Cofferdam Systems?
Cofferdam Systems?
(OP)
I am putting together a cost estimate for a bridge. The bridge is to be constructed in a remote northern location (northern Saskatchewan, near the NWT border, in Canada). The bridge is to cross a river with a bedrock bottom. I am wondering what alternatives I have for the bridge pier construction. Seeing as how the bottom of the river is bedrock, driven sheet piles are out of the question, as is the use of an earth type cofferdam. The width of the river is insufficient to allow an earth cofferdam without completely ubstructing the flow of the river. As well, an impermeable type fill material is unavailable due to isolation of the construction site.
The river is approximately 2.5 m (8.2') deep.
What cofferdam systems exist that would be suitable for this type of application?
Thank you for any help you may be able to provide.
The river is approximately 2.5 m (8.2') deep.
What cofferdam systems exist that would be suitable for this type of application?
Thank you for any help you may be able to provide.






RE: Cofferdam Systems?
The contractor constucted a traditional braced rectangular cofferdam (about 25 feet deep), but did not pump it. Then he constructed another braced, concentric, rectangular, closed sheet pile wall around the cofferdam. As I remember there was about a 3 feet spacing between the two concentric rectangles. Then he poured a concrete seal BETWEEN the two sheet pile rectangles. The seal worked well enough for the interior to be pumped and the pier constructed. Perhaps some version of this concept would work for you.
www.SlideRuleEra.net
RE: Cofferdam Systems?
RE: Cofferdam Systems?
Regards,

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