Offshore structure

A lattice framework for an offshore structure capable of supporting a deck above the water for offshore operations such as drilling for oil or gas for exploration or production as well as radar stations and the like where it is desired to maintain a stable platform in a fixed position over the sea bed, said framework including the combination of four upwardly extending main legs oriented in spaced-apart relationship about a central axis, cross brace means connected between the main legs at vertical intervals to form a support lattice therebetween, a spread base connected to the lower portions of the main legs, said spread base including four buttress legs extending from the main legs in downwardly and outwardly inclined directions in planes defined by two pairs of adjacent legs, additional cross brace means connected between the buttress legs and lower portions of the main legs to form another support lattice therebetween, means for supporting a plurality of foundation piles adjacent the lower ends of the main legs and lower ends of the buttress legs, one of the aforesaid pairs of adjacent main legs being oriented parallel to form launch rails on which the structure can be launched from a barge, and strengthening brace means in said framework connected with said two adjacent main legs of the one pair to resist launch loads.