Trail Bridge Inspection and Condition Assessment Module 3 ...

Trail Bridge Inspection and Condition Assessment Module 3 ...

TRAIL BRIDGE INSPECTION BRIDGE INSPECTION PROCEDURES Objectives: Learn the different inspection methods Learn a standard procedure to conduct routine bridge inspection

Learn what to look for during an inspection Bridges Inspection Methods There are three basic methods used to inspect a timber bridge. They include: Visual

Physical Advanced inspection techniques Visual Inspections For timber members, visual inspections reveal areas that need further investigation such as checks, splits, shakes, fungus

decay, deflection, or loose fasteners. Types of Visual Inspections Cursory Inspection Involves reviewing the previous inspection report and visually examining the members Involves a visual assessment to identify

obvious defects Hands-on Inspection. Requires the inspector to visually assess all defective timber surfaces at a distance no further than an arms length Timber surfaces are given close visual

attention to quantify and qualify any defects. Physical Examination Once the defects are identified visually Physical procedures are then used to find out the extent of the deterioration or decay The basic methods for physical

examination are: Pick Test Sounding Pick Test Probing with a pointed tool such as an awl will locate decay near the wood surface.

Decay will be evidenced by excessive softness or lack of resistance to the probe penetration and the breakage pattern of the splinters. A brash break indicates decayed wood, whereas a crisp splintered break with the splinter hinging from one end indicates sound wood.

Pick Test Decayed wood breaks abruptly across grain without

Sound wood pries out as long splinters. Sounding Sounding the surface by striking it with a hammer is one of the oldest and most commonly used

inspection methods. Although sounding is widely used, interpretation is VERY subjective. Soundings are based on the tonal quality of the ensuing sounds and the rebound of the hammer Practical experience has shown that sounding is only useful for members less than 4 inches thick.

Sounding Interpreting Soundings: Sound timber gives a crisp sound. Defective timber gives a dull sound. Loose hardware will vibrate. Note: A 2 inch thick shell

of competent wood is sufficient to mask any interior rot. Advanced Inspection Techniques Other types of advanced inspection

techniques are: Coring and Drilling Resistograph Drill Stress Wave Meter Moisture Meter These techniques are beyond the scope of

this training course. General Bridge Inspection Procedures The bridge inspection procedure should be completed by the numbers. Which means the bridge is inspected in a

methodical way from either top to bottom or bottom to top. It is important to document the inspection. General Bridge Inspection Procedures Documentation should include:

An inspection report and notes And lots of photographs Photographs should be a minimum of 10 pictures with additional pictures of problem areas.

General Bridge Inspection Procedures Minimum required photographs: 1) Near approach looking at the bridge 2) Far approach looking at the bridge 3) Bridge deck and railing 4) Underside of the deck and beams

5) Upstream looking downstream at the bridge 6) Downstream looking upstream at the bridge 7) Looking upstream from the bridge 8) Looking downstream from the bridge 9) Near side substructure 10) Far side substructure

Near and far approaches looking at the bridge Bridge Deck and Railing Underside of Deck and Beams

Looking upstream and downstream from the bridge deck Looking upstream and downstream at the bridge

Looking at right and left abutments Additional Photos Anything that needs to be noted or watched.

Starting an Inspection First conduct a cursory visual inspection of the entire bridge looking for indications of problems. Cursory Visual Inspection Look for:

Sagging or twisted beams Hanging or broken beams

Pounding water Settlement Next, conduct a hands-on visual inspection of the bridge parts taking into account any indications of problem found during the cursory inspection.

During the hands-on visual inspection, the inspector should look for signs of deterioration or decay that will require a physical examination. Where to look for decay?

Where to look for decay?

Around Checks Around Splits Around Shakes Around Cracks Around Fasteners

Areas in contact with soil Areas where debris and water collect Conduct the inspection BY THE NUMBERS Start at the top of the bridge and work your way down the load paths. This will help

you from missing any parts of the structure. One Inspection order could be: 1. Railings/curbs 2. Decking (Planks) 3. Superstructure (Beams, Stringers)

4. Substructure (Abutments, Sills) 5. Channel 6. Approaches 7. Signage General Bridge Inspection Procedures

1) Inspection of railings/curbing Things to looking for? Missing rails, posts, curbs or hardware Broken rails, posts or curbs Deteriorated (rotten) rails, posts or curbs 1) Inspection of railings/curbing

Missing rails, posts, curbs or hardware 1) Inspection of railings/curbing Broken rails, posts or curbs 1) Inspection of railings/curbing

Deteriorated (rotten) rails, posts or curbs General Bridge Inspection Procedures 2) Inspection of decking Things to looking for? Missing planks or hardware

Broken planks or hardware Deteriorated (rotten) planks Wear of the deck Debris on deck 2) Inspection of decking Missing planks or hardware

2) Inspection of decking Broken planks or hardware 2) Inspection of decking Deteriorated (rotten) planks

2) Inspection of decking Wear of the deck 2) Inspection of decking Debris on deck

General Bridge Inspection Procedures 3) Inspection of superstructure Things to looking for? Sagging beams Broken or cracked beams Missing hardware

Deteriorated (rotten) beams Impact damage of beams from floating debris or ice 3) Inspection of superstructure Sagging beams

3) Inspection of superstructure Broken or cracked beams 3) Inspection of superstructure Deteriorated (rotten) beams 3) Inspection of superstructure

Impact damage of beams from floating debris or ice General Bridge Inspection Procedures 4) Inspection of substructure Things to looking for?

