JP2022070540A - Ready mixed concrete production method - Google Patents

Abstract

To produce ready mixed concrete as ordered extremely without performing useless trial kneading.SOLUTION: The production of ready mixed concrete is performed at least in two times, per time, compared with slump and slum flow values, appropriateness is determined, in the time following to the time in which nonconformity is present, the regulation of the increase/decrease of an admixture amount in consideration of the former time is performed, thereafter, a ratio between a cement amount and a unit water amount in the ready mixed concrete after kneading is obtained to obtain estimated intensity, compared with the intensity to be required, the regulation of the increase/decrease of water amount is performed, and the ready mixed concrete produced in several times is mixed in the same agitator car.EFFECT: Since trial kneading is not performed, ready mixed concrete in all times is not wasted, and by increasing the number of divisions, the production of the total amount is performed while performing fine regulation, thus ready mixed concrete of high quality as ordered can be produced.SELECTED DRAWING: Figure 2

Description

The present invention relates to a technique for shipping ready-mixed concrete as ordered.

The biggest request of the orderer of ready-mixed concrete is that it is manufactured according to the order of the orderer (with material composition), especially in the actual post-casting concrete after shipment of ready-mixed concrete as follows. It must meet the requirements of at least one of the two conditions.
(1) The manufactured ready-mixed concrete meets the specified strength and durability when it reaches the specified age, and it is guaranteed.
(2) The freshness of the manufactured ready-mixed concrete when it is transported to a predetermined location by an agitator truck ensures workability that makes it easy to place.

Mainly regarding the concrete strength and durability after hardening in (1) above, the applicant does not have a predetermined age based on the actual results of the ready-mixed concrete factory based on the amount of water and cement contained in the produced ready-mixed concrete. A method that can guarantee strength and durability immediately after kneading, that is, it suppresses the risk of nonconformity after shipment from the ready-mixed concrete manufacturing plant, and stabilizes high-quality ready-mixed concrete as ordered. The method of shipping the concrete is proposed in Patent Document 1 (Japanese Patent No. 5718886).

That is, the method proposed in Patent Document 1 is a dynamic load of cement, aggregate, water corrected based on the surface water content of aggregate, and an admixture, which are blended based on an order when producing ready-mixed concrete. , These are kneaded, the unit water amount of ready-mixed concrete after kneading is measured, the ratio of the cement amount and the unit water amount is obtained from the measured values, the estimated strength is obtained, and the minimum and maximum values of this estimated strength are obtained. The range of the value is obtained, and whether or not it is less than the recommended value of the unit water amount, whether or not the ratio of the cement amount and the unit water amount is not more than a predetermined ratio, and the lowest of the lowest and highest values of the estimated strength. Shipment is judged only when all the conditions of whether the value is the required strength and the probability of occurrence of the minimum value of the estimated strength is 95% or more are satisfied, and the ready-mixed concrete suitable for shipping is cut out. It is to give instructions.

Further, mainly regarding the workability and workability of the ready-mixed concrete described in (2) above, the applicant in Patent Document 2 (Japanese Unexamined Patent Publication No. 2020-71134) describes the composition, blending and kneading device of the ready-mixed concrete. We proposed a method to measure fluidity by excluding disturbance factors such as the load of concrete and to calculate highly reliable slump and slump flow estimates.

That is, in the method proposed in Patent Document 2, in order to estimate the slump and slump flow values of ready-made concrete, they are arranged so that the upper and lower surfaces are open and the upper surface is a large diameter and the lower surface is a small diameter. The ready-made concrete after kneading and before shipping is charged into the measuring container, the discharge time and the discharge rate of the ready-made concrete discharged from the measuring container are measured, and the ready-made concrete is deposited from the upper surface of the measuring container. It is the average shear strain of multiple peripheral parts in the central predetermined diameter part of the top surface, the average shear strain of multiple peripheral parts in the larger diameter part than the central predetermined diameter part, and the maximum value of the discharge volume within the discharge time of ready-mixed concrete. The maximum volume fluctuation amount is continuously measured and calculated within the discharge time, and the estimated value of slump and slump flow is calculated based on these.

By using the methods of Patent Documents 1 and 2, the quality of ready-mixed concrete is dramatically improved as compared with the past, and the above requirements (1) and (2) are satisfied and guaranteed, respectively. However, it is still not 100% to meet the ordered (1) strength and durability, and (2) workability requirements, and the quality of ready-mixed concrete to be shipped still varies at the casting site. The current situation is that it is occurring.

Also, in order to meet the request of the ordering party, it is conceivable to repeat so-called trial kneading many times, especially by adjusting water and admixture, but ready-mixed concrete that is incompatible with trial kneading cannot be shipped, so it is discarded. There was no choice but to do so, and there was a loss of equipment utilization rate and time for materials and trial kneading.

Japanese Patent No. 5718886 Japanese Unexamined Patent Publication No. 2020-71134

The problems to be solved by the present invention are not 100% for the ordered (1) strength and durability, (2) workability requirements, and the quality of ready-mixed concrete to be shipped is still high. There are variations at the casting site, and when trial kneading is performed to improve the quality of ready-mixed concrete to be shipped, the materials for the trial kneading, equipment utilization rate, and time are lost.

In order to solve the above-mentioned problems, in the present invention, the ready-mixed concrete is manufactured in at least two times, and the divided amount obtained by dividing all the concrete materials by the number of times of production is calculated, and each time is based on the divided amount. The dynamic load of each concrete material is measured, and then these are kneaded. For the kneaded ready-mixed concrete, estimated slump and slump flow values are calculated and mixed with the required slump and slump flow values. Adjust the necessity of the agent and the amount if necessary, then determine the estimated strength of ready-mixed concrete and determine whether this estimated strength is an appropriate value, and consider the previous time in the next time when there was a nonconformity. It was decided to mix the ready-mixed concrete produced multiple times in the same agitator car by adjusting the increase / decrease in the amount of water.

Basically, ready-mixed concrete is manufactured so that it has the ordered (estimated) strength, slump and slump flow value, but it contains errors due to weather, time zone, and various other factors. From a certain level, the estimated strength does not approach the required strength. Therefore, according to the present invention, even if the production amount (order) of ready-mixed concrete is small, it is divided into at least two times. After manufacturing so that it is always in order, in the second time (final time), the amount of water in the second time is corrected in consideration of the error in the first time, so even if the same error as in the first time occurs in the second time. Although the error as a whole is reduced and it is divided into at least two times, it is not a trial kneading, so the ready-mixed concrete is not wasted in all the times, and the whole amount is manufactured while making fine adjustments by increasing the number of divisions. Therefore, it is possible to manufacture high-quality ready-mixed concrete as ordered.

