It took 424 days, the highest record! The Northern Extension of Wanjiali Expressway (including Power Tunnel) was fully opened.
Release Time:
2021-11-22 09:50
Source:
At 18:00 on November 20, the cutter of 14# shield machine of China Railway Shanhe rotated slowly and finally broke out of the hole with precision, marking the full passage of Wanjiali Rapid Transformation North Extension Line (including power tunnel).
The project will further accelerate the solution of power problems in the eastern part of Changsha city, and serve the provincial and municipal key projects such as Metro Line 3, Line 5, and ChangZhuTan Intercity Railway.
The Wanjiali Rapid Transformation North Extension (including the power tunnel) contains three intervals with a total length of 5km and is constructed by the shield method. It took a total of 424 days from September 22, 2020, when the 13# shield machine of China Railway Shanhe started, to August 30, 2021, when the 13# shield machine of China Railway Shanhe realized the first interval penetration, and then to November 20, 2021, when the whole line was successfully penetrated. During this period, the fastest digging speed achieved by the shield machine of China Railway Shanhe reached 15 rings in a single shift and 29 rings in a single day, which is the highest record of shield construction in Changsha City.
☟Central Iron Mountain River 13# shield machine started
☟ first section through
☟ first interval through
☟ 3#~4# well penetration
☟ 14# shield machine penetration and full line penetration
It is understood that the interval tunnel laying along Wanjiali North Road, the interval shield construction is extremely difficult, high safety risk. On the one hand, the shield in many places down through, side through sensitive buildings, including subway line 5, schools, residential neighborhoods, commercial office buildings, etc., on the way in and out of the exit shaft, start and receive as often as 14 times. On the other hand, the shield traverses the complex and changeable, soft and water-rich strata, and penetrates the Liaojiao River and the city highway for a longer distance.
In order to ensure the safe and orderly advancement of shield construction, the project team actively carried out technical research and reasonably prepared special programs. When the shield machine passes through the high risk source section, the leader with the shift stares at the progress on the spot, and rectifies the hidden danger of safety and quality problems in time; at the same time, it arranges special personnel to maintain the equipment, and ensures that the shield machine, battery car, gantry crane, etc. efficiently serves in the production. In addition, the project team planned ahead, actively stockpiled pipe pieces, mixing slurry and other raw materials to ensure uninterrupted construction; at the same time, strictly checking the quality of pipe piece assembly, synchronized grouting to ensure the quality of the construction, all-weather tracking and monitoring of the shield machine status, analysis of monitoring data, to provide effective technical support for the shield tunnelling.
With the concerted efforts of the project team, the shield tunnelling machine of China Railway Shanhe safely completed the tunnelling task, which accumulated valuable technical and management experience for the company in the field of metro tunnel construction, cultivated a group of shield tunnelling construction technology and management talents, and laid a solid foundation for the company's rolling development in Changsha market!
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