JP3143361B2 - Concrete manufacturing method and concrete manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete manufacturing method and a concrete manufacturing facility for manufacturing cooling concrete or the like for preventing thermal cracks occurring in mass concrete or hot concrete.

[0002]

2. Description of the Related Art Conventionally, temperature cracks occurring in mass concrete or hot concrete have been prevented by lowering the driving temperature as much as possible using cooling concrete. Conventionally, in the above-mentioned cooling concrete, first, an aggregate (sand or gravel, etc.) is first mixed with a refrigerant such as dry ice in a mixer to produce a cooling aggregate (when dry ice is used as the refrigerant, After the cooling aggregate is generated and the carbon dioxide gas is exhausted), water and cement are put into the mixer and kneaded together with the generated cooling aggregate to produce cooling concrete. I was That is, usually in the same mixer, the generation of the cooling aggregate and the kneading of the cooling aggregate, water and cement are continuously performed. Moreover, since the produced cooling concrete is difficult to store for a long time, the production of the cooling concrete is usually performed when the concrete is used, that is, immediately before the concrete is poured.

[0003]

When a large amount of cooling concrete is used at a time, a large amount of cooling concrete must be prepared immediately before the concrete is poured. For this purpose, for example, by increasing the size of a mixer or increasing the number of mixers, a large amount of cooling concrete is manufactured in one manufacturing process of cooling concrete, or a plurality of cooling concretes are continuously manufactured. A method is conceivable in which the process is performed to produce as much cooling concrete as possible in a short time.
However, increasing the size of the mixer causes an inconvenience because the existing mixer cannot be adopted. In addition, in order to increase the number of mixers, it is necessary to prepare another mixer in addition to the existing mixer, which is inconvenient. In addition, in one manufacturing process of the cooled concrete, in addition to the manufacturing process of the uncooled concrete (that is, the process of only kneading the uncooled aggregate, water, and cement), a process of generating the cooled aggregate is required. In addition, the time required for one process is longer than that of a concrete manufacturing process without cooling. Therefore, it is difficult to continuously perform a plurality of steps of manufacturing the cooling concrete in a short time. In view of the above circumstances, an object of the present invention is to provide a concrete manufacturing method and a concrete manufacturing facility capable of easily and conveniently preparing a large amount of cooled concrete just before concrete is poured in. .

[0004]

That is, a first aspect of the present invention is to provide a method for manufacturing a predetermined amount of aggregate (KZ) and dry ice (DA).
By combining a by lowering the temperature of the bone material (KZ) previously generated a predetermined amount of cooling aggregate the (RK), wherein
When mixing a predetermined amount of aggregate and the dry ice,
The dry ice is vaporized by endothermic sublimation.
Sucking carbon dioxide gas, and
In a form for keeping the generated cooling aggregate cool, the cooling aggregate is provided.
Is kept cool, and the produced cooling aggregate (RK) is kept cool.
Pooled, then, when using concrete, the removed cooling aggregate of a predetermined amount has been cold stored (RK) from 1 kneading quantity cooling aggregate of (RK), cooling aggregate of the first kneading quantity (RK), cement (SM), and water (M) are kneaded to produce one kneading amount of concrete (KT), and the step of producing the one kneading amount of concrete (KT) is repeated in a plurality of steps. Quantitative concrete (K
T).

[0005] The second invention of the present invention relates to an aggregate and
Mixing of dry ice and cooling bone of 1 kneading amount
The kneading of materials, cement and water should be performed by the same kneading means.
It is composed.

A third aspect of the present invention provides a cold storage means (11) having a kneading means (2) and capable of receiving and storing cold aggregate (RK) in a cold storage manner.
, A refrigerant supply means (9, 1) capable of supplying a refrigerant (DA).
0) is provided, and the kneading means (2) is provided with an aggregate supply means capable of supplying an aggregate (KZ), and the kneading means is provided between the kneading means (2) and the cold storage means (11). A first aggregate transport means (17) capable of supplying the cooled aggregate (RK) generated in (2) to the cold storage means (11) is provided, and the kneading means (2) and the cold storage means (11) are provided. ), A second aggregate transport means (19) capable of supplying the cooled aggregate (RK) stored in the cold storage means (11) to the kneading means (2) is provided. (2) is provided with a concrete supply means (7) capable of supplying concrete (KT) produced by kneading in the kneading means (2) to the outside.

