The shield machine in chengda section of hefei rail transit line 4 successfully passed through the pile group of north-south no.1 viaduct

On October 29, the shield machine on the right line between chengkan road station and daqiang road station on line 4 of hefei rail transit successfully crossed the pile group of the north-south no.1 viaduct, indicating that both the left and right lines of the shield section safely crossed the pile group of the north-south no.1 viaduct.

Is road station ~ big strong road station shield interval distance between the north and the south one viaduct bridge, bridge pile foundation the minimum horizontal distance is only 1.0 meters, the construction of the high risk and environment risk, construction difficulty is big, belongs to the level design Ⅰ significant risks.

Construction risk, in order to ensure the security of the shield machine through scientific planning, city rail group focus and push for construction unit completes the shield machine through the test section of north-south viaduct pile group of former number one summary work, optimization of shield tunneling parameters in time, complete each emergency preparedness, while the third party safety risk assessment unit to shield interval through the bridge pier of a detailed analysis, forecasting and risk evaluation, settlement, bridge pier of the viaduct surface, lateral peripheral monitoring of structures built in key projects on a tight leash, successful security shield interval through the bridge pier construction safety, It has accumulated valuable experience for hefei rail transit engineering shield crossing important structures and other major safety risk sources.

Up to now, 24 stations, 1 entrance and exit section and 2 open-cut sections have completed the roof of the main structure. There are 34 shield tunneling machines in the whole line, 31 of which have been down the well, and a total of 55.94% of the total shield engineering has been completed.