JPH01317707A - Preparation of cooled concrete kneaded mixture - Google Patents
Preparation of cooled concrete kneaded mixtureInfo
- Publication number
- JPH01317707A JPH01317707A JP14833688A JP14833688A JPH01317707A JP H01317707 A JPH01317707 A JP H01317707A JP 14833688 A JP14833688 A JP 14833688A JP 14833688 A JP14833688 A JP 14833688A JP H01317707 A JPH01317707 A JP H01317707A
- Authority
- JP
- Japan
- Prior art keywords
- mixer
- liquid nitrogen
- cooled
- mixture
- temp
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 16
- 239000011343 solid material Substances 0.000 claims abstract description 14
- 238000004898 kneading Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000008247 solid mixture Substances 0.000 claims abstract description 5
- 238000007580 dry-mixing Methods 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 15
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000013329 compounding Methods 0.000 abstract 2
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は冷却されたコンクリート混練物の製造法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a cooled concrete mix.
マスコンクリート構造物に発生する温度ひび割れの抑制
にはコンクリートの練り上がり温度を下げるプレクーリ
ング法が有効であると言われている。Pre-cooling methods that lower the temperature of concrete after mixing are said to be effective in suppressing temperature cracks that occur in mass concrete structures.
例えば特開昭６２−７４６０３号公報、特開昭６２−７
７９０７号公報および特開昭６３−４１６９号公報には
、液化窒素の気化するさいの冷却能をコンクリートのブ
レクーリングに利用しようとする発明が提案されている
。For example, JP-A-62-74603, JP-A-62-7
No. 7907 and Japanese Unexamined Patent Publication No. 63-4169 propose an invention that utilizes the cooling ability of liquefied nitrogen during vaporization for brecooling of concrete.
本発明の一つの目的は、液化窒素が気化するさいの冷却
能をコンクリートのブレクーリングに利用するさいに問
題となるコンクリート物性への悪影響を回避すること、
さらに一つの目的は、液化窒素の冷却能を既設設備内で
十分に引き出し且つ材料の均一な冷却が得られるように
すること、にある。One object of the present invention is to avoid adverse effects on the physical properties of concrete, which is a problem when using the cooling capacity of liquefied nitrogen when it evaporates for brecooling of concrete;
Another objective is to fully utilize the cooling ability of liquefied nitrogen within existing equipment and to achieve uniform cooling of materials.
前記の目的を達成せんとする本発明の要旨とするところ
は、冷却されたコンクリート混練物を製造するさいに、
先ず、配合水を添加する前の固体配合材料をミキサー内
で空練りしつつ、この空練り中の固体材料に噴霧ノズル
から液化窒素を吹付けることによって冷却された固体混
合物を製造し。The gist of the present invention, which aims to achieve the above object, is that when producing a cooled concrete mix,
First, a solid blended material before addition of blended water is dry-kneaded in a mixer, and a cooled solid mixture is produced by spraying liquefied nitrogen from a spray nozzle onto the solid material during dry-kneading.
次いで得られた冷却固体混合物に配合水を添加して混練
することを特徴とする。Then, blended water is added to the obtained cooled solid mixture and kneaded.
〔発明の詳細な
説明は、コンクリート混練物を製造する通常のコンクリ
ートミキサーを利用して実施することができる。第１図
に示したように、コンクリートミキサー１に蓋２を取付
け、この蓋２に排気ダクト３を取付けると共に噴霧ノズ
ル４を設置する。[The detailed description of the invention can be carried out using a conventional concrete mixer for producing a concrete mix. As shown in FIG. 1, a lid 2 is attached to a concrete mixer 1, an exhaust duct 3 is attached to the lid 2, and a spray nozzle 4 is installed.
この噴霧ノズル４は、第２図に図解的に示したように、
固定パイプ５の先端に２円盤体６を、パイプ５の軸回り
に回転自在に取付けたものであり。This spray nozzle 4, as schematically shown in FIG.
Two disk bodies 6 are attached to the tip of a fixed pipe 5 so as to be rotatable around the axis of the pipe 5.
この回転円盤体６には９円盤の接線方向に吐出方向を向
けたノズルロアが設けられ、このノズルロアが円盤体６
内の通路８を経て固定パイプ５に通じる構造のものであ
る。したがって、固定パイプ５内に液化窒素を供給する
と１円盤体６内の通路８を経てノズルロアから大気中に
吐出する。そのさい、液化窒素は大気中に瞬間的に膨張
気化してノズルロアから高速で噴射することになり、こ
の噴射圧によって円盤体６は固定パイプ５の軸回りに回
転する。This rotating disc body 6 is provided with a nozzle lower whose discharge direction is oriented in the tangential direction of the nine discs, and this nozzle lower is connected to the disc body 6.
