JP6684656B2 - Pollution prevention structure and drawing device for dredging work - Google Patents

Description

  The present invention relates to a pollution prevention structure and a drawing device for dredging work.

  2. Description of the Related Art Conventionally, in dredging work by a dredger, a pollution prevention frame has been provided to prevent the dredged soil from spreading and polluting the surrounding water area. In addition, the work of transferring the dredged soil in the pollution prevention frame to an earth carrier using a bucket or the like is performed.

  Generally, the earth carrier and the pollution control frame are not anchored by rope. Therefore, there is a gap between the pollution prevention frame and the earth transportation ship. Therefore, when the dredged sediment is transferred to the earth carrier, there is a possibility that the sediment and muddy water spilled from the bucket may fall into the gap and cause pollution.

  In view of the above problem, for example, a configuration is disclosed in which an earth transportation ship is provided with a pollution prevention plate that also serves as a pulling device that can be lowered by a winch that covers a gap between the earth transportation ship and the pollution prevention frame. The pollution prevention plate is configured to be tiltable in the vertical direction by pivotally supporting a base fixed to one end of the earth transport ship. By tilting the tip of the pollution prevention plate downward, the pollution prevention frame can attract the pollution prevention frame to the earth transportation ship and can cover the gap between the earth transportation ship and the pollution prevention frame.

  That is, the above-mentioned pollution prevention plate has a function of attracting the pollution prevention frame to the earth transportation ship (attraction function) and a function of covering the gap between the soil transportation ship and the pollution prevention frame to prevent contamination due to falling objects (contamination). It exhibits both of the prevention functions) (for example, refer to Patent Document 1).

Japanese Patent No. 5676229

  However, in the pollution prevention plate of Patent Document 1, when the water surface swings significantly, it becomes difficult to draw the pollution prevention frame, and there are cases where the pollution prevention function cannot be exhibited. In addition, when the water surface oscillates and moves in a direction in which the soil ship and the pollution prevention frame move away from each other, the tip of the pollution prevention plate may come into contact with peripheral members and be damaged.

  The pollution prevention plate of Patent Document 1 needs to have a size (length and width) sufficient to draw the pollution prevention frame. In addition, a device such as a winch is required to attach the pollution prevention plate to the earthmoving ship. Therefore, the device is large-scale and the cost is high.

  An object of one embodiment of the present invention was made in view of the above problems, and provides a pollution preventing structure for dredging work, which can reliably exhibit a drawing function and a pollution preventing function, and which is economical. Especially.

The above issues are
A structure for preventing pollution of dredging work constructed using a pollution prevention frame arranged in front of the dredging ship and an earth carrier carrying dredged sand,
The pollution prevention frame is provided with a pulling device that is attracted to the port side of the soil transportation ship by magnetic force to connect the pollution prevention frame and the soil transportation ship,
The attracting device is
A fixed plate fixed in a manner of standing upright in the vertical direction with respect to the pollution prevention frame, and a suction unit provided on the fixed plate and movable in the horizontal direction,
The adsorption unit,
A rod part that is inserted into a through hole provided in the fixed plate and that is movable in the horizontal direction, and a connecting plate that is connected to the tip of the rod part and that is movable in accordance with the horizontal movement of the rod part. And three or more caster portions provided on the outer peripheral surface of the connecting plate on the side of the earth transporting ship and contacting the earth transporting ship, and provided on the outer peripheral surface of the connecting plate on the side of the earth transporting ship, A magnetic force generating section equipped with a magnet having a height lower than that of the caster section;
It can be solved by a pollution prevention structure for dredging work, which is characterized by having

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

It is the whole figure showing the state where the pollution prevention structure for dredging work concerning a 1st embodiment was carried out. It is a rear perspective view explaining the composition of the attracting device which constitutes the pollution prevention structure for dredging work concerning a 1st embodiment. It is a cross-sectional view of FIG. It is a partial expansion perspective view explaining the pollution prevention structure for dredging work concerning a 1st embodiment. A shows the state before the earth carrier and the pollution prevention frame are connected, and B shows the state where the earth carrier and the pollution prevention frame are connected. C shows the state of the attracting device and the earthmoving ship during the dredging work. It is a figure explaining the construction procedure of the pollution prevention structure for dredging work which concerns on 1st Embodiment, and shows the process until a pollution prevention frame and an earthmoving 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 1st Embodiment, and shows the process from the connection of a pollution control frame and an earth transport ship to this connection cancellation | release. It is a partially expanded perspective view which shows the state which implemented the pollution prevention structure for dredging work which concerns on 2nd Embodiment. It is a rear perspective view explaining the composition of the drawing device which constitutes the pollution prevention structure for dredging work concerning a 2nd embodiment.

