| 摘要 |
PURPOSE:To effectively construct an underground space regardless of the presence of existing structures by a method in which a pilot tunnel is excavated connectedly to an entrance tunnel from the ground's surface, an underground wall is constructed in the ground, and the inside of the wall is excavated. CONSTITUTION:An entrance port is set in a place securing a space on the ground's surface of park B, etc., and an entrance tunnel consisting of vertical pits 1, oblique pits, and horizontal pits 2 is excavated. Pilot tunnels 3 to be connected to the entrance tunnel are then excavated. The peripheral edge of a cavity corresponding to the underground space area to be constructed above and below the tunnels 3 is excavated by shield construction method, etc., to construct underground walls 4. The inside C of the walls 4 is excavated to form an underground space. |
