JP5602297B1 - Ship carrier - Google Patents

Abstract

[PROBLEMS] To eliminate the pollution of the water area around the dredging caused by the spilled sand in the gap between the float frame and the side of the ship, and this effect can be achieved by moving the loading position of the mud in the mud. Provided is an earth ship that can be maintained even if the ship moves in the stern direction, and that the pollution prevention chute can be reduced in size and cost.
SOLUTION: At the end of one side of the deck 16, the length in the chute width direction is shorter than the length of the mud 20 in the fore-and-aft direction, and the gap between the float frame 11 and one side of the ship 10 The surrounding water area pollution prevention chute that receives the spilled sand from the grab bucket for moving toward the gap with one side of the ship, and slides it into the float frame. 22 was provided, and the deck was provided with moving means for moving the surrounding water area pollution prevention chute in the bow-stern direction in accordance with the situation of the earth and sand in the mud.
[Selection] Figure 1

Description

  In the present invention, when dredging soil (including bottom mud) with a grab dredger, the earth and sand spilled from the dredging grab bucket is dropped between the dredger and the dredging work pollution prevention device. The present invention relates to an earth ship equipped with a pollution prevention chute for preventing pollution around a flooded water area.

In recent years, when dredging with a dredger (grab dredger) equipped with a grab bucket for dredgers, excavation was performed by dividing the dredged area by a pollution control curtain suspended from a float frame made of a rectangular steel pipe in plan view. A pollution control device for dredging work has been developed to prevent pollution of surrounding water areas due to diffusion of earth and sand outside the flooded areas.
However, in the conventional anti-pollution device for dredging work, the earth and sand in the bucket spills on the upper surface of the float frame while turning the boom of the crane and transporting the bucket to the clay ship disclosed in Patent Document 1, for example. It fell between the float frame and the ship, and the area around the flooded area was polluted.

Therefore, as a conventional technique for solving this problem, for example, “Painting work pollution prevention device” of Patent Document 2 is known. This is a water surface pollution prevention plate (surrounding water area pollution prevention chute) in which the entire flat top surface is gradually inclined downward toward the inside of the float frame on the upper surface of at least one side in contact with the float boat of the float frame. Is fixed.
According to this, the earth and sand that spilled from the bucket toward the upper surface of the float frame while dropping the bucket to the ship, dropped on the water surface pollution prevention plate, and then slid down the inclined upper surface of the water surface pollution prevention plate. Return to the float frame. As a result, it is possible to prevent contamination of the surrounding water area between the float frame and the earth transport ship due to the spilled sand on the upper surface of the float frame.

JP 2013-169880 A Utility Model Registration No. 3143948

  However, in the “pollution prevention device for dredging work” of Patent Document 2, the water surface contamination prevention plate is fixed to the upper surface of a part of at least one side in contact with the float ship of the float frame in this way, so that the float frame can be removed from the bucket. The earth and sand that spilled toward the upper surface of the back was returned to the float frame. However, on waved water, even if the float frame is pressed against the side of the ship, a gap will appear between them. As a result, part of the earth and sand spilled from the bucket falls to the water surface around the float frame through the gap between the float frame and the dredge side, and the surrounding water area (the dredging area water area) surrounded by the dredging pollution control device. ) Was polluted.

Therefore, as a result of earnest research, the inventors have solved this problem if the surrounding water area pollution prevention chute is provided not on the float frame of the dredging work pollution prevention apparatus but on the deck of the ship. As a result, the present invention was completed.
By the way, in general, the loading position of mud in the mud of a ship is gradually increased from the bow side of the mud toward the stern side by moving the mud ship forward by a predetermined distance according to the progress of loading. Be changed. Therefore, in the case of an earth ship provided with a surrounding water area pollution prevention chute on the deck, it is conceivable to provide a long surrounding water area pollution prevention chute over the entire length of the mud to cope with the movement of the loading position of the earth and sand described above. However, this increases the size of the surrounding water pollution prevention chute, which increases the equipment cost of the ship.
Therefore, as a result of earnest research, the inventor has made the length of the stern of the surrounding water area pollution prevention chute shorter than the length of the stern of the mud, and the moving means according to the state of the earth and sand in the mud. As a result, it has been found that if the peripheral water pollution prevention chute can be moved in the bow-stern direction, all the above-mentioned problems will be solved, and the present invention has been completed.

