JP4004107B2 - Slurry continuous reforming system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a slurry continuous reforming system for continuously reforming a slurry generated during civil engineering work or the like.
[0002]
[Background Art and Problems to be Solved by the Invention]
  In the field of the muddy water construction method, the muddy water treatment system is used to treat slurry as waste mud water used in the construction, for example, in a shaft excavation method using a stabilizing liquid or a muddy water type shield method. 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 type shield method.
[0003]
  Since such a muddy water treatment system is usually installed on the ground, a small installation space and a flexible layout are required due to restrictions on the site, and wastewater from the construction site can be treated in a short time. Capability is also required.
[0004]
  For example, when excavating a face using a muddy water type shield machine, the muddy water used for stabilizing the face in the muddy water type shield machine is sent back to the muddy water treatment facility on the ground as slurry mixed with the excavated earth and sand. In the muddy water treatment facility, the sediment component is separated and removed from the returned slurry, and the necessary component adjustment is performed, and then the processing is sent out again to the shield machine.
[0005]
  The muddy water treatment facility usually includes a primary treatment facility and a secondary treatment facility.
[0006]
  Slurry sent to the ground from the muddy water shield machine is first processed in the primary processing equipment and then stored in the adjustment tank. In the primary treatment facility, sand having a particle size of 74 μm or more is removed using a hydrocyclone, and further passed through a vibration sieve, so that it is stored in a regulating tank as a slurry containing 74 μm or less of silt or clay. . The earth and sand separated by the primary treatment facility is stored in a hopper via a belt conveyor, and is carried out as soil by a dump truck or the like.
[0007]
  The slurry stored in the adjustment tank is adjusted for viscosity by adding a thickener, etc., using a mud-making facility, and the density is adjusted by supplying water from the fresh water tank. Is sent to the shield machine again through the mud pipe.
[0008]
  When performing component adjustment in such an adjustment tank, the slurry in an adjustment tank overflows with the water sent from a fresh water tank. This overflowed slurry is stored in a surplus muddy water tank as surplus muddy water. This surplus muddy water is treated in a secondary treatment facility and 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 a residual soil by a dump truck or the like, and is carried out to an intermediate treatment plant for industrial waste.
[0009]
  Conventionally, in this secondary treatment facility, a flocculant is added to the muddy water taken out from the surplus muddy water layer, and this is compressed with a filter press at an extremely high pressure to separate into water and other sediment components. The separated water was discharged through the tertiary treatment facility, and the earth and sand components were carried out in a solidified state and carried into the hopper by the belt conveyor.
[0010]
  However, in the method using such a filter press, the slurry as surplus muddy water must be compressed at an extremely high pressure, and therefore, the filter press itself needs to have a very high mechanical strength. For this reason, the entire system becomes large and expensive.
[0011]
  In order to solve such a problem, there has been proposed a muddy water treatment facility for concentrating a slurry as surplus muddy water using a liquid cyclone in a secondary treatment facility and reforming the concentrated slurry by adding a modifier. .
[0012]
  The mud treatment facility according to this proposal is usually modified by adding a modifier to the concentrated slurry, and the modified soil thus obtained is temporarily stored in a hopper or the like, and then transported by a dump truck or the like. Was.
[0013]
  Therefore, a large space for storing the modified earth and sand is required, and this storage space must be provided close to the loading area for dump trucks and the like, considering the efficiency of carrying out the earth and sand. It will be limited. As a result, the muddy water treatment facility according to this proposal also has a problem that it requires a large installation space and takes a reforming time.
[0014]
  An object of the present invention is to adopt a configuration in which earth and sand are transported to an arbitrary position in a liquid state and immediately reformed in the vicinity of the exit, thereby reducing the area of ground equipment and continuously slurrying in a short time. It is to provide a slurry continuous reforming system that reforms automatically.
[0015]
[Means for Solving the Problems]
  To achieve the purpose,Continuous slurry reforming system according to the present inventionIs a first path through which the slurry to be treated is conveyed,
  A modifying agent mixing means for mixing a modifying agent for modifying the slurry into the slurry conveyed in the first path;
  The modifier mixed in the slurry is evenly dispersed in the slurry.Static mixerWhen,
  Slurry after the dispersionStirStirringmixerWhen,
  Control means for controlling the rotational speed of the stirring mixer;
  Density measuring means provided on the upstream side of the first path and measuring the density of the slurry;
  A flow rate measuring means provided on the upstream side of the first path for measuring the flow rate of the slurry;
  IncludingSee
  The control means controls the rotational speed of the stirring mixer based on the density measured by the density measuring means and the flow rate measured by the flow rate measuring means.It is characterized by that.
