Embankment material quality management system and embankment material quality management method

Abstract

To easily and quickly measure a grain size distribution of soil used as a material in a construction site of banking.SOLUTION: A banking material quality management system 100 comprises: an imaging device 1 including a portable housing 11 which has an opening 11a on the upper surface, first imaging means 12 which is provided in the housing 11 and images first soil having a relatively large grain size that is input from the opening 11a and is dropping in the housing 11 and second imaging means 12 which is provided in the housing 11 and images second soil having a relatively small grain size that is placed in the housing 11 or the first soil; and a measurement device 2 which measures a grain size distribution of the first soil on the basis of the image of the first soil obtained by the first imaging means 12 and measures a grain size distribution of the second soil on the basis of the image of the second soil obtained by the second imaging means 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an embankment material quality management system and an embankment material quality management method.

Background Art

[0002] The quality management of soil used as embankment material has been carried out based on visual inspection and the results of particle size tests defined by JIS. However, by visual inspection, only the general properties (particle size, color) of the soil could be discriminated. On the other hand, the particle size test requires large-scale equipment (such as a drying furnace) and takes at least about two days for measurement. Therefore, in recent years, a method has been proposed in which soil intended to be used as a material is photographed with a CMOS camera and the obtained soil image is analyzed to measure the particle size distribution of the soil (see, for example, Non-Patent Document 1, Patent Documents 1 and 2).

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the method described in Non-Patent Document 1 measures the particle size distribution on a vehicle for transporting soil, and still requires large-scale equipment. In addition, this method only measures gravelly soil with a relatively large particle size (20 mm or more). Moreover, the methods described in Patent Documents 1 and 2 measure the particle size distribution of soil used in dams and the like, and still require large-scale equipment such as using a belt conveyor for transporting soil. In addition, this method also only measures gravelly soil with a relatively large particle size (5 mm or more). Therefore, conventional methods such as those described in Non-Patent Document 1 and Patent Documents 1 and 2 may be difficult to use at earthwork construction sites where it is difficult to install large-scale equipment. In addition, earthwork may be constructed of sandy soil with a relatively small particle size, but conventional methods may not be able to handle the measurement of the particle size distribution of such sandy soil in some cases.

[0006] The present invention has been made in view of the above problems, and an object thereof is to enable easy and rapid measurement of the particle size distribution of soil used as a material at an earthwork construction site.

Means for Solving the Problems

[0007] To solve the above problems, the invention according to claim 1 is an earthwork material quality management system, a portable housing having an opening on the upper surface, a first imaging means provided on the housing for imaging first soil having a relatively large particle size that is dropped into the housing through the opening and is falling inside the housing, a second imaging means provided on the housing for imaging second soil having a relatively small particle size or the first soil that is placed inside the housing, an imaging device comprising: a measuring device that measures the particle size distribution of the first soil based on an image of the first soil obtained by the first imaging means and measures the particle size distribution of the second soil based on an image of the second soil obtained by the second imaging means, characterized by comprising.

[0008] Moreover, the invention according to claim 2 is an embankment material quality management system according to claim 1, comprising a camera attached to the housing and capable of switching between a state in which the lens is directed horizontally and a state in which the lens is directed downward, wherein the camera with the lens directed horizontally forms the first photographing means, and the camera with the lens directed downward forms the second photographing means.

[0009] Moreover, the invention according to claim 3 is an embankment material quality management system according to claim 1 or claim 2, wherein the measuring device also measures the color of the first soil or the color of the second soil based on the first soil image or the second soil image obtained by the second photographing means.

[0010] Moreover, the invention according to claim 4 is an embankment material quality management system according to any one of claims 1 to 3, comprising a dispersion part provided above the opening, having an inclined surface that slopes downward in a direction away from the first photographing means, and at least one protrusion provided on the inclined surface for dispersing the first soil sliding down on the inclined surface in a direction perpendicular to the direction in which it falls along the inclined surface.

