Concrete flooring

A framework for constructing a concrete floor structure in-situ comprising a framework that is rigid and encloses a series of inflatable tubular members, the framework comprises upper and lower framework elements in a form of upper and lower layers of meshes, and wherein the framework further comprises restraint members that are engagable with said upper and lower framework elements, said inflatable tubular members being inflated to an extent limited by the rigidity of the framework such that said tubular members adopt a position of having a flattened top and bottom, and wherein inflation of the tubular members results in the engagement of the restraint members with the upper and lower framework elements to form said rigid framework.