The invention relates to a tool for preforming a fibrous preform comprising: a first membrane (11) inflatable and intended to receive the fibrous preform, a second membrane (18) intended to be fixed via a fastening system (20) on the first membrane (11) and so as to form an internal cavity (19) sealed between the first and the second membrane, and a vacuum device ( 25) of the internal cavity between the first membrane (11) and the second membrane (18). Figure for abstract: figure 3
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