JP6674672B2 - Apparatus and method for suppressing pollution diffusion of pump dredger - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a pollution control device and a pollution control method for a pump dredger for controlling pollution generated during excavation by a cutter head in pump dredging.

  BACKGROUND ART Conventionally, as a method of dredging a water bottom of a port or the like, a dredging method using a pump dredger is known (for example, see Patent Document 1).

  As shown in FIGS. 8 and 9, the pump dredge 1 includes a rudder 3 inserted into the water from the dredge main body 2 with the tip side toward the water bottom A, and a turning means 4 for turning the rudder 3 together with the dredge main body 2. , A cutter head 5 disposed at the tip of the ladder 3, a transport pipe 6 having a suction port 6a opened at the tip of the ladder 3, and a suction pump 7 connected to the transport pipe 6. In the figure, reference numeral 8 denotes a spat, and reference numeral 9 denotes an elevating means for moving the ladder up and down.

  The dredging work by the pump dredger 1 is performed by driving the spat 8 into the water bottom A, and turning the rudder 3 together with the dredger main body 2 by the turning means 4 around the spat 8 while rotating the rudder 3 with the cutter head 5 at the tip of the rudder. The operation of excavating earth and sand, sucking the excavated earth and sand together with the surrounding seawater through the transport pipeline 6 by the suction pump 7, and directly transferring the excavated earth to a dumping site or the like by pumping is repeated every time the pump dredger moves. .

  In the figure, reference numeral 4a denotes a turning wire constituting the turning means 4, and a spat is formed by feeding and winding the turning wires 4a, 4a with respective winches (not shown) provided at the bow. The rudder 3 is turned (swinged) in the horizontal direction together with the dredger body 2 around the fulcrum 8.

  However, in such a dredging operation by a pump dredger, there is a problem that, with the excavation and turning by the cutter head, a pollutant factor composed of small-particle clay or the like floats and becomes polluted and diffuses around. In view of the environment, it is preferable to suppress such diffusion of the pollution.

  Therefore, conventionally, a hood that covers the outer peripheral side of the cutter head, a sludge suction pipe that communicates the inside of the hood with the transport pipeline, and an auxiliary suction pump connected to the sludge suction pipe are provided. A pollutant diffusion suppressing device has been developed in which the pollutant is retained in the inside and sucked through a sludge suction pipe to suppress the diffusion of the pollutant (for example, see Patent Document 1).

  In addition, this pollution diffusion suppression device has a movable opening which can be opened and closed via a hinge on the side of the hood in the turning direction, and by opening the movable opening in the front in the turning direction, the hood does not hinder the excavation by the cutter head. I have to.

JP-A-51-39937

  However, in the above-described conventional techniques, there is a problem that the work of attaching a heavy hood to the ladder requires labor and labor, and the construction period and cost increase.

  In addition, in the case where a movable opening that can be opened and closed via a hinge is provided on the side of the hood in the turning direction, there has been a problem that the structure is easily broken down and maintenance is complicated.

  Furthermore, since the pollution suction pipe is connected to a hood that covers the outer periphery of the cutter head and does not directly suck the location where the pollution occurs, there is another problem that the suction efficiency of the pollution is low.

  Accordingly, the present invention has been made in view of such conventional problems, and has as its object to provide a pollution diffusion suppression device and a pollution diffusion suppression method for a pump dredger capable of suitably suppressing the diffusion of pollution during pump dredging with a simple structure. It was done.

The feature of the invention according to claim 1 for solving the conventional problem as described above is that a rudder inserted into water with the tip side facing the water bottom, turning means for turning the rudder, and a rudder tip A cutter head rotatably disposed in a section, a transport pipe having a suction port opened at the ladder tip, and a suction pump connected to the transport pipe. In a pollution diffusion suppression device for a pump dredge for suppressing the diffusion of pollution generated at the time of excavation by a head, a pollution suction port disposed on the tip side of the cutter head, A pollution suction pipe to be tied, and a flexible pollution receiving film supported by the pollution suction port via a frame supporting frame and disposed on a tip end side of the cutter head ; Opposite side of turning direction In the pollution diffusion suppressing device of the pump dredger arranged behind the pollution suction port in the turning direction.

