The embedded prestressing ring – an innovative reinforcement concept as an alternative to support arches or lattice arches in tunnel construction
The embedded prestressing ring – an innovative reinforcement concept as an alternative to support arches or lattice arches in tunnel construction
About us
In 2017, a concept for the prestressing arch system for conventional bored tunnels was created by the partners of GSR Spannring GmbH and a patent was applied for even before the first installation attempt.
The idea arose out of years of experience in reinforcement designs and their implementation in tunnel construction. The prestressing arch or prestressing ring system was intended to replace the elaborate work with support arches or lattice girders. The system would offer the steel fixer a precisely positioned installation level. Each ring was to be measured by means of a tunnel measuring system. In this way, subsequent costs for renovation of the inner shell due to non-compliance with the concrete cover were to be reduced to a minimum. That was the theory.
The first practical field test proved to be a complete success. In late 2018, an order was promptly received from the “STRABAG Consortium/Salini Impregilo” for the contract section H33 Tulfes/Pfons of the Brenner basis tunnel.
GSR Spannring GmbH’s goal is to optimise the construction process with the flexibility of the prestressing arch system and to increase the dimensional accuracy of the finished reinforcement to the extent that renovation measures due to concrete cover problems are eliminated.
Full round prestressing ring
Contact
+49 6701 – 933 150
zentrale@spannring-gmbh.eu
Office
GSR Spannring GmbH
Zotzenheimerstrasse 64a
D-55576 Sprendlingen
Germany
NOTE
Our processes and products are comprehensively protected by brand and design registrations, national patent and utility model registrations as well as international patent applications. Neither the illustration of our products on this website and in catalogues, nor process demonstrations and the sending of samples and ordered goods include consent for the copying of our processes and products. In order to maintain protection, we defend our property rights against copying and violation. We are grateful for all notifications if such behaviour is discovered.
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