LINING SEGMENT, ASSEMBLING STRUCTURE AND METHOD THEREOF

PROBLEM TO BE SOLVED: To prevent apertures due to water pressure from the inside of a tunnel for underground river from generating when lining segments are used for the tunnel for underground river, and reduce cost by a simple structure. SOLUTION: A lining segment is formed of an arcuate plate. On both end parts in the circumferential direction of the arcuate plate, parts 21, 22, 23, 24 projecting from both side parts 12, 13 of the arcuate plate and having the same thickness as that of the arcuate plate are formed, and further both end faces 14, 15 in the circumferential direction of the plate are formed into taper faces. When a plurality of the lining segments are connected together in the circumferential direction and the axial direction of a tunnel to cylindrically line the inner wall side of the tunnel, the projecting parts 21, 22, 23, 24 of the adjoining lining segments in the axial direction of the tunnel are engaged with each other, and the respective lining segments are not separated from the circumferentially adjoining lining segments.