Key Accelerated Construction Techniques of CRTSⅢ Ballastless Tracks of Long-Span Hybrid Girder Cable-Stayed Bridge
This paper presents an accelerated construction scheme for the CRTS Ⅲ ballastless tracks of long-span railway bridge.The main bridge of Fuchunjiang River Bridge of the Huzhou-Hangzhou Railway,which is a hybrid girder cable-stayed bridge that has two concrete pylons of different heights and is arranged in spans of 30,46,300,97,and 62.395 m,is used for a case study.During the construction process,the influences of temperature and deck loads on the alignment of the deck are taken into account.Considering that the control points of CP Ⅲ need multiple measurements in the construction process and the alignment control method governs the construction schedule,it is proposed to bury survey nails on the two sides of the deck corresponding to each base plate layout section as the observation points,with the elevation difference between the observation points and layout points serving as the control indicator.The stiffness of the finite element model was upgraded with the deck alignment data measured before and after the construction of auxiliary facilities,such as crash barriers.In accordance with the configuration of the CRTSⅢ ballastless track,the precamber of the superstructure was calculated in the upgraded finite element model to control the alignment.By using the presented construction scheme,the construction of the main bridge of the Fuchunjiang River Bridge was shortened by 20 days,with the required construction quality and improved construction efficiency.
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