With the economic growth of our country more and more highways have come into service .For some mountain highways ,due to the constraints of terrain conditions such as large longitudinal slope ,complex layout and regional micro-climate impacts .In recent years the bridges in mountainous areas of our country have appeared problems such as the slip of the beam ,the expansion joints malfunction and the uplift of the bridge deck .Based on a bridge in a highway inter-change line leading to the bridge expansion joint extrusion malfunction , combined with the construction quality , this problem was analyzed ,and the problems are proposed according to the recommendations of the maintenance treatment .It is instructive for the design ,construction and maintenance of interchange bridge in mountainous expressway .%随着我国经济的增长,越来越多的高速公路相继建成通车.特别是一些山区高速公路,由于受到地势条件的限制,多呈纵坡大、展线复杂、区域小气候影响大.近年来,我国山区高速公路互通桥梁相继出现梁体滑移导致伸缩缝挤死,造成桥面出现隆起现象,严重影响行车安全.通过对某高速公路某座互通主线桥伸缩缝挤死导致桥面隆起的现象进行了深入调查,结合施工质量、设计理念对病害产生的原因进行了分析研究,并对病害提出了针对性的维修处治建议.为山区高速公路互通立交桥梁的设计、施工、养护工作有一定的指导意义.
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