JP3686893B2 - Waste mud reuse system and waste mud reuse method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste mud reuse system and a waste mud reuse method that can be suitably implemented to treat the waste mud generated at the time of excavating natural ground in the mud concentration type propulsion method and reuse it as a face stabilizer, for example.
[0002]
[Prior art]
In the mud concentration type propulsion method, mud soil discharged from the excavator when excavating a natural ground (hereinafter, this mud soil may be referred to as “drained mud soil”) is used to stabilize the face during excavation. Since the face stabilizer is included, all of the mud is discarded as industrial waste. In recent years, due to the shortage of final disposal sites and environmental conservation, sand having a particle size of 74 micrometers or more and less than 2 millimeters and gravel having a particle diameter of 2 millimeters or more and less than 75 millimeters have been separated from the mudstone, There is a movement to reduce the amount of waste that must be disposed of by landfill.
[0003]
As a first conventional technique for treating such waste mud, sand having a particle size larger than gravel and gravel is removed from the waste mud from the excavator using a vibrating sieve, and the sand is removed from the mud that has passed through the vibrating sieve with a cyclone. There is a method of separating and recovering muddy water containing clay and silt, returning a part of the muddy water to the excavator for reuse, and dewatering the remaining muddy water to reduce waste (for example, patents) Reference 1).
[0004]
As a second conventional technique, a large-grain gravel is removed from the mud from the excavator using a mesh-shaped rotating drum, and gravel is removed from the mud passing through the rotating drum using a vibrating screen. There is a method in which muddy water containing silt and clay is separated from the mud that has passed through the first vibrating screen, and the muddy water is returned to the excavator and reused (see, for example, Patent Document 2).
[0005]
As a third conventional technique, there is an apparatus that separates mud soil according to particle size using a plurality of concentrated cyclones (see, for example, Patent Document 3).
[0006]
[Patent Document 1]
JP-A-6-304597 (page 3, FIG. 2)
[Patent Document 2]
JP 2001-193099 A (page 5, page 7, FIG. 2, FIG. 5)
[Patent Document 3]
JP-A-6-198212 (page 3-4, FIG. 1)
[0007]
[Problems to be solved by the invention]
The mud soil has a very high viscosity and specific gravity, and clay and silt adhere to the sand and gravel contained in the mud soil. In the first prior art described above, since the mud soil containing solids of various particle sizes discharged from the excavator is directly applied to one vibrating sieve, it adheres to large particle size solids such as gravel. It is very difficult to separate small solids such as clay and silt from the gravel.
[0008]
Further, in the second prior art described above, although the gravel having a large particle size is removed from the mud soil from the excavator by the rotating drum, the muddy water passing through the rotating drum has a large solid content having a relatively large particle size. As well as being contained, solid content of various particle sizes is included, so it is difficult to remove the small particle size solid matter adhering to the large particle size solid matter with one vibrating sieve. It is.
[0009]
Further, in the third prior art described above, a plurality of concentrated cyclones can be used to concentrate the discharged mud and separate it according to particle size, but the treatment applied to the mud for returning the mud to the excavator for reuse. Is not disclosed.
[0010]
As described above, with these conventional techniques, it is difficult to reliably separate clay and silt from sand and gravel. In addition, the muddy water other than returning to the excavator becomes surplus muddy water, and such surplus muddy water is treated as waste, making it difficult to reduce the amount of waste.
[0011]
Therefore, an object of the present invention is to efficiently remove gravel and sand from the mud soil, and to reliably separate and recover components that can be reused as a face stabilizer from the mud soil, thereby reducing the amount of waste. It is to provide a mud reuse system and waste mud reuse method.
[0012]
[Means for Solving the Problems]
  The present invention as set forth in claim 1 is a jetting means for injecting a treatment liquid onto drainage mud from an excavator that excavates a natural ground, and turning the mud mud into fluid mud.
  A primary treatment device comprising a first vibrating sieve capable of passing a solid content less than a predetermined first particle size contained in the muddy water.And
  A second vibrating sieve that is capable of passing a solid content less than a second particle size smaller than the first particle size contained in the muddy water that has passed through the first vibrating sieve of the primary treatment device;
  The muddy water that has passed through the second vibrating sieve is concentrated by centrifugation to a solid content greater than or equal to the third particle size smaller than the second particle size, and discharged separately from the solid content less than the third particle size. A concentrated cyclone
  The muddy water containing solid content less than the third particle size discharged from the concentrated cyclone is centrifuged to obtain a solid content greater than or equal to the fourth particle size smaller than the third particle size and a solid content less than the fourth particle size. Classifying cyclones that are separated into separate and discharged separately;
  The second particle size contained in the muddy water containing a solid content of the third particle size or more discharged from the concentrated cyclone and the muddy water containing a solid content of the fourth particle size or more discharged from the classification cyclone. A third vibrating sieve through which a solid content smaller than the fifth particle size can pass,
  A waste mud reuse system, further comprising a secondary treatment device for circulating the muddy water that has passed through the third vibrating screen to the concentrated cyclone.
[0013]
According to the present invention, the treatment liquid is jetted onto the mud from the excavator that excavates the natural ground by the jetting means of the primary treatment apparatus, and the mud becomes the fluid mud. At this time, the solid content having a smaller particle size than the gravel such as sand, silt and clay, which is attached to the solid content having a relatively large particle size such as gravel, for example, is contained in the mud soil.
[0014]
Moreover, the solid content less than the predetermined first particle size contained in the muddy water passes through the first vibrating sieve. At this time, the solid content contained in the muddy water is separated into a solid content greater than or equal to the first particle size and a solid content less than the first particle size. If the solid content equal to or larger than the first particle size is, for example, gravel, the first vibration sieve separates the solid content contained in the muddy water into solid content having a particle size smaller than the gravel. Further, when the first vibrating sieve vibrates, the solid content and the liquid content less than the first particle size adhering to the solid content having the first particle size or more are separated from the solid content having the first particle size or more. As described above, the treatment liquid injection and the first vibrating sieve can efficiently and surely separate the solid content of the first particle size or more contained in the mud soil from the remaining solid content.
