JP7267056B2 - CSG material quality measurement and control method and quality measurement and control system - Google Patents

Description

The present invention relates to a quality measurement and control method and a quality measurement and control system for CSG materials, and more particularly, to measure the fluctuation tendency of particle size and water content of granular materials used in the CSG (Cemented Sand and Gravel) method. It relates to a method and system for properly managing

In recent years, techniques for constructing dam bodies, coastal embankments, etc. using the CSG construction method have become widespread. The CSG construction method is a construction method for constructing dam bodies, etc., using a mixture of locally generated materials such as sand and gravel, cement, and water. , cost reduction can be achieved. Since the CSG method uses locally generated materials, it is necessary to appropriately grasp the fluctuation tendency of the particle size and moisture content of the material during CSG production, and various techniques have been proposed (for example, Patent Document 1, Patent Document 2).

The technology described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-105898/Patent No. 6173894) relates to a method for managing the surface water content of ground materials in real time. In this ground material surface water content control method, the water content for each predetermined particle size of the ground material mixed with various particle sizes continuously supplied to the construction site is obtained and stored in advance. In addition, the water content of the entire grain size range of the ground material to be supplied is continuously measured, a part of the ground material to be supplied is sampled at predetermined intervals to detect the grain size distribution, and the grain size distribution of the ground material is detected. and the moisture content of particles equal to or larger than the predetermined particle size among the stored moisture contents by particle size. Then, the surface water content of the ground material is estimated in real time based on the stored water content of a predetermined particle size or more and the calculated water content of a predetermined particle size or less.

The technique described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2015-10952/Patent No. 6243640) relates to a system for measuring the particle size distribution of CSG materials. This particle size distribution measurement system includes a material flow section that causes material to flow down, an imaging section that photographs the flowing material, and a calculation section that calculates the particle size distribution of the photographed material. The calculation unit includes a total area calculation unit for calculating the total area of the material for each particle size classification in the photographed image, and a memory for storing a weight conversion coefficient that is the weight per predetermined area for each particle size classification in the photographed image. and a particle size distribution calculation unit for calculating the particle size distribution based on the total area and the weight conversion factor for each particle size division of the material. The weight conversion coefficient used to calculate the particle size distribution is the total area of each particle size category of the material in the photographed image taken by the imaging unit after the material whose weight is known for each particle size category is flowed down by the material flow part, and the known It is calculated in advance based on the weight of each particle size category of the material.

JP 2015-105898 A JP 2015-10952 A

By the way, when producing a CSG material, basically, the granular material to be used is subjected to a particle size test by a sieving test and a water content measurement by a drying method. However, in large-scale dam construction or the like, the amount of CSG materials to be used becomes enormous, and it is unrealistic to manually test and measure all CSG materials. Therefore, as described above, there have been proposed techniques for measuring or estimating the particle size distribution and moisture content of the granular material used in the CSG construction method.

However, in the technique described in Patent Document 1, when measuring the particle size distribution of a granular material, the ground material is spread thinly and an image is taken, and from the spread image, the grains of the ground material are analyzed by image analysis technology. Since the particle size distribution is measured by creating a diameter accumulation curve, there is a problem that sufficient measurement accuracy cannot be obtained.

That is, since it is difficult to evenly disperse the granular bodies (for example, soil particles) to be imaged so as not to overlap each other, the boundaries of the granular bodies become unclear. In addition, it is difficult to identify individual granules with relatively small particle diameters, and several granules with relatively small particle diameters may be collectively recognized as one large granule. overestimate the minutes. Furthermore, the presence of particles with a small particle size hidden behind particles with a relatively large particle size cannot be recognized.

In this regard, the technique described in Patent Document 2 does not have the above-mentioned problem because the granular material is flowed down and photographed, and the particle size distribution is calculated using the photographed image data, but a large amount of CSG material is used. There was room for further improvement when using it. In other words, when using a large amount of CSG material, various factors such as changes in the stock situation in the stockpile system and changes in the situation of the location where the CSG base material is extracted are taken into consideration when choosing the granular material to be used as the CSG material. Moisture content and particle size distribution must be measured quickly and accurately.

Although Patent Document 2 describes that the particle size distribution can be suitably measured in response to changes in the water content ratio, if the method of changing the weight conversion factor is not performed, the microwave moisture meter and the water content ratio Since it is said that the monitoring unit can be omitted, when using a large amount of CSG material, that is, when changing the moisture content and particle size distribution of the granular material for which the weight conversion factor is expected to be revised, continuous and rapid , is not intended to be an exact correspondence, nor is it implied.

Furthermore, there were various problems in the measurement of the moisture content as well. For example, the technology that continuously measures the water content using near-infrared light, etc., can only measure the water content of several hundred micrometers or less (1 mm or less) from the surface of the measured object. When , the measurement results are often affected by the color change, and the accuracy of the surface water content estimation decreases.

The present invention has been proposed in view of the above circumstances, and is capable of quickly and accurately measuring the moisture content and particle size distribution of granular materials used as CSG materials even when a large amount of CSG materials need to be supplied. It is an object of the present invention to provide a CSG material quality measurement/control method and a quality measurement/control system capable of continuously supplying an appropriate CSG material.

