黄金坪水电站导流洞出口交通桥桥台应急抢险

Emergency rescue for bridge abutment at outlet of diversion tunnel of Huangjinping Hydropower Station

2012年6月汛期,大渡河洪水猛涨,黄金坪水电站导流洞泄流量急剧增大,洪水强烈的冲刷使跨导流洞出口的交通桥桥台出现裂缝,桥梁和导流洞处于失稳状态。为确保桥台安全,对桥台地基进行了加固处理和桥台防护处理。具体施工方案为:分别对左右桥台帷幕灌浆,并对左侧桥台采用连排桩进行加固处理。相关措施取得了良好的效果,确保了桥台稳固及交通安全。对施工方案和施工流程进行了详细介绍,以期为今后类似抢险施工提供参考借鉴。

In flood season of 2012,the flood of Dadu River rose fast,resulting in the increase of discharge from the diversion tunnel of Huangjinping Hydropower Station. The severe flood scouring caused the abutment cracking of the bridge crossing the diversion tunnel and made the abutment and diversion tunnel unstable. To ensure the safety of the abutment and the diversion tunnel,the bridge abutment foundation was reinforced and the protective treatment was carried out to the abutment. The construction scheme included the curtain grouting for the bridge abutments at left and right banks and the reinforcement by row- pile for left abutment. The measures had obtained success and ensured the abutment stability and smooth traffic. This paper gives a detail introduction to the construction scheme and process to provide reference for the similar emergent treatment.