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prestressed piles

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     I could use the help of anyone who has experience designing prestressed 
concrete piles. I need to design a 100 foot long pile to take 240 kips of 
vertical load and 45 kips of horizontal load. The top 25 feet will be a 
composite pile,  30" diameter drilled pier with conventional reinforcing and 
the prestressed pile extending up through the composite length to the pile cap. 
The idea is to predrill the 30" section then drill a smaller hole for the 
remaining 75 feet. The prestressed pile will then be driven and a rebar cage 
lower around it for the first 25 feet. The soils engineer has given the 240 kip 
load for a 14" diameter pile. The top 25 feet will take the 45 kip horizontal 
     I have been reading about prestressed piles but the information I have is 
not  specific and none have any thing about a composite pile. As this project 
is to go for a review of the 100% package in three weeks time is important to 
me. Any help on references which include design examples of prestressed piles 
would be appreciative. Additionally any pitfalls on using pile splices would 
also be appreciated.

Thanks in advance
Acie Chance

P.S.  Phone (562) 908-7411 ext. 2010
        Fax.    (562) 908-4270
        e-mail  achance

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