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.

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Digging Deeper – December 2021

Holiday Season is Here During the holiday season, our thoughts turn gratefully to those who have made our success possible. It is in this spirit that we say thank you and send best wishes for the holidays and New Year. Please note that Akkerman will be closed December 24th and reopen December 27th. We will […]

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Tunneling