Case Study
T2T — Torrens to
Torrens Alliance
Adelaide motorway works (representative)
Project Overview
The Torrens to Torrens (T2T) project delivered a 3-kilometre lowered motorway section along South Road between the River Torrens and Torrens Road, forming a critical link in Adelaide's North-South Corridor. Delivered through an alliance model between York Civil, CPB Contractors, Aurecon, and the Department of Planning, Transport and Infrastructure (DPTI), the project involved lowering South Road below the existing surface, constructing new bridge structures at Hawker Street and the Outer Harbour rail corridor, and relocating major trunk services that traversed the alignment.
Jerome served as Construction Manager for all bridge and structural elements, holding direct responsibility for the construction delivery of the Hawker Street overpass bridge, the Outer Harbour Rail Bridge, retaining wall systems along the lowered motorway, and all structural concrete elements within the corridor. This encompassed managing construction crews, coordinating crane operations, overseeing concrete placement programmes, and directing service relocation works that intersected with structural construction zones.
The service relocation scope alone presented project-within-a-project complexity: SAPN high-voltage cable diversions, Telstra telecommunications conduit relocation, SA Water trunk main protection works, and APA Gas pipeline realignment all had to be completed within tightly sequenced windows before structural construction could commence in each zone. Jerome managed these interfaces across four separate utility owners, each with their own design approval processes, shutdown requirements, and construction standards.
2015-2016 — Common Service Trench Works
Common Service Trench Coordination
On T2T I ran the Common Service Trench (CST) works on South Road in coordination with every utility owner and live traffic stakeholder.
- Coordinated SAPN, NBN, TELSTRA, APA Gas, DPTI Electrical / Comms / ITS, SA Water Stormwater, Sewer and Water Main installations in congested urban corridors
- Managed day and night crews simultaneously to keep the program moving without compromising traffic conditions
- Organised traffic closures, NDDs (non-destructive digging), conduit supply and installation, service-provider access permits
- Owned the commissioning and decommissioning of services as the corridor handed over from old to new alignment
Scope of Work
JCY delivered construction management services across the following work packages:
- Construction management of the Hawker Street overpass bridge from foundations through to deck completion
- Outer Harbour Rail Bridge construction including piling, abutments, headstocks, and precast deck installation
- CST (cable support trough) conduit system installation along the full lowered motorway corridor
- SAPN high-voltage cable diversion coordination, including live cable protection during adjacent excavation
- Telstra telecommunications conduit relocation across multiple construction zones
- SA Water trunk main protection works and temporary supply maintenance during service crossings
- APA Gas pipeline realignment coordination with gas network shutdown scheduling
- Retaining wall construction management along the lowered motorway alignment
- Concrete placement programme management for all structural elements
- Crane operation coordination for precast element lifts and steel erection
- Structural quality management including hold point inspections and test result verification
Key Challenges & Solutions
Multi-Utility Service Relocations
Four major utility owners — SAPN, Telstra, SA Water, and APA Gas — each required service relocations within overlapping construction zones, with different approval timelines, shutdown requirements, and construction standards. Any delay in a single utility relocation would cascade through the structural construction programme. Jerome developed an integrated service relocation schedule that mapped critical path dependencies across all four utilities, negotiated consolidated shutdown windows where multiple relocations could proceed simultaneously, and established weekly interface meetings with utility owner representatives to track progress and resolve access conflicts before they impacted the bridge construction programme.
Rail Bridge Over Live Corridor
The Outer Harbour Rail Bridge had to be constructed over an active freight and passenger rail corridor with extremely limited possession windows. Piling operations adjacent to the rail corridor required vibration monitoring and real-time track geometry checks to ensure rail alignment was maintained. Jerome coordinated with ARTC and Adelaide Metro for possession scheduling, pre-fabricated bridge components to maximise work completed outside possessions, and staged the construction sequence to complete all over-track lifts within a single extended weekend possession, eliminating the risk of partially completed spans over live tracks.
3km Lowered Motorway Staging
The lowered motorway required progressive excavation, retaining wall construction, and base slab placement along a 3-kilometre corridor while maintaining access to intersecting streets and properties. Jerome developed a zone-based construction staging plan that divided the corridor into discrete construction cells, each with defined entry/exit points, crane pad locations, and concrete delivery routes. This cellular approach allowed multiple structural work fronts to proceed simultaneously while isolating each zone's construction traffic from live public roads and adjacent residential areas.
Technical Details
Key Structures
- Hawker Street overpass bridge - multi-span reinforced concrete
- Outer Harbour Rail Bridge - precast deck on piled abutments
- Lowered motorway retaining walls - 3km continuous alignment
- CST conduit system - full corridor cable support infrastructure
- Noise walls and architectural treatments
Service Relocations
- SAPN - high-voltage cable diversions and protection works
- Telstra - telecommunications conduit and pit relocations
- SA Water - trunk main protection and temporary supply works
- APA Gas - pipeline realignment and pressure testing
Alliance Partners
Need a Similar Capability on Your Next Project?
JCY delivers construction management for complex bridge and structural packages, including multi-utility service relocation coordination that keeps your programme on track.