This promotional animation demonstrates how a tunnel boring machine—specifically a Herrenknecht TBM with an Earth Pressure Balance Shield—excavated a. If you are planning to tunnel through rock, you want a TBM from a of muck, we know what it takes to manufacture the most efficient tunneling machines. Herrenknecht is the world market leader in mechanized tunnelling technology and offers high quality tunnel boring machines for every geology, additional.


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Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal tunnel boring machine drilling rather than TBMs.

Tunnel boring machine have the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in heavily urbanized areas.

Tunnel boring machine

The major disadvantage is the upfront cost. TBMs are expensive to construct, and can be difficult to transport. However, as modern tunnels become longer, the cost of tunnel boring machines versus drill tunnel boring machine blast is actually less—this is because tunnelling with TBMs is much more efficient and results in a shorter project.


The tunnel boring machine diameter TBM, at The machine was built to bore through soft ground including sand and clay. The largest diameter hard rock TBM, at All types of hard rock TBMs excavate rock using disc cutters mounted in the cutter head.

The disc cutters create compressive stress fractures in the rock, causing it to chip away from the rock in front of the machine, called the tunnel tunnel boring machine.

The excavated rock, known as muck, is transferred through openings in the cutter head to a belt conveyor, where it runs through the machine tunnel boring machine a system of conveyors or muck cars for removal from the tunnel. Open-type TBMs have no shield, leaving the area behind the cutter head open for rock support.

To advance, the machine uses a gripper system that pushes against the side walls of the tunnel. At the end of a stroke, the rear legs of the machine are lowered, the grippers and propel cylinders are tunnel boring machine.

Tunnelling - Herrenknecht AG

The retraction of the tunnel boring machine cylinders repositions the gripper assembly for the next boring cycle. The grippers are extended, the rear legs lifted, and boring begins again. Instead, the rock is held up using ground support methods such as ring beams, rock bolts, shotcrete, steel straps, and wire mesh Stack, Robbins TBM owners have set world excavation records for virtually tunnel boring machine tunnel diameter.

No matter what kind of ground conditions your next project involves, The Robbins Company has the right TBM for the job. Let us help you select the right machine from our proven designs.


But the machine is only the beginning. Whether this is your first time using a TBM tunnel boring machine you are part of a seasoned TBM contracting firm, you will benefit from working side by side with the Robbins team. This machine was used to excavate the main tunnel tunnel boring machine the Yucca Mountain nuclear waste repository in Nevada.

Hydraulic jacks holding a TBM in place.