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All those involved in bridge construction see a bridge as a structure that defies the test of time - it can withstand traffic loads, harsh weather conditions and the challenges of nature. The robustness and longevity of each individual component is critical to the bridge design, including the fastening and renovation solutions. In this context, robustness means relentless strength - it withstands seismic and fatigue loads, corrosive environments, and unexpected fire events - and ensures bridges remain robust for generations.
Bridges are naturally exposed to extreme environmental conditions such as high temperatures, temperature fluctuations, humidity, rain, de-icing salts, salt water and occasionally sulphur dioxide. This highly corrosive environment requires consideration of environmental factors and optimal material selection in accordance with applicable building regulations and standards. As bridge structures are to be considered as complete structures, the various stakeholders must consider not only the primary materials such as concrete and reinforcement steel, but also the secondary materials that work together to improve the durability of the structure. This holistic approach is essential to ensure that the entire structure can withstand environmental impacts. For example, fastening systems and concrete reinforcement solutions are chosen to resist the ingress of chlorides and water. To ensure effective corrosion protection, design engineers must also consider the environmental corrosion classification, the required service life of the bridge, the importance of the application, and local regulations. The requirements of the European Technical Assessment (ETA) for a minimum stainless steel grade according to corrosion protection class CRC 3 for outdoor applications are important - particularly relevant for most bridge projects. This underlines the importance of thorough evaluation of both primary and secondary materials to ensure long-term durability and structural integrity.
Even though concrete bridges have a high fire resistance, accidents can still occur, which underlines the need for fire-resistant construction of all components. The planners attach great importance to ensuring that the fastened elements meet the high fire protection standards. This includes (non-)load-bearing elements that are fastened with anchors, as well as concrete components that are reinforced with shear connectors, retrofitted reinforcement bars or innovative materials such as CFRP.
Bridges are subjected to traffic, wind and other dynamic forces, which can gradually weaken the structure. To ensure long-term durability, materials and components are carefully selected to withstand these stresses. In earthquake-prone areas, bridges must include solutions specifically approved for seismic stress to ensure they can withstand earthquakes without significant damage. Durability is a key aspect of the design process, paying special attention to fatigue strength and earthquake resistance to extend the life of the bridge.
The cost and time spent on building, maintaining or modernising bridges has a significant impact on profitability and sustainability. Delays disrupt the process, increase project costs and lead to congestion and further emissions.
By integrating innovative technologies and cost-effective solutions - such as advanced fastening and renovation methods - stakeholders can complete projects on time and on budget while ensuring safety, quality and sustainability.
Increasing productivity on bridge construction sites increases operational efficiency. Easy-to-use solutions optimise workflows and reduce the need for skilled workers, while construction robots that perform repetitive tasks compensate for labour shortages and ensure on-time completion.
Streamlined designs and reusable materials reduce waste and improve overall productivity, help meet schedules, reduce costs and support sustainable construction processes.
Planners, maintainers and bridge operators focus on cost-efficient infrastructure that minimises traffic disruptions and lowers operating costs over the entire life of the structure. Fewer shutdowns and longer maintenance intervals increase both efficiency and sustainability. Innovative monitoring solutions serve as preventive measures and enable a quick response to potential maintenance needs. If maintenance is required, it should be carried out with solutions that minimise traffic and operational disruption. fischer offers comprehensive fastening solutions for bridge construction that cover new construction, renovation and ongoing monitoring and ensure that the basic requirements of modern infrastructure are met.