What is the progress of the Ningwu Railway capacity expansion and renovation?

“When I drive, I often have to pass by the old Ningwu Railway. The queue of cars is too long and I have to wait for several traffic lights before I can pass. I hope the new line can be completed soon.” said car owner Li Mingqiang.

“When I send my child to tutoring class, I have to pass by Xiaoxing’s intersection, and I often have to wait for more than ten minutes. Time is not abundant to begin with, and it is too anxious.” said Aunt Zhang, who often needs to send her grandson to school.

A Ningwu Railway

Crossing most of Nanjing City

Affecting the travel and life of countless residents

Ningwu Railway Capacity Expansion and Reconstruction Project

How is the progress and when will the old line be relocated?

It touched the hearts of countless Nanjing people.

In 2024, accelerating the construction of the Ningwu Railway capacity expansion and reconstruction project was included in Nanjing’s transportation and people’s livelihood list. What is the current progress?

Recently, the Nanjing South Shield Tunnel section, which is a key node of the project, has successfully passed the first risk source and construction is progressing steadily.

“Ningwu” shield machineSuccessfully crossed the first risk source

recently

In the Nanjing South Tunnel section of the capacity expansion and reconstruction project

There are many machines on the ground

There is almost no sound of construction.

Under the Ground

Dozens of workers are busy operating

The “underground dragon” “Ningwu” shield machine is roaring forward

Nanjing South Tunnel

It is the Ningwu Railway Capacity Expansion and Reconstruction Project

Full line control engineering

Total length: 14.4 km

Single-hole single-line tunnel

Design speed 120 km/h

The shield section is about 2.4 kilometers long.

Construction using an earth pressure balance shield machine

Zhang Fanjun, shield manager of the second branch of the Ningwu Railway Project of China Railway 14th Bureau, introduced that on August 12 this year, the shield section of the tunnel started from the Meixiang Road working shaft in Yuhuatai District, and passed under the Nonghua River, Airport Expressway, Qinhuai New River, Hanfushan Beijing-Shanghai High-Speed ​​Railway Existing Tunnel, etc., passed over the S1 Metro Line, and ran parallel to the S3 Metro Line for a long distance, and finally reached the existing Hanfushan Tunnel in Jiangning District.

“Currently, the ‘Ningwu’ shield machine has excavated to the 136th ring, about 245 meters, and successfully crossed the first risk source – the Nonghua River.” Zhang Fanjun explained that when the shield tunnel passed under the Nonghua River, the top was 1.2 meters lower than the existing riverbed elevation, and the minimum vertical clearance with the newly built box culvert was 0.5 meters. The risk of passing under is high and the control requirements are high.

To avoid risks, the project team has repeatedly demonstrated the shield machine’s plan to cross the Nonghua River, and detailed safety technical measures and emergency measures. During the construction, the project team provided on-site protection, conducted 24-hour inspections around the risk source, measured ground subsidence, slag volume data, and synchronous grouting volume in real time, and strictly controlled the parameters and posture of the shield machine during the excavation process, ensuring that the shield machine successfully crossed the Nonghua River.

“We expect to reach 400 rings of excavation before the Spring Festival, and reach the key milestone of the shield section tunnel penetration by the end of October next year,” said Zhang Fanjun.