The quality measurement/control method and quality measurement/control system for CSG materials according to the present invention have the following features in order to achieve the above objects. That is, in the method for measuring and controlling the quality of CSG materials according to the present invention, a microwave moisture meter is used to measure the moisture content of a granular material used as a CSG material, and the granular material is uniformly dispersed and allowed to flow down. , the step of calculating the particle size distribution of the granular material by image analysis of the image data obtained by photographing the granular material flowing down.

Subsequently, a step of adjusting the water content of the granular material by adjusting the amount of water supplied to the granular material based on the measured value of the moisture content, and the granular material subjected to the moisture content adjustment is within the appropriate control value range and a step of determining whether the granular material is within the range of the appropriate control value, and the granular material whose judgment result is within the range of the appropriate control value is used as the CSG material, and whether the suitability judgment of the granular material is valid Perform the process of verifying Moreover, two or more kinds of granular materials are mixed and used, and the step of measuring the moisture content and the step of calculating the particle size distribution can be performed for each granular material.

In the CSG material quality measurement and control method having such a configuration, assuming the case of using a large amount of CSG material, even if the properties of the granular material used as the CSG material change, the mass and moisture content are measured almost simultaneously and continuously, the mass and water content of the granular material are appropriately and accurately measured.

Even when two or more types of granular materials with different properties are mixed and used, the step of measuring the moisture content and the step of calculating the particle size distribution are performed for each granular material, so the granular material used as the CSG material Appropriately and accurately measure and control the quality of CSG materials for the entire material.

In the CSG material quality measurement and control method having the above configuration, in the step of measuring the moisture content of the granular material and the step of calculating the particle size distribution, the number of data added each time a predetermined number of the latest data is added It is possible to calculate the particle size distribution and measure the moisture content by deleting the oldest data depending on the conditions.

In the CSG material quality measurement and control method having the above-described configuration, in the step of measuring the moisture content of the granular material and the step of calculating the particle size distribution, the moving average value of the latest predetermined number of data is calculated as the moisture content of the granular material and A particle size distribution is possible.

In the method for measuring and controlling the quality of the CSG material having such a configuration, the quality of the CSG material is measured and controlled appropriately and accurately by always measuring the quality of the CSG material using the latest data.

In the method for measuring and controlling the quality of CSG materials according to the present invention, as a step of verifying whether the judgment of suitability of the granular material is valid, the granular material used as the CSG material is measured by a sieving test. Particle size distribution data and water content data measured by a drying method are obtained to generate basic data for control values. Then, when it is determined that the granular material is not within the range of appropriate control values, the moisture content data and particle size distribution data of the granular material to be judged are compared with the basic data, and the suitability of the granular material is judged. is valid or not .

In such a configuration, if the determination that the granular material is not within the range of appropriate control values is valid, the granular material is inappropriate as a CSG material, so the supplied granular material is reviewed. . On the other hand, if the determination that the granular material is not within the range of appropriate control values is incorrect, it is due to a malfunction of the system that performs a series of processes related to the calculation of the particle size distribution of the granular material and the measurement of the moisture content. , Until the system is restored, the particle size distribution calculation by the sieving test and the moisture content measurement by the drying method will be carried out to manage the material blend, or the supply of the CSG material will be temporarily stopped.

In the method for measuring and controlling the quality of CSG materials having such a configuration, a series of steps (measurement of moisture content, determination of particle size distribution) of measuring and controlling the fluctuation tendency of the particle size and moisture content of the granular material used as the CSG material are performed. calculation, adjustment of moisture content, determination of suitable materials), important basic data are quickly and accurately calculated. The quality of the CSG material is appropriately and accurately measured and controlled by operating the granular material used as the CSG material so that it is always within an appropriate range of control values.

A quality measurement and control system for CSG materials according to the present invention includes moisture content measuring means for measuring the moisture content of granular materials used as CSG materials using a microwave moisture meter, and uniformity of the granular materials used as CSG materials. A particle size distribution calculating means for calculating the particle size distribution of the granular material by image analysis of image data obtained by photographing the falling granular material, and based on the measured value of the moisture content, the granular material A water content adjustment means for adjusting the water content of the granular material by adjusting the amount of water supply, and a determination means for determining whether or not the granular material subjected to the water content adjustment is within the range of appropriate control values. and means for verifying whether the suitability of the particulate material is valid. Further, two or more kinds of granular materials are mixed and used, and the water content measuring means and the particle size distribution calculating means can calculate the particle size distribution and measure the water content for each granular material.

In the moisture content measurement means and particle size distribution calculation means of the CSG material quality measurement and management system configured as described above, every time a predetermined number of the latest data is added, the oldest data is calculated according to the number of added data. It is possible to calculate the particle size distribution and measure the water content by removing it.

In the moisture content measuring means and particle size distribution calculating means of the CSG material quality measurement and management system configured as described above, the moving average value of the latest predetermined number of data can be used as the moisture content and particle size distribution of the granular material. be.

