JP6004335B2 - Method and apparatus for separating dredged soil - Google Patents

Description

  The present invention relates to a dredging method and dredging method for separating dredged sand mixed with foreign matters such as wood pieces into earth and sand components and dredging when dredging sediment deposited on the bottom of water such as a harbor using a grab dredger. Relates to the device.

  As a dredging device for dredging the bottom of a port or the like, a grab dredger that has a grab bucket that can be opened and closed with a crane unit that can be opened and closed is supported and widely supported by a crane device. Yes.

  When dredging equipment with this grab bucket is used to dredge soil that contains a large amount of foreign matter such as wood chips deposited on the bottom of the water, dredged soil that contains foreign matter (hereinafter referred to as foreign matter mixed sediment) It is desirable to separate the components and foreign materials such as wood pieces and recycle the earth and sand components and wood pieces respectively.

  Conventionally, as a method for separating such foreign substance mixed earth and sand into earth and sand components and foreign substances, a sieve such as a vibration sieve is provided at the earth and sand inlet of the earth and sand carrier ship and the pumping device, and the foreign substance grasped by the grab bucket. A method is widely used in which only the earth and sand components are sifted down under the sieve by collecting the mixed earth and sand, and the foreign matters remaining on the sieve are separately collected (see, for example, Patent Document 1).

  In addition, as another method of separating foreign matter mixed earth and sand into earth and sand components and foreign substances, a method of separating using a specific gravity difference between sand and foreign substances contained in dredged sand (for example, see Patent Document 2), A separation method using a filtration device (see, for example, Patent Document 3) is also widely known.

Japanese Patent Laid-Open No. 06-055198 Japanese Patent Laid-Open No. 11-137910 JP 2002-254063 A

  However, in the separation method using the conventional sieve such as the vibration sieve as described above, there is a problem that the earth and sand components and the foreign matters are not sufficiently separated, and many earth and sand components remain on the sieve together with the foreign matters. For this reason, in addition to the separation work by the sieve, there is a case where a separate work by human power or the like is required, and the work time and work cost are increased, and there is a possibility that the separation efficiency of the foreign matter is lowered.

  In addition, when a sieve such as a vibration sieve is used, clogging of the sieve due to earth and sand components is likely to occur, and the washing operation of the sieve must be performed to eliminate the clogging. There was a problem that the cost increased.

  On the other hand, in the conventional separation method using the specific gravity difference or the separation method using the filtration device, the dredging work by the grab dredger etc. and the separation work of the foreign substance mixed earth and sand are performed separately, so the equipment becomes large At the same time, the work took a lot of time.

  In addition, in the separation method using the specific gravity difference and the separation method using the filtration device, the sediment component and the foreign matter are not sufficiently separated, similarly to the separation method using a sieve such as a vibration sieve, and separately by human power etc. In some cases, separation work is required, and the work time and work cost are increased, and the separation efficiency of foreign matters may be reduced.

  Furthermore, the collected foreign matter mixed earth and sand pieces or the wood pieces with the earth and sand components attached thereto are treated as industrial waste in the land area and are subject to regulations based on various related laws and regulations when transported, processed and reused. Therefore, it is desirable that the earth and sand components and the foreign matters such as wood pieces are separated at the stage of dredging work and recovered in a state where they can be easily reused (recycled).

  In view of such a conventional problem, the present invention provides a dredging method and dredging device for dredged sand that can be easily and inexpensively constructed, and that can efficiently separate foreign matter mixed earth and sand into foreign substances such as earth and sand components and wood chips. It was made for the purpose of provision.

