設けられた空気供給口４３と、図示しない粗骨材排出手段とを有する複数の粗骨材貯蔵ビン４Ａ〜４Ｃを備える。
粗骨材貯蔵ビン４Ａ〜４Ｃの空気供給口４３は、それぞれ、第１の送風ダクト３４に連結されている。したがって、収納室４１に収納された粗骨材Ｇに上方から散水装置４２により散水するとともに、第１の送風ダクト３４から空気供給口４３を通って供給される冷風を下方から粗骨材Ｇに供給すれば、粗骨材Ｇの表面に付着した水が冷風により気化されて粗骨材を冷却するので、粗骨材Ｇを効果的に冷却することができる。
なお、散水もしくは冷風のみで粗骨材Ｇを冷却してもよいが、本例のように、散水しながら冷風と接触させて粗骨材Ｇを冷却する気化冷却法を用いて粗骨材Ｇを冷却する方が冷却効率よいので好ましい。
収納室４１で冷却された粗骨材Ｇは、粗骨材排出手段により収納室４１から搬送コンベヤ５に移送される。
搬送コンベヤ５は、所定の温度に冷却された粗骨材Ｇを粗骨材冷却設備４からバッチャープラント２まで搬送して粗骨材貯蔵槽２１Ｇ内に投入する。 The coarse aggregate cooling facility 4 is provided with a storage chamber 41 for storing the coarse aggregate G, a watering device 42 provided at the top of the storage chamber 41 for spraying the coarse aggregate G, and a bottom portion of the storage chamber 41. A plurality of coarse aggregate storage bins 4 </ b> A to 4 </ b> C having an air supply port 43 and coarse aggregate discharge means (not shown) are provided.
The air supply ports 43 of the coarse aggregate storage bins 4 </ b> A to 4 </ b> C are connected to the first air duct 34. Accordingly, the coarse aggregate G stored in the storage chamber 41 is sprinkled from above with the water spraying device 42, and the cool air supplied from the first air duct 34 through the air supply port 43 is transferred to the coarse aggregate G from below. If supplied, the water adhering to the surface of the coarse aggregate G is vaporized by cold air to cool the coarse aggregate, so that the coarse aggregate G can be effectively cooled.
The coarse aggregate G may be cooled only with water spray or cold air. However, as in this example, the coarse aggregate G is used by a vaporization cooling method in which the coarse aggregate G is cooled by being in contact with the cold air while sprinkling water. It is preferable to cool this because the cooling efficiency is high.
The coarse aggregate G cooled in the storage chamber 41 is transferred from the storage chamber 41 to the transport conveyor 5 by the coarse aggregate discharge means.
The conveyor 5 conveys the coarse aggregate G cooled to a predetermined temperature from the coarse aggregate cooling facility 4 to the batcher plant 2 and puts it into the coarse aggregate storage tank 21G.

