SUPPORT SUBSTRUCTURE FOR PERMANENT OFFSHORE PLATFORM

FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms. ^ SUBSTANCE: support substructure comprises three-dimensional latticed structure having prismatic shape and composed of tubular members. The structure has vertical panels with posts, cross-pieces, struts and horizontal diaphragms connected one to another. Horizontal diaphragms have guiding nets for marine risers. The structure is secured to ground by main piles arranged in vertical posts and by foundation having additional piles, which is rigidly connected to tubular members of side edges of above structure. The structure is provided with ice-protection means formed as two truncated prisms of sheet steel and having beveled side ribs rigidly connected one to another by major bases. Marine risers are arranged inside prisms. Each prism of ice-protection means is rigidly connected with tubular members of corresponding diaphragms of three-dimensional latticed structure. ^ EFFECT: increased resistance to wave, seismic and ice loads, improved manufacturability and, as a result, reduced cost of permanent offshore structure building. ^ 3 cl, 2 dwg