  The feature of the invention described in claim 1 for solving the conventional problem as described above includes a grab bucket having an openable and closable earth and sand containing portion composed of a plurality of shells, and an operation means for operating the grab bucket. In the method for separating dredged soil, the dredged foreign material mixed sand is dredged using a dredging device, and the dredged foreign material mixed sand is separated into a sediment component and foreign matter. Using a grab bucket provided with a lattice-shaped transmission part, after grabbing the foreign substance mixed soil at the bottom of the water in the earth and sand container, using the jet nozzle in a state where the earth and sand container is closed, Injecting high-pressure water into the sediment containing water, generating a water flow while supplying water into the sediment containing portion, separating the foreign material mixed sediment into the foreign material and sediment components using the water flow, and In this case, the mixed water is allowed to flow in a state where the earth and sand component is floating, and the earth and sand component is discharged to the outside of the earth and sand container, and then, foreign matters remaining in the earth and sand container are collected.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the jet nozzle is installed outside the earth and sand container, and the high-pressure water is injected into the earth and sand container through the permeation part.

  According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the grab bucket that has grabbed the foreign substance mixed earth and sand is moved into an earth and sand collecting tank installed on a trolley or on the ground, and the earth and sand are moved. In the collection tank, high pressure water is jetted into the earth and sand container by using the jet nozzle, and water mixed in a state where the earth and sand components are floating is allowed to overflow into the earth and sand collection tank.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the water stored in the sediment recovery tank is supplied to the jet nozzle, and the stored water is supplied between the sediment recovery tank and the jet nozzle. It is to circulate between them.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the earth and sand container includes a sealing door that opens and closes the permeation portion, and the bottom portion of the water bottom portion is closed when the permeation portion is closed. The foreign object mixed earth and sand is grabbed, and then the high-pressure water is injected into the earth and sand container by opening the transmission part.

  According to a sixth aspect of the present invention, there is provided a grab bucket having an openable and closable earth and sand containing portion composed of a plurality of shells, and an operating means for operating the grab bucket. In the dredge apparatus configured to grab the mixed earth and sand, the upper surface of the earth and sand container includes a net-like or lattice-shaped transmission part, and includes a jet nozzle that injects high-pressure water into the earth and sand container, and the high-pressure water The water is generated in the earth and sand container by supplying water, and the water is used to separate the foreign substance mixed earth and sand into the foreign substance and the earth and sand component. It is that the water contained in a floating state is allowed to overflow and the sediment component is discharged out of the sediment storage unit.

  According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the jet nozzle is installed outside the earth and sand container, and the high-pressure water is injected into the earth and sand container through the transmission part. It is in.

  A feature of the invention described in claim 8 is that, in addition to the configuration of claim 6 or 7, the transmitting portion is provided by being shifted to one end portion of the upper surface portion of the earth and sand accommodating portion.

  According to a ninth aspect of the present invention, in addition to the configuration of the sixth or seventh aspect, a pair of the transmissive portions are provided symmetrically at both ends of the upper surface portion of the earth and sand accommodating portion.

  A feature of the invention described in claim 10 is that, in addition to the configuration of claims 6 to 8 or 9, a sealing door for opening and closing the transmitting portion is provided in the earth and sand accommodating portion.

  According to an eleventh aspect of the invention, in addition to the configuration of the sixth to ninth or tenth aspects, an air supply means for supplying air to the jet nozzle is provided so that bubbles can be mixed into the high-pressure water. It is in.

  As described above, the method for separating dredged sand according to the present invention uses a grab bucket having an openable and closable earth and sand containing portion composed of a plurality of shells, and a dredging device comprising operating means for operating the grab bucket. In the method for separating dredged sand, which separates the dredged foreign substance mixed sediment into a sediment component and foreign substances, a net-like or grid-like transmission part is provided on the upper surface of the sediment containing part. After grabbing the foreign substance mixed soil at the bottom of the water using the grab bucket provided, the high pressure water is jetted into the sediment containing part using a jet nozzle in a state where the sediment containing part is closed. And generating water flow while supplying water into the earth and sand container, and separating the foreign substance mixed earth and sand into the foreign substances and earth and sand components by using the water flow, and through the permeation part, the earth and sand Efficient use of foreign material-mixed sediment by overflowing mixed water in a floating state and releasing the sediment component out of the sediment storage unit, and then collecting the foreign material remaining in the sediment storage unit It can often be separated into earth and sand components and foreign substances, and the work period can be shortened by carrying out the separation work in a series of dredging work, and the work cost can be reduced. Furthermore, because of the high separation effect, foreign materials such as wood chips and sediment components can be collected in a reusable state, reducing the impact of regulations based on relevant laws and regulations, and recycling the collected materials as resources (recycling). ) Becomes easier.