[0011] Moreover, the invention according to claim 5 is an embankment material quality management method, including an installation step of installing a photographing device at a construction site of an embankment, the photographing device comprising a portable housing having an opening on the upper surface, a first photographing means for photographing a first soil having a relatively large particle size that is dropped into the housing through the opening, and a second photographing means for photographing a second soil having a relatively small particle size placed in the housing. When the soil used as the material is the first soil, a first sample taken from the first soil is put into the opening, and when the soil used as the material is the second soil, a second sample taken from the second soil is placed in the housing; a sample supply step a photographing step of photographing the first sample falling in the housing by the first photographing means, or photographing the second sample placed in the housing by the second photographing means a measuring step of measuring the particle size distribution of the first soil based on the image of the first soil obtained by the first photographing means, or measuring the particle size distribution of the second soil based on the image of the second soil obtained by the second photographing means, or measuring the particle size distribution of the first soil based on the image of the first sample obtained in the photographing step, or measuring the particle size distribution of the second soil based on the image of the second sample; a measuring device a determination step of determining whether the first soil or the second soil is suitable for construction based on the particle size distribution obtained in the measurement step characterized by comprising

Advantages of the Invention

[0012] According to the present invention, at the construction site of an embankment, the particle size distribution of the soil used as the material can be easily and quickly measured.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the technical scope of the present invention is not limited to those exemplified in the following embodiments and drawings.

[0015] <1. Embankment Material Quality Management System> First, an embankment material quality management system (hereinafter, System 100) according to an embodiment of the present invention will be described. FIG. 1 is a side view showing an example of System 100, FIG. 2 is a rear view showing an example of an imaging device included in System 100, and FIG. 3 is a front view showing the upper part of the imaging device when the first soil is being loaded.

[0016] System 100 includes, for example, as shown in FIG. 1, an imaging device 1 and a measuring device 2. The system 100 according to the present embodiment further includes a power supply device 3.

[0017] (Imaging Device) The imaging device 1 includes a housing 11 and a camera 12. In the present embodiment, the imaging device 1 further includes a dispersion unit 13, a first illumination unit 14, a second illumination unit 15, and a tray 16.

[0018] The housing 11 is a portable type having an opening 11a on its upper surface. The housing 11 according to the present embodiment has a vertically long rectangular parallelepiped shape. Further, as shown in FIG. 2, the housing 11 according to the present embodiment has a second opening 11b on its back surface. Further, the housing 11 according to the present embodiment includes a camera support portion 11c. As shown in FIG. 1, the camera support portion 11c has a rod shape. One end of the camera support portion 11c is pivotally supported by a shaft rod 11d extending in the left - right direction at the lower end portion of the second opening 11b, and it can rotate around the shaft rod 11d.

[0019] Note that the housing 11 does not necessarily have to be box - shaped as long as it is configured to be able to support the camera 12.

[0020] The dispersing portion 13 is provided above the opening 11a of the housing 11 and disperses the first soil S 1 that is put into the opening 11a. The first soil S 1 is soil with relatively large particle size that is intended to be used as a soil - filling material. The first soil S according to the present embodiment 1 is gravelly soil containing gravel within the range of 2 - 75 mm in particle size. The dispersing portion 13 according to the present embodiment has an inclined surface 13a and at least one protrusion 13b. The dispersing portion 13 according to the present embodiment further has a hopper 13c.

[0021] The inclined surface 13a is provided above the opening 11a and is inclined so as to descend in a direction away from the camera 12. The inclined surface 13a according to the present embodiment is inclined so as to descend forward. The protrusion 13b is provided on the inclined surface 13a, and the first soil S 1Disperse it in a direction along the inclined surface 13a and orthogonal to the falling direction. As described above, since the inclined surface 13a according to the present embodiment is inclined downward toward the front, the protrusion 13b according to the present embodiment disperses the first soil S 1 in the left - right direction. The hopper 13c is provided above the upper part of the inclined surface 13a and is configured to drop the input first soil S 1 onto the upper part of the inclined surface 13a. With the dispersion part 13 configured in this way, the first soil S input into the hopper 13c 1 will fall through the housing 11 in a state of being dispersed in the left - right direction.

[0022] Also, as shown in FIG. 1, the dispersion part 13 according to the present embodiment is configured to be movable in the horizontal direction (front - rear direction) (the width of the opening 11a of the housing 11 in the front - rear direction can be adjusted). By doing so, when the particle size of the first soil S to be input is relatively large, by lowering the dispersion part 13 backward (widening the opening 11a of the housing 11), it is possible to prevent the first soil S 1 from being clogged between the opening 11a and the dispersion part 13. 1 Also, by moving the dispersion part 13 forward (bringing it closer to the front part of the housing 11), the first soil S falling will hit the back surface of the front part of the housing 11, and the first soil S 1 will be more dispersed. 1

