Editor's note: Since the 81-kilometer-long Kaifeng to Zhengzhou section of the Lianhuo Expressway was completed and opened to traffic in 1994, by 2020, the province's expressway mileage will reach 7100 kilometers, and in just 26 years, henan high-speed has changed amazingly. From now on, reporters from Dahe Network will go to Luoyang, Hebi, Puyang, Xuchang, Luohe, Sanmenxia, Shangqiu, Zhoukou and other places to conduct interviews on the themes of "Yellow River Cultural Tour", "Reform and Development Tour" and "Comprehensive Well-off Tour" to show the all-round changes brought by the smooth flow of expressways to the economic and social development of our province.
Dahe Network News (reporter Zhu Chuanpeng) "137 meters high, long legs 125 meters, 93 meters below the neck!" Yes, this is the highest bridge in Henan Province - Hongnongjian River Special Bridge.
On June 21, the reporter of Dahe Network followed the interview group along the highway to see Henan and came to the Hongnongjian River Special Bridge, which is the largest control project of the National Highway 310 Southward Migration Project, with a single bridge cost of 950 million yuan, a bridge length of 3178 meters, a maximum span of 160 meters, and a bridge height of 137 meters.
A pile concrete with a volume of 5198 square meters, using a single pour molding, set a new record in the pile of similar bridges in Henan, due to the maximum span of 160 meters, it takes more than 300 days of continuous high-altitude hanging basket construction. This bridge is the longest bridge, the largest span and the highest pier of the 310 National Highway, regardless of the construction scale or the difficulty of construction, the Hongnongjian River Special Bridge is the well-deserved "first bridge" of the whole line. The superstructure of the main bridge adopts continuous steel structure, and the superstructure of the lead bridge adopts prestressed concrete continuous T-beam.
Hongnongjian River Special Bridge needs to overcome four major difficulties during the construction: deep piles, 93 meters deep underground, complex geological conditions, the use of rotary drilling rig and cyclotron drilling rig construction; large pile, the largest pile length of 35.8 meters, width of 26.4 meters, 5.5 meters high, a pile concrete square amount of 5198 cubic meters, the amount of steel reinforcement reached 549 tons, how to deal with the compactness of concrete and hydration heat is the difficulty of pile construction; high pier, the maximum pier height of 125 meters, for the first high pier in Henan Province, the construction of the use of climbing mold construction, with an average daily height of 1 meter climb 125 meters.
Hongnongjian River Special Bridge during construction (data map)
In addition, the large span continuous steel structure, the main bridge 160 meters span continuous steel structure, the use of hanging basket construction, each span will be divided into 2× 18 segments of sectional suspension construction. Each section is completed with vertical mold, steel reinforcement, concrete pouring, and after the concrete reaches the standard strength, the tension of the prestressed reinforcement is carried out, and then the hanging basket is moved to the next section, and finally Helong construction. On average, the construction of a section takes about 14 days, and the entire upper part needs to be continuously constructed for 314 days, which is the main factor restricting the construction period of the construction period of the national highway 310 southward transfer project.
The Hongnongjian River Special Bridge has realized the main bridge Helong on May 3, 2020, and the National Highway 310 Southward Transfer Project has realized the two-way test passage of 106 kilometers from the Interchange of Shichi to Lingbao West on December 1, 2020, and the project has liberated 6 cities, 23 townships and counties along the route, and 117 administrative villages, and solved the three major problems of congestion, environmental protection and safety of millions of people along the route.