次に、粗骨材の冷却方法について、図２のタイムチャートを参照して説明する。
バッチャープラント２で生コンクリートの製造を一日のうち時刻ｔ1〜時刻ｔ2まで連続して行う場合には、粗骨材冷却設備４には、同図の一点鎖線で示すように一日中冷風を供給し、粗骨材貯蔵槽２１Ｇには、同図の実線で示すように、時刻ｔ1〜時刻ｔ2の間だけ冷風を供給するように送風機３１を制御する。
なお、上記時刻ｔ1は、バッチャープラント２における粗骨材などのコンクリートの原料の計量前に行う時刻より所定時間（予め設定された事前冷却期間）だけ前の時刻である。
ここで、送風機３１の総送風量をＱとし、粗骨材貯蔵槽２１Ｇへの送風量をｑとすると、零時から時刻ｔ1までは粗骨材冷却設備４への送風量はＱであり、時刻ｔ1〜時刻ｔ2では送風量はＱ−ｑとなり、時刻ｔ2から２４時までの送風量はＱとなる。なお、冷風の温度Ｔ及び湿度Ｈは一定（例えば、Ｔ＝１５℃、Ｈ＝７０％）とする。
例えば、粗骨材は粗骨材貯蔵ビン４Ａ〜４Ｃにて約１５℃に冷却され、搬送コンベヤ５によりバッチャープラント２まで搬送されるが、例えば、外気温が３０℃であれば、粗骨材貯蔵槽２１Ｇ内に投入される時点では、粗骨材の温度は１７℃程度まで上昇する。
通常、粗骨材は、粗骨材貯蔵槽２１Ｇに３０分程度貯蔵しか貯蔵されないが、粗骨材貯蔵槽２１Ｇでは、粗骨材の温度を１７℃から１５℃に下げればよいので、少ない送風量でも粗骨材の温度を再冷却して所定の温度（ここでは、１５℃）に容易に戻すことができる。
前記粗骨材貯蔵槽２１Ｇへの送風量ｑとしては、総送風量Ｑの２０％程度であれば十分である。
例えば、日最大打設時間が１２時間の現場では、毎日打設工程計画でも、一日分の粗骨材を２４時間で冷却すれば、バッチャープラント２で粗骨材を冷却する場合に比べて冷却設備の容量を小さくできる。
なお、生コンクリートの製造中は、粗骨材貯蔵ビン４Ａ〜４Ｃへの送風量はＱ−ｑ＝０．８・Ｑと減少するが、前記のように、粗骨材は粗骨材貯蔵ビン４Ａ〜４Ｃにて２４時間冷却されるので、冷却設備の容量としては、バッチャープラント２で冷却する場合に比べて基本的には、約１/２となる。
また、本発明では、粗骨材貯蔵槽２１Ｇで粗骨材の温度上昇分を再冷却する構成なので、搬送時の温度上昇を見込んで、粗骨材貯蔵ビン４Ａ〜４Ｃに貯蔵された粗骨材を全て約１５℃よりも低い温度に冷却する場合に比べて、冷却設備の容量を小さくできる。 Next, a method for cooling the coarse aggregate will be described with reference to the time chart of FIG.
When the batcher plant 2 continuously manufactures ready-mixed concrete from time t 1 to time t 2 of the day, the coarse aggregate cooling facility 4 is supplied with cold air all day long as shown by the dashed line in FIG. supplies, the coarse aggregate reservoir 21G, as shown by the solid line in the figure, controls the blower 31 to supply the cold air only during the time t 1 ~ time t 2.
The time t 1 is a time that is a predetermined time (preliminary pre-cooling period) before the time before the measurement of the raw material of the concrete such as coarse aggregate in the batcher plant 2.
Here, if the total blown amount of the blower 31 is Q and the blown amount to the coarse aggregate storage tank 21G is q, the blown amount to the coarse aggregate cooling facility 4 is Q from midnight to time t 1 . From time t 1 to time t 2 , the air flow rate is Q−q, and the air flow rate from time t 2 to 24:00 is Q. Note that the temperature T and humidity H of the cold air are constant (for example, T = 15 ° C., H = 70%).
For example, the coarse aggregate is cooled to about 15 ° C. in the coarse aggregate storage bins 4A to 4C and conveyed to the batcher plant 2 by the conveyance conveyor 5. For example, if the outside air temperature is 30 ° C., the coarse bone At the time when it is put into the material storage tank 21G, the temperature of the coarse aggregate rises to about 17 ° C.
Normally, coarse aggregate is only stored for about 30 minutes in the coarse aggregate storage tank 21G. However, in the coarse aggregate storage tank 21G, the temperature of the coarse aggregate may be lowered from 17 ° C. to 15 ° C. Even with the air volume, the temperature of the coarse aggregate can be easily re-cooled to a predetermined temperature (here, 15 ° C.).
The amount of air blown to the coarse aggregate storage tank 21G is sufficient if it is about 20% of the total airflow amount Q.
For example, at a site where the maximum daily placement time is 12 hours, even in the daily placement process plan, if the coarse aggregate for one day is cooled in 24 hours, compared to the case where the coarse aggregate is cooled in the batcher plant 2. Therefore, the capacity of the cooling facility can be reduced.