In addition, the CSG material quality measurement and control system according to the present invention measures the granular material used as the CSG material by a sieving test as a means of verifying whether the judgment of the suitability of the granular material is valid. Basic data generating means for acquiring particle size distribution data and water content data measured by a drying method to generate basic data of control values; and means for verifying whether or not the suitability of the granular material is correct by comparing the moisture content data and particle size distribution data of the granular material to be judged with the basic data. there is

As described above, if the determination that the granular material is not within the range of appropriate control values is valid, the granular material to be supplied is reviewed because the granular material is inappropriate as the CSG material. On the other hand, if the determination that the granular material is not within the range of appropriate control values is incorrect, it is due to a malfunction of the system that performs a series of processes related to the calculation of the particle size distribution of the granular material and the measurement of the moisture content. , Until the system is restored, the particle size distribution calculation by the sieving test and the moisture content measurement by the drying method will be carried out to manage the material blend, or the supply of the CSG material will be temporarily stopped.

In the CSG material quality measurement and control system having such a configuration, it is assumed that a large amount of CSG material is used. quality is measured and controlled.

In the quality measurement and control method and quality measurement and control system for CSG materials according to the present invention, a series of steps (measurement of water content , calculation of particle size distribution, adjustment of moisture content, and determination of appropriate materials) can be performed almost automatically and continuously without manual intervention.

In addition, by always using the latest data and also using the moving average value of the most recent data to perform material blending and quality control of the granular material to be used as the CSG material, it is possible to supply an appropriate CSG material.

In addition, by not only judging whether the granular material used as the CSG material is within the range of appropriate control values, but also by verifying the validity of the judgment, it is possible to supply even more suitable CSG materials. can.

As described above, according to the quality measurement/control method and quality measurement/control system for CSG materials according to the present invention, even if it is necessary to supply a large amount of CSG material, the granular material used as the CSG material is Since the moisture content and particle size distribution can be measured quickly and accurately, it is possible to continuously supply suitable CSG material.

4 is a flow chart of a CSG material quality measurement/control method according to an embodiment of the present invention. 1 is a functional block diagram of a CSG material quality measurement/management system according to an embodiment of the present invention; FIG. The functional block diagram of a particle size distribution calculation means. The schematic diagram of a particle size distribution calculation means. The schematic diagram which shows the measuring apparatus of water content. Control value determination graph of CSG material.

BEST MODE FOR CARRYING OUT THE INVENTION A quality measurement/control method and a quality measurement/control system for CSG materials according to embodiments of the present invention will be described below with reference to the drawings. 1 to 6 illustrate a CSG material quality measurement/control method and a quality measurement/control system according to an embodiment of the present invention. FIG. 1 is a flow chart of the CSG material quality measurement/control method, and FIG. 3 is a functional block diagram of the particle size distribution calculation means; FIG. 4 is a schematic diagram of the particle size distribution calculation means; FIG. FIG. 6 is a control value determination graph for CSG materials. In addition, in FIG. 5, (a) is a schematic diagram of the state seen from the side, and (b) is a schematic diagram of the state seen from above.

<CSG quality control>
A method for measuring and controlling the quality of a CSG material according to an embodiment of the present invention comprises almost automatically and continuously measuring the moisture content and particle size distribution of the granular material used in the CSG construction method to adjust the blending and moisture content. Therefore, it relates to a method capable of continuously supplying CSG material within the range of appropriate control values. In particular, it is a suitable method when a large amount of CSG material needs to be supplied continuously in order to construct a large-scale structure such as a dam or dam in a short period of time. By using such a method for measuring and controlling the quality of CSG materials, the quality of manufactured CSG can be appropriately controlled. The quality control of CSG is a concept that includes everything from blending of granular materials used as CSG materials to quality control of manufactured CSG (the same applies hereinafter).

<System used for quality control of CSG>
The CSG material quality measurement and management system according to the embodiment of the present invention relates to the system used for the above-described CSG quality control, and by using a system including a computer, the granular material used in the CSG method The moisture content and particle size distribution are measured almost automatically and continuously to adjust the formulation and moisture content.

<Quality measurement and management system for CSG materials>
The CSG material quality measurement and management system 100 according to the embodiment of the present invention is a system for performing quality measurement and management of granular materials used in the CSG method. As shown in FIG. , moisture content measuring means 20 , moisture content adjusting means 30 , and determination means 40 , and preferably includes basic data generation means 50 and determination correctness verification means 60 . Each means is composed of a device that performs each function, a computer, and a program installed therein. Computers and programs installed therein are a broad concept including devices having arithmetic functions such as personal computers, microcomputers, and PLCs, and programs installed therein.

<Granular material>
The granular material used as the CSG material is, for example, a gravel material that is locally generated material. By measuring the particle size distribution and the water content of this granular material and applying appropriate treatments such as adjusting the water content according to the measured values, it is possible to supply the CSG material within the range of appropriate control values. Moreover, the granular material is not limited to one type, and two or more types can be mixed and used. The granular material may be any material as long as it can be used as a CSG material, and in addition to gravel materials, recycled aggregate generated from concrete debris and earthquake debris, etc., slag, coal ash, etc. can be used. can be done.

Two or more types of particulate materials are, for example, particulate materials from different collection locations. In this case, the particle size distribution and moisture content measurements are carried out for each granular material. By using two or more types of granular materials in this way, even if it is necessary to use a large amount of CSG material or if one type of granular material does not satisfy the quality, appropriate material supply can be performed. be able to.

<Means for measuring water content>
The moisture content measuring means 20 is means for measuring the moisture content of the granular material using a microwave moisture meter. A microwave moisture meter is a device that irradiates a granular material with microwaves and measures the moisture content based on the difference in the amount of energy before and after the microwave passes through the granular material, and a known product can be used. can be done. In the measurement of the moisture content, for example, the granular material flowing on the feeder is spread evenly by a spreading device, and the moisture content is measured by irradiating the granular material with microwaves.

