Lv J.,Anhui Expressway Holding Group Co. |
Yin Y.,Anhui Expressway Holding Group Co. |
Xiang W.,Anhui Expressway Holding Group Co. |
Wu Y.,The 4th Engineering Co. |
Ding W.,Anhui Expressway Holding Group Co.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015
The design type of middle tower of Maanshan Yangtze River Bridge is steel/concrete hybrid tower. The hybrid part was located in the transition region of steel-concrete structure. The force of steel tower transfers directly to the top surface of the concrete, The adhesiveness between bottom surface of steel tower and top surface of concrete is critical to ensure the structural safety. Concrete mix proportion and construction technology were determined by experimental testing. 1/4 model test was conducted on site to verify the reliability of construction technology. Setting the post pouring concrete hybrid part at 2m distance from steel tower, Using 195cm self-compacting concrete and 5cm high performance mortar solved the concrete pouring problem of hybrid part successfully. Finally, unbonded prestressed were tensioning in steel concrete joint, made the steel pylon and concrete pylon connected seamlessly. ©, 2015, Wuhan University of Technology. All right reserved.
Hu Y.,The 4th Engineering Co. |
Zhang J.-L.,The 4th Engineering Co. |
Yang E.-Y.,The 4th Engineering Co.
Bridge Construction | Year: 2013
The main bridge of the Jiangshun Bridge is a hybrid girder cable-stayed bridge with double pylons, double cable planes and with a main span 700 m. The Pier Z4 of the bridge is supported on the foundation of 28 nos.of φ3.0 m bored piles that are 47.5~72 m long and have the greatest boring depth up to 81.5 m. In the light of the disadvantageous construction conditions of the deep water, shallow overburden, inclined rock surface, very hard rock, non-uniform distribution of rock strata and sandwich at the location of the pier, the bored piles were constructed with the following key technical measures, including those of the geology boring in advance, purposive design and rapid construction of the boring platform, driving of the steel casings by the APE400B single hammer, utilizing of the percussion boring and rotary boring for the piles in different areas and strict control of the slurry indices and boring parameters. The construction of all the piles was finally smoothly completed before the arrival of the flood peak and the inspecting of the piles by the ultrasonic detection proved that the quality of the 28 nos.of the piles could all meet the relevant requirements in the design and codes.