摘要
铜陵公铁两用长江大桥主桥为(90+240+630+240+90)m五跨连续钢桁梁斜拉桥。主梁采用3片主桁,N形桁架,3片主桁均为双节间全焊桁片结构,双节间全焊桁片长30m、宽2.85m、高18m,单榀桁片最重360t,每榀桁片由上、下弦杆及腹杆全焊接而成。主桥钢桁梁采用双节间全焊桁片及上、下桥面板分块整体制造技术,为了保证桁片制造精度,全焊桁片采用"2+1"匹配制造技术,将桁片上(下)弦杆、竖腹杆及斜腹杆单件制造成型后再进行桁片总拼,3个全焊桁片在胎架上制造完后,其中前两个全焊桁片出胎,最后一个桁片移至前端作为母梁,匹配拼装后续桁片,直至全部匹配完成。目前,该桥钢桁梁已安装完成,制造精度满足规范要求。
The main bridge of Tongling Changjiang River Rail cure Road 13rtdge is a Ilve span continuous steel truss girder cable-stayed bridge with span arrangement （90 ＋ 240 ＋ 630 ＋ 240 ＋ 90） m. The main girder of the bridge is comprised of 3 N-shape main trusses and the trusses are all of the two-panel all-welded truss unit structures. A two-panel truss unit is 30 m long, 2.85 m wide, 18 m high and the heaviest unit weighs 360 t. The truss unit is formed by welding the up- per, lower chords and web members. For the manufacturing of the main girder, the techniques of manufacturing the two-panel all-welded truss units and the upper and lower deck plates in blocks in integrity are used. To ensure the manufacturing accuracy of a truss unit, the technique of the＂ 2＋ 1＂ match manufacturing is used. After a upper chord, lower chord, vertical web member and inclined web member of the unit are manufactured, the unit is then generally assembled. 3 all- welded truss units are manufactured on one jig stand. When the previous two units are manufac tured and moved out of the jig stand, the last unit is moved to the front and is used as the parent girder, the successive truss units are continuously match assembled until all units are assembled. Presently, the erection of the truss girder of the bridge has been completed and the manufacturing accuracy of the truss girder can meet the relevant requirements in the codes.
出处
《桥梁建设》
EI
CSCD
北大核心
2014年第1期6-10,共5页
Bridge Construction
关键词
铁路公路两用桥
斜拉桥
钢桁梁
全焊桁片
焊接
制造技术
桥梁施工
rail-cum-road bridge
cable-stayed bridge
steel truss girder
all-welded truss unit
welding
manufacturing technique
bridge construction
