The infrastructure miracle that shocked the world - China's Dafaqu Bridge震撼世界的基建奇蹟-中國大發渠特大橋 скачать в хорошем качестве

The infrastructure miracle that shocked the world - China's Dafaqu Bridge震撼世界的基建奇蹟-中國大發渠特大橋

The Dafa Canal Bridge is 1,427 meters long, 33 meters wide and 280 meters high. The main bridge spans 410 meters and is a concrete-filled steel tube arch bridge. It is a control project of Renzun Expressway. The maximum lifting weight of its main arch is 240 tons, The entire bridge weighs more than the world's largest span Concrete-filled steel tube arch bridge, At present, it is the first bridge of the same type that has been built. The Dafa Canal Bridge is located in a dangerous part of the canyon, The terrain on both sides is steep, with a relative height difference of about 500 meters, Wujiang Guanyinsi River Zunyi bank slope is more than 70 degrees. At the beginning of the design, the design team selected a variety of bridge schemes, Finally, concrete-filled steel tube arch bridge was adopted according to local conditions. The bright red arches of the bridge span the green mountains and the green waters, Like a dragon at sea, perfectly integrated with the surrounding environment. In addition, the construction conditions at the bridge site are complicated, The arch seat area is heavy in mud, extremely soft rock, Argillaceous cement breccia that softenes easily when exposed to water. "In order to solve this geological challenge, the design team has continuously optimized the solution, The final arch design uses an expanded foundation vertical pile + inclined pile composite foundation type, A variety of measures to ensure the safety of the bridge, It is a complex geological condition in mountainous area The construction of arch bridge provides a scheme for reference. Dafa Canal super large bridge is designed as a two-way six-lane bridge with a width of 33 meters. Is the widest bridge of its kind in the world, The design of the 240-ton main arch head segment And hoisting is the most important link in bridge construction. Due to the terrain, Zunyi bank can not set up cable tower. In response, the design team creatively designed Large tonnage non-tower cable anchoring transversal lifting system, The site layout is easier, the force is safer, and the duration is shorter. Dafa Canal large bridge main bridge The bottom structure is concrete-filled steel tube with variable section arch, The upper structure is a steel composite beam. The left width of the bridge span arrangement is (15×40.1m+7×40m) (Prestressed concrete simple support before structural continuous T beam) +410m(concrete-filled steel tube truss arch bridge) +3×40m, the right width is (4×39.8+9×39.9m+8×40m) (Prestressed concrete simple support before structural continuous T beam) +410m(concrete-filled steel tube truss arch bridge) +3 x 40m. Calculate span 410m, arch axis coefficient m=1.54, The vector height is 88m, the vector span ratio is 1/4.659, and the arch axis is catenary. The bridge used about 150,000 square meters of concrete, The steel bar is about 21,000 tons, and the project cost is 590 million yuan.