The left line of Nanning metro line 5 is smoothly completed

Recently, as the concrete portal at the receiving end of jinqiao passenger terminal slowly fell down, the cutter plate of no.187 shield machine appeared in everyone's sight. In the scene of enthusiastic cheers, nanning rail transit line 5 construction site again from the good news, by the construction of the fifth engineering bureau co., LTD. Contracted by the "jiangqiao station - jinqiao passenger station" section of the left line tunnel smoothly through.

This area is mainly laid along kunlun avenue, which is the main urban trunk road and roughly runs east-west. The length of the left line tunnel in the interval is 904.1m, and the minimum radius of the curve is 450m. The buried depth of the line is 1.5m ~ 17m, and the maximum vertical slope degree of the interval is 28‰. The earth pressure balance shield machine with diameter of 6.28 meters was used to carry out the interval driving task.

Shield tunneling machine has passed through 110KV high voltage tower, jiangqiao market pedestrian bridge, main stream and tributary of nakao river. The tunnel tunnel body has poor geological conditions and frequent changes, making construction extremely difficult. Project has invited industry special held a special analysis, formulate special construction plan, emergency plan, strengthen monitoring and tunnel in the process of synchronous grouting and secondary grouting, cooperated-builing parties during shield crossing the risk source manned 24 hours a day, and in view of the risk source real-time optimization of tunneling parameters, strengthen management, each process strictly implement the company "six systems", ensure the safety of the whole construction.

Starting from May 18, 2019, the left line of the gold lowering interval has been tunneled for 130 days and nights. After passing through multiple risk sources, it has overcome numerous difficulties, assembled and formed 603 rings of pipe pieces, successfully arrived at jinqiao passenger station, and completed the company's breakthrough construction node on time.