Bridges

Concrete repair, cathodic protection and structural refurbishment for highway, rail and pedestrian bridges

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Sector Overview

Bridges are inspected, maintained and refurbished with more structure than almost any other asset type in the UK built environment. The reason is straightforward: bridges carry live loads across gaps, they cross routes that cannot easily be closed, and defects can have public safety and network consequences well beyond the structure itself. Highway authorities, National Highways, Network Rail, private rail infrastructure owners, local authorities and asset owners of pedestrian and utility bridges all operate to defined inspection regimes and structured intervention decision-making.

CRS delivers concrete repair, cathodic protection, structural strengthening, protective coatings, joint replacement and bearing renewal across the full range of UK bridge assets. Highway bridges from small overbridges through to major structures. Rail bridges including under-line and over-line structures. Pedestrian and footbridges on residential estates, campuses and public routes. Utility bridges carrying pipework, cabling or combined traffic. Historic and listed structures where sensitive intervention is required alongside technical repair.

The specific challenges bridge assets present are well established. Chloride-driven reinforcement corrosion is the dominant deterioration mechanism, driven by de-icing salt on highway bridges, salt spray on coastal structures, and industrial atmospheres on urban bridges. Joint and bearing failure allows water tracking through the structure, accelerating damage. Access for both inspection and works is often the biggest single cost variable, requiring the right combination of possessions, traffic management, rope access, MEWP under-bridge units, and coordination with the infrastructure owner. Delivery has to work within possession windows that are often short, unusually timed, and heavily costed.

CRS works directly for bridge asset owners on structured procurement routes, and as a specialist sub-contractor to main contractors delivering bridge framework schemes. The combination of specialist concrete repair capability, rope access under-bridge inspection capability and cathodic protection specialism is particularly relevant to bridge asset owners who need one contractor for both inspection and delivery on the same structure.

Common Challenges in this Sector

Chloride-Driven Deterioration

De-icing salt on highway bridges, salt spray on coastal structures and industrial atmospheres all drive chloride penetration to the reinforcement. Bridges are among the most chloride-exposed reinforced concrete assets in the UK and require both repair and protection to manage the underlying corrosion mechanism.

Access for Inspection & Works

Bridge soffits, bearings, joints and abutment faces are frequently difficult to access. Traffic management, possessions, MEWP under-bridge units, rope access and scaffold each have their place; the right combination for each structure is a technical and commercial decision agreed at scoping.

Joint & Bearing Failure

Failed expansion joints and degraded bearings allow water and chlorides to track into the structure, spreading damage from the joint zone outwards. Joint replacement is technically routine but often delayed by the possession and cost implications, with wider structural damage as the consequence.

Possession Windows & Traffic Management

Bridge works are almost always delivered under possession or traffic management. Rail possessions are typically overnight or weekend, tightly costed and controlled. Highway possessions vary from single lane closures to full carriageway closure. Delivery methodology has to fit the possession, not extend it.

Inspection Reporting & Bridge Management Systems

Highway authorities and infrastructure owners operate bridge management systems with defined reporting formats, severity classifications and intervention decision-making. Inspection deliverables need to integrate with the client’s established system rather than requiring translation.

Cathodic Protection Decisions

On bridges with established chloride contamination, cathodic protection is often the most cost-effective long-term intervention. The specification decision requires proper corrosion assessment, structural context and coordination with the wider bridge management strategy.

How CRS Delivers for Bridges

Whole life from inspection through repair

CRS inspects, tests, specifies, repairs and protects. The team that inspects the bridge can return for follow-on works and future inspection cycles, giving the asset owner continuity across the service life of the structure.

Access method flexibility including rope access

IRATA Level 3 rope access is available for under-bridge inspection and localised works where MEWP under-bridge access is difficult or where possession windows do not support platform installation. On larger works where scaffold or MEWP is the right answer, we specify and manage the access accordingly.

Cathodic and corrosion protection specialism

CRS delivers impressed current and galvanic cathodic protection systems on bridge structures from initial corrosion assessment through specification, installation and ongoing monitoring. The specification decision is informed by testing and structural context rather than applied by default.

Traffic management and possession-aware delivery

Works methodology, plant selection and phasing are planned to complete within the agreed possession window. Repeat possessions for the same works are avoided through proper scoping and coordination with the traffic management or possession contractor.

Relevant Services

Our services most commonly used on projects in this sector

Recent Projects in this Sector

Related Sectors

Frequently asked questions

Yes. CRS delivers concrete repair, joint replacement and structural refurbishment on rail bridges under Network Rail and private rail infrastructure ownership, as well as highway bridges. Rail work requires appropriate certification, possession coordination and delivery within tightly controlled possession windows. Works methodology is planned to complete within the possession rather than requiring extension.

Often, yes. Rope access under-bridge inspection avoids the cost and traffic disruption of MEWP under-bridge units, and can be deployed where the geometry or the possession window does not support platform access. For structural condition assessment where the inspector needs to sound the soffit, measure defects and take samples, rope access delivers close-quarters inspection that drone alone cannot provide. For larger works following the inspection, the appropriate access method (platform, scaffold, ropes) is agreed at specification.

On bridges with established chloride contamination or where testing shows active reinforcement corrosion, cathodic protection is often the most cost-effective long-term intervention because it stops the underlying corrosion mechanism rather than only addressing visible spalling. The specific decision depends on the extent of contamination, the structural context, the remaining design life and the client’s asset management strategy. A corrosion assessment survey establishes whether cathodic protection is warranted before any specification is written.

Inspection deliverables are produced in the format your bridge management system requires. For highway authorities, this typically follows the client’s established BMS structure. For rail assets, the infrastructure owner’s inspection reporting standard applies. Format is agreed at scoping and the deliverable is built to integrate with your existing system rather than requiring translation.

Yes. CRS can be appointed as Principal Contractor on bridge inspection and repair works where required, with full CDM 2015 compliance. On framework schemes and larger programmes delivered under a main contractor Principal Contractor, we work as their specialist sub-contractor and provide the technical and safety documentation their role requires.

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