The moisture content measuring means 20 (microwave moisture meter) of this embodiment is provided in the supplying means 11 which is a component of the particle size distribution calculating means 10 . Specifically, as shown in FIG. 5, a leveling means 16 is provided at an appropriate position (upstream side) of the feeder 11b so that the granular material conveyed on the feeder 11b has an appropriate height (h). After spreading evenly, the mass and moisture content are measured. The moisture content measuring means 20 may be provided at other locations, or the moisture content measuring means 20 may be provided at a plurality of locations.

A specific description will be given of the measurement of the moisture content. As shown in FIG. 5, the feeder 11b is provided with mass measuring means 12 and water content measuring means (microwave moisture meter) 20. As shown in FIG. In the example shown in FIG. 5, the measuring range of the CSG material (granular material) by the mass measuring means 12 is 1 m×0.5 m×h=0.5 hm ³ , and the water content measuring means (microwave moisture meter) 20 is 0.25 m×0.25 m×h=0.0625 hm ³ .

The corrected moisture content per ^cubic meter of CSG material can be obtained by subtracting the moisture content from the required moisture content. Here, with respect to the moisture content u calculated by the microwave moisture meter, the wet weight w _s of the CSG material soil particles in the measurement range of the microwave moisture meter, and the water content _ww , the following equations (1) and (2) are obtained. It holds.
_{u=ww/(ws +ww )} ( 1 )
w _w = u/(1−u)× w _s (2)
Therefore, in the example shown in FIG. 5, the water content _Ww in the CSG material weighing range can be obtained by the following formula (3).
Moisture content W _w = w _w × (0.5/0.0625) (3)

When two or more types of granular materials are used, the moisture content is measured and the particle size distribution is calculated for each granular material. At this time, a means for measuring the moisture content and a means for calculating the particle size distribution are installed for each type of granular material.

<Particle size distribution calculation means>
As shown in FIGS. 3 and 4, the particle size distribution calculating means 10 is means for analyzing the particle size distribution by uniformly dispersing the granular material and allowing it to flow down, and photographing the flowing granular material. A device that supplies the material, a device that calculates the weight (mass) of the granular material, a device that diffuses the granular material and makes it flow down, a device that photographs the flowing granular material, and an analysis of the particle size distribution of the granular material based on the imaging data. It has a series of devices consisting of devices that In the present embodiment, these series of device groups will be referred to as supplying means 11, mass measuring means 12, diffusion flow-down means 13, imaging means 14, and particle size distribution analyzing means 15, respectively.

<Supply Means>
The supply means 11 are means for supplying granular material. As shown in FIG. 4, the supply means 11 includes a belt conveyor 11a that lifts the received granular material, a feeder 11b that conveys the granular material lifted by the belt conveyor 11a to the diffusion flow means 13, and a belt conveyor. and a hopper 11c for causing the granular material lifted by 11a to flow down onto the feeder 11b. Further, the supply means 11 is not limited to the belt conveyor 11a, the feeder 11b, and the hopper 11c. A power shovel or the like may be used.

When the feeder 11b is used as one element of the supply means 11, as shown in FIG. 5, it is preferable to provide a spreading means 16 for thinly spreading the granular material on the feeder 11b. That is, by providing the spreading means 16 at an appropriate position of the feeder 11b and thinly spreading the granular material conveyed on the feeder 11b, the granular material spreads uniformly when flowing down by the diffusion flow-down means 13, Since the particles of the granular material do not overlap, the accuracy of the particle size distribution analysis can be improved. The spreading means 16 may be any device as long as it can spread the granular material thinly and evenly. Arrange the rods.

<Mass measuring means>
The mass measuring means 12 is a device for measuring the mass of the granular material supplied to the diffusion flow-down means 13, and as shown in FIGS. 4 and 5, is provided on the feeder 11b in this embodiment. This mass measuring means 12 is incorporated inside the feeder 11b, as shown in FIG. The mass measuring means 12 shown in FIG. 5 has a feeder belt stretched between a pair of weighing rollers 12a, and a load cell 12b, which is a load detector, provided below the feeder belt.

<Diffusion Flow Means>
The diffusion flow-down means 13 is a means for uniformly diffusing and flowing down the granular material supplied from the supply means 11 . As shown in FIG. 4, the diffusion flow-down means 13 of the present embodiment is composed of a pair of plate-like members arranged facing each other, and the granular material uniformly diffuses when flowing down between the pair of plate-like members. . The interval between the pair of plate-like members is appropriately set according to the granular material used, but it is necessary to prevent clogging due to clogging of the maximum grain size material contained in the granular material.

Note that the diffusion flow-down means 13 is not limited to the pair of plate-like members shown in FIG. For example, it may be a device having a cylindrical container and a cylindrical, triangular-pyramidal, square-pyramidal, conical, or a combination of these diffusing parts housed inside the container.

<Imaging means>
The imaging means 14 is a means for photographing the granular material uniformly diffused by the diffusion flow-down means 13 . The imaging means 14 of this embodiment is composed of a digital camera equipped with an imaging lens system, an imaging element, a transmission interface for transmitting image data, etc., although not shown. Further, as a component of the imaging means 14, an illumination device for illuminating the granular material to be imaged may be included. As the lighting device, for example, it is preferable to use an LED light whose light quantity and color temperature can be adjusted.

