White Papers
Rebuilding TBMs: Are Used TBMs as Good as New?
Much has been made worldwide of the difference in performance between new and rebuilt TBMs. Worldwide, a bias exists that seems to favor new machines, but is the bias warranted? The reuse of machines can, if done to exacting standards, reduce costs and time to delivery while also reducing the carbon footprint. But guaranteeing the quality of TBM rebuilds is another issue—one that seems only minimally improved by the existence of international guidelines. This paper discusses the process of machine rebuilds and the use of rebuilt TBMs with performance examples from projects worldwide. It seeks to establish guidelines and recommendations based on real experiences of success in the shop and in the field.
- A Clean Solution for Renewable Energy: Small Diameter Hydro Tunnels
- Non-Circular Tunnel Boring for Underground Mine Development
- Unprecedented In-Tunnel Diameter Conversion of the Largest Hard Rock TBM in the U.S.
- Hard Rock Tunnel Boring at the Jefferson Barracks Tunnel
- The Next Generation of Mixed Ground Tunnel Boring Machines