Construction of "three-dimensional municipal comprehensive pipe gallery" demonstration project by Jiamin elevated line open to traffic

Release time：2018-01-12 16:31Number of visits：154times

 The southern section of the Jiamin viaduct, designed by the Municipal General Hospital, is an important longitudinal section of the high-speed system proposed in the "deepening plan for the backbone road network of Shanghai" , which runs through the four major new cities in the West from south to north, namely, Jiading District, Qingpu District, Songjiang District and Minhang District, it is also the "one vertical" in the "one vertical and three horizontal" expressway network system of Hongqiao Hub road network supporting project. The implementation of this project is of great significance to the improvement of the expressway system of the western new town, the construction of a complete traffic diversion channel of Hongqiao Junction, and the alleviation of traffic congestion in the West Section of S20 and the West Section of S4 Minhang District, can also be built with the S32 joint responsibility for the two major airports of the rapid communication channel. The main line of Jiamin viaduct N2 is an urban expressway, with a total length of 6.9 km and two-way six to eight lanes, with a design speed of 80 km / h. The surface roads are sub-trunk roads with a total length of 9.0 km and two-way two to four lanes, with a design speed of 40-80 km / h, it is also used as overhead, power maintenance channel and flood control channel. Building "three-dimensional municipal comprehensive corridor" demonstration project. The project shares a composite corridor with Shanghai-hangzhou high-speed railway, Shanghai–Hangzhou Railway, planned magnetic levitation, high-voltage power line, river course and industrial heat pipe corridor, after more than a dozen rounds of communication and demonstration with railway, power, water and other departments, breaking through conventional thinking, through reasonable line selection, horizontal and vertical combination, three-dimensional design, and on the premise of meeting their own operating safety requirements, three-dimensional compact layout in 100 meters wide corridor belt, compared with the conventional layout of land saving 900 acres. At the same time, the ground roads have combined many functions, such as the express transportation distribution road, the overhead maintenance road, the power tower maintenance road, the river flood control channel, etc. , to promote the intensive layout of municipal infrastructure has a good demonstration effect on similar projects in the future. Innovating technology to improve engineering quality. The construction of Jia-min viaduct brings together many new technologies, new techniques, new materials and new equipment. Some viaducts'substructures, such as bearing caps, columns and capping beams, are assembled with precast structural segments to solve the problem of limited construction sites in dense urban areas and reduce the impact of traffic during construction, at the same time, the construction speed of viaduct around sensitive building is increased. UHPC is applied in a large number of pilot projects, such as the connection between the column of the Ramp Bridge on Yuanjiang Road, the wet joint of the small concrete box girder on the upper part of the lower ramp on Yuanjiang road, the steel-concrete composite beam deck of the main line viaduct over Yindu road, and the upper beam of yuanjiahe bridge on the ground. Especially, the superstructure of yuanjiahe ground bridge is composed of UHPC-RC composite beam, that is, UHPC precast beam and ordinary reinforced concrete slab (RC) deck, which is the first UHPC-RC composite bridge in beam bridge. The application of ultra-high performance concrete (UHPC) can effectively reduce the self-weight of the bridge superstructure, optimize the construction quantity of the bridge substructure, at the same time, reduce the field operation quantity and speed up the construction progress.