The Guideline on Inner Shell Concrete, first published in 1995, was revised by the ÖVBB Working Party on „Concrete in Tunnelling“ in 2003. The main purpose of the revision was to incorporate the new European standards in the field of concrete engineering, applicable also in Austria, and to consider the most recent findings of construction practice. At the same time, the Guideline was extended to include provisions regarding the construction of intermediate ceilings and partitions for ventilation ducts.
The Working Party comprises representatives of principals, contractors, university research and testing institutes, as well as concrete manufacturers and design engineers.
This Guideline contains a practice-oriented set of rules for reinforced and nonreinforced inner shells, covering planning, design, tendering, production and testing, with a special emphasis on the requirements of modern traffic tunnel construction.
The intended incorporation of the Guideline on Inner Shell Concrete into the binding set of rules of the Austrian Road and Transport Research Society in the near future is to contribute towards its uniform application and, thus, a further improvement of the quality of inner shells.