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EXISTING TIMBER STRUCTURES BUILT IN LATE 30’s

EXISTING TIMBER STRUCTURES BUILT IN LATE 30’s. BRIDGES ARE FUNCTIONALLY OBSOLETE AND STRUCTURALLY DEFICIENT MAINTENANCE RUNNING OUT OF REPAIR OPTIONS NEW STRUCTURES REQUIRED. CONSTRUCTION CHALLENGES. HIGH TRAFFIC VOLUME (19,000 VPD) POOR SOILS ADJACENT TO ROADWAY

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EXISTING TIMBER STRUCTURES BUILT IN LATE 30’s

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  1. EXISTING TIMBER STRUCTURES BUILT IN LATE 30’s BRIDGES ARE FUNCTIONALLY OBSOLETE AND STRUCTURALLY DEFICIENT MAINTENANCE RUNNING OUT OF REPAIR OPTIONS NEW STRUCTURES REQUIRED

  2. CONSTRUCTION CHALLENGES • HIGH TRAFFIC VOLUME (19,000 VPD) • POOR SOILS ADJACENT TO ROADWAY • CLOSING THE ROAD ONLY VIABLE OPTION • LOCAL ROADWAY CLOSURE CONSTRAINTS • TIGHT CONSTRUCTION TIMEFRAMES • LONG DETOUR ROUTES • POLITICAL PRESSURE NOT TO CLOSE ROADWAY FROM SUN PRAIRIE AND DEFOREST

  3. PROJECT LIMITS B-13-609 SKEWED BRIDGE B-13-608 NON-SKEWED BRIDGE

  4. Accelerated bridge construction techniques

  5. SWINGING IN THE EDGE GIRDER

  6. GIRDERS SET

  7. DIFFICULT TO SET ON A SKEW

  8. LOOK DOWN THE BAY BETWEEN ‘T’ SECTIONS

  9. REBAR TIED, READY TO FORM AND POUR DECK

  10. BENEFITS OF USING PRECAST • SIGNICANTLY LESS DECK FORMING REQUIRED • LESS TIME TO TIE REINFORCEMENT STEEL • LESS TIME REQUIRED TO PLACE DECK CONCRETE • LESS TIME TO STRIP DECK • PRECAST CONCRETE PLACED IN CONTROLLED ENVIRONMENT

  11. LESSONS LEARNED • PRECAST SUPPLIER PROPOSED MANY REVISIONS TO REINFORCEMENT LAYOUT AND SOME BEAM GEOMETRY • MOST REVISIONS REQUESTED FOR EASE OF PRECASTING, EASE OF BEAM SETTING, AND STEEL REINFORCEMENT CLEARANCE ISSUES • SKEWED BRIDGES PRESENT SOME CHALLENGES IN SETTING THE INVERTED T GIRDERS

  12. LESSONS LEARNED (cont’d) • ABUTMENT GIRDER SEAT ELEVATIONS NEED TO BE CLEARLY DEFINED IN PLANS • ABUTMENT CONCRETE FINISHERS NEED SOMETHING TO FINISH TO • THICKER NEOPRENE BEARING PADS WERE NECESSARY ON SKEWED BRIDGE BECAUSE OF POOR FINISHING • SLIGHTLY WIDER ABUTMENT BODY WOULD HAVE MADE THE SETTING OF INVERTED T’S EASIER

  13. TIMELINE TO CONSTRUCT B-13-608 • STANDARD TYPE OF ABUTMENTS UTILIZED • B-13-608 (NON-SKEWED BRIDGE) • OCT. 15: FINAL ABUTMENT POURED, BY SPEC. - WAIT 2 DAYS FOR CURE • OCT. 17: INVERTED T GIRDERS SET • OCT. 18: SET DECK REBAR, END AND SIDE DECK FORMS SET • OCT. 19: POURED DECK

  14. TIMELINE TO CONSTRUCT B-13-609 • BRIDGE HAS SKEWED ABUTMENTS AND HAD ISSUES WITH HOW THE GIRDERS RESTED ON THE UNEVEN SEATS • HAD TO ORDER THICKER NEOPRENE BEARING PADS SO TIME SAVINGS NOT FULLY REALIZED

  15. TIMELINE B-13-609 (cont’d) • OCT. 14: POURED LAST ABUTMENT • OCT. 16: INVERTED T GIRDERS ARRIVE, DIFFICULTY WITH UNEVEN BEAM SEATS • OCT. 17 to 22: CREWS TIED STEEL, HELPED OUT ON OTHER STRUCTURE • OCT. 23: NEW BEARING PADS ARRIVE, WORK TILL 10 PM WITH FORMING AND SETTING REBAR • OCT. 24: POURED DECK

  16. QUESTIONS? THANKS TO JOE JIRSA OF KL ENGR. FOR HIS ASSISTANCE

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