JPH11152981A - Slurry property measuring system, its method, muddy water processing system, and method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and method for measuring slurry property and muddy water processing and method using them measuring a classifying amount of concentrated slurry obtained by classifying slurry being an object by a concentration cyclone and controlling the classifying amount of the concentrated slurry. SOLUTION: A measuring pipe 160 for measuring the property of concentrated slurry transmitted from a concentration cyclone for slurry processing, a flow rate measuring means for measuring the flow rate of the concentrated slurry, a pressure difference hydrometer 74 (74-1, 74-2) for detecting the specific gravity of the concentrated slurry, an actuator 120 for opening and closing the lower end of the measuring pipe 160, and a controller 110 for controlling the actuator 120 are provided. A sensor 82 for detecting accumulation of the concentrated slurry up to a measuring completion position, an accumulation time measuring device, a flow rate arithmetic device and a pressure difference arithmetic device are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a slurry property measuring system and method, and a muddy water treatment system and method using the same.

[0002]

BACKGROUND ART Conventionally, muddy water treatment systems have been widely used in various fields. In particular, in the field of the muddy water method, for example, in a shaft excavation method using a stabilizing liquid, a muddy water shield method, or the like, it is used to treat slurry as muddy water used for construction. Here, the slurry is a liquid in which water and fine particles are mixed, and includes a stable liquid for the underground continuous wall and muddy water in a muddy water shield method or the like.

[0003] Since such a muddy water treatment system is usually provided on the ground, a layout with a small installation space and a flexible layout is required due to restrictions on the site site, and the muddy water from the construction site is efficiently removed. Processing ability is also required.

[0004] For example, when excavating a face using a muddy shield machine, the mud used for stabilizing the face in the muddy shield machine becomes a slurry mixed and stirred with the excavated earth and sand, and the muddy water treatment equipment on the ground is used. Sent back to In the muddy water treatment facility, as described above, after separating and removing the earth and sand components from the returned slurry, necessary components are adjusted, and the slurry is again sent to the shield machine.

[0005] The above-mentioned muddy water treatment equipment usually includes a primary treatment equipment and a secondary treatment equipment.

[0006] The slurry sent to the ground from the muddy shield machine is sent to a regulating tank after sand, gravels and the like having a particle size of 74 µm or more are removed by a vibrating sieve and a liquid cyclone in a primary treatment facility. On the other hand, earth and sand such as sand and gravel removed in the primary treatment facility are stored in a hopper via a belt conveyor, and are carried out as dumping by a dump truck or the like.

[0007] The slurry sent to the adjusting tank is subjected to component adjustment such as density adjustment by addition of a thickener or the like by a mud making facility or supply of water from a fresh water tank, and then the slurry is fed to a slurry feeding pipe. Again sent to the shield machine.

[0008] When adjusting the components in such an adjusting tank, if the specific gravity of the slurry in the adjusting tank is high, it is necessary to dilute the slurry, resulting in excessive slurry.
This excess slurry is stored in a surplus mud tank as surplus mud. This excess mud is treated in a secondary treatment facility,
The silt clay is separated into water and other silt clay components, and the separated silt clay is supplied to the hopper in a modified state.
The earth and sand stored in the hopper is discharged as dump soil by a dump truck or the like, and is carried out to an intermediate waste treatment plant or the like.

Conventionally, in this secondary treatment facility, a coagulant is added to muddy water extracted from an excess muddy water layer, and the coagulant is compressed at an extremely high pressure by a filter press to separate water and other sediment components. Was. Then, the separated water was discharged through a tertiary treatment facility, and the sediment component was carried out in a hardened state, and was carried into a hopper by a belt conveyor.

However, in such a method using a filter press, since the slurry as surplus mud must be compressed at an extremely high pressure, the filter press itself must have a very high mechanical strength. For this reason, the whole system becomes large and expensive.

[0011] In order to solve such a problem, there is proposed a muddy water treatment facility for condensing a slurry as surplus muddy water by using a liquid cyclone in a secondary treatment facility, and modifying the concentrated slurry by adding a modifier. Has also been made.

However, a cyclone used for classifying muddy water having a small particle size such as silt or clay is required to be small and to be accurately controlled. For this reason, the muddy water treatment equipment according to this proposal is provided with a device for detecting the specific gravity of the slurry supplied to the cyclone, and is configured to control the throttle opening of the apex valve of the cyclone based on the detected specific gravity.

However, even when the slurry to be treated has the same specific gravity, if the component ratio of silt or clay contained therein is completely different, the opening of the apex valve is simply adjusted based on the specific gravity of the slurry to be treated. However, there is a problem that a large variation occurs in the classification amount of the obtained concentrated slurry only by performing the method.

That is, it is preferable to control the opening degree of the apex valve so as to concentrate the concentrated slurry to a specific gravity as high as possible. However, when the amount of fine particles in the slurry component increases, the classification amount of the concentrated slurry is almost not obtained. However, there is a problem that it is difficult to perform an appropriate secondary process in the opening control that emphasizes specific gravity. That is, since the excavation amount and the secondary processing amount cannot be balanced, in the worst case, a situation occurs in which the shield work must be temporarily stopped.

A first object of the present invention is to provide a muddy water state measuring system capable of continuously and accurately measuring the classification amount and specific gravity of a concentrated slurry obtained by classifying a slurry to be treated by a liquid cyclone. And a method.

A second object of the present invention is to provide a muddy water treatment system and method capable of controlling a liquid cyclone device based on the obtained properties of a slurry and accurately classifying the slurry.

[0017]

According to one aspect of the present invention, there is provided a measuring flow path formed so that a concentrated slurry sent from a hydrocyclone apparatus for slurry processing flows downstream by its own weight. Flow path opening and closing means for opening and closing the downstream side of the measurement flow path, control means for controlling the flow path opening and closing means, and the measurement flow path is closed by closing the measurement flow path by the flow path opening and closing means. Accumulation time measuring means for measuring the accumulation time in which the concentrated slurry is accumulated from a predetermined measurement start position in the road to a predetermined measurement end position on the upstream side; and calculating the flow rate of the concentrated slurry based on the accumulation time. Flow rate calculating means.

Here, the concentrated slurry is a slurry classified (concentrated) by a liquid cyclone or the like.
Compared to the slurry before classification, the slurry has a higher density and lower fluidity but is not lost. Since the concentrated slurry has such properties,
It is extremely difficult to measure its properties.

According to the present invention, by concentrating the concentrated slurry flow path and accumulating the concentrated slurry, the concentrated slurry in the measurement flow path from the closed position to the measurement end position is in a state where no air is mixed, and the homogeneous slurry is homogenized. Things. Since the measurement can be performed in this homogeneous state, the flow rate of the concentrated slurry having fluidity and difficult to measure can be accurately measured.

