CRCHI TBM at work in Hangzhou Genshan East Road Crossing River Tunnel“Qiantang Jixiang” 15-meter mega Slurry TBM

Project: Hangzhou Genshan East Road Crossing River Tunnel
Location: Hangzhou City, Zhejiang Province, China
Customer: China Railway 14th Bureau

Innovation of mega Slurry TBM
On June 28, the ‘Qiantang Jixiang’ 15-meter mega Slurry TBM rolled off the assembly line at CRCHI. The excavation diameter of the equipment is 15.01 m, its total length is about 130 m, total weight is about 4300 t, installed power is about 9755 kW, rated torque is 42784 Nm, and the maximum excavation speed is 50 mm/min. It will be used for the construction of crossing river tunnel of Genshan East Road in Hangzhou, China.

Project Overview
The Genshan East Road Crossing Tunnel Project in Hangzhou is designed as an urban expressway, including a cross-river tunnel, a comprehensive pipeline gallery, a ground connection line project and supporting auxiliary projects. The total length of the project is 4,725 m (including ground connection roads), and the total length of the tunnel is 4575m. About 3160 m of the tunnel will be using a TBM. The length across the Qiantang River is about 2.3 km. It has a double-tube circular structure and six lanes in two-way. The design speed in this tunnel is 80 kilometers per hour.

Engineering Challenges
The tunnel section advancing with TBM passes mainly through soft soil layers, such as silty soil, mucky soil, and cohesive soil, with a maximum buried depth of up to 44.2 m. The main difficulties in the construction process are as follows:
  • The tunnel excavation section has a diameter of 15.01 m, and the stability of the tunnel face is difficult to control. The TBM should have the ability to accurately control the stability of the tunnel face to prevent it from collapsing.
  • For advancing in soft soil, poor stratum bearing capacity and poor permeability will cause the TBM to sink, and the segments to float up. Therefore, it demands high precision and control of the TBM and high quality of segment box culvert assembly. In addition, due to the high content of viscous particles in the formation, a large capacity of the ground slurry treatment system is required. Since the problem of mud cakes often occurs for the cutterhead, the TBM should have the ability to prevent mud cakes and efficiently process them.
  • Long-distance crossing of the Qiantang River, and construction at the bottom of the river has high requirements on the reliability of the TBM and the balance of the excavation face, avoiding the breakthrough of the river bottom.
  • The length of the section is 3.2 km, which requires high reliability for TBM seals, including main drive seal and tailskin seal, and high requirement for wear resistance of the cutterhead, cutters, and slurry pipelines.
  • Since there may be harmful gases in the formation, the TBM should have reliable harmful gas detection devices and be equipped with a high-power ventilation system to discharge the gases on time.
Engineering Feat
The CRCHI R&D department has tackled all the key problems with the Qiantang Jixiang 15-meter mega Slurry TBM. The machine was designed to have soft soil cutterhead which features cutter change in free air, frequency conversion motor for the main drive and a retractable cutterhead. Cutting-edge technological advancements include main drive seal which is automatically pressurized, high precision gas-liquid pressure balance control, simultaneous lifting and assembly of segments and box culvert. Therefore, the performance reliability and geological adaptability of the shield machine have been improved dramatically. The development of this TBM has strongly promoted the development process of China’s mega Slurry TBM.
Gati Shakti is a digital backbone on which infrastructure projects planned by the government under the ₹110 trillion National Infrastructure Plan (NIP) will be implemented by 2025. It provides an institutional framework

Read more ...

Equipment with cutting edge technologies is making tunneling smoother at RVNL’s mega railway project and helping contractors overcome geological complexities. Sandvik’s DT 821 C and DT 922i advanced automatic

Read more ...

The Metro-Rail segment in India is growing at a frantic pace with positive long-term prospects, supported by the impetus provided by the government by way of business-friendly policies and financial support. Use of advanced

Read more ...

Lucknow Metro has achieved the distinction of becoming the fastest built metro rail project in the country - both in terms of completion of construction work and execution. On 25th November 2013, LMRCL

Read more ...

India received its first mode of modern transportation in 1853 when the first railway line was laid from Bombay to Thane to boost industrial activities and ensure easy accessibility to heavy raw materials. In the following

Read more ...

The growth of the tunnel construction in the country has been driven by a robust pipeline of projects and investments in setting up hydropower projects, developing urban mass rapid transit systems, improving road

Read more ...

Stoked by their debut success with the timely completion of Kajang Line’s underground section, Gamuda Engineering found themselves pitted once more against the unique challenges of tunnelling in Kuala Lumpur

Read more ...

A tunnelling project is a race against time and costs. Getting it right from the very beginning requires knowledge, skill and experience, as well as a proper range of equipment that fulfils the customer’s tunnelling

Read more ...

The Mumbai-Nagpur Expressway is delayed until 2022. In the meantime, a machine ‘GHH IS26’ with remarkable reliability has been specially flown in from the supplier and is in operation to help complete the project

Read more ...

The project, located at the riverside of the Moscow River, passes under heavy traffic and crowded buildings. It includes two sections of a total length of 2947m. One is from Maple Avenue Station to No.2 Working Shaft

Read more ...

Pull Force is the force that a truck or prime mover can exert onto a transporter or any type of trailer. It has been a subject of much controversy and misunderstandings as truck manufacturers and end-users often do not talk

Read more ...

The first Sandvik DT922i, a computer controlled fully automatic tunneling jumbo, has been introduced by Sandvik Mining and Rock Technology in India with a vision to achieve high levels of safety, productivity and

Read more ...

Horizontal Directional Drilling is a technology in pipe and utility installation that allows greater accuracy and flexibility in placement and ends the need for costly digging, large crews, road closures and other

Read more ...

Special knowledge is required for building tunnels and wind energy plants in order to implement demanding projects. The facilities and manufacturing processes required for such projects can be adjusted well in advance for

Read more ...

The Large Hadron Collider (LHC) at CERN is the biggest particle accelerator in the world – and growing. To equip the LHC for new, more ambitious experiments in the next decade, the accelerator is currently

Read more ...

The river has its source at over 3000 meters high in the snow-covered Andes. It reaches the Pacific Ocean after 250 km. On its way, it overcomes a considerable gradient and is, therefore, ideally suited to generate electricity

Read more ...

Tan Shunhui, Chairman, CREG, discusses the competitive advantages of the company’s tunneling equipment and solutions, emerging opportunities in developing countries, factors driving its growth and success across

Read more ...

Being the longest water delivery line in the history of Jilin province, transferring water from Songhua River into Central Jilin Province will transfer the largest capacity of water and cover the largest areas. The water diversion

Read more ...

Amit Kaul, BASF India Limited (Construction Chemicals Division), India, tells about the innovative tunnel lining system and related design aspects, and also describes the main advantages of this lining system in comparison

Read more ...

×
Sign-up for Free Subscription
'India Construction Week'
Weekly e-Newsletter on Construction Industry
Get the latest news, product launches, projects announced / awarded, government policies, investments, and expert views.