PROBLEM TO BE SOLVED: To provide a structurally excellent and efficiently constructible shield tunnel floor slab.;SOLUTION: A floor slab 200 is constituted of a box culvert 200A installed in a central part in the width direction of a tunnel bottom part and a pair of right and left concrete blocks 200B installed by sandwiching the box culvert 200A in both end parts in the width direction of the tunnel bottom part. The concrete block 200B is divided into two of a lower member 203 and an upper member 204, and these divided surfaces S2 are horizontal. The concrete block 200B comprises a vertical plane opposed while separating a void to a tunnel sidewall part, and space-filling concrete 205 is placed in the void. Installation of the box culvert 200A and the concrete block 200B is executed between a shield machine and a succeeding carriage.;COPYRIGHT: (C)2015,JPO&INPIT
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