JP6168446B2 - Containment method for contaminated floating mud - Google Patents

Description

The present invention river relates containment method contamination浮泥 for containing contamination浮泥containing dioxins and cesium hazardous substances deposited on the sea bed of the body of water such as lakes or seas on the sea bed unit.

  Hazardous substances such as dioxin and cesium consist of very small particles of several microns, and when they flow into water such as rivers, lakes or seas due to rainfall, they can be adsorbed on the floating mud deposited on the bottom surface of the water High nature.

  Since such floating mud moves in the water area due to the influence of waves and water currents, there is a risk that harmful substances will be carried to the floating mud and spread, and harmful substances will be ingested by the bottom and aquatic organisms. There is also concern that the food chain will affect the human body.

  Therefore, conventionally, as a method for removing the adverse effects of such harmful substances, a method of covering the contaminated floating mud containing the hazardous substances with mud or sandy soil, etc. and enclosing the contaminated floating mud with the soil (covering) Sand construction method) is known (see, for example, Patent Document 1).

JP 2000-136533 A

  However, the contaminated buoyant mud containing toxic substances has a high water content ratio of several hundreds to several thousand% and a high shear strength, so that the conventional technology as described above contaminates soil and the like. When covered on the floating mud, the contaminated floating mud easily diffuses to the surroundings under the pressure of the earth and sand, so that there is a problem that it is very difficult to contain the contaminated floating mud.

Then, in view of such a conventional problem, the present invention was made for the purpose of providing a method for containing contaminated floating mud that can reliably contain contaminated floating mud containing pollutants deposited on the surface layer of the bottom of the water. .

  The feature of the invention according to claim 1 for solving the conventional problems as described above is that a solidified soil for embankment having low fluidity including a solidifying material is provided at a water bottom where contaminated floating mud containing a pollutant is accumulated. Constructing a plurality of diffusion prevention dike in an arrangement to enclose the contaminated floating mud, forming one or a plurality of mud storage parts surrounded by the diffusion prevention dike, and in each mud storage part The contaminated floating mud is taken in, and the contaminated floating mud is dammed up by a diffusion prevention bank, and then a solidified soil for sealing containing a solidifying material is placed on each of the mud storage parts, and the solidified soil for sealing There is a method for containing contaminated floating mud that seals the upper surface of each mud storage unit with a material.

  The feature of the invention described in claim 2 is that, in addition to the structure of claim 1, the solidification soil material for blockade has a certain fluidity, and the solidification for blockade is passed through a blockage casting tube inserted in water. The treated soil material is allowed to flow down on each of the mud reservoirs, and the lower end of the sealing casting pipe is embedded in the sealed solidified soil material for sealing that has flowed down and accumulated on the respective mud reservoirs. It is to sequentially cast solidified soil material for blockade.

  As described above, the contaminated floating mud containment method according to the present invention includes placing the embankment solidified soil material containing a solidifying material on the bottom of the water where contaminated floating mud containing the pollutant is deposited, and Constructing a plurality of diffusion prevention dike in an arrangement surrounding the diffusion prevention ditches, forming one or a plurality of mud storage parts surrounded by the diffusion prevention dike, and taking the contaminated floating mud into each of the mud storage parts, Then, by placing a solidified soil for sealing containing a solidifying material on each of the mud storage portions, and sealing the upper surface of each of the mud storage portions with the solidified soil for sealing, dioxins, cesium, etc. Highly fluid floating mud containing pollutants is blocked by the diffusion prevention dam, and the solidified soil for sealing that covers the contaminated floating mud is supported by the diffusion prevention dam, so that the contaminated floating mud is securely contained in the bottom of the water and contaminated. The diffusion of the substance can be prevented.

