The longest underground tunnel across the Qiantang River in China

On the morning of September 14, after 408 days of day and night, by the China railway 16th bureau group construction of hangzhou metro line 8 heavy difficulty controlling engineering - text between wind Wells to bridgehead between bridge station of shield tunnel smooth, marked the domestic single hole of large diameter double shield crossing the qiantang river is the longest distance major breakthroughs were made in the subway tunnel construction, for the Asian games in 2022, hangzhou completed before operation and laid a solid foundation.

The first phase of Hangzhou Metro Line 8 is the east-west backbone express line, which is the key supporting project of Hangzhou Asian Games. It has great significance and wide influence. At the beginning of 2018, China Railway 16th Bureau Group, relying on its brand core technical advantages of rail transit and underground engineering and its profound accumulation in many difficult shield construction projects, undertook the sG8-2 bidding for the first phase of Hangzhou Metro Line 8. The project mainly consists of one station and one section, among which the air shaft of Wenqiao section is the deepest and widest underground station in the whole line. At present, the main structure has been completed and handed over smoothly.

As a full-line "throat" project, the shield tunneling from the air shaft of Wenqiao station to Qiaotou Station is 3,466 meters in length, among which the section crossing the Qiantang River is 2,800 meters long, which is the longest subway tunnel crossing the Qiantang River in China at present, setting a record for the longest subway crossing the River in Zhejiang province. The project adopts the 11.71 meters of domestic large diameter slurry balance shield tunneling construction, tunnel passing through areas complex geological structure, shield from receiving shallow overburden soil, need long distance across the qiantang river is high water pressure permeable stratum, side in university dormitories, wear under ultrahigh pressure of oil and gas pipeline, the elevation change big qiantang river levee, and other major risk source, high leakage risk, safety risk is big.