Hong Kong-Zhuhai-Macau Bridge artificial island. The artificial island adopts the world's first deep-inserted steel cylinder rapid island technology, which consists of 120 giant steel cylinders. Each cylinder is 22.5 meters in diameter and more than 50 meters in height.

The world's largest prefabricated factory, the rapid sea island in the sea, the first open curve immersed pipe prefabricated first river, the tunnel pipe joint sinking and docking, the super long steel bridge deck pavement... From the moment of construction, the Hong Kong-Zhuhai-Macao Bridge is continuously creating the world "The Hong Kong-Zhuhai-Macao Bridge is another major infrastructure project in China after the Three Gorges Project and the Qinghai-Tibet Railway. It is also the "super project" with the most complex technical trees, the highest environmental protection requirements and the highest construction standards in the history of bridge construction in China. It also marked a new height for China's engineering construction.

33 knots of giant immersed tube bottom 40 meters "romantic kissing"

During the construction of the Hong Kong-Zhuhai-Macao Bridge, there is an island tunnel project with a total length of more than 7 kilometers. In the deep seabed, which is more than 40 meters deep, dark and turbulent, it realizes 33 immersed pipes like the carrier of the aircraft carrier. The docking accuracy must also be controlled at the millimeter level, which is all compared to the bridge builder as "neering in the wind".

What is the "immersed tunnel"? It is to pre-drill the trenches on the seabed, and then lay the gravel as a bed. Pre-fabricate a section of the immersed pipe in the factory, transport it to the location where the tunnel needs to be paved, sink it on the bed and assemble it in turn. Into the tunnel. The Hong Kong-Zhuhai-Macao Bridge submarine immersed tunnel consists of 33 large immersed pipes. Each immersed pipe has two holes and one pipe. It is about 180 meters long and weighs about 80,000 tons, which is equivalent to the weight of an aircraft carrier. It is necessary to complete such a precise immersion pipe at 40 meters on the seabed, and it is still completed under the busiest navigation waters of the ocean. The difficulty of control can be imagined.

On May 2, 2017, the final joint of the sinking pipe that was related to the success of the Hong Kong-Zhuhai-Macao Bridge began to be installed.

According to the design, the joint is between the 29th and 30th immersed pipes at a depth of about 28 meters on the seabed. “Considering wind, ocean current, buoyancy and other factors, the error is only allowed to be within 1.5 cm.” Lin Ming, general manager and chief engineer of the Hong Kong-Zhuhai-Macao Bridge Island Tunnel Project, said, “This is unprecedented in the world of transportation.” On the ocean, a 300,000-ton oil tanker was transformed into the world's largest single-arm full-rotation crane, the "Zhenhua 30". Its "arm force" reached 12,000 tons, twice the weight of the tunnel joint. After sufficient planning and careful preparation, at 22:30 on May 2, the final joint of the immersed tunnel was successfully installed after more than 16 hours of hoisting and sinking, and achieved millimeter precision docking.

From the first section of the E1 immersed tube on May 2, 2013, the floating installation was completed, and the final joint installation was completed on May 2, 2017. During the construction of the four-year immersed tunnel, the builders struggled to overcome the deep water deep trough and large World-class problems such as runoff and strong back silting have overcome the challenges of severe meteorological environments such as strong typhoons, creating a speed of China from "the first immersive 96-hour battle" to "one-year ten", "continuous within half a month." The installation of two immersed pipes, "limit 3 mm docking deviation", "final joint millimeter deviation" and other items of shocking record, successfully completed 33 sections of giant immersed pipe and final joint installation and construction tasks, creating a sea sink The tunnel tunnel drip does not leak the construction miracle.

Two artificial islands started construction in the same year.

To connect the bridge at sea with the tunnel at the bottom of the sea, an island is needed to make the transition. However, there is no such island to be used on the sea. The only solution is to build an artificial island. This is the origin of the two artificial islands on the east and west of the Hong Kong-Zhuhai-Macao Bridge.

The two artificial islands in the east and west serve as a traffic complex connecting the bridges and tunnels, and integrates 10 functions such as tunnel ventilation and smoke exhaust, tunnel bridge electromechanical support system, and disaster prevention and rescue. At the same time, as the most ornamental location of the Hong Kong-Zhuhai-Macao Bridge, the two artificial islands have been given the identity of “landmark buildings” on the bridge. The East Island has the functions of tourism and commercial exhibitions.

The mud at the bottom of the waters of the two artificial islands is very thick. To build an island on the silt, the traditional practice is to clean up the silt first. In this case, the amount of work is very large and it will cause great damage to the marine environment. Therefore, the construction of the artificial island adopted a new deep-inserted steel cylinder to protect the rapid island: a group of steel cylinders (each steel cylinder 22.5 meters in diameter, 50 meters high, weighing more than 500 tons) inserted into the seabed In the depths, it is fixed on the seabed, surrounded by a circle, and then filled in the middle to form an artificial island.

In January 2011, the offshore reconnaissance survey and the piling operation of the West Artificial Island survey platform were launched. The island tunnel project officially opened the prelude to offshore construction. On May 15th, the island tunnel project ushered in the first important node of offshore construction: in the sound of the rumbling vibration of 8 linkage vibrating hammers, the first super-large steel cylinder of the island artificial island in the island tunnel project shook into the sea. On August 27th, the construction record of “three simples a day” was realized. In just a few months, it created a record of "four days and eight cylinders". On December 7 of the same year, the construction of the last steel cylinder of the East Artificial Island and a total of 120 steel cylinders was completed, creating the engineering miracle of “Starting in the same year and becoming an island in the same year” and showing the “China Speed” to the world. .