tunneling Steel Arch

B.Zero Tondo™ Steel Arch

Our patented B.Zero Tondo™ Tunnel Support System is a new solution in tunnelling and provides extremely efficient first stage support. It has been developed to respond to the market demands for a cost-efficient and safe alternative to traditional tunnel steel arches.

B.Zero Tondo™ are unique tubular steel-arch ribs, filled with pumped concrete in-situ and offer greater structural efficiency than traditional steel-arch supports.

B.Zero Tondo™ offers a greatly enhanced response to deformations within the tunnel excavation, especially non-homogenous load conditions. Due to the optimal performance of tubular elements B.Zero Tondo™ exhibits lower stress values, compared to traditional “I” section steel arches.

Accordingly, fewer B.Zero Tondo™ arches are needed per km of tunnel than traditional arches, saving time, cost and steel usage.
A final benefit is that the circular profile reduces shotcrete rebound and shadowing, reducing use and waste.

Important note: The Bekaert-Maccaferri joint venture: In October 2014, we entered into a global sales and distribution JV with Bekaert. The resulting joint venture, BekaertMaccaferri Underground Solutions will serve underground construction markets on a worldwide basis, except in mainland China and Hong Kong, Argentina, Brazil, Paraguay, Peru, and Uruguay, where Bekaert and Maccaferri will continue to operate independently.

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