It has a structure that leads to the fixed pipe 5 through a passage 8 inside. Therefore, when liquefied nitrogen is supplied into the fixed pipe 5, it is discharged into the atmosphere from the nozzle lower through the passage 8 in the disk body 6. At this time, the liquefied nitrogen momentarily expands and vaporizes in the atmosphere and is injected from the nozzle lower at high speed, and the disk body 6 rotates around the axis of the fixed pipe 5 due to this injection pressure.
このような噴射圧で自転する噴霧ノズル４と排気ダクト
３を通常のコンクリートミキサーｌに設置したうえ１本
発明においては先ずこのミキサーｌに、セメント、砂、
砂利などの固体材料を装入し、水を無添加のまま空練り
操作を行い、この空練り操作中において、噴霧ノズル４
に液化窒素容器から流量調整弁９を介して液化窒素を供
給する。In addition to installing the spray nozzle 4 and the exhaust duct 3, which rotate on their own axis with such injection pressure, in a normal concrete mixer 1, in the present invention, cement, sand,
A solid material such as gravel is charged and a dry kneading operation is performed without adding water, and during this dry kneading operation, the spray nozzle 4
liquefied nitrogen is supplied from the liquefied nitrogen container through the flow rate adjustment valve 9.
これによって、ミキサー１内で流動している固体材料に
噴霧ノズル４から低温の窒素ガスが吹付けられる。その
さい、噴霧ノズル４は前述のように液化窒素の噴射圧に
よって回転を続ける。したがって、特定の１箇所に液体
窒素が吹付けられるのではなく、固体材料の広いエリア
にわたってまんべんなく吹付けられる。しかも固体材料
はミキサー翼１０の回転によって流動を続けるから３局
所的な冷却ではなく材料全体にわたる均一な冷却が達成
される。この液化窒素の噴射を続行する限り。As a result, low-temperature nitrogen gas is sprayed from the spray nozzle 4 onto the solid material flowing within the mixer 1. At this time, the spray nozzle 4 continues to rotate due to the injection pressure of liquefied nitrogen as described above. Therefore, the liquid nitrogen is not sprayed at one specific location, but evenly over a large area of the solid material. Furthermore, since the solid material continues to flow due to the rotation of the mixer blades 10, uniform cooling over the entire material is achieved instead of local cooling. As long as we continue to inject this liquid nitrogen.
固体材料の温度はどこまでも冷却され続け、凍結の問題
やセメント変性の問題なく零℃以下とすることもできる
。実際には、ミキサー１の底部内壁温度を温度センサー
１１によって検出しつづけ・ この内壁温度が適切な温
度にまで低下したら空練りおよび液化窒素噴射操作を停
止すればよい。The temperature of the solid material continues to be cooled indefinitely, and can even be brought down to below zero degrees Celsius without problems of freezing or cement denaturation. In reality, the temperature sensor 11 continues to detect the temperature of the inner wall at the bottom of the mixer 1, and when the inner wall temperature drops to an appropriate temperature, the dry kneading and liquefied nitrogen injection operations are stopped.
この操作が終えたならば１次いでこの低温固体材料が存
在するミキサー１に配合水を添加して混練を行なう。ま
た混和剤の添加等も必要な場合は適宜行なう、配合水添
加後は液化窒素の噴射は特別の場合を除いて行わない、
すなわち、低温固定材料と水を混練することによって低
温の混線材料を製造する。そのさい、水を予め冷却して
おき。Once this operation is completed, blended water is then added to the mixer 1 in which the low-temperature solid material is present and kneaded. Also, add admixtures as needed, and do not spray liquefied nitrogen after adding mixed water, except in special cases.
That is, a low-temperature mixed wire material is manufactured by kneading a low-temperature fixing material and water. Before doing so, cool the water beforehand.
低温の水を配合水とすることも勿論有利である。Of course, it is also advantageous to use low temperature water as the formulation water.
この水の冷却には、排気ダクト３から排出する窒素ガス
を水対ガス熱交換器に導き、この熱交換器で水を冷却す
ることもできる。To cool this water, the nitrogen gas discharged from the exhaust duct 3 can be led to a water-to-gas heat exchanger, and the water can be cooled by this heat exchanger.