[0016]
  PreviousThe solid content less than the second particle size smaller than the first particle size contained in the muddy water that has passed through the first vibration sieve of the primary processing apparatus passes through the second vibration sieve. At this time, the solid content contained in the muddy water is separated into a solid content greater than or equal to the second particle size and a solid content less than the second particle size. If the solid content equal to or greater than the second particle size is, for example, sand having a particle size equal to or greater than medium sand, the solid content contained in the muddy water includes sand having a particle size equal to or greater than medium sand by the second vibrating sieve. It is separated into a solid content and a solid content with a particle size less than medium sand. Further, when the second vibrating sieve vibrates, the solid content and the liquid content less than the second particle size adhering to the solid content having the second particle size or more are separated from the solid content having the second particle size or more. In this way, the solid content of the second particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0017]
Further, among the solid content contained in the muddy water that has passed through the second vibrating screen, the solid content that is not less than the third particle size smaller than the second particle size is concentrated by the concentrated cyclone and less than the third particle size. It is discharged separately from the solid content. If the solid content of the third particle size or more is, for example, sand having a particle size of fine sand or more, the concentrated cyclone concentrates the sand of fine particle size or more out of the solid content contained in the muddy water. Silt and clay, which are solids with a particle size smaller than fine sand, are discharged separately from the concentrated sand. In this way, the solid content of the third particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0018]
Further, among the solids contained in the mud discharged from the concentrated cyclone, the solids having a particle size of less than the third particle size are obtained by the classification type cyclone with a solid content of the fourth particle size or more smaller than the third particle size. Separated into solids having a particle size of less than the fourth particle size and discharged individually. If the solid content of the fourth particle size or more is, for example, a silt having a relatively large particle size, the solid content contained in the muddy water is separated from the silt having a relatively large particle size by the classification type cyclone. Separated into solids containing small silt and clay. In this way, the solid content of the fourth particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0019]
Further, the second particles contained in the muddy water containing a solid content of a third particle size or more discharged from the concentrated cyclone and the muddy water containing a solid content of a fourth particle size or more discharged from the classification cyclone. Solids less than the fifth particle size smaller than the diameter pass through the third vibrating sieve. At this time, the solid content contained in the muddy water is separated into a solid content of less than the fifth particle size and a solid content of the fifth particle size or more. Further, when the third vibrating sieve vibrates, the solid content and the liquid content less than the third particle size adhering to the solid content having the third particle size or more are separated from the solid content having the third particle size or more. In this way, it is possible to reliably separate the solid content of the third particle size or more contained in the muddy water.
[0020]
Further, the muddy water that has passed through the third vibrating screen is circulated to the concentrated cyclone. Thus, the solid content contained in the muddy water is reliably separated by repeating the separation and concentration by the concentrated cyclone, the classified cyclone and the third vibrating sieve. As a result, the solid content contained in the mud discharged from the classified cyclone can be reliably recovered only as a solid having a particle size less than the fourth particle size. Such a solid content less than the fourth particle size is, for example, silt and clay having a relatively small particle size, and these solid content should be used as a face stabilizer for stabilizing the face when excavating a natural ground. Can do.
[0021]
  Claim2The described invention further includes first supply means for supplying muddy water containing solids less than the third particle size discharged from the concentrated cyclone to the injection means.
[0022]
According to the present invention, the muddy water containing the solid content of less than the third particle size discharged from the concentrated cyclone is supplied to the spraying means by the first supply means, so that the muddy water can be used as a treatment liquid. it can. By reusing muddy water in this way, the amount of muddy water to be discarded is reduced, the amount of waste generated when excavating natural ground is reduced, and the amount of processing liquid excluding muddy water to be reused is reduced. Or can be eliminated.
[0023]
  Claim3The described invention further includes a second supply means for supplying the excavator with muddy water containing a solid content of less than the fourth particle size discharged from the classified cyclone.
[0024]
According to the present invention, the muddy water containing the solid content less than the fourth particle size discharged from the classification cyclone is supplied to the excavator by the second supply means. Such a solid content less than the fourth particle diameter is, for example, silt and clay having a relatively small particle diameter, and these solid contents are suitable as a face stabilizer for stabilizing the face when excavating a natural ground. . By reusing muddy water in this way, the amount of muddy water to be discarded can be reduced, and the amount of waste generated when excavating natural ground can be reduced, and the face stabilizer that excludes muddy water to be reused Can be reduced or eliminated.
[0025]
  Claim4The described invention further includes a dehydrating means for dehydrating muddy water containing solids having a particle size of less than the fourth particle size discharged from the classified cyclone.
[0026]
According to the present invention, the dewatering means dewaters the mud containing solids having a particle size of less than the fourth particle size discharged from the classification type cyclone. Thus, the waste can be further reduced.
[0027]
  Claim5The described invention is a fluidization step of injecting a treatment liquid onto the mud from the excavator that excavates the natural ground using the jetting means, and converting the mud into a mud having fluidity.
  Using a first vibrating sieve through which a solid content less than a predetermined first particle size can pass, the solid content contained in the muddy water is a solid content less than a predetermined first particle size and greater than or equal to the first particle size. Including a first classification step that separates into solid contentSee
  After the first classification step, using a second vibrating sieve through which the solid content of the second particle size smaller than the first particle size can pass, the solid content less than the first particle size contained in the muddy water, A second classification step for separating the solid content less than the second particle size smaller than the first particle size into the solid content greater than the second particle size;
  Using a concentrated cyclone, out of the solid content less than the second particle size contained in the muddy water, the solid content not less than the third particle size smaller than the second particle size is concentrated by centrifugation, and the first A concentration step of discharging separately from the solid content of less than 3 particle sizes;
  Using a classification type cyclone, a solid content less than the third particle size contained in the mud discharged from the concentrated cyclone is solidified by a centrifugal separation with a solid content not less than the fourth particle size smaller than the third particle size. A centrifugal classification step of separating and solidly discharging the solids having a particle size of less than the fourth particle size;
  Using a third vibrating sieve capable of passing a solid content having a fifth particle size smaller than the second particle size, the solid content having a particle size equal to or greater than the third particle size contained in the muddy water discharged from the concentrated cyclone, and A third component that separates the solid content greater than or equal to the fourth particle size discharged from the classified cyclone into a solid content less than the fifth particle size smaller than the second particle size and a solid content greater than the fifth particle size. A classification process;
  A method for recycling mud soil, further comprising a circulation step of circulating a mud containing solid content less than the fifth particle size to the concentrated cyclone.
[0028]
According to the present invention, in the fluidizing step, the treatment liquid is sprayed on the mud from the excavator that excavates the natural ground, and the mud becomes the fluid mud. At this time, the solid content having a smaller particle size than the gravel such as sand, silt and clay, which is attached to the solid content having a relatively large particle size such as gravel, for example, is contained in the mud soil.
[0029]
In the first classification step, the solid content contained in the muddy water is separated by the vibrating sieve into a solid content having a particle size equal to or greater than the first particle size and a solid content having a particle size less than the first particle size. If the solid content equal to or larger than the first particle size is, for example, gravel, the first vibration sieve separates the solid content contained in the muddy water into solid content having a particle size smaller than the gravel. Further, when the vibrating screen vibrates, the solid content and the liquid content less than the first particle size adhering to the solid content having the first particle size or more are separated from the solid content having the first particle size or more. As described above, the treatment liquid injection and the first vibrating sieve can efficiently and surely separate the solid content of the first particle size or more contained in the mud soil from the remaining solid content.
