1,034,465. Tunnelling shields. M. F. KEMPER. July 4, 1963 [May 23, 1963], No. 26494/63. Heading E1F. An arched tunnelling shield S having beams 17 is supported by individually movable jacks 15, 16, each beam being supported by at least two jacks. The jacks are each pivoted at 22 to a carriage 20 movable on the beam, the leading jack on each beam being connected by ties D to the following lining B. The shield is shown in Fig. 2 after being advanced one step by rams 7, 8 engaging the lining, the jack shown dotted being in the position of the leading jack prior to the next advance step of the shield. The lining comprises steel I beams 9 and lagging strips 10, the beams being jacked up against the wall of the tunnel and supported on blocks 12.