The second shield of hangzhou Metro Line 9 at the 3 mark "Sanyu" section started off smoothly

On October 17, with the slow rotation of the knife plate of the shield tunneling machine "Qixin 2", the shield tunneling machine of the left line of hangzhou Metro line 9, from No.3 Zhaisanbao station to Yudao station, started smoothly, which was the second shield tunneling machine after the shield tunneling machine of "Qixin 1" made 400 rings smoothly.

The starting interval is the left line of the interval from Sanbao Station to Yudao Station. After leaving the negative third floor of Sanbao Station, the interval line is laid from southwest to northeast along Qianjiang Road, passing through Qianjiang Road tunnel, descending through Hangshen Railway, Shanghai-Kunming High-speed railway, No.2 Qianjiang Bridge of Shanghai-Kunming Railway, and Connecting with Yudao Station after the Shanghai-Hangyong expressway bridge, with a total length of 906.036 meters. It successively passes through complex strata such as sandy silty soil, silt clay and local riprap, etc. In addition, it is constructed in riverside rich water for a long distance, with many technical control measures and great difficulty. In order to ensure the smooth start-up of the shield tunneling machine, the shield construction team summarized the experience of the first shield tunneling, made advance planning, optimized resource allocation, and formulated a safe and efficient shield tunneling guarantee plan. On the basis of the great difficulty of vertical grouting of the cave door, measures such as horizontal grouting of the cave door, protection pile of the cave door, strengthening the precipitation management of the end well, strengthening the reaction system and so on are actively added, which provide strong technical support for the smooth starting of the shield in the sandy land layer.