According to a fourth aspect of the present invention, in the concrete manufacturing equipment (1) of the third aspect, the refrigerant supply means (9, 10) includes dry ice (DA) in the kneading means (2). Dry ice supply means (9,
10), between the kneading means (2) and the cold storage means (11), carbon dioxide gas (TS) can be sucked from the kneading means (2) and supplied to the cold storage means (11). The apparatus is provided with carbon dioxide suction and supply means (15, 16).

The numbers in parentheses are for convenience and indicate the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings. below

The same applies to the column of [Action].

[0009]

According to the first and third aspects of the present invention, a large amount of cooling aggregate (RK) is generated at any time where there is sufficient time before the concrete is poured in, thereby keeping the cooling. Just before using concrete (KT), store a large amount of cooled aggregate (R)
K) is kneaded with cement (SM) and water (M) to produce a large amount of concrete (KT).

[0010] In the first and fourth aspects of the present invention, the cold storage means (1) for cold storage of the cooled aggregate (RK).
The fact that the temperature of the cooling aggregate (RK) in the cold storage means (11) rises due to the intrusion of heat from the outside of 1), etc., indicates that the carbon dioxide gas (TS) sucked and supplied to the cold storage means (11). ) To prevent as much as possible.

[0011]

FIG. 1 is a schematic view showing an example of a concrete manufacturing facility according to the present invention.

As shown in FIG. 1, the concrete manufacturing equipment 1 has a mixer 2 which is a forced biaxial kneading mixer, and the mixer 2 is supported by a suitable support member (for example, a support leg member or the like) not shown. Mixer main body 3. A kneading space 5 formed in a form capable of storing concrete or the like is provided inside the mixer main body 3, and an input port 3 a through which aggregate KZ, cement SM, and the like can be input is provided at the upper end of the mixer main body 3. Is provided. In the kneading space 5, mixing rotors 6, 6 shown in a pair on the right and left of the paper surface in FIG. 1 are arranged so as to be able to knead the aggregate, cement, etc. of the kneading space 5. A discharge unit 7 that can be opened and closed is provided at the lower part. That is, when the discharge part 7 is opened, the cooling aggregate RK (described later) and the cooling concrete KT (described later) in the kneading space 5 are discharged downward through the discharge part 7 and the discharge part 7 is closed. The cooling aggregate RK and the cooling concrete KT in the kneading space 5 are not discharged through the discharge portion 7 and are maintained in the kneading space 5. The concrete production facility 1 has a liquefied carbonic acid storage tank (not shown) that stores liquefied carbonic acid (LCO ₂ ). The liquefied carbonic acid storage tank can take out and transport the stored liquefied carbonic acid ET. Liquefied carbonic acid supply pipes 9, 9 (two shown in FIG. 1) are connected. Of these liquefied carbonic acid supply pipes 9, 9, the side opposite to the liquefied carbonic acid storage tank is connected to the mixer main body 3 via predetermined dry ice generating horns 10, 10. That is, the liquefied carbonic acid ET taken out of the liquefied carbonic acid storage tank is transported to the mixer main body 3 side through the liquefied carbonic acid supply pipes 9, 9, and the transported liquefied carbonic acid ET passes through the dry ice producing horns 10, 10. As a result, the dry ice DA in the form of powder snow is formed, and is put into the kneading space 5. The concrete manufacturing equipment 1 includes an aggregate silo (not shown) that can store the aggregate KZ and an aggregate transport belt conveyor (not shown) that can take out the aggregate KZ of the silo and transport it to the input port 3a of the mixer 2. Etc. are provided.