  In the present invention, the jet nozzle can be installed outside the earth and sand containing part, and the high pressure water can be jetted into the earth and sand containing part through the permeating part, whereby the jet nozzle can be suitably installed, and the high pressure water is It collides with the water surface in the accommodating part, and air can be mixed with the high-pressure water by the impact, and bubbles can be mixed into the water flow.

  Further, in the present invention, the grab bucket that has grabbed the foreign substance mixed earth and sand is moved into the earth and sand collecting tank installed on the trolley or on the ground, and the high pressure is applied to the earth and sand container using the jet nozzle in the earth and sand collecting tank. By spraying water and allowing the mixed water in a state where the sediment component floats to overflow into the sediment collection tank, the separated sediment component can be suitably recovered, and the separated sediment component can be efficiently recycled. Can be used. Moreover, scattering of earth and sand components to the surrounding water area can be prevented, and contamination of the water area can be prevented.

  Furthermore, in the present invention, the water stored in the sediment collection tank is supplied to the jet nozzle, and the stored water is circulated between the sediment collection tank and the jet nozzle, so that When the stored water increases due to the overflow, the stored water can be suitably discharged to keep the water level in the earth and sand collection tank constant, and the water of the high-pressure water jet can be easily secured.

  Further, in the present invention, the earth and sand container is provided with a sealing door that opens and closes the permeation part, the foreign matter mixed earth and sand at the bottom of the water is grasped with the permeation part closed, and then the permeation part is opened to By injecting high-pressure water into the earth and sand container, it is possible to select and use a state in which the earth and sand container is sealed and a state in which it is opened through the permeation part for each operation.

Moreover, the dredging device according to the present invention includes a grab bucket having an openable and closable earth and sand containing portion composed of a plurality of shells, and operating means for operating the grab bucket, and foreign matter mixed in the bottom of the water by the grab bucket. In the dredging apparatus configured to grab the earth and sand, the upper surface of the earth and sand container includes a mesh-like or lattice-shaped transmission part, a jet nozzle that jets high-pressure water into the earth and sand container, and the high-pressure water By spraying, water is generated while supplying water into the earth and sand container, and the foreign material mixed earth and sand is separated into the foreign substances and earth and sand components using the water flow, and the earth and sand components are floated through the permeation part. The mixture of foreign matter is included in a series of dredging operations by allowing the mixed water to overflow and discharging the sediment component out of the sediment storage part. Sand can be separated into a foreign matter such as sand components and wood.
Further, in the present invention, the transmitting portion is provided by being shifted to one end portion of the upper surface portion of the earth and sand accommodating portion, or a pair of the transmitting portions are arranged symmetrically at both ends of the upper surface portion of the earth and sand accommodating portion. By providing, the earth and sand component and the foreign substance can be suitably floated in the earth and sand container, and the water in which the earth and sand component is mixed can be suitably overflowed outside the earth and sand container.

  Furthermore, in the present invention, by providing the earth and sand container with a sealing door that opens and closes the transmission part, it is possible to select a state in which the earth and sand container is sealed and a state in which the earth and sand container is opened through the transmission part for each situation during work. It is like that.

  Further, in the present invention, by providing an air supply means for supplying air to the jet nozzle so that bubbles can be mixed into the high-pressure water, bubbles can be mixed into the jet water stream, and the bubbles can be separated. Separation of foreign substances and sediment components can be promoted by the effect.

