JP2000238692A - Unloader-cum-spreader barge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate a distance between an earth carrying barge and a point of a spreader by connecting the both by means of a bridge by using an unloader barge for unloading the earth from the earth carrying barge and a spreader barge for spreading the sand, to execute the sediment spreading work in the shallow sea area. SOLUTION: An unloader barge 18 loading an unloader 23 and a hopper for receiving the sediment, and a spreader barge 19 loading a spreader 30 for spreading the sediment, are connected by means of a bridge 20, the bridge 20 and the unloader barge 18 are connected rotatably around a vertical axis Y and a horizontal axis Z, the bridge 20 and the spreader barge 19 are firmly connected, and a belt conveyor 25 for conveying the sediment is mounted between the hopper and the spreader 30 through the bridge 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workboat used for sand covering performed for reclaiming soil and improving or purifying the seabed in landfill works.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. In the reclamation work at a maritime airport, as shown in FIG. 1, the earth and sand carried by the earth-moving ship 22 is unearthed by the earth-lifting machine 3 mounted on the earth-lifting ship 2 and landfilled using the revolving spreader 4. Discarded at land 5. The lifting ship 2 and the revolving type spreader 4 are provided with a belt conveyor 6 for conveying the earth and sand S.

[0003] In the initial stage of landfilling work, ground improvement work is carried out by covering the sea bottom with sand and driving a sand pile to compact the soft seabed. FIG. 2 and FIG. 3 show a sand covering ship (sand removal ship) used for the above sand covering work.

FIG. 2 shows a barge unloader / removal ship system using a barge unloader ship 7 and a dismantler ship 8. The barge unloader ship 7 is provided with a water injection pump and a suction pump 9, and the sand S carried by the earth transport ship 22 is injected into the slurry in the form of a slurry from the water absorption pipe 11 while being injected with water and stirring the sand. It is conveyed to the dismantling ship 8 and dislodged underwater by the dismantling pipe 13.

[0005] FIG. 3 shows a system using a sand-covered ship 16 on which the earth-lifting machine 3 and the tremy tube 15 are mounted. The sand S transported by the earth transport ship 22 is thrown into the hopper 17 by the earth lifting machine 3 and is discharged into the sea through the tremie pipe 15.

In recent years, a project has been planned to cover the seabed in the sea area where sludge has accumulated to purify seawater and breed fish and shellfish. It is necessary to disperse the sand widely in the sea area including the shallow sea area with a water depth of 0 to 2 m.

[0007] Since the conventional trummy tube type sand-covered ship 16 shown in FIG. 3 cannot be used for sand-covering in the shallow sea area, the barge unloader / removal ship system shown in FIG. 2 is adopted. However, there are the following problems. (B) The barge unloader / removal ship system transports sand S in the form of slurry. In the case of slurry transportation, transport efficiency is significantly higher when sand is the main component than when silt or clay is the main component. Decrease. (B) In order to discharge a large amount of seawater at the same time in order to remove sand, especially when constructed in a shallow water area, the ground on the seabed where sludge and silt have been deposited is stirred, resulting in pollution of the sea surface. (C) The removing ship 8 is moored by four wires and removes the sand S while moving the removing ship by expansion and contraction of the wires.
In shallow waters near land, the anchor installation position is limited to the water depth where the anchor ship can enter, so the wire extension angle cannot be made large. Accordingly, the dismantling ship 8 is moored in a direction perpendicular to the shoreline and has poor position holding accuracy. Therefore, the sand cannot be uniformly removed, and after the removal, a leveling operation using an underwater bulldozer or the like is required.

On the other hand, when the earth-lifting ship 2 shown in FIG. 1 is used as a barge for sand covering work, (a) the sand S is transported by the belt conveyor 6,
The transport efficiency is much better than the slurry transport described above. (B) The barge (discharge ship 2) is fixed in position by the spud and the sand is removed by the revolving spreader, so that the position can be accurately maintained and the sand can be covered to a uniform thickness. (C) Since only the sand is removed, no sea surface pollution occurs. However, there are the following problems. (D) The distance from the barge (lifting ship 2) to the tip of the spreader 4 is generally about 50 m to 70 m, and it cannot be used in shallow and shallow waters. (E) In order to mount a larger swivel-type spreader, not only the spreader 4 but also the barge (lifting ship 2) becomes large in order to prevent the barge (lifting ship 2) from tilting. Construction costs are greatly increased. Therefore, the conventional lifting ship cannot be used for sand covering work in shallow water except when the seabed gradient is large.

[0009]

PROBLEM TO BE SOLVED BY THE INVENTION The object of the present invention is to improve the efficiency of transporting sand, improve the economic efficiency, prevent sea surface pollution and improve construction accuracy, and enable sand covering work in shallow waters at shallow depths.

[00010]

Means for Solving the Problems As shown in FIG. 4, an unloading stand equipped with a lifting machine 23 such as a backhoe or a grab bucket and a hopper 24 for receiving earth and sand, as shown in FIG. Ship 18 and spreader 30 for soil removal
The bridge 20 and the unlogging barge 18 are connected rotatably around the vertical axis Y and the horizontal axis Z with the spreader barge 19 carrying the
The bridge 20 and the spreader barge 19 are rigidly connected, and a belt conveyor 25 for conveying earth and sand is arranged between the hopper 24 and the spreader 30 via the bridge 20. The spreader 30 is moved in the axial direction of the bridge 20 so as to be an extendable shuttle girder. In a state where the shuttle girder is contracted, the shuttle girder is connected to the bridge 2.
It may be stored on 0.