  A feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, an auxiliary suction pump connected to the pollution suction pipe is provided.

  A feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the connection part of the pollution suction pipe with the transport pipeline or the discharge port of the auxiliary suction pump is configured by a jet nozzle. It is in.

The feature of the invention according to claim 4 is that a ladder inserted into the water with the tip side facing the water bottom, a cutter head rotatably arranged at the ladder tip, and a suction port at the ladder tip. In a method for suppressing the diffusion of pollutants generated during excavation during a dredging operation using a pump dredge equipped with an opened transport pipeline and a suction pump connected to the transport pipeline, the pump dredger includes: A polluting suction port disposed on the tip side of the cutter head, a polluting suction pipe connecting the polluting suction port and the transport conduit, and supported by the polluting suction port via a frame supporting frame. A flexible contamination receiving film disposed on the tip end side of the cutter head, and, while rotating the ladder, flexes in a direction opposite to the rotating direction, thereby turning the ladder backward from the contamination suction port. Placed in Scraped little pollution factor particle size suspended in the polluted receiving layer are, is it the pollution diffusion suppression method pump dredger which sucks in the pipeline through the polluted suction pipe from the polluted suction mouth.

As described above, the pollution control device of the pump dredger according to the present invention has a rudder inserted into the water with the tip side directed toward the bottom of the water, turning means for turning the rudder, and rotatable to the rudder tip. A pump head provided with a cutter head, a transport pipeline having a suction port opened at the ladder tip, and a suction pump connected to the transport pipeline, when drilling by the cutter head. In a pollution diffusion suppression device of a pump dredge for suppressing the spread of generated pollution, a pollution suction port disposed on a tip side of the cutter head, and a pollution suction pipe connecting the pollution suction port and the transport pipeline. And a flexible pollution receiving film supported on the pollution suction port via a frame supporting frame and disposed on the tip side of the cutter head, wherein the pollution receiving film is opposite to the turning direction. Beside See, by being arranged in the turning direction behind the said pollution suction mouth, the pollution caused by the excavation by the cutter heads with a simple structure efficiently sucked, it is possible to suppress the diffusion of contamination.

  Further, in the present invention, the provision of the auxiliary suction pump connected to the pollution suction pipe enables efficient suction of the pollution.

  Further, in the present invention, the connection part of the pollution suction pipe with the transport pipeline or the discharge port of the auxiliary suction pump is constituted by a jet nozzle, so that the suction at the time of pollution suction is performed by the suction pump to suck the excavated soil. Can be used for assisting the operation, the apparatus can be simplified, and an efficient dredging operation can be performed.

In the method for suppressing pollution diffusion of a pump dredger according to the present invention, a ladder inserted into water with its tip side facing the water bottom, a cutter head rotatably arranged at the ladder tip, and suction at the ladder tip. In a method for suppressing pollution diffusion during excavation during a dredging operation using a pump dredge equipped with a transport pipe having an open mouth and a suction pump connected to the transport pipe, the pump includes In the dredger, a pollution suction port disposed on the tip side of the cutter head, a pollution suction pipe connecting the pollution suction port to the transport pipe, and a membrane supporting frame provided on the pollution suction port. supported Te, and a pollutant receiving film having flexibility is disposed distally of the cutter head, while turning the rudder, the deflection on the opposite side turning direction with it, turning from the polluted suction mouth The scraping factor having a small particle diameter floating in the pollution receiving membrane disposed at the back and forth is raked up, and the polluting factor is sucked into the transport conduit through the pollution suction pipe from the pollution suction port to thereby remove the floating particles. Since small pollutants are collected and sucked, the diffusion of the pollutants can be suppressed.

