近日,一座创造了三项“世界第一”建桥纪录的大桥钢管拱实现高精度合龙,它是世界上首次采用“二次竖转”工法施工的大桥——大瑞铁路澜沧江特大桥。澜沧江特大桥作为云南大瑞铁路(大理至瑞丽)大保段的控制性节点工程,全长528.1米,桥面距离江面超270米(相当于70多层楼高)。澜沧江特大桥采用“二次竖转”工法施工,在世界 Recently, a steel tube arch for the bridge that created three “firsts” of “bridge construction in the world” achieved a high-precision closure. It is the first bridge in the world to be constructed by the method of “second vertical rotation” Bridge. The Lancang River Bridge, a controlled node project of the Da-Bao section of Yunnan Darui Railway (Dali-Ruili), has a total length of 528.1 meters and a bridge deck over 270 meters above the river surface (equivalent to more than 70 storeys). Lancang River Bridge using “second vertical rotation ” method construction, in the world