Spacer device for formwork
A spacer device ( 10 ) for formwork, comprising a hollow tubular body ( 2 ) extending around a longitudinal axis (X-X) is described, said tubular body ( 2 ) being configured to house a cross tie rod ( 7 ) and comprising: two side tubular portions ( 2 a, 2 b ); each side tubular portion ( 2 a, 2 b ) comprising fastening means at one end; and at the remaining end, a tapered portion ( 3 a, 3 b ) configured to rest on the wall of the formwork; characterised by comprising a ball joint ( 5 a, 5 b ) interposed between each tapered portion ( 3 a, 3 b ) and the respective side tubular portion ( 2 a, 2 b ) to couple each tapered portion ( 3 a, 3 b ) with the respective side tubular portion ( 2 a, 2 b ).
1. A spacer device ( 10 ) for formwork of the type comprising two formwork panels arranged so that they face each other; each panel having an inner wall ( 20 , 21 ) and an outer wall, the inner wall being the one intended to contact the concrete, said spacer device comprising a hollow tubular body ( 2 ) extending around a longitudinal axis (X-X), said tubular body ( 2 ) being configured to house a cross tie rod ( 7 ), said spacer device comprising:
two tapered portions ( 3 a , 3 b ) configured to rest on the inner walls ( 20 , 21 ) of the formwork;
two side tubular portions ( 2 a , 2 b );
each side tubular portion ( 2 a , 2 b ) comprising an inner end including fastening means and an outer end configured to rotatably engage said tapered portion ( 3 a , 3 b );
said fastening means comprising a section-reduced portion ( 17 ) of said inner end of said side tubular portion and a plurality of radially projecting longitudinal ribs ( 9 ),
said spacer device being characterised by a ball joint ( 5 a , 5 b ) formed at the outer end of the respective side tubular portion ( 2 a , 2 b ) to couple each tapered portion ( 3 a , 3 b ) with the respective side tubular portion ( 2 a , 2 b ),
said ball joint ( 5 a , 5 b ) being integral with the side tubular portion ( 2 a , 2 b ) and being placed in rotating engagement with the respective tapered portion ( 3 a , 3 b ).
2. The spacer device ( 10 ) for formwork according to claim 1 , characterised in that each ball joint ( 5 a , 5 b ) comprises a first curvilinear surface ( 13 ) arranged at said outer end of said side tubular portion ( 2 a , 2 b ) and a second curvilinear surface ( 14 ) provided on the tapered portion ( 3 a , 3 b ); said first curvilinear surface ( 13 ) having a curvature substantially corresponding to that of said second curvilinear surface ( 14 ) so as to rotatably couple said tapered portion ( 3 a , 3 b ) with said side tubular portion ( 2 a , 2 b ).
3. The spacer device ( 10 ) for formwork according to claim 1 , characterised in that said tubular body ( 2 ) comprises a central tubular portion ( 4 ) disposed between the inner ends of said two side tubular portions ( 2 a , 2 b ).
4. The spacer device ( 10 ) for formwork according to claim 2 , characterised in that said tubular body ( 2 ) comprises a central tubular portion ( 4 ) disposed between the inner ends of said two side tubular portions ( 2 a , 2 b ).
5. The spacer device ( 10 ) for formwork according to claim 3 , characterised in that said fastening means are shaped to removably couple said side tubular portion ( 2 a , 2 b ) to said central tubular portion ( 4 ).
6. The spacer device ( 10 ) for formwork according to claim 4 , characterised in that said fastening means are shaped to removably couple said side tubular portion ( 2 a , 2 b ) to said central tubular portion ( 4 ).
7. The spacer device ( 10 ) for formwork according to claim 3 , characterised in that said tapered portion ( 3 a , 3 b ) comprises a support base ( 15 ) adapted to define a lying plane (α).
8. The pacer device ( 10 ) for formwork according to claim 4 , characterised in that said tapered portion ( 3 a , 3 b ) comprises a support base ( 15 ) adapted to define a lying plane (α).
9. The spacer device ( 10 ) for formwork according to claim 7 , characterised in that said ball joint ( 5 a , 5 b ) is configured to allow an inclination of said lying plane (a) of less than 45° with respect to a vertical direction.
10. The spacer device ( 10 ) for formwork according to claim 2 , characterised in that said side tubular portions ( 2 a , 2 b ) have substantially equal extension along said longitudinal axis (X-X).
11. The spacer device ( 10 ) for formwork according to claim 3 , characterised in that said side tubular portions ( 2 a , 2 b ) have substantially equal extension along said longitudinal axis (X-X).
12. The spacer device ( 10 ) for formwork according to claim 1 , characterised in that each tapered portion ( 3 a , 3 b ) is arranged outwardly of said ball joint ( 5 a , 5 b ) while each side tubular portion ( 2 a , 2 b ) is arranged inwardly of said ball joint ( 5 a , 5 b ).
13. The spacer device ( 10 ) for formwork according to claim 2 , characterised in that each tapered portion ( 3 a , 3 b ) is arranged outwardly of said ball joint ( 5 a , 5 b ) while each side tubular portion ( 2 a , 2 b ) is arranged inwardly of said ball joint ( 5 a , 5 b ).
14. The spacer device ( 10 ) for formwork according to claim 1 , characterised in that said fastening means comprise longitudinal cuts ( 11 ) arranged laterally to said longitudinal ribs ( 9 ).
15. The spacer device ( 10 ) for formwork according to claim 14 , characterised in that said longitudinal rib ( 9 ) has a height, measured in a radial direction, which is variable along its extension.
16. The spacer device ( 10 ) for formwork according to claim 1 , characterised in that said side tubular portions ( 2 a , 2 b ) have substantially equal extension along said longitudinal axis (X-X).