  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 parts are designated by the same reference numerals, and the duplicate description thereof will be appropriately simplified or omitted. The drawings are not intended to show relative ratios between members or components. Accordingly, specific dimensions can be determined by one of ordinary skill in the art in light of the following non-limiting embodiments.

[First Embodiment]
FIG. 1 is an overall view showing a state in which a pollution prevention structure for dredging work according to the first embodiment 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 embodiment has a structure for preventing pollution of a dredging work that is carried out by using a pollution prevention frame 2 arranged in front of the dredging ship 1 and an earth carrier 3 on which dredged sand is loaded.

  The dredger 1 is a grab-type dredger, a backhoe-type dredger, or the like, and has a lifting machine 6. The dredger 1 in the illustrated example is a grab-type dredger, but it is not limited to this.

  The lifting machine 6 has a grab bucket 61 at its tip, and the grab bucket 61 is connected to the main body 60 of the lifting machine 6 by a boom 62 via a wire 63. The grab bucket 61 is vertically moved up and down by unwinding or winding up the wire 63. The main body 60 of the lifting machine 6 is configured to be pivotable, and the boom 62 is pivoted to a predetermined position by pivoting of the main body 60. The boom 62 is configured so that it can be raised and lowered in the vertical direction (vertical 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 shape having a side of 15 to 25 m. Specifically, the pollution prevention frame 2 is formed by combining steel pipes having a hollow portion in a rectangular shape as shown in FIG. The steel pipe used may be a rectangular steel pipe or a circular steel pipe.

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

  In the dredging work, first, the pollution prevention frame 2 surrounding the dredging area in a rectangular shape is anchored in front of the dredger 1 with a rope 4 or the like, and the earth transporter 3 is anchored with a rope 5 or the like on the port side of the dredger 1. 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 sand is pulled up to the surface of the water, and the lifting machine 6 is placed so that the grab bucket 61 is on the earth carrier 3. The main body 60 is rotated, the grab bucket 61 is opened, and the dredged earth and sand is loaded on the earth carrier 3.

  In the present embodiment, 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 carrier 3, and pollution occurs outside the pollution prevention frame. It is equipped with a structure to prevent this. The point will be described below.

  Details of the pollution prevention structure for dredging work of the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 2 is a rear perspective view illustrating the configuration of the attracting device that constitutes the pollution prevention structure for dredging work according to the present embodiment. FIG. 3 is a cross-sectional view of FIG.

  FIG. 4A shows a state before the earth carrier and the pollution prevention frame are connected, and FIG. 4B shows a state where the earth carrier and the pollution prevention frame are connected. FIG. 4C shows a state of the attracting device and the earthmoving ship during the dredging work. In the illustrated example, the dredger 1 is arranged on the arrow Z1 side, but it is omitted for the sake of explanation.

  The pollution prevention structure for dredging work according to the present embodiment is one of the attracting device 7 that attracts to the port side of the soil transportation ship 3 by magnetic force and connects the pollution prevention frame 2 and the soil transportation ship 3, and the soil transportation ship 3. The pollution prevention sheet 8 is provided so as to hang down from the side edge portion 32 into the pollution prevention frame 2.

(Attractor)
First, the configuration of the attracting device 7 will be specifically described with reference to FIGS. 2 and 3.

  The attracting device 7 is provided on the upper surface of the float body 21 of the pollution prevention frame 2. Specifically, the attracting device 7 is provided on the side 21R of the float body 21 on the side of the soil carrier 3 (arrow X1 side). In the illustrated example, the drawing device 7 is provided only on one side (side 21R) on the arrow X1 side, but may also be provided on the opposite side 21L on the X2 side. Then, it is possible to cope with whether the earthmoving ship 3 comes to the side 21R side or the side 21L side. Two attracting devices 7 in the illustrated example are provided for each side, but one or more attracting devices may be provided. The location of the attracting device 7 is not limited to the upper surface of the float body 21, but may be the side surface or the bottom surface of the float body 21.

  The attracting device 7 includes a fixed plate 71 fixed in a state of standing upright in a vertical direction (arrow Y1-Y2 direction) with respect to a pedestal 23 fixed to the float body 21, and a horizontal direction provided on the fixed plate 71. It includes a suction unit 700 that can move in the directions of arrows X1-X2. The attracting device 7 may be a relatively small device.

  The pedestal 23 is a substantially rectangular block body, and has a support member 23 a that supports the lower end of the fixed plate 71 on the upper surface. The support member 23a in the illustrated example is a pair of support plates facing each other that can support both surfaces of the lower end of the fixed plate 71, but this is not a limitation.