  Further, in the present invention, the solidification soil material for blockade has a certain fluidity, and the solidification soil material for blockade is allowed to flow down onto each of the mud storage portions through a sealing placement tube inserted in water. By sequentially placing the sealing solidified soil for sealing in a state where the lower end of the sealing casting pipe is embedded in the solidified soil for sealing which has flowed down and deposited on the respective mud storage portions. The solidified soil for sealing can be spread evenly on the mud reservoir, and the upper surface of the mud reservoir can be suitably sealed.

It is a schematic longitudinal cross-sectional view for demonstrating the state which contained the contaminated floating mud by the method of this invention. It is a side view which shows the outline of the apparatus used for the containment construction method of the contaminated floating mud concerning this invention. It is a side view which shows the outline of the earth material adjustment ship which adjusts earth material to muddy water. (A) is the elements on larger scale which show an example of the embankment construction pipe, (b) is the longitudinal cross-sectional view, (c) is the bottom view. (A) is a transverse cross-sectional view showing an example of a sealing placement pipe, and (b) is a longitudinal cross-sectional view thereof. (A)-(c) is a figure which shows the outline of each process of the contaminated floating mud containment method concerning this invention, Comprising: The upper stage is a schematic plan view which shows the state of each process, and the lower stage is the same schematic longitudinal cross-sectional view. is there.

Next, an embodiment of the contaminated mud containment method according to the present invention will be described based on the examples shown in FIGS. FIG. 1 is a view showing a state in which contaminated floating mud is contained in the bottom of the water by the contaminated floating mud containment method according to the present invention. In the figure, symbol A is the bottom of the water, symbol B is the water surface, and symbol C is Polluted floating mud containing harmful substances such as dioxin and cesium.

  In this method of containment of contaminated floating mud, there are a plurality of arrangements that enclose the contaminated floating mud C by placing a solidified soil for embankment containing a solidifying material on the bottom A where the contaminated floating mud C containing the pollutant is deposited. , And one or more mud storage sections 2, 2 ... surrounded by the diffusion prevention dikes 1, 1 ... are formed, and each mud storage section 2 .., 2... Are taken in the contaminated floating mud C, and then a solidifying soil material for sealing containing a solidifying material is placed on each of the mud storage portions 2 and 2, and is composed of a solidified soil material for sealing. The sealing lid layer portion 3 is formed, and the upper surface portion of each of the mud storage portions 2, 2... Is sealed with the sealing lid layer portion 3 so as to contain the contaminated floating mud C in the water bottom A. .

  The solidification soil material for embankment and the solidification treatment soil material for blocking are prepared by mixing soil materials such as bentonite, solidification materials such as blast furnace cement and water in different blends. For example, an underwater driving device having an underwater driving vessel 4 as shown in FIG. 2 is used, and a solidification processing soil material for embankment or a solidification processing soil material for blockade is supplied to the underwater driving boat 4 from the solidification processing soil supply means. It is supplied in a pressurized state, and it is placed on the water bottom A by placing pipes 5A and 5B having different lower end shapes.

  The solidified soil supply means includes a soil material adjusting ship 6 that mixes seawater or fresh water in a desired ratio with a soil material such as bentonite, and adjusts the soil material into a muddy water state, and a muddy water state that is supplied from the soil material adjusting ship 6. And a solidification material mixing vessel 8 for mixing the solidification material into the soil material slurry 7 of the submerged, and the solidification treatment soil material for embankment or the solidification treatment soil material for blockade mixed in a desired composition is placed in the underwater placement vessel 4. It can be supplied to 5A and 5B.

  As shown in FIG. 3, the earth material adjustment ship 6 supplies the earth material such as bentonite in the tank 11 a to the line mixer 10 at regular intervals. A device 11 and a water supply device 13 composed of a pump or the like that pumps water in the water storage tank 12 so that the flow rate can be adjusted and supplies the water to the pipe mixer 10 are used for the earth material such as bentonite supplied in the pipe mixer 10. Water is supplied at a predetermined ratio from the water supply device 13 and mixed while being stirred by the screw 10a. In addition, the code | symbol 13a in a figure is a flowmeter, Comprising: The water supply apparatus 13 adjusts flow volume based on the measured value of this flowmeter 13a.

