method and apparatus of the exterior surface of the coating betonikerroksella elongated ellipse)

摘要

PCT No. PCT/DK91/00026 Sec. 371 Date Jul. 20, 1992 Sec. 102(e) Date Jul. 20, 1992 PCT Filed Jan. 29, 1991 PCT Pub. No. WO91/11653 PCT Pub. Date Aug. 8, 1991.An apparatus for coating the outer surface of an elongated body (10), such as a rod or tube, with a layer of concrete (30) includes a frame structure (21). Pipe or tube sections (10) may be supplied to a tilting device (27) in a horizontal position on a carriage (12) and tilted to a vertical position within the tower-like frame structure (21). The apparatus comprises means (24, 27) for retaining the elongated body (10) in the upright position within the frame structure and an annular mould (26) for surrounding the upright elongated body so as to define an annular space between the elongated body and the annular mould, and concrete may be fed to the annular mould space by feeding means (28, 29). The mould may include an upper funnel-like part, which is rotatable about the axis of the annular mould relative to the remaining part of the mould so as to distribute the concrete mixture peripherally in the annular mould space. The moulded concrete layer may be exposed to vacuum by means of a skirt-like vacuum chamber, whereby free water may be withdrawn from the concrete layer.