JP3143948U - 浚 渫 Work pollution prevention device - Google Patents

Abstract

An object of the present invention is to provide an anti-pollution device for dredging work which prevents contamination of the water surface due to pollution around the dredging work area when dredging sediment and mud on the bottom of a water with a work ship such as a grab dredger.
A dredging work pollution prevention device is provided with a water surface pollution prevention plate on an upper surface of a part of at least one side in contact with a framed ship. The water surface contamination prevention plate has an inclination. As a result, the sludge discharged when the clamshell is lifted and transported to the earth ship is brought into contact with the water surface pollution prevention plate, and the pollution is returned to the frame along the inclination. Moreover, this water surface pollution prevention board is supported by the frame in the movable state via the elastic body. For this reason, it is possible to prevent damage to the water surface contamination prevention plate due to the collision of the ship.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a dredging work pollution prevention device for preventing contamination of a water surface due to contamination around a dredging work area when dredging sediment and mud on the bottom of a water with a work ship such as a grab dredger.

As in Patent Document 1, a conventional anti-pollution device for dredging work includes a steel pipe frame and an anti-pollution device for dredging work that has a pollution prevention curtain that is attached so as to go around the frame and hangs down in water. . When dredging with a grab-type dredger, cover the clam shell that grabs the bottom sediment with a pollution prevention curtain that hangs down in the water to prevent the pollution generated by dredging from flowing out to the surroundings. Yes.
JP 2004-68268 A

However, in the pollution control apparatus for dredging work constructed as described above, when the clam shell that has grabbed the bottom sediment is lifted and the bottom sediment is transported to the earth carrier, the water surface is contaminated by the sludge discharged from the clam shell. For this reason, there arises a problem that the environment around the dredging work area is adversely affected.
Therefore, an object of the present invention is to provide a pollution control device for dredging work that prevents contamination of the water surface by sludge around the dredging work area during dredging work.

The invention according to claim 1 is a rectangular frame in plan view that is floated on the surface of the water, a pollution prevention curtain that is attached so as to circulate around the frame, and is suspended in water, and an earth ship of this frame. An anti-pollution device for dredging work having a water surface contamination prevention plate attached to the upper surface of at least one side in contact with the water surface contamination prevention plate. This is a dredging work pollution control device that is provided so as to be inclined so that the height from the water surface decreases from the outside of the frame toward the inside of the frame.
The part of one side refers to the part where the clamshell passes when the clamshell is lifted and moved to the ship.
To go around the frame means to surround the frame with a pollution prevention curtain. That is, it means that the pollution prevention curtain is attached to the frame and the frame is surrounded.

  According to the first aspect of the present invention, the sludge discharged when the clam shell is lifted and the bottom sediment is transported to the soil carrier is dredged by the water pollution prevention plate. Returned to the inside. For this reason, contamination of the water surface due to contamination of the dredging work area can be prevented.

The invention according to claim 2 is the pollution control device for dredging work according to claim 1, wherein the water surface contamination prevention plate is supported by the frame in a movable state via an elastic body.
The elastic body is a member having a particularly large elastic limit, for example, a rubber support or a spring.

  According to the second aspect of the present invention, even if the pollution prevention device for dredging work collides with an earth ship, the water surface pollution prevention plate can be moved, so that damage to the water surface pollution prevention plate can be prevented. .

According to the present invention, the sludge discharged when the clam shell is lifted and the bottom sediment is transported to the earth transport ship is returned to the inside of the pollution prevention device for dredging work by the water surface pollution prevention plate. . For this reason, contamination of the water surface by sludge in the dredging work area can be prevented.
Further, even when the pollution prevention device for dredging work collides with an earth ship, the water surface contamination prevention plate can be moved, so that damage to the water surface contamination prevention plate can be prevented.

Hereinafter, the pollution control apparatus 10 for dredging work of this invention is demonstrated in detail based on FIGS. 1-3.
In FIG. 1, the pollution control device 10 for dredging work includes a frame 11, a pollution prevention curtain 12 attached so as to go around the frame 11, a weight 15 provided at the lower end of the pollution prevention curtain 12, It has a water surface contamination prevention plate 14 attached to the upper surface of the frame and a winch 13 attached to the upper surface of the frame.