[0023] The camera 12 is attached to the housing 11 and, as shown in FIG. 1, can be switched between a state where the lens 12a is directed horizontally and a state where the lens 12a is directed downward. The camera 12 according to the present embodiment is fixed to the camera support part 11c of the housing 11, and the above - mentioned switching is enabled by rotating together with the camera support part 11c. The camera 12 with the lens directed horizontally can photograph the first soil S 1 falling through the opening 11a and into the housing 11. On one hand, the camera 12 with the lens facing downward is placed inside the housing 11 and can photograph the second soil S 2 or the first soil S 1 . The second soil S 2 is soil with a relatively small particle size that is planned to be used as a soil filling material. The second soil S according to this embodiment 2 is sandy soil containing sand with a particle size of 2 mm or less. That is, the camera 12 with the lens facing horizontally forms the first photographing means, and the camera 12 with the lens 12a facing downward forms the second photographing means.

[0024] In this way, by having one camera 12 serve as both the first photographing means and the second photographing means, the housing 11 can be made smaller compared to the case of separately providing a camera with the lens facing horizontally and a camera with the lens facing downward. In addition, the camera 12 according to this embodiment can repeat photographing a plurality of times (for example, 14 times per second) in a short time. For this reason, the camera 12 according to this embodiment can photograph the falling first soil S 1 without omission. Also, the camera 12 according to this embodiment is configured to transmit the data of the image obtained by photographing to the measuring device 2 via the communication network N (wired or wireless).

[0025] The first lighting unit 14 is provided inside the housing 11 and emits light toward the first photographing means (rear). The first lighting unit 14 according to this embodiment is provided on the rear surface of the front part of the housing 11 so as to face the rear. Also, the first lighting unit 14 according to this embodiment emits white light. Also, the first lighting unit 14 according to this embodiment can also illuminate downward.

[0026] The second lighting unit 15 is provided inside the housing 11 and emits light toward the second photographing means (above). The second lighting unit 15 according to this embodiment is provided on the upper surface of the bottom of the housing 11 so as to face upward. In addition, the second lighting unit 15 according to this embodiment has the first soil S 1 or the second soil S 2 that can be placed thereon.

[0027] The tray 16 is provided in the housing 11 between the downward-facing camera 12 and the second lighting unit 15 (for example, placed on the upper surface of the second lighting unit 15), and receives the first soil S 1 that has fallen into the housing 11. The tray 16 is removable from the housing 11 and is removed when photographing the second soil S 2 placed on the second lighting unit 15 for measuring the particle size distribution.

[0028] Note that the photographing device 1 may separately include a camera serving as the first photographing means and a camera serving as the second photographing means. In addition, the photographing device 1 may include a mounting table for mounting the second soil S 2 separate from the second lighting unit 15.

[0029] (Measuring device) The measuring device 2 according to this embodiment is configured by a PC with a program installed therein. In addition, the measuring device 2 according to this embodiment is adapted to receive image data from the camera 12 via a communication network. Then, the measuring device 2 measures the particle size distribution of the first soil S 1 based on the image of the first soil S 1 obtained by the first photographing means, and measures the particle size distribution of the second soil S 2 based on the image of the second soil S 2 obtained by the second photographing means. The measuring device 2 according to this embodiment analyzes the images of the first and second soils S 2 to calculate the particle size distribution of the soil. For the analysis of an image for measuring the particle size distribution of this soil, for example, conventionally known methods such as those described in Non-Patent Document 1, Patent Documents 1 and 2 can be used.

[0030] In addition, the measuring device 2 according to the present embodiment measures the color of the first soil S obtained by the second photographing means, or the color of the second soil S 1 based on the image of, or the color of the second soil S 2 based on the image of the first soil S 1 or the color of the second soil S 2 as well. The measuring device 2 according to the present embodiment analyzes the images of the first and second soils S and calculates the chromaticity and chroma of the soil, respectively. 2 For the analysis of an image for measuring the chromaticity and chroma of this soil, various conventionally known methods can be used.

[0031] In addition, the measuring device 2 according to the present embodiment is configured to display the measurement results. Note that the measuring device 2 may be composed of a dedicated device. In addition, the measuring device 2 may be configured to notify the measurement results by a method other than display (for example, voice).

[0032] (Power supply device) The power supply device 3 supplies power to the first and second lighting units 14 and 15. Note that the power supply device 3 may be configured to supply power to at least one of the camera 12 and the measuring device 2.

