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Contractors World International Vol 6 No 4

USA

Piling for High Rise Construction

In San Francisco

Malcolm has successfully completed the installation of 44

deep foundation shafts for the new 181 Freemont Street,

a new 800 ft (244 m), 55 Story building in San Francisco.

The office high-rise will become the second tallest build-

ing in San Francisco.

The building sits on a landfill where the bay used to

encroach and called for the implementation of shafts

averaging 262 ft / 80 m deep with 5 to 6 ft (1.82 m) in

diameter to support the building's foundation. To date the

shafts for 181 Freemont are the deepest on record for San

Francisco.

The most challenging part of the project so far in-

volved the design and setup of the 140 ft (42.67 m) by

140 ft (42.67 m) job site.

The required equipment for the project included a 180

ton crane, a Bauer BG 46 Drill Rig, 7 Baker 21,000 gallon

open tanks (each measuring 8.5 ft /1.98 m wide by 30 ft

/9.14 m long), and all the necessary tools and ancillary

machines. To create additional storage, the Malcolm team

erected scaffolding over the Baker tanks.

Eleazar Sotelo, Malcolm's Project Manager said:

"Logistics were critical for this project. The 262 ft

(80 m) cages for the shafts were delivered in

three 72 ft (22 m) sections during the evening

when traffic was at a minimum. The timing was

critical to keep the project on schedule."

Malcolm is under contract with Level 10 Construc-

tion to provide drilling, shoring with CSM, excavation and

internal bracing, and foundation services. Now that the

shafts are finished the Malcolm team will move into exca-

vation.

Bauer

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