某拱桥系杆换索设计与施工

Design and Construction of Cable Replacement for Tie Members of a Tied Arch Bridge

某系杆拱桥运营2年后,系杆腐蚀导致2根系杆突然断裂,更换2根系杆后安装12根应急系杆作为应急措施,后研究决定对该桥余下38根系杆予以更换。该桥34根系杆由19股钢绞线更换为22股钢绞线,其余4根与原设计相同(13股)。采用特制长手柄砂轮人工切割系杆,用临时台座上张拉的临时索(应急系杆)代替切断系杆,切断一根系杆后,安装张拉该系杆、切割下一根系杆。采用喷砂除锈和注入防锈油脂防腐蚀工艺防止系杆钢绞线腐蚀。系杆更换后至今桥梁运营工作状况良好。

After a tied arch bridge was put into operation for 2 years,the corrosion of tie members of the bridge led to the sudden break of 2 tie members.At the time the 2 members were replaced,12 new tie members were installed as an emergence measure.Not long afterwards,it was decided that all the remaining 38 tie members of the bridge should be replaced.Of these 38 members,34 were made up of 19 steel wire strands which were to be changed into 22 strands while the rest of 4 made up of 13 strands would be kept identi...