摘要
为解决西陵长江大桥钢桥面沥青铺装大修中遇到的工程技术难题,对设计控制指标、设计计算方法、试验检测方法、旧桥面清除方法等进行了研究。在对西陵长江大桥旧桥面铺装病害调查、沥青铺装体系力学模型计算、极限低温调查的基础上,采用铺装表面弯拉应变与铺装——钢板界面剪应力作为铺装材料疲劳设计控制指标,提出长寿命防水粘结层设计,并提出实用的试验检测方法与指标。在沥青铺装现场温度测试的基础上,建议提高沥青混合料车辙试验的温度标准与动稳定度指标。在对旧桥面铺装材料与结构分析的基础上,提出旧桥面清除方案。在对旧钢板抛丸除锈试验段基础上,解决清洁度与粗糙度指标之间的矛盾。研究结果表明:旧铺装机械清除以保护钢板为主,半桥施工应考虑配重、安全防护、环境保护;两遍抛丸除锈采用不同粒径钢丸可解决清洁度与粗糙度的矛盾;多跨连续叠层梁模型计算的铺装表面弯拉应变与界面剪应力作为疲劳设计指标基本可行;采用抗拉强度结构系数提高极限低温下的沥青混合料弯拉应变技术要求是可行的;铺装高温稳定性设计应提高温度标准,动稳定度指标可根据设计交通量确定。
In order to solve the problems in asphalt pavement major repairs of Xiling Yangtze River Bridge,its design indexes,calculation method,detection method,and pavement removal method were analyzed.Based on the disease investigation,mechanical model calculation and lowest temperature investigation,flexural-tensile strain in pavement surface and shear stress in interface between steel deck and pavement were used as fatigue design control indexes,the long life design for waterproof-cohesive layer was put forward,and the detection methods and indexes were determined.The standard temperature used in rutting test and qualification standard of dynamic stability were suggested to be raised which being revealed from field temperature test.Based on analysis of original pavement materials and structure,the removal scheme was put forward.The contradiction between cleanliness and roughness was solved by test section of sand blast.It is concluded that（1） the first important problem for removal is steel deck protection,and balance weight,safety measures and environmental protection must be considered when overhaul in half-width;（2） the contradiction between cleanliness and roughness can be solved by twice sand blast using different sized steel shots;（3） surface flexural-tensile strain and interface shear stress being got by multi-span continuous laminated beam model can be used as the fatigue design indexes;（4） the flexural-tensile strain index in low temperature can be improved by tensile strength structure coefficient;（5） the temperature criterion that being used in pavement high temperature stability design must be increased,and the dynamic stability index can be got by design equivalent standard axles.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第5期52-61,82,共11页
Journal of Highway and Transportation Research and Development
基金
湖南省自然科学基金项目(10JJ3009)
道路结构与材料交通重点实验室(长沙)开放基金项目(kfj080204)
关键词
桥梁工程
关键技术
大修
沥青铺装
设计方法
桥面清除
bridge engineering
key technology
overhaul
asphalt pavement
design method
pavement removal
