JP6764755B2 - Soil quality judgment method and system - Google Patents

Description

The present invention relates to a soil quality determination method and system, and particularly to a method and system for determining soil quality of soil containing cohesive soil.

Conventionally, when constructing civil engineering structures such as embankments and embankments using soil materials such as gravel, sand, and clay that have not been sorted in advance (hereinafter referred to as soil), the quality of the soil brought into the site (hereinafter referred to as soil). (Hereinafter referred to as soil quality) is appropriately judged, and the soil brought in is reformed and managed according to the required soil quality. For example, as shown in FIG. 5, in the CSG method or the like in which a soil modifier (for example, water or cement) is mixed with soil S collected at a collection site (for example, a ground) 1 near the site and used as a material for a civil engineering structure. , Large rocks, etc. may be crushed by the crusher 1a, but basically the collected soil S is constructed as it is without sorting. Therefore, from the viewpoint of ensuring the quality of civil engineering structures, the soil S collected at the collection site 1 and brought to the site via the stockyard 2 is appropriately extracted, the soil quality of the soil S is judged, and necessary modifications are made. Is required.

The soil quality of soil S is generally determined by the diameter distribution (particle size distribution) and water content ratio (moisture content) of the soil particles contained therein. In FIG. 5, the image G of the soil S extracted as appropriate is photographed by the imaging device 5 to obtain the particle size distribution, and the soil quality is determined by obtaining the water content ratio of the soil S by the moisture meter 7. Further, based on the determination result, the addition amount of the soil modifier (for example, water or cement) to be mixed with the soil S is adjusted in the addition device 8, and the soil S and the modifier are mixed in the mixing device 9. The soil S supplied to the site is reformed and managed so that it has the required soil quality. In the figure, reference numeral 3 indicates a transport machine such as a truck, and reference numeral 4 indicates an on-site receiving hopper.

The basic method for determining the particle size distribution (particle size addition curve) of soil S is sieving (see Non-Patent Document 1), but since it takes time and effort, the soil S is sprinkled out as shown in FIG. A technique has been developed in which an image G is photographed according to No. 5 and a particle size distribution curve is created from the image G by a computer (image analysis program) (see Patent Documents 1 to 3). By using such an image analysis technique, the particle size distribution of the soil S brought into the site can be determined at a frequency of about once every 15 to 30 minutes. Further, a technique has been developed in which the soil S is vibrated and sprinkled (dispersed) on a belt conveyor that conveys the soil S (see Patent Document 4), and the time for sprinkling using such a vibrating belt conveyor is shortened or omitted. Therefore, it is possible to determine the fluctuation of the particle size distribution of the soil S to be carried in almost continuously.

The basic method for determining the water content (moisture content) of soil S is the microwave oven method or the frying pan method (see Non-Patent Documents 2 and 3), but it also takes 30 minutes or more to measure, so it is close. A technique for continuously measuring the water content of soil S using infrared light has been developed (see Patent Documents 5 and 6). Therefore, by applying such a technique for measuring the water content ratio by near-infrared light and the technique for measuring the particle size distribution by the above-mentioned image analysis, the soil quality (particle size distribution) while transporting the soil S carried into the site by a vibrating belt conveyor. And the water content ratio) is continuously determined, and the soil S is subjected to necessary modification based on the determination result to supply the soil S to the site so that the required soil quality is always satisfied. Can be expected.

Japanese Unexamined Patent Publication No. 2010-249553 Japanese Unexamined Patent Publication No. 2011-163836 Japanese Unexamined Patent Publication No. 2013-257188 JP-A-2016-124665 Japanese Unexamined Patent Publication No. 2015-028446 JP-A-2015-105988

Japanese Industrial Standard "Soil Particle Size Test Method" JIS-A1204 Japanese Geotechnical Society "Methods and Explanations of Ground Material Testing", Maruzen Publishing Co., Ltd., November 2009, pp. 104-105 Japanese Geotechnical Society "Methods and Explanations of Ground Material Testing", Maruzen Publishing Co., Ltd., November 2009, pp. 106-107 Kajima Corporation Press Release "Development of" Mud DRY ", a sorting aid that quickly smoothes viscous soil," published on July 14, 2015, on the Internet (URL: http: //www.kajima.co.jp /News/press/201507/14c1-j.html)