Further, as shown in FIG. 1, the concrete manufacturing equipment 1 has an aggregate storage silo 11 supported by a support member (not shown).
The storage space 12 which can store the cooling aggregate RK is formed therein. In addition, a suitable heat insulating material is installed on a wall or the like of the aggregate storage silo 11 (or the wall or the like is made of a heat insulating material), so that heat exchange between the inside and outside of the storage space 12 is minimized. Preventing. In other words, aggregate storage silo 1
No. 1 can keep the cooled aggregate RK in cold storage.
At the upper end of the aggregate storage silo 11, an inlet 11a into which the cooling aggregate RK can be introduced is provided.
A discharge unit 13 that can be freely opened and closed is provided at a lower portion of 1.
That is, when the discharge unit 13 is opened, the storage space 12 is opened.
The cooling aggregate RK stored in the storage space 12 is discharged downward through the discharge unit 13, and the discharge aggregate 13 is closed, so that the cooling aggregate RK in the storage space 12 is not discharged through the discharge unit 13. , Storage space 12. An air duct 15 is provided between the mixer 2 and the aggregate storage silo 11 so as to connect the kneading space 5 and the storage space 12.
Is connected, and a predetermined blower 16 composed of a fan or the like is provided in the middle of the air supply duct 15. That is, the gas in the kneading space 5 is driven by the blower 16 to
5, and the gas sucked into the air supply duct 15 is supplied to the storage space 12.

Further, between the mixer 2 and the aggregate storage silo 11, a first conveying means 17 and a second conveying means 19 such as a belt conveyor are provided. That is, as shown in FIG. 1, for example, the first transporting means 17 is composed of a receiving-side transporting body 17a and a delivering-side transporting body 17b composed of independent belt conveyors and the like. Is disposed substantially horizontally below the discharge section 7 at a position corresponding to the discharge section 7 so as to be able to receive aggregates and the like discharged from the discharge section 7. The receiving-side carrier 17a conveys the received aggregate and the like to the right side of the paper of FIG. 1, and the delivery-side carrier 17a disposed on the right side of the receiving-side carrier 17a of FIG.
b. Delivery side carrier 17b
Are arranged in a state where the right side of the paper of FIG. 1 is raised and inclined. The delivery-side transport body 17b transports the aggregates and the like received from the reception-side transport body 17a to the upper right side of the paper of FIG. The material storage silo 11 can be charged into the charging port 11a at the upper end. In addition, the receiving-side transport body 17a can move freely in the horizontal direction of FIG. 1 which is the horizontal direction of the entirety of the receiving-side transport body 17a. Therefore, the receiving carrier 1
As described above, the receiving-side transport 17a can be arranged at a position corresponding to the discharge section 7 of the mixer 2 by moving the receiving-side transport 7a.
As shown by the two-dot chain line in FIG. On the other hand, for example, as shown in FIG. 1, the second transporting means 19 is disposed in a state where the left side of FIG. The cooling medium RK discharged from the section 13 is arranged so as to be able to receive the cooling aggregate RK, and the second transporting means 19 transfers the received cooling aggregate RK diagonally to the upper left side of the paper of FIG. It can be transported. Further, the cooling aggregate RK transported by the second transporting means 19 can be injected into the inlet 3a from the upper end side of the mixer 2. A dump truck (or an agitator car) is provided below the discharge section 7 of the mixer 2.
A vehicle stopping portion 20 is provided on which a concrete transporting vehicle 50 such as the above can stop, and the transporting vehicle 50 can freely pass between the outside of the concrete manufacturing facility 1 and the vehicle stopping portion 20. .

