WO2022185860A1 - 水底資源の採取システムおよび採取方法 - Google Patents
水底資源の採取システムおよび採取方法 Download PDFInfo
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- WO2022185860A1 WO2022185860A1 PCT/JP2022/004959 JP2022004959W WO2022185860A1 WO 2022185860 A1 WO2022185860 A1 WO 2022185860A1 JP 2022004959 W JP2022004959 W JP 2022004959W WO 2022185860 A1 WO2022185860 A1 WO 2022185860A1
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- Prior art keywords
- pipe
- mud
- water
- stirring blade
- lifting
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 19
- 238000003780 insertion Methods 0.000 claims abstract description 287
- 230000037431 insertion Effects 0.000 claims abstract description 287
- 238000003756 stirring Methods 0.000 claims abstract description 227
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 143
- 239000007788 liquid Substances 0.000 claims abstract description 102
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims description 45
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 230000001629 suppression Effects 0.000 claims description 32
- 238000000605 extraction Methods 0.000 claims description 22
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 15
- 239000000839 emulsion Substances 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 239000013535 sea water Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C50/00—Obtaining minerals from underwater, not otherwise provided for
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
Definitions
- the present invention relates to a bottom-of-water resource collection system and a bottom-of-water resource collection method, and more particularly to a bottom-of-water resource collection system and collection method capable of efficiently collecting bottom-of-water resources contained in the mud of the bottom ground.
- Patent Document 1 Conventionally, various systems have been proposed for excavating and collecting mud from the bottom of water (see Patent Document 1).
- a recovery hopper provided at the lower portion of the lifting pipe portion faces the ground surface of the underwater ground.
- an emulsion (oil mixed with a surfactant) with a specific gravity lighter than that of seawater is sprayed from the nozzle at the bottom of the bit to clear the mud of the bottom of the sea.
- emulsion oil mixed with a surfactant
- An object of the present invention is to provide a bottom water resource collection system and a bottom water collection method that can efficiently collect water bottom resources contained in the mud of the bottom ground.
- a first bottom-of-water resource extraction system of the present invention is a bottom-of-water resource extraction system for excavating mud in the bottom ground containing bottom-of-water resources and pumping up the above-mentioned from the water surface.
- a lifting/storage pipe extending toward the seabed ground; an insertion pipe connected to a lower portion of the lifting/storage pipe; , a stirring blade attached to the lower part of the rotating shaft and arranged inside the insertion tube, and a liquid supply mechanism for supplying liquid to the inside of the insertion tube, wherein at least the lower part of the insertion tube is the The liquid is supplied to the inside of the insertion tube by the liquid supply mechanism in a state of being inserted into the submerged ground, and the agitating blade that rotates with the rotation of the rotating shaft moves the inside of the insertion tube to the inside of the insertion tube.
- Mud is excavated and thawed, and the slurried mud by the thaw rises to the upper part of the insertion pipe by the stirring flow generated by the rotation of the stirring blade, and the slurry-like mud that has risen rises. is lifted onto the water through the lifting pipe by lifting means.
- a second bottom-of-water resource extraction system of the present invention is a bottom-of-water resource extraction system for excavating mud in the bottom-of-water ground containing bottom-of-water resources and pumping it up to the surface of the water.
- an insertion tube connected to the lower part of the lifting and storing tube; a rotating shaft extending in the tube axial direction inside the lifting and storing tube and the inserted tube; and a lower part of the rotating shaft
- a stirring blade attached to and arranged inside the insertion tube, a liquid supply mechanism that supplies liquid to the inside of the insertion tube, and a liquid supply mechanism that is arranged inside the insertion tube and when the rotating shaft rotates wherein the liquid is supplied to the inside of the insertion pipe by the liquid supply mechanism in a state where at least the lower part of the insertion pipe is inserted into the underwater ground,
- the mud inside the insertion pipe is excavated and demulsified by the stirring blades rotating with the rotation of the rotating shaft in a state in which the shaft shaking of the rotating rotating
- a first bottom-of-water resource extraction method of the present invention is a bottom-of-water resource extraction method in which mud in the bottom-of-water ground containing the bottom-of-water resource is excavated and lifted onto the water, wherein A pipe is extended, and in a state where at least the lower part of the insertion pipe connected to the lower part of the lifting and receiving pipe is inserted into the underwater ground, liquid is supplied to the inside of the insertion pipe, and the lifting and receiving pipe and the By rotating the rotating shaft extending in the direction of the tube axis inside the insertion tube and rotating the stirring blade attached to the lower part of the rotating shaft inside the insertion tube, the inside of the insertion tube
- the mud is excavated and demulsified, and the mud made into slurry by the dissolution is raised to the upper part of the insertion pipe by the stirring flow generated by the rotation of the stirring blade, and the raised slurry is raised. It is characterized in that the mud is lifted onto the water through the lifting pipe by a lifting means.
- a second method for extracting bottom water resources of the present invention is a method for extracting bottom water resources by excavating mud in the bottom water ground containing the bottom water resources and lifting the muddy soil onto the water surface.
- a pipe is extended, and in a state where at least the lower part of the insertion pipe connected to the lower part of the lifting and receiving pipe is inserted into the underwater ground, liquid is supplied to the inside of the insertion pipe, and the lifting and receiving pipe and the While rotating the rotating shaft extending in the direction of the tube axis inside the insertion tube, the rotation shaft is rotated in a state in which the shaft deflection is suppressed by the shaft deflection suppressing means arranged inside the insertion tube.
- the stirring blade attached to the lower part inside the insertion pipe By rotating the stirring blade attached to the lower part inside the insertion pipe, the mud inside the insertion pipe is excavated and demulsified, and the mud made into a slurry by the dissolution is transferred to the insertion pipe. and the raised slurry-like mud is lifted onto the water through the lifting pipe by lifting means.
- the liquid is supplied to the inside of the insertion pipe inserted into the waterbed ground, and the stirring blade is rotated to excavate and disaggregate the mud of the waterbed ground inside the insertion pipe, thereby producing a relatively small amount of liquid.
- This allows the mud to be effectively comminuted into a slurry and lifted up to the top of the insertion tube. Therefore, bottom water resources contained in the mud can be efficiently collected.
