Variable-geometry spacing connector for formwork and modular formwork system including such connector

A variable-geometry spacing connector made up of at least one crosspiece, said crosspiece being connected at both of opposite ends of said crosspiece, with at least one respective connection portion suited to make a connection with at least one panel of a formwork, wherein said spacing connector also includes at least one transpiration duct featuring two respective end openings, each of said end openings leading to a respective said connection portion, said transpiration duct being equipped with at least one check device suited to act in favour of a pressure difference existing between said end openings, wherein said transpiration duct is made up of at least one first partition, including one first half of said duct, connected with at least one second partition, including one second half of said duct, by placing at least one hinged mechanism therebetween.