However, the above-mentioned conventional soil quality determination method has a problem that the soil quality of soil containing cohesive soil cannot be appropriately determined. That is, the soil quality judgment of the carried-in soil in the above-mentioned CSG method is, for example, the soil collected at a single collection site near the site, and usually the target is gravel soil and sandy soil, and cohesive soil is used. It did not contain much, and the range of soil quality (viscosity, water content, etc.) was within the range that could be assumed in advance. On the other hand, for example, in the construction (landfill) of an interim storage facility for radioactively contaminated soil generated by the accident at a nuclear power plant, it is necessary to accept and reclaim the removed soil generated by decontamination treatment in a wide area. Since the soil removed from the forest is also targeted, soil that may contain a large amount of cohesive soil and that has significantly different soil qualities (viscosity, water content, etc.) is targeted.

In the construction work of the interim storage facility, the soil is brought in in a state of being mixed with organic matter (grass, trees, roots, etc.), and if it is buried as it is, the surface of the landfill soil will sink due to the decay of the organic matter, or the landfill soil will become anaerobic. Since hydrogen sulfide gas may be generated inside, it is necessary to sort organic matter from the soil before landfill. On the other hand, soil containing a large amount of cohesive soil carried into the interim storage facility cannot be efficiently sorted from organic matter even if it is put into a sorting device. Therefore, the soil is reformed to the extent that efficient sorting is possible before organic matter is selected. It is necessary to sort (see Non-Patent Document 4). It is irrational and uneconomical to uniformly modify all the soil brought into the interim storage facility, and the allowable amount of acceptance is limited. Therefore, in order to properly construct the interim storage facility, It is important to determine whether or not reform is necessary based on the soil quality of the imported soil, and if so, what kind of reform is necessary.

The present inventor determined the soil quality (grain size distribution and water content ratio) of the soil containing cohesive soil by using the particle size distribution measurement by conventional image analysis and the water content ratio measurement by near infrared light. When the water content ratio is high, it tends to become a soil mass (aggregate), and it becomes difficult to accurately measure the diameter of soil particles (hereinafter, simply referred to as particles), and the soil becomes a soil mass (soil that needs to be reformed). It was also experienced that erroneous judgment was made as gravel soil with a large particle size (soil that does not require modification). In addition, even cohesive soil that has become a mass of soil has a different hardness (degree of solidification), and is relatively loosely solidified cohesive soil (soil that requires normal reforming) and hard solidified viscosity. It has also been experienced that soil (soil that requires a high degree of reforming) cannot be properly distinguished from the particle size distribution and water content ratio. In order to properly judge the soil quality of soil containing cohesive soil, it is not enough to judge the soil quality based on the particle size distribution and water content ratio as in the past, but it is necessary to judge the soil quality considering the presence or absence of soil mass and the hardness of the soil mass. is necessary.

Therefore, an object of the present invention is to provide a method and a system capable of determining the soil quality of soil containing cohesive soil that can become a soil mass (aggregate).

With reference to the embodiment of FIG. 1 and the flow chart of FIG. 2, the soil quality determination method according to the present invention applies vibration to the soil S (see step S05 of FIG. 2), and images Ga of the soil S before and after the vibration. Gb was photographed, and the distributions Pa and Pb of the diameters of the particles and the soil mass were measured from the images Ga and Gb before and after the vibration, respectively (see steps S04 and S06 in FIG. 2). The soil quality of the soil S is determined from the change V of Pb.

Further, referring to the embodiment of FIG. 1, the soil quality determination system according to the present invention transports the soil S and provides a vibration area in the intermediate portion 20 in the belt conveyor 10, the upstream portion 19a and the downstream portion 19b of the belt conveyor 10. Distribution of particles and soil mass diameters by photographing images Ga and Gb of soil S being transported, respectively. Distribution of particle and soil mass diameters in measuring means 43 and 44 for measuring Pa and Pb, and upstream portion 19a and downstream portion 19b. It is provided with a determination means 47 for determining the soil quality of the soil S from the change V of Pa and Pb.

In a preferred embodiment, as shown in FIG. 4, the belt conveyor 10 has a first support 21 that supports the carrier roller 15 of the intermediate portion 20, and an upstream portion 19a of the intermediate portion 20 that is cut off from the first support 21. A second support 25 that supports the carrier roller 16 of the downstream portion 19b, and a vibrating device 22 that vibrates the first support 21 are included.