- a stirring flow is generated inside the insertion pipe by rotating the stirring impeller while supplying water to the inside of the insertion pipe.
- the finely disaggregated slurry-like mud is easily lifted up to the top of the insertion pipe along with the stirring flow. Therefore, the mud on the bottom of the water can be efficiently lifted up with a relatively small amount of liquid.
- the second bottom-of-water resource extraction system and extraction method by suppressing the axial deflection of the rotating shaft by the axial deflection suppressing means arranged inside the insertion tube, the mud can be stably finely granulated and lifted up. be advantageous.
- FIG. 1 is an explanatory diagram illustrating an outline of an embodiment of a bottom water resource extraction system of the present invention.
- FIG. 2 is an explanatory diagram illustrating the inside of the insertion tube of FIG. 1 in plan view.
- FIG. 3 is an explanatory view illustrating the inside of the insertion tube as viewed from arrow A in FIG. 2 .
- FIG. 4 is an explanatory diagram illustrating the inside of the insertion tube as viewed from arrow B in FIG. 2 .
- FIG. 5 is an explanatory diagram illustrating a state in which the insertion tube of FIG. 1 is inserted into the sea bed.
- FIG. 6 is an explanatory diagram illustrating a state in which the stirring impeller has penetrated to a predetermined depth in the seabed ground from the state in FIG. 5 .
- FIG. 7 is an explanatory diagram illustrating a state in which the stirring blade is reciprocated in the tube axis direction inside the insertion tube from the state in FIG. 6 .
- FIG. 8 is an explanatory diagram illustrating an outline of another embodiment of the bottom water resource extraction system of the present invention.
- FIG. 9 is an explanatory diagram illustrating the inside of the insertion tube of FIG. 8 in plan view.
- FIG. 10 is an explanatory diagram illustrating the inside of the insertion tube in the C arrow view of FIG. 9 .
- FIG. 11 is an explanatory diagram illustrating the inside of the insertion tube as viewed from arrow D in FIG. 9 .
- FIG. 12 is an explanatory diagram illustrating a state in which the insertion tube of FIG. 8 is inserted into the sea bed.
- FIG. 9 is an explanatory diagram illustrating the inside of the insertion tube of FIG. 8 in plan view.
- FIG. 10 is an explanatory diagram illustrating the inside of the insertion tube in the C arrow view
- FIG. 13 is an explanatory diagram illustrating a state in which the stirring impeller has penetrated to a predetermined depth in the submerged ground from the state of FIG. 12 .
- 14 is an explanatory diagram illustrating a state in which the stirring blade is reciprocated in the tube axis direction inside the insertion tube from the state in FIG. 13.
- FIG. 15 is an explanatory diagram illustrating an outline of still another embodiment of the bottom-water resource extraction system of the present invention.
- FIG. 16 is an explanatory diagram illustrating the inside of the insertion tube of FIG. 15 in plan view.
- the bottom-of-water resource extraction system and extraction method of the present invention will be described based on the embodiments shown in the drawings.
- the mud of the bottom of the water containing the bottom of the water resources (mineral resources) such as rare earths is excavated and collected on the water.
- a bottom water resource extraction system 1 (hereinafter referred to as a bottom water resource extraction system 1) of the present invention illustrated in FIG. and a rotating shaft 4 extending inside the lift-and-storage tube 2 and the insertion tube 3 in the tube axial direction.
- the collection system 1 further includes a stirring blade 6 attached to the lower portion of the rotating shaft 4 and a liquid supply mechanism 8 for supplying the liquid L into the insertion tube 3 .
- This embodiment exemplifies the case where the lifting pipe 2 is connected to the lifting and receiving ship 20 on the water, but it is not limited to the lifting and receiving ship 20.
- the lifting and receiving pipe 2 is provided on the water. It can also be configured to be connected to a facility or the like.
- the lift-and-storage pipe 2 and the insertion pipe 3 are in communication.
- the inner diameter of the insertion tube 3 is set larger than the inner diameter of the lift-and-storage tube 2 .
- the inner peripheral surface of the connecting portion between the lifting tube 2 and the insertion tube 3 has a smoothly continuous curved shape.
- the inner diameter of the lift-and-storage tube 2 is set, for example, within a range of 0.2 m or more and 1.0 m or less
- the inner diameter of the insertion tube 3 is set, for example, within a range of 0.5 m or more and 5 m or less.
- a lifting means is connected to the lifting pipe 2 for lifting the mud S raised to the upper part of the insertion pipe 3 through the lifting pipe 2 to the surface of the water.
- the pumping means is composed of, for example, an air lift pump, a slurry pump, or the like.
- the insertion pipe 3 When collecting the mud S of the waterbed ground B, the insertion pipe 3 is in a state in which at least the lower part thereof is inserted into the waterbed ground B, and the upper part of the insertion pipe 3 protrudes upward from the surface of the waterbed ground B. .
- 50% or more of the total length of the insertion pipe 3 is inserted into the seabed ground B.
- the length of the insertion tube 3 in the tube axis direction is appropriately set according to the depth of the stratum in which the submerged resources are distributed.
- an annular stopper 3a is provided on the outer peripheral surface of the insertion tube 3 in plan view.
- the rotating shaft 4 is suspended from the lifting and receiving ship 20 by inserting the lifting and receiving tube 2 and the insertion tube 3, and is rotated by the drive mechanism.
- a stirring blade 6 is attached to a head 5 that is detachably connected to the lower portion of a rotating shaft 4.
- An excavating edge 7 for excavating the mud S of the water bottom ground B is provided at the lower end of the head 5 .
- a group of agitating blades 6 composed of a plurality of agitating blades 6 is provided on the outer peripheral surface of the head 5 located above the excavating blade 7 .
- Each stirring blade 6 extends toward the inner peripheral surface of the insertion tube 3 .
- a plurality of stirring blades 6 constituting the same stirring blade group are arranged at intervals in the circumferential direction of the rotating shaft 4 .
- Each stirring blade 6 in this embodiment is formed in a flat plate shape and has a tapered shape that tapers from the root portion connected to the rotating shaft 4 (head 5) toward the tip.
- the front end portion of the stirring blade 6 in the rotation direction is sharply pointed.
- the front end portion of the stirring blade 6 can be formed in a sawtooth shape with continuous peaks and valleys.
