Recently，Jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau，Application of the Largest Diameter Shield Machine in Hunan Province“Xingsheng”The cutter head broke through the wall.，It marks the smooth completion of the right line tunnel of the Xiangya Road crossing the Yangtze River in Changsha.，It also marks the realization of double-tunnel penetration of the largest diameter shield tunnel under construction in Hunan Province.。

“Xingsheng”Helping the Right Line Tunnel of Xiangya Road River-crossing Passage in Changsha to Run Through Smoothly

It is the largest river-crossing tunnel in Hunan Province so far.，Xiangya Road River-crossing Channel is a key infrastructure project in Hunan Province.，It is also a major livelihood project benefiting millions of households in Changsha.。The total length of the tunnel is 4180 meters.，Among them, 1429 meters are constructed by shield method across the Xiangjiang River.，It is the first two-way six-lane river-crossing tunnel in Changsha.。The project mainly passes through moderately weathered rocks.、Slightly weathered slate，Maximum strength 86.6 MPa，There are many fracture zones in the interval.，Maximum burial depth 46.3 meters。At the same time，Xiangya Road River-crossing Tunnel and Changsha Metro Line 6 are constructed in parallel at the same time.，Difficult in construction organization，High construction risk。

“Xingsheng”Departure site

In view of these geological problems，Tailor-made excavation diameter of CRCHI 15.01 meters“Xingsheng”，Cutter head and cutter adopt targeted design，Effectively deal with the rock formation at the bottom of the river.、Impact on Cutter Head of Shield Machine during Excavation in Composite Stratum，Significantly reduce tool change frequency，And that excavation efficiency is improve，Finally, the smooth penetration is realized.。

And not so long ago,，Good news also came from Zhuhai Hengqinzhou Tunnel, which is more than 800 kilometers away from Changsha.。The 15-meter super-large diameter shield machine jointly built by China Railway Construction Heavy Industry and China Railway 15th Bureau“Zhenxing”The huge shield came out slowly.，It marks the successful completion of the left tunnel of Hengqinzhou Tunnel in Zhuhai.，To lay a solid foundation for the successful opening of traffic in 2024。

“Zhenxing”Help the left tunnel of Zhuhai Hengqinzhou Tunnel run through smoothly

Hengqinzhou Tunnel is located in Hengqin Guangdong-Macao Deep Cooperation Zone.，The tunnel underpasses the Ma Wai Chau Waterway，It connects Hengqin Island in the south，To the north is Zhuhai，The whole tunnel passes through the ultra-soft soil stratum.，Proportion of ultrafine particles below 20 microns 74.7%Above，Maximum buried depth 50m，It is the softest stratum in China at present.、Super large diameter shield subsea tunnel with the highest content of fine particles。

“Zhenxing”Seven months of underground excavation.，A journey across the sea，And finally come out of the hole.，Security is achieved、Fast、Efficient construction。

Forming site of Zhuhai Hengqinzhou Tunnel

This time“Xingsheng”“Zhenxing”Double power-assisted tunnel penetration，It once again demonstrates the hard core strength of Railway Construction Heavy Industry in shield construction.。In recent years，Railway Construction Heavy Industry has broken through a number of key core technologies.，Constantly refreshing the shield construction record，Use“A great power weighs heavily”Serve the high-quality construction of the city。