J. David Rogers Natural Hazards Mitigation Center University of Missouri-Rolla
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1 New Challenges for Army Combat Engineers: Bomb Damage Assessment, Fire Damage Assessment, Evaluation of Diminished Capacity, and Developing New Strategies for Short, Medium and Long-term Mitigation/Repair J. David Rogers Natural Hazards Mitigation Center University of Missouri-Rolla
2 Tikrit Bridge Demolition by Iraqi Forces
3 Views From the Bridge
4 Bomb Damage Assessment Critical structures damaged by bombs and Improvised Explosive Devices must be evaluated for capacity. No clear cut methodologies or established protocol is presently included in combat engineering training syllabus to educate junior officers how to go about these tasks.
5 Bomb and fire-damaged bridge decks required immediate evaluation of diminished capacity. Then, decisions about what kinds of short, medium or long-term measures to effect repairs. At present, long-term repairs are generally turned over to civilian contractors.
6 Fire Damage Assessment
7 The traditional role of combat engineers has been Short-term term combat bridging only there long enough to win the battles
8 This view shows the longest floating river bridge assembled in a combat theater since World War II, across the Tigris River in Tikrit. A typical pontoon treadway bridge can be erected in just 6 hours, but would require two multi-role bridge companies, 36 Bridge Erection Boats, 80 Assault Float Bridge sections and 24/7 operability of the boats.
9 Tikrit Highway Bridge Assessment & Temporary Repairs
10 Temporary Bridge Solution
11 East Bound Traffic
12 Mabey Johnson Bridge end connections
13 Pier 8, east end Damaged Pier 7, west end
14 PIER 7 FRONT VIEW NORTH 1D MEASURE EXPANSION OF CRACKS 2D 3D 4D *Mostly surface damage cracks - do not require daily measurement
15 Bridge Pier Cap w/ Cantilever ends PIER 7 TOP VIEW Bridge Beam & MJ Bearing area MEASURE THE DEGREE OF DEFLECTION BETWEEN THE EAST AND WEST SIDE OF THE CANTILEVER (MAY REQUIRE SURVEY EQUIPMENT) 1E East bound traffic West bound traffic Using MJs 1F Bridge Pier 2F *Critical crack requires daily measurement MEASURE THE EXPANSION OF THE CRACK ALONG THE CAP OF THE CANTILEVER
16 PIER 7 SIDE VIEW Bridge super structure MEASURE DEFLECTION OF I-BEAM AT THE END OF THE CANTILEVER FOR INDICATION OF STRESS 1B 1A MEASURE THE EXPANSION OF THE CRACK ALONG THE END OF THE CANTILEVER 2A *Crack will not grow without crack on top of the pier cap growing Do not require daily measurement
17 Bridge Pier Cap w/ Cantilever ends PIER 7 BOTTOM VIEW Bridge Pier *Crack will not grow without crack on top of the pier cap growing Do not require daily measurement 1C MEASURE THE DISTANCE BETWEEN THE ENDS OR THE CRACKS UNDERNEATH THE CANTILEVER
18 Mabey Johnson spans placed on upstream side of tail span gaps on the Tikrit Bridge across the Tigris River. Note repair of Pier 7.
19 Tikrit Bridge AFB 2x M-J on Fixed Bridge 74 E C E E Tikrit Bridge Bypass Roads to Kirkuk Samarra Tirkrit Bridge LOCs
20 Potential Construction sites Bypass Route Length 24 km
21 Tikrit Bridge Bypass LD Bridge park & launch site MINE BOOM
22 Unprepared Abutment Tikrit By-Pass Construction Decisive Point Bridge to Shore Connection Landing Bay Deflection angle = 6.5% Median water level 2.1m 2.1m Deflection angle = 6.5% Total Deflection = 4.2m Water line Material added for elevation to median water level Rotating Junction Near shore (West side)
23 Unloading and moving Individual Pontoons Pontoons Specifications: 40,000lbs ea 2 sizes: 40 & 20 ft 7 ft deep 10 ft wide
24 Launching Individual Pontoons
25 Assembling Floating Pontoon Piers
26 Assembled Span Launched Launching Nose
27 Filling 40 ft pontoon with soil Before scuttling Fluted anchors doubled on line & Adjustable winches Anchoring: River bottom investigated by Army divers Buried transoms used as Dead-man anchors for end spans Fluted anchors & pontoons filled with soil used for intermediate spans
28 Half-Complete Mabey Johnson Float Bridge
29 12 month pontoon bridge constructed by Bechtel across Tigris River Segmented Mabey-Johnson trusses laid on rectangular steel pontoons. Each pontoon weighed 40 kips; lashed together in groups shown here. MLC 110 kip vehicle capacity, suitable for transit of M1A1 Abrams on transporters
30 Opening and Proofing
31 Completed Mabey Johnson Float Bridge
32 Old Bailey Bridge across Tigris Estuary (MLC 40) Armored Vehicle Launched Bridge (AVLB) MLC 70 Lateral Sway supports
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