Tag Archives: Seattle

Ballard Siphon Replacement Rebid

This project included construction of launch and retrieval shafts and 2,100 feet of 114-inch segmentally lined tunnel with an 85.5-inch diameter final liner. Additionally, two existing 36-inch wood stave pipelines were slip-lined with steel liners. Common when the siphon was originally constructed, the original pipes were similar to wooden barrels with metal compression bands holding the … Continue reading Ballard Siphon Replacement Rebid

Use of German excavation machine on Ship Canal tunnel a first for U.S.

King County is getting ready to use a shaft excavation machine that will be the first of its kind in North America. James W. Fowler Co., the general contactor, is using it to build a 30-foot diameter, 145-foot deep launching portal for a tunnel boring machine. It’s all part of a $38 million project to … Continue reading Use of German excavation machine on Ship Canal tunnel a first for U.S.