Study On The Construction Quality Control Of The Superstructure Of Three-tower Suspension Bridge

For kilometer-sized three-tower suspension bridge，there is no successful precedent inthe world，no experience to follow.It is important to place emphasis on the constructionquality control，In order to ensure the quality of construction of the bridge. In this paper，thestudy of the construction quality control of the superstructure of three-tower suspensionbridge is doing on the basis of construction quality control of the the two-tower suspensionbridge.For the design of herringbone steel tower and two cross-kilometer-sized span，thedesirability of the cantilever gantry lifting systems，four-span continuous Catwalk，the sharesstructure of91winding ropes，the program of lifting the steel box girder from the mid-spanSymmetrically is discussed as the background of Taizhou Bridge. A set of measures of theconstruction quality control of the key processes of the superstructure is proposed to ensurethe safety and accuracy of the construction，which is based on the two-tower suspensionbridge.It is proved that measures of the construction quality control of the three-tower suspensionbridge superstructure are effective and reliable， through real-time monitoring of thesuperstructure construction. And the monitoring data shows that the deviation of the top of thetower is larger during the lifting of the steel box girder, changes Obviously during the weldingof steel box girder，which is affected by the temporary load of the deck，but without theexceed of the allowable range of monitoring. The north displacement of the south anchorsaddles, the south displacement of the north anchor saddles, mainly occurs in the stage of steelbox girder welding, and the horizontal displacement is consistent with the settlemen basically.Meanwhile, there is a certain lag between the load of main cable, the load of steel box girderand the anchor deviation.Quality control of the three-tower suspension bridge lack of experience,and is morecomplex, further research is needed in the future construction quality control.