  The present invention can eliminate the pollution of the water area around the dredging caused by the earth and sand spilled in the gap between the float frame and the dredging ship side, and this effect can be achieved by moving the loading position of the mud in the mud. Accordingly, an object of the present invention is to provide a clay ship that can be maintained even if the clay ship moves in the stern direction, and the pollution prevention chute can be reduced in size and cost.

According to the first aspect of the present invention, in the pollution prevention device for dredging work, the one side of the float frame is disposed on one side of the float frame by the pollution prevention curtain suspended from the rectangular float frame in plan view. A mud dredger that collects soil collected from the dredged area by a grab bucket for dredging of a grab type dredger is located at the end of one side of the deck in an earth ship provided in the center of the deck. , The length of the mud droop in the chute width direction is shorter than the length in the stern direction, and covers the gap between the float frame and one side of the clay ship in a bowl shape, thereby An upper surface of the grab bucket that receives the spilled sand toward the gap with the one side of the ship is provided with a surrounding water area pollution prevention chute that slides into the float frame. In Depending on the charged condition of the sand, the moving means for moving the waters surrounding pollution chute to stern direction provided, on an end portion of the mud艙側of the waters around Pollution chute spilled from the dredging glove bucket A mud throwing partial chute that slides a part of the earth and sand into the mud is formed, and the moving means includes a moving carriage attached to the upper part of the surrounding water area pollution prevention chute, and a tow wire, A traveling winch that pulls the moving carriage in the fore-and-aft direction, and the surrounding water area pollution prevention chute is arranged around the rotation axis with the length direction directed to the fore-and-aft direction. A first hand-wound type that is pivotally supported on the upper part and rotates around the rotation shaft by winding the wire to the use position in the state where the surrounding water area pollution prevention chute is turned down. With winch A hand-wound second winch that rotates the surrounding water area pollution prevention chute by winding another wire to the stowed storage position is disposed, and one deck side of the deck has a bow-tail direction When the surrounding water area pollution prevention chute is rotated to the retracted position, the end of the surrounding water area pollution prevention chute on the float frame side is pressed to stand up the surrounding water area pollution prevention chute This is an earth ship with a shoot standing guide plate .

According to the invention described in claim 1, the earth and sand spilled from the inside of the dredging grab bucket toward the gap between the float frame and one of the dredging ships while carrying the dredging grab bucket to the earth carrying ship, It falls on the bowl-shaped surrounding water pollution prevention chute, and then slides down the inclined upper surface of the surrounding water pollution prevention chute and returns to the float frame. Thereby, the pollution of the water area around the dredging caused by the earth and sand spilled in the gap between the float frame and the ship can be eliminated.
Further, the surrounding water area pollution prevention chute is moved in the fore-and-aft direction by the moving means according to the state of the earth and sand input in the mud. Thereby, the effect of eliminating the pollution in the water area around the dredging described above can be maintained even if the earth transport ship moves in the bow-stern direction with the movement of the loading position of the earth and sand in the mud. In addition, since the length in the chute width direction is shorter than the length of the mud in the stern direction, it is possible to reduce the size and cost of the surrounding water area pollution prevention chute.

Further, a mud throwing partial chute is formed at the mud side end of the surrounding water area pollution prevention chute to slide a part of the earth and sand spilled from the dredging grab bucket into the mud. As a result, a part of the earth and sand that spills from the grab bucket for dredging toward the gap between the float frame and one of the dredgers toward the dredging side of the dredging vessel, toward the mud side end of the surrounding water area pollution prevention chute The top surface of the charging partial chute is received and can be slid into the mud without returning to the float frame.
Furthermore, since the moving means having the moving carriage and the traveling winch for pulling the moving carriage with the pulling wire is adopted, the moving means can be manufactured at low cost and the maintenance is easy.
When retracting the surrounding water area pollution prevention chute, the second winch winds up another wire to rotate the surrounding water area pollution prevention chute until the end of the float frame side hits the chute standing guide plate. Rotate around the axis and raise the surrounding water pollution prevention chute at the end of one side of the deck. As a result, the surrounding water area pollution prevention chute does not get in the way when navigating the ship and berthing.

