Marine USCOE Soo Cofferdams > Projects > USACE Cofferdams, Sault Ste. Marie, MI PREPARING FOR THE NEW SOO LOCK The USCOE 鈥� Detroit District & Sault Saint Marie City Area Office constructed 2 – 90 ft diameter cofferdams in preparation of the new lock project.聽聽 INSIDE THE PROJECT The 2 cofferdams were designed to allow the Sabin Lock to be dewatered and for demolition of that lock to begin.聽 To construct the cells, we designed, fabricated, and install a 89 ft diameter double row template to assist with our construction.聽 The template allowed for the sheets to be on the outside because it was to fit tightly between the north and south lock faces.聽 At each tangent pint against the locks, a concrete seal pour was installed to prevent water from bypassing the structure.聽聽 A large crane with extra boom was used to install the 172 sheets, which made up each cell.聽 Each sheet was set and threaded to its adjacent sheet creating an enclosed cell.聽 When all the sheets were installed and tamped to top of rock, the cell was backfilled with clean stone.聽 After filling and finishing the first cell, the template was removed and reused for the second cell.聽聽 Upon completion of both cells, a drilling subcontractor was employed to install a series of piezometers inside each cell.聽聽 In the course of the contract there were several changes of conditions.聽 The largest was an existing concrete sill not shown on the drawings, which required demolition prior to constructing the westerly cell.聽聽 WHY IT MATTERS The cofferdams were the first step toward construction of the new 鈥淪uper Lock鈥�, which will be the same size as the existing Poe Lock.聽聽 BEYOND THE PROJECT The construction of the new 鈥淪uper Lock鈥� will be vital infrastructure for the shipping industry for decades to come. PROJECT DETAILS: Project Name: USCOE Soo Cofferdams P7120391 PB030182 PC070201 ssm 1 ssm 2 ssm 3 ssm 5 Close P7120391 PB030182 PC070201 ssm 1 ssm 2 ssm 3 ssm 5
PREPARING FOR THE NEW SOO LOCK The USCOE 鈥� Detroit District & Sault Saint Marie City Area Office constructed 2 – 90 ft diameter cofferdams in preparation of the new lock project.聽聽 INSIDE THE PROJECT The 2 cofferdams were designed to allow the Sabin Lock to be dewatered and for demolition of that lock to begin.聽 To construct the cells, we designed, fabricated, and install a 89 ft diameter double row template to assist with our construction.聽 The template allowed for the sheets to be on the outside because it was to fit tightly between the north and south lock faces.聽 At each tangent pint against the locks, a concrete seal pour was installed to prevent water from bypassing the structure.聽聽 A large crane with extra boom was used to install the 172 sheets, which made up each cell.聽 Each sheet was set and threaded to its adjacent sheet creating an enclosed cell.聽 When all the sheets were installed and tamped to top of rock, the cell was backfilled with clean stone.聽 After filling and finishing the first cell, the template was removed and reused for the second cell.聽聽 Upon completion of both cells, a drilling subcontractor was employed to install a series of piezometers inside each cell.聽聽 In the course of the contract there were several changes of conditions.聽 The largest was an existing concrete sill not shown on the drawings, which required demolition prior to constructing the westerly cell.聽聽 WHY IT MATTERS The cofferdams were the first step toward construction of the new 鈥淪uper Lock鈥�, which will be the same size as the existing Poe Lock.聽聽 BEYOND THE PROJECT The construction of the new 鈥淪uper Lock鈥� will be vital infrastructure for the shipping industry for decades to come. PROJECT DETAILS: Project Name: USCOE Soo Cofferdams P7120391 PB030182 PC070201 ssm 1 ssm 2 ssm 3 ssm 5 Close P7120391 PB030182 PC070201 ssm 1 ssm 2 ssm 3 ssm 5