JP4583792B2 - Cooling concrete production equipment - Google Patents

Description

The present invention relates in particular manufacturing ZoSo location suitable cooling concrete hot weather concrete.

  In hot concrete, where the daily average temperature exceeds 25 ° C, the hydration reaction of the cement accelerates and the solidification and hardening rate increases, and the slump decreases significantly over time. Not only does this rapidly evaporate, causing cold joints and cracks, but also has problems such as high initial strength but low long-term strength elongation. For this reason, the concrete temperature at the time of placing is determined to be within 35 ° C. (Japan Society of Civil Engineers), and the concrete temperature at the time of unloading is determined to be 35 ° C. or less (the Architectural Institute of Japan).

In order to solve the problems of the above-mentioned hot concrete, JP-A-8-309731 (Patent Document 1) discloses that aggregates (sand, gravel) cooled in advance to a predetermined temperature are kneaded with cement and water. A method for producing cooled concrete is disclosed. Japanese Patent Application Laid-Open No. 7-9432 (Patent Document 2) discloses a device for cooling cement, and kneaded the precooled cement together with aggregate and water to produce cooled concrete. Yes. Furthermore, Japanese Patent Application Laid-Open No. 9-314541 (Patent Document 3) discloses an apparatus for cooling kneaded water, and kneaded kneaded water preliminarily cooled together with cement and aggregate to produce cooled concrete. Has been.
JP-A-8-309731 JP 7-9432 A JP-A-9-314541

  As described above, conventional cooling concrete is manufactured by mixing and kneading the aggregate or kneading water that has been cooled to a predetermined temperature in advance, and manufacturing the cooling concrete.

  By the way, when manufacturing such cooled concrete, not only clean water but also recovered water (a general term for sludge water and supernatant water obtained by treating concrete waste water) is recognized as part or all of the kneaded water. (Use of sludge solids content within 3% of cement weight is specified in Appendix 3 Table 2 “Quality of recovered water” in JIS A5308). And since such recovered water is mixed with fine powder components of cement and aggregate, its cooling process is very difficult, and it is usually said that it can be directly blended at room temperature without cooling. . For this reason, the production of cooled concrete is adversely affected and it is difficult to produce satisfactory cooled concrete.

The present invention solves the conventional problems and can always reliably produce cooled concrete, and can produce cooled concrete by cooling the recovered water alone even when the aggregate cooled beforehand is not used. , it is intended to provide a manufacturing ZoSo location of cooling concrete.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is provided with a recovered water storage tank for supplying recovered water to a water meter constituting the cooling concrete manufacturing apparatus, An apparatus for producing cooling concrete, characterized in that a recovered water cooling tank is provided to supply cooling recovered water to the vessel, and the recovered water cooling tank is provided with a chiller for cooling the recovered water to a predetermined temperature. Is a summary.

In the invention according to claim 2 of the present invention , a fresh water storage tank is provided so that cooling water is supplied to the water meter, and a chiller for cooling the fresh water to a predetermined temperature is attached to the fresh water storage tank. The gist of the cooling concrete manufacturing apparatus according to claim 1, characterized in that:

Since the invention according to claim 1 is configured as described above, the recovered water is stored in the recovered water storage tank, and the recovered water cooled by the chiller is stored in the recovered water cooling tank while the cooling concrete is stored. Depending on the degree of cooling effect of the cooling water, the cooling and recovery
Alternatively, only cooled and recovered water can be supplied to a water meter and kneaded with other concrete materials by a mixer to always produce cooled concrete reliably. In addition, since recovered water and cooling recovered water are used as kneaded water, not only can industrial waste discharged from ready-mixed concrete factories be reduced, but also effective use of resources can be achieved. is there.

Since the invention according to claim 2 is configured as described above, the water meter is used as the kneaded water together with the recovered water or the cooled recovered water as necessary while storing the fresh water cooled by the chiller in the fresh water storage tank. It is possible to always produce cooling concrete by mixing with other concrete materials by a mixer .

The best mode for carrying out the present invention will be described below based on an embodiment shown in the drawings.

  1 and 2 show an embodiment of the present invention, in which 1 is a mixer constituting a cooling concrete manufacturing apparatus, 2 is a concrete hopper disposed below the mixer, 3 ・ 4 ・Reference numerals 5 and 6 denote a cement measuring instrument, a gravel measuring instrument, a sand measuring instrument, and a water measuring instrument disposed above the mixer 1, and 7, 8, and 9 denote the cement measuring instrument 3, the gravel measuring instrument 4, and the sand measuring instrument 5. A cement storage bin, a gravel storage bin, and a sand storage bin respectively disposed above the cement storage bin 7 are supplied with cement by a pneumatic transport means 11 from a cement silo 10 installed separately. The gravel storage bin 8 and the sand storage bin 9 are supplied with aggregated gravel / sand cooled by a known method from an aggregate storage bin 12 provided separately via a belt conveyor 13 and a turn chute 14. .