温度センサー１１による冷却された固体材料の温度と配
合水の温度を知ることによって、所定の関係式を用いて
練り上がり温度を推定することは当業者にとって簡単に
行なえる。したがって１本発明によると練り上り温度が
比較的簡単に推定でき温度管理が容易である。By knowing the temperature of the cooled solid material and the temperature of the blended water measured by the temperature sensor 11, a person skilled in the art can easily estimate the kneading temperature using a predetermined relational expression. Therefore, according to the present invention, the kneading temperature can be estimated relatively easily and temperature control is easy.
本発明は、液化窒素が気化するさいの冷却能をコンクリ
ート材料の空練りにおいて発現させるものであり、水の
非存在下での冷却であるから凍結の問題から開放される
。そして、既存のコンクリートミキサーに若干手を加え
るだけで、コンクリートのプレクーリング設備に改変で
きる。また。The present invention develops the cooling ability of liquefied nitrogen during vaporization during dry mixing of concrete materials, and since cooling is performed in the absence of water, the problem of freezing is avoided. With a few modifications, existing concrete mixers can be converted into concrete pre-cooling equipment. Also.
−たんプレクーリング設備に改変しても元のミキサーに
戻すことも自由に行なえる。従って１周年を通じて周囲
温度が高いときだけ選択的にブレクーリング操作を行う
といったことも可能である。-Even if it is converted into a pre-cooling equipment, it can be changed back to the original mixer freely. Therefore, it is possible to selectively perform the break cooling operation only when the ambient temperature is high throughout the first anniversary.
また、ミキサー中で噴霧ノズルを用いて空練りしつつ冷
却するから、冷却された部分と冷却されない部分が存在
するといったことは回避され、固体材料が均等に冷却さ
れる。しかもその冷却の程度を非常に強くすることもで
き且つ練り上がり温度の管理も容易である。従って、ダ
ム工事等のマスコンクリート構造物の構築にあたっての
温度ひび割れの問題を、その現場状況に応じて簡単且つ
合理的に防止することができる。Furthermore, since the solid material is cooled while dry kneading using a spray nozzle in the mixer, it is avoided that there are cooled portions and uncooled portions, and the solid material is cooled uniformly. Moreover, the degree of cooling can be made very strong, and the temperature after kneading can be easily controlled. Therefore, the problem of temperature cracking during construction of mass concrete structures such as dam construction can be easily and rationally prevented depending on the site conditions.
第１図は本発明を実施するためのコンクリートミキサー
の例を示した略図面図、第２図は第１図のミキサーに取
付ける噴霧ノズルの例を示す透視斜視図である。
１・・コンクリートミキサー、 ２・・蓋。
３・・排気ダクト、 ４・・噴霧ノズル、 ５・・
固定パイプ、 ６・・円盤体、 ７・・ノズル口、
９・・流１ｔｌｉ節弁。FIG. 1 is a schematic drawing showing an example of a concrete mixer for carrying out the present invention, and FIG. 2 is a transparent perspective view showing an example of a spray nozzle attached to the mixer shown in FIG. 1. Concrete mixer, 2. Lid. 3. Exhaust duct, 4. Spray nozzle, 5.