It is a figure which shows the schematic structure of the ready-mixed concrete manufacturing equipment of this invention. It is a figure which shows the ready-mixed concrete manufacturing procedure of this invention. It is a figure which shows the estimation procedure of a slump and a slump flow value. It is a figure which shows the procedure of the calculation of the estimated intensity and the necessity of moisture. In the procedure for estimating the slump and the slump flow value, (a) is a diagram showing the relationship between the flow velocity at the time of discharging the ready-mixed concrete and the discharging time, and (b) is a figure showing the relationship between the maximum flow velocity at the time of discharging the ready-mixed concrete and the slump. be. It is a figure which shows the relationship between the measuring container and a TOF camera in the lamp and the slump flow value estimation equipment. In the procedure for estimating the slump and slump flow values, (a) is a diagram showing the relationship between the average shear strain value when the slump value is 10 cm and the discharge time, and (b) is the average shear strain value when the slump value is 15 cm. It is a figure which shows the relationship of discharge time. In the procedure for estimating the slump and slump flow values, (a) is a diagram showing the relationship between the average shear strain and the discharge time when the slump value is 21 cm, and (b) is the maximum average shear strain and the slump when the ready-mixed concrete is discharged. It is a figure which shows the relationship of. In the procedure for estimating the slump and the slump flow value, (a) is a diagram showing the relationship between the volume fluctuation amount of the ready-mixed concrete and the discharge time, and (b) is a diagram showing the relationship between the maximum volume fluctuation amount of the ready-mixed concrete and the slump. It is a figure which shows the relationship between each factor and a slump in the slump and the slump flow value estimation procedure.

The present invention aims to satisfy and guarantee at least one of (1) strength and durability and (2) workability of the ordered ready-mixed concrete, and for this purpose, the ready-mixed concrete is manufactured at least twice. Each time, the dynamic load of each concrete material is measured based on the divided amount, and then these are kneaded and kneaded. For the later ready-mixed concrete, the estimated values of slump and slump flow are calculated, and the necessity of admixture and the amount when necessary are adjusted by comparing with the required slump and slump flow values, and then the ready-mixed concrete. The estimated strength of the concrete is determined and whether or not this estimated strength is an appropriate value. Achieved by mixing in an agitator car.

Further, the present invention has the above object to perform the production of ready-mixed concrete in at least two times, calculate the division amount obtained by dividing all the concrete materials by the number of times of production, and each time, concrete based on the division amount. The dynamic load of each of the materials was measured, these were kneaded, and for the kneaded ready-mixed concrete, the estimated values of slump and slump flow were calculated and compared with the required slump and slump flow values, and there was a nonconformity. In the next round, the amount of admixture will be adjusted in consideration of the previous round, and then the estimated strength of the ready-mixed concrete after kneading will be calculated and the water content will be increased or decreased in comparison with the required strength. It can also be achieved by mixing the ready-mixed concrete produced in the same agitator car.

Further, in the present invention, both of the above-mentioned purposes (1) and (2) are performed by dividing the ready-mixed concrete into at least two times, and the division amount is calculated by dividing all the concrete materials by the number of times of production, and each time. In addition, the dynamic load of each concrete material is measured based on the split amount, these are kneaded, and it is confirmed whether it is the final time among the manufacturing times, and if it is not the final time, the judgment regarding the slump and the slump flow value is suitable. In the case of, and if the judgment regarding the estimated strength is conforming, the agitator truck is instructed to cut out as it is, and if the judgment regarding the slump and the slump flow value is conforming and the judgment regarding the estimated strength is not conforming, the excess and deficiency water content Is calculated and fed back to instruct the agitator truck to cut out, and if the judgment regarding the slump and slump flow values is not suitable, the excess or deficiency amount of the admixture is calculated and fed back, and if the judgment regarding the estimated strength is suitable. Instructs the agitator truck to cut out as it is, and if the judgment regarding the slump and slump flow value is non-conforming, the excess or deficiency amount of the admixture is calculated and fed back. The amount of water is calculated and fed back to instruct the agitator truck to cut out, and if it is the final round, the increase / decrease is adjusted in consideration of the amount of excess / deficiency admixture fed up to the previous time, and the feedback is given up to the previous time. This can be achieved by adjusting the increase / decrease in consideration of the excess and deficiency water content, cutting out into the same agitator truck as described above, and mixing the ready-mixed concrete manufactured multiple times in the same agitator truck.

Further, in the present invention, for the implementation of the above-mentioned manufacturing method, the ordered cement, aggregate, surface water content of aggregate, water corrected based on the surface water content of aggregate, and admixture are measured, respectively. A measurement unit and a management unit that performs various calculations and judgments based on these measurement units and controls the whole are provided, and an input unit for instructing the blending amount of the ordered ready-mixed concrete to the management unit and this input unit An instruction section that instructs the addition of cement and aggregate in the blending ratio entered in the section, and a measuring container that is a hollow facet cone with open upper and lower surfaces and is arranged so that the upper surface has a large diameter and the lower surface has a small diameter. And, it is equipped with a TOF (Time of Flight) camera placed diagonally above the top opening of this measuring container, and further, even if it is a small amount, the production of ready-mixed concrete is divided into at least two times, and the current production time is the final time. In addition to determining whether or not, (1) the estimated strength of ready-mixed concrete after kneading is determined, and whether or not this estimated strength is an appropriate value is determined. Adjust the increase / decrease. (2) Calculate the estimated value of slump and slump flow of ready-mixed concrete after kneading, compare it with the requested slump and slump flow value, and consider the previous time in the next time of nonconformity. This can be realized by a ready-mixed concrete manufacturing facility equipped with a control unit that performs at least (1) of adjusting the increase / decrease in the amount of admixture.

Hereinafter, examples of the present invention will be described with reference to the drawings. The method of the present invention is carried out, for example, in the ready-mixed concrete manufacturing equipment of the present invention shown in FIG. The ready-mixed concrete manufacturing facility 1 (hereinafter referred to as “equipment 1”) of the present invention is a facility for lightweight and cutting, kneading, checking, and shipping (discharging to an agitator truck) of ready-mixed concrete material, for example, a small amount of production. Even if it is manufactured in multiple parts (twice in this example), the water content is adjusted at the next manufacturing time, which is divided in consideration of the final estimated intensity value, slump and slump flow value of the first time. , The configuration is as follows in order to adjust the amount of admixture.

2 is a cement cut-out part, 3 is an aggregate cut-out part, 4 is a water supply part, 5 is an admixture cut-out part, and 2 is a cement cut-out part 2, an aggregate cut-out part 3, and an admixture cut-out part 5. Each of the cement dynamic load measurement unit 2A, the aggregate dynamic load measurement unit 3A, the surface water content measurement unit 3B, the hydraulic load measurement unit 4A, and the admixture dynamic load measurement unit 5A, which measure the mass of each material, are respectively. It is provided.

Reference numeral 6 denotes a kneading device for kneading each material supplied from the cement cutting section 2, the aggregate cutting section 3, the water supply section 4, and the admixture cutting section 5, and the kneading device 6 is used for kneading. A time measuring unit 6A for measuring the time and a kneading number measuring unit 6B for measuring the number of kneading times are provided.

Reference numeral 7 denotes a wet batch hopper that cuts out ready-mixed concrete supplied from the kneading device 6, and the wet batch hopper 7 is provided with a unit water amount measuring unit 7A and a shipping amount measuring unit 7B.

Reference numeral 8 is a hollow truncated cone with open upper and lower surfaces between the discharge port of the kneading device 6 and the charging opening of the wet batch hopper 7, so that the upper surface has a large diameter and the lower surface has a small diameter. It is a measuring container. The measuring container 8 has a shape as shown in FIG. 2 in which the slump cone used for the slump test is inverted, and the upper surface is open and the lower surface is provided with an open gate for opening / closing control.

Reference numeral 9 is a TOF camera (Time of Flight Camera) arranged diagonally above the opening on the upper surface of the measuring container 8. The TOF camera 9 is arranged diagonally above the upper surface opening of the measuring container 8. The TOF camera 9 outputs an image pickup (measurement data) signal to a control unit 12 described later, and is controlled by the control unit 12 by a control signal for starting / stopping measurement.

