Ships – Scows – Dumping and unloading
Patent
1987-09-08
1991-05-07
Swinehart, Ed
Ships
Scows
Dumping and unloading
114 26, 4141373, B63B 3528
Patent
active
050127543
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the hull construction of hopper barge carrier vessels or boats used to convey gravel and crushed or quarried stones and dump them.
2. Description of the Prior Art
Vessels for marine civil engineering can be divided into roughly two types: the carrier vessel, which has a self-propelling capacity, and the pusher barge vessel, which does not. Generally, the former carrier vessel's self-propelling capacity results in high operational speed, but as loading and unloading of gravel and quarried stones are done by a crane or the like, its inefficiency, especially during unloading, constitutes a problem point. The latter pusher barge vessel has the disadvantage of low operational speed due to its lack of a self-propelling capacity, and must, therefore, be pushed by a pusher. However, as loads such as gravel or quarried stones can be disposed into the sea by opening the bottom, this vessel has the advantage of efficient unloading operations.
Accordingly, if it becomes possible to add an unloading function by opening the bottom of a carrier vessel with self-propelling capacity, the vessel's conveying and dumping potential can be maximized.
At present, however, as the constitutions of pusher barge vessel unloading hulls are of either the so-called hopper barge style, in which a bottom plate hung on chains or the like is released to unload, or the so-called full open style, in which sections of the hull connected to the hull by hinges are released to unload, neither can be applied to a carrier vessel due to hull construction. More concretely, an ore carrier, as an example of a carrier vessel with self-propelling capacity, is designed so that both sides of the double bottom DB are ballast tanks BT; thus ore can be loaded in the middle of hold HO, as illustrated in FIG. 29. In another example, the grain carrier, as illustrated in FIG. 30, is designed so that ballast tanks BT on both sides of the double bottom DB are made smaller to ensure voluminous hold capacity, while triangular ballast tanks, called shoulder tank ST, are provided at both upper sections of port and starboard and hatch HA is provided as supplementary equipment. Moreover, as illustrated in FIG. 31, the ore bulk oil carrier (OBO) is designed so that pipe tunnel PT is provided in the middle of double bottom DB with ballast tanks BT at both sides. Ore is not loaded in every hold; rather a loading method called alternate loading, in which completely empty holds and fully-loaded holds are alternated, is applied. In this way hull construction is devised according to cargo characteristics.
Moreover, even if the unloading hull construction of the above-mentioned pusher barge vessels is applied, it is difficult to maintain operational speed as a carrier vessel. When the above-mentioned hopper barge pusher barge vessel is in an unloading position, disposal is difficult in shallow seas as the bottom plate protrudes from the lower part of the bottom. Additionally, the construction requires that the bottom plate be hung, and a problem arises in that the weight of loaded cargo applies direct force, thus necessitating relatively large-scale equipment. On the other hand, although the part which protrudes from the hull is small in full open style vessels, a problem lies in fact that the type of machinery and equipment which are usually placed on deck and their placement positions are limited because the hull is separated structually and the deck does not run the full length of the vessel from stem to stern.
OBJECT OF THE INVENTION
The first object of the invention is to provide a hull construction suitable for a carrier vessel which can also be used as an ordinary cargo ship, and which does not pose the problem of limited sea area for disposal and equipment scale, as in the case of the hopper barge unloading hull construction of conventional pusher barge vessels, and which is not restructed in terms of machinery and equipment, as is the case in the full open style.
The second objec
REFERENCES:
patent: 279683 (1883-06-01), Wilson
patent: 357857 (1887-02-01), Rogers
patent: 2444299 (1948-06-01), Koenig
patent: 3509841 (1970-05-01), Boer
patent: 3596621 (1971-08-01), Werenskiold
Marusen Co., Ltd.
Swinehart Ed
LandOfFree
Open-bottom gravel dump boat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Open-bottom gravel dump boat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Open-bottom gravel dump boat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-932834