The first shield cable tunnel in Northeast China passed acceptance

Correspondent Hou Jiabing Li Juan

Recently, the cable tunnel project constructed by the Northeast China Railway Seventeenth Bureau and the second company, which was constructed by the China Railway 17th Bureau, successfully passed the acceptance of the operation of the cable tunnel project of Shenyang Shengjing to the Qijiang Cable Tunnel in Shenyang, and achieved operating conditions to inject new momentum into the revitalization of the Northeast Old Industrial Base.

The tunnel penetrates the scene

The total length of the Shenyang Shengjing to the Luanjiang Cable Tunnel is 5.54 kilometers in length. It is the largest investment scale in the history of Liaoning Power Grid. After the completion of the operation, the power supply capacity of the eastern area of ​​Shenyang can be increased from the original 1.5 million kilowatts to 3.5 million kilowatts, which has effectively promoted and supported the long -term development of the Shenyang Economic Zone. The company undertakes the construction of the construction of the project with a total length of 3.244 kilometers. It is constructed by the shield method. The interval tunnel has multiple risks such as high -voltage electric tower, high bridge, freight railway and other risk sources. The complex geology such as granite and gray green rocks is below the groundwater level, which brings severe challenges to construction.

Wisdom empowerment completes high difficulty crossing

Since starting May 12, 2019, in the face of complex and changeable geological conditions and the excavation lines of continuous small curve radius, the project has held a seminar on design and construction plan many times to sort out and analyze the risk sources. By optimizing the construction plan and along the tunnel line The surface settlement and encryption monitoring, the encryption of control points in the tunnel, accurately control the posture of the shield machine, and accurately complete the pipe assembly. At the same time, in response to the characteristics of the shield construction, the project conducts remote management of the shield construction through the video monitoring room, and the dispatching personnel immediately issue instructions by viewing real -time video. On the other hand Fiber transmission, sharing with the ground, avoid long -distance tunnel information communication delay, achieve overall coordination command, and finally complete the difficulty through the difficulty.

Technical blessing Promoting efficient performance

In the construction of the tunnel, in order to prevent the mud from surging, the project introduces polymer polymer materials, and through repeated simulation tests, the slag becomes sticky under the adsorption and isolation of the foam mixture and polymer polymer. Make sure the spiral machine is uniform and smooth when the soil is discharged. In the process of excavation of the shield machine, the project strictly controls the amount of territory according to the actual pressure of the spiral machine, the torque and thrust of the blade, and the pressure of the soil compartment in time to make the soil pressure slightly higher than the water pressure to ensure that the shield machine passes smoothly through the passing machine. The rich water -rich layer has become the first unique participating unit in the entire line.

Fine planning to create a "precision" benchmark

Internal tunnel

In order to ensure the smooth out of the hole in the shield machine, the shield tunnel adopts a dual -branch wire and introduces the directional measurement of the gyroscope to accurately locate the cave door steel ring and the receiving frame. After the shield machine is broken, after the actual measurement of the on -site measurement personnel, the setting of the axis and vertical deviation of the setting center and the shield tunnel design center is controlled within 10 mm. The deviation is within 5 cm, and the axis level and vertical deviation of the axis and vertical deviations are more accurate during acceptance. "Create the" accuracy "benchmark belonging to China Railway Construction on the entire line. Shield construction has accumulated valuable experience.

- END -