Device for expanding tunnel from old lighting space limited by old tunnel roof to new lighting space in demolishing area, comprises protection unit with multiple protecting plates for protecting demolishing old tunnel roof from breaking

摘要

The device comprises a protection unit for protecting the demolishing old tunnel roof (19) from breaking. The protection unit has multiple protecting plates (12,13) placed at a distance from a demolishing area (29) and movable in an axial direction. The old tunnel roof is protected by the protecting plates. The outer protecting plates are movable in axial direction and the inner protecting plates are movable in the axial direction. The outer protecting plates are arranged in an outer protection profile lying in the new lighting space (31) outside the old lighting space (30). An independent claim is included for a method for expanding a tunnel from an old lighting space limited by an old tunnel roof to a new lighting space with a tunnel expanding device.