Explain Techniques To Install Piling Systems And Ground Stabilization Activities

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The Great American Pyramid, as it was once called when first constructed in 1991, was built as a basketball arena and exhibit space by the city of Memphis in order to attract an NBA franchise. (see photo Pyramid at Night) Ironically, when Memphis recruited the Vancouver Grizzlies in the Mid-2000’s, one of the demands of the Grizzlies ownership was that Memphis would need to build a brand new arena in order for the Grizzlies to move.

The building of the new FedEx Forum, current home of the Memphis Grizzlies NBA team, meant that the Pyramid would become obsolete unless it could find a buyer. Bass Pro Shops, after a long period of due diligence, agreed to purchase the Pyramid, with conditions.

The Pyramid was constructed prior to IBC 2007 seismic codes which meant that the City would have to retrofit the entire structure to accommodate a new retail facility. This POY submission by Chris-Hill Construction Company, Pyramid Package #2, is the below ground seismic construction package that ensured the Pyramid would not move laterally during an earthquake or fail due to instability of the adjacent Mississippi River bank.(see attached Pyramid Rendering) The following are details describing WHY this project deserves to become an I Build America Project winner. This project provided 20 jobs for construction trades for 6 months. This may not seem like much but it is a big deal to each worker.

Providing jobs to our 70 employees is the main reason we do construction. Yes it can be satisfying, yes it can be difficult but the greatest satisfaction is putting good men and women to work every day and paying these folks every week (via HeavyJob/ACH direct deposit, we might add).Keeping people employed with good paying, mind stimulating, sweat producing jobs is the greatest asset to American freedom imaginable, and we have been privileged enough to do this for the last 51 years. Once our design settled on the combi-wall, shear fin arrangement we had to determine what type of piling equipment would be best for installation. (See Drawings –Blowup of Shear Fins-Plan View) Each shear fin is comprised of a 14×73 H-Pile connected to a pair of AZ19-700 connected to a middle HP14x73 connected to another AZ19-700 connected to a final HP14x73. H-Piles were fitted with continuous C9 female interlocks.(see Section View C9/E22 Connectors) The outside H-Piles had one continuously welded C9 whereas the middle H-Pile had a C9 on each side.

C9 interlocks were welded to 70’ long H-Piles in Skyline Steel’s fabrication shop in Blytheville, AR, across the street from the Nucor Steel Mill. AZ19-700 sheeting was rolled in Belgium, shipped to Savannah and trucked to Memphis. Typically, C9 connectors are welded to two sides of an H-Pile when fabricating combination walls. Welding to opposite flanges of a 70’ long H-Pile somewhat equalizes thermal bending stresses imparted due to continuous welding.

All outside H-Piles had only one E22 connector continuously welded to one side which meant the piles bowed 8” to 12” after welding. The piles looked like 70’ long, steel bananas.

Fortunately, Skyline had a custom made press built specifically for these types of problems. 2 to 3 cycles through the press dropped tolerances down to 1” to 2” of bow. Most piles also developed axial twist due to the heat related eccentricities developed during welding which was simply a problem we had to overcome during driving. Initially, our team agonized over the type of template we would construct to keep the combi-walls from racking and insure plumbness. Fortunately each shear fin panel was only 13’ long which meant that if the pieces did begin to rack out of plumb, the problem was not cumulative.