Precast structure, and construction method for underground structures

(10) WO 2017/081990 Al

(22) 17.10.2016

(57) A segment 3 is made from concrete and has an external shape substantially the same as a segment used in shield tunneling. That is, the segment 3 comprises arc-shaped curved faces that face each other and side faces to couple the curved faces to each other. That is, a precast structure 1 comprising the segment 3 has a ring shape. A ring-shaped precast structure can be formed by connecting a plurality of segments 3 in the circumferential direction. Prestressing is applied by a tensioning member that spans the entire length of the connected segments 3 in...

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