Vertical formwork comprising at least - two formwork panels (4, 5) arranged facing one another, - an anchor (2, 3) fixed to each of said formwork panels (4,5) respectively, and - a tie rod fixed to each anchor (2, 3) of each of the formwork panels (4, 5), - each anchor (2, 3) comprising ∘ a housing (24, 34) receiving a part of the tie rod fixing the two formwork panels (4, 5), the housing (24, 34) comprising a tubular extension (22, 32), and ∘ sealing means sealing the anchor (2, 3) with respect to the formwork panel (4, 5) in which it is fixed and with respect to the tie rod housed in the housing (24, 34) of the anchor (2, 3), characterized in that ∘ the sealing means comprise a single sealing element (23, 33), said sealing element (23, 33) being a rubber gasket which is arranged at one end (222, 322) of the tubular extension (22, 32) of the anchor (2, 3), and ∘ said sealing element (23, 33) sealing both the anchor (2, 3) with respect to the formwork panel (4, 5) in which it is fixed and the anchor (2, 3) with respect to the tie rod housed in the housing (24, 34) of the anchor (2, 3), ∘ wherein the sealing element (23, 33) comprises a sealing ring (235, 335), said sealing ring (235, 335) comprising an outer wall (235a, 335a) supported against the formwork panel (4, 5), and ∘ wherein the sealing element (23, 33) comprises an end ring (236, 336) supported against the tie rod housed in the anchor (2, 3), such that the anchor (2, 3) is sealed with respect to the tie rod. - two formwork panels (4, 5) arranged facing one another, - an anchor (2, 3) fixed to each of said formwork panels (4,5) respectively, and - a tie rod fixed to each anchor (2, 3) of each of the formwork panels (4, 5), - each anchor (2, 3) comprising ∘ a housing (24, 34) receiving a part of the tie rod fixing the two formwork panels (4, 5), the housing (24, 34) comprising a tubular extension (22, 32), and ∘ sealing means sealing the anchor (2, 3) with respect to the formwork panel (4, 5) in which it is fixed and with respect to the tie rod housed in the housing (24, 34) of the anchor (2, 3), ∘ a housing (24, 34) receiving a part of the tie rod fixing the two formwork panels (4, 5), the housing (24, 34) comprising a tubular extension (22, 32), and ∘ sealing means sealing the anchor (2, 3) with respect to the formwork panel (4, 5) in which it is fixed and with respect to the tie rod housed in the housing (24, 34) of the anchor (2, 3), ∘ the sealing means comprise a single sealing element (23, 33), said sealing element (23, 33) being a rubber gasket which is arranged at one end (222, 322) of the tubular extension (22, 32) of the anchor (2, 3), and ∘ said sealing element (23, 33) sealing both the anchor (2, 3) with respect to the formwork panel (4, 5) in which it is fixed and the anchor (2, 3) with respect to the tie rod housed in the housing (24, 34) of the anchor (2, 3), ∘ wherein the sealing element (23, 33) comprises a sealing ring (235, 335), said sealing ring (235, 335) comprising an outer wall (235a, 335a) supported against the formwork panel (4, 5), and ∘ wherein the sealing element (23, 33) comprises an end ring (236, 336) supported against the tie rod housed in the anchor (2, 3), such that the anchor (2, 3) is sealed with respect to the tie rod.