| 摘要 |
PROBLEM TO BE SOLVED: To ensure a wide space by removing a center column. SOLUTION: Shield tunnels 10 and 12 are arranged adjacently so that tunnel axes mutually run parallel, and the tunnels 10 and 12 are connected directly through connecting sections 14. A ground beam 16 is installed to the upper sections of the connecting sections 14. A plurality of the ground beams 14 are mounted at regular intervals in the tunnel axial direction so that the tunnel axes of each shield tunnel 10 and 12 and a longitudinal axis are crossed at approximately right angles. A plurality of hanging anchors 24 are secured among the connecting sections 14 and the ground beams 16. In the hanging anchor 24, the lower end sides are anchored and fixed onto the connecting sections 14 while the upper end sides of the respective hanging anchors 24 are anchored and fixed onto the side walls of the ground beams 16.
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