CONCRETE TECHNOLOGY CORPORATION

Georgia Pacific Outfall, Bellingham, WA

Georgia Pacific outfall pipe-beams being lowered to submerged pile caps

The 1.5 mile long outfall for the Georgia Pacific Corporation paper mill in Bellingham, WA, was constructed to carry treated effluent to the mouth of Bellingham Bay. 100-ton precast/prestressed pipe beams span between pile bents composed of precast pile caps and steel pipe piles. Each pipe is designed to carry dead, live, and earthquake loads as a beam between the pile cap and piles.

The precast pipes have a rubber "O" ring in a bell and spigot joint over the pile caps that allowed for rapid underwater assembly, adjustment for construction tolerances, and articulated movement in the event of seismic activity.

Products

Pipe Beams - 63 ea - 60" Diameter Pipe-beams; 53 @ 130-2", 10 @ 102'-6"

Pile Caps - 64 ea - 3'-0" x 11'-0" x 12'-0" precast pile caps

Pipe Fittings - 3 ea - end, angle and transition structures

Footbridge - 2 ea - 28" x 5'-0" x 66' prestressed channel beams

Features

Long-span pipe beams minimized the number of pile bents needed for the outfall foundation.
Maximum use of precast concrete elements kept expensive and difficult on-site work at a minimum.
Use of precast concrete allowed a high level of quality control, rapid production of standard units, and durable concrete for severe exposure conditions.

Georgia Pacific outfall pipe-beams loaded on barge at CTC plant

**Credits**
Owner	Georgia Pacific Corporation

Designer

Brown & Caldwell Engineers - System Design
BERGER/ABAM Engineers - Structural Design

General Contractor

A.H. Powers, Inc.

Precaster

Concrete Technology Corporation, Tacoma, Washington