Geological Fault Cross-sea Bridge

- Aug 07, 2019-

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The first bridge in China that spans the seismic activity fault—Hainan Haiwen Bridge (formerly known as Paiqian Bridge) was completed and opened to traffic (pictured, this newspaper's data map), and the main bridge of the bridge was built at the E2 Central Enterprise in the South China Land. Shows Hubei wisdom and Hubei power.


The Haiwen Bridge, located at the northeastern tip of Hainan Island, connecting Haikou and Wenchang, is the longest-running bridge with the highest pylon in Hainan Province. The total length of the bridge is about 5.6 kilometers, and the main tower of Wenzi is 151.8 meters high. . CCCC II has built a 3.9-kilometer-long main bridge, which has set a new record in the history of bridge construction in China: the highest seismic fortification intensity and the highest wind resistance level. The first cross-sea bridge spanning the active fault, the first PMC (project management contracting) For the first time, the model construction is based on the three-dimensional adjustable cross-fault bridge system and the continuous structural system of simply supported steel box girder bridges across the fault. The steel pipe composite pile foundation is the largest.


Previously, there were only three cross-seismic bridges built in the world - the Akashi Kaikyo Bridge in Japan, the Oakland Bay Bridge in San Francisco, and the Ryan Bridge in Greece. The Haiwen Bridge has an anti-seismic cracking degree of 8 degrees and a basic wind speed of 49.5 meters per second, which is resistant to 17 winds.


According to reports, a 7.5-magnitude earthquake occurred at the Haiwen Bridge site, which is a potential source area. Due to planning and terrain conditions, the bridge site cannot effectively avoid faults. Since the establishment of the bridge in 2009, after six years of survey and research, the bridge structure design uses a unique "fuse" mechanism to resist possible strong earthquakes. In the direction of the Haikou direction, some of the beam bodies are replaced by girders. Once an earthquake occurs, The trabecular beam is destroyed and can be replaced with a spare beam in time to ensure the safety of the main bridge, similar to a fuse in a home circuit.


According to the introduction, in view of the seismic fault zone of the bridge and the strong typhoon, two split-type caps are arranged under the main pier. Under each cap, there are 16 steel pipe composite piles with a diameter of 4.3 m and a length of 38 m. The 12-story high-rise building with an area of about 300 square meters is plunged into the sea floor to improve the seismic strength.