[0016]
  Also,The control unit controls the modifying agent mixing unit so that the mixing amount of the modifying agent is adjusted based on the density measured by the density measuring unit and the flow rate measured by the flow rate measuring unit. May.
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
[0023]
  BookAccording to the invention, after adding the modifier to the slurry, the modifier is quickly and uniformly dispersed in the slurry by the dispersing means, and stirred by the agitating means, thereby generating high-speed subsidence and strong shearing force. Can be generated in the slurry. Thereby, the reforming effect can be enhanced and the slurry can be reformed continuously and in a short time.
[0024]
  Also,in frontStirringmixerIs
  A casing,
  A wing that is provided in the casing and that is rotated and driven to stir the slurry;
  A subsidence generating space provided in the casing adjacent to the rotating surface of the wing body and generating subsidence in the slurry;
  An inlet for introducing slurry into the casing from the center side of the rotating surface of the wing,
  A discharge port for discharging the stirred slurry from the outside of the center of the rotating surface of the wing,
  IncludingSee
  The control means may control the rotational speed of the wings..
[0025]
  thisAccording to the above, by stirring the slurry after addition of the modifier using a static mixer, the modifier can be evenly dispersed in the slurry in a short time, for example, a few seconds. Further, by stirring the slurry in which the modifier is uniformly dispersed using a stirring mixer, a strong shearing force can be generated in the slurry, and the reforming effect can be enhanced. This is because the slurry introduced from the inlet toward the rotation center axis of the wing is rotated by the wing, and a strong shearing force is applied by the underground flow generation space in the casing and the underground flow generated in the vicinity thereof. .
[0026]
[0027]
  Also thisSince the rotational speed of the wings can be adjusted according to the specific gravity of the slurry, etc., it can be appropriately modified according to the properties of the slurry to be treated.
[0028]
[0029]
[0030]
[0031]
  Also,in frontA second path is provided downstream from the first path, and the second pathIn addition, a stabilizer addition means for adding a stabilizer to the slurry may be provided..
[0032]
  thisAccording to the above, stirring and mixing can be performed by the first path, and the reforming time can be secured by the second path, so that the slurry can be reformed efficiently.
[0033]
[0034]
[0035]
[0036]
  Also thisAccording to the present invention, a stabilizer can be added to the slurry for reforming, so that the modified soil can be kept in a stable state for a long period of time after being transported to an intermediate treatment site for industrial waste and solidified.
[0037]
[0038]
[0039]
[0040]
[0041]
[0042]
[0043]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a preferred embodiment utilizing a slurry continuous reforming system according to the present invention will be described in detail with reference to the drawings.
[0044]
  FIG. 1 is a schematic view showing a state in which the modifier 210 is added to the slurry 200. Here, the modification means that the surface potential of the fine particles is neutralized by the coagulation action, and the particles are easily bonded to each other, and the particles are coarsened by the cross-linking adsorption action by hydrogen bonds by the functional group of the polymer. That means. For this reason, the modifier 210 is preferably one in which fine anionic polymer particles 212 are dispersed and suspended in a non-aqueous medium 214 that does not react with the anionic polymer particles 212.
[0045]
  Since the anionic polymer particle 212 is a single-chain polymer, when the modifier 210 is added to the slurry 200, the anionic polymer particle 212 is a single-chain that has been agglomerated due to electrostatic repulsion between ionic groups in the anionic polymer particle 212. Each polymer is in a state where the chain extends. When stirring and mixing in this state, the particles can be coarsened by a cross-linking adsorption action due to hydrogen bonding or the like by the functional group of the single chain polymer.
[0046]
  FIG. 1A is a schematic diagram of a slurry 200, and the slurry 200 mainly includes clay particles 202 and water molecules 204. FIG. 1B is a schematic view of the modifying agent 210, and the modifying agent 210 mainly includes anionic polymer particles 212 and a non-aqueous medium 214.
