Cefali& AssociatesContactPermanent tiebacks need room in the ground behind a retaining wall as well as a structural connection to it. At Hoag Hospital in Newport Beach, a nearby property line constrained the permanent anchors for a wall approximately 50 feet high.
Cefali & Associates designed the wall with 70 tiebacks and 47 soldier piles. The retaining system supported the site selected for the hospital’s central plant and cogeneration facility at the base of the campus hill.
Site conditions
At Hoag, the permanent tieback layout had to account for the nearby boundary. A wall line within a site does not establish the room available for anchors beyond it. Structural design and the available property rights remain separate considerations.
Tiebacks transfer lateral wall loads into the ground behind the retaining system. Hoag’s permanent wall design included a significant seismic load increment because of the nearby Newport-Inglewood fault, in addition to the other demands on the wall.
The design also accounted for groundwater and an existing methane gas well. Anchor geometry and capacity need to be developed with the site’s geotechnical criteria, adjacent facilities, and the support provided by the pile wall.
Published project work
Hoag Memorial Hospital: 70 tiebacks supported a permanent soldier pile retaining wall beside a constrained central plant site.
Engineering scope
These projects show how excavation depth, neighboring structures, access, and the permanent work can change the support design. Your site needs its own geotechnical criteria and structural design. The contractor determines installation and construction means and methods.
Read more about tieback shoring or explore other published work in Newport Beach.