(401 Chambers Street - Update)
On this narrow street two trucks are being unloaded tail to tail.
Two more trucks wait down the street.
The test piles for this job were completed in early July, but production piles did not actually start until the last week in September.  These long start up delays seem to be very common now.  All the pipe was on the job by the end of October and about 70% of the piles have been driven.
Space is a premium on this site.
There are four trucks waiting to be unloaded.
The driving went well according to Superintendent Yan Wong.  This casing pile is very tough and not easily damaged.

The jobsite is very tight and unloading and storing the pipe created some problems.  A crane was brought in for the day to do the unloading and stacking of the pipe.  The crane was positioned in the street and the pipe was unloaded directly into the excavation.  This generally went well except for a few trucks whose drivers could not seem to find New York City, or had engine trouble or got sick or were abducted by little green men; or was that women?

DFP S-1800 splice rings ready for use.
The piles were about 80' long on average.  The Contractor chose to use the DFP S-1800 splice ring to join pile sections.  There are other similar products on the market, but load transfer must be considered.  Some products have a ledge or pipe stop that is only 3/8" wide and does not allow the full section of the pile to transfer load to the lower section of pile.  In this case the wall thickness of the pipe is .545, the ledge on the 9 5/8" DFP S-1800 is .625.  This allows for full load transfer to the lower section of the pile.  Additionally the DFP S-1800 splice ring is made with a low alloy steel with a 60 ksi yield strength.

Looking northeast from the site.
Piles in this section are finished.
Through independent laboratory tests this pipe is determined to be a minimum of 90 ksi yield.  Under the B.O.C.A. code you could use 35% of 90 ksi or 31.5 ksi on the steel alone.  Since the steel area of this 9 5/8" X .545 wall pipe is 15.54 in. square the steel could carry a working load of 490 kips or 245 tons.  The piles were load tested to 320 tons for 96 hours.

Copyright 1997 Pileline Publishing