Key Techniques to Relocate 1 600 t-Capacity Crane in Construction of Tongling Changjiang River Rail-cum-Road Bridge Carrying a Section of G3 Expressway
Carrying a section of G3 expressway,the Tongling Changjiang River Rail-cum-Road Bridge is a hybrid cable-stayed suspension bridge with a main span of 988 m,two side spans of 131 m and two side spans of 127.5 m.The stiffening girder consists of two planes of Warren trusses that measure 13.5 m deep and are 35.0 m apart along the bridge width.The construction of the stiffening girder started from the south bank,using a 1 600 t-capacity girder erection crane(weighing about 840 t),once the girder segment Z32Z33 was placed into position,the girder erection crane had to be relocated at the north bank by using two 1 000 t-capacity barge cranes to continue the construction of the stiffening girder.To ensure a smooth relocation,the 1 600 t-capacity girder erection crane was added with corbels,but shook off pieces of components to suit the loading capacity of the barge cranes.Numerical modelling was conducted to find the gravity center of the girder erection crane.Four soft riggings of different lengths were deployed to keep the lifting lugs of the barge cranes overlap with the gravity center line of the girder erection crane.The deployment sequence and locations of the barges as well as the way of barge mooring were studied to facilitate the positioning of barges under the restriction of crossing anchors.The inclination and rotation of the girder erection crane during the relocation process was monitored in a BIM platform,to guarantee the bias of the longitudinal and transverse distances of the two barge cranes does not exceed 100 cm,and the bias of the horizontal moving distance of longitudinal anchors of the barge cranes does not exceed 100 cm.Additionally,the vertical distance between the two barge cranes during lowering should not be over 50 cm,to ensure that the girder erection crane be safely relocated at the north bank.
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