Abstract: An insert for embedment in a concrete component during casting, having a tubular cavity for receiving a threaded anchorage member, the tubular cavity having an opening arranged to face outward of the concrete component when cast for insertion of the threaded anchorage member, wherein the insert is externally tapered such that, when the insert is embedded in the concrete component and the anchorage member is threadedly engaged within the tubular cavity, axial loading applied to the anchorage member in a sense to withdraw the anchorage member from the insert causes reactional force from the surrounding concrete to be applied to the insert in a direction radially inwardly of the insert, and wherein the insert is formed of deformable plastic material such that said reactional force in turn causes the insert to exert force radially inwardly upon the anchorage member.

Abstract: An insert for embedment in a concrete component during casting, having a tubular cavity for receiving a threaded anchorage member, the tubular cavity having an opening arranged to face outward of the concrete component when cast for insertion of the threaded anchorage member, wherein the insert is externally tapered such that, when the insert is embedded in the concrete component and the anchorage member is threadedly engaged within the tubular cavity, axial loading applied to the anchorage member in a sense to withdraw the anchorage member from the insert causes reactional force from the surrounding concrete to be applied to the insert in a direction radially inwardly of the insert, and wherein the insert is formed of deformable plastic material such that said reactional force in turn causes the insert to exert force radially inwardly upon the anchorage member.

Abstract: Method and arrangement for casting structures using form-work is disclosed applicable but no limited to on-site casting concrete construction panels for subsequent erection. Set back from form-work location are set-back buttresses (11) fixed to the work site surface. The set-back buttresses (11) support sliding risers (25-29) which can be secured in place relative to the set-back buttresses (11) and released and moved to and from the form-work location. The sliding risers (25-29) support form-work at the form-work location. A plurality of sliding risers (25-29) can be supported by the set-back buttresses (11) one above the other. In this way side-forms can be supported for structures of complex vertical profiles; for example, convex or concave walls, steps and stacks of construction panels may be moulded. Also disclosed are reusable side-forms which are supported by the sliding risers (25-29) and can be used as form work for construction panels.