On the 7th, the reporter learned from Jinan Urban Construction Group that the Wangsheren Station and the Wangsheren Station–Peijiaying Station section of Jinan Rail Transit Line R3, undertaken by Jinan Urban Construction Group Co., Ltd. under the group, have completed the pre-Spring Festival construction tasks as scheduled. The right line of this section is expected to break through in October this year, and the left line in November. This is also the first Jinan metro construction project undertaken by a local Jinan enterprise.
Jinan Rail Transit Line R3 is the second line to start construction in Jinan's rail transit network. It connects the Olympic Sports Center area, the Central Business District, the Jinan East Railway Station area, and the Yaoqiang Airport area, and is an important line for building a north-south rapid passenger transport corridor. Among them, Wangsheren Station and the Wangsheren Station–Peijiaying Station section in Section V of Line R3 are undertaken by Jinan Urban Construction Group Co., Ltd. under Jinan Urban Construction Group. This shield-tunnel section is currently the longest underground section on the entire Line R3.
A relevant person in charge of Jinan Urban Construction Group Co., Ltd. introduced that as of now, the right-line construction has completed 900 rings in total (one segment ring ≈ 1.2 meters), completing 38.78% of the project volume; the left-line construction has completed 600 rings in total, completing 26.04% of the project volume. The right line of this section is expected to break through in October this year, and the left line in November.
The above-mentioned person in charge introduced that during the shield construction of the Wang–Pei section, there are many risk sources and the construction is highly difficult. On Gongye North Road, the tunnel needs to pass beneath complex municipal pipelines on Gongye North Road, among which the maximum burial depths of steel hot water pipes are 2.60 m and 2.63 m respectively. Shield construction is required to ensure continuity of construction so as to effectively control later settlement and ensure the safety of structures; the construction difficulty is therefore quite prominent.
The reporter learned that the shield construction in this section passes alongside a total of 48 pile foundations of the Gongye North Road expressway, 5 of which are Level II risk sources. In addition, the shield machine in this section will also pass through a sharp turn with a radius of only 700 meters; on the plan view, the curvature is close to a right angle.
To complete the shield's side passage past the pile foundations of the Gongye North Expressway ramp bridge, with a minimum horizontal clear distance of only 1.3 m from the pile foundations, requires full cooperation among construction personnel. The shield operator needs to strictly control main tunneling parameters such as advance speed, grouting volume, and muck discharge, and promptly correct them when abnormal trends appear, so as to ensure normal shield advancement. The above-mentioned person in charge said that after the "Fenjin No. 1" shield machine completed the side passage past the pile foundations, the cumulative variation at ground monitoring points measured by construction monitoring was only 0.75 mm, basically achieving "zero settlement."
In the future, a single crossover line will also be built between the two lines at Wangsheren Station. In case of an emergency, vehicles can use the crossover to turn back between the two tunnels.