In addition, since the liquid is accumulated by its own weight, accurate measurement can be performed without changing the properties of the concentrated slurry, as compared with the case of pressure feeding using a machine.

According to a second aspect of the present invention, in the first aspect, there is provided a measurement end detection sensor for detecting that the concentrated slurry has accumulated up to the measurement end position, and the measurement start position is determined by the measurement flow. It is characterized in that it is set at a road opening / closing position.

According to the present invention, since the closing of the measurement channel can be used as the timing for starting the measurement, a property measurement system that can be easily controlled can be realized.

According to a third aspect of the present invention, in the first aspect, a measurement start detection for detecting that the concentrated slurry has accumulated up to the measurement start position set upstream of the open / close position of the measurement flow path. A sensor, and a measurement end detection sensor for detecting that the concentrated slurry has accumulated up to the measurement end position.

According to the present invention, the concentrated slurry is closed and the concentrated slurry is accumulated, so that the concentrated slurry in the measuring flow path from the closing point to the measurement end position is in a state where no air is mixed, and a uniform slurry is obtained. Things. Since the measurement can be performed in this homogeneous state, the flow rate of the concentrated slurry having fluidity and difficult to measure can be accurately measured. In addition, since the start and end timings of the measurement are detected by the sensor, accurate measurement can be performed, and measurement accuracy of the flow rate of the concentrated slurry can be improved.

Further, the invention described in claim 4 is the same as that in claim 1
3. In any one of 3., the opening / closing means may open / close an end on the downstream side of the measurement flow path.

According to the present invention, since the end is opened and closed, the opening and closing can be performed easily and in a short time as compared with the case of opening and closing the mid-abdomen, and continuous measurement can be performed.

Further, the invention according to claim 5 is the same as that of claim 1.
In any one of the above items 4, the measurement flow path is formed in a vertical direction.

According to the present invention, when the measurement flow path is opened by the flow path opening / closing means, the measurement flow path is formed in the vertical direction. In addition, it can be sent out without adhering or remaining in the flow path. Since the old concentrated slurry does not remain, the property of the newly sent concentrated slurry can be accurately measured in the next measurement.

In the case of classifying using a plurality of cyclones, it is preferable that the concentrated slurry is sent to a vertically formed measurement flow path via a hopper. This allows continuous and accurate measurement even when a plurality of cyclones are operated in parallel.

Further, the invention according to claim 6 is the same as
In any one of 5, the specific gravity detecting means is provided in the measurement flow path upstream of the open / close position and downstream of the measurement end detection position, and detects specific gravity of the concentrated slurry, and specific gravity detection by the specific gravity detection means Specific gravity calculating means for calculating the specific gravity of the concentrated slurry based on the result.

According to the present invention, the specific gravity of the concentrated slurry can be simultaneously measured at the timing of measuring the flow rate, so that an efficient property measurement can be performed. In addition, you may form so that density may be measured instead of specific gravity.

According to a seventh aspect of the present invention, in the sixth aspect, the specific gravity detecting means includes a differential pressure hydrometer having a plurality of pressure detectors arranged at different positions in contact with the measurement flow path. It is characterized by comprising.

According to the present invention, since the differential pressure hydrometer is used, the specific gravity of the highly viscous concentrated slurry can be measured accurately and at low cost.

According to an eighth aspect of the present invention, in the seventh aspect, a cleaning means for cleaning the plurality of pressure detecting units is provided.

According to the present invention, the concentrated slurry adhering to the pressure detecting section can be removed by cleaning, and accurate measurement can be performed at the next measurement.

The ninth aspect of the present invention is the first aspect of the present invention.
8. In any one of the above 8, further comprising a throttle opening control means for controlling a throttle opening of the liquid cyclone device based on at least one measurement result of a flow rate or a specific gravity of the slurry obtained by the slurry property measuring system, It is characterized in that the slurry supplied to the cyclone is concentrated for slurry reforming.

Here, the term “modification” means that the surface potential of the fine particles is neutralized by the coagulation action, the particles are easily bonded to each other, and the cross-linking adsorption action by hydrogen bonding or the like due to the functional group of the polymer causes an apparent change. Means that the particles are coarsened.
As the concentrated slurry is modified, the apparent particle size becomes larger and the fluidity is lost.

According to the present invention, the amount of classification of the concentrated slurry can be controlled to a desired value by controlling the degree of opening of the liquid cyclone device based on at least one of the measurement results of the flow rate and the specific gravity of the slurry. can do. Further, even if the component ratio of the slurry supplied to the hydrocyclone device changes abruptly, a stable amount of concentrated slurry can be obtained from the hydrocyclone device.

The invention according to claim 10 is the invention according to claim 9
In the throttle opening control means, when the classification amount of the concentrated slurry classified by the liquid cyclone device is a predetermined amount or more, the throttle opening degree so that the concentrated slurry to be classified satisfies the optimum specific gravity condition. Specific gravity priority control, when the classification amount of the concentrated slurry to be classified in the liquid cyclone device is a predetermined amount or less, the classification amount of the concentrated slurry to be classified within the range that satisfies the permissible specific gravity conditions, so that the classification amount is increased. The throttle opening is subjected to flow priority control.

According to the present invention, when the classification amount of the concentrated slurry can be sufficiently ensured, specific gravity priority control for controlling the specific gravity of the concentrated slurry to an optimum value is performed so that the reforming process in the subsequent step can be performed well. In addition, when the classification amount of the concentrated slurry cannot be sufficiently secured, from the specific gravity priority control of the concentrated slurry,
The control is switched to the flow rate priority control in which the amount is prioritized.

Thus, it is possible to realize a muddy water treatment system in which the specific gravity control for satisfactorily reforming the concentrated slurry and the flow rate control for ensuring an appropriate amount of muddy water treatment can be performed in a well-balanced manner. It becomes possible. Here, the optimum specific gravity condition means a specific gravity value suitable for reforming with a specific gravity of 1.4 or more.

The invention according to claim 11 is the first invention.
In any one of to 10, the liquid cyclone device is provided in a secondary treatment facility for wastewater generated by a muddy water method, and classifies a secondary treatment slurry supplied from the primary treatment facility for wastewater, It is characterized in that the over muddy water is sent out to an adjustment tank or an excess muddy water tank.

According to the present invention, since it is not necessary to use an expensive filter press or the like as described above, the secondary treatment equipment used in the muddy water method can be made small and inexpensive.

The twelfth aspect of the present invention is the first aspect of the present invention.
1, the liquid cyclone device comprises a plurality of cyclones for classifying in parallel a secondary processing slurry from which components having a particle size of 74 μm or more have been removed by primary processing, and the classified concentrated slurry To the downstream slurry reforming apparatus.

It is necessary to use a small cyclone to separate and remove small-diameter sediment components having a diameter of 74 μm or less. Although a single cyclone cannot sufficiently secure the classification amount of the concentrated slurry, according to the present invention, a plurality of cyclones are used. Therefore, the classification amount of the concentrated slurry generated in the muddy water method can be sufficiently secured, and the muddy water treatment can be continuously performed by the reformer.

