Miracle China Tianhe Dreaming ｜ Henan： Seeing the Century Project Crossing the Yellow River and Crossing the Shahe River
Cctv news (Reporter Su Jin) On December 12, 2014, the first phase of the Middle Route of South-to-North Water Transfer Project was officially put into use. Up to now, more than 50 billion cubic meters of water has been transferred to the north, which is equivalent to transferring the Yellow River to the north for one year. The population benefited from the project exceeds 85 million.
The tunnel crosses the Yellow River for the first time, and the largest aqueduct in the world … … One project with world-class difficulty runs continuously and safely in Henan, making a clear water meander northward.
The Yellow River Crossing Project keeps the river from invading the river.
(Photo courtesy of China South-to-North Water Transfer Project)
Xingyang City, Zhengzhou City, Henan Province, from the air, the rushing "South Water" meets the Yellow River here, and the Yangtze River water in the north passes through two tunnels crossing the Yellow River and swoops down here, crossing the Yellow River in ancient times. This is the symbolic and controlling project of the middle route of the South-to-North Water Transfer Project-the Yellow River Crossing Project, which is called the "throat" of the middle route of the South-to-North Water Transfer Project. Its main task is to transport water from the south bank of the Yellow River to the north bank of the Yellow River safely and effectively.
"This is one of the most challenging parts in the construction of the middle route of the South-to-North Water Transfer Project." Wu Guoquan, director of the Yellow River Crossing Management Office of the Middle Route Company of China South-to-North Water Diversion Group, introduced that at the beginning of the design, two schemes were put in front of us. Some people proposed to fly across the channel, while others suggested to drill holes. "After repeated scientific argumentation and numerous mathematical model calculations, the technical difficulty, water quality safety, ecological protection and other factors were comprehensively considered, and finally the shield tunnel crossing yellow river scheme was selected."
The Yellow River Crossing Project is located about 30km upstream of the Beijing-Guangzhou Railway Bridge on the Yellow River in Zhengzhou City, Henan Province, with a total length of 19.30km. The most difficult project is the Yellow River Crossing Tunnel, with a single tunnel length of 4,250 m, of which the river crossing tunnel is 3,450 m long and the inner diameter of the tunnel is 7.0m m. The tunnel is arranged in parallel with two holes, and the center line spacing is 28m.
"Under the bed of the Yellow River, long deposits form various complex strata." Wu Guoquan still remembers the difficulties in construction. The shield machine moves forward slowly, and more than 100 cutters on the cutter head rotate and cut. The cutter head is worn, and it will continue to advance after replacement and repair; The geological conditions ahead are changeable, so the plan should be adjusted in time … …
A water diversion line is also a "scientific and technological innovation line". The breakthrough of technical problems has broken records: for the first time, a large-diameter tunnel was used to cross the bottom of the Yellow River, for the first time in China, a mud-water pressurized balanced shield machine was used for hydraulic tunnel construction, a 3.45-kilometer Yellow River channel was crossed at one time, and the accuracy error of the shaft reaching the south bank was successfully controlled within 3 cm.
According to reports, as of August 30, 2022, the tunnel crossing the Yellow River in the middle line has accumulated 35.75 billion cubic meters of water to the north, greatly alleviating the water shortage in Beijing, Tianjin and Hebei.
Shahe aqueduct, the first aqueduct in the world
(Photo courtesy of Shahe Aqueduct China South-to-North Water Transfer Group)
Lushan County, Pingdingshan City, Henan Province, Shahe Aqueduct is like a dragon flying across, entrenched in the Central Plains. This "overpass on the water" shocked the reporters of the online theme publicity campaign of the South-to-North Water Transfer Project, "Miracle China Tianhe Dreaming".
Shahe aqueduct project, with a total length of 11.9km, is one of the largest and most complicated control projects in the middle route of South-to-North Water Transfer Project, and the largest comprehensive aqueduct project in the world at present.
Zhang Peng, director of Lushan Management Office of China South-to-North Water Diversion Group Middle Line Company, introduced that the beam aqueduct of Shahe Aqueduct weighs 1,200 tons, and the integrated construction scheme of "lifting, transporting and erecting" was adopted to efficiently complete the project construction, which filled the technical gap in the design and construction of large-flow aqueduct in water conservancy industry at home and abroad.