Project Summary
Coffey delivered the demolition of a life-expired 2-span steel and reinforced concrete composite bridge over the M9 near Stirling, Scotland, and constructed a new 42-metre single-span composite bridge. The works also included road realignment, construction of retaining crib walls, and associated traffic management operations.
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Project Description
The existing 2-span bridge was replaced with a 42-metre single span composite structure, comprising in-situ concrete on steel I-beams with shear studs and an F3 fair-faced concrete finish. Parapets were cast integrally, with spray-applied waterproofing.
The bridge was founded on 24 bored piles, each 900mm in diameter and 18m deep. Two deck beams were installed during a full road closure. Works included 350 metres of road realignment and construction of precast concrete crib walls to support the higher alignment of Chartershall Road, which was raised by 0.5 metres.
Scope of Works
The works included:
- Demolition of the existing 2-span bridge within a 10-hour road closure using eight 30-tonne rock breakers.
- Construction of a new 42-metre single-span composite bridge with in-situ concrete deck and spray-applied waterproofing.
- Installation of 24 bored piles, 900mm in diameter and 18m deep.
- Realignment of 350 metres of Chartershall Road.
- Construction of precast concrete crib wall retaining structures.
- Full road closures planned, advertised and coordinated with Transport Scotland and emergency services.
- Temporary haulage road and removal of safety barriers to facilitate demolition and removal of material.
- Site compound established through agreement with local landowner.
Technical Highlights
- Complex bridge demolition completed safely within a 10-hour full road closure.
- New bridge constructed and opened to traffic 4 weeks ahead of programme.
- Realignment works and retaining structures successfully integrated with existing road network.
- Safe and efficient site operation maintained through strict exclusion zones, radio communications and emergency protocols.
Added Value
- Early road closure strategy brought forward by six weeks, enabling the programme to be accelerated.
- Delivery of the project ahead of schedule without complaints from road users or stakeholders.
- Proactive stakeholder and traffic management, ensuring clear communication with the public and authorities.
Environmental, Safety or Community Measures
- Advance signage and information campaigns reduced disruption to motorists.
- Strict traffic management and road safety measures implemented during closures.
- Careful planning of haulage routes to minimise community and environmental impact.
To learn more about Coffey’s work in active travel and urban infrastructure, or to discuss future opportunities, please contact us at 091 844356 or info@coffeygroup.com.
