高速铁路预制箱梁梁端混凝土养护关键技术  

Key Technology of Concrete Maintenance at the Ends of Precast Box Girders of High-speed Railway

作　　者：邓杰 DENG Jie(Sinohydro Bureau 5 Co.,Ltd.,Chengdu Sichuan 610066)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066

出　　处：《四川水力发电》2024年第S02期39-43,共5页Sichuan Hydropower

摘　　要：随着高速铁路的快速发展,预制箱梁因其具有的高经济性以及良好的稳定性得到了快速、广泛地使用。预制箱梁的生产过程主要包括底模制作、模板制作、浇筑混凝土、张拉压浆、梁体养护等,其中梁体混凝土的养护是一道关系到预制箱梁结构稳定性和耐久性的重要工序。对于梁体混凝土,一定要做到全方位的湿润养护、温度控制以确保混凝土箱梁具有良好的使用寿命;由于高速铁路梁端布置有预应力孔道、预应力筋且处于类似通风管进出口的原因,导致梁端混凝土养护一直是梁体养护的重难点问题。结合临清制梁场的实际工况,探讨了时速为350 km的高铁预制无砟轨道后张法预应力混凝土简支箱梁(双线)梁端混凝土养护关键技术。With the rapid development of high-speed railways,prefabricated box girders have been rapidly and widely used because of their high economy and good stability.The production process of the precast box girders mainly includes the making of the bottom mold,the making of the formwork,the pouring of the concrete,the stretching and grouting,the maintenance of the box girders,etc.The maintenance of concrete of box girders is an important process which is related to the stability and durability of precast beam structure.In order to ensure the good service life of the concrete box girders,all-round wetting maintenance and temperature control should be carried out.Pre-stressed holes and pre-stressed bars are arranged at the end of the box girders,similar to the inlet and outlet of ventilation pipes,therefore,it is difficult to maintain them.Combined with the Linqing Beam manufacturing site,this paper discusses the key technology of concrete maintenance at the ends of simple-supported box girders(double-track)of post-tensioning prestressed concrete for precast ballastless track of 350km per hour high-speed railway.

关 键 词：高速铁路 预制箱梁 梁端 混凝土养护 关键技术 

分 类 号：U215[交通运输工程—道路与铁道工程] U215.1U215.7