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Interpretation: how can the middle route of the South-to-North Water Transfer cross the Yellow River

interpretation: how can the middle route of the South-to-North Water Transfer cross the Yellow River

China Construction Machinery Information

guide reading: at 10:28 on December 22, in Xingyang, Henan Province, the shield machine crossing the Yellow River for the middle route of the South-to-North Water Transfer Project reached the working shaft on the South Bank of the Yellow River, and the first tunnel crossing the Yellow River was successfully completed. How to excavate a 4250 meter long tunnel with a single hole diameter of 7 meters at the depth of 40 meters under the Yellow River? How to prevent water leakage and collapse

at 10:28 on December 22, in Xingyang, Henan Province, the global production capacity of AKRO in the middle line of the South-to-North Water Transfer Project has reached 150000 tons. The "crossing" shield machine of the Yellow River Crossing Project arrived at the working shaft on the South Bank of the Yellow River, and the first tunnel of the middle line crossing the Yellow River was successfully completed

how to excavate a 4250 meter long tunnel with a single hole diameter of 7 meters at the deepest 40 meters under the Yellow River? How to prevent water leakage and collapse

the average annual water transfer is 9.5 billion cubic meters, which supplies water to the north of the Yellow River, and can also replenish water to the Yellow River on camera.

Zhang Jiyao, director of the south to North Water Transfer Office of the State Council, introduced that the Yellow River crossing project in the middle line of the south to North Water Transfer Project is currently the largest project across major rivers in China. Its task is to transfer water from the South Bank of the Yellow River to the North Bank of the Yellow River, supply water to the north of the Yellow River, and replenish water to the Yellow River camera when the water volume is abundant

according to the introduction, the design flow of the first phase of the middle route of the South-to-North Water Transfer Project is 265 cubic meters/second, and the increased flow is 320 cubic meters/second. After completion in 2014, the annual average adjustable water will be 9.5 billion cubic meters

in September 2005, the Yellow River Crossing Project of the middle route of the South-to-North Water Transfer Project was officially launched. According to the price level of the sizing block under the base adjusted or increased by 200 in June of 2004, the total investment of the Yellow River Crossing Project of the middle line is 3.137 billion yuan

the first tunnel of the Yellow River Crossing Project of the middle route of the South-to-North Water Transfer project runs through the shield machine with a diameter of 9 meters. The principle is similar to that of an electric razor, driving more than 10 meters every day.

is the water transfer of the middle route passing through the Yellow River, a flying aqueduct, or a tunnel at the bottom of the river? There was a dispute between the two plans

the Construction Management Bureau of the middle route of the South-to-North Water Transfer Project will show you the impact toughness of the pendulum impact tester. First of all, the two schemes of tunnel and aqueduct have their own advantages and disadvantages in technology. In contrast, the tunnel scheme can be free from adverse factors such as temperature, freezing and strong wind, with good durability and relatively simple maintenance. After a long time of demonstration, the tunnel scheme was finally selected

how to dig a tunnel 40 meters deep at the bottom of the Yellow river bed

Wang Jiangtao, chief engineer of Henan direct construction and Management Department of the middle route of the South-to-North Water Transfer Project, said that the shield machine and cutting tools of the Yellow River crossing project are customized according to the construction conditions of the Yellow River crossing project. The slurry pressure balance shield machine selected for the Yellow River Crossing Project of the middle line has a diameter of 9 meters and a total weight of 1100 tons. There is a cutter head in front of the shield machine. There are more than 140 blades on the cutter head. The cutter head rotates to cut large pieces of soil into small pieces. Its working principle is similar to that of an electric razor

"when excavating tunnels at the bottom of the Yellow River, the most worrying thing is to encounter ancient trees and boulders during tunneling." Wang Jiangtao said that the technicians set up ultrasonic detectors on the shield machine and dealt with the situation in a timely manner

when encountering ancient trees and boulders, the crushing equipment set on the shield machine will play a role, crushing wood and stones into slag blocks less than 16 cm, and discharging them along the mud pipe

according to the introduction, the shield machine propulsion system has 14 sets of jacks, with a total thrust of 6034 tons. The jacks are placed on the side wall of the assembled segment, and the whole shield machine is pulled forward at a speed of more than 10 meters per day

the project is resistant to 7-degree earthquake, and the leakage prevention measures do not drip water. The flood control standard is designed according to the 300 year return period

how to prevent water seepage or collapse when tunneling underwater

ZHENG Zhengyu, deputy director of the central line Construction Management Bureau, said that every 1.6 meters forward, the shield machine must stop to "breathe". The construction personnel should immediately install reinforced concrete segments for the excavated tunnel. Seven arc segments are close to the tunnel, which is exactly a big circle

the segment is completely cast by reinforced concrete, with a thickness of 40 cm, which can fully support the pressure of the whole tunnel without collapse

in terms of leakage prevention, the tunnel also has corresponding protective measures. The first is the external segment. The two segments are connected together through slots. In addition to the segments made of waterproof materials, there are rubber strips at the edges. This rubber strip will expand when it meets water, connecting the segments without any gap, and the external water and sediment cannot enter at all

in addition to the external segment, there is a layer of steel wire in the middle, which has a protective film on it to play a second protective role. The lining of the tunnel is the third protective layer

Wang Jiangtao said that according to the seismic risk analysis of the analysis and Prediction Center of the National Seismological Bureau, the terrain of the tunnel across the Yellow River is complex, and the basic seismic design intensity is 7 degrees, that is, the whole design and construction should be able to withstand the test of a 7-degree earthquake

the main structures of the Yellow River crossing project are designed according to the 300 year flood of the Yellow River and checked according to the 1000 year flood; The open channel on the north bank and the new and old mang river crossing buildings are designed according to the 100 year flood and checked according to the 300 year flood

overhaul once every 3-5 years. During the overhaul, empty the water in the tunnel, and drive the maintenance vehicles directly into the tunnel.

after the river bottom tunnel is completed and connected with water, how to overhaul it? The 800 meter inclined tunnel of the shaft on the South Bank of the Yellow River is specially designed and built for this purpose

3450 meters of straight tunnel, only one thousandth of the inclination is allowed, while the last 800 meters of inclined tunnel, the inclination reaches 4.91%. At 32 meters underground of the shaft on the South Bank of the Yellow River, the working face of the shield machine began to tilt upward until the tunnel was opened

after the completion of the tunnel, there will be a 15-30 day maintenance period every year. Overhaul will be arranged every 3-5 years, and the water in the emptying tunnel will be checked every half a year or so. The inner diameter of the double tunnel is 7 meters and the outer diameter is 8.7 meters. During maintenance, maintenance vehicles can drive directly into the tunnel