JPS61201681A - Method of cooling aggregate and apparatus therefor - Google Patents
Method of cooling aggregate and apparatus thereforInfo
- Publication number
- JPS61201681A JPS61201681A JP60041030A JP4103085A JPS61201681A JP S61201681 A JPS61201681 A JP S61201681A JP 60041030 A JP60041030 A JP 60041030A JP 4103085 A JP4103085 A JP 4103085A JP S61201681 A JPS61201681 A JP S61201681A
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- cooling
- temperature
- liquefied gas
- concrete
- 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
- 238000001816 cooling Methods 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 8
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
- B28C7/0023—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust by heating or cooling
- B28C7/0038—Cooling, e.g. using ice
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
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）
本発明は、セメント、水などと混練してコンクリートの
構成部材として用いられる骨材の冷却方法およびその実
施に使用される装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for cooling aggregate used as a component of concrete by mixing it with cement, water, etc., and an apparatus used for carrying out the cooling method.
（従来の技術）
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水量が増
大し、同−水セメント比とするに要する単位セメント量
も増加する。また、運搬中のスランプの低下も大きくな
り、単位水量、セメントｍをさらに増やさなければなら
ない。これは不経演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化さＶ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る可能性
が大きくなる。さらに、硬化も早くなり、打ら継ぎに許
される時間が短くなり、施工が困難となる。(Prior Art) When concrete is manufactured in hot weather, the mixing temperature becomes high, the unit amount of water required to obtain the same consistency increases, and the unit amount of cement required to achieve the same water-cement ratio also increases. In addition, the drop in slump during transportation becomes large, and the unit amount of water and cement m must be further increased. This is not only undesirable, but also increases the temperature rise due to heat generation of the cement, and also increases drying shrinkage, which increases the possibility of defects such as cracks occurring. In addition, it hardens quickly, reducing the time allowed for pour joints and making 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
内廊温度が上昇し、内部と外表面との温度差が大きくな
り、表面クランクの発生が生じやすい。また外部からコ
ンクリートが拘束されていると、硬化後の温度隣下によ
って生ずる収縮が拘束され、大きな引張応力が発止する
。In addition, in mass concrete, since concrete is a poor conductor of heat, the temperature in the inner hallway increases as it hardens and generates heat, increasing the temperature difference between the inside and outside surfaces, resulting in the occurrence of surface cranks. Cheap. Furthermore, if the concrete is restrained from the outside, the shrinkage caused by the temperature after hardening will be restrained, and large tensile stress will occur.
このような理由から、暑中コンクリートやマスコンクリ
ートについては、練り上り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ある。For these reasons, for hot summer concrete and mass concrete, some kind of measure is needed to lower the temperature of the mixed concrete.
従来、コンクリートの練り上り温度を低く押えるために
、セメント、骨材、水などの材料を冷却したり、練り混
ぜ水に砕氷を使用するなどの方法が採られてきた。Conventionally, methods have been used to keep the mixing temperature of concrete low, such as cooling materials such as cement, aggregate, and water, and using crushed ice in the mixing water.
（発明が解決しようとする問題点）
コンクリート材料を個別に冷却する方法は、冷却設備の
大規模化および運転コストの大幅なアップを招くだけで
なく、個別の温度管理を必要としてコンクリートの品質
°管理が複雑化する。(Problems to be Solved by the Invention) The method of cooling concrete materials individually not only leads to an increase in the scale of cooling equipment and a significant increase in operating costs, but also requires individual temperature control, which reduces the quality of concrete. Management becomes more complex.
一方、砕氷を使用すると、大規模な製氷機を必要とする
だけでなく、砕氷の融解によってコンクリートのコンシ
スチンシーが変動するため、品質を一定に維持すること
が難しい。On the other hand, using crushed ice not only requires a large-scale ice maker, but also makes it difficult to maintain constant quality because the consistency of the concrete fluctuates as the crushed ice melts.
また、特に骨材は混線されたコンクリート中で比較的大
きな容積を占め、これだけを冷却してもコンクリートの
温度を低下させることが期待できるが、水あるいは砕氷
による冷却では、十分な冷却効果が得られなかった。In addition, aggregate in particular occupies a relatively large volume in mixed concrete, and cooling only this aggregate can be expected to lower the temperature of the concrete, but cooling with water or crushed ice does not provide a sufficient cooling effect. I couldn't.
