中承式系杆拱桥吊杆更换施工监测

Construction Monitoring of Suspender Replacement for Half-through Tied Arch Bridge

某中承式钢管混凝土系杆拱桥,在运营过程中,中跨下游的跨中吊杆出现松弛退出工作现象,结合该桥实际状况,经综合分析,决定对问题吊杆立即予以更换。文章重点介绍了在吊杆更换过程中,吊杆索力、拱肋及桥面变形的监测情况,监测情况表明,吊杆更换之后,桥梁恢复正常运营状态。

The suspender of the bridge which is a half-through concrete-filled steel tubular tied arch bridge appears stress relaxation in service.Considering the actual situation of the bridge and with the comprehensive analysis,the suspender which has stopped work must be replaced.The paper introduces the monitoring of cable force,arch rib and deck deformation in the process of suspender replacement.It shows that the bridge is in normal operation condition after replacement.