PRESERVING LOUISIANA S INFRASTRUCTURE: US190 MISSISSIPPI RIVER BRIDGE
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1 PRESERVING LOUISIANA S INFRASTRUCTURE: US190 MISSISSIPPI RIVER BRIDGE
2 Overview 1. Project Objectives 2. Bridge Data 3. Timeline 4. Existing Condition 5. Sequence of Coating and Repair Operations 6. Major Repair Items 7. Environmental Monitoring 8. Special Challenges 9. Rehabilitated Condition 10. Closing / Questions
3 Huey P Long US-190 Mississippi River Bridge The Huey P. Long Bridge is a continuous steel cantilever truss bridge over the Mississippi River carrying US 190 (Airline Highway) and one rail line between East Baton Rouge Parish, Louisiana and West Baton Rouge Parish, Louisiana View of the bridge from the Capital Building Observatory looking South
4 Project Objectives 1. To clean and paint the steel bridge substructure and superstructure components 2. To evaluate and repair or replace deteriorated steel truss span and deck girder span members, as well as steel and concrete substructure components 3. To repair or replace deteriorated or damaged roadway components within the bridge right-of-way 4. To preserve the bridge for continued usage in the 21st century with minimal disruption to roadway, rail, and river traffic
5 Bridge / Project Data 1. Bridge Type: Continuous Steel Cantilever Truss 2. Location: Mississippi River Milepost Year Completed: 1940, widened in Clearance: 111 feet AMSL 5. Traffic: ADT is 28,388; Rail carries 5-6 trains per day
6 Project Data 1. Total length of project: ½ from East highway abutment to West highway abutment 2. Estimated Square Feet for Cleaning and Painting: 3,675,420 from East highway abutment to West highway abutment 3. Total Original Project Cost: $74,849, Current Project Cost: $78,371, Current Project Completion: 98% 6. Current Overrun: 4.71%
7 Timeline
8 Timeline Project start: Notice to Proceed June 28, Day Assembly Period. Construction began September 24, Project completion date projected for April Working Days: 858 (began as 520 before construction) Calendar days: 3 years and 8 months to date
9 Existing Condition Bridge was last painted in the 1980 s. Existing coating was lead containing. Extensive pack rust, crevice, and pitting corrosion, resulting in areas of significantly reduced metalwork section to member components and fasteners. General coating breakdown and surface corrosion. Significant dirt and debris accumulations within some members. Poor roadway joint conditions. Concrete was in relatively good condition in most locations.
10 Existing Condition
11 Existing Condition
12 Existing Condition
13 Existing Condition
14 Sequence of Coating and Repair Operations 1. Containment (Class 1A) 2. Pressure washing (5,000 psi) 3. Chloride, Sulphate and Nitrate (CSN) testing for Surface Contaminants 4. Blast Cleaning to SSPC SP-10 and Hand & Power Tool Removal of Areas of Pack Rust 5. Prime Coat Application (Organic Zinc Rich) 6. Prime Coat Touch-up 7. Post-Blast Structural Inspections 8. Structural Repairs 9. Post-Structural Repairs Sequence of Painting
15 Project Clean & Paint Cost Breakdown Cleaning and Painting of approximately 3.6 million square feet. Lump Sum Bid Price for Painting of approximately 50 million dollars. Approximately $13.45 per square foot for painting.
16 Project Clean & Paint Cost Breakdown
17 Containments - Approaches
18 Girder Containments Approaches Platform Cables, Metal Decking over Roadways
19 Girder Containments Approaches Platform Cables, Fencing and Tarps
20 Tower Containments Approaches Temporary Traffic Barriers Anchored Cables for Tarps
21 Containment
22 Containment
23 Containment
24 Containment Entryway
25 Inside the Tower Containment
26 Containments - Main Bridge
27 Containments - Main Bridge
28 Containments - Main Bridge
29 Containments - Main Bridge
30 Containments - Main Bridge
31 Pressure Washing
32 Pressure Washing
33 Chloride, Sulphate and Nitrate (CSN) Testing
34 Abrasive testing Oil testing Conductivity testing
35 Blast Cleaning
36 Blast Cleaning
37 Blast Cleaning
38 Blast Cleaning
39 Prime Coat Application
40 Post-Blast Structural Inspections Used to determine if additional repairs were required due to section losses after corrosion removal Also used to determine required deteriorated rivet replacement that was necessary (per rivet) Each was conducted jointly with the Contractor after prime coat application Quantities of items were recorded and agreed upon daily, then compared to bid items Final document was produced for record, altered quantities were captured in periodic change orders
41 Post-Blast Structural Inspections
42 Structural Repairs Clean and prime coat existing metalwork and faying surfaces to receive repairs Install or conduct repairs i.e. gusset plate clips, replace rivets, full or partial member replacement, etc. Install mechanically galvanized fasteners at repairs.
43 Major Repair Items
44 Approach Bent Anchor Bolt Replacement Boh Bros conducted concrete pedestal expansion work and anchor bolt installation, American Bridge conducted steel bracket installation and connection to the bent columns. Required 1908 CY of excavation, 585 CY of concrete, 288 anchor bolts, and 144 brackets.