Fixed pipe, 6. Disc body, 7. Nozzle opening,
9. Flow 1tli valve.
Claims (1)
合水を添加する前の固体配合材料をミキサー内で空練り
しつつ、この空練り中の固体材料に噴霧ノズルから液化
窒素を吹付けることによって冷却された固体混合物を製
造し、この冷却固体混合物に配合水を添加して混練する
ことを特徴とする冷却されたコンクリート混練物の製造
法。When producing a cooled concrete mixture, the solid compound material before adding mixing water is dry kneaded in a mixer, and the solid material during dry mixing is cooled by spraying liquefied nitrogen from a spray nozzle. 1. A method for producing a cooled concrete mixture, comprising: producing a solid mixture, adding mixed water to the cooled solid mixture, and kneading the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14833688A JPH074812B2 (en) | 1988-06-17 | 1988-06-17 | Method for producing cooled concrete mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14833688A JPH074812B2 (en) | 1988-06-17 | 1988-06-17 | Method for producing cooled concrete mixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01317707A true JPH01317707A (en) | 1989-12-22 |
| JPH074812B2 JPH074812B2 (en) | 1995-01-25 |
Family
ID=15450489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14833688A Expired - Lifetime JPH074812B2 (en) | 1988-06-17 | 1988-06-17 | Method for producing cooled concrete mixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074812B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254508U (en) * | 1988-10-08 | 1990-04-19 | ||
| EP0741284A2 (en) * | 1995-05-02 | 1996-11-06 | Liebherr-Mischtechnik GmbH | Device for measuring the temperature of unset concrete |
| JP2008049499A (en) * | 2006-08-22 | 2008-03-06 | Taiheiyo Cement Corp | Agitator vehicle and ready-mixed concrete manufacturing control device |
| WO2008040674A1 (en) | 2006-10-04 | 2008-04-10 | Messer Group Gmbh | Method and device for the production of chilled fresh concrete |
| US10968141B2 (en) * | 2017-04-11 | 2021-04-06 | Showa Freezing Plant Co., Ltd. | Concrete manufacturing method using nitrogen dissolved water and method for manufacturing reinforced concrete structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103322746A (en) * | 2013-06-22 | 2013-09-25 | 中铁十八局集团第二工程有限公司 | Device for reducing temperature of mass concrete taken out from bin by using liquefied nitrogen gas |
-
1988
- 1988-06-17 JP JP14833688A patent/JPH074812B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0254508U (en) * | 1988-10-08 | 1990-04-19 | ||
| JPH0521373Y2 (en) * | 1988-10-08 | 1993-06-01 | ||
| EP0741284A2 (en) * | 1995-05-02 | 1996-11-06 | Liebherr-Mischtechnik GmbH | Device for measuring the temperature of unset concrete |
| EP0741284A3 (en) * | 1995-05-02 | 1996-11-20 | Liebherr-Mischtechnik GmbH | Device for measuring the temperature of unset concrete |
| JP2008049499A (en) * | 2006-08-22 | 2008-03-06 | Taiheiyo Cement Corp | Agitator vehicle and ready-mixed concrete manufacturing control device |
| WO2008040674A1 (en) | 2006-10-04 | 2008-04-10 | Messer Group Gmbh | Method and device for the production of chilled fresh concrete |
| EP2077933B1 (en) * | 2006-10-04 | 2012-02-01 | Messer Group GmbH | Method and device for the production of chilled fresh concrete |
| US10968141B2 (en) * | 2017-04-11 | 2021-04-06 | Showa Freezing Plant Co., Ltd. | Concrete manufacturing method using nitrogen dissolved water and method for manufacturing reinforced concrete structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH074812B2 (en) | 1995-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3583172A (en) | Cryogenic cooling of concrete | |
| AU597455B2 (en) | Method of manufacturing concrete and apparatus therefor | |
| JPH01317707A (en) | Preparation of cooled concrete kneaded mixture | |
| CN105837064A (en) | Method for making expanded, granular and lightweight aggregates from high titania-bearing blast furnace slag, and apparatus thereof | |
| US20040050301A1 (en) | Method and device for the production of concrete | |
| ES2381873T3 (en) | Procedure and device for the manufacture of refrigerated non-set concrete | |
| GB1454328A (en) | Method and apparatus for cooling and de-dusting hot particulate material | |
| JPS62122710A (en) | Mixer for cooling concrete | |
| JPH07108537B2 (en) | Method and apparatus for manufacturing cooling concrete by low temperature liquefied gas | |
| RU2297260C1 (en) | Foam generation device | |
| JP2847137B2 (en) | Concrete production method and production equipment | |
| JPH01120304A (en) | Concrete cooler for truck mixer | |
| JPH0369282B2 (en) | ||
| BRPI0312199B1 (en) | Dust deposition device | |
| JPH078490B2 (en) | Concrete mixer with cooling function | |
| JPS63319109A (en) | Method and apparatus for producing concrete | |
| JPH0854315A (en) | Hot airflow generator | |
| JPH0539845Y2 (en) | ||
| JPS6426406A (en) | Manufacture of cooled concrete due to injection of low-temperature liquefied gas | |
| JPH0562043B2 (en) | ||
| JP3199421B2 (en) | Concrete production method | |
| JP3143175B2 (en) | Concrete kneading equipment | |
| JP2819317B2 (en) | Cooling aggregate manufacturing equipment | |
| LUSTIG et al. | Combustion scaling and modeling gas mixing data in NRL 5000-liter facility with flow obstacle[Final Report] | |
| JP2001165542A (en) | Snow making machine |