Robert Jansen
Technical Sales Manager
Harbour works place extreme demands on earth-retaining structures: high loads, salt water, and a long service life. Deepro strand anchors ensure the stability and durability of quay walls, jetties, and mooring structures, even under permanent brackish and marine conditions.
Anchors for port works secure earth-retaining structures in sea, inland, and industrial ports. These include quay walls for container terminals, RoRo berths, and bulk quays, sheet pile walls along fairways and quay structures, and walls of dry docks and locks.
The wall absorbs earth pressure and water pressure, together with loads from crane tracks, storage, traffic, and moored vessels. The wall is anchored at greater overturning heights and heavier loads. The strand anchor transfers the horizontal tensile forces to a stable ground layer behind the slip plane. The system offers high anchoring force in a slender profile and is suitable for implementation in operational port areas.
Maritime environments present an additional dimension in harbour works. Saltwater, tides, wave action and the cathodic protection of steel sheet piles place high demands on corrosion protection. Effective coordination between the anchoring system and other protective measures is crucial for service life.
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In the design and execution of anchors in port works, several factors together determine the functioning of the construction. In addition to the geotechnical and structural aspects, the marine environment plays a dominant role:
Early alignment between the designer, contractor, port authority, and anchor supplier prevents surprises during execution and safeguards both the schedule and the desired lifespan of the port construction. In port areas, continuous operation is often a strict prerequisite.
An anchored harbour structure consists of a retaining wall, a purlin and an anchoring system that transfers horizontal forces to the subsoil.
The wall is usually a combi-wall of tubular piles with intermediate planks, or a heavy sheet pile. This takes up ground pressure, water pressure, and specific harbour loads, from crane tracks, container stacks, bulk storage, and berthed vessels, and transfers these through bending and clamping in the base. Cyclic loads from tides and collisions require explicit consideration of fatigue in the design.
The purlin or distribution beam is placed at or just below ground level. This distributes the concentrated anchor forces evenly over the wall and prevents local deformations at the anchor head.
The strand anchor consists of an anchor head with wedges, a free length in a duct, and an anchored length which transfers force to the ground via grouting. The tensile force from the wall is thus transferred to a stable soil layer behind the active slip surface.
The wand, purlin, anchor head, and anchored length work as one system that is mechanically and corrosion-protection-wise tailored to the marine environment.
Every situation is different. In a consultation, we will clearly outline your project and possibilities. You will immediately know where you stand.
Robert Jansen
Technical Sales Manager
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For virtually all earth-retaining structures in and around ports, including quay walls for container, RoRo and bulk terminals, sheet piles along fairways, jetty and mooring structures, and walls of locks and dry docks. The anchoring system is identical; the chosen corrosion protection class and geometry are dictated by the application and marine conditions.
Deepro's strand anchors have a multi-layer construction: prestressing steel according to EN 10138, individual PE sheathing of the strands with anti-corrosion compound, a PE sheath tube, and grout in both the free and anchored sections. In PL3, full electrical insulation is added. This construction has been specifically assessed for permanent application in aggressive environments.
In the case of sheet piling with cathodic protection, a metallic path via the anchor can cause corrosion or unwanted current leakage. The electrically insulated PL3 anchor completely interrupts this path, keeping the cathodic protection system effective. Deepro is currently the only provider in Europe to supply this with ETA certification.
Yes. Stress corrosion and hydrogen embrittlement are the two dominant degradation mechanisms for prestressing steel in a marine environment. The steel used complies with EN 10138 and, in combination with multi-layer PE sheathing, anti-corrosion compound, and (for PL3) full electrical insulation, is demonstrably resistant to both mechanisms. Suitability is guaranteed via the ETA at system level.
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