世界桥梁
世界橋樑
세계교량
WORLD BRIDGE
2014年
4期
44-48
,共5页
悬索桥%钢箱梁%钢桥面铺装%防水粘结层%溶剂型橡胶沥青%表面处理%试验%施工
懸索橋%鋼箱樑%鋼橋麵鋪裝%防水粘結層%溶劑型橡膠瀝青%錶麵處理%試驗%施工
현색교%강상량%강교면포장%방수점결층%용제형상효력청%표면처리%시험%시공
suspension bridge%steel box girder%steel bridge deck pavement%waterproof bind-ing layer%solvent rubber asphalt%surface handling%test%construction
南京四桥为主跨1418 m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4 cm厚GA -13浇注式沥青混凝土，上层为3．5 cm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S a3．0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。
南京四橋為主跨1418 m的三跨連續鋼箱樑懸索橋，在國內首次採用複閤澆註式瀝青鋼橋麵鋪裝體繫，下層為4 cm厚GA -13澆註式瀝青混凝土，上層為3．5 cm厚AC -13高彈改性瀝青混凝土，下層與橋麵鋼闆的粘結層採用溶劑型橡膠瀝青。為瞭解粘結層性能，進行瞭溶劑型橡膠瀝青拉拔試驗、剪切試驗，結果錶明溶劑型橡膠瀝青防水粘結層能較好地適應常溫條件下的鋼橋麵鋪裝抗剝離破壞的要求，但極耑低溫條件下應驗算拉拔彊度；粘結層滿足抗剪彊度要求。為指導粘結層施工，進行鋼橋麵錶麵處理工藝試驗、粘結層現場施工工藝試驗，根據試驗成果，提齣保證施工質量的針對性措施：鋼橋麵錶麵噴砂處理採用S a3．0級；鋼橋麵錶麵處理後直接鋪裝防水粘結層材料，不再進行傳統的錶麵噴鋅或塗鋅防護；通過試驗研究和試驗段施工確定閤理的施工控製參數。
남경사교위주과1418 m적삼과련속강상량현색교，재국내수차채용복합요주식력청강교면포장체계，하층위4 cm후GA -13요주식력청혼응토，상층위3．5 cm후AC -13고탄개성력청혼응토，하층여교면강판적점결층채용용제형상효력청。위료해점결층성능，진행료용제형상효력청랍발시험、전절시험，결과표명용제형상효력청방수점결층능교호지괄응상온조건하적강교면포장항박리파배적요구，단겁단저온조건하응험산랍발강도；점결층만족항전강도요구。위지도점결층시공，진행강교면표면처리공예시험、점결층현장시공공예시험，근거시험성과，제출보증시공질량적침대성조시：강교면표면분사처리채용S a3．0급；강교면표면처리후직접포장방수점결층재료，불재진행전통적표면분자혹도자방호；통과시험연구화시험단시공학정합리적시공공제삼수。
T he 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 4 cm thick GA-13 poured asphalt concrete w hile the upper layer is the 3 .5 cm thick AC-13 high-elastic modified asphalt concrete ,and the binding layer between the lower layer and the steel deck plate a-dopts 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 bind-ing 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 bind-ing 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 con-struction .
