JP5221936B2 - Surface water ratio measurement system and surface water ratio measurement method - Google Patents

Description

  The present invention relates to a surface water ratio measuring system and a surface water ratio measuring method for measuring the surface water ratio of a ground material.

  In recent dam construction, research on trapezoidal CSG dams has been actively conducted in order to rationalize materials, rationalize design, and rationalize construction. The trapezoidal CSG dam is a trapezoidal dam using CSG (Cemented Sand and Gravel), which is a mixture of water and concrete with CSG material, which is the ground material. The CSG material is a rocky base material such as riverbed gravel, etc., which is not adjusted for classification, etc., and can be easily collected around the construction site. As described above, since the trapezoidal CSG dam uses a material that is relatively easy to secure, such as a CSG material, environmental conservation and cost reduction can be achieved as compared with a conventional gravity concrete dam.

Since such CSG material is not adjusted for classification or the like as described above, it is necessary to manage on the assumption that there are variations in particle size and surface water ratio. In particular, in order to manage the strength of CSG, it is necessary to appropriately control the amount of water mixed into the CSG material. For example, in the construction of trapezoidal CSG dams, it is recommended within the industry to correct the amount of water to be mixed by measuring the surface water rate once per hour as the quality control of CSG materials on the day of construction. Yes. In order to appropriately control the amount of water mixed in such a CSG material, it is necessary to accurately obtain the surface water ratio of the CSG material. Here, conventionally, as a simple method for measuring the surface water content of the CSG material, a method called “microwave method” or “fry pan method” is known (see Non-Patent Document 1 below). ).
"Method and explanation of soil test", Geotechnical Society of Japan, March 2000, first revised edition, p. 61-67.

  However, according to the microwave oven method and the frying pan method, a measurement time of at least about 1 hour is required, and it is difficult to smoothly realize the recommended management. Furthermore, in the above microwave oven method and frying pan method, it is difficult to automatically control the amount of water to be mixed because the surface water ratio cannot be obtained immediately and continuously. Therefore, there is a need for a measurement method that can instantaneously and continuously obtain the surface water ratio of the CSG material.

  Then, an object of this invention is to provide the surface water rate measuring system and surface water rate measuring method which can obtain the surface water rate of a ground material immediately and continuously.

The surface water rate measuring system of the present invention is a surface water rate measuring system that continuously measures the surface water rate of the ground material, and includes a cylindrical transfer cylinder part that defines a transfer path through which the ground material is transferred, and radiation. A radiation emitting part that emits radiation, and a radiation incident part that makes the radiation from the radiation emitting part enter , and the radiation is transmitted through the ground material transported in the transporting cylinder part and related to the surface water ratio of the ground material An RI measuring device that continuously measures a physical quantity, and the radiation emitting unit and the radiation incident unit sandwich at least a part of the transport path between each other, and the linear distance between them is determined by the RI measuring device. as the effective maximum measuring distance below is defined as the maximum distance in the range that allows an effective measurement of the physical quantity is installed on the outer wall surface of the conveyance tubular portion, the outer wall surface of the conveyance tubular portion in a direction orthogonal to each other First wall surface extending and It has a second wall surface, the radiation emitting portion is attached to the first wall surface, the radiation incident portion is attached to the second wall surface, and the outer wall surface of the transfer cylinder portion is the first wall surface. And a fourth wall surface facing the second wall surface, and the radiation emitting portion is attached to a position closer to the second wall surface than the fourth wall surface. The transport cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and is a part having a reduced cross-sectional area at the lower part of the cylindrical body .

Further, the surface water ratio measuring method of the present invention is a surface water ratio measuring method for continuously measuring the surface water ratio of the ground material, wherein the ground material is transported by a transport path defined by a cylindrical transport cylinder portion. An RI measuring device having a transport step, a radiation emitting section for emitting radiation, and a radiation incident section for making radiation from the radiation emitting section incident, and transmitting the radiation to the ground material being transported in the transport cylinder section An RI measurement step for continuously measuring a physical quantity related to the surface water content of the material, and in the RI measurement step, the radiation emitting part and the radiation incident part are sandwiched between each other with at least a part of the transport path. The linear distance between them is set on the outer wall surface of the transport cylinder so that the effective distance of the physical quantity measured by the RI measuring apparatus is not more than the maximum effective measurement distance defined as the maximum distance, Transport cylinder The outer wall surface has a first wall surface and a second wall surface extending in directions orthogonal to each other, the radiation emitting portion is attached to the first wall surface, and the radiation incident portion is attached to the second wall surface. The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface and a fourth wall surface facing the second wall surface, and the radiation emitting portion is 4 is attached to a position closer to the second wall surface than the wall surface of 4, and the transfer cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and the cross-sectional area is reduced at the lower part of the cylindrical body It is a part .

