B3 is Bridge 3 in Georgia’s Kvesheti–Kobi road project: a reinforced-concrete arch bridge crossing the Khadistskali River. Project reports describe twin box-section arch ribs built outward in cantilevered segments, with temporary cable tie-backs and form travellers helping support and control the incomplete arch. “B3” is the project’s identifier, not a general bridge type.
Where is the B3 bridge?
B3 crosses the Khadistskali River in Lot 2 of the Kvesheti–Kobi road project, part of Georgia’s North–South Corridor. The Roads Department of Georgia’s project documents identify it as the “B3 – Arch bridge over the River Khadistskali.” The wider road project includes new highway sections, bridges and tunnels; B3 is one bridge, not a tunnel or a name for the whole route. The corridor serves mountainous terrain where winter weather and avalanche risk can disrupt access. The Roads Department’s January–June 2022 monitoring report gives broader Lot 2 context and lists the Asian Development Bank and European Bank for Reconstruction and Development as project funders.
What kind of arch bridge is B3?
Contractor-related project reports describe B3 as an upper-deck, or deck-type, reinforced-concrete arch with two separated box-section arch ribs. The bridge deck sits above the arch ribs, which carry loads from the deck and transfer them toward their supports. The reported main arch span is 286 m: the August 2026 release calls it a clear span, while the October 2026 report calls it a net span. Those terms are source-specific and should not be treated as proof of identical measurement conventions.
Bridge dimensions vary by source and date, so the figures are best read with their original descriptions rather than combined into a single definitive specification.
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| Figure | Source and wording |
|---|---|
| 426 m overall length; 164 m height; three lanes | Roads Department of Georgia, 2019 Lot 2 project document. |
| 437.875 m total length; 286 m main arch clear span | China Railway 23rd Bureau Group/PRNewswire-related project reporting, August 2026. |
| 437.875 m total length; 286 m main arch net span; 164 m from deck to valley floor | China Railway 23rd Bureau Group/PR Newswire APAC contractor report, October 2, 2026. |
The available reports do not explain why the 2019 length differs from the 2026 total length, or whether the height and deck-to-valley figure use the same reference points. These are published project figures, not independent remeasurements. A minister quoted by the Roads Department in a July 2026 update described a 166 m-high arch bridge under construction; that figure also differs from the 164 m measurements above, and the update does not reconcile them.
How is B3 being built?
Project reporting identifies cantilever casting with form travellers and a cable-stayed tie-back or anchoring system. In a cantilever sequence, crews extend the arch progressively from its supports rather than relying on a continuous temporary scaffold spanning the valley. Form travellers support and position the work at the advancing end as successive concrete segments are formed. Temporary stays and anchorage help hold and control each incomplete portion while construction proceeds; the opposing sides must ultimately be brought together at the arch crown.
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This explains the reported method in general engineering terms, not a complete B3 construction procedure. The published accounts do not specify the bridge’s segment lengths, cable-force schedule, foundation design, detailed pour sequence or closure tolerances. The contractor’s October 2, 2026 report says project discussions covered arch alignment and stress control, cable hoisting, construction procedures, intelligent monitoring, winter safety and high-precision closure control; it is not a detailed method statement or independent audit.
Why do wind and winter conditions matter?
During cantilever construction, the arch is incomplete and its structural response differs from that of the finished bridge. Wind can affect the exposed, advancing sections and the temporary support system, so construction-stage checks matter alongside checks for the completed structure. B3’s setting adds severe weather considerations: an August 2026 project release described Level 9 winds, temperatures as low as −20°C and snow accumulation up to 2 m. The release does not give the wind averaging interval or measurement convention, so Level 9 should not be converted into a single precise wind speed.
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The same release says physical wind-tunnel tests were carried out at Hunan University’s National Key Laboratory of Bridge Engineering Safety and Resilience. It reports tests for critical construction stages and the completed-bridge configuration, with particular attention to the planned asymmetric arch-ring closure. According to that release, predicted vibration, deformation and stress during closure would remain within contractual or specification limits, and the completed bridge would meet operational wind-safety requirements. Those are project-reported conclusions; the underlying laboratory report and test parameters are not provided in the cited account.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the latest reported construction status?
On July 15, 2026, the Roads Department said construction was continuing and described an arch bridge as under active construction. Contractor-related reporting identified main-arch closure as a 2026 milestone. An October 2, 2026 contractor report documented a site visit and ongoing work, but did not confirm that the arch had closed. The latest status established by these reports is therefore that closure was a target, not a confirmed completed event.
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In the Roads Department’s account of its July 2026 site inspection, Georgia’s Infrastructure Minister Revaz Sokhadze called it “a unique engineering structure — a 166-metre-high arch bridge with no equivalent in the region.” That is an attributed project statement, not an independently verified regional comparison.
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