The latest development of the longest sea-crossing subway in China! Haibo Bridge Station of Qingdao Metro Line 1 to Shuiqing

On December 8, as the "sailing date" (hard rock tunnel boring machine) huge TBM cutter head burst through the wall, by the China railway construction of China railway shisiju group construction of Qingdao metro line 1 between mooring bridge station to sea water ditch cleaning station of the left line, all marks across the most dense fracture zone domestic subway TBM tunnel and the first subway TBM tunnel continuous transport system through smoothly.

The tunnel strata through this time are mainly breezy granite with a hardness of more than 100 mpa, and 77 pieces of water-rich sand and gravel are mixed with each other at the same time, just like "stones mixed with eggs". It is one of the projects with the most frequent soft-hard conversion and the largest geological intensity comparison among similar tunnels in China.

According to reports, the fracture zone is the natural enemy of TBM construction, and a slight mistake may bring serious accidents such as ground collapse, machine jamming, tilt of ground buildings, pipeline damage, etc., with extremely high construction difficulty coefficient.

At Qingdao city housing and urban and rural construction bureau of municipal services and regulation, and China railway construction headquarters in Qingdao subway company, under the support of the construction team to actively carry out scientific research and innovation by cutter parameter optimization and advanced geological monitoring, fracture zone grouting treatment, "remote monitoring system" and so on many measures, strictly control the parameters, the reclamation of gravel, the wall after grouting, successfully conquer mixed geological problem.

In the construction of the interval from Haibo Bridge to small village of Qingdao Metro Line 1, the strata passing through are mainly breezy granite with very hard geology. The builders used TBM for the construction of hard rock. After the accumulation of construction experience of Qingdao metro, when the earth-pressure balanced shield tunneling machine is used for hard rock tunneling in the future, the construction experience of shield tunneling machine and TBM can be effectively combined, and the tunneling construction of shield tunneling machine can be optimized and the construction efficiency can be improved by taking the construction parameters and cutter configuration of TBM as reference. It will also provide technical experience support for subway construction in other cities in Shandong province.