  The fixed plate 71 is a plate that stands upright in the vertical direction, and may be made of metal. The fixed plate 71 is integrated with the pedestal 23 by the support member 23a of the pedestal 23 so as not to move in the horizontal direction (arrow X1-X2 direction). The fixed plate 71 has a through hole 71a at a substantially central position for inserting a rod portion 710 described later. The through hole 71a of the fixed plate 71 is configured to allow the rod portion 710 that has been inserted to move in the horizontal direction, and does not fix the rod portion 710. However, in order to prevent the rotation of the rod portion 710, a key may be provided on the rod portion 710 side and a key groove may be provided on the through hole 71a side. Further, the arrangement relationship between the key and the key groove may be reversed. The fixed plate 71 in the illustrated example has a pentagonal shape, but is not limited to this and may have a triangular shape or a circular shape.

  The suction part 700 has a rod part 710, a connecting plate 720, a caster part 730, and a magnetic force generation part 740.

  The rod portion 710 is inserted into a through hole 71 a provided in the fixed plate 71 and is horizontally movable, and a connecting portion 712 provided at the tip of the shaft portion 711 (arrow X1 side). have. The shaft 711 is preferably a circular pipe having a hollow portion. Of course, the pipe may be polygonal rather than circular. The connecting portion 712 is a member that connects the connecting plate 720 and is C-shaped steel in the illustrated example, but its shape is not limited. In the connecting portion 712 in the illustrated example, a magnetic force generating portion 740, which will be described later, is arranged in the opening of the C-shaped steel.

  The connection plate 720 is a plate that is arranged so as to stand upright in the vertical direction, and may be made of metal. The connecting plate 720 is connected to the tip of the rod portion 710 (on the side of the arrow X1) and is configured to be movable according to the horizontal movement of the rod portion 710. The fixed plate 71 in the illustrated example has a pentagonal shape, but is not limited to this and may have a triangular shape or a circular shape. The connecting plate 720 in the illustrated example is provided with a fitting hole 721 into which a part of a magnetic force generating unit 740 described later can be fitted. However, it is also possible to carry out without providing the fitting hole.

  A plurality of caster parts 730 are provided on the outer peripheral surface of the connecting plate 720 on the side of the earth carrier 3 (arrow X1 side). In the illustrated example, the number is 5, but it may be 3 or more. The caster portion 730 has a caster mechanism that is commonly used for chairs and mobile carts, and has a support portion 731 and a roller portion 732. The support portion 731 has one end connected to the outer peripheral surface of the coupling plate 720 and the other end connected to the roller portion 732. The roller portion 732 rotates about the shaft pin 732a in the arrow P1 direction and also rotates about the support portion 731 in the arrow P2 direction by 360 degrees. The caster portion 730 is a member that comes into contact with the side surface 31 of the earthmoving ship 3 as shown in FIG. Therefore, the caster portion 730 having the above-described configuration can allow the rocking of the earthmoving ship 3 when the roller portion 732 freely rotatable in the directions of the arrows P1 and P2 comes into contact with the side surface 31 of the earthmoving ship 3.

  A magnet 741 is mounted on the magnetic force generator 740. The magnetic force generator 740 is provided on the outer peripheral surface of the connecting plate 720 on the side of the earth carrier 3 (arrow X1 side) as shown in FIG. 3, and has a height lower than that of the caster 730. That is, when the caster portion 730 contacts the side surface 31 of the soil transportation ship 3, the space S is formed between the side surface 31 of the soil transportation ship 3 and the magnetic force generation portion 740. That is, in this embodiment, the magnetic force generator 740 and the earthmoving ship 3 are not in contact with each other, and the magnet 741 is attracted to the port side of the earthmoving ship 3 by the magnetic force.

  Therefore, the attracting device 7 can deal with the rocking of the earthmoving ship 3 while keeping the attraction force of the magnetic force generating portion 740 constant by the caster portion 730.

  As shown in FIG. 3, the attracting device 7 of the present embodiment has remote operation means 760 capable of switching on and off of the magnetic force in the magnetic force generation section 740 by remote operation.

  The remote control means 760 is connected to the magnetic force generator 740, and has an air hose 761 for reversing the N pole and S pole of the magnet 741 by compressed air, and an operation control section 762 connected to the air hose 761 and controlling the supply of compressed air. Have. The air hose 761 has an on-side hose 761a for turning on the magnetic force and an off-side hose 761b for turning off the magnetic force. Of course, it is also possible to carry out with only one air hose. At that time, a branch hose, a solenoid valve, an electric wire for valve control, etc. may be separately prepared.

  The operation control unit 762 is installed in a place where the operability of the operator is high, such as the dredger 1, and allows compressed air to flow into the magnet 741 in the magnetic force generation unit 740 by the air hose 761 via an operation unit (not shown). Then, the magnetic force is switched on and off by reversing the N pole and the S pole.

  When the magnetic force is on, the adsorption part 700 adsorbs to the port side (hereinafter referred to as the side surface 31) of the earthmoving ship 3, and when the magnetic force is off, the adsorption between the adsorption part 700 and the side surface 31 of the earthmoving ship is released. To be done.

