The main steel stiffening girder of the bridge over the Eastern Bosphorus Strait in Vladivostok is now beyond the 800-meters milestone after paired panel number 37-38 has been lifted to the 70-meter elevation from the strait water on the Russky Island side.
As a result of this operation, the cantilevered part of the steel stiffening girder on the Russky Island side extends now over a distance of 390 meters from the M7 Pylon centerline toward the mainland. A total of 414 meters of the span deck have been installed on the Nazimov Peninsula side where paired panel number 39-40 has been lifted to the elevation of 70 meters. The total length of the opposed cantilever sections of the main steel stiffening girder is now 804 meters or 72.8% of the total length of the 1104-meter long channel span of the bridge to the Russky Island.
Photo by Igor Lischuk / SK MOST
The builders of the bridge over the Eastern Bosphorus Strait proceeded with the tensioning of the 29th pair of stay cables on the Nazimov Peninsula side. According to the approved color pattern for the bridge to the Russky Island, the stay cable pair that has been installed is the first one of the stay cables which will be colored white.
“The Russky Bridge stay cable system will symbolize the national flag of Russia flying over the Eastern Bosphorus Strait,” explains Aleksey Baranov, Director of the OJSC USK MOST Branch in Vladivostok. “A total of 14 pairs of red, blue, and white colored stay cables will be installed on each side of the strait.” They are currently tensioning the 29th pair of stay cables on the Nazimov Peninsula, and the builders have proceeded with installation of the 26th pair of stay cables on the Russky Island. The total length of the stay cables of the bridge over the Eastern Bosphorus Straight is now over 27 kilometers.
The supercompact stay cables of the bridge to the Russky Island are second to none in the world in terms of both the length and design. The stay cables that are currently being installed are longer than 410 meters. The closing stay cables in the channel span will be 580-meters long, a new world record in bridge building. The expected service life of the supercompact stay cables of the bridge to the Russky Island is of 100 to 120 years.
Photo by Igor Lischuk / SK MOST
A state-of-the art Russian-made active fire suppression system has been successfully tested and commissioned during construction of the bridge over the Eastern Bosphorus Strait. The system is designed to lift water to the 350-meter elevation.
This system will fight fires using two methods: simply with water and with temperature-treated water. The latter method consumes a minimum quantity of water that is supplied at the temperature of +200°C under the pressure of 100 atmospheres. When water flows through a special spray nozzle at the end of the firefighting monitor a steam cloud with droplets of 10-50 µm in diameter is formed. Water in this state has many of its physical properties changed, and the man-made fog forms a film on the surface that was set on fire to lower the surface temperature to a significant extent.
When conventional firefighting technologies are used, as little as 10% of water is used directly for fire suppression, and the remaining 90% are just wasted. Everything goes the other way around when the temperature-activated water is used for fire suppression: As much as 90% of water is used purposefully and the water is not lost but rather stays in place as a cloud for almost 40 minutes. Therefore the new method consumes 10 times less water when fire is suppressed outdoors and 50-100 times less when fighting fire indoors.
The active fire suppression system has been installed on the right hand leg of M6 Pylon on the Nazimov Peninsula. The bridge builders, jointly with the designers with the Akva-Piro-Alyans Company, installed the special equipment and firefighting monitors on the self-lift shutter structures. With this arrangement, fire could be prevented simultaneously on both pylon legs. The innovative fire suppression system will be installed on M7 Pylon on the Russky Island shortly.
Photo by Igor Lischuk / SK MOST,
Vitalij Ankov / NPO Mostovik
© SK MOST