  The muddy water-like soil slurry 7 mixed by the pipe mixer 10 is discharged from the end of the pipe mixer 10 to a temporary storage mud tank 14 installed on a trolley, and pumped from the mud tank 14. 15 and the like are transferred to the earth transport ship 16 and supplied to the solidification material mixing ship 8 using the earth transport ship 16.

  The solidifying material mixing ship 8 includes a mixer device 17 such as a pipe mixer installed on a carriage and a solidifying material supply device 18 for supplying a slurry-like solidifying material such as cement milk to the mixer device 17. The muddy water-like earth material slurry 7 is introduced into the hopper 17a from the ship 16 using the backhoe 19 and the like, and the muddy water-like earth material slurry 7 is supplied to the mixer device 17 from the hopper 17a every fixed amount, and the solidification material is supplied. The solidification material is supplied from the device 18 to the mixer device 17 at a predetermined ratio, the soil slurry 7 and the solidification material are mixed by the mixer device 17, and the solidification treatment in which the soil material, the solidification material, and water are mixed in a desired composition. Earth material is generated.

  The solidifying material supply device 18 includes control means using a computer, and supplies the solidifying material to the mixer device 17 while controlling the injection amount of the solidifying material by the control means.

  Further, the solidifying material mixing vessel 8 is provided with a water injection device 20 capable of pumping seawater so that the flow rate thereof can be adjusted and pouring the water into the earth transport vessel 16, and the muddy water-like soil material slurry 7 before being put into the mixer device 17. The wet density can be adjusted. In addition, the code | symbol 20a in a figure is a flow meter, Comprising: The water injection apparatus 20 adjusts flow volume based on the measured value of this flow meter 20a.

  Further, the solidifying material mixing ship 8 is provided with a pumping device, and can be supplied to the submerged vessel 4 in a state where the solidified soil material mixed and adjusted by the mixer device 17 is pressurized through the pumping tube 21. ing.

  The underwater driving vessel 4 is provided with a levee-building driving tube 5A or a blocking-setting driving tube 5B that is suspended by a crane device 4b installed on a carriage 4a with its lower end directed toward the bottom of the water. The tube 5A and the blocking casting tube 5B are appropriately selected and used.

  Each of the placement pipes 5A and 5B is connected to the end of the pressure feeding pipe 21 at the upper end, and is supplied into the pipe in a state where the solidified soil material is pressurized through the pressure feeding pipe 21.

  As shown in FIG. 4, the embankment construction placement pipe 5 </ b> A is provided with a diameter-expanded pipe portion 23 having a larger diameter than the placement pipe body 22 in the coaxial arrangement with the placement pipe body 22 at the lower end portion. Solidified soil material that has been pressurized through the main body 22 is supplied to the expanded diameter pipe portion 23.

  The expanded diameter pipe portion 23 is formed in a cylindrical shape having an open lower end, and is arranged on the peripheral wall portion 24 at intervals in the circumferential direction, and has a plurality of slit-like discharge ports 25, 25. Is formed.

  The discharge ports 25, 25... Are formed in a slit hole shape that extends vertically through the peripheral wall portion 24, and the lower end of the slit reaches the lower edge of the peripheral wall portion 24 and is continuous with the lower end opening 26. It is formed into a shape.

  Further, the diameter-expanded tube portion 23 is provided with a conical extrusion member 27 having an inclined surface 27a arranged at the bottom of the tube so as to face the discharge ports 25, 25. ing.

  As shown in FIGS. 4 (b) and 4 (c), this push-out member 27 is formed in a conical shape having a bottom surface diameter smaller than the diameter of the lower end opening 26 of the expanded diameter pipe portion 23, and the bottom surface position of the expanded diameter pipe portion 23. It is supported by the inner peripheral surface portion of the peripheral wall portion 24 through fixing members 28, 28.