  The magnet 741 may use neodymium. The magnet 741 of this embodiment has a magnetic force capable of being attracted (bonded) to the side surface 31 even if there is a space S between the magnet 741 and the side surface 31. A good magnetic force is a magnetic force that can follow the swing of the earthmoving ship 3 and can maintain the attraction force with the earthmoving ship 3. The remote operation means may be a means that utilizes an electromagnetic force generated by an electric current, instead of the above-mentioned "NS inversion method" using compressed air.

  Further, the illustrated air hose 761 is configured to be exposed to the outside of the rod portion 710, but the configuration is not limited to this, and may be disposed inside the hollow portion of the rod portion 710.

The attracting device 7 of this embodiment further includes a movable plate 750.
The movable plate 750 is a plate arranged so as to stand upright in the vertical direction, and may be made of metal. The movable plate 750 is arranged on the side of the fixed plate 71 opposite to the connecting plate 720 (arrow X2 side). The movable plate 750 has a through hole 751 through which the rod portion 710 is inserted and a fixed portion 752 that integrally fixes the rod portion 710 through the through hole 751 at a substantially central position. The fixed portion 752 is formed by welding or a nut, for example. When fixing with a nut, the outer peripheral surface of the rod portion 710 is formed into a bolt shape. The movable plate 750 in the illustrated example has a pentagonal shape, but is not limited to this and may have a triangular shape or a circular shape.

  As described above, the rod portion 710 is configured to be integrated with the movable plate 750 and the connecting plate 720. Further, the rod portion 710 is configured to be horizontally movable by an air spring device 770 described later.

  The pulling device 7 of the present embodiment has an air spring device 770 that moves the rod portion 710 in the horizontal direction.

  The air spring device 770 includes a first air spring portion 771 arranged between the fixed plate 71 and the connecting plate 720, and a second air spring portion 772 arranged between the fixed plate 71 and the movable plate 750. Have The air spring device 770 further includes a first spring air hose 771a that supplies and exhausts air to and from the first air spring portion 771, and a second spring air hose 772a that supplies and exhausts air to and from the second air spring portion 772. have.

  The first air spring portion 771 has a stretchable structure that expands by the inflowing compressed air and contracts when the inflowing compressed air is discharged. The illustrated first air spring portion 771 is configured to have a plurality of bellows portions. The second air spring portion 772 has substantially the same configuration as the first air spring portion 771.

  The first spring air hose 771a and the second spring air hose 772a may be connected to an operation control unit 762 having an operation unit. Therefore, the operation control unit 762 controls the supply / exhaust of compressed air to / from the first air spring unit 771 by the first spring air hose 771a to control the expansion / contraction of the first air spring unit 771. The expansion / contraction control of the second air spring portion 772 is similar.

  Although a plurality of first air spring portions 771 and second air spring portions 772 are provided in the illustrated example, they may be provided individually. Further, a donut type air spring having a through hole in the central portion may be used, or the rod portion 710 may be arranged at the position of the through hole. In addition, the first air spring portion 771 and the second air spring portion 772 of the present embodiment also have a function as a cushioning material that relieves a collision force when the earth transporter 3 is connected.

  Next, the operation of the air spring device 770 that horizontally slides the rod portion 710 will be briefly described.

  First, the operation of the air spring device 770 when the rod portion 710 is slid toward the earth transporter 3 side (arrow X1 side) will be described.

  The operator operates the operation unit of the operation control unit 762 to supply the compressed air into the first air spring unit 771 by the air hose 771a for the first spring to extend the first air spring unit 771 and at the same time to the second air spring unit 771. The compressed air in the second air spring portion 772 is exhausted by the spring air hose 772a to contract the second air spring portion 772.

  Then, the rod portion 710 slides to the side of the earthmoving ship 3, and the caster portion 730 arranged on the connecting plate 720 connected to the rod portion 710 approaches the side surface 31 of the earthmoving ship 3. Although this operation will be described in detail later, this operation is performed when the soil ship 3 approaches the pollution prevention frame 2 but is at a distance where the magnetic force of the magnetic force generation unit 740 does not act, and the attraction force by the magnetic force of the magnetic force generation unit 740 is used. Available at an early stage.

  Next, the operation of the air spring device 770 when the rod portion 710 is slid to the pollution prevention frame 2 side (arrow X2 side) will be described.

  The operator operates the operation section of the operation control section 762 to supply compressed air into the second air spring section 772 by the second spring air hose 772a to extend the second air spring section 772, and at the same time to the first air spring section 772. The compressed air in the first air spring portion 771 is exhausted by the spring air hose 771a to contract the first air spring portion 771. Then, the rod portion 710 slides to the pollution prevention frame 2 side (arrow X2 side).

