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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 42 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

Special inspection: The purpose is to investigate closer any damage, movement and/or deterioration observed during previous inspections or from notes made. De- scribe any costly and/or complicated activities, which might be anticipated.

Special inspections may be considered in the following situations: previous major inspections have proven the need, accidents such as collision, overloading, flood or flooding, when experience with similar types of bridges and environment indicates so.

A special inspection is normally undertaken of particularly exposed or damaged ele- ments, but may also encompass the entire bridge. It may include a visual check, measurements or materials investigations or a combination of these.

During the inspection, a description of observed damages/deficiencies in various elements shall be prepared. An assessment shall be made on how the dam- age/deficiency could affect each element and the bridge as a whole and the impact of the damage. For a uniform description, standard types of damages are described in "Inspections Handbook for Bridges". The location of each damage/deficiency on the bridge and/or element should also be recorded.

The degree of damage is measured by a numerical scale used to give a technical assessment of the magnitude of the damage/deficiency; that is, whether mainte- nance activities must be executed or not, and if so, how soon. In the Table 21 the codes for the degree of damage are presented.

Rating 1 2 3 4

Description Slight damage/deficiency, no action required Medium damage/deficiency, action needed during next 4 - 10 years Serious damage/deficiency, action during the next 1-3 years

Critical damage/deficiency, immediate action required or within ½ year at the latest

9

Not inspected

Table 21. Damage condition rating in Norway.

The impact of the damage is represented by a letter code used to indicate the con- sequences any damage/deficiency might have on the bridge, bridge users and/or environment. The codes are presented in the Table 22.

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