The picture shows the Shanghai Yangtze River Bridge
Previously, after 5 years, China completed a world-class project and built a super bridge in Shanghai, but some netizens expressed doubts, the so-called difficulty is difficult in what aspects? Some netizens also want to know what difficulties this very bold design super bridge has encountered in the construction and design process, and in the end, how to overcome it?
Known as the first bridge at the gateway of the Yangtze River, the Shanghai Yangtze River Bridge is a cross-sea bridge in Chongming District, Shanghai, China, located above the mouth of the Yangtze River, one of the important components of the Chongming River Crossing Channel in Shanghai, which began construction on December 28, 2004 and opened to traffic on October 31, 2009, with a total length of 5 years, a total length of 16.63 kilometers, and a length of 9.97 kilometers across the river.
The picture shows the construction site
Although it looks imposing, amazing, but the difficulty of the construction of the bridge, but enough to make people prohibitive, Shanghai Bridge is located at the mouth of the Yangtze River, hydro-meteorological conditions are very poor, accompanied by it, but also greatly improve the difficulty of construction, because it is located on the seashore, here every year will be affected by typhoons, not only that, in the daily construction process, wind and waves also have a great impact on daily construction, if because of natural environmental interference, there is an error in the construction, then the construction progress of the project will have a huge impact, But the bridge has to be built, so what to do? At this time, the construction personnel responsible for the construction of the bridge pioneered a way, that is, the pier body, phase beams and other large components, first complete the production on land, and then assemble on the water, complete the entire construction process, rather than always working on the water, so that the natural environment such as sea conditions and weather can be minimized, the adverse impact on the construction, at the same time, prefabrication on land also has a great advantage, the various parts of the bridge can be carried out synchronously, without pressing the progress, At the same time, the number of piers can be reduced, that is, the cost is reduced, and the bridge is more aesthetically designed.
In addition to construction, water handling is also a great difficulty, the main tower of the Shanghai Yangtze River Bridge in the design of the herringbone, its main tower up to 212 meters, matched with up to 730 meters of full floating system steel beam, and a 105 meters long steel beam weight of 2300 tons, but also from 90 nautical miles away from the production site to carry over, and then, accurately erected to the Yangtze River Bridge pier, the difficulty, can be imagined.
The picture shows the handling site
After overcoming the problem of handling, there is a new breakthrough in the construction of the Yangtze River Bridge. The bridge has a 4.46 km long surface road at the junction with the Chongqi Expressway, which requires about 600,000 cubic meters of soil to build a foundation for the road, but for coastal cities, the lack of soil resources, there is not enough soil to build a foundation for the road, just when everyone is worried, at this time, the idea of building a road with fine sand is amazing, but in practical application, it is found that the adhesion of sand is not enough, can not be used as a foundation material, so the technicians conducted three months of tests before the official laying, Adding different mixed materials in the fine sand, and using the method of layered filling, layered compaction, and finally, mastering the best compaction degree and the best water content control method of sand filling paving, this bold idea, difficult experiment, so that the fine sand that has been forgotten for thousands of years, in this 4.46 km road, blooms, which also creates a precedent for the large-scale use of fine sand to build roads in China in the future, and provides valuable experience for coastal cities to build bridges and pave roads.
The picture shows the laying of beam plates
When building the bridge, the bridge adopts an S-shaped linear arrangement, this design on the one hand makes the bridge beautiful, on the other hand, it can minimize the impact on the water flow under the bridge, thereby reducing the damage to the ecology, to meet the demand for environmental protection, in addition, the integration of the Yangtze River Bridge and the surrounding natural ecology not only meets the vision of Shanghainese who have crossed the Yangtze River for thousands of years to reach the other side, but also makes it here, known as the back garden of Shanghai City, to come here, can not see the high-rise buildings, can not see the noise of the city, Some are a blue sky, a calm sea, so peaceful, quiet, it is the unity of nature and man, China's infrastructure construction, the ecological environment of the protection, to create today's beauty, which also proves that china will be more prosperous in the future.