In the case of this embodiment, the measuring container 8 and the TOF camera 9 are provided between the kneading device 6 and the wet batch hopper 7. The TOF camera 9 is housed in a protective container in order to protect it from cement particles and flying mortar and perform continuous measurement. This protective container is waterproof, dustproof, and moistureproof, and also has a function of dissipating heat generated from a semiconductor laser.

The above is the equipment installed outdoors in the equipment 1, and the measurement signal by each measurement unit of the outdoor equipment and the operation instruction signal of each unit are input to the management unit 11 provided as the indoor equipment and output from the management unit 11. It is configured to be. The connection relationship between indoor equipment and outdoor equipment will be described later.

Of the equipment 1, the management unit 11 provided indoors is composed of, for example, a server having a configuration equivalent to that of a (personal) computer, and the CPU and memory provided in the server are the control unit 12, the hard disk is the data unit 13, and the keyboard and mouse are. The input unit 14 and the display (or printer) are the output units 15.

The ready-mixed concrete manufacturing method of the present invention is a part of a series of operation programs such as manufacturing, management, kneading, and determination of shipping availability in equipment 1. In the equipment 1, the control unit 12 reads out the entire program corresponding to the ready-mixed concrete manufacturing method from the data unit 12 in the management unit 11 to the control unit 12, and by activating the so-called program, the following calculation unit 12A and compounding instruction unit 12B , The determination unit 12C is expressed. The control unit 12 performs various operations based on various input data and data for mathematical formulas and inquiries read from the data unit 13, and controls each unit of the outdoor equipment.

That is, the control unit 12 performs various operations based on the outputs from the measurement units 2A, 3A, 3B, 4A, 5A, 6A, 6B, 7A, 7B and the TOF camera 9, and the result to the determination unit 12C. The calculation unit 12A outputs the compounding instruction signal to the cement cutting unit 2, the aggregate cutting unit 3, the water supply unit 4, and the admixture cutting unit 5, and the calculation unit 12A. It mainly has a determination unit 12C for determining the suitability of the calculated value based on each calculated calculated value.

Further, the control unit 12 controls the opening of the opening gate on the lower surface of the measuring container 8 (the same applies when the wet batch hopper 7 also serves). The control unit 12 always opens according to a certain rule so that the opening speed of the opening gate does not affect the calculation of the estimated value of the slump and the slump flow later.

Then, the control unit 12 in the present embodiment divides the production of ready-mixed concrete into at least two times even if it is a small amount, and calculates the divided amount by dividing the ordered cement and aggregate compounding amount by the number of times of production. , Based on each value measured by each measuring unit, the ratio of the cement amount and the unit water amount is obtained, the estimated strength is obtained, and whether or not this estimated strength is an appropriate value is determined, and the number of times of nonconformity occurs. Next time, the amount of water will be increased or decreased in consideration of the previous time, and the estimated value of slump and slump flow will be calculated based on the value measured by imaging within the discharge time with the TOF camera, and the requested slump and slump flow value will be calculated. In the next time when there is a nonconformity, the suitability is judged, and the amount of admixture is adjusted in consideration of the previous time.

Hereinafter, the processing of the control unit 12 will be described. FIG. 2 is a flowchart showing the entire processing procedure of the method of the present invention in the present embodiment. The management unit 11 executes a program for controlling the entire equipment 1, and each unit on the outdoor side inputs the requested order from the input unit 14 under the operating status (procedure 1: hereinafter referred to as # 1).

Subsequently, the control unit 12 determines the number of divisions (twice in this embodiment) based on the order (# 2), and the divided amount of the material is divided into the cement cutting portion 2, the aggregate cutting portion 3, and the water. It is cut out from the supply part 4 and the admixture cutting part 5 (# 3).

In # 3, in this embodiment, the corrected water amount is obtained based not only on the order but also on the surface water content of the aggregate. The corrected water volume is determined as follows. The control unit 12 measures the coarse grain ratio of the aggregate, measures the actual rate of the coarse aggregate of the aggregate, and then measures the surface water content of the aggregate by the surface water ratio measuring unit 3B. Then, based on the conditions input from the input unit 14 regarding the current formulation in the production of the ordered ready-mixed concrete, the quality data of the aggregate is inquired to the data unit 13, and an arithmetic formula for obtaining the estimated strength is specified. The standard deviation is set.

In addition, when the material is actually cut out in # 3, the determined blending amount and conditions of the cement, aggregate, water, and admixture to be blended by the input section 14 are transmitted to the output section 15 (described here as a display). It is output, and the compounding amount, conditions, and the like are output by the output unit 15.

When the control unit 12 outputs the cutout execution signal by # 3, the cement is sent to the cement dynamic load measuring unit 2A, the aggregate is sent to the aggregate dynamic load measuring unit 3A, and the water (including the above correction) is sent to the hydraulic load measuring unit 4A. The admixture is cut out into the admixture dynamic load measuring unit 5A.

Prior to cutting out the material into each dynamic load measuring unit 2A, 3A, 4A, 5A and performing dynamic load measurement (# 4), in this embodiment, the measurement accuracy of each measuring unit 2A, 3A, 4A, 5A. This accuracy value is output to the control unit 12, and the control unit 12 measures the dynamic load in consideration of the measurement error.

After measuring the dynamic load of each material in # 4, the control unit 12 calculates the cement water ratio (cement amount / water amount: ratio of the amount of cement to the amount of water) using the dynamic load values of cement and water. , The strength before kneading is calculated using the dynamic load value of each material, and this value is temporarily stored in the data unit 13. The strength referred to in the present invention is a general term for compressive strength and bending strength, and each material is charged into the kneading device 6 and kneading is started by the kneading device 6 (# 5).

The control unit 12 controls the number of kneading times and the kneading time from the kneading device 6, outputs the situation to the output unit 15, and monitors and outputs the situation. In the case of the example, the ready-mixed concrete after kneading is discharged from the kneading measure 6 to the measuring container 8.

After # 5, the control unit 12 estimates the slump and slump flow values described in detail later in the measuring container 8 (# 6: subroutine), and confirms whether or not this is the final number of times divided by # 2. (# 7).

If it is not the last in # 7 (No in # 7), the control unit 12 determines whether the slump and slump flow values estimated in # 6 are appropriate (within the range) (# 8), and if they are appropriate. (OK with # 8), the ready-mixed concrete is discharged from the measuring container 8 to the wet batch hopper 7.

On the other hand, when # 8 is not appropriate (NG in # 8), the control unit 12 uses the excess / deficiency amount of the admixture as the next (final in this embodiment) admixture cutout amount (necessary in # 3). The data is fed back to the data unit 13 for information (# 10), and the ready-made concrete is discharged from the measuring container 8 to the wet batch hopper 7 as in the case where the processing itself is appropriate.

In the wet batch hopper 7, the control unit 12 calculates the estimated strength based on the amount of water and the amount of cement described in detail later (# 9), and confirms whether or not this is the final number of times divided by # 2. (# 11).

If # 11 is not the last (No in # 11), the control unit 12 determines whether the intensity value estimated in # 9, that is, the water content is appropriate (within the range) (# 12), and is appropriate. If there is (# 12 is OK), it is discharged from the wet batch hopper 7 to the agitator truck (# 13), and the round ends.

