토목 인프라 점검 19개 항목
Underwater & Scour Bridge Inspection
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Underwater (dive) inspection of submerged substructure and channel documenting scour, undermining, and foundation condition below the waterline.
NBIS 23 CFR 650 Subpart CFHWA HEC-18 Evaluating Scour at BridgesAASHTO Manual for Bridge Evaluation
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Dive Setup & Qualifications
- Is the underwater inspection within the assigned interval (max 60 months or risk-based)? *
- Is the dive team qualified for the assigned bridge inspection dive level (I/II/III)? *
- Was a dive safety plan and surface communication in place before entry? *
- Date of inspection *
- Water depth and estimated visibility at time of dive
Channel & Streambed
- Channel and channel protection condition rating (0-9) *
- Is the streambed profile consistent with prior soundings without new scour holes? *
- Is channel protection (riprap, articulated block, gabions) in place and stable?
- Is debris accumulation or channel migration threatening the structure?
Submerged Substructure
- Are submerged pier and abutment surfaces free of undermining or exposed footings? *
- Is concrete free of significant deterioration, spalling, or exposed reinforcement below the waterline? *
- Are timber/steel piles free of marine borer damage, corrosion, or section loss at the mudline?
- Measured scour depth at deepest point relative to footing (feet)
Scour Evaluation & Plan of Action
- Scour critical bridges rating (Item 113) confirmed consistent with field findings? *
- Is a Plan of Action (POA) on file and current for scour-critical structures? *
- Do observed conditions warrant a POA update or interim countermeasure?
Findings & Documentation
- Are any critical findings requiring immediate notification present? *
- Underwater photograph/video of representative conditions captured?
- Dive team leader signature *
Underwater & Scour Bridge Inspection 체크리스트 전체 다운로드
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