Tunnelbaumaschine und Tunnelbauverfahren

摘要

1,070,772. Tunnelling machines. JAMES S. ROBBINS & ASSOCIATES Inc. May 11, 1964 [May 31, 1963], No. 19443/64. Heading E1F. A shield type tunnelling machine is so constructed that the machine spaces extending forwards from the heavy line PB can be maintained at an air pressure higher than existing in the tunnel to the rear of the machine, which is provided with air seals about the periphery of the shield S, an air tight bulkhead CS extending across the shield, enclosed conveyer means 32, 36 for conveying mined mineral rearwards through the bulkhead to hopper means 42, H 1 , H 2 provided with air locks 56, 58. Pressurized air is supplid to front of the machine through either pipe 70 or pipe 72.