On the other hand, when # 12 is not appropriate (NG in # 12), the control unit 12 uses the excess or deficiency of the water content as the next (final in this embodiment) water supply amount (with the necessary information in # 3). The data is fed back to the data unit 13 (# 14), and the process itself is discharged from the wet batch hopper 7 to the agitator vehicle (# 13) as in the case where the processing itself is appropriate, and the process ends.

Further, in # 7, if the round is the final round divided (Yes in # 7), the admixture amount is adjusted here in consideration of the excess / deficiency amount of the admixture up to the previous time (# 15). The treatment proceeds to # 9, while in # 11, if that time is the final divided round (Yes in # 11), the water content is adjusted here in consideration of the excess or deficiency of water up to the previous time. (# 16), the process proceeds to # 13.

The above is the outline of the ready-mixed concrete manufacturing method of the present invention using the equipment 1 of the present invention. Here, the merit of manufacturing by dividing one order will be described. For example, when one order is manufactured at one time, for example, a value close to the upper limit or adjustment of the upper and lower range of the slump and slump flow value, and for example, a value close to the upper limit or adjustment of the upper and lower range of the (estimated) intensity value. Can be.

In the present invention, the upper limit or the lower limit of the upper and lower range of the slump and slump flow value and the (estimated) intensity value in the case of manufacturing one order at one time is still unacceptable, and the upper limit is obtained by manufacturing a plurality of times. Or, when the admixture and water content that cause the value swinging near the lower limit are divided and manufactured, by adjusting each time in consideration of the previous amount, fine adjustment is repeated every time the number of times is repeated, and the upper and lower range is adjusted. It has the advantage of being able to approach the median.

Then, in order to ensure the above-mentioned merit of manufacturing by dividing one order, it is important to calculate the estimated value of the slump and the slump flow value in # 6 and the estimated strength of the ready-mixed concrete in # 9. Will be.

(Estimation of slump and slump flow value)
Hereinafter, the subroutine processing of # 6 and # 9 will be described. FIG. 3 shows a subroutine that calculates the slump and slump flow values of # 6 in FIG. In the previous step, that is, in this embodiment, after receiving the ready-mixed concrete discharged from the kneading device 6 (described later) with the open gate on the lower surface of the measuring container 8 closed, the control unit 12 is constant to stand still. Time is counted (Procedure 1: Hereinafter referred to as S1).

The control unit 12 receives all the ready-mixed concrete discharged from the previous process in the measuring container 8, and after a certain period of time, opens the open gate provided on the lower surface of the measuring container 8 to discharge the ready-mixed concrete from the measuring container 8. (S2). This open gate is designed so that the opening method does not affect the estimation of the slump and the slump flow value.

The control unit 12 operates the TOF camera 9 at the same time or immediately before the opening gate on the lower surface of the measuring container 8 is opened (S3). The TOF camera 9 continuously photographs the top surface of the ready-mixed concrete deposit in the measuring container 8 from above the measuring container 8 while discharging the ready-made concrete pile from the measuring container 8, and the distance from the imaging data to the imaging point. Is measured and output to the control unit 12.

In S3, the control unit 12 continuously calculates the following items based on the data from the TOF camera 9, and uses these as the measured values.
・ Flow velocity, average shear strain, and volume fluctuation during discharge of ready-mixed concrete

(Flow velocity when discharging ready-mixed concrete)
The control unit 12 calculates the discharge rate based on the amount of discharge inside the measuring container 8 after a predetermined time has elapsed, that is, the amount of sedimentation associated with the discharge from the top surface of the deposit.

That is, the ready-mixed concrete discharge amount ΔV (t) after t seconds is the following formula obtained by subtracting the ready-mixed concrete volume V (t) up to t seconds from the ready-mixed concrete volume V (t-1) measured at t-1 seconds. Can be calculated as a volume.
ΔVt = V (t-1) -V (t) (cm ³ ) (1)

The flow velocity Δvt at the time of discharging the ready-mixed concrete from t-1 second to t second is the area A (cm ² ) of the discharge opening, which is the amount of ready-mixed concrete discharged from t-1 second to t second obtained by the above equation (1). It can be calculated by the following formula divided by the measurement time interval Δt. FIG. 5A shows the relationship between the flow velocity and the discharge time when discharging ready-mixed concrete.
Δvt = ΔVt / (A × Δt) (cm / S) (2)

(Average shear strain)
The control unit 12 calculates the amount of depression (settlement amount) at a specific point as the average shear strain amount from the image pickup data of the top surface of the ready-mixed concrete pile in the measurement container 8 by the TOF camera 9. As shown in FIG. 6, the top surface of the ready-mixed concrete discharged into the measuring container 8 has a concave central portion due to the shape of the measuring container 8 and its own weight at the time of discharging the ready-mixed concrete, and the outer peripheral portion gradually sinks. Therefore, the height of the top surface of the deposit in the measuring container 8 is lowered, which is a characteristic of the deposit deformation.

This characteristic is influenced by the viscosity of ready-mixed concrete, and it appears prominently depending on the degree of viscosity. Therefore, in the present invention, instead of estimating the slump and slump flow values based on the factors indirectly affected by the fluidity, the focus is on the amount of shear strain in the measuring container 8, that is, the fluidity of the ready-made concrete itself. We decided to focus on (that is, directly) to estimate the slump and slump flow values.

For this shear strain, the average value was adopted because the viscosity of ready-mixed concrete tends to be inhomogeneous depending on the deposition position even after kneading. In order to obtain the average shear strain, as shown in FIG. 6, the heights of a plurality of points on the top surface of the deposited concrete in the measuring container 8 of the flowing ready-mixed concrete are measured and averaged.

The explanation will be continued with reference to FIG. The TOF camera 9 has five points including, for example, the center of a predetermined central diameter region (hereinafter referred to as region I) in the measuring container 8, and further, a region having a large diameter from the central predetermined diameter of the concentric circles (hereinafter referred to as region II). For example, at four points, the vertical height Li (t) (i is the measurement position, i = 1 to 9) at each point at a predetermined interval timing when the ready-mixed concrete is discharged from the lower surface of the measurement container 8 is measured. And send it to the control unit 12. The relationship between the shear strain and the discharge time during the discharge of ready-mixed concrete is shown in FIGS. 7 to 8.

The amount of fluctuation ΔLi (t) in the vertical direction of each point is the vertical height Li (t) of each measurement point t seconds after the vertical height Li (t-1) of each measurement point at t-1 second. ) Is subtracted from the following formula.
ΔLi (t) = Li (t-1) -Li (t) (cm) (3)

The shear strain amount Δγi (t) after t seconds at each measurement point in the region I is the radius (X cm) of the region I with the fluctuation amount ΔLi (t) of the vertical displacement after t seconds at the measurement position i (2 to 5). Calculated by the following formula divided by.
Δγ2 (t) = {ΔL1 (t) -ΔL2 (t)} / X (4-1)
Δγ3 (t) = {ΔL1 (t) -ΔL3 (t)} / X (4-2)
Δγ4 (t) = {ΔL1 (t) -ΔL4 (t)} / X (4-3)
Δγ5 (t) = {ΔL1 (t) -ΔL5 (t)} / X (4-4)

For the shear strain amount Δγi (t) after t seconds at each measurement point in region II, the fluctuation amount ΔLi (t) of the vertical displacement after t seconds at the measurement position i (6 to 9) is the radius (X ′) of region II. Calculated by the following formula divided by cm).
Δγ6 (t) = {ΔL2 (t) -ΔL6 (t)} / X'(5-1)
Δγ7 (t) = {ΔL3 (t) -ΔL7 (t)} / X'(5-2)
Δγ8 (t) = {ΔL4 (t) -ΔL8 (t)} / X'(5-3)
Δγ9 (t) = {ΔL5 (t) -ΔL9 (t)} / X'(5-4)

The average shear strain amount Δν of the region I and the region II is calculated by Equation 1 for averaging the shear strain amounts calculated at four points orthogonal to each other on the circumference.

