| 摘要 |
PROBLEM TO BE SOLVED: To follow the large interlayer deformation of a base isolation layer to prevent the dangerous slide motion in a platform in an escalator passing the base isolation layer of a base isolation building by constituting the support beam of the escalator by an expansible and contractible link mechanism, and connecting both the ends of the link mechanism to the upper and lower floors of the base isolation layer. SOLUTION: The support beam of an escalator 7 passing the base isolation layer E of a base isolation building is formed of an expansible and contractible link mechanism 30, and both ends of the link mechanism 30 are connected to structural bodies 14, 15 of the upper and lower floors of the base isolation layer E. Namely, in the link mechanism 30, a main support beam 31 is connected to a assisting auxiliary beam 32 by a rotating fulcrum 33 in the middle part, and the other ends of link members 35 connected to both ends of the support beam 31 and auxiliary beam 32 by rotating joints 34 are collected to one point, and connected to the structural bodies 14, 15 of the upper and lower floors by a pin 36. According to this, when a middle base isolation layer building is shaken by an earthquake to cause an interlayer deformation S in the base isolation layer E, the escalator is expanded and contracted as the movement of the link mechanism 30 so as to follow the interlayer deformation, whereby the dropping-out is prevented.
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