[0047]
  The state in which the modifier 210 is added to the slurry 200 is as shown in FIG. The single-chain polymer that is the polymer particle 212 is in a state in which the yarn is entangled as shown in FIG. 1B before being added to the slurry. It becomes the upper polymer 212. In the state shown in FIG. 1B, the polymer particles 212 are not dispersed in a long chain because they are dispersed and suspended in the non-aqueous medium 214. However, simply adding the modifier 210 results in an inhomogeneous state, and if it is reformed as it is, an unstable floc 218 is formed and there is a risk of reflow during transportation to the treatment plant. For this reason, it is necessary to uniformly disperse the modifier 210 in the slurry 200.
[0048]
  FIG. 1D shows this dispersion state. Thus, if the particles are evenly dispersed, as shown in FIG. 1E, even when the floc 218 is formed, the floc 218 becomes strong and stable.
[0049]
  Furthermore, in order to enhance the effect of the modification, it is preferable that a strong shear force is generated in the slurry 200 by stirring or the like after the modifier 210 is added to the slurry 200 and the modifier 210 is quickly dispersed. .
[0050]
  Here, examples of the anionic polymer particles 212 include polyacrylamide hydrolyzate, polyacrylate, acrylamide / acrylate copolymer, polystyrene sulfonic acid, polyvinyl sulfonic acid, polymaleic acid polymer, and carboxymethyl cellulose. In particular, an acrylamide / acrylate copolymer is preferable. In addition, since the size of the anionic polymer particles 212 is as fine as about 1 to 5 μm, after the solid single-chain polymer is dispersed in water, each chain extends in a short time. become.
[0051]
  Examples of the medium 214 include liquid hydrocarbons such as benzene, toluene, xylene, mineral oil, kerosene, and naphtha, and a mixture of aliphatic hydrocarbon compounds having 4 to 8 carbon atoms is particularly preferable. This is because it is inert and hydrophobic with respect to the anionic polymer particles 212, has no toxicity, and is highly safe.
[0052]
  Hereinafter, a preferred embodiment using the slurry continuous reforming system according to the present invention using the above-described reforming action will be described in detail with reference to the drawings, taking a muddy water type shield construction method as an example.
[0053]
  FIG. 2 shows a muddy water type shield construction method to which the present invention is applied. The muddy water type shield construction method is realized by including the mud conditioning system 8, the shield machine 34, the mud supply system 43, the mud discharge system 47, and the continuous reforming system 30.
[0054]
  The mud adjusted to a predetermined property in the mud conditioning system 8 is sent to the chamber 42 inside the shield machine 34 through the mud feeding system 43 and used stably for the face 46, and the excavated sediment and agitation are stirred in the chamber 42. The mixed slurry 200 is sent to the continuous reforming system 30 via the mud discharge system 47.
[0055]
  The mud feeding system 43 includes a mud feeding pump 56 and a mud feeding pipe 44, and supplies mud water pressurized by the mud feeding pump 56 to the chamber 42 via the mud feeding pipe 44.
[0056]
  The shield machine 34 is provided in a form that is sandwiched between the cutter disk 40 that excavates the face 46, a partition wall 41 that prevents intrusion of excavated earth and sand into the tunnel, and the mud feeding system 43 inside. And a chamber 42 that is filled with mud water or the like supplied from, and resists earth pressure or the like on the face of the face 46.
[0057]
  The mud draining system 47 is a path for transporting the slurry 200 in which the mud is stirred and mixed with the excavated sediment in the chamber 42, and the mud pump 58 that pressurizes and transports the slurry 200 sent from the chamber 42, and the path And a relay pump 57 that pressurizes and conveys the slurry 200 again during transportation.
[0058]
  The continuous reforming system 30 is configured to include a first path 1 and a second path 3. The slurry 200 transported from the mud discharge system 47 to the first path 1 is added with the modifier 210, uniformly dispersed and stirred, and then transported to the second path 3, where the second path 3 Immediately before the exit of the vehicle, it is reformed and loaded directly onto the dump truck 120.
