Our reporter went deeper than 20 meters below sea level to explore the Shenzhong Passage

Changhong lying wave is magnificent, and the underwater overpass extends in all directions

Shenzhen Special Zone Daily Zhongshan, November 11 (Reporter Yan Junwei, Correspondent Yue Jiaoji, Xuanyue Lujian, Shen Zhong) At 28:11 on November 28, with the completion of the pouring of the last ballast concrete, the submarine immersed tunnel of the Shenzhong Channel, a major national project under construction by Guangdong Communications Group, was completed, which also means that the main line of the Shenzhen-Zhongshan Corridor Project, the core transportation hub of the Guangdong-Hong Kong-Macao Greater Bay Area, has been completed.

The Shenzhen-Zhongshan Passage is an important part of the national highway network G2518 across the Pearl River Estuary, about 30 kilometers away from the Humen Bridge in the north and 31 kilometers away from the Hong Kong-Zhuhai-Macao Bridge in the south. The project integrates "bridges, islands, tunnels and underwater interconnection", with a total length of about 24 kilometers, and is currently the most difficult cross-sea cluster project in the world.

The world's first two-way 8-lane steel-shell concrete immersed tunnel was built on the seabed

On the morning of the 28th, the reporter took a car to the immersed tunnel more than 20 meters below the sea level, and several construction workers skillfully poured the last ballast concrete, and the submarine immersed tunnel was through. In the middle pipe corridor in the middle of the two-way 8 lanes, additional construction personnel are carrying out a large number of pipeline installation and fire protection and smoke exhaust facilities. "If the Shenzhong Channel is regarded as an organic life, the pipeline is its nerve center system, which integrates the power supply, water supply and drainage, fire protection, communication and intelligent control of the entire Shenzhong Channel." Yuan Haisheng, the person in charge of the first mechanical and electrical standard of the Shenzhen-Zhongshan Channel Project of the <>th Bureau of China Railway, said.

On June 2023, 6, the final joint of the undersea tunnel of the Shenzhen-Zhongshan Corridor was successfully docked, and the entire line of the Shenzhen-Zhongshan Corridor was closed. Along the way, the construction team of the Shenzhen-Zhongshan Corridor has gone extremely hard - "The successful docking of the final joint means that the world's longest and widest submarine steel-shell concrete immersed tunnel has overcome all the technical problems, but the closure is only connected, and the construction of the final joint pipe can be truly connected." Chen Weile, commander of the construction of the Shenzhen-Zhongshan Channel of Guangdong Communications Group, said.

The country's first highway underwater interchange extends in all directions

In order to realize the rapid transformation of bridge and tunnel traffic functions, the Shenzhong Passage has set up two artificial islands in the east and west on both sides of the undersea tunnel, and there are four ramps on the artificial islands in the middle of the tunnel, which is the first underwater interchange of the expressway in China.

The reporter came to a fork in the road of the underwater interchange, and was wondering where the two passages in front of him, one left and one right, were going, and a huge electronic display screen next to him gave the answer. Located in the Lingding Ocean, the West Artificial Island is the key to the transformation of cross-sea bridges and undersea tunnels, with a diamond-shaped design and an area of about 13,7 square meters, equivalent to the size of 19 football fields. The East Artificial Island is located on the south side of Shenzhen Bao'an Airport, close to the Fuyong Airport Wharf, and is connected to the submarine immersed tunnel, realizing the efficient and smooth connection between the Shenzhen-Zhongshan Corridor Project and the Guangzhou-Shenzhen Yanjiang Expressway and other road networks. In the future, it can go to Huizhou and Longgang District of Shenzhen in the east, Zhongshan and Zhuhai in the west, Guangzhou and Dongguan in the north, and Qianhai Cooperation Zone and Hong Kong in the south through the east artificial island of the Shenzhen-Zhongshan Corridor.

The world's largest span all-offshore steel box girder suspension bridge was erected at sea

Looking down from the air, the Lingdingyang Bridge is like a long rainbow lying wave; Viewed from the sea, the Lingdingyang Bridge looks like a door to happiness.

In order to meet the needs of navigation, the Lingdingyang Bridge of the Shenzhen-Zhongshan Passage adopts the world's largest full-offshore suspension bridge scheme with a main span of 1666,91 meters, with a bridge deck of 3 meters, and is located in the open waters of the Pearl River Estuary and the frequent occurrence of strong typhoons, with prominent wind resistance problems. "In the face of technical challenges, we have organized a number of universities and scientific research institutions to carry out parallel research for more than 70 years in a four-in-one way of production, learning, research and use, and developed a new combined pneumatic control technology, which has greatly improved the wind resistance of large-span steel box girder suspension bridges for the first time in the world." Chen Huanyong, an engineer of the Shenzhong Channel Management Center of Guangdong Communications Group, introduced that the project will increase the critical flutter wind speed of the large-span steel box girder suspension bridge from 88 m/s to <> m/s, breaking the authoritative judgment of foreign countries in one fell swoop.

