| 摘要 |
<p>1,213,046. Lining tunnels. -GOSUDARSTVENNY ORDENA TRUDOVOGO KRASNOGO ZNAMENI PROEKTNO-IZYSKATELSKY "METROGIPROTRANS". 7 Feb., 1968 [8 Feb., 1967], No. 5979/68. Heading E1F. In a process for lining a tunnel using concrete mix inserted around a tunnel shell 7, the mix is subjected to a first compaction by jacks 5 as tunnel shield 1 and cutting head 2 advances, and to a second (higher) compaction by the jacks after the cutting action of the head has been halted.</p> |
