橋梁設(shè)計外文翻譯--荷蘭跨線高架橋-文庫吧資料
2025-05-21 13:35本頁面
【正文】 . Eight units are used for each beam. For thecross prestressing, the BBRV system, which is not liable to wedgesettlement, was chosen. This was due to the relatively short length (approx. m), which means that the effect ofwedge settlement would have been too great on the extent of the prestressing. The average prestressing level in the Ushaped bridges is between and N/mm2. An additional plication arose at the pylon where the bridge is suspended with vertical guycables. There are three guy cables for each Ushaped beam which are carried via steelconduits 216。 foundation elements. The bridge system is physically described with these elements, and the acpanyingparameters are entered for each type. Generally, CWR track is used. If, however, the expanding bridge lengths bee too great, ‘pensation’ welds or pensation constructions, in which the track has overlapping ‘tongues’ and so is free to undergo deformation, must be used due to the rail forces reachingtoo high a level as a result of braking forces and temperature effects. At the location of one of the intermediate supports, bridge section VI is suspended from apylon construction where the bridge is also fixed horizontally. Due to the high stiffness of thisconstruction, this determines the free expansion length to the abutment. This length is greaterthan 60 m, the maximum free expansion length to an abutment for ballasted track. For thisreason two pensation welds are used at the abutment. Prestressing The Ushaped bridges are constructed from prestressed concrete. The following can be distinguished: longitudinal prestressing in the Ushaped beams, through which the beam’s ownweight, the permanent load and the working load are diverted。 bearing elements。 ballast elements。 the ends of the bridge are free to move in the longitudinal direction. Thesection crossing the track is also fixed at the pylon both in the cross direction and in thelongitudinal direction by horizontal struts between the Ushaped floor and the pylon. Substructure The foundations of the flyover are primarily prefabricated prestressed 450 x 450 mm2 concrete piles with a length varying between 13 m and 18 m and with a pile depth varyingfrom m to m below ground level. Both abutments have a foundation of steel pipe piles 216。 a polder drainage pool。附錄 4 外文文獻(xiàn)翻譯 RAILWAY SUSPENSION BRIDGE IN WOERDEN, THE NETHERLANDS SUMMARY In Woerden, a small town in the west of the Netherlands, a railway flyover has been builtwhere two railway tracks meet. The flyover consists of a singletrack viaduct. This has alength of m. The crossing angle is 10 degrees. At the flyover site the viaduct is suspended from a pylon that has been constructed over two tracks passing underneath. 1. INTRODUCT
畢業(yè)設(shè)計相關(guān)推薦
鄂ICP備17016276號-1