According to this system and method, the ground material is transported along the transport path defined by the transport cylinder. A radiation emitting part and a radiation incident part of the RI measurement apparatus are installed on the outer wall surface of the transport cylinder part so as to sandwich at least a part of the transport path. Then, radiation is transmitted through the ground material transported by the transport path in the transport cylinder portion by the RI measuring device, and a physical quantity related to the surface water ratio is immediately and continuously measured. At this time, even when the transport path is designed to be thick so as to increase the transport flow of the ground material, the linear distance between the radiation emitting part and the radiation incident part is set to be less than the maximum effective measurement distance of the RI measuring device. Therefore, the measurement of the physical quantity of the ground material conveyed in the conveyance cylinder part is performed effectively. Further, in this system and method, the outer wall surface of the transfer cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other, and the radiation emitting portion is attached to the first wall surface. The radiation incident part is attached to the second wall surface. Such a configuration of the outer wall surface and the arrangement of the radiation emitting part and the radiation incident part make it easy to bring the radiation emitting part and the radiation incident part close to each other, and effective measurement by the RI measurement apparatus becomes easier. Further, in this system and method, the outer wall surface of the transport cylinder portion further includes a third wall surface facing the first wall surface and a fourth wall surface facing the second wall surface, and the radiation emitting portion Is attached at a position closer to the second wall surface than the fourth wall surface. With this configuration, the radiation emitting unit and the radiation incident unit can be brought closer to each other.

The surface water rate measuring system of the present invention is a surface water rate measuring system that continuously measures the surface water rate of the ground material, and includes a cylindrical transfer cylinder part that defines a transfer path through which the ground material is transferred, and radiation. A radiation emitting part that emits radiation, and a radiation incident part that makes the radiation from the radiation emitting part enter , and the radiation is transmitted through the ground material transported in the transporting cylinder part and related to the surface water ratio of the ground material An RI measuring device that continuously measures a physical quantity, and the radiation emitting unit and the radiation incident unit sandwich at least a part of the transport path between each other, and the linear distance between them is determined by the RI measuring device. as the effective maximum measuring distance below is defined as the maximum distance in the range that allows an effective measurement of the physical quantity is installed on the outer wall surface of the conveyance tubular portion, the outer wall surface of the conveyance tubular portion in a direction orthogonal to each other First wall surface extending and It has a second wall surface, the radiation emitting portion is attached to the first wall surface, the radiation incident portion is attached to the second wall surface, and the outer wall surface of the transfer cylinder portion is the first wall surface. And a fourth wall surface facing the second wall surface, and the radiation incident portion is attached to a position closer to the first wall surface than the third wall surface. The transport cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and is a part having a reduced cross-sectional area at the lower part of the cylindrical body .

Further, the surface water ratio measuring method of the present invention is a surface water ratio measuring method for continuously measuring the surface water ratio of the ground material, wherein the ground material is transported by a transport path defined by a cylindrical transport cylinder portion. An RI measuring device having a transport step, a radiation emitting section for emitting radiation, and a radiation incident section for making radiation from the radiation emitting section incident, and transmitting the radiation to the ground material being transported in the transport cylinder section An RI measurement step for continuously measuring a physical quantity related to the surface water content of the material, and in the RI measurement step, the radiation emitting part and the radiation incident part are sandwiched between each other with at least a part of the transport path. The linear distance between them is set on the outer wall surface of the transport cylinder so that the effective distance of the physical quantity measured by the RI measuring apparatus is not more than the maximum effective measurement distance defined as the maximum distance, Transport cylinder The outer wall surface has a first wall surface and a second wall surface extending in directions orthogonal to each other, the radiation emitting portion is attached to the first wall surface, and the radiation incident portion is attached to the second wall surface. The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface and a fourth wall surface facing the second wall surface, and the radiation incident portion is 3 is attached to a position closer to the first wall surface than the wall surface 3, and the transport cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and the cross-sectional area is reduced at the lower part of the cylindrical body It is a part .

According to this system and method, the ground material is transported along the transport path defined by the transport cylinder. A radiation emitting part and a radiation incident part of the RI measurement apparatus are installed on the outer wall surface of the transport cylinder part so as to sandwich at least a part of the transport path. Then, radiation is transmitted through the ground material transported by the transport path in the transport cylinder portion by the RI measuring device, and a physical quantity related to the surface water ratio is immediately and continuously measured. At this time, even when the transport path is designed to be thick so as to increase the transport flow of the ground material, the linear distance between the radiation emitting part and the radiation incident part is set to be less than the maximum effective measurement distance of the RI measuring device. Therefore, the measurement of the physical quantity of the ground material conveyed in the conveyance cylinder part is performed effectively. Further, in this system and method, the outer wall surface of the transfer cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other, and the radiation emitting portion is attached to the first wall surface. The radiation incident part is attached to the second wall surface. Such a configuration of the outer wall surface and the arrangement of the radiation emitting part and the radiation incident part make it easy to bring the radiation emitting part and the radiation incident part close to each other, and effective measurement by the RI measurement apparatus becomes easier. Further, in this system and method, the outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface, and a fourth wall surface facing the second wall surface, and the radiation incident portion Is attached at a position closer to the first wall surface than the third wall surface. With this configuration, the radiation emitting unit and the radiation incident unit can be brought closer to each other.