In a desirable embodiment, as shown in the determination means 47 of FIG. 1, the distribution Pb of the diameters of the particles and the soil mass in the downstream portion 19b and the distributions Pa and Pb of the diameters of the particles and the soil mass in the upstream portion 19a and the downstream portion 19b V. The soil quality of the soil S is determined from the above. In a more desirable embodiment, as shown in FIG. 1, moisture meters 7a and 7b for measuring the water content ratios Wa and Wb of the soil S are provided in at least one of the front and rear of the vibration area 20, and the determination means 47 provides the downstream portion 19b. The soil quality of the soil S is determined from the distribution Pb of the diameters of the particles and the soil mass and the changes V of the diameter distributions Pa and Pb of the particles and the soil mass in the upstream portion 19a and the downstream portion 19b and the water content ratios Wa and Wb.

In the soil quality determination method and system according to the present invention, vibration is applied to the soil S, images Ga and Gb of the soil S are taken before and after the vibration, and the diameter distribution of particles and soil mass is distributed from the images Ga and Gb before and after the vibration, respectively. Pa and Pb are measured, and the soil quality of the soil S is determined from the change V of the diameter distribution Pa and Pb of the particles and the soil mass before and after the vibration, and the following effects are obtained. In the following description, the diameter distributions Pa and Pb of particles and soil mass may be simply referred to as particle size distributions Pa and Pb.

(B) If there is a change V in the particle size distribution Pa and Pb before and after the vibration of the soil S, it contains a lot of cohesive soil that has become a soil mass (aggregate), and if there is no change V, it is a sandy soil that is unlikely to become a soil mass. , It can be judged that a large amount of gravel soil, low water content cohesive soil, muddy cohesive soil, or cohesive soil forming a mass is contained.
(B) By considering the water content ratios Wa and Wb of the soil S before and after the vibration of the soil S, it is possible to distinguish between the soil with a large amount of sandy soil, the soil with a large amount of gravel soil, and the cohesive soil with a low water content. Can be done.
(C) If the particle size distributions Pa and Pb of the soil S before and after the vibration do not change, the water content ratios Wa and Wb of the soil S before and after the vibration are taken into consideration to obtain sandy soil and gravel. It is possible to distinguish between soil, low water content cohesive soil, muddy cohesive soil, and cohesive soil that is a mass of soil.

(D) Furthermore, by considering the change V of the particle size distributions Pa and Pb before and after the vibration and the particle size distribution Pb and the water content ratios Wa and Wb after the vibration, even if the soil is cohesive, it is relatively gentle. It is also possible to distinguish between solidified cohesive soil, muddy cohesive soil, and hard solidified cohesive soil.
(E) By measuring the particle size distribution Pa, Pb and the water content ratios Wa, Wb before and after vibration while transporting by a vibrating belt conveyor, even if the soil S carried into the site contains a large amount of cohesive soil, it is viscous. The soil quality of soil S can be continuously determined, including the degree of soil solidification.
(F) Further, on the downstream side of the belt conveyor 10, a modifier adding device 8c to 8f for adding an amount of soil modifier corresponding to the soil quality determination result to the soil S is provided for the soil S carried into the site. By performing the necessary reforming, even if the soil S contains a large amount of cohesive soil, the soil S that satisfies the required soil quality can be supplied to the site.

Hereinafter, embodiments and examples for carrying out the present invention will be described with reference to the accompanying drawings.
Is a block diagram of an embodiment of the soil quality determination system of the present invention. Is an example of a flow chart showing the soil quality determination method of the present invention. Is an explanatory diagram showing an example of a change in particle size distribution (distribution of diameters of particles and soil mass) before and after vibration of soil in the present invention. Is an explanatory view of an embodiment of the vibrating belt conveyor used in the present invention. Is an explanatory diagram of the conventional soil quality determination and reforming method.

FIG. 1 shows an example in which the soil quality determination system of the present invention is applied to the construction site of an interim storage facility where the removed soil generated in the decontamination treatment after the nuclear power plant accident is received from a wide area and buried. Similar to the construction site of the CSG method described with reference to FIG. 5, the soil S carried into the site is first put into the raw soil hopper 4 and then transferred from the hopper 4 to the mixing device 9 (mixer or the like) for reforming. It is transported, mixed with a soil modifier, passed through a sorting device for organic matter (not shown), and then used for landfill. The soil quality determination system of the illustrated example continuously determines the soil quality while transporting the soil S from the hopper 4 to the mixing device 9.

