In the period from October to November 2008, GT Morstroy completed the construction of the Rear Leading Beacon ZSZ-2 of the approach section of Kronshtadt Shipping Channel in the area of the S-1 shipping passage.
Due to the lack of engineering and geological surveys at the Rear Leading Beacon installation site, dynamic tests of piles were carried out before the construction to determine their bearing capacity depending on the ground. The planned arrangement and depth of the piles-shells driving were adopted on the base of the results of pile dynamic tests.
The hydrotechnical beacon foundation is a high pile grillage with a monolithic reinforced concrete upper structure on metal piles-shells of 1220 mm diameter, 24 mm wall thickness driven to elevation of minus 24.5 m.
The hydrotechnical foundation of the beacon is designed for wind load (area II according to SNiP 2.01.07-85) and ice load 470 tons corresponding to impact of a moving ice field of up to 60,000 m2 area and up to 1 m thickness.
The hydrotechnical foundation top structure is equipped with mooring devices and 400 mm tubular fenders for mooring small ships.
The hydrotechnical foundation is equipped with a 40 m high bearing structure with day visibility shields and lighting equipment.