Ships – Building
Patent
1980-09-22
1983-08-16
Blix, Trygve M.
Ships
Building
114 77R, 114352, 114269, 414391, 254 30, B63B 300, B63B 500, B63B 906
Patent
active
043984843
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention essentially relates to an assembly for installing a nuclear reactor block in a vessel.
BACKGROUND OF THE INVENTION
Up till recently, nuclear reactors have been built directly inside vessels, the reactors being assembled part by part using the hoisting machines usually emloyed in shipyards.
Some of the parts constituted undividable masses weighing several hundreds of metric tons. The result is that it has been practically impossible to envisage building a vessel propelled by nuclear power except in those few shipyards which have exeptionally powerful hoisting means available.
Further, such building of a nuclear reactor on board a vessel has required a very long time performance and has occupied the ship-building dock for an excessively long period. This has disorganized the construction program and incurred prohibitive costs.
Lastly, the working conditions when assembling reactors on board vessels have been unsatisfactory, in particular in so far as work could not be performed in conditions of real nuclear cleanliness.
That is why, in accordance with a known method, it has been proposed to form vessels in two prefabricated floating parts which are subsequently assembled together, one of the parts including a chamber in which a nuclear reactor block is inserted by a horizontal translation movement before the two parts are assembled together. A complex operation is required to install the nuclear reactor because of its bulk and its weight (several thousands of metric tons).
SUMMARY OF THE INVENTION
The invention aims to facilitate said positioning. It provides an assembly for installing a nuclear reactor block in a vessel. The vessel is built in at least two prefabricated parts which are then assembled end to end, one of the parts including a chamber in which said block may be inserted before said parts are assembled by a substantially horizontal translation movement of said block from a barge by rolling or sliding onto a temporary support situated in said chamber. The invention is characterized in that said arrangement assembly includes hoisting means composed of a plurality of guide columns for guiding the block in a vertical translation movement, the tops of said columns being provided with jacks from which said block is suspended by cables or the like and which allow it to be raised momentarily to remove the temporary support and to be lowered to make it rest in its final position in the aforementioned chamber.
Other characteristics and advantages of the invention become more clearly apparent from the following detailed description which refers to the accompanying drawings given only by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 9 are schematic and in order plan views (FIGS. 1, 8 and 9) and elevation views (FIGS. 2 to 7) of a vessel during the various stages of the building and equipping method in accordance with the invention.
FIG. 10 is a partially cut away schematic elevation of the vessel when building is completed.
FIG. 11 is a top view of the reactor block provided with hoisting means therefor.
FIG. 12 is an elevation in the direction shown by arrow XII in FIG. 11, of part of a column whose top is equipped with jacks.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accordance with one embodiment of the invention and referring in particular to FIGS. 1 to 10, a method of manufacturing and equipping a vessel propelled by nuclear power in accordance with the invention includes the following steps:
As seen clearly in FIG. 1, firstly, in a ship-building dock 1, a hull is built in two parts, namely, a fore part 2 and an aft part 3. The fore part 2 which rests in the dock 1 on chocks 4 has a chamber 5 designed to house a nuclear reactor or boiler block 6. In short, said block 6 is constituted by a casing 7 which contains in particular a tank and steam generators, not shown, said casing 7 and its contents being supported by a stand 8 with which moving means, not shown, are associated.
As shown clearly in FIG. 2, the reactor block 6 is tra
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patent: 3765359 (1973-10-01), Takezawa
patent: 3951088 (1976-04-01), Hikai
patent: 4018180 (1977-04-01), Yoshida
patent: 4276847 (1981-07-01), Ivanov
Hydraulics for Heavy Transport Ship--Fluid Power Intl., 7/1965.
Ateliers et Chantiers de Bretagne-ACB
Blix Trygve M.
Keen D. W.
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