November fifth，Jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau “Hero”The shield machine started smoothly in Tianxiang Avenue Tunnel of Changjiu High-speed Railway。“Hero”Excavation diameter up to 14.8 meters，It is the largest diameter shield machine successfully launched by China Railway at present.。

Changjiu High-speed Railway is located in the north of Jiangxi Province.，The line starts from Chaisang District of Jiujiang City in the north.，South to Nanchang County，Total length 137.Seven kilometers，The design speed is 350 kilometers per hour，It's the country《Medium and long term railway network planning》“Eight vertical and eight horizontal”It is an important part of the Beijing-Hong Kong corridor in the main high-speed railway corridor.，It is also the key section to build a high-speed railway corridor with a speed of 350 kilometers per hour from north to south in Jiangxi Province.。

Tianxiang Avenue Tunnel is one of the control projects of Changjiu High-speed Railway.，The construction standard is high、The construction is difficult。The total length of the tunnel is about 6.Four kilometers，It is one of the control projects of Changjiu High-speed Railway.，It is a single-hole double-track tunnel.，Wherein the length of the shield section is 4.Four kilometers。At the same time，Innovative adoption of internal structure of tunnel“Integral precast box culvert”，It is implemented for the first time in the 350 km/H high-speed railway tunnel in China.，Long distance crossing of complex water-rich strata and 78 risk sources。

For the large excavation section of the project、The tunnel section is long、There are many geological risks.，“Hero”A number of innovative technologies have been adopted，It provides a key equipment guarantee for tunnel shield tunneling.，To contribute to the high-quality construction of Changjiu High-speed Railway。

It is reported that，After the completion and opening of Changjiu High-speed Railway，For Jiangxi Province to build an integrated transportation system in Changjiu、Further docking and integration into Guangdong-Hong Kong-Macao Greater Bay Area，Implementing the development strategy of the Yangtze River Economic Zone，It is of great significance to promote high-quality economic and social development along the line.。