[0031]
  FirstIn the two-classification step, the solid content less than the second particle size smaller than the first particle size contained in the muddy water that has passed through the first vibration sieve is changed to a solid content greater than or equal to the second particle size by the second vibration sieve. Separated into a solid content less than the second particle size. If the solid content equal to or greater than the second particle size is, for example, sand having a particle size equal to or greater than medium sand, the solid content contained in the muddy water includes sand having a particle size equal to or greater than medium sand by the second vibrating sieve. It is separated into a solid content and a solid content with a particle size less than medium sand. Further, when the second vibrating sieve vibrates, the solid content and the liquid content less than the second particle size adhering to the solid content having the second particle size or more are separated from the solid content having the second particle size or more. In this way, the solid content of the second particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0032]
In the concentration step, of the solid content contained in the muddy water that has passed through the second vibrating screen, the solid content of the third particle size that is smaller than the second particle size is concentrated by the concentrated cyclone, and the third It is discharged separately from the solid content less than the particle size. If the solid content of the third particle size or more is, for example, sand having a particle size of fine sand or more, the concentrated cyclone concentrates the sand of fine particle size or more out of the solid content contained in the muddy water. Silt and clay, which are solids with a particle size smaller than fine sand, are discharged separately from the concentrated sand. In this way, the solid content of the third particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0033]
In the centrifugal classification step, the solid content less than the third particle size out of the solid content contained in the mud discharged from the concentrated cyclone is equal to or greater than the fourth particle size smaller than the third particle size by the classification cyclone. Are separated into a solid content of less than the fourth particle size and discharged separately. If the solid content of the fourth particle size or more is, for example, a silt having a relatively large particle size, the solid content contained in the muddy water is separated from the silt having a relatively large particle size by the classification type cyclone. Separated into solids containing small silt and clay. In this way, the solid content of the fourth particle size or more contained in the muddy water can be reliably separated from the muddy water.
[0034]
In a 3rd classification process, it is contained in the muddy water containing the solid content more than the 3rd particle size discharged | emitted from the said concentration type cyclone, and the muddy water containing the solid content more than the 4th particle size discharged | emitted from the said classification type cyclone. The solid content smaller than the second particle size and less than the fifth particle size passes through the third vibrating sieve. At this time, the solid content contained in the muddy water is separated into a solid content of less than the fifth particle size and a solid content of the fifth particle size or more. Furthermore, when the third vibrating screen vibrates, the solid content and the liquid content less than the fifth particle size adhering to the solid content having the fifth particle size or more are separated from the solid content having the fifth particle size or more. In this way, it is possible to reliably separate the solid content of the fifth particle size or more contained in the muddy water.
[0035]
In the circulation step, the muddy water that has passed through the third vibrating screen is circulated to the concentrated cyclone. Thus, the solid content contained in the muddy water is reliably separated by repeating the separation and concentration in the concentration step, the centrifugal classification step, and the third classification step. As a result, in the centrifugal classification process, the solid content contained in the mud discharged from the classification type cyclone can be reliably recovered only as a solid having a particle size less than the fourth particle size. Such a solid content less than the fourth particle size is, for example, silt and clay having a relatively small particle size, and these solid content should be used as a face stabilizer for stabilizing the face when excavating a natural ground. Can do.
[0036]
  Claim6The described invention further includes a first muddy water supply step of supplying muddy water containing solids less than the third particle size discharged from the concentrated cyclone to the spraying means.
[0037]
According to the present invention, in the first muddy water supply step, muddy water containing a solid content less than the third particle size discharged from the concentrated cyclone is supplied to the injection means, and therefore, the muddy water is used as a treatment liquid. Can do. By reusing muddy water in this way, the amount of muddy water to be discarded is reduced, the amount of waste generated when excavating natural ground is reduced, and the amount of processing liquid excluding muddy water to be reused is reduced. Or can be eliminated.
[0038]
  Claim7The described invention further includes a second muddy water supply step of supplying muddy water containing solids less than the fourth particle size discharged from the classified cyclone to the excavator.
[0039]
According to the present invention, in the second muddy water supply step, muddy water containing a solid content of less than the fourth particle size discharged from the classification cyclone is supplied to the excavator. Such a solid content less than the fourth particle diameter is, for example, silt and clay having a relatively small particle diameter, and these solid contents are suitable as a face stabilizer for stabilizing the face when excavating a natural ground. . By reusing muddy water in this way, the amount of muddy water to be discarded can be reduced, and the amount of waste generated when excavating natural ground can be reduced, and the face stabilizer that excludes muddy water to be reused Can be reduced or eliminated.
[0040]
  Claim8The described invention further includes a dehydration step of dehydrating muddy water containing a solid content of less than the fourth particle size discharged from the classified cyclone.
[0041]
According to the present invention, in the dehydration step, the muddy water containing solids having a particle size less than the fourth particle size discharged from the classification cyclone is dehydrated, so that the waste water generated when excavating the ground is removed. Thus, the waste can be further reduced.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram schematically illustrating a configuration of a mud soil reuse system 1 and a muddy water flow according to an embodiment of the present invention. In the present embodiment, the “particle size” is a particle size defined by the Japan Geotechnical Society standard “Engineering Classification Method of Geomaterial” (JGS 0051-2000). In addition, the test for classifying the ground material is performed based on “Soil Grain Size Test Method” (JIS A 1204) of Japanese Industrial Standard. For example, in the mud concentration type propulsion method, the mud mud reuse system 1 can be referred to as mud discharged from a digging machine (not shown) when excavating a natural ground (hereinafter, this mud is referred to as “mud mud”). It is a system that processes and reuses. The waste mud reuse system 1 includes a primary processing device 2 and a secondary processing device 3.
[0043]
The primary processing apparatus 2 includes a receiver tank 4, an injection unit 5, a first upstream vibrating sieve 6, a first downstream vibrating sieve 7, and a first storage tank 8. The receiver tank 4 temporarily holds the mud drained from the excavator and discharges it from a discharge port provided in the lower part to a first upstream vibrating sieve 6 described later. The mud soil from the excavator contains a face stabilizer for stabilizing the face.
[0044]
The injection part 5 which is an injection means injects a process liquid to the waste mud discharged | emitted from the receiver tank 4 to the 1st upstream vibration sieve 6, and makes a waste mud into fluid mud. At this time, the solid content having a smaller particle size than the gravel such as sand, silt and clay, which is attached to the solid content having a relatively large particle size such as gravel, for example, is contained in the mud soil.
