{"id":20069,"date":"2026-01-16T10:13:51","date_gmt":"2026-01-16T09:13:51","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20069"},"modified":"2026-06-10T12:38:07","modified_gmt":"2026-06-10T10:38:07","slug":"underwater-foundation","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/underwater-foundation","title":{"rendered":"Underwater foundation"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Underwater foundations support structures in and adjacent to bodies of water. They secure bridge piers, quay facilities, locks, offshore structures, and shoreline protections. Planning and execution differ significantly from land-based foundations: water, currents, limited visibility, corrosion, and scour act as additional boundary conditions. Special methods and tools are used for construction, repair, inspection, and deconstruction. In practice, underwater foundations touch many application areas-from concrete demolition and special demolition to rock excavation and tunnel construction. Where controlled deconstruction is required, <strong>concrete demolition shear<\/strong> as well as <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a> from Darda GmbH play a technical role because they operate with low vibration and are suitable for sensitive aquatic zones.<\/p>\n<h2>Definition: What is meant by an underwater foundation?<\/h2>\n<p>An underwater foundation is a foundation that is constructed, operated permanently, or dismantled wholly or partly below a free water surface. This includes pile foundations, caissons, sheet pile cofferdams, and shallow-founded foundation bodies located in tidal zones, rivers, lakes, or the sea. Underwater foundations transfer structural loads into competent soil layers or rock and resist additional actions from currents, waves, buoyancy, abrasion, and corrosion. The term also covers temporary works that remain submerged during parts of the construction sequence. Interfaces to the splash and tidal zones require detailing for cyclic wetting and drying, chloride ingress, and mechanical impact.<\/p>\n<h2>Types and construction methods of underwater foundations<\/h2>\n<p>The choice of foundation type depends on subsoil, water level, loads, and site logistics. Common variants are:<\/p>\n<ul>\n<li><strong>Pile foundations<\/strong>: driven piles or bored piles in reinforced concrete or steel, singly or as pile groups with pile caps. Suitable for soft sediments and large water depths. Installation method, noise limits, and drivability govern feasibility.<\/li>\n<li><strong>Caissons<\/strong>: prefabricated or in-situ fabricated reinforced concrete boxes that are lowered, aligned, and filled with underwater concrete. Allow high precision and rapid installation in narrow tidal windows.<\/li>\n<li><strong>Sheet pile cofferdams<\/strong>: closed sheet pile geometries, filled internally or used as a dewatered excavation with bracing. Enable dry working conditions where soils permit.<\/li>\n<li><strong>Shallow foundations<\/strong>: massive foundation slabs or blocks on compacted subgrade or rock with scour and erosion protection. Often combined with riprap aprons or mattresses.<\/li>\n<li><strong>Rock anchors and micropiles<\/strong>: for securing on bedrock or in confined conditions. Transfer loads through tension, compression, or shear into rock.<\/li>\n<\/ul>\n<h3>Construction methods<\/h3>\n<p>Underwater, concrete is often placed as <em>tremie concrete<\/em>. In this process, a continuous column of concrete flows through a pipe down to the subgrade to avoid washout. The pipe outlet remains embedded in fresh concrete to prevent dilution. Mixes are verified using washout tests and flow parameters. Alternatively, it is pumped or cast in dewatered boxes. For foundations on rock, drilling followed by grouting and anchor technology is common. Precise level control, joint treatment, and cleaning of bearing surfaces are decisive for long-term performance.<\/p>\n<h2>Materials and material concepts<\/h2>\n<p>Underwater foundations require durable construction materials. Important aspects are:<\/p>\n<ul>\n<li><strong>Underwater concrete<\/strong> with anti-washout protection, dense matrix, and adjusted consistency. Admixtures reduce segregation, ensure workability, and provide early strength. Self-compacting characteristics support uniform placement and reduce laitance.<\/li>\n<li><strong>Reinforcement protection<\/strong> through sufficient concrete cover, appropriate exposure classes, and supplementary measures such as coatings or cathodic systems where specified for the project. In high-chloride zones, stainless reinforcement or non-metallic reinforcement may be considered.<\/li>\n<li><strong>Steel components<\/strong> with corrosion protection systems, for example multilayer coatings and constructive water drainage. Details should minimize crevices and allow inspection.<\/li>\n<li><strong>Scour and erosion protection<\/strong> using riprap, mattresses, geotextiles, or concrete blocks. Filter-stable layering prevents piping and undermining.<\/li>\n<li><strong>Joints and penetrations<\/strong> with waterstops, hydrophilic seals, and robust edge protection to maintain watertightness and impact resistance.