Marco Island Marriott Lanai Project successfully completed

Massachusetts Mutual Life Insurance Company, owner of the Marco Island Marriott, contracted Austin/Gilbane JV as the main contractor to build a hotel expansion of approximately 595,000 gross ft² (55,277 m²) in Marco Island, Florida. The installation of the support of excavation and piling was awarded to BAUER Foundation Corp. (BFC). For the design of the support of excavation, BAUER Foundation Corp. evaluated multiple construction options, including sheet piles, secant pile wall, and Cutter-Soil-Mixing (CSM) wall. It was determined that the most economical and efficient option was to construct a CSM retaining wall with tie-backs. The design was based on the need to support a maximum cut along the wall of 12 ft (4 m) below existing grade in most areas. The support of excavation system was designed to allow for the mass excavation and dewatering required for the installation of the complete foundation system.

The work was completed using Bauer machines, a BG 28 for the installation of CSM wall panels and a KLEMM KR 806-2 for the tie-back anchors. The piling consisted of 16 inch (406 mm) diameter auger cast-in-place piles (CFA) installed approximately 71 ft (22 m) below existing grade. The pile design was confirmed with a single static compression load test and a single static tension test as required by the geotechnical report and specifications. Two BG 28 rigs were used to install the piles.