A formwork for the production of concrete articles includes: a supporting beam with a development axis; a panel which has an outer surface designed to be in contact with a concrete casting, the panel being connected on an inner side to the beam and being curvable around a transverse direction relative to the development axis of the beam; and a connector, present in the area of one end of the beam, allowing connection of the beam to another structure. The connector includes: a slide connected to the beam to perform a translation or rotation movement, or both, the slide carrying a first fastener connecting the beam to another adjacent beam, and a second fastener connecting the beam to a supporting structure; and an adjustment mechanism which acts on the slide to move it continuously between a retracted position and an extended position, adjusting its position relative to the beam.