Ships – Building
Patent
1982-01-22
1984-10-16
Blix, Trygve M.
Ships
Building
114 77R, 414779, B63B 300, B63B 900
Patent
active
044767978
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to shipbuilding and more particularly to methods for assembling modules of a ship hull and apparatus for effecting same.
These modules are then used to assemble parallel middle bodies of hulls of ships intended to carry liquid, bulk and gaseous cargoes.
DESCRIPTION OF THE PRIOR ART
A module of a ship hull is a rigid structure comprising a transverse bulkhead section and two pairs of sections perpendicular thereto and installed at its ends.
Depending on the type of the perpendicular sections, the module being assembled may be a D-type module which includes
a deck section and a bottom section--one pair, and a side section and a longitudinal bulkhead section--another pair;
a complete module which includes a deck section and a bottom section--one pair, and a starboard side section and a port side section--another pair; and
a central module which includes a deck section and a bottom section--one pair, and two sections of longitudinal bulkheads--another pair.
At present there is known in the art a method of assembling a D-type module of a ship hull (cf. French Pat. No. 2,101,359, cl. B63b 3/00, 1972) according to which a module is assembled in the following sequence.
First a transverse bulkhead section is installed in a horizontal position on the supports with the help of a crane, whereupon a longitudinal bulkhead section and a side section are in the same way installed in a vertical position and joined to the transverse bulkhead section. Then a bottom section and a deck section are installed in a vertical position and joined to the already assembled section to make up a D-type module.
The sections are joined together with the use of any known technique providing a permanent connection, for example welding.
All the sections are installed in the predetermined positions with the help of cranes.
A disadvantage of such a method of assembly is that the assembly of a D-type module with the use of tranditional cranes is characterized by long duration of erection work and great amount of poorly mechanized adjustment work, which results in an increase in the time spent for assembling modules and in a decrease in labour productivity. For example, the installation of a section in the predetermined position requires several hours and is characterized by a great amount of manual operations performed when marking the section edges, Moreover, the adjustment of edges of the sections is performed either with the section positioned vertically which prevents mechanization of the work or requires additional operations to be performed, such as placing the sections to a horizontal position, cutting the edges and installing the sections again in a vertical position.
There is also known in the art an apparatus (cf. Japanese Pat. No. 51-43279, cl. B63b 9/06, 1976) for assembling blocks, for example of a double bottom of a ship hull. The block being assembled consists of two sections mounting the framing and joined together.
The apparatus disclosed in the above-indicated patent comprises two symmetrical bearing platforms mounting turnover platforms. Each turnover platform is fitted with a drive to turn it about the horizontal axis and with grippers to hold sections of the block being assembled. The axes of rotation of the turnover platforms are disposed at the adjacent ends thereof which ensures their turning towards each other.
Prior to assembling a block both turnover platforms are positioned horizontally. Then a section of the block to be assembled is placed on each turnover platform and secured by means of the grippers. The turnover platforms are rotated towards each other to bring the sections in proper registry, whereupon the sections are welded together to make up the block of a double bottom of a ship hull.
However, said apparatus cannot be used to assemble D-type or complete modules of a ship hull, comprising a transverse bulkhead and two pairs of sections perpendicular thereto and installed at the ends thereof. Moreover, the apparatus design is inefficient since one and the same
REFERENCES:
patent: 1668300 (1928-05-01), Aiken
patent: 3695459 (1972-10-01), Raes
patent: 3698344 (1972-10-01), Maeda
patent: 4077106 (1978-03-01), Lichtenstein et al.
"Ship-Moving Equipment," Ettin & Chekletsov, Leningrad, Sudostroyeniye/Ship Building/Publishers (1970), p. 70 (FIG. 32).
"Cranes and Elevators in Industrial Enterprises," Ushakov & Brodsky, Moscow, Metallurgia Publishers (1974), p. 163, (FIG. 6.29).
"Integrated Mechanization of Hoisting and Conveying Operations in Shipyards," Plakhin, Leningrad, Sudostroyeniye/Ship Building/Publishers (1973, pp. 121 and 122), FIGS. 73.
"Handbook for General-Purpose Construction Engineering," Sdroyizdat Publishers (1959), p. 311.
Averbukh Anatoly B.
Evstafiev Evgeny A.
Ivanov Jury P.
Tarasov Alexandr E.
Blix Trygve M.
Corl Rodney
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