| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a limitation to the installation positions of converging and branching parts. SOLUTION: First and second shield tunnels 10 and 12 are constructed as a tunnel by annularly assembling segments 14 and 16. When a converging part is formed, the tunnels 10 and 12 are disposed parallel with each other and apart a specified distance from each other. A connection part 22 allowing the tunnels 10 and 12 to communicate with each other is formed between the tunnels 10 and 12 after parts of the opposed segments 14 and 16 are removed to form opening parts 18 and 20 and the outside natural grounds of the opening parts 18 and 20 are excavated. The connection part 22 is extended in the axial direction of the tunnel and comprises an upper plate 24 and a bottom plate 26. The upper and bottom plates 24 and 26 are locked at their both ends to the end edges of the opening ends 18 and 20 of the segments 14 and 16 apart a specified distance in the vertical direction. A PC steel wires 28 is installed between the tunnels 10 and 12 and the connection part 22 so as to wrap around them in a continuous state, and fixed in a tensed state. COPYRIGHT: (C)2005,JPO&NCIPI
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