JP2002067025A - Concrete manufacturing method and hopper for storing aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the amount of water required for materials based on the measured water content of a coarse aggregate, and manufacture a concrete of a uniform and high precision, and a high quality. SOLUTION: An aggregate storing section 2 has an aggregate filling port and an aggregate discharging port. A gate 3 is attached to the aggregate storing section 2, and the aggregate discharging port is made openable/closable. A water content sensor 6 is provided in the aggregate storing section 2. The water content sensor 6 has a sensor section, and the water content of the aggregate being adjacent to the sensor section can be measured. A water-sprinkling device 5 is provided above the aggregate filling port of the aggregate storing section 2. After water is sprinkled to the whole of the coarse aggregate, the water content of the coarse aggregate is measured by a water content measuring device. The amount of water required for the materials is corrected based on the measured water content of the coarse aggregate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing concrete by mixing cement, fine aggregate, coarse aggregate and water in a predetermined composition, and curing and curing the mixture. The present invention relates to an aggregate storage hopper.

[0002]

2. Description of the Related Art In order to produce concrete having predetermined strength, durability and casting workability, it is important to mix concrete. In particular, the proportion of water in the concrete material is important for the production of uniform, high-precision, high-quality concrete, in addition to ordinary concrete, especially special-mixed concrete such as high-fluidity concrete. .
Therefore, in the conventional concrete manufacturing method, the water content of the fine aggregate is measured by a water measuring device, and the corrected amount of water is added as a material based on the measured water content of the fine aggregate.

[0003]

However, in the conventional concrete manufacturing method, the water content of the coarse aggregate is not measured, and the water content of the coarse aggregate is intuitively determined according to the dry state of the coarse aggregate. I had to rely on it. The reason is that the coarse aggregate is usually dry and does not have enough moisture to be measured by a moisture measuring device. For this reason, in the conventional method for producing concrete, since the amount of water in the material does not consider the amount of water in the coarse aggregate, the quality of the produced concrete, such as slump and strength, varies, and the concrete is always kept at a high level. There was a problem that it was difficult to manufacture a quality product. In particular, concrete requiring high precision and high quality, such as high-fluidity concrete, is affected by a slight difference in the amount of water, so that it is particularly difficult to always produce high-quality concrete.

[0004] The present invention has been made in view of such conventional problems, and is capable of producing uniform, high-precision, high-quality concrete by determining the water content of coarse aggregate. It is an object of the present invention to provide a manufacturing method and an aggregate storage hopper.

[0005]

In order to achieve the above object, a method for producing concrete according to the present invention comprises mixing cement, which is a material, fine aggregate, coarse aggregate, and water in a predetermined mixture and hardening. And a method for producing concrete by curing: measuring the amount of water contained in the coarse aggregate,
It is characterized in that the amount of water of the material is an amount corrected based on the measured amount of water of the coarse aggregate.

[0006] In the concrete manufacturing method according to the present invention,
By correcting the amount of water in the material based on the measured amount of water in the coarse aggregate, the water-cement ratio can be maintained at a high precision and constant, thus producing uniform, high-precision, high-quality concrete. be able to.

In the concrete manufacturing method according to the present invention, in particular, after the coarse aggregate is impregnated with water, the amount of water in the coarse aggregate is measured, and the amount of water in the material is calculated from the calculated amount of water. It is preferable that the amount is obtained by subtracting the measured water content of the coarse aggregate.

[0008] In this case, by measuring the water content of the coarse aggregate after the coarse aggregate is impregnated with water, even when the coarse aggregate does not contain enough water to be measured by the moisture measuring device as it is, The moisture content of the coarse aggregate can be measured. In addition,
In this case, the method of including water in the coarse aggregate is watering, dipping,
Any other method may be used.

Further, the concrete manufacturing method according to the present invention is preferably arranged such that, after watering the entire coarse aggregate, the amount of water in the coarse aggregate is measured by a moisture measuring device, and the amount of water in the material is measured by a moisture correcting device. It is preferable to correct the calculated amount of water by subtracting the measured water content of the coarse aggregate from the calculated water content.

