Ships – Vessel raising and docking – Floating dry docks
Patent
1985-12-05
1987-08-18
Peters, Jr., Joseph F.
Ships
Vessel raising and docking
Floating dry docks
114 46, 405 4, 405 5, B63C 108
Patent
active
046869190
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for efficiently and economically constructing a large-scale marine structure which is installed on the sea for developing, for example, a submarine oil field or a submarine natural gas field.
BACKGROUND OF THE INVENTION
Recently, submarine oil fields and submarine natural gas fields are actively developed, and these development activities reach even the deep sea and the icy waters. As a result, marine structures installed on the sea for such development become huge in scale, and it is now impossible to construct such a large-scale marine structure in an existent dock.
As methods for constructing a large-scale marine structure which cannot be constructed in an existent dock as mentioned above, the following methods are known:
(1) As shown in FIG. 4, a plurality of barges, for example two barges 12 are landed via a plurality of blocks 10 onto the bottom of a dock 2 from which water is discharged, so that the upper surface levels of the barges 12 become flush with the level of the site 11. A large-scale marine structure 1 which cannot be assembled in the dock 2 is constructed by using the site 11 and the two barges 12 which are landed via the blocks 10 onto the bottom of the dock 2 and of which the upper surface levels are flush with the level of the site 11. Then, water is introduced into the dock 2 from the surrounding waters until the water surface level in the dock 2 becomes flush with the level of the waters, to cause the two barges 12 to float in the dock 2 together with the thus constructed large-scale marine structure 1, and then, the large-scale marine structure 1 on the two barges 12 is towed out from the dock 2 to the waters. In FIG. 4, 3 is a portal crane (hereinafter referred to as the "prior art 1").
(2) As shown in FIG. 5, a marine structure 1' is constructed, in a dock 2 from which water is discharged, up to a state in which an upper block 1" is not as yet mounted thereon. Then, water is introduced into the dock 2 from the surrounding waters until the water surface level in the dock 2 becomes flush with the level of the waters, to cause the marine structure 1' in the state in which the upper block 1" is not as yet mounted thereon to float in the dock 2, and then, the marine structure 1' is towed out from the dock 2 to the waters. The upper block 1" is mounted by means of a floating crane on the waters onto the marine structure 1' in the state in which the upper block 1" is not as yet mounted thereon, and the marine structure 1' and the upper block 1" are welded together to construct a large-scale marine structure 1 which cannot be assembled in the dock 2 (hereinafter referred to as the "prior art 2").
(3) For example, two blocks 1A and 1B for a large-scale marine structure 1, which blocks have a size corresponding to the construction capacity of a dock not shown, are constructed in the dock from which water is discharged. Then, water is introduced into the dock from the surrounding waters until the water surface level in the dock becomes flush with the level of the waters, to cause the two blocks 1A and 1B thus constructed to float in the dock, and then, the two blocks 1A and 1B are towed out from the dock to the waters. The two floating blocks 1A and 1B thus towed out to the waters are assembled on the waters as shown in FIG. 6, so that respective portions to be welded come into contact with each other. Then, the two floating blocks 1A and 1B are welded together on the waters to construct the large-scale marine structure 1 which cannot be assembled in the dock (hereinafter referred to as the "prior art 3").
(4) For example, two blocks 1A and 1B for a large-scale marine structure 1, which blocks have a size corresponding to the construction capacity of a dock not shown, are constructed in the dock from which water is discharged. Then, water is introduced into the dock from the surrounding waters until the water surface level in the dock become flush with the level of the waters, to cause the two blocks 1A and 1B thus construc
REFERENCES:
patent: 3656446 (1972-04-01), Hefferman
patent: 3680512 (1972-08-01), Yamura
patent: 3976022 (1976-08-01), Lapeyre
patent: 4056942 (1977-11-01), Yoshida
patent: 4084529 (1978-04-01), Katernberg
patent: 4231679 (1980-11-01), Ivanov
Inaba Takahisa
Kawai Chiaki
Ohta Minoru
Bartz C. T.
Nippon Kokan Kabushiki Kaisha
Peters Jr. Joseph F.
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