[0045]
The injection of the treatment liquid onto the mud soil by the spray unit 5 may be performed on the mud soil held in the receiver tank 4, for example. In this case, the treatment liquid may be ejected from each of the ejection nozzles in a tangential direction perpendicular to the radial direction of the receiver tank 4 from an ejection nozzle using a plurality of ejection nozzles. The mud soil retained in the receiver tank 4 is agitated by the water flow formed by the treatment liquid ejected from each injection nozzle of the injection unit, and compared with gravel etc. by the water pressure of the treatment liquid from the injection nozzle. Compared to gravel such as sand, silt and clay, which adheres to solids having a large particle size, solids having a small particle size can be detached from the gravel. In this case, the spray nozzle can be applied to the waste mud at a high pressure by using a straight nozzle in which the treatment liquid is jetted in a cylindrical shape, so that the waste mud can flow efficiently. Can be
[0046]
The receiver tank 4 has, for example, two holding tanks arranged vertically, and the two holding tanks are connected by an openable / closable communicating portion, and a discharge port is provided at a lower portion of the lower holding tank. May be. In this case, the communication portion is closed, the mud soil from the excavator is held in the upper holding tank, and when the mud soil held in the upper holding tank reaches a predetermined amount, the communication portion is opened, The waste mud held in the upper holding tank is discharged to the lower holding tank. In this way, the treatment liquid may be sprayed by the spraying unit 5 to the mud discharged to the lower holding tank.
[0047]
Further, for example, two receiver tanks 4 may be used and arranged adjacent to each other in the horizontal direction to hold the mud from the excavator alternately. In this case, the mud soil may be alternately supplied to each receiver tank by interposing a switching valve in the supply path of the mud soil to each receiver tank. As a result, the mud soil can be efficiently fluidized.
[0048]
The first upstream vibrating screen 6 is disposed below the receiver tank 4 and has a net portion through which a solid content having a predetermined coarse particle diameter contained in the muddy water can pass, and reciprocally vibrates the net portion in the vertical direction. . A plurality of through holes having an inner diameter penetrating in the thickness direction and having the same size as the grain size are formed in the mesh portion of the first upstream vibrating sieve 6. The coarse particle diameter is, for example, 50 millimeters in the present embodiment.
[0049]
The solid content contained in the muddy water is separated into a solid content that is less than the coarse particle size that passes through the mesh portion of the first upstream vibrating sieve 6 and a solid content that is greater than the coarse particle size that cannot pass through the mesh portion. Due to the vibration of the mesh portion of the first upstream vibrating screen 6, the solid content not smaller than the coarse particle size that cannot pass through the mesh portion moves in a substantially horizontal direction. At this time, the solid content and the liquid content less than the coarse particle size adhering to the solid content having the coarse particle size or more are separated from the solid content having the coarse particle size or more and pass through the first upstream vibrating sieve 6. Due to the vibration of the mesh portion of the first upstream vibrating screen 6, the solid content larger than the coarse particle size moving in the substantially horizontal direction is discharged to the earth and sand pit 10 provided outside the primary processing device 2 and the secondary processing device 3. The
[0050]
The first downstream vibrating sieve 7 is disposed below the first upstream vibrating sieve 6 and is contained in the muddy water that has passed through the first upstream vibrating sieve 6 and is a solid having a particle size less than the first particle size smaller than the coarse particle size. It has a net part through which the minute can pass, and the net part is reciprocally oscillated in the vertical direction. In the present embodiment, the mesh portion of the first downstream vibrating sieve 6 and the mesh portion of the first upstream vibrating sieve 7 are arranged side by side in the vertical direction. A plurality of through holes having an inner diameter penetrating in the thickness direction and having the same size as the first particle diameter are formed in the mesh portion of the first downstream vibrating sieve 7. The first particle size is, for example, 20 millimeters in the present embodiment. Moreover, solid content more than a 1st particle size is solid content which is a particle size more than coarse gravel with a comparatively big particle size, for example among gravel.
[0051]
The solid content contained in the muddy water is separated into a solid content less than the first particle size that passes through the mesh portion of the first downstream vibrating sieve 7 and a solid content that is greater than the first particle size that cannot pass through the mesh portion. . Due to the vibration of the mesh portion of the first downstream vibrating screen 7, the solid content not smaller than the first particle size that cannot pass through the mesh portion moves in a substantially horizontal direction. At this time, the solid content and liquid content less than the first particle size adhering to the solid content of the first particle size or more are separated from the solid content of the first particle size or more and pass through the first downstream vibrating sieve 7. Then, it flows down to the first storage tank 8 to be described later. Due to the vibration of the mesh portion of the first downstream vibrating sieve 7, the solid content of the first particle size or more moving in the substantially horizontal direction is discharged to the earth and sand pit 10. In the present embodiment, the first vibrating sieve includes the first upstream vibrating sieve 6 and the first downstream vibrating sieve 7.
[0052]
The 1st storage tank 8 is arrange | positioned under the 1st downstream vibration sieve 7, and stores the muddy water containing the solid content below the 1st particle size which flowed down and passed through the said 1st downstream vibration sieve 7. FIG. At the bottom of the first storage tank 8, there is provided a first delivery section 9 that delivers muddy water stored in the first storage tank 8 to the second vibrating sieve 11 of the secondary processing device 3 to be described later. The first delivery unit 9 is realized by a pump, for example. As described above, the primary treatment apparatus 2 stores the muddy water containing the solid content of less than the first particle size in the first storage tank 8 and pays out only the solid content of the first particle size or more to the earth and sand pit 10.
[0053]
The secondary processing apparatus 3 includes a second vibrating sieve 11, a second storage tank 12, a concentration type cyclone 13, an adjustment tank 14, a classification type cyclone 15, and a third vibrating sieve 16. The second vibrating screen 11 is capable of passing a solid content smaller than the first particle size and less than the second particle size out of the solid content contained in the muddy water sent from the first storage tank 8 by the first delivery unit 9. A net part is provided, and the net part is reciprocated in the vertical direction. A plurality of through holes having an inner diameter penetrating in the thickness direction and having the same size as the second particle diameter are formed in the mesh portion of the second vibrating sieve 11. In the present embodiment, the second particle size is 2 millimeters, for example. Moreover, solid content more than a 2nd particle size is solid content which is a particle size more than a gravel, for example.
