The dredging operation of the deep and middle channel sinking tunnel base slot is completed

Text/Yangcheng Evening News reporter Wang Danyang Correspondent Wang Danyang Collection of Xuanyue Road Jian Shenzhong Dynasty Pavilion

The vastness of the ocean, striving for the Greater Bay Area. On June 30, the construction of the Shenzhen -Macao Greater Bay Area Super Engineering Shenzhen Channel Construction was reported again. With the large -scale grabbing of the sea construction ships steadily loaded the last bucket dredging into the barrier, the deep and middle channel's sink tunnel base groove dredging project was completed.

After more than 1,400 days, the 5 kilometers of base tunnel base tank excavation was completed

The Shenzhen -Middle Channel is a world -class cross -sea cluster project that integrates "bridges, islands, tunnels, and underwater interoperability". The total length is 24 kilometers, and the submarine tunnel is about 6.8 kilometers long. Among them, the sinking section is about 5 kilometers long. It consists of 32 tube festivals and one final connector. It is currently the widest underwater sink tunnel in the world.

"The first process of the project sinking tunnel is installed in the installation of the tunnel is to deal with the base groove of the tunnel. The construction is located in the Linglongyang waters, with complex geological conditions, large base tanks, and difficulty in digging sand and pit areas. Features. "Liu Xiaofeng, an engineer of the island tunnel engineering management department of the Shenzhen -Middle Channel Management Center.

It is understood that the foundation of the base slot dredging is the first process of the sinking tunnel project. The construction content includes rough excavation, refined digging, rock treatment, dredging and floating channel dredging of the foundation tunnel tunnel. On the design line of the deep and middle channel sinking tunnel tunnel, in addition to a large amount of sediment, there are also a lot of hard rocks that need to be removed, and the basic project for the construction of tunnel sinking pipes -deep cement mixing piles, which exceeds the elevation high level, which exceeds the elevation high level. The part needs to be removed.

The construction of the base slot of the Shenzhong Channel Channel Tunnel is implemented by the CCCC Guanghang Bureau. Since the construction of the foundation tunnel base slot project of the Shenluan Tunnel in July 2018, it has been invested in the first domestic excavation of mud, the first deep sea clearing, Dredging construction ships such as stasis ships and self -navigable muddy vessels have accumulated 17 ships. In more than 1,400 days and nights, the builders overcome multiple factors such as navigation, environmental protection, climate, and geology, and dug a deep -sea base tank about 5 kilometers long and 330 meters wide between the east and west artificial islands of the Shenzhen -Middle Channel. And successfully completed the excavation of the sinking pipe floating channel. So far, the smooth installation of 26 knots of 80,000 tons of sinking tube has been guaranteed.

The giant "tofu" is carefully crafted, and the precision of the base slot excavation is centimeter level

The deepest part of the foundation tunnel base slot is about 40 meters, and the original water depth of the construction area is only 3 to 5 meters. It is constructed in the case of extremely deep and geological complexity, as if in a giant "tofu" Operation. The huge amount of dredging projects require super equipment support. As a major national project, the requirements of the deep and middle channels for the construction accuracy of the foundation tank and the sewage construction are far exceeded that the conventional dredging construction technical standards are also exceeded. "As a deep -sea project hidden under the water, its construction process accuracy requires reaching centimeter level. It is currently a rare high -precision high -precision excavation and dredging construction in China. Ma Dingqiang, the manager of the Shenzhen Communication Bureau of China Communications Guangzhong Channel, said.

To this end, the construction team has independently developed the first domestic caught -type digging ship "Jinxiong" wheel with a fixed -level excavation function. Its fine excavation control system consists of dozens of sensors and monitors connecting to 7 computers. With this system, the "Jinxiong" wheel can use a huge grabbing of 12 meters high and 90 tons to overcome multiple influences of its own gravity, waves, and sea flow. On the bottom of the 30 meters, the excavation accuracy of the base slot is controlled at 50 Within centimeters.

The 35 -ton rock chinetic stick of "hard bone head" under the sea bottom

"The most difficult to deal with the foundation of the base slot is the hard rocks and DCM piles on the bottom of the sea (deep cement mixing piles)." Yang Jingpeng, executive deputy manager of the Shenzhen -Middle Channel project of the China Communications Guanghang Bureau Nearly 300,000 cubic meters of full -telled granite and stroke granite have a maximum depth of nearly 40 meters, which is very difficult to remove.

In the past, similar projects were generally used underwater blasting construction, but in order to ensure the safety of the ecological environment, the deep and middle channels were used for multiple comparison demonstrations. Essence This deep -water and deep groove high -precision rock treatment construction process has few precedents worldwide.

In addition, according to the design requirements, a deep cement mixing pile needs to be set up in part of the tube base slot of the sink tunnel, but the pile head that exceeds the elevation part needs to be removed. The construction team adopts a segmented and layered construction process. First, the pile head of the giant grabbing "bite" the pile head, and then use the power to "chew" the pile head due to the strength of gravity. , Ensure that accuracy is controlled within 50 cm.

After 4 years of struggle, the deep and middle channels of the deep and middle channels completed all excavation projects, creating prerequisites for the floating transportation of the last 6 section of the pipes, which was completed and opened to traffic for the Shenzhen -Middle Channel in 2024 to help the Guangdong -Hong Kong -Macao Greater Bay. The development and building the "Golden Inner Bay" of the Huanzhu River Estuary laid a solid foundation.

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