VERTICAL MOULDING OF LONG CONCRETE ARTICLES

摘要

Vertical moulds are provided for making concrete pipes poles or piles. The mould can be opened along its length and has an internal flexible rubber or polymer liner (5) in which the edges of the mould shell (63), that seal together when the mould is closed, incorporate a sealing strip (51) bonded to the mould liner (5) and supported on flanges (53) running parallel to the edges of the mould shell the attachment of the sealing strip (51) to the flanges (53) being arranged to allow the sealing strip (51) to follow the movement of the mould liner (5) during opening of the mould and removal of the moulded article. When moulding long hollow concrete articles of constant cross section an expandable core is used which can be contracted to allow easy removal of the articles of constant cross section from the mould. Also disclosed is a method of moulding long concrete articles in which an homogenous concrete mixture is subjected to a moulding pressure above (5) bar in the absence of vibration. The method is adaptable to making hollow poles or piles of annular non circular cross section especially elliptical poles or piles or poles with a rectangular base an elliptical body section and a circular top section.