[0059]
  FIG. 3 shows a detailed view of the continuous reforming system 30. The first path 1 is provided with the modifier 210 and is provided on the downstream side of the static mixer 10 in which the modifier 210 is evenly dispersed in the slurry 200, and the modifier 210 is added. And a stirring mixer 12 that stirs the slurry 200 at a high speed. The static mixer 10 is connected to a modifier supply pipe 74 that is connected to the modifier tank 70.
[0060]
  The second path 3 is provided downstream of the first path 1 and includes a spiral mixer 4. The spiral mixer 4 is provided on the downstream side of the stirring mixer 12 and is arranged so that the stabilizer is supplied from the stabilizer tank 90 to the stabilizer supply port near the inlet of the spiral mixer 4 via the mixer 94. .
[0061]
  FIG. 4 shows a cross-sectional view of the static mixer 10. The static mixer 10 is a stationary mixer in which elements 154, 155, 156, 157, 158, and 159 are integrally formed inside the cylinder 142 and the cylinder 142. The element is a rectangular plate, and half of the downstream plate with respect to the transport direction is twisted 180 degrees to the right (right element) or twisted 180 degrees to the left (left element). The action of the static mixer 10 includes a division action, a conversion action, and an inversion action. The dividing action is an action in which the conveyed object is divided into two every time one element passes, and the conversion action is the rotation of the conveyed object in the reverse direction from the forward rotation at the boundary between the elements. This is an action in which the flow is disturbed by inertial force and mixing is promoted, and the reversal action is an action in which the rotation of the conveyed object for each element is changed from the forward rotation to the reverse rotation. That is.
[0062]
  In addition, since the slurry 200 which is a treatment target of the present invention has a large material viscosity, the reversing action hardly works, and the dividing action and the converting action work. By each of these actions, the modifier 210 can be evenly dispersed in the slurry 200 in a short time, for example, a few seconds, and the reforming effect can be enhanced as described above. Moreover, although the static mixer 10 of FIG. 4 is comprised by six elements, in order to adjust a division | segmentation effect | action, the number of elements is not restricted to six.
[0063]
  5-7 is explanatory drawing of the stirring mixer 12, and are front sectional drawing, side sectional drawing, and side sectional schematic, respectively. The agitating mixer 12 is provided in the casing 102, provided in the casing 102, and a wing body 100 that stirs the slurry 200 by being driven to rotate, and is adjacent to the rotating surface of the wing body 100. The subsurface flow generation space 104 for generating subsurface flow in the slurry 200, the introduction port 110 for introducing the slurry 200 into the casing 102 from the center side of the rotation surface of the blade body 100, and the slurry 200 after stirring the rotation surface of the blade body 100. And a discharge port 112 for discharging from the outside of the center.
[0064]
  As shown in FIG. 5, the wings 100 are arranged in a spiral shape from the vicinity of the center of the rotating surface toward the outside, and a plurality of wings 100 are provided in the casing 102. As shown in FIG. 6, the slurry 200 evenly dispersed by the static mixer 10 is introduced into the casing 102 from the introduction port 110, and is agitated by rotating the wing body 100 at a high speed. The ink is discharged and conveyed toward the second path 3.
[0065]
  As shown in FIG. 7, a downflow generation space 104 is provided in a space adjacent to the wing body 100 in the casing 102. When the wing 100 is rotationally driven at a high speed, a high-speed underflow 105 is generated in the slurry 200 in the casing 102, and a shearing force is generated in the slurry 200.
[0066]
  Thereby, the reforming effect can be enhanced, and the slurry 200 can be reformed continuously and in a short time. This is because the slurry introduced from the inlet 110 toward the rotation center axis of the wing 100 is rotated by the wing 100, and a strong shear force is generated by the underflow generation space 104 in the casing 102 and the subsurface flow generated in the vicinity thereof. By being granted.
[0067]
  FIG. 8 shows the velocity distribution of the flow of the slurry 200 generated between the wings 100, and (B) shows the distribution when the rotation speed of the wings 100 is increased as compared to (A). Thus, as the rotational speed of the wing body 100 increases, the speed difference in the slurry 200 in the casing 102 increases, and the above-described shearing force increases.
[0068]
  That is, since the reforming effect can be adjusted by controlling the rotation speed of the wing body 100, the rotation speed of the wing body 100 is also determined according to the specific gravity of the slurry 200 even when a predetermined amount of the modifier 210 is added from a predetermined location. By controlling the above, it is possible to always make the slurry 200 after the stirring mixer 12 has a constant reforming quality.