- the stirring impeller 6 is not limited to a flat plate shape, and can be curved like a screw blade, for example.
- a stirring blade group composed of two stirring blades 6 arranged at opposing positions is provided in three stages in the axial direction of the rotating shaft 4 .
- Each of the stirring blades 6 constituting the lowest stage stirring blade group is inclined downward in the direction of rotation.
- Each of the stirring blades 6 constituting the middle stirring blade group and the uppermost stirring blade group is inclined upward in the direction of rotation.
- the angle ⁇ (depression angle) between the axial direction of the rotating shaft 4 and the extending direction of the stirring blades 6 is, for example, 10 degrees or more and 80 degrees or less, preferably 20 degrees or more and 70 degrees or less. It is preferably set within the range of 25 degrees or more and 40 degrees or less.
- the stirring blades 6 adjacent to each other in the axial direction of the rotating shaft 4 are arranged at positions shifted in the circumferential direction of the rotating shaft 4 in plan view.
- a gap (clearance) of about 50 mm to 500 mm is provided between the inner peripheral surface of the insertion tube 3 and the tip of the stirring blade 6 .
- the rotation speed of the stirring blade 6 (rotating shaft 4) is, for example, 10 rpm to 200 rpm.
- the number of stages of the stirring blade group provided in the axial direction of the rotating shaft 4 and the number of the stirring blades 6 constituting each stage of the stirring blade group are not limited to this embodiment, and can be configured differently.
- the stirring blades 6 constituting each stirring blade group are preferably arranged so as to be point-symmetrical about the axis of the rotating shaft 4 in plan view.
- the direction of inclination of the stirring blades 6 constituting the stirring blade groups of each stage is not limited to this embodiment. A downward sloping configuration is also possible.
- the liquid supply mechanism 8 supplies water (seawater or freshwater) as the liquid L, for example. It is convenient to use on-site water (sea water or fresh water) that is available on-site.
- the liquid L for example, a liquid obtained by adding an additive to water, or a liquid other than water may be supplied.
- the liquid supply mechanism 8 of this embodiment has a jet nozzle 8 a provided at the tip of the stirring blade 6 . Each injection nozzle 8 a injects the liquid L toward the inner peripheral surface of the insertion tube 3 .
- a liquid supply device installed on the surface of the water (ship 20) supplies liquid L to each injection nozzle 8a through a main pipe extending inside the rotating shaft 4 and a plurality of pipes 8b branched from the lower part of the main pipe. is supplied.
- the injection nozzle 8a and the pipe 8b are attached to the surface on the rear side of the stirring blade 6 with respect to the rotation direction of the stirring blade 6.
- the jet nozzle 8a and the pipe 8b may be installed in the stirring blade 6 so that the liquid L is jetted from the tip of the stirring blade 6 .
- all the stirring blades 6 are provided with the injection nozzles 8a, but some of the stirring blades 6 can be selectively provided with the injection nozzles 8a. That is, for example, the injection nozzle 8a can be provided only for each stirring blade 6 that constitutes the lowest stage stirring blade group.
- the injection nozzles 8a are selectively provided in some of the stirring blades 6, the injection nozzles 8a provided in each stage should be arranged so as to be point-symmetrical about the axis of the rotating shaft 4 in plan view. is preferred.
- the liquid supply mechanism 8 may have any structure as long as it can supply the liquid L into the insertion tube 3, and is not limited to the structure of this embodiment.
- a discharge nozzle for discharging the liquid L can be provided in the lower portion (head 5 ) of the rotating shaft 4 arranged inside the insertion tube 3 .
- the insertion tube 3 is connected to the lower part of the lift-and-storage tube 2, and the head 5 is detachably fixed inside the upper part of the insertion tube 3. Then, as exemplified in FIG. 5, the lifting pipe 2 is extended from the surface of the water (lifting and collecting ship 20) toward the sea bottom ground B, and at least the lower part of the insertion pipe 3 connected to the lower part of the lifting pipe 2 is inserted into the waterbed ground B. At this time, the upper part of the insertion tube 3 containing the head 5 is not inserted into the waterbed ground B, and the head 5 is arranged above the surface of the waterbed ground B.
- the inside of the lower part of the insertion pipe 3 inserted into the waterbed ground B is filled with the mud S of the waterbed ground B.
- the inside of the upper part of the insertion pipe 3, which is not inserted into the seabed ground B, is filled with the water W of the water area.
- the insertion pipe 3 when the insertion pipe 3 is inserted into the seabed ground B to a position where the stopper 3a provided on the outside of the insertion pipe 3 contacts the ground surface of the seabed ground B, the depth of the stratum where the waterbed resources are distributed is reached.
- the lower part of the insertion tube 3 is inserted.
- the upper part of the insertion tube 3 in which the head 5 is housed protrudes above the ground surface of the submerged ground B.
- the rotating shaft 4 is lowered from the surface of the water (the hoisting and recovering vessel 20) toward the seabed B while being inserted into the inside of the hoisting pipe 2 and the insertion pipe 3, and the head 5 is attached to the lower end of the rotating shaft 4. (Stirring blade 6) is connected. With the head 5 connected to the lower end of the rotary shaft 4 , the head 5 is removed from the insertion tube 3 when the rotary shaft 4 is further moved downward toward the submerged ground B. As a result, the head 5 (stirring blade 6) integrated with the rotating shaft 4 becomes movable in the direction of the tube axis.
- the liquid supply mechanism 8 supplies the liquid L into the insertion tube 3 and rotates the rotating shaft 4 .
- the stirring blade 6 attached to the lower part (head 5) of the rotating shaft 4 inside the insertion pipe 3
- the mud S inside the insertion pipe 3 is excavated and demulsified.
- the mud S made into a slurry by the demulsification is raised to the upper part of the insertion pipe 3 by the stirring flow generated by the rotation of the stirring blade 6, and the raised slurry-like mud is raised. S is lifted onto the water (lifting ship 20) through the lifting pipe 2 by the lifting means.
- the injection nozzle 8a starts to inject the liquid L, and the rotating shaft 4 is driven to rotate. to rotate the stirring blade 6.
- the rotating stirring blade 6 is moved from the surface of the submerged ground B to a predetermined depth. to excavate the mud S inside the insertion pipe 3.