  In the embankment construction casting pipe 5A configured as described above, by supplying the expanded solidified soil material to the expanded diameter pipe section 23 while being pressurized with the lower end of the expanded diameter pipe section 23 bottomed on the water bottom. The solidified soil material pressurized from the discharge ports 25, 25... Is pushed out radially in the horizontal direction.

  Further, in this embankment construction placing pipe 5A, the horizontal distance between the inclined surface 27a of the pushing member 27 and the inner peripheral surface of the enlarged diameter pipe portion 23 becomes narrower as it goes downward, and the solidified soil material is pushed out by that amount. The pressure becomes higher at the lower side of the discharge ports 25, 25..., And the solidified soil material extruded from the discharge port 22 has a mountain shape in cross section.

  As shown in FIG. 5, the sealing placement pipe 5 </ b> B includes a slidable end tube 31 at the lower end of the placement pipe main body 22, and the charged solidification soil material for sealing is inserted into the placement pipe main body 22 and the end. It flows down through the part cylinder 31.

  Also, the sealing driving tube 5B includes a plurality of rotating arms 32, 32... Pivotally mounted on the outer peripheral portion of the end tube 31 with a horizontal axis so as to be rotatable in the vertical direction. The elastic covering plates 33, 33... Made of rubber plates fixed to 32, 32.

  As shown in FIG. 5 (a), the covering plates 33, 33... Are formed in such a size that the side edges overlap with each other as the rotating arms 32, 32. A skirt-like shape is formed, and the covering plate 33, 33 ... covers the upper surface of the solidified soil material placed around the opening at the lower end, thereby restricting the lifting of the solidified soil material and solidifying the soil. The material spreads uniformly in all directions.

  Further, an inclinometer is fixed to each of the rotating arms 32, 32..., And its inclination is always displayed on a work boat on the water.

  Next, a specific procedure of this contaminated floating mud containment method will be described with reference to FIG.

  First, the submerged vessel 4 is moved to the water area where the contaminated floating mud C adsorbed with contaminants such as dioxin and cesium is deposited on the bottom A, and the solidified soil supply means, that is, the soil material adjustment ship 6 and The solidifying material mixing ship 8 is installed in a predetermined arrangement so that the solidified soil material can be supplied to the underwater placing ship 4.

  Next, the solidified soil material 40 for the bank with low fluidity is produced by the solidified soil material supply means, which is supplied to the underwater driving vessel 4, and the solidified soil material 40 for the bank is driven to form a plurality of Diffusion prevention levee 1,1 ... is constructed at the bottom A.

The embankment solidified soil material 40 is prepared by mixing a soil material such as bentonite, a solidified material such as blast furnace cement, fresh water, and seawater with the composition shown in Table 1, and is provided with slit-like discharge ports 25 and 25. ... A fluidity that can be pushed out, and a shape that does not separate in water and can maintain a certain shape when placed in water, that is, a bank The solidified soil material 40 is adjusted so that the wet density is about 1.10 (g / cm ³ ) and the underwater flow value (JHS A 313) is 90 mm or less.

  First, fresh water is stored in the water storage tank 12, and the fresh water is mixed with the soil material such as bentonite at a predetermined ratio by the pipe mixer 10, and the muddy water-like shape generated thereby is produced. The earth material slurry is discharged to the mud tank 14 and temporarily stored in the mud tank 14.

  Then, after this soil material slurry is swollen for a certain time (for example, 18 hours) in the state where the slurry is transferred to the mud storage tank 14 or to the soil ship 16, the swollen soil material slurry is then swollen. In this position, the water is transported to the solidification material mixing ship 8, and seawater is added to the soil material slurry on the soil transporting ship 16 at a predetermined ratio using the water injection device 20 and mixed using the backhoe 19.

