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No Cell Phones, Please.

No Cell Phones, Please. Thank You. Specialty Foundation Construction. Jet Grouting Drilled Micropiles Vibratory Ground Improvement & Stone Columns Construction Drilling, Grouting & Anchors. Central Artery / Tunnel Project Contract C19E1 Leverett Circle Connector - Bridge Pier

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No Cell Phones, Please.

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  1. No Cell Phones, Please. Thank You.

  2. Specialty Foundation Construction Jet Grouting Drilled Micropiles Vibratory Ground Improvement & Stone Columns Construction Drilling, Grouting & Anchors Central Artery / Tunnel Project Contract C19E1 Leverett Circle Connector - Bridge Pier Boston, Massachusetts Presented By: Pier Luigi Iovino, Division President Division of Layne Christensen Company

  3. Design Applications APPLICATION… • Support of excavation for tunnel roof Patented reinforced jet grouting was used to construct a continuous secant wall for a 18 foot deep support of excavation system directly adjacent to live tracks and diesel locomotives within Boston’s busy North Station commuter rail facility. The patented system was used in lieu of contract designed drilled soldier piles, lagging and permeation grouting.

  4. Design Applications INSTALLATION TECHNIQUES… • Unlimited headroom – single step process, using patented reinforced jet grouted columns • Limited headroom – two step process, installing drilled micropiles and jet grouting between piles

  5. Design Applications SIGNIFICANCE… • Created retaining structure as a solid unit, although the mechanics of the soil were the greatest obstacle in the design. • The use of jet grouting offers more homogenous soil properties, with clearly stated soil characteristics. • Drilled micropiles continue to absorb the stress.

  6. Tunnels under North Station

  7. Plan of Primary Bulkheads for Tunnel Roof

  8. Typical Primary Bulkheads Detail for Tunnel Roof

  9. Cross-Section of Primary Bulkheads

  10. Geotech Soil Conditions Report

  11. Site Constraints forInstallation

  12. Installation under Tracks

  13. Jet Grouting between installed Drilled micropiles

  14. Installation in Progress

  15. CA/T Leverett Circle Bridge Pier SOE

  16. CA/T North Station Tunnel Bulkheads The bulkhead was used between every 2 tracks for planned sequences of allowable track outages.

  17. Experienced. Equipped. Committed. Boston • Richmond • Salt Lake City • Los Angeles • Seattle Pittsburgh • Hawaii • Puerto Rico • Italy www.laynechristensen.com • 888-79-LAYNE

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