- the mud S is excavated to the depth of the middle position of the insertion pipe 3 without excavating to a position deeper than the lower end 3 b of the insertion pipe 3 .
- the rotating impeller 6 excavates the mud S on the center side of the insertion tube 3, and the mud S between the tip of the agitation impeller 6 and the inner peripheral surface of the insertion tube 3 is excavated by the liquid L injected at high pressure from the injection nozzle 8a. be excavated.
- each stirring blade 6 that constitutes the lowest stage stirring blade group is inclined downward in the direction of rotation. Therefore, the mud S excavated by the stirring blades 6 constituting the lowest stirring blade group moves upward, and the mud S that has moved upward constitutes the middle stirring blade group and the top stirring blade group 6. is further refined by
- the rotating stirring blade 6 is reciprocated a plurality of times in the axial direction of the insertion tube.
- the mud S inside 3 is repeatedly disintegrated.
- the mud S inside the insertion pipe 3 is further finely granulated, and the finely granulated mud S inside the insertion pipe 3 is mixed with the liquid inside the insertion pipe 3 (the water W in the water area and the liquid supply mechanism 8).
- the inside of the insertion tube 3 is filled with slurry-like mud S.
- the mud S of the water bottom ground B is excavated and demulsified inside the insertion tube 3. Mud S can be effectively pulverized with a relatively small amount of liquid. Furthermore, by generating a stirring flow inside the insertion tube 3 by rotating the stirring blade 6, the mud S finely granulated inside the insertion tube 3 becomes difficult to settle and rises toward the top of the insertion tube 3. becomes easier. Therefore, the mud S of the water bottom ground B can be efficiently lifted up and collected with a relatively small amount of liquid, and the water bottom resources contained in the mud S can be efficiently collected.
- the lifting means operated while rotating the stirring blade 6 to lift the slurry-like mud S on the water through the lifting pipe 2, but after stopping the rotation of the stirring blade 6, the lifting means The slurry-like mud S can also be lifted up and collected on the water by operating only.
- the inner diameter of the lifting pipe 2 used in the deep sea is small, and the gap between the inner peripheral surface of the lifting pipe 2 and the rotating shaft 4 is relatively narrow, but the mud S inside the insertion pipe 3 has a small amount of soil mass. Since it flows into the lifting/storage pipe 2 in a fine-grained state, the mud S is less likely to clog the suction/storage pipe 2. ⁇ Therefore, troubles are unlikely to occur in the lifting pipe 2, and the mud S of the water bottom ground B can be lifted up and collected very smoothly.
- the liquid L is supplied to the inside of the insertion tube 3 to excavate and disintegrate the mud S inside the insertion tube 3, the liquid L does not flow outside the insertion tube 3 even when a liquid other than water is supplied as the liquid L. It is difficult to flow out into the water.
- the rotation speed of the stirring blades 6 should be 20 rpm or more, more preferably 40 rpm or more.
- the rotational speed of the stirring blades 6 must be increased accordingly.
- the upper limit of the rotation speed is, for example, about 80 rpm or 60 rpm.
- each of the stirring blades 6 constituting the lowest stage stirring blade group is configured to be inclined downward in the direction of rotation, the stirring blades 6 constituting the lowest stage stirring blade group excavate and desludge.
- the sludge S thus formed moves upward and is further disintegrated by the stirring blades 6 constituting the stirring blade group in the upper stage. Therefore, the mud S can be finely granulated very efficiently.
- the mud S excavated and demulsified by the stirring blades 6 constituting the lowest stirring blade group and the liquid inside the insertion pipe 3 are inserted from the lower opening of the insertion pipe 3.
- the stirring blades 6 constituting the lowest stage stirring blade group generate a stirring flow in which the mud S easily rises inside the insertion pipe 3, the demulsified mud S flows toward the upper part of the insertion pipe 3. easier to rise.
- each of the stirring blades 6 constituting the uppermost stirring blade group is configured to be inclined upward in the direction of rotation, the mud S that collides with the uppermost stirring blade 6 moves downward and moves downward. It is further disaggregated by the stirring blades 6 of the stages. Therefore, it is advantageous for efficiently refining the mud S.
- each of the stirring blades 6 constituting the uppermost stirring blade group is configured to be inclined downward in the direction of rotation, the uppermost stirring blade group 6 will displace inside the insertion tube 3. A churning flow is generated in which the muddy soil S easily rises. Therefore, the loosened mud S easily rises toward the upper portion of the insertion pipe 3 .
- the respective stirring blades 6 constituting the lowest stage stirring blade group and the highest stage stirring blade group are inclined downward in the direction of rotation, and the lowest stage stirring blade group and the highest stage stirring blade group It is also possible to adopt a configuration having a middle-stage stirring blade group in which the stirring blades 6 are inclined upward in the direction of rotation between them. With this configuration, the mud S can easily move between the lowermost stage stirring blade group and the middle stage stirring blade group, so that the mud S can be efficiently refined. Furthermore, since the stirring blade group at the uppermost stage generates a stirring flow in which the mud S easily rises inside the insertion pipe 3 , the disintegrated mud S easily rises toward the lifting pipe 2 .
- the mud S is more likely to be finely granulated.
- the deposited mud S is less likely to settle due to the lower portion of the insertion tube 3 .
- the amount of mud S remaining adhering to the inner peripheral surface of the insertion pipe 3 after the mud S inside the insertion pipe 3 has been lifted up is reduced. Therefore, even when the mud S is lifted up and collected several times by changing the insertion position of the insertion pipe 3, the resistance when inserting the insertion pipe 3 into a new position of the water bottom ground B does not increase, and the insertion pipe 3 can be inserted smoothly. It is also possible to reduce the labor required for maintenance of the insertion tube 3 after finishing the pick-up work.
- the agitating blades 6 After penetrating the agitating blades 6 from the new surface of the submerged ground B to a predetermined depth to excavate the mud S inside the insertion pipe 3, the agitating blades 6 are reciprocated in the pipe axis direction a plurality of times inside the insertion pipe 3.
- the mud S inside the insertion tube 3 can be finely granulated more reliably by repeatedly dissolving the mud S with the Further, it is possible to more effectively prevent the mud S finely granulated inside the insertion pipe 3 from settling in the lower part of the insertion pipe 3, and the mud S inside the insertion pipe 3 can be lifted up and collected more reliably.
