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1 2012

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Niemierko A., Sokołowski J.

Archiwum Instytutu Inżynierii Lądowej

2012

Nr 14

173-183

Bump effect in transition zone is not only due to the movement between bridge structure and embankment produced by railway traffic or temperature diffence but also due to difference between deformability of railway track supported by embankment on one side and by bridge deck structure on another. This discontinuity of track behaviour is a reason of differential deformability and a cause of dynamic effects in vehicles. They have great influence on safe and comfortable passage of trains especially those running with high velocity. Solutions used for tempering this bump effect could be as follow: slab track (e.g. ERS, EBS or RHEDA), transition plates, technical blocks using cement stabilizing backfill, courses of geogrids, additional rail systems, variable characteristics of sleepers, integral bridges, gradual ballast bonding, reinforcement of embankment using piles or columns, reinforcement of backfill by nailing. More in detail the new solution for aproach track invented by J.Sołkowski was described. In special case of transition between unballasted track on bridge deck and abutment good result was obtained using short transition span. Rules for transition zone track designing were presented determining the length of this zone, its rigidity and deformability, stress levels under sleepers, as well as admissible differences in mechanical track characteristics depending on category of railway line.