New progress on "World's Widest"! Complete installation of 1/4 immersed tube tunnel for deep and middle passage

On March 22, guangdong traffic group news, 21, afternoon 3 when, after nearly 27 hours of continuous operation, a large bay area of guangdong core immersed tube tunnel engineering pressure-pad-force channel 8 a socket (E8) precision docking, 36 meters underwater, thus pressure-pad-force channel island tunnel engineering immersed tube tunnel has been built 1278.5 meters, the total length of heavy section a quarter (5035 meters).

The E8 pipe section installed this time is a standard pipe section, 165 meters in length, 46 meters in width, 10.6 meters in height, weighing about 80,000 tons. The sinking position is close to the deepest point of the whole line, and the construction of deep water and deep groove is complicated and difficult.

At the same time, E8 pipe joint is also the first submerged pipe in the deep and middle channel that selects floating transportation during the day, mooring at night and docking during the day. "The main reason is that the ionosphere is at the most active stage during the docking in the daytime, which may easily lead to the risk of signal instability or even loss of lock, which will have a negative impact on the control and installation accuracy during the docking of pipe joints. We will introduce the Beidou positioning system and strengthen monitoring to ensure smooth docking."

At about 3 PM on the 21st, after nearly 27 hours of continuous operation, the E8 pipe joint was successfully connected. Through the through-through measurement, the butt deviation of E8 pipe joints is within 50 mm, which meets the acceptance control standards.

The 24-kilometer Shenzhen-Central Corridor is scheduled to open to traffic in 2024. The undersea tunnel is about 6.8 kilometers long, and the submerged tube section is about 5 kilometers long. It adopts the steel shell concrete composite structure, which is first used in China and first used in the world on a large scale. It is composed of 32 pipe sections and 1 final joint, making it the widest submerged tube tunnel in the world at present.

Song Shenyou, deputy director and chief engineer of the Shenzhen-China Channel Management Center, said the next step will be to prepare for the installation of the E9 pipe section, which will be installed at a depth of about 40 meters, the deepest in the whole line. According to the plan, the first pipe section on the east side of the project immersed tube tunnel will be immersed and lowered in August this year, which is the first ultra-wide variable width pipe section immersed and lowered in the whole line, with high technical difficulty.