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| Key Construction Technology of Steel Truss Girder with Complex Vertical Curve Crossing over Expressway |
| HU Kemin |
| China Railway Group Limited, Beijing 100039, China |
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Abstract Research purposes: The upper span of a rapid transformation project is a (165+90) m continuous steel truss bridge, which has the special characteristics of large span, complex vertical curve, and expressway keep passing requirement under the steel truss girder during construction. This paper studies the setting and structure of temporary piers suitable for the dragging construction of steel truss beams with complex vertical curves during construction, the lightweight design of steel guide beams, and the low-level over pier of nodes with external convex bases, to ensure the safety of the steel truss girder and the expressway during the construction.
Research conclusions:(1) The overall construction scheme of steel truss girder with sub assembly and less fulcrum support and sub dragging is proposed. (2) It is proposed to set up four dragging temporary piers during dragging. The structure of the temporary pier adopts a simple truss support, and the top line of the temporary piers is set as a circular curve according to the fitting of the vertical curve of the steel truss beam, so as to ensure the stress safety of the dragging construction. (3) The guide beam suitable for large-span single continuous launching is set. The length ratio of the guide beam to the steel beam is 0.38, and the weight of the guide beam is 70 kN/m. The guide beam realizes the continuous dragging of the long-span steel truss beam crossing over expressway at one time, reduced the construction time crossing over expressway. (4) A separated sliding block for the convex base outside the support node is designed to solve the problem of low-level over pier. (5) The research results can provide reference for the construction of steel truss bridges crossing over important expressway or existing railway lines.
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Received: 18 March 2022
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2022, Vol. 39 
