To provide a segment whose strength is not deteriorated even when suffered from a fire, and to provide its manufacturing method.
The segment 3 is composed of an inner layer 7, which includes the inner peripheral face 5a of the segment 3 and faces the inner peripheral face 5a side, and an outer layer 9 including the outer peripheral face 5b of the segment 3 and facing the outer peripheral face 5b side of the inner layer 7. The outer layer 9 is formed by casting high-fluidity concrete 11, into which steel fibers are mixed, and pre-designed so as to hold a tunnel 1 only with the outer layer 9. The inner layer 7 is formed by casting high-fluidity concrete 13, into which a thermoplastic resin is mixed, so as to prevent explosion fracture of the inner layer 7 by releasing steam occurring in the inner layer 7 into the tunnel 1 while forming voids by melting of the thermoplastic resin along with protecting the outer layer 9 from heat by fire when the fire occurs in the tunnel 1.
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SATO TAKETO
KIDA HEIHACHI
URANO TOMOKO
FUJII AKI
HAYASHI SEITAKU
| JP2004011312A | 2004-01-15 | |||
| JPH08187708A | 1996-07-23 |