武汉二七长江大桥边跨混凝土主梁施工关键技术

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发布时间：2021-10-23

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武汉二七长江大桥主桥为 (9O+ 160+2×616+ 160+90)m 三塔双索面混合梁斜拉
桥，其边跨 90 m 主梁采用混凝土边主梁断面。混凝土主梁在临时墩、贝雷梁支架上分 3段现浇施
工。为保证施工安全，现浇支架上部采取贝雷梁桁架结构，设置 8个临时墩，同时对支架进行全过
程的监控。施工中采用专用支架确保了主粱索道管精确定位；利用千斤顶对钢一混凝土结合段钢
梁精确定位，并采取防裂措施保证了混凝土浇筑质量。
关键词：武汉二七长江大桥；斜拉桥；混合梁；钢一混凝土结合段；桥梁施工
中图分类号：U448．27；U445．4 文献标志码：A
Key Techniques for Construction of Concrete M ain Girder
for Side Spans of Erqi Changj iang River Bridge in Wuhan
H UANG Xian—yu
(Section of Contract III，Construction Project II of Main Bridge of W uhan Erqi Changjiang River
Bridge，China Railway Major Bridge Engineering Group Co．，Ltd．，Wuhan 430000，China)
Abstract：The main bridge of Erqi Changj iang River Bridge in Wuhan is a hybrid girder cablestayed bridge with three pylons。double cable planes and with span arrangement(90+ 1 60+ 2×
616+ 160+ 90) m． The 90一m m ain girder for the side spans of the bridge is designed as a cross
section of edge girders and the concrete of the girder is cast in situ in three segm ents on the tern—
porary piers and bailey truss scaffolding． To ensure the safety in the construction， the bailey
truss structure was used as the superstructure of the scaffolding，8 temporary piers were arranged
and the scaffolding was monitored in the whole process． The special supports were also used to
ensure accurate positioning of the cable ducts in the girder．The steel girder of the steel and con—
crete joint section was accurately positioned by jacks and the anti—cracking measures were accord—
ingly taken to ensure the quality of the concrete casting．
Key words：Erqi Changj iang River Bridge in Wuhan；cable—stayed bridge；hybrid girder；
steel and concrete j oint section；bridge construction
1 工程概况
武汉二七长江大桥主桥为三塔双索面混合梁斜
拉桥，跨径布置为 (90十 160+ 2× 616十 160+ 90)
m l1 ]
，其中(160+2×616+160)m 为钢一混凝土
结合梁，边跨 90 m为混凝土梁，靠钢一混凝土结合
梁端边跨内 4．5 m长为钢梁与混凝土梁的结合段，
武汉二七长江大桥立面示意见图 1。该桥 6～ 7号
墩间混凝土主梁跨越武昌防洪大堤，梁底距离地面
高约 21 m。边跨主梁采用混凝土边主梁结构，顶口
宽 32．3 m、底口宽 32．7 m，梁高 3．5 m，见图 2。纵
向沿桥轴线两侧 16．15 m 各有宽 4．0 m、高 3．177
m的主梁腹板；顺桥向每隔 4．0 m设 1道宽 0．35