JPH0852729A - Concrete plant provided with vacuum cooling tank and exhaust device - Google Patents

Abstract

PURPOSE:To provide a concrete plant with an economical vacuum cooling tank and an exhaust unit which can store aggregate without contact with exterior at the cooled temperature as it is, and be taken out at the time of desiring to use. CONSTITUTION:Aggregate 102 is once charged in vacuum cooling tanks 111, 112, 113, 114, held in a cooled state by vacuum exhaust, and a specific quantity of the aggregate 102 is kneaded together with cement 43 and water to manufacture the concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent adverse effects on concrete due to heat of hydration generated inside concrete after placing concrete used for dam construction, embankment construction and foundation of structures. And a concrete plant equipped with a vacuum cooling tank and an exhaust device.

[0002]

2. Description of the Related Art Conventionally, concrete used for civil engineering and construction work and concrete products may have cracks after placing due to hydration heat theoretically generated after kneading.
There was a problem with long-term strength. Therefore, medium heat Portland cement, blast furnace cement, etc. were developed to reduce the heat of hydration heat accumulation in the concrete after placing, but it is theoretically impossible to remove the heat of hydration. , Embedding a cooling pipe in the cast concrete, or blowing liquid nitrogen during kneading, sometimes mixing flake ice,
Efforts have been made to remove the heat of hydration, but these conventional methods cannot sufficiently lower the temperature of the kneading concrete, and the running cost rises in proportion to the amount of concrete to be produced, which is economical It was difficult to meet.

Therefore, even if the temperature of the same kneading concrete is lowered, if the aggregates such as the fine stones and coarse stones and the sand are directly cooled, the raw material is inevitably cooled to a low temperature. Therefore, it is considered that the temperature of the kneaded concrete also changes to a temperature lower than that of the concrete manufactured by the above-mentioned conventional method. 29771
9, Japanese Patent Application No. 63-22780, or Japanese Patent Application No. 63-51
656 has been developed, and several units have already been put into practical use and are in operation.

Here, the conventional example of the conventional concrete plant will be described with reference to the schematic view of FIG.
2 is sent to the turn chute 2 by the conveyor 1. Aggregate 42 sent by conveyor 1
Is a material receiving tank 6, which is predetermined by a turn chute 2 rotated by gears 3 and 4 rotated by a motor 5.
It is thrown in 7, 8, 9 or 10. Of course, in this case
Since the type of the aggregate 42 to be put into each of the receiving tanks 6, 7, 8, 9, and 10 is determined, so that each of the receiving tanks 6, 7, 8, 9, and 10 should be full. Input and stored.

On the other hand, the cement 43 is received in the receiving tank 11 in the concrete plant by the cement silo. In this way, each receiving tank 6,7,8,
The aggregates 42 and the cement 43 that make up the concrete, which have been poured into 9, 10, and 11, are stored in preparation for weighing. Then, by operating the operator, the fan-shaped gates 12 at the bottom of the tanks are opened and closed, and the rotary valve 13 of the cement receiving tank 11 is operated, whereby the receiving tanks 6, 7, 8, 9 are received. The aggregates 42 and the cement 43 contained in the hoppers 10, 10 and 11 respectively enter the weighing hoppers 14, 15, 16, 17, 18, 19 and are respectively required by the weighing machines 20 attached to the respective hoppers. The quantity is weighed.

Further, the weighing hoppers 14, 15, 16, 1
Aggregate 42 and cement 43, which were weighed in the required amount at 7, 18, and 19, are the chute 21 under each hopper 21,
It is sequentially charged into the kneading machine 25 via 22, 23 and 24.
Thereafter, the water stored in the water tank 31 is metered by the water meter 32, and a required amount is added to the kneader 25, and the motor 26 is kneaded through the gear 27 to make concrete, and the cylinder 28 Immediately by opening the fan-shaped gate 29 by the mixer car 3
It is loaded to zero.

The operation described above with reference to FIG. 2 is a general movement of a concrete plant that has been conventionally performed. If the aggregate 42 sent by the conveyor 1 is cold water, liquid nitrogen, vacuum cooling, etc. All the tanks from the conveyor 1 to the kneader 25 are of the open type even if they are cooled by. Therefore, when such a cooling device is separately installed, although the operation is performed according to the operation schedule of the concrete plant, the timing may be shifted, and the aggregate 42 cooled at the timing is supplied to the concrete plant. Then, there is a possibility that the temperature of the cooled aggregate 42 may return to room temperature. On the other hand, while the cooled aggregate 42 is supplied to the concrete plant and the concrete plant is in operation, There is an unsolved problem that the temperature rise of the cooled aggregate 42 stocked in the concrete plant cannot be stopped even when the concrete plant is temporarily stopped due to various causes. In addition, since the cooling device is separately installed, the cooling device has to be operated independently, which also requires an operating staff, which results in an economical burden.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is a fine stone or a fine stone which is each constituent material of concrete located at the top of a conventional batcher plant. By cooling sand and sand through a vacuum cooling tank consisting of a vacuum-proof container, the aggregate can be stored at the cooled temperature without being exposed to the outside air and can be taken out when you want to use it. An object of the present invention is to provide a manufacturing method and a concrete plant with a vacuum cooling tank and an exhaust device.

