Adjustable truss for concrete construction

Claim 1

Shoring apparatus for supporting concrete forms above a floor comprising: upper and lower beams extending horizontally and being vertically spaced from each other; a plurality of laterally spaced tubular upper column members joined at their upper ends to the upper beam and joined at their lower ends to the lower beam; a plurality of diagonal member extending between substantially said upper and lower beams to connect said beams and upper column members into a rigid truss structure that can be moved as a unit from one location to another; a plurality of lower column members extending into the upper column members and rapidly slideable into and out of the upper column members without repeated turning and with a close sliding fit therein to stabily support the respective upper column members; means for fixing the position of each lower column member including a pin, a plurality of pin-receiving holes spaced along the length direction of each lower column member, and walls forming a pin-receiving hole near the lower portion of each upper column member; the lower beam having a wide flat lower flange forming a substantially even rolling surface, and the lower ends of said upper column members lying at a level above the bottom of the lower beam; and a plurality of rollers substantially fixed in location on the floor, and rollably supporting the lower flange of the lower beam.