  In the surface water ratio measurement system according to the present invention, the minimum width of the transfer cylinder portion in the plane orthogonal to the transfer path may be larger than the effective measurement maximum distance of the RI measurement apparatus. In this case, if the radiation emitting part and the radiation incident part of the RI measuring device are arranged to face each other on the outer wall surface of the transport cylinder part, the linear distance between the radiation emitting part and the radiation incident part is an effective measurement of the RI measuring apparatus. It must be larger than the maximum distance. The present invention can be suitably applied particularly when the transport cylinder portion has such a configuration, and the linear distance between the radiation emitting portion and the radiation incident portion can be made equal to or less than the effective measurement maximum distance of the RI measurement apparatus. it can.

  Further, the surface water content measurement system of the present invention includes a plurality of the RI measurement devices, and one of the RI measurement devices is an RI moisture meter that measures the amount of water contained in the ground material, and the RI measurement. One of the other devices may be an RI density meter that measures the density of the ground material.

  In this case, the surface water content measurement system of the present invention is based on the value of the moisture content contained in the ground material measured by the RI moisture meter and the value of the density of the ground material measured by the RI density meter. In addition, surface water ratio calculating means for calculating the surface water ratio of the ground material may be further provided.

  In the surface water content measurement system of the present invention, the ground material may be a CSG material.

  According to the surface water content measurement system and the surface water content measurement method of the present invention, it is possible to obtain the surface water content of the ground material immediately and continuously.

  Hereinafter, a preferred embodiment of a surface water ratio measurement system and a surface water ratio measurement method according to the present invention will be described in detail with reference to the drawings.

  A CSG manufacturing facility 10 shown in FIG. 1 is a CSG (Cemented Sand and CSG) used as a material of a trapezoidal CSG dam by mixing cement and water with a CSG material as a ground material collected around the construction site of the trapezoidal CSG dam. Equipment for manufacturing Gravel). Here, the CSG material is a rocky base material such as riverbed gravel, and is not adjusted for classification and the like, and is mixed with gravels of various sizes. Such a CSG material can be easily collected around the construction site of the trapezoidal CSG dam, and therefore contributes to a reduction in construction cost by using it as an aggregate. Note that the CSG material introduced into the CSG manufacturing facility 10 has been previously subjected to a process of removing and crushing oversized gravel, and the maximum particle size of the CSG material is about 80 mm.

  The CSG manufacturing facility 10 includes a belt conveyor 3 for introducing a CSG material, a hopper 5 into which the CSG material is charged, a belt conveyor 7 for conveying the CSG material that has passed through the hopper 5, and a mixing device 9. . Furthermore, the CSG manufacturing facility 10 includes a cement addition unit 13 for adding cement to the CSG material conveyed by the belt conveyor 7 and a water supply unit 15 for adding water. The belt conveyor 3, the hopper 5, the belt conveyor 7, and the mixing device 9 constitute a conveyance path A that conveys the CSG material in this order. While the CSG material introduced into the CSG manufacturing facility 10 is transported along the transport path A, cement and water are added in the belt conveyor 7, mixed by the mixing device 9, and processed into CSG.

  In order to manage the strength of the CSG produced by the CSG production facility 10, it is necessary to appropriately control the amount of water supplied from the water supply unit 15. And since control of the amount of water supply requires information on the surface water ratio of the CSG material, it is necessary to immediately and continuously obtain the surface water ratio of the CSG material. Therefore, the CSG manufacturing facility 10 includes the surface water ratio measurement system 1 that obtains the surface water ratio of the CSG material conveyed through the conveyance path A on the upstream side of the water supply unit 15.

  The surface water content measurement system 1 is based on information obtained from an RI moisture meter (RI measurement device) 21 and an RI density meter (RI measurement device) 23, and an RI moisture meter 21 and an RI density meter 23 installed in the hopper 5. And a surface water ratio calculating unit (surface water ratio calculating means) 25 for determining the surface water ratio of the CSG material. Further, the CSG manufacturing facility 10 includes the surface water rate calculation unit 25 and has a control information management unit 17 that controls the amount of water supplied from the water supply unit 15 based on the obtained surface water rate. For example, a personal computer or the like may be used as the control information management unit 17. The control information management unit 17 also has a function of controlling the cement addition unit 13 and adjusting the amount of cement added to the CSG material.

  Hereinafter, the RI moisture meter 21, the RI density meter 23, and the hopper 5 will be described in detail with reference to FIGS. As shown in the figure, the hopper 5 includes a cubic hopper body 31 that receives the CSG material 100 from the belt conveyor 3. A discharge cylinder 33 having a reduced cross-sectional area is provided below the hopper body 31. The CSG material 100 dropped from the downstream end of the belt conveyor 3 is introduced into the hopper body 31 from the upper opening of the hopper body 31, is transported downward in the hopper body 31, and further vertically through the discharge cylinder 33. It is conveyed downward and discharged from the lower opening to the belt conveyor 7 (FIG. 1) (conveying step).