[0069]
  FIG. 9 is a graph showing the relationship between the rotation speed of the stirring mixer 12 and the reforming time. In FIG. 9, the curve 120 is the slurry 200 having a higher specific gravity than the curve 122. As shown in FIG. 9, in order to obtain a predetermined reforming quality in t1 time, when the slurry 200 has a specific gravity as shown by the curve 120, the rotational speed of the stirring mixer 12 is controlled to be v1, If the specific gravity is as shown by the low specific gravity curve 122, the rotational speed of the agitating mixer 12 may be increased and controlled to become v2.
[0070]
  In particular, it is preferable to apply the continuous reforming system 30 according to the present embodiment to the slurry 200 having a specific gravity of 1.3 or more and 1.7 or less.
[0071]
  Usually, the slurry 200 having a high specific gravity is easy to be modified by adding a small amount of the modifier 210 and a slight stirring, but the slurry 200 having a low specific gravity of less than 1.4 is difficult to modify and is expensive. In addition to adding a large amount of the modifier 210, it takes time for the reforming, and it is difficult to reform economically and in a short time. In the present embodiment, the modifier 210 is evenly dispersed to generate a strong shearing force due to the generation of high-speed subsidence, etc., so that it is economically sufficient for a low specific gravity slurry with a specific gravity of less than 1.4 in a short time. Can be modified.
[0072]
  Moreover, the slurry can be reformed continuously and in a short time without using a sediment pit or the like, which leads to a reduction in the area of the ground. Although it is possible to modify a slurry having a specific gravity of 1.7 or more, it is preferable that the specific gravity of the slurry is 1.7 or less in view of the blockage of the path during slurry conveyance. Moreover, in order to modify the slurry continuously and in a short time, the specific gravity of the slurry is preferably 1.3 or more.
[0073]
  In the first path 1, the slurry 200 to which the modifier 210 is added, dispersed, and stirred is conveyed to the second path 3 in a fluid state. The second path 3 is a period from loading to unloading to the second path 3 so that a sufficient time can be secured for reforming the slurry 200 stirred and mixed in the first path 1. The transfer time is set. Thereby, it can disperse and stir by the 1st path | route 1, can ensure the modification | reformation time by the 2nd path | route, and can modify | reform the slurry 200 for a short time continuously.
[0074]
  As shown in FIG. 3, a mixer is provided in the second path 3, and for example, a spiral mixer 4 is used as the mixer. The spiral mixer 4 is a large-diameter mixer as compared with the static mixer 10, and is formed to have a diameter capable of transporting the slurry 200 modified inside the spiral mixer 4. Thereby, even when the slurry 200 is reformed inside the spiral mixer 4, the spiral mixer 4 is not blocked and the modified soil can be carried out satisfactorily. Further, stirring and mixing can be performed by the first path to perform constant reforming, and a constant reforming time can be ensured by the second path.
[0075]
  The diameter of the spiral mixer 4 differs depending on the amount of earth and sand processing and cannot be generally stated, but about 0.3 to 0.7 m is appropriate. For example, if the conveyance amount of the spiral mixer 4 is 0.5 m 3 / min to 1 m 3 / min, the one of 0.6 m is preferable. If this amount of transport can be secured, the dump truck 120 can be loaded in 5 to 10 minutes.
[0076]
  In addition, the slurry 200 supplied to the spiral mixer 4 is added with the stabilizer supplied from the inlet of the spiral mixer 4 through the mixer 94 which is a path between the stabilizer tank 90 and the spiral mixer 4. It is stirred and transported. As the stabilizer, a lime-based or cement-based stabilizer is desirable. The modified earth and sand that has been modified by adding a stabilizer to the slurry 200 is long due to the modifying action of the lime-based or cement-based stabilizer even if left for a long period of time in an industrial waste intermediate treatment plant. The modified soil can be stored in a stable state for a period of time. Further, as shown in FIG. 3, the lower part of the carry-out port of the spiral mixer 4 is a place for loading into the dump truck 120, and the modified soil can be continuously loaded. Thereby, since the dump truck 120 can be loaded in a reformed state, a temporary storage facility such as an earth and sand pit is not required, and the ground processing facility can be saved.
