JPS62122710A - Mixer for cooling concrete - Google Patents
Mixer for cooling concreteInfo
- Publication number
- JPS62122710A JPS62122710A JP26258985A JP26258985A JPS62122710A JP S62122710 A JPS62122710 A JP S62122710A JP 26258985 A JP26258985 A JP 26258985A JP 26258985 A JP26258985 A JP 26258985A JP S62122710 A JPS62122710 A JP S62122710A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- mixing
- cooling
- pressure
- mixer
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/46—Arrangements for applying super- or sub-atmospheric pressure during mixing; Arrangements for cooling or heating during mixing, e.g. by introducing vapour
- B28C5/468—Cooling, e.g. using ice
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、暑中コンクリートやマスコンクリートの施
工に用いられる練り上り温度の低いコンクリートを製造
するだめのコンクリート冷却用ミキサーに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mixer for cooling concrete that produces concrete with a low mixing temperature used in hot concrete and mass concrete construction.
（従来技術とその問題点）
コンクリートは、暑中に製造すると練り上り温度が高く
なり、同一コンシステンシーを得るための単位本漬が増
大し、同−水セメント比とするのに要する単位セメント
場も増加する。また暑中コンクリートは運搬中のスラン
プの低下も大きくなり、単位水但、セメント量をさらに
増さなければならない。これは不経済であるばかりでな
く、セメントの発熱による温度上昇を増加させるし、乾
燥収縮も大きくなり、そのためクラックの発生などの欠
陥を生じやすくなる。さらに硬化も早くなり、そのため
打ち継ぎに許される時間が短くなり、施工が困難となる
。(Prior art and its problems) When concrete is manufactured in the heat of the year, the mixing temperature increases, the amount of per unit soaking required to obtain the same consistency increases, and the unit cement field required to achieve the same water-cement ratio also increases. To increase. In addition, the slump of concrete during hot weather during transport increases, and the amount of cement per unit of water must be further increased. This is not only uneconomical, but also increases the temperature rise due to heat generation of the cement, and also increases drying shrinkage, making it more likely to cause defects such as cracks. Furthermore, it hardens more quickly, which reduces the time allowed for pouring and makes construction difficult.
また、マスコンクリートにおいては、コンクリートが熱
の不良導体であることもあって、硬化発熱にともなって
内部温度が上昇し、内部と外表面との温度差が大きくな
り、表面クラックが発生しやすくなる。また外部からコ
ンクリートが拘束されていると、硬化後の湯度降下によ
って生じる収縮が拘束されるので、大きな引張応力が発
生する。In addition, in mass concrete, since concrete is a poor conductor of heat, the internal temperature rises as it hardens and generates heat, increasing the temperature difference between the inside and the outside surface, making surface cracks more likely to occur. . Furthermore, if the concrete is restrained from the outside, the shrinkage caused by the drop in temperature after hardening is restrained, resulting in large tensile stress.
このような理由から、暑中コンクリートやマスコンクリ
ートの温度を低下させる何らかの対策が必要で、セメン
トの水和反応の発熱による温度上昇をできるだけ抑制す
る必要がある。For these reasons, it is necessary to take some measure to lower the temperature of hot concrete or mass concrete, and it is necessary to suppress the temperature rise due to heat generated by the hydration reaction of cement as much as possible.
従来、コンクリートの練り上り温度を低く抑えるために
、セメントや骨材などの材料を冷水を用いて冷Ｗしてお
いたり、コンクリート混合胴水に氷を投入して冷却する
などの方法が採られていた。Conventionally, in order to keep the mixing temperature of concrete low, methods such as cooling materials such as cement and aggregate with cold water, or cooling the concrete by adding ice to the concrete mixing tank water have been adopted. was.
また、コンクリート打設場所に冷却パイプを配設してお
き、打設中および直後にこのパイプに冷水を通し、コン
クリートの内部温度を低下させる方法も採られていた。Another method has been to install a cooling pipe at the concrete pouring site and run cold water through the pipe during and immediately after pouring concrete to lower the internal temperature of the concrete.
