Metro Los Angeles, Westside Extension
subway extension Purple Line, phase 1
Los Angeles County Metropolitan Transit Authority
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
Start of construction
End of construction
Project total value
0.4 million €
Fernando and San Padro formation, tar impacted sands
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
• 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