[0033] (Modification) Note that in the system 100, at least two of the photographing device 1, the measuring device 2, and the power supply device 3 may be integrated. In addition, in the system 100, the measuring device 2 may be arranged at a location away from the installation location (construction site) of the photographing device 1. Further, the system 100 may be such that the camera 12 and the measuring device 2 do not have a communication function. Then, the camera 12 may write image data to a medium, and the measuring device 2 may read data from the medium. Further, the system 100 may be configured to receive power supply from a household power source or the like. In that case, the power supply device 3 is not necessary.

[0034] <2. Embankment Material Quality Management Method> Next, an embankment material quality management method (hereinafter referred to as the management method) using the above system 100 will be described. FIG. 4 is a schematic diagram for explaining a second method of preparing soil for measuring particle size distribution, FIG. 5 is a perspective view showing the inside of the imaging device 1 when the second soil for measuring particle size distribution is being imaged, and FIG. 6 is a perspective view showing the inside of the imaging device 1 when the first soil or the second soil for measuring color is being imaged.

[0035] The management method includes an installation process, a sample supply process, an imaging process, a measurement process, and a determination process. In addition, in the management method according to the present embodiment, the sample supply process, the imaging process, the measurement process, and the determination process are repeated periodically (for example, every few days).

[0036] (Installation Process) In the initial installation process, at least the imaging device 1 of the system 100 is installed at the embankment construction site. Since the imaging device 1 is of a portable size, it can be installed even at a construction site where it is difficult to install large-scale equipment. In addition, in the installation process, the measuring device 2 and the power supply device 3 are connected to the imaging device 1.

[0037] (Sample Supply Process and Imaging Process) After installing the imaging device 1, the process proceeds to the sample supply process and the imaging process. In this sample supply process, the content performed varies depending on the soil used as the material and the measurement content. For example, if the soil used as the material is the first soil S 1When the measurement content is the particle size distribution, the first illumination unit 14 is turned on, and the first sample S 1 extracted from the first soil S 1 is put into the opening 11a (the dispersion unit 13 above it). At this time, the position of the dispersion unit 13 in the front-rear direction is adjusted according to the apparent particle size of the sample and the degree of agglomeration. Then, the first sample S 1 falling in the housing 11 is photographed by the first photographing means (the camera 12 with the lens 12a directed horizontally). In the sample supply process according to this embodiment, the first sample S 1 is repeatedly photographed at high speed.

[0038] On the other hand, when the soil as the material is the second soil S 2 and the measurement content is the particle size distribution, the tray 16 is removed from the housing 11, the second illumination unit 15 is turned on, and the second sample S 2 extracted from the second soil S 2 is placed in the housing 11 (on the upper surface of the second illumination unit 15). In the sample supply process according to this embodiment, for example, as shown in Fig. 4(a), the second sample S 2 is put into a small dish D (for example, a petri dish) with at least the bottom being transparent, and then water W is put into the dish D to moisten the sample. Then, as shown in Fig. 4(b), since the fine components C of the second sample S 2 float on the water surface of the water W, the fine components C are removed. Then, as shown in Fig. 4(c), the water W is removed from the dish D. And, for example, as shown in Fig. 5, the second sample S 2 from which the fine components C have been removed is placed on the upper surface of the second illumination unit 15 while being in a dispersed state (a state where the contours of individual particles can be seen). At this time, the second sample S 2 may be placed directly on the second illumination unit 15, or may be placed together with the dish D. After that, the second sample S 2 placed in the housing 11 is photographed by the second photographing means (the camera 12 with the lens 12a directed downward).

[0039] Also, when the soil used as the material is the first soil S 1 or the second soil S 2 and the measurement content is color, the first lighting unit 14 is turned on, and the first soil S 1 or the second soil S 2 is spread over the entire upper surface of the second lighting unit 15 as shown in FIG. 6 (so that the upper surface of the second lighting unit 15 cannot be seen through the soil). At this time, the first sample S 1 or the second sample S 2 may be directly spread over the second lighting unit 15, or may be spread over a large dish (e.g., the receiving dish 16) placed on the second lighting unit 15. Thereafter, the first sample S 1 or the second sample S 2 placed in the housing 11 is photographed by the second photographing means. As described above, since the first lighting unit 14 also illuminates downward, the first soil S 1 or the second soil S 2 spread over the second lighting unit 15 is illuminated by the white light emitted by the first lighting unit 14.

