BOPI 12 BR / 2024 REPERTOIRE NUMERIQUE 24 O.A.P.I. – B.P. 887, YAOUNDE (Cameroun) – Tel. (237) 222 20 57 00 – Site web: http:/www.oapi.int – Email: oapi@oapi.int concreted, a reinforcement cage for a top slab is assembled, formwork is installed and then the top slab is concreted and the top slab and base slab, as well as inner and outer walls are posttensioned with reinforcement strands. The feature of the method is that GBS is fabricated, including a central part and protruding part that have a common base slab. The inner and outer walls as well as the top slab are concreted for the central part of GBS, that takes form of a rectangular prism. As separate sections of outer walls of the central part are concreted, a reinforcement cage is assembled, formwork is installed and concreting is performed for inner and outer walls of the GBS protruding part, the outer walls of which are made along the perimeter of the base slab, and at the same time the height of the outer walls of the protruding part is lower than the height of the outer walls of the central part. As separate wall sections of the protruding part are concreted, a reinforcement cage is assembled and formwork is installed for a top slab of the protruding part and then concreted. The base and top slabs of the central part, as well as the inner and outer walls of the central part and protruding part are posttensioned as the top slabs of the central part and protruding part are concreted and the concrete of the post-tensioned structures is cured. A protruding part adds to buoyancy of the GBS and the entire structure, as well as reduces its submersion during transportation to an installation site. Fig. 5
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