SONEC CONSTRUCTII S.R.L. is the Romanian branch of Sümerkan Construction, an established construction company founded in 1993.
With a track record of more than 200 projects across Türkiye, Azerbaijan, Saudi Arabia and Romania, Sümerkan Construction brings extensive international experience in infrastructure and civil engineering.
Building on this heritage, SONEC provides comprehensive construction and engineering solutions, specializing in bridges, viaducts, tunnels, earthworks, reinforced concrete works, steel structures, engineering and supervision, and design and cost optimisation.
Comprehensive Construction & Engineering Solutions
From complex infrastructure projects to specialized structural works, SONEC delivers construction and engineering solutions backed by over 30 years of industry experience.
SONEC provides balanced cantilever bridge construction and viaduct construction services in Romania, including the Cluj region.
SONEC realizează lucrări de construcție a podurilor prin metoda consolelor echilibrate (în consolă succesivă) și construcții de viaducte în România, inclusiv în zona Cluj.
Specialized bridge and viaduct construction, including:
Tunnel construction and associated underground infrastructure works.
Excavation, embankments, site preparation and groundworks.
Reinforced concrete structures for infrastructure and industrial projects.
Fabrication, assembly and erection of structural steel systems.
Technical engineering, construction supervision and project coordination.
Structural and infrastructure design solutions focused on technical efficiency, buildability and cost optimisation.
Length 1,372 m · Height 166 m · Nurol Construction
Yusufeli Dam Relocation Roads Project · Length: 530 m · Height: 166 m · Main contractor: Nurol İnşaat.
Six authentic project photographs supplied by the project team, showing completed and construction-stage views. Project participation and contractual scope should be verified before publication.
Project descriptions and dimensions supplied by the client. Photographs supplied by the client; contractor names indicate project attribution and do not establish SONEC as the main contractor.
Location: Hasankeyf, Batman, Türkiye · Main contractors: Nurol – Cengiz (as provided)
Viaduct and bridge construction works in the Hasankeyf area. Photographs show the completed roadway and adjacent bridge construction.
Location: Türkiye · Main contractor: Makyol (as provided)
Construction photographs documenting reinforced concrete bridge piers, deck works, concrete placement and bridge construction equipment along the Mudurnu–Dokurcun road.
Location: Türkiye · Railway corridor: Ankara–Sivas · Main contractor (as provided): Çelikler
Construction photographs showing reinforced concrete viaducts, bridge decks, form travellers and balanced cantilever bridge works along the Ankara–Sivas high-speed railway corridor.
Location: Azerbaijan · Project: Fuzuli–Shusha Road · Structure: Viaduct 4 · Main contractor: Kolin Construction
Bridge construction works on the Fuzuli–Shusha road corridor. Construction photographs provided by the project team.
Artvin, Türkiye · Hopa–Borçka State Road · Main road contractor: Çelikler Holding · Balanced cantilever bridge construction
Construction of the Subaşı Viaduct, a twin-carriageway balanced cantilever structure linking the Cankurtaran tunnel section. Public project records describe approximately 120 m and 106 m bridge lengths for the two carriageways. The photographs show the form-traveller and reinforced-concrete works during construction.
Viaductul Subaşı – Drumul Hopa–Borçka (sectorul Tunelului Cankurtaran), Artvin, Turcia. Antreprenorul drumului: Çelikler Holding. Construcție prin metoda consolelor echilibrate; fotografii din timpul execuției.
2025–2026 · Length 665 m · Height 52 m · Kolin Construction
Nădășelu – Mihăiești, Cluj / Romania
Scope of Works: 260 m balanced cantilever bridge · 960 m conventional bridge
Selected bridge, viaduct, railway and highway works from the project portfolio of Sümerkan Construction, the company behind SONEC in Romania. The Ankara–Istanbul High-Speed Railway corridor includes major viaduct and tunnel engineering works; individual Sümerkan work packages are described below.
These are Sümerkan Construction portfolio references and are not represented as separate SONEC Romania contracts. Project descriptions identify documented work scopes; photos may illustrate a broader project group.
Railway viaducts, cut-and-cover tunnel, overpass and foundation excavations.
VK-12 and VK-26 railway viaducts and foundation works.
Three overpasses and two underpasses.
Berta, Akarsın, Sengan, Budan, Ortaköy and Sakalar viaducts; balanced cantilever construction.
Karasu and Sakarya bridges, overpasses, underpasses and foundation excavations.
Çamlıkaya and Taşlıca viaducts, underpasses, culverts and excavations.
Overpass, underpasses, culverts and excavation works.
Karasu bridges, overpass, underpass and demolition works.
Bridges, overpasses, drainage and foundations for Gülburnu Bridge.
Junction bridges, river bridges, overpasses, culverts and road drainage.
Bridge replacement and Piraziz overpass.
Yeşilırmak and Mert River bridges and an underpass.
Mansap and Cebri Boru bridges and foundation excavations.
Mezit 1, 2 and 3 bridges.
Örencik, Mengen, Seben and Doğancı bridges, including a steel-framed composite structure.
Five bridges and riverbank improvement works.
Sundura Bridge and Artvin interchange overpass.
Three bridges over the Çoruh River and foundation excavations.
Miliç, Terme and Karaboğaz bridges.
Akçay, Curi, Cevizdere, Sazlık and Küçükırmak bridges.
Eleven bridges along the Ünye–Bolaman road.
Alıçlı bridges, Pirahmet Bridge, retaining structures and foundations.
Bridge pier strengthening and riverbed protection.
Bridge construction over the Kızılırmak River.
Upper-half excavation works for tunnels 3 through 7.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Bridge and infrastructure construction works recorded in the company project portfolio.
Contact our team to discuss your next construction, infrastructure or engineering project.
Str. Piața 1907, Nr. 3
Cluj-Napoca, Cluj, Romania