  The discharge cylinder part 33 is a part having a square cross-section, and constitutes a conveyance cylinder part that defines a conveyance path A1 that is a part of the conveyance path A (FIG. 1). The cross-sectional area of the discharge cylinder portion 33 is set to an area that can sufficiently secure the necessary flow rate of the CSG material 100 in the conveyance path A. The horizontal cross section of the discharge cylinder portion 33 is, for example, a square having a side of 70 cm here. It is said that. The discharge cylinder portion 33 has four outer wall surfaces 331, 332, 333, and 334 that form a vertical surface. Among these, the outer wall surface 332 is located on the front side in the transport direction of the belt conveyor 3. Further, the outer wall surface 334 faces the outer wall surface 332 in parallel and is located on the rear side in the transport direction.

  Further, the outer wall surface 331 and the outer wall surface 333 are outer wall surfaces orthogonal to the outer wall surfaces 332 and 334 and face each other in parallel. In the discharge cylinder portion 33, four ridge lines are formed as sides where the outer wall surfaces 331 to 334 intersect with each other. In the following description, a ridge line between the outer wall surface 331 and the outer wall surface 332 is used. Edge line E1, edge line between outer wall surface 332 and outer wall surface 333 is edge line E2, edge line between outer wall surface 333 and outer wall surface 334 is edge line E3, and edge line between outer wall surface 334 and outer wall surface 331 is edge line E4 .

  The RI moisture meter 21 is a device that measures the amount of moisture contained in an object by transmitting the neutron beam through the object. The RI moisture meter 21 analyzes an emission unit 21a that emits a neutron beam, an incident unit 21b that receives and detects a neutron beam from the emission unit 21a that has passed through the object, and a neutron beam detected by the incidence unit 21b. And a control unit (not shown) for obtaining the water content of the object. The RI density meter 23 is a device that measures the density of an object by transmitting gamma rays through the object. The RI density meter 23 analyzes the gamma ray detected by the incident unit 23b, the incident unit 23b that emits and detects the gamma ray from the emission unit 23a that has passed through the object, and the gamma ray detected by the incident unit 23b. And a control unit (not shown) for obtaining the density of. The control unit of the RI moisture meter 21 and the control unit of the RI density meter 23 described above may be included in the control information management unit 17.

  In such RI moisture meter 21 and RI density meter 23, it becomes more difficult to obtain an accurate measurement value as the linear distance between the emission unit 21a (23a) and the incident unit 21b (23b) increases. Therefore, in this type of RI moisture meter 21 and RI density meter 23, the maximum of the emission unit 21a (23a) and the incidence unit 21b (23b) for enabling effective measurement with satisfactory measurement accuracy. The distance is set. Alternatively, such a maximum distance may be set as a specification of the device. This distance is referred to as “effective measurement maximum distance” in the following description. The maximum effective measurement distance in the RI moisture meter and RI density meter is generally about 35 cm. Here, the case where the effective measurement maximum distances of the RI moisture meter 21 and the RI density meter 23 are both set to 35 cm will be described as an example.

  Here, since the horizontal cross section of the discharge cylinder part 33 is a square having a side of 70 cm as described above, the minimum width in the horizontal cross section of the discharge cylinder part 33 is 70 cm, which is larger than the effective measurement maximum distance 35 cm. . Accordingly, if the emission unit 21a and the emission unit 21a are arranged on the outer wall surface of the discharge cylinder 33 so as to face each other, the linear distance between the emission unit 21a and the emission unit 21a exceeds the effective measurement maximum distance of 35 cm. End up. As a result, it becomes impossible to measure the water content of the CSG material with the RI moisture meter 21. Similarly, it is impossible to measure the density of the CSG material by the RI density meter 23. On the other hand, if the size of the discharge cylinder portion 33 is to be reduced, the required flow rate of the CSG material in the CSG manufacturing apparatus 10 may not be ensured.

  Therefore, in this surface water content measurement system 1, the emission unit 21 a of the RI moisture meter 21 is attached to the outer wall surface 331 (first wall surface) of the discharge tube portion 33, and faces the inside of the discharge tube portion 33. (I.e., toward the transport path A1). An incident unit 21b for making the neutron beam incident is attached to an outer wall surface 332 (second wall surface) adjacent to the outer wall surface 331. The installation position of the emission unit 21a is closer to the outer wall surface 332 (second wall surface) than the outer wall surface 334 (fourth wall surface), and the installation position of the incident unit 21b is set to the outer wall surface 333 (third wall surface). ) Is closer to the outer wall surface 331 (first wall surface). Further, the exit unit 21a and the entrance unit 21b are installed at the same distance from the ridgeline E1 and are located at the same height.

