Re-entrant corner using corner formwork panels

This method describes the construction of a re-entrant corner in a GBE wall using corner formwork panels.

To make the method shown in this document easier to understand, the insertion of GBE spacers used with formwork systems incorporating tie rods has intentionally been omitted from the explanatory diagrams.

This method must be adapted as necessary to comply with the installation recommendations, particularly the safety requirements, specified by the suppliers of the equipment and materials used to construct a GBE wall.

Phase 0:

It is recommended to provide a starter at the base of the wall by leaving the concrete facing from the previous lift projecting. This will facilitate positioning of the formwork panels.

Phase 1:

Position the internal formwork panels and the internal corner formwork.
Install the structural reinforcement using conventional reinforced-concrete construction methods.

Phase 2:

Position the insulation panels with the GBE components assembled beforehand.
Leave an open space at the corner.

Phase 3:

Position the corner insulation panel.
Insert external connectors into the corner panel. Where an external connector does not connect to one of the insulation panels installed previously, fit an internal connector onto it.

Phase 4:

Install the reinforcement for the external concrete leaf.
Position the concrete placing hatch(es).
Position the external corner formwork and the external formwork panels, then tighten the complete formwork assembly in accordance with the formwork manufacturer's recommendations.
Place the concrete simultaneously on both sides of the insulation, for the external and internal concrete leaves.

Phase 5:

Strip the formwork.