Barnard (TBM Grout Plant)



Barnard Impregilo Healy JV
Third Street Light Rail Project
San Francisco, CA

24 m3/hr



  • Conceptual Design
  • Mechanical Engineering
  • Fabrication of all Equipment
  • Commissioning
  • On-Site Training and Site Support


  • Tornado 1200 Colloidal Mixer
  • 20’ Heated Container
  • 3000 litre Agitation Tank
  • Three 70 m3 Capacity Horizontal Silos
  • Three Screw Conveyors
  • Automated PLC/MCC Control System
  • Pneumatic System
  • Admix System
  • Water Weigh Hopper
  • Two 65 mm Peristaltic Grout Pumps
  • Two 50 mm Peristaltic Accelerator Pumps
  • 3000 litre Bentonite Tank & Pumps

During the first half of last century, streetcars traveled up and down “Three Street,” shuttling riders between downtown and points along the Bayshore Corridor. Now, decades later, Muni, the City of San Francisco, and the San Francisco Metropolitan Transportation Authority (SFMTA) have launched the Third Street Light Rail Project to reestablish rail service along this corridor. The Central Subway Project is the second phase of this project and will extend the T Third Line from the 4th Street Caltrain Station to Chinatown, a distance of 1.7 miles.

Team Mixing Technologies Inc. was awarded the contract for a 24 m3/hr capacity bi-component (A/B type) grout plant to feed the two Robbins TBM’s. Subsequent contract additions included the supply of a hydrated bentonite storage/pumping system as well as a sodium silicate dilution/pumping system.

The project site is located under the Dwight D. Eisenhower Hwy approach to the Bay Bridge. The limited clearance required the design of low profile bins to contain cement, flyash and bentonite.