During the production of ready-mixed concrete, the amount of air blown to the coarse aggregate storage bins 4A to 4C is reduced to Qq = 0.8 · Q. As described above, the coarse aggregate is a coarse aggregate storage bin. Since cooling is performed at 4A to 4C for 24 hours, the capacity of the cooling facility is basically about 1/2 as compared with the case of cooling by the batcher plant 2.
Moreover, in this invention, since it is the structure which recools the temperature rise of a coarse aggregate with the coarse aggregate storage tank 21G, the coarse bone stored in the coarse aggregate storage bins 4A-4C in anticipation of the temperature rise at the time of conveyance. Compared with the case where all the materials are cooled to a temperature lower than about 15 ° C., the capacity of the cooling facility can be reduced.

このように、本実施の形態では、冷風を粗骨材冷却設備４の粗骨材貯蔵ビン４Ａ〜４Ｃに供給する第１の送風ダクト３４と、冷風を粗骨材貯蔵槽２１Ｇに供給する第２の送風ダクト３５とを設けるとともに、送風制御手段３６により、送風機３１から粗骨材冷却設備４に供給する冷風の量（送風量）と、粗骨材貯蔵槽２１Ｇに供給する冷風の量（送風量）との割合を制御するようにしたので、１台の冷風供給手段３により、複数の粗骨材貯蔵ビン４Ａ〜４Ｃに収納された粗骨材のみを冷却したり、粗骨材貯蔵ビン４Ａ〜４Ｃに収納された粗骨材とバッチャープラント２の粗骨材貯蔵槽２１Ｇに搬送された粗骨材の両方を冷却したりすることができる。
したがって、搬送時に粗骨材の温度が上昇した場合でも、粗骨材貯蔵ビン４Ａ〜４Ｃに収納された粗骨材を十分に冷却しつつ、粗骨材貯蔵槽２１Ｇ内の粗骨材の温度を所定の温度に戻せるので、コンクリートのプレクーリングを効率よく行うことができる。 As described above, in the present embodiment, the first air duct 34 that supplies the cold air to the coarse aggregate storage bins 4A to 4C of the coarse aggregate cooling facility 4 and the first air duct 34 that supplies the cold air to the coarse aggregate storage tank 21G. 2, and the amount of cold air supplied to the coarse aggregate cooling facility 4 from the blower 31 and the amount of cold air supplied to the coarse aggregate storage tank 21G ( Since the ratio of the air volume) is controlled, only one of the coarse aggregates stored in the plurality of coarse aggregate storage bins 4A to 4C is cooled by the single cold air supply means 3, or the coarse aggregate storage Both the coarse aggregate stored in the bins 4A to 4C and the coarse aggregate conveyed to the coarse aggregate storage tank 21G of the batcher plant 2 can be cooled.
Therefore, even when the temperature of the coarse aggregate rises during transportation, the temperature of the coarse aggregate in the coarse aggregate storage tank 21G is sufficiently cooled while the coarse aggregate stored in the coarse aggregate storage bins 4A to 4C is sufficiently cooled. Can be returned to a predetermined temperature, so that concrete precooling can be performed efficiently.