(Volume fluctuation amount)
Even if the capacity is the same, the discharge time differs depending on the viscosity, and the discharge time is shorter when the viscosity is smaller than when the viscosity is higher. The discharge time T is 0 from the value when the ready-made concrete deposit in the measuring container 8 shows the maximum value from the imaging of the TOF camera 9 and the distance determination, that is, the volume is 0 or the volume fluctuation amount. Is calculated as the cumulative time up to the time n when becomes 0. FIG. 9 shows the relationship between the volume fluctuation amount of ready-mixed concrete and the discharge time.

As described above, the flow velocity of ready-mixed concrete (Fig. 5), average shear strain and discharge time (Figs. 7 to 8), volume fluctuation amount and (Fig. 9) are shown in FIGS. 5 (b) and 8 (b), respectively. , As shown in FIG. 9B, it has a simple characteristic related to the viscosity (slump) of ready-mixed concrete, and is provided as a model formula in the data unit 13.

That is, in the method for estimating the slump and slump flow values of the present invention, the peak of the flow velocity in the relationship between the flow velocity and the discharge time of the ready-mixed concrete shown in FIG. Maximum flow velocity), the peak of the average shear strain (maximum average shear strain) in the relationship between the average shear strain and discharge time of ready-made concrete in regions I and II shown in FIG. 8 (b), and shown in FIG. 9 (b). The data unit 13 is provided with a database recording each relationship between the peak (maximum volume fluctuation amount) of the ready-mixed concrete fluctuation amount in the relationship between the volume fluctuation amount of the ready-made concrete and the discharge time.

As shown in FIG. 5A, the relationship between the flow velocity at the time of discharging ready-mixed concrete and the slump and slump flow values accelerates with the discharge time, reaches the maximum (peak), and then rapidly decelerates. This relationship is based on the relational expression (approximate straight line) as shown in FIG. 5B depending on the viscosity of the ready-mixed concrete, although the peak flow velocity and the discharge time to reach the peak differ depending on the viscosity of the ready-mixed concrete. The control unit 12 reads the relational expression of FIG. 5 (b) from the data unit 13 and collates it (S4).

The relationship between the average shear strain of ready-mixed concrete and the slump and slump flow values is as shown in FIGS. 7 (a) (b) and 8 (a). Although the discharge time to reach the maximum shear strain is different, the control unit 12 is based on the relational expression (approximate straight line) as shown in FIG. 8 (b) depending on the viscosity of the ready-mixed concrete. ) Is read from the data unit 13 and collated (S4).

As shown in FIG. 9A, the relationship between the volume fluctuation and the discharge time is that when the maximum volume fluctuation amount (peak) is the same volume but the viscosity is different, the discharge time to reach this peak is different and the viscosity of the ready-mixed concrete Since the smaller the value is, the more the relational expression of FIG. 9B is based on the relational expression (approximate straight line) as shown in FIG. 9B, the control unit 12 reads the relational expression of FIG. 9B from the data unit 13 and collates it (S4). ).

The control unit 12 obtains from the data unit 13 the maximum flow velocity value which is the peak of the flow velocity of the ready-mixed concrete, the maximum average shear strain value which is the peak of the average shear strain in the regions I and II, and the ready-mixed concrete. The slump and slump flow estimates for each factor are specified based on the maximum volume fluctuation value, which is the peak value of the volume fluctuation, and the slump and slump flow estimates specified for each factor are specified as shown in FIG. The center of the upper limit value and the lower limit value in the range in which all of the above are contained is calculated, and this is used as the estimated value of the slump and the slump flow obtained from the measurement result (S5).

After that, as described above, the control unit 12 tells the data unit 13 the flow velocity of the ready-mixed concrete (FIG. 5), the average shear strain and the discharge time (FIGS. 7 to 8), the volume fluctuation amount, and (FIG. 9), respectively. The relationship between the slump and the slump flow is fed back to the "measured value" as shown in FIGS. 5 (b), 8 (b), and 9 (b), and the estimated value of S5 and the ready-mixed concrete are extracted. It is verified with the measured value of the slump test that has been carried out (S6).

In the data section 13, the reverse of the above, for example, the flow velocity, average shear strain and discharge time, and volume fluctuation amount of ready-mixed concrete when the slump (fixed) value and slump flow (fixed) value actually obtained in the slump test are used. It has "actual test" related data as shown in each of FIGS. 5 (b), 8 (b), and 9 (b), and reaches the estimated values of slump and slump flow calculated in S5. , Verifying that the above "measured values" do not deviate beyond the permissible range from the relational expressions of each "actual test" with respect to the flow velocity, average shear strain and discharge time, and volume fluctuation of ready-mixed concrete, in S5. Determine the validity of the estimate.

For example, since the estimated value of S5 is obtained by calculating the center of the upper limit value and the lower limit value in the range in which all the slump and slump flow estimated values specified by each factor are contained, one or more elements may be, for example. The estimated value of S5 will be calculated even if it deviates significantly from the relational expression of the "actual test". In order to prevent such problems, the flow velocity, average shear strain and discharge time, and volume fluctuation of ready-mixed concrete obtained in advance by fixing the slump and slump flow values actually obtained in the slump test for each element. After performing comparative verification with each element of the amount, the necessity of the admixture and the amount of the admixture, if necessary, are determined and added.

Returning to FIG. 2, when the time is not the last (No in # 7) and the deviation exceeds the permissible range for each element (NG in # 8), the control unit 12 is miscible with respect to the permissible range. The agent is added and the excess or deficiency amount of the admixture for the dissociation exceeding the allowable range is fed back (# 10), and the process proceeds to # 9.

On the other hand, the control unit 12 does not deviate beyond the permissible range for each element, that is, if the time is not the last (No in # 7), that is, if it is an appropriate value (OK in # 8), the permissible range. The admixture for is added, and the process proceeds to # 9.

Further, when the time is the last (Yes in # 7), the control unit 12 adjusts the amount of the admixture to be added this time (if necessary) and the amount of excess or deficiency of the admixture up to the previous time. Processing proceeds to # 9.

As described above, instead of the slump test and slump flow test, which were conventionally performed by extracting ready-mixed concrete after kneading, the estimated values of slump and slump flow, which were calculated based on various related factors, are related to ready-mixed concrete. Since the flow characteristics of the concrete itself are observed and measured, and calculated based on this, what are the disturbance factors such as quality fluctuations of the materials used for ready-mixed concrete, compounding factors of ready-mixed concrete, and electrical factors of kneading equipment? However, there was almost no discrepancy between the obtained estimated value and the measured value of the slump test and the slump flow test, and a highly reliable estimated value was obtained. You can figure out how much you need, if you need it.

