At 9:58 on February 5, 2021, in the receiving shaft near the intersection of Tongjing North Road and Beihuan Elevated Road, Gusu District, Suzhou City, with the huge cutterhead of the "Gusu" shield tunneling machine, the hole was excavated. The tunnel on the left side of the road went through smoothly, and the north extension project of Tongjing Road, which has attracted the attention of Suzhou citizens, has made significant progress, which has provided a solid foundation for the efficient follow-up of the project.

The north extension project of Tongjing Road starts at Chengbei Road, crosses Xitang River to the south, crosses Qingtang Road, Shantang River, Shanghai-Nanjing Intercity High-speed Railway, Beijing-Shanghai Railway, Beihuan Expressway from underground, and connects with Tongjing North Road. The total length of the line is 2.49 kilometers, and it adopts two-way six-lane urban arterial road standard construction, and the designed driving speed is 60 kilometers per hour.

The cumulative settlement value under the operating high-speed rail is only 0.4 mm

According to reports, Tongjing Road is a “dead-headed road” that Suzhou has been trying to open up for ten years. It is one of the busiest high-speed rail lines in my country because it runs through the Shanghai-Nanjing intercity high-speed rail running at a speed of 350 kilometers per hour. The minimum travel distance is 3 minutes. During the construction period, the settlement of the high-speed railway line must be controlled at 1 mm. The construction standard is high and the construction is difficult. There is no precedent at home and abroad.

Therefore, the Tongjing Road Tunnel is the key control project of the entire project. Under the "consultation" of the top domestic think tank led by Academician Qian Qihu, the high-speed rail is operated under the form of a shield tunnel and is currently the first in China and the world The first large-diameter shield tunnel underneath the operating high-speed railway.

After three months of underground excavation, the left-line tunnel was the first to pass through. The accumulated settlement value of the Shanghai-Nanjing intercity high-speed rail was only 0.4 mm, which did not have any impact on the operation of the high-speed rail, showing the world-class level of shield construction.

Driving the big country heavy equipment all the way through 6 super risk points

The Tongjing Road shield tunnel adopts a dual-hole, 6-lane design with an outer diameter of 13.25 meters. The construction was constructed by the China Railway 14th Bureau Group, a leader in the domestic shield industry, with a 13.67-meter excavation diameter.

The construction team gave full play to the technical advantages of the shield tunnel construction across the river and sea over the years, developed and applied visualized intelligent construction, intelligent monitoring and perceptual early warning technology, and controlled the tunneling parameters of the shield machine in real time through big data, and successively smoothly passed through the Shanghai-Nanjing intercity high-speed rail, For 6 high-risk sources including the Beijing-Shanghai Railway, the shield machine successfully reached the receiving well. After the whole process of tracking and monitoring, the data is stable and the settlement deformation meets the requirements.

The shield machine went out of the hole smoothly. The happiest part was the on-site construction staff. They put on various "fancy" celebration moves in front of the shield machine cutter head and expressed their wishes for the New Year. After the shield machine is excavated in the ground, in addition to normal maintenance, it basically does not stop for 24 hours, and the construction personnel implement daily shift operations (handover at 7 am and 7 pm). Shield machine captain Wu Juncai told reporters that during the three months of tunneling of the shield machine, his energy has been highly concentrated. Starting today, I can finally rest and adjust with confidence. The first tunnel was successfully completed, and valuable experience was accumulated for the construction of the next tunnel. The right tunnel will be safer, more efficient and more efficient.

Building the project is the best New Year gift

According to the project secretary Liu Xinhua, during the Spring Festival this year, the vast majority of workers will "stay in the Soviet Union for the New Year" and work until New Year's Eve. The Huqiu Sub-district Office and Huqiu Scenic Area of Gusu District have decided to open up a "special spot" event for the Spring Festival sightseeing tour for them, and invite builders to come to the "Huqiu Scenic Area" to experience the real "Soviet New Year".

It is reported that after the completion of the north extension project of Tongjing Road, it will be possible to reach Yongfang Road directly from Tongjing Road, saving 20 minutes of time than detouring. At the same time, it will open up traffic links between the north and south areas, which will improve the traffic conditions in Suzhou and promote social and economic development along the route. It is of great significance to improve the energy level of Suzhou city. Editor/Sang Xiaomei