Abstract: The invention relates to a freestanding wall section and a method of constructing a wall. The invention provides a wall section for use in building a wall comprising: a wall portion having a front face portion and a rear face portion; a connecting portion connecting said front face portion to said rear face portion and defining a cavity therebetween; in which the connecting portion has an aperture for receiving concrete mix and which in use allows the concrete mix to fill said cavity. The invention also provides a method of building a wall using such wall sections.

Abstract: A method for manufacturing hollow-core concrete slabs, the method comprising: preparing a mould by suspending in the mould between first and second end-pieces a plurality of substantially parallel elongate void formers; filling the mould with a wet concrete mix up to the crown of the void formers; laying an inert pliable filamentary sheet on the surface of the concrete with filaments of the sheet extending transverse to the long axes of the elongate void formers, the filamentary sheet being restrained so as to resist movement of the concrete mix when the void formers are withdrawn from the mix; further filling the mould with the wet concrete mix over the filamentary sheet; and, subsequently forming hollow channels in the wet concrete mix by withdrawing the plurality of void formers from the concrete mix through the second end-piece.

Abstract: The invention relates to a freestanding wall section and a method of constructing a wall. The invention provides a wall section for use in building a wall comprising: a wall portion having a front face portion and a rear face portion; a connecting portion connecting said front face portion to said rear face portion and defining a cavity therebetween; in which the connecting portion has an aperture for receiving concrete mix and which in use allows the concrete mix to fill said cavity. The invention also provides a method of building a walk using such wall sections.

Abstract: The present invention relates to a method and apparatus for manufacturing a moulded concrete unit. It is particularly although not exclusively applicable to moulding of a concrete unit suitable for use as a section for a freestanding wall. The invention provides a method for moulding a concrete unit having an aperture, comprising the steps of pouring concrete into a mould having walls substantially perpendicular to a base of the mould, and including a plurality of aperture defining walls; removing at least one of said aperture defining walls once the concrete is partially set; and removing the unit from the mould once the concrete unit is sufficiently set to allow removal. The invention also provides for use in such a method.