Bridge 0930 - Haydn Bunton Drive over Urban Railway
Enviro undertook work on MRWA Bridge 0930 – Haydn Bunton Drive in Subiaco, working closely with the Public Transport Authority & Main Roads WA to perform multiple scopes of work. We were presented with the Category 1 award from CCFWA for this project. The scope is described below:
- Full Traffic Management Plan & mobilisation of traffic control devices
- Submission of Rail Safety Management, Environmental Management, Safety Management Plans to relevant authorities – provision of rail safety personnel.
- Design and installation of earthing and bonding systems
- Engineering design & verification, fabrication and erection of temporary rail protection screens
- Removal of existing rail protection screens and existing precast concrete footpaths
- Form up & pour new cast in situ concrete footpaths with reinforcement bars
- Fabrication of new rail protection screens, guard-railing, W Beams, and balustrades with isolation panels as per MRWA specifications
- Profiling of approach slabs and installation of new asphalt surface to approach slabs and bridge deck.
Due to the high-profile project location in the heart of Subiaco, adjacent to Domain Stadium and over the urban rail network, this project required a contractor experienced in operating in high risk, high compliance rail environments yet adaptable enough to use innovative construction techniques. The initial scope of works included the removal of existing steel rail protection screens and the removal of the bridge parapet beams over the live rail network, just metres from the 25KVA overhead live equipment (OLE). This posed a huge HSE risk to project staff and risked damage to the OLE and widespread disruptions to the public transport network. We designed, fabricated and installed a custom bridge clamp system which was fitted with access walkways and a temporary rail protection hoarding. The system was installed under an Enviro controlled rail shutdown to allow hi-rail EWPs access to the track infrastructure. This system was earthed and bonded and formed a barrier between the worksite and the OLE allowing the existing rail protection screens to be removed during live rail movements. Ancillary drainage (slurry control) was fitted to the system allowing for civil works and concrete cutting to be undertaken simultaneously. MRWA advised us that it was the first time any such system had been used in the state, if not the country. Our internal rail safety personnel constantly monitored the rail reserve and communicated with PTA train control and engineering staff to plan rail shutdowns as required. Approval times for rail shutdowns were more than 6 weeks – meaning the project construction schedule had to match the pre-booked isolations and shutdown exactly, and delays were not an option. Due to the age and condition of the bridge, there was a lack of accurate as-con drawings showing reinforcing locations within the bridge beams and parapets. We undertook a detailed dilapidation report and services scanning of the bridge to locate and identify reinforcing and drainage systems prior to drilling and installing the bridge clamp system. These works had to be undertaken during a rail shutdown and OLE isolation. After identifying several significant cost and time saving measures, including changing the precast concrete footpath elements to poured-in-situ, and the design and development of the temporary rail protection screens and bridge clamping system we allowed Main Roads to expand the scope of work to include the profiling and resurfacing of the bridge deck, expansion of the paving repairs, additional ancillary works and landscaping not originally allowed for in the tender bill of quantities.
Please click here for a link to the CCFWA website: http://www.ccfwa.com.au/wp-content/uploads/2017/08/Enviro.pdf