<\/li>\n<\/ul>\n<h2>Design and actions<\/h2>\n<p>In addition to permanent and variable loads, hydrodynamic forces act. Designers consider:<\/p>\n<ul>\n<li>Currents, waves, ship traffic, and ice loads<\/li>\n<li>Buoyancy and hydrodynamic suction effects<\/li>\n<li>Scour formation, abrasion due to suspended solids and debris<\/li>\n<li>Fatigue and dynamic actions<\/li>\n<li>Soil parameters under saturation, settlements, and creep<\/li>\n<li>Marine growth and added mass effects influencing drag and inertia<\/li>\n<li>Seismic actions and potential liquefaction in saturated soils where relevant<\/li>\n<\/ul>\n<p>The design follows the technical rules applicable to the project. Safety concepts, partial safety factors, and verifications are to be defined on an object-specific basis. Physical model tests and computational fluid dynamics can support hydraulic design and scour prediction. Provisions for inspectability and maintainability should be embedded into the design from the outset.<\/p>\n<h2>Execution: construction under water<\/h2>\n<p>The construction sequence depends on water depth, tidal windows, and logistics. Typical steps are:<\/p>\n<ol>\n<li>Surveying, subsoil investigation, and definition of temporary works<\/li>\n<li>Construction of sheet pile cofferdams or installation of caissons<\/li>\n<li>Foundation preparation: soil removal, formation level, drilling and grouting<\/li>\n<li>Reinforcement installation and underwater concreting (tremie or pump method)<\/li>\n<li>Curing, quality assurance, scour and shoreline protection<\/li>\n<li>As-built documentation, bathymetric checks, and acceptance testing<\/li>\n<\/ol>\n<h3>Quality assurance<\/h3>\n<p>Underwater, control is performed using diving inspections, sonar, concrete records, and, where applicable, test cores. Documentation and monitoring are central components of construction supervision.<\/p>\n<ul>\n<li>Concrete: verification of mix identity, temperature, density, washout loss, and flow parameters<\/li>\n<li>Geometry: level tolerances, embedment, and cover measurements using calibrated gauges and sonar<\/li>\n<li>Materials: coating thickness checks, reinforcement grade certification, and traceability<\/li>\n<li>Scour protection: placement verification, filter integrity, and edge detailing<\/li>\n<\/ul>\n<h2>Maintenance and typical damage patterns<\/h2>\n<p>Underwater foundations age due to water chemistry, currents, and mechanical loading. Frequent findings are:<\/p>\n<ul>\n<li>Washouts and scour at the foundation edge<\/li>\n<li>Cracks, spalling, and exposed reinforcement in the splash zone<\/li>\n<li>Abrasion from sediment transport and cavitation in flow-adjacent zones<\/li>\n<li>Chloride-induced corrosion on reinforced concrete and steel parts<\/li>\n<li>Microbiologically influenced corrosion and coating breakdown in stagnant or polluted waters<\/li>\n<\/ul>\n<p>Rehabilitation uses concrete technology measures, injections, jacketing, and strengthening. For local deconstruction under water, controlled, low-vibration methods are advantageous. Maintenance planning benefits from risk-based inspection intervals and clear acceptance criteria for repair completion.<\/p>\n<h2>Deconstruction, rehabilitation, and special demolition<\/h2>\n<p>During deconstruction, loads are removed segment by segment to limit turbidity, noise, and vibration. In sensitive areas, the <strong>concrete demolition shear<\/strong> from Darda GmbH is frequently used. It crushes concrete on the member, separates reinforcement visibly, and enables transport of individual segments. Where drilling is possible, the <strong>hydraulic splitter (wedge)<\/strong> allows a controlled splitting technique-even in the tidal or splash zone. This approach fits within the application areas of <a href=\"https:\/\/www.darda.de\/en\/applications\/concrete-demolition-and-special-deconstruction\">concrete demolition and deconstruction<\/a> as well as special assignments with tight environmental windows. Debris management should include silt curtains or containment booms and defined lifting points for safe recovery.<\/p>\n<h3>Tool selection and hydraulics<\/h3>\n<p>Hydraulic tools are powered via a <strong>hydraulic power pack<\/strong> on a pontoon or from shore (<a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">Power units<\/a>). Hose routing and couplings must be planned to be diver-friendly, well secured, and protected from damage. For cutting steel sections, sheet piles, or reinforcement, <strong>steel shear<\/strong> or Multi Cutters from Darda GmbH are suitable where material-selective deconstruction is specified. Pressure and flow matching, quick-coupling compatibility, and protection against hose bursts are integral to safe and efficient operation; the use of environmentally considerate hydraulic oils can reduce ecological risk.<\/p>\n<h3>Rock exposure and removal<\/h3>\n<p>If the foundation meets rock, <strong>rock wedge splitter<\/strong> can open the rock in a controlled manner. This is particularly useful when adjusting bearing areas, remediating scour, or removing protruding rock ribs. The use intersects the fields of rock excavation and tunnel construction as well as natural stone extraction when blocks are to be released in a targeted manner. Predefined drilling patterns and staged splitting help control fragment size and limit turbidity.