Key Technology of Concrete Maintenance at the Ends of Precast Box Girders of High-speed Railway
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 gird-ers 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 gird-ers 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,simi-lar to the inlet and outlet of ventilation pipes,therefore,it is difficult to maintain them.Combined with the Lin-qing 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.
High-speed railwayPrecast box girderEnds of precast box girdersConcrete maintenanceKey technology
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