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29 Jul 2010
Scope of Works
The reason for the carrying out the scope of works was due to severe concrete spalling in areas as a result of salt containing winds from the nearby harbour. Other project works included the erection of scaffolding, tiger tailing to electrical cables, masonry demolition works, brick reinforcing works (with the Helifix system), waterproofing and tiling works, rendering work, construction of new balustrade works, glazing works and painting works.
Each balcony on the building required to remedial works, including demolition, remedial (repairs to concrete spalling) and construction works completed. Protection access tower scaffolding was erected in front of each balcony stack to provide safe access without disturbing the residents in each unit. The scaffold towers were wrapped in chain wire mesh and shade cloth to ensure the security of the building was maintained for the duration of the works.
Safety and Stakeholders
The project was undertaken on a live unit block near Sydney Harbour. As the project was to be completed in an occupied building it was imperative to implement and maintain good OHS and Environmental work practices.
All works were executed externally hence we did not require internal access to the units during the project. Murphy’s Site Manager did however liaise daily with the residents to ensure they were happy with the progression of works and the harmonious nature of the site was maintained.
The erection of the scaffolding not only provided a safe working platform for the works but also ensured the residents were affected by the project.
Benefits to Client During Works
- Residents disturbed to a minimum with the erection of the scaffolding towers for works to proceed
- Security of the building & each Unit maintained for the duration of the project
- Able to complete all works externally – access to the internal areas of the building not required
- Able to carry out additional works as requested by the client
- Murphy’s site manager onsite at all times to ensure programme & client requirements were adhered to
- Development and implementation of Site Specific Management Plan
- Completed project without any OHS, Quality and/or Environmental issues
Project Methods
The project was initiated after a completed diagnostic building report identified that the existing balconies were suffering from concrete spalling. Some of the balconies were so bad that structural integrity was beginning to fail. The building is located within a couple hundred metres of the Harbour and so is exposed to a marine environment and subjected to salt winds. With the building being a live residential unit block, it was paramount that the balconies were made safe and compliant and disruption to residents kept to a minimum.
Upon the completion of the erection of the scaffold towers, the brick balustrades to each affected balconies were deconstructed and removed from site. This was a ‘Hold Point’ in where the superintendent identified and marked out the spalling areas to be rectified.
Once identified, we commenced with the demolition and removal of the defective concrete. The concrete was removed with jackhammers and grinders as required. We programmed the demolition works in consultation with the client so that these noisy works were completed at appropriate convenient times.
The project being a remediation of concrete spalling meant that ‘Hold Points’ and inspections throughout were essential in ensuring the works were completed in accordance with the manufactures requirements, engineers instructions and relevant Australian Standards.
All concrete remedial works were programmed & executed with the appropriate ‘Hold Points’ to ensure works were completed to the highest degree of quality.
Upon the completion of the removal of the concrete, the steel reinforcement was treated as required in accordance with the requirements of the supervising engineer for the project. Where required the steel reinforcement was replaced with new galvanised bars. This was then another ‘Hold Point’ on the project before the reinstatement of the new protective concrete/repair mortar.
The new concrete repair works were finished neatly and flush with the adjacent concrete surfaces so that the evidence of the concrete spalling repair works was minimal. This again was a ‘Hold Point’ for the inspecting engineer so it could be verified that the completed repair works were to high quality & client requirements.
Upon the completion of the repairs to the concrete spalling works the rendering and painting works were completed. Other project works were carried out by our trade qualified employees such as brickwork and structural upgrading of the blade brick walls with Helifix ties.
Due to the works on the project, they were required to be programmed and executed sequentially (for example spalling works, rendering, painting etc.). Murphy’s project manager programmed the works with on and off site contractors & suppliers to ensure works were completed to high quality as required.
The final work on the project was the supply and installation of new aluminium balustrades with glass inserts. The new balustrades were measured onsite & fabricated off site as appropriate and powdercoated. The aluminium balustrades were installed in sections and the new glazing placed and sealed.
All works were reviewed by the inspection engineer (superintendent) and the client's representative. Once it was determined that all works had been completed to high quality, Murphy’s proceeded to clear off site.
The scaffold access towers were dismantled followed by a complete site clean up.
No defects were found in the project with the successful implementation of our onsite quality management system. Project works were also completed without any OHS and Environmental issues.
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