In a joint venture with Chongqing Communications Research and Design Institute, TYLin provided design services for the Guojiatuo Bridge, a significant element of the “Yangtze River Six-Crossing System” in Chongqing, China.
TYLin’s design for the Guojiatuo Bridge creates a double-deck system. The upper deck carries eight lanes of vehicular traffic, four in each direction. The lower deck will have two lanes of transit tracks for the future No. 8 Metro Line across the Yangtze River.
Opening in late 2022, the Guojiatuo Bridge will shorten the travel time between the Liangjiang New Area to Chongqing’s Nan’an District from 40 minutes to about 10 minutes. Other benefits include significantly improving connectivity to the city’s downtown areas and contributing to future economic development.
The Guojiatuo Bridge is a 1,403.8 -meter-long suspension bridge with two towers and three spans of continuous steel truss girders (75 meters, 720-meter main span, and 75 meters) and a 39-meter-wide deck. Due to hydraulic conditions and navigational requirements, only the main span is carried by suspenders from the suspension cables.
The bridge superstructure was designed as an isotropic deck with a triangular-shaped steel truss girder. The superstructure for the north and south approaches are trapezoid-shaped double-box double-cell, continuous prestressed concrete box girders.
The approaches consist of four 43-meter-long segments on the north side and seven 43-meter-long segments on the south side. The frames also have saddles on top of the towers.
- The main truss is 12.7 meters tall, 15 meters long per segment, and 17 meters wide, center-to-center.
- Based on site conditions, the anchorages on either side of the bridge are gravity anchorages.
- The south and north towers measure 161.9 meters tall and 172.9 meters tall, respectively.
- The bridge towers are portal frames, with upper and lower pylons, connected by crossbeams at the top, middle, and bottom.
- The pile caps are 69.6 meters long and 6 meters high, supported by 34 3-meter-diameter bored piles.