Inspection implementation

The primary object of maintenance work is to maintain the expressways in good condition.
All structures on the Hanshin Expressway are regularly checked and inspected to evaluate actual conditions.

Routine inspection

In order to prevent third-party disasters, on-road inspection patrols are conducted basically 3 times a week in order to detect damages on road surfaces, while off-road inspection patrols are conducted basically 6 times a year in order to observe road structure from distance.

On-road inspection patrol
On-road inspection patrol
Off-road inspection patrol
Off-road inspection patrol

Periodical inspection

Comprehensive structural inspections by detailed observation of bridges are conducted basically every 5 years.

Comprehensive inspection by approaching to bridge
Comprehensive inspection by approaching to bridge

Evaluation of Structural Deterioration

Typical cases of structural deterioration are shown in the figures below.

Evaluation of Structural Deterioration

Damages detected through the inspections are classified into the following categories in terms of damage severity.

Category Definition
S Severely damaged; should be repaired as soon as possible
A Damaged; should be repaired
B Condition of the damage is needed to be observed
C Slightly damaged
OK Other than the above

(INSPECTION STANDARD FOR HIGHWAY STRUCTURES, Hanshin Expressway 2011)