また、本実施の形態の粗骨材冷却システム１では、例えば、トランスファーカーの故障などのトラブルにより、生コンクリートの製造が一時中断した場合に、粗骨材貯蔵槽２１Ｇ内の粗骨材の温度上昇を抑制することができるという利点がある。
すなわち、粗骨材貯蔵ビン４Ａ〜４Ｃのみで粗骨材を冷却した場合には、中断時に粗骨材貯蔵槽２１Ｇ内の粗骨材の温度が上昇してしまうため、生コンクリートの製造再開時の前に粗骨材貯蔵槽２１Ｇ内の粗骨材を回収する必要があったが、粗骨材冷却システム１では、粗骨材貯蔵槽２１Ｇへの冷風の供給を継続することで、粗骨材の温度上昇を抑制できるので、トラブルが解消した時点で直ちに生コンクリートの製造を再開できる。
また、従来は、打設終了時には粗骨材貯蔵槽２１Ｇ内に残った粗骨材を回収していたが、本願発明では、粗骨材貯蔵槽２１Ｇ内に冷風を送れるので、残留している粗骨材を回収せずに、コンクリートの打設時に再冷却することも可能である。したがって、残留粗骨材の回収作業を省略できるので、作業効率が向上する。
なお、バッチャープラント２で粗骨材を冷却する場合も、トラブルが解消した時点で直ちに生コンクリートの製造を再開したり、残留粗骨材を再冷却できるが、前述したように、バッチャープラント２のみで粗骨材を冷却するのは、冷却設備を大型化する必要があるので、現実的でない。 In the coarse aggregate cooling system 1 of the present embodiment, for example, when the production of ready-mixed concrete is temporarily interrupted due to a trouble such as a transfer car failure, the temperature of the coarse aggregate in the coarse aggregate storage tank 21G. There is an advantage that the rise can be suppressed.
That is, when the coarse aggregate is cooled only by the coarse aggregate storage bins 4A to 4C, the temperature of the coarse aggregate in the coarse aggregate storage tank 21G rises at the time of interruption. It was necessary to collect the coarse aggregate in the coarse aggregate storage tank 21G before the coarse aggregate cooling system 1, but in the coarse aggregate cooling system 1, by continuing the supply of cold air to the coarse aggregate storage tank 21G, Since the temperature rise of the material can be suppressed, the production of ready-mixed concrete can be resumed as soon as the trouble is resolved.
Further, conventionally, the coarse aggregate remaining in the coarse aggregate storage tank 21G was collected at the end of placement, but in the present invention, cold air can be sent into the coarse aggregate storage tank 21G, so that it remains. It is also possible to recool the concrete when placing it without collecting the coarse aggregate. Accordingly, the work of collecting the remaining coarse aggregate can be omitted, and the work efficiency is improved.
In addition, when the coarse aggregate is cooled in the batcher plant 2, the production of ready-mixed concrete can be resumed immediately after the trouble is resolved, or the residual coarse aggregate can be re-cooled. Cooling the coarse aggregate with only 2 is not practical because the cooling equipment needs to be enlarged.

なお、前記実施の形態では、粗骨材貯蔵槽２１Ｇへの送風量ｑを総送風量Ｑの２０％程度としたが、送風量ｑはこれに限るものではなく、粗骨材貯蔵ビン４Ａ〜４Ｃで冷却する粗骨材の量、粗骨材貯蔵槽２１Ｇに収納される粗骨材の量、あるいは、搬送コンベヤ５の長さ（粗骨材の移動距離）などにより適宜決定される。
また、前記例では、粗骨材貯蔵ビン４Ａ〜４Ｃを一日中冷却したが、粗骨材貯蔵ビン４Ａ〜４Ｃの冷却をコンクリートの打設開始時（厳密には、生コンクリートの製造開始時）よりも所定の時間間隔Ｔaだけ早い時刻から開始し、生コンクリートの製造終了時よりも所定の時間間隔Ｔbだけ早い時に終了するようにしてもよい。なお、バッチャープラント２での粗骨材の再冷却についても、生コンクリートの製造開始時よりも所定の時間間隔Ｔaだけ早い時刻から開始し、生コンクリートの製造終了時よりも所定の時間間隔Ｔbだけ早い時に終了するようにしてもよい。
いずれの場合にも、送風制御手段３６により、コンクリートの打設時には粗骨材貯蔵ビン４Ａ〜４Ｃと粗骨材貯蔵槽２１Ｇの両方に冷風を供給するように送風機３１を制御して、粗骨材貯蔵槽２１Ｇ内の粗骨材を再冷却するようにすれば、コンクリートのプレクーリングを容易にかつ効率よく行うことができる。 In the above-described embodiment, the air flow rate q to the coarse aggregate storage tank 21G is set to about 20% of the total air flow rate Q. However, the air flow rate q is not limited to this, and the coarse aggregate storage bins 4A to 4A. It is appropriately determined depending on the amount of coarse aggregate to be cooled at 4C, the amount of coarse aggregate stored in the coarse aggregate storage tank 21G, the length of the conveyor 5 (the travel distance of the coarse aggregate), and the like.