- the number of times the stirring blades 6 are reciprocated inside the insertion tube 3 can be appropriately determined according to the hardness of the mud S of the submerged ground B, the number of the stirring blades 6, and the like. Specifically, for example, it is preferable to reciprocate the stirring blade 6 inside the insertion tube 3 about 2 to 15 times.
- the moving speed of the stirring blades 6 in the tube axis direction can be appropriately set according to the hardness of the mud S of the water bottom ground B.
- the moving speed of the stirring impeller 6 in the tube axis direction is preferably set within the range of 1 mm/sec to 100 mm/sec, more preferably 1 mm/sec to 10 mm/sec.
- the moving speed of the stirring blades 6 in the pipe axis direction inside the insertion pipe 3 is faster than the moving speed of the stirring blades 6 in the pipe axis direction when excavating from the surface to a predetermined depth at a new position in the submerged ground B. It is preferable to set the moving speed of the stirring blade 6 in the direction of the pipe axis to be high when reciprocating in the direction multiple times.
- the mud S of the waterbed ground B is not demulsified, and the load applied to the agitating blade 6 is relatively large.
- the moving speed of the stirring blades 6 in the direction of the tube axis to be relatively slow to excavate the submerged ground B, it is possible to avoid applying an excessive load to the stirring blades 6 .
- the mud S that has been excavated once is in a state of being demulsified to some extent, and the load applied to the stirring blades 6 is relatively small. Therefore, when the mud has been demulsified compared to the beginning of excavation, the mud S inside the insertion tube 3 can be efficiently demulsified by setting the moving speed of the stirring blade 6 in the tube axis direction to be high. can.
- Fig. 8 illustrates the collection system 1 of another embodiment of the present invention.
- the sampling system 1 of this embodiment includes a lift-and-storage pipe 2 extending from the water surface toward the seabed ground B, an insertion pipe 3 connected to the lower part of the lift-and-storage pipe 2, and the lift-and-storage pipe 2 and the insertion pipe 3. and a rotary shaft 4 extending in the tube axial direction.
- the sampling system 1 further includes an agitating blade 6 attached to the lower portion of the rotating shaft 4, a liquid supply mechanism 8 that supplies the liquid L to the inside of the insertion tube 3, and a shaft shake suppressor arranged inside the insertion tube 3. means 9;
- the structures of the lifting tube 2, the insertion tube 3, the rotary shaft 4, the stirring blade 6, and the liquid supply mechanism 8 are the same as those of the previously illustrated embodiments.
- the shaft vibration suppressing means 9 is arranged inside the insertion tube 3 and suppresses shaft vibration when the rotating shaft 4 rotates.
- the axial vibration suppressing means 9 has a contact portion 10 capable of contacting the inner peripheral surface of the insertion tube 3 . Even if the contact part 10 is designed to always contact the inner peripheral surface of the insertion tube 3, it is designed to contact the inner peripheral surface of the insertion tube 3 only when the rotating shaft 4 is bent beyond the allowable range. good too.
- an elastic member extending from the tip portion of the stirring blade 6 to the inner peripheral surface of the insertion tube 3 is provided as the contact portion 10 constituting the shaft vibration suppressing means 9 .
- the elastic member is composed of, for example, a plate-like member made of an elastic material such as rubber or resin.
- all the stirring blades 6 are provided with elastic members, but for example, some of the stirring blades 6 can be selectively provided with elastic members. Even if elastic members are selectively provided on some of the stirring blades 6, the elastic members provided on each stage are preferably arranged at positions that are point-symmetrical about the axis of the rotating shaft 4 in plan view. .
- the stirring blades 6 and the elastic members attached to the stirring blades 6 are inclined in the same direction. That is, the elastic members provided on the respective stirring blades 6 constituting the lowest stage stirring blade group are inclined downward in the direction of rotation. The elastic members provided on the respective stirring blades 6 constituting the middle and uppermost stirring blade groups are inclined upward in the direction of rotation.
- the insertion tube 3 is connected to the lower part of the lift-and-storage tube 2, and the head 5 is detachably fixed inside the upper part of the insertion tube 3.
- the lifting pipe 2 is extended from the surface of the water (lifting and collecting ship 20) toward the sea bottom ground B, and at least the lower part of the insertion pipe 3 connected to the lower part of the lifting pipe 2 is inserted into the waterbed ground B.
- the upper part of the insertion tube 3 containing the head 5 is not inserted into the waterbed ground B, and the head 5 is arranged above the surface of the waterbed ground B.
- the inside of the lower part of the insertion pipe 3 inserted into the waterbed ground B is filled with the mud S of the waterbed ground B.
- the inside of the upper part of the insertion pipe 3, which is not inserted into the seabed ground B, is filled with the water W of the water area.
- the insertion pipe 3 when the insertion pipe 3 is inserted into the seabed ground B to a position where the stopper 3a provided on the outside of the insertion pipe 3 contacts the ground surface of the seabed ground B, the depth of the stratum where the waterbed resources are distributed is reached.
- the lower part of the insertion tube 3 is inserted.
- the upper part of the insertion tube 3 in which the head 5 is housed protrudes above the ground surface of the submerged ground B.
- the rotating shaft 4 is lowered from the surface of the water (the hoisting and recovering vessel 20) toward the seabed B while being inserted into the inside of the hoisting pipe 2 and the insertion pipe 3, and the head 5 is attached to the lower end of the rotating shaft 4. (Stirring blade 6) is connected. With the head 5 connected to the lower end of the rotary shaft 4 , the head 5 is removed from the insertion tube 3 when the rotary shaft 4 is further moved downward toward the submerged ground B. As a result, the head 5 (stirring blade 6) integrated with the rotating shaft 4 becomes movable in the direction of the tube axis.
- the liquid supply mechanism 8 supplies the liquid L into the insertion tube 3 and rotates the rotating shaft 4 .
- the stirring blade 6 attached to the lower part (head 5) of the rotating shaft 4 inside the insertion pipe 3
- the mud S inside the insertion pipe 3 is excavated and demulsified.
- the axial vibration of the rotating shaft 4 is suppressed by the shaft vibration suppressing means 9 arranged inside the insertion tube 3 .
