A system for forming ventilated crawl spaces or interspaces or elevated platforms which comprise dome-shaped formwork elements supported on supporting tubes; the ventilated crawl space or interspace or elevated platform comprises first, second and third interconnection elements, which communicate with a lower end of the supporting tubes, which are adapted to form a channeled receptacle, which rests on a foundation or surface, for reinforcements; such channeled receptacle is adapted to receive a concrete casting to form a connecting beam between the supporting tubes.

A system for forming ventilated crawl spaces or interspaces or elevated platforms which comprise dome-shaped formwork elements supported on supporting tubes; the ventilated crawl space or interspace or elevated platform comprises first, second and third interconnection elements, which communicate with a lower end of the supporting tubes, which are adapted to form a channeled receptacle, which rests on a foundation or surface, for reinforcements; such channeled receptacle is adapted to receive a concrete casting to form a connecting beam between the supporting tubes.