Long-span in-situ concrete structures and method for constructing the same

The invention herein resides generally in the art of concrete building structures. More particularly, the present invention relates to spans across long distances, utilizing in-situ forms. Specifically, the present invention relates to a structure that facilitates stressing of concrete spans. This is accomplished by installing cables into a form and then placing them under tension against cast-in-place concrete or an external form support. Next, the concrete is poured into the form around the cables. Once the concrete has set, the tension in the cable is released for transfer into the span. A long-span structure formed in-situ and extending between supporting structures includes at least two form supports extending between the supporting structures. Each end of the form support includes a bearing plate coupled to the adjacent supporting structure. A plurality of form hangers frictionally engage the form supports, wherein each form hanger has upwardly extending hooks. A beam form is carried by the plurality of form hangers and extends the length of each form support. Each beam form has opposed side walls connected by a bottom to form a cavity. Each sidewall has a downwardly extending hook mating with the upwardly extending hooks. A deck is supported by the beam forms with the cavities remaining open. The concrete is receivable at least in the cavities to form the long-span structure.