[0054]
The solid content contained in the muddy water from the first storage tank 8 is a solid content less than the second particle diameter that passes through the mesh portion of the second vibrating sieve 11 and a solid that is greater than the second particle size that cannot pass through the mesh portion. Separated into minutes. Due to the vibration of the mesh portion of the second vibrating screen 11, the solid content not smaller than the second particle size that cannot pass through the mesh portion moves in a substantially horizontal direction. At this time, the solid content and the liquid content less than the second particle size adhering to the solid content of the second particle size or more are separated from the solid content of the second particle size or more and pass through the second vibrating sieve 11, It flows down to the second storage tank 12 described later. Due to the vibration of the mesh portion of the second vibrating screen 11, the solid content of the second particle size or more that moves in a substantially horizontal direction is discharged to the earth and sand pit 10.
[0055]
The 2nd storage tank 12 is arrange | positioned under the 2nd vibration sieve 11, and stores the muddy water containing the solid content less than the 2nd particle size which flowed down and passed through the said 2nd vibration sieve 11. FIG. At the bottom of the second storage tank 12, a second delivery unit 17 is provided that sends muddy water stored in the second storage tank 12 to a concentrated cyclone 13 described later. The 2nd sending part 17 is realized by a pump, for example.
[0056]
Concentrated cyclone 13 concentrates mud containing solid content greater than the set particle size by centrifugation and discharges it as underflow, and discharges mud containing solid content less than the particle size as overflow. In more detail, the concentrated cyclone 13 concentrates the muddy water that has passed through the second vibrating sieve 11 with a solid content of a third particle size that is smaller than the second particle size, and underflows the muddy water containing the solid content. As a flow, while discharging to the 3rd vibration sieve 16 arrange | positioned under the concentration type cyclone 13, the muddy water containing solid content less than the said 3rd particle size is discharged to the adjustment tank 14 mentioned later as an overflow. In the present embodiment, the third particle size may be about 0.1 millimeters, for example.
[0057]
The adjustment tank 14 stores muddy water containing a solid content less than the third particle size discharged as an overflow from the concentrated cyclone 13. The adjustment tank 14 is provided with a stirrer 18 for stirring so that the stored muddy water is not separated into a solid content and a liquid content. Adjustments such as adding water are made so that the muddy water stored in the adjustment tank 14 always has a predetermined specific gravity. In this Embodiment, the specific gravity of the muddy water stored in the adjustment tank 14 is set based on the soil condition of the natural ground excavated in the mud type propulsion method.
[0058]
At the bottom of the adjustment tank 14, a first supply that is a first supply means that supplies the muddy water, which is stored in the adjustment tank 14 and contains a solid content less than the third particle size, to the injection unit 5 of the primary treatment device 2. A part 19 is provided. In addition, the bottom of the adjustment tank 14 is provided with a third delivery unit 20 that delivers muddy water that is stored in the adjustment tank 14 and contains a solid content less than the third particle diameter to a classification cyclone 15 that will be described later. Both the first supply unit 19 and the third delivery unit 20 include an on-off valve and a pump.
[0059]
The classification type cyclone 15 discharges muddy water containing a solid content equal to or larger than a set particle diameter as an underflow by centrifugal separation, and discharges muddy water containing a solid content less than the particle diameter as an overflow. More specifically, the classification type cyclone 15 is smaller than the third particle size of muddy water from the adjustment layer 14, in other words, muddy water containing solids less than the third particle size discharged from the concentrated cyclone 13. It separates into solid content of the 4th particle size or more and solid content of less than the 4th particle size, and the mud containing the solid content of the 4th particle size or more is made underflow, and it is arranged under the classification type cyclone 15. While discharging | emitting to the 3rd vibration sieve 16, the muddy water containing solid content less than a 4th particle size is discharged | emitted separately as it is discharged to the excess muddy water layer 21 mentioned later as an overflow. In the present embodiment, the fourth particle size is, for example, about 30 micrometers or more and 40 micrometers or less. The solid content less than the fourth particle size is, for example, silt and clay having a relatively small particle size among silts.
[0060]
The third vibrating sieve 16 is disposed at a position below the concentrated cyclone 13 and the classification cyclone 15 and above the second vibrating sieve 11, and has a particle size equal to or larger than the third particle size discharged from the concentrated cyclone 13 as an underflow. Solids less than the fifth particle size smaller than the second particle size, which are contained in the muddy water containing the solid content and muddy water containing the solid content of the fourth particle size or more discharged from the classification cyclone 15 as an underflow. It has a net part through which the minute can pass, and the net part is reciprocally vibrated up and down. In the present embodiment, the mesh portion of the third vibrating sieve 16 and the mesh portion of the second vibrating sieve 11 are arranged side by side in the vertical direction. The mesh portion of the third vibrating screen 16 is formed with a plurality of through holes having an inner diameter that is opposite to the thickness direction and having the same size as the fifth particle size. In the present embodiment, the fifth particle size is, for example, 0.5 millimeters or 0.35 millimeters. Moreover, solid content more than a 5th particle size is a medium sand and sand with comparatively big particle size, for example among sand.
[0061]
The solid content contained in the muddy water is separated into a solid content of less than the fifth particle size that passes through the mesh portion of the third vibrating sieve 16 and a solid content of the fifth particle size or more that cannot pass through the mesh portion. Due to the vibration of the mesh portion of the third vibrating screen 16, the solid content not smaller than the fifth particle size that cannot pass through the mesh portion moves in a substantially horizontal direction. At this time, the solid content and the liquid content less than the fifth particle size adhering to the solid content of the fifth particle size or more are separated from the solid content of the fifth particle size or more and pass through the third vibrating sieve 16, Furthermore, it passes through the second vibrating screen 11 and flows down to the second storage tank 12. The muddy water that passes through the third vibrating screen 16 and is stored in the second storage tank 12 is circulated to the concentrated cyclone 13. Due to the vibration of the mesh portion of the third vibrating sieve 16, the solid content of the fifth particle size or more moving in the substantially horizontal direction is paid out to the earth and sand pit 10.
[0062]
In order to reduce the particle size of the solids that pass through the third vibrating screen 16, if the inner diameter of the through hole of the mesh portion of the third vibrating screen 16 is set to 0.074 millimeters, for example, clogging occurs immediately and mud water Runs through the net. In order to prevent this, in the present embodiment, the inner diameter of the mesh portion is set to 0.5 mm or 0.35 mm so that it cannot pass through the third vibrating screen 16 and is placed on the upper portion of the mesh portion. The muddy water is filtered by using sand having a particle size of medium sand or larger, which is a solid content having a particle size of equal to or larger than the inner diameter, as a filter. As a result, solids such as sand having a smaller particle size adhere to the sand above the medium sand, and the particle size of the solids passing through the third vibrating screen 16 is made smaller than the inner diameter of the mesh part. Can do.
