METHOD FOR ERECTION OF MARINE PROCESS COMPLEX Russian patent published in 2010 - IPC E02B17/00 

FIELD: construction.

SUBSTANCE: method includes analysis of horizontal and vertical loads acting at platform basements depending on external environmental conditions and depth of their installation, according to which periods of favourable operation are determined - windless and ice-free months, periods of unfavourable operation - ice and/or hurricane seasons, and also periods of higher seismic activity and periods of tsunami. With selected dimensions of upper part of platform in plan and thickness of ice field, characterising force of shift, values of external and vertical loads at platform base are determined, and also dependence of permissible total loads as number of supports and cemented piles changes at various depths and preset safety margin. On the basis of the latter, nomograms are built, which identify limits of permissible loads at basements of marine platforms during operation in year-round or in seasonal periods. At the same time on the basis of nomograms, determining limits of permissible loads at basements of marine platform, trapezoidal or prismatic structure of platform basement is selected, and also necessity of using artificial gravitation or using pontoon devices is considered. After analysis, scheme of process complex arrangement is identified. At the same time for efficient resistance to external loads, each basement of platform is rigidly joined to bottom board. Bottom board is fixed to solid soil with the help of cemented piles. Upper deck is installed onto supports of platform basement, where wellhead equipment of process wells is located, and process modules are installed on top. Besides upper deck is arranged below sea level to provide for the possibility for ice cover and/or icebergs, and/or lower wave limit to pass through during hurricane or tsunami. Process modules are arranged as self-propelled and specialised. Process modules are operated during favourable periods, and external limit load is assigned for unfavourable periods, in compliance with which process wells are closed. Then specialised process modules are disconnected from upper deck of base and are brought to service base. At the same time at least one upper deck is equipped with sliding deck, which is telescopically connected to supports of base with the help of sliding supports. Sliding deck is connected to self-propelled process module in favourable period, and in unfavourable period, after disconnection of sliding deck and self-propelled process module, sliding deck is lowered and arranged below sea level at the distance providing for no interaction of marine platform base elements with ice field or icebergs, or hurricanes or tsunami.

EFFECT: invention makes it possible to increase reliability of marine platforms erection.

9 cl, 23 dwg