Protection from the destructive waves of the Baltic Sea opened up the opportunity to improve the territory and create a new beach.
Goal:
Development of the recreational potential of the resort city Zelenogradsk through the implementation of bank protection measures with the possibility of subsequent restoration and improvement of the beach on the Baltic Sea.
Objective:
Development of design and working documentation for the reconstruction of the emergency complex of bank protection structures of Zelenogradsk with a length of 1663 m with the restoration of the destroyed slope of the coast and the partial reconstruction of stairways. Implementation of architectural supervision.
Negative factors at the design site:
– wave action – wave pressure on the structure when the wave crest approaches 1.47 t/m2;
– wind loads – the probability of storms (including extreme ones) with gusts;
– development of slope processes of the bank slope.
During the years of operation, the existing bank protection structures were significantly damaged and were mostly in disrepair – therefore, they ceased to fully fulfill their function.
Under the influence of negative factors, the processes of abrasion and erosion of the coastline have intensified. The rate of destruction of the coastline was about 1 m per year, there were risks of deformation of buildings and structures located on the coast.
One of the conditions facing the engineers of the GEOIZOL Project was to design the structure without entering the Baltic Sea, which made it possible to avoid passing an environmental review and start construction work as soon as possible.
The reconstruction of the coast protection structures was a preparatory stage for the subsequent reclamation of beaches on this section of the coast, which was part of the plan for the development of the recreational component of the federal resort.
From a structural point of view, the installation of a corner wave barrier retaining wall on a pile foundation was adopted in combination with a flexible wave-damping structure in the form of riprap, washout protection in the form of a sheet pile wall and anti-erosion protection. The structure serves to protect the existing bank from the effects of waves and is not a beach-retaining structure.
After the dismantling of the existing emergency structures, the soil is excavated to the design levels, enclosing sheeting is arranged and reinforced concrete piles are driven.
Under concrete preparation is carried out on the top of the piles.
Concreting of the retaining wall is carried out in two stages – first a horizontal, then a vertical slab is arranged. On the lower side, the wall has a control tooth of a periodic profile, designed to hold riprap.
On the back side of the wall, a drainage prism is poured with crushed stone of a fraction of 20-40 mm.
On the front side, the corner wall is filled with stone boulders with a diameter of at least 665 mm and a mass of at least 399 kg.
The wave-permeable riprap wall design is characterized by a reduced ability to reflect waves, which does not increase the erosion of the overwater strip of the beach.
On separate damaged sections of the slope, anti-erosion mats are laid, fixed with driven soil anchors, followed by sowing of grasses. Existing green spaces are preserved as much as possible.
The building is connected with five stairways to the sea. For three of them, reconstruction of the lower spans is provided. The spans of one descent were partially dismantled and then restored for the reconstruction of bank protection structures. One descent was completely reconstructed.
The result:
New bank protection facilities have been successfully built, which made it possible to proceed to the next stage – the creation of a new beach within the boundaries of a resort of federal significance
Customer: GBU KO “Baltberegozashchita”
General contractor: OOO Yantarservisbaltik
General designer: OOO GEOIZOL Project
Implementation: 2017 – 2021
For more information on coastal protection measures, see the Coastal Strengthening section.