It is a side view which shows the use aspect of the pollution diffusion suppression apparatus of the pump dredger which concerns on this invention. It is a top view same as the above. (A) is an enlarged side view showing an example of the contamination suction port in FIG. 1, and (b) is a bottom view of the same. It is a front view showing the relation between the turning direction and the rotation direction of the cutter head, where (a) is a diagram showing an overcut and (b) is a diagram showing an undercut. It is a partial enlarged side view which shows the state at the time of contamination suction. It is a partial enlarged plan view of the same. It is a side view which shows another example of the pollution diffusion suppression apparatus of the pump dredger which concerns on this invention. It is a side view which shows an example of the conventional pump dredger. It is a top view same as the above.

  Next, an embodiment of a pollution diffusion suppressing device for a pump dredge according to the present invention will be described based on the embodiment shown in FIGS. Note that the same components as those in the above-described conventional example are denoted by the same reference numerals, and reference numeral A denotes a water bottom, reference numeral B denotes a water surface, and reference numeral 1 denotes a pump dredger.

  The pump dredge 1 is similar to the conventional example shown in FIGS. 8 and 9, in which the rudder 3 is inserted into the water from the dredge main body 2 toward the water bottom A, and the rudder 3 is swiveled together with the dredge main body 2. Means 4, a cutter head 5 arranged at the tip of the ladder 3, a transport pipe 6 having a suction port 6a opened at the tip of the ladder 3, and a suction pump 7 connected to the transport pipe 6; While rotating the rudder 3 together with the dredger main body 2, excavation of soil at the bottom of the water is performed by the cutter head 5 at the tip of the rudder 3, and the excavated soil is sucked up along with the surrounding seawater through the transport conduit 6 by the suction pump 7, and dumped by pumping. The operation of transferring directly to the site is repeated every time the pump dredger 1 moves.

  Further, the pump dredger 1 is provided with a pollution diffusion suppressing device 20 so that a dredging operation can be performed while suppressing the diffusion of pollution generated during excavation by the cutter head 5.

  The cutter head 5 is rotatably supported by the tip of the rudder 3 and is configured to excavate earth and sand at the water bottom A by being rotated by a drive motor (not shown).

  Here, regarding the rotation direction of the cutter head 5 and the turning direction of the rudder 3, for example, as shown in FIG. When biting, the method of digging by turning the rudder 3 clockwise is called overcut, and as shown in FIG. 4B, turning the rudder 3 counterclockwise while the rotation of the cutter head 5 remains clockwise. The method of digging is called undercut.

  The pollution diffusion suppression device 20 includes a pollution suction port 21 disposed on the tip side of the cutter head 5, a pollution suction pipe 22 connecting the pollution suction port 21 and the transport line 6, and a film on the pollution suction port 21. And a flexible pollution receiving film 24 supported via a supporting frame 23.

  Further, the pollution diffusion suppressing device 20 includes an auxiliary suction pump 25 connected to the pollution suction pipe 22, and transfers the polluting factor sucked through the pollution suction port 21 and the pollution suction pipe 22 to the transport line 6 by pumping. I can do it.

  The pollution suction pipe 22 is formed of a pipe having a certain rigidity, such as a steel pipe or a stainless steel pipe, and includes a straight support pipe portion 22 a fixed to the upper surface of the ladder 3 via a support fixture 26.

  The straight support tube portion 22a is disposed over the cutter head 5 so that the pollution suction port 21 extends downward from the tip thereof, and the pollution suction port 21 is disposed on the tip side of the cutter head 5. Has become.

  The base end of the straight support pipe portion 22a is connected to the suction port of the auxiliary suction pump 25, and the discharge port of the auxiliary suction pump 25 is connected to the transport pipe 6 through the connection pipe 22b constituting the pollution suction pipe 22. I have.

  The polluting suction port portion 21 is formed in a tubular shape with the suction port 21a facing downward, and the suction port 21a at the lower end is located near the center of the tip of the cutter head 5 and slightly above the undigged water bottom at the tip side of the cutter head 5. It is arranged to be located.