[0063]
The waste mud reuse system 1 further includes an excess mud water layer 21. The surplus muddy water layer 21 stores muddy water containing solid content less than the fourth particle size discharged as an overflow from the classification cyclone 15. The surplus muddy water tank 21 is provided with a stirrer 22 for stirring so that the stored muddy water is not separated into a solid content and a liquid content. Moreover, the mud plant which supplies the mud containing the solid content less than the 4th particle size stored in the surplus mud water tank 21 to the bottom part of the surplus muddy water tank 21, and containing the face stabilizer to an excavation machine (FIG. 2nd supply part 23 which is the 2nd supply means to supply to (not shown) is provided. In addition, the bottom of the adjustment tank 21 is provided with a first discharge unit 24 that discharges the muddy water stored in the excess muddy water tank 21 and containing solids having a particle size less than the fourth particle diameter to the slurry tank 25 described later as excess muddy water. It is done. Both the second supply unit 23 and the first discharge unit 24 include an open / close valve and a pump.
[0064]
The waste mud reuse system 1 further includes a slurry tank 25 and a flocculant storage tank 26. The slurry tank 25 stores surplus muddy water containing a solid content less than the fourth particle size discharged from the surplus muddy water tank 21. The flocculant storage tank 26 stores a polymer-based flocculant for separating the excess mud water stored in the slurry tank 25 into a solid content and a liquid content. The flocculant storage tank 26 is provided with a flocculant supply unit 27 for supplying the flocculant to the slurry tank 25. The flocculant supply unit 27 includes an open / close valve and a pump.
[0065]
The slurry tank 25 is provided with a stirrer 28 that stirs the stored excess mud water and the flocculant from the flocculant storage tank 26 so as to mix them. Further, the slurry tank 25 is provided with a second discharge unit 29 that discharges excess mud mixed with the stored flocculant to the dehydrator 30 described later. The second discharge unit 29 includes an open / close valve and a pump.
[0066]
The mud soil reuse system 1 further includes a dehydrator 30 that is a dehydrating means. The dehydrator 30 dehydrates the excess mud mixed with the flocculant from the slurry tank, and separates and discharges the solid and liquid components of the excess mud. The solid content of the excess mud discharged from the dehydrator 30 becomes a dehydrated cake, which is transported by a transport device 31 realized by a belt conveyor or the like, and is discharged to a sediment pit 32 provided downstream in the transport direction of the transport device 31. Is done.
[0067]
The waste mud reuse system 1 further includes a drain receiving tank 33 and a discharge tank 34. The drainage tank 33 stores the liquid content of excess mud discharged from the dehydrator 30. The drainage receiving tank 33 is provided with a third discharge portion 35 for sending the liquid content of excess mud water stored in the drainage receiving tank 33 to the discharge tank 34. The third discharge unit 35 is realized by a pump, for example. The discharge tank 34 is adjusted so that the amount of suspended suspended solids (abbreviation: SS) in the liquid portion of the excess muddy water from the filtrate receiving tank 33 becomes a value that can be discharged into the river. Surplus muddy water with SS below the above value is discharged into the river.
[0068]
FIG. 2 is a diagram schematically showing the configuration of a mud mud reuse system 1A and the flow of mud water according to another embodiment of the present invention. Since the waste mud reuse system 1A is substantially the same as the above-described waste mud reuse system 1, only different parts will be described below.
[0069]
At the bottom of the first storage tank 8 of the primary treatment device 2, muddy water that is stored in the adjustment tank 14 from the first supply unit 19 and contains a solid content less than the third particle size is stored in the first storage tank 8. And a jet stirring unit 36 that stirs the muddy water stored in the first storage tank 8. Therefore, the first supply unit 19 provided in the adjustment tank 14 supplies the muddy water, which is stored in the adjustment tank 14 and contains a solid content less than the third particle size, to the injection unit 5 of the primary treatment device 2, and It is also supplied to the jet stirring unit 36. As a result, it is possible to reliably prevent malfunction and failure of the first delivery unit 9 due to precipitation of the solid content contained in the muddy water stored in the first storage tank 8.
[0070]
FIG. 3 is a flowchart showing a procedure of the waste mud reuse method using the waste mud reuse system 1 shown in FIG. From the excavator that excavates the natural ground, the waste mud is introduced into the receiver tank 4 of the waste mud reuse system 1, and the procedure of the waste mud reuse method is started.
[0071]
In the fluidization step, the treatment liquid is sprayed onto the mud discharged from the receiver tank 4 to convert the mud into mud having fluidity, and the process proceeds to the first classification step. In the fluidization process, solids with a small particle size compared to gravel such as sand, silt and clay, which are attached to solid matter with a relatively large particle size, such as gravel, are contained in the mud soil. break away.
[0072]
In the first classifying step, a first upstream vibrating sieve 6 through which a solid content less than a predetermined grain size can pass and a first downstream vibration through which a solid content smaller than the first grain size and less than the first grain size can pass. Using the sieve 7, the solid content contained in the muddy water is separated into a solid content less than a predetermined first particle size and a solid content greater than the first particle size, and the process proceeds to a second classification step. In the first classification step, the solid content of the first particle size or more is dispensed to the earth and sand pit 10. Further, in the first classification step, the solid content and the liquid content less than the first particle size adhering to the solid content having the first particle size or more are separated from the solid content having the first particle size or more. Thus, solid content more than the 1st particle size contained in waste mud by injection of a processing liquid and separation by the 1st upstream vibration sieve 6 and the 2nd downstream vibration sieve 7 in a fluidization process and the 1st classification process. Can be efficiently and reliably separated from the remaining solids.
[0073]
In the second classifying step, the first upstream vibrating screen 6 and the second downstream side are used in the first classifying step by using the second vibrating screen 11 through which the solid content of the second particle size smaller than the first particle size can pass. The solid content less than the first particle size contained in the muddy water that has passed through the vibrating sieve 7 is converted into a solid content less than the second particle size smaller than the first particle size and a solid content greater than the second particle size. Separate and proceed to concentration step. In the second classification step, the solid content of the second particle size or more is dispensed to the earth and sand pit 10. In the second classifying step, the solid content and the liquid content less than the second particle size adhering to the solid content having the second particle size or more are separated from the solid content having the second particle size or more. As described above, in the second classification step, the solid content of the second particle size or more contained in the muddy water can be reliably separated from the remaining solid content by the second vibrating sieve.
