Section 6: In-Depth Inspections
Reasons for In-Depth Inspections
In-Depth Inspections are supplementary and limited in nature. They are used to identify or monitor deficiencies not easily detected by routine means and methods. Specialized equipment might be required for access or material investigation. These inspections do not satisfy the NBIS requirements of routine, underwater, nor NSTM inspections. These are usually planned, recurring inspections addressing specific features but can be performed as a follow-up to other types of inspection. The frequency and level of inspection is determined on a case-by-case basis with input from the Bridge Inspection Program Manager, District Bridge Engineers, and others as required. The level of inspection will vary based on the type of potential deficiency but shall be sufficient in scope and detail to collect necessary information that an engineering evaluation can be made.
Examples of In-Depth Inspections are:
- Ultrasonic Testing performed on hanger assemblies of a multi-girder bridge every 5 years.
- Inspection of the grouting ducts in precast, post-tensioned segmental box beam bridge performed every 10 years.
- Closing of the roadway on a bridge to allow for a chain-drag inspection of the deck performed every other year, off the routine cycle.
A Qualified Team Leader must be present and participate in in-depth inspections. If the Qualified Team Leader is not an Engineer, the Engineer-of-Record must sign, date, and seal the report.
If issues are found to be severe enough to warrant a Critical Finding, notification and processes described in Section 14 of this Chapter still apply.
Include all documentation from In-Depth Inspections, identifying the location of bridge members inspected and documenting the inspection procedures, in the permanent bridge inspection file in AssetWise, TxDOT’s Bridge Inspection Management System.