Overview
Construct a 940-metre pre-stressed concrete bridge to link Ibadan's western bypass with the Challenge-Toll Gate corridor, eliminating the need for vehicles to pass through the city centre.
Project Facts
- Location
- Challenge–Toll Gate, Ibadan
- Client
- Oyo State Ministry of Works
- Project Type
- Infrastructure
- Status
- Completed
- Duration
- 11 Months
- Completion Date
- September 2019
- Services
- Civil Engineering · Pre-stressed Concrete · Incremental Launching · Caisson Foundations · Road Surfacing
- Structural Engineer
- NOTGATE Civil & Structural
- Team Size
- 140 workers at peak
The Challenge
The bridge had to span a major river and existing road intersection with minimal disruption. Pre-stressed concrete requires precise tensioning and curing — any error compromises the entire structure. The state also required that the existing road remain open throughout construction.
The Solution
NOTGATE used incremental launching for the bridge deck, pushing segments across from one abutment while maintaining traffic below. Pre-stressing cables were tensioned using computer-controlled jacks to ensure uniform force distribution. The river piers were founded on caissons sunk through 12 metres of alluvium to bedrock.
Project Gallery
Project Impact
The bridge reduced inner-city transit time by 35% and has handled over 50 million vehicle crossings with zero structural issues. It won the Nigerian Society of Engineers' 'Infrastructure Project of the Year 2019'. 35% transit time reduction.
940m
Span
50M+
Vehicle Crossings
35%
Transit Reduction
NSE 2019
Award
"NOTGATE built us a bridge that has transformed Ibadan's traffic flow. Their incremental launching technique kept the road open and the quality is outstanding."
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