precast segmental concrete bridges a

Arthur Palmer, Parsons Brinckerhoff

A 2007 pictorial review of a precast segmental yard setup

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Topics �  Overview of Tukwila Link Light Rail Project �  Cashmere Casting Yard

�  Casting Yard Layout �  Geometry Control Basics �  Daily Operations

�  Span-‐by-‐Span -‐ Typical Segment Casting �  Span-‐by-‐Span -‐ Pier Segment Casting �  Balanced Cantilever -‐ Segment Casting

�  Storage Yard �  Shipping �  Site Erection �  Other Segmental Projects �  Other Casting Yards

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Tukwila Link Light Rail

� Owner: Sound Transit Authority �  Design Engineer: Hatch Mott MacDonald �  Bridge Designer: International Bridge Technologies �  Construction Manager: Parsons Brinckerhoff Construction Services

�  Contractor: PCL Civil Constructors, Inc. �  Construction Engineer: T.Y. Lin International �  Precaster: Bethlehem Construction �  Post-‐Tensioning Supplier: Schwager Davis, Inc.

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Types of Precast Segmental Construc;on �  Span-‐by-‐Span Construction

� Majority Are 120’ Simple Span Structures �  All Precast Concrete Components

� Balanced Cantilever Construction � Multi-‐Span Structures �  CIP Main Piers �  Remaining Components are Precast Concrete

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Cas;ng Yard Layout

(5) Typical Matchcasting Forms (5) Typical Rebar Jigs (2) Pier Matchcasting Forms (2) Pier Rebar Jigs (2) Balanced Cantilever Matchcasting Forms (2) Balanced Cantilever Rebar Jigs