Since the concrete manufacturing facility 1 is configured as described above, the manufacturing of the cooled concrete KT in the concrete manufacturing facility 1 is as follows. That is, first, an aggregate KZ of one batch (that is, one batch of the mixer 2) made of sand, gravel, or the like is taken out from an aggregate silo (not shown) and transported by an aggregate transport belt conveyor or the like (not shown). Is charged into the kneading space 5 through the charging port 3a. On the other hand, liquefied carbonic acid ET is taken out from the liquefied carbonic acid storage tank (not shown) via the liquefied carbonic acid supply pipes 9, 9, and the taken out liquefied carbonic acid ET is taken out of the liquefied carbonic acid supply pipes 9, 9.
And the transported liquefied carbonic acid ET is passed through the dry ice producing horns 10 and 10 to be converted into dry ice DA in the form of powdery snow, and is introduced into the kneading space 5 (about -20). The liquefied carbonic acid ET held in a liquid state at a temperature C is solidified to become dry ice DA, thereby exhibiting a temperature state of about −80 ° C.). When the aggregate KZ and the dry ice DA are put into the kneading space 5, the aggregate KZ and the dry ice DA are mixed via the mixing rotors 6,6. By the mixing, the dry ice DA exhibiting about −80 ° C. absorbs heat and sublimates, and significantly lowers the temperature of the aggregate KZ. That is, since the dry ice DA is in a solid state, the dry ice DA is uniformly mixed into the rotating aggregate KZ via the mixing rotors 6 without floating in the kneading space 5, and the aggregate KZ is efficiently produced. Cooling can provide a sufficiently low temperature state. During the mixing of the aggregate KZ and the dry ice DA, in the kneading space 5, the carbon dioxide gas TS generated by vaporization by the endothermic sublimation of the dry ice DA is generated. In the meantime, the blower 16 is driven to suck the carbon dioxide gas TS in the kneading space 5 into the air supply duct 15, and the carbon dioxide gas TS sucked into the air supply duct 15 is collected by the aggregate storage silo 1.
One storage space 12 is supplied. Storage space 12
The inside is effectively cooled (or cooled) by the supplied carbon dioxide gas TS. The dry ice DA becomes carbon dioxide gas TS by endothermic sublimation, that is, dry ice D
Since no water is generated from A, the input amount of the dry ice DA does not affect the W / C (water-cement ratio) in the produced cooling concrete KT (described later). Is based on a concrete temperature, a cement temperature, an aggregate particle size, and the like, which are specified in advance in specifications and the like, so that the aggregate KZ is in a predetermined temperature state (for example, -10 degrees C, or a predetermined temperature such as 0 degrees C or less, for example). Temperature state).

Thus, by lowering the temperature of the aggregate KZ to a predetermined value, the aggregate KZ becomes a cooled cooled aggregate RK. That is, the cooling aggregate RK was generated. Next, by opening the discharge part 7 of the mixer 2, the cooling aggregate RK in the kneading space 5 is discharged downward through the discharge part 7. At the time of discharge, the receiving-side transport body 17 of the first transport unit 17
a is disposed at a position corresponding to the discharge section 7, and therefore, the cooled aggregate RK discharged from the discharge section 7 is received by the receiving side transport body 17a, and is transported by the receiving side transport body 17a. It is delivered to the delivery carrier 17b. Further, the cooled aggregate RK delivered to the delivery-side transport body 17b is transported by the delivery-side transport body 17b and thrown into the storage space 12 through the inlet 11a at the upper end of the aggregate storage silo 11. The supplied cooling aggregate RK is stored in the storage space 12 in a cold storage state.
Thereafter, the above-mentioned operation, that is, one batch of the aggregate KZ and the dry ice DA were put into the kneading space 5, and these were mixed to produce one batch of the cooled aggregate RK, and the produced 1
A series of operations of putting the batch of cooled aggregate RK into the storage space 12 via the first transporting means 17 and keeping it cold-stored is repeated a plurality of times, and a predetermined amount (that is, a plurality of batches of the mixer 2) is stored in the storage space 12. The cooled aggregate RK is stored. In addition,
This series of operations is performed at a time when there is enough time, such as the day before the cooling concrete KT described later is shipped.

