To provide a direct-coupled track structure in which the fatigue strength of a subbase course composed of a cement curable material is increased by optimizing the mixing ratio of short fibers and the breakdown of the subbase course can be prevented.
In the direct-coupled track structure in which a section between a concrete floor slab 1 and a sleeper 2 is connected by the subbase course 3 consisting of the cement curable material such as concrete, mortar or the like, the short fibers at a volume ratio of 1 to 5% are mixed in the cement curable material constituting the subbase course 3. When the mixing ratio of the short fibers is set in 1% or more, the tensile stress of concrete or mortar is suddenly reduced temporarily immediately after the generation of a crack but it is changed abruptly into an increase temporarily, thus augmenting fatigue strength.
NAKAHARA SATORU
ANDO KATSUTOSHI
HORIIKE TAKAHIRO
MUKAI AKIRA
WATANABE TADATOMO
MATSUOKA SHIGERU
RAILWAY TECHNICAL RES INST
HOKUBU CONSULTANT KK
TEKKEN CONSTR CO