Rail Bridge Deck Renewal
Sterling designed and renewed 330 metres of timber decking with an engineered steel deck system on a critical dual-gauge rail bridge, extending operational life by 50 years through innovative construction methodology that minimised disruption to busy train services.
Challenge
The Moonee Ponds Creek Bridge required renewal of the deteriorated timber decking on a critical section of the Albion-Jacana rail line carrying both standard and dual gauge tracks. The existing timber deck and kerb systems had reached end-of-life, with typical corrosion also affecting the supporting steel cross girders and RSJ beams. The bridge's 330m length, live rail environment with high train frequency, and limited access points created substantial logistical and safety challenges. Working within an active rail corridor required innovative safeworking arrangements to balance construction productivity with minimal disruption to train services on an already congested network. The solid web main girders prevented mid-span access between external and internal work areas, complicating emergency rescue procedures for workers on scaffold beneath the deck.
Solution
Sterling developed a comprehensive engineering solution featuring custom-designed steel trough deck panels (5 types) and derailment kerb assemblies engineered to AS5100 standards for RAS210 locomotive loading with 50-year design life. The design incorporated hot-dip galvanized structural steel components with detailed connection systems including deck clips, packer plates, and joining plates to accommodate existing bridge geometry and corrosion repairs. Sterling implemented a phased construction methodology across 12 weekly blocks, working Friday to Tuesday in 24/7 operations to maximize track possession efficiency. A specialized rail safeworking strategy combined Absolute Occupation on the work track with Track Force Protection on the running line, utilizing multiple TFPC personnel (3.3, 3.2, and 3.1 levels) and handsignallers to enable hi-rail equipment repositioning between train movements, significantly reducing network controller workload compared to traditional track warrant approaches. Comprehensive scaffold systems with external wing and internal center access were designed with detailed rescue procedures addressing the bridge's access constraints. Surface treatment protocols for existing corroded steel included wire brushing/abrasive blasting, zinc-rich primer application (minimum 125μm thickness), and epoxy putty repairs for section loss areas.
Planned Deliverables
Sterling delivered a complete civil structural drawing package (10 sheets: GRY_C1010-C1019) including drawing index, locality plan, general notes, general arrangements, trough deck details (5 panel types with quantities), kerb details (6 vertical kerb types, 5 kerb wall types across 12 segments), deck clips and joining plate specifications. Detailed fabrication specifications covered structural steel grades (AS3678 Grade 250L0/300L0, AS/NZS 3679.1 Grade 300L0/450+), welding requirements (AS1554, EXX49 electrodes), bolting procedures (grades 4.6/S through 10.9/TB including Huck bolts), and hot-dip galvanizing standards (AS1214, AS4680, AS4791, AS4792). Rail safeworking documentation included Track Force Protection implementation plans with resource allocation and Working at Heights Rescue Plan addressing scaffold emergency procedures. Construction supervision and interface management services coordinated works with ARTC operations, network control, and stakeholder engagement across the 12-week program.
Expected Outcomes
The project successfully replaced 330m of deteriorated timber rail deck with engineered steel trough deck and derailment kerb systems, extending the bridge's operational life by 50 years while meeting current AS5100 loading standards for RAS210 locomotives. Sterling's innovative Track Force Protection safeworking approach minimized disruption to train services on the busy Albion-Jacana corridor, reducing network controller workload and construction downtime between track possessions compared to traditional warrant-based methods. The phased 12-block construction program enabled systematic progression while maintaining rail operations, with each 60m section completed within weekly Friday-Tuesday possessions. Comprehensive corrosion repairs and protective coating systems addressed existing steel deterioration, ensuring structural integrity of supporting elements. The project demonstrated Sterling's capability to deliver complex rail infrastructure renewal within live corridor constraints, integrating structural design, construction methodology, rail safeworking planning, and safety management to achieve client objectives for this high-priority ARTC asset.
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