About the author:

China Communications 2nd Navigational Bureau 2nd Engineering Co.,Ltd., Chongqing 401120, China

Abstract:

After the single strand hanging and initial tensioning of the steel strand cables of a cable-stayedbridge are completed, there is often a situation where the anchor clips of group anchorage do not haveenough retreat distance during the overall tensioning in the secondary tensioning,which can scratch theanti-corrosion coating. During the completion of the second tensioning,when the steel strand retracts,there is often a situation where the two-leaf working anchor clips can not retract synchronously or evenbecome misaligned. This leads to a sudden decrease in the anchoring performance of the steel strandcables under low stress, posing a significant safety hazard to the bridge. Taking the cable construction ofthe Rongshan Yangtze River Bridge in Luzhou, Sichuan Province as an example, this paper introduces anew type of hydraulic device that can collectively advance the anchor clips of the steel strand cables. Thisdevice is installed between the limit plate and the collective tensioning jack. Its lifting piston can drivethe entire front pressing head assembly to move forward. The pressing head assembly is a hollow tubestructure. After it passes through the eye hole of the limit plate, it can push the working anchor clips intothe working anchor cone hole as a whole, effectively resolving the aforementioned anchoring safetyhazards.