  As will be described later, when the magnetic force of the magnetic force generation unit 740 is in the ON state, the first air spring unit 771 extends and the side surface 31 of the earthmoving ship 3 and the caster unit 730 are in contact with each other, the rod unit 710 is set to the above method. By moving to the pollution prevention frame 2 side with, the soil ship 3 can be drawn to the pollution prevention frame 2.

  Since the attracting device 7 of the present embodiment has the above-described configuration, the pollution prevention frame 2 and the earthmoving ship 3 can be connected by the operation shown in FIG. In FIG. 4, the air hose 761 and the spring air hoses 771a and 772a are omitted for the sake of explanation.

  As shown in FIG. 4A, the attracting device 7 causes the operation control unit 762 to extend the first air spring portion 771 and contract the second air spring portion 772 when the earthmoving ship 3 approaches. Then, the rod portion 710 slides toward the earth transportation ship 3 side, and the caster portion 730 approaches and contacts the side surface 31 of the earth transportation ship 3. Further, the attracting device 7 causes the operation control unit 762 to turn on the magnetic force of the magnetic force generation unit 740.

  In the present embodiment, the magnetic force is turned on by the operation control unit 762 when the distance between the attracting device 7 and the earthmoving ship 3 is less than 0.1 m, for example. Then, the attracting device 7 can exert a function of attracting the earthmoving ship 3 to the pollution prevention frame 2.

  Then, as shown in FIG. 4B, the attracting device 7 is attracted to the side surface 31 of the soil transportation vessel 3 by the magnetic force generation portion 740 of the adsorption portion 700 to connect the pollution prevention frame 2 and the soil transportation vessel 3. At that time, it is the caster portion 730, not the magnetic force generating portion 740, that is in direct contact with the earthmoving ship 3. However, due to the magnetic force of the magnetic force generator 740, the earthmoving ship 3 is connected to the pollution prevention frame 2.

  The dredger 1 performs the dredging work by the lifting machine 6 while the pollution prevention frame 2 and the soil carrier 3 are connected by the drawing device 7. Then, as shown in FIG. 4C, the earthmoving ship 3 sinks due to the loaded earth and sand.

  In the attracting device 7 of the present embodiment, the magnetic force generation unit 740 that exerts the attraction force does not contact the soil transportation ship 3, and the caster unit 730 and the soil transportation ship 3 directly contact each other, but the magnetic force generation unit 740 It is a structure that can exert adsorption force. Therefore, it is possible to hold the position of the attracting device 7 while allowing the attracting force of the magnetic force generating portion 740 to be exerted by the caster portion 730 while allowing the earth transporter 3 side to descend.

  Therefore, the gap between the pollution prevention frame 2 and the soil carrier 3 becomes substantially 0 even during the dredging work, and it is possible to reliably prevent the soil and sand and the muddy water from falling into the gap and causing the pollution. However, the gap between the pollution prevention frame 2 and the soil transport ship 3 may be substantially zero, and a slight gap may be present. At that time, it is preferable to dispose the pollution prevention sheet 8 that hangs down from one side edge portion 32 of the earth transportation ship 3 described later into the pollution prevention frame 2.

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

  An upper side 8A of the pollution prevention sheet 8 is fixed on the one side edge portion 32 of the earthmoving ship 3. A weight member 81 is attached to the free lower side 8B which is not fixed. The pollution prevention sheet 8 having the above configuration is suspended between the soil carrier 3 and the pollution prevention frame 2 by hanging the lower side 8B into the pollution prevention frame 2.

  The wire rod 10 is connected to the weight member 81. One end of the wire 10 is fixed to the support 9 on the one edge 32 of the soil carrier 3. Therefore, the pollution prevention sheet 8 can be lifted by lifting the wire rod 10.

  As shown in FIG. 4A, the pollution prevention sheet 8 may be arranged on the one side edge portion 32 in a state of being stored by being rolled into a roll shape or the like before the soil ship 3 and the pollution prevention frame 2 are connected. . Of course, when the work is not performed, the pollution prevention sheet 8 is removed from the one side edge portion 32 and stored in a separately prepared storage box or the like, and at the time of the work, the pollution prevention sheet 8 is placed on the one side edge portion 32 as described above. You may install it.

  Then, as shown in FIG. 4B, when the soil ship 3 and the pollution prevention frame 2 are connected by the attracting device 7, the lower side 8B of the pollution prevention sheet 8 hangs down inside the pollution prevention frame 2 to prevent the pollution prevention sheet. 8 is bridged between the soil carrier 3 and the pollution control frame 2. It should be noted that arrows G1 and G2 shown in FIG. 4B indicate movement lines of the grab bucket 61. That is, the pollution prevention sheet 8 is arranged at a position directly below the line of movement of the grab bucket 61 that holds the dredged soil.

