JPH0115448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cargo handling method for loading and unloading a ship.

Conventionally, cargo handling work on a barge or cargo ship (hereinafter referred to as a ship), that is, loading work, and unloading work from a ship, which is generally called draining work, involve docking the ship to a quay or offshore work platform. It was done later.

However, weather and sea conditions may suddenly change between the time the ship berths, cargo handling work, and the time the ship leaves the berth, making it impossible to carry out the work. Either the ship and its cargo must be stopped and the ship and its cargo left in an unstable condition, or the ship must be evacuated to another port, which may result in damage to the cargo due to cargo collapse or delays in cargo handling operations due to evacuation. There were times when I did something like that. In addition, even during normal cargo handling operations, if the cargo is large and heavy, such as steel materials or steel structures, if the cargo is loaded from one side to the next, there is a risk that the ship will tilt and the cargo may collapse, so please take this into account when carrying out work. was extremely inefficient.

The present invention has been made in view of the above points, and involves a cargo handling vessel entering a work vessel fixed to the seabed with its deck lowered and berthed, positioning it on the deck of the work vessel, and raising the work vessel. By configuring the cargo handling vessel to load and unload cargo while holding it on the bottom of the work vessel, cargo handling operations can be carried out without being affected by weather or sea conditions. The present invention provides a cargo handling method that allows cargo handling to be carried out under extremely stable conditions.

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 is a side view of a work boat used in the cargo handling method according to the present invention, FIG. 2 is a plan view, FIG. The AA sectional view of FIG. 2 and FIG. 5 are both plan views. In these figures, work boat 1
The hull 2 is integrally formed with a U-shaped cross section by a gunwale 3, which is the left and right side walls, and a bottom part 4 (the upper surface of which becomes the deck 8). It is supported by a cylindrical leg 5 passing through it so that it can be raised and lowered. Between each leg 5 and the gunwale 3, the hull 2 and the leg 5 are connected to each other.
A lifting device 6 that can be raised and lowered is provided. That is, by raising the leg 5 with respect to the hull 2 and storing its lower end in the ship bottom 4, the work boat 1 can be freely navigated, and by lowering the leg 5 with respect to the hull 2. The construction is such that the work boat 4 can be fixed by landing on the seabed 7, and the hull 2 can be raised and lowered relative to the legs 5 in this fixed state. And on the left and right side walls 3 are mooring cables 9.
A pair of winches 10 for winding the mooring cables are provided at the center in the longitudinal direction of the hull 2, and when not in use, the other ends of the mooring cables 9 are attached to deck rollers provided close to the lifting devices 6 at the four corners. 10a, and when in use, the other end is configured to be fixed to a cargo handling vessel, which will be described later. Further, a windlass 11 for lifting the anchor is provided on the gunwale 3 on one side in close proximity to the deck roller 10a, and on the gunwale 3 on both sides, a windlass 11 is provided for mooring the work boat 1 to the quay 12 etc. A plurality of bollards 13 are provided for this purpose. A large number of bottom fenders 14 and rubber fenders 15 are provided on the deck 8 and inside the gunwale 3 to buffer the gap between the ship and the cargo handling vessel.
In addition, 16 is a cockpit, and 17 is a machine room.

On the other hand, in this embodiment, the barge 18 as a cargo handling vessel carries a large number of steel structures (hereinafter referred to as cargo) 19 as cargo on its deck, and
A plurality of derricks 20 for handling the cargo 19 are provided on both sides. Furthermore, work boat 1
A main tugboat 22 and a steering boat 23 are attached to the towboat 22 for towing the towboat with a towing cable.

A cargo handling method performed using the work boat 1, barge 18, etc. configured as described above will be explained. First of all,
The work boat 1 is towed to the quay 12 by the main tugboat 22, berthed as shown in Figure 5a, and the bollard 1
3 to be moored to the quay 12. Then, the lifting device 6 is operated to lower the leg 5, and as shown in FIG. 4a, the work boat 1 is fixed by landing on the seabed 7. In this case, the work boat 1 is lowered by the lifting device 6 until the deck 8 of the work boat 1 is lower than the bottom of the barge 18 so that the barge 18 can enter, thereby adjusting the stuttering.

Next, as shown in FIG. 5b, the towing line 21 of the main towboat 22 is reconnected to the barge 18, and after being towed to the vicinity of the workboat 1, it is pulled from the stern opening of the workboat 1 to the barge 18. Pull inward. In this case, the main towboat 22 cannot tow the workboat 1 due to the water in the workboat 1, so the towline 21 is reconnected from the main towboat 22 to the steering boat 23 and towed as shown in FIG. 5c.
Then, when the barge 18 has entered almost the center of the work boat 1, the towing boat 23 is separated from the barge 18, and as shown in FIG. Connect cable 9. Then, when the mooring line 9 is hoisted up by the winch 10 of the work boat 1, the barge 18 further enters the work boat 1, and is positioned on the deck 8 of the work boat 1 after entering the work boat 1, as shown in FIG. 5e. Ru. Thereafter, when the other mooring line 9 is connected to the stern side of the barge 18 and the winch 10 is slightly hoisted, the mooring line 9 is tensed and the barge 18 is moored to the work boat 1. FIG. 4b shows this state, where the deck 8 of the work boat 1 and the bottom of the barge 18 are separated, and the barge 18 is separated from the bottom of the barge 18.
8 is in a floating state. Therefore, when the hull 2 of the work boat 1 is raised by the lifting device 6, the barge 18
lands on the deck 8 of the work boat 1 and is held there. In this case, until the bottom of the barge 18 is located above the sea surface,
It is preferable to raise the deck 8 of the work boat 1. Figure 4c
shows this state, and the barge 18 and the work boat 1 are buffered by the bottom fender 14 and the rubber fender 15 interposed therebetween.

