The Dune Palms Road Bridge Improvements Project aimed at enhancing the infrastructure and involved a meticulous scope of work.

The Project:

The installation included 60 24″ Cast-In-Drilled-Hole-Piles and 12 60″ Cast-In-Drilled-Hole-Piles, each with specific dimensions and quantities outlined under Caltrans Sections 49, 52, and 90. The arid terrain posed formidable challenges, featuring interbedded layers of loose to medium dense, cohesionless soils with gravel and low moisture contents—elements that proved particularly resistant during pile installation and raised concerns of potential anomalies. Notably, Foundation’s distinctive approach to this adversity shone through, involving the strategic use of temporary casings, synthetic slurry mixes, and efficient time management to construct Cast-In-Drilled-Hole piles free of anomalies. The Foundation team expertly navigated the difficult soil conditions and implemented innovative solutions to ensure the seamless success of the project.

  • 60 ea., 24” Cast-In-Drilled-Hole-Pile (Bid Item #61); 3,076LF Total (thus, 51.25LF each)
  • 12 ea., 60” Cast-In-Drilled-Hole-Pile (Bid Item #62); 1,284 LF Total (4 piles @ 103LF, 4 piles @ 110LF, and 4 piles @ 108LF).
  • As per Caltrans Sections:
    • 49 Piling
    • 52 Reinforcement
    • 90 Concrete

Challenges:

  • Difficult pile installation.  Presence of interbedded layers of loose to medium dense, cohensionless soils with gravel and low moisture contents.
  • Soils susceptible to caving that could result in shaft construction difficulties and/or anomalies.
  • Selection of appropriate means and methods to prevent any anomalies while constructing these CIDH piles.
  • Extra long rebar cages sticking out of the ground.

The Solution:

  • Foundation prevented soil caving and constructed CIDH piles free of anomalies by:
    • Installaing and withdrawing temporary casings without compromising the integrity of the CIDH piles,
    • Using appropriate synthetic slurry mixes suitable for the job conditions, and by
    • Reducing the amount of time the CIDH drilled holes were kept open and/or unfilled with reinforcement and concrete.
  • Proper surveying and adequate bracing in order to maintain rebar alignment and correct elevation during concrete pouring and during curing.