In the above example, the coarse aggregate storage bins 4A to 4C are cooled all day, but the cooling of the coarse aggregate storage bins 4A to 4C is started from the start of concrete placement (strictly, when the production of ready-mixed concrete starts). also starting from the earliest time a predetermined time interval T a, may be terminated when earlier by a predetermined time interval T b than at the end production of ready-mixed concrete. Here, also for the recooling of the coarse aggregate in the batcher plant 2, since the beginning of the manufacturing fresh concrete starting from a time earlier by a predetermined time interval T a, predetermined time interval than at the end production of ready-mixed concrete may be terminated when early only T b.
In any case, the blower control means 36 controls the blower 31 so as to supply the cold air to both the coarse aggregate storage bins 4A to 4C and the coarse aggregate storage tank 21G when placing concrete, and the coarse bone If the coarse aggregate in the material storage tank 21G is recooled, concrete precooling can be performed easily and efficiently.

また、前記実施の形態では、コンクリートの打設時にバッチャープラント２の粗骨材貯蔵槽２１Ｇに搬送された粗骨材を冷却したが、これに加えて、粗骨材貯蔵槽２１Ｇ内に粗骨材温度計測手段を設置して、粗骨材貯蔵槽２１Ｇ内に収納された粗骨材Ｇの温度を計測し、この計測結果に基づいて、粗骨材貯蔵槽２１Ｇに供給する冷風の量を制御すれば、粗骨材の冷却を更に効率よく行うことができる。
これにより、例えば、曇天の日で外気温が低い場合には、粗骨材貯蔵ビン４Ａ〜４Ｃへの送風量だけでなく、バッチャープラント２の粗骨材貯蔵槽２１Ｇに供給する冷風の量を減らすことができるので、粗骨材を効率よく冷却できる。
なお、前記粗骨材温度計測手段としては、例えば、非接触型放射温度計などが挙げられる。
また、粗骨材の温度に代えて、粗骨材の温度情報を用いてもよい。
粗骨材の温度情報としては、外気温や搬送コンベヤ５のコンベヤベルトの温度などが挙げられる。粗骨材の温度を直接測定しない場合には、外気温と粗骨材貯蔵槽２１Ｇ内の粗骨材の温度との関係や、コンベヤベルトの温度と粗骨材貯蔵槽２１Ｇ内の粗骨材の温度との関係を予め調べておけば、外気温やコンベヤベルトの温度を粗骨材の温度情報としての確度を高くすることができる。 Moreover, in the said embodiment, although the coarse aggregate conveyed to the coarse aggregate storage tank 21G of the batcher plant 2 was cooled at the time of concrete placement, in addition to this, in the coarse aggregate storage tank 21G, the coarse aggregate was stored. Aggregate temperature measuring means is installed to measure the temperature of the coarse aggregate G stored in the coarse aggregate storage tank 21G, and the amount of cold air supplied to the coarse aggregate storage tank 21G based on the measurement result If this is controlled, the coarse aggregate can be cooled more efficiently.
Thereby, for example, when the outside air temperature is low on a cloudy day, not only the amount of air blown to the coarse aggregate storage bins 4A to 4C but also the amount of cold air supplied to the coarse aggregate storage tank 21G of the batcher plant 2 Therefore, the coarse aggregate can be efficiently cooled.
Examples of the coarse aggregate temperature measuring means include a non-contact type radiation thermometer.
Further, instead of the temperature of the coarse aggregate, temperature information of the coarse aggregate may be used.
The temperature information of the coarse aggregate includes the outside air temperature and the temperature of the conveyor belt of the conveyor 5. When the temperature of the coarse aggregate is not directly measured, the relationship between the outside air temperature and the temperature of the coarse aggregate in the coarse aggregate storage tank 21G, the temperature of the conveyor belt and the coarse aggregate in the coarse aggregate storage tank 21G If the relationship with the temperature of the material is examined in advance, the accuracy of the outside air temperature and the temperature of the conveyor belt as the temperature information of the coarse aggregate can be increased.

