Services:

Bridge Repair and Rehabilitation

 

Securing the Backbone of the Transport Network

Highway bridges and rail viaducts face a perfect storm of structural challenges. Decades of heavy dynamic traffic loading, severe freeze-thaw cycles and the aggressive use of de-icing salts relentlessly degrade concrete and masonry assets. When a bridge deck spalls or a support pier fractures, asset owners face a critical dilemma: execute a highly disruptive repair or risk catastrophic failure.

At Structural Repairs, we provide specialist engineering support to Highway Authorities, rail network operators and Tier 1 Contractors worldwide. We do not apply blind, cosmetic patches. We engineer targeted, low-carbon structural interventions designed to extend the life of the asset while keeping the transport network moving.

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London Bridge in Need of Repair

London Bridge in Need of Repair

The Diagnostic Foundation: Survey Before Surgery

You cannot engineer a permanent repair without first understanding the hidden pathology of the structure. On ageing bridge networks, the most severe threats – such as chloride-induced corrosion and post-tensioning voids – are entirely invisible from the surface.

Before any breakout or physical repair begins, our in-house engineering teams deploy advanced Non-Destructive Testing (NDT) and structural scanning.

  • Ground Penetrating Radar (GPR): We use high-frequency GPR scanning to look deep beneath the concrete cover, accurately mapping the internal reinforcement layout, locating post-tensioned cables and identifying subsurface delamination.
  • Corrosion Mapping: We deploy half-cell potential surveys to identify active “hotspots” of rusting rebar before the concrete begins to spall.
  • Cover Meter Surveys: We verify the exact depth of the concrete cover to ensure the structure complies with historical and modern design safety parameters.

This forensic data dictates the precise repair specification, ensuring you only pay for the exact engineering intervention your bridge requires.

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Engineered Repair and Reinstatement Solutions

Once the diagnostic data is analysed, our directly employed teams execute the physical remediation. Working in high-speed, live traffic environments requires agility and precision. We use rapid-setting technologies and advanced access platforms to complete critical repairs during tight possession windows or overnight closures, drastically reducing your Traffic Management (TM) costs.

  • 1. Concrete Reinstatement & Spall Repair We systematically break out delaminated and spalling concrete using vibration-free hydro-demolition. This high-pressure water technique removes diseased concrete without micro-cracking the remaining structure or damaging the exposed steel. The rebar is treated and the profile is seamlessly rebuilt using rapid-cure, BS EN 1504 compliant structural mortars.
  • 2. Cathodic Protection Systems Decades of winter gritting saturate bridge decks with chloride ions, creating an aggressive electrochemical environment that destroys steel reinforcement. To permanently arrest this decay without demolishing the bridge, we install Galvanic Sacrificial Anodes or Impressed Current Cathodic Protection (ICCP) systems. This scientifically halts the corrosion cycle, saving the existing concrete fabric.
  • 3. Carbon Fibre Strengthening When a bridge must be upgraded to accommodate heavier modern freight or requires repair following a vehicle impact, we deploy Carbon Fibre Reinforced Polymer (CFRP). By bonding ultra-thin, high-modulus carbon fibre plates to the tension zones of the bridge deck or wrapping the support piers, we vastly increase the live load capacity of the structure without adding heavy dead-weight or reducing bridge clearance heights.
  • 4. Bearing and Joint Remediation Failed expansion joints allow corrosive salt water to leak directly onto the substructure below – a primary cause of pier failure as noted by the Concrete Bridge Development Group (CBDG). We replace buried and mechanical joints and design temporary hydraulic jacking systems to safely replace seized bridge bearings, ensuring the deck can move dynamically as originally designed.

Bridge Projects

M5 Avonmouth crossing at sunset

GPR Surveys and Visual Inspections for National Highways: The M5 Avonmouth Bridge

A civil engineering case study detailing the deployment of autonomous robotic crawlers for Ground Penetrating Radar (GPR) and visual bearing inspections on the M5 Avonmouth Bridge. Highlights the acquisition of empirical data to inform preventative concrete repair and bearing replacement for National Highways, while eliminating rope access and traffic disruption.

Read MoreGPR Surveys and Visual Inspections for National Highways: The M5 Avonmouth Bridge

The Low-Carbon Life Extension

A full bridge replacement is an environmental disaster. Demolishing a structurally deficient viaduct to cast hundreds of tonnes of new concrete generates massive Scope 3 emissions and causes immense logistical disruption.

Structural Repairs champions a “repair first” sustainability philosophy. By repairing the failing matrix and strengthening the core structure, we safeguard the embodied carbon already invested in the bridge. Our engineered interventions align strictly with the sustainability frameworks set by the Institution of Structural Engineers (IStructE), extending the safe operational life of highway assets by decades for a fraction of the carbon cost of replacement.

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Bridge Repair FAQ

What causes concrete bridges to spall?

Spalling on concrete bridges is almost entirely driven by reinforcement corrosion. When de-icing salts (chlorides) or carbon dioxide (carbonation) penetrate the porous concrete, they attack the internal steel rebar. As the steel rusts, it expands with immense force. This phenomenon – known as rust jacking – blows the face off the concrete, creating falling debris hazards and compromising the load-bearing integrity of the deck or pier.

How do you repair a bridge deck without closing the road for weeks?

We use advanced material science and agile project phasing. Our engineers specify specialist fast-setting structural mortars and resins that achieve full load-bearing strength in as little as two hours. Combined with targeted hydro-demolition, this allows us to cut out, repair and reinstate a section of the bridge deck within a single overnight shift, reopening the lane before the morning rush hour.

How does carbon fibre strengthen an old bridge?

Carbon fibre (CFRP) has an exceptional strength-to-weight ratio. When bonded to the underside (tension face) of a bridge beam using structural epoxy, it acts as an external reinforcement tendon. It takes over the tensile load from corroded internal rebar, allowing an ageing bridge to safely support modern, heavier traffic loads without the need to bolt on heavy, rust-prone steel plates.

Bridge Repair and Rehabilitation

The Engineered Path to Remediation

Effective structural repair requires more than just a patch. We follow a rigorous 5-stage engineering workflow to ensure we treat the root cause, not just the visible symptom.

  1. Consult: Free initial assessment of your asset's symptoms.
  2. Scan: Non-destructive testing to map the invisible defect.
  3. Specify: Engineering the exact solution for the root cause, ensuring strict compliance with BS EN 1504 repair standards.
  4. Restore: Precision execution of the structural repair.
  5. Validate: Post-works re-scanning to prove structural integrity.

Secure your asset with absolute confidence.

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