The physical progress of works on the Boita 1 tunnel on the Sibiu - Pitesti Motorway (A1) has reached approximately 30%, the general director of the National Road Infrastructure Management Corporation (CNAIR) Cristian Pistol announced on Monday.

'Update on the Sibiu - Pitesti Motorway (A1), Section 2: the first gallery of the Boita 1 tunnel was broken through today. The tunnel consists of two galleries, measuring 264 metres and 247 metres, respectively, and today the Turkish builders (the Mapa - Cengiz association) completed the breakthrough on the Sibiu - Pitesti carriageway. In the right-hand gallery (Pitesti - Sibiu direction), 152 metres are still to to be excavated. The physical progress of works on this tunnel has reached approximately 30%,' Pistol wrote on Facebook.

According to the CNAIR head, work is being carried out simultaneously on two other tunnels: Balota (500 m) - where exterior linings are being executed at the exit portal and excavation progress stands at 4%; Robesti (900 m) - both galleries have been broken through, and overall physical progress is approximately 36%.

'At present, reinforcement, formwork and concreting works are underway on the bench foundation at the entrance portal. Across Section 2 (Boita - Cornetu), 630 workers and 150 pieces of equipment are mobilised, and overall physical progress is around 13%. Without the revised environmental permit - and therefore without construction permits for the entire site - the builders can carry out only about 45% of the total works provided in the contract. For this reason, activities are concentrated on tunnels, viaducts, earthworks and consolidation works on the segments for which construction permits have been issued,' Pistol said.

Section 2, spanning 31.33 km, will include seven tunnels, all built using NATM (New Austrian Tunnelling Method) - a technology that relies on the natural strength of the rock mass to support the tunnel through shotcreting, bolting and stabilisation.

The contract, worth RON 4.25 billion (VAT excluded), is financed through the Transport Programme . AGERPRES (RO - writing by: Oana Tilica; EN - writing by: Simona Klodnischi)

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