[0011]

4 and 5 are a plan view and a side view, respectively, of an embankment / covered sand barge of the present invention. The system of the present invention comprises an unloader barge 18, a spreader barge 19, a bridge 20, and a shuttle conveyor 21. The bridge 20 may have an elongated floating structure. The unloader barge 18 is provided with an earth-lifting machine 23 such as a backhoe or a club bucket and a movable hopper 24 for unloading the earth and sand S spilled by the soil carrier 22. Conveyor 25 and bridge 20
The belt is conveyed to the shuttle conveyor 21 by the upper belt conveyor 26, and sand is removed from the tip of the shuttle conveyor 21 or dumped into a landfill. When used as a lifter for landfill construction, the shuttle conveyor 21 is lifted using a lifting device 26 as shown in FIG. 6 and fixed in an inclined state to enable dumping of earth and sand on land. I do.

In the sand covering work, the unloader barge 18 is used.
Is fixed in position by the spud 27, and the spreader barge 1
9 is a connecting portion 28 between the unloader barge 18 and the bridge 20
The spreader 30 at the tip can be moved in the front-rear direction by an angle α (for example, 30 °) by moving the shuttle conveyor 21 in the front-rear direction by expanding and contracting the swing wire 29 around the center. Therefore, as shown in FIG. 7, it is possible to accurately remove sand from a wide area without moving the unloader barge 18.

When moving to another place, the shuttle conveyor 21 is retracted and stored on the bridge 20, and the spreader barge 19 is turned to the side of the unloader barge 18 as shown by the dashed line in FIG. Can be easily towed.

In the reclamation work, since the distance between the soil carrier 22 and the spreader 30 is longer than that of the conventional earth-lifting ship, it is necessary to make the soil carrier 22 berth with the unloader ship 18 in a place where the water depth is deep. Can be carried out, so the drafting boat with a large draft 22
By using, the economics of earth and sand transportation can be improved. It should be noted that, in this method, in the case of sand covering work or reclamation work in a shallow sea area, the earth transport ship 22 and the spreader 30 are used.
If the distance between them is insufficient, a floating conveyor 31 can be provided between the unloader barge 18 and the spreader barge 19 as shown in FIG. 8 to increase the distance.

[0015]

According to the present invention, a belt conveyor system is used for transporting sand, as in the case of a conventional unloading ship, so that it is possible to improve transport efficiency, improve economic efficiency, prevent sea surface pollution, and improve construction accuracy.

That is, in the sand covering work in the shallow sea area, the construction efficiency is greatly improved and the sand covering precision is greatly improved as compared with the conventional method of removing the sand in a slurry state using the “barge unloader ship 7 and the removing ship”. Can be improved and sea surface pollution can be prevented.

Further, the work of laying and collecting the floating pipe is not required, and the evacuation during a typhoon and the movement to another place are facilitated. Using an unloader barge 18 for unloading from the soil carrier 22 and a spreader barge 19 for removing the sand 8, the distance between the soil carrier 22 and the tip of the spreader is established by connecting the two carriers with a bridge 20. And make sand covering work in shallow waters shallow. That is, in landfilling work, the sediment can be dumped to a place away from the soil carrier without using a large barge and a swivel-type spreader, thereby improving the economic efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of an example of a system including an excavation ship conventionally used for large-scale landfill work.

FIG. 2 is a side view of a conventionally used barge unloader / removal ship system.

FIG. 3 is a side view of a conventionally used system including a tremy tube type sand capping vessel.

FIG. 4 is a plan view of a system including the unloading / covering sand barge of the present invention.

FIG. 5 is a side view of a system including the unloading and overdraft barge of the present invention.

FIG. 6 is a diagram showing a state in which the unloading and sand-covering ship is used as an unloading ship for landfill work.

FIG. 7 is a plan view showing a sand covering range by turning of the spreader barge without moving the unloader barge when performing sand covering work.

FIG. 8 is a plan view showing a state in which a floating conveyor is additionally provided in a method of lifting and covering sand on a barge.

[Explanation of symbols]

 2 earth-lifting ship 3 earth-lifting machine 4 revolving spreader 5 landfill 6 belt conveyor 7 barge unloader ship 8 dismantling ship 9 suction pump 11 water absorption tube 12 floating pipe 13 dismantling tube 15 tremy tube 16 overburden ship 17 hopper 18 unloader Barge 19 Spreader Barge 20 Bridge 21 Shuttle Conveyor 22 Earth Carrier 23 Lifter 24 Mobile Hopper 25 Belt Conveyor 26 Lifting Device 27 Spud 28 Connecting Portion 29 Swing Wire 30 Spreader S Sediment Y Vertical Axis Z Horizontal Axis

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsuo Sanomura 5-1 Enamiokicho, Naka-ku, Hiroshima-shi, Hiroshima MFC Engineering Service Co., Ltd. F-term (reference) 2D045 AA04 BA01 CA03 CA31

Claims (2)

[Claims] An unloader barge (18) equipped with an earthmoving machine (23) and a hopper (24) for receiving earth and sand, and a spreader barge (1) equipped with a spreader (30) for soil removal.
9) and a bridge (20).
0) and the unrogue barge (18) are rotatably connected around the vertical axis (Y) and the horizontal axis (Z), and the bridge (20) and the spreader barge (19) are rigidly connected. And a sand conveyer belt conveyor (25) disposed between the hopper (24) and the spreader (30) via the bridge (20). 2. The spreader (30) is connected to a bridge (20).
2. The lifting and covering sand barge according to claim 1, wherein the shuttle girder is a retractable shuttle girder that moves in the axial direction and is retracted on the bridge (20) when the shuttle girder is contracted.