today! The main line of Quanzhou Chengdong Beifeng expressway is opened to traffic in two directions

At 8:58 a.m. this morning, with the removal of the red enclosure, the vehicles from the east of the city to Beifeng express channel to Beifeng drove through the right line of wutaiwei tunnel under the guidance of the iron cavalry team of Fengze traffic police brigade. So far,Wutaiwei tunnel, the most important control node and key and difficult project of Quanzhou Chengdong Beifeng Expressway and shanty town reconstruction PPP project on both sides invested and operated by Longyuan construction group, has realized two-way trial traffic, marking the realization of two-way six lanes on the main line of the channel.

The PPP project of Chengdong Beifeng Expressway and shanty town reconstruction on both sides invested, constructed and operated by Longyuan construction group is the representative of the group's municipal projects serving the whole life cycle, with a total investment of 3.973 billion yuan and a total length of 7.215km, including 2 main line tunnels, 1 gate tunnel, 3 viaducts, 3 interchanges and 6 ramp bridges, It is a large-scale traffic project with tunnel engineering.

An important part of the project - Chengdong Beifeng wutaiwei tunnel, with a total length of 1.21 km, is a left-right line separated variable section tunnel. The technical standard is two-way 6-lane urban expressway (4-lane entrance and exit section). The maximum excavation section span is 23 meters. It is the largest concealed tunnel under the same operating conditions in China. Nearly half of the tunnels belong to ultra shallow buried depth (the minimum buried depth is 5m). For super large section tunnels, too thin soil cover is very easy to cause collapse and roof fall during construction. During the overall design of the tunnel, its line shape needs to avoid the planned control line of Qingyuan mountain 5A scenic spot. Quanzhou prison is on the west side of the entrance and Caobang reservoir is on the east side. The entrance and exit of the tunnel need to avoid important facilities such as civil air defense. The design and construction conditions of the whole tunnel are very difficult.

During the construction process, the project department faced many difficulties: one roof fall of 30m, countless small landslides, two settlements of 30cm per day, a cumulative settlement of more than 60cm, and a cumulative arch replacement of nearly 100m. Auxiliary measures and construction methods such as deep well dewatering, curtain splitting grouting, anti slide pile, pipe shed in the tunnel, reserved core soil for steps, central partition wall after reserved core soil for steps and central partition wall have been used once. After several rounds of on-site meetings, changes and expert argumentation,stayGroup leaderofWith the support of the project management teamAnd itemAll the workers in the project department are deployed at the top and arranged at the bottom, and the top and bottom work together to ensure the quality、Ensure safety and promotion,克服了復雜of地質條件、新冠肺炎疫情影響，緊湊安排工期，班組日夜加班施工作業(yè)，歷時三年多，終于如期完成通車任務。

After the two-way trial opening of wutaiwei tunnel,meaningtasteThe whole North Peak is connected quicklyThe main line of the road is open to traffic in both directions,Quanzhou bullet train station is only 8 minutes away from the central urban area, right加強東海、城東、北峰等片區(qū)of快速聯系具有重要meaning義。