JP6646459B2 - Pollution prevention structure for dredging work - Google Patents

Description

  The present invention relates to a pollution control structure for dredging work.

  2. Description of the Related Art Conventionally, in a dredging operation using a dredger, a pollution prevention frame for preventing the dredged soil from spreading and polluting surrounding waters is provided. Further, there is an operation of transferring the dredged earth and sand in the pollution prevention frame to an earth transport vessel by a bucket or the like.

  Generally, the earth transport vessel and the pollution control frame are not moored by rope. Therefore, there is a gap between the pollution prevention frame and the soil carrier. Therefore, when transferring the dredged earth and sand to the earth transport vessel, there is a possibility that earth and sand spilled from the bucket may fall into the gap to generate pollution.

  In view of the above problem, there is disclosed a configuration in which, for example, a soil transport board is provided with a pollution prevention plate that can be lowered with a winch that covers a gap between the soil transport vessel and the pollution prevention frame. The anti-pollution plate is configured to be pivotable in the vertical direction by pivotally supporting a base fixed to one end of the earth-shipping ship. By inclining the tip of the anti-pollution plate downward, the anti-pollution frame can be drawn to the soil transport vessel and also cover the gap between the soil transport vessel and the anti-pollution frame.

  That is, the above-mentioned anti-pollution plate has a function of attracting the anti-pollution frame to the soil transport ship (attraction function) and a function of covering the gap between the anti-pollution ship and the anti-pollution frame to prevent contamination by falling objects (anti-pollution function). ) (See Patent Document 1, for example).

Japanese Patent No. 5676229

  However, in the pollution prevention plate of Patent Document 1, when the water surface swings greatly, it becomes difficult to draw the pollution prevention frame, and the pollution prevention function may not be able to be exhibited. Further, when the water surface swings and moves in a direction away from each other, the tip end of the pollution prevention plate may come into contact with peripheral members and be damaged, when the water carrier swings and the pollution prevention frame is moved.

  The pollution prevention plate of Patent Literature 1 needs to have a sufficient size (length and width) to attract the pollution prevention frame. In addition, a device such as a winch is separately required to attach the pollution control plate to an earth transport ship. Therefore, the device becomes a large-scale device as a whole, and the cost increases.

  An object of one embodiment of the present invention has been made in view of the above problems, and it is an object of the present invention to provide a pollution prevention structure for dredging work, which can reliably exhibit a drawing function and a pollution prevention function, and is economical. It is in.

The above issues are
A pollution prevention frame arranged in front of the dredge, and a structure for preventing pollution of a dredging operation constructed using a soil carrier on which dredged earth and sand are loaded,
The pollution prevention frame is provided with a connecting means for connecting the pollution prevention frame and the soil carrier by being attracted to the side of the soil carrier by magnetic force ,
The connection means can be freely switched on and off of the magnetic force and can be solved by a pollution prevention structure for dredging work.

  ADVANTAGE OF THE INVENTION According to this invention, the attraction function and the pollution prevention function can be reliably demonstrated, and the pollution prevention structure for dredging work which is economical can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole figure which shows the state which implemented the pollution prevention structure for dredging work which concerns on embodiment of this invention. It is a partial expansion perspective view explaining the pollution prevention structure for dredging work concerning the embodiment of the present invention. A shows a state before the earth transport vessel and the pollution prevention frame are connected, and B shows a state where the earth transport vessel and the pollution prevention frame are connected. It is a figure explaining the construction procedure of the pollution prevention structure for dredging work which concerns on embodiment of this invention, and shows the process until a pollution prevention frame and an earth transport ship are connected by a connection means. It is a figure explaining the construction procedure of the pollution control structure for dredging work which concerns on embodiment of this invention, and shows the process from the connection of a pollution control frame and an earth transport ship until the connection is cancelled.

  Hereinafter, an embodiment of a pollution prevention structure for dredging work according to the present invention will be described. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description thereof will be appropriately simplified or omitted. The drawings are not intended to show relative ratios between members or components. Thus, the specific dimensions can be determined by one skilled in the art in light of the following non-limiting embodiments.

