Structure and construction method
A core wall structure is assembled by attaching together elements of lightweight thermal insulation material ( 16 ) and elements of mineral board ( 20 ), positioned between them to serve as webs ( 20 ) at spaced intervals. Opposing edges ( 22 ) of the webs ( 20 ) are exposed on outer surfaces ( 26,28 ) of the core wall structure, with recesses ( 24 ) around them. Skins ( 18 ) of cement-based plaster are applied to the outer surfaces ( 26,28 ) to cover the core wall structure at least in part and to embed the exposed edges ( 22 ) of the webs ( 20 ) at least in part in the cement-based plaster.
1. A structure comprising:
a core wall structure comprising elements of lightweight thermal insulation material and rigid mineral boards, said core wall structure having two opposing outer surfaces and at least some of said rigid mineral boards being positioned between the elements of lightweight material at spaced intervals to extend transversely across the core wall structure, with opposing edges of the mineral boards being exposed on the opposing outer surfaces of the core wall structure; and
skins of cement-based plaster extending on the opposing outer surfaces of the core wall structure to cover opposing sides of core wall structure at least in part;
wherein the exposed edges of the mineral boards are embedded at least in part in the skins of cement-based plaster on the opposing sides of the core wall structure, each of the mineral boards forming a rigid structural connection between the opposing skins of cement-based plaster wherein edges of the elements of lightweight thermal insulation material are recessed adjacent the exposed edges of the mineral boards, to provide space for the reinforcement of the skins of cement-based plaster.
2. The structure according to claim 1 , wherein the skins of cement-based plaster are reinforced around the exposed edges of the mineral boards, where said exposed edges are embedded in the skins of cement-based plaster.
3. The structure according to claim 1 , further comprising reinforcement embedded in the skins of cement-based plaster.
4. The structure according to claim 3 , further comprising fibre reinforcement embedded in the skins of cement-based plaster.
5. The structure according to claim 3 , further comprising elongate tensile elements embedded within at least one of the skins of cement-based plaster, said tensile elements being aligned with the mineral boards.
6. The structure according to claim 5 , wherein at least some of said tensile elements extend within one of the skins of cement-based plaster in close proximity to one of the embedded edges of one of the mineral boards.
7. The structure according to claim 5 , wherein the skin of cement-based plaster is reinforced around the tensile elements.
8. The structure according to claim 5 , wherein the tensile elements are made of basalt.
9. The structure according to claim 1 , wherein the lightweight thermal insulation material is expanded polystyrene.
10. The structure according to claim 1 , wherein the mineral boards comprise magnesium oxide board.