In the soil quality determination system of the illustrated example, the soil S is conveyed and the belt conveyor (vibration belt conveyor) 10 having a vibration area in the intermediate portion 20 is being conveyed, and the upstream portion 19a and the downstream portion 19b of the belt conveyor 10 are being conveyed, respectively. It has image pickup devices 5a and 5b such as a digital camera for capturing images Ga and Gb of soil S. In addition, the images Ga and Gb are input to measure the particle size distributions Pa and Pb of the upstream portion 19a and the downstream portion 19b before and after the vibration, and the soil quality of the soil S is determined from the change V of the particle size distributions Pa and Pb before and after the vibration. It has a computer 40 for determining.

FIG. 4A shows an enlarged view of an example of the belt conveyor 10 suitable for the present invention. The belt conveyor 10 in the illustrated example has an annular belt 14 bridged between the drive pulley 11 and the tail pulley 13 in the same manner as a normal belt conveyor. The drive pulley 11 is driven by the drive device 12, and the belt 14 is rotated between the drive pulley 11 and the tail pulley 13 to convey the soil S placed on the mounting surface of the belt 14. Reference numeral 17 in FIG. 4 indicates a snap pulley for adjusting the tension by changing the angle of the belt 14 wound around the drive pulley 11.

A plurality of carrier rollers 15 and 16 are arranged along the transport direction below the mounting surface of the belt conveyor 10 in FIG. 4A, and the carrier roller 15 in the intermediate portion 20 of the mounting surface is the first. The carrier rollers 16 on the upstream portion 19a and the downstream portion 19b of the mounting surface are connected and supported by the support 21, and are connected and supported by the second support 25 cut off from the first support 21. The first support 21 and the second support 25 are each supported on the base of the construction site by the support legs.

In the belt conveyor 10 of FIG. 4A, the load on the mounting surface is supported by the first support 21 and the second support 25 via the carrier rollers 15 and 16, but both supports 21 and 25 are mutually supported. Since the edges are cut off, only the load of the carrier roller 15 is transmitted to the first support base 21, and the load of the other carrier rollers 16 is not transmitted. Further, the belt conveyor 10 has a vibrating device 22 that vibrates the first support 21, but since the first support 21 and the second support 25 are mutually cut off, the vibrating device 22 vibrates. Is not transmitted to the second support 25, and vibrates only the first support 21 and the carrier roller 15 connected to the first support 21.

The vibration device 22 in the illustrated example is connected to the computer 40 via a vibration control device 31, and the vibration condition (for example, frequency, amplitude, vibration output, etc.) of the vibration device 22 is appropriately switched by the computer 40 as needed. be able to. That is, in the belt conveyor 10 of FIG. 4A, the first vibration device 22 is vibrated without vibrating the upstream portion 19a and the downstream portion 19b of the mounting surface supported by the second support 25. Only the intermediate portion 20 of the mounting surface supported by the support 21 can be vibrated, and the mounting surface can be divided into a vibration-free area, a vibration area, and three parts along the transport direction.

The imaging devices 5a and 5b of the illustrated example are arranged in vibration-free areas of the upstream portion 19a and the downstream portion 19b of the belt conveyor 10, respectively. If the image G is photographed while the soil S is vibrated, the particles and the soil mass in the soil S are reflected as different shapes each time the image G is photographed, and the accuracy of the particle size distribution measured from the image G may decrease. As shown in FIG. 4A, the soil S is vibrated and dispersed in the vibrating area, and the images Ga and Gb are photographed without vibrating in the non-vibrating areas before and after the soil S, whereby the particle size distribution is distributed from the images Ga and Gb. Can be measured accurately. It is also possible to temporarily stop the transportation of the belt conveyor 10 in the vibration-free area. Further, the length of the intermediate portion 20 (length in the transport direction), which is the vibration area, can be appropriately selected so that the soil S can be sufficiently dispersed.

The soil S mounted on the belt conveyor 10 advances below the image pickup devices 5a and 5b while being conveyed, and the pre-vibration image Ga and the post-vibration image Gb are continuously photographed by the image pickup devices 5a and 5b. In the illustrated example, the photographing buildings 6a and 6b covered with the light-shielding plate and the light-shielding curtain are provided on the upstream portion 19a and the downstream portion 19b of the belt conveyor 10, respectively, and a lighting device (not shown) is provided in the photographing buildings 6a and 6b. ), And the soil S that has entered the inside of the photographing buildings 6a and 6b is maintained at a predetermined illuminance and photographed by the imaging devices 5a and 5b. However, the photographing building 6 and the lighting device are not essential to the present invention and can be omitted.

