| 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 a connecting section 14. The connecting section 14 has an upper slab section 14a and a lower slab section 14b arranged in parallel in the vertical direction. A ground beam 16 is installed in a ground just above the connecting section 14. The ground beam 16 has a departure section 18, an arrival section 20 and an arch section 22. In the arch section 22, the axes of the tunnels 10 and 12 and longitudinal axis are extended in the same direction, and a central section is bulged and curved upwards. A plurality of hanging anchors 24 are mounted between the connecting section 14 and the ground beam 16. In the hanging anchors 24, the lower end sides are anchored and fixed onto the connecting section 14 while the upper end sides of the respective hanging anchors 24 are anchored and fixed onto the arch section 22.
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