The thirteenth aspect of the present invention provides the ninth aspect.
In any one of the above items (1) to (12), the throttle opening control means includes:
A storage means for storing a path excavated by the muddy water method into a density priority path and a flow rate priority path based on geological survey data obtained in advance, and storing the classified path; For the slurry for use, the throttle opening of the liquid cyclone device is controlled with specific gravity priority so that the concentrated slurry to be classified satisfies the optimum specific gravity condition, and the secondary processing slurry obtained by excavating the flow rate priority path is Preferably, the throttle opening of the liquid cyclone apparatus is controlled so that the amount of classification increases within a range in which the flow rate of the concentrated slurry to be classified satisfies the allowable specific gravity condition.

As described above, the paths excavated by the muddy water method are classified and stored in advance into the density priority path and the flow rate priority path, so that the specific gravity priority control and the quantity priority control for the slurry for secondary treatment can be performed. Switching can be performed more accurately.

Further, in the method for measuring slurry properties according to claim 14, the downstream side of the flow path of the concentrated slurry sent from the liquid cyclone apparatus for slurry treatment is closed by a flow path opening / closing means, An accumulation time measurement step of measuring the accumulation time in which the concentrated slurry has been accumulated from a predetermined measurement start position in the upstream to a predetermined measurement end position in the upstream,
A flow rate calculating step of calculating a flow rate of the concentrated slurry based on the accumulation time; and a step of opening a downstream side of the concentrated slurry flow path by the flow path opening / closing means.

According to the present invention, by concentrating the concentrated slurry flow path and accumulating the concentrated slurry, the concentrated slurry in the measurement flow path from the closing point to the measurement end position is free from air entrainment, and the uniform slurry is obtained. Things. Since the measurement can be performed in this homogeneous state, the flow rate of the concentrated slurry having fluidity and difficult to measure can be accurately measured.

The invention according to claim 15 is the first invention.
4, a pressure detecting step of detecting the pressure of the concentrated slurry by a plurality of pressure detecting units provided at different positions in the concentrated slurry flow path, and a differential pressure calculation of calculating a differential pressure based on the pressure detection result And a step.

According to the present invention, the specific gravity of the concentrated slurry can be simultaneously measured at the timing of measuring the flow rate, and the property can be measured efficiently. Further, since the specific gravity is calculated based on the differential pressure, the specific gravity of the concentrated slurry having high viscosity can be measured accurately and at low cost. In addition, you may form so that density may be measured instead of specific gravity.

The invention according to claim 16 is the first invention.
5 is characterized by having a cleaning step of cleaning the plurality of pressure detection units.

According to the present invention, the concentrated slurry adhering to the pressure detecting section can be removed by cleaning, and accurate measurement can be performed at the next measurement.

The invention according to claim 17 is based on claim 1.
A throttle opening control step of controlling the throttle opening of the liquid cyclone apparatus based on at least one measurement result of the flow rate or specific gravity of the slurry obtained by using the slurry property measuring method described in any of 4 to 16; And a concentrating step of concentrating the slurry supplied to the liquid cyclone for slurry reforming.

According to the present invention, the amount of classification of the concentrated slurry is controlled to a desired value by controlling the opening degree of the liquid cyclone device based on at least one measurement result of the flow rate or specific gravity of the slurry. can do. Further, even if the component ratio of the slurry supplied to the hydrocyclone device changes abruptly, a stable amount of concentrated slurry can be obtained from the hydrocyclone device.

The invention described in claim 18 is the first invention.
7, the throttle opening control step includes: when the classifying amount of the concentrated slurry classified by the hydrocyclone device is equal to or more than a predetermined amount, the throttle opening is controlled so that the concentrated slurry to be classified satisfies an optimum specific gravity condition. A specific gravity priority control step of performing specific gravity priority control, and when the classification amount of the concentrated slurry to be classified by the liquid cyclone apparatus is equal to or less than a predetermined amount, the classification amount within a range where the concentrated slurry to be classified satisfies the allowable specific gravity condition. And a flow-priority control step of performing flow-priority control of the throttle opening so that the flow rate increases.

According to the present invention, when the classification amount of the concentrated slurry can be sufficiently ensured, specific gravity priority control for controlling the specific gravity of the concentrated slurry to an optimum value is performed so that the reforming process in the subsequent step can be performed well. In addition, when the classification amount of the concentrated slurry cannot be sufficiently secured, from the specific gravity priority control of the concentrated slurry,
The control is switched to the flow rate priority control in which the amount is prioritized.

As a result, muddy water treatment can be performed in which the specific gravity control for satisfactorily modifying the concentrated slurry and the flow rate control for ensuring an appropriate amount of the muddy water treatment can be performed in a well-balanced manner. Here, the optimum specific gravity condition is
It means a specific gravity of 1.4 or more.

The invention according to claim 19 is the first invention.
In any one of Items 4 to 18, the liquid cyclone device is provided in a secondary treatment facility for a muddy water method, and a secondary treatment slurry from which a component having a particle size of 74 μm or more has been removed by primary treatment in parallel. It comprises a plurality of cyclones to be classified, and is characterized in that the classified concentrated slurry is sent to a downstream slurry reforming apparatus.

According to the present invention, since there is no need to use an expensive filter press or the like as described above, the secondary treatment equipment used in the muddy water method can be made small and inexpensive. In addition, it is necessary to use a small cyclone to separate and remove the small-diameter sediment component having a diameter of 74 μm or less, and a single cyclone cannot sufficiently secure the classification amount of the concentrated slurry. Since the classification process can be performed in parallel, the classification amount of the concentrated slurry of the wastewater generated by the muddy water method can be sufficiently secured, and the muddy water treatment can be continuously performed by the reformer.

[0061]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments utilizing a muddy water treatment system according to the present invention will be described below in detail with reference to the drawings, taking a muddy water shield method as an example.

(Explanation of the whole muddy water shield method) FIG.
Shows a muddy water shield construction method to which the present invention is applied. The muddy water shield method uses a shield machine 34 and a mud feed system 4
3, the mud drainage system 47, and the muddy water treatment equipment 30.

The muddy water sent from the muddy water treatment equipment 30 to the shield chamber 42 inside the shield machine 34 via the mud feeding system 43 and used to stabilize the face 46 was mixed with the excavated earth and sand in the shield chamber 42 by stirring. The slurry is returned to the muddy water treatment facility 30 via the sludge drainage system 47. In the muddy water treatment equipment 30, earth and sand and the like are classified from the returned slurry, necessary components are adjusted, and then sent out to the shield machine 34 again.

The muddy water treatment equipment 30 includes the primary treatment equipment 26
, Secondary treatment equipment 28, adjustment tank 3, excess muddy water tank 12
It is comprised including.

