During the Spring Festival, three 15m-class TBMs from CRCHI (the 15.01m 'Xingsheng', the 15.01m 'Qiantang Jixiang', and the 15.07m 'Qiantang Fenjin No.1') successively helped complete the Xiangya Road river-crossing tunnel, the Hangzhou Genshan East Road river-crossing tunnel, and the Hangzhou Xiasha Road tunnel. The three machines celebrate the New Year together!

The largest diameter TBM applied in Hunan Province'Xingsheng' helps complete the river-crossing tunnel

(15.01m)

Recently, the 'Xingsheng' TBM, jointly built by CRCHI and China Railway 14th Bureau Group and the largest diameter TBM applied in Hunan Province, broke through the wall, marking the successful completion of the north line of the Changsha Xiangya Road river-crossing tunnel. This is currently the largest diameter TBM tunnel under construction in Hunan Province.

As the river-crossing tunnel with the largest cross-section to date, the Xiangya Road river-crossing passage is a key infrastructure project in Hunan Province and a major livelihood project benefiting thousands of households in Changsha. The project starts at the intersection of Tongzipo Road and Yuehua Road in Yuelu District in the west and ends at the intersection of Xiangya Road and Furong Middle Road in the east. It is positioned as a municipal arterial road and is one of the 34 main roads in Changsha's '18 horizontal and 16 vertical' road network.

The shield-driven section is about 1,429 meters long, mainly crossing moderately weathered rock and slightly weathered slate with a maximum strength of 86.6 MPa. There are multiple fault fracture zones in the interval, with a maximum burial depth of 46.3 meters. The tunnel passes under the Xiang River, and the river-crossing section is designed with dual six-lane carriageways, a first for river-crossing tunnel projects in Hunan Province. At the same time, the Xiangya Road river-crossing tunnel is constructed in parallel with Changsha Metro Line 6, making construction organization difficult and risks high.

To address these geological challenges, the 15.01m excavation diameter 'Xingsheng' adopts a targeted design for its cutterhead and tools, which can effectively cope with the impact on the TBM cutterhead when tunneling through riverbed rock and composite strata, reduce the frequency of tool changes, and improve excavation efficiency.

Tunneling through the Qiantang River, braving the tide'Qiantang Jixiang' helps complete the tunnel

(15.01m)

Recently, the super-large diameter slurry shield TBM 'Qiantang Jixiang' successfully completed the Hangzhou Genshan East Road river-crossing tunnel, and the Qiantang Expressway project has entered a new stage.

The Genshan East Road river-crossing tunnel project is designed as an urban expressway, including the river-crossing tunnel, utility tunnel, ground connection works, and supporting ancillary works. The tunnel opens a new route between Dajiangdong and the main urban area of Hangzhou, providing strong support for the construction and development of Dajiangdong. It can alleviate traffic pressure on the Jiangdong Bridge and shorten the travel time from Dajiangdong to the main urban area of Hangzhou and surrounding cities.

The project is 4,725 meters long (including ground connection roads), with a tunnel length of 4,575 meters. The shield tunnel section is about 3.2 kilometers long, crossing the Qiantang River for about 2.3 kilometers. It adopts a double-tube circular structure with dual six-lane carriageways and a design speed of 80 km/h. The inner diameter of the shield tunnel segment is 13.3 meters, and the outer diameter is 14.5 meters. The project mainly crosses soft soil strata such as silty sand, mucky soil, and cohesive soil, with a maximum burial depth of 44.2 meters.

The 'Qiantang Jixiang' TBM has an excavation diameter of 15.01 meters and a total weight of about 4,300 tons. In response to the construction challenges brought by the long distance and large burial depth of the project, targeted designs have been adopted, greatly improving the reliability and geological adaptability of the TBM.

'Qiantang Fenjin No.1' helps complete the tunnel

(15.07m)

In addition to the Genshan East Road river-crossing tunnel, good news also comes from Xiasha Road, another important part of the Qiantang Expressway. The super-large diameter slurry shield TBM 'Qiantang Fenjin No.1' successfully completed the Hangzhou Xiasha Road tunnel.

As with Genshan East Road, both are supporting projects for the 2022 Asian Games. The Xiasha Road and No.12 Road upgrading and reconstruction project and ancillary supporting works include road upgrading and supporting project construction. The road upgrading mainly involves the tunnel construction of Xiasha Road and No.12 Road, and the supporting works mainly involve utility tunnel construction. The main line of the project adopts a combination of underground tunnels and local ground expressways, with dual six-lane carriageways and a design speed of 80 km/h.

The project is located in the Hangzhou Economic and Technological Development Zone, starting from the west side of Baohua Road in the west, connecting with the Genshan East Road elevated road and utility tunnel, and ending at the east side of No.23 Road in the east, with a total length of 7.47 kilometers. The shield tunnel section is 1,605 meters long, mainly crossing silty sand and mucky silty clay layers, with a minimum turning radius of 600 meters.

The 'Qiantang Fenjin No.1' has an overall length of about 130 meters, a total weight of about 4,300 tons, an excavation diameter of 15.07 meters, and a maximum advance speed of 50 mm per minute. The TBM has advanced technical indicators and powerful functions, and adopts targeted design to enable efficient tunneling under different geological conditions.

The successive breakthroughs of three large-diameter TBMs during the Spring Festival demonstrate CRCHI's excellent product quality and strong technical strength. It is the best Spring Festival gift from CRCHI people. In the future, CRCHI will maintain its momentum, advance steadily, and continue to contribute to national construction.