The right line between Jiangling station and Jingjiashan station of Nanchang metro line 3 was successfully completed

Late October 27, as China railway 491 # of shield machine cutter from jiangling station north slowly burst through the wall, nanchang subway line 3 between home mountain jiangling station to Beijing station right line is smooth, on the morning of October 28, shield machine slowly on receiving plane, nanchang subway line 3 line between home mountain jiangling station to Beijing station right shield security received smoothly.

Between home mountain jiangling station to Beijing station right line length of 1487.565 m, the total length of 1488.388 m of the left line, a north-south, tunnel overburden soil thickness 8.9 ~ 19.8 m, 1200 m minimum curve radius, the maximum longitudinal grade 25 per thousand, set up two connecting passage, out of the house of Beijing mountain stand along the yingbin road heading south of Peking University, after the side wear build a province JiZiFang, hardware factory dormitory, jiuzhou station viaduct and shops along the street after entering the jiangling, range across the water on the sand, soft hard formation and whole section argillaceous siltstone under complex strata, such as the layer above the tunnel at the same time there are large diameter concrete pipes and large cross-section rain sewage box culvert, The safety risk is high, the construction difficulty is big.

Interval through DN1400 concrete pipes and variable cross-section masonry are major risk source, rain sewage box culvert DN1400 water supply pipe for qingyun spectrum zone and nanchang county main water supply pipe, variable cross-section box culvert, structure condition is poor, very long time only 5 m or so, the minimum vertical distance and the tunnel will produce serious consequences once leaks, crew felt safe responsibility is significant. In view of the above difficult point, project department developed detailed specific solution of shield construction, decomposition of the various tasks in detail, set up multiple layers of security defense line control: one is that in the process of shield tunneling contrast analysis of the various parameters in time, in accordance with the requirements of shield synchronous grouting and secondary fill slurry and hole grouting reinforcement, and strengthen monitoring; Secondly, radar scanning was carried out on the upper part of the tunnel in order to timely grasp the formation compaction condition under the road and the safety condition of the box and culvert. Third, in the upper soft and the lower hard stratum, the road warning signs should follow closely, the monitoring data should be monitored in real time, and the inspection should be done in a crouch spot for 24 hours. Besides, the grouting machine, grouting materials and other emergency equipment and materials should be prepared along the line.

Through careful planning, scientific organization and strict implementation of various requirements, the site project department successfully achieved the goal of transiting the right line between jiangling station and jingjiashan station. In the following work, all the staff will, as always, adhere to high standards and strict requirements, speed up the construction progress, and continue to strive to achieve the opening and operation goals of line 3.