| 摘要 |
PROBLEM TO BE SOLVED: To propose an underground space construction method for constructing an underground space including a main line tunnel without interfering with the main line tunnel.SOLUTION: In an underground space construction method, a plurality of small cross section tunnels along the axial direction of a main line tunnel T1 are juxtaposed before or after construction of the main line tunnel T1, and a region enclosed by the plurality of small cross section tunnels is excavated in a state that the main line tunnel T1 is included in the region to form a large cross section space 1. The underground space construction method includes: a forward excavation step of making an excavator for small cross section tunnel excavate from a base end 12 toward a tip end 11 of the large cross section space 1; a tip end excavation step of making the excavator carry out U-turn in underground of the outside of the cross section of the main line tunnel T1 on the tip end 11 side of the large cross section space 1; and a return path excavation step of making the excavator excavate from the tip end 11 toward the base end 12. |
