An improved deck structure and connector for construction of demountable structures such as a parking building as well as permanent structures such as a high rise office or apartment building, comprising connectors spaced along the edges of a concrete slab for attaching the slab to an underlying beam. Each connector includes an upright bushing embedded in the slab for receiving a removable lifting bolt which expands to engage the inside walls of the bushing to lift the slab into location on the beam. The portion of the bushing engaged by the expandable lifting bolt is preferably tapered upwardly between a horizontal mounting plate which rests on top of the beam and an anchor rod extending laterally from the bushing into the slab. The lifting bolt can be released and removed allowing same bushing to receive a fastener bolt. An alternative embodiment provides a downward vertical flange on the connector for welding to an edge of the beam.