CIVE1173 Bridge Inspections

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Author:
higgsboson
ID:
224428
Filename:
CIVE1173 Bridge Inspections
Updated:
2013-06-20 08:14:13
Tags:
Levels Bridge Inspect
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Description:
Week 11 lecture notes summary. Exam
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  1. Bridge Inspections Level 1
    • Routine inspection; visual only, qualitative, annually, bridge owner responsible, also after major incident
    • Purpose; identify defects, assess safety, check routine maintenance and repair, initiate further investigations
  2. Bridge Inspections Level 1 - Scope
    • Current condition
    • Repairs; quality, performance
    • Maintenance requirements; routine, one off
    • Bridges; Road Surface, Rails/barriers, Drainage, Footpaths/waterways, Joints, Bearings, Superstructure and Substructure
    • Pre-cast Box Units; Road Surface, Rails/barriers, Drainage, Waterways, Walls and aprons, Culvert units
  3. Bridge Inspections Level 1 - Exclusions
    • (inaccessible areas covered in Level 2)
    • Inside of box type superstructure; Box girders Area behind Abutments
    • Piles and Foundations; Below ground, Under water
  4. Bridge Inspections Level 2 - Routine inspection
    • Extensive visual
    • Detailed inventory (above ground)
    • Assign condition rating; individual components, overall condition
    • Frequency; dependant on type & condition (2 years for timber, 4 years for others).  More frequent for critical bridges or poor condition
  5. Bridge Inspections Level 2 - Purpose
    • Defective components; (Extent, Severity, Criticality), Recommendations, Ensure satisfaction of requirements, Records,
    • Confirmation of repair, Identify inventory changes, Maintenance needs, Establish history, Feedback, Determine or revise load rating,  Bridge Management System
    • SLK (Straight Line Kilometres) to define points on road
  6. Bridge Inspections Level 2 - Outputs
    • Detailed condition assessment report
    • Identification of:
    • - components for special inspection
    • - components for closer monitoring
    • - work items
    • - supplementary testing
    • - photographic record
  7. Bridge Inspections Level 2 - Scope
    • All timber, steel,masonry and concrete bridges
    • All components above ground and water level
    • Individual components at close range
    • All bearings
    • Thickness gauge measurements
    • Structural welds and anything raised previously
    • Detailed and multiple photos (location, severity, size & extent)
    • Show scaling (tape measure or ruler)
  8. Bridge Inspections Level 2 - Exclusions
    • Area behind Abutments
    • Components; More than 500 mm below ground, Under water
  9. Bridge Inspection Preparation
    • Background info (e.g previous reports & inspections)
    • Access requirements; ladder, crane, boat, TMP if needed
  10. Bridge Inspection Site Visit
    • Personnel
    • PPE
    • Level 2 Inspection; purpose, numbering of components, standard info, report
    • General bridge info
  11. General Bridge Information
    • Bridge no.
    • Structure type; e.g. reo concrete, prestressed concrete, timber hybrid
    • Superstructure; type
    • Responsibility Area, Road Name, Road Number, Crossing Name, Owner, Local Govt. (Authority) SLK distance, Latitude, Longitude
    • Total width, Length, Number of spans, Skew, Max. & Min. Headroom, Width btwn kerbs, Location, North, Flow direction
  12. Bridge Group Types
    • Bridge and Deck (only 1)
    • Approach (2 Approaches); Label 1 and 2, Abutment, Pier, Span (multiple); Label 1, 2, 3…
  13. Bridge Component Types
    • Wall pile
    • Status
    • SI Units (type)
    • Not inspected (%)
    • Photographic record
    • Sketch
    • Work; required, type, description, priority
  14. Bridge Inspection - Site Condition
    • Drive Through
    • Traffic Control
    • Parking Position
    • Access to Abutments
    • Access to Piers
    • Pier Headroom
    • Potential Hazards
  15. Defects - cracks
    • Record location & width
    • Sketch
    • Photgraph
  16. Drainage
    • Flooding hazard:
    • Traffic
    • Across joints, deck, bearings (corrosion, erosion
    • , staining)
  17. Waterways
    • Flooding; blockage of bridge
    • Scour; stream bed, slopes, embankments, undermining of abutments
  18. Bridge elements and structural items 1 of 2
    • Pre-cast box units
    • Superstructure; spalling, exposed reo, rusting, leaching, efflorescence, deflections, watertightness, instability
    • Deck joints; bolts, cracking, seals, levels, plates
    • Beams & Tie Beams; shear, tension, spalling, cracking, deflection, load point crushing
    • Box Girders; leakage, drainage holes, corrosion, cracking, welds, spalling
  19. Bridge elements and structural items 2 of 2
    • Prestressing; Longitudinal & Transverse cracking, end-blocks, loose rendering
    • Substructure; piles, movement in abutments, instability, water wash
    • Bearings; mechanical or fire damage, debris build-up, seating & alignment
    • Steel components; protective coating, fracture, cracking, loose, wear
    • Coatings; adhesion loss, inadequate surface prep, poor thickness
    • Masonry; cracking, splitting, mortar loss
  20. Photographic record
    p60 & 62 of Week 11
  21. Condition index
    • Each component assigned a condition state
    • Average taken for all elements
    • All components on bridge then combined
    • Multipliers applied to groups
    • Weighted averages
    • Convert to BCI using scaling equations
  22. BCI range

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