一、前言目前在北京市市政工程桥梁上采用最多的——“U”型金属板内填充料的伸缩缝存在一定的缺点。这种伸缩缝在热胀时混合填充料被挤出,铺装层被拱起,引起跳车。冷缩时被挤出的填充料,不能再平复于伸缩缝中,其缝隙被石子泥土填满,失去伸缩功能。几经寒暑伸缩缝处的桥面及路面铺装层碎裂,必须进行维护。 I. Introduction At present, the most widely adopted bridge on municipal engineering in Beijing - “U” type metal plate filler expansion joints have some shortcomings. This expansion joint in the thermal expansion mixed filler is extruded, paving layer is arched, causing the jump. Lengthening out of the filler, can no longer be smooth in the expansion joints, the gap was filled with gravel soil, loss of telescopic function. After several years of expansion joints and deck pavement cracks, must be maintained.