Abstract: A structural supporting system for use as a temporary support in concrete falsework construction and the like is disclosed. The structural supporting system includes a series of overlapping form beams and a plurality of cooperating brackets positioned along the length of the overlapping form beams. A bracket is provided at the opposite free ends of the overlapping form beams for mounting the overlapping form beams in the temporary concrete construction support. At least one other bracket, and preferably two other such brackets are positioned intermediate the opposite free ends of the overlapping form beams in order to provide adjustable extension and collapse of the overlapping form beams, so as to increase or reduce the span of the overlapping form beams, as desired.