Metro Los Angeles, Westside Extension
subway extension Purple Line, phase 1
Client
Los Angeles County Metropolitan Transit Authority
California
USA
Contractor
Skanska-Traylor-Shea Joint Venture
Consultant for SEM/NATM: Beton- und Monierbau USA, Inc.
(100 % subsidiary of BeMo Tunnelling GmbH, Austria)
1 SEM/ NATM Superintendent on site for approx. 14 months
Project location
Willshire Boulevard
Los Angeles
USA
Start of construction
2019
End of construction
2020
Project total value
0.4 million €
Geology
Fernando and San Padro formation, tar impacted sands
Technical Data
Know-how-Transfer Project of the New Austrian Tunnelling Method (NATM) at the Purple Line subway extension project in Los Angeles (westside extension underneath Wilshire Boulevard).
The order includes constructional consultancy for the excavation of cross-passages between two TBM-driven tubes.
In the years 2016 and 2017 BeMo has already provided:
• Design reviews
• Equipment studies
• SEM/ NATM - technical feasibility studies
Technical details:
• Support during excavation of 23 cross passages in very difficult ground conditions
• ground improvement measures: jet grouting, dewatering, possibly freezing
Further project related information
• Site in urban, densely populated environment