The computer 40 of the illustrated example has input means 41 for inputting images Ga and Gb as built-in programs, and measuring means 43 and 44 for measuring particle size distributions Pa and Pb from the images Ga and Gb before and after vibration of soil S. An example of the particle size distribution measuring means 43 and 44 is a conventional image analysis program that measures the distribution of the diameters (particle size distribution) of the particles contained therein from the image G of the soil S and creates a particle size product curve image G. However, not only the diameter of the particles but also the diameter of the soil mass (aggregate) in which the particles are aggregated is measured, and the particle size distribution (distribution of the diameters of the particles and the soil mass) is measured.

Further, the computer 40 of the illustrated example is a particle size distribution change detecting means 45 for detecting the change V of the particle size distribution Pa and Pb before and after the vibration, and a determining means for determining the soil quality of the soil S based on the change V of the particle size distribution Pa and Pb. It has 47 and. The determination means 47 can determine the soil quality of the soil S based not only on the change V of the particle size distributions Pa and Pb before and after the vibration but also on the particle size distribution Pb of the upstream portion 19a or the downstream portion 19b together with the change V. If particles and soil lumps with a diameter smaller than the specified diameter are allowed to be buried as they are without modification in the interim storage facility, the particle size distributions Pa and Pb with a predetermined diameter or more can be measured with the measuring means 43 and 44. Sufficient.

Further, the soil quality determination system of the illustrated example has moisture meters 7a and 7b for measuring the water content ratios Wa and Wb of the soil S before and after the vibration area 20 of the belt conveyor 10, and measures the measured values of the moisture meters 7a and 7b. Input to computer 40. An example of the moisture meter 7 irradiates the soil S with near-infrared light in a predetermined wavelength range (for example, 0.7 μm to 2.5 μm), and the reflected light or transmitted light has a specific wavelength λi (for example, 1.2 μm, 1. The water content (moisture content ratio) of the soil S is calculated from the attenuation at 45 μm, 1.94 μm, etc.).

The computer 40 of the illustrated example has, as a built-in program, a water content ratio measuring means 46 for calculating the water content (water content ratio) of the soil S from the measured values of the moisture meters 7a and 7b, and the vibration of the soil S in the determining means 47. The soil quality of soil S is determined from the changes V of the particle size distributions Pa and Pb before and after and the water content ratio b of soil S. For example, the reflected light or transmitted light of the near infrared light irradiated to the soil S is measured by the moisture meters 7a and 7b, and the measured value is input to the water content ratio measuring means 46 of the computer 40 to attenuate the soil at a specific wavelength λi. The water content (water content ratio) of S is calculated. If the water content ratio W of the soil S does not change before and after the vibration, it is sufficient to provide a moisture meter 7a or 7b at least one of the front and rear of the vibration area 20.

In the illustrated example, the soil S of the hopper 4 is not directly charged to the belt conveyor 10, but a carry-in belt conveyor 26 is provided on the upstream side of the belt conveyor 10, and the carry-in belt conveyor 26 contains water in the soil S before vibration. A moisture meter 7a for measuring the ratio Wa is provided. Then, a sorting device 36 is provided between the carry-in belt conveyor 26 and the belt conveyor 10, and based on the water content ratio Wa of the soil S measured by the moisture meter 7a, the soil S that requires reforming and the soil S that does not require reforming Is identified, and only the soil S that requires reforming is guided to the belt conveyor 10 by the sorting device 36, and the soil S that does not require reforming is guided to the carry-out belt conveyor 27. However, the installation position of the moisture meter 7a is not limited to the illustrated example, and when sorting on the upstream side of the belt conveyor 10 is not required, the carry-in belt conveyor 26 and the sorting device 36 are omitted, and the belt conveyor 10 is omitted. A moisture meter 7a can also be installed in the upstream portion 19a of the above.

Further, in the illustrated example, the soil S discharged from the belt conveyor 10 is not directly carried to the site, but a sorting device 37 and a modifier adding device 8c to 8f are provided on the downstream side of the belt conveyor 10 and are operated by a computer 40. The degree of necessity of reforming the soil S is identified based on the soil quality determination result, and the soil S discharged from the belt conveyor 10 by the sorting device 37 is guided to any of the reforming material adding devices 8c to 8f. The sorting devices 36 and 37 can be controlled by a signal from the output means 48 connected to the determination means 47 of the computer 40, and the computer 40 continuously determines the soil quality of the soil S and uses the soil quality determination result as the result. The corresponding reforming treatment can be continuously applied to the soil S. For example, in the modifier adding devices 8c to 8f, an amount of soil modifier corresponding to the soil quality determination result is put into the soil S, and in the mixing devices 9c to 9f, the soil S and the modifier are mixed to form the soil S. Can be delivered to the site after adjusting the soil quality to the required one at all times.

