Vertical formwork comprising at least - one front formwork panel and one rear formwork panel which are arranged facing one another, - one rear anchor fixed to the rear panel, - one front anchor fixed to the front panel, and - one tie rod comprising a threaded end and fixed to the front anchor and to the rear anchor, the rear anchor comprising - a support configured for being fixed to the rear formwork panel, and - a nut coupled to said support such that the nut can be oriented with respect to said support, - the nut comprising a threaded hole configured for housing the threaded end of the tie rod, characterized in that - the nut is made in one piece, - the threaded hole of the nut of the rear anchor comprises a first segment with an internal thread with a first core diameter (Dn 1) and a second segment with an internal thread with a second core diameter (Dn 2), the first core diameter (Dn 1) being greater than the second core diameter (Dn 2), and - the tie rod is selected from ∘ a first type of tie rod with a threaded end with an external thread configured for being fixed to the first segment of the threaded hole, said tie rod of the first type being screwed into the internal thread of the first segment, and ∘ a second type of tie rod with a threaded end with an external thread configured for being fixed to the second segment of the threaded hole, said tie rod of the second type going through the first segment and being screwed into the internal thread of the second segment. - one front formwork panel and one rear formwork panel which are arranged facing one another, - one rear anchor fixed to the rear panel, - one front anchor fixed to the front panel, and - one tie rod comprising a threaded end and fixed to the front anchor and to the rear anchor, - a support configured for being fixed to the rear formwork panel, and - a nut coupled to said support such that the nut can be oriented with respect to said support, - the nut comprising a threaded hole configured for housing the threaded end of the tie rod, - the nut is made in one piece, - the threaded hole of the nut of the rear anchor comprises a first segment with an internal thread with a first core diameter (Dn 1) and a second segment with an internal thread with a second core diameter (Dn 2), the first core diameter (Dn 1) being greater than the second core diameter (Dn 2), and - the tie rod is selected from ∘ a first type of tie rod with a threaded end with an external thread configured for being fixed to the first segment of the threaded hole, said tie rod of the first type being screwed into the internal thread of the first segment, and ∘ a second type of tie rod with a threaded end with an external thread configured for being fixed to the second segment of the threaded hole, said tie rod of the second type going through the first segment and being screwed into the internal thread of the second segment. ∘ a first type of tie rod with a threaded end with an external thread configured for being fixed to the first segment of the threaded hole, said tie rod of the first type being screwed into the internal thread of the first segment, and ∘ a second type of tie rod with a threaded end with an external thread configured for being fixed to the second segment of the threaded hole, said tie rod of the second type going through the first segment and being screwed into the internal thread of the second segment.