  With such an arrangement, the output unit 21a and the incident unit 21b are positioned closest to each other with the ridge line E1 interposed therebetween, so that the linear distance between the output unit 21a and the incident unit 21b can be reduced. According to this arrangement, even if the minimum width in the horizontal cross section of the discharge cylinder portion 33 is larger than the effective measurement maximum distance 35 cm of the RI moisture meter 21, the linear distance between the emission unit 21a and the incident unit 21b is effective. The maximum measurement distance can be 35 cm or less. For example, in the example shown in the figure, the linear distance between the emission unit 21a and the incidence unit 21b can be set to about 20 to 30 cm due to a geometric relationship.

  Based on this configuration, when the emission unit 21a emits a neutron beam toward the inside of the discharge tube portion 33, the neutron beam passes through the CSG material 100 in the vicinity of the ridgeline E1 and enters the incident unit 21b. And in the control part of RI moisture meter 21, a predetermined calculation is performed based on the neutron beam detected by incident unit 21b, and the moisture content per unit weight of CSG material 100 is obtained (RI measurement step). Each parameter used for the calculation of the water content is determined by a prior calibration test and incorporated in the control unit. The value of the water content obtained here is input to the surface water ratio calculation unit 25 (FIG. 1) of the control information management unit 17.

  As described above, by setting the linear distance between the emission unit 21a and the incident unit 21b to be an effective measurement maximum distance of 35 cm or less, the RI moisture meter 21 is used to convey the conveyance path between the emission unit 21a and the incident unit 21b. The water content of the CSG material in A1 can be measured. Further, by adopting the RI moisture meter, it is possible to obtain a measured value instantly and to continuously obtain the moisture content of the CSG material being conveyed in the conveyance path A1.

  Similarly, the emission unit 23a of the RI density meter 23 is attached to the outer wall surface 334 of the discharge cylinder portion 33, and emits gamma rays toward the inside of the discharge cylinder portion 33 (that is, toward the conveyance path A1). can do. Further, the incident unit 23 b is attached to the outer wall surface 333. The emission unit 23 a is attached to a position closer to the outer wall surface 333 than the outer wall surface 331, and the incident unit 23 b is attached to a position closer to the outer wall surface 334 than the outer wall surface 332. In addition, the exit unit 23a and the entrance unit 23b are installed at the same distance from the ridgeline E3 and located at the same height.

  With such an arrangement, the output unit 23a and the incident unit 23b are positioned closest to each other with the ridge line E3 interposed therebetween, so that the linear distance between the output unit 23a and the incident unit 23b can be reduced. According to such an arrangement, even if the minimum width in the horizontal cross section of the discharge cylinder portion 33 is larger than the effective measurement maximum distance 35 cm of the RI density meter 23, the linear distance between the exit unit 23a and the entrance unit 23b. Can be set to an effective measurement maximum distance of 35 cm or less.

  Based on this configuration, when the emission unit 23a emits gamma rays toward the inside of the discharge cylinder portion 33, the gamma rays pass through the CSG material 100 in the vicinity of the ridge line E3 and enter the incident unit 23b. Then, the controller of the RI density meter 23 performs a predetermined calculation based on the gamma rays detected by the incident unit 23b to obtain the density of the CSG material 100 (RI measurement step). Each parameter used for the density calculation is determined by a prior calibration test and incorporated in the control unit. The density value obtained here is input to the surface water ratio calculation unit 25 (FIG. 1) of the control information management unit 17.

  As described above, similarly to the RI moisture meter 21 described above, by setting the linear distance between the emission unit 23a and the incident unit 23b to be equal to or less than the effective measurement maximum distance, the RI unit 23 is used to enter the incident unit 23a. The density of the CSG material in the transport path A1 between the unit 23b can be measured. Moreover, by adopting the RI density meter, it is possible to obtain a measured value instantly and to obtain continuously the density of the CSG material being conveyed in the conveyance path A1.

As described above, the surface water content calculation unit 25 receives the moisture content value (referred to as ρmR) from the RI moisture meter 21 and the density value (referred to as ρtR) from the RI density meter. And the surface water rate calculation part 25 calculates the surface water rate HRI (%) of the CSG material 100 by the following formulas (1) and (2).
wRI = ρmR · 100 / (ρtR−ρmR) (1)
HRI = (wRI−Q) / (1 + Q / 100) (2)
Here, wRI represents the water content ratio (%) of the CSG material 100. Q represents the water absorption rate (%) of the CSG material 100, and the value of Q is separately input to the control information management unit 17.

  The control information management unit 17 controls the water supply unit 15 to correct the water supply amount when the surface water rate calculated by the surface water rate calculation unit 25 changes suddenly. For example, the water supply unit 15 is controlled so as to decrease the water supply amount when the surface water rate HRI rapidly increases and to increase the water supply amount when the surface water rate HRI decreases rapidly. By controlling the amount of water supplied in this way, the strength of the CSG, which is the material of the trapezoidal CSG dam, can be managed uniformly regardless of the fluctuation of the surface water ratio of the CSG material.

