High-Mast Tower-Base Inspection Ohio Departm ent of Transportation - PowerPoint PPT Presentation

Ohio Department of Transportation John R. Kasich, Governor Jerry Wray, Director High-Mast Tower-Base Inspection Ohio Departm ent of Transportation Mike Brokaw, P.E. Office of Structural Engineering Decem ber 9 & 10 , 20 14 1

High-Mast Tower-Base Inspection 1. BACKGROUND 2.RESPONSE 3.METHODS a)SCOPE b)SCHEDULE c) INSPECTION i. VISUAL ii. PHYSICAL iii.NON-DESTRUCTIVE iv. RECORDKEEPING 2

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11 ‘Shiny’ Edge Edge VS. Corroded

Fatigue Life Num ber of load cycles required to initiate a crack. Its life is m ade up of three stages: 1. Crack Initiation 2.Crack Propagation 3.Fracture 12

Value Structures, Inc. Minim um 18 sides “fluted” 6 bolts (1-3/ 8 -in. DIA. Holes Overall Height = 98 -ft – 112-ft Dia. Base Plate = 30 -in Thickness of base plate = 1-3/ 8 -in. Dia. Pole at base= varies 18 -24-in Thickness of pole at base = 1/ 8 -in. 13

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RESPONSE IMMEDIATE INSPECTION AT INTERCHANGE DEVELOP APP TRAINING INSPECT ALL HIGH MAST TOWERS FOR CRACKING AT THE BASE 15

Training Time Location District Tuesday 12/9 9:30 – 11:30 AM GA D5, D6, D9 Tuesday 12/9 12:30 – 2:30 PM GA D2, D7, D12 Tuesday 12/9 9:30 – 11:30 AM GB D3, D1, D8 Tuesday 12/9 12:30 – 2:30 PM GB D4, D10, D11 Wednesday 9:30 – 11:30 AM GA Backup Day As Needed For 12/10 Changes Wednesday 12:30 – 2:30 PM GA Backup Day As Needed For 12/10 Changes 16

METHODS (SCOPE) District personal should visit each light tower location and perform a visual inspection of the structure, with particular attention to the area around the base weld. 17

METHODS (Inspection App) Name of Inspector Who Can Will Need Access to the District Inventory App Provide Inspector Email 4G Cell (xxx.xxx@dot.state.oh.us) Phone & First Name Last Name Charger (y/n) 18

METHODS (Inspection App) Name of District Personnel to be Automatically Emailed if an Inspection Report Finds an Issue (These are the people who would be involved in a followup examination of the tower in question) First Name Last Name Email (xxx.xxx@dot.state.oh.us) 19

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METHODS (INSPECTION) 1. Visual Bifocals Use them if you require them to drive Within Arms Length Visual inspection; preferably within 18-inches 22

METHODS (INSPECTION) 2. Audible Sound each bolt with hammer Heavy 1-3 lb. blacksmith or ball-peen hammer for “sounding test” of base/ anchor bolts 23

METHODS (INSPECTION) 3. Record Keeping - Use the ‘App’ Separate 1-hour Training Today Good Practices when taking photos: Take Photos – • Take overall and close up Minimum of 3 • Focus 0-180 degrees • Try to have the sun behind you • Look at the image on the screen 180-360 degrees • Document the location of the Pole ID-Marker photographs and even direction 24

The Minim um Three Photos - Use the ‘App’ Pole ID Marker: 0-180 Degrees 180-360 Degrees CONTROL CENTER 4, CIRCUIT G, TOWER # 2 25

Recordkeeping - Use the ‘App’ SITE CONDITIONS: ACCESS TO TOWER (GOOD,POOR,NONE): _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ IS THERE A MOVING TRAFFIC HAZARD DURING ACCESS? (Y/ N) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 26

