文档介绍：武汉白沙洲大桥南岸水中墩基础施工
摘要: 武汉市白沙洲大桥正桥是一座双塔钢箱梁斜拉桥,南侧正桥为T梁简支结构,其南岸水中墩基础采用钻孔灌注桩。介绍了水中墩基础施工时施工栈桥、钻孔平台的方案选择及施工,同时介绍了钻孔和围堰的施工方法。实践证明,该施工方法经济实用。
关键词: 长江大桥;桩基础;栈桥;钻孔;围堰;施工方法
中图分类号: 文献标识码: A 文章编号: 1003-4722(1999)02-0055-03
Construction of the Pier Foundation
in the South of the Wuhan Baishazhou Bridge
XIAO Jia-peng
(The 1st Bridge Construction Division,Major Bridge Engineering Bureau,Ministry of Railways,Wuhan 430065,China)
Abstract: The main bridge of Wuhan Baishazhou Bridge is a steel box girder cable-stayed bridge with double structure in the south of the bridge is a simple supported T beam bridge,its pile foundations are plan selection and construction of construction trestle bridge and bored platform were introduced,and the construction methods of borehole and cofferdam were also practice,it was shown the construction methods were practical and economic.
Key words: Changjiang bridge;pile foundation;trestle bridge;borehole;cofferdam;construction method
1 工程概况
武汉白沙洲大桥位于武汉长江大桥上游约10 km处,北跨汉阳南接武昌,是武汉市中环线的枢纽工程。该桥正桥2 460 m,为主跨618 m的双塔钢箱梁斜拉桥。南侧正桥940 m为18×50 m+40 m T梁简支结构。6个水中墩处于白沙洲段的南汊,长年有水,水深在6~22 m之间,河床的覆盖层较深,在30~40 m之间,地质柱状图表明覆盖层为砂卵石层,粉细粗中砂层层厚均在4~8 m之间,岩层为砂质泥岩,岩石的单轴抗压强度为30 MPa。本文重点介绍了保证工程顺利进行所采用的比较经济实用的施工方法。
2 施工栈桥
方案选择
根据以往的施工经验,水上施工既可采用导向船作水中浮动平台,利用拖轮、驳船、浮吊进行施工;也可采用施工栈桥变水为岸的施工方案。经过充分考虑认为前者使用的机械设备多、工作面少、工期长、阻水面积大、施工比