橋梁設(shè)計外文翻譯資料--超輕大跨度橋-橋梁設(shè)計-在線瀏覽
2024-07-23 13:35本頁面
【正文】 icularly good. The structure is a single cell, prestressed rectangular box girder, largely built using the travelling formwork system from NRS. The box width is 7m and its depth varies from 3m at the centre of the span to over the piers. Close to the abutments, concrete of quality C25 will be used inside the box girder as ballast. In addition, the designers have included the necessary elements inside the box girder in order to allow the possible addition of posttensioning cables in the future. The longterm behaviour of such large spans is not fully known, so the possibility that the main span may sag over time has to be taken into account. The width of the road is a constant from the barrier on one side to that on the other, and the total width of the bridge is some . There is a 2m wide footway included in the width of the structure. The pier shaft is formed with twin legs, which are hollow inside. The pier shafts incorporate permanent prestressing cables and they have a constant wall thickness and a width that varies parabolically over their height. Temporary tiedown piers are used to construct the bridge they are located 35m into each 120mlong side span from the main piers. Each consists of an Ishaped shaft, which is tied down to the ground using rock anchors and connected to the box girder by means of prestressing cables. The purpose of these structural elements is to support the cantilever and prevent rotation in strong winds. Once the bridge superstructure is plete and the main pier prestressing is fully tensioned, the temporary tiedown piers will be removed piece by piece. ****大學(xué)畢業(yè)設(shè)計（論文） 3 The location of the bridge, only about 100km south of the Arctic Circle, has meant that special measures have to be introduced to allow construction work to continue all year round. Apart from the obvious need to provide site lighting for much of the wintertime, the challenge of concreting in temperatures which can be as low as 0 C has to be overe. Hot concrete is produced for the bridge ?sometimes up to 30 C and the formw
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