Research on Balanced High-precision Suspension Construction Technology of Double Gantry Crane for Urban Segmental Precast Bridge
Aiming at the construction of segmental prefabricated bridge with high requirements for quality and efficiency of suspension assembly,combined with the actual construction situation of the first construction contract section of Dongguan section of Shenzhen Outer Ring Expressway,through in-depth study of the existing concrete bridge segmental prefabricated assembly technology,a double gantry crane cantilever assembly construction method is proposed.Specifically,the gantry crane track is laid along the erection direction of the concrete bridge,and the prefabricated segments of the bridge are hoisted synchronously and symmetrically;the six-point coordinates of the segment are adjusted by adjusting the bearing and the universal spreader to ensure the installation accuracy of the stage.The post-pouring wet joints were constructed by hanging formwork method to complete the precast assembly construction of concrete bridge segments.Compared with the traditional technology,the overall construction efficiency and safety have been significantly improved,and the quality of segment splicing has also been further guaranteed.
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