<\/p>\n<h2>Environmental and occupational safety<\/h2>\n<p>Work on the underwater foundation requires strict safety and environmental management. Key aspects are:<\/p>\n<ul>\n<li>Diver safety, permits, communication, and rescue concepts<\/li>\n<li>Hose and line management for hydraulics in a wet environment<\/li>\n<li>Minimization of turbidity and sediment load, e.g., through careful segmentation<\/li>\n<li>Reduction of noise and vibration, for example using splitting methods instead of percussive methods<\/li>\n<li>Separate collection of concrete, steel, and coatings for recycling<\/li>\n<li>Use of silt curtains, containment booms, and waste capture nets where appropriate<\/li>\n<li>Compliance with hyperbaric work procedures and gas management for pressurized operations<\/li>\n<li>Spill prevention and response readiness, including drip trays and absorbents<\/li>\n<\/ul>\n<p>Permits and ecological requirements must be observed on a project-specific basis. Any information provided here is general and non-binding; the applicable codes and regulatory determinations in the respective project are authoritative.<\/p>\n<h2>Planning and logistics<\/h2>\n<p>Underwater construction sites are logistically demanding. Success factors are:<\/p>\n<ul>\n<li>Make optimal use of tidal and weather windows as well as current velocities<\/li>\n<li>Pre-assembly on land, modular components, and short installation times<\/li>\n<li>Redundant lifting and safety equipment on pontoons and workboats<\/li>\n<li>Clear interfaces between dive team, crane, concrete logistics, and quality assurance<\/li>\n<li>Contingency planning for equipment failure and weather downtime, including critical spares<\/li>\n<\/ul>\n<h2>Application areas related to Darda GmbH tools<\/h2>\n<p>Underwater foundations touch several application areas in which tools from Darda GmbH typically appear:<\/p>\n<ul>\n<li><strong>Concrete demolition and special demolition<\/strong>: segment-by-segment removal with concrete demolition shears, splitting massive cross-sections with hydraulic splitter (wedge).<\/li>\n<li><strong>Rock excavation and tunnel construction<\/strong>: exposing and profiling rock bearing surfaces with rock wedge splitters, controlled rock removal without blasting pressure waves.<\/li>\n<li><strong>Gutting and cutting<\/strong>: separation of reinforcement and steel components with steel shear or Multi Cutters, supported by hydraulic power pack.<\/li>\n<li><strong>Special assignment<\/strong>: work in ecologically sensitive zones, in the tidal area or with restricted accessibility, where low-vibration methods offer advantages.<\/li>\n<\/ul>\n<h2>Practical notes for tendering and execution<\/h2>\n<p>Precise specifications are crucial for economical and safe implementation. Recommended are:<\/p>\n<ul>\n<li>Clear indication of water levels, currents, and visibility ranges<\/li>\n<li>Definition of permissible limits for turbidity, noise, and vibration<\/li>\n<li>Specifications for segment size during deconstruction and for material separation<\/li>\n<li>Proof requirements for concreting procedures, sampling, and monitoring<\/li>\n<li>Documentation of scour protection measures and their control<\/li>\n<li>Qualification requirements for diving teams and supervisors, including procedures for dewatered and submerged works<\/li>\n<li>Stipulation of acceptance criteria for anti-washout concrete and surface cleanliness of bearing areas<\/li>\n<\/ul>\n<h2>Diagnostics and monitoring<\/h2>\n<p>For condition assessment of underwater foundations, specialists combine diving inspections, ROV footage, sonar measurements, and concrete technology testing. Additionally, non-destructive methods are used to assess thickness, delaminations, or voids. Continuous monitoring supports the early detection of scour and erosion processes. Instrumentation can include scour probes, settlement markers, strain or tilt sensors, and corrosion monitoring systems. Data management with georeferenced logs and periodic re-surveys enables trend analysis and targeted intervention.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Underwater foundations support structures in and adjacent to bodies of water. They secure bridge piers, quay facilities, locks, offshore structures, and shoreline protections. Planning and execution differ significantly from land-based foundations: water, currents, limited visibility, corrosion, and scour act as additional boundary conditions. Special methods and tools are used for <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/underwater-foundation\">read more&#8230;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"parent":14846,"menu_order":0,"comment_status":"open","ping_status":"open","template":"tmpl\/template-wissen.php","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"class_list":["post-20069","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Underwater Foundation for Marine Structures<\/title>\n<meta name=\"description\" content=\"Expert guide to underwater foundations \u2713 design, piles, caissons, cofferdams &amp; scour protection for marine structures.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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