طراحي و ساخت تراورسهاي دو لنگه

Design and fabrication of two half laminated sleepers

The process of lamination can permit manufacture sleepers from logs with small-end diameters. Therefore studies for manufacturing two half laminated ties (interface vertical or horizontal) were done. As in Iran beech is usually used for manfacturing sleepers, in this study it was also utilized to make two half laminated sleepers, The processes of impregenation of dowel-laminated sleeoers with preservative (Creosote) and depth of its penetration were bending estabilished than isusual sleepers. Laboratory test indicated that static bendig strength of two half laminated vertical sleepers was as same as usual sleepers but significantiy more than ones two half laminated - horizontal sleepers. Finally after five years exposure under extensive service tests, no filures were seen in dowel laminated sleepers especialiy in vertical shape.