橋梁設(shè)計外文翻譯--荷蘭跨線高架橋-在線瀏覽
2024-07-23 13:35本頁面
【正文】 ergola constructions’ are often built, consisting of long rows of columns along the trackwhich support a concrete deck with a span direction perpendicular to the tracks passingunderneath. The pergola would in this situation be 160 m long and vary between 14 m and 28m in width. For aesthetic and economic reasons, an innovative solution has been developed: Thesuspension of the crossing Ushaped bridge from a pylon which is constructed over the tracksthat will be running underneath (fig. 3). This creates a transparent construction thatguarantees a view of the countryside and clearly expresses the forces at work. This bridge isthe first of its kind in the Netherlands. Despite the high construction cost of the pylon, the total cost of the solution chosen is lowerthan for a pergola. The suspension from the pylon is such that the forces in the Ushaped bridge work as evenlyas possible and high peak stresses are avoided. The load from the Ushaped beams is divertedto the three suspension cable anchors per beam underneath. The cables run via conduitsthrough the beams to the intersection of the ridge beam and the slanting pylon columns (fig. 4). The horizontal loads from the bridge are fed directly to the columns of the pylon via ridgeslocated on the outside of the Ushaped beams. 4. CONSTRUCTION ASPECTS Static system superstructure The flyover is constructed from six bridge sections. The bridge parts are mounted onreinforced rubber bearings. At their extremes, the sections are fixed horizontally in the crossdirection by steel guiding constructions that primarily absorb the horizontal thrust forces andcentrifugal forces。 508 mm with a wall thickness of 16mm. The piles are filled with concrete and fitted with reinforcement. The use of steel pipepiles for the abutments was made necessary by the settlement of the connecting raised trackbeds as a result of the pressible subsoil which might subject the piles to bending. Prestressedconcrete driven piles turned out not to be able to absorb these bending moments. The columns under the Ushaped bridge ends are coupled crossways with a beam constructiondue to the horizontal forces that are diverted there via the guiding constructions. In order to be able to quantify the interaction of the track with the substructure, a tracklongitudinal forces program has been developed in which the whole system is divided intodiscrete ponents by means of the following elements: rail elements。 bridge elements。 pile elements。 cross prestressing of the Ushaped ends in the base. This absorbs the shear tensionsthat are generated as a result of the longitudinal prestressing. For the 167 m long trackcrossing section VI, a 27strand longitudinal prestressing systemwas chosen with strands 216。 400 mm thro
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