ÖNORM B 2203-2

This ÖNORM contains Rules of Procedure and Terms of Contract for the implementation of underground works using continuous (TBM) tunnelling. This ÖNORM also applies to walkable tunnels driven by pipe jacking if tunnelling requires the presence of employees in the tunnel. This ÖNORM does not apply to microtunnels nor to tunnels constructed by open-cut methods. Section 5 contains the terms of contract for the execution of underground works using continuous driving (TBM tunnelling). Together with ÖNORM B 2110 or ÖNORM B 2118, these terms of contract regulate the rights and obligations of Owners and Contractors. Within the meaning of Standards ÖNORM A 2050 respective the federal law of public procurement, the terms of this ÖNORM shall be included in the Tender Documents and in the Bids. Standard ÖNORM B 2203 consists of the Part 1: Cyclic driving (conventional tunnelling) and Part 2: Continuous driving (TBM tunnelling).