Cofferdams

Working in the Dry: Cofferdams, In-River Construction, and the United States Army Corps of Engineers

“…If the past is indeed prologue, one may assume that now conventional steel sheet pile cellular cofferdams will persist, while improvements and refinements in the new technology are developed and introduced by Corps engineers working in the field. circular cell 84,89,98,108,127,133,134 ,136 circular steel sheet pile cells 72, 89,139 cloverleafcell 128 diaphragm or semi-circular cell 75, Ohio River type box.... 37,40,41,62,63,64,66,77,78,79,84,91,106,37,47,51,55,56,57,59,63,74,91,95,no,114 steel sheet pile .. 1,67,68,69,70,72,73,75,76,77,78,79,80,81,82,84,87,88,89,…”

“…circular cell 84,89,98,108,127,133,134 ,136 circular steel sheet pile cells 72, 89,139 cloverleafcell 128 diaphragm or semi-circular cell 75, Ohio River type box.... 37,40,41,62,63,64,66,77,78,79,84,91,106,37,47,51,55,56,57,59,63,74,91,95,no,114 steel sheet pile .. 1,67,68,69,70,72,73,75,76,77,78,79,80,81,82,84,87,88,89,91,94,95,97...…”

“…10,50,51 Lock and Dam No. 7 10,50,Lock and 33,34,35,37,41,42,43,56,81,103 River 5,8,9,10,11,32,33,36,38,40,41,43,44,45,46,47,50,52,53,57,60,62,64,65,66,77,78,79,80,81,82,84,88,90,91,92,96,97,102,109,135,136,…”

“…6 37,86 Lock and Dam No. 9 41,43,44 Lock No 2,15,21,22,55,57,68,77,80 piles 2,14,17,20,21,22,23,24,25,28,29,32,34,38,42,44,45,46,47,51,55,56,59,60,61,65,68,69,70,72,73,75,77,79,84,93,96,107,110,113,114,115,118,120,121,…”

“…Once the puddling settled, the leak stopped and additional puddling was added to replace that which had settled. 77 This pattern, a major leak beneath sheet piles not driven to rock, followed by settlement of the puddling into the resulting void, and topping off of the puddling within the cofferdam, repeated itself on several occasions. Turnbull eventually concluded that "it had now become very apparent that the whole mass of mud and sand underneath the puddling would be washed into the dam, and that, on its being replaced by the clay puddling, the dam would become tight."…”