[0009]

In order to achieve the above object, a concrete cooling method of the present invention, and a vacuum cooling tank and a concrete plant with an exhaust device are provided with fine stones or fine stones and sand once in a vacuum cooling tank. It is characterized in that it is put in and kept in a cooled state by vacuum evacuation, and the required amount of the above fine stones or fine stones and sand etc. are kneaded together with cement and water to produce concrete, and its concrete is equipped with a vacuum cooling tank and exhaust system The concrete plant of is configured by including a vacuum cooling tank for charging and holding fine stones or fine stones and sand, and a vacuum exhaust device for removing air and moisture in the vacuum cooling tank. The fine stones or fine stones and aggregates such as sand are taken out at a temperature in a cooled state without being exposed to the outside air, and are mixed with cement and water to give concrete. It can be produced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a concrete plant according to an embodiment of the present invention. First, conveyor 1
The moist aggregate 102 composed of fine stones or fine stones and sand carried by 01 is rotated to a predetermined position by the motor 106 via the gears 104 and 105, passes through the chute 103 that is set, and through the injection valve 107, Vacuum cooling tank 112
It is thrown into once. In FIG. 1, the vacuum cooling tank 11
The description will be made assuming that the wet aggregate 102 is put into No. 2.

When a required amount of wet aggregate 102 is put into the vacuum cooling tank 112, the conveyor 101 stops,
The closing valve 107 is closed. In this way, the vacuum cooling tank 1 can be charged into the other vacuum cooling tanks 111, 113, 114.
The same procedure as the order of loading into 12 is performed. Next, this concrete plant is equipped with a vacuum exhaust device 139 for removing air and water in the vacuum cooling tanks 111, 112, 113, 114, and is a wet aggregate such as fine stones or fine stones and sand. 102 is once a vacuum cooling tank 111, 112, 1
After being put into 13, 114, the vacuum exhaust device 139
By operating the vacuum cooling tanks 111, 112, 11
3, 114 are vacuum-evacuated, and the moisture contained in the contained aggregate 102 evaporates due to vacuum evacuation to lower the temperature of the aggregate 102, and the aggregate 102 is held at that temperature state.

If necessary, the vacuum cooling tank 111,
The outside of 112, 113, 114 can be kept cold. Since the aggregate 102 cooled in this way is shielded from the outside air unlike the open type receiving tanks 6, 7, 8, 9 of the conventional example of FIG. 2, the temperature rise due to the outside air for a long period of time. The danger of is excluded.

Therefore, the vacuum cooling tanks 111, 112, 11
3, 114 can be replaced by a concrete plant in place of the conventional receiving tanks 6, 7, 8, 9 of FIG. 2 without changing the size of the concrete plant itself or the main structure. In a word, instead of the receiving tanks 6, 7, 8 and 9, a vacuum-proof vacuum cooling tank 11 is simply used.
Vacuum pipe 13
Vacuum cooling can be achieved only by connecting 8.

The vacuum cooling tanks 111, 112, 11
Vacuum exhaust valves 108 are provided on the upper portions of 3, 114, respectively. After that, when the cooled aggregate 102 is discharged, the vacuum cooling tanks 111, 112, and
The vacuum of 113 and 114 is broken, and the lower vacuum resistant discharge valve 109
The weighing hopper 11 by opening the
The object can be achieved by dropping to 8, 119, 120, 121 and performing necessary measurement by the measuring device 124.

On the other hand, the cement 43 is received in the receiving tank 116 by the settling silo, and water is stored in the water tank 126. Next, the weighed aggregate 102
After weighing, it passes through the fan-shaped gate 125, the chute 128,
The cement 43 is fed into the kneading machine 132 via 129, 130 and 131, and the cement 43 is fed into the weighing hopper 123 via the rotary feeder 117 and is fed into the kneading machine 132 via the chute 131 by opening the damper 140. Kneader 132 from tank 126 through water meter 127
Be thrown into. Therefore, the aggregate 102 is kneaded together with the cement 43 and water by the kneading machine 132 driven by the motor 134 and the gear 133, as in the conventional example of FIG. In the figure, 135 is a fan-shaped damper for discharge, 136 is a cylinder, and 137 is a mixer truck.

[0016]

In the concrete plant of the present invention described above, the evacuation device provided is operated in conjunction with the concrete plant to produce concrete kneaded at a desired temperature. , The required amount of aggregate can be used, and even if the timing of using the aggregate is deviated due to the concrete plant for some reason, the aggregate is kept at the temperature of being cooled without touching the outside air, When you want to use it, you can take it out, knead it, and place concrete. Further, since the vacuum cooling tank is incorporated in the concrete plant, the distance to the kneading machine is short, so the probability of heating during the process is small. Therefore, by applying the present invention, high quality concrete can be poured economically.

[Brief description of drawings]

FIG. 1 is a schematic view seen from a side according to an embodiment of a concrete plant of the present invention.

FIG. 2 is a schematic view of a conventional concrete plant viewed from a side surface.

[Explanation of symbols]

 111, 112, 113, 114 Vacuum cooling tank 139 Vacuum exhaust device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Matsutani 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Kazuhiko Iida 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo In Taisei Construction Co., Ltd. (72) Inventor Zenetsu Abe 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Construction Co., Ltd. (72) Shunichi Matsumoto 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Co., Ltd. (72) Inventor Osamu Kawakami 2-25 Higashiarioka Higashiarioka, Itami City, Hyogo Prefecture Within Nichiku Kogyo Co., Ltd. (72) Inoue Sueo 2-25 Higashiarioka Higashiarioka, Hyogo Pref. In the company

Claims (2)

[Claims] 1. A pebbles or pebbles and sand are once put into a vacuum cooling tank and kept in a state of being cooled by vacuum evacuation, and a required amount of the pebbles or pebble and sand are kneaded together with cement and water for concrete. A method of manufacturing concrete for manufacturing. 2. A concrete plant with a vacuum cooling tank and an exhaust device, which comprises a vacuum cooling tank for charging and holding fine stones or fine stones and sand, and a vacuum evacuation device for removing air and moisture in the vacuum cooling tank.