  Therefore, the pollution prevention sheet 8 can catch fallen objects and return them to the pollution prevention frame 2 even if earth and sand or muddy water is dropped while the grab bucket 61 is moving on the movement line. Therefore, the pollution prevention sheet 8 can prevent falling objects from riding on the float 21 of the pollution prevention frame 2 and later falling into the surrounding water area to pollute the surrounding water area.

  As described above, since the pollution prevention structure for dredging work of the present embodiment is configured to connect the pollution prevention frame 2 and the soil ship 3 by the magnetic force of the attracting device 7 provided in the pollution prevention frame 2, The pulling function and the pollution prevention function can be reliably demonstrated. Since the attracting device 7 is small and is only installed on the float body 21 of the pollution prevention frame 2, it is not a large-scale device and is economical.

  The pollution prevention structure for dredging work of the present embodiment is configured to include the pollution prevention sheet 8 that hangs from the one side edge portion 32 of the earth transportation ship 3 into the pollution prevention frame 2. Therefore, in the connection between the pollution prevention frame 2 and the soil carrier 3 by the attracting device 7, even if there is a gap between the pollution prevention frame 2 and the soil carrier 3, the pollution prevention sheet 8 covers the gap. be able to. Then, even if earth and sand or muddy water is 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 pollution prevention frame 2. It can be surely prevented that water drops and pollution occurs.

  Further, the pollution prevention structure for dredging work according to the present embodiment has a very simple structure in which the attracting device 7 is installed on the pollution prevention frame 2 and the pollution prevention sheet 8 is arranged on the earth carrier 3 for general purpose. It is highly likely. In addition, since the attracting device 7 and the pollution prevention sheet 8 are relatively inexpensive, the two sides (the arrow X1 of the float body 21 where the attracting device 7 may be brought into contact with the soil carrier 3). Side and the X2 side), and the pollution prevention sheet 8 can be positively installed on both sides (on both end edges) of the earthmoving ship 3. Then, regardless of whether the soil carrier 3 is ported to the left or right of the dredger 1 (arrow X1 side or X2 side), the effect of the present embodiment can be expected, and the operation management of the soil carrier 3 becomes easy.

<Construction procedure>
Next, the procedure for constructing the pollution prevention structure for dredging work according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 shows a process until the pollution prevention frame 2 and the earthmoving ship 3 are connected by the drawing device 7.

  First, as shown in FIG. 5A, the earthmoving ship 3 is guided to the location of the dredger 1 by the auxiliary ship 100. At this time, the pollution prevention sheet 8 is installed in a state of being stored on the one side edge portion 32 of the earthmoving ship 3. In addition, a push boat or the like may be used to guide the earth transporter 3 and the dredging boat 1.

  As shown in FIG. 5B, when the earthmoving ship 3 docks on the right side of the dredging ship 1 (arrow X1 side), the earthing ship 3 is moored to the port side of the dredging ship 1 by ropes 5 and the like. The dredger 1 and the pollution control frame 2 are arranged side by side. At that time, the pollution prevention frame 2 is located on the bow side (arrow Y2 side) of the earthmoving ship 3.

  After that, the auxiliary ship 100 pushes the bow side of the ship 3 to bring the side surface 31 of the ship 3 on the bow side close to the attracting device 7 installed in the pollution prevention frame 2. At that time, the operation control section 762 of the remote control means 760 is operated to perform the sliding movement of the rod section 710 to the earth carrier 3 by the air spring device 770. Further, the operation control unit 762 is operated to turn on the magnetic force of the drawing device 7.

  The side surface 31 on the X2 side of the earthmoving ship 3 comes into contact with the caster portion 730 of the drawing device 7 due to the guiding force of the auxiliary ship 100 and the drawing force of the drawing device 7 (magnetic force and sliding movement of the rod part 710). To do. Then, the operation control unit 762 is operated to slide the rod portion 710 to the pollution prevention frame 2 side by the air spring device 770. Then, the side surface 31 of the earthmoving ship 3 is attracted and connected to the pollution prevention frame 2 by the magnetic force of the attracting device 7 and the sliding movement of the rod portion 710. Thereafter, as shown in FIG. 5C, the pollution prevention sheet 8 is spread, and the lower side 8B of the pollution prevention sheet 8 is hung in the pollution prevention frame 2 (see FIG. 4B).

  Next, with reference to FIG. 6, a process until the connection between the pollution prevention frame 2 and the soil carrier 3 is released will be described.

  First, as shown in FIG. 6A, the dredging vessel 1 performs the dredging work by the lifting machine 6 while the pollution prevention frame 2 and the soil transportation vessel 3 are connected by the drawing device 7. That is, the lifting machine 6 dredges the earth and sand in the pollution prevention frame 2 with the grab bucket 61. Then, the lifting machine 6 lifts the grab bucket 61 that holds the dredged soil, and then turns the main body 60 of the lifting machine 6 so that the grab bucket 61 is on the earth carrier 3, and opens the grab bucket 61. Put the earth and sand into the earth carrier 3. After that, the lifting machine 6 turns 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.

