Specialist Structural Strengthening at the Sydney Opera House.

Slabtec delivered a complex package of structural strengthening and specialist post-tensioning works at the Sydney Opera House.

The project involved multiple strengthening methods across beams, columns and tie elements, requiring careful coordination between temporary works, permanent structural systems and the operational requirements of the building.

Scope of Works

A key component of the project was the installation of transfusable flat jacks to beams, columns and ties in more than 20 locations.

The flat jacks were initially activated through a temporary hydraulic system using hydraulic oil. This allowed the structural response to be monitored while the temporary works remained active. Once monitoring was complete and the required performance had been confirmed, the jacks were transfused with grout, converting them into permanent structural elements.

Slabtec’s works also included:

Installation of Sika CarboDur carbon fibre reinforcement to the soffits and tops of structural beams
Direct-bonded carbon fibre application without rebating into the existing concrete
Installation, stressing and grouting of multistrand post-tensioning systems within beams spanning approximately 20 metres
Installation of stress bars across multiple structural elements
Construction of a temporary tension tie system extending approximately 20 metres

Working Within a Controlled Environment

The carbon fibre installation required particularly careful environmental management.

All carbon fibre works were undertaken within a fully enclosed zip-wall containment system. This controlled the work area and prevented resin odours from transferring through the building’s ducting and ventilation systems.

The project demonstrates Slabtec’s capability to coordinate multiple specialist strengthening techniques within a highly controlled operating environment, including carbon fibre reinforcement, flat-jacking, multistrand post-tensioning and stress-bar systems.