The Pinglu Canal Jiuzhou Grand Bridge is located near Jiuzhou Town, Qinzhou City.The main bridge is a steel tube concrete through tied-arch bridge with a span of 260m and a total width of 34.8m.
The arch ribs of the main bridge are divided into three parts for construction: side sections, middle sections and closure sections. The arch rib adopts low-position assembly + portal tower overall lifting construction technology. The low-position assembly span of the arch rib is 209.44m, the overall lifting weight is 1800t, and the lifting height is 63m.
Such an overall lifting process for arch ribs with long span, heavy weight and high lift is rare in the same type of steel tube concrete construction in China.
This project is the in-situ overall lifting and construction of the steel tube arch middle arch. In order to achieve intelligent overall lifting, ultrasonic ranging and laser ranging methods are used to ensure the overall lifting accuracy. The lifting process also requires the installation of three tie rods: temporary tie rods for arch ribs, temporary tie rods for abutments and permanent tie rods.
The overall lifting and tie rod installation of this project were undertaken by, Liuzhou Guiqiao Cable Co., Ltd.
Eight 350-ton lifting jacks are used for lifting, each of which is installed on the lifting steel tower with 19-Ф17.8 steel strands to lift the 1800t mid-arch rib.
The XG15-25 arch rib temporary tie cable, the XG15-37 arch base temporary tie cable and the XG15-31 permanent tie cable adopt 8 sets of 650t intelligent tensioning jacks with limiters and anti-loosening devices for single-end or double-end tensioning rod rope.
On September 20, the overall lifting of the arch rib of Pinglu Canal Jiuzhou Large Bridge was completed, and it is currently the world's largest arch rib overall lifting span and tonnage of concrete-filled steel tube arch bridge.
This is the most critical node of the main bridge project of Pinglu Canal Jiuzhou Large Bridge, and it is the process with the highest technical difficulties and the greatest construction risk. The successful completion of this node lays a solid foundation for the project to be completed on schedule.