It only takes 4 minutes to from Nansha to Dongguan after completion!The reporter will take you to explore China's largest deep -buried underwater tunnel project

In the Pearl River entrance between Dongguan, Guangzhou, another super engineering standing on the top of the world is conducted on the bottom of the sea. Essence

The positive line of the Shenjiang Railway is 116 kilometers long. It is a cities in Shenzhen, Guangzhou, Dongguan, Zhongshan, and Jiangmen. aisle. After the Shenjiang Railway is completed and opened to traffic, the Qianhai Free Trade Zone in Shenzhen and the Nansha Free Trade Zone in Guangzhou will achieve half an hour of high -speed rail interconnection.

(Zhujiangkou Tunnel)

The Zhujiangkou Tunnel is the control project of the Shenjiang Railway, that is, the most difficult part of all projects. The largest underwater depth of the Pearl River Estuary Tunnel Sea is 115 meters underwater. It is the deepest record of China's underwater tunnel. The hydrology and geological conditions are extremely complicated. The surrounding environment is more water corrosion. , To the world's most. After the tunnel was completed, it only took 4 minutes to drive from Nansha to Dongguan.

Recently, the reporter came to the construction site of the 2nd bidding section of the Pearl River Estuary Tunnel undertaken by the China Railway Tunnel Bureau Group, and interviewed the submarine tunnel with a depth of 31 meters. In December 2021, the "Greater Bay Area" shield machine entered the bottom of the Pearl River Estuary from the beginning of the Nansha Wanzi Sands and excavated from Dongguan. So far, it has excavated over 800 meters.

"Ultra -long distance+ultra -high water pressure+complex geology" has become a challenge

The positive line of the Shenjiang Railway is introduced from the planned Shenzhen Hub Xili Station. It is introduced to Jiangmen Station of Shenmao Railway through Shenzhen Baoan, Dongguan Binhai Bay, Guangzhou Nansha, Zhongshan to Jiangmen. In 2025, the Shenjiang Railway will be opened to traffic.

After the Shenjiang Railway was completed and opened to traffic, the Shenzhen Hub Xili Station and the Gan Shen Passenger were opened to connect with Ganshen Passengers. At Shenzhen Airport Station, connecting the Xiamen -Shenzhen Railway and Guangshen Hong Kong Passenger Specialty at Shenzhen Airport Station. From the direction of Shenzhen, the main line of Jiangzhan Railway is connected at the Jiangmen Station.

(Zhujiangkou Tunnel Project)

As the control project of the Shenjiang Railway, the Pearl River Estuary Tunnel project is 13.69 kilometers in length and is in the shape of a "V". The China Railway Tunnel Bureau Group has undertaken the most difficult Pearl River Estuary Tunnel 2 bidding section. Its construction content includes a 9.1 -kilometer submarine tunnel and an emergency channel of the Nansha Industry District. The project started construction on July 2, 2020.

The reporter learned at the scene that the standard section contains 5,490 meters of the mine tunnel, 2,930 meters of the shield tunnel, 755 meters of Ming dug tunnel, and 1160 meters in a sloping well. The shield machine disassembled the cave at the boundary point of the shield method and mining method construction in this standard section. When the shield machine comes to this position, it will be disassembled and moved away in the cave.

According to Xu Binbin, a chief engineer of the China Railway Tunnel Bureau Group Co., Ltd. Shenjiang Railway 2, China Railway 2nd Bid Project, the most deep underwater tunnel in China brought a lot of challenges to shield construction. Among them, the powerful water pressure requires the shield machine to the extreme in sealing. In addition, there are also composite geological problems such as liquefied sand layer areas, uneven soft and hard segments, close -up side -to -side side -by -side bridges, and crushing bands along the Zhujiangkou Tunnel of the Shenjiang Railway. Essence

(Box culvert in the tunnel)

The three groups of broken bands and 6 seminated fracture bands in the Pearl River Estuary Sea make the rock body's unevenness of unevenness of the rock body. Risks such as stagnation, which put forward extremely high requirements for the performance of shield machine performance, excavation parameters, tunnel prefabricated components, and assembly quality.