  Moreover, when measuring the surface water rate of the CSG material by a frying pan method or a microwave oven method, the result may be biased depending on the sampling method of the CSG material. The surface water rate measuring system 1 and the surface water rate measuring method described above. According to the method, sampling is unnecessary, which is excellent in that such a problem does not occur. Further, in the surface water ratio measurement system 1 and the surface water ratio measurement method, the CSG material can be directly input to a personal computer or the like, compared with the frying pan method or the microwave oven method, and automatic control of the water supply unit 15 can be achieved. This makes it possible to save labor in CSG quality control. In addition, the surface water content measurement system 1 and the surface water content measurement method are not required to be complicatedly modified by attaching the emission units 21a, 23a and the incident units 21b, 23b to the outer wall surface of the hopper 3. The existing hopper 3 can be used.

  By the way, according to the surface water percentage measurement system 1 and the surface water percentage measurement method described above, the water content of some CSG materials 100 passing near the ridgeline E1 is measured, and some other parts passing near the ridgeline E3. The density of the CSG material 100 is measured, and the surface water percentage is calculated based on these measured values. Here, since the particle size distribution of the CSG material 100 is not necessarily uniform in the hopper 5, it is also conceivable that the obtained surface water ratio does not correctly represent the surface water ratio of the CSG material 100 as a whole. For example, as shown in FIG. 2, when the CSG material is transported by the belt conveyor 3 and put into the hopper 5, the larger the particle size, the more it is thrown forward when dropping from the belt conveyor 3. It is considered that the one having a large particle size tends to be biased toward the side near the outer wall surface 332 of the hopper 5.

  Therefore, the present inventors conducted an experiment to evaluate the effectiveness of the surface water ratio measurement system 1 and the surface water ratio measurement method in the CSG manufacturing facility 10 described above. In this experiment, for the same CSG material sample, the surface water ratio is measured by the above-mentioned surface water ratio measuring system 1 and the surface water ratio is measured by the drying method specified in JIS A 1203: 1999. Both measurements were compared. For all the measured data, a correlation diagram of both measured values is shown in FIG. 5, and a histogram of deviations of both measured values is shown in FIG.

  5 and 6, it can be seen that most of the data is distributed within the range of deviation ± 1.0% (in the range between the broken lines in FIG. 5). As a result, the surface water content measurement system 1 and the surface water content measurement method have an effective accuracy within 1.0%, and can be employed in the same manner as the drying method in measuring the surface water content of the CSG material. confirmed. Note that data having an extremely large deviation are indicated as x in FIG. 5 as singular points and as hatched portions in FIG.

  Furthermore, the present inventors similarly conducted an experiment for evaluating the effectiveness even when the density measurement by the RI densitometer 23 was omitted from the surface water ratio measurement system 1 described above. That is, in this case, a fixed value was input to the surface water ratio calculation unit 25 instead of the measurement value of the RI density meter 23. This is because the variation in density is considered to be small if the CSG material is collected from the same site. And the measurement of the surface water rate by the surface water rate measurement system 1 omitting the RI density meter 23 and the measurement of the surface water rate by the drying method were performed on the same CSG material sample, and the measured values were compared. . For all the measured data, a correlation diagram of both measurement values is shown in FIG. 7, and a histogram of deviations of both measurement values is shown in FIG.

  7 and 8, it can be seen that most of the data is distributed within the range of deviation ± 1.0% (in the range between the broken lines in FIG. 7). From this result, even when the density measurement by the RI densitometer 23 was omitted, it was confirmed that the effective accuracy of the surface water content measurement system 1 and the surface water content measurement method was within 1.0%. From this result, as long as the CSG material collected from the same site is used, even if the density measurement by the RI densitometer 23 is omitted, the surface water rate measurement system 1 and the surface water rate measurement method are expected to have the same effective accuracy. I found that I can do it. Note that data having an extremely large deviation are indicated as cross points in FIG. 7 as singular points and as hatched portions in FIG.

  The present invention is not limited to the embodiment described above. For example, in the surface water ratio measurement system 1, the cross-sectional shape of the discharge cylinder portion 33 is a square, but other cross-sectional shapes such as other regular polygons and circles may be used. For example, in consideration of the case where a circular discharge section 35 shown in FIG. 9 is adopted instead of the discharge section 33, a flat surface 35a in contact with the mounting surface of the emission unit 21a (23a) and an incident unit 21b (23b) It is preferable to set the mounting positions of both units so that the angle α at which the flat surface 35b in contact with the mounting surface intersects is 30 ° or more. In such an attachment position, neutron rays (gamma rays) are converted into CSG when the linear distance between the emission unit 21a (23a) and the incident unit 21b (23b) is 35 cm due to geometric conditions. The material 100 can be transmitted through the center of a particle having a particle diameter of 80 mm, and an accurate measurement can be performed.

