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Hibernia Gravity Base Structure: Completion of the Dry Dock Phase

• ID:

  1534

• ESCSI:

  4710.066

• Author:

  Woodhead, H. Roger; Atle K. Haug; Louis Chapdelaine

• Publication Name:

  Concrete International

• Type of Publication:

  Article

• Publisher:

  American Concrete Institute

• Dated:

  1995

• Issue/Volume:

  Sept., No. 10, Vol. 17

• Other ID:

• Page(s):

  34-41

• Reference List:

  Y

• Abstract:

  The massive Hibernia GBS is currently under construction while floating in Bull Arm, Newfoundland, Canada. It consists of a 106 m (348 ft) diameter, 85 m (279 ft) high concrete caisson. The caisson acts as a support for an oil production platform. It will rest on a series of skirts designed to penetrate into the ocean floor when the platform is finally installed on the Grand Banks. A base slab up to 1.4 m (4.6 ft) thick is supported on top of these skirts. This slab is designed to resist the large hydrostatic forces at mating and the bearing pressure due to the soil reactions when the caisson is full and becomes subjected to wave and iceberg forces.The slipform concrete is modified, normal-density concrete, using lightweight aggregate to replace some of the NW coarse aggregate. This reduced the density about 10%.00