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2015SummerShotcreteEMag

Sustainability Need to Get a Project Completed Efficiently? Employ Shotcrete! By Ray Schallom III and Randle Emmrich T more, MD, began in 2006. The hotel is significant delays in work leading up to the-Corporation for the Baltimore Hilton Convention Center Hotel. The project experienced-he foundation work for the BaltimoreHilton Convention Center Hotel, Balti located across the street from the Oriole Park at foundation wall placement that triggered a Camden Yards baseball stadium and a couple of search for time-saving construction alternatives blocks south of the busy Inner Harbor area. The to the original construction plan. The wet-mix developers were the Baltimore Development shotcrete process was chosen over cast-in-place, and the resultant one-sided form method saved both schedule time and money. The backside of the wall consisted of drilled I-beams with soil nail anchors and wood lag- ging placed between the beams to restrain the loose earth behind the wall. Deep-drilled rein- forced piles were located every 20 ft (6 m) along the perimeter of the new foundation wall and under each column area in the bottom floor of the excavation. The pile drilling operation had many delays, which pushed the scheduled start for all other work back by several months. The delays leading up to the foundation wall installation included the wall waterproofing, pipe and duct work blockouts, and reinforcing bar installation. Before this project, all building foundations in Baltimore had been formed and cast with concrete. The original drawings called for two-sided, conventional cast-in-place con- crete formwork. Hensel Phelps Construction Company, the general contractor, familiar with the wet-mix shotcrete process from their West Coast projects, proposed shotcrete to the owner and design team as a viable solution to recoup the lost time in the schedule. It took some con- vincing before the developer and design team agreed to use the shotcrete process over cast-in- place concrete. However, once the use of shot- crete was approved, bids were sent out to several shotcrete contractors. Coastal Gunite Construc- tion Company (Coastal) was chosen for the project. The construction team then initiated the submittal process. Having no one on the design team with wet-mix shotcrete foundation experi- Fig. 1: Lagging and steel I-beam piles with soil anchors. Waterproofing ence made approving submittals a challenge for installers and reinforcing bar crew working just ahead of the shotcrete crew Coastal and Hensel Phelps. 36 Shotcrete • Summer 2015


2015SummerShotcreteEMag
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