JPS596191A - Float on-float off ship - Google Patents

Abstract

PURPOSE:To safely perform vertical movement of a ship body through adjustment of a ballast, by providing an upper buoyancy structure to the bow part, cargo mounting deck above the ship body, in which a ballast tank capable of charging and discharging water is arranged in a ship, and a spud liftably in the stern part. CONSTITUTION:A buoyancy structure 2 always placed extensibly above a level of water is provided to a bow part 10b, and a cargo mounting deck 10c for loading a cargo 11 as a float is formed to an upper surface in the central part of a ship body. A ballast tank capable of charging and discharging water is arranged in the ship body 10. A spud 14 formed liftable and capable of stopping its bottom end to the sea bottom 13 is supported to a stern part 10a through guide supporting member 15. Vertical movement of the ship body 10 can be safely performed along the guide supporting member 15 of the spud 14 by ballast adjustment through charge and discharge of water in the ballast tank in a ship, and loading and unloading work of the cargo 11 can be safely further easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow 1-on float-off vessel capable of loading cargo as a floating body.

Figure 1 (
As shown in the side view), in order to be able to load the cargo 2 as a floating body on the upper deck of the hull 1, there is a water supply and drainage system at both ends of the hull 1, which is used when sitting on the seabed 3. A blast tank 4 is provided.

Then, after one end of the hull is seated on the seabed, the cargo 2 is pulled onto the upper deck of the hull, and then the hull 1 is floated right to the surface, so that the cargo 2 can be loaded onto the ship.

However, in such float-on/float-off ships, there is a drawback that the entire deck surface cannot be used effectively unless the loading deck tilts and is completely submerged during loading of cargo 2. .

There is also a conventional float-on/float-off ship as shown in FIG. 2 (side view), in which buoyancy structures 5 and 6 are provided at both ends of the hull 1, respectively, and extend upward. .

The cargo 2 as a floating body can be loaded onto the loading deck between both ends of the ship by pouring water into the inboard ballast tank.

However, in this case, in order to ensure the stability of the hull 1 when loading the cargo 2, buoyant structures 5 and 6 are required at both ends of the hull 10, and these buoyant structures 5 and 6 are also required.
It is necessary to add a ballast tank that can be filled with water to meet the buoyancy of the ship, and there is also the problem that the loading deck surface becomes narrow due to the buoyancy structures 5.6 at both ends of the ship.

The present invention is an attempt to solve the above-mentioned problems, and while making it possible to safely and reliably carry out cargo handling using the float-on/float-off method, a buoyant structure is provided only at one end of the ship's hull. It is an object of the present invention to provide a float-on/float-off ship that has a wide loading deck surface.

Therefore, the float-on/float-off ship of the present invention is provided with a loading deck for loading cargo as a floating body between both ends of the ship, and a ballast tank that can be filled with water inside the ship. One end is provided with a buoyancy structure extending upward, and the other end is provided with a spud that can be raised and lowered relative to the hull and whose lower end can be anchored to the seabed. It is said that

Hereinafter, a float-on/float-off ship as an embodiment of the present invention will be explained with reference to the drawings. FIG. 3 is a side view of the ship. Loading deck 1
0C is formed.

A buoyant structure 12 that always extends upward from the water surface is provided at the bow, which is one end 10b of the hull 10, while a buoyant structure 12, which always extends upward from the water surface, is provided at the stern, which is the other end 10a.
A spud 14 that can be raised and lowered relative to the ship and whose lower end can be anchored to the seabed 13 is attached to the guide support member 1 erected on the ship.
It is attached via 5.

Additionally, a ballast tank (not shown) to which water can be poured is provided inside the ship.

Since the float-on/float-off ship of the present invention is constructed like a "double series", when loading and unloading the cargo 11 as a floating body, the tsuzu spud 14 is guided by the supporting member 15.
The lower end of the spud 14 is anchored to the seabed 13, and the hull 10 is then lowered along the spud 14 while injecting water into the ballast tank in the hull JO.

After pulling the cargo 11 above the loading deck 10C, the hull 1 is drained from the last tank as described in Ajl.
cargo 11 on the loading deck],
Can be loaded onto OC. In addition, after loading the cargo 11, the spud 14 is placed under fM k nrh bottom 1.
It is raised to separate from 3.

When lowering cargo 11 from loading deck 10C to the sea surface,
It is sufficient to perform the above-mentioned loading operation in the reverse order.

According to the float-on/float-off ship of the present invention, the restoring force of the ship body 10 during cargo handling operations is provided by the buoyancy structure 12 provided at one end and anchored to the seabed 13 at the other end. This is ensured by the spud 14, which is attached to the spud 14. Therefore, the safety of cargo handling operations can be sufficiently increased.

The floating buoyancy structure 12 is provided only at one end of the hull 10, and since the hull 10 is often tilted, the area of the loading deck 10C can be widened, and this area can be used effectively for loading cargo. In addition, the buoyant structure 12 should have a minimum reserve buoyancy because the anchoring force of the suba 7 dos 14 to the seabed works extremely effectively to prevent the hull 10 from tilting. In addition to being able to reduce the volume of the onboard last tank commensurately, there is also the advantage that the area of the loading deck (1.0 C) can be made wider.

[Brief explanation of drawings]

Figures 1 and 2 both show conventional float-on
FIG. 3 is a side view showing a float-off ship, and FIG. 3 is a side view showing a float-on/float-off ship as an embodiment of the present invention. ioc
Loading deck, 11. Cargo as a floating body, 12. Buoyant structure, 13. Seabed, 14. Spud, 15.
Guide support member. Sub-Agent - Patent Attorney Yoshihiko Iinuma No. 1 Figure 2 Figure 2 /

Claims (1)

[Claims] A loading deck for loading cargo as a floating body is provided between both ends of the ship, and a ballast tank that can be filled with water is provided inside the ship, and a buoyancy structure extending in three directions is provided at one end of the ship. 1. A float-on/float-off ship, characterized in that a spud is provided at the other end of the ship, which can be raised and lowered relative to the hull, and whose lower end can be anchored to the seabed.