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Re: CONCRETE: Combining Multiple Construction Tolerances

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My experience has been more with regular piles than with sheet piles, however, a tolerance of 3" (+-) may be difficult to achieve. It would seem to me that your choice will be between having a wall that is a minimum of 10" thick and up to 16", thick and having a crooked wall. For an underground pump vault my personal choice would be to accept the crooked wall in the interest of cost saving.

Sheet piling is also expensive; so you may want to look for a way to recover it if you haven't already thought of it. Two methods appear to me to be obvious: lightly attach sacrificial formwork to the sheet piling; or apply a heavy layer of asphalt spray or similar bond-breaker to the sheet piling and use the piling itself as formwork; a heavy layer (say 10mil) of poly might also do the job. Either way should allow the piling to be withdrawn after the concrete work is complete. Ways and means are usually at the contractor's discretion.



On 31/01/2015 5:29 PM, Polhemus, William wrote:
I'd like some opinions, guidance, communal wisdom, and profound insight.

I'd also like a 2015 Metallic Lime-Gold Porsche 911 Carrera Cabriolet...but that's not important right now.

I'm struggling with specifying construction tolerances for an underground
pump vault. The walls of the vault will be formed by driving steel sheet
piling to form the rectangular outline, roughly 38 feet by 25 feet, excavating to about 21 feet depth, putting in a 2 foot-thick seal slab, and then forming the walls of the box at the perimeter atop the seal slab. The walls are nominally 10" minimum thickness (measured from the inside face of the corrugated sheet pile wall).

I've had enough adventure just defining the tolerance for the sheet pile - apparently U.S. sheet pile producers and constructors don't like to talk about tolerances out loud. I can't imagine why not. #RollsEyes

I've finally hit upon the notion of specifying the tolerance from British
Standard EN 12063:1999 Paragraph 8.6.1 (Found naughtily here:<>.

Truncated 3978 characters in the previous message to save energy.

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