Abstract: A crack inducer controls propagation of cracks in set concrete containing reinforcing bars. The crack inducer has an elongated, rigid core that is relatively narrow in a direction that is parallel to outer surfaces of the concrete. The core has a core width in a first plane that intersects the outer surfaces of the volume, that is at least 20% of the concrete volume width so that a crack in the volume of concrete is induced to propagate from the core and along the first plane. A plurality of spaced cross-plates are connected to the core and a water-stop may be included around part of the core.

Abstract: A crack inducer controls propagation of cracks in set concrete containing reinforcing bars. The crack inducer has an elongated, rigid core that is relatively narrow in a direction that is parallel to outer surfaces of the concrete. The core has a core width in a first plane that intersects the outer surfaces of the volume, that is at least 20% of the concrete volume width so that a crack in the volume of concrete is induced to propagate from the core and along the first plane. A plurality of spaced cross-plates are connected to the core and a water-stop may be included around part of the core.

Abstract: A crack inducer plate assembly for concrete structures having a volume and an outer surface includes an elongated and rigid core plate for extending in the volume at a location spaced from the surface, the core plate having opposite sides. A waterproof and resilient waterstop member is fixed to and covers the opposite sides of the core plate. Crossplates are welded to the core plate to anchor the core plate to reinforcing bars in the concrete. Cracks are formed in a controlled manner within the volume and by the waterstop member.

Abstract: A method for casting multiple floor beams including the steps of assembling a multiplicity of spaced pan form units where the space between adjacent pan units forms the side of a beam form. A bottom panel is positioned between adjacent pan units to form the bottom of the beam form. The pan units are then locked together on their underneath sides to form an integral pan deck. Reinforcing framework is added into the beam forms and the pan form units are then locked together on their top sides. Concrete is then cast into the beam forms to form beams of a first floor level after which the underneath sides of the pan form units are unlocked and the bottom panel removed. The integral pan unit is then raised by jack means to a second floor level. During the time that the integral pan deck is being raised or after it is raised, the bottom panel is repositioned and the panels are again locked together on their underneath sides. The assembly is then in position in which the steps may be repeated.