Traylor Bros (TBM Grout Plant)



Traylor Brothers Inc.
San Vicente Water Tunnel
San Diego, CA, USA

12 m3/hour per plant


  • Conceptual Design
  • Structural/Mechanical Engineering
  • Fabrication of all Equipment
  • Commissioning, Training & Site-Support 


  • SD1000 Colloidal Mixer c/w 2 colloidal mills
  • 2000 liter Agitation Tank
  • Admixture & Sodium Silicate Dispenser
  • Horizontal Gravimetric Feed Bins
  • Feed Screws & Dust Collection System
  • Automated PLC/MCC Controls
  • Batch Data Collection
  • Water & Pneumatic Systems
  • High Pressure Peristaltic Pumps

As part of the 17.7km San Vicente water pipeline project in San Diego, Traylor Brothers Inc. required two automated grouting systems for back-grouting of the concrete segmental lining behind a 3.5m diameter TBM.

Team was assigned the task of designing, fabricating and commissioning two separate automated slurry plants which combine cement, flyash, bentonite and water along with a retarding admix in a high shear colloidal mixer. Batches are held in an agitation tank until pumped underground to a holding tank within the TBM.

A dispenser and peristaltic pump system are also used to feed a sodium silicate solution to the TBM.

Horizontal silos, requiring no vertical erection by crane, were a stipulation on this project. Cement is contained in one whereas the second is split to contain both flyash and bentonite, which then sits directly atop the colloidal mixer and agitank.