The imaging lens system of the imaging means 14 (digital camera) may have a single focal point, but may have a focusing mechanism, a pan/tilt mechanism, and a zoom mechanism. Further, the image capturing means 14 (digital camera) may be a camera that captures still images or a camera that captures moving images.

In this embodiment, one of the plate-like members constituting the diffusion flow-down means 13 is used as a background screen for photographing. It is installed in a position where it does not Moreover, in order to improve the accuracy of the particle size distribution analysis, the imaging means 14 (digital cameras) may be installed at a plurality of locations. Moreover, it is preferable to use a material having a color that provides a clear contrast with the color tone of the granular material to be photographed for the plate-like member that serves as the background screen. Furthermore, in order to improve the analysis accuracy of the particle size distribution by preventing missing shots of the granular material, it is preferable to shorten the interval between shots of the granular material by the imaging means 14 (digital camera) as much as possible. That is, the shorter the photographing interval, the more the accuracy of particle size distribution analysis can be improved.

<Particle size distribution analysis means>
The particle size distribution analysis means 15 is means for analyzing the particle size distribution of the granular material by image analysis of the image data captured by the imaging means 14 . For example, the particle size distribution analysis means 15 consists of a personal computer (PC) and image analysis software, and performs image analysis based on the image data received from the imaging means 14 by the functions of the image analysis software installed in the personal computer. , to analyze the particle size distribution of the granular material to be analyzed. Any known method may be used for the image analysis, but basically, a method of recognizing the contour of the granular material based on the image data and analyzing the grain size of the granular material is used.

<Analysis of particle size distribution>
Analysis of the particle size distribution is performed by the particle size distribution analysis means 15 . An example of the procedure for analyzing the particle size distribution will be described below, but other techniques may be used for the analysis of the particle size distribution. The analysis of the particle size distribution is performed by the function of the particle size distribution analysis means 15. A regression equation is created for each particle size using a granular material with a known particle size distribution, and the created regression equation Substituting the explanatory variable calculated from the image analysis result of the granular material to calculate the mass ratio to be analyzed for each particle size, and using the calculated mass ratio to be analyzed for each particle size, the particle size of the granular material to be analyzed Analyze the distribution.

<Specific particle size distribution analysis method>
Next, an example of a particle size distribution analysis method will be described. Analysis of particle size distribution is roughly divided into six steps. The first step is to use a granular material with a known particle size distribution to calculate the soil particle average short diameter (Di) and the total projected area (Si) for each particle size in the granular material. In the second step, the total projected area (Si) for each particle size is divided by the total projected area (ΣSi), which is the sum of the total projected areas (Si) for each particle size, to make it dimensionless, thereby obtaining the projected area ratio ( This is the step of calculating Si/ΣSi). In the third step, using a granular material with a known particle size distribution, the total mass (Mi) for each particle size is divided by the total mass (ΣMi), which is the sum of the total mass (Mi) for each particle size. It is a step of calculating the mass ratio (Mi/ΣMi) by dividing the In the fourth step, mass ratio (Mi/ΣMi) is used as the objective variable, and multiple regression analysis is performed with soil particle average minor diameter (Di) and projected area ratio (Si/ΣSi) as explanatory variables. It is a process to create. Through the first step, second step, third step, and fourth step, a regression equation for each particle size, which is the basis of particle size distribution analysis, is created.

It is preferable to classify the water content ratio into a plurality of ranges and to create a different regression equation for each water content ratio of each class. As a result, accurate particle size distribution analysis can be performed without being affected by the water content. Here, the number of boundary values for classifying the water content ratio is 1 or 2 or more. This boundary value is appropriately set according to the soil quality of the granular material. For example, a limit value at which the granular material aggregates can be set as the boundary value.

In the fifth step, the analysis target soil particle average short diameter (Di) and the analysis target projected area ratio (Si/ΣSi) calculated from the image analysis results of the granular material to be analyzed are substituted into the created regression equation. This is the step of calculating the analysis target mass ratio (Mi/ΣMi) for each particle size. The sixth step is a step of analyzing the particle size distribution of the granular material to be analyzed using the analysis target mass ratio (Mi/ΣMi) of each particle size calculated in the fifth step. Through this sixth step, the particle size distribution of the granular material to be analyzed can be analyzed.

Further, in the fourth step, by adding the reciprocal of the absolute amount of projected area (1/Si) as an explanatory variable, the particle size distribution can be analyzed more accurately. In this case, in the step (fifth step) of calculating the mass ratio to be analyzed (Mi / ΣMi), the value to be substituted into the regression equation is the absolute amount of projected area calculated from the image analysis result of the granular material to be analyzed. The calculation is performed by adding the reciprocal (1/Si).

<Update of data used for analysis of particle size distribution>
It is preferable to update the data of the regression equation used for the particle size distribution analysis according to the construction progress. That is, every time a predetermined number of newest data are added, the oldest data are deleted according to the number of added data to calculate the particle size distribution. The number of data to be added and deleted can be appropriately set according to the state of the granular material. For example, for granular materials with small changes in particle size distribution, the interval between data addition and deletion is extended (increase the number of data) to update the data, and for granular materials with large changes in particle size distribution, data addition and deletion are performed. Shorten the interval (reduce the number of data) and update the data.

