Guiyang rail transit line 3 tunnel successfully under the city xihe

On November 23, the left line of the tunnel between Songhua Road station and Huansha Road Station of Guiyang Rail transit Line 3 successfully crossed the Xihe river in Guiyang city. This was another successful crossing of major risk sources after the right line crossed the Xihe River in Guiyang city on August 27, indicating that the construction of songhua Road tunnel has conquered another risk point.

The left line tunnel is located under Huansha Bridge and needs to cross the Shixi River, which is about 18 meters wide and 1.5 meters deep. The minimum vertical net distance between the tunnel roof and the riverbed is only 9.93 meters. The geological conditions of the section crossing the river are very complex, and the karst is extremely well developed, mainly consisting of karst caves, dissolved trenches (troughs) and fissures, and most of them are connected with shixi River, which is easy to cause the risk of pervious gushing.

To ensure the smooth wear condition, under the double safety project department insist on advancing deployment, process inspection, organize many expert argumentation, and optimize the construction plan, strengthen key hidden perils in safety risk management, strict execution implementation in construction and to strengthen the safety technical disclosure and advance geological forecast, the whole section of the curtain grouting of pipe roof reinforcement construction measures, Strict process inspection and construction acceptance, the implementation of mandatory standards and card control red line. After the completion of each circular curtain grouting, the five parties participating in the construction shall carry out the next step of construction after passing the acceptance inspection. We will work hard on the investigation and treatment of potential safety hazards, and resolutely resolve all kinds of potential safety hazards at the source and eliminate them in the bud.