| 摘要 |
Perfect support lining is obtained made from concrete supplied in situ during the progress of the front formwork endowed with a hollow section 8 which frontally closes off the annular space between the interior tubular formwork 1 and the ground 3. This hollow section 8 filled with a fluid is located between two tracking lips 6, 7 and includes radial webs 9 which separate it into segments 10 constituting independent chambers. Each segment is connected to an individually adjustable pressurised-gas accumulator 11. These accumulators 11 are connected up to a control device with the aid of which neighbouring hollow segments receive different modulated pressures. The concrete inlet 13 is located at the upper portion in a radial web 9. Public works, civil engineering, construction of tunnels. <IMAGE>
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