安庆长江铁路大桥主桥为主跨580 m的多跨连续钢桁梁斜拉桥,该桥3号墩基础采用圆形双壁钢围堰施工,围堰定位采用无导向船重锚锚碇定位系统.针对3号墩基础深水无覆盖层地质条件下围堰施工,为实现围堰的精确定位,从钢筋混凝土梳齿锚、收锚平台及转向马口3个方面进行围堰锚碇定位系统研究.围堰部分锚碇采用钢筋混凝土梳齿锚取代铁锚,钢筋混凝土梳齿锚由混凝土实体、起吊座、锚座、梳齿组成；围堰部分边锚通过新型转向马口转向至前、后定位船收锚；锚绳转向采用新型马口结构.%The main bridge of Anqing Changjiang River Railway Bridge is a multi-span continuous steel truss girder cable-stayed bridge with a main span 580 m and the foundation for the Pier No. 3 of the bridge was constructed by the circular double-wall steel boxed cofferdam that was positioned by the heavy anchor anchorage system without utilizing the guiding barge. In the light of the construction of the cofferdam under the condition of deepwater and geology without o-verburden and to achieve the purpose of accurate positioning of the cofferdam, the positioning system for the cofferdam was systematically studied from three aspects of the reinforced concrete (RC) comb anchors, anchor weighing platform and steering fair leaders. According to the study, it was determined that for part of the anchors of the cofferdam, the iron anchors should be replaced with the RC comb anchors and a comb anchor of such type was composed of the concrete body, lifting base, anchor base and comb teeth. Part of the side anchors of the cofferdam were steered to the front and rear positioning barges via the new type of the steering fair leaders and were weighed on the barges there and for steering of the anchor ropes, the new type of the steering fair leaders were provided also.
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