Shield Tunneling - Akkerman

Shield Tunneling

Shield Tunneling

Excavator shield tunneling is a trenchless method used for larger diameter utility and crossing tunnels. This specialized form of tunneling includes a steerable forward shield with a hood that extends beyond the excavating face for ground stabilization. The material at the face is excavated by a digger arm that is controlled by an operator inside the shield. As the pipe string advances in the pipe jacking mode or propelled by a jacking can in a ring building mode, the leading edge of the shield scarifies the ground while the excavator’s arm moves material onto the conveyor belt for removal. A hydraulically controlled steering joint allows the onboard operator to make line and grade adjustments when dictated by the tunnel laser mounted in the launch shaft.

Case Studies

Case Study: Pipe Jacking & Utility Tunneling

The following article was recently published in the 2022 annual Texas & Oklahoma Trenchless Report. Project Overview The project involved the construction of a 36-inch diameter HDPE water line inside of a 48-inch diameter casing, that ran under highway I-20 and a Union Pacific Railroad near Stanton, TX. While using their 48SCII TBM with standard […]

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