  Further, in the surface water content measurement system 1, the emission unit 21a and the incidence unit 21b of the RI moisture meter 21 are installed so as to be close to each other with the ridge line E1 interposed therebetween, and the emission unit 23a and the incidence unit 23b of the RI density meter 23 are arranged. However, the installation positions of the RI moisture meter 21 and the RI density meter 23 may be a combination other than this. In the following description, for example, “the RI measurement device is positioned at the ridgeline E1 position” so that the exit unit and the incident unit are placed close to each other with the ridgelines E1 to E4 in the positional relationship as described above. It is simply expressed as “installed in”.

  For example, as shown in FIG. 10, the RI moisture meter 21 may be installed at the ridgeline E1 position, and the RI density meter 23 may be installed at the ridgeline E2 position. According to this configuration, the moisture content value and the density value are measured for the CSG material having almost the same particle size composition from the symmetry of the particle size distribution of the CSG material in the hopper 5, and the surface water content is calculated. A high surface water ratio.

  In addition, as shown in FIG. 11, if the RI moisture meter 21 and the RI density meter 23 are installed vertically at the same ridge line position, the surface water content is based on the water content value and density value of the CSG material at substantially the same position. Therefore, it is considered preferable in that a more accurate surface water ratio can be obtained. On the other hand, in the above-described surface water content measurement system 1 and the embodiment shown in FIG. 10, there is no need for a space for arranging the units of the RI moisture meter 21 and the RI density meter 23 in the vertical direction. It is preferable at the point which can suppress.

  In addition, as shown in FIG. 12, a plurality of RI moisture meters 21 and RI density meters 23 (two in this case) may be installed at the positions of the ridgelines E1 to E4. Further, as described above, only the RI moisture meter 21 may be installed in the discharge cylinder unit 33, the RI density meter 23 may be omitted, and a fixed value of density may be input to the control information management unit 17. Also in this case, a plurality of RI moisture meters 21 may be used. In the surface water content measurement system 1, two types of equipment, an RI moisture meter 21 and an RI density meter 23, are prepared. By adopting an RI moisture density meter having both functions, an exit / incident unit is provided. The installation space may be reduced.

  Further, the surface water content measurement system 1 uses the measurement data obtained by the RI densitometer 23 to estimate the recoil rate (ratio of particle size 25.6 mm) of the CSG material to determine the particle size and the mixing of different materials. There is a possibility that it can be expanded to other usage methods. In addition, you may employ | adopt combining each structure mentioned above suitably.

It is a block diagram which shows the CSG manufacturing equipment with which the surface water rate measuring system and surface water rate measuring method which concern on this invention are applied. It is a perspective view which shows the belt conveyor and hopper which are contained in the CSG manufacturing equipment of FIG. It is sectional drawing of the perpendicular direction of the hopper of FIG. It is a horizontal sectional view in the discharge cylinder part of the hopper of FIG. It is a correlation diagram which shows the result of the experiment by the present inventors. It is a histogram which shows the result of the experiment by the present inventors. It is a correlation diagram which shows the result of the experiment by the present inventors. It is a histogram which shows the result of the experiment by the present inventors. It is a horizontal sectional view which shows the example which installs an output unit and an incident unit in the discharge cylinder part which has a circular cross section. It is a horizontal sectional view showing other examples which install RI moisture meter and RI density meter in the discharge cylinder part of a hopper. It is a perspective view which shows the further another example which installs RI moisture meter and RI density meter in the discharge cylinder part of a hopper. It is a horizontal sectional view showing other examples which install RI moisture meter and RI density meter in the discharge cylinder part of a hopper.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Surface water content measurement system, 21 ... RI moisture meter (RI measuring device), 21a ... Ejection unit (radiation emitting part), 21b ... Incident unit (radiation incident part), 23 ... RI density meter (RI measuring device), 23a ... Ejecting unit (radiation emitting part), 23b ... Injecting unit (radiation incident part), 25 ... Surface water ratio calculating part (surface water ratio calculating means), 33 ... Discharge cylinder part (conveying cylinder part), 331 ... Outer wall (First wall surface), 332 ... outer wall surface (second wall surface), 333 ... outer wall surface (third wall surface), 334 ... outer wall surface (fourth wall surface), 100 ... CSG material (ground material), A , A1... Transport path.

Claims (8)

