| 摘要 |
A process for manufacturing concrete wall blocks front face up, the wall blocks, with respect to orientation in a wall, having the front face moulded with a predetermined three-dimensional pattern, an opposite rear face, top and bottom opposite faces extending between the front and rear faces, and side faces extending between the front and rear faces and the top and bottom faces, the process comprising the steps of: moulding a concrete wall block by depositing a dry cast concrete mixture into a mould 20, the mould 20 being positioned upright and having two parallel mould sidewalls 22 and two mould end walls 24 perpendicular to the two mould sidewalls 22, the upright mould 20 having an open top and an open bottom, the upright mould 20 being positioned on a pallet so that the open bottom is closed by the pallet; forming the concrete wall block side faces by compacting the dry cast concrete mixture against the mould sidewalls 22; forming the concrete wall block rear face by compacting the dry cast concrete mixture against the pallet; forming one or the concrete wall block top or bottom face by compacting the dry cast concrete mixture against a face region of a first division plate 26 that is rigidly constrained during operation of the process, the division plate 26 having side edges; the side edges of the first division plate 26 being rigidly constrained within a channel in each of the mould sidewalls 22, the channels being parallel to each other and generally perpendicular to the open top and open bottom of the mould 20; the first division plate 26 being rigidly constrained by securing each of the side edges to each of the mould sidewalls 22 at a plurality of separate locations by a bolt at each of the plurality of separate locations, each bolt extending through a mould sidewall and being threaded into a side edge of the first division plate 26; forming the other top or bottom face of the concrete wall block by compacting the dry cast concrete mixture against a face region of a wall or plate that is opposite to the first division plate 26; forming the concrete wall block front face by compacting the dry cast concrete mixture with a stripper shoe in the open top of the mould 20 to impart a predetermined three dimensional pattern to the concrete wall block front face, the predetermined three-dimensional pattern having a relief of at least about 0.5 inch; stripping the concrete wall block from the open bottom of the mould 20 onto the pallet; and curing the concrete wall block to result in a cured concrete wall block.
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