FIG. 2 shows an example of a flow chart of a soil quality determination method for soil S using the system of FIG. Hereinafter, the soil quality determination method of the present invention will be described with reference to the flow chart of FIG. First, in step S01, the soil S is carried from the hopper 4 to the carry-in belt conveyor 26. Next, in step S02, the water content ratio (moisture content before vibration) Wa is measured by the moisture meter 7a on the carry-in belt conveyor 26, the measured value is input to the computer 40, and the water content ratio Wa of the soil S by the water content ratio measuring means 46 is obtained. Based on this, the soil quality is determined by the determination means 47. Specifically, when the water content ratio Wa is low (for example, less than 40%), it is determined that the soil S is soil Sa (sandy soil, gravel soil, or low water content cohesive soil) that is unlikely to form a soil mass.

In step S03 of FIG. 2, the soil quality determination result of the determination means 47 is output to the sorting device 36 via the output means 48, and the soil Sa that is unlikely to become a soil mass is separated by the sorting device 36 into the carry-out belt conveyor 27, and the soil Sb that easily becomes a soil mass ~ Sf is guided to the belt conveyor 10. Next, in step S04, the pre-vibration image Ga is taken by the image pickup device 5a of the upstream portion 19a of the belt conveyor 10, and in step S05, the soil S is vibrated by the intermediate portion 20 of the belt conveyor 10 under the required vibration conditions, and then in step S06. The image Ga after vibration is photographed by the image pickup device 5b at the downstream portion 19b of the belt conveyor 10. If necessary, in step S07, the water content ratio (pre-vibration water content ratio) Wb of the soil S after vibration may be measured by a moisture meter 7b installed in the downstream portion 19b of the belt conveyor 10.

The images Ga and Gb captured by the image pickup devices 5a and 5b are input to the computer 40, and the pre-vibration particle size distribution Pa and the post-vibration particle size distribution Pb of the soil S are obtained from the pre-vibration image Ga and the post-vibration image Gb by the measuring means 43 and 44, respectively. Is measured, and the change V of the particle size distributions Pa and Pb before and after the vibration is detected by the particle size distribution change detecting means 45. The change V of the particle size distributions Pa and Pb is input to the determination means 47, and the determination means 47 measures the change V of the particle size distributions Pa and Pb before and after the vibration, the particle size distribution Pb after the vibration, and step S02 (or step S06). The soil quality of the soil S is determined based on the water content ratio Wa (or Wb).

In step S08 of FIG. 2, when the change V of the particle size distributions Pa and Pb before and after the vibration was detected by the determination means 47 of the computer 40 as shown in FIG. 3 (A), it became a soil mass in the soil S. Although cohesive soil is contained, a large soil mass collapsed due to vibration, indicating that the soil Sb does not require reforming. The soil quality determination result of the determination means 47 is output to the sorting device 37 via the output means 48, and the cohesive soil Sb containing cohesive soil but not requiring modification is sorted by the sorting device 37 to the carry-out belt conveyor 27.

In steps S09 to S12 of FIG. 2, when the change V of the particle size distributions Pa and Pb before and after the vibration is not detected by the determination means 47 of the computer 40, the cohesive soil and the low viscosity soil which became a highly viscous soil mass in the soil S It is shown that the soil is Sc to Sf containing the cohesive soil that needs to be reformed because the soil mass is not collapsed or originally formed as a soil mass even by vibration. .. For such cohesive soils Sc to Sf, the soil quality can be further finely determined based on the particle size distribution Pb after vibration and the water content ratio Wa, and the required reforming treatment can be separated.

That is, in step S09 of FIG. 2, as shown in FIG. 3 (B), the particle size of the cohesive soil forming the soil mass is relatively small (for example, the average value of the particle size is less than 20 mm), and the water content ratio is medium (for example, For example, when it is less than 40 to 55%), it is shown that the determination means 47 of the computer 40 determines that the soil Sc is a soil mass but has a relatively low viscosity. Such soil Sc often does not require reforming, but the soil quality determination result of the determination means 47 is output to the sorting device 37 via the output means 48, and the cohesive soil Sc is added to the modifier addition device by the sorting device 37. Leading to 8c, in the modifier adding device 8c, the amount of soil modifier corresponding to the soil quality judgment result is put into the soil S, and in the mixing device 9c, the soil S and the modifier are mixed to reform. Can be done.