しかし、セメントや骨材などの材料を冷水で冷却する方
法は、冷水を得るための大規模な冷却設備を必要とする
割りには冷却効果は大ぎくなく、またコンクリート品質
管理も難しい。また混合胴水を氷で冷却する方法も大規
模な製氷設備が必要であるし、コンクリートの温度と水
分量を適切に管理するのが難しい。いずれにしても従来
方法では、多量のコンクリートを十分な低温まで適切に
かつ能率良く冷却づることは困難であった。However, the method of cooling materials such as cement and aggregates with cold water requires large-scale cooling equipment to obtain cold water, but the cooling effect is not great, and concrete quality control is also difficult. Furthermore, the method of cooling the mixing tank water with ice requires large-scale ice-making equipment, and it is difficult to appropriately control the temperature and moisture content of the concrete. In any case, with conventional methods, it is difficult to cool a large amount of concrete to a sufficiently low temperature in an appropriate and efficient manner.
（発明の目的）
この発明は上述した従来の問題点に鑑みなされたもので
、その目的は、大規模な設備を必要とばす、しかも運転
経費も少なく、コンクリートの練り混ぜ時に十分な低温
まで効率よく練り上り温度を低下させることができるよ
うにしたコンクリート冷却用ミキサーを提供することに
ある。(Purpose of the Invention) This invention was devised in view of the above-mentioned problems of the conventional technology.The purpose of this invention is to efficiently reduce the temperature to a sufficiently low temperature when mixing concrete, which requires large-scale equipment, and has low operating costs. To provide a concrete cooling mixer capable of lowering the mixing temperature.
（発明の構成）
この発明に係るコンクリート冷却用ミキサーは、コンク
リート材料の投入およびコンクリートの排出を行なう開
口部に密閉蓋を設けて、コンクリート混線時に混合胴の
内部を密閉できるように構成するとともに、上記密閉蓋
も含めて当該混合胴を少なくとも２０ｋ（１／ｃｒｌの
内圧に耐える耐圧構造とし、当該混合胴に、コンクリー
ト冷却用の冷媒としての液化ガスを内部に供給するノズ
ル部と、内部のガス圧が設定値を超えたときに内部ガス
を外部に放出する安全弁とを設けたものである。(Structure of the Invention) The concrete cooling mixer according to the present invention is configured such that a sealing lid is provided at the opening for introducing concrete material and discharging concrete, so that the inside of the mixing barrel can be sealed when concrete is mixed. The mixing cylinder, including the airtight lid, has a pressure-resistant structure that can withstand an internal pressure of at least 20k (1/crl), and the mixing cylinder has a nozzle section that supplies liquefied gas as a refrigerant for cooling concrete to the inside, and an internal gas It is equipped with a safety valve that releases internal gas to the outside when the pressure exceeds a set value.
（実 施 例）
図はこの発明の一実施例によるコンクリート冷却用ミキ
ナーの構造を示している。この実施例は回転胴型可傾式
ミキサーである。混合胴１０は支持台１２に取付けられ
ており、中心軸Ｐの囲りに矢印ａのように回転自在であ
るとともに、軸Ｐと直交する支持軸１６を中心に矢印す
のように傾倒可能になっている。図のように混合胴１０
の軸Ｐを水平に対して若干傾けた状態で、混合胴１０が
モータ１４とギア機構を介して結合するようになってお
り、この状態でモータ１４によって矢印ａのように回転
する。(Embodiment) The figure shows the structure of a mixer for cooling concrete according to an embodiment of the present invention. This embodiment is a rotating barrel tilting mixer. The mixing cylinder 10 is attached to a support stand 12, and is rotatable around a central axis P as shown by the arrow a, and can also be tilted as shown by the arrow around a support shaft 16 orthogonal to the axis P. It has become. Mixing cylinder 10 as shown
The mixing cylinder 10 is connected to a motor 14 via a gear mechanism with its axis P slightly tilted with respect to the horizontal. In this state, the mixing cylinder 10 is rotated by the motor 14 as shown by arrow a.