  During the dredging work, the gap between the pollution prevention frame 2 and the soil carrier 3 is completely eliminated by the connection of the pollution prevention sheet 8 and the pulling device 7 as described above, and therefore the soil and the muddy water are not present in the gap. It can be surely prevented from falling and causing pollution. Further, when the grab bucket 61 is moving on the movement lines G1-G2, even if earth and sand or muddy water is dropped, the pollution prevention sheet 8 receives the fallen objects and returns them to the inside of the pollution prevention frame 2. The risk of pollution can be prevented.

  When the dredging work is completed, the pollution prevention sheet 8 is first pulled up by the wire rod 10 as shown in FIG. 6B. After pulling up the pollution prevention sheet 8, the magnetic force of the drawing device 7 is turned off by the operation control unit 762. Then, the mooring of the rope 5 is released, and the moored state of the earth transporter 3 with the dredger 1 is released.

  Then, as shown in FIG. 6C, the earthmoving ship 3 departs from the dredging ship 1. After that, the pollution prevention sheet 8 is stored in a proper place.

[Second Embodiment]
Next, a pollution prevention structure and a drawing device for dredging work according to the second embodiment will be described with reference to FIGS. 7 and 8.

  The second embodiment has substantially the same technical idea as the first embodiment, and the differences will be mainly described below, and description of common matters will be omitted.

  FIG. 7 is a partially enlarged perspective view showing a state in which the pollution prevention structure for dredging work according to the second embodiment is implemented. Note that FIG. 7 shows a state in which the soil carrier 3 and the pollution prevention frame 2 are connected. FIG. 8 is a rear perspective view illustrating the configuration of a drawing device 7 ′ that constitutes the pollution prevention structure for dredging work according to the second embodiment. 7 and 8, the air hose 761 and the spring air hoses 771a and 772a are omitted for the sake of explanation.

  In this embodiment, the structure of the attracting device 7'is slightly different.

  The attracting device 7 of the first embodiment has a single-piece configuration in which one suction portion 700 is arranged with respect to the fixed plate 71. However, the attracting device 7'of this embodiment is configured such that the plurality of suction portions 700 'are arranged with respect to the fixed plate 71'. The structure of the suction unit 700 'is substantially the same as that of the suction unit 700 of the first embodiment. Except for the points described above, the second embodiment is the same as the first embodiment, and therefore the description of the common configuration will be omitted.

  In the attracting device 7 ′ of this embodiment, for example, five suction portions 700 ′ are arranged on the fixed plate 71. Therefore, as shown in FIG. 7, the attracting device 7'can reliably respond to the side surface 31 of the earthmoving ship 3 by the caster parts 730 'installed on the five suction parts 700'.

  In the attracting device 7'of the present embodiment, five suction parts 700 'are arranged, but the number is not limited to this, and can be changed as appropriate as long as it is three or more.

(Modification)
Further, the pulling devices 7 and 7'of the present embodiment have been described by taking the pollution prevention frame 2 as the main body and the earth carrier 3 as the connected part as an example, but the present invention is not limited to this. The pulling device that pulls and connects the other main body portion and the other connected portion can be similarly implemented. For example, it can be applied to the case where a work boat is berthed to the quay, and caisson installation work. At that time, pulling devices will be installed on the quay side and the installed caisson side. A caisson having a steel structure (hybrid caisson) on the outer wall is desirable as the caisson for disposing the attracting device.

  At that time, whether or not to have the pollution prevention sheet can be appropriately changed depending on the implementation situation.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

1 Dredger 2 Pollution Prevention Frame 21 Float 21R Side (right side of float)
21L side (left side of float body)
22 Contamination prevention film 3 Earth transport ship 31 Side surface 32 One side edge 4, 5 Rope 6 Lifter 60 Main body 61 Grab bucket 62 Boom 7 Pulling device 71 Fixing plate 71a Through hole 700 Adsorption part 710 Rod part 711 Shaft part 712 Connection Part 720 Connection plate 730 Caster part 731 Support part 732 Roller part 732a Shaft pin 740 Magnetic force generating part 741 Magnet 750 Movable plate 751 Through hole 752 Fixed part 760 Remote operation means 761 Air hose 762 Operation control part 770 Air spring device 771 First air spring Part 771a First spring air hose 772 Second air spring part 772a Second spring air hose 8 Pollution prevention sheet 8A Upper side 8B Lower side 81 Weight 9 Support 10 Wire 100 Auxiliary ship

Claims (16)