この発明は、上述した従来の問題点に鑑みてなされたも
のであって、その目的は、冷却源として非常−に簡便な
液化ガスを使用し、コンクリートの構成材料である骨材
を、これが混練されて作られる生コンクリートの温度を
効果的に低下させる温度まで冷却できる方法および装置
を提供することにある。This invention was made in view of the above-mentioned conventional problems, and its purpose is to use a very simple liquefied gas as a cooling source, and to use this to knead aggregate, which is a constituent material of concrete. The object of the present invention is to provide a method and apparatus capable of cooling fresh concrete to a temperature that effectively lowers the temperature of fresh concrete.
（問題点を解決するための手段）
上記目的を達成するため、この発明は骨材の冷却方法と
して、セメント、水などと混練してコンクリートの構成
部材として用いられる骨材中に混練前に液化ガスを注入
し−Ｃ冷却することを特徴とし、冷却装置として、積重
された骨材中に挿入される二重管からなり、該二重管の
内管には液化ガスを注入する一方、該二重管の外管には
該液化ガスよりも高温の気体を注入し、該液化ガスと該
気体とが混合状態で該骨材に噴射されることを特徴とす
る。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for cooling aggregate, in which the aggregate is mixed with cement, water, etc. and liquefied before being mixed into the aggregate used as a component of concrete. It is characterized by injecting gas for -C cooling, and the cooling device consists of a double pipe inserted into the stacked aggregates, while liquefied gas is injected into the inner pipe of the double pipe, A gas having a higher temperature than the liquefied gas is injected into the outer tube of the double pipe, and the liquefied gas and the gas are injected into the aggregate in a mixed state.
（作 用）
骨材中に注入された液化ガスは、蒸発するときに極めて
大きな冷却作用が得られ、骨材を相当低温まで冷却でき
る。(Function) The liquefied gas injected into the aggregate has an extremely large cooling effect when it evaporates, and can cool the aggregate to a considerably low temperature.
このようにして冷却された骨材と、セメント。Aggregate and cement cooled in this way.
水、添加剤などとを混練すると、混練コンクリートの温
度を適温まで低下させることができる。When mixed with water, additives, etc., the temperature of the mixed concrete can be lowered to an appropriate temperature.
また、冷却装置では、液化ガスの注入される内管の周囲
にそれよりも高温の気体が注入される外管で覆っている
ため、噴出部分の凍結が防止される。Furthermore, in the cooling device, the inner tube into which the liquefied gas is injected is surrounded by an outer tube into which gas at a higher temperature than the inner tube is injected, so that freezing of the spouting portion is prevented.
（実 施 例）
以下、この発明の好適な実施例について添附図面を参照
にして詳細に説明する。(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第１図および第２図は、この発明に係る冷却装置の一実
施例を示しており、特に第１図は装置を設置して骨材１
０を冷却する場合の全体図である。1 and 2 show an embodiment of the cooling device according to the present invention. In particular, FIG. 1 shows an embodiment of the cooling device according to the present invention.
FIG. 2 is an overall view when cooling 0.
同図における冷却装置は、いわゆる野積状態で積重され
た骨材１０中に挿入される二重管１２を基本的構造とし
ており、二重管１２は、ともに先端が閉塞した中空円筒
状の内管１４と外管１６とを同心状に配設したものであ
って、外管１６の先端は挿入し易いように尖っている。The cooling device shown in the figure has a basic structure of a double pipe 12 inserted into aggregates 10 piled up in a so-called open pile state. A tube 14 and an outer tube 16 are arranged concentrically, and the tip of the outer tube 16 is sharp for easy insertion.
上記外管１６の周壁には、多数の透孔１６ａが穿設され
ており、各透孔１６ａには、内管１４の外周面に突設さ
れたノズル１８が、近接開口している。A large number of through holes 16a are bored in the peripheral wall of the outer tube 16, and a nozzle 18 protruding from the outer peripheral surface of the inner tube 14 opens adjacent to each through hole 16a.
