Presentation on theme: "WisDOT - Bureau of Structures Brandan Burger & Dave Kiekbusch."— Presentation transcript:
WisDOT - Bureau of Structures Brandan Burger & Dave Kiekbusch
Anything structural – change in loading, structural capacity, pile locations If in doubt, call us! See Structures Contacts Handout Remind Contractor to go thru Construction Staff for answers
Measure Twice… Cut Once!
Send electronic files via to: Craig Wehrle: Girders, rails, exp. joints, bearings, etc. Steel fabrication Who inspects?: BOS Structures Maintenance BOS hired Consultants
Prestressed Concrete Girders Plant has one Quality Verification (QV) inspector Weekly plant - QV reports QV reports with girder acceptance recommendations are sent to region materials staff and forwarded to project personnel. Issues from the fabrication plant should NOT be re-visited at the job site. Final approval is made by project engineer at job site - any shipping or erection damage.
Initial sweep is critical Fabricators responsibility Measured at the plant Long term sweep only a concern IF intermediate diaphragms dont fit.
Mostly occurs w/ steel & wide flange (>4) prestressed girders Contractors responsibility Strapping top flanges & bracing bottom flanges NO welding to top flange of steel girders or prestressed girder rebar!
Proper rebar clearance Release joint straps ASAP – before set
Anchorage for Steel Railings Hold anchor bolts up – thread connection
Plan details for fill at wing tips Proper Fill = Minimize Future Erosion
What to look for: Materials Backfill – Material, Compaction Reinforcement – Strap Placement Panels – Damage, Filter Fabric Construction – Obstructions Drainage If designed and built correctly = Quality Product
Overhead sign supports, sign bridges, traffic signal monotubes, high mast lighting poles Contractors responsibility Anchor bolt tensioning: DT each structure Submit to the engineer - permanent project records Engineers responsibility Contact region traffic or maintenance - set up inspection as soon as each structure is complete
FOUNDATIONS: Too Low/Buried Removal of Excess Formwork Shaft/Bar Cage Not Plumb or Centered Missing Rodent Screen
ANCHOR BOLTS: Use of Lock Washer Out of Plumb Leveling Nuts Improper Tensioning
Bolted Connections: Missing Bolts on Truss Loose Bolts on Splice Prepped Splice Plates
Bolted Connections: Faying Surface Gap Use of Lock Washer Incorrect Bolt Size/Length
Sign Connections: Approved Hardware Oversized and slotted hole Over Tensioning Blank Signs and cover
Placing and Fastening Plastic chairs – support bottom mat of rebar Continuous chairs – support top mat of rebar off bottom mat NOT ALLOWED – individual plastic chairs to support top mat of rebar Reminder: Hardware incorporated in deck must be galvanized, epoxy coated, stainless steel, etc. Welding is not permitted on epoxy steel.
New Section 550: similar to STSP used for the last few years. Modified Gates – Required Driving Resistance Specification Covers: Steel, Cast in Place & Precast Concrete Piles Pile Points Providing test piles Driving piles Determining required driving resistance Preboring Pile redriving
Weld splices conforming to the AWS D1.1/D1.1M Structural Welding Code-Steel.
Contractor certifies the quality of field welds as follows: 1. Designate who inspects welding. Must be an AWS certified welding inspector (CWI) or a department-approved individual. 2. Evaluate field welding at suitable intervals. 3. Complete DT2320 for each structure 4. Submit form to the engineer - permanent project record.
If piles drive longer than plan length, pay for field splice Current policy: Splices paid as equivalent to the contract price for: HP piles = 9 feet per pile spliced Other piles = 6 feet per pile spliced ONE payment per pile. Possible revision for 2014
Section Painting: See the departments approved product list Paint Systems for Exposed Piling
Inspect temporary structures before opening to traffic Conform to NBIS & departments structure inspection manual Guidance in CMM: Chapter 5 Structures Contractors Responsibility Included in ASP 6 Submit DT2007 to the engineer & BOS Maintenance Section Inspector must be department-certified active team leader List online – see CMM
New Structural Approach Slabs US Highways & Interstates