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1、如何提高铰接空心板桥面的抗病害能力 作者:佚名 文章来源:本站原创 点击数:750 更新时间:2008-8-18【字体:大中小】 一、桥面病害的主要表现 耒宜高速公路是京珠国道主干线湖南境内最南端的一段,于2001年12月正式通车运营。随着本路段运营时间的增长和高密度、重交通以及超载车辆的增加,加重了桥面铺装层的负荷,使得该路段部分桥面出现不同程度的破损。经有关部门检测,并按《公路桥梁养护规范》(JTGH11—2004)进行技术评定。其中7座桥梁的桥面铺装评价指标均为三类。其上部结构型式均为
2、预应力混凝土空心板,跨径为13m、16m、20m。 除主梁结构的工作状态均基本正常外,桥面铺装及其他部位均存在不同程度的病害,主要表现有: 1、桥面坑槽、网裂,露骨、露筋、磨光,桥面现浇层破损,现浇层内钢筋已外露,破损深度最深处达15cmthreethematiceducationandCentralandprovincialimplementationoftheinspectiongroupfeedbackproblemrectificationinaccordancewiththethreeSunsa
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8、overallquality; 2、支座严重偏位、变形、脱空; 3、桥面渗水,铰缝混凝土松散、脱落,纵、横向开裂,顺铰缝出现纵向裂缝,铰缝处渗水严重,桥面雨水沿铰缝下流,造成空心板边钢筋腐蚀,部分铰缝对应地面上有明显水迹; 4、部分空心板顶板厚度不够,混凝土剥落出现裂缝、钢筋保护层混凝土变形开裂脱落露筋、钢筋锈蚀,腐蚀钢筋锈胀,引起砼局部破损; 5、伸缩缝的凸起、