- the mud S made into a slurry by the demulsification is raised to the upper part of the insertion pipe 3 by the stirring flow generated by the rotation of the stirring blade 6, and the raised slurry-like mud is raised. S is lifted onto the water (lifting ship 20) through the lifting pipe 2 by the lifting means.
- each of the stirring blades 6 and elastic members that constitute the lowest stage stirring blade group is inclined downward in the direction of rotation. Therefore, the mud S that has been excavated and thawed by the stirring blades 6 and the elastic member that constitute the lowest stage stirring blade group moves upward, and the upwardly moved mud S moves from the middle stage stirring blade group and the uppermost stage stirring blade group. is further finely granulated by the stirring blades 6 constituting the
- each elastic member When the mud S is excavated and thawed, the tip of each elastic member is in contact with the inner peripheral surface of the insertion tube 3 and is bent or compressed. A state is created in which an urging force directed toward the center of the shaft is applied.
- the urging force applied by the elastic member keeps the rotation shaft 4 centered on the tube axis of the insertion tube 3, thereby suppressing the movement of the rotation shaft 4 in the direction perpendicular to the tube axis direction (shaft shake).
- the eccentricity of the rotating shaft 4 is suppressed, the eccentricity of the rotating stirring blade 6 is also suppressed.
- the rotating shaft 4 When extracting submarine resources, the rotating shaft 4 will be considerably long. When the lower end portion of the rotating shaft 4 is pressed against the submerged ground B, the rotating shaft 4 is bent and deformed, and the shaft center position is shifted to be eccentric. When the degree of eccentricity increases, normal stirring by the stirring blades 6 becomes impossible. Therefore, in order to stably ensure the performance of the sampling system 1, the axial vibration suppressing means 9 (contact portion 10) functions extremely effectively.
- the rotating stirring blade 6 is reciprocated a plurality of times in the axial direction of the insertion tube.
- the mud S inside 3 is repeatedly disintegrated.
- the mud S inside the insertion pipe 3 is further finely granulated, and the finely granulated mud S inside the insertion pipe 3 is mixed with the liquid inside the insertion pipe 3 (the water W in the water area and the liquid supply mechanism 8).
- the inside of the insertion tube 3 is filled with slurry-like mud S.
- the liquid L is supplied to the inside of the insertion pipe 3 inserted into the waterbed ground B, and the stirring blade 6 is rotated to excavate the mud S of the waterbed ground B inside the insertion pipe 3.
- the stirring blade 6 is rotated to excavate the mud S of the waterbed ground B inside the insertion pipe 3.
- the axial deflection of the rotary shaft 4 by the axial deflection suppressing means 9 disposed inside the insertion tube 3, it is advantageous for stably pulverizing the mud S and lifting it up. Therefore, the bottom water resources contained in the mud S can be collected efficiently.
- the shaft deflection of the rotating shaft 4 by the shaft deflection suppressing means 9 it is possible to more reliably prevent the stirring impeller 6 from coming into contact with the insertion tube 3 and being damaged.
- the inner diameter of the lifting tube 2 used in the deep sea is small, and the gap between the inner peripheral surface of the lifting tube 2 and the rotating shaft 4 is relatively narrow. Since the tube 2 and the insertion tube 3 are maintained at the center of the tube axis, the mud S is less likely to clog the storage tube 2 . Therefore, troubles are unlikely to occur in the lifting pipe 2, and the mud S of the water bottom ground B can be lifted up and collected very smoothly. Further, since the liquid L is supplied to the inside of the insertion tube 3 to excavate and disintegrate the mud S inside the insertion tube 3, the liquid L does not flow outside the insertion tube 3 even when a liquid other than water is supplied as the liquid L. It is difficult to flow out into the water.
- the shaft blur suppression means 9 inside the insertion tube 3, the amount of movement of the rotation shaft 4 in the direction perpendicular to the tube axis direction can be reduced. This makes it possible to set the size of the gap (clearance) between the inner peripheral surface of the insertion tube 3 and the tip of the stirring blade 6 to be relatively small. Since it is possible to extend the stirring blades 6 to a position closer to the inner peripheral surface of the insertion pipe 3 than in the case where the shaft blurring suppression means 9 is not provided, the mud S inside the insertion pipe 3 is moved by the stirring blades 6. It becomes possible to excavate and desludge more efficiently.
- the sampling system 1 having the configuration including the shaft blurring suppression means 9 is not limited to the configuration in which the slurry-like mud S is raised to the upper part of the insertion pipe 3 by the stirring flow generated by the rotation of the stirring blade 6.
- the contact portion 10 is configured to include an elastic member extending from the tip portion of the stirring blade 6 to the inner peripheral surface of the insertion tube 3, the configuration is very simple, and the inner peripheral surface of the insertion tube 3 is not affected. Shaking of the rotating shaft 4 can be effectively suppressed by the biasing force of the elastic member in contact.
- the elastic members so as to be point-symmetrical about the axis of the rotating shaft 4 in a plan view, it is possible to more effectively suppress the vibration of the rotating shaft 4 .
- an elastic member between the tip of the stirring blade 6 and the inner peripheral surface of the insertion tube 3 it is possible to more reliably prevent the stirring blade 6 from coming into contact with the insertion tube 3 and being damaged. .
- the mud S between the tip of the stirring blade 6 and the inner peripheral surface of the insertion tube 3, which the stirring blade 6 cannot reach can be excavated and demulsified by the elastic member, the mud S inside the insertion tube 3 can be exhaustively removed. Useful for picking up. Further, the contact portion 10 also functions as a scraper, and the amount of mud S remaining adhering to the inner peripheral surface of the insertion pipe 3 after the mud S inside the insertion pipe 3 has been lifted up is reduced. When the mud S is lifted up and collected several times by changing the insertion position of the insertion pipe 3, the insertion pipe 3 does not increase in resistance when inserting the insertion pipe 3 in a new position of the water bottom ground B, and the insertion pipe 3 can be smoothly moved. can be inserted into It is also possible to reduce the labor required for maintenance of the insertion tube 3 after finishing the pick-up work.
- the mud S between the tip of the stirring blade 6 and the inner peripheral surface of the insertion tube 3 is injected from the elastic member and the injection nozzle 8a.