[0074]
In the concentration step, the second particle size is obtained by centrifuging the solid content less than the second particle size contained in the muddy water that has passed through the second vibrating sieve 11 in the second classification step using the concentrated cyclone 13. The muddy water in which the solid content of the third particle size or smaller is discharged as an underflow, and the muddy water containing the solid content of less than the third particle size is discharged individually as an overflow. The treatment for the muddy water containing the solid content of less than the third particle size discharged as an overflow from the concentrated cyclone 13 is performed in the first muddy water supply process and the centrifugal classification process. Moreover, the process with respect to the muddy water containing solid content more than the 3rd particle size discharged | emitted as underflow from the concentration type cyclone 13 is performed in a 3rd classification process. Thus, the solid content more than the 3rd particle size contained in muddy water can be reliably isolate | separated from muddy water by the concentration by the concentration type cyclone 13 in a concentration process.
[0075]
In the centrifugal classification step, the classification cyclone 15 is used, and in the concentration step, the solid content less than the third particle size contained in the mud discharged as an overflow from the concentration type cyclone 13 is centrifuged to obtain the third particle size. And the solid content of the fourth particle size or smaller and the solid content of less than the fourth particle size are separated, and muddy water containing the solid content of the fourth particle size or more is discharged as an underflow, the fourth particle size Muddy water containing less than solid content is discharged individually as overflow. The treatment for the muddy water containing the solid content of less than the fourth particle size discharged as an overflow from the classified cyclone 15 is performed in the second muddy water supply process and the dewatering process. Moreover, the process with respect to the muddy water containing the solid content more than the 4th particle size discharged | emitted as underflow from the classification type cyclone 15 is performed in a 3rd classification process. As described above, in the centrifugal classification, the classification type cyclone 15 can reliably separate the solid content of the fourth particle size or more contained in the muddy water from the muddy water.
[0076]
In the third classification step, the muddy water discharged as an underflow from the concentrated cyclone 13 in the concentration step using the third vibrating sieve 16 through which the solid content of the fifth particle size smaller than the second particle size can pass. And a solid content greater than or equal to the third particle size and a solid content greater than or equal to the fourth particle size discharged as an underflow from the classification cyclone 15 in the centrifugal classification step is smaller than the second particle size. It separates into a solid content less than the particle size and a solid content greater than or equal to the fifth particle size, and proceeds to the circulation step. In the third classification step, the solid content of the fifth particle size or more is dispensed to the earth and sand pit 10. In the third classifying step, the solid content and the liquid content less than the fifth particle size adhering to the solid content having the fifth particle size or more are separated from the solid content having the fifth particle size or more. As described above, in the third classification step, the third vibrating screen 16 can reliably separate the solid content of the fifth particle size or more contained in the muddy water from the remaining solid content.
[0077]
In the circulation step, in the third classification step, the muddy water containing the solid content of less than the fifth particle size that has passed through the third vibrating sieve 16 is circulated to the concentrated cyclone 13 to return to the concentration step. Thus, the solid content contained in the muddy water is reliably separated by repeating the separation and concentration in the concentration step, the centrifugal classification step, and the third classification step. As a result, in the centrifugal classification step, the solid content contained in the muddy water discharged as an overflow from the classification type cyclone 15 can be surely made only to a solid matter having a particle size less than the fourth particle size. In the present embodiment, the solid content less than the fourth particle size is, for example, a silt having a relatively small particle size, specifically a particle size of, for example, about 30 micrometers or more and 40 micrometers or less. Muddy water that is clay and contains these solid contents can be used as a face stabilizer for stabilizing the face when excavating the natural ground.
[0078]
In the first muddy water supply step, muddy water containing a solid content less than the third particle size discharged as an overflow from the concentrated cyclone 13 in the concentration step is supplied to the injection unit 5. Thereby, the muddy water can be used as a treatment liquid. By reusing muddy water in this way, the amount of muddy water to be discarded is reduced, the amount of waste generated when excavating natural ground is reduced, and the amount of processing liquid excluding muddy water to be reused is reduced. Or can be eliminated.
[0079]
In the second muddy water supply step, muddy water containing solid content of less than the fourth particle size discharged as an overflow from the classification cyclone 15 in the centrifugal classification step is supplied to the excavator. Such a solid content of less than the fourth particle size is the above-mentioned silt and clay, and these solid contents are suitable as a face stabilizer for stabilizing the face when excavating the natural ground. By reusing muddy water in this way, the amount of muddy water to be discarded can be reduced, and the amount of waste generated when excavating natural ground can be reduced, and the face stabilizer that excludes muddy water to be reused Can be reduced or eliminated.
[0080]
In the dehydration step, the muddy water containing the solid content of less than the fourth particle size discharged as an overflow from the classification cyclone 15 in the centrifugal classification step is dehydrated. As a result, it is possible to further reduce the amount of waste by removing moisture from the waste generated when excavating the natural ground.
[0081]
The specific numerical values shown in the waste mud reuse system 1, 1 </ b> A and the waste mud reuse method described above are examples, and may be appropriately changed according to the particle size of the solid content to be separated.
[0082]
In the waste mud reuse system 1, 1 </ b> A and the waste mud reuse method, the first upstream vibrating sieve 6, the first downstream vibrating sieve 7, the second vibrating sieve 11, and the third vibrating sieve 16 have through holes with a predetermined inner diameter. However, the present invention is not limited to such a vibrating screen. Instead of the vibration sieve, for example, it has a drum portion that is formed in a generally cylindrical shape and is formed with a through hole having a predetermined inner diameter that communicates the inner space with the outer space. The device may be configured to rotate in the same manner.
[0083]
In the waste mud reuse system 1, 1 </ b> A and the waste mud reuse method, the secondary treatment device 3 is configured to include the adjustment tank 14, but may be configured not to include the adjustment tank 14. In this case, the muddy water containing the solid content of less than the third particle size discharged as an overflow from the concentrated cyclone 13 is given to the injection unit 5 and the classification cyclone 15.
[0084]
Further, in the waste mud reuse system 1, 1A and the waste mud reuse method, the mud containing solid content of less than the fourth particle size discharged as an overflow from the classified cyclone 15 to be supplied to the excavator as a face stabilizer, Mica (mica) may be mixed as a clogging material. As a result, when excavating the natural ground by the excavator, the risk of muddy water overflowing into the natural ground and the natural ground collapsing is reduced as much as possible, and the first upstream vibration sieve 6, the first downstream vibration sieve 7, The clogging of each mesh portion of the second vibrating sieve 11 and the third vibrating sieve 16 can be prevented.
[0085]
【The invention's effect】
According to the first aspect of the present invention, the solid content of the first particle size or more contained in the waste mud is efficiently and reliably separated from the remaining solid content by the jet of the treatment liquid and the first vibrating sieve. Can do.
[0086]
  AlsoThe solid content of the second particle size or more, the solid content of the third particle size or more, the solid content of the fourth particle size or more, and the solid content of the fifth particle size or more contained in the muddy water are reliably and efficiently separated from the muddy water. Thus, the mud can be made to contain only a solid content less than the fourth particle size.
