The first cable anchorage of the bridge to Russky Island has been erected on the Nazimov Peninsula in Vladivostok. Each anchorage is strongly individual and requires maximum accuracy during erection.
Cable anchorage
The cable anchorages are being erected simultaneously with the installation of reinforced concrete decks between piers М1-М5 on the Nazimov Peninsula and М12-М8 on Russky Island. Each 72 m long span deck will be constructed from prestressed concrete. In addition to conventional reinforcement, the steel strands will be threaded through plastic tubes. After pouring concrete, the strands will be jacked with a tension force of 300 – 350 t to become pre-stressed. The deck will also be reinforced with Dywidag high-tensile reinforcement. This advanced method ensures maximum structural strength of the large-span decks. The total length of the reinforced-concrete girder deck is 320 m on each side.
Reinforced-concrete girder on Nazimov peninsula
During reinforcement, the construction team will also erect cable anchorages for attaching stay cables. This work requires maximum accuracy. The first anchorage has already been prepared for concreting on the Nazimov Peninsula. The anchorage is a low-alloy steel pipe: It is 377 mm in diameter, 3.2 m long, and weighs about 1 t.
The stay cables will be attached at various angles. Each stay cable will have two anchor assemblies – one on the deck and one on the pylon; both must precisely face each other. Construction of the pylon takes place simultaneously with construction of the girder deck and installation of the anchorage, which complicates the work of the construction team. That is, the anchorage on the deck must be installed at once with respect to an identical anchorage that will be erected on the pylon at the 207 m mark. Moreover, special consideration must be given to all potential deformations of the main and auxiliary structures during construction.
Daniil Goncharuk / SK MOST
Photo by Igor Lischuk / SK MOST
© SK MOST