Grid beam system for slab formwork

A formwork grid system, comprising:

• a plurality of props;
• a plurality of primary beams;
• a plurality of secondary beams;
• and
• a plurality of multi-level drophead units mounted on the plurality of props and adapted to couple to at least one of the plurality of primary beams and the plurality of secondary beams to form a first grid used as a platform to build a structure in an interior of a building, and a cantilever grid, the first grid having a first sheathing member, the cantilever grid having a second sheathing member, and each multi-level drophead unit of the plurality of multi-level drophead units comprising:
• a base plate coupled to a prop from amongst the plurality of props;
• a stem attached orthogonal to the base plate;
• and
• a slidable flyplate slidably mounted on a portion of the stem, comprising:
• a pair of first attachment portions formed on a periphery of the slidable flyplate and adapted to receive one of a primary beam of the plurality of primary beams and a secondary beam of the plurality of secondary beams, wherein the first sheathing member and the second sheathing member are adapted to form a horizontal surface over the primary beam and the secondary beam, and wherein the secondary beam comprises:
• a body having a pair of top flanges extending along a longitudinal side of a profile and adapted to receive one of the first sheathing member and the second sheathing member;
• a nailing insert extending along the longitudinal side of the profile and interposed between the pair of the top flanges;
• a self-rotational lock adapted to insert into a cavity of the primary beam in a predefined orientation, wherein the self-rotational lock rotates from the predefined orientation inside the cavity to secure the self-rotational lock in the cavity;
• a hook adjacent on the self-rotational lock and adapted to engage to a lip of the cavity;
• and
• a plurality of slots formed at predetermined gaps along the body of the secondary beam to hold the body, wherein each slot includes a polymer cap having projections;
• and
• a pair of flanges having second attachment portions and a pair of third attachment portions formed on the periphery of the slidable flyplate and adapted to receive one of the primary beam and the secondary beam,
• wherein the pair of first attachment portions and the second attachment portions are co-planar at a first level, and the pair of third attachment portions are positioned at a second level.