The left line of shield section between fenglehe road station and yulan avenue station on line 4 of hefei rail transit is connected

Recently, the construction of hefei rail transit line 4 has made new progress. On December 24, the left line of fenglehe road station and yulan avenue station was connected, which became the 36th single-line tunnel of line 4. On December 30, the double-line shield tunneling machine from science avenue station to qimen road station passed through hewu railway and hefu high-speed railway.

The left line between fenglehe road station and yulan avenue station is laid along xiyou route from west to east, with a total length of 1473.56 meters. The shield tunneling machine starts from yulan avenue station and receives from fenglehe road station. During the tunneling period, the shield tunneling machine penetrates important municipal pipelines such as sewage and gas, sideways important structures and passes through isolated rock strata in dazhu mountain range, which makes the construction difficult.

The shield of the left line of interval since drivage construction on May 28, 2019, the city rail group led all the contractors to carry out the city rail transit construction engineering safety quality, civilized construction, prevention and control of atmospheric pollution and so on each work requirements, constantly optimize the construction organization, strict implementation of the construction plan, has overcome the earthwork sinotrans and a series of difficulties, eventually achieving line 4 "toyotama shield interval of the left line through."

The shield section of science avenue station ~ qimen road station is laid eastward along xiyou road, with a total length of 1582.914 meters. During the construction process, the shield tunneling machines of the left and right lines all went down the existing hewu and hefu high-speed railway lines, and there were 4 railway concrete sleeper and gravel road beds. In the process of downcrossing, the speed limit of all trains runs, the construction process is difficult, the settlement control requirements are high, the construction risk and environmental risk are high, which belong to the first level risk.

Between the shield tunneling construction process, the city rail group leaded the contractors adhere to the "safety standardization, quality standardization, scientific progress, civilization construction norm" as the gripper, elaborate organization, scientific planning, strict control of driving parameters and grouting quality, use of automatic monitoring equipment real-time guide the construction of the tunnel subsidence, subgrade and track subsidence monitoring, excavation parameters of shield machine, etc. As a key control project. The safe and stable construction of shield tunneling machine in this area has accumulated rich experience for the subsequent construction of shield tunneling under the existing high-speed railway line.

At the 31 stations of CRC line 4, 22 stations have completed the capping of the main structure, 34 shield tunneling machines have been installed, and 33 shield tunneling machines have been lowered into Wells, accounting for 65% of the total amount of shield tunneling projects.