  FIG. 1 is an overall view showing a state in which a pollution prevention structure for dredging work according to an embodiment of the present invention is implemented. 1A shows a plan view, and FIG. 1B shows a front view of the pollution prevention frame as viewed from the front.

  The present invention is a structure for preventing contamination in a dredging operation performed using a pollution prevention frame 2 disposed in front of a dredge vessel 1 and an earth transport vessel 3 on which dredged earth and sand are loaded.

  The dredger 1 is a grab dredger, a backhoe dredger, or the like, and has a hoist 6. Although the illustrated example of the dredger 1 is a grab type dredger, the present invention is not limited to this.

  The hoist 6 has a grab bucket 61 at the tip end, and the grab bucket 61 is connected to a main body 60 of the hoist 6 by a boom 62 via a wire 63. The grab bucket 61 is moved up and down by the unwinding or winding operation of the wire 63. The main body 60 of the hoist 6 is configured to be capable of turning, and the turning of the main body 60 causes the boom 62 to turn to a predetermined position. The boom 62 is configured to be able to be raised and lowered in a vertical direction (up and down direction).

  The pollution prevention frame 2 has a float body 21 and a pollution prevention film 22. The float body 21 is assembled in a rectangular (square) shape with one side of 15 to 25 m. Specifically, the pollution prevention frame 2 is formed by combining steel pipes having hollow portions in a rectangular shape as shown in FIG. The steel pipe used may be a square steel pipe or a round steel pipe.

  The pollution prevention film 22 is a film that hangs down from each side of the float body 21 and surrounds the area to be dredged. A weight member may be attached to the lower end of the pollution prevention film 22.

  In the dredging operation, first, a pollution prevention frame 2 surrounding the dredging area in a rectangular shape is moored in front of the dredging vessel 1 by a rope 4 or the like, and an earth transport vessel 3 is moored to the side of the dredging vessel 1 by a rope 5 or the like. The soil carrier 3 is arranged so as to be juxtaposed with the dredger 1 and the pollution prevention frame 2.

  Then, the inside of the pollution prevention frame 2 is dredged by the grab bucket 61 of the lifting machine 6, the grab bucket 61 holding the dredged earth and sand is pulled up to the water, and the lifting machine 6 is moved so that the grab bucket 61 comes on the soil carrier 3. Is turned, the grab bucket 61 is opened, and the dredged earth and sand is loaded on the earth transport vessel 3.

  In the present invention, during the movement of the grab bucket 61, earth and sand and muddy water spill from the gap of the grab bucket 61 into the gap between the pollution prevention frame 2 and the earth transport ship 3, and pollution occurs outside the pollution prevention frame. And a structure for preventing the Hereinafter, this point will be described.

  The details of the pollution prevention structure for dredging work of the present invention will be described with reference to FIGS. FIG. 2 is a partially enlarged perspective view illustrating a pollution prevention structure for dredging work according to the embodiment of the present invention. FIG. 2A shows a state before the earth transport vessel and the pollution prevention frame are connected, and FIG. 2B shows a state where the earth transport vessel and the pollution prevention frame are connected. Although the dredger 1 is arranged on the arrow Y2 side in the illustrated example, it is omitted for the sake of explanation.

  The pollution prevention structure for dredging work according to the present invention comprises: a connecting means 7 for adsorbing to the side of the soil transport ship 3 by magnetic force to connect the pollution prevention frame 2 to the soil transport ship 3; An anti-contamination sheet 8 is provided which hangs from the portion 32 into the anti-contamination frame 2.

  The connecting means 7 is provided on the upper surface of the float body 21 of the pollution prevention frame 2. More specifically, the connecting means 7 is provided on the side 21R of the float body 21 on the earth transport ship 3 side (arrow X1 side). In the illustrated example, the connecting means 7 is provided only on one side (side 21R) on the arrow X1 side, but may be provided on the opposing side 21L on the X2 side. Then, it is possible to cope with the case where the earth transport ship 3 comes to either the side 21R side or the side 21L side. Although two connecting means 7 are provided for one side in the illustrated example, one or more connecting means 7 may be provided. The location of the connecting means 7 is not limited to the upper surface of the float body 21 but may be a side surface or a bottom surface of the float body 21.

