Inclined cut GBS leg
AssigneeQuanta Associates, L.P.
InventorHarald Ramfjord
Life of this patent
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Abstract
The present invention relates to a gravity based structure 5 with a topside 2 on at least one hollow concrete platform leg 1 with a platform leg wall and a circular cross section. The at least one platform leg, includes an upper leg portion (4) cut off from a lower leg portion 3. The lower leg portion 3 has an upper sloped cut surface 10 inclined at an angle in the range of 1°-10° off a horizontal axis. The upper leg portion 4 has an upper leg sloped cut surface inclined at the same angle as the lower leg sloped cut surface 10 of the lower leg portion 3 whereby the angles are complementary, the sloped cut surfaces forming an inner and an outer obtuse cone with a common vertical longitudinal axis. Furthermore, the invention relates to method of forming a conical cut through a concrete platform leg of a GBS.
Claims7
A gravity based structure (5) with a topside (2) on at least one hollow concrete platform leg (1) with a platform leg wall and a circular cross section, comprising an upper leg portion (4) cut off from a lower leg portion (3), the lower leg portion (3) being secured to a foundation, wherein the upper leg portion (4) is separate from and resting on the lower leg portion (3);
- wherein the lower leg portion (3) has an upper sloped cut surface (10) inclined at an angle in the range of 1°-10° off a horizontal axis;
- and
- wherein the upper leg portion (4) has an upper leg sloped cut surface inclined at the same angle as the lower leg sloped cut surface (10) of the lower leg portion (3) whereby the angles are complementary, the sloped cut surfaces forming an inner and an outer conical portion with a common vertical longitudinal axis.
A method of forming a conical cut through a concrete platform leg of a gravity based structure, with a leg wall (33) and a circular cross-section, comprising;
- securing at least one first guide track (7a, 7b) in a horizontal plane around the platform leg (1);
- forming at least one hole through the leg wall (33);
- attaching a machine operated saw onto the horizontal first guide track with a sawing portion (9) through the hole (20) of the leg wall (33);
- operating the saw with the sawing portion (9) running at an angle in a range 1°-5° off a horizontal axis while moving the saw along the horizontal guide track (7a, 7b) while sawing through the leg wall at the angle in the range 1°-5° off the horizontal axis, while sawing through a full 360° around the platform leg wall (33) thus dividing the concrete platform leg into an upper leg portion (4) and a lower leg portion (3).
Dependencies are inferred from the claim text.