Precasting And Installation Of The Double-Track Simply Supported Monolithic Box Beams Of High-Speed Railroad

The maximum speed of high-speed railroad in China will reach 200 km/h, the rail on bridge is required to be very straight and steady so as to safely run a train and provide comfort for passengers. A beam as the base of rail must have strong strength, rigidity, small subsequent creep camber, and excellent durability as well as rapid in const ruction. So post-tensioned pre-stressed concrete box beams are widely used and precast in situ. Precast box beams are installed by bridge erectors. Precast box beams are rarely large-scale used in railway bridge construction in China. So we are lack of experience in doing large-scale precasting. With the expounding of design and make of double track box beam molds (span: 24 m), pouring, vibrating of concrete, temperature of heat of hydration, pre-stressing method, result of concrete stress, as well as quantity control method, and installation of double-track simply supported and monolithic box beams, we provided the proven experience for large scale use of prestressed concrete simply-supported beams in high-speed rail road in China.