Yesterday we completed our first of many dives assisting CJ Mahan with the demolition and removal of Lock and Dam Number 52 on the Ohio River.
The Ohio River’s system of lock and dams begins in Pittsburgh, PA at the confluence of the Allegheny and Monongahela rivers and ends at the confluence of the Ohio and Mississippi rivers near Cairo, IL, where more commerce traverses than any other location on the entire U.S. inland waterways.
Lock and Dam Number 52, completed in 1929, is located about 1.5 miles downstream of Brookport, IL (near Ballard County, KY) at mile 939 below Pittsburgh. The locks are located on the Illinois bank of the river. Twenty-three miles downstream is Lock and Dam Number 53, approximately 11 miles upstream of Cairo, IL. These older locks are frequently congested, sometimes taking as long at 15 to 20 hours each to transit.
The U.S. Army Corps of Engineers recently completed the Olmsted Lock and Dam that will replace lock and dams Number 52 and Number 53. It was the largest Corps project since the Panama Canal. It consists of two 110-foot by 1,200-foot locks adjacent to the Illinois bank and a dam comprised of five tainter gates to control the amount of water that flows downstream, 140 wickets, and a fixed weir on the Kentucky bank.
With the Olmsted Lock and Dam now operational, demolition of Lock and Dam Number 52 is underway. For the next year and more, Marine Solutions will provide underwater construction services assisting CJ Mahan with the demolition of Lock and Dam 52. These services will include underwater inspections, sediment removal, timber pile removal, steel sheet pile removal, removal of wicket gates and beartrap gates, and multi-beam bathymetric surveys.
American Electric Power (AEP) contracted Marine Solutions to provide a floating platform, steel repairs, high pressure cleaning and inspections to the Head Gate Roller track guides and intake structures. In order to provide these services, we assembled an 80’ x 60’ x 5’ tall barge platform to include a 40-ton crane, two decompression chambers and 5120 compressors, dive bell, LARS system for placing the bell in the water, mixed gas diving spread, and of course a LARGE assortment of tools and supplies required to complete the project. This is the first mixed gas project Marine Solutions has been awarded. The project includes performing dives up to 200 feet deep. When diving to depths for long periods of time over 150 deep, mixed gas is typically required. The term mixed gas is used to represent a breathing mixture of helium and oxygen or Heliox. The use of mixed gas or Heliox requires a lot of additional equipment, training, and experience. Our first mixed gas dive to 198 feet was completed on May 15th and all went as planned.
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This year we successfully completed the ADCI Diving Contractor Audit and demonstrated satisfactory compliance to the ADCI International Consensus Standards for Commercial Diving and Underwater Operations! This is a wonderful milestone for Marine Solutions and shows that we are a fully vetted contractor to perform underwater operations.
To hear more of how the auditing process is conducted, please click the button below.
We filmed a short underwater video of one of our divers installing some anchors during an ammonia line installation project. Check out behind the scenes footage!
As promised, here's a video of the Milton-Madison Bridge Slide. Incredible! (for more information on the project see our previous post)
Last year, MSI performed underwater construction and commercial diving services for the Milton-Madison Bridge. The bridge reopened earlier this week after the historic slide. Stay tuned for a video of this incredible feat.
For a full article: http://www.roadsbridges.com/bridge-construction-milton-madison-bridge-reopens?eid=216611660&bid=854830