[0040] (Measurement step) After photographing the soil, the process proceeds to the measurement step. In this measurement step, the measuring device 2 measures the particle size distribution of the first soil S 1 based on the image of the first sample S obtained in the photographing step, or measures the particle size distribution of the second soil S 1 based on the image of the second sample S 2 or measures the particle size distribution of the second soil S 2 based on the image of the second sample S. In the measurement step according to the present embodiment, after measuring the particle size distribution, the measuring device 2 displays the measurement result (a graph showing the particle size distribution (see FIGS. 7 and 8), the classification of the soil according to the particle size (coarse gravel, medium gravel, fine gravel, coarse sand, medium sand, fine sand, etc.), the difference from the previous measurement result, etc.).

[0041] Also, in the measurement step according to the present embodiment, the measuring device 2 measures the first soil S 1 obtained by the second photographing means, or the second soil S 2Based on the image of, the first soil S 1 color, or the second soil S 2 color is also measured. As described above, during shooting, the first soil S laid on the second lighting unit 15 1 or the second soil S 2 is illuminated by the white light emitted by the first lighting unit 14. The first sample S illuminated by this white light 1 or the second sample S 2 The color is measured using the image of the first sample S obtained by photographing 1 or the second sample S 2 image. By doing so, even if the first sample S 1 or the second sample S 2 is wet (even with a high water content ratio), measurement results similar to the dry state can be obtained. As a result, the process of drying the first sample S 1 or the second sample S 2 becomes unnecessary. After measuring the color, the measuring device 2 displays the measurement results (a graph showing the color (see Fig. 9), the classification of the soil according to the color (gravelly soil, sandy soil, clayey soil, etc.), the difference from the previous measurement results, etc.).

[0042] (Judgment step) After measuring the particle size distribution and color of the soil, it moves to the judgment step. In this judgment step, based on the particle size distribution obtained in the measurement step, the first soil S 1 , or the second soil S 2 is judged whether it is suitable for construction. Also, in the judgment step according to this embodiment, based on the particle size distribution and color obtained in the measurement step, the first soil S 1 , or the second soil S 2 is judged whether it is suitable for construction. The judgment as to whether the soil is suitable for construction is made, for example, by whether the differences between the particle size distribution, chromaticity, and colorfulness of the soil obtained this time and the initial particle size distribution, chromaticity, and colorfulness of the soil obtained by the test at the beginning of construction are within a predetermined range respectively. Note that this judgment may be made by the measuring device 2 or by a person who has seen the measurement results.

[0043] In this determination step, if it is determined that the first soil S 1 , or the second soil S 2 is not suitable for construction, for example, the soil is returned to its original location. On the other hand, in this determination step, if it is determined that the first soil S 1 , or the second soil S 2 is suitable for construction, it is transported to the embankment under construction.

[0044] (Modification example) In addition, when the soil to be measured is a soil for which it is difficult to draw a line to indicate whether it is the first soil S 1 or the second soil S 2 , for example, it is put into the opening 11a in the same manner as the first soil and measured based on the particle size distribution measured based on the image captured by the first imaging means, and the particle size distribution measured based on the image captured by the second imaging means after being placed in the housing 11 in the same manner as the second soil. The properties of the soil may be determined based on both.

[0045] <3. Effect> The system 100 described above includes a portable housing 11 having an opening 11a on its upper surface, and a first soil S with relatively large particle size that is dropped into the housing 11 from the opening 11a 1 (gravelly soil), a first imaging means (camera 12 with the lens 12a facing horizontally) for imaging, and a second soil S with relatively small particle size placed in the housing 11 2 (sandy soil), a second imaging means (camera 12 with the lens 12a facing downward) for imaging, an imaging device 1 including the above, and a first soil S obtained by the first imaging means 1 Based on the image of, the particle size distribution of the first soil S 1 is measured, and based on the image of the second soil S obtained by the second imaging means 2 , the particle size distribution of the second soil S 2 is measured, and a measuring device 2 is provided. In addition, the embankment material quality management method described above includes an installation step of installing the system 100 at the construction site of the embankment, and when the soil used as the material is the first soil S 1In the case where it is, the first soil S 1 The first sample S extracted from 1 is put into the opening 11a, and when the soil to be used as the material is the second soil S 2 In the case where it is, the second soil S 2 The second sample S extracted from 2 A sample supply step of placing it in the housing 11, and the first sample S falling in the housing 11 by the first imaging means 1 is imaged, or the second sample S placed in the housing 11 by the second imaging means 2 is imaged, a measurement step in which the measuring device 2 measures the particle size distribution of the first soil S 1 based on the image of, or measures the particle size distribution of the second soil S 1 based on the image of the second sample S 2 and a determination step of determining whether the first soil S 2 or the second soil S 1 is suitable for construction based on the particle size distribution obtained in the measurement step. 2 It has.

