The three-dimensional structure (1) is formed of unit modules (2) mutually assembled in juxtaposition and / or superposition, each comprising a single vertical tube (1 1) at the upper end of which is mounted an end cap (12 ) for receiving the vertical tube (11) of another unit module (2) located above. This end piece (12) comprises beam fixing bearings for fixing horizontal beams (16) forming a support frame for a grid (24) provided in the upper part of each unit module (2). The unit modules (2) placed on the ground comprise a base (3) serving as a base for supporting the ground. Each vertical tube (11) may include one or more crutch fixing bearings for the inclined mounting of oblique stiffening crutches (27) which each connect the vertical tube (11) of two adjacent unit modules (2).
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