A structure for preventing pollution of dredging work constructed using a pollution prevention frame arranged in front of the dredging ship and an earth carrier carrying dredged sand,
The pollution prevention frame is provided with a pulling device that is attracted to the port side of the soil transportation ship by magnetic force to connect the pollution prevention frame and the soil transportation ship,
The attracting device is
A fixed plate fixed in a manner of standing upright in the vertical direction with respect to the pollution prevention frame, and a suction unit provided on the fixed plate and movable in the horizontal direction,
The adsorption unit,
A rod part that is inserted into a through hole provided in the fixed plate and that is movable in the horizontal direction, and a connecting plate that is connected to the tip of the rod part and that is movable in accordance with the horizontal movement of the rod part. And three or more caster portions provided on the outer peripheral surface of the connecting plate on the side of the earth transporting ship and contacting the earth transporting ship, and provided on the outer peripheral surface of the connecting plate on the side of the earth transporting ship, A magnetic force generating section equipped with a magnet having a height lower than that of the caster section;
A pollution prevention structure for dredging work, characterized by having. The attracting device is
The pollution prevention structure for dredging work according to claim 1, further comprising remote operation means capable of remotely switching on and off of the magnetic force in the magnetic force generator. The remote control means is
It has an air hose connected with the magnetic force generation part and which inverts the N pole and the S pole of the magnet by compressed air, and an operation control part which is connected to the air hose and controls the supply of the compressed air. Item 2. A pollution control structure for dredging work according to item 2. The attracting device is
The pollution prevention structure for dredging work according to claim 1, further comprising an air spring device that moves the rod portion in a horizontal direction. The attracting device is
The movable plate is disposed on the side opposite to the connecting plate of the fixed plate, and has a movable plate through which the rod portion movable according to the horizontal movement of the rod portion is inserted.
The air spring device is
A first air spring portion arranged between the fixed plate and the connecting plate;
A second air spring portion arranged between the fixed plate and the movable plate;
A first spring air hose for supplying / exhausting air to / from the first air spring portion; and a second spring air hose for supplying / exhausting air to / from the second air spring portion, The pollution prevention structure for dredging work according to claim 4. The rod portion is
The pollution prevention structure for dredging work according to claim 3, wherein the air hose has a hollow portion, and the air hose is disposed in the hollow portion. The attracting device is
The pollution prevention structure for dredging work according to any one of claims 1 to 6, wherein a plurality of the suction portions are arranged with respect to the fixed plate. The earth carrier has
The pollution prevention sheet for dredging work according to claim 1, wherein an upper side is fixed to one side edge of the soil carrier, and a lower side is provided with a pollution prevention sheet that hangs down into the pollution prevention frame. Construction. A weight member is attached to the lower side of the pollution prevention sheet,
The pollution prevention structure for dredging work according to claim 8, wherein a wire whose one side end is fixed to the one side edge of the earthmoving ship is connected to the weight member. A pulling device for pulling and connecting a connected portion to a main body,
A suction plate capable of moving in the horizontal direction is provided on a fixed plate fixed in a manner to stand in the vertical direction with respect to the main body,
The adsorption unit,
A rod part that is inserted into a through hole provided in the fixed plate and that is movable in the horizontal direction, and a connecting plate that is connected to the tip of the rod part and that is movable in accordance with the horizontal movement of the rod part. When provided on the outer peripheral surface of the object side of the connecting portion of the connecting plate, and provided the and three or more caster portion that contacts with the connected portion, an outer peripheral surface of the object side of the connecting portion of the connecting plate And a magnetic force generating portion having a magnet having a height lower than that of the caster portion,
And a pulling device. The attracting device is
11. The pulling device according to claim 10, further comprising remote operation means capable of switching on and off of the magnetic force in the magnetic force generation section by remote operation. The remote control means is
It has an air hose connected with the magnetic force generation part and which inverts the N pole and the S pole of the magnet by compressed air, and an operation control part which is connected to the air hose and controls the supply of the compressed air. Item 12. The attracting device according to item 11. The attracting device is
The pulling device according to claim 10, further comprising an air spring device that moves the rod portion in a horizontal direction. The attracting device is
The movable plate is disposed on the side opposite to the connecting plate of the fixed plate, and has a movable plate through which the rod portion movable according to the horizontal movement of the rod portion is inserted.
The air spring device is
A first air spring portion arranged between the fixed plate and the connecting plate;
A second air spring portion arranged between the fixed plate and the movable plate;
It has a first spring air hose that supplies and exhausts air to and from the first air spring portion, and a second spring air hose that supplies and exhausts air to and from the second air spring portion. The attracting device according to claim 13. The rod portion is
The attracting device according to claim 12, wherein the attracting device has a hollow portion, and the air hose is disposed in the hollow portion. The attracting device is
The attracting device according to any one of claims 10 to 15, wherein a plurality of the suction portions are arranged with respect to the fixed plate.

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