<Moisture Content Adjusting Means>
The water content adjusting means 30 is a means for adjusting the water content of the granular material by adjusting the amount of water supplied to the granular material based on the measured value of the water content. The moisture content adjusting means 30 includes, for example, a water supply pump, a water injection device, a kneading device, etc., and adjusts the amount of water to be added based on the measured moisture content to produce granular particles containing an appropriate amount of moisture. material. Note that the moisture content adjusting means 30 is not limited to the above-described example, and a known technique can be used as long as it is possible to adjust the amount of water supplied to the granular material based on the measured value of the moisture content.

<Determination means>
The determination means 40 is means for determining whether or not the granular material subjected to water content adjustment is within the range of appropriate control values, and is composed of, for example, a computer and a program installed therein. Appropriate control values are determined by so-called rhombus control, as shown in FIG. The control value determination graph for CSG materials shown in FIG. 6 has the strength of CSG on the vertical axis and the unit water amount on the horizontal axis. The final quality control diamond is defined by excluding areas where workability cannot be satisfied due to a large amount of water. In the example shown in FIG. 6, the control value is within the numeric range of the filled diamond.

The determination means 40 compares a predetermined control value with the grain size and unit water content of the granular material whose water content has been adjusted, and determines whether the granular material whose water content has been adjusted is within the appropriate control value range. Determine whether or not If the granular material subjected to water content adjustment is within the range of appropriate control values, it can be used as it is as a CSG material. On the other hand, if the granular material subjected to water content adjustment is not within the range of appropriate control values, appropriate measures are taken to bring the granular material within the appropriate control values.

<Basic data generation means>
When producing the CSG material, a sieving test is performed on the granular material to measure the particle size distribution, and the moisture content is measured by a drying method (hereinafter referred to as the basic method). Although the measurement by the basic method is performed manually, it is accompanied by human empirical judgment, so the possibility of erroneous judgment due to malfunction of the measuring equipment is extremely low. Therefore, it is desirable to perform the mechanical continuous measurement described above and to perform the measurement by the basic method at predetermined intervals (for example, every 1 hour, 6 hours, 12 hours). As a result, it is possible to take appropriate measures against erroneous determinations due to defects in the quality measurement/management system 100 or the like.

In this embodiment, basic data of control values are generated based on the data obtained by the measurement work according to the basic method, and it is verified whether the judgment by the judging means 40 is appropriate. That is, in this embodiment, the particle size distribution data measured by the sieving test and the moisture content data measured by the drying method are obtained for the granular material used as the CSG material, and the strength and moisture content of the granular material are obtained. A basic data generating means 50 for generating management value data (basic data) is provided, and a judgment correctness verifying means 60, which will be described later, verifies whether or not the judgment in the judging means 40 is appropriate.

<Judgment correctness verification means>
If the determination means 40 determines that the granular material is not within the range of appropriate control values, the determination correctness verification means 60 verifies the water content data, the particle size distribution data, and the basic data of the determination target granular material. are compared to verify whether or not the suitability judgment of the granular material is correct, and is composed of, for example, a computer and a program installed therein.

<Response to verification>
In this embodiment, the following measures are taken based on the verification result of the determination correctness verification means 60 . If the determination that the granular material is not within the range of appropriate control values is valid, the granular material is inappropriate as a CSG material, so the supplied granular material is reviewed. On the other hand, if the determination that the granular material is not within the range of appropriate control values is incorrect, it is due to a malfunction of the system that performs a series of processes related to the calculation of the particle size distribution of the granular material and the measurement of the moisture content. , Until the system is restored, the particle size distribution calculation by the sieving test and the moisture content measurement by the drying method will be carried out to manage the material blend, or the supply of the CSG material will be temporarily stopped. Then, when it is confirmed that the system has been restored, the quality control by the CSG material quality measurement/management system 100 is resumed.

<Method for measuring and controlling quality of CSG material>
In the CSG material quality measurement and control method according to the embodiment of the present invention, as shown in FIG. 1, a microwave moisture meter is used to measure the moisture content of the granular material used as the CSG material (S1-1). At the same time, the granular material is uniformly dispersed and allowed to flow down, and the particle size distribution of the granular material is calculated by image analysis of image data obtained by photographing the flowing granular material (S1-2). Although the moisture content of the granular material is usually measured first, the moisture content may be measured after the particle size distribution is calculated, or the moisture content may be measured before and after the particle size distribution is calculated. good too. Furthermore, it is preferable to measure the water content of other materials (such as sand) used as CSG materials.

Subsequently, based on the measured moisture content, the amount of water supplied to the granular material is adjusted to adjust the moisture content of the granular material (S2). Then, it is determined whether or not the granular material subjected to the water content adjustment is within the range of appropriate control values (S3), and the granular material whose determination result is within the range of appropriate control values is used as the CSG material. (S4).

When two or more types of granular materials are mixed and used, the step of measuring the moisture content (S1-1) and the step of calculating the particle size distribution (S1-2) are performed for each granular material. Further, in the step of measuring the moisture content of the granular material (S1-1) and the step of calculating the particle size distribution (S1-2), every time a predetermined number of the latest data is added, according to the number of added data It is preferable to delete the oldest data before calculating the particle size distribution and measuring the moisture content. Furthermore, in the step of measuring the moisture content of the granular material (S1-1) and the step of calculating the particle size distribution (S1-2), the moving average value of the latest predetermined number of data is used as the moisture content and particle size distribution of the granular material. preferably.