また、搬送コンベヤ５にコンベヤベルトの全面を覆うカバーを設けるとともに、冷風供給手段３から供給される冷風の一部を前記カバー内に供給するためのコンベヤ用配管を設け、前記カバー内に冷風を送って搬送される粗骨材を冷却するようにすれば、粗骨材貯蔵槽２１Ｇに送られる粗骨材の温度上昇を抑制することができるので、粗骨材貯蔵槽２１Ｇの粗骨材を更に容易にかつ迅速に元の冷えた温度に戻すことができる。
なお、コンベヤ用配管としては、第１の送風ダクト３４からカバー内に冷風を送るダクトを分岐させてもよいし、第２の送風ダクト３５から前記ダクトを分岐させてもよい。但し、カバー内に冷風を送るのはコンクリートの打設時のみなので、第２の送風ダクト３５から分岐させる方が制御が容易であるので好ましい。 In addition, a cover for covering the entire surface of the conveyor belt is provided on the conveyor 5, a conveyor pipe for supplying a part of the cold air supplied from the cold air supply means 3 into the cover is provided, and the cool air is supplied into the cover. If the coarse aggregate sent and cooled is cooled, the temperature rise of the coarse aggregate sent to the coarse aggregate storage tank 21G can be suppressed, so the coarse aggregate in the coarse aggregate storage tank 21G can be reduced. Furthermore, it can return to the original cold temperature easily and quickly.
In addition, as piping for conveyors, the duct which sends cold air into the cover from the 1st ventilation duct 34 may be branched, and the said duct may be branched from the 2nd ventilation duct 35. FIG. However, since the cool air is sent into the cover only when the concrete is placed, it is preferable to branch from the second air duct 35 because it is easier to control.

以上、本発明を実施の形態を用いて説明したが、本発明の技術的範囲は前記実施の形態に記載の範囲には限定されない。前記実施の形態に、多様な変更または改良を加えることが可能であることが当業者にも明らかである。そのような変更または改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲から明らかである。   As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

本発明によれば、粗骨材の冷風供給手段の容量を大きくすることなく、バッチャープラントの粗骨材を効率よく冷却することができるので、経済性が高くかつ効率のよい粗骨材の冷却が可能となる。   According to the present invention, since the coarse aggregate of the batcher plant can be efficiently cooled without increasing the capacity of the cold air supply means for the coarse aggregate, the economical and efficient coarse aggregate can be obtained. Cooling is possible.

１ 粗骨材冷却システム、２ バッチャープラント、２１ 貯蔵槽、
２１Ｇ 粗骨材貯蔵槽、２２ 計量器、２３ コンクリートミキサー、２４ ホッパー、３ 冷風供給手段、３１ 送風機、３２ 冷凍機、３３ クーリングタワー、
３４ 第１の送風ダクト、３５ 第２の送風ダクト、３６ 送風制御手段、
４ 粗骨材冷却設備、４Ａ〜４Ｃ 粗骨材貯蔵ビン、４１ 収納室、４２ 散水装置、
４３ 空気供給口、５ 搬送コンベヤ、Ｇ 粗骨材。 1 coarse aggregate cooling system, 2 batcher plant, 21 storage tank,
21G Coarse aggregate storage tank, 22 Meter, 23 Concrete mixer, 24 hopper, 3 Cold air supply means, 31 Blower, 32 Refrigerator, 33 Cooling tower,