Then, the conditioned soil material slurry is charged into the mixer device 17 using the backhoe 19, and the soil material slurry and the solidifying material are mixed by the mixer device 17, so that the embankment solidified soil material 40 is produced. .

  Next, in order to construct this embankment solidified soil material 40 on the bottom A and to construct a plurality of diffusion prevention dikes 1, 1,..., First, as shown in FIG. The lower end of the construction casting pipe 5A, that is, the bottom surface of the diameter-expanded pipe portion 23 is attached to the water bottom A, and the bank construction casting pipe 5A is fixed in this state.

  At that time, it is preferable that the work start position, that is, the bottom position of the first embankment construction placement pipe 5A is the corner of the bottom A area where the contaminated floating mud C to be contained is deposited.

  In this state, supply is started in a state where the embankment solidified soil material 40 is pressurized to the embankment construction pipe 5A, and as shown in the upper part of FIG. The embankment solidified soil material 40 is extruded radially (here, in eight directions) to form dam bodies 41, 41... Continuous in the radial direction (horizontal direction) (hereinafter, this operation is referred to as a levee construction operation).

  In this levee construction work, the levee solidified soil 40 is supplied to the discharge port 25, 25,... It is pushed out more vigorously to form the dam bodies 41, 41... Continuous in the radial direction.

  Further, in the lower end portion of the embankment construction placing pipe 5A, that is, in the enlarged diameter pipe portion 23, a conical extrusion with the top portion facing upward in an arrangement where the inclined surface 27a faces each discharge port 25, 25. Since the member 27 is provided, the embankment solidified soil material 40 is pushed out in a state in which the pushing pressure is higher in the lower part of the discharge ports 25, 25.

  Further, the embankment solidified soil material 40 pressed and extruded from the discharge ports 25, 25... Has fluidity that can be extruded from the slit-shaped discharge ports 25, 25. However, the embankments 41, 41 ... have a mountain-shaped cross section because they are in a state where they are difficult to separate in water when placed in water and have a fixed shape that can maintain a certain shape. The shape is formed in a continuous shape in the radial direction (horizontal direction).

  The mountain-shaped cross section of the dam bodies 41, 41 ... has a slope of 1: 3 or less, is formed in an upright state with a height of about several centimeters to several tens of centimeters, and has high fluidity. The contaminated floating mud C can be dammed up.

  Next, when the construction of the levee bodies 41, 41... Is completed, the underwater placing ship 4 is moved by raising the dam construction placing pipe 5A.

  And as shown in FIG.6 (b), the arrangement | sequence which encloses the contaminated floating mud C is performed by performing the above-mentioned series of bank construction work in several places where the bottom position of 5 A of installation pipes for bank construction is different. Are constructed to form a plurality of mud storage portions 2, 2 ... surrounded by the respective diffusion prevention dikes 1, 1 ... , 2 ... The contaminated floating mud C is taken in.

  In each levee construction work, the bottom positions of the embankment construction pipes 5A are set at positions spaced apart from each other in the radial direction, and the levee construction work is performed at each position so that the dams are connected to each other in the radial direction. .. Are formed, the pier bodies 41, 41... Extending in the radial direction are overlapped with each other in the push-out direction, and the two dam bodies 41, 41 continuous in the radial direction are integrated. The diffusion prevention bank 1 is constructed. Further, depending on the location, the diffusion prevention dam 1 is constituted by the dam body 41 alone.

  At that time, as the embankment solidification soil material 40 was pushed out radially in each embankment construction work, the surrounding contaminated floating mud C was pushed away by the extruded embankment solidification soil material 40 and constructed. It is taken in between each dam body 41, 41 ..., ie, the mud storage part 2, 2 ....

  The contaminated buoyant mud C taken into the mud storage units 2, 2 ... is concentrated in the mud storage units 2, 2 ... by being pushed away by the extruded solidification soil material 40 for embankments. As the embankment solidified soil 40 is solidified, the flow to the surroundings is blocked by the diffusion prevention dikes 1, 1.

