- 期刊
國道3號烏溪1號橋預力箱型梁長期檢監測系統建置與初步成果
Establishment and Preliminary Result of Long-Term Inspection and Monitoring System in Wuxi No. 1 Bridge on National Highway 3
摘要
隨著預力橋梁數量成長，以及已通車使用時間增長，預力箱型梁之維護補強需求亦漸增，而長期檢監測系統在驗證維護補強成效及橋梁全生命週期管理等面向扮演重要角色。本文以國道3號烏溪1號河川橋為案例，介紹該橋於國道後續路段橋梁耐震補強工程（區段2-1）中進行上部結構承載能力補強後，橋梁長期檢監測系統之建置規劃、配置及完工後至目前之檢監測成果，以驗證本工程補強成效，並提供後續橋梁管理及養護參考依據。針對橋梁橋面線型變化，以連通管沉陷計及位移計進行監測，並配置溫度計以納入溫度效應補償；針對外置預力鋼腱索力，規劃採磁通量感測器（elasto-magnetic sensor, EMS）進行量測，並預留量測導線以非破壞性方式檢測鋼腱之腐蝕程度。依完工後檢、監測成果，本補強工程已成功抑制橋梁過往持續性之變形下垂，預力鋼腱亦無產生腐蝕或過量索力損失等情形。
並列摘要
With the proliferation of prestressed concrete bridges and the aging of existing structures, the demand for maintenance and retrofitting has surged. The inspection and monitoring system play a crucial role in verifying the effectiveness of maintenance and strengthening efforts, as well as bridge management during service life. This article presents a comprehensive case study based on the retrofitting project of Wuxi No. 1 Bridge on National Highway 3, detailing the installation, configuration, and outcomes of the long-term inspection and monitoring system implemented following the strengthening of the bridge's superstructure. The aim is to validate the effectiveness of the strengthening work and provide a reference for other bridge management and maintenance cases in the future. For monitoring the bridge's deck profile changes, settlement gauges and displacement meters were employed, with thermometers installed to account for temperature effects. To measure the forces in the external prestressed tendons, an elasto-magnetic sensor (EMS) was used, and additional measurement wires were installed to facilitate non-destructive testing of tendon corrosion. According to the inspection and monitoring results following the retrofitting, the strengthening project has successfully mitigated the previous continuous downward deformation of the bridge, and no corrosion or significant loss of tension in the prestressed tendons has been observed.