The slurry sent back from the sludge drainage system 47 to the muddy water treatment equipment 30 is subjected to classification in the primary treatment equipment 26 such as sand and gravel having a particle diameter of 74 μm or more contained in the slurry and sent to the adjusting tank 3. Can be In the adjustment tank 3, the slurry is sent to the mud feeding system 43 after its properties are adjusted. When adjusting the properties, part of the slurry in the adjustment tank 3
It is sent to the surplus mud tank 12. The slurry sent to the surplus mud tank 12 is sent to the secondary treatment facility 28 to classify silt clay having a size of less than 74 μm, and the classified slurry is sent back to the surplus mud tank 12 to be circulated and classified. It is to be noted that the classification may be sent cyclically from the adjustment tank 3 to the secondary processing equipment 28 and classified.

The primary treatment equipment 26 is provided with a liquid cyclone 17
, Vibrating sieve 4, belt conveyor 8, hopper 13
It is comprised including.

From the sludge discharge system 47, the primary treatment equipment 26
Is circulated and classified by the vibrating sieve 4 and the liquid cyclone 17 to remove soil and the like of 74 μm or more. The slurry from which the soil and the like have been removed is sent to the adjusting tank 3. On the other hand, the classified earth and sand of 74 μm or more is put into the hopper 13 via the belt conveyor 8, temporarily stored, and then carried by the dump truck 150 to the disposal site.

The secondary treatment facility 28 includes a concentrated cyclone system 140, a concentrated slurry tank 20, and a slurry transport and reforming system 142.

The silt clay having a particle size of less than 74 μm and the like that cannot be classified by the primary treatment equipment 26 is classified by the concentrated cyclone system 140. Here, the concentrated cyclone is a liquid cyclone whose main purpose is to concentrate the slurry. The slurry that has been classified as over muddy water is sent back to the surplus muddy water tank 12 and is classified cyclically. On the other hand, the concentrated slurry concentrated as under muddy water is sent to the concentrated slurry tank 20. Further, after being sent from the concentrated slurry tank 20 to the slurry transport / reforming system 142 for reforming, it is transported by the dump truck 152 to an intermediate waste treatment plant or the like.

(Description of Concentrating Cyclone Device) FIG. 2 is a schematic diagram of the condensing cyclone device 18 included in the condensing cyclone system 140. The concentration cyclone device 18
In order to efficiently process the small diameter slurry, a plurality of, for example, 12 concentrated cyclone devices 18-1 to 18-12 as shown in FIG. The slurry is pressurized by the cyclone pump 90 from the excess muddy water tank 12 and
0 and is supplied to the concentration cyclone device 18.

As shown in FIG. 2A, a pipe 22 between the cyclone pump 90 and the condensing cyclone device 18 is provided.
A strainer 100 is provided on the upper side of the cylinder 0, and when the slurry is supplied to the concentration cyclone device 18, the soil particles having a particle diameter of 1.5 mm or more are removed by the strainer 100.

The slurry supplied to the condensing cyclone device 18 is classified by the centrifugal action of the cyclone.
Sent to On the other hand, the slurry having a large particle size
0 to the concentrated slurry tank 20.

The 12 concentrated cyclone devices 18-
All the concentrated slurries discharged from 1 to 12 are collected in one hopper 15 and supplied to the concentrated slurry tank 20 through the measuring pipe 160. The concentrated slurry tank 20 may have any shape, may be provided separately, or may be provided at the bottom of the shaft 40. Also in the case where the concentrated slurry is provided at the bottom of the shaft 40, the concentrated slurry is in a fluid state, and thus can be sent to the slurry transport reforming system 142 on the ground through a pipe or the like, and the area of the ground processing equipment can be reduced.

FIG. 3 shows a cross-sectional view of each enrichment cyclone device 18. The condensing cyclone device 18 includes an inflow pipe 130 into which the supply slurry flows from the pipe 220, and an upstream pipe 132 connected to the pipe 222 to discharge the over muddy water.
The inflow pipe 130 is connected to the side and the upstream pipe 13 is
2, a conical portion 138 connected to a lower portion of the cylindrical portion 136, a downstream pipe 134 connected to a lower portion of the conical portion 138, and through which the concentrated slurry is sent out via a pipe 224. It is comprised including. The downstream pipe 134 is provided with an apex valve 86 so that the properties of the concentrated slurry can be adjusted.

The slurry sent from the excess mud tank 12 to the secondary treatment equipment 28 is pressurized by the cyclone pump 90 and supplied to the condensing cyclone device 18 through the pipe 220. This slurry is called the feed slurry. The strainer 100 is provided on the pipe 220, and those having a large particle size in the slurry are removed from the slurry by the strainer 100.

The feed slurry is supplied to the condensing cyclone device 18.
Those having a small particle diameter, which are centrifuged inside,
2 and is sent to the surplus mud tank 12 through the pipe 222. This mud is called over mud. Excess mud tank 1
The mud sent to 2 is sent to the adjusting tank 3 for circulation. The slurry may be sent from the adjusting tank 3 to the concentration cyclone system 140 and returned to the adjusting tank 3 for circulating use.

On the other hand, those having a large particle diameter have a conical portion 138.
It is collected and concentrated below the inside, supplied to the hopper 15 through the downstream pipe 134, and supplied to the measuring pipe 1 through the pipe 224.
It is sent to the concentrated slurry tank 20 via 60. This slurry is called a concentrated slurry. The concentrated slurry sent to the concentrated slurry tank 20 is supplied to the slurry transport reforming system 142.
Sent to

The concentrated slurry sent to the slurry transport / reforming system 142 is added with a modifier and a stabilizer, is stirred, and is reformed immediately before the outlet of a mixer, which is a reforming flow path. It is transported to an intermediate treatment plant for industrial waste.

The modifier is not particularly limited as long as it is an acrylic modifier such as acrylamide or sodium acrylate, but acrylamide is preferred. When an acrylic modifier is used, the acrylic component, which is the main component of the polymer modifier, is dissolved in water contained in the concentrated slurry,
The acrylic modifier is adsorbed on the soil particles in the concentrated slurry to cause a cross-linking adsorption action. By adding this modifier to the mud, the soil particles become apparently coarse particles, and most of the water in the concentrated slurry is trapped between the coarse particles, so that the mud loses fluidity and aggregates. (Reformed) state.

Further, the addition of the modifying agent can be performed in a much smaller amount than in the past, the time required for the reforming is about ten and several seconds, and the modified mud can be carried out by the dump truck 152. It also has the effect of shortening the muddy water treatment time, preventing waste of resources and reducing costs.

In addition, by adding a stabilizer to the concentrated slurry, stable properties can be maintained after the reforming and transportation to an intermediate waste treatment plant or the like. At the time of adding the stabilizer, the concentrated slurry is stirred by the mixer and is in a homogeneous state and a fluidized state, so that the stabilizer can be favorably added. As the stabilizer, a lime-based or cement-based stabilizer is desirable.