[0010] The concrete material preferably contains an admixture, and may also contain a coloring agent.

When measuring the water content of the coarse aggregate, it is preferable to measure the water content of the coarse aggregate in the vicinity of the sensor part by a water sensor. In particular, when the measurement of water is started,
It is preferable that a gas is ejected toward the sensor unit so as to remove the deposit attached to the sensor unit.

In this case, by ejecting gas toward the sensor section of the moisture sensor and removing the deposits adhering to the sensor section, it is possible to prevent a measurement error from being caused by the deposits adhering to the sensor section. it can. The gas ejected toward the sensor unit may be a gas other than air, for example, an inert gas or the like, but is preferably a gas such as dried air.

An aggregate storage hopper according to the present invention is an aggregate storage section having an aggregate input port and an aggregate discharge port; and a gate attached to the aggregate storage section so that the aggregate discharge port can be opened and closed. A moisture sensor having a sensor portion and provided inside the aggregate storage portion and capable of measuring the water content of the aggregate in proximity to the sensor portion; and above the aggregate input port of the aggregate storage portion. And a watering device provided.

The aggregate storage hopper according to the present invention stores the coarse aggregate supplied from the aggregate input port in the aggregate storage section.
Water is sprayed on the coarse aggregate inside the aggregate storage section by the water spray device. When the gate opens, the coarse aggregate inside the aggregate reservoir is
It is discharged from the aggregate outlet. At this time, the moisture sensor
The moisture of the coarse aggregate close to the sensor is measured.

[0015] The aggregate storage hopper according to the present invention is further provided inside the aggregate storage section, and is directed to the sensor section so as to remove the deposits adhering to the sensor section when the gate is opened. It is preferable to have a gas ejector for ejecting gas.

In this case, when the gate is opened and the aggregate inside the aggregate storage section is discharged from the aggregate discharge port, the gas ejector ejects gas toward the sensor section of the moisture sensor, and Eliminates deposits adhering to. Thereby, it is possible to prevent the measurement error from being caused by the deposit attached to the sensor unit.

In the aggregate storing hopper according to the present invention, it is preferable that the gas ejector has a dryer for drying the ejected gas. In this case, the dried gas can be ejected from the gas ejector toward the sensor portion of the moisture sensor. The dried gas removes deposits adhering to the sensor unit, and also dries the surface of the sensor unit to make it difficult for moisture and foreign substances to adhere to the sensor unit. Thereby, the measurement accuracy can be further improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. As shown in FIG. 1, the aggregate storage hopper 1 includes an aggregate storage unit 2, a gate 3, a watering device 4, an air cylinder 5, a moisture sensor 6, and an air ejector 7. I have. The aggregate storage part 2 has an aggregate inlet 2a at an upper part and an aggregate outlet 2b at a lower part. The side wall 2c of the aggregate storage part 2 is inclined so as to be narrowed from the aggregate inlet 2a to the aggregate outlet 2b. Gate 3
It is pivotally attached to the lower part of the aggregate storage part 2 so as to be rotatable. The gate 3 is attached to the drive unit 5a of the air cylinder 5, and the aggregate discharge port 2b can be opened and closed by expansion and contraction of the drive unit 5a.

The sprinkling device 4 is provided above the aggregate inlet 2a of the aggregate storage unit 2. The watering device 4 includes a solenoid valve 4
a. The sprinkler 4 is controlled by the solenoid valve 4a.
Water is sprayed on the coarse aggregate (gravel) inside the aggregate storage unit 2. The sprinkler 4 can also be used to clean the aggregate storage 2.

