Hollow Spun Piles
Hollow Spun Piles
(OP)
Anyone have experience with hollow-spun piles (my situation being for floating marinas, so subjected to cyclic loading). I have heard that the spot-welding of the spiral cage to the prestressing strands causes low-fatigue life(?) A brief internet search revealed only foreign manufacturers of these piles; does that mean there is no current American standard, ASTM or otherwise? Also, a name of US manufacturer would be helpful. Thank you,






RE: Hollow Spun Piles
RE: Hollow Spun Piles
RE: Hollow Spun Piles
I don't know if either of these firms manufacture what you seek, but it's a start: Raymond International and Sherman Utility Poles. Sherman was recently purchased - can't recall who bought them out. Raymond used to make some monster spun cast concrete piles (65 inch diameter, and at least 124 feet long.) Sherman makes 60 ft long tapered poles - primarily for electrical distribution/transmission.
RE: Hollow Spun Piles
RE: Hollow Spun Piles
Many "good" ideas perform well for a long time because they are never subjected to the design conditions. I would want to see some test data, particularly cyclic loading.
Hughes in Central Florida used to produce a spun-cast utility pole. Don't know if they still do or if they produce piles.
RE: Hollow Spun Piles
I also could not find ACI or ASTM code about the hollow pile, but i have a copy of Korean standard here specifed for hollow pile. No cyclic test procedure is shown in the standard.
To get more information about hollow spun pile go to www.pci.org
If you need the name of manufacture companies out side US i will forward to you some.
RE: Hollow Spun Piles
Additionally, welding on or anywhere around prestressed strands should not be allowed. It doesn't take much heat to burn completely through one of these cables, and even weld splatter can cause the strands to break during tensioning.
RE: Hollow Spun Piles
The local pile guy suggested them, I was thinking precast square concrete piles. Anyway, they are from Malaysia. The website is http://www.icpb.com/
They appear to have good performance numbers. Plus, they are cheaper than domestic produced products, which I can't believe. I was told about $16/ft installed.
To answer some other comments made above, they are prestressing bars not cable, apparently, and the cage is prewelded by an automated machine before prestressing. Since the confining reinforcing is sprial wound around the bars, it can stretch as the rods are prestressed.
Don't know about code requirements yet, though. BUT, the concrete strength is great, over 11 ksi compressive strength.