钢桥面铺装局部修复方案试验研究

钢桥面铺装的修复技术是钢桥面铺装技术研究的重要组成部分,其复杂性在一定意义上远大于新建大跨径钢箱梁桥的桥面铺装研究。江阴大桥为主跨1385m的钢箱梁悬索桥,钢桥面采用47 mm浇注式沥青混凝土铺装,通车三年多后钢桥面出现大面积破坏。对江阴大桥钢桥面铺装出现的破坏类型以及钢箱梁构造等特点进行研究,在室内试验研究如弯曲试验、拉拔试验、车辙试验、复合梁疲劳试验的基础上,提出了5.0 cm、5.5 cm、6.0 cm不同厚度的双层环氧沥青混合料与“浇注式沥青混合料 环氧沥青混合料”4种结构方案,并利用江阴大桥钢桥面铺装大修的机会,选取代表性梁段作了试验段。研究表明双层环氧沥青混合料性能优于其他方案,此研究为我国钢桥面铺装局部修复方案的确定以及成功实施提供基础依据。

An experimental study on partly patching scheme of steel bridge deck paving

Patching techniques are an important part of steel bridge deck paving.In some sense,the complexity of patching is much greater than paving.We have investigated certain patching techniques applied to the Jiangyin Bridge in China.The Jiangyin Bridge over The Yangtze River is a box-girder suspension bridge with its main span being 1385m and a cast asphalt concrete paving with a thickness of 47mm.After three years of traffic,considerable structural damages on the driveway paving were discovered,such as rutting,transversal shattering,cracking and so on.After an analysis of the structural damages of the pavement and structural characteristics of the box-girder of the bridge together with laboratory tests,such as bending test,pull-out test,rutting test and fatigue test of complex beams,four partly patching schemes of banal-layer epoxy asphalt and"cast asphalt epoxy asphalt"with thicknesses of 5.0cm,5.5cm,6.0cm,respectively,have been tried and evaluated.A representative section of the Jiangyin Bridge is selected for the test,as the steel deck paving is being repaired.The study indicates that the banal-layer epoxy asphalt concrete is superior than other schemes.