As shown in FIG. 2, the moisture sensor 6 has a probe section 6a. The probe section 6a is attached to the side wall 2c of the aggregate storage section 2 and is provided therein. As a mounting place of the probe part 6a, a place where the water content of the aggregate inside the aggregate storage part 2 is most stable and detected on average is selected. In the case of an aggregate storage hopper that frequently weighs and replenishes the material, as in a so-called batch scale, it is necessary to take into consideration the overall material movement of the aggregate storage unit 2 and to set a stagnation at the mounting location of the probe unit 6a. Choose no place.
The probe section 6a has a sensor section 6b, and the sensor section 6b
, And sends a detection signal as an electric signal to the moisture measuring device (slump controller) 8 via the cable 6c.

The moisture measuring device 8 receives the detection signal, measures moisture, and outputs moisture measurement data. Moisture sensor 6
Is not affected by contaminants, temperature, salt content, etc., and can measure the moisture content of the entire aggregate as an average value or an instantaneous value by continuous measurement. As such a moisture sensor 6, for example, a commercially available moisture sensor using microwaves can be used. The output of the moisture measurement data from the moisture measurement device 8 is output to the moisture correction device 9 (moisturized roll) of the measurement control panel.
Is input to The moisture correction device 9 corrects the aggregate setting value and the water setting value, and determines the combination.

The air ejector 7 is provided with an air supply device (not shown).
And a nozzle 7a and a dryer (not shown). The nozzle 7a shown in FIG. 2 has jet holes 7b with uniform hole sizes at regular intervals, and is connected to an air supply device. The nozzle 7a is attached to the side wall 2c of the aggregate storage part 2,
It is provided near the probe part 6 a inside the aggregate storage part 2. The nozzle 7a is connected to the sensor 6b by the ejection hole 7b.
It is arranged so that air may be blown out from the oblique direction with a uniform pressure toward the whole of the device. Due to the air ejected from the ejection holes 7b, it is possible to remove the deposits attached to the sensor section 6b. At this time, by blowing out the air at a uniform pressure, the sensor section 6b can be cleaned better.

The air supply device is provided outside the aggregate storage section 2. When the air cylinder 5 operates and the gate 3 opens, the air supply device is turned on to send air to the nozzle 7a. As the air supply device, an air supply device having a large capacity so as to increase the amount of air ejected from the nozzle 7a is used. The dryer is attached to the air supply and dries the air sent by the air supply. Thereby, the dried air can be ejected from the nozzle 7a at a high pressure.

A measuring device 10 is provided below the aggregate outlet 2b of the aggregate storage section 2. The measuring device 10 includes a measuring tank 11, a gate 12, and an air cylinder 13. The measuring tank 11 has an inlet at an upper part and an outlet at a lower part. The gate 12 is pivotally attached to the lower part of the measuring tank 11 so as to be rotatable. Gate 11 is air cylinder 1
3 is attached to the drive section 13a, and the discharge port can be opened and closed by expansion and contraction of the drive section 13a. Moisture correction device 9
The data of the aggregate setting value and the water setting value are input to the measuring device 10. The weighing device 10 performs aggregate weighing and water weighing with the value corrected by the water correction device 9.

Next, the operation will be described. The aggregate storage hopper 1 shown in FIG. 1 stores the aggregate supplied from the aggregate input port 2 a in the aggregate storage unit 2. The aggregate is for concrete production and consists of coarse aggregate (gravel) or fine aggregate (sand). Gravel stone having a diameter of 5 mm to 20 mm is used as the coarse aggregate. If the aggregate is coarse aggregate, water sprinkler 5
Thereby, water is sprinkled over the entire coarse aggregate inside the aggregate storage section 2 to make the coarse aggregate contain water. Normally, coarse aggregates delivered to a concrete manufacturing factory are delivered in any of absolutely dry, air-dry, surface-dry or wet conditions, and it is difficult to measure moisture as it is. However, by measuring the water content of the coarse aggregate after sprinkling the coarse aggregate with water and measuring the water content of the coarse aggregate, even when the coarse aggregate does not contain enough moisture to be measured by the moisture measurement device as it is, It is possible to measure the water content of the aggregate.