Thereafter, for example, on the day of the injection of the cooling concrete KT, the cooling concrete KT is generated and shipped according to the following procedure. That is, by opening the discharge portion 13 of the aggregate storage silo 11, the cooled aggregate RK stored in the storage space 12 is stored for one batch (that is, one of the mixers 2) downward through the discharge portion 13. (For batch). Cooling aggregate RK discharged from discharge unit 13
Is received by the second transport means 19, and the second transport means 19
And is charged into the kneading space 5 through the charging port 3a at the upper end of the mixer 2. As described above, the carbon dioxide gas TS exists in the storage space 12, and therefore, the carbon dioxide gas TS also exists in the cooling aggregate RK in a state of being kept cool in the storage space 12. Since the carbon dioxide gas TS in the material RK is scattered in the atmosphere or the like while the cooling aggregate RK is being transported by the second transport means 19, the carbon dioxide gas TS in the cooling aggregate RK charged into the kneading space 5 is contained. Is almost nonexistent. Therefore, since the carbon dioxide gas TS is not contained in the cooling concrete KT to be described later (the cement is not neutralized), high-quality cooling concrete KT is generated. Next, the cement SM, the water M, the admixture, etc. (each for one batch) are charged into the kneading space 5 from the input port 3a, and the cooling aggregate RK, the cement SM, the water M, and the admixture charged into the kneading space 5 are added. The mixture is kneaded through the mixing rotors 6, 6 to produce one batch of cooled concrete KT. In addition, since the cement SM charged into the kneading space 5 is stored in a cement silo or the like (not shown) before the charging, the cement SM exhibits a temperature state of an external temperature or, in some cases, 40 to 50 degrees C. The water M is close to the outside air temperature, and therefore has a relatively high temperature state with respect to the concrete temperature specified by the above-mentioned specifications. However, as described above, the cooling aggregate RK having a large cooling heat is used.
However, since the cement SM and the water M and the admixture which were under relatively high temperature conditions are efficiently cooled in a short time,
Good cooled concrete KT which is sufficiently cooled is produced.

After one batch of the cooled concrete KT has been generated, the receiving-side transfer body 17a of the first transfer means 17 is disposed at a position retracted from the discharge section 7 of the mixer 2 as shown by a two-dot chain line in FIG. And the vehicle stop portion 2 below the discharge portion 7
The transport vehicle 50 is kept on standby at 0. And the discharge unit 7
Is released, and the cooled concrete KT in the kneading space 5 is discharged downward through the discharge portion 7. The discharged cooled concrete KT is loaded on the transporting vehicle 50 waiting below the discharge portion 7. After loading, the transport vehicle 50 transports and sends the cooled concrete KT to the outside of the concrete manufacturing facility 1. The above-mentioned operation, that is, the storage space 1
2, the cooling aggregate RK stored in the cold storage is discharged to the second transport means 19 by one batch to the second transport means 19.
And put into the kneading space 5 of the mixer 2, and also put the cement SM, the water M and the admixture (each one batch) into the kneading space 5, and after putting them, these cooling aggregate RK, cement SM, A series of operations of kneading the water M and the admixture to produce one batch of cooled concrete KT, loading the produced cooled concrete KT into the transport vehicle 50, and transporting and shipping the same is repeated a plurality of times, and a predetermined amount (ie, The cooling concrete KT (for a plurality of batches) is transported and shipped. A predetermined amount (that is, for a plurality of batches) of the cooled concrete KT was manufactured as described above, and was transported and shipped.

Therefore, when mass concrete or hot concrete is cast by the thus produced cold concrete KT in a low temperature state, the driving temperature can be lowered as much as possible, so that temperature cracks and the like can be prevented.

In the above-described embodiment, the aggregate supply means capable of supplying the aggregate to the kneading means such as the mixer 2 is replaced by an aggregate silo (not shown) capable of storing the aggregate and the aggregate taken out from the silo. Although an aggregate transport belt conveyor (not shown) that can be transported to the kneading means is used, the aggregate supply means may be the aggregate storage silo 11 and the second transport means 19 (that is, the aggregate transport silo 11 and the second transport means 19).
The aggregate storage silo 11 also serves as cold storage means and aggregate supply means, and the second transport means 19 also serves as second aggregate transport means and aggregate supply means. ). That is, the aggregate KZ before cooling is stored in the aggregate storage silo 11, the aggregate KZ is cooled to be a cooled aggregate RK, and then returned to the aggregate storage silo 11 for storage. Is also good.

Further, although in the above embodiment employing dry ice as a refrigerant in generating a cooling aggregate, the present invention
Among them, in the third invention, ice, liquefied nitrogen or the like can be employed as the refrigerant.

In the above-described embodiment, the air supply duct 15 is used as a carbon dioxide gas suction / supply means for sucking the carbon dioxide gas TS from the kneading means such as the mixer 2 when producing the cooling aggregate.
And a blower 16 are provided, but in the third invention of the present invention, the carbon dioxide gas T
S need not be sucked. That is, in the concrete manufacturing equipment according to the third invention, it is not always necessary to provide the carbon dioxide gas suction and supply means. When the carbon dioxide suction and supply means is not provided, a tilted mixer can be employed as the kneading means, which is convenient.