混合１１ｉ１１０は一端のみが開口した壺型をなしてお
り、その開口部１０ａからコンクリート材料を投入する
とともに、練り上ったコンクリートを排出するようにな
っている。混合胴１０の開口部１Ｑａには密閉Ｍ１８が
装着される。密閉蓋１８は混合胴１０に対して着脱式に
構成してもよいし、混合１１１０と蝶番機構で結合して
もよい。いずれにしても、コンクリート材料の役人時お
よび練り上りコンクリートの排出時には密閉蓋１８を開
ぎ、開口部１０ａを大きく開口させる。そしてコンクリ
ート混線時には、密閉蓋１８で開口部１０ａを塞ぎ、ハ
ンドル１８ａによって密閉蓋１８を締め付けて混合胴１
０の内部空間を密閉できるようになっている。The mixing unit 11i110 has a pot shape with only one end open, and concrete material is introduced through the opening 10a, and mixed concrete is discharged from the mixing unit 11i110. A seal M18 is attached to the opening 1Qa of the mixing barrel 10. The sealing lid 18 may be configured to be detachable from the mixing barrel 10, or may be connected to the mixing barrel 1110 by a hinge mechanism. In any case, when preparing the concrete material and discharging the mixed concrete, the sealing lid 18 is opened to widen the opening 10a. When concrete is mixed, the opening 10a is closed with the sealing lid 18, and the sealing lid 18 is tightened with the handle 18a.
0's internal space can be sealed.
密閉蓋１８には混合胴１０の内外を連通さＵるための安
全弁２０が設けられている。この安全弁２８は、後述す
るように密閉された混合胴１０の内部圧力が設定値を超
えた時に開き、内部のガスを外部に放出して内部圧力を
設定値に保つように作用する。The sealing lid 18 is provided with a safety valve 20 for communicating the inside and outside of the mixing barrel 10. As will be described later, the safety valve 28 opens when the internal pressure of the sealed mixing barrel 10 exceeds a set value, and acts to release internal gas to the outside and maintain the internal pressure at the set value.
この実施例では、安全弁２０の作動圧を３５ｋｇ／Ｃシ
とする。そして上記密閉蓋１８をも含めた混合胴１０は
、安全弁２０の作動圧より少し高い少なくとも４０ｋｇ
／ｃｄの内圧に耐える耐圧構造としている。勿論、混合
胴１０の耐圧は高いほど良く、最低でも２０に！Ｊ／ｃ
ｒｔは必要である。In this embodiment, the operating pressure of the safety valve 20 is 35 kg/C. The mixing barrel 10 including the sealing lid 18 has a pressure of at least 40 kg, which is slightly higher than the operating pressure of the safety valve 20.
It has a pressure-resistant structure that can withstand an internal pressure of /cd. Of course, the higher the pressure resistance of the mixing cylinder 10, the better, and at least 20! J/c
rt is required.
壺型の混合胴１０の内底部の中心には液体チッ素噴射用
のノズル２２が取付けられている。ノズル２２はパイプ
状をなしており、混合胴１０の軸Ｐｌ、：沿って取付け
られており、その先端部分の周囲に多数の孔が設けられ
ている。A nozzle 22 for injecting liquid nitrogen is attached to the center of the inner bottom of the pot-shaped mixing barrel 10. The nozzle 22 has a pipe shape, is attached along the axis Pl of the mixing cylinder 10, and has a large number of holes around its tip.
ノズル２２の基部は混合胴１０の外面側に連通してＪ５
す、ここに回転継手２４が取付けられている。The base of the nozzle 22 communicates with the outer surface side of the mixing cylinder 10 and
A rotary joint 24 is attached here.
この実施例ではコンクリート冷却用の冷媒として液体チ
ッ素を使用する。液体チッ素はタンク３０に蓄えられて
おり、タンク３０の吐出弁２８と上記回転継手２４とが
耐圧ホース２６で結ばれている。弁２８を適宜に開くと
、タンク３０から液体チッ素が吐出し、ホース２６２回
転継手２４を通ってノズル２２に供給され、ノズル２２
の孔から混合胴１０内に液体チッ素が噴出する。In this embodiment, liquid nitrogen is used as a refrigerant for cooling concrete. Liquid nitrogen is stored in a tank 30, and the discharge valve 28 of the tank 30 and the rotary joint 24 are connected with a pressure hose 26. When the valve 28 is opened appropriately, liquid nitrogen is discharged from the tank 30 and supplied to the nozzle 22 through the hose 262 and the rotary joint 24.
Liquid nitrogen is ejected into the mixing barrel 10 from the holes.
以上の構成において、混合胴１０内にコンクリート材料
を投入し、密閉蓋１８で開口部１０ａを完全に密閉し、
モータ１４を駆動して混合胴１０を回転させ、コンクリ
ートの練り混ぜを行なう。In the above configuration, concrete material is put into the mixing barrel 10, the opening 10a is completely sealed with the sealing lid 18,
The motor 14 is driven to rotate the mixing cylinder 10 to mix concrete.