The form of the ship is arbitrary as long as the ship has mud for storing sediment (including mud) at the bottom of the water. For example, a system that opens and closes the ship bottom may be used. The ship can be self-propelled or towed. In order to bring one side of the ship closer to one side of the float frame, the float ship may be provided with a means for drawing the float frame. The pulling means may be a manual type (for example, a pulling rope and a hand-wound winch) or an automatic type (for example, a pulling rope and an electric winch).
Dredgers equipped with dredgers with dredging grab buckets dredge sediment collected on the bottom of the sea, riverbed or lake bottom using dredging grab buckets.
As the grab bucket for dredging, for example, a backhoe bucket attached to a backhoe arm may be used in addition to a clamshell bucket having a pair of shells to be opened and closed.

The dredging work pollution control device can be of any structure as long as the pollution control curtain is suspended from a rectangular float frame in plan view and can divide the flooded area.
The surrounding water area pollution prevention chute is a plate material having a flat upper surface for receiving earth and sand and gradually inclined downward toward the float frame. The lower end of the surrounding water area pollution prevention chute (the end on the float frame side) protrudes outward from the deck so as to cover the gap between the float frame and one side of the ship in a bowl shape. . The protrusion width varies depending on the width of one side of the rectangular float frame in plan view, but is, for example, 1 to 3 m.
As a material of the surrounding water area pollution prevention chute, for example, a metal such as iron or stainless steel can be employed.
The length in the width direction of the surrounding water area pollution prevention chute is not limited as long as it is shorter than the length of the mud bow in the stern direction. For example, it is 10 to 50% of the length of the mud in the stern direction.
The inclination angle of the surrounding water area pollution prevention chute is arbitrary, for example, 30 ° to 60 °.

The mud throwing partial chute is a plate material having a flat upper surface and gradually inclined downward toward the mud. For example, the same material as the surrounding water area pollution prevention chute can be integrally formed so as not to be separated.
The inclination angle of the mud throwing partial chute is arbitrary, for example, 15 ° to 45 °. It is preferable that the tip (lower end) of the mud throwing partial chute is arranged immediately above the mud of the clay ship because there is less spillage of the earth and sand to the deck.
The moving carriage here is a hand-drawn carriage that rolls on a rail that extends in the bow-stern direction and is provided on one side of the deck.
As the traveling winch, an electric winch that automatically winds the pulling wire can be employed.

As the chute rotating means, for example, a hand-wound winch or an electric winch can be employed. Further, an electric motor with a reduction gear may be used.
The chute rotating means also functions as an inclination angle changing means of the peripheral water area pollution prevention chute by rotating the peripheral water area pollution prevention chute around the rotation axis.
One or a plurality of rotating shafts may be used. In the case of a plurality of axes, each rotation axis must coincide with each other on a virtual straight line.

According to the invention described in claim 1, the earth and sand spilled from the inside of the bucket toward the gap between the float frame and one side of the ship in the middle of carrying the ship grab bucket to the ship It falls on the water pollution prevention chute, and then slides down the inclined upper surface and returns to the float frame. Thereby, the pollution of the water area around the dredging caused by the earth and sand spilled in the gap between the float frame and the ship can be eliminated.
In addition, the surrounding water area pollution prevention chute is moved in the fore-and-aft direction by the moving means according to the state of the earth and sand in the mud. Therefore, the effect of eliminating the pollution in the water area around the dredging described above can be maintained even if the earth transport ship moves in the fore-and-aft direction with the movement of the loading position of the earth and sand in the mud. In addition, since the length in the chute width direction is shorter than the length of the mud in the stern direction, it is possible to reduce the size and cost of the surrounding water area pollution prevention chute.