  15 and 16 are fresh water storage bins and recovered water storage bins disposed above the water meter 6, and 17 is a fresh water storage tank connected via a water supply pipe 18 to supply fresh water to the fresh water storage bin 15. A fresh water chiller 19 is connected to the fresh water storage tank 17 through a water feed pipe 20 and a reflux pipe 21 so that the fresh water is cooled to a predetermined temperature and refluxed. A known chiller 19 is used. Yes. Reference numeral 22 denotes a recovered water storage tank with a stirrer 25 connected through a water supply pipe 23 and a reflux pipe 24 to supply the recovered water storage bottle 16 with recovered water at room temperature as required, and 26 denotes the recovered water storage tank. 22, the recovered water cooling tank 29 with a stirrer 28 for transferring the recovered water at room temperature by the transfer pipe 27 to keep it cooled, and 29 and 30, a certain amount of the cooled recovered water from the recovered water cooling tank 26 A water supply pipe and a recirculation pipe 31 are supplied to a recovery water chiller 31 that circulates the recovery water in the recovery water cooling tank 26 and cools it to a predetermined temperature while the recovery water chiller 31 is ammonia as shown in FIG. A refrigerant chamber 32 enclosing a refrigerant such as carbon dioxide, a recovered water cooling pipe 33 arranged in a meandering manner in the refrigerant chamber 32, and circulating the refrigerant in the refrigerant chamber 32 outward. One cooling refrigerant for cooling pipe 34 allowed to, and the cooling chamber 35 allowed to cool the refrigerant for cooling pipe 34, and is more configuration as the cooling water circulation pipe 36 disposed in the cooling chamber 35. Reference numeral 37 denotes a cooling tower connected to the cooling water circulation pipe 36.

  Next, manufacture of the cooling concrete by the Example comprised as mentioned above is demonstrated.

First, the recovered water is sequentially transferred from the recovered water storage tank 22 to the recovered water cooling tank 26 by the transfer pipe 27, and is cooled to a predetermined temperature by the recovered water chiller 31 while the recovered recovered water is sequentially circulated. The cooling tank 26 is cooled and stored. Then, the cement is stored in the cement storage bin 7 and the gravel and sand previously cooled by a known method are stored in the gravel storage bin 8 and the sand storage bin 9 respectively, and the cooled fresh water cooled by the chiller 19 for fresh water. As a part of the kneaded water, from the fresh water storage tank 17 to the fresh water storage bottle 15, and the cooling recovered water cooled by the recovered water chiller 31 is the rest of the kneaded water (sludge solid content ratio within 3% of cement mass) Are respectively supplied from the recovered water cooling tank 26 to the recovered water storage bin 16. Next, cement and chilled gravel, sand, fresh water, and recovered water are sent to the cement meter 3 respectively.
After weighing with the gravel meter 4, sand meter 5, and water meter 6, put into the mixer 1 and knead to produce cooled concrete. At this time, since the recovered water used as a part of the kneaded water is cooled to a predetermined temperature by the recovered water chiller 31, it is possible to ensure that the cooled concrete is not adversely affected to the precooled gravel, sand and fresh water. It can be manufactured. Moreover, since the cooling and recovery water is used as a part of the kneading water, not only the industrial waste discharged from the ready-mixed concrete factory can be reduced, but also the effective use of resources can be achieved. .

  The produced cooling concrete is discharged from the mixer 1 through the concrete hopper 2 and loaded on the agitator vehicle.

  In the above embodiment, the cooling fresh water is used as a part of the kneading water and the cooling recovery water is used as the balance, but the cooling recovery water is used as the kneading water as a whole if necessary. Is also good. In addition, fresh water, gravel and sand are supposed to be cooled to a predetermined temperature in advance. However, the present invention is not limited to this. The cooling concrete may be generated by cooling only with the cooling and recovery water without cooling. Furthermore, the embodiment can be applied not only to the production of cooled concrete but also to the production of ordinary concrete as needed.

It is a schematic diagram which shows one Example of this invention. It is the schematic which shows the chiller 31 for recovered water of an Example.

1 Mixer
6 Water meter
17 Shimizu reservoir
18 water pipe
19 Chiller for Shimizu
22 recovered water storage tank
23 water pipe
24 reflux pipe 26 recovered water cooling tank
29 water pipe
30 reflux pipe 31 Chiller for recovered water

Claims (2)

A recovered water storage tank is provided to supply the recovered water to the water meter constituting the cooling concrete manufacturing apparatus, and a recovered water cooling tank is provided to supply the recovered water to the water meter. An apparatus for producing cooled concrete, wherein the recovered water cooling tank is provided with a chiller for cooling the recovered water to a predetermined temperature. 2. A fresh water storage tank is provided to supply cooling water to the water meter, and a chiller for cooling the fresh water to a predetermined temperature is attached to the fresh water storage tank. cooling concrete - DOO manufacturing apparatus.

Images