  As shown in FIG. 3, the membrane supporting frame 23 is composed of a pair of L-shaped steel materials, and both L-shaped steel materials are supported by a fixing metal 23a fixed to the lower end of the pollution suction port 21 to form a gate shape. No.

  On the membrane supporting frame 23, both membrane supporting portions 23b, 23b facing upward and downward are arranged in parallel at intervals in the turning radial direction, and each membrane supporting portion 23b, 23b has an end portion of the contamination receiving film 24. Is fixed.

  The pollution receiving film 24 is formed of a flexible and water-impermeable thin plate material such as a rubber plate, and both ends thereof are fixed to the membrane support portions 23b of the membrane support frame 23, respectively. Between 23b, it bends to the opposite side to the turning direction, and is held in a state of being disposed behind the polluting suction port 21 in the turning direction.

  The position of the pollution suction port 21 and the pollution receiving film 24 is set such that the lower end of the pollution suction port 21 and the upper end of the pollution receiving film 24 are substantially at the same height. The polluting factor consisting of fine clay particles and the like that have accumulated on the front side in the turning direction of the pollution receiving film 24 from the suction port 21a that has been sucked can be sucked together with the surrounding water, and when the turning direction is switched, The bending direction is switched by the accompanying water pressure.

  The position of the pollution receiving film 24 is adjusted so that the lower edge thereof does not come into contact with the upper surface of the undigged ground when the rudder 3 turns.

  Next, a method for suppressing pollution diffusion of pump dredging using the present apparatus will be described. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  First, the work boat main body 2 is moved to the area to be dredged, and the spat 8 is driven into the water bottom A at that position, the elevating means 9 is operated to lower the tip of the rudder 3, and the cutter head 5 at the tip of the rudder 3 is moved. Let it land.

  Then, the cutter head 5, the suction pump 7, and the auxiliary suction pump 25 are operated, and the turning operation of the work boat 2 is started. Is excavated, and the excavated earth and sand is sucked up by the suction pump 7 through the transport pipeline 6 together with the surrounding seawater, and the operation of directly transferring the excavated soil to the dumping site by pumping is repeated every time the pump dredger 1 moves.

  At this time, when the ladder 3 turns rightward when the overcut, that is, when the cutter head 5 rotates clockwise, as shown in FIG. Since the excavation is performed from the shallow part, the sediment generated on the tip side of the cutter head 5 rises and becomes polluted.

  At this time, as shown in FIG. 6, the main contaminants 30a are sucked into the transport pipeline 6 by the suction pump 7 from the suction port 6a through the cutting blades of the cutter head 5 together with the excavated earth and sand. The contaminant 30b that is not sucked is moved to the tip side of the cutter head 5 in a floating state.

  On the other hand, the pollution diffusion suppressing device 20 according to the present invention has a pollution suction port 21 on the tip end side of the cutter head 5 and a flexible pollution supported on the pollution suction port 21 via a membrane supporting frame 23. Since the contamination factor 30b is provided with the receiving film 24, the contamination factor 30b that has been moved to the tip side of the cutter head 5 without being sucked by the suction pump 7 bends in the opposite direction to the turning direction as shown in FIGS. The trapping surface of the pollution receiving film 24 disposed behind the contamination suction port 21 in the turning direction is captured and raked, and the sediment component having large particles on the front side in the turning direction of the pollution receiving film 24 is settled by its weight. However, only pollutants such as small sand particles are suspended and stay.

  Then, only the small pollutant factors of the particles which are suspended and stay on the front side in the swirling direction of the pollution receiving film 24 are sucked together with the surrounding water from the pollution suction port 21 a and transferred to the transport line 6 through the pollution suction pipe 22. You.

  Therefore, the pollution caused by the excavation of the cutter head 5 is not diffused behind the pollution receiving film 24 in the rotation direction, and the pollution can be suppressed.