(Estimation of strength)
Next, the subroutine processing in # 9 of FIG. 2 will be described with reference to FIG. After completing the calculation of the necessity of the admixture based on whether or not the slump and the slump flow value are within the allowable range in FIG. 2, the amount thereof when necessary, and the calculation of the excess / deficiency amount, that is, from the measuring container 8. When the ready-mixed concrete is discharged to the wet batch hopper 7 (S11), the unit water amount of the ready-mixed concrete is measured by the unit water amount measuring unit 7A (S12).

In S12, the unit water amount / cement amount is calculated based on the unit water amount obtained in # 3 of FIG. 2 and the dynamic load value of the cement measured in # 4 of FIG. 2, and this value is stored in the data unit 13. .. Further, the control unit 12 calculates the estimated intensity based on the unit water amount (S14).

Then, the various measured values before kneading obtained in # 4 of FIG. 2 and the estimated strength value after kneading in S14 are read out from the data unit 13, and the control unit 12 determines the allowable strength (S15). .. In the determination in the determination unit 12C, the following conditions are determined.

In S15, whether the upper limit of the unit water amount is 195 kg / m ³ or less, whether the ratio of the unit water amount / cement amount is less than 60% or less than 65% depending on the type of cement, and the minimum estimated strength value. Among the regions of the value and the maximum value, it is determined whether or not the minimum value satisfies the required intensity and whether or not the occurrence probability of the minimum value is 95% or more. The reasons for setting the numerical values in each of these shipping suitability conditions will be described later.

In the determination of S15, if even one is not satisfied (No in S15), the control unit 12 calculates the excess / deficiency amount of the water content according to the determination condition that does not meet the condition (S16), and if all of them are satisfied (in S15). Appropriate), the process proceeds to # 11 in FIG.

Here, the above conditions will be described. Generally, concrete used in reinforced concrete structures has a cover thickness of 3 cm for the reinforcing bars, and the allowable amount of 185 kg / m ³ ± 10 kg to ensure that the reinforcing bars do not rust for an assumed period of 60 years or more with this cover thickness. It is recommended to use a unit water volume of / m ³ . Therefore, if the unit water content is higher than 195 kg / m ³ , it exceeds the plus side of the 185 kg / m ³ permissible amount ± 10 kg / m ³ guaranteed by regulation. In this case, the water content is high. That will be more.

In addition, since the durability of cement may not be measured by the unit water amount (water amount) alone, the ratio of unit water amount / cement amount is used as a judgment of suitability for shipping. Even if the ratio of unit water amount / cement amount is higher than 60% or 65% depending on the type of cement, it means that the ratio of water to cement is large, so there is a possibility that the above-mentioned rust prevention guarantee of 60 years or more will not be satisfied. Yes, it is judged that the water content needs to be adjusted.

Further, among the regions of the minimum and maximum values of the estimated strength values, whether or not the minimum value satisfies the required strength is determined by the strength region calculated mainly on the unit water amount after kneading (S14: calculated value after kneading). Even when the lowest value is lower than the ordered desired strength (# 1 in FIG. 2), that is, the required strength, it is determined that the water content needs to be adjusted.

Further, even when the lowest value in the strength region (S14: calculated value after kneading) calculated centering on the unit water amount after the kneading is higher than the required strength, the probability of occurrence of the lowest value is lower than 95%. In this case, it is determined that the water content needs to be adjusted, assuming that there is no guarantee that the minimum value higher than the required intensity can be generated.

As described above, it is strict considering that there is an error between the required strength based on the order (# 1 in FIG. 2) and the calculated value immediately before shipment (S14: calculated value after kneading) as described above. Since it is determined that the moisture adjustment is not necessary only when all the conditions are satisfied, it is possible to remarkably suppress the occurrence of troubles in terms of strength and durability after shipment.

Returning to FIG. 2, the control unit 12 determines the excess or deficiency of water when the time is not the last (No in # 11) and the water content adjustment based on the incompatibility of the estimated intensity is required (NG in # 12). Feedback is given (# 14), and the process proceeds to # 13.

On the other hand, the control unit 12 proceeds to the process if the time is not the last (No in # 11) and the incompatibility of the estimated intensities does not occur, that is, if it is an appropriate value (OK in # 12).

If the control unit 12 is the last time (Yes in # 11), the control unit 12 adjusts the water content by that amount if there is a water content adjustment amount up to the previous time, and the process proceeds to # 9.

In # 13, the ready-mixed concrete of all the production times divided into a plurality of parts is discharged to the same agitator truck. That is, in the present invention, there is no so-called trial kneading, which is a test kneading that is not suitable for shipping (even if it is suitable) and is discarded. For example, even if the amount of admixture and the amount of water are insufficient in the first time, the amount of admixture and the amount of water that are insufficient in the first time are added to the second time (final in this example) (final). This is because the amount is increased for each batch), the second batch is manufactured, and the mixture is mixed until it arrives at the casting site with the same agitator truck.

By making it as in the present invention, as a simple calculation, the more the number of manufactures is divided, the more the whole amount is manufactured while repeating fine adjustments, so that the overall error becomes smaller, and as a result, the quality is as close as possible to the order. You will be able to ship ready-mixed concrete.

1 (Prepared concrete manufacturing) equipment 2 Cement cutting part 2A Cement dynamic load measuring part 3 Aggregate cutting part 3A Aggregate dynamic load measuring part 3B Surface water rate measuring part 4 Water supply part 4A Hydraulic load measuring part 5 Admixture Cutout part 5A Admixture dynamic load measurement part 6 Kneading device 7 Wet batch hopper 7A Unit water amount measurement part 11 Management part 12 Control part 12A Calculation part 12B Mixing instruction part 12C Judgment part 13 Data part 14 Input part 15 Output part

In order to solve the above problems, the present invention performs the production of ready-mixed concrete in at least two times, calculates the division amount by dividing all the concrete materials by the number of times of production, and each time, each of the concrete materials. After measuring the dynamic load of the concrete, the concrete material after the dynamic load measurement is kneaded, and for the ready-mixed concrete after kneading, the estimated values of slump and slump flow are discharged from the measurement container of the ready-mixed concrete after kneading and before shipping. Time, discharge rate, average shear strain at the time of discharging at multiple peripheral edges of the central predetermined diameter of the measuring container, average shear strain at the time of discharging at multiple peripheral edges larger than the central predetermined diameter, and ready-mixed concrete. Calculated based on the maximum volume fluctuation, which is the maximum value of the discharged volume within the discharge time, and compared with the required slump and slump flow values, the necessity of an admixture for the ready-mixed concrete after this kneading. After adjusting the amount if necessary , the unit water amount of ready-mixed concrete after kneading is measured, and the estimated strength of ready-mixed concrete is obtained from the ratio of the cement amount and the unit water amount in the measured values and this estimation. It is judged whether the strength is an appropriate value, and when it hits the next time when the estimated strength is incompatible, the increase or decrease of the water content with respect to the estimated strength of the ready-mixed concrete after the previous kneading is adjusted. It was decided to mix the ready-mixed concrete produced in multiple times in the same agitator car.