[0077]
  Next, the flow of control such as addition of the modifier 210 in the continuous reforming system 30 will be described. As shown in FIG. 3, various controls are performed by the control device 20. On the upstream side of the static mixer 10, a flow meter 66 is provided as a flow measurement unit, and a density meter 64 is provided as a density measurement unit, and these measurement units are controlled by the control device 20.
[0078]
  Further, the flow rate and the density of the slurry 200 supplied to the static mixer 10 are measured by the flow meter 66 and the density meter 64, and the measured values are compared with the known reference values by the control device 20, whereby the slurry 200 is measured. The property is judged. Based on the determined properties of the slurry 200, the addition amount of the modifier 210 is determined.
[0079]
  As described above, the addition amount of the modifier 210 can be controlled. However, since the modifier 210 is expensive, the addition amount of the modifier 210 is preferably set to the minimum necessary amount. . For this purpose, as described above, the addition amount of the modifier 210 can be set to the minimum necessary amount and can be adjusted by controlling the rotation of the stirring mixer 12. Similarly, in this control, the flow meter 66 and the density meter 64 measure the flow rate and density of the slurry 200 supplied to the static mixer 10, and the control device 20 compares these measured values with known reference values. Thus, the properties of the slurry 200 are determined, and the rotation of the stirring mixer 12 is controlled.
[0080]
  Thereby, since the addition amount of the modifier 210 can be set to the minimum necessary amount, the amount of the expensive modifier 210 used can be reduced and the reforming can be performed at a low cost.
[0081]
  Moreover, although the rotational speed of the motor 96 of the spiral mixer 4 is normally kept constant, the rotational speed may be changed according to the properties of the slurry 200. That is, when the specific gravity of the slurry 200 supplied to the static mixer 102 is high or when the flow rate is low, a small amount of the modifier 210 or stabilizer is added, and when the specific gravity is low or the flow rate is high, the reforming is performed. Many agents 210 and stabilizers are added.
[0082]
  Further, the control device 20 controls the motor 97 based on the measured properties of the slurry 200, and a stabilizer is added from the mixer 94.
[0083]
  Conventionally, a large muddy water treatment facility such as a filter press is required for reforming, and it takes many hours to reform the slurry. If it is not reformed, it must be transported to a disposal site by a high-pressure vacuum vehicle. Because it had to be done, it was very expensive.
[0084]
  According to the present embodiment, since a large muddy water treatment facility such as a filter press is not required, it is possible to reduce the area of the ground facilities and to improve in about ten seconds, the muddy water treatment time is shortened, Since the dump truck 120 can be continuously loaded at a low processing cost, the cost can be reduced. Further, since the minimum required modifier 210 and stabilizer can be added to the slurry 200 by the flow rate control means and density control means, the use of expensive modifiers 210 and stabilizers can be reduced. The amount of industrial waste discharged to an intermediate treatment plant can also be reduced.
[0085]
  The application of the present invention is not limited to the muddy water shield method. For example, it can be applied to slurry treatment in underground continuous wall construction method, reverse construction method and the like. Further, the embodiment is not limited to the above-described embodiment, and can be applied to various modified examples.
[0086]
  For example, as shown in FIG. 10, by moving the carry-out side of the spiral mixer 4 upward by a predetermined amount, the low specific gravity slurry 200 has not been sufficiently reformed and has been transported to the spiral mixer 4 in a state close to water. Even in this case, the slurry 200 in a state close to water can be retained in a portion near the motor 96 in the spiral mixer 4. Further, since the inside of the spiral mixer 4 is constituted by a ribbon screw, there are many gaps, and the slurry 200 close to water cannot be carried out, and only the modified soil that has been modified to some extent is conveyed and carried out by the rotation of the ribbon screw. Can do.
[0087]
  Also, a liquid cyclone apparatus for treating the slurry 200 for classifying the slurry 200 to be treated and producing a slurry concentrated for reforming, and a concentrated slurry storage means for storing the concentrated slurry classified by the liquid cyclone apparatus And the concentrated slurry may be supplied from the concentrated slurry storage means to the first path for reforming. Thereby, even the low specific gravity slurry 200 having a specific gravity of less than 1.3 can be adjusted and modified by the hydrocyclone device to have a specific gravity of 1.3 or more and 1.7 or less which can be easily modified.