It is a side view which shows the outline of an example of the dredging apparatus used for the separation method of dredged soil according to the present invention. It is a front view which shows an example of the grab bucket in FIG. (A) (b) is a side view of the grab bucket same as above, (a) is the state which closed the permeation | transmission part, (b) is a figure which shows the state which opened the permeation | transmission part. It is a figure for demonstrating the state of the isolation | separation operation | work in this invention method, Comprising: It is a partially broken front view which made only the earth and sand accommodating part part the cross section. It is a figure which shows the other embodiment of the isolation | separation operation | work in this invention method, Comprising: It is a partially broken front view which made only the earth and sand accommodating part part the cross section.

  Next, embodiments of the dredged sand separation method and dredging apparatus according to the present invention will be described based on the examples shown in FIGS. In the figure, symbol A is a water bottom, symbol B is a water surface, and symbol 1 is a dredging device used in the method of the present invention.

  This dredging device 1 includes a grab bucket 2 for grabbing the soil and sand in the bottom A, and an operating means 3 for operating the grab bucket 2, and a transmission part 15 on the upper surface of the soil and sand container 12 of the grab bucket 2. It doubles as a separator.

  The operation means 3 is constituted by a crane device installed in the grab dredger 4, and the lifting wire 6 and the operation wire 7 are suspended from the tip of the jib 5 of the crane device 3 so as to be drawn out and wound up.

  Moreover, the crane apparatus which comprises this operation | movement means 3 can control the up-down direction position of the grab bucket 2 by controlling the feeding amount and winding amount of the raising / lowering wire 6, and the raising / lowering wire 6 can be controlled. The vertical movement speed of the grab bucket 2 can be controlled by controlling the feeding speed and the winding speed.

  As shown in FIGS. 2 and 3, the grab bucket 2 is moved up and down relative to the upper frame 8 connected to the lower end of the lifting wire 6 fed from the tip of the jib 5 of the crane device 3 and the upper frame 8. The lower frame 9 arranged in a possible manner, the earth and sand accommodating portion 12 composed of a pair of shells 10 and 11 pivotally supported by the lower frame, and the arm 13 that rotatably connects the shells 10 and 11 and the upper frame 8. , 13 and is moved up and down by the drawing / winding operation of the lifting / lowering wire 6, and the lower frame 9 is relative to the upper frame 8 by the feeding / winding operation of the operating wire 7 fed from the tip of the jib 5. By moving, the earth and sand container 12 comprising the pair of shells 10 and 11 is opened and closed.

  The structure of the grab bucket 2 is not limited to the structure as described above, but may be a so-called double cable type, a single cable type, a hydraulic type, or the like. It may be configured by.

  Each of the shells 10 and 11 is formed in a seashell shape with its upper end pivoted, and a hollow container-shaped earth and sand containing portion 12 is formed that is closed by closing the openings when closed. .

  In addition, a water-stopping member such as packing (not shown) is provided at the opening edge of each shell 10, 11, and when the earth and sand container 12 is closed, the water inside leaks out of the earth and sand container 12. There is no such thing.

  One shell 10 is provided with a mesh-like or lattice-like transmission part 15 on the upper plate part 10a constituting the outer shell, and the transmission part 15 that allows the earth and sand component to permeate through one side of the upper surface part of the earth and sand container 12. Is to be provided.

  The transmission part 15 is constituted by a transmission port 15a formed in the upper plate part 10a of the shell 10 and a net-like or lattice-like transmission member 15b incorporated in the transmission port 15a, and the earth and sand components through the mesh of the transmission member 15b. Is transparent.

  The transmission member 15b has a mesh size set based on dredging conditions, how to separate earth and sand, use of reclaimed earth, etc. For example, when sand and gravel are separated and reused, the mesh is fine. If the purpose is to allow only sediment components with a small particle size to permeate and only to separate the sediment component from foreign objects such as relatively large pieces of wood, set the coarse mesh to create a sediment component with a large particle size. Can also be transmitted.

