Key Construction Technologies of Concrete Box Girder in Alpine Region

In the harsh natural environment of high altitude and cold regions, in order to improve the strength and frost resistance durability of concrete box girder, it is necessary to propose key technologies of concrete box girder construction. Firstly, water reducing agent and air entraining agent are added respectively. The effects of different admixtures on the properties of alpine-cold concrete are analyzed through experiments, and the optimal mix proportion of concrete box girder in high altitude and cold area is determined. Then, according to the specifications and combined with the situation of the high-altitude area where the project is located, the construction key technologies such as the temperature of concrete raw materials entering the warehouse, the heat preservation and temperature control of the box girder pouring process, the fabrication of prefabricated box girder and steam curing measures are proposed. Finally, the box girder strength was tested on site by the rebound method, and the effectiveness of the optimization scheme was verified. The research results of this paper can provide reference and guidance for similar projects.