Casey Key Steel Sheetpile Seawall

Summary: Erickson Consulting Engineers, Inc. (ECE) was responsible for managing all design, permitting, engineering and construction for a 500-ft vertical oceanfront steel sheetpile wall to protect storm-threatened upland properties.

Construction Cost: $1.2M

Aerial of Project

Unique Construction Methodology:

Hydraulic Press-in System

 
Key Project Elements:

  • Seawall Design
  • Frangibility Analysis
  • Analysis of Adjacent Coastal Structures
  • Storm Erosion Computer Modeling
  • Linear Regression Analysis
  • Geotechnical and Structural Analysis
  • Topographic and Bathymetric Surveys
  • Acquire all County, State and Federal Permits
  • Re-vegetation Plans and Design Using Native Plants
  • Environmental Resource Mapping
  • Sea Turtle Monitoring Plan
  • Development of Lateral Access and Conservation Easements
  • Assessment of Existing Utilities and Relocation
  • Drainage System Analysis and Re-Design
  • Construction Plans and Specifications
  • Bidding Assistance
  • Construction Monitoring Services
Shoreline data was obtained and storm erosion model simulations were performed to assess a 15 and 25-year return period storm event beach/dune erosion. A 500-ft cantilevered steel sheet pile wall was designed based on storm erosion data, geotechnical investigation of upland soils and scour analysis. Environmental studies and comprehensive planning included assessment and design of a dune re-vegetation plan to comply with state regulatory permit requirements.

Challenges: Due to very limited site access and the close proximity of residential structures to the seawall, a hydraulic press-in system was used to install the 40 ft steel sheet piles. The system “walks” on top of the sheet pile wall with a minimal required 7 ft wide work area and with minimal vibration. In addition, the project required that an existing utility watermain be passed-through a section of the seawall.

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