SEMI-SUBMERSIBLE PLATFORM FOR USE IN THE OPEN SEA

1. The invention relates to a semi-submersible platform (26) comprising: an inner column (15) and at least four outer columns (14), in which each of the inner and outer columns (14, 15) is made from reinforced concrete and comprises a resistant base (12), a shaft (5a, 5b; 6a, 6b) and a section (7) located at a pre-determined height and having greater resistance. The semi-submersible platform also comprises a plurality of beams (8) at the aforementioned pre-determined height, which connect each outer column (14) to the inner column (15) and to each adjacent outer column, and a plurality of anchor lines (11) designed to be anchored to the more resistant section (7) of each outer column (14). The semi-submersible platform (26) also comprises a lower plate (9) on which the columns (14, 15) are secured and which is reinforced with a plurality of beams (13) that connect the base (12) of each outer column (14) to the base of the inner column (15) and to the base (12) of each adjacent outer column. The invention relates to a method for the construction of a semi-submersible platform.