In addition, since a mud-injection partial chute was formed at the mud-side end of the surrounding water area pollution prevention chute, soil spilled from the dredging grab bucket toward the gap between the float frame and one side of the ship Among them, a part of the surrounding water area pollution prevention chute toward the mud side end is received by the upper surface of the mud throwing partial chute and can be slid down into the mud without returning to the float frame.
Furthermore, since the moving means having a moving carriage and a traveling winch that pulls the moving carriage with a pulling wire is adopted, the cost of the moving means can be reduced, and maintenance is easy.
In addition, when storing the surrounding water area pollution prevention chute, the rotation means rotates the surrounding water area pollution prevention chute around the rotation axis until the end of the float frame side presses against the chute standing guide plate, Stand up the surrounding water pollution prevention chute at the edge of one side of the deck. As a result, the surrounding water area pollution prevention chute does not get in the way when navigating the ship and berthing.

It is a principal part top view of the use condition of the earth transport ship which concerns on Example 1 of this invention. It is a principal part longitudinal cross-sectional view which shows the use condition of the earth transport ship which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view which shows the surrounding water area pollution prevention chute | shoot of the clay ship concerning Example 1 of this invention. It is a side view of the moving means except the peripheral water area pollution prevention chute of the earth-ship according to Example 1 of this invention. It is a principal part top view which shows the advancing state of the ship according to Example 1 of this invention, and the retreating state of a surrounding water area pollution prevention chute. It is a longitudinal cross-sectional view which shows the storage state of the surrounding water area pollution prevention chute | shoot of the clay ship which concerns on Example 1 of this invention.

  Examples of the present invention will be specifically described below. Here, an example is an example of an earth ship that is used for dredging work to remove sediment accumulated on the seabed of the gulf.

  1 and 2, reference numeral 10 denotes an earth ship according to Embodiment 1 of the present invention. The earth ship 10 is submerged by a pollution prevention curtain 12 suspended from a rectangular float frame 11 in plan view. In the dredging work pollution control device 13 for separating the dredging work, one dredging side is brought close to one side of the float frame 11, and the dredging grab bucket (hereinafter referred to as dredger) 14 dredging grab bucket (hereinafter referred to as bucket) 15 A mud 20 is provided in the center of the deck 16 to collect the earth and sand collected from the deck.

First, with reference to FIG. 1 and FIG. 2, the dredging work pollution control device 13 and the dredger 14 will be described in order.
The dredging work pollution prevention device 13 has a float frame 11 in which a square-shaped steel pipe having a cavity is connected to a square in plan view, and a pollution prevention curtain 12 provided around the lower part of the float frame 11. . The pollution prevention curtain 12 is obtained by sewing a plurality of quadrangular cloths (canvas) into a rectangular tube shape, and the upper end portion thereof is connected to the float frame 11 via a rope. The pollution prevention curtain 12 divides a flooded area from the seawater by being suspended in the seawater in a state of circling the outer periphery of the float frame 11.
The tugboat 14 is of a towed type using a pusher ship with a bucket 15 connected to a suspension wire hanging from the tip of a boom 18 that can turn horizontally on a crane 17. The bucket 15 is a clamshell bucket having a pair of openable and closable shells. The dredger 14 is anchored at all times during the dredging period near the dredged water area by driving a pair of spuds penetrating the hull vertically into the seabed in a separated state.

