Statical study of the bending produced in a rail in the hanging-monorail system for logging use

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  • 集材用懸垂式モノレールにおけるレールの曲げに関する静力学的研究
  • シュウザイヨウ ケンスイシキ モノレール ニ オケル レール ノ マゲ ニ カ

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Recently a type of hanging-monorail system has been developed mainly for the purpose of logging thinnings. One of the most remarkable features of the system is that a rail is suspended from a multispan skyline cable with hangers attached to the rail at one-meter intervals. The cable is stretched between two anchor trees at eye level and is supported by many temporary supports spaced at less than 4.5m. A train consisting of a locomotive car, a braking car, and one or two flat bogie cars, runs on the rail while suspended from it. Each flat bogie car has two trolleys connected by a rod. This paper deals with the bending moment and deflection produced in the rail due to the train load as a problem of structural mechanics. A method of calculation is established, whose main purpose is to determine the reaction at each hanging point of the rail. The fitness of the theoretical results is evaluated by field experiments. The characteristics of the bending moment and the deflection are studied on the basis of numerical calculations. The maximum value of the bending moment produced by a train increases approximately linearly with the weight of the greatest trolley load in the train and with the length of the span, and inversely with the square root of the cable tension.

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