The present invention aims to satisfy and guarantee at least one of (1) strength and durability and (2) workability of the ordered ready-mixed concrete, and for this purpose, the ready-mixed concrete is manufactured at least twice. The division amount is calculated by dividing all the concrete materials by the number of times of manufacture, and each dynamic load of the concrete material is measured, and then the concrete material after the dynamic load measurement is kneaded. For ready- mixed concrete after kneading , the estimated values of slump and slump flow are calculated. Calculated based on the average shear strain of the concrete, the average shear strain at the time of discharging multiple peripheral edges larger than the central predetermined diameter, and the maximum volume fluctuation, which is the maximum value of the discharged volume within the discharging time of ready-mixed concrete. Compared with the required slump and slump flow values, the necessity of admixture and the amount of admixture if necessary were adjusted for the ready-mixed concrete after kneading, and then the ready-mixed concrete after kneading was adjusted. The unit water amount is measured, the estimated strength of ready-mixed concrete is obtained from the ratio of the cement amount and the unit water amount among the measured values, and it is judged whether or not this estimated strength is an appropriate value. When it hits the next time, the water content is adjusted for the estimated strength of the ready-mixed concrete after the previous kneading for the ready-mixed concrete after the current kneading, and the ready-mixed concrete manufactured multiple times is mixed in the same agitator car. Achieved by doing.

Further, in the present invention, the above-mentioned object is performed by dividing the ready-mixed concrete into at least two times, and the division amount obtained by dividing all the concrete materials by the number of times of production is calculated, and each movement of the concrete material is calculated for each time. Measure the load, knead the concrete material after dynamic load measurement , and for the ready-mixed concrete after kneading , estimate the slump and slump flow. The average shear strain at the time of discharging multiple peripheral edges of the central predetermined diameter of the measuring container, the average shear strain at the time of discharging multiple peripheral edges larger than the central predetermined diameter, and the discharge time of ready-mixed concrete. Calculated based on the maximum volume fluctuation amount, which is the maximum value of the discharged volume in the concrete, and compared with the requested slump and slump flow values . The amount of admixture was adjusted for the slump and slump flow estimate of the ready-mixed concrete after kneading for the ready-mixed concrete after this kneading , and then the unit water amount of the ready-mixed concrete after kneading was measured. Of the above measured values, the estimated strength of ready-mixed concrete was obtained from the ratio of the amount of cement to the amount of unit water, and compared with the required strength, the water content of the ready-mixed concrete after this kneading was adjusted to increase or decrease the water content. It can also be achieved by mixing the ready-mixed concrete produced in one round in the same agitator car.

Further, in the present invention, both of the above-mentioned purposes (1) and (2) are performed by dividing the ready-mixed concrete into at least two times, and the division amount is calculated by dividing all the concrete materials by the number of times of production, and each time. In addition, the dynamic load of each concrete material is measured , the concrete material after the dynamic load measurement is kneaded, it is confirmed whether it is the final round of the manufacturing times, and if it is not the final round, the judgment regarding the slump and the slump flow estimated value is made. If is conforming, and if the judgment regarding the estimated strength is conforming, the agitator car is instructed to cut out as it is, and the discharge time and discharge rate from the ready-mixed concrete measuring container after kneading and before shipping, and the center of the measuring container. The average shear strain when discharging multiple peripheral edges of a predetermined diameter, the average shear strain when discharging multiple peripheral edges larger than the central predetermined diameter, and the maximum value of the discharged volume within the discharge time of ready-mixed concrete. If the judgment regarding the slump and slump flow estimated value calculated based on a certain maximum volume fluctuation is suitable, and the unit water amount of ready-mixed concrete after kneading is measured, the cement amount and the unit water amount of the measured values are measured. If the judgment regarding the estimated strength obtained from the ratio is non-conforming, the excess / deficiency water content is calculated , this calculated value is stored , the agitator vehicle is instructed to cut out, and the judgment regarding the slump and slump flow estimated values is non-conforming. Calculates the excess or deficiency amount of the admixture , stores this calculated value, and if the judgment regarding the estimated strength is suitable, instructs the agitator car to cut out as it is, and the judgment regarding the slump and slump flow estimated value is not suitable. In that case, the excess / deficiency amount of the admixture is calculated and the calculated value is stored . If it is the final time, the increase / decrease adjustment based on the calculated value memorized for the excess / deficiency amount of the admixture up to the previous time is performed on the ready-mixed concrete after this kneading, and the water content up to the previous time is also instructed. The increase / decrease adjustment based on the calculated value memorized for the excess / deficiency amount is performed on the ready-mixed concrete after this kneading , and it is cut out in the same agitator car as above, and the ready-mixed concrete manufactured multiple times is put in the same agitator car. It can be achieved by mixing.

Further, in the present invention, regarding the implementation of the above-mentioned manufacturing method, a measuring unit for measuring the dynamic load of each of concrete, aggregate, water and admixture and the surface water content of the aggregate cut out based on the order. And, a management unit that performs various calculations and judgments based on the measured values of these measurement units and controls the whole is provided, and an input unit for instructing the blending amount of the ordered ready-mixed concrete to the management unit and this Measurements arranged so that the upper surface is a large diameter and the lower surface is a small diameter, with a hollow faceted conical shape with open upper and lower surfaces, and an instruction unit that instructs the input of concrete and aggregate in the blending ratio input in the input unit. It is equipped with a container and a TOF (Time of Flight) camera placed diagonally above the top opening of this measuring container. Furthermore, even if the amount of ready-mixed concrete is small, it is divided into at least two times, and the current production time is the final. In addition to determining whether or not, (1) the unit water amount of ready-mixed concrete after kneading is measured, and the estimated strength of ready-mixed concrete is obtained from the ratio of the cement amount and the unit water amount in the measured values, and this estimated strength is It is judged whether it is an appropriate value, and when it hits the next time when the estimated strength is incompatible, the increase / decrease adjustment of the water content based on the excess / deficiency water content with respect to the estimated strength of the ready-mixed concrete after the previous kneading is adjusted this time. (2) Estimated values of slump and slump flow of ready-mixed concrete after kneading are calculated for the ready-mixed concrete after kneading and before shipment. The average shear strain at the time of discharging a plurality of peripheral edges of the central predetermined diameter portion of the measuring container, the average shear strain at the time of discharging a plurality of peripheral edges larger than the central predetermined diameter portion, and the discharge within the discharge time of ready-mixed concrete. Calculated based on the maximum volume fluctuation, which is the maximum value of the volume , compared with the requested slump and slump flow values, and when the next time there is a nonconformity with the estimated values of the slump and slump flow, the previous mixture At least (1) is performed for the ready-mixed concrete after squeezing this time, adjusting the increase / decrease in the amount of the admixture based on the excess / deficiency admixture amount with respect to the estimated value of the slump and slump flow of the ready-mixed concrete after smelting. This can be achieved by a ready-mixed concrete manufacturing facility equipped with a control unit.

