The general contractor was required to design and install the temporary support of excavation for the cut and cover tunnel. A temporary support of excavation comprising soldier piles and lagging, in addition to secant pile wall along the existing Episcopal House and the existing parking garage, was selected.
The secant pile walls were designed by Mueser Rutledge Consulting Engineers. Soldier piles, W24 x 117, were installed in all secondary piles immediately after concreting.
Prior to the secant pile wall construction, TREVIICOS installed concrete guidewalls. The purpose of the guidewalls are to provide permanent alignment, guide for the drilling tool at the surface and support the upper portion of soil immediately adjacent to the excavation.
38 Third Avenue, Charlestown, MA 02129 U.S.A.