Conventionally, large-scale muddy water treatment equipment such as a filter press is required for the reforming, and it takes many hours to reform the concentrated slurry. Transportation had to be carried out, which was very costly. According to the present embodiment, since the reforming can be performed in only ten and several seconds, the muddy water treatment time can be shortened, and the dump truck 152 can be continuously loaded on the inexpensive treatment truck, so that the cost can be reduced.

(Description of Measurement of Specific Gravity of Concentrated Slurry and its Control) The flow of the slurry is as described above. The flow of the measurement of the properties of the slurry in the concentrated cyclone system 140 and the control thereof will be described below.

FIG. 4 is a functional block diagram showing the conventional control of the specific gravity of the concentrated slurry. Conventionally, the specific gravity of the supplied slurry is measured by a densitometer 72 provided in a path between the cyclone pump 90 and the condensing cyclone device 18,
The measurement data is sent to the cyclone control device 110, and the cyclone control device 110 controls the apex valve 86 based on the measurement data. This control is performed according to the specific gravity of the supplied slurry.
The throttle is changed to control the specific gravity of the concentrated slurry to be constant.

However, as described above, the excess mud tank 12
As shown in FIG. 5, when the slurry is supplied to the concentration cyclone device 18 cyclically from
The specific gravity of the feed slurry immediately after the start of the classification process at 1.2 was 1.2
7, the specific gravity of the concentrated slurry is 1.66, the specific gravity of the supplied slurry is 1.21 and the specific gravity of the concentrated slurry is 1.46 in the measurement 40 minutes after the start of the classification, and the change amount of the supplied slurry is While it is 0.06, the change amount of the concentrated slurry is 0.20, which is three times different. As described above, when the change in the specific gravity of the concentrated slurry is large relative to the change in the supply slurry, even if the opening degree of the apex valve 86 is changed in accordance with the change in the specific gravity measured by the density meter 72, the concentrated slurry is not changed. Since it is significantly different from the change in specific gravity, it is extremely difficult to set the specific gravity of the concentrated slurry to a desired specific gravity of 1.4 or more, which is a specific gravity suitable for the reforming treatment.

In this embodiment, FIGS. 2A and 7
As shown in FIG. 3, the hopper 15, the measuring pipe 160, and the measuring pipe 160 are provided between the apex valve 86 and the concentrated slurry tank 20 so that the opening degree of the apex valve 86 can be changed according to the change in the specific gravity of the concentrated slurry. A differential pressure hydrometer 74 for measuring the specific gravity of the concentrated slurry in the inside, and a measuring tube 160
And an actuator 120 for closing the downstream end of the actuator.

The measurement of the specific gravity is specifically performed as follows. FIG. 6 shows a functional block diagram of specific gravity measurement control according to an example of the present embodiment.

First, the specific gravity of the slurry supplied to the concentrated cyclone device 18 is measured using the density meter 72. The throttle opening of the apex valve 86 is adjusted by the cyclone controller 110 based on the measured value.

Next, in order to correct and control the throttle opening of the apex valve 86, the specific gravity of the concentrated slurry sent from the concentration cyclone device 18 is measured. In this embodiment, from the measurement start position SP1 to the measurement end position EP1 in a state where the concentrated slurry is filled in the measurement flow path from the closed position upstream of the measurement flow path as the measurement start position SP1 to the predetermined measurement end position EP1. The specific gravity measurement is performed using a differential pressure hydrometer 74 provided in the measurement flow path during the measurement.

First, the hemispherical rubber ball 122 comes into contact with the downstream end of the measuring tube 160 and is closed by the actuator 120, and the concentrated slurry accumulates in the measuring tube 160.

Next, the sensor 82 that detects the measurement end position EP1 detects that the concentrated slurry has accumulated up to the measurement end position EP1 near the upstream end of the measurement tube 160. In this state, 2 inside the measuring tube 160
The portion where the two pressure detecting portions are in contact is in a state where the concentrated slurry is homogeneous.

Since the differential pressure of the concentrated slurry is measured in a homogeneous state, accurate measurement results can be obtained. This measurement result is sent to the specific gravity calculation device 84, where the specific gravity is calculated.
Based on the calculation result, the throttle opening of the apex valve is corrected and controlled.

By using the differential pressure hydrometer 74 in this way, the specific gravity of a highly viscous concentrated slurry can be accurately and inexpensively measured.

As shown in FIG. 7A, the differential pressure hydrometer 74
Is configured to include a plurality of, for example, two pressure detecting units 74-1 and 74-2 arranged at different positions of the measuring tube 160.

FIG. 7B is a sectional view taken along the line BB of FIG. 7A. The two pressure detecting units 74-1 and 74-2 are connected to the measuring tube 1
60 includes a concave pressure-sensitive portion in contact with the concentrated slurry. According to this, the pressure can be concentrated at one point by using the concave shape, and the pressure can be accurately detected.

After the measurement, the downstream end of the measuring tube 160 is opened by the actuator 120, and the concentrated slurry is sent out from the measuring tube 160 to the concentrated slurry tank 20 by its own weight.

A specific control flow based on the specific gravity measurement result obtained as described above is as follows. The specific gravity measurement result is sent to the cyclone control device 110.

The cyclone control device 110 controls the apex valve 86 by setting the optimum aperture of the apex valve 86 based on the measurement result and comparing the measured value with a predetermined reference value stored in advance.

The specific gravity of the concentrated slurry discharged from the condensing cyclone device 18 and temporarily stored in the hopper 15 is measured by a differential pressure hydrometer 74 provided in a measuring pipe 160 immediately below the hopper 15. It is sent to the cyclone controller 110.

The cyclone controller 110 corrects and controls the aperture of the apex valve 86 based on the specific gravity measurement data so that the concentrated slurry has a predetermined property.

That is, when the specific gravity is not sufficient, the aperture of the apex valve 86 is reduced, and when it exceeds the desired specific gravity, the aperture of the apex valve 86 is increased. Here, the desired specific gravity is preferably 1.4 or more.

As shown in FIG. 7 (A), the actuator 120 as the flow channel opening / closing means has a hemispherical rubber opening / closing portion having a hemispherical portion in contact with the downstream end of the measuring tube 160. The ball 122 is controlled. The hemispherical rubber ball 122 preferably has a hemispherical shape when the downstream end section of the measuring tube 160 is circular.
Various modifications are possible in accordance with the shape of.

The hemispherical rubber ball 122 in contact with the downstream end of the measuring tube 160 has elasticity, and has been subjected to a concentrated slurry adhesion preventing treatment such as Teflon processing. According to this, the downstream end of the measuring tube 160 can be hermetically sealed with a small force by making it hemispherical and having elasticity. In addition, since it has elasticity, it does not damage the end portion, and the concentrated slurry does not easily adhere, so that it can be accurately measured at the time of property measurement. Similarly, the hopper 15 and the measuring tube 160 are also subjected to the concentrated slurry adhesion preventing treatment, and the same effect can be obtained.

