Mechanical structure of Light Chassis of the Flat Platform type of New Technology for Heavy Load, which is characterized in that it is manufactured with steel material of new technology (DOMEX700 MC), with a light structural weight unit, a higher capacity of useful load, less oxidizing problems, less rigidity, resistant to wear, torsions and impacts. The invention comprises a couple of beams (1), a core (2) with a cant at the mid portion thereof, triangle type perforations (14) for lightening the beams and supporting the weight of the useful load; a lower skid (3) and an upper skid (4) that form the beam structure; said beams with I-shaped grooves intended to locate the separators or intermediate bridges (6) provide support to the load and form the structure of the chassis; said separators or intermediate bridges with cross members(9) and lateral steel angles (11) form the structure for the floor of the unit (10); this floor has a coupler or plate (5) for towing the unit; the separato rs or intermediate bridges (6) form a sliding frame (7) which slides the suspension (8) for performing maneuvers; the invention has a base for receiving a soffit (12), a soffit carrier (24), a rear bridge with perforations for rear lights or lights (23) and bumper (13).
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