After the barge 18 is fixed in each direction in this way, the cargo 19 on the barge 18 is transferred to the derrick 20.
The cargo is unloaded onto the quay 12 by the following means. After the unloading is completed, when the hull 2 of the work boat 1 is lowered by the lifting device 6, the barge 18 and the work boat 1 are separated again, and the barge 18 reaches the sea surface as shown in FIG. 4d. surface. Therefore, the main tugboat 22 is connected to the barge 18 as shown in FIG. FIG. 4e shows the state in which the work is completed.

FIGS. 6 to 10 are diagrams showing other embodiments of the present invention corresponding to FIGS. 1 to 5, respectively, and the same reference numerals as in FIGS. 1 to 5 are used. Since it has the same configuration as , its explanation will be omitted. This embodiment is the same as the previous embodiment except that the cargo-handling boat enters the work boat from the side of the work boat, and the method of towing the cargo-handling boat accompanying this is different. That is, the hull 32 of the work boat 31
is formed integrally with a bow wall 33, a stern wall 34, and a bottom part 35 to have a vertically elongated U-shape in cross section, and a leg 5 and a lifting device 6 are provided at the four ends of the ship. In addition, the winch 36 is connected to the bow wall 33 and the stern wall 3.
The cockpit/machine room 37 is located on the bow wall 33.

Work boat 31 and barge 18 configured as above
We will explain the cargo handling method performed using the following. First, as shown in Figures 9a and 10a, the work boat 31 with a lower deck is moored to the quay 12 and fixed to the seabed 7, and then moved by the main tug 22 as shown in Figure 10b. Then, the barge 18 is towed to the side of the work boat 31. Then, the main tugboat 22 is moved to the barge 18.
As shown in FIG. 10c, the barge 18 is advanced into the work boat 31 from the side opening of the work boat 31 using two push boats 38. Figures 9b and 1
Figure 0 d shows the barge 18 having completed its approach, and the barge 18 is floating and the mooring line 9
It is held on the work boat 31 by. After doing this, as shown in FIG. 9c, the hull 32 is raised to allow the barge to land on the bottom and hold it there, and the same unloading work as in the previous embodiment is carried out. When the work is completed, the hull 32 is lowered to float the barge 18 as shown in Figure 9d, and the two main tugboats 22 are connected to the sides of the barge 18 as shown in Figure 10e. do. Then, as shown in Fig. 10 f, the barge 18 is pulled out from the work boat 31, and the main tugboat 22 is transferred from the gunwale side to the bow side, and then the cargo is unloaded by towing as shown in Fig. 10 g. Complete the work. FIG. 9e shows the completed state of the work.

In addition, in each of the above embodiments, the cargo handling method on a quay on land was illustrated, but it can be similarly carried out on quay-like structures installed on the sea such as offshore work platforms. It goes without saying that the same method can be used in work as well.

As is clear from the above explanation, according to the present invention, as a cargo handling method for loading and unloading a ship, a cargo handling ship is brought into a work ship fixed to the seabed with its deck lowered and docked. It is positioned on the deck of the work boat, and by raising the work boat, the cargo handling boat is placed on the bottom of the work boat and is held there while loading and unloading, so there is no need to worry about weather or sea conditions during cargo handling operations. Even if the situation suddenly changes, the cargo handling vessel is firmly held by the work vessel and can continue its work, so there is no need to evacuate the cargo handling vessel offshore or to another port, and there is no need to delay cargo handling or evacuate. This eliminates the danger of fuel consumption and waste of fuel.
In addition, since the cargo handling vessel is always firmly held in a horizontal position, the cargo does not collapse due to the movement of the vessel, and even if the cargo is large and heavy such as steel structures, it can be handled from one side in order, increasing work efficiency. improves. Also,
Since work ships are not affected by weather or sea conditions, they can also be used as temporary storage sites for cargo handling ships.

[Brief explanation of drawings]

Figures 1 to 10 are diagrams for explaining the cargo handling method according to the present invention, in which Figure 1 is a side view of a work boat used in the cargo handling method, Figure 2 is a plan view, and Figure 3 is a plan view. FIG. 2 is an AA sectional view, FIG. 4 is an AA sectional view of FIG. 2 for explaining the cargo handling method, FIG. 5 is a plan view, and FIGS. 6 to 10 are other embodiments of the present invention. Fig. 6 is a side view of a work boat used in the cargo handling method, Fig. 7 is a plan view, Fig. 8 is a BB sectional view of Fig. 7, and Fig. 9 is a diagram for explaining the cargo handling method. FIG. 7 is a BB sectional view, and FIG. 10 is a plan view. 1, 31... work boat, 5... leg, 6... lifting device, 8... deck, 18... barge, 19... cargo, 22... main tugboat, 38... push boat.

Claims (1)

[Claims] 1. A cargo handling method for carrying out loading and unloading work from a cargo handling vessel using a work boat having a hull having a roughly U-shaped cross section formed by the bottom and both side walls constituting the deck, and legs for lifting and lowering, The work boat is berthed, the hull is fixed to the seabed with legs, and the deck is submerged in the sea so that it is lower than the bottom of the cargo ship.Then, the cargo ship is moved between the side walls of the work boat and the deck is fixed to the seabed using legs. After being positioned above, the hull of the work boat is raised along the legs to keep the cargo ship on the deck, and in this state the cargo ship is loaded and unloaded. A cargo handling method characterized by submerging the hull of a cargo ship in the sea, surfacing the cargo ship from the deck, and taking it out of the work vessel.