  The connecting means 7 has a base 71 fixed to the float body 21 and an adsorbing section 72 for adsorbing to the earth moving ship 3. The connecting means 7 is a small device.

A magnet is mounted on the attraction unit 72, and has a configuration in which magnetic force can be freely switched on and off. When the magnetic force is on, the suction portion 72 is located on the side of the ship 3 (hereinafter referred to as the side surface 31).
When the magnetic force is off, the suction between the suction portion 72 and the side surface 31 of the earth transport ship is released.

  As the on / off switching means of the magnetic force, an “NS inversion method” or the like may be used. Further, an electromagnetic force generated by an electric current may be used. The magnet may use neodymium. The connecting means 7 of the present embodiment has a magnetic force capable of being attracted (adhered) to the side surface 31 of the earthmoving ship 3. The favorable magnetic force is a magnetic force that can follow the swing of the earth moving ship 3 and can maintain the attraction force with the earth moving ship 3.

  The connecting means 7 has remote control means (not shown) for remotely controlling on and off of the magnetic force. As the remote control means, a method of causing compressed air to flow into the adsorption section 72 containing a magnet may be used. As an example, remote control means may be used in which one end of a hose through which compressed air flows into the suction section 72 is connected, and an operating device for controlling the flow of compressed air is connected to the other end of the hose. The N-pole and the S-pole of the magnet in the attraction part 72 are reversed by the inflowing compressed air, and the magnetic force is switched on and off.

  As shown in FIG. 2A, the connecting means 7 preferably turns on the magnetic force when the earth transport ship 3 approaches. In the present embodiment, when the distance between the connecting means 7 and the earth transport vessel 3 becomes, for example, less than 1 m, the magnetic force is turned on by operating the remote control means. Then, the connecting means 7 can exert a function of drawing the soil carrier 3 to the pollution prevention frame 2.

  Then, as shown in FIG. 2B, the connecting means 7 is adsorbed on the side surface 31 of the soil transport ship 3 by the suction part 72, and directly connects the pollution prevention frame 2 and the earth transport ship 3. Accordingly, the gap between the pollution prevention frame 2 and the earth transport ship 3 is substantially zero, and it is possible to reliably prevent the occurrence of pollution due to earth and sand or muddy water falling into the gap. However, the gap between the pollution prevention frame 2 and the earth transport ship 3 may have a slight gap other than substantially zero. At this time, it is preferable to arrange a pollution prevention sheet 8 that hangs down from the one side edge 32 of the earth transport ship 3 into the pollution prevention frame 2 described later.

Next, the pollution prevention sheet 8 will be described.
The pollution prevention structure for dredging work according to the present invention includes a pollution prevention sheet 8 that hangs down from one side edge 32 of the earthmoving ship 3 into the pollution prevention frame 2.

  The upper side 8 </ b> A of the pollution prevention sheet 8 is fixed on the one side edge 32 of the soil carrier 3. A weight member 81 is attached to the free lower side 8B that is not fixed. The anti-pollution sheet 8 having the above configuration is suspended between the soil carrier 3 and the anti-pollution frame 2 by hanging the lower side 8B into the anti-pollution frame 2.

  The wire 10 is connected to the weight 81. One end of the wire rod 10 is fixed to the support 9 on one side edge 32 of the soil carrier 3. Therefore, the contamination prevention sheet 8 can be pulled up by pulling up the wire rod 10.

  As shown in FIG. 2A, the pollution prevention sheet 8 is disposed on the one side edge 32 in a state where the lower side 8B is wound around an axis before being connected to the soil carrier 3 and the pollution prevention frame 2 as shown in FIG. 2A. May be. Of course, at times other than the work, the pollution prevention sheet 8 is removed from the one side edge 32 and stored in a separately prepared storage box or the like. At work, the pollution prevention sheet 8 is placed on the one side edge 32 as described above. May be installed.