In step S10 of FIG. 2, as shown in FIG. 3 (C), the particle size of the cohesive soil forming the soil mass is relatively large (for example, the average value of the particle size is 20 mm or more), and the water content ratio is high (for example, 55%). In the case of less than), it is shown that the determination means 47 of the computer 40 determines that the soil is a mass but is moist and the soil Sd is relatively soft. Such soil Sd outputs the soil quality determination result of the determination means 47 to the sorting device 37 via the output means 48, guides the cohesive soil Sd to the modifier adding device 8d by the sorting device 37, and guides the cohesive soil Sd to the modifier adding device 8d. In 8d, a normal amount of the soil modifier is put into the soil S, and the soil S and the modifier are mixed in the mixing device 9d to reform the soil.

Step S11 of FIG. 3 shows that when the particle size of the cohesive soil is relatively small (for example, the average value of the particle size is less than 20 mm) and the water content ratio is high (for example, less than 55%) as shown in FIG. 3 (D). It is shown that the determination means 47 of the computer 40 determines that the soil is muddy soil Se. Since such soil Se has a very low viscosity, the soil quality determination result of the determination means 47 is output to the sorting device 37 via the output means 48, and the cohesive soil Se is transferred to the modifier adding device 8e by the sorting device 37. In the guide, the modifier adding device 8e puts more soil modifier than usual into the soil S, and the mixing device 9e mixes the soil S with the modifier to reform the soil.

In step S12 of FIG. 3, as shown in FIG. 3 (E), the solidified cohesive soil has a relatively large particle size (for example, the average particle size is 20 mm or more) and the water content ratio is medium (for example, 40 to 55%). If it is less than), it is shown that the determination means 47 of the computer 40 determines that the soil Sf is hard and solidified. Since such soil Sf is often very firmly solidified, the soil quality determination result of the determination means 47 is output to the sorting device 37 via the output means 48, and the cohesive soil Sf is modified by the sorting device 37. Soil to the modifier 8f, which is suitable for injecting more soil modifier than usual in the modifier addition device 8f into the soil S, or breaking the cohesive soil that is a mass of soil. It is desirable to add S together with the soil conditioner and reform it by mixing the soil S and the modifier in the mixing device 9f.

In steps S09 to S12 of FIG. 2, after determining soils Sc to Sf containing solidified cohesive soil requiring reforming, the process returns to step S01 and the above-mentioned steps S01 to S12 are repeated. Regarding the soil S brought into the site at the intermediate storage facility, the soil quality of the soil Sa to Sf is continuously determined according to the flow chart of FIG. 2, and the necessary modification for the soil Sa to Sf is performed based on the soil quality determination result. By applying the quality, even if the soil S to be brought in contains a large amount of cohesive soil, the soil S that always satisfies the required soil quality can be continuously supplied to the site.

In this way, it is possible to provide a "method and system capable of determining the soil quality of soil containing cohesive soil that can be a mass (aggregate)", which is an object of the present invention.

FIG. 4B shows another embodiment of the vibrating belt conveyor 10 suitable for the present invention. In the vibration belt conveyor 10 of the illustrated example, the load of the carrier roller 15 is cut off from both the supports 21 and 25 between the first support 21 of the intermediate portion 20 and the second support 25 of the downstream portion 19b described above. A third support 23 is provided to support the third support 23, and a vibrating device 24 for vibrating the third support 23 is provided. The third support 23 is supported on the base of the construction site. The vibrating device 22 vibrates the first support 21, and at the same time, the vibrating device 24 vibrates the third support 23.

Also in the vibrating belt conveyor 10 of FIG. 4B, since the supports 21, 23, and 25 are cut off from each other, the load of the carrier roller 15 directly above the third support base 23 is applied to the other support base 21, It is not transmitted to the 25, and the vibration of the third support 23 is not transmitted to the other supports 21 and 25. The third support 23 may be vibrated under the same vibration conditions as the first support 21 (for example, the vibration frequency, amplitude, and vibration output are all the same), but the vibration conditions are different from those of the first support 21 (for example, the vibration frequency, amplitude, and vibration output are all the same). For example, it can be vibrated under different conditions such as vibration frequency, amplitude, and vibration output). The vibration device 24 of the illustrated example is connected to the computer 40 via a vibration control device 32, and the vibration condition (for example, vibration frequency, amplitude, vibration output, etc.) of the vibration device 24 is appropriately switched by the computer 40 as needed. be able to.