Meticulously crafted to create a new landmark in the Guangdong-Hong Kong-Macao Greater Bay Area

The main line of the Shenzhong Passage runs through, which is like the delivery of a "rough house". In the next step, the builders also need to carry out "fine decoration" and make every effort to create a safe, durable and pleasing passage project.

At the construction site of the bridge deck of the Lingdingyang Bridge, the pavers marched in line, the rollers shuttled back and forth, and behind the builders, the black asphalt pavement slowly unfolded on the Lingding Changhong. Mao Nongping, chief engineer of the project department of the S15 contract section of the Shenzhong Passage of Poly Changchang Engineering Co., Ltd., introduced that the construction team implemented the whole link of mechanized and intelligent construction, which greatly improved the construction efficiency, and planned to complete the pavement pavement of the bridge project early next year, and simultaneously carry out the pavement asphalt pavement in the tunnel.

Next to the 270-meter-high pylons of the Lingdingyang Bridge, builders are operating tower cranes to transport materials. "In the next step, a 'big hat' will be installed on the top of the tower of the Lingdingyang Bridge - the tower crown, which is mainly used to protect the main cable, and the elevator for future maintenance will be installed in the tower, and then we will have the whole line of anti-corrosion coating construction, etc., which are important construction tasks to be completed before the project is opened to traffic." Yao Zhi'an, deputy director of the Shenzhen-Zhongshan Channel Management Center of Guangdong Communications Group, said.

At present, the builders of the Shenzhen-Zhongshan Corridor are making every effort to promote the construction of housing construction, mechanical and electrical and ancillary projects, and sprint towards the goal of completion and opening to traffic in 2024. After the opening of traffic next year, the journey from Zhongshan to Shenzhen will be shortened from about two hours to less than 30 minutes, and the Shenzhen-Zhongshan Corridor will become a new landmark in the Lingding Ocean and even the Guangdong-Hong Kong-Macao Greater Bay Area.

Construction memorabilia

December 2016, 12

The construction of the west artificial island of the Shenzhong Corridor Pilot Project began

December 2017, 9

The 57th super-large diameter steel cylinder was vibrated and sunk on the west artificial island, creating a new record of rapid island formation in 4 and a half months

December 2017, 12

Construction of the East Artificial Island began

December 2018, 4

The construction of the immersed tube steel shell test section of the submarine tunnel started

December 2018, 9

The pile foundation of the main pier of Lingdingyang Bridge and Zhongshan Bridge was drilled at the same time, and the bridge project was officially started

December 2019, 6

The first section of the immersed tube steel shell of the submarine tunnel was manufactured (the project built the first large-scale steel structure intelligent manufacturing production line in China), and it was transported to the world's largest immersed tube prefabricated smart factory for pouring (self-developed steel shell concrete intelligent pouring equipment and control system, and the pouring quality is internationally leading)

December 2019, 7

The steel gondola of the east tower of the Lingdingyang Bridge has been completed

December 2020, 6

With the help of the world's first immersed tube floating installation integrated ship, the first immersed tube E1 pipe section completed the sinking installation and realized the "first kiss in the deep sea"

December 2020, 9

The excavation of the foundation pit of the east anchorage of the Lingdingyang Bridge was completed

December 2021, 6

The east main tower of Lingdingyang Bridge was capped

December 2021, 7

The west main tower of Lingdingyang Bridge was capped

December 2021, 8

The first section of immersed tube E32 at the east end of the immersed tunnel completed the sinking docking, creating a new situation of synchronous installation at the east and west ends, and breaking the world record of ultra-wide and variable-width immersed pipe sections in floating installation

December 2022, 2

Lingdingyang Bridge pilot cable across the river

December 2022, 4

Lingdingyang Bridge catwalk through

December 2022, 5

The erection of the first main cable strand of the Lingdingyang Bridge was completed

December 2022, 6

Zhongshan Bridge Helong

December 2022, 9

The Lingdingyang Bridge completed the erection of the main cable strands

December 2023, 1

The erection of all box girders for the offshore non-navigable hole bridge of the Shenzhong Passage has been completed

December 2023, 1

The first steel box girder of the Lingdingyang Bridge was hoisted

December 2023, 4

Lingdingyang Bridge Helong

December 2023, 6

The E23 pipe section and the final joint of the submarine tunnel were sunk and docked, and the immersed tunnel was closed

December 2023, 6

The main structure of the East Artificial Island was completed

December 2023, 11

The main line of the Shenzhong Passage runs through

(Shenzhen Special Zone Daily)