The second section of Jiaozhou Bay Undersea Tunnel of Qingdao Metro Line 1 passed the acceptance inspection

On September 17, the second section of Jiaozhou Bay Undersea Tunnel of Qingdao Metro Line 1 passed the acceptance inspection successfully, becoming the first unit to pass the acceptance inspection of the south section of Qingdao Metro Line 1 and obtaining the most important "pass" before the opening, laying a solid foundation for the implementation of the opening trial operation.

Jiaozhou Bay undersea Tunnel of Qingdao Metro Line 1 is the deepest undersea tunnel in China, the first cross-sea subway in mainland China, and the longest subway tunnel in China that runs through the most fault rupture zones. The tunnel's longitudinal slope is shaped like a "V", and its deepest point is about 88 meters from the sea level. The water pressure above the tunnel is at least 8.8 kilograms per square centimeter, which is equivalent to the pressure of 300 cars per extended meter of the tunnel.

The second section of The Wagui section is 3.33 kilometers long, with 1857 meters of sea area and 1474 meters of land area. The tunnel is about 150 meters east of the existing Jiaozhou Bay Highway tunnel. It starts from Huawuzhuang Station in Xuejajao, new District of The West Coast, goes through the sea area at the mouth of Jiaozhou Bay, and then reaches Guizhou Road station via Tuandao. It is the most important control project of Qingdao Metro Line 1.

The construction unit, design unit, survey unit, supervision unit, third-party testing unit, third-party measurement unit, third-party monitoring unit, construction unit and operating unit shall form a joint acceptance group for this acceptance. Qingdao Municipal Engineering Quality and Safety Supervision Station shall carry out the completion acceptance supervision and implementation as the supervision institution. The construction, survey, design, construction, supervision, testing and monitoring units reported the performance of the project contract and the implementation of laws, regulations and mandatory standards in each link of the project construction; The acceptance group inspected the project quality on the spot, reviewed the project data, all the conditions met the relevant design and specification requirements, and signed the unit project acceptance advice, successfully passed the acceptance.