南京二桥南汊桥主桥钢箱梁的吊装及挂索施工.rar

南京二桥南汊桥主桥钢箱梁的吊装及挂索施工
贺新文 钟永刚 李文光
（湖南省公路桥梁建设总公司）
【摘要】本文通过对南京二桥南汊主桥B3标工程主要施工过程的回顾，总结了该桥钢箱梁支架、吊装、滑移及挂索和张拉等诸多施工方案的实施及某此难点问题的解决特别对其中一些较为成熟和值得推广的施工工艺进行了经验性的概括。
【关键词】南京二桥 钢箱梁 斜拉索 临时排架 滑移 无索区托架 悬吊 调梁抗风稳定

一、B3标工程概况
南京长江第二大桥是列入国家“九五”重点建设项目的工程之一，其南汊主桥横跨长江主航道，由中交公路规划设计院设计为58.5+246.5+628.0+246.5+58.5（m）五跨连续双塔双索面全断面焊接的钢箱梁斜拉桥。其628m的主跨跨径目标在同类型桥中居国内第一，世界第三。
B3标为该桥上部构造预制钢箱梁的吊装架设及挂余张拉施工。施工范围北起25号过渡墩，南至30号过渡墩。跨越南汊河道，包括水上、桥面和塔上高空作业，施工面较广。其五跨连续钢箱梁总长为 1233.9m。根据桥址处自然条件、钢箱梁构造和施工架设的需要，主梁划分为A～ L共 12种类计93块梁段（表 1）。标准梁段长达 15m，宽 38.2m，梁高 3.5m，
吊装重量近300t（加上随梁附件）。斜拉索采用7mm镀锌高强度低松弛平行钢丝，外挤包高密度聚乙烯材料，标准索距为15m（辅助跨为 12m），最大索长 335.743m，最大索重达 26 .7t。如此大跨径桥梁施工、长拉索挂设、重钢梁悬吊。多工作面立体作业，其施工难度很大，施工方案和架设技术无疑都面临极大的考验。加之桥位处于长江下游地带，水深流急，浪高风大．过往船舶众多。这些对运梁船、放索船、浮吊的就位稳定、钢箱梁的悬吊及挂
Nanjing 2 BRIDGE main bridge lifting and hanging steel box girder cable installation
He Xinwen Zhong Yonggang Wenguang
(Hunan Road and Bridge Corporation)
Abstract Based on the Nanjing Second Bridge Branch Main Bridge B3 standard review process of major construction projects, summed up the steel box girder bridge support, lifting, sliding and hanging cable and tension, and many other construction plan and an implementation of this particularly difficult problems to solve some of the more mature and worthy of the construction process was empirical generalizations.
Key words Nanjing Bridge temporary bent steel box girder cable-stayed cable-free zone slip transfer beam wind stability of suspension bracket

1, B3 standard project profile
Second Nanjing Yangtze River Bridge is included in the national "Ninth Five-Year" project one of the key construction projects, the South Branch of the main bridge across the main channel of the Yangtze River, the Central Highway Planning and Design Institute +246.5 +628.0 +246.5 +58.5 to 58.5 (m) five-span continuous twin double cable planes full section welded steel box girder cable-stayed bridge. The 628m main span of the target in the same type of bridge span in the home country first, third in the world.
B3 standard structure for the Department of prefabricated steel box girder bridge, the lifting and erection of tension hanging over the construction. Construction of the transition area north pier 25, south abutment 30. Across the South Branch River, including water, bridge and tower-height, construction covers more. The five-span continuous steel box girder total length of 1233.9m. Department under natural conditions, bridge site, construction and erection of steel box girder needs, the main beam is divided into A ~ L 12 total 93 types of beam section (Table 1). Standard Beam up to 15m, width 38.2m, beam height 3.5m,
Weight lifting nearly 300t (with the beam with annex). 7mm cable with galvanized steel wire of high strength and low relaxation parallel to the outer extruded high density polyethylene material, standard cable distance of 15m (auxiliary span 12m), the maximum cable length 335.743m, the largest cable weighs 26 .7 t. Such a long span bridge construction, cable hang long, heavy steel beams suspended. More face-dimensional operation, its construction is very difficult, construction programs and set up technology undoubtedly face great challenges. Plus bridge located at the Yangtze River area, water depth rapid current, wave height wind. The past, many ships. These girder boat, put cable ship, floating crane in place, stability, suspension and hanging steel box girder