公安长江公铁两用特大桥非通航孔钢桁梁架设技术

发布时间：2018-09-03 10:47

【摘要】：公安长江公铁两用特大桥非通航孔(6~10号墩)采用4×94.5m连续钢桁梁结构,连续钢桁梁采用双片主桁结构,主桁中心距14.0m、桁高13.0m、节间距13.5m,共28个节间,主桁弦杆采用焊接整体节点,上、下弦杆在节点外采用高强度螺栓拼接。通过对钢桁梁架设方法研究,并结合工程特点及现场情况,该桥非通航孔钢桁梁采用WD70型全回转架梁吊机散拼法安装,在10号墩后方(公安侧)设置架梁拼装支架,自10号墩向6号墩方向逐节间、逐孔架设钢桁梁。其中,9号至10号墩间钢桁梁采用膺架法拼装;8号至9号墩间钢桁梁采用半悬臂拼装架设法拼装;6~8号墩间钢桁梁采用全悬臂拼装法拼装。该桥钢桁梁于2015年9月1日完成,架设过程质量安全可控,架设后钢桁梁线形良好,满足设计要求。
[Abstract]:The non-navigable holes (pier 6 ~ 10) of the public security Yangtze River double-purpose railway bridge adopt 4 脳 94.5m continuous steel truss structure, and the continuous steel truss uses two pieces of main truss structure. The main truss is 14.0mapart, the truss is 13.0mtall, the pitch is 13.5m. there are 28 joints in total, the main truss chords are welded integral joints. Upper and lower chords are jointed with high strength bolts outside the joints. Through the research on the erection method of steel truss beam, combined with the engineering characteristics and the field situation, the steel truss beam of non-navigable hole of the bridge was installed by WD70 type full rotary beam crane loose splicing method, and the erection support was set up behind the 10 # pier (public security side). From Pier 10 to Pier 6, set up steel truss beam by hole. Among them, the steel truss beam between pier 9 and 10 is assembled by the pseudoframe method, the steel truss beam between pier 8 and 9 is assembled by semi-cantilever assembly and the steel truss beam between pier 6 ~ 8 is assembled by the full cantilever assembly method. The steel truss of the bridge was completed on September 1, 2015. The quality of the erection process is safe and controllable, and the steel truss has a good alignment after erection, which meets the design requirements.
【作者单位】：中铁大桥局集团第四工程有限公司;
【分类号】：U445.46

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