Nanjing, China
Nanjing, China

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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.

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.

Pan W.-D.,South China University of Technology | Chen J.-G.,South China University of Technology | Ou W.-J.,The 4th Engineering Co.
Electronic Journal of Geotechnical Engineering | Year: 2016

In order to study the influence of the deformation and stress of the existing tunnel structure under different distance and cross angles, the actual project in Fuzhou city was taken to analyze. The finite element analysis software was used to construct the three-dimensional finite element model for numerical calculation, and obtained a variation curves of vertical displacement and stress at different distances and angles. Numerical results show that: (1) When the distance is 1.5 times less than the diameter of the new tunnel, the maximum vertical deformation of the existing tunnel occurs at the intersection of the two tunnels. When the distance is 1.5 times more than the diameter of the new tunnel, the maximum deformation of the existing tunnel is gradually moving toward the center of the existing tunnel. (2) The influence of the first principal stress and the deformation of the existing tunnel is mainly affected by the distance, and the cross angle has little effect. May the research results can provide some reference for the design and construction of similar projects. © 2016 ejge.

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