沪宁高速公路扩建工程中,为保证新拼宽的桥梁能与老桥共同受力,减少混凝土发生收缩徐变产生裂缝,减少结构整体的附加内力,设计新老、桥梁板纵向拼接拼接缝采用UEA混凝土浇注。文章结合参建的沪宁高速公路扩建工程新、老桥梁的拼接,详细介绍UEA混凝土控制裂缝的原理、配合比的确定、施工工艺及施工中的注意事项。 Shanghai-Nanjing Expressway expansion project, in order to ensure that the new Pope wide bridge with the old bridge together to reduce the occurrence of concrete shrinkage creep cracks, reducing the overall structure of the additional internal forces, the design of old and new, vertical splice splice plate UEA concrete pouring. This article combines the splicing of new and old bridges of the Shanghai-Nanjing Expressway expansion project, details the principle of UEA concrete crack control, the determination of mix proportion, construction technology and precautions in construction.