[Explanation] The steel aqueduct of the main trunk channel of the Jiang-Huaipi River is located on the north side of the Jianghuai watershed.
As an important water supply source channel for the two cities of Hefei and Lu'an, it is more than 30 meters higher than the channel leading to the Yangtze River and the Huaihe River.
The main canal of the Pihe River volleyed across the Jiang-Huaihe Canal, and the channel can only flow through the erection of a traditional aqueduct. Like an elevated interchange, there is a "bridge on the bridge", forming a "river on the river" that allows boats to pass through the water. Interchange".
[Concurrent] Du Shenyun, Senior Engineer of Steel Structure Construction Company of China Railway Fourth Bureau
Our Pi River is responsible for the urban water use and irrigation functions from Lu'an to Hefei. It is an existing waterway, and our waterway leading the Jiang-Jihuai River runs north-south, so these two (water systems) are in our Jianghuai watershed. The place has carried out an "interchange". While building the waterway leading from the Yangtze River to the Huaihe River, we will build an aqueduct, and then walk through the upper water system, that is, the two water systems will each take their own paths without interfering with each other, which is also the need to ensure our ecological balance construction. .
[Explanation] It is understood that the total length of the main trunk channel of the Pihe River is 350 meters, of which the steel aqueduct is 246 meters long and weighs about 21,000 tons.
The designed flow rate is 150 cubic meters per second, and the designed water depth is 4.0 meters.
[Concurrent] Du Shenyun, Senior Engineer of Steel Structure Construction Company of China Railway Fourth Bureau
As you can see, our aqueduct is composed of an outer truss and our inner aqueduct. Our truss is very rigid. At the same time, this truss is a truss above and an arch below. Therefore, the combination of beam and arch guarantees us One of the stiffness and strength of the aqueduct skeleton, at the same time, we use corrugated steel webs, wall plates and groove bottom plates on the inside, which is a structure composed of external girder and internal groove.
[Explanation] According to Du Shenyun, how to ensure that the super load of the fully welded beam-arch structure steel aqueduct can withstand nearly 40,000 tons, which is equivalent to the weight of 25 high-speed trains. The welding technology and standards have become the guarantee of the safety of the entire steel aqueduct. , Stability is crucial technical support.
[Concurrent] Du Shenyun, Senior Engineer of Steel Structure Construction Company of China Railway Fourth Bureau
The welding seam of the full bridge of this aqueduct is nearly 100,000 meters, which is also equivalent to the distance from Lu'an to Hefei. In order to ensure the quality of our welding, our aqueduct is (achieved) three hundred percent, and these three hundred percent are Refers to: our self-inspection is 100% quality inspection; at the same time, the supervision unit is 100% inspection; then our third-party inspection unit also conducts 100% inspection, so it is said that a weld has to undergo three inspections, and only after passing the inspection can it pass (acceptance).
[Explanation] The design of the steel aqueduct solves the shipping problem; the production of the steel aqueduct solves the use problem.
Since the steel aqueduct needs to pass water all the year round, how to resist the corrosion of water to the steel and increase the service life of the steel aqueduct has become another problem that the designers need to solve.
[Concurrent] Du Shenyun, Senior Engineer of Steel Structure Construction Company of China Railway Fourth Bureau
Another feature is that the upstream surface of the aqueduct is made of stainless steel composite plate, the bottom plate of the aqueduct is (30+4) mm thick, and the side wall plate is (20+4) mm thick, and then it is a 4 mm stainless steel layer, which can resist It has been eroded by water for hundreds of years, and it is also maintenance-free. Therefore, our aqueduct is equivalent to our super anti-corrosion and green environmental protection features.
[Explanation] The project of diverting the Yangtze River to Huaihe River is the "No. 1 Project" of the province's infrastructure construction determined by the Anhui Provincial Party Committee and the Provincial Government. Livelihood projects related to water environment improvement.
The total length of the water transmission line is 723 kilometers (the total length of the water transmission line in the Anhui border is 587.4 kilometers), and the water supply scope covers 13 cities in Anhui Province and 2 cities in Henan Province, a total of 55 districts and counties, covering an area of about 70,000 square kilometers.
Liu Honghe reports from Hefei, Anhui
Responsible editor: [Ji Xiang]