On the 21st, the steel truss girder of the Guyumen Channel Bridge of the Pingtan Strait Gongtie Bridge was provided for hoisting/Xinhua News Agency.
With a 17-meter-long, 473-ton steel truss beam accurately fixed in place, the 16.34-kilometer Pingtan Strait Gongtie Bridge was closed yesterday morning, meaning that China has built the world's longest cross-sea highway railway dual-purpose bridge.
Under the blue sky and white clouds, the bridge stands like a dragon on the blue sea. The representative of the labor model cut the ribbon for the bridge, the crowd cheered, the fireworks burst in the air, and the five-star red flag was in the wind. "I am as happy as seeing my child's birth!" said Zhang Lichao, deputy chief engineer of China Railway Bridge Bureau and winner of the National May 1st Labor Medal.
Successfully challenged "bridge building restricted area"
The bridge connects Fuzhou Changle with Pingtan, the fifth largest island in China, and repairs the Beijing-Taiwan high-speed railway in the 13th Five-Year Plan to the nearest place to Taiwan Island, Pingtan, Fujian, which is only 68 nautical miles from Hsinchu, Taiwan. .
The Taiwan Strait, where the bridge is located, is one of the three major storm seas in the world, which is in the same name as Bermuda and Cape of Good Hope. It has more than 300 days of windy days above 6th grade. The bridge site is the ancient "Maritime Silk Road" main road, there are more than 10 ancient shipwreck sites under the water, which is a testimony to the bad sea conditions.
Since the opening of the bridge in 2013, the builders have challenged this “bridge-breaking zone” with high winds, high waves, rapid flow and hard rock.
Engineers have developed a new hydraulic rig that records a 4.9-meter-diameter bored pile into a hard, iron-like rocky seabed.
Tens of anemometers, wave instruments and current meters are arranged along the bridge to accurately predict the wind, wave and current conditions within 5 days, helping the builders to seize the valuable construction window.
“Only about 120 days of construction is suitable for construction all year round. We have to find ways to reduce on-site construction,” said Wang Donghui, chief engineer of the bridge.
They produce prefabricated steel trusses at factories hundreds of kilometers away, then ship them to the bridge site and assemble them one by one with large floating cranes. The China Railway Bridge Bureau, which undertakes the construction task, specially developed the “Big Seagull” floating crane, which has a gravity of 3,600 tons, equivalent to the weight of 2,400 cars.
“The Pingtan Strait Gongtie Bridge is the most difficult bridge in the world.” Wang Donghui said that after the completion of the bridge, a 3.5-meter-high wind barrier will be installed to ensure that the vehicle will pass safely in the ten-level wind.
Exploring and building "a common homeland for compatriots on both sides
The upper level of the bridge is a six-lane expressway, and the lower level is a high-speed railway. It is an 88-kilometre-long “state” Ping (Tan) railway “throat”. The bridge is expected to be officially opened to traffic next year.
China established the Pingtan Comprehensive Experimental Zone in 2010 to explore the construction of a "cross-strait compatriots' common homeland", and large-scale infrastructure construction and development will follow. Thousands of Taiwanese have come to this emerging city to live and work.
The bridge brings Pingtan into the high-speed rail era
“The bridge brought Pingtan into the high-speed rail era, which made the Taiwan compatriots full of good yearnings,” said Chen Jianxiang, a Taiwanese entrepreneur who started a business in Pingtan.
The Wuhan Yangtze River Bridge, built by the China Railway Bridge Bureau in 1957, is an important symbol of the construction of the new China. After the reform and opening up, China has continuously created a record of world bridge construction. The giant bridge including the Hong Kong-Zhuhai-Macao Bridge has been set up between the rivers, lakes and lakes and the mountains and valleys, and has opened the artery for economic development.
"The super bridges are the epitome of the 70-year grand changes in New China," said Liu Ziming, chairman of the China Railway Bridge Bureau.