To provide a steel plate shell segment and a shield excavation method capable of simplifying an earth pressure load supporting method, facilitating assembly and conveyance of a segment, and reducing an amount of excavated soil.
On the inside face of a shell-shaped base segment formed of a steel plate and used for lining of a tunnel bottom part, a pair of left and right vertical rib members, which is provided with strength rigidity bearable with the earth pressure load and applicable as a pair of left and right rail members for traveling left and right traveling wheels 45 of a rear carriage 10 in a shield machine 1, and a pair of horizontal rib members connecting the front and rear ends of the vertical rib members together arranged, so that the earth pressure load can be transmitted to a base segment 28A by effectively using the rear carriage 10 to be supported by the vertical rib members.
SHIMIZU MITSUO
KOMATSUBARA YASUO
BANDO KOJI
MASUDA TOSHIICHI
KAJIMA RYUNOSUKE
UGA KATSUO
KAWASAKI STEEL CO
SHIMIZU CONSTRUCTION CO LTD