Abstract: Apparatus for use in tunnel driving employs a drive shield of known type with elongate drive members arranged side-by-side and supported and guided by a rigid frame. Hydraulic rams are used to alternately advance individual members or groups of members and the frame. Fluid concrete is introduced behind the shield to form a permanent lining supported by formwork and sealed to the tunnel wall by sheet material. The fluid concrete is contacted during its setting period by a hollow ring member of the formwork. The ring member is provided with a filter structure permitting water to be withdrawn by suction. Further separate hydraulic rams interconnect the ring member and the frame of the drive shield enabling the fluid concrete to be compressed. Some of the drive members have prolonged thin rear extensions which form tails extending partly around the concreting zone in contact with the tunnel wall.