  Further, one shell 10 is provided with a sealing door 16 that opens and closes the transmission portion 15, and the earth and sand container 12 can be sealed by closing the transmission portion 15 with the sealing door 16.

  The sealing door 16 is formed in a flat plate shape that fits into the transmission port 15a, and its upper edge is rotatably supported by the shell 11 via hinges 17 and 17, and is opened and closed by an opening / closing means made of a wire (not shown). It has come to be. In addition, the aspect of the sealing door 16 is not limited to the rotation type (folding door type) shown in the drawing, and may be a sliding door type or a shutter type structure.

  Further, the grab bucket 2 is provided with a plurality of jet nozzles 18, 18... Outside the earth and sand container 12, outside the transmission part 15, with an injection port directed toward the transmission part 15. High-pressure water (hereinafter referred to as high-pressure water JW) can be jetted from the jet nozzles 18, 18...

  The jet nozzles 18, 18... Are supplied with highly compressed water through a water supply hose 20 from a high pressure water supply means 19 comprising a water supply pump installed in the grab dredger 4 or the like.

  The jet nozzles 18, 18... May be supplied with air from an air supply means (not shown) so that bubbles can be mixed into the high-pressure water JW.

  Each of the jet nozzles 18, 18... Is fixed to the outside of the arm 13 through a mounting member 21 at a desired angle, for example, and the desired angle is set in the earth and sand container 12 through the transmission part 15 when the earth and sand container 12 is closed. The high-pressure water JW can be jetted with.

  The installation positions and angles of the jet nozzles 18, 18... Are set based on various conditions such as the shape of the earth and sand container 12 and the soil quality of dredged soil, and the jet nozzles 18, 18. A water flow is generated while supplying water into the earth and sand container 12 by high-pressure water JW injection.

  Next, a method for separating dredged soil according to the present invention using such dredger device 1 will be described.

  First, the grab dredger 4 is moved to the dredging target water area, and the grab bucket 2 is lowered by the operating means 3 as shown by a one-dot chain line in FIG. The bottom is made to penetrate into the bottom sediment, and from this state, the earth and sand container 12 is closed by the operation means 3, and the foreign substance mixed earth and sand 30 is grasped in the earth and sand container 14 of the earth and sand container 12. At this time, the transmission part 15 is closed by the sealing door 16, and the earth and sand accommodating part 12 is sealed.

  Next, the grab bucket 2 in which the foreign substance mixed earth and sand 30 is accommodated in the earth and sand accommodating part 12 is once pulled up to the surface of the water by the operating means 3, and then the grab bucket 2 is placed on the earth and sand carrier 31 as shown in FIG. It moves in the earth and sand collection tank 32 installed.

  At that time, the grab bucket 2 is arranged so that the position of the transmission portion 15 is higher than the surface of the stored water 33 in the sediment collection tank 32, so that the sediment storage unit 12 is not submerged in the stored water 33. Is prevented from flowing back into the earth and sand container 12.

  The earth and sand recovery tank 32 is provided with a drainage means for draining the internal stored water 33 so that the water level of the stored water 33 can be kept constant.

  As a drainage means, for example, as shown in FIG. 4, a pump 34 is installed in the sediment collection tank 32, the stored water 33 is sucked by the pump 34, and is discharged out of the sediment collection tank 32 through the drainage hose 35.

  Further, the drainage means connects the drainage hose 35 to the high-pressure water supply means 19, supplies the stored water 33 in the sediment collection tank 32 to the jet nozzles 18, 18. And the jet nozzles 18, 18...

  Next, after moving the grab bucket 2 into the earth and sand collection tank 32, the sealing door 16 is operated in that state to open the permeation part 15, and the high-pressure water JW from the jet nozzles 18, 18. Is injected into the earth and sand container 12 to start the separation work of the foreign substance mixed earth and sand 30.

