| 摘要 |
A design by which tubular cardboard components are used to form moulds which have a constant non-circular cross-section. The walls of the tubular cardboard moulding component (11) are supported by an adjusting system of synthetic foam or cardboard, by, for example, cylindrical cardboard tubes (13, 14) longitudinally positioned, which prevent the walls from buckling under pressure from the substance being moulded. These tubes are supported by an external cardboard tube (12). Similar means of support are provided within a cross-sectionally polygonal cardboard tube, for moulding a cavity or forming a hollow cardboard construction. Application in the moulding of concrete or the moulding of any other substance which sets into a solid mass. |
