SAMCO Final Report 2006 F09 Report on Bridge Management
Major inspection: The purpose of the major inspection is ensuring that the condition of the entire bridge is functional; determining any need for maintenance activities, and making cost estimates of these activities. A major inspection is generally re- quired every fifth year for bridges. For ferry quay constructions and moveable bridges, this is reduced to every third year. The first major inspection shall be per- formed at the required interval after the end of the claims deadline.
If a bridge has suffered damage whose potential for development remains unknown, then increased inspection frequency should be considered. These intervals must be determined for each case and adapted for the bridge in question. Some significant conditions to consider include: traffic volume, proportion of heavy traffic, bridge type and size, significance of the road network, low load carrying capability, condition and damage development that might lead to too low capacity, bridges exposed to flooding or erosion. Bridges older than 50 years should have major inspection at least every fifth year. Checking machinery etc. on movable bridges should normally be made simultaneously with routine servicing. Intervals for these are determined individually in each case.
In special occasions it is possible to increase the intervals depending on total bridge length and bridge type. It is granted that the person responsible for the bridge man- agement, consider this when a major inspection is carried out. Maximum interval be- tween each general inspection is then:
10 years for bridges with span less than 10 m without streaming water under- neath,
5 years for bridges with span less than 10 m with streaming water underneath and for bridges with span equal or greater than 10 m,
3 years for movable bridges.
Major inspection will include a close visual check of the entire bridge structure. Major inspections can be supplemented with measurements and material investigations as necessary to assess the bridge's condition.
Additional actions are taken for the inspection of cables and under water inspections, which are described in the following.
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