[0046] At least the imaging device 1 and the measuring device 2 are portable (small and lightweight), and since the measurement is performed using a sample extracted from the soil to be used as the material, it is difficult to install large-scale equipment. It can be easily installed even at the embankment construction site. In addition, by installing this system 100 at the construction site, the particle size distribution of the transported soil can be measured immediately. Therefore, according to this system 100 or the embankment material quality control method using this system 100, at the embankment construction site, the particle size distribution of the soil used as the material can be measured easily and quickly.

[0047] Also, in the system 100 according to this embodiment, the measuring device 2 is based on the image of the first soil S 1 obtained by the second imaging means, or the image of the second soil S 2 Based on, the color of the first soil S 1 or the color of the second soil S 2 is also measured. In addition, in the method for controlling the quality of the banking material according to the present embodiment, in the measurement step, the measurement device 2 photographs the first soil S obtained by the second photographing means. 1 , or the second soil S 2 Based on the image of the first Sat. 1 Color of the second soil S 2 The color of the first soil S is also measured, and in the judgment step, the first soil S is determined based on the particle size distribution and color obtained in the measurement step. 1 , or the second soil S 2 Determine whether it is suitable for construction.

[0048] Conventional soil quality control methods using image analysis only measure the particle size distribution of the soil. Therefore, even if the color of the soil delivered at a later date is different from that of the original construction, if the particle size distribution remains the same, the properties of the soil delivered at a later date may be judged to be the same as that of the original construction. However, according to this system 100 or the method for controlling the quality of fill material using this system 100, for example, even if the particle size distribution of soil brought in at a later date is the same as that at the time of construction, if the color has changed, it can be determined that the properties of the soil brought in at a later date have changed from those at the time of construction, and changes in soil properties that might have been overlooked in the past can be more reliably detected. EXAMPLES

[0049] Next, an embodiment of the present invention will be described. FIG. 7 shows the first sample S obtained by the grain size test. 1 Graph showing particle size distribution of the first sample S obtained by the system 100. 1 FIG. 8 is a graph showing the particle size distribution of the second sample S obtained by the particle size test. 2 Graph showing particle size distribution of the second sample S obtained by the system 100. 2 FIG. 9 is a graph showing the particle size distribution of the first to third samples obtained by the system 100.

[0050] <Test Overview> First, a first sample S within the range of 4 to 6 kg 1 (gravelly soil) was prepared. Then, using the first sample S 1 , a particle size test (JIS A 1204) was conducted. Also, using the above system 100, the particle size distribution of this first sample S 1 was measured. And the particle size distribution of the first sample S obtained by the particle size test 1 and the particle size distribution of the first sample S obtained by the system 100 1 were graphed on the same plane.

[0051] Next, a second sample S within the range of 1 to 2 kg 2 (sandy soil) was prepared. Then, using the second sample S 2 , the same particle size test as the first sample S 1 was conducted. Also, using the above system 100, the particle size distribution of this second sample S 2 was measured. And the particle size distribution of the second sample S obtained by the particle size test 2 and the particle size distribution of the second sample S obtained by the system 100 2 were graphed on the same plane with the particle diameter on the horizontal axis and the passing mass percentage on the vertical axis.

[0052] Also, eight types of first samples S with different water contents each 1 (gravelly soil), four types of second samples S with different water contents each 2 (sandy soil), and four types of third samples (clayey soil) with different water contents each were prepared. Then, using the system 100, the chromaticity and chroma of each sample were measured respectively. Finally, the colors of the measured samples were plotted on a plane with chromaticity on the horizontal axis and chroma on the vertical axis.