When judging the validity of the judgment result, the particle size distribution data measured by the sieving test for the granular material used as the CSG material and the moisture content data measured by the drying method are obtained, and the control value Basic data is generated (S5). Then, the water content data and particle size distribution data of the granular material to be judged are compared with the basic data (S6) to verify whether the suitability judgment of the granular material is valid (S7).

Here, if the determination is valid, the granular material to be supplied is reviewed because the granular material is inappropriate as the CSG material (S8). Then, it is determined whether or not the material has become a suitable granular material (S9), and if it has become a suitable granular material, the quality control by the CSG material quality measurement/management system 100 is resumed.

On the other hand, if the determination that the granular material is not within the range of appropriate control values is incorrect, it is due to a malfunction of the system that performs a series of processes related to the calculation of the particle size distribution of the granular material and the measurement of the moisture content. , To restore the system (S10), until the system is restored, calculate the particle size distribution by a sieving test and measure the moisture content by the drying method to manage the material blend, or temporarily suspend the supply of CSG materials to stop. Then, system restoration is confirmed (S11), and when it is confirmed that the system has been restored, quality control by the CSG material quality measurement/management system 100 is resumed.

In this embodiment, the validity of the determination is determined only when it is determined that the granular material is not within the appropriate control value range. The validity of the determination may also be determined when the determination is made. However, since tests based on the Basic Law are conducted at predetermined time intervals, whether or not the judgment of the system is valid must be done after waiting for the results of the tests based on the Basic Law. Therefore, if the system determines that the particulate material is within the appropriate control values, rely on the system's determination, and if the basic method test results are not within the appropriate control values, The material should be reviewed.

Further, in the CSG material quality measurement/control method and quality measurement/control system according to the present invention, the mass and water content of the granular material used as the CSG material are approximately Simultaneous and continuous measurements. As described above, the feeder 11b that conveys the granular material is provided with the mass measuring means 12 and the water content measuring means 20, and the granular material that is continuously conveyed on the feeder 11b is measured by the leveling means 16. After the mass and water content are continuously measured, the particle size distribution is analyzed by the particle size distribution calculating means 10 .

As described above, the CSG material quality measurement/control method and quality measurement/control system according to the present invention can always grasp the mass and water content of the granular material used as the CSG material. For this reason, even if the particle size analysis is performed with a certain amount of time interval, since the mass and moisture content are continuously measured, if the quality change that deviates from the control value occurs in the supplied granular material, You can immediately recognize that.

Therefore, when a change in the quality of the granular material that deviates from the control value is recognized due to a change in the mass or moisture content of the supplied granular material, appropriate measures such as reviewing the granular material used are taken. By doing so, even when a large amount of CSG material needs to be supplied, it is possible to continuously supply an appropriate CSG material.

<Difference between the present invention and conventional technology>
As described above, in the CSG material quality measurement/control method and quality measurement/control system according to the present invention, the granular material used as the CSG material is uniformly dispersed and flowed down, and the image data of the flowing down granular material is captured. By image analysis, the particle size distribution of the granular material is calculated. By having such characteristics, it is possible to evenly disperse the granular material and take an image with a uniform thickness.

Therefore, the data used when calculating the particle size distribution of the granular material becomes accurate, and the calculation accuracy of the particle size distribution can be improved. Therefore, in a series of processes (measurement of moisture content, calculation of particle size distribution, adjustment of moisture content, determination of appropriate material) of measuring and managing the fluctuation tendency of the particle size and moisture content of the granular material used as the CSG material, Particle size distribution, which is one of important basic data, can be calculated quickly and accurately.

In this regard, in the technique described in Patent Document 1, in order to calculate the particle size distribution of the granular material, the granular material is spread out in a plane, an image is taken, and the photographed image is processed using a technique such as labeling or pattern matching. The particle size distribution is calculated by detecting the contour of That is, the technique described in Patent Document 1 shoots an image by spreading a granular material on a sheet laid on the ground surface.

In such a conventional technique, since the granular material is spread out in a plane, it is difficult to uniformly disperse the granular material and spread it thinly. Then, when the granular materials overlap each other, the relatively small granular materials cannot be discriminated, and a plurality of granular materials are recognized as one. Also, small particulate material may be hidden behind larger particulate material and may not be recognized. For this reason, the coarse particle fraction is overestimated, and the calculation accuracy of the particle size distribution cannot be improved. In other words, in a series of processes of measuring and controlling the fluctuation tendency of the particle size and water content of the granular material used as the CSG material, if the particle size distribution, which is one of the important basic data, is not accurate, appropriate cannot manage.

In the technique described in Patent Document 2, the particle size distribution is calculated using the photographed image data after the granular material is allowed to flow down. However, when a granular material whose properties may change is used continuously, such as when a large amount of CSG material needs to be used, there is a concern that appropriate measures cannot be taken.

When it is necessary to use a large amount of CSG material, such as when large-scale dam construction must be completed in a short period of time, for example, the CSG base material can be stockpiled using the stockpile method, or multiple The CSG base material is collected from the collection site. In this case, it is assumed that the moisture content of the stocked CSG base material changes due to weather changes, or that the properties of the CSG base material sampled from a plurality of sampling locations are different.

