Hollow Spun Piles

[geo77]

Anyone have experience with hollow spun piles? I was wondering about the advantages and disadvantages of these piles. Also, any information on the standards and specifications used for their design would be helpful.

 

[hokie66]

Tapered spun poles have been used for a long time as power poles. Straight spun poles have been used as precast columns in buildings, but I have not heard of them being used as piles. I would question the economics of spun piles relative to typical square precast piles.

 

[PEinc]

Didn't that building that fell over in China not too long ago use hollow, spun concrete piles?

http://www.PeirceEngineering.com

 

[Qshake]

cylindrical hollow spun piles were used for the original 23 mile Chesapeake Bay Bridge and Tunnel.

I'm not sure if the same pile would be economical for all solutions today pending the applications. As an example, if you google the CBBT you'll see reptition upon repetition of concrete bents and that makes a good case for economy of size/numbers. But if you had a relatively small number, I would think they are very expensive.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

 

[dgillette]

PEinc - I'm thinking those concrete piles in China were pre-cast with a mandrel to make the doughnut hole.

 

[hokie66]

One advantage of spun columns for use in structures like the CBBT is that the spinning process makes for highly consolidated, so very impervious concrete. I imagine they used the void for reinforcement and infill concrete for continuity with the headstocks. The spinning process leaves a segment of laitance which needs to be removed.

 

[PEinc]

dgillette, it looked to me like the piles were precast (spun). I guess we will have to try to find the old internet stories on the China building collapse.

http://www.PeirceEngineering.com

 

[BigHarvey]

These piles are normally pre-stressed. I remember having seen some of these on marine jobs.

 

[hokie66]

According to this, the CBBT pile/columns were cast in short lengths and then stressed into longer sections.

 

[hokie66]

Forgot to attach it.

http://www.roadstothefuture.com/VASCE-History/VASCE-CBBT.htm

 

[BAretired]

Photos of the collapsed building in Shanghai:

http://www.google.ca/images?hl=&q=s...mKCIqcsQP2ycX3AQ&ved=0CCEQsAQ&biw=896&bih=512

BA

 

[irawanfirmansyah]

Prestressed concrete spun piles are precast. They are centrifugal casted result in high density concrete (fc'= 50 MPa). Spun piles are competitive in price and their quality are tightly controlled.
Available pile dimensions are as follows:
Diameter(mm): 350 400 450 500 600
Thickness(mm): 70 75 80 90 100
Length of each section: 6 - 16 m
Given properties are: area of steel, area of concrete, sect modulus, effective prestress, cracking moment and ult moment. Spun piles have been used for multy storey buildings, industrial buildings, bridges.

 

[jwripple]

Any ideas to the loads and moments experienced in the building collapse? It looks to me that it wouldn't take much to snap those hollow piles with such soft soil around the foundation and the garage excavation.

 

[lgoarch]

We regularly specify and design with precast/pre-stressed piles (square or round as well as hollow fiberglass composite piles for coastal projects (also referred to as crawl-thru/drive-thru basement or elevated structures).

The pre-stressed piling can: transition to a pre-stressed, cast-in-place, hybrid or timber floor system, carry a higher moment with the same skin friction as timber, and require less foundation (at ground level) for the structural slab, sometimes no slab at all. Check out

http://www.gateprecast.com

&

http://www.flexicoreoftexas.com

more info on Pre-Cast/Stressed Concrete products
The hollow fiberglass composite piles allow you to design a very tall structure with Cast-in-place column/piles by increasing the monolithic height vs break-out point where most forms would fail, we have never used the HFCP's as a hollow unit - but I am told that in a bulk heading or pier application they are wonderful. Check out

http://www.pearsonpiling.com

for more info on HFCP’s including Piling Specifications, Test Data and Installation Guidelines.