Guangzhou metro line 7 west extension section successfully overcame a major construction risk source

Recently, the shield of the left line between beijiao new town station and midea avenue station of the first phase of the west shunde section of guangzhou metro line 7 has successfully crossed the linxi river channel, which means that this major construction risk source in this area has been successfully overcome.

Construction difficulties

The shield to cross the linxi river is about 350 meters in length, about 20 m turns the soil, and the linxi river channel below the main geological for silt soil, mostly muddy silty sand and silty sand layer, so the underground confined water, sand fluidity big, formation after disturbance, liquefied extremely easily, can produce larger soil loss, caused the ground uneven settlement, may even lead to breakdown river water road, ground subsidence, and so on and so forth.

The above factors bring great risks and difficulties to the shield construction. However, under the correct guidance of shunguang company, the project department of standard 04 combined with the hydrogeological characteristics of the project, conducted the selection of shield equipment and the targeted strengthening of shield design demonstration in advance, and formulated the special plan for crossing the river and passed the expert review.

Before crossing the linxi river, shunguang company also organized and held a special meeting with the project department to prepare for personnel disclosure, equipment maintenance, material reserve, etc. During the construction process, the river surface shall be monitored and inspected 24 hours a day. The professional technicians of shield tunneling in the construction line shall take turns in shifts 24 hours a day and stick to their posts to ensure the smooth and continuous construction of shield tunneling during the crossing of the river.

The shield tunneling successfully crossed the linxi river, which fully demonstrated the "steel" spirit of shunde metro people "to march forward and persevere", and provided construction experience for major risk sources such as crossing the river and building structures in the west extension of shunde section of line 7. In the next step, shunguang company will lead all the standard projects with a serious and rigorous working attitude, continue to strengthen risk control, ensure the completion of the project construction tasks with high quality, high efficiency, safety and reliability, and make contributions to the construction and development of shunde railway with practical actions.