Further, in the present invention, both of the above-mentioned purposes (1) and (2) are performed by dividing the ready-mixed concrete into at least two times, and the division amount is calculated by dividing all the concrete materials by the number of times of production, and each time. In addition, the dynamic load of each concrete material is measured, the concrete material after the dynamic load measurement is kneaded, and it is confirmed whether it is the final round of the number of productions. In the case of conformity, and if the judgment regarding the estimated strength is conforming, the agitator vehicle is instructed to cut out as it is, and the discharge time and discharge rate of the ready-mixed concrete after kneading and before shipment from the measuring container and the central predetermined value of the measuring container. It is the average shear strain when discharging multiple peripheral edges of the diameter, the average shear strain when discharging multiple peripheral edges larger than the central predetermined diameter, and the maximum value of the discharged volume within the discharge time of ready-mixed concrete. If the judgment regarding the slump and slump flow estimated value calculated based on the maximum volume fluctuation is suitable, and the unit water amount of ready-mixed concrete after kneading is measured, the ratio of the cement amount to the unit water amount in the measured values. If the judgment regarding the estimated strength obtained from is non-conforming, the excess / deficiency water content is calculated, this calculated value is stored, the agitator vehicle is instructed to cut out, and if the judgment regarding the slump and slump flow estimated values is non-conforming. , Calculate the excess / deficiency amount of the admixture, store this calculated value, and if the judgment regarding the estimated strength is suitable, instruct the agitator car to cut out as it is, and if the judgment regarding the slump and slump flow estimated value is not suitable. Calculates the excess / deficiency amount of the admixture, stores this calculated value, and if the judgment regarding the estimated strength is incompatible, calculates the excess / deficiency water content, stores this calculated value, and instructs the agitator vehicle to cut out. If it is the final round, the amount of admixture will be increased or decreased based on the calculated value memorized for the excess or deficiency of the admixture up to the previous time. The increase / decrease in the amount of water based on the calculated value memorized for the excess / deficiency of water was adjusted for the ready-mixed concrete after this kneading, and it was cut into the same agitator car as above and manufactured multiple times. This can be achieved by mixing concrete in the same agitator car.

Further, the present invention relates to a measuring unit that measures the dynamic load of each of concrete, aggregate, water, and admixture and the surface water content of the aggregate, which are cut out based on the order, for the implementation of the above-mentioned manufacturing method. , A management unit that performs various calculations and judgments based on the measured values of these measurement units and controls the whole is provided, and an input unit for instructing the blending amount of the ordered ready-mixed concrete to the management unit and this input unit. A measuring container arranged so that the upper surface is a large diameter and the lower surface is a small diameter, with a hollow faceted conical shape with open upper and lower surfaces, and an instruction unit that instructs the addition of concrete and aggregate in the blending ratio entered in the unit. And, it is equipped with a TOF (Time of Flight) camera placed diagonally above the top opening of this measuring container, and further, even if it is a small amount, the production of ready-mixed concrete is divided into at least two times, and the current production time is the final time. In addition to judging whether or not, (1) the unit water amount of ready-mixed concrete after kneading is measured, and the estimated strength of ready-mixed concrete is obtained from the ratio of the cement amount and the unit water amount among the measured values, and this estimated strength is appropriate. Whether it is a value or not is judged, and when it hits the next time when the estimated strength is incompatible, the increase / decrease adjustment of the water content based on the excess / deficiency water content with respect to the estimated strength of the ready-mixed concrete after the previous kneading is adjusted this time. (2) Estimated values of slump and slump flow of ready-mixed concrete after smelting are calculated for the ready-mixed concrete after kneading and before shipment. Average shear strain when discharging multiple peripheral edges of the central predetermined diameter of the measuring container, average shear strain when discharging multiple peripheral edges larger than the central predetermined diameter, and discharge volume within the discharge time of ready-mixed concrete. Calculated based on the maximum volume fluctuation amount, which is the maximum value of, and compared with the requested slump and slump flow values. Control to perform both or (1) to adjust the increase / decrease in the amount of admixture based on the excess / deficiency admixture amount with respect to the estimated value of the slump and slump flow of the ready-mixed concrete after this time. This can be achieved by a ready-mixed concrete manufacturing facility equipped with a part.

Claims (4)

The ready-mixed concrete is manufactured in at least two times, the division amount is calculated by dividing all the concrete materials by the number of times of production, and each time, the dynamic load of each concrete material is measured based on the division amount. After that, these are kneaded, and for the kneaded ready-mixed concrete, the estimated value of slump and slump flow is calculated, and the necessity of the admixture and the amount when necessary are adjusted by comparing with the requested slump and slump flow value. Then, the estimated strength of ready-mixed concrete is obtained, and whether or not this estimated strength is an appropriate value is determined. A ready-mixed concrete manufacturing method in which ready-mixed concrete manufactured in the same manner is mixed in the same agitator vehicle. The ready-mixed concrete is manufactured in at least two times, the division amount is calculated by dividing all the concrete materials by the number of times of production, and each time, the dynamic load of each concrete material is measured based on the division amount. These are kneaded, and for the ready-mixed concrete after kneading, the estimated value of slump and slump flow is calculated, compared with the requested slump and slump flow value, and the next time when there is a nonconformity, the admixture considering the previous time. The same agitator car is used for the ready-mixed concrete manufactured multiple times by adjusting the amount of ready-mixed concrete and then adjusting the increase / decrease of water content by comparing the estimated strength of the ready-mixed concrete after kneading with the required strength. A method for producing ready-mixed concrete to be mixed in. The ready-mixed concrete is manufactured in at least two times, the division amount is calculated by dividing all the concrete materials by the number of production times, and each time, the dynamic load of each concrete material is measured based on the division amount. Knead these, check if it is the last of the production times,
If it is not the last round,
If the judgment regarding the slump and slump flow value is conforming, and if the judgment regarding the estimated strength is conforming, the agitator truck is instructed to cut out as it is.
If the judgment regarding the slump and slump flow value is conforming and the judgment regarding the estimated strength is not conforming, the excess and deficiency water content is calculated and fed back to give an instruction to cut out to the agitator truck.
If the judgment regarding the slump and slump flow value is not suitable, the excess or deficiency amount of the admixture is calculated and fed back, and if the judgment regarding the estimated strength is suitable, the agitator truck is instructed to cut out as it is.
If the judgment regarding the slump and slump flow value is non-conforming, the excess / deficiency amount of the admixture is calculated and fed back, and if the judgment regarding the estimated strength is non-conforming, the excess / deficiency water content is calculated and fed back to the agitator truck. Give instructions to cut out,
If it is the last round
Adjust the increase / decrease in consideration of the amount of excess / deficiency admixture fed back up to the previous time, adjust the increase / decrease in consideration of the amount of excess / deficiency water fed back up to the previous time, and cut out into the same agitator truck as above.
A ready-mixed concrete manufacturing method in which ready-mixed concrete manufactured multiple times is mixed in the same agitator truck. A measuring unit that measures the ordered cement, aggregate, surface water content of the aggregate, water corrected based on the surface water content of the aggregate, and admixture, and various calculations and judgments based on these measurement units. It is equipped with a management unit that controls the whole as well as performing, and the input unit for instructing the blending amount of the ordered ready-mixed concrete and the cement and aggregate of the blending ratio input in this input section are input to the management unit. A pointing part to be instructed, a measuring container arranged so that the upper and lower surfaces have a large diameter and a small diameter on the lower surface, and a TOF arranged diagonally above the upper surface opening of the measuring container. (Time of Flight) Equipped with a camera
moreover,
Even if the amount of ready-mixed concrete is small, it is divided into at least two times to determine whether the current production is the final or not.
(1) Obtain the estimated strength of ready-mixed concrete after kneading, determine whether or not this estimated strength is an appropriate value, and adjust the water content in consideration of the previous time at the next time when there is a nonconformity.
(2) Estimated values of slump and slump flow of ready-mixed concrete after kneading are calculated and compared with the required slump and slump flow values. Make adjustments,
A ready-mixed concrete manufacturing facility equipped with a control unit that performs at least (1).

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