Key Technologies for Segmented Installation of Large Cantilever Prefabricated Cap Beams
Prefabricated assembly process is adopted in the construction of main overhead section of S3 Highway project(Bid section-3).By taking into account the components transportation and on-site lifting capacity,the standard section of capping beam is divided into 2 segments,with 2m long wet joint reserved in the middle,overall pouring process shall be done after respective installation,The center of gravity is not directly above the column during the installation of segmented capping beam with large cantilever.The eccentricity of the segmented capping beam requires the use of temporary measures which can effectively reduce the risks in safety and quality resulting from the sinking of long cantilever of capping beam.In addition,two conventional measures,namely,support method and anti-pull method are put into practice,analyzed from the aspects of construction difficulty and stress characteristics.The results show that the above two adapt to different situations based on the respective advantages and disadvantages.
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