また、”内管１４の上端は、液化ガスＡが収納されたタ
ンク２０と、調整弁２２を介してバイブ接続され、外管
１６はコンブレブザー２４．冷却器２６と調整弁２８を
介してパイプ接続されている。The upper end of the inner pipe 14 is connected to a tank 20 containing liquefied gas A via a regulating valve 22, and the outer pipe 16 is connected to a pipe via a combination buzzer 24, a cooler 26, and a regulating valve 28. It is connected.
なお、上記内管１４およびこれとタンク２０を接続する
パイプ、外管１６などの内周面には断熱材を貼着してお
く。Note that a heat insulating material is pasted on the inner peripheral surfaces of the inner tube 14, the pipe connecting it to the tank 20, the outer tube 16, and the like.
また、第１図中に示す符号３０は、骨材１０中に埋設さ
れた温度センサであって、検出した温度によって上記調
整弁２２．２８の開口度合を制御器２９によってコント
ロールする。Further, reference numeral 30 shown in FIG. 1 is a temperature sensor embedded in the aggregate 10, and the degree of opening of the regulating valves 22, 28 is controlled by the controller 29 according to the detected temperature.
以上の構成を備えた冷却装置を第１図に示すようにセッ
トして、内管１４内に液化ガスＡ、例えば窒素や二酸化
炭素を液体化したものを注入し、外管１６内にコンプレ
ッサー２４から圧縮空気Ｂを注入すると、第２図に示す
ように、内管１４のノズル１８から外管１６の透孔１６
ａに向けて液化ガス八が噴出され、これと同時に噴出液
化ガスの周囲を取り囲むようにして圧縮空気Ｂも透孔１
６ａから外部の骨材１０に向けて噴射される。The cooling device having the above configuration is set as shown in FIG. When compressed air B is injected from the nozzle 18 of the inner tube 14 to the through hole 16 of the outer tube 16, as shown in FIG.
Liquefied gas 8 is spouted toward hole 1, and at the same time, compressed air B also flows through hole 1, surrounding the spouted liquefied gas.
6a toward the external aggregate 10.
噴射された液化ガス△と圧縮空気Ｂとは、骨材１０の間
隙を縫うようにして拡散し、液化ガスＡが蒸発する時に
骨材１０から熱を奪い、骨材１０を十分に冷却する。The injected liquefied gas Δ and compressed air B diffuse through the gaps between the aggregates 10, remove heat from the aggregates 10 when the liquefied gas A evaporates, and cool the aggregates 10 sufficiently.
骨材１０の冷却温度は、温度セン１す３０で測定し、測
定結果に基づい°て調整弁２２．２８を制御する。The cooling temperature of the aggregate 10 is measured by a temperature sensor 130, and the regulating valves 22, 28 are controlled based on the measurement results.
ここで、上記外管１６内に注入される圧縮空気Ｂは、ノ
ズル１８から噴射される液化ガスＡの冷却作用で、骨材
１０の水分が凍結してノズル１８開口が閉塞することを
防止する作用と、液化ガスＡを骨材１０の間隙中に広く
到達させる作用を併せ持つことになるが、通常、上記コ
ンプレッサー２２より得られる圧縮空気Ｂは高温となる
ため、必要に応じて液化ガスＡよりも高い温度まで冷却
器２６によって冷やす。Here, the compressed air B injected into the outer tube 16 prevents the water in the aggregate 10 from freezing and blocking the opening of the nozzle 18 due to the cooling effect of the liquefied gas A injected from the nozzle 18. However, since the compressed air B obtained from the compressor 22 is usually at a high temperature, the liquefied gas A can be used as needed. It is also cooled down to a high temperature by the cooler 26.
さて、以上のような装置を用いて骨材十〇を冷却すると
、従来の水や砕氷などと異なり、骨材１０を十分に冷却
することができ、冷却された骨材１０をセメント、水な
どと混練すると、適度に温度を低下させた生コンクリー
トが得られる。Now, when aggregate 10 is cooled using the above-mentioned device, unlike conventional methods such as water and crushed ice, aggregate 10 can be sufficiently cooled, and the cooled aggregate 10 can be used in cement, water, etc. When kneaded with, ready-mixed concrete with an appropriately reduced temperature can be obtained.