Next, with reference to FIGS. 1 to 4, the earth ship will be described in detail.
The ship 10 is a sealed type in which the bottom plate of the hull 19 does not open and close, and is towed by a pusher (not shown). The hull 19 has a rectangular shape in plan view that is long in the bow-stern direction. A rectangular mud 20 that is long in the bow-stern (ship length) direction is provided at the center of the hull 19. The maximum loading capacity of the mud 20 is 1000 m ³ . At the upper end of the peripheral wall of the mud 20, a rectangular edge block 21 is provided in a plan view that raises the peripheral wall over its entire length.
At the end of one side of the deck 16 of the ship 10, the length in the chute width direction is shorter than the length of the mud 20 in the stern direction, and the float frame 11 and one side of the ship 10 By covering the gap in the form of a bowl, the surrounding water area is polluted in the float frame 11 by receiving the spilled sand from the moving bucket 15 toward the gap with one side of the ship 10 on the upper surface. A prevention chute 22 is provided. The length of the surrounding water area pollution prevention chute 22 is about half of the length of the mud 20. A mud throwing partial chute 23 is formed at the end of the surrounding water area pollution prevention chute 22 on the mud 20 side to slide a part of earth and sand spilled from the bucket 15 into the mud 20. The inclination angle of the surrounding water area pollution prevention chute 22 is 30 °, and the inclination angle of the mud throwing partial chute 23 is 15 °. The chute width direction is the fore-and-aft direction of the clay ship 10, and the chute length direction is the ship-width direction (the direction perpendicular to the fore-and-aft direction) of the clay ship 10.

The end of one side of the deck 16 of the ship 10 and the upper surface of the one side of the edge block 21 extend from the end of the bow of the ship 10 in the length direction of the ship 10. A pair of rails 24 extending in the fore and aft direction are arranged in parallel over the intermediate portion.
Further, on one side of the deck 16, a moving means 25 is provided that moves the surrounding water area pollution prevention chute 22 in the bow-stern direction in accordance with the state of the sand and sand in the mud 20. The moving means 25 includes a moving carriage 26 on which the surrounding water area pollution prevention chute 22 is attached, and a forward winch (traveling winch) 28 that pulls the moving carriage 26 in the bow direction via a tow wire 27. A retracting winch (traveling winch) 29 that pulls the moving carriage 26 in the stern direction via another pulling wire 27 is provided. Further, the draw frame 30 draws the float frame 11 of the dredging work pollution control device 13 toward the one side of the ship 10 via the draw wire 30 at the end of the deck 16 of the deck 16 on the bow side. A winch 31 is provided.

The moving carriage 26 has a base material 32 made of one square steel that is long in the bow-stern direction. A plurality of lower wheels 33 that run on the rail 24 of the deck 16 are disposed on the lower surface of the base material 32 at a predetermined pitch in the length direction. Further, on the upper surface of the base material 32, a manually wound first winch (chute) in which the surrounding water area pollution prevention chute 22 is disposed at the use position in the face down state by winding the wire 35 through the installation base 34. (Rotating means) 36 and a second manually wound winch (chute rotating means) 37 that winds another wire 35 to place the surrounding water area pollution prevention chute 22 in the stowed storage position. Arranged. The tip of the wire 35 is connected to one fixing ring 35 a provided on the back surface of the surrounding water area pollution prevention chute 22, and the tip of another wire 25 is provided on the back surface of the mud throwing partial chute 23. It is connected to the fixing ring 35b.
Further, the base material 32 is provided with a plurality of support members 38 made of H-section steel at a predetermined pitch in the length direction. The upper end portion of each support member 38 is connected by a cross beam member 39 made of a single square steel long in the bow-stern direction. Moreover, the base part of the chute | shoot support material 40 which consists of a short square steel extended in a horizontal direction is being fixed to the ship outer surface of the upper end part of each support | pillar material 38. As shown in FIG. Each chute support member 40 is reinforced by a plurality of reinforcing frames 41 arranged in an inclined manner.