[0023]

As described above, the first aspect of the present invention relates to a method for manufacturing a predetermined amount of aggregate such as KZ and dry ice DA.
By combining a by lowering the temperature of the bone material generated in advance a quantity cooling aggregate the cooling aggregate RK etc., the
When mixing a predetermined amount of aggregate and the dry ice,
The dry ice is vaporized by endothermic sublimation.
Sucking carbon dioxide gas, and
In a form for keeping the generated cooling aggregate cool, the cooling aggregate is provided.
Is kept cool, and the produced cooling aggregate (RK) is kept cool.
The cooled aggregate thus produced is kept cool, and then, when concrete is used, one kneading amount of the cooled aggregate is taken out from the given amount of cooled aggregate that has been kept cold, and the 1 The kneading amount of the cooling aggregate, the cement such as cement SM, and the water such as water M are kneaded to produce one kneading amount of concrete such as cooling concrete KT. It is configured to repeatedly produce a predetermined amount of concrete. Therefore, in order to use a large amount of concrete such as cooling concrete at once, in order to prepare a large amount of concrete immediately before the concrete is poured,
Prior to the concrete injection, a large amount of cooling aggregate is generated and stored in a cold storage at any time where there is enough time, for example, on the day before the concrete injection day. Since the operation of generating a large amount of cooled aggregate can be performed at any time when there is enough time, the time required for the operation does not matter. Therefore, in the work of producing a large amount of cooling aggregate,
Since there is no need to increase the amount of cooling aggregate that can be produced in one batch, there is no need to increase the size of the mixer, that is, it is convenient because an existing mixer can be used. In addition, in the operation of generating a large amount of cooling aggregate, it is not necessary to increase the number of batches that can perform the operation of generating the cooling aggregate at one time.Therefore, it is not necessary to increase the number of mixers. This is convenient because there is no need to prepare a mixer. Immediately before the concrete is used, for example, on the day when the concrete is poured, a large amount of the cooled aggregate stored in the cold storage is kneaded with cement and water to produce a large amount of the concrete. At this time, as described above, the concrete production process of one kneading amount is repeated in a plurality of processes,
Because a large amount of concrete is produced, 1
It is not necessary to increase the amount of concrete that can be produced in a batch, or to increase the number of batches that can perform the concrete production work at one time, that is, it is not necessary to increase the amount of one kneading of the production of concrete. It is convenient because an existing mixer can be adopted, and it is not necessary to increase the number of mixers, and it is not necessary to prepare another mixer other than the existing mixer. Further, in the operation performed immediately before using concrete, for example, on the day of the concrete injection, the same process as that for manufacturing uncooled concrete (ie, a process consisting only of kneading aggregate, water and cement without cooling) is used. Only the step (that is, the step of producing the concrete of one kneading amount) may be repeated.
Since the time required for one step of producing the concrete of one kneading amount does not become longer than that of the step of producing concrete without cooling, it is difficult to perform the plural steps of producing the concrete of one kneading amount in a short time. Easy. Therefore, according to the present invention, a large amount of cooling concrete can be easily and conveniently prepared immediately before the concrete is poured. Also, keep the cooled aggregate cold-storage.
From outside the cold storage means such as the aggregate storage silo 11
The temperature of the cooled aggregate in the cold storage means
Ascending, the cooling capacity by the sucked carbon dioxide gas
The force can be prevented as much as possible. Therefore, cooling aggregate
Can be stored cold without raising the temperature of the
It is convenient. In addition, when performing cold storage, the cold storage
It is not necessary to separately install other cooling means etc. in the storage means etc.
In addition, cold storage during cold storage is performed when cooling aggregate is produced.
Uses carbon dioxide, the exhaust gas of
Savings or effective use

A second aspect of the present invention is directed to the concrete manufacturing method according to the first aspect, wherein the aggregate and the dry
Combine the chairs and mix the cooling aggregate and s
And water with the same mixing means.
It is something that is done.

