Turkmenibat-Farap Bridge, Turkmenistan
Bridgemaster® selected for waterproofing of longest metal span bridge in Central Asia.
The newly built M37 Turkmenabat–Farap road is located in Turkmenabat, the capital of Lebap Province, in the east of Turkmenistan. For part of its route it is carried by the new 1.6 km Turkmenabat-Farap Bridge which is now the longest continuous metal span bridge in Central Asia.
The new bridge consists of two continuous beam system decks, each 800 m long, carrying four traffic lanes (two in each direction) and pedestrian footpaths on either side of the bridge, across its 21.23 m width.
This new route will provide easy access through Turkmenistan to Uzbekistan and onwards to China. Before the new road and bridge was built, it could take up to three days to cross from Turkmenabat to Uzbekistan due to the significant queues that would form at the previously used small pontoon bridge. The construction of the new road bridge now allows this journey over the river Amu Darya and on to the border with Uzbekistan to be completed within 2-3 hours.
State Concern Turkmenavtohowayollary
LLC Road Building "ALTCOM"
- Turkmenabat - Farap bridge
Design and construction of the bridge was a technical challenge that was successfully met by two Ukrainian companies: Altcom Road Construction Ltd and design and engineering company Soyuztransproek Ltd.
In addition, companies from more than fifteen countries were involved in the project right from the start offering technical advice on design and product selection. As leaders in the development of waterproofing systems and pioneers of cold applied systems, Stirling Lloyd were invited to sit alongside other external experts and technologies as they were perceived as being able to offer the best advice and product solutions in their area of expertise, namely deck waterproofing and surfacing, for this challenging project.
The bridge’s location is characterised by complex geological, hydrological and climatic conditions, including an average seismicity of magnitude 8. In addition, during Spring and Summer, weather conditions often results in significant rain fall and flooding in the vicinity, so it was important that the selected waterproofing and surfacing solution could withstand these severe climatic conditions.
Stirling Lloyd’s recommendation was the use of the combined waterproofing and wearing course system - Bridgemaster®. Its use would result in an 80% reduction in dead weight when compared to the traditionally used asphalt surfacing layer, increasing the dynamic load the bridge could carry and allowing a lighter design to be used.
In addition Bridgemaster® would provide an extremely high bond to the metal deck, enabling the waterproofing and surfacing to act as a composite with the deck – an important feature in an area of such high seismic activity and the likely movement of the deck.
The system also offers excellent skid resistance properties and is tolerant to difficult climatic conditions during application and severe climatic conditions once in-situ – critical attributes in this demanding application.
Consequently Stirling Lloyd’s Bridgemaster® system was specified for this paved bridge with a steel orthotropic plate – its first such application in Central Asia.
Utilising Stirling Lloyd’s proprietary Esselac® resin technology and
consisting of an impermeable flexible resin screed, an aggregate overscatter and a durable sealer coat, for its first application in Central Asia, Bridgemaster® was applied to a depth of 12 mm on the roadway and 8 mm on the pedestrian footpath, reducing the seismic loadings on the structures orthotropic steel plate.
The systems ease of application and rapid cure, even at the low temperatures experienced helped ensure a quick installation with Authorised Contractor LLC Road Building “Altcom” being able to apply up to 3,000 m2 of the full system per day.
As in the design and specification stages, Stirling Lloyd provided complete technical assistance during the application as well as
hands-on training and supervision ensuring a quick response / solution was provided to all the technical and climatic challenges that arose.
Once the application was complete, Bridgemaster® had provided the
Turkmenabat-Farap Bridge with a durable, waterproof lightweight surfacing that was more than capable of dealing with the climatic
conditions and heavy traffic loads it would face.
Kostiantyn Medovnikov, sales export manager for Central and Eastern Europe at Stirling Lloyd comments: “As this was such an important international trade route for the country, it was important for the waterproof surfacing on the bridge to be as long lasting as possible and with such severe climatic conditions to contend with, it was clear from conception stage that Bridgemaster® was the best suitable long-term protection solution.”
Stirling Lloyd played a vital role in the successful completion of the Turkmenabat-Farap Bridge project by recommending and delivering a quality protection system for this new structure and its unique characteristics and challenges. Bridgemaster® provided waterproofing and surfacing for the 34,000 m2 deck of the bridge, offering long-term
protection for the new structure.