Between the front end surface of each chute support member 40 and the back surface of the end portion of the peripheral water area pollution prevention chute 22 on the float frame 11 side, the peripheral water area pollution prevention chute 22 is provided with a plurality of rotating shafts that are long in the bow-tail direction. A plurality of pivot support bracket structures 44 that are rotatably supported in a vertical plane around 43 are disposed. A base portion of an upper wheel support member 45 made of a long square steel extending in the horizontal direction is fixed to the inner surface of the ship at the top of each support member 38. A plurality of upper wheels 46 that run on the rail 24 of the edge block 21 are disposed on the lower surface of the tip portion of each upper wheel support member 45. In addition, when the peripheral water pollution prevention chute 22 is rotated to the use position, the tip of the mud throwing partial chute 23 is pressed against the tip of each upper wheel support member 45 so that the peripheral water pollution prevention chute 22 is laterally moved. It will be placed. Further, when the surrounding water area pollution prevention chute 22 is rotated to the retracted position, the lower end portion of the surrounding water area pollution prevention chute 22 is a chute standing guide plate which is erected on the one side of each deck 16 and is long in the fore-and-aft direction. 46 A is pressed against the outer surface of the ship, and the surrounding water area pollution prevention chute 22 is in an upright state (FIG. 6). In addition, by appropriately changing the winding amount of each wire 35 in the first winch 36 and the second winch 37, the inclination with respect to the surrounding water area pollution prevention chute 22 arranged at the use position is an optimum angle. Can be corrected. Further, on the upper surface of each upper wheel support member 45 on the most bow side and on the most stern side, the tip part of the traction wire 27 and the tip part of another traction wire 27 are connected to the middle part in the length direction. A pair of connecting rings 42 are fixed.

Next, with reference to FIG. 1 to FIG. 6, a coastal dredging method using the earth ship 10 according to Embodiment 1 of the present invention will be described.
As shown in FIG. 1 and FIG. 2, first, in the ship 10, the wire 35 is wound up by the first winch 36 and the surrounding water area pollution prevention chute 22 is arranged at the use position.
Thereafter, the dredger 14 is anchored near the dredging position, and the dredging work pollution prevention device 13 is moved to this dredging position, and the dredged water area is partitioned by the pollution prevention curtain 12 suspended from the float frame 11. Next, the tow ship 10 is towed to the vicinity of the dredging work pollution prevention device 13 by the towing vessel, and the drawing wire 30 led out from the drawing winch 31 is connected to one side of the float frame 11. Thereafter, the pulling winch 31 is operated to wind up the pulling wire 30, whereby one side of the float frame 11 comes close to one side of the earth transport ship 10. At this time, the peripheral water area pollution prevention chute 22 bent in a U-shape when viewed from the front, the gap between the float frame 11 and one side of the ship 10, and the mud 20 from one side of the deck 16. The space up to one side is covered from above.

  At the time of dredging, by turning the boom 18 of the crane 17, the bucket 15 is moved between the dredging position and the mud 20 of the clay ship 10, the lifting winch of the crane 17 is driven, and the suspension wire is moved to the boom 18. The bucket 15 is raised or lowered by winding or unwinding from the tip of the bucket. At this time, the open / close winch of the crane 17 (not shown) is driven, and the right and left shells are opened and closed by winding or unwinding the open / close wire from the tip of the boom 18. As a result, the earth and sand (including bottom mud) collected from the dredging position in the float frame 11 is picked up to the sky, and then dropped onto the mud 20 of the earth ship 10.

If the earth and sand spills from the bucket 15 toward the gap between the float frame 11 and one side of the earth ship 10 while the bucket 15 is being transported to the earth ship 10, the earth and sand is contaminated in the surrounding water area. It falls on the prevention chute 22 and then slides down the inclined upper surface of the surrounding water area pollution prevention chute 22 and returns to the float frame 11. At this time, a part of the fallen earth and sand is received by the upper surface of the mud throwing partial chute 23 and slid into the mud 20. Since it comprised in this way, the pollution of the water area around the dredging caused by the earth and sand which spilled in the clearance gap between the float frame 11 and the clay ship 10 can be eliminated.
In addition, when the state of the earth and sand in the mud 20 changes (for example, the end of the mud 20 on the bow side is full of earth and sand), the pulling wire 30 is removed from the float frame 11 and the earth ship 10 is After being advanced by the distance, the pulling wire 30 is connected to the float frame 11 again, and the pulling winch 31 is operated to bring the float frame 11 close to the earth ship 10. Thereafter, the towing wire 27 is wound up by the retreat winch 29 by the distance traveled by the earth ship 10 to pull the moving carriage 26 on which the surrounding water area pollution prevention chute 22 is mounted in the stern direction. Thereby, the effect of eliminating the pollution in the water area around the dredging described above can be maintained even if the earth ship 10 moves in the bow-stern direction in accordance with the movement of the loading position of the earth and sand in the mud 20. In addition, since the length in the chute width direction is shorter than the length in the stern direction of the mud 20, it is possible to reduce the size and cost of the surrounding water area pollution prevention chute 22. It should be noted that depending on the change in the state of the earth and sand in the mud 20, it is necessary to move the earth ship 10 backward and move the moving carriage 26 in the bow direction. In this case, the pulling wire 27 is wound up by the forward winch 28, and the surrounding water area pollution prevention chute 22 is moved in the bow direction by a predetermined distance.