A third aspect of the present invention is a mixer 2
A cooling storage means such as an aggregate storage silo 11 capable of receiving and storing cold aggregates such as cooling aggregates RK is provided, and a cooling medium such as dry ice DA is supplied to the kneading means. And a liquefied carbonic acid supply pipe 9 for obtaining the liquefied carbon dioxide, a cryogen producing horn 10 and the like.
An aggregate supply unit such as an aggregate silo (not shown) and an aggregate transport belt conveyor (not shown) that can supply aggregates such as Z are provided, and the aggregate is formed in the kneading unit between the kneading unit and the cold storage unit. A first aggregate transporting means such as a first transporting means 17 capable of supplying the cooled aggregate to the cold storage means is provided, and is stored in the cold storage means between the kneading means and the cold storage means. The second aggregate conveying means such as the second conveying means 19 capable of supplying the cooled aggregate to the kneading means is provided, and the kneading means is provided with a cooling concrete KT or the like produced by kneading in the kneading means. Concrete supply means such as a discharge unit 7 capable of supplying concrete to the outside is provided. Therefore, in order to use a large amount of concrete such as cooling concrete at a time, and to prepare a large amount of concrete immediately before the concrete is poured, an arbitrary time having a sufficient time before the concrete is poured is required. At the time, for example, on the day before the day of concrete injection, etc., the operation of mixing the aggregate and the refrigerant supplied from the aggregate supply means and the refrigerant supply means by the kneading means to generate a cooling aggregate is repeated, thereby producing a large amount of bone. The aggregate is produced in advance, and a large amount of the cooled aggregate is supplied to the cool storage means by the first aggregate transport means, and is stored cool by the cool storage means. Since the operation of generating a large amount of cooled aggregate can be performed at any time when there is enough time, the time required for the operation does not matter. Therefore, in the operation of producing a large amount of cooling aggregate, it is not necessary to increase the amount of cooling aggregate that can be generated in one batch, so that it is not necessary to increase the size of the mixer that is the kneading means, that is, the existing mixer can be adopted. convenient.
In addition, in the operation of generating a large amount of cooling aggregate, it is not necessary to increase the number of batches that can perform the operation of generating the cooling aggregate at one time.Therefore, it is not necessary to increase the number of mixers. This is convenient because there is no need to prepare a mixer. Immediately before using concrete, for example, on the day of the concrete pouring, etc., a large amount of cooled aggregate that has been kept cold is stored via the second aggregate transport means.
The kneading amount of the cooled aggregate is taken out and supplied to the kneading means, where the one kneading amount of the cooling aggregate and the cement S are mixed.
By kneading M and water M, one kneading amount of concrete such as cooling concrete KT is produced. The process of producing the concrete of one kneading amount is repeated a plurality of steps,
Try to produce a lot of concrete. Therefore, 1
Since it is not necessary to increase the amount of concrete that can be produced in a batch or to increase the number of batches that can perform the concrete production operation at one time, that is, it is not necessary to increase one kneading amount of the concrete production, the mixer that is a kneading means is enlarged. There is no need to use an existing mixer, there is no need to increase the number of mixers, and there is no need to prepare another mixer other than the existing mixer, which is convenient. Further, in the operation performed immediately before using concrete, for example, on the day of the concrete injection, the same process as that for manufacturing uncooled concrete (ie, a process consisting only of kneading aggregate, water and cement without cooling) is used. Process (ie,
Only the step of producing the concrete of one kneading amount) may be repeated. Since the time required for one step of producing the concrete of one kneading amount does not become longer than that of the step of producing concrete without cooling, it is difficult to perform the plural steps of producing the concrete of one kneading amount in a short time. Easy. Therefore, according to the present invention, a large amount of cooling concrete can be easily and conveniently prepared immediately before the concrete is poured.