また、冷却に用いる液化ガスＡは、タンク２０゜あるい
はボンベなどに収納されていて、従来のように大規模な
設備が不要であって、運転コストも低く、しかも、骨材
１０を冷却した後は残留せず、骨材１０の性状に何ら影
響を及ぼすことなく十分に冷却できる。In addition, the liquefied gas A used for cooling is stored in a 20° tank or a cylinder, so there is no need for large-scale equipment like in the past, and the operating cost is low. does not remain and can be sufficiently cooled without affecting the properties of the aggregate 10.
さらに、本発明の冷却装置では、圧縮空気Ｂによって噴
射部分の凍結が防止され、骨材１０の冷却を円澗且つ確
実に行なえるとともに、骨材１０を冷却する液化ガス八
が、圧縮空気Ｂの噴出に伴われて骨材１０の間隙に広範
囲に拡散され、液化ガスＡの冷却効果を十分に発揮させ
る。Furthermore, in the cooling device of the present invention, the injection part is prevented from freezing by the compressed air B, and the aggregate 10 can be cooled circularly and reliably. As the liquefied gas A is ejected, it is widely diffused in the gaps between the aggregates 10, and the cooling effect of the liquefied gas A is fully exhibited.
なお、本発明の実施は、上述した野外に野積みされた骨
材１０だけでなく、第３図に示すように、容器３２内に
貯蔵された骨材１０にも勿論適用できる。Note that the present invention can of course be applied not only to the aggregate 10 piled up in the open as described above, but also to the aggregate 10 stored in a container 32 as shown in FIG.
このように貯蔵された骨材１０に用いると、容器３２の
断熱効果も利用でき、また、開閉ストッパ３４を開いて
冷却後の骨材１０を直ちにコンクリートミキサーなどに
投入できるため、より一層液化ガスＡの冷却効果を発揮
できる。When used with the aggregate 10 stored in this way, the heat insulating effect of the container 32 can be utilized, and the opening/closing stopper 34 can be opened to immediately throw the cooled aggregate 10 into a concrete mixer, etc. A cooling effect can be achieved.
また、上述した冷却装置は単体で使用するだけでなく、
複数本を並列的に骨材１０中に挿入して冷却してもよい
。In addition, the above-mentioned cooling device can not only be used alone, but also
A plurality of pieces may be inserted in parallel into the aggregate 10 and cooled.
（発明の効果） ”
以上実施例で詳細に説明したように、本発明の方法・装
置によれば、骨材をその性状に変化をきたすことなく十
分に冷却でき、冷却された骨材を用いて生コンクリート
の温度を適温に低下させることが可能となる。(Effects of the Invention) As explained in detail in the examples above, according to the method and apparatus of the present invention, aggregate can be sufficiently cooled without changing its properties, and the cooled aggregate can be used to This makes it possible to lower the temperature of fresh concrete to an appropriate temperature.
また、冷却装置は噴射部分の凍結が防止できるなど、各
種の優れた効果が得られる。In addition, the cooling device can provide various excellent effects such as preventing the injection part from freezing.
第１図および第２図はこの発明に係る方法・装置の一実
施例を示しており、第１図は全体説明図、第２図は装置
の要部拡大図である。
第３図はこの発明の他の実施例を示す要部拡大図である
。
１０・・・・・・骨 材 １２・・・・・・二重
管１４・・・・・・内 管 １６・・・・・・外
管１８・・・・・・ノズル ２０・・・・・・
タンク２２・・・・・・調整弁 ２４・・・・・
・コンプレッサー２６・・・・・・冷却器 ２８
・・・・・・調整弁３０・・・・・・温度センサFIGS. 1 and 2 show an embodiment of the method and apparatus according to the present invention, with FIG. 1 being an overall explanatory view and FIG. 2 being an enlarged view of the main parts of the apparatus. FIG. 3 is an enlarged view of main parts showing another embodiment of the present invention. 10... Aggregate 12... Double pipe 14... Inner pipe 16... Outer pipe 18... Nozzle 20...・・・
Tank 22...Adjusting valve 24...