In the surface water content measurement system that continuously measures the surface water content of the ground material,
A cylindrical transport cylinder portion defining a transport path through which the ground material is transported;
The ground material has a radiation emitting part that emits radiation and a radiation incident part that causes the radiation from the radiation emitting part to enter , and transmits the radiation to the ground material that is transported in the transport cylinder part. An RI measuring device that continuously measures a physical quantity related to the surface water ratio of
The radiation emitting part and the radiation incident part are:
Sandwiching at least part of the transport path between each other,
The linear distance between each other is less than or equal to the maximum effective measurement distance defined as the maximum distance of the range that allows effective measurement of the physical quantity by the RI measurement device,
It is installed on the outer wall surface of the transfer cylinder part,
The outer wall surface of the transport cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other,
The radiation emitting unit is attached to the first wall surface,
The radiation incident part is attached to the second wall surface,
The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface, and a fourth wall surface facing the second wall surface,
The radiation emitting portion is attached at a position closer to the second wall surface than the fourth wall surface,
The surface water rate measurement system according to claim 1, wherein the transfer cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and is a part having a reduced cross-sectional area at a lower part of the cylindrical body . In the surface water content measurement system that continuously measures the surface water content of the ground material,
A cylindrical transport cylinder portion defining a transport path through which the ground material is transported;
The ground material has a radiation emitting part that emits radiation and a radiation incident part that causes the radiation from the radiation emitting part to enter , and transmits the radiation to the ground material that is transported in the transport cylinder part. An RI measuring device that continuously measures a physical quantity related to the surface water ratio of
The radiation emitting part and the radiation incident part are:
Sandwiching at least part of the transport path between each other,
The linear distance between each other is less than or equal to the maximum effective measurement distance defined as the maximum distance of the range that allows effective measurement of the physical quantity by the RI measurement device,
It is installed on the outer wall surface of the transfer cylinder part,
The outer wall surface of the transport cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other,
The radiation emitting unit is attached to the first wall surface,
The radiation incident part is attached to the second wall surface,
The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface, and a fourth wall surface facing the second wall surface,
The radiation incident part is attached to a position closer to the first wall surface than the third wall surface,
The surface water rate measurement system according to claim 1, wherein the transfer cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and is a part having a reduced cross-sectional area at a lower part of the cylindrical body . The surface water rate measurement system according to claim 1 or 2 , wherein a minimum width of the transfer cylinder portion in a plane orthogonal to the transfer path is larger than the effective measurement maximum distance of the RI measurement apparatus. A plurality of the RI measuring devices;
One of the RI measuring devices is an RI moisture meter that measures the amount of moisture contained in the ground material,
The surface water rate measuring system according to any one of claims 1 to 3 , wherein one of the other RI measuring devices is an RI density meter that measures the density of the ground material. Based on the water content value of the ground material measured by the RI moisture meter and the density value of the ground material measured by the RI density meter, the surface water content of the ground material is calculated. The surface water ratio measuring system according to claim 4 , further comprising a surface water ratio calculating means. The surface water rate measurement system according to any one of claims 1 to 5 , wherein the ground material is a CSG material. In the surface water content measurement method that continuously measures the surface water content of the ground material,
A transport step for transporting the ground material in a transport path defined by a cylindrical transport tube section;
An RI measurement device having a radiation emitting unit that emits radiation and a radiation incident unit that makes the radiation from the radiation emitting unit incident thereon, and transmits the radiation to the ground material being conveyed in the conveying cylinder unit. A RI measurement step for continuously measuring a physical quantity related to the surface water ratio of the ground material,
In the RI measurement step,
The radiation emitting part and the radiation incident part are
Sandwiching at least part of the transport path between each other,
The linear distance between each other is less than or equal to the maximum effective measurement distance defined as the maximum distance of the range that allows effective measurement of the physical quantity by the RI measurement device,
Installed on the outer wall surface of the transfer cylinder part,
The outer wall surface of the transport cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other,
The radiation emitting unit is attached to the first wall surface,
The radiation incident part is attached to the second wall surface,
The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface, and a fourth wall surface facing the second wall surface,
The radiation emitting portion is attached at a position closer to the second wall surface than the fourth wall surface,
The method for measuring the surface water ratio , wherein the transport cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and a cross-sectional area is reduced at a lower part of the cylindrical body . In the surface water content measurement method that continuously measures the surface water content of the ground material,
A transport step for transporting the ground material in a transport path defined by a cylindrical transport tube section;
An RI measurement device having a radiation emitting unit that emits radiation and a radiation incident unit that makes the radiation from the radiation emitting unit incident thereon, and transmits the radiation to the ground material being conveyed in the conveying cylinder unit. A RI measurement step for continuously measuring a physical quantity related to the surface water ratio of the ground material,
In the RI measurement step,
The radiation emitting part and the radiation incident part are
Sandwiching at least part of the transport path between each other,
The linear distance between each other is less than or equal to the maximum effective measurement distance defined as the maximum distance of the range that allows effective measurement of the physical quantity by the RI measurement device,
Installed on the outer wall surface of the transfer cylinder part,
The outer wall surface of the transport cylinder portion has a first wall surface and a second wall surface extending in directions orthogonal to each other,
The radiation emitting unit is attached to the first wall surface,
The radiation incident part is attached to the second wall surface,
The outer wall surface of the transfer cylinder portion further includes a third wall surface facing the first wall surface, and a fourth wall surface facing the second wall surface,
The radiation incident part is attached to a position closer to the first wall surface than the third wall surface,
The method for measuring the surface water ratio , wherein the transport cylinder part is a part of a cylindrical body having openings at both upper and lower ends, and a cross-sectional area is reduced at a lower part of the cylindrical body .

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