{"id":19875,"date":"2025-12-27T11:01:32","date_gmt":"2025-12-27T10:01:32","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19875"},"modified":"2025-12-27T11:01:32","modified_gmt":"2025-12-27T10:01:32","slug":"steel-skeleton","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/steel-skeleton","title":{"rendered":"Steel skeleton"},"content":{"rendered":"
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A steel skeleton<\/strong> forms the load-bearing framework of many industrial, commercial, and high-rise buildings. It enables large spans, flexible floor plans, and fast assembly. In everyday construction practice, steel skeletons are relevant not only for new builds: especially during conversion, refurbishment work, interior demolition, and selective deconstruction, the safe separation of steel and concrete components plays a central role. This is where material-appropriate methods and hydraulic tools from Darda GmbH come into play, such as concrete demolition shear<\/em> or hydraulic splitter<\/em>, which operate with low vibration levels.<\/p>\n

Definition: What is meant by steel skeleton<\/h2>\n

A steel skeleton is a skeletal structural system made of vertical columns and horizontal beams that together transfer loads from self-weight, use, and wind into the foundation<\/strong>. Overall stiffness is provided by frame action, bracing<\/strong>, or core zones. In contrast to massive wall\u2013slab systems, in a steel skeleton the columns and beams primarily carry the loads; partitions and fa\u00e7ades are non-load-bearing and can be modified or replaced. Steel skeletons are often combined with composite slabs (e.g., steel deck with cast-in-place concrete<\/strong>) or with masonry or concrete infill.<\/p>\n

Construction principle and typical components<\/h2>\n

Steel skeleton constructions consist of hot-rolled I\/H steel section<\/strong>, hollow sections, welded plate constructions, or bolted systems. Load-bearing joints are bolted, welded (via weld seam<\/strong>), or\u2014on older structures\u2014riveted. Floor systems range from jack-arch slabs between I-beams to composite slabs and steel beams with an on-site concrete topping. Steel beams are often equipped with fire protection<\/strong> claddings or grouted into concrete, which must be considered during deconstruction.<\/p>\n

Frames, bracing, and joints<\/h3>\n

Frame joints govern stiffness, braces (X-, K-, or V-forms) increase bracing<\/strong>. Connection types influence the dismantling method: bolted connections can be loosened or cut, weld seam<\/strong>s are separated, rivets require shearing or pressing out. The choice of method depends on cross-section, accessibility, and boundary conditions such as noise emission and vibration limits.<\/p>\n

Composite slabs and enclosures<\/h3>\n

Composite slabs couple steel beams and concrete slab via shear connectors. During refurbishment or deconstruction, concrete portions are often removed first, then steel parts are separated. Here, concrete demolition shear<\/strong> are suitable for controlled fragmentation and hydraulic rock and concrete splitters<\/a> for crack-controlled splitting, before steel shears for structural steel<\/a> release steel profiles.<\/p>\n

Existing buildings, refurbishment, and strengthening in steel-skeleton construction<\/h2>\n

Measured interventions are required in existing buildings: strengthening (e.g., welding on plates), replacement of individual beams, concrete topping to increase load-bearing capacity, or renewal of corrosion and fire protection<\/strong>. A thorough survey beforehand is necessary to identify construction era, connections, coatings, and any hazardous substance. Interventions should preserve load paths and include temporary shoring<\/strong>.<\/p>\n

Existing-condition survey and documentation<\/h3>\n

Drawings, probes, and material testing<\/strong> provide clarity on profile types, connection means, concrete thicknesses, and built-in component<\/strong>s. Hidden encasements (e.g., mortar, fireproofing plaster, gypsum fiber) affect the choice of dismantling method. Seamless documentation simplifies planning of cut sequences and coordination with occupational safety<\/strong> and disposal<\/strong>.<\/p>\n

Consider corrosion and fire protection<\/h3>\n

Steel loses load-bearing capacity with increasing temperature, hence fire protection<\/strong> measures (claddings, coatings, concrete encasements) are common. These layers must be removed in a material-appropriate manner during interventions. Corrosion protection<\/strong> systems (e.g., coatings) must be treated with low emissions; the approach follows local requirements and should always consider noise reduction measures and dust suppression<\/strong>.<\/p>\n

Deconstruction of steel-skeleton structures<\/h2>\n

Selective deconstruction follows the principle \u201cfrom non-load-bearing to load-bearing\u201d and \u201cfrom outside to inside.\u201d The goal is safe, low-vibration separation with high material purity through consistent demolition separation<\/strong>. Hydraulic tools from Darda GmbH are powered by dedicated hydraulic power units<\/a> and allow controlled cuts and breaks without area-wide vibration.<\/p>\n