When the gate 3 is opened, the coarse aggregate inside the aggregate storage 2 is discharged from the aggregate outlet 2b. Gate 3
Is discharged into the measuring tank 11. Simultaneously with the opening of the gate 3, as shown in FIG. 2, the air ejector 7 ejects air (indicated by an arrow) at a high pressure toward the sensor section 6 b of the moisture sensor 6 to remove foreign matter adhering to the sensor section 6 b. Eliminate immediately. Thereby, it is possible to prevent a measurement error from being caused by a foreign substance adhering to the sensor section 6b, and to perform accurate moisture measurement. In particular, even when producing a concrete of a special composition that requires precision, the water content of the coarse aggregate can be measured with high accuracy, so that the production can be facilitated.

The air ejected from the air ejector 7 is dried by a dryer. The dried air removes deposits adhering to the sensor unit 6b and simultaneously removes the sensor unit 6b.
The surface of b is dried to make it difficult for moisture and foreign substances to adhere to the sensor section 6b. Thereby, the measurement accuracy can be further improved. As soon as the gate 3 opens, the moisture sensor 6
Measures the water content of the coarse aggregate close to the sensor section 6b in real time. The moisture measurement data measured by the moisture measurement device is input to the moisture correction device 9 of the measurement control panel.
The moisture correction device 9 corrects the amount of water of the material to an amount obtained by subtracting the measured amount of water of the coarse aggregate from the amount of water of the calculated mixture value. The measuring device 10 performs aggregate measurement and water measurement with the values corrected in real time by the moisture correction device 9. In this way, concrete can be produced by mixing cement, fine aggregate, coarse aggregate, and water, which are materials, with a predetermined composition, and curing and curing the mixture.

As described above, since the aggregate storage hopper can correct the amount of water of the material based on the measured amount of water of the coarse aggregate, the water-cement ratio can be kept constant with high accuracy. To produce uniform, high-precision, high-quality concrete. For this reason, the aggregate storage hopper is particularly suitable for producing concrete with a special composition such as high-fluidity concrete.

[0029]

According to the concrete manufacturing method and the aggregate storage hopper of the present invention, the amount of water in the material is corrected based on the measured amount of water in the coarse aggregate. Enables the production of quality concrete.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a concrete manufacturing method according to an embodiment of the present invention.

FIG. 2 is a perspective view of a moisture sensor of the hopper for storing aggregate shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aggregate storage hopper 2 Aggregate storage part 3 Gate 4 Sprinkler 5 Air cylinder 6 Moisture sensor 7 Air ejector 8 Moisture measuring device 9 Moisture corrector 10 Measuring device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiyoshi Miyagi 2-6-1-15 Iinozaka, Natori City, Miyagi Prefecture F-term in Kurihara Co., Ltd. 4G056 AA07 CA03 DA08

Claims (4)

[Claims] 1. A method for producing concrete by mixing cement, fine aggregate, coarse aggregate and water in a predetermined composition and curing and curing the mixture, wherein the amount of water contained in the coarse aggregate is determined. A method for producing concrete, characterized in that the amount of water of the measured material is adjusted to the amount corrected based on the measured amount of water of the coarse aggregate. 2. After the coarse aggregate is impregnated with water, the amount of water in the coarse aggregate is measured, and the amount of water in the material is calculated from the calculated amount of water as
2. The method for producing concrete according to claim 1, wherein the measured amount of water of the coarse aggregate is subtracted. 3. After water is sprayed on the whole coarse aggregate, the water content of the coarse aggregate is measured by a water measuring device, and the water content of the material is calculated from the calculated water amount of the mixture using a water correction device. 3. The method for producing concrete according to claim 2, wherein the measured water content of the coarse aggregate is corrected to an amount obtained by subtracting the measured water content. 4. An aggregate storage unit having an aggregate inlet and an aggregate outlet, a gate attached to the aggregate storage so that the aggregate outlet can be opened and closed, and a sensor unit, A water sensor provided inside the aggregate storage unit and capable of measuring the water content of the aggregate adjacent to the sensor unit; and a water sprinkler provided above the aggregate input port of the aggregate storage unit. A hopper for storing aggregate.