At the time of this specific gravity measurement, by closing the downstream end of the measuring tube 160, the air content contained in the concentrated slurry inside the measuring tube 160 provided with the differential pressure hydrometer 74 rises upward. Since the state of the concentrated slurry is homogenized by being dissipated, the specific gravity can be accurately measured. Although the middle part of the measuring tube 160 can be opened and closed by a valve, it is preferable to open and close the end part. By opening and closing the end, control for reliably opening and closing is easier than in the case of opening and closing the mid-abdomen, and continuous measurement can be performed.

When the specific gravity is measured by the differential pressure hydrometer 74, the measurement is performed in a state where the downstream end of the measurement tube 160 is closed by the actuator 120 provided at the downstream end of the measurement tube 160. . The downstream end of the measuring tube 160 is normally open and closed at the time of measurement.

Further, the measuring tube 160 is formed in a shape in which the concentrated slurry flows downstream by its own weight, but is preferably formed in a vertical direction. Since it flows downstream due to its own weight, the properties of the concentrated slurry are less likely to change than in the case of pressure feeding by a machine, and accurate measurement can be performed. further,
By forming the flow path in the vertical direction, when the end of the measurement tube 160 is opened by the actuator 120,
Since the measuring tube 160 is formed in the vertical direction, the measured concentrated slurry can be quickly sent out from the measuring tube 160 by its own weight without causing adhesion or remaining in the flow channel. Since the old concentrated slurry does not remain, the property of the newly sent concentrated slurry can be accurately measured in the next measurement.

Further, as shown in FIG. 2 (B), by providing a plurality of small diameter condensing cyclones and distributing them evenly, it is possible to make the supply slurry amount and the concentrated slurry amount in each condensing cyclone substantially equal. Since the classification of silt clay or the like having a small particle diameter of the soil particles can be performed in parallel, that is, efficiently, it is possible to classify the small-sized soil particles in a large amount and at a high speed. In this case, as shown in FIG. 2A, even if a plurality of concentrated cyclones are provided, the respective concentrated slurries are collected in the hopper 15, so that the processing after the hopper 15 is the same as that of the single concentrated cyclone. Since the conventional processing facility can be diverted, the processing facility area on the ground does not become larger than before.

When the classification treatment is performed by a single concentrated cyclone, the concentrated cyclone apparatus 1 is not provided without the hopper 15.
8 and the measuring tube 160 may be directly connected.

(Explanation of Measurement of Flow Rate of Concentrated Slurry and Its Control) As shown in FIG. 8, various excavated soil layers such as an alluvial cohesive soil layer and a dirt sandy soil layer exist in the tunnel excavation path. Therefore, as shown in FIGS. 9A to 9C,
Even if the aperture of the apex valve 86 is the same, the amount of concentrated slurry discharged differs depending on the soil.

Normally, it is preferable to control the opening of the apex valve so as to concentrate the concentrated slurry to a specific gravity as high as possible. However, when the fine particles are increased in the slurry component, the classification amount of the concentrated slurry is almost zero. Therefore, it is difficult to perform an appropriate secondary process in the opening control that emphasizes specific gravity. That is, since the excavation amount and the secondary processing amount cannot be balanced, in the worst case, a situation occurs in which the shield work must be temporarily stopped.

For this reason, it is necessary to treat the concentrated slurry not in terms of density but in terms of flow rate. However, since the concentrated slurry discharged from the condensing cyclone device 18 is discharged to the atmosphere, it is discharged by air mixing or the like. It is difficult to measure the quantity.

In this embodiment, a flow rate measuring device is provided in addition to the density measuring device such as the density meter 72, so that the amount of the concentrated slurry can be accurately obtained. The flow rate measuring device is configured to include a sensor for detecting the accumulation position of the concentrated slurry, an accumulation time measuring device for measuring the accumulation time, and a flow rate computing device for calculating the concentrated slurry flow rate based on the obtained accumulation time. .

The measurement of the flow rate is specifically performed as follows. FIG. 6 is a functional block diagram of the flow measurement control according to an example of the present embodiment. As shown in FIGS. 6 and 7 (A), the flow rate measurement of the concentrated slurry is performed in the same manner as the timing of the specific gravity measurement described above.

That is, when the flow rate of the concentrated slurry is measured, the hemispherical rubber ball 12 is
2 comes in contact with the downstream end of the measurement tube 160, which is the measurement start position SP1, and is closed, and the concentrated slurry accumulates in the measurement tube 160. The sensor 82 provided near the end of the measurement flow path on the upstream side of the open / close position of the measurement tube 160 detects that the concentrated slurry has accumulated up to the measurement end position EP1 near the end on the upstream side of the measurement tube 160. Is done. Since the volume of the measurement tube 160 is known, the measurement start position SP
The flow rate is obtained by calculating the time during which the concentrated slurry accumulates from 1 to the measurement end position EP1.

As shown in FIG. 7A, the detection portion of the sensor 82 is provided near the upstream end of the measuring tube 160. The accumulation time measuring device 162 and the flow rate calculating device 164 are connected to the cyclone control device 110 as shown in FIG.
Or may be provided separately.

In the state at the time of measurement, the concentrated slurry is in a uniform state in the measurement flow path up to the portion in contact with the sensor. The accumulation time from when the downstream end of the measurement tube 160 is closed to when the sensor 82 contacts the concentrated slurry is measured by the accumulation time measuring device 162. The flow rate calculator 164 calculates the flow rate of the concentrated slurry based on the accumulation time and the volume of the measurement flow path from the measurement start position SP1 to the measurement end position EP1.

This flow rate data is stored in the cyclone controller 1
The throttle opening of the apex valve 86 is corrected and controlled based on the measurement data. After the measurement, the downstream end of the measuring tube 160 is opened by the actuator 120, and the concentrated slurry is sent out from the measuring tube 160 to the concentrated slurry tank 20 by its own weight.

According to this, by closing the concentrated slurry flow path and accumulating the concentrated slurry, the concentrated slurry in the measurement flow path from the closing point to the measurement end position EP1 is kept free from air entrainment, and the uniform slurry is obtained. It can be. Since the measurement can be performed in this homogeneous state, the flow rate of the concentrated slurry having fluidity and difficult to measure can be accurately measured.

Further, a specific control flow using the flow rate measuring method of the concentrated slurry is as follows. As shown in FIG. 6, the cyclone control device 110 controls the apex valve 86 based on the measurement result of the concentrated slurry flow rate so that the concentrated slurry has a desired flow rate. That is, if the desired flow rate is insufficient, the apex valve 86
The throttle opening of the apex valve 86 is reduced when the flow rate exceeds a desired flow rate.

