The Dr. Sauer Group is your partner for cost effective and innovative tunnel design. Special expertise is available for the design of new tunnel and station structures, waterproofing of underground structures, and rehabilitation of existing tunnels and other underground structures. Construction methods include:

• Mined Tunneling Methods (e.g. NATM, SEM, Shotcrete Method, SES),
• Mechanized Tunneling Methods (e.g. TBM, EPBM, Shield Tunneling), and
• Open Cut Methods (e.g. Cut-and-Cover, Top-Down).

Based on the worldwide experience and involvement in numerous tunneling projects since 1980 the Dr. Sauer Group can refer to an unmatched pool of case histories and successful projects for transit tunnels and underground stations, highway and utility tunnels as well as pedestrian tunnels. Tunnels can be located in rural or urban areas and any type of geology, including soft ground, mixed face and hard rock.

Design services include:

• Feasibility and other Technical Studies 
• Comparative Studies: comparing Mined / Mechanized / Cut-and-Cover Tunneling Methods
• Conceptual and Preliminary Design 
• Final Design and Bid Support Services
• Conceptual and Detailed Cost Estimates
• Risk Management
• Value Engineering
• Design-build Design Services
• Construction Support Services (e.g. Value Engineering Proposals and Shop Drawings)
• Insurance Support Services
• Claim Management
• Expert Advice
• Waterproofing Design
• Tunnel Ventilation and Emergency Evacuation Design.

Special Construction Methods:

A series of special construction methods have been developed to address special conditions for tunneling: 

• Doorframe Slab Method: for tunnels with shallow overburden
• Barrel Vault Method: for tunnels in soft, loose ground
• Caisson Method: for mined tunnels under water, e.g. river crossings
• Drainage Rehabilitation System: to effectively control water seepage and prevent deterioration of tunnel and underground structures
• Waterproofing System (membrane type with sectioning for remedial repair) for all underground structures