そのとき同時に弁２８を開き、液体チッ素をノズル２２
から混合胴１０内に噴出し、練り混ぜ中のコンクリート
材料に吹き付ける。適宜ｍの液体チツ素を混合１１１０
内に供給したならば、弁２８を閉じて供給を停止しても
よい。At the same time, the valve 28 is opened and liquid nitrogen is introduced into the nozzle 22.
It is ejected into the mixing cylinder 10 and sprayed onto the concrete material being mixed. Mix appropriate amount of liquid nitrogen 1110
Once the water has been supplied to the inside, the valve 28 may be closed to stop the supply.
ノズル２２から噴出した液体チッ素は混合胴１０内で気
化し、その潜熱および顕然でもって周囲の熱を奪い、練
り混ぜ中のコンクリートを急速に冷却する。気化膨張し
たチッ素ガスによって密閉された混合胴１０内の圧力は
上昇し、３５ｋ（＋／ｃｄの圧力になると安全弁２０が
作動して内部ガスを徐々に逃がし、内部を３５ｋ ｇ／
ｃｄの圧力にほぼ保つ。The liquid nitrogen ejected from the nozzle 22 vaporizes within the mixing barrel 10, absorbs surrounding heat with its latent heat and apparent heat, and rapidly cools the concrete being mixed. The pressure inside the sealed mixing cylinder 10 rises due to the vaporized and expanded nitrogen gas, and when the pressure reaches 35 kg (+/cd), the safety valve 20 operates to gradually release the internal gas, causing the internal gas to rise to 35 kg/cd.
Maintain approximately CD pressure.
周知のように、常圧下において液体チッ素は気化した時
点で元の体積の１８０倍の体積になり、ざらに０℃まで
温度が上昇すると液体時点の体積に対して６４０倍もの
体積膨張を起こす。従って、通常のミキサーのような開
放型の空間に液体チッ素を導入して内部のコンクリート
を冷却しようとしても、著しい体積膨張を起こしたチッ
素ガスがコンクリートを収容した空間から大気中に散逸
してしまい、液体チッ素あるいはチッ素ガスのもつ冷熱
を十分に活用できず、冷却効果をあまり高めることがで
きない。As is well known, under normal pressure, liquid nitrogen becomes 180 times its original volume when it vaporizes, and when the temperature rises to roughly 0°C, the volume expands 640 times compared to its liquid state. . Therefore, even if liquid nitrogen is introduced into an open space like a normal mixer to cool the concrete inside, the nitrogen gas, which has undergone significant volume expansion, will dissipate into the atmosphere from the space containing the concrete. As a result, the cold energy of liquid nitrogen or nitrogen gas cannot be fully utilized, and the cooling effect cannot be improved much.
しかしこの発明のミキサーによれば、高圧に耐え１９る
構造の密閉された混合Ｉｊｉ１０の内部で液体チッ素を
気化させ、内圧が相当高くなるまでチッ素ガスを外部に
逃がさないので、液体チッ素あるいはチッ素ガスの有し
ていた冷熱を十分利用することができ、練り混ぜ中のコ
ンクリートを少ない経費で効率良く十分な低温まで冷却
できるのである。However, according to the mixer of the present invention, liquid nitrogen is vaporized inside the sealed mixing device 10, which has a structure that can withstand high pressure, and the nitrogen gas is not released to the outside until the internal pressure becomes considerably high. Alternatively, the cooling energy possessed by nitrogen gas can be fully utilized, and the concrete being mixed can be efficiently cooled down to a sufficiently low temperature at a low cost.
なお、上記の実施例は回転胴型可傾式ミキサーであった
が、この発明はこの形式のミキサーに限定されるもので
はなく、コンクリート混線時に混合胴内を密閉できる構
造であれば本発明を適用できる。Although the above embodiment was a rotary barrel type tilting mixer, the present invention is not limited to this type of mixer, and the present invention can be applied to any structure that can seal the inside of the mixing barrel during concrete mixing. Applicable.
