一、前 言 桥梁的伸缩缝,与所处道路的性质及梁的伸缩量相适应,最好应在考虑其耐久、行车、防水、施工、维修、经济等性能的情况下。通过综合分析认为最适当的型式来选定。所谓道路的性质是指此道路的服务等级、交通量的多少、重车的比率及环境条件等。在高速公路,国道及主要 First, the foreword Bridge expansion joints, and the nature of the road and the amount of expansion and contraction of the beam to adapt, it is best should consider its durability, traffic, water, construction, maintenance, and economic performance under the circumstances. By comprehensive analysis that the most appropriate type to be selected. The so-called nature of the road refers to the level of service of this road, the amount of traffic, the ratio of heavy vehicles and environmental conditions. On the freeway, state road and main