METHOD FOR FORMING SUPPORT SUBSTRUCTURE FOR PERMANENT OFFSHORE PLATFORM

FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms. ^ SUBSTANCE: method for forming support substructure by welding large blocks involves producing and serially connecting precast members to create flat units, namely panels and diaphragms; connecting flat units by tubular inserts and tubular links to create three-dimensional latticed structure. All operations are divided into four stages in accordance with technological order. The first stage includes forming tubular links and tubular inserts, pile sections and marine riser sections. The second stage includes assemblage of flat panels and diaphragms in horizontal position on corresponding mats. The third and the forth stages include simultaneous installation of flat panels and diaphragms and rigid connection thereof. ^ EFFECT: reduced labor inputs, time and cost for assembly work performing due to elimination of complicated tubular joints used as assembly units. ^ 3 cl, 7 dwg