Sika - Building Trust
DSC_1348_tunnel3_web

Waterproofing 125 Feet Underground!

DSC_1315_tunnel_webSeattle, WA – The $1.9 billion University Link Extension for Seattle’s Light Rail will connect the University of Washington and Capitol Hill to downtown Seattle. The twin-bored tunnels will sit 125 feet underground as they pass underneath homes, business, and even the I-5 freeway. Using a massive tunnel boring machine, the Seatte ground was excavated without causing instability at the surface. Merritt Ridgeley from Wisko America, Inc. took us into the tunnel to see this exciting project. At our point of entry, the tunnel expanded over a mile and a half in two directions. We were able to see Wisko using Sika Greenstreak waterproofing products up close.

There are 23 cross-passages in this section that need waterproofing.

Concrete segments that line the tunnel use a self-sealing gasket, but the cross-passages between the two alternating tunnels do not include these segments. Wisko is installing Sika Greenstreak Fuko hoses to waterproof the concrete barrier between the wet Seattle ground and the tunnel. The Fuko hoses are placed in a PVC geomembrane and cast into the concrete to provide a water impermeable lining. Due to the high water concentration in Seattle, the ground had to be frozen throughout the tunnel’s excavation. Merritt explained to us that after several months any leaks caused by the thawing ground will become apparent. The Fuko hose system provides a secondary water containment method by allowing Sika grout to be pumped directly into leaking areas as needed. Other Sika products are also used throughout the tunnel, including Sika Armatec 110 and Sika Repair 223.

The tunnel is over 3 miles long!

 

DSC_1334_tunnel5_webWisko is also currently using Sika Greenstreak products to waterproof other tunnels across the United States. Wisko is currently waterproofing Grand Central Terminal in New York City, which has more platforms that any railroad station in the world. In the ongoing Ohio River Tunnel Project, Wisko is using Sika Greenstreak to cover sections of the tunnel that are up to 120 feet across. Considering the extensive experience of Wisko, the cross-passage waterproofing project for the Seattle Light Rail is sure to go smoothly. The tunnel project is expected to be completed in 2021.

Wisko’s Rafael Echeverria hard at work.

Share

2 Comments

  1. John Beckwith

    Simply fascinating!

  2. Kyle Loyd

    Fantastic, great jobsite visit showcasing Wisko’s excellent work!

Leave a Reply

Your email address will not be published. Required fields are marked *

All comments will require moderation before being posted, thank you for you patience.

Sika USA’s Instagram

  • #tbt Last year #Sikaroofing introduced #InnovativeRoofProducts that are meeting building owner's needs and changing what you can expect from a roof. We are heading to the International #RoofingExpo Feb 6-8th, mark your calendar and stop by to learn more about the Sarnafil textured membrane, Liquid Flashing, Sika SolaRoof and Self-Adhered Sarnafil Membrane!
  • The Sika Interior Finishing Team would like to thank Swiff Train and all of the participants that visited our booth at the #DallasMarket 2018 in Grapevine, TX. For more information about our product range visit us at SikaSecure.com. #SikaSecure #SikaBond #SikaLevel #flooring
  • #sikaeveryday
  • The 2018 International #RoofingExpo is happening in New Orleans from Feb 6th-8th. We are headed there a day early to volunteer with @rebuildingtogether and the Roofing Community to give back. Visit the link on @roofingexpo's bio to learn more about he show and volunteer day. #giveback
  • Sika offers a variety of roofing products, from liquid applied to self adhered membranes and everything in between like non-penetrating solaroofs, green roofs, plaza decks and more. Join us Feb 7th at the Times Center in NYC for a free lunch and explore all the roofing options Sika has to offer. Register at sikaeveryday.com #sikaeveryday #successwithsika #sikaroofing
  • The Alamodome in San Antonio, Texas is ready to host 70,000 spectators for its events in 2018 with help of our PurCem and DecoFlake. #sikafloor covered 140,000 square feet of the @alamodomesa while replacing the old polished concrete floors. Check out the stadiums list of great events which have kicked off today! #successwithsika
  • Take 2018 to the next level with #SikaLevel Underlayments! Our innovative range of #underlayments include dust reduction, rapid drying speeds, and much more. Contact us at SikaSecure.com for more info to make your floors #SikaSecure
  • Are you ready for the Sika experience? Sika's got solutions for your every day building construction needs. Join us in NYC Feb 7th for an educational networking event and explore the trends and innovations defining our industry. Register at sikaeveryday.com today! #sikaeveryday
  • Happy New Year! Check out our #bestnine2017 post. We are excited for all the great event and project photos coming this year! #sikaeveryday
  • As we approach the new year, we would like to say thank you to all of our followers, supporters, customers and partners for making 2017 a great year! From all of us at Sika, we wish you all a wonderful and successful 2018! #happynewyear
  • Do you have a difficult substrate that you need to prime? Sika Level-02 EZ Primer is made for non-porous and difficult substrates with speedy drying times. 
#SikaSecure #SikaLevel #flooring
  • The popular Sika Every Day continuing education event series is heading to NYC! Save the date for February 7th, 2018 and stay tuned to find out the CEU or AIA credits that you can earn while enjoying a delicious lunch on us. #sikaeveryday #sika365

View More Photos on Instagram!