Robert Stier
Robert started his career in construction over 40 years ago, eventually joining Drill Tech in 2018. As an Area Manager, he has been responsible for developing Drill Tech’s startup operations in the Mid-Atlantic Region for Tunnel and Foundation Construction. Mr. Stier possesses an impressive record of tunneling experience through a wide range of geological conditions while utilizing various methods of excavation. TBM, NATM, drill/blast, and roadheader are among the list of techniques he has mastered over the years. Mr. Stier oversees Drill Tech's projects within his region and contributes to the overall tunneling operations and pursuits.
- 41 Tunneling Projects Successfully Completed throughout career
- $1B+ Contract Value of Tunneling Projects throughout career
- 300,000+ LF of Tunnel Excavation throughout career
- OSHA 30 hour Certified, Rail Safe Certified
Robert's Featured Projects
AWB Beaver Creek Clean River Tunnel | Albany, NY
Project Manager
Drill Tech excavated a 9.5' horseshoe x 540' long tunnel utilizing an AM50 roadheader and installed a 60' long x 55' wide x 50' deep elliptical shaft around a large live sewer utilizing sequential excavation methods. Sinkholes were encountered around the shaft, so micropiles were installed for stabilization. Drill Tech designed and installed a 3,000 SF soldier pile and wood lagging retaining wall and installed draped mesh for protection from potential rockfall.
Northside Interceptor Tunnel | Akron, OH
Area Manager
Drill Tech performed roadheader tunnel excavation and temporary support of three new tunnels totaling 860 LF. Excavated dimensions of the tunnels were 23.5' high by 22.5' wide (horseshoe). The temporary shaft and tunnel support consisted of rock dowels, welded wire fabric, shotcrete, and steel straps.
FCWA Occoquan River Crossing Tunnel | Lorton, VA
Area Manager
Drill Tech performed drill/blast excavation and temporary support of a new vertical shaft at 24' diameter x 98' deep and a new tunnel at 12' wide x 10' tall x 420' long. The temporary shaft and tunnel support consisted of resin rock bolts, welded wire fabric, and steel straps. Two additional 7' diameter shafts were excavated to a depth of 90' below grade using raise bore methods. Lastly, twin runs of 42" diameter steel water main pipes were installed in the tunnel.
Milestone Reservoir and Pump Station | Ashburn, VA
Area Manager
This project consists of the drill/blast excavation of a new 30' diameter and 275' deep vertical shaft and three new tunnels totaling 2,400 LF in length. Drill Tech utilized various initial and final support systems for both the shaft and tunnels, including shotcrete, resin rock bolts, and reinforced concrete. This project also includes construction of a new vertical shaft using raise bore methods and installing a 42" and 36" diameter steel water pipe in the shaft and tunnels.