In addition, since the moving means 25 includes the moving carriage 26 and the forward winch 28 and the reverse winch 29 that are pulled by the pulling wire 27, the cost of the moving means 25 is reduced. And its maintenance is easy.
Further, when storing the surrounding water area pollution prevention chute 22, the second winch 37 rotates it around the rotation shaft 43 to the upright side, and the surrounding water area pollution prevention chute is placed at one end of the deck 16 on the one side. Stand 22 upright. Thereby, the surrounding water area pollution prevention chute | shoot 22 does not become obstructive at the time of navigation and berthing of the ship 10.

  INDUSTRIAL APPLICABILITY The present invention is useful as a technique for an earth transport ship used when dredging sediment accumulated on the bottom of a seabed or river.

10 The ship,
11 Float frame,
12 Pollution prevention curtain,
13 汚 Work pollution prevention device,
14 Grab dredger,
15 Grab bucket for firewood,
16 decks,
20 Mud,
22 Surrounding water pollution prevention chute,
23 Partial chute for mud throwing,
25 moving means,
26 Carriage for movement,
28 Forward winch (running winch),
29 Reverse winch (travel winch),
36 first winch (chute rotating means),
37 second winch (chute rotating means),
43 Rotating shaft.

Claims (1)

Among dredging work pollution control devices that divide a dredging area by a pollution control curtain suspended from a rectangular float frame in plan view, one dredging side is close to one side of the float frame, and the dredging of a grab dredger A mud that collects the earth and sand collected from the dredged water area by a grab bucket is used in an earth ship provided in the center of the deck.
At the end of one side of the deck, the length in the chute width direction is shorter than the length of the mud in the stern direction, and the gap between the float frame and one side of the ship is made into a bowl shape. Covering the grab bucket for dredging while moving, the top surface receives spilled sand toward the gap with the one side of the ship, and a surrounding water area pollution prevention chute that slides down into the float frame. Provided,
The deck is provided with a moving means for moving the surrounding water area pollution prevention chute in the bow-stern direction according to the state of the earth and sand in the mud .
At the end of the surrounding water area pollution prevention chute mud side, a mud throwing partial chute is formed that slides a part of the earth and sand spilled from the dredging grab bucket into the mud,
The moving means includes a moving carriage on which the surrounding water area pollution prevention chute is attached, and a traveling winch that pulls the moving carriage in the bow-stern direction via a towing wire,
The surrounding water area pollution prevention chute is pivotally supported on the upper part of the moving carriage, with a rotation axis whose length direction is directed to the bow-stern direction,
The moving carriage includes a first manually-wound winch that rotates around the rotation axis by winding the wire to a use position in a state where the surrounding water area pollution prevention chute is turned down, and the peripheral A hand-wound second winch for rotating the water pollution prevention chute by winding another wire to the stowed storage position;
On one side of the deck, when the surrounding water area pollution prevention chute is rotated to the storage position, the end of the surrounding water area pollution prevention chute on the float frame side is pressed against one side of the deck. An earth transport ship provided with a chute standing guide plate for raising the surrounding water area pollution prevention chute .

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