July 5，The largest diameter shield tunnel in Hunan province——Changsha Xiangya Road River-crossing Tunnel Opened to Traffic，It will effectively alleviate the traffic pressure of Yinpenling Bridge and Yingpan Road Tunnel.，Realize networking、The goal of internal and external smoothness。The tunnel is a super-large diameter slurry balance shield machine jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau.“Xingsheng”Tunneling through。

“Xingsheng”Shield Machine Helps Changsha Xiangya Road River-crossing Tunnel Open to Traffic

Xiangya Road River-crossing Passage Project starts from Yuehua Road in Yuelu District in the west，East to Furong Road, Kaifu District，The total length of the tunnel is 4180 meters.，The river-crossing section is constructed by shield method.，Single line length approx. 1.Four kilometers，The shield tunnel has passed through the Xiangjiang River embankment for four times.、Two river bottom fracture zones with a total length of more than 450 meters were crossed twice.，The geological conditions are complex。

Changsha Xiangya Road River-crossing Tunnel

“Xingsheng”The maximum excavation diameter of shield machine is up to 15.0 1 m，The whole machine is about 129 meters long.。Railway Construction Heavy Industry Co., Ltd. combines the engineering characteristics of the project、Key and difficult points and rich construction and technical experience in the past，Adopt heavy-duty composite cutter head+High-wear-resistant long-life cutting tool、7.Design of 6m Heavy-duty Main Bearing，Effectively solve the problem of rock strata at the bottom of the river.、Impact on Cutter Head of Shield Machine in Complex Stratum，Reduce tool change frequency，And that excavation efficiency is improve，Ensure smooth construction of the tunnel。

“Xingsheng”Ultra-large diameter slurry balance shield machine

Xiangya Road River-crossing Tunnel is a key infrastructure project in Hunan Province.，It is positioned as a city-level trunk road.，It's downtown Changsha“Eighteen horizontal and sixteen vertical”One of the thirty-four main roads。The completion and opening of the tunnel will help Changsha speed up the construction of a national comprehensive transportation hub.，Construct the two sides of the river to fly side by side、Hedong and Hexi linkage and coordination“Big traffic”New pattern of urban development，Solve the traffic across the river in the central city of Changsha“Bottleneck”Question。