The picture shows the construction of engineering ships in the deep-middle passage
In order to promote the construction of domestic infrastructure, China has built a large number of construction machinery, of which this super engineering equipment can be called a subsea vacuum cleaner! Its birth means that China has 1 more deep-sea weapon, and this super engineering instrument has finally been built! Can be dug 40 meters deep under the seabed for the construction of the seabed project escort, crazy suction out of the seabed silt, such engineering equipment can be called the seabed vacuum cleaner, and now China has built a deep-sea weapon, in the end how to do it?
The figure shows the deep middle channel planning diagram
In order to connect Zhongshan City and Shenzhen City in Guangdong Province, China decided to build a super project in Guangdong Province: Shenzhen-Zhongshan Passage, which starts from Bao'an District of Shenzhen City to connect Zhongshan Hengmen Hub, after the successful construction of the project, the traffic time from Zhongshan City to Shenzhen City will be shortened to 30 minutes, which can greatly reduce the traffic pressure of Humen Bridge, so that Zhongshan City and Shenzhen City two cities become an important part of the half-hour traffic life circle, accelerate China's economic development speed. Of the 24-kilometer project, 6.8 km consists of immersed tube tunnels.
The so-called immersed tube tunnel, in fact, is a way to build a submarine tunnel, the entire tunnel is composed of a large number of prefabricated sections, after being transported to the site, it is sunk into the water and installed in the foundation groove that has been laid to form an underwater tunnel, which is not only more cost-saving, but also easier to ensure the construction quality of the tunnel, so it has become the mainstream in the world.
The picture shows the Jielong wheel
But this construction method has a premise, that is, the need to dredge the seabed in advance to create a submarine tunnel base trough, and then squeeze the dense sand pile, and finally lay a stone "mattress" on the machine trough, so that it can effectively control the settlement of the submarine immersed pipe, so as to ensure the safety of the entire tunnel, and the "Jielong" ship is China's first dredging special ship specially built for this project, in fact, the deep channel is not the first time that this dredging ship has been put into the construction of the national project This ship has already made its own outstanding contribution to the construction of the China-Hong Kong-Zhuhai-Macao Bridge, but due to the higher difficulty of the deep-middle passage of this construction, the "Jielong" ship specially carried out a two-year "retreat cultivation", in which it improved its technical level by breaking through a series of technical problems.
After the completion of the transformation, the silt absorption performance of the Jielong wheel has been increased by a full three times, it can suck up the water of 4 standard swimming pools in an hour, after the modification of its bridge frame, the digging depth can reach 40 meters, equivalent to the height of the entire 13 floors, and its construction accuracy has also been greatly improved, the error elevation control error of the dredging head during the construction process is controlled in the centimeter level, the reason why such a high accuracy is needed is because the steel sealed doors are installed at both ends of the immersed pipe that settles to the seabed. These steel gates play a role in preventing seawater from entering the tunnel of watertight doors, if the dredging machinery touches these steel seal doors during the construction process, the light will cause the steel seal door to deform, and the heavy will break into the water, which is a fatal threat for the entire project.
With the assistance of Jielong Wheel, the tunnel construction project of the Deep-Middle Passage is steadily underway, the current tunnel laying length has exceeded 618 meters, and it is expected that the fifth link will be installed in November, and jielong Wheel will inevitably continue to escort the project and even subsequent projects until the Chinese engineering team has issued more advanced equipment to replace it.