Abstract: Apparatus is provided for arch centering for slabs formed on prefabricated beams of reinforced or prestretched concrete, steel, wood, or the like, which includes elements of steel plate or another material having similar properties, constructed in a flat or arched form and with the dimensions that are required, which has four or more steel staples for its temporary support during its use, and two devices, one of which allows the staples to be slightly deformed in an elastic manner for their extraction and another for their leveling and coupling among themselves.