45 Approach Bent Anchor Bolt Replacement
46 Approach Bent Anchor Bolt Replacement
47 Approach Bent Anchor Bolt Replacement
48 Rivet Removal and HS Bolt Replacement 106,000 projected, 47,346 conducted Replacement criteria was agreed upon prior to work beginning (MM created, all parties consented) American Bridge conducted this work. Required reconsideration once approach work was complete (differing conditions on main truss) Tracked and agreed upon daily between AB and MM Savings was used to pay for fabrication and installation of bottom chord perforation covers to mitigate future section loss
49 Rivet Removal and HS Bolt Replacement
50 Rivet Removal and HS Bolt Replacement
51 RR Stringer Stirrup Bearing Repairs 40 projected, 40 conducted American Bridge conducted this work Required evaluation after railroad closure, stringer jacking, and dismantling to determine if all repair types would be conducted Faying surfaces had to be prepped and coated during closure 14-hour rail closure agreed upon in advance, none went over 13 Final closure only lasted 7 hours
52 RR Stringer Stirrup Bearing Repairs
53 RR Stringer Stirrup Bearing Repairs
54 RR Stringer Stirrup Bearing Repairs
55 RR Stringer Stirrup Bearing Repairs
56 Power tool cleaning of faying surfaces and prime coating
57 RR Stringer Stirrup Bearing Repairs
58 RR Stringer Stirrup Bearing Repairs
59 RR Tower Bent Member Replacement 201 projected, 237 conducted American Bridge conducted this work Most required temporary bracing and had to be completed during the RR closure (members not allowed to be removed during rail traffic)
60 RR Tower Bent Member Replacement
61 RR Tower Bent Member Replacement
62 Post Structural Repairs Clean primed steel of dust, dirt and debris from repair activities Solvent clean to remove any oil, grease or grime deposits and solvent and hand tool clean mechanically galvanized fasteners to roughen the surface Prime coat touch-up areas of damaged primer and galvanizing of the installed fasteners.
63 Post Structural Repairs Sequence of Painting Clean and apply penetrating sealer to any areas of irremovable crevice corrosion Apply red tinted prime stripe coat Apply grey tinted epoxy intermediate stripe coat Apply white epoxy intermediate coat and touch-up Apply caulking to all gaps between plates ½ or less Apply Louisiana Grey polyurethane topcoat and touch-up
64 Penetrating Sealer Application
65 Cleaning of Galvanized Fasteners
66 Prime Stripe Coat Application
67 Intermediate Stripe Coat
68 Intermediate Coat Application
69 Topcoat Application Main Bridge
70 Topcoat Application - Approaches
71 Touch-up of Containment Contact Points
72 Environmental Monitoring
73 KGC Environmental Services Inc. Scope of Services Perform TSP-Lead high volume air monitoring during lead emission generating activities. Conduct visible emission and visible accumulation assessments in order to measure the containment system efficacy. Mitigate environmental risk by identifying potential issues before they occur. Ensure compliance with all laws, regulations and contract specifications pertaining to hazardous waste management, ambient air quality and protection of the environment. Conduct pre-job and post-job soil sampling. Provide detailed and legally defensible environmental data.
74 TSP-Lead Ambient Air Monitoring
75 TSP-Lead Ambient Air Monitoring
76 KGC Summary of Environmental Data Suspected Cause of (TSP-Lead)Air Quality Project Limit Exceedance Structural Repairs, Rivet Busting, Plate Clipping & Grinding Number of Exceedances 40 Blowing Down Without Full Containment & Ventilation Abrasive Blasting, Vacuuming & Recycling 14 Containment Dismantling 4 Site Clean-Up & Moving Equipment 2 17
77 Hazardous Waste Management
78 Hazardous Waste Management Number of Hazardous Waste Shipments 25 Number of 55 Gallon Waste Drums Used 1,085 Pounds of Hazardous Waste Recycled/Disposed 837,135 pounds
79 Challenges & Lessons Learned Sensitive Receptor Areas- multiple businesses and residences were extremely close to the bridge. In order to mitigate the risk associated with abrasive blasting a coating system that contained lead and chromium next to sensitive receptors, the contractor instituted special containment and housekeeping procedures. KGC performed 24 hour high volume sampling to confirm that the sensitive receptors were not being negatively impacted as a result of the contractor s activities. Structural Repairs including rivet busting, plate clipping and grinding disturbed lead coated faying surfaces. The majority of the TSP-lead air samples that were over the project limit were a result of the aforementioned activities. Engineering controls and high volume air monitoring should be considered when LADOTD performs repairs and maintenance on other projects where the existing coating system contains heavy metals. Housekeeping is Paramount - thorough vacuuming of lead dust and abrasives from steel members and containment tarps prior to containment dismantling is essential to keeping a safe work environment. As the blasting and painting crews progressed down the bridge, iron workers moved in to perform the necessary structural repairs. At times they worked in less than ideal work conditions.
80 Challenges & Lessons Learned Equipment Storage Yards Require the contractor to store all blasting and painting equipment and materials used on the project on state property. Otherwise, heavy metals that are invariably present on these items could be released onto public property opening the LADOTD to potential litigation and remedial efforts.
81 Special Challenges Water Ponding in Past Pitting Corrosion Lower Chord Horizontal Diaphragms
82 Special Challenges Slurry Blasting Tower Column Base Repairs
83 Special Challenges Slurry Blasting Tower Column Base Repairs
84 Special Challenges Slurry Blasting Outboard Roadway Railings
85 Containments- Bridge Rail
86 Special Challenges Slurry Blasting and Painting Outboard Roadway Railings
87 Special Challenges RR Coordination
88 Special Challenges Steel Repair and Inspection Access
89 Special Challenges Steel Repair and Inspection Access
90 Special Challenges - Snooper used for Final Touch-up of Platform Contact Points
91 Rehabilitated Condition
92 Rehabilitated Condition
93 Rehabilitated Condition
94 Rehabilitated Condition
95 Rehabilitated Condition
96
97 Closing / Questions
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