[0088]
  In addition, a slurry storage facility may be provided in a drainage route such as in a shaft and the slurry 200 may be temporarily stored.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a state in which a modifier is added to a slurry, where (A) is the state of the slurry before addition of the modifier, and (B) is the state of the modifier before being added to the slurry. (C) shows the state of the slurry immediately after the addition of the modifier, (D) shows the state of the slurry after dispersion, and (E) shows the state of the slurry after stirring.
FIG. 2 is an overall view of a muddy water type shield method according to an example of an embodiment of the present invention.
FIG. 3 is a schematic view of a continuous reforming system according to an example of an embodiment of the present invention.
FIG. 4 is a side sectional view of a static mixer according to an example of an embodiment of the present invention.
FIG. 5 is a front sectional view of a stirring mixer according to an example of an embodiment of the present invention.
FIG. 6 is a side cross-sectional view of a stirring mixer according to an example of an embodiment of the present invention.
FIG. 7 is a schematic view showing a flow of slurry in a stirring mixer according to an example of an embodiment of the present invention.
FIGS. 8A and 8B are diagrams showing a velocity distribution of fluid between wings in a general spiral pump, where FIG. 8A shows an inflow rate to the spiral pump of 8 liters / second, and FIG. The velocity distribution in the case of / sec is shown.
FIG. 9 is a graph showing the relationship between the rotation speed of the blades of the stirring mixer and the reforming time of the slurry according to an example of the embodiment of the present invention.
FIG. 10 is a schematic diagram showing another example of a continuous reforming system according to an example of an embodiment of the present invention.
[Explanation of symbols]
2 Mixer
4 Spiral mixer
8 Mud control system
10 Static mixer
12 Mixing mixer
20 Control device
32 shaft
34 Shield machine
36 tunnel
40 Cutter disc
41 Bulkhead
42 chamber
44 Mud pipe
46 face
48 Waste pipe
56 Mud pump
57 Relay pump
58 Mud pump
64 Density meter
66 Flowmeter
70 modifier tank
72 Modifier supply pump
74 Modifier supply pipe
90 Stabilizer tank
94 Stabilizer supply pipe
96, 97 motor
100 wings
102 casing
104 Underflow generation space
105 Underflow
110 Inlet
112 Discharge port
120 dump truck
142 cylinder
154 to 159 elements
200 slurry
202 clay particles
204 Water molecule
210 Modifier
212 polymer particles
214 Non-aqueous media
218 frock

Claims (4)

A first path through which slurry to be treated is conveyed;
A modifying agent mixing means for mixing a modifying agent for modifying the slurry into the slurry conveyed in the first path;
A static mixer for uniformly dispersing the modifier mixed in the slurry in the slurry;
A stirring mixer for 攪拌the slurry after the dispersing,
Control means for controlling the rotational speed of the stirring mixer;
Density measuring means provided on the upstream side of the first path and measuring the density of the slurry;
A flow rate measuring means provided on the upstream side of the first path for measuring the flow rate of the slurry;
Only including,
The slurry continuous reforming system , wherein the control means controls the rotational speed of the stirring mixer based on the density measured by the density measuring means and the flow rate measured by the flow rate measuring means . In claim 1,
The control unit controls the modifying agent mixing unit so that the mixing amount of the modifying agent is adjusted based on the density measured by the density measuring unit and the flow rate measured by the flow rate measuring unit. A slurry continuous reforming system. In any one of Claims 1, 2.
Before Symbol stirring mixer,
A casing,
A wing that is provided in the casing and that is rotated and driven to stir the slurry;
A subsidence generating space provided in the casing adjacent to the rotating surface of the wing body and generating subsidence in the slurry;
An inlet for introducing slurry into the casing from the center side of the rotating surface of the wing,
A discharge port for discharging the stirred slurry from the outside of the center of the rotating surface of the wing,
Only including,
The slurry continuous reforming system , wherein the control means controls the rotational speed of the wings . In any one of Claims 1-3 ,
A second path is provided downstream from the first path;
The slurry continuous reforming system, wherein a stabilizer addition means for adding a stabilizer to the slurry is provided in the second path .

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