  In this way, by jetting the high pressure water JW from the jet nozzles 18, 18... Installed outside the earth and sand container 12, a water flow is generated while supplying water into the earth and sand container 12.

  Then, the sediment component 37 is drawn from the foreign matter 36 by the water flow of the water flow, and the water in the sediment containing portion 12 is stirred, and the stirring promotes the separation of the sediment component 37 and the foreign matter 36. The separated earth and sand component 37 and the foreign matter 36 are conveyed to the water flow and float in the water in the earth and sand container 12.

  Also, in this water flow, the surrounding air is taken in by the impact when the high-pressure water JW is struck against the water surface, and bubbles 38, 38 ... are mixed, and these bubbles 38, 38 ... are carried into the water flow. The separation of the foreign matter 36 and the sediment component 37 is promoted by the separation effect of the bubbles 38, 38.

  Then, the water level in the sediment collection tank 32 is kept constant by the drainage means, and the water is sequentially fed into the sediment storage unit 12 by high-pressure water JW injection from the jet nozzles 18, 18. The water level exceeds the lower edge position of the permeation part 15, and the mixed water overflows through the permeation part 15 in a state where the earth and sand component 37 floats.

  Thus, when the water in which the sediment component 37 is mixed flows out of the sediment storage unit 12, the sediment component 37 carried to the overflow F is passed through the permeation unit 15, outside the sediment storage unit 12, that is, sediment recovery. The earth and sand component 37 having a large specific gravity discharged into the tank 32 settles in the stored water 33 and accumulates at the bottom of the earth and sand collection tank 32.

  On the other hand, the foreign matter 36 such as a piece of wood separated from the earth and sand component 37 circulates in the earth and sand container 12 while being carried by the water stream and floats, and when the water in the earth and sand container 12 overflows through the transmission part 15. Then, it is blocked by the permeation part 15 and remains in the earth and sand container 12, and is carried again to the water stream and circulates in the earth and sand container 12.

  Further, the foreign matter 36 circulates while repeatedly colliding with the inner walls of the shells 10 and 11 and the transmission part 15, and the separation of the earth and sand component 37 adhering to the foreign matter 36 is also promoted by the impact caused by the collision.

  In this series of separation operations, as shown in FIG. 4, the peripheral wall of the earth and sand collection tank 32 is formed high so as to surround the entire grab bucket 2. Thereby, scattering of the high-pressure water JW containing the earth and sand components to the outside of the earth and sand collection tank 32 is prevented, and contamination of the surrounding water area can be prevented and the earth and sand components can be efficiently collected.

  The separation operation using the jet water flow is repeated for a desired time, and when the separation of the sediment component 37 and the foreign material 36 is completed, the grab bucket 2 is lifted from the sediment collection tank 32 by the operating means, and on the transport ship for the foreign material 36. Therefore, the earth and sand container 12 is released, and the foreign material 36 such as a piece of wood is reloaded on the foreign material transport ship to collect the foreign material 36.

  In addition, in the case where a component having a relatively large particle size such as gravel and stone pieces remains together with the foreign matter 36 in the earth and sand container 12, a sieve such as a coarse vibrating sieve is installed on the transport ship, By releasing the grab bucket 2 on the sieve, foreign matter 36 such as wood chips and gravel can be separated. At that time, since the foreign matter 36 and gravel are separated from each other in the grab bucket 2 by the above-described separation promotion operation, the separation can be suitably performed with a sieve.

  Then, the above-described series of operations are performed while moving the grab dredger 4, and the bottom A of the dredging target water area is dredged in sequence, and each time the dredging is mixed, the foreign substance mixed earth and sand 30 is changed into the earth and sand component 37 and the foreign substance 36 such as a wood piece. The separated earth and sand component 37 and the foreign matter 36 are separately collected.