34 1st ventilation duct, 35 2nd ventilation duct, 36 ventilation control means,
4 Coarse Aggregate Cooling Equipment, 4A-4C Coarse Aggregate Storage Bin, 41 Storage Room, 42 Watering Device,
43 Air supply port, 5 Conveyor, G Coarse aggregate.

Claims (4)

コンクリートの打設時に、粗骨材を貯蔵して冷却する粗骨材冷却設備に供給する冷風の一部を、バッチャープラントに設けられた粗骨材貯蔵槽に供給して、前記粗骨材冷却設備で冷却されて前記粗骨材貯蔵槽に送られた粗骨材を再冷却することを特徴とする粗骨材の冷却方法。 A portion of the cool air supplied to the coarse aggregate cooling facility for storing and cooling the coarse aggregate when placing concrete is supplied to the coarse aggregate storage tank provided in the batcher plant, and the coarse aggregate A method for cooling a coarse aggregate, wherein the coarse aggregate cooled by a cooling facility and sent to the coarse aggregate storage tank is re-cooled. 冷風を供給する冷風供給手段と、粗骨材を貯蔵するとともに前記冷風供給手段から供給される冷風により前記粗骨材を冷却する粗骨材冷却設備と、前記粗骨材冷却設備で冷却された粗骨材をバッチャープラントに設けられた粗骨材貯蔵槽に搬送する搬送手段とを備えた粗骨材冷却システムにおいて、
前記冷風供給手段から供給される冷風の一部を前記粗骨材貯蔵槽に供給するための冷風用配管と、
前記粗骨材冷却設備への冷風の供給量と前記粗骨材貯蔵槽への冷風の供給量とを制御する送風制御手段とを備え、
前記送風制御手段は、
コンクリートの打設時にのみ、前記粗骨材貯蔵槽に冷風を供給するように前記冷風供給手段を制御することを特徴とする粗骨材冷却システム。 Cool air supply means for supplying cold air, coarse aggregate cooling equipment for storing the coarse aggregate and cooling the coarse aggregate with the cold air supplied from the cold air supply means, and cooled by the coarse aggregate cooling equipment In the coarse aggregate cooling system comprising a conveying means for conveying the coarse aggregate to a coarse aggregate storage tank provided in the batcher plant,
A pipe for cold air for supplying a part of the cold air supplied from the cold air supply means to the coarse aggregate storage tank;
And a blower control means for controlling the supply amount of the cold air of the to cold air supply amount and the coarse aggregate reservoirs to coarse aggregate cooling facility,
The air blowing control means
The coarse aggregate cooling system , wherein the cold air supply means is controlled so as to supply cold air to the coarse aggregate storage tank only at the time of placing concrete . 前記粗骨材貯蔵槽に貯蔵された粗骨材の温度情報を検出する手段を設けるとともに、
前記送風制御手段は、
前記検出された粗骨材の温度情報に基づいて前記粗骨材貯蔵槽に供給する冷風の供給量を制御することを特徴とする請求項２に記載の粗骨材冷却システム。 While providing means for detecting temperature information of the coarse aggregate stored in the coarse aggregate storage tank,
The air blowing control means
The coarse aggregate cooling system according to claim 2 , wherein a supply amount of cold air supplied to the coarse aggregate storage tank is controlled based on the detected temperature information of the coarse aggregate. 前記搬送手段をベルトコンベヤとし、
前記ベルトコンベヤにコンベヤベルトを覆うカバーと、前記冷風供給手段から供給される冷風の一部を前記カバー内に供給するためのコンベヤ用配管とを更に備え、
前記送風制御手段は、
前記コンベヤベルト上の粗骨材にも冷風を供給するように前記冷風供給手段を制御することを特徴とする請求項２または請求項３に記載の粗骨材冷却システム。 The conveying means is a belt conveyor,
The belt conveyor further includes a cover for covering the conveyor belt, and a conveyor pipe for supplying a part of the cold air supplied from the cold air supply means into the cover,
The air blowing control means
Coarse aggregate cooling system according to claim 2 or claim 3, wherein the controller controls the cold air supply means to supply cool air to coarse aggregate on the conveyor belt.
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JP2601845B2 (en) * 1987-11-13 1997-04-16 三菱重工業株式会社 Concrete kneading equipment with aggregate pre-cooling device
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US5152605A (en) * 1991-01-22 1992-10-06 Ushio Co., Ltd. Apparatus for making cooled concrete
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