Recordkeeping - Use the ‘App’ TOWER CONDITION VISIBLE CRACKS NEAR BASE? (Y/ N) _ _ _ _ _ _ IF PRESENT, TAKE AT LEAST ONE PHOTO OF EACH CRACK AND RECORD THE # AND LENGTH OF CRACKS HERE: (# / LENGTH IN INCHES) 1. _ _ _ _ 2. _ _ _ _ 3. _ _ _ _ 4. _ _ _ _ 5. _ _ _ _ 6. _ _ _ _ 7. _ _ _ _ 8 . _ _ _ _ 9. _ _ _ _ 10 . _ _ _ _ 11. _ _ _ _ 12. _ _ _ _ 13. _ _ _ _ 14. _ _ _ _ 15. _ _ _ _ 16. _ _ _ _ IS THE MAIN TUBE MULTI-SIDED? (Y/ N) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ # OF SIDES? (8 -30 ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ WHAT IS THE SHAPE OF THE BASE PLATE? (SQUARE, OCTAGON, RECTANGLE, ROUND) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ # OF ANCHOR BOLTS (4-16) _ _ _ _ _ _ _ ARE ANY ANCHOR BOLTS VISIBLY CRACKED (Y/ N) _ _ _ _ _ _ _ _ _ _ _ _ _ _ DO ANCHOR/ LEVELING NUTS APPEAR TIGHT? (Y/ N) _ _ _ _ _ _ _ ALL LOCK WASHERS IN PLACE? (Y/ N) _ _ _ _ _ DO ALL LOCK WASHERS (IF PRESENT) APPEAR TO BE FULLY COMPRESSED? (Y/ N/ NOT APPLICABLE) _ _ _ _ _ 27

Recordkeeping - Use the ‘App’ TOWER CONDITION [HAMMER TEST] STRIKE A STRONG BLOW TO THE TOP OF THE ANCHOR BOLTS WITH THE HAMMER TO CHECK FOR LOOSE NUTS AND/ OR BROKEN ANCHOR BOLTS: 1. DO ANY ANCHOR NUTS LOOSEN WHEN THE TOP OF THE BOLT IS STRUCK WITH THE HAMMER? (Y/ N) _ _ _ _ _ _ _ _ _ _ (HINT: WATCH FOR NUT TO ROTATE A SMALL AMOUNT) 2. DO THE ANCHOR BOLTS HAVE A SOLID-SOUNDING “RING” WHEN STRUCK? (Y/ N) _ _ _ _ _ _ _ _ _ _ _ _ (HINT: BROKEN ANCHOR BOLTS WILL OFTEN HAVE A DULL, “THUD” SOUND) 28

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Recordkeeping - Use the ‘App’ FOUNDATION IS THERE AT LEAST ONE THREAD STICKING OUT ABOVE ALL THE ANCHOR NUTS? (Y/ N) _ _ _ _ _ _ _ _ _ _ _ _ _ _ IS THERE A LARGE AMOUNT OF RUST STAINING OF THE CONCRETE AROUND THE ANCHOR BOLTS? (Y/ N) _ _ _ _ _ _ _ _ _ _ (A SMALL AMOUNT IS NORMAL). IF YES, PROVIDE PHOTOS. IS THERE A LARGE AMOUNT OF RUST STAINING OF THE CONCRETE UNDERNEATH THE TUBE? (Y/ N) _ _ _ _ _ _ _ _ _ _ (A SMALL AMOUNT IS NORMAL). IF YES, PROVIDE PHOTOS. 30

Note: The App will Prioritize and Send Emails NO CRACKING GOOD No Follow Up Warranted CRACKING CRACKING 1 or 2 cracks 1 or 2 cracks POOR Use judgment! For example only 1 crack exists but it is 10- Use judgment! For example only 1 crack exists but it is 10- inches long. inches long. CRACKING 3 or more cracks SEVERE Follow Up Warranted, automatic emails, District and OSE. Response includes removing luminaire rings immediately and the pole should be removed as soon as possible. 31

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33 SEVERE

34 SEVERE

35 SEVERE

36 SEVER E

37 SEVERE

38 SEVERE

39 GOOD

40 GOOD

41 ENOUGH CLOSE NOT

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44 Questions