Shield for open excavation work in soil - moves hydraulically and can rotate in vertical plane by using mechanisms pivoted to rigid side walls

摘要

The shield for open excavation work in soil has a housing (1) built as a closed frame with hydraulic jacks (2) for moving the shield. Side walls (3) are rigidly connected to the housing. The length of the bottom part of the housing is less than the length of the shield. An arrangement for rotating the shield in a vertical plane is pivoted to each side wall.