SFOBB East Span Seismic Safety Project

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

• Applies to all Structural Steel

• Contractor responsible for QC

• CT has prerogative for QA

Welding

SFOBB East Span Seismic Safety Project

• 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

Welding QC

SFOBB East Span Seismic Safety Project

• Quality Assurance at Engineer discretion

• QA Inspector shall represent Engineer

Welding QA

SFOBB East Span Seismic Safety Project

• Steel Audits – General Steel Meeting– Contractor’s Self Audit– CT Audit

Structural Steel 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

• Consists of portions of piles, pile caps, pier columns and cap beams.

• Thermal Control Plan is required

• Demonstration pours are required

Mass Concrete

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