PIN PILES + CAP BEAM

Chesapeake Bridge Bay Tunnel (CBBT)

SUMMARY

Cap Beam Structure:

Steel members for the platform floor beams:
W27x129.

Piles:

Diameter: 36”, Thickness: 5/8”
Length: 100 ft.

he CBBT Parallel Thimble Shoal Tunnel Project will construct a new twolane tunnel under Thimble Shoal Channel. When complete, the new tunnel will carry two lanes of traffic southbound and the existing tunnel will carry two lanes of traffic northbound.

As part of the CTJV Project and included within the temporary works needed on Portal Island 1, Chesapeake Tunnel Joint Venture (CTJV) asked AZIERTA for the design of the pin piles and cap beam template to be used in the construction of the IPP Wall and the Trestles.

The template structure is made of 4 piles that receive a cap beam structure that will serve as a template to precisely drive the permanent piles for the trestle structure. The calculations checked member sizes, connections and anchorages for the required elements of the design.

For the design of the steel profiles needed, the software used was FLAC3D from ITASCA CONSULTING GROUP (Minneapolis, Minneapolis), which allows the modeling of complex problems.