  When all the embankment construction work is completed and the contaminated floating mud C in the containment area is completely taken into the mud storage units 2, 2,..., The embankment solidification treatment from the solidification soil supply means is performed. The supply of the earth material 40 is stopped, and the solidification processing earth material supply means is switched so that the highly solidified solidification earth material for sealing can be supplied. Is removed from the water, and the underwater driving vessel 4 is moved to the center of the area to be contained.

  Next, the solidified soil material for blockade 42 with high fluidity is produced by the solidified soil material supply means, and is supplied to the underwater casting vessel 4. The upper surface of each mud storage part 2,2 ... is sealed with the solidified soil material 42 for use, and the contaminated floating mud C is contained.

The solidification soil material for blockade 42 is produced by mixing a soil material such as bentonite, a solidification material such as blast furnace cement and seawater with the composition shown in Table 2, and has a certain fluidity while being submerged in water. In the state where it is not separated in water when it is placed in, ie, the solidified soil material 42 for sealing has a wet density of about 1.30 (g / cm ³ ) and an underwater flow value (JHS A 313) is Adjust to 100 mm or more.

  The solidification soil material 42 for sealing is prepared by first preparing seawater in the water storage tank 12, mixing seawater with a predetermined ratio of soil material such as bentonite by the pipe mixer 10, and generating muddy water. The soil slurry is discharged to the mud storage tank 14, temporarily stored in the mud storage tank 14, and then transferred to the earth transport ship 16, and transported to the solidification material mixing ship 8 by the earth transport ship 16.

  Then, the earth material slurry is put into the mixer device 17 using the backhoe 19, and the earth material slurry and the solidifying material are mixed by the mixer device 17, so that the solidified soil material 42 for sealing is produced.

  In order to place this solidifying soil material 42 for sealing on the mud storage units 2, 2,... And close the upper surface of each mud storage unit 2, 2,. The sealing placement pipe 5B is lowered into the water from the carriage 4a at the center position.

  At that time, the distal end of the placing tube is stopped at a height slightly separated from the upper surface of the mud storage portion 2, 2 ... so that the turning arms 32, 32 ... can turn, and in this state, the sealing pipe is sealed The injection of the solidifying soil material for blocking 42 into the placing tube 5B is started, and the filling is sequentially performed in a state of being filled with the solidifying soil material 42 for sealing up to a desired height in the placing tube main body 22.

  As a result, as shown in FIG. 6 (c), the sealing solidified soil material 42 flows out under the sealing placement tube 5B, and the flowing down solidified soil material 42 for sealing pushes open the covering plates 33, 33. The angles of the rotation arms 32, 32... Are rotated in a direction closer to the horizontal than the initial angle.

  In this state, the placement of the solidifying soil material 42 for sealing is continued, and the lower end of the sealing pipe 5B for sealing is placed in the solidifying soil material 42 for sealing that has flowed down and accumulated on the mud storage portions 2, 2,. The solidified soil material 42 for blocking is sequentially cast in a state where the material is buried.

  In that case, in addition to covering the upper surface of the solidification soil material 42 for sealing around the placement tube where the covering plates 33, 33 ... are placed, in addition to restricting the rise of the solidification soil material 42 for sealing, Since the solidifying soil material 42 for blocking has a certain fluidity, the entire area where the solidifying soil material 42 for blocking flows down on each of the mud storage portions 2, 2... Spread to. In addition, it is preferable that the solidification processing earth material 42 for blockage will be 1:10 or more in underwater gradient.

  Then, as the sealing solidified soil material 42 is solidified, as shown in FIG. 1, the sealing lid layer portion 3 that seals the upper surface portion of each of the mud storage portions 2, 2.

