Horizontal Raise Boring

Horizontal Raise Boring’s (HRB) continuous excavating cycle produces a stronger structure than conventional drilling and blasting, and is more cost effective and reliable than other systems.
Horizontal Raise Boring 1

Horizontal Raise Boring

We have pioneered HRB technology and applications worldwide. HRB is similar to traditional raise boring where a contact tunnel is bored horizontally.


Used where a horizontal excavation is required and a chamber is available at both ends.

Excavating tunnels through mountains to connect parallel metro and rail tunnels.

For nuclear storage tunnels or short tail races in hydro-electric plants.


Has lower support requirements due to stable circular excavation.

Improved production advance rates as a result of continuous excavating cycle.

Compact equipment design contributes to greater mobility. More cost effective
and reliable when compared to a TBM system.