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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 41 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

Major inspection of cables: The purpose is to undertake a check of the condition of cables, hangers with connections and anchoring to verify their functionality. Deter- mine any maintenance needs and make cost estimates for these activities. Major cable inspections shall be performed every fifth year.

Cables with uncertain damage development should be considered inspected more often than the general five-year interval. Intervals must be determined in each case adapted to the bridge in question and taking into consideration traffic volume, propor- tion of heavy traffic, bridge type and size, significance of the road network, low load carrying capability, state and development of damage leading to reduced capacity.

Major inspections of cables shall include a close visual check of cables, hangers with connections and anchoring. The inspection shall be supplemented by measurements and material investigations where necessary to assess the condition of these ele- ments.

Major under water inspection: The purpose of this inspection is to check the condition of any foundations under water and that of the bottom to ensure that they are func- tional. In addition, the inspection should determine the need for maintenance activi- ties and make cost estimates for these.

The general requirement is that major inspections under water shall be carried out every fifth year. Foundations exposed to erosion or undermining should be consid- ered for inspection more often than is generally required. The timing must be deter- mined in each case, adapted to the structure in question. In special cases extended intervals for major under water inspections may be accepted. This applies to founda- tions bedded in rock, or where there is no risk of erosion and scour. The precondition for this is that the Bridge Division considers it to be safe. An under water inspection of such foundations will be undertaken during the acceptance inspection, guarantee inspection and the initial major inspection. This does not apply to foundations where damage has been observed.

Major under water inspections shall include a close visual check of foundations and the bottom. The inspection shall be supplemented by measurements and material investigations to the extent required to assess the condition of the foundations.

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