(Explanation of Modification of Flow Measurement) FIG.
As shown in FIG. 11, a measurement start position SP2 is set near the flow path end upstream of the open / close position of the measurement tube 160, and a measurement start detection sensor for detecting that the concentrated slurry has accumulated up to the measurement start position SP2. 82-2 is provided, a measurement end position EP2 is set upstream of the measurement start position, and a measurement end detection sensor 82-1 is provided to detect accumulation of the concentrated slurry up to the measurement end position EP2 to perform property measurement. Is also good.

In this case, the time during which the concentrated slurry is accumulated from the measurement start position SP2 to the measurement end position EP2 is measured, and the flow rate of the concentrated slurry may be calculated based on the accumulated time.

According to this, the measuring pipe 16 for the concentrated slurry
By closing 0 and accumulating the concentrated slurry, the concentrated slurry in the measuring tube 160 from the closing point to the measurement end position EP2 can be made homogeneous without air mixing. Since the measurement can be performed in this homogeneous state, the flow rate of the concentrated slurry having fluidity and difficult to measure can be accurately measured. In addition, since the start and end timings of the measurement are detected by the sensor, accurate measurement can be performed, and measurement accuracy of the flow rate of the concentrated slurry can be improved.

Although the tip of the sensor 82 is arranged in the hopper 15 in FIGS. 7A and 10, it may be arranged in the measuring tube 160. That is, only the measurement tube 160 may be used as the measurement channel, or the hopper 15 connected to the measurement tube 160 may be used in addition to the measurement tube 160.

Although the sensor 82 is provided at the center in FIG. 7A, depending on the arrangement of the enrichment cyclone 18,
When the concentrated slurry is flowing downstream, it may be provided at a position where it does not directly touch, and is not limited to the central part.

Further, as described above, the specific gravity and the flow rate of the concentrated slurry can be simultaneously measured at the timing when the concentrated slurry is accumulated up to the measurement end position. Thereby, efficient property measurement can be performed. Further, the property measurement in the measuring tube 160 may be performed continuously in combination with the classification processing by the concentrated cyclone 18 or may be performed intermittently only when necessary.

(Explanation of Cleaning Means) As shown in FIG. 7A, a cleaning device for cleaning the pressure detecting units 74-1 and 74-2 is provided. The cleaning device includes a cleaning nozzle 102,
104, valves 87 and 88 for controlling the ejection of the cleaning water from the cleaning nozzles 102 and 104, a cleaning pipe 230 as a flow path of the cleaning water, and a pump 92 for pumping the cleaning water. . Pump 92 and valves 87, 88
Is controlled by the cyclone controller 110.

According to this, the pressure detecting units 74-1 and 74-1
-2, the concentrated slurry adhering to -2 is removed by cleaning, and it can be accurately measured at the next measurement. Note that the sensor 82 may be configured to be cleaned.

The cleaning is performed after the properties are measured.
0 is performed after the downstream end of the measuring tube 160 is opened. Further, it is preferable to perform the jetting of the washing water with a small amount that does not affect the reforming. Further, for more complete washing, washing may be performed using a large amount of washing water when the concentrated cyclone is not operating.

(Explanation of Modification of Control Method) The throttle opening of the apex valve 86 can be controlled by giving priority to the specific gravity of the concentrated slurry or by giving priority to the flow rate. Normally, as described above, the muddy water treatment is performed in a state where the specific gravity of the concentrated slurry is as high as 1.4 or higher, with priority given to specific gravity. However, when the soil quality of the ground of the face changes rapidly, especially when the fine grain content increases, the priority of density decreases the classification amount of the concentrated slurry, which may hinder the tunnel excavation. In such a case, it is necessary to maintain the specific gravity of the muddy water at about 1.4, which is the lowest specific gravity that can be reformed, and switch to the flow rate priority.

Further, according to the present embodiment, FIG.
As shown in (A), the measurement pipe 16 is located from the downstream side of the measurement flow path.
Actuator 120 for opening and closing 0, measurement start position S
P1, differential pressure hydrometer 74, measurement end position EP1, sensor 8
Since they are provided in the order of 2, the specific gravity and the flow rate of the concentrated slurry described above can be simultaneously and accurately measured.

Thus, the specific gravity priority control shown in FIG. 6 is performed when the classification amount of the concentrated slurry is equal to or more than the minimum required amount of the concentrated slurry, and the flow rate control shown in FIG. By performing the above, an appropriate muddy water treatment can be performed even when the soil quality of the ground of the face suddenly changes, particularly when the amount of fine particles increases, so that stable tunnel excavation can be performed.

Further, according to the present embodiment, the aperture of the apex valve 86 can be automatically adjusted according to the tunnel excavation position. In this case, as shown in FIG. 8, the geology of the excavation route of the shield machine is previously surveyed by a boring survey or the like, and based on the survey data, the particle size distribution is grasped for each excavation region. It is stored in an internal storage device. In addition, it is set whether to control the concentration cyclone device 18 in the region in the density priority mode or the flow rate priority mode. Then, the control mode of the enrichment cyclone device 18 is switched based on the stored data and the current excavation position. Thereby, it is possible to automatically switch between density priority and flow rate priority.

The application of the present invention is not limited to the above-mentioned muddy water shield method. For example, the present invention can be applied to muddy water treatment in an underground continuous wall method, a reverse method, or the like.

[0134]

[Brief description of the drawings]

FIG. 1 is an overall view of a muddy water shield method according to an example of an embodiment of the present invention.

2 is a detailed view of the enrichment cyclone system shown in FIG. 1, (A) is a side view, and (B) is a plan view.

FIG. 3 is a sectional view of the concentrated cyclone shown in FIG.

FIG. 4 is a functional block diagram showing conventional specific gravity control of a concentrated slurry.

FIG. 5 is a diagram showing a change in specific gravity of a supply slurry, an over slurry, and a concentrated slurry.

FIG. 6 is a functional block diagram showing specific gravity control according to an example of the present embodiment.

FIGS. 7A and 7B are schematic diagrams of a property measuring system according to an example of the present embodiment, wherein FIG. 7A is a side view, and FIG.
It is sectional drawing.

FIG. 8 is a soil profile of a tunnel excavation route.

FIG. 9 is a diagram showing a grain size accumulation curve for each soil type in a tunnel excavation route. (A) shows the alluvial cohesive soil layer, (B) shows the sedimentary sandy soil layer, and (C) shows the grain size sedimentary curve of the diluent cohesive soil layer.

FIG. 10 is a functional block diagram illustrating flow control according to an example of the present embodiment.

FIG. 11 is a modified example of the property measuring system shown in FIG.