The frame 11 is configured to float on the water surface. The upper surface of the frame 11 floats above the water surface. The frame 11 is formed in a quadrangle in plan view. The frame 11 is formed of a steel pipe having a square cross section with a cavity. A plurality of floats having sufficient buoyancy as the entire frame 11 may be arranged at equal intervals. The frame 11 may be configured such that a plurality of pipes and the like are detachably connected. In this case, when not in use, the frame 11 can be disassembled and stored.
A curtain holding frame having the same shape as the frame 11 in plan view is fixed above the frame 11 via a plurality of vertical support bars. An upper frame to which the upper end of the pollution prevention curtain 12 is attached is welded to the curtain holding frame. The pollution prevention curtain 12 is supported by the upper frame so as to surround the frame 11.

The pollution prevention curtain 12 is composed of a plurality of rectangular cloths. A small through hole is formed at the upper end of the pollution prevention curtain 12 and is hooked on the upper frame through a rope. The vertical sides of the adjacent pollution prevention curtains 12 are sewn together. In this way, the pollution prevention curtain 12 is hooked on the entire frame.
Although this pollution prevention curtain 12 is formed with canvas, what is necessary is just the cloth material which does not permeate | transmit pollution.
The pollution prevention curtain 12 is hung only by the winch 13 during the dredging operation, and is wound up to the frame 11 when the dredging operation is not performed.
This pollution prevention curtain 12 is a film-like member that is provided to prevent the outflow of pollution generated by dredging by hanging underwater in a state of circling the outer periphery of the frame 11. Only when dredging work is performed, this pollution prevention curtain 12 hangs down to or near the bottom of the water and surrounds the clam shell 101 at the dredging position, and turbidity due to disturbance of the bottom sediment caused by dredging work is contained in the pollution prevention curtain 12. Confine and prevent spillage of surrounding pollution. For this reason, it becomes possible to prevent pollution around the dredging work area.

  The weight 15 is attached to the lower end of the pollution prevention curtain 12. The weight 15 has a role of pulling the pollution prevention curtain 12 downward in water. The weight 15 uses a chain when the anti-pollution curtain 12 needs to be flexible. Conversely, when the rigidity of the pollution prevention curtain 12 is required, a straight pipe or H-shaped steel is used instead of the chain.

The winch 13 is provided on the upper surface of the frame in order to raise and lower the pollution prevention curtain 12. A plurality of winches 13 are provided and arranged so that the pollution prevention curtain 12 can be supported and lifted down.
With this winch 13, a wire is attached to the pollution prevention curtain 12 so that the pollution prevention curtain 12 can be lifted and lowered. This wire is connected to the winch 13, and the wire is wound, whereby the pollution prevention curtain 12. Can be moved up and down.

The water surface contamination prevention plate 14 is formed of a rectangular flat plate (for example, wooden plywood) in plan view. The water surface contamination prevention plate 14 is attached to one side of the upper surface of the frame 11 that faces or contacts the ship 120. The water surface contamination prevention plate 14 is provided below the passage trajectory when the clam shell 101 is lifted from the water and rotated in the air to move above the earth ship 120.
That is, on the upper surface of the frame 11 at a lower position through which the clam shell passes, a U-shaped staple material 16a having a low height in parallel along the inner edge of the frame 11 is disposed along the outer edge of the frame 11. The shock absorbing members 16b each having a U-shaped configuration as a whole having a height higher than that of the first member are erected in parallel. More specifically, the shock absorbing member 16b is provided with two struts 16c having the same height along the outer peripheral edge standing on the upper surface of the frame 11 at a predetermined interval. Coil springs 17 are coaxially fixed to the upper ends of the columns 16c, and the upper ends of these coil springs 17 are fixed to the lower ends of the legs of the U-shaped staple 16d, respectively. As a result, the height of the horizontal portion of the staple 16d of the shock absorbing member 16b is higher than that of the staple material 16a parallel to the staple 16d.
The water surface contamination prevention plate 14 is attached to the staple material 16a and the staple 16d so as to be inclined and detachable as a whole toward the inner side of the frame 11. Specifically, a plurality of through holes are formed at predetermined positions on the water surface contamination prevention plate 14 which is a rectangular plate placed on the staple material 16a and the shock absorbing member 16b. ing. Two ropes or rubber strings having a predetermined length are respectively passed through these through holes, and these ropes or rubber strings are respectively connected to the staple material 16a and the staples 16d. That is, by connecting the ends of the ropes or rubber strings having intermediate portions inserted through the through-holes to the horizontal portion of the staple material 16a, another rope or rubber cord also inserted through the other through-holes is stapled 16d. The water surface contamination prevention plate 14 is connected to and held by the staple material 16a and the impact absorbing member 16b in an inclined state by being connected to the horizontal bar portion.
The water surface contamination prevention plate 14 is thus connected to the upper end of the column by a rope or a rubber string, and the coil spring 17 is disposed on the shock absorbing member 16b. Thus, it is provided so as to be rotatable within a predetermined angle range.
When the water surface contamination prevention plate 14 is mounted with an inclination, the inner edge protrudes from the frame 11 and the outer edge protrudes from the frame 11 by a predetermined length.
The water surface contamination prevention plate 14 is made of wood, but may be made of a plastic flat plate. The water surface contamination prevention plate 14 is preferably made of a light material. This is because, when the weight is heavy, the work of attaching the water surface contamination prevention plate 14 becomes dangerous. The attachment site and the number of attachments of the water pollution prevention plate 14 are arbitrary. It shall be attached to the frame 11 so as to cover at least the rotation range of the clamshell.

