Geotechnical Solutions for Tunnel Shaft Projects Nationwide
From deep shafts to groundwater control, Schnabel provides innovative and safe geotechnical solutions for complex tunnel and shaft construction projects.
Innovative Tunnel and Shaft Solutions
Cut-and-Cover Tunnels
Ramps
Access Shafts
Underground Structures
Specialized Ground Improvement and Shaft Construction
Schnabel is known for its versatility and innovative approach to ground improvement, and tunnel and shaft construction. We use advanced techniques, including:
Schnabel’s approach minimizes the risks and costs associated with traditional shaft excavation and ensures that projects are completed safely and on schedule.
Why Schnabel?
With over 65 years of expertise, Schnabel is trusted by clients to solve complex geotechnical challenges in tunnel and shaft construction. Our design-build capabilities and commitment to safety, reliability, and efficiency make us a go-to partner for underground infrastructure projects.
Let Schnabel help you navigate the complexities of your tunnel and shaft project.
We provide tailored solutions that ensure success from the ground up.
Real-World Results in Tunnel and Shaft Projects
Proven Expertise in Underground Construction
Schnabel’s team has worked on some of the most demanding tunnel and shaft projects in the U.S., providing innovative solutions that ensure stability, safety, and efficiency.
San Marcos River ARWA Tunnel Shafts
Location:
Martindale, Texas
Client:
SJ Louis Construction
Background
Two circular access shafts were required for a water supply tunnel project along the San Marcos River. The shafts needed to provide safe and stable access for tunnel construction while navigating variable subsurface conditions and ensuring minimal disturbance to surrounding areas.
Schnabel’s Solution
Schnabel designed and constructed the shafts using overlapping secant piles filled with unreinforced concrete—42 piles to 69 ft for the launching shaft and 24 piles to 58 ft for the receiving shaft. Specialized Bauer drill rigs with 1180 mm casing ensured precise alignment and verticality, providing stable excavation support for tunnel construction.
Results
The secant pile shafts provided stable, safe access for tunnel construction and maintained structural integrity throughout excavation. Schnabel’s efficient installation minimized subsurface disturbance and ensured the project remained on schedule.
Romeo Arm Interceptor
Location:
Sterling Heights, MI
Client:
Oscar Renda
Background
The Romeo Arm Interceptor project required the repair and stabilization of a deep sewer system. Oscar Renda contracted Schnabel to provide a secure shaft for tunnel access and excavation support to safely complete the repair work.
Schnabel’s Solution
Schnabel installed a 34.5-foot inside diameter secant pile shaft consisting of 60 overlapping secant piles ranging from 8 to 51 feet deep. Shallow piles followed the top radius of the tunnel, while deeper primary and secondary piles (38 ft and 51 ft) ensured basal stability. W21x182 wide flange steel sections were placed in secondary shafts for reinforcement.
Results
The secant pile shaft provided a stable, reinforced excavation for the deep sewer repair. Schnabel’s precise installation and reinforcement allowed the project to proceed safely and efficiently, supporting the structural integrity of the repaired sewer system.