・Compressor 26...Cooler 28
...Adjusting valve 30...Temperature sensor
Claims (2)
部材として用いられる骨材中に混練前に液化ガスを注入
して冷却することを特徴とする骨材の冷却方法。(1) A method for cooling aggregate, which is characterized by injecting liquefied gas into aggregate used as a component of concrete by mixing it with cement, water, etc. and cooling it before mixing.
とし、該二重管の内管には液化ガスを注入する一方、該
二重管の外管には該液化ガスよりも高温の気体を注入し
、該液化ガスと該気体とが混合状態で該骨材に噴射され
ることを特徴とする骨材の冷却装置。(2) The basic structure is a double pipe inserted into the piled aggregate, and liquefied gas is injected into the inner pipe of the double pipe, while the liquefied gas is injected into the outer pipe of the double pipe. 1. A cooling device for aggregates, characterized in that a gas having a higher temperature than the above temperature is injected, and the liquefied gas and the gas are injected into the aggregates in a mixed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60041030A JPS61201681A (en) | 1985-03-04 | 1985-03-04 | Method of cooling aggregate and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60041030A JPS61201681A (en) | 1985-03-04 | 1985-03-04 | Method of cooling aggregate and apparatus therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61201681A true JPS61201681A (en) | 1986-09-06 |
| JPH0369282B2 JPH0369282B2 (en) | 1991-10-31 |
Family
ID=12596997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60041030A Granted JPS61201681A (en) | 1985-03-04 | 1985-03-04 | Method of cooling aggregate and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61201681A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63154305A (en) * | 1986-12-19 | 1988-06-27 | 清水建設株式会社 | Manufacture of concrete |
| JPS63156045A (en) * | 1986-12-19 | 1988-06-29 | 清水建設株式会社 | Aggregate manufacturing apparatus |
| EP0272880A1 (en) * | 1986-12-19 | 1988-06-29 | SHIMIZU CONSTRUCTION Co. LTD. | Method of manufacturing concrete and apparatus therefor |
| JPS63319109A (en) * | 1987-06-23 | 1988-12-27 | Shimizu Constr Co Ltd | Method and apparatus for producing concrete |
| JPS645806A (en) * | 1987-06-27 | 1989-01-10 | Shimizu Construction Co Ltd | Method and device for manufacturing concrete |
| WO2002036523A1 (en) | 2000-11-03 | 2002-05-10 | Messer Griesheim Gmbh | Method and device for the production of concrete |
| EP3865271A1 (en) * | 2020-02-13 | 2021-08-18 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Wet concrete conditioning |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58209516A (en) * | 1982-05-31 | 1983-12-06 | 清水建設株式会社 | Cooling method of aggregate using slit pipe |
-
1985
- 1985-03-04 JP JP60041030A patent/JPS61201681A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58209516A (en) * | 1982-05-31 | 1983-12-06 | 清水建設株式会社 | Cooling method of aggregate using slit pipe |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63154305A (en) * | 1986-12-19 | 1988-06-27 | 清水建設株式会社 | Manufacture of concrete |
| JPS63156045A (en) * | 1986-12-19 | 1988-06-29 | 清水建設株式会社 | Aggregate manufacturing apparatus |
| EP0272880A1 (en) * | 1986-12-19 | 1988-06-29 | SHIMIZU CONSTRUCTION Co. LTD. | Method of manufacturing concrete and apparatus therefor |
| US5100239A (en) * | 1986-12-19 | 1992-03-31 | Shimizu Construction Co., Ltd. | Method of manufacturing concrete |
| JPS63319109A (en) * | 1987-06-23 | 1988-12-27 | Shimizu Constr Co Ltd | Method and apparatus for producing concrete |
| JPS645806A (en) * | 1987-06-27 | 1989-01-10 | Shimizu Construction Co Ltd | Method and device for manufacturing concrete |
| WO2002036523A1 (en) | 2000-11-03 | 2002-05-10 | Messer Griesheim Gmbh | Method and device for the production of concrete |
| EP3865271A1 (en) * | 2020-02-13 | 2021-08-18 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Wet concrete conditioning |
| WO2021160443A1 (en) * | 2020-02-13 | 2021-08-19 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Wet concrete conditioning |
| US12502648B2 (en) | 2020-02-13 | 2025-12-23 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Wet concrete conditioning |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0369282B2 (en) | 1991-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |