Types of Cofferdams

A cofferdam is a structure that retains water and soil that allows the enclosed area to be pumped out and excavated dry. Cofferdams are commonly used for construction of bridge piers and other support structures built within water. Cofferdams walls are usually formed from sheet piles that are supported by walers and internal braces, and cross braces. Cofferdams are typically dismantled after permanent works are completed. Since cofferdams are usually constructed within water, the sheet piles are installed using preconstructed templates that permit the correct positioning of each sheet pile from a barge.

Types of Cofferdams

  1. Earth embankment
  2. Rockfill embankment
  3. Sandbag embankment
  4. Single wall timber sheet piling
  5. Double wall timber sheet piling
  6. Flexible sheeting on timber or steel framing
  7. Rock or earth fill timber cribs
  8. Single wall steel sheet piling
  9. Double wall steel sheet piling
  10. Cellular steel sheet piling
  11. Bored cast in place piling
  12. Precast concrete blockwork
  13. Precast Concrete frame unit
  14. Movable cofferdams (structural steel cylinders and shells)

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