Qingdao metro line 4, li 9 section, "fushan" TBM successfully started

At 10:58 on November 30, with the roar of firecrackers, the second TBM "fushan" of Qingdao metro line 4 civil engineering area of China railway construction bridge engineering bureau group co., ltd. was successfully launched, marking the beginning of the second journey of tunneling in lijiu section of Qingdao metro line 4.

The civil engineering zone 10 of Qingdao metro line 4 was contracted to construct the jiushui east road station and four sections, with a total length of 5.5km. The section tunnel was constructed by TBM method/shield method + mine method.

The first right line "laoshan" TBM was launched on June 1, 2019, and has been tunneling for 457 meters. During the tunneling process, it passed through an ultra-long broken zone of 84 meters, which brought many difficulties to the tunneling construction.

Face many obstacles, metro group lines in Qingdao company, under the guidance of the project team please make plan, experts, using surface grouting hole, hole to consolidate a variety of ways, such as success through the fracture zone, and the reasonable coordination crossover operation, successively completed the station six roof construction, medium plate, five paragraphs provide important guarantee for the second stage TBM starting.

The "fushan" TBM is ZTT6470 in the form of double shields, manufactured by China railway construction heavy industries group co., LTD. The equipment is characterized by high safety factor, fast construction speed, small impact on surrounding geology, small damage to surrounding rocks, and small vibration and noise, which can effectively reduce the impact on surrounding residents and structures, according to shang jiujun, executive manager of civil engineering section 10 of China railway construction bridge bureau.

According to the requirements of Qingdao metro group, the departure will be made at the end of November and completed on schedule. It guarantees the time limit and creates favorable conditions for later construction.

It is understood that the total length of the equipment is 155 meters, the diameter of the cutter is 6.3 meters, the number of main push cylinders is 12, the number of torque cylinders is 8, the number of auxiliary push cylinders is 30, the driving mode is electric frequency, the number of driving motors is 6.