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At 13 o'clock on December 20, the bubbling water flowed through the pressurization station and the water conveyance tunnel, gushing out of the Dg26 working well of the C1 standard of the Pearl River Delta Water Resources Allocation Project, and flowed straight down more than 40 meters into the DG27 working well. So far, the water of the Xijiang River has flowed smoothly into Dongguan, and a key step has been taken to achieve the goal of opening up water to the whole line.
In order to ensure the smooth completion of the project's water inflow work, the Pearl River Delta water resources allocation C1 project team carefully prepared and carefully deployed, and held several special meetings to conduct a comprehensive verification of the water-related work to ensure that the tunnel has water access conditions. Since the Pearl River Delta Water Resources Allocation Project started to fill water on December 1, it took 20 days for Xijiang water to flow into Dongguan. For this moment, all the builders of the project department struggled against various construction difficulties, achieved the node goals one by one, and achieved the goal of water supply by the end of 2023 as scheduled after more than 1,600 days and nights of tenacious struggle.
Lot C1 is part of the section from Shaxi High Reservoir to Luotian Reservoir of the main water conveyance line, and the total length of the project is 17It consists of 29 kilometers of water conveyance tunnels, 1 inverted siphon with a total length of 487 meters, 2 working shafts, 2 maintenance traffic tunnels, 3 ventilation shafts and maintenance drainage shafts. The bid section project has the characteristics of "one first", "two unique" and "six most", and has invested the first and only open TBM in the history of water conservancy engineering construction in Guangdong Province, the only inverted siphon engineering construction of the whole line, the longest construction bid section of the main line of the whole line, and the most complex bid section of the construction technology and construction method of the whole line (drilling and blasting tunnel construction, TBM tunnel construction, shield tunnel construction, inverted siphon engineering construction, shaft engineering construction), The longest tunnel project of the plug excavation construction of the whole line (the length from the exit to the entrance of the TBM tunnel in Dalingshan is 10,340 meters), the longest drilling and blasting tunnel project of the whole line (1 The total length of the main tunnel is 4,530 meters, two-way drilling and blasting construction, and there is no branch tunnel in the middle), the tunnel project with the largest buried depth in the whole line (the minimum buried depth of the TBM tunnel section of Dalingshan is 13 meters, and the maximum buried depth is 235 meters), and the deepest shaft project of the whole line (the drilling and blasting tunnel section SL01 ventilation shaft, inner diameter is 5.).6 meters, well depth 156 meters).
The Pearl River Delta Water Resources Allocation Project is a major water conservancy project and an important water conservancy infrastructure that is incorporated into the "five vertical and five horizontal" water resources allocation backbone network of Guangdong Province, which is of great significance for the construction of a multi-city dual water source guarantee pattern in the Guangdong-Hong Kong-Macao Greater Bay Area. The total length of the project is 1132 km, the design flow rate is 80 cubic meters per second, and the annual water supply is 170.8 billion cubic meters, after completion, it will divert water from the Xijiang River system to the eastern part of the Pearl River Delta, solve the problem of water shortage in Guangzhou, Shenzhen and Dongguan, and provide emergency backup water sources for Hong Kong and other places, so as to fully guarantee the water supply security of the Guangdong-Hong Kong-Macao Greater Bay Area.