Underwater wall in the Port of Klaipeda

AS LNK INDUSTRIES
Skanstes iela 27, Rīga,
Latvija, LV-1013

Tel.: +371 6743 9900
email: office@lnk-industries.lv

Location

Klaipeda, Lithuania

Commissioned by

Port of Klaipeda (Lithuanian: Klaipėdos jūrū uostas)

Project type

DTH drilling

Sweco

Started

2020

Completed

Planned in 2024

*North breakwater of the Port of Klaipeda, Street Vetros, South breakwater in Street Smiltines, Klaipeda reconstruction and strengthening project for the slope of the Curonian Spit

The port of Klaipeda is consistently the number one cargo port in the Baltics. In partnership with LNK Industries, the Lithuanian port completed one of its most significant development projects at the southern pier – constructing a retaining wall. It is the first retaining wall of its kind built in Lithuania, in the port of Klaipeda. As a result of the reconstruction of the port, not only will it be possible to deepen it but also widen the channel and expand the infrastructure.

At first, the pier reconstruction, worth 49 million euro, was entrusted to the German company Depenbrock and the Belgian company Herbosch-Kiere. At the later stage, piling and anchoring works worth over 24 m euro was taken out of the initial project and awarded to LNK Industries as a general contractor.

Despite numerous challenges, LNK Industries successfully completed constructing the port’s underwater retention wall. In addition to purchasing high-tech equipment, the company hired Finnish drilling rig operators, work managers, and engineers for the project to ensure a high-quality execution.

The project consisted of 3 stages – RD-pipe wall of 200 meters in length, 125 meters and installation of underwater anchors in certain sections of the retention wall. The pipes used were d813, driven to the depth of -7 meters below the water surface and ranging in length from 14 to 31 meters. The pipes were driven through the body of the breakwater that consisted of concrete cubes, boulders and tetrapods.

Construction was conducted using floating structures and platforms in the narrowest part of the port, near the gate, where ship traffic is heavy. For pipe drilling, SIA “Technorent” rebuilt and equipped the BG36 pile drilling rig with special equipment and tools from Finland. Steel pipes D813 in lengths ranging from 14.3 m to 31 m were connected together to form a bottom-tight structure of the underwater wall. SIA “Technorent” used a DTH drilling technique to drill through granite, massif blocks and tetrapods without dismantling the existing pier structure. Nowadays, this technique is widely used for drilling large piles in granite.

The weather and geological conditions affected work processes at the port of Klaipeda, as did navigational difficulties. Therefore, the teams worked around the clock to meet the tight deadlines.