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Shaft Boring Cutterhead (SBC)

Safe and fast full-bottom shaft sinking to depths of 1,000 meters

Geology Rock
硬岩
Diameter
8-9米

The Shaft Boring Cutterhead (SBC) was developed for mechanized full-bottom shaft sinking in hard rock to a depth of 1,000 meters. The cutterhead is conical in shape and equipped with disc cutters. The excavation sequence is highly automated.

The excavation chamber is filled during the advance and can thus also be used as a shaft sump for water ingress from the geology. The conical cutterhead has a speed of 2 to 3.5 revolutions per minute and thus achieves an advance rate of about 1 centimeter per minute depending on the geology.

By means of liquid mucking, a pump system transports the drill cuttings from the excavation chamber through the machine to a separation plant. Here fine and coarse material is separated from the suspension. Coarse material is transferred to the shaft conveyor by buckets, while fine material is pumped to the surface with a separate slurry circuit, which is also available for shaft drainage.

After an advance of 1 meter has been sunk, the SBC attached to the shaft ropes is lowered.

The possibility of installing shaft lining from a work deck of the SBC is adapted to the requirements of the project.

Proven technology as the basis for new developments

The components used in the SBC have proven themselves worldwide in Herrenknecht shaft sinking and tunnel boring machines.

Although on the SBC work steps are carried out in parallel, the machine concept has significantly increased work safety compared to conventional shaft sinking. During excavation, the personnel are not exposed to the unlined shaft wall. Also, contact with silicate or other dust is reduced to a minimum.

Functional principle

1
Muck bucket

The muck is hoisted to surface. Auxiliary and man buckets are also used

2
Slurry mucking system

Use of submersible pumps to lift the cuttings to a de-sander. Bigger chips are hoisted to surface

3
Sheaves deck

SBC is suspended by shaft ropes and can be lifted or lowered as required

4
Gripper

Creating additional thrust force for the cutterhead and steer the cutterhead according to the guidance system

5
Excavation chamber

When using the slurry mucking method the bench is flooded and can be used as a sump for water ingress

6
Work decks

The dewatering units, slurry and feed lines are located and extended from the decks, same as installation, infrastructure and supply line extensions for power, air and ventilation

7
Control cabin

The SBC operator controls all functions and the semiautomatic excavation process

8
Rock support deck

Several applications can be installed: shotcrete, rock bolts, mesh, segments or liner plates

9
Cutterhead

Equipped with cutting discs and can be adapted to different diameters

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The muck is hoisted to surface. Auxiliary and man buckets are also used

Use of submersible pumps to lift the cuttings to a de-sander. Bigger chips are hoisted to surface

SBC is suspended by shaft ropes and can be lifted or lowered as required

Creating additional thrust force for the cutterhead and steer the cutterhead according to the guidance system

When using the slurry mucking method the bench is flooded and can be used as a sump for water ingress

The dewatering units, slurry and feed lines are located and extended from the decks, same as installation, infrastructure and supply line extensions for power, air and ventilation

The SBC operator controls all functions and the semiautomatic excavation process

Several applications can be installed: shotcrete, rock bolts, mesh, segments or liner plates

Equipped with cutting discs and can be adapted to different diameters

With the further development of existing technologies and profound engineering know-how, Herrenknecht opens up new business areas. In the field of mining in particular, innovative machine concepts are needed to safely and efficiently develop deposits even at great depths.

Still got questions?

We are ready!

Jack Brockway President and CEO Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser COO Herrenknecht Tunnelling Systems USA, Inc.

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Jack Brockway President and CEO Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser COO Herrenknecht Tunnelling Systems USA, Inc.