- the liquid L excavation and desludging can be performed more efficiently. Therefore, it is more advantageous to exhaustively lift up the mud S inside the insertion tube 3 .
- the elastic member is configured to be inclined in the same direction as the attached stirring blade 6, the elastic member can easily rotate together with the stirring blade 6 in the mud S, and the mud S can be smoothly excavated and thawed. becomes advantageous.
- the elastic member substantially the same effect as that obtained by inclining the stirring blade 6 in the direction of rotation can be obtained.
- the axial vibration suppression means 9 can be configured by, for example, a shaft vibration suppression unit 11.
- FIG. Other configurations of the collection system 1 are the same as the previously illustrated embodiments. 15, the head 5, the stirring blade 6 and the injection nozzle 8a are omitted.
- the shaft vibration suppression unit 11 includes an arm group composed of a bearing portion 12 externally fitted to the rotating shaft 4, a plurality of arms 13 connected to the bearing portion 12, and an arm group provided at the tip of each arm 13. and a contact portion 10 .
- the bearing portion 12 is rotatably supported by the rotating shaft 4 .
- a plurality of arms 13 radially extend from the bearing portion 12 toward the inner peripheral surface of the insertion tube 3 around the rotation shaft 4 in plan view.
- the arm group has four arms 13, but the number of arms 13 is not particularly limited as long as it is two or more. , a configuration having five or more arms 13 is also possible.
- the contact portion 10 of this embodiment is composed of a roller 15 that contacts the inner peripheral surface of the insertion tube 3 and rotates in the tube axial direction.
- the contact portion 10 may also include, for example, a sliding member that can slide in the axial direction while in contact with the inner peripheral surface of the insertion tube 3, or a fixed member that is fixed to the inner peripheral surface of the insertion tube 3. You can also
- the shaft vibration suppression unit 11 of this embodiment is arranged directly above the stirring blades 6 .
- the shaft vibration suppression unit 11 moves in the pipe axial direction inside the insertion tube 3 following the stirring blade 6 (head 5), thereby separating the shaft vibration suppression unit 11 and the stirring blade 6 in the pipe axial direction. It is designed to maintain a constant distance. That is, the shaft vibration suppressing unit 11 (bearing portion 12 ) is configured to move in the tube axial direction together with the rotating shaft 4 while being fitted onto the rotating shaft 4 .
- the method of collecting bottom-of-water resources using this collection system 1 is generally the same as in the previously exemplified embodiment.
- the insertion pipe 3 housing the head 5 and the shaft vibration suppression unit 11 is The upper part is not inserted into the waterbed ground B, and the head 5 and the shaft vibration suppression unit 11 are arranged above the surface of the waterbed ground B.
- the rotating shaft 4 is lowered from the surface of the water (the hoisting and recovering ship 20) toward the seabed B while being inserted into the inside of the hoisting and recovering pipe 2 and the insertion pipe 3, and the rotating shaft 4 is moved to the shaft vibration suppression unit 11. , and the head 5 (stirring blade 6 ) is connected to the lower end of the rotating shaft 4 .
- the head 5 is connected to the lower end of the rotating shaft 4
- the head 5 and the shaft vibration suppression unit 11 are removed from the insertion tube 3 .
- the head 5 (stirring impeller 6) integrated with the rotary shaft 4 and the shaft blurring suppression unit 11 become movable in the tube axial direction.
- the subsequent work procedure is the same as in the previously illustrated embodiment.
- the contact portion 10 abuts against the inner peripheral surface of the insertion tube 3, thereby adjusting the axial center position of the rotating shaft 4. is regulated, and the rotating shaft 4 is maintained at the center of the pipe axis. Therefore, it is possible to effectively suppress shaft shake during rotation of the rotating shaft 4 . Furthermore, since the bearing portion 12 is rotatably supported by the rotating shaft 4, the rotation of the shaft vibration suppression unit 11 can be suppressed even when the rotating shaft 4 is rotating at high speed. Therefore, it is possible to avoid applying a large load to the arm 13 and the contact portion 10 .
- the shaft vibration suppression unit 11 is arranged above the lowest stirring blade 6, more preferably above the highest stirring blade 6.
- the resistance applied to the shaft vibration suppression unit 11 during excavation of the mud S can be reduced, and the water bottom ground B can be excavated more easily.
- the shaft vibration suppression unit 11 is arranged above the stirring blade 6 and moves in the pipe axial direction together with the stirring blade 6, the shaft vibration suppression unit 11 is always in contact with the stirring blade 6.
- the rotation shaft 4 is suppressed from shaking. Therefore, it becomes difficult for the stirring blades 6 to move in the direction orthogonal to the pipe axis direction, and it is possible to more reliably prevent the stirring blades 6 from coming into contact with the insertion pipe 3 and being damaged.
- the contact portion 10 provided at the tip of the arm 13 is configured by a roller 15 that contacts the inner peripheral surface of the insertion tube 3 and rotates in the direction of the tube axis, axial vibration can be suppressed together with the rotating shaft 4.
- This facilitates smooth movement of the unit 11 in the tube axial direction with respect to the insertion tube 3 .
- the contact portion 10 is composed of a sliding member with low friction with the inner peripheral surface of the insertion tube 3, and the sliding member contacts the inner peripheral surface of the insertion tube 3 and slides in the tube axial direction. can produce substantially the same effect.
- the shaft blurring suppression means 9 is limited to the elastic member and the shaft blurring suppression unit 11 illustrated above as long as it is disposed inside the insertion tube 3 and suppresses shaft blurring when the rotating shaft 4 rotates. not, and many other configurations are possible.
- the axial vibration suppression unit 11 can be configured to move in the axial direction inside the insertion tube 3 independently of the stirring blades 6 .
- the shaft vibration suppression unit 11 (contact portion 10) is fixed at a predetermined position inside the insertion tube 3, and the rotating shaft 4 is arranged in the tube axial direction with respect to the shaft vibration suppression unit 11 (bearing portion 12). can also be configured to be relatively movable.
- a configuration in which the elastic member and the shaft vibration suppression unit 11 are combined as the shaft vibration suppression means 9 may be employed.