  In the dredged sand separation method configured in this way, the work of separating the foreign-material-mixed sand 30 into the sand-and-sand component 37 such as sand and the foreign-material 36 such as wood chips can be performed in a series of dredging work. In addition, the construction period can be shortened, the work cost can be reduced, and the equipment cost can be suppressed because it is not necessary to provide a separate apparatus for separation.

  Further, in this dredged sand separation method, in addition to the separation effect by the jet water flow, the separation effect by the bubbles 38, 38. Therefore, even if it is simple and inexpensive, the separation work can be performed efficiently.

Furthermore, in the method of the present invention, the separation work is performed in a series of dredging work, and the foreign matter 21 such as a piece of wood and the earth and sand component 22 can be recovered in a reusable separated state by a high separation effect. The influence of the regulations based on related laws and regulations is reduced, and it becomes easy to reuse (recycle) the recovered material, that is, the earth and sand component 22 and the wood chips 21 as resources.

  In the above-described embodiment, the example in which the earth and sand separation work using the jet water flow is performed in the earth and sand collection tank 32 installed on the work table ship 31 is described. However, the earth and sand collection tank 32 is located on the ground near the dredging target water area. May be installed.

  Further, the separation work using the jet water flow may be performed at the water surface portion of the dredging target water area without using the earth and sand collection tank 32, and in that case, from the earth and sand container 12 by the overflow F. The discharged earth and sand component 37 settles on the water bottom A. In addition, a water surface part shall mean the fixed area over the water and water which made the water surface B a boundary here.

  Moreover, although the above-mentioned Example demonstrated the example which provided the permeation | transmission part 15 in the one end part of the earth-and-sand accommodating part 12 upper surface part, as shown in FIG. A pair of transmission portions 15 may be provided in a symmetrical arrangement. In addition, the same code | symbol is attached | subjected to the structure similar to the above-mentioned Example, and description is abbreviate | omitted.

  In this case, by jetting high-pressure water JW from the jet nozzles 18, 18... Through the transmission part 15 formed in one shell 10, a water flow is generated while supplying water into the earth and sand container 12. The sediment component 37 is pulled from the foreign material 36 by the water flow, and the water in the sediment storage unit 12 is stirred, and the stirring promotes the separation of the sediment component 37 and the foreign material 36 and is separated along with the stirring. The earth and sand component 37 and the foreign matter 36 are carried by the water stream and float.

  And when the water in which the earth and sand component 37 was mixed overflows from both the permeation | transmission parts 15 and 15, it is carried to the overflow F and the earth and sand component 37 is discharge | released out of the earth and sand accommodating part 12. FIG. At that time, since the permeation portion 15 on the shell 11 side is opened, the water mixed with the earth and sand component 37 by being pushed by the water flow easily flows over the permeation portion 15 on the shell 11 side.

  In each of the above-described embodiments, the example in which the jet nozzles 18, 18... Are installed on the arm 13 of the grab bucket 2 has been described, but the installation positions of the jet nozzles 18, 18. For example, it may be installed along the inner peripheral surface of the outer shell in the shells 10 and 11, and the jet nozzles 18, 18, etc. on the inner wall portion of the earth and sand collection tank 32 other than the grab bucket 2. May be installed in advance, and the grab bucket 2 may be moved into the earth and sand collection tank 32 according to the position.

  Moreover, a foreign material shall not be limited to the wood piece etc. which were illustrated in the above-mentioned Example, but shall mean all the things which are mixed in earth and sand and exist in a water bottom part.