（発明の効果）
以上詳細に説明したように、この発明に係るコンクリー
ト冷却用ミキサーによれば、大規模な付帯設備は必要な
く、冷媒である液化ガスの冷熱を無駄にすることなく効
率よく利用し、練り混ぜ中のコンクリートを非常に効果
的に冷却でき、少ない運転経費で十分温度の低いコンク
リートを能率良く製造できる。(Effects of the Invention) As explained in detail above, according to the concrete cooling mixer according to the present invention, there is no need for large-scale incidental equipment, and the cooling energy of the liquefied gas as a refrigerant is efficiently used without wasting it. The concrete that is being mixed can be cooled very effectively, and concrete at a sufficiently low temperature can be efficiently produced with low operating costs.
図はこの発明の一実施例によるコンクリート冷却用ミキ
サーの構成図である。The figure is a configuration diagram of a concrete cooling mixer according to an embodiment of the present invention.
Claims (1)
出を行なう開口部に密閉蓋を設けて、コンクリート混練
時に混合胴の内部を密閉できるように構成するとともに
、上記密閉蓋も含めて当該混合胴を少なくとも２０ｋｇ
／ｃｍ＾２の内圧に耐える耐圧構造とし、当該混合胴に
コンクリート冷却用の冷媒としての液化ガスを内部に供
給するノズル部と、内部のガス圧が設定値を超えたとき
に内部ガスを外部に放出する安全弁とを設けたことを特
徴とするコンクリート冷却用ミキサー。(1) A sealing lid is provided at the opening for introducing concrete materials and discharging concrete, so that the inside of the mixing barrel can be sealed during concrete mixing, and the mixing barrel including the sealing lid has a weight of at least 20 kg.
It has a pressure-resistant structure that can withstand an internal pressure of /cm^2, and has a nozzle part that supplies liquefied gas as a refrigerant for concrete cooling to the mixing cylinder, and a nozzle part that supplies internal gas to the outside when the internal gas pressure exceeds a set value. A mixer for cooling concrete, characterized in that it is equipped with a safety valve that releases water to the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26258985A JPS62122710A (en) | 1985-11-25 | 1985-11-25 | Mixer for cooling concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26258985A JPS62122710A (en) | 1985-11-25 | 1985-11-25 | Mixer for cooling concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62122710A true JPS62122710A (en) | 1987-06-04 |
Family
ID=17377899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26258985A Pending JPS62122710A (en) | 1985-11-25 | 1985-11-25 | Mixer for cooling concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62122710A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS645806A (en) * | 1987-06-27 | 1989-01-10 | Shimizu Construction Co Ltd | Method and device for manufacturing concrete |
| JP2016510274A (en) * | 2013-02-04 | 2016-04-07 | コールドクリート インコーポレイテッドＣｏｌｄｃｒｅｔｅ，Ｉｎｃ． | System and method for applying carbon dioxide in the production of concrete |
| US9758437B2 (en) | 2013-06-25 | 2017-09-12 | Carboncure Technologies Inc. | Apparatus for delivery of carbon dioxide to a concrete mix in a mixer and determining flow rate |
| US10246379B2 (en) | 2013-06-25 | 2019-04-02 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
| US10350787B2 (en) | 2014-02-18 | 2019-07-16 | Carboncure Technologies Inc. | Carbonation of cement mixes |
| US10570064B2 (en) | 2014-04-07 | 2020-02-25 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
| US10654191B2 (en) | 2012-10-25 | 2020-05-19 | Carboncure Technologies Inc. | Carbon dioxide treatment of concrete upstream from product mold |
| WO2021025569A1 (en) * | 2019-08-02 | 2021-02-11 | Zecevic Zeljko | Device and procedure for cooling fresh concrete at elevated temperatures |
| US10927042B2 (en) | 2013-06-25 | 2021-02-23 | Carboncure Technologies, Inc. | Methods and compositions for concrete production |
| US11660779B2 (en) | 2016-04-11 | 2023-05-30 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
| US11958212B2 (en) | 2017-06-20 | 2024-04-16 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
-
1985
- 1985-11-25 JP JP26258985A patent/JPS62122710A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS645806A (en) * | 1987-06-27 | 1989-01-10 | Shimizu Construction Co Ltd | Method and device for manufacturing concrete |
| US10654191B2 (en) | 2012-10-25 | 2020-05-19 | Carboncure Technologies Inc. | Carbon dioxide treatment of concrete upstream from product mold |
| US9790131B2 (en) | 2013-02-04 | 2017-10-17 | Carboncure Technologies Inc. | System and method of applying carbon dioxide during the production of concrete |
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