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Abstract
Description
2 揚収管
3 挿入管
3a ストッパー
3b 下端
4 回転軸
5 ヘッド
6 撹拌翼
7 掘削刃
8 液体供給機構
8a 噴射ノズル
8b 配管
9 軸ブレ抑制手段
10 当接部
11 軸ブレ抑制ユニット
12 軸受部
13 アーム
20 揚収船
B 水底地盤
S 泥土
L 液体
W 水
Claims (11)
- 水底資源が含有されている水底地盤の泥土を掘削して水上に揚収する水底資源の採取システムにおいて、
水上から前記水底地盤に向かって延在する揚収管と、前記揚収管の下部に接続された挿入管と、前記揚収管および前記挿入管の内部を管軸方向に延在している回転軸と、前記回転軸の下部に取付けられていて前記挿入管の内部に配置されている撹拌翼と、前記挿入管の内部に液体を供給する液体供給機構とを備え、
前記挿入管の少なくとも下部が前記水底地盤に挿入された状態で、前記液体供給機構により前記挿入管の内部に前記液体が供給されるとともに、前記回転軸の回転に伴って回転する前記撹拌翼により、前記挿入管の内部の前記泥土が掘削されて解泥され、その解泥によりスラリー状になった前記泥土が、前記撹拌翼の回転によって発生する撹拌流によって前記挿入管の上部に上昇し、その上昇したスラリー状の前記泥土が揚送手段により前記揚収管を通じて水上に揚収される構成にしたことを特徴とする水底資源の採取システム。 - 水底資源が含有されている水底地盤の泥土を掘削して水上に揚収する水底資源の採取システムにおいて、
水上から前記水底地盤に向かって延在する揚収管と、前記揚収管の下部に接続されている挿入管と、前記揚収管および前記挿入管の内部を管軸方向に延在している回転軸と、前記回転軸の下部に取付けられていて前記挿入管の内部に配置されている撹拌翼と、前記挿入管の内部に液体を供給する液体供給機構と、前記挿入管の内部に配置されていて前記回転軸の回転時の軸ブレを抑制する軸ブレ抑制手段とを備え、
前記挿入管の少なくとも下部が前記水底地盤に挿入された状態で、前記液体供給機構により前記挿入管の内部に前記液体が供給されるとともに、回転する前記回転軸の軸ブレが前記軸ブレ抑制手段によって抑制された状態で、前記回転軸の回転に伴って回転する前記撹拌翼により、前記挿入管の内部の前記泥土が掘削されて解泥され、その解泥によりスラリー状になった前記泥土が前記挿入管の上部に上昇し、その上昇したスラリー状の前記泥土が揚送手段により前記揚収管を通じて水上に揚収される構成にしたことを特徴とする水底資源の採取システム。 - 前記軸ブレ抑制手段が、前記挿入管の内周面に当接する当接部を有している請求項2に記載の水底資源の採取システム。
- 前記当接部として、前記撹拌翼の先端部から前記挿入管の内周面まで延在する弾性部材を備えている請求項3に記載の水底資源の採取システム。
- 前記軸ブレ抑制手段として、前記回転軸に回転可能に軸支される軸受部と、平面視で前記軸受部から前記挿入管の内周面に向かって放射状に延在している複数のアームを有するアーム群と、それぞれの前記アームの先端部に設けられた前記当接部とを有する軸ブレ抑制ユニットを備えている請求項3または4に記載の水底資源の採取システム。
- 前記撹拌翼の上方位置に前記軸ブレ抑制ユニットが配置されていて、前記軸ブレ抑制ユニットが前記撹拌翼とともに前記挿入管に対して管軸方向に移動する構成である請求項5に記載の水底資源の採取システム。
- 少なくとも1つの前記撹拌翼の先端部に前記液体供給機構が設けられていて、この液体供給機構が前記挿入管の内周面に向かって前記液体を噴射する噴射ノズルを有している請求項1~6のいずれかに記載の水底資源の採取システム。
- 水底資源が含有されている水底地盤の泥土を掘削して水上に揚収する水底資源の採取方法において、
水上から前記水底地盤へ向けて揚収管を延設し、前記揚収管の下部に接続している挿入管の少なくとも下部を前記水底地盤に挿入した状態で、前記挿入管の内部に液体を供給するとともに、前記揚収管および前記挿入管の内部を管軸方向に延在している回転軸を回転させて、前記回転軸の下部に取付けられている撹拌翼を前記挿入管の内部で回転させることにより、前記挿入管の内部の前記泥土を掘削して解泥し、その解泥によってスラリー状にした前記泥土を前記撹拌翼の回転によって発生させた撹拌流によって前記挿入管の上部へ上昇させ、その上昇させたスラリー状の前記泥土を揚収手段により前記揚収管を通じて水上に揚収することを特徴とする水底資源の採取方法。 - 水底資源が含有されている水底地盤の泥土を掘削して水上に揚収する水底資源の採取方法において、
水上から前記水底地盤へ向けて揚収管を延設し、前記揚収管の下部に接続している挿入管の少なくとも下部を前記水底地盤に挿入した状態で、前記挿入管の内部に液体を供給するとともに、前記揚収管および前記挿入管の内部を管軸方向に延在している回転軸を回転させつつ、前記挿入管の内部に配置した軸ブレ抑制手段により前記回転軸の軸ブレを抑制した状態で、前記回転軸の下部に取付けられている撹拌翼を前記挿入管の内部で回転させることにより、前記挿入管の内部の前記泥土を掘削して解泥し、その解泥によってスラリー状にした前記泥土を前記挿入管の上部へ上昇させ、その上昇させたスラリー状の前記泥土を揚収手段により前記揚収管を通じて水上に揚収することを特徴とする水底資源の採取方法。 - 前記撹拌翼を前記水底地盤の新たな表面から所定深度まで貫入して前記挿入管の内部の前記泥土を掘削した後に、前記挿入管の内部で前記撹拌翼を管軸方向に複数回往復移動させて前記泥土を繰り返し解泥する請求項8または9に記載の水底資源の採取方法。
- 前記撹拌翼を前記水底地盤の新たな表面から所定深度まで貫入する掘削時の前記撹拌翼の管軸方向の移動速度よりも、前記挿入管の内部で前記撹拌翼を管軸方向に複数回往復移動させる時の前記撹拌翼の管軸方向の移動速度を速くする請求項10に記載の水底資源の採取方法。
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US20240141769A1 (en) | 2024-05-02 |
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