| 摘要 |
<p>A concrete mix containing fibres is sprayed onto a surface 12 of a female mould 10 to form a thin layer 13. Preferably, a male mould 14 is then inserted over the layer of wet concrete and a thin layer 15 of concrete is sprayed onto the male mould 14 to form a beam or spar which is integral with the layer 13 applied to the female mould 10. A monolithic concrete element is thus produced. Another such element is similarly formed and the two elements are cemented together to form a tubular structure, e.g. a rotor blade for a wind turbine. Reinforcement rods may be incorporated, e.g. in the two beams or spars, and placed in tension to place the structure in compression. <IMAGE></p> |
