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

Digging Deeper – August 2022

Tunnel Boring Machine Cutter Head Selection – A Manufacturer’s Perspective A tunneling project consists of numerous intertwined puzzle pieces. Often, the cutter head on the tunnel boring machine is the most critical. It is the front line to progress. Without a properly designed cutter head, production can be slow or nonexistent. The cutter head design […]

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