Tapertube™ Pile Saves MacMillian
Pier Job - Provincetown MA
by Jack Dougherty
test piles being unloaded at the pier
Piles were chosen to replace pipe piles that were unable to hold the load
because of apparent soil relaxation.
forensic engineer was hired by the Town in March 2001 to evaluate the load
tests done on the pipe piles that were installed under the contract specification.These
piles were 12 ¾” OD x.500 wall A.S.T.M. A-252 Grade 2 to be driven
to twice the design load of 80 tons.The forensic engineer found the testing
was done properly.
the Tapertube test piles.
Boston office of Haley & Aldrich first contacted us February 5, 2001
about this project.After some discussion, I suggested that the TAPERTUBE
Pile might be the solution to the problem.Several long conference calls
and exchanges of information followed.They also viewed the information
available on our web site to learn more about the TAPERTUBE Piles.Soon
after, they decided to set up a test pile program at the job to determine
if the TAPERTUBE pile would solve the soil relaxation problem.
The job had been delayed almost
five months and all parties were anxious to get the job moving. The
contractor, AGM Marine from Mushpee, MA was authorized to order six 12
3/4” piles plus six 14” piles all 60’ long with extra pipe for splicing.
All material 50 ksi yield.
piles in the water, ready for pier.
piles arrived at the job site mid March and John Dougherty and I drove
to the site to observe the unloading and installation.The driving was to
begin on Tuesday March 20.Five piles were installed three on Tuesday and
two on Wednesday.The weather was turning bad and no work would be done
on Thursday or Friday.
On March 27 I called Haley &
Aldrich office and was told that the TAPERTUBE Piles were re-driven with
no loss in capacity.
of pier, both old (on left) and new.
received an order for production piles following the completion of testing.The
pile chosen was the 8” x 14”x 15’ x .375 wall with a 14” x .375 wall pipe
extension; all 50 ksi material. A total of 208 TAPERTUBE Piles were ordered
for the project.All of the piles were coated with coal tar epoxy.
This project marked the first use
of the TAPERTUBE Piles in a marine environment.
The TAPERTUBE Pile has demonstrated
many times, to be a tough useful tool and capable of carrying heavy loads
in friction under difficult conditions in both public and private work.
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