  On the other hand, when the rudder 3 turns in the opposite direction to the overcut, that is, switches to the undercut, the bending direction of the pollution receiving film 24 is switched by the water pressure due to the turning, and the pollution receiving film 24 is bent in the opposite direction to the turning direction. Also, the polluting factor 30b moved to the tip side of the cutter head 5 without being sucked into the transport pipeline 6 by the suction pump 7 is contaminated by the polluting suction port 21 and the polluting suction as in the case of overcut. The contamination factor can be sucked through the tube 22.

  In the case of undercut, as shown in FIG. 4 (b), the excavation blade of the cutter head 5 approaches the unexcavated portion from below and excavates from the deep portion of the unexcavated portion. The soil and sand are hardly lifted up by being held down, and the contamination factor 30b, which has been moved to the tip side of the cutter head 5 without being sucked by the suction pump 7 as described above, is also reliably sucked, so that the diffusion of the soil can be suppressed.

  In the above-described embodiment, the example in which the auxiliary suction pump 25 is connected to the contamination suction pipe 22 has been described. However, as shown in FIG. 7, the contamination suction pipe 22 is directly transported without the auxiliary suction pump 25. You may make it connect to the road 6. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  In this case, even if the suction force of the auxiliary suction pump 25 does not act, the negative pressure generated in the transport conduit 6 by the suction pump 7 also acts on the connected pollution suction pipe 22, so that the pollution suction port 21 and the pollution suction are performed. The contamination factor can be sucked through the tube 22.

  Further, in the pollution diffusion suppressing device 20 according to the present invention, the connection portion of the pollution suction pipe 22 with the transport line 6 or the discharge port of the auxiliary suction pump 25 may be constituted by a jet nozzle.

A Water bottom 1 Pump dredge 2 Dredge main body 3 Rudder 4 Swivel means 5 Cutter head 6 Transport pipeline 7 Suction pump 8 Spat 9 Elevating means 20 Pollution diffusion suppression device 21 Pollution suction port 22 Pollution suction pipe 23 Film support frame 24 Pollution receiver Membrane 25 Auxiliary suction pump 26 Support fixture

Claims (4)

A ladder inserted into the water with the tip side facing the water bottom, a turning means for turning the ladder, a cutter head rotatably arranged at the ladder tip, and a suction port opened at the ladder tip. Transport pipe and a pump dredge equipped with a suction pump connected to the transport pipe, in a pollution control device of a pump dredge for suppressing the diffusion of pollution generated during excavation by the cutter head,
A pollution suction port arranged on the tip side of the cutter head, a pollution suction pipe connecting the pollution suction port with the transport conduit, and supported via a membrane supporting frame at the pollution suction port ; A flexible pollution receiving film disposed on the tip side of the cutter head ,
A pollution diffusion suppressing device for a pump dredger, wherein the pollution receiving film is bent in a direction opposite to a turning direction and is disposed behind the pollution suction port in the turning direction.   The pollution diffusion suppression device for a pump dredger according to claim 1, further comprising an auxiliary suction pump connected to the pollution suction pipe.   The pollution diffusion suppression device for a pump dredger according to claim 1 or 2, wherein a connection portion of the pollution suction pipe with the transport pipeline or a discharge port of the auxiliary suction pump is configured by a jet nozzle. A ladder to be inserted into water with the tip side facing the water bottom, a cutter head rotatably arranged at the tip of the ladder, a transport pipe having a suction port opened at the tip of the ladder, and the transport pipe At the time of dredging work using a pump dredge equipped with a suction pump connected to a road, in a pollution diffusion suppression method for suppressing the spread of pollution generated during excavation,
The pump dredge includes a pollution suction port disposed on the tip side of the cutter head, a pollution suction pipe connecting the pollution suction port to the transport conduit, and a membrane supporting frame provided on the pollution suction port. And a flexible pollution receiving film disposed on the distal end side of the cutter head .
While turning the ladder, it flexes in the opposite direction to the turning direction with it, and collects a small pollutant with a small particle diameter floating in the pollution receiving film disposed behind the polluting suction port in the turning direction. A method for suppressing pollution diffusion of a pump dredging vessel, wherein suction is performed from a pollution suction port to the transport conduit through the pollution suction pipe.

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