  In the contaminated floating mud containment method constructed in this way, a plurality of diffusion prevention dikes 1, 1... Composed of the embankment solidification soil 40 including a solidification material are constructed, and each diffusion prevention dike 1, 1.. .. By incorporating contaminated buoyant mud C into the mud storage units 2, 2 ..., the moisture content is as high as several 100% to several 1000%, and the shear strength is substantially zero. Since the contaminated floating mud C is blocked by the respective diffusion prevention dikes 1, 1,..., It is possible to prevent the floating mud containing pollutants from spreading around.

  In addition, the contaminated floating mud C is taken into the mud storage units 2, 2 ..., and the upper surface of the mud storage units 2, 2 ... is sealed with the solidifying soil material 42 for sealing. Since the load of the solidified soil 42 is supported by the respective diffusion prevention dikes 1, 1..., The solidification for sealing that acts on the contaminated floating mud C when the solidified soil 42 for sealing is placed and after containment. The pressure caused by the treated soil material 42 can be greatly reduced, thereby preventing the diffusion of contaminated floating mud C having high fluidity.

  Furthermore, since each solidified soil material is solidified, the contaminated floating mud C is firmly contained by the respective diffusion prevention dikes 1, 1... And the sealing lid layer portion 3, so that high durability can be obtained. It has become.

  In addition, the aspect of a solidification processing soil material supply means is not limited to the above-mentioned Example, For example, the soil material adjustment ship 6 and the solidification material mixing ship 8 are integrated into one trolley, and the conveyance by the earth transport ship 16 is carried out. Work may be omitted.

  Moreover, in the above-mentioned Example, the example which used the embankment construction casting pipe 5A as shown in FIG. 4 and formed the levee bodies 41, 41 ... radially in eight directions in each dam construction work was explained. However, the present invention is not limited to such a configuration. For example, the pushing direction of the embankment solidified soil material 40 may be two directions, four directions, or other plural directions, and the embankment as shown in FIG. The diffusion prevention dike 1, 1... May be constructed one by one by placing the embankment solidified soil material by an existing method without using the construction placing pipe 5A.

A Water bottom B Water surface C Contaminated floating mud 1 Diffusion prevention dike 2 Mud storage part 3 Sealed lid layer part 4 Underwater placement ship 5A Levee placement pipe 5B Sealing placement pipe 6 Soil material adjustment ship 7 Earth material slurry 8 Solidification Material Mixing Ship 10 Pipe Mixer 11 Soil Material Supply Device 12 Water Storage Tank 13 Water Supply Device 14 Mud Storage Tank 15 Pump 16 Earth Transport Ship 17 Mixer Device 18 Solidification Material Supply Device 19 Backhoe 20 Water Injection Device 21 Pressure Feeding Pipe 22 Placing Pipe Body 23 Expanded tube portion 24 Peripheral wall portion 25 Discharge port 26 Lower end opening 27 Extruding member 28 Fixing member 31 End tube 32 Rotating arm 33 Cover plate 40 Solidification soil material 41 for embankment 41 Solidification soil material for embankment 42

Claims (2)

  A low-fluidity solidified soil for embankment containing solidification material is placed at the bottom of the water where contaminated floating mud containing pollutants is deposited, and a plurality of diffusion prevention dikes are constructed in an arrangement surrounding the contaminated floating mud. Forming one or a plurality of mud storage parts surrounded by the diffusion prevention dike, taking the contaminated floating mud into each mud storage part, damming the contaminated floating mud with the diffusion prevention dike, and then A solidified soil for sealing containing a solidifying material is placed on each mud storage part, and the upper surface of each mud storage part is sealed with the solidified soil for sealing. Containment method.   The solidifying soil material for blockade has a certain fluidity, and the solidified soil material for blockade is allowed to flow down on each of the mud storage portions through a sealing placement tube inserted in water, and the flow is lowered to 2. The flotation float according to claim 1, wherein the sealing solidification soil material is sequentially placed in a state where the bottom end of the sealing placement pipe is embedded in the solidification soil material for sealing deposited on each mud reservoir. Mud containment method.

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