体外预应力加固法加固双曲拱桥的应用  

Application of External Pre-stress to Reinforce The two-way Curved Arch Bridge

作　　者：魏洪昌[1] 

机构地区：[1]交通部公路科学研究院,北京100088

出　　处：《公路交通科技》2006年第S1期74-76,共3页Journal of Highway and Transportation Research and Development

摘　　要：某净跨径34m的双曲线,运营近20年检查发现拱顶下沉达12cm,拱顶和拱脚开裂严重,裂缝最大宽度最大达8～10 mm,必须进行加固处理。根据对该桥的检测评价情况,结合病害和承受繁重交通的限制条件,采用体外预应力进行加固。加固后的荷载试验表明承受能力得到恢复,取到了较好的效果,为双曲拱桥拱顶下沉、拱脚开裂病害的自治提供了一种新的思路。After poerating 20 years,when a double curved arch with 34 m clear span was checked,it was found that arch apex settles 12 cm and arch apex and arch springer cracks.The biggest width of crack reach 8～9 mm.They must be strengthened.According to the detection evaluation,damage and limited condition of heavy traffic,the method of external prestress is used to strengthen the bridge.After consolidation the load test shows that the bearing capacity resumed obviously.It gets better effect and provides a new method...

关 键 词：主拱圈 裂缝 体外预应力 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]