"Broken belt means that the surrounding rocks in the formation are extremely broken, and the self -stability ability is particularly poor. If the shield machine is not well -pressed, it may cause a collapse of the palm surface. Milla, a large wear for the knife, which means that the frequency of sword changing will be very high. "Xu Binbin said.

Shield construction has been completed 27.3%

The shield construction task is the "Greater Bay Area" shield machine. The shield machine is tailor -made for China's deeper underwater tunnel. Its excavation diameter is 13.32 meters, a total length of 133 meters, and a total weight of 3900 tons.

("Greater Bay Area Code" Shield Machine)

Xu Binbin said that the "Greater Bay Area" has the function of converting knives, which means that staff can replace the tools in the normal pressure environment. If the shield machine needs to replace the tool, it must press the pressure compartment after the blade to ensure that it is quite stressed as the strata environment. Staff needs to change the tool in a high -pressure environment that is 2 times higher than normal air pressure, and the risk factor is high. Digital technology also allows the "Greater Bay Area Code" to have self -perception functions. Specific data such as speed, slurry flow, and knife speed can all appear one by one. "The tool grinds for a few millimeters, we all know." Xu Binbin said.

As the national team of tunnel construction, the China Railway Tunnel Bureau Group made a response plan for risk points. For example, the nearest distance of the tunnel is more than three meters away from the Bridge Pile of the Bridge. In order to prevent problems such as bridge pier tilt, the builders also conducted targeted design of the shield machine and conducted investigations, assessment and geological replenishment in advance. There is also a mangrove forest in front of the tunnel. According to the original construction design, the surface of the mangroves is to be vertically reinforced, so that the mangroves will inevitably be destroyed. To this end, the builder also changed the vertical reinforcement to the tunnel radial grouting to avoid the impact on mangroves.

At present, the "Greater Bay Area" is advanced at a speed of 12 meters to 16 meters per day. The maximum excavation speed is 50 mm/minute, and the fastest daily progress reaches 24 meters. Each of the shield machine is installed two meters of pipes every two meters. As of now, it has been excavated over 800 meters. The shield section has completed 27.3%of the construction tasks.

The middle box of the tunnel will be used as an emergency channel in the future

At the construction site of the submarine tunnel 31 meters from the top of the top, the reporter saw that the main space of the tunnel with 13 meters of the outer diameter of the ring ring. The middle box and border culverts in the tunnel are also being built simultaneously. The middle box culvert is empty. Border box culvert is mainly used for ventilation. The middle box culvert is used as a logistics channel during the construction stage. After the tunnel is opened, the middle box culvert can be used as an emergency channel. If the train fails in the tunnel, the personnel on the car can enter the middle box and leave the tunnel through the stairs.

(Intermediate box culvert in the tunnel)

In the "Greater Bay Area Code" Shield Machine Management Room, the 24 -year -old shield driver Yang Yanzhang manipulated the big guy to dig forward. She just graduated from a university in Henan, and she was one of the few female drivers in the country who controlled shields in the country. "I like to work in actual hands, so I come to this position." Yang Yan said that she had previously learned a lot of technical materials and grew up as the driver of the "Greater Bay Area" under the gang of predecessors.

(Yang Yan, the driver of the shield, is operating)

It is not easy to control a large shield machine. A master driver needs to make judgments based on the various technical parameters of the shield machine, continuously improve the efficiency of excavation, and extend the life of the tool. "Today, the scene of Shield Construction has improved much more than before. It is not unusual to come to the tunnel construction." Yang Yan said that she would continue to study and become a deeper tunnel worker. Like Yang Yan, the concentration and enthusiasm of the builders will not be affected by the high temperature and noise in the tunnel.

At present, the "Shenjiang No. 1" shield machine is also starting from Dongguan Humen to the Pearl River Estuary Sea. It will go deep into the bottom of the sea with the "Greater Bay Area Code" shield machine. Their goal is to achieve precise docking and witness the completion of this century project.

Text/Guangzhou Daily · Xinhuacheng Reporter: Longyu Tu/Guangzhou Daily · Xinhuacheng Reporter: Yang Yaozhen Video/Guangzhou Daily · Xinhuacheng Reporter: Yang Yaozheng, Longyu Guangzhou Daily · Xinhua City Editor: Zhang Yingwu

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