  Then, as shown in FIG. 2B, when the earth transport vessel 3 and the pollution prevention frame 2 are connected by the connecting means 7, the lower side 8B of the pollution prevention sheet 8 is drooped into the pollution prevention frame 2 and the pollution prevention sheet 8 Between the soil carrier 3 and the pollution prevention frame 2. Note that arrows G1 and G2 shown in FIG. 2B indicate movement lines of the grab bucket 61. That is, the pollution prevention sheet 8 is disposed immediately below the movement line of the grab bucket 61 holding the dredged earth and sand.

  Therefore, even if the soil prevention sheet 8 drops earth and sand or muddy water while the grab bucket 61 is moving on the movement line, it can receive the fallen object and return it to the inside of the pollution prevention frame 2. Therefore, the above-mentioned anti-contamination sheet 8 can prevent a falling object from riding on the float body 21 of the anti-contamination frame 2 and subsequently dropping into the surrounding water area to contaminate the surrounding water area.

  As described above, the pollution prevention structure for dredging work of the present invention has a structure in which the pollution prevention frame 2 and the earth transport vessel 3 are connected by the magnetic force of the connecting means 7 provided on the pollution prevention frame 2, so that the pulling function is provided. Thus, the pollution prevention function can be reliably exhibited. Since the connecting means 7 is small and is only installed on the float body 21 of the pollution prevention frame 2, it is economical without a large-scale device.

  The pollution prevention structure for dredging work of the present invention has a configuration provided with a pollution prevention sheet 8 that hangs down from one side edge 32 of the earthmoving ship 3 into the pollution prevention frame 2. Therefore, even when a gap exists between the pollution prevention frame 2 and the soil transport ship 3 in the connection between the pollution prevention frame 2 and the soil transport ship 3 by the connecting means 7, the gap is covered with the pollution prevention sheet 8. Can be. Then, even if the soil and turbid water are dropped while the grab bucket 61 is moving on the movement line, the pollution prevention sheet 8 receives the fallen object and returns it to the inside of the pollution prevention frame 2. Can be reliably prevented from falling and causing pollution.

  Furthermore, the pollution prevention structure for dredging work of the present invention has a very simple configuration in which the pollution prevention frame 2 is provided with the connecting means 7 and the pollution prevention sheet 8 is merely disposed on the soil carrier 3, so that it has versatility. high. In addition, since the connecting means 7 and the pollution prevention sheet 8 are relatively inexpensive, the connecting means 7 may be connected to the two sides of the float body 21 (the arrow X1 side and X2 side), and the pollution prevention sheet 8 can be positively installed on both sides (on both side edges) of the earthmoving ship 3. Then, the effect of the present invention can be expected, and the operation management of the earthmoving ship 3 can be facilitated regardless of whether the earthmoving ship 3 approaches the left or right (arrows X1 side and X2 side) of the dredger 1.

<Construction procedure>
Next, a construction procedure of the pollution prevention structure for dredging work according to the embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows a process until the pollution prevention frame 2 and the soil carrier 3 are connected by the connecting means 7.

  First, as shown in FIG. 3A, the earth transport vessel 3 is guided to the location of the dredger 1 by the auxiliary vessel 100. At this time, the pollution prevention sheet 8 is installed in a state of being stored on one side edge 32 of the earth transport ship 3. In addition, the guidance of the earth transport ship 3 and the dredger 1 may use a pushboat or the like.

  As shown in FIG. 3B, when the earth transport vessel 3 berths on the right side (arrow X1 side) of the dredger 1, the earth transport vessel 3 is moored to the side of the dredger 1 by a rope 5 or the like, and the earth transport vessel 3 is attached. It is arranged so as to be juxtaposed with the dredger 1 and the pollution prevention frame 2. At that time, the pollution prevention frame 2 is located on the bow side (arrow Y2 side) of the earth transport ship 3.

  Thereafter, the auxiliary ship 100 pushes the bow side of the earthing ship 3 so that the side surface 31 of the earthing ship 3 on the bow side approaches the connecting means 7 installed on the pollution prevention frame 2. At this time, the magnetic force of the connecting means 7 is turned on by operating the remote control means.