[Explanation of symbols]

 3 Adjustment tank 12 Excess mud tank 15 Hopper 18 Concentration cyclone apparatus 20 Concentration slurry tank 72 Density meter 74 Differential pressure specific gravity meter 82 Sensor 86 Apex valve 87,88 Valve 90 Cyclone pump 100 Strainer 110 Cyclone controller 120 Actuator 122 Hemisphere rubber ball 160 Measuring tube

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiko Asai 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Corporation (72) Inventor Takuo Endo 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Satoru Tabata 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Akio Uraya 3-39-1, Hazawa, Nerima-ku, Tokyo (72) Inventor Masaru Yasukochi 3-39-1, Hazawa, Nerima-ku, Tokyo

Claims (19)

[Claims] 1. A measurement flow path formed so that a concentrated slurry sent from a slurry processing liquid cyclone device flows downstream by its own weight, flow path opening / closing means for opening and closing the measurement flow path downstream side, Control means for controlling the flow path opening / closing means; and the concentrated slurry from a predetermined measurement start position in the measurement flow path to an upstream measurement end position by closing the measurement flow path by the flow path opening / closing means. A slurry property measuring system comprising: an accumulation time measuring means for measuring an accumulation time for accumulating water; and a flow rate calculating means for calculating a flow rate of the concentrated slurry based on the accumulation time. 2. The measuring flow path according to claim 1, further comprising a measurement end detection sensor for detecting that the concentrated slurry has accumulated up to the measurement end position, wherein the measurement start position is an opening / closing of the measurement flow path by the flow path opening / closing means. A slurry property measuring system set at a position. 3. The measurement start detection sensor according to claim 1, wherein the measurement start detection sensor detects that the concentrated slurry has accumulated up to the measurement start position set upstream of the open / close position of the measurement flow path. A slurry property measurement system, comprising: a measurement end detection sensor for detecting that the concentrated slurry has accumulated. 4. The slurry property measuring system according to claim 1, wherein the opening / closing means opens and closes an end on the downstream side of the measurement flow path. 5. The slurry property measurement system according to claim 1, wherein the measurement flow path is formed in a vertical direction. 6. The specific gravity detecting means according to claim 1, wherein said specific gravity detecting means is provided in said measurement flow path upstream of said open / close position and downstream of said measurement end detection position, and detects a specific gravity of said concentrated slurry. And a specific gravity calculating means for calculating a specific gravity of the concentrated slurry based on a specific gravity detection result by the specific gravity detecting means. 7. The differential pressure hydrometer according to claim 6, wherein the specific gravity detecting means is configured to include a differential pressure hydrometer having a plurality of pressure detectors arranged at different positions in contact with the measurement flow path. Slurry property measurement system. 8. The slurry property measuring system according to claim 7, further comprising cleaning means for cleaning the plurality of pressure detecting units. 9. The throttle opening control according to claim 1, wherein the throttle opening of the liquid cyclone apparatus is controlled based on at least one of a flow rate and a specific gravity measurement result obtained by the slurry property measuring system. Means for concentrating a slurry supplied to the hydrocyclone for slurry reforming. 10. The throttle opening control means according to claim 9, wherein, when the amount of the concentrated slurry classified by the liquid cyclone device is equal to or more than a predetermined amount, the concentrated slurry to be classified sets an optimum specific gravity condition. Specific gravity priority control of the throttle opening degree to satisfy, if the classification amount of the concentrated slurry to be classified in the liquid cyclone device is a predetermined amount or less, the concentrated slurry to be classified within the range that satisfies the allowable specific gravity condition A muddy water treatment system, wherein the throttle opening is subjected to flow rate priority control so as to increase the amount of classification. 11. The liquid cyclone device according to claim 1, wherein the liquid cyclone device is provided in a secondary treatment facility for muddy water generated by a muddy water method.
A muddy water treatment system characterized by classifying a slurry for secondary treatment supplied from a primary treatment facility for discharged muddy water and sending out the over muddy water to an adjusting tank or an excess muddy water tank. 12. The liquid cyclone device according to claim 11, wherein the liquid cyclone device includes a plurality of cyclones for classifying in parallel the secondary processing slurry from which components having a particle diameter of 74 μm or more have been removed by the primary processing. A muddy water treatment system characterized in that the concentrated slurry that has been classified and sent out is sent to a slurry reformer on the downstream side. 13. The throttle opening control means according to claim 9, wherein a path to be excavated by the muddy water method is defined as a density priority path and a flow rate priority path based on geological survey data obtained in advance. And a storage means for classifying and storing the secondary processing slurry obtained by the excavation of the density priority path. The density is controlled so that the flow rate of the secondary slurry obtained by excavating the flow rate priority path is increased within a range where the flow rate of the concentrated slurry to be classified satisfies the allowable specific gravity condition. A muddy water treatment system, wherein a flow rate priority control is performed on a throttle opening of the hydrocyclone device. 14. A step of closing a downstream side of a flow path of a concentrated slurry sent from a liquid cyclone apparatus for slurry processing by a flow path opening / closing means, and a step of closing a downstream side of a predetermined measurement start position in the measurement flow path. A storage time measuring step of measuring a storage time in which the concentrated slurry is stored up to a predetermined measurement end position, a flow rate calculating step of calculating a flow rate of the concentrated slurry based on the storage time, Opening the downstream side of the concentrated slurry flow path. 15. The pressure detecting step according to claim 14, wherein a pressure detecting step of detecting the pressure of the concentrated slurry by a plurality of pressure detecting units provided at different positions of the concentrated slurry flow path; And a pressure difference calculating step of calculating a pressure. 16. The method for measuring a slurry property according to claim 15, further comprising a cleaning step of cleaning the plurality of pressure detection units. 17. A throttle opening of the liquid cyclone device is controlled based on at least one measurement result of a flow rate or a specific gravity of a slurry obtained by using the slurry property measuring method according to any one of claims 14 to 16. A muddy water treatment method, comprising: a constriction opening control step for concentrating the slurry to be supplied to the liquid cyclone; and a concentrating step for concentrating the slurry for slurry reforming. 18. The method according to claim 17, wherein the throttle opening control step comprises: when a classification amount of the concentrated slurry classified by the liquid cyclone device is equal to or more than a predetermined amount, the concentrated slurry to be classified sets an optimum specific gravity condition. A specific gravity priority control step of performing specific gravity priority control of the throttle opening degree so as to satisfy, when the classification amount of the concentrated slurry classified by the liquid cyclone device is equal to or less than a predetermined amount, the concentrated slurry to be classified has an allowable specific gravity condition. A flow-priority control step of performing flow-priority control of the throttle opening such that the amount of classification increases within a range that is satisfied. 19. The secondary hydrocyclone device according to claim 14, wherein the hydrocyclone device is provided in a secondary treatment facility for a muddy water method, and a component having a particle size of 74 μm or more is removed by primary treatment. A muddy water treatment method comprising a plurality of cyclones for classifying processing slurries in parallel, and sending the classified concentrated slurry to a downstream slurry reformer.