[0087]
  Claim2According to the described invention, by reusing muddy water, the amount of muddy water to be discarded is reduced, the amount of waste generated when excavating a natural ground is reduced, and the muddy water to be reused is removed. The amount of liquid can be reduced or eliminated.
[0088]
  Claim3According to the described invention, by reusing muddy water, it is possible to reduce the amount of muddy water to be discarded, and to reduce the amount of waste generated when excavating natural ground, and to recycle muddy water. The amount of face stabilizer except for can be reduced or eliminated.
[0089]
  Claim4According to the described invention, it is possible to further reduce the amount of waste by removing moisture from the waste generated when excavating the natural ground.
[0090]
  Claim5According to the described invention, the solid content of the first particle size or more contained in the waste mud can be efficiently and reliably separated from the remaining solid content by the injection of the treatment liquid and the first vibrating sieve.
[0091]
  AlsoThe solid content of the second particle size or more, the solid content of the third particle size or more, the solid content of the fourth particle size or more, and the solid content of the fifth particle size or more contained in the muddy water are reliably and efficiently separated from the muddy water. Thus, the mud can be made to contain only a solid content less than the fourth particle size.
[0092]
  Claim6According to the described invention, by reusing muddy water, the amount of muddy water to be discarded is reduced, the amount of waste generated when excavating a natural ground is reduced, and the muddy water to be reused is removed. The amount of liquid can be reduced or eliminated.
[0093]
  Claim7According to the described invention, by reusing muddy water, it is possible to reduce the amount of muddy water to be discarded, and to reduce the amount of waste generated when excavating the natural ground, and to recycle muddy water. The amount of face stabilizer except for can be reduced or eliminated.
[0094]
  Claim8According to the described invention, it is possible to further reduce the amount of waste by removing moisture from the waste generated when excavating the natural ground.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of a mud soil reuse system 1 and a muddy water flow according to an embodiment of the present invention.
FIG. 2 is a diagram schematically showing a configuration of a mud mud reuse system 1A and a muddy water flow according to another embodiment of the present invention.
FIG. 3 is a flowchart showing a procedure of a waste mud reuse method using the waste mud reuse system 1 shown in FIG. 1;
[Explanation of symbols]
1,1A Waste mud reuse system
2 Primary processing equipment
3 Secondary processing equipment
5 Injection section
6 First upstream vibrating sieve
7 First downstream vibrating sieve
11 Second vibrating sieve
13 Concentrated cyclone
15 classification type cyclone
16 Third vibrating sieve
19 First supply section
23 Second supply section
30 Dehydrator

Claims (8)

Spraying means for injecting the treatment liquid into the mud from the excavator that excavates the ground, and turning the mud into fluid mud,
Have a primary processing device and a first vibration sieve solids of the less than 1 particle diameter predeterminable passable contained in the mud,
A second vibrating sieve that is capable of passing a solid content less than a second particle size smaller than the first particle size contained in the muddy water that has passed through the first vibrating sieve of the primary treatment device;
The muddy water that has passed through the second vibrating sieve is concentrated by centrifugation to a solid content greater than or equal to the third particle size smaller than the second particle size, and discharged separately from the solid content less than the third particle size. A concentrated cyclone
The muddy water containing solid content less than the third particle size discharged from the concentrated cyclone is centrifuged to obtain a solid content greater than or equal to the fourth particle size smaller than the third particle size and a solid content less than the fourth particle size. Classifying cyclones that are separated into separate and discharged separately;
The second particle size contained in the muddy water containing a solid content of the third particle size or more discharged from the concentrated cyclone and the muddy water containing a solid content of the fourth particle size or more discharged from the classification cyclone. A third vibrating sieve through which a solid content smaller than the fifth particle size can pass,
A waste mud reuse system, further comprising a secondary treatment device for circulating the muddy water that has passed through the third vibrating screen to the concentrated cyclone. Discharging mud recycling system according to claim 1, further comprising a first supply means for supplying muddy water, the injection means including solids smaller than the third particle size is discharged from the concentrate cyclone. The waste mud reuse system according to claim 1 or 2 , further comprising a second supply means for supplying the excavator with muddy water containing solids less than the fourth particle size discharged from the classified cyclone. . The waste mud reuse system according to any one of claims 1 to 3 , further comprising a dewatering means for dewatering muddy water containing solids less than the fourth particle size discharged from the classified cyclone. A fluidizing step of injecting the treatment liquid into the drained mud from the excavator that excavates the natural ground using the jetting means to turn the mud into a fluid mud,
Using a first vibrating sieve through which a solid content less than a predetermined first particle size can pass, the solid content contained in the muddy water is a solid content less than a predetermined first particle size and greater than or equal to the first particle size. the first classification step to be separated into a solid look including,
After the first classification step, using a second vibrating sieve through which the solid content of the second particle size smaller than the first particle size can pass, the solid content less than the first particle size contained in the muddy water, A second classification step for separating the solid content less than the second particle size smaller than the first particle size into the solid content greater than the second particle size;
Using a concentrated cyclone, out of the solid content less than the second particle size contained in the muddy water, the solid content not less than the third particle size smaller than the second particle size is concentrated by centrifugation, and the first A concentration step of discharging separately from the solid content of less than 3 particle sizes;
Using a classification type cyclone, a solid content less than the third particle size contained in the mud discharged from the concentrated cyclone is solidified by a centrifugal separation with a solid content not less than the fourth particle size smaller than the third particle size. A centrifugal classification step of separating and solidly discharging the solids having a particle size of less than the fourth particle size;
Using a third vibrating sieve capable of passing a solid content having a fifth particle size smaller than the second particle size, the solid content having a particle size equal to or greater than the third particle size contained in the muddy water discharged from the concentrated cyclone, and A third component that separates the solid content greater than or equal to the fourth particle size discharged from the classified cyclone into a solid content less than the fifth particle size smaller than the second particle size and a solid content greater than the fifth particle size. A classification process;
A method for recycling mud soil, further comprising a circulation step of circulating the mud containing solid content less than the fifth particle size to the concentrated cyclone. The waste mud reuse method according to claim 5 , further comprising a first mud water supplying step of supplying mud water containing solid content less than the third particle diameter discharged from the concentrated cyclone to the injection means. The waste mud reuse according to claim 5 or 6 , further comprising a second mud supply step for supplying mud containing solid content less than the fourth particle size discharged from the classified cyclone to an excavator. Method. The method for reusing mud soil according to any one of claims 5 to 7 , further comprising a dehydrating step of dewatering muddy water containing solids having a particle size of less than the fourth particle size discharged from the classified cyclone.

Images