  The X2 side surface 31 of the earth moving ship 3 comes into contact with the connecting means 7 by the guidance force of the auxiliary ship 100 and the drawing force (magnetic force) of the connecting means 7. Then, the side surface 31 of the soil carrier 3 is connected to the pollution prevention frame 2 by the magnetic force of the connecting means 7 as shown in FIG. 3C. Thereafter, the contamination prevention sheet 8 is extended, and the lower side 8B of the contamination prevention sheet 8 is hung into the contamination prevention frame 2 (see FIG. 2B).

  Next, a process until the connection between the pollution prevention frame 2 and the earth transport ship 3 is released will be described with reference to FIG.

  First, as shown in FIG. 4A, the dredger 1 performs a dredging operation by the hoist 6 while the pollution prevention frame 2 and the soil carrier 3 are connected by the connecting means 7. That is, the lifting machine 6 dredges the earth and sand in the pollution prevention frame 2 by the grab bucket 61. Then, the hoist 6 lifts the grab bucket 61 holding the dredged earth and sand, and then turns the main body 60 of the hoist 6 so that the grab bucket 61 comes on the soil carrier 3 to open the grab bucket 61. The earth and sand are put into the earth transport ship 3. Thereafter, the lifting machine 6 rotates the main body 60 to dispose the grab bucket 61 on the pollution prevention frame 2. The dredging work is performed by repeating the above operation.

  At the time of the dredging work, the gap between the pollution prevention frame 2 and the earth transport vessel 3 has been completely eliminated by the connection by the pollution prevention sheet 8 and the connecting means 7 as described above, so that the soil and muddy water fall into the gap. Therefore, the occurrence of contamination can be reliably prevented. Also, when the grab bucket 61 is moving on the movement line G1-G2, even if the earth and sand or turbid water is dropped, the pollution prevention sheet 8 receives the fallen object and returns it to the inside of the pollution prevention frame 2. The risk of contamination can be prevented beforehand.

  When the dredging operation is completed, first, the contamination prevention sheet 8 is pulled up by the wire 10 as shown in FIG. 4B. After lifting the contamination prevention sheet 8, the magnetic force of the connecting means 7 is turned off by the remote control means. Then, the mooring of the rope 5 is released, and the mooring state of the earth transport ship 3 with the dredger 1 is released.

  Then, as shown in FIG. 4C, the earth transport ship 3 leaves the dredger 1. Thereafter, the contamination prevention sheet 8 is stored in an appropriate place.

  As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific embodiments described above, and various modifications may be made within the scope of the present invention described in the claims. It can be modified and changed.

1 Dredge 2 Pollution prevention frame 21 Float 21R side (the right side of the float)
21L side (left side of float)
22 Pollution prevention film 3 Earth transport ship 31 Side surface 32 One side edge 4, 5 Rope 6 Lifting machine 60 Main body 61 Grab bucket 62 Boom 7 Connecting means 71 Base 72 Suction unit 8 Pollution prevention sheet 8A Upper side 8B Lower side 81 Weight member 9 Support Body 10 Wire rod 100 Auxiliary ship

Claims (4)

A pollution prevention frame arranged in front of the dredge, and a structure for preventing pollution of a dredging operation constructed using a soil carrier on which dredged earth and sand are loaded,
The pollution prevention frame is provided with a connecting means for connecting the pollution prevention frame and the soil carrier by being attracted to the side of the soil carrier by magnetic force ,
The pollution prevention structure for dredging work , wherein the connecting means is capable of freely switching on and off of the magnetic force . The pollution prevention structure for dredging work according to claim 1 , wherein the connecting means has a remote control means for remotely turning on and off the magnetic force. The earth transport ship has
The pollution prevention for dredging work according to claim 1, wherein an upper side is fixed to one side edge of the earthmoving ship, and a lower side is provided with a pollution prevention sheet hanging down into the pollution prevention frame. Construction. The pollution prevention sheet, a weight material is attached to the lower side,
The pollution prevention structure for dredging work according to claim 3 , wherein a wire rod having one side end fixed to the one side edge of the earth carrier is connected to the weight member.

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