Civil Engineering Reference
In-Depth Information
Table 16.1
Typical civil works maintenance schedule
Maintenance
Activity
Element
Component
Frequency
Structure
Internal
surface
Inspection for seepage, staining, spalling
Routine
Mapping of cracks—check for changes
General
Mapping of cracks—remapping
Principal
Testing for carbonation and chloride
ingress
Principal
Reapplication of silane
As required
Shear keys
Inspection for signs of distress at bearing
surfaces and corrosion of steel
components
Principal
Inspection for deterioration of bearings
(if used)
Principal
General
Corrosion cell monitoring
General
Performance of sacrificial anodes
General
Activate impressed current or
alternative CP system
As required
Settlement
Level survey through tunnel and
approaches
General
Immersion
joints
Omega seals
Inspection of seal and clamping system
condition if access is available.
Replacement is not an anticipated
maintenance activity
Principal
End frame
steel
Test performance of sacrificial anodes, if
installed
General
Void spaces
Check for water between Gina seal and
Omega seal and if present check if it is
saline or fresh
General
Check for water on inside of Omega
seal, remove as necessary, check for
presence of corrosive bacteria, and
introduce anticorrosive agents (if used)
General
Renew internal sacrificial anodes to joint
steelwork (if used and accessible)
As required
General
Check tunnel interior perimeter for
evidence of leakage
Routine
Monitor joint movement—opening,
rotation, differential settlement
General
Structure
seal
Inspect if visible on walls and roof, for
signs of deterioration or leakage
Routine
Ballast seal
Inspect during road surface renewal
As required
Road surface
seal
Inspection for deterioration and leakage
Routine
(
Continued
)