Settlement of the substructure Missing substructure or hardware Deteriorated (rotten) substructure Damage of substructure from floating debris or ice Scour damage

4) Inspection of substructure Settlement of the substructure 4) Inspection of substructure Deteriorated (rotten) substructure 4) Inspection of substructure

Scour damage 4) Inspection of substructure Other things to look for: Missing substructure or hardware Damage of substructure from floating debris or ice

General Bridge Inspection Procedures 5) Inspection of the Channel Things to looking for? Degrading of the stream (down cutting) Aggrading of the stream (deposits)

Scour of the banks Loss of bank protection Floating debris or Ice damage General Bridge Inspection Procedures 6) Inspection of approaches

Things to looking for? Approach material washed away Slumping of the approaches at the backwall Unraveling at the edges of trail Potholes General Bridge Inspection

Procedures 7) Inspection of signs Things to looking for? Broken or damaged signs and posts Dont forget to count the bullet holes Missing fastners Missing signs/object markers for ATV and

Snowmobile bridges References FHWA Bridge Inspection Reference Manual FHWA Field Manual for Timber Bridge Inspection, Draft FPL Controlling Decay in Water Front Structures FPL Timber Bridges Design, Construction, Inspection

and Maintenance FPL Wood Handbook FPS Wood and Timber Condition Assessment Manual R6 Trail Bridge Inspection R10 Training PowerPoints End

Bridge Inspection Procedures

Recently Viewed Presentations

  • SYSTEM SAFETY SOCIETY Organized 1962 Incorporated 1973 Professionals

    SYSTEM SAFETY SOCIETY Organized 1962 Incorporated 1973 Professionals

    Added database report of Safety related courses and focus groups to the society website Developed draft system safety common practice for review by EC Developed a "roadmap" for professional development as an initial step toward the promotion of increased safety...
  • EDUCATION INNOVATION AND RESEARCH (EIR) EARLY-PHASE SELECTION CRITERIA

    EDUCATION INNOVATION AND RESEARCH (EIR) EARLY-PHASE SELECTION CRITERIA

    As you can surely see by now, the independent evaluation is a critical part of a successful EIR project, so you need to find an evaluator that is experienced and ably qualified to conduct an evaluation that will meet What...
  • The Big Picture Houston Conference on Children June

    The Big Picture Houston Conference on Children June

    050910 Copperas Cove ISD. 051901 Paducah ISD. 052901 Crane ISD. 053001 Crockett Co Cons CSD. 054901 Crosbyton ISD. 054902 Lorenzo ISD. ... 108907 Mercedes ISD. 108908 Mission Cons ISD. 108909 Pharr-San Juan-Alamo ISD. 108910 Progreso ISD. 108911 Sharyland ISD. 108912...
  • Introduction to MLA Citations F OR Y O

    Introduction to MLA Citations F OR Y O

    For your Poetry Anthology Project, you will be required to select three published poems and cite those poems in MLA format. Fun Fact: MLA = Modern Language Association. Introduction toMLA Citations. The Basics. ... when citing sources! Learn to use...
  • HOXA9 Regulates Enhancers of Genes involved in Hematopoiesis

    HOXA9 Regulates Enhancers of Genes involved in Hematopoiesis

    The transduced human stem cells were examined after 3 weeks and there was a significant increase in immature blood cells and reduction in mature cells in the NUP98-HOXA9 cells in comparison to the control cells. After five weeks of being...
  • Is Our Food Safe From Attack? - University of Missouri

    Is Our Food Safe From Attack? - University of Missouri

    Food Defense. In a Beef Production Setting. Courtesy of Food Technology magazine, from "Defending the Food Supply," August 2005, Vol. 59, No.8. Food Technology is a publication of the Institute of Food Technologists, www.ift.org.
  • Data Visualization - Cityarts

    Data Visualization - Cityarts

    Data Visualization A Sketch QUESTIONS: Martin Wattenberg What would be a typical research process for your projects? Where do you start and why, in regards to the following statement, "Wattenberg is a researcher at IBM, where he invents new forms...
  • Nyskaping ved universitetene

    Nyskaping ved universitetene

    Hofstede's Four (five) Dimensions of Culture. Power distance. The extent that a culture excepts that power is unequally distributed. Generally low in Scandinavia. High in south America and France. Uncertainty avoidance. Degree to which members of a culture is uncomfortable...