6th & Bixel, including Libertie and The Mint at the corner of 6th and Bixel in Downtown Los Angeles, is a Holland Partner Group project designed by Togawa Smith Martin. Englekirk Structural Engineers designed the building structure; Cefali & Associates designed the temporary excavation shoring.
The garage excavation ranged from 18 to 47 feet below grade with two to four parking levels. One to three rows of tiebacks braced soldier piles installed by Malcolm Drilling.
Two sides of the Bixel House property were supported at the deepest location of the project where tiebacks were coordinated beneath the property in orthogonal directions.
After the planned excavation bottom was reached, petroleum-affected soils required deeper excavation. Geotechnologies performed additional borings to establish the revised depth. The original soldier piles were retained and supplemented with additional tiebacks and walers so the deeper removal could proceed without adding pile foundations.
A deeper cut changes the height of ground retained by the installed shoring. The added tiebacks and walers became part of the support for that revised excavation. See our temporary shoring design and engineering for changed conditions.