[0053] <Results of the test> Graph G showing the particle size distribution of the first sample S obtained by the system 100 1 11with the first sample S obtained by the particle size test 1 and the graph G showing the particle size distribution 12 As a result of comparison, as shown in Fig. 7, both graphs G 11 ,G 12 were generally in agreement. Next, the graph G 2 showing the particle size distribution of the second sample S obtained by the system 100 21 was compared with the graph G 2 showing the particle size distribution of the second sample S obtained by the particle size test 22 As a result, as shown in Fig. 8, both graphs G 21 ,G 22 were generally in agreement with the first sample S 1 in the same manner. This indicates that the system 100 can measure the particle size distribution with the same accuracy as the conventional particle size test.

[0054] In addition, as a result of comparing the positions of the points P 1 ,P 2 ,P 3 indicating the chromaticity and chroma of each sample, as shown in Fig. 9, the points P 1 ,P 2 ,P 3 indicating the same type of sample were concentrated (the chromaticity and chroma were generally in agreement) even though the water content ratios were different. This indicates that the system 100 can accurately discriminate the type of soil without drying the sample before measuring the color.

Explanation of Signs

[0055] 100 Embankment material quality management system 1 Imaging device 11 Housing 11a Opening 11b Second opening 11c Camera support part 11d Shaft rod 12 Camera (first imaging means, second imaging means) 12a Lens 13 Dispersion part 13a Inclined surface 13b Protrusion 13c Hopper 14 First lighting unit 15 Second lighting unit 16 Tray 2 Measuring device 3 Power supply device D Dish G 11 Graph showing the particle size distribution of the first soil (sample) obtained by the embankment material quality management system G 12 Graph showing the particle size distribution of the first soil (sample) obtained by the particle size test G 21 Graph showing the particle size distribution of the second soil (sample) obtained by the embankment material quality management system G 22 Graph showing the particle size distribution of the second soil (sample) obtained by the particle size test N Communication network P 1 Point showing the chromaticity and chroma of the first soil (sample) P 2 Point showing the chromaticity and chroma of the second soil (sample) P 3 Point showing the chromaticity and chroma of the third soil (sample) S 1 First soil (sample) S 2 Second soil (sample) C Fine component W Water

Claims

1. A portable housing having an opening on the upper surface, First imaging means provided on the housing for imaging first soil having a relatively large particle size that is dropped into the housing through the opening and is falling inside the housing; Second imaging means provided on the housing for imaging second soil having a relatively small particle size placed inside the housing or the first soil; An imaging device comprising: A measuring device that measures the particle size distribution of the first soil based on an image of the first soil obtained by the first imaging means and measures the particle size distribution of the second soil based on an image of the second soil obtained by the second imaging means; An embankment material quality management system, characterized by comprising the above.

2. The housing is provided with a camera that can be switched between a state where the lens is directed horizontally and a state where the lens is directed downward, The embankment material quality management system according to claim 1, wherein the camera with the lens directed horizontally forms the first imaging means, and the camera with the lens directed downward forms the second imaging means.

3. The measuring device measures the color of the first soil or the color of the second soil based on an image of the first soil or an image of the second soil obtained by the second imaging means. The embankment material quality management system according to claim 1 or claim 2, characterized by this.

4. An inclined surface provided above the opening and inclined so as to slope downward in a direction away from the first imaging means, and at least one protrusion provided on the inclined surface for dispersing the first soil sliding down on the inclined surface in a direction perpendicular to the falling direction along the inclined surface. The embankment material quality management system according to any one of claims 1 to 3, characterized by comprising a dispersion part having the above.

5. An installation step of installing an imaging device comprising a portable housing having an opening on the upper surface, first imaging means for imaging first soil having a relatively large particle size that is dropped into the housing through the opening and is falling inside the housing, and second imaging means for imaging second soil having a relatively small particle size placed inside the housing at the embankment construction site; A sample supply step of throwing a first sample taken from the first soil into the opening when the soil as the material is the first soil, and placing a second sample taken from the second soil inside the housing when the soil as the material is the second soil; A photographing step of photographing the first sample falling inside the housing by the first photographing means or photographing the second sample placed inside the housing by the second photographing means; A measuring device that measures the particle size distribution of the first soil based on the image of the first soil obtained by the first photographing means and measures the particle size distribution of the second soil based on the image of the second soil obtained by the second photographing means measures the particle size distribution of the first soil based on the image of the first sample obtained in the photographing step, or measures the particle size distribution of the second soil based on the image of the second sample; a measuring step; A determination step of determining whether the first soil or the second soil is suitable for construction based on the particle size distribution obtained in the measurement step; A method for managing the quality of embankment materials, characterized by comprising the above.

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