【摘要】 南京四桥为主跨1 418m的三跨连续钢箱梁悬索桥,在国内首次采用复合浇注式沥青钢桥面铺装体系,下层为4cm厚GA-13浇注式沥青混凝土,上层为3.5cm厚AC-13高弹改性沥青混凝土,下层与桥面钢板的粘结层采用溶剂型橡胶沥青。为了解粘结层性能,进行了溶剂型橡胶沥青拉拔试验、剪切试验,结果表明溶剂型橡胶沥青防水粘结层能较好地适应常温条件下的钢桥面铺装抗剥离破坏的要求,但极端低温条件下应验算拉拔强度;粘结层满足抗剪强度要求。为指导粘结层施工,进行钢桥面表面处理工艺试验、粘结层现场施工工艺试验,根据试验成果,提出保证施工质量的针对性措施:钢桥面表面喷砂处理采用Sa3.0级;钢桥面表面处理后直接铺装防水粘结层材料,不再进行传统的表面喷锌或涂锌防护;通过试验研究和试验段施工确定合理的施工控制参数。更多还原

【Abstract】 The Fourth Nanjing Changjiang River Bridge is a three-span continuous steel box girder suspension bridge with a main span of 1 418 m,to which the composite poured asphalt steel deck pavement system has been used for the first time.The lower layer of the pavement is the 4cm thick GA-13 poured asphalt concrete while the upper layer is the 3.5cm thick AC-13high-elastic modified asphalt concrete,and the binding layer between the lower layer and the steel deck plate adopts the solvent rubber asphalt.To investigate the performance of the binding layer,the solvent rubber asphalt was checked by the pull-out test and shear test.The results indicate that the binding layer of solvent rubber asphalt can better meet the anti-debonding damage requirements of the steel bridge deck pavement under constant temperatures,but under the extreme low temperatures,the tensile strength of the binding layer should be checked.The binding layer is proved satisfying the anti-shear requirements.To direct the binding layer construction,the testing of the surface handling technique for the steel bridge deck and that of the field construction technique of the binding layer were carried out.According to the test results,the targeted measures taken for ensuring the construction quality were proposed.The sandblasting of the steel bridge deck was set at Sa3.0.After the sandblasting of the steel bridge deck,the waterproof binding layer was directly paved and there was no need to do the traditional zinc spraying or painting protection.The rational construction control parameters were determined through experimental study and trial section construction.更多还原