The primary object of maintenance work is to maintain the expressways in good condition.
All structures on Hanshin Expressway are regularly checked and inspected to evaluate actual conditions.
To prevent third-party disasters, on-road inspection patrols are conducted basically three times a week in order to detect damage on road surfaces, while off-road inspection patrols are conducted basically six times a year in order to observe road structure from a distance.
- On-road inspection patrol
- Off-road inspection patrol
Comprehensive structural inspections by detailed observation of bridges are conducted basically every five years.
- Comprehensive inspection of bridge
Evaluation of Structural Deterioration
Typical cases of structural deterioration are shown below.
Damages detected through the inspections are classified into the following categories according to damage severity.
|S||Severely damaged; should be repaired as soon as possible|
|A||Damaged; should be repaired|
|B||Condition of the damage needs to observed|
|OK||Other than the above|
(INSPECTION STANDARD FOR HIGHWAY STRUCTURES, Hanshin Expressway 2011)