In this regard, in the CSG material quality measurement/control method and quality measurement/control system according to the present invention, the mass and moisture content of the granular material used as the CSG material are measured almost simultaneously and continuously. Even if the properties of the granular material change, the mass and moisture content of the granular material can be measured appropriately and accurately.

In addition, when two or more types of granular materials are mixed and used, the step of measuring the moisture content and the step of calculating the particle size distribution are performed for each granular material, so there are granular materials with different properties depending on the difference in the sampling location. However, the mass and moisture content of the entire granular material used as the CSG material can be measured appropriately and accurately.

In addition, in the step of measuring the moisture content of the granular material and the step of calculating the particle size distribution, the latest data is always used, and the moving average value of the latest data is used, so that the mass and moisture content are more appropriate and can be measured accurately.

Thus, in the CSG material quality measurement/control method and quality measurement/control system according to the present invention, a series of steps ( Important basic data can be quickly and accurately calculated in the measurement of moisture content, calculation of particle size distribution, adjustment of moisture content, and determination of appropriate materials. In addition, we judge whether the granular materials used as CSG materials are within the range of appropriate control values and verify the validity of the judgment, so we can supply even more appropriate CSG materials. .

REFERENCE SIGNS LIST 10 particle size distribution calculation means 11 supply means 11a belt conveyor 11b feeder 11c hopper 12 mass measurement means 13 diffusion flow means 14 imaging means 15 particle size distribution analysis means 16 leveling means 20 water content measurement means 30 water content adjustment means 40 determination means 50 Basic data generation means 60 Judgment correctness verification means 100 Quality measurement/management system

Claims (8)

A method for quality measurement and control of CSG materials used in the CSG construction method,
By using a microwave moisture meter to measure the moisture content of the granular material used as the CSG material, the granular material is uniformly dispersed and flowed down, and image analysis is performed on the image data of the flowing granular material. , to calculate the particle size distribution of the granular material,
adjusting the amount of water supplied to the granular material based on the measured moisture content to adjust the moisture content of the granular material;
Determine whether the granular material subjected to moisture content adjustment is within the range of appropriate control values,
Using a granular material whose judgment result is within the range of appropriate control values as a CSG material,
Acquire particle size distribution data measured by a sieving test and moisture content data measured by a drying method for a granular material used as a CSG material, and generate basic data of control values,
When it is judged that the granular material is not within the range of appropriate control values, the water content data and particle size distribution data of the granular material to be judged are compared with the basic data, and the suitability judgment of the granular material is justified. verify whether or not
A quality measurement and control method for a CSG material characterized by: Two or more types of the particulate material are mixed and used,
The step of measuring the moisture content and the step of calculating the particle size distribution are performed for each granular material,
The method for measuring and controlling the quality of CSG materials according to claim 1, characterized in that: In the step of measuring the moisture content of the granular material and the step of calculating the particle size distribution, every time a predetermined number of latest data are added, the oldest data is deleted according to the number of added data to calculate the particle size distribution. and measuring the moisture content,
The method for measuring and controlling the quality of CSG materials according to claim 1 or 2, characterized in that: In the step of measuring the moisture content of the granular material and the step of calculating the particle size distribution, the moving average value of the latest predetermined number of data is used as the moisture content and particle size distribution of the granular material.
The method for measuring and controlling the quality of a CSG material according to any one of claims 1 to 3, characterized in that: A system for quality measurement and management of CSG materials used in the CSG construction method,
Moisture content measuring means for measuring the moisture content of the granular material used as the CSG material using a microwave moisture meter;
A particle size distribution calculation means for calculating the particle size distribution of the granular material by uniformly dispersing the granular material used as the CSG material and causing it to flow down, and performing image analysis on image data obtained by photographing the flowing granular material;
water content adjusting means for adjusting the water content of the granular material by adjusting the amount of water supplied to the granular material based on the measured value of the water content;
Determination means for determining whether the granular material subjected to moisture content adjustment is within the range of appropriate control values;
a basic data generation means for acquiring particle size distribution data measured by a sieving test and moisture content data measured by a drying method for a granular material used as a CSG material to generate basic data of control values;
When it is judged that the granular material is not within the range of appropriate control values, the water content data and particle size distribution data of the granular material to be judged are compared with the basic data, and the suitability judgment of the granular material is justified. Judgment correctness verification means for verifying whether or not
A quality measurement and management system for CSG materials, comprising: Two or more types of the particulate material are mixed and used,
The water content measuring means and the particle size distribution calculating means perform calculation of the particle size distribution and measurement of the water content for each granular material.
The quality measurement/management system for CSG materials according to claim 5 , characterized in that: In the moisture content measuring means and the particle size distribution calculating means, every time a predetermined number of newest data are added, the oldest data are deleted according to the number of added data to calculate the particle size distribution and measure the moisture content. ,
The quality measurement/management system for CSG materials according to claim 5 or 6, characterized in that: In the moisture content measuring means and particle size distribution calculating means, the moving average value of the latest predetermined number of data is used as the moisture content and particle size distribution of the granular material,
The quality measurement/management system for CSG materials according to any one of claims 5 to 7, characterized in that:

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