Shaping structure, composite part comprising such a shaping structure, method for manufacturing such a composite part

A composite part comprising:

• (a) a shaping structure, comprising:
• (i) two shaping sheets comprising a first shaping sheet and a second shaping sheet facing each other at a distance from one another, wherein at least one shaping sheet of said two shaping sheets comprises a layer of nonwoven material;
• and
• (ii) a macroporous spacer sheet, comprising macropores, each macropore being a through-opening, the through-openings being distributed over the surface of the spacer sheet, the macroporous spacer sheet being arranged between the two shaping sheets and being corrugated in such a way so as to form a series of alternating even peaks and odd peaks distributed in a first direction of the shaping structure, at least one of the even peaks being attached to the first shaping sheet, at least one of the odd peaks being attached to the second shaping sheet, each peak attached in this way defining an attachment surface for attachment to the shaping sheet to which said peak is attached, wherein the macroporous spacer sheet comprises a grid of longitudinal threads and transverse threads connected at their intersections, the macropores being formed by the threads of the grid;
• and
• (b) a central layer, formed by a hardenable material, in a hardened state, wherein the central layer occupies the space between the two shaping sheets, wherein a shape of the central layer is delimited by the two shaping sheets, wherein the spacer sheet extends within the central layer, and wherein the hardenable material comprises concrete.