Dan Ambuhl, Specifications Engineer, Caltrans SFOBB East Span Seismic Safety Project
Selected Special Provisions • • Welding Structural Steel Audits Temporary Towers Mass Concrete Cable System Steel Structures Main Span Steel Structures YBI SFOBB East Span Seismic Safety Project
Welding • Applies to all Structural Steel • Contractor responsible for QC • CT has prerogative for QA SFOBB East Span Seismic Safety Project
Welding QC • QC Plan is required • Quality Control Plan – CT Qualification Requirement – All UT personnel must be qualified by CT • QC Inspector shall represent Contractor • Document Submittals SFOBB East Span Seismic Safety Project
Welding QA • Quality Assurance at Engineer discretion • QA Inspector shall represent Engineer SFOBB East Span Seismic Safety Project
Structural Steel Audit • Steel Audits – General Steel Meeting – Contractor’s Self Audit – CT Audit SFOBB East Span Seismic Safety Project
Temporary Towers • Footings – Timber piles will not be allowed – Driving system submittal is required – Dynamic monitoring is required • Towers – Specified to be made of steel – Working drawings will be required – Buy America does not apply to temporary works SFOBB East Span Seismic Safety Project
Mass Concrete • Consists of portions of piles, pile caps, pier columns and cap beams. • Thermal Control Plan is required • Demonstration pours are required SFOBB East Span Seismic Safety Project
Cable System • Cable System – Cable Wire Rod – PPWS Strand – S-Wire Cable Wrapping – Corrosion System • Suspender System SFOBB East Span Seismic Safety Project
Steel Structures Main Span • Typical Structural Steel – Girders, plates, connections – Full Scale Mock ups will be required, for details shown on the plans SFOBB East Span Seismic Safety Project
Steel Structures Main Span • Non Typical Structural Steel – Hinge Pipe Beams – Castings • Tower Saddle may be cast in max. of 3 pieces – Modular Joint Seal Assemblies, Circular Segmented Bearings – Travelers – Substation components & service platforms SFOBB East Span Seismic Safety Project
Steel Structures YBI • All structural steel is on the Temporary Detour Structure • Buy America does not apply to temporary structures SFOBB East Span Seismic Safety Project
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