(57) Hollow, interengaging mould units 10 are built-up to provide a hollow mould for a
retaining, or other, wall. The hollow mould is filled with a flowable composition
such as concrete. Some lower units 40 may have side apertures through which a first
portion of concrete flows to form footings 44 for the wall. A ring beam of a retaining
wall may beformed similarly by use of apertured upper units 40.
The mould units 10,40 are each generally cuboid and have apertured tops, bottoms and
opposed ends. An upstanding collar on each unit fits inside the lower walls of another
unit in building the hollow mould. Each mould unit may comprise two orthree sub-units
which are square in plan to allow a mould having right-angled corners to be made.
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