A Water bottom B Water surface JW High pressure water F Overflow 1 Dredging device 2 Grab bucket 3 Operating means (crane device)
4 Grab dredger 5 Jib 6 Lifting wire 7 Operation wire 8 Upper frame 9 Lower frame 10, 11 Shell 12 Sediment storage part 13 Arm 15 Permeation part 16 Sealing door 17 Hinge 18 Jet nozzle 19 High pressure water supply means 20 Installation of water supply hose 21 Member 30 Foreign matter mixed earth and sand 31 Earth and sand transport ship 32 Earth and sand collection tank 33 Water storage 34 Pump 35 Drain hose 36 Foreign object 37 Earth and sand component 38 Air bubbles

Claims (11)

A grab bucket having an openable and closable earth and sand container composed of a plurality of shells and a dredging device comprising an operating means for operating the grab bucket is used to drown foreign matter mixed soil at the bottom of the water, and the dredged foreign matter In the separation method of dredged soil that separates mixed sediment into sediment components and foreign matter,
Using a grab bucket comprising a mesh-like or lattice-like transmission part on the upper surface part of the earth and sand container,
After grabbing foreign matter mixed sand at the bottom of the earth and sand in the earth and sand container, high pressure water is injected into the earth and sand container using a jet nozzle in a state where the earth and sand container is closed, and water is supplied into the earth and sand container. While producing a water flow, using the water flow to separate the foreign material mixed earth and sand into the foreign material and the earth and sand component, and overflowing the mixed water in a state where the earth and sand component is floating through the permeation portion, A method for separating dredged sand, characterized in that the earth and sand components are discharged out of the earth and sand container, and then foreign substances remaining in the earth and sand container are collected.   The method for separating dredged sand according to claim 1, wherein the jet nozzle is installed outside the earth and sand container, and the high-pressure water is injected into the earth and sand container through the transmission part.   Move the grab bucket that has grabbed foreign matter mixed earth and sand into the earth and sand collection tank installed on the trolley or on the ground, and jet high pressure water into the earth and sand container using the jet nozzle in the earth and sand collection tank, The dredged soil separation method according to claim 1 or 2, wherein water mixed in a state where the sediment component floats is allowed to overflow into the sediment collection tank.   The method for separating dredged sand according to claim 3, wherein water stored in the earth and sand recovery tank is supplied to the jet nozzle, and the stored water is circulated between the earth and sand recovery tank and the jet nozzle.   The earth and sand container is provided with a sealing door that opens and closes the permeation part, and the foreign substance mixed earth and sand at the bottom of the water is grasped with the permeation part closed, and then the permeation part is opened and high-pressure water is placed in the earth and sand container. The method for separating dredged material sand according to claim 1, wherein jetting is performed. A gutter device comprising a grab bucket having a plurality of shellable openable and closable earth and sand containers, and an operating means for operating the grab bucket, wherein the grab bucket grabs foreign matter mixed earth and sand at the bottom of the water. In
The top surface of the earth and sand container is provided with a net-like or lattice-shaped transmission part, and is provided with a jet nozzle that injects high-pressure water into the earth and sand container, and water is supplied into the earth and sand container by injecting the high-pressure water. While producing a water flow, using the water flow to separate the foreign material mixed earth and sand into the foreign material and the earth and sand component, and overflowing the mixed water in a state where the earth and sand component is floating through the permeation portion, A dredge apparatus characterized in that earth and sand components are discharged out of the earth and sand container.   The dredge apparatus according to claim 6, wherein the jet nozzle is installed outside the earth and sand container, and the high-pressure water is injected into the earth and sand container through the transmission part.   The dredge device according to claim 6 or 7, wherein the transmitting portion is provided so as to be shifted to one end portion of the upper surface portion of the earth and sand accommodating portion.   The dredge apparatus of Claim 6 or 7 which provides a pair of said permeation | transmission part in symmetrical arrangement at the both ends of the said earth-and-sand accommodating part upper surface part.   The dredge apparatus of Claim 6-8 or 9 provided with the sealing door which opens and closes the said permeation | transmission part in the said earth and sand accommodating part. The dredge device according to claim 6, further comprising air supply means for supplying air to the jet nozzle so that bubbles can be mixed into the high-pressure water.

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