A fourth aspect of the present invention is the concrete manufacturing equipment according to the third aspect, wherein the refrigerant supply means comprises a liquefied carbon dioxide supply pipe 9 capable of supplying dry ice such as dry ice DA to the kneading means. And a dry ice supply unit such as a dry ice generating horn 10, which can supply a carbon dioxide gas such as carbon dioxide gas TS from the kneading unit to the cold storage unit between the kneading unit and the cold storage unit. Since it is configured by providing carbon dioxide suction and supply means such as the air supply duct 15 and the blower 16, when mixing the aggregate and the dry ice by the kneading means, the carbon dioxide formed by vaporization by endothermic sublimation of the dry ice is absorbed. The gas is sucked from the kneading means by the carbon dioxide gas sucking and feeding means and supplied to the cold storage means. In the cold storage means, when the cold aggregate is kept cold, the cooled aggregate is kept cold by the supplied carbon dioxide gas. Therefore, it is possible to prevent the temperature of the cooling aggregate in the cold storage means from increasing due to the invasion of heat from the outside of the cold storage means by the cooling ability by the supplied carbon dioxide gas as much as possible. Therefore, in addition to the effect of the third aspect, the cooled aggregate can be stored in a refrigerator without raising the temperature of the aggregate as much as possible. Further, at the time of cold storage, it is not necessary to separately install another cooling means or the like in the cold storage means or the like, and further, the cold storage at the time of cold storage is an exhaust gas when cooling aggregate is generated. Since carbon dioxide is used, energy saving or effective use is realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a concrete production facility according to the present invention.

[Explanation of symbols]

1 concrete manufacturing equipment 2 kneading means (mixer) 7 concrete supply means (discharge part) 9 refrigerant supply means, dry ice supply means (liquefied carbon dioxide supply pipe) 10 refrigerant supply means, dry ice Supply means (dry ice producing horn) 11 Cold storage means (aggregate storage silo) 15 Carbon dioxide suction supply means (air supply duct) 16 Carbon dioxide suction supply means (blower) 17 First bone Material transport means (first transport means) 19 ... second aggregate transport means (second transport means) DA ... dry ice, refrigerant (dry ice) KT ... concrete (cooled concrete) KZ ... aggregate M ... … Water RK …… Cooling aggregate SM …… Cement TS …… Carbon dioxide

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-246010 (JP, A) JP-A-2-292003 (JP, A) JP-A-6-297446 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B28C 5/46 B28C 9/02

Claims (4)

(57) [Claims] 1. A predetermined amount of aggregateDry iceMixing
By lowering the temperature of the aggregate, a predetermined amount of
Pre-generated cooling aggregate,The predetermined amount of aggregate and the dough;
When mixing rye ice, the dry ice absorbs
Suction of carbon dioxide produced by heat sublimation
And The cooled aggregate produced by the sucked carbon dioxide
In the form of keeping cold, the cold aggregate is stored cold,  Then, when using concrete, keep the cold storage
The cooling aggregate of one kneading amount was removed from the predetermined amount of cooling aggregate
And mix the cooling aggregate of one kneading amount, cement and water.
Kneading produces 1 kneading amount of concrete
The step of producing the concrete of one kneading amount is repeated.
Repeat several steps to produce a certain amount of concrete
The method for producing concrete thus constructed. 2. A method of mixing said aggregate and dry ice,
The kneading of the cooling aggregate of one kneading amount, cement and water is the same.
Claims characterized in that it is performed by one kneading means
Item 7. A method for producing concrete according to Item 1. 3. A kneading means, comprising: a cold storage means for receiving and storing the cooled aggregate; and a cooling supply means for supplying a cooling medium to the kneading means; Providing aggregate supply means capable of supplying, between the kneading means and the cold storage means, providing a first aggregate transport means capable of supplying the cold aggregate generated in the kneading means to the cold storage means, Between the kneading means and the cold storage means, there is provided a second aggregate transport means capable of supplying the cooling aggregate stored in the cold storage means to the kneading means, wherein the kneading means comprises: Concrete production equipment which is provided with concrete supply means capable of supplying concrete produced by kneading in the outside. 4. The cooling medium supply means is a dry ice supply means capable of supplying dry ice to the kneading means, wherein carbon dioxide gas is sucked from the kneading means between the kneading means and the cold storage means. The concrete manufacturing equipment according to claim 3, further comprising a carbon dioxide gas suction supply means capable of supplying the cold storage means.