Precast Concrete Piles
Precast Concrete Piles
(OP)
Anyone have any details on precast concrete pile splices, and pile cut-offs? Interested in both plain reinforced and prestressed piles.
How would you cut off the pile at the pile cut-off elevation and dowel it to the pile cap or slab if it's a prestressed pile?
How would you cut off the pile at the pile cut-off elevation and dowel it to the pile cap or slab if it's a prestressed pile?






RE: Precast Concrete Piles
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Click on Volume 4, go down to sheet series 600, specifically 601: "Square Prestressed Concrete Pile Splices".
Obviously you can't just take the drawings and use them but they may give you ideas. You'll have to do all the engineering calculations and drawing production to see if they actually fit your application.
RE: Precast Concrete Piles
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In my bridge contractor days a common way was to cut (chip) the concrete with a pneumatic pavement breaker and snip the stands (or rebar in precast concrete) with an acetylene torch. When cut, the stands would snap with a "twang" sound but not recoil since both side of the cut (the pile itself and the pile cutoff) had the remaining length of the stands completely encased in concrete. This approach was both slow & labor intensive, concrete saws are probably better suited and more available now.
If dowels were needed, the top of the pile was drilled, axially (after cut off), and rebar grouted in place.
www.SlideRuleEra.net
RE: Precast Concrete Piles
RE: Precast Concrete Piles
Regards,
Lutfi
RE: Precast Concrete Piles
RE: Precast Concrete Piles
There was a show last night on the History Channel on the construction of the Lake Pontchartrain Bridge that had pretty good coverage on the manufacture and installation of the concrete piles.
The piles used were spun cast sections (? 4 5/8" tk x 30'lg) with 12 or more holes longitudinal holes for tensioning, the sections were stacked and post tensioned and grouted. At the site the piles were placed with a steam driven hammer and trimmed to height with a concrete saw. I think they call the cap a bar cap, which had been precast onshore and from the picture the cap was anchored to the pilings with a concrete plug. There were circular reinforcing cages attached to the bar. The precast bridge sections were set on the bar. I didn't see but one pin on at each corner. This maybe the reason it came apart like our I-10 bridge.
This took place in the 50's but a very similar system was recently used on 3 fairly long bridges across our bay. The only difference was that more of the caps were cast in place.
RE: Precast Concrete Piles
http://www.vulcanhammer.net/info/pilecutter.php
RE: Precast Concrete Piles
Caltrans (Californis DOT) also shows reinforcing details in their Standard Plans manual.