That is, also in the vibrating belt conveyor 10 of FIG. 4B, by vibrating the vibrating devices 22 and 24, only the intermediate portion 20 supported by the first support 21 and the third support 23 is vibrated and mounted. The surface can be divided into three parts along the transport direction: a vibration-free area, a vibration-free area, and a vibration-free area. Further, by vibrating the vibrating devices 22 and 24 under different vibration conditions, the vibration conditions can be changed according to the properties of the soil S.

1 ... Collection site (ground) 1a ... Crushing device 2 ... Stockyard 3 ... Transport device (truck, etc.)
4 ... Hopper 5,5a, 5b ... Imaging device 6 ... Photography building 7,7a, 7b ... Moisture meter 8 ... Modifier addition device 9 ... Mixing device 10 ... Vibration belt conveyor 11 ... Drive pulley (drive pulley)
12 ... Drive device 13 ... Tail pulley 14 ... Conveyor belt 15, 16 ... Carrier roller 17 ... Snap pulley 19a ... Upstream part (vibration-free area) 19b ... Downstream part (vibration-free area)
20 ... Middle part (vibration area)
21 ... 1st support 22 ... Vibration device 23 ... 3rd support 24 ... Vibration device 25 ... 2nd support 26 ... Carry-in belt conveyor 27 ... Carry-out belt conveyor 31, 32 ... Vibration control device 33 ... Drive control device 36, 37 ... Separation device 40 ... Computer 41 ... Input means 42 ... Measuring means 43 ... Pre-vibration particle size distribution measuring means 44 ... Post-vibration particle size distribution measuring means 45 ... Particle size distribution change detecting means 46 ... Water content ratio measuring means 47 ... Judgment means 48 ... Output means G, Ga, Gb ... Image S ... Soil (raw soil)
P, Pa, Pb ... Particle size distribution (distribution of particle and soil mass diameter)
V ... Change in particle size distribution (distribution of particle and soil mass diameter) W ... Water content ratio

Claims (7)

While applying vibration to the soil, images of the soil before and after the vibration are taken, the distribution of the diameters of the particles and the soil mass is measured from the images before and after the vibration, and the changes in the diameter distribution of the particles and the soil mass before and after the vibration are used. A soil quality determination method that determines the soil quality of the soil. The soil quality determination method according to claim 1, wherein the soil quality of the soil is determined from the distribution of the diameters of the particles and the soil mass after the vibration and the change in the diameter distribution of the particles and the soil mass before and after the vibration. In the method of claim 2, the water content ratio of the soil is measured at least one before and after the vibration, and the distribution of the diameters of the particles and the soil mass after the vibration, the change in the diameter distribution of the particles and the soil mass before and after the vibration, and the water content. A soil quality determination method for determining the soil quality of the soil from the ratio. A belt conveyor that transports soil and has a vibrating area in the middle, and a measuring means that measures the distribution of the diameters of particles and soil mass by taking images of the soil being transported at the upstream and downstream parts of the belt conveyor, respectively. , And a soil quality determination system including a determination means for determining the soil quality of the soil from changes in the diameter distribution of particles and soil masses in the upstream and downstream portions. In the system of claim 4 , the belt conveyor supports the first support that supports the carrier roller in the intermediate portion, and the carrier rollers in the upstream and downstream portions of the intermediate portion that are trimmed from the first support. A soil quality determination system including a second support and a vibrating device that vibrates the first support. In the system of claim 4 or 5 , the soil quality of the soil is determined from the changes in the diameter distribution of the particles and the soil mass in the downstream portion and the diameter distribution of the particles and the soil mass in the upstream portion and the downstream portion by the determination means. Soil quality judgment system. In the system of claim 6 , a moisture meter for measuring the water content ratio of the soil is provided at least one before and after the vibration area, and the distribution of the diameters of the particles and the soil mass in the downstream portion and the upstream portion and the soil mass are provided by the determination means. A soil quality determination system for determining the soil quality of the soil from changes in the diameter distribution of particles and soil masses in the downstream portion and the water content ratio.