Abstract: Improvements in the construction of buildings is described using prefabricated panels provided with insulation material arranged in pairs. Couplying structure secures the panels to a base and to other panels. Concrete fills the hollow space between the pair of panels.

Abstract: A modular structure for a prefabricated building includes prefabricated modules connected by dowel type fasteners. The fasteners include a dowel element with a diverging frustum of cone sectors which form heads at each end of the dowel and set screw fasteners which have a frustum of the cone front end which bears on the frustum portion of the dowel. The dowel fits in opposing holes in the panel edges and the set screws are inserted in blind holes which lead into the dowel receiving holes.