Hydraulic and earth engineering – Marine structure or fabrication thereof – In or on frozen media
Patent
1985-11-21
1987-10-20
Husar, Cornelius J.
Hydraulic and earth engineering
Marine structure or fabrication thereof
In or on frozen media
405204, 405210, E02D 2100, E02D 2500, E02D 2738
Patent
active
047010754
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to civil engineering and, in particular, to offshore platforms designed for carrying technological equipment and life-support system packages in development of continental shelves.
PRIOR ART
At present such offshore platforms are mainly made from steel and reinforced concrete. The latter is thought to be better suited for freezing seas, particularly prestressed reinforced concrete. It possesses such indispensable properties as strength, water-tightness, fire-resistance, durability, endurance, rigidity, resistance to subzero temperatures, wear-resistance and many others making it a highly effective material and sometimes the only one which could be used for offshore structures. Concrete in submersible structures becomes even stronger due to the volume stress produced by the hydrostatic pressure at depth. Local damage of reinforced concrete can very often be easily repaired.
Reinforced concrete submersible platforms for offshore recovery of mineral wealth can be towed to a new location after the resources of the old one are exhausted. New deposits can be industrially exploited at a minimal cost by using mobile platforms.
These platforms are made of cast-in-place concrete. Prefabricated components can only be used for some floor beams, breakwater parts and central shaft sections.
Known in the art is a cast-in-place reinforced concrete offshore platform comprising an equipment deck, supporting columns and a honeycomb caisson foundation. The platform foundation is used to transfer oil storage and ballasting in order to make the platform rest more stably on the sea bottom. The platform is built in slip forms, initially in a dry dock or a pit and later on in a shipyard. The completed platform is towed afloat to a selected location.
Such platforms are designed and constructed for mild weather conditions only. In addition, making cast-in-situ reinforced concrete structures in slip forms in harsh winter climates of Arctic and Far East regions presents numerous difficulties or is next to impossible to realize at all.
Also known in the art is a sectional reinforced concrete offshore platform comprising a honeycomb foundation, a support and an above-water structure. It also comprises a bottom slab, annular and radial partitions and a side shell.
A large variety of types and sizes of section elements and a multitude of extended joints packed with reinforcements are certainly disadvantages of this platform. Joints can be cast with concrete but the quality of such casting-in-situ is usually low and the durability of the structure is affected. It can even invite accident.
BRIEF DESCRIPTION OF THE INVENTION
It is an object of the invention to provide an offshore platform wherein the design of the principle components ensures better three-dimensional rigidity, greater bearing strength, improved resistance to ice push, and makes it easier to build such structures in severe weather conditions.
There is provided a reinforced concrete offshore platform comprising a honeycomb foundation, a supporting structure and an above-surface section to carry the equipment, wherein, according to the invention, the foundation and the supporting structure are made of prefabricated reinforced concrete elements which are polyhedral hollow prisms set with gaps between the external faces thereof and integrated by a system of prestressed vertical and horizontal diaphragm walls made by prestressing the reinforcement bars in the gaps between the prism faces and casting it with concrete later on.
In one of the embodiments of this invention each prism features cantilever ledges on side faces, the prestressed reinforcement bars arranged in the gaps between the prisms being made tight over said ledges.
In another embodiment of this invention prisms are secured to the bottom of the platform foundation along the perimeter thereof, one side of said prisms, which faces the sea floor, being split open.
One more embodiment of this invention has the honeycomb foundation, supporting structure and above-surface
REFERENCES:
patent: 3472031 (1969-10-01), Kelso
patent: 3698198 (1972-10-01), Phelps
patent: 3913335 (1975-10-01), Heier
patent: 4037423 (1977-07-01), Knutsen
patent: 4422804 (1983-12-01), Gerwick
patent: 4448570 (1984-05-01), Berthin
patent: 4511288 (1985-04-01), Wetmore
"Order In Space", Keith Critchlow, C 1969, Appendix 2.
Ilyasova Nelli I.
Kotelnikov Jury S.
Kutukhtin Evgeny G.
Martyshenko Jury P.
Martyshenko Sergei J.
Husar Cornelius J.
Novolipetsky Politekhnichersky Institut Imeni Leninskogo Komsomo
Stodola Nancy J.
LandOfFree
Reinforced concrete offshore platform does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reinforced concrete offshore platform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reinforced concrete offshore platform will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1609791