  A plurality of fenders (not shown) are provided on the outer edge of the frame 11. This fender is made of a material that absorbs shock caused by contact between the ship and the antifouling device for dredging work, such as waste tires. Damage can be prevented even if the ship and the pollution control device for dredging work come into contact with each other.

Anchors may be attached to the four corners of the frame 11. An anchor is a weight having a locking force that is connected to a chain or rope and sinks to the bottom of the water. The frame 11 can be positioned by attaching the anchor.
The external dimensions of the dredging work pollution control apparatus 10 are 20 to 50 m on a side. The outer dimensions of the water surface contamination prevention plate are 0.7 to 1.5 m in length, 1.5 to 3 m in width, and 1 to 5 cm in thickness.

The dredger 100 is a ship having a crane and a clamshell 101. The clamshell 101 is lifted and lowered by a crane.
The above-mentioned earth transport ship 120 is a ship that carries underwater sediment. Since the clay ship 120 cannot run on its own, the clay ship is moved by pushing a ship.

The dredging work using the pollution control apparatus 10 for dredging work having the above configuration will be described. In the dredging operation, the frame 11 is brought into contact with the tip of the dredger 100. Then, the frame 11 is brought into contact with the side of the clay ship 120. Then, the clam shell 101 is passed through the frame 11 and the bottom sediment of the bottom surface is dredged. After dredging, the clam shell 101 is pulled up and the bottom sediment is placed on the earth transport ship 120. The dredging work is performed according to these procedures.
A pollution prevention curtain 12 is stretched around the upper part of the frame 11, the frame 11 is floated on the water surface, and a pollution confinement region is formed by the pollution prevention curtain 12 below the frame 11. It is assumed that dredging work in which pollution occurs is performed within this frame. Contamination of the bottom sediment generated at the bottom of the dredging work diffuses into the water and gradually spreads. By blocking this and confining the pollution inside the pollution prevention curtain 12, the pollution of the water area outside this region Can be prevented.

  Further, when the clamshell 101 is lifted and transported to an earth ship, the sludge discharged from the clamshell 101 comes into contact with the water surface contamination prevention plate 14, and sludge is formed in the frame 11 due to the inclination of the water surface contamination prevention plate 14. Returned. Thereby, contamination of the water surface outside the work area can be prevented.

  In addition, when the earth ship 120 collides with the frame 11, the coil spring 17 extends and moves so that the inclination angle of the water surface contamination prevention plate 14 increases with the staple material 16a as an axis. Thus, the impact of the water surface contamination prevention plate 14 is transmitted to the coil spring 17, and the coil spring 17 absorbs the impact. Therefore, the water surface contamination prevention plate 14 can be used without being damaged.

It is a perspective view of the pollution prevention apparatus for dredging work in the embodiment of the present invention. It is a side view which shows the attachment structure of the water pollution prevention board in embodiment of this invention. (A) It is a figure which shows the dredging work by the grab type dredger using the pollution prevention apparatus for dredging work. (B) It is a top view which shows dredging work by the grab type dredger using the pollution prevention apparatus for dredging work.

Explanation of symbols

10 防止 Pollution prevention equipment for work,
11 frames,
12 Pollution prevention curtain,
14 Water pollution prevention board,
17 coil spring,
100 dredger,
120 An earth ship.

Claims (2)

A rectangular frame in plan view, floating on the surface of the water,
A pollution prevention curtain that is attached to circulate around this frame and hangs down in the water,
A pollution control device for dredging work having a water surface pollution prevention plate attached to the upper surface of a part of at least one side in contact with the framed ship,
This water surface contamination prevention plate is formed of a flat inclined plate, and its upper surface is inclined so that the height from the water surface decreases from the outside of the frame toward the inside of the frame. Prevention device.   The said water surface pollution prevention board is a pollution prevention apparatus for dredging work of Claim 1 currently supported by the said frame through the elastic body in the movable state.

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