Two Miles of Anchored Bulkhead Supports Howard Frankland Bridge Megaproject-PPT Presentation

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The Howard Frankland Bridge project in Tampa Bay, Florida, includes a new bridge supporting eight lanes and a bicycle path, followed by demolition and traffic rerouting on the existing bridges. Keller’s design-build work involved installing roughly two miles of anchored bulkhead on the Pinellas and Hillsborough sides.<br /><br />Over 14 months, two drilling crews installed 1,251 anchors: 943 for sheet-pile walls and 308 for combi-walls. The work required 25 miles of drilling and 135 miles of strand. Sheet-pile anchors connected to continuous W21 walers, while combi-wall anchors used individual built-up W24 walers and connections to W40 combi-piles.<br /><br />Installation was complicated by tidal conditions, weather, work from excavators and barges, and the need to accommodate protected American oystercatchers. Engineering challenges included complex geometry, adjacent construction that required skewed anchors, and highly variable soil and limestone profiles. Limestone depth varied by as much as 60 feet on the Pinellas side and 20 feet on the Hillsborough side.<br /><br />The construction sequence was to install the sheet piles and combi-walls, install the anchors, then carry out earthworks and build retained embankments up to 20 feet tall at the bridge abutments. Extensive quality testing included 1,058 proof tests, 128 performance tests, and 65 creep tests. Engineers also assessed settlement-induced anchor loading by estimating soil settlement along each anchor and calculating the resulting elongation and load.

Keywords

Howard Frankland Bridge

Tampa Bay

Florida

anchored bulkhead

sheet-pile walls

combi-walls

bridge construction

anchor installation

geotechnical engineering

traffic rerouting