上跨高速复杂竖曲线钢桁梁施工关键技术

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摘要 研究目的:某快速化改造工程上跨高速段为(165+90)m连续钢桁梁桥,具有跨度大、结构竖曲线复杂、施工期钢桁梁下方高速要求保通等特殊特点,为此,本文对适用于复杂竖曲线钢桁梁拖拉施工用临时墩设置及结构、钢导梁轻量化设计、带外凸底座节点低位过墩等问题展开研究,确保施工期间钢桁梁受力安全及下方高速在施工期的保通。
研究结论:(1)提出了钢桁梁采用分次拼装少支点支撑分次拖拉的总体施工方案;(2)提出了设置4处拖拉临时墩方案,临时墩结构采用了桁式支架,顶面线形根据钢桁梁竖曲线拟合设置为圆曲线,确保拖拉施工受力安全;(3)研究了适用于大跨度单次连续顶推的导梁,导梁钢梁长度比为0.38,三桁导梁线重为70 kN/m,实现了大跨度钢桁梁一次性连续拖拉上跨高速,减少了上跨高速施工时间;(4)设计了分离式滑块,解决了支座节点外凸底座低位过墩问题;(5)本研究成果可为上跨既有重要高速或既有铁路线路钢桁梁桥施工提供借鉴和参考。

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	胡科敏

关键词 ：连续钢桁梁桥, 复杂竖曲线, 桁式支架, 导梁, 分离式滑块

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.

Key words： continuous steel truss bridge complex vertical curve truss support guide beam separated sliding block

收稿日期: 2022-03-18

PACS:	U448.121
	U443.22

作者简介: ^**胡科敏,1980年出生,男,高级工程师。

引用本文:

胡科敏. 上跨高速复杂竖曲线钢桁梁施工关键技术[J]. 铁道工程学报, 2022, 39(9): 44-49.
HU Kemin. Key Construction Technology of Steel Truss Girder with Complex Vertical Curve Crossing over Expressway. Journal of Railway Engineering Society, 2022, 39(9): 44-49.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I9/44

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