| 摘要 |
The vanes used (11) are of thin plate, and have longitudinal parts for the pile inner central part which locate against at least one adjacent vane component (14). Such vane components are joined to one another at the pile central part. The parts (16,17) of the pile are at least partly inset in the central part of the vane components which are bent to form U, V or L-shaped profiles. The arms of these profiles form the actual vanes of the pile, and at least sections of the parts which join the arms together are connected with corresp. parts in adjacent vane components. The vane components (14) can also be bent to form Z-profiles, one flange (11) of each profile forming a vane. The body of the profile is connected by a flange to another vane component located on its one side. The other flange of the profile is connected by the body to a third vane component (14) located on its other side. |
