Replacement of the Mainzer Straße Bridge

Summary

The contract covers replacement of the Mainzer Straße bridge in Koblenz, including foundations for temporary bridges; demolition and reconstruction of adjacent retaining walls and parapets; alterations to nearby road sections and ramps; sewer renewal; and the civil works needed to remove the existing DN 400 steel gas pipe and install a replacement. Installation and assembly of the gas pipe will be carried out by the utility network operator’s contractors. The civil-works contractor must coordinate their work, provide and secure trenches, account for backfilling, and carry out the associated civil engineering works. The new pipe must have at least 0.90 m of cover. The scope also includes road and sewer works and proper separate handling of construction and demolition waste. Bids must be submitted electronically in German by 26 November 2026 at 09:30 and remain valid for 66 days. Price is the sole award criterion. Work must begin no later than 12 working days after receipt of the contract letter and be ready for acceptance by calendar week 7 of 2030. Interim milestones are completion of the temporary abutments in calendar week 30 of 2027 and opening four-lane traffic on the completed bridge deck in calendar week 11 of 2029. Tenderers must provide evidence of suitability and three previous references, or an appropriate prequalification registration, workforce figures and tax, social-security and registration certificates. The bid must also include, among other items, the declaration on collective-agreement compliance and minimum pay, a priced bill of quantities, and a construction schedule and work-sequence plan.