目前,在寒冷地区修建公路立交桥,均在夏季施工,当年开工当年竣工。但是较大的公路立交桥或年内开工较晚不能在当年竣工,就必须跨年施工,而且跨年工程大部分是立交桥上部结构。为了浇注上部主梁混凝土,地面支模基础就必须进行处理,如在原路面上支模可做局部基础处理,如无原路面就必须专门进行地基基础处理。国内一般做结构层,使其具有足够的使用强度,为在初 At present, construction of highway overpass bridges in cold regions is carried out in the summer and was completed the same year. However, if a large highway overpass cannot be completed later in the year or if it is completed later in the year, it must be constructed in multiple years. In addition, most of the over-year projects are superstructures of overpasses. In order to cast the upper main girder concrete, the foundation of the ground support mold must be treated. For example, the base mold can be partially treated on the original road surface. If there is no original road surface, the base foundation treatment must be carried out. The general structure of the domestic level, so that it has sufficient intensity of use, for the beginning