Technical challenges in the design and construction of the Troll gravity base structure

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:433632

Skjaeveland, H; Knudsen, A; Nyborg, A

The Troll gravity base structure (GBS), which currently is under construction, is the largest and tallest offshore concrete structure yet. The platform concept has several novel features. In order to reduce the wave loads from the substructure into the deck frame, a flexible deck connection is used for 2 of the 4 shafts. The Riegel structure at mid height is a new way of reducing the loads in the shafts and the natural periods of the structure. The platform location in the North Sea has some very soft layers of clay. To overcome the poor foundation condition, very deep skirt piles will be used. The Wave phenomenon, dynamic transient response, ringing has been addressed, both through model testing and analytical work. The enormous height of the concrete structure, over 370 meter has been a substantial construction challenge. In order to meet a very tight construction program, innovative methods of prefabrication have been used. In order to optimize the weight and stability of the structure during the floating phases, various concrete densities and strengths have been used.

• OSTI ID: 433632
• Report Number(s): CONF-940409--; ISBN 1-880653-10-9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
COMPUTERIZED SIMULATION
CONSTRUCTION
DESIGN
NORTH SEA
OFFSHORE PLATFORMS
SOIL-STRUCTURE INTERACTIONS