Bridges

Exemplary components

Cup spring dampers	Post-tensioning systems	Concrete screws an anchoring
Cup spring dampers are always used where the aim is to transfer and dampen dynamic loads – for example in the stabilisation of suspension cables for arched bridges. A special corrosion protection is elementary to ensure longevity and functionality.	Post-tensioning systems are used, amongst other applications, in the transverse prestressing of bridges and pier heads and are used in both the construction of new bridges and the retrofitting of existing bridges. As they are exposed to unusual pressure and weathering conditions, protection against corrosion is especially important.	Fastening elements in bridge building have a safety-relevant factor: they secure restraint systems, noise protecting walls, retention and shear reinforcement and therefore generally need to achieve the highest corrosion resistance categories.

Requirements

Up to CX as per DIN EN ISO 12944
High corrosion protection (1,440 h as per DIN EN ISO 9227)
UV resistance
Economy with low maintenance outlay
Simple installation+ assembly

Solutions

Effective corrosion protection in bridge building is provided by the zinc flake coating developed by Dörken MKS. The technology approved by the Deutsches Institut für Bautechnik (DIBt) for the C5-M field can be applied in very thin coats of 8-12 µm at very low annealing temperatures (from 180°C). In addition, no hydrogen is generated in the application process - an advantage for high-tensile steel in particular. In combination with a suitable topcoat a high degree of cathodic protection and specific functional characteristics such as coefficients of friction or UV resistance can be achieved.

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From traffic signs and anchorings to noise protection walls and retaining systems for slopes (geotechnical engineering): steel safety-relevant equipment is used everywhere on roads and motorways. As these components require long-term protection against weathering, DIN EN ISO 12944-2 stipulates high-quality coating with the highest corrosion protection class.

Engineering

Metal components are used in a wide range of applications for stabilising, securing or reinforcing. Corrosion protection plays an important role wherever these metal constructions come into contact with moisture or are exposed to the weather.