March/April 2021 - 20

(2.7 m) thick blanket was required due to deeper excavation.
Uplift forces were resisted by four rows of tie-downs spaced at
10 ft (3 m) on center. Tie-down design loads ranged from 35 to
55 tons (32 to 50 m tons).
The temporary deck at Avenue B, besides providing a work
platform for construction equipment and lateral support for
sheeting during excavation, was designed to support a hanger
system for maintaining critical utilities running along the
center of the entire length of the excavation. These utilities
included two Con Edison oil-o-static lines, a 20 in (50.8 cm)
water main and a 12 in (30.5 cm) steam line.
The excavation occurred in stages, and internal bracing was
installed and preloaded as the excavation proceeded to the top
of the jet grout blanket. The substation structural box was then
constructed of reinforced concrete in stages, as the bracing was
removed on the way up.

Conclusion
The alternative excavation support scheme developed and
implemented for construction of subway improvements at
the Manhattan end of the Canarsie Tunnel Rehabilitation
Project resulted in significant savings in cost and time. That
was true when compared to the originally suggested rigid
walls, while the alternative also provided groundwater cut off
and minimized detrimental lateral movement and

20 * DEEP FOUNDATIONS * MAR/APR 2021

settlement of all adjacent structures, including the existing
subway, buildings and utilities. All work was able to be
performed while the First Avenue Station remained open to
the public and with full train service.

Acknowledgements
The jet grout blanket and tie-down subcontractor was
Nicholson Construction. Giken of Japan, which has a Giken
America office in New York City, provided the Silent Piler and
Judlau contractor team support. The New York City Transit
Authority embraced the alternate solutions and innovative
ideas crucial to design review and approval and ultimately to
construction success.

Sitotaw Y. Fantaye, P.E., is a principal at Mueser Rutledge Consulting
Engineers who specializes in design of foundations, underpinning and
excavation support systems. He has over 26 years of design experience, and has
worked on several challenging projects related to NYCT Subway structures.
Alice Arana, P.E., is a senior associate at Mueser Rutledge Consulting
Engineers with over 32 years of experience in the design of excavation support
systems, foundations and underpinning.
Sean Butler, P.E., is a senior engineer at Mueser Rutledge Consulting
Engineers. He has over 8 years of design and field inspection experience
working with secant walls and slurry walls, as well as more conventional
excavation support systems.



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March/April 2021

Table of Contents for the Digital Edition of March/April 2021

TOC
March/April 2021 - Intro
March/April 2021 - 1
March/April 2021 - 2
March/April 2021 - TOC
March/April 2021 - 4
March/April 2021 - 5
March/April 2021 - 6
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https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2020
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