Concrete ceiling slab form installation and dome-supporting shore assembly therefor

Claim 1

In a concrete ceiling slab form installation, in combination, a plurality of generally coplanar rectangular slab-supporting domes arranged in checkerboard fashion and providing groups of domes which are disposed in horizontal contiguous quadrilateral relationship with converging corner regions, each dome being in the form of an integral inverted pan having a flat horizontal rectangular top wall, a continuous outwardly sloping sidewall comprised of four trapezoidal wall panels, a lower substantially continuous, generally rectangular, horizontal rim flange projecting outwardly from the lower rim of said sidewall, and a continuous vertical apron flange depending from the outer edge of said rim flange, the corner regions of the rim flange of each dome being truncated so that each of said groups defines a central rectangular void which interrupts the surface continuity of said rim flange, and a vertically disposed dome and slabsupporting shore cooperating with the converging corner regions of each of said groups, each shore comprising a post having its lower end resting on a foundation surface, a cradle member mounted on said post in the upper region thereof for rotation about the vertical axis of the post, said cradle member including a pair of ledgelike supports projecting laterally and radially outwardly from the post in opposite directions, said cradle member being movable between one angular position wherein said ledgelike supports extend in a seam line direction with respect to the checkerboard arrangement of domes and serve to underlie and support the converging corner regions of all of the domes of said group with the various apron flanges resting in on-edge fashion on said ledgelike supports, and another angular position wherein said ledgelike supports extend in a diagonal direction with respect to said checkerboard arrangement and are withdrawn from their underlying and supporting relationship with respect to the corner region of at least one of the domes of said group, and a rectangular filler plate disposed on the upper end of said post and projecting into the void that is established by said groups of domes in sealing relationship with respect to the marginal edges of the latter.