CRCHI Urja Becomes First TBM to Complete Tunnelling in Phase-2 of Bangalore MetroTBM assembly at site
On 22nd September 2021, hard rock/slurry TBM Urja (DZ670) manufactured by China Railway Construction Heavy Industry Cooperation Limited (CRCHI) achieved a breakthrough from the Cantonment Station to the Shivaj Nagar Station among the 9 TBMs in Phase-2 of Metro project in Bangalore, India.

It is acknowledged that the Bangalore metro project with frequent stratum variations is one of the most challenging metro construction projects which uses the TBM method. The total length of the section is 855 meters, among which, 250 meters surrounding rock strength is up to 200 MPa of full section hard rock, 350 meters compound stratum with a large number of boulders, hard bottom and soft top, and 255 meters consisted of sand or backfill stratum.

Apart from this, the TBM passed through the shallow buried depth section of the old town of Bangalore city with dense residential areas. The minimum buried depth is 7.6 meters, and the geological conditions are very complicated. In order to overcome the variable geology and shallow buried depth, CRCHI carried out a number of specific designs for this hard rock/slurry TBM to ensure smooth tunnelling under complicated geological conditions. The TBM is equipped with heavy composite cutterhead, active hinge + stabilizer, advanced geological detection and grouting system, excavation management system, and other features.

CRCHI supplied 4 sets of TBM for this project, and the Urja TBM will be transported to the launching shaft at the north end of Cantonment Station, where it will continue to construct a tunnel between the Cantonment and Pottery Town stations in the city.
CRCHI Slurry TBM ‘Avni’ Helps Make a Breakthrough in Bangalore Metro Project
The 6.6m Slurry TBM developed by CRCHI exited the tunnel at Vellara Station, Phase II of Bangalore Metro in India, becoming the first TBM to complete the breakthrough for the whole line of the project. Avni is one of the four slurry TBMs provided by CRCHI

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The Bolter Miner - A Technology Revolution for Roadway Development in Underground Coal Mining
In India, coal is still the primary source of energy; over the past few years, there has been quantum jump in coal production level, but it was mostly due to the high percentage share from the opencast sector. The country is witnessing a fast

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CRCHI emerges as provider of total underground engineering equipment and solutions
China Railway Construction Heavy Industry Corporation Limited (CRCHI) showcased its comprehensive range of equipment and products at bauma that included solutions for the whole industry chain in the field of

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Herrenknecht AG wins bauma Innovation Award 2022 for development of continuous tunnelling
Herrenknecht AG won the highly coveted award bauma Innovation Award 2022 in the category “Machine Technology” for the new development of continuous tunnelling. The award was given for the next innovation boost in the mechanized

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The Genesis of Underground Engineering
Regardless of the tunnelling technology used, tunnel designers decide the future success or failure at an early project stage. In fact, designers are the real managers of tunnel construction. The choice of design together with selected contract model is

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Managing Geological Complexity in BVC and PAC of Tehri PSP, India - A case study
Tehri hydroelectric project is located on the left bank of River Bhagirathi in the state of Uttarakhand. Tehri Pumped Storage Project (PSP) comprising 4 Nos of reversible pump-turbine units of 250 MW each, involves construction of an underground Machine Hall

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TBM driving under low overburden by adopting innovative methodology
TBM mining in urban areas particularly under low overburden (less than 0.5D, D = tunnel Dia) is a big challenge to design team as well as execution team. While working in a Lucknow metro project, the metro authorities encountered a stretch where TBM had to cross

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Tunnel Ventilation System Basic Concepts and Designing Principles
The term ventilation combines several functions such as smoke extraction, pollution ventilation, and ventilation for environmental purpose. The design of a ventilation system is usually based on three scenarios: During construction: to provide external

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CRCHI Mega Slurry TBM ‘Jinghua’ Assists the First Tunnel Section Breakthrough of Beijing East Sixth Ring Road Reconstruction Project
In September 2022, the Beijing East Sixth Ring Road Reconstruction Project reported another good news: the CRCHI mega slurry TBM ‘Jinghua’ smoothly reached the intermediate air shaft, marking the project’s achievement. The maximum excavation diameter

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TERRATEC EPBMs ready to tackle Kanpur Metro’s 1st Underground Section in India
TERRATEC celebrated the successful site acceptance testing of two 6.52m diameter Earth Pressure Balance Tunnel Boring Machines (EPBMs) for Uttar Pradesh Metro Rail Corporation (UPMRC) for Corridor-1 of Kanpur MRTS Project (KNPCC-05) in India. The two 6.52m

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Tunnelling Asia 2022 - International Conference on Underground Space
Tunnelling Asia 2022, organized by TAI, which took place in Mumbai during 27th and 28th June, saw a huge gathering of delegates/engineers from all around the world. The theme of the conference: ‘Underground Space: Need of the Day’ focused on

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Hydraulic Heave Failure Mitigation Approach for the construction of the Deepest Metro Ventilation and Egress Shaft in India
Dr. Lakshmana Rao Mantri, Assistant General Manager (Designs), and Satya Narayan Kunwar, Project Manager, AFCONS Infrastructure Ltd. , discuss the design and construction challenges of constructing India’s deepest underground metro ventilation

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Creating Zero-Carbon Tunnels
Despite a daunting timeline set by the Paris Accord, zero-carbon tunnels are within reach, provided the right solutions are implemented. Er. Vasileios (Bill) Paoulos, CMT, CMRL, L&T Construction Heavy Civil Infrastructure

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Readily Biodegradable Soil Conditioning Foaming Agents - A New Technology
Mike A. Sposetti, Global Technical Manager TBM, Underground Construction, Master Builders Solution, Malta, and Manish Gautam, Product Segment Manager - UGC TBM Tunneling Projects, Master Builders Solution, Mumbai, discuss how readily biodegradable

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Geotechnical challenges in Tunneling in Himalayas
G.B.Nagendra. General Manager - Projects, Konkan Railway Corporation, gives a first-hand experience of the adverse geological conditions encountered during construction of Tunnel T5 of the Katra-Dharam Section of the USBRL Project and the solutions

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Cut & Cover Metro Stations & Other Underground Structures
Vinay Gupta, Director & CEO, Tandon Consultants, discusses the intricacies and issues in the construction of underground metro stations including strata survey during structural design, selection of methods and techniques of construction, traffic management

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Importance of Pre-Injections Before Tunnel Front Advancement
Pre-injections or injections ahead of the excavation face in underground construction can, in many situations, offer significant advantages. This is particularly the case in difficult ground conditions like severe water ingress or mechanically

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The Next-Gen Sandvik Tunnelling Jumbo Drills offer best-in-class operator comfort and safety
Sandvik's fully automatic, DT 922i and semi-automatic, DT 821C jumbo drills are enabling Max Infra to attain lower drilling costs per meter, with higher machine availability during the ongoing construction of the access tunnel

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Tunnelling & Underground Projects Sharing Risks & Responsibilities
Rakesh Kumar Khali, Project Director-Hydro, Hindustan Construction Company Limited, Mumbai, describes the type of risks involved in underground construction projects, gives important guidelines to the tendering authorities and contractors

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Recovery & Recycling of Excavated Tunnel Waste
Rock excavated in an average tunneling project is often considered waste and mostly finds its way to a landfill. Depending on the geology and excavation method used, the extracted material can have significant quality deviations

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