{"id":18916,"date":"2025-10-31T14:41:13","date_gmt":"2025-10-31T13:41:13","guid":{"rendered":"https:\/\/www.darda.de\/removal"},"modified":"2026-03-23T07:28:02","modified_gmt":"2026-03-23T06:28:02","slug":"removal","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/removal","title":{"rendered":"Removal"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Removal denotes the targeted elimination of material from structures or natural rock bodies. In practice, the spectrum ranges from the controlled <strong>concrete deconstruction<\/strong> of elements to <strong>steel cutting<\/strong> and the splitting of rock. Decisive factors are precise force application, the desired crack propagation, and a predictable outcome with respect to piece sizes, emissions, and schedule. Tools such as <strong>concrete pulverizers<\/strong> and <strong>hydraulic wedge splitters<\/strong> form core methods for this, especially when <em>low vibration levels<\/em>, reduced emissions, and selectivity are required. In deconstruction and rock engineering, removal strategies are aligned with structural behavior, transport logistics, and downstream recycling to achieve reliable, replicable results.<\/p>\n<h2>Definition: What is meant by removal?<\/h2>\n<p>Removal is the controlled elimination of material using mechanical, hydraulic, or cutting methods. The goal is to reduce volume, separate components, or decouple load paths. In <strong>concrete demolition<\/strong>, removal includes fragmenting concrete, exposing and cutting <strong>reinforcing steel<\/strong>, and producing defined fracture faces. In rock mechanics, removal refers to dislodging blocks or slabs along natural or induced weakness planes. Key indicators include removal performance (e.g., m\u00b3\/h), removal rate, specific energy demand (e.g., kWh\/m\u00b3), piece-size distribution, and emissions (noise, dust, vibrations). Additional quality criteria include <em>repeatability<\/em>, tool utilization, downtime, and the degree of material separation for recycling.<\/p>\n<h2>Overview of removal methods<\/h2>\n<p>The choice of removal method depends on the material, component geometry, reinforcement level, accessibility, environmental constraints, and the objective of deconstruction. Mechanical-hydraulic methods enable precise, selective, and often low-vibration interventions. In practice, methods are frequently combined to balance crack control, speed, and separation quality.<\/p>\n<ul>\n<li><strong>Splitting (hydraulic)<\/strong>: <em>hydraulic wedge splitters<\/em> and rock splitting cylinders generate high, localized tensile stresses via wedge or cylinder systems. Typical for <strong>rock excavation<\/strong> and <strong>tunnel construction<\/strong>, but also for massive <strong>concrete foundation<\/strong> elements when a low-vibration solution is required. Advantages include minimal peripheral damage, controllable crack paths, and low noise levels compared with impact methods.<\/li>\n<li><strong>Crushing\/pressing<\/strong>: <em>concrete pulverizers<\/em> grip and break concrete through high closing forces. Ideal for selective deconstruction, building gutting, <strong>ceiling demolition<\/strong> and <strong>wall demolition<\/strong>, as well as exposing reinforcement. Bite geometry and jaw speed influence piece-size control and steel exposure length.<\/li>\n<li><strong>Cutting\/separating<\/strong>: <em>steel shear<\/em>, <em>combination shears<\/em>, and <em>Multi Cutters<\/em> separate sections, reinforcement, and mixed materials. <em>cutting torch<\/em> units are suitable for special tasks on tanks and plate material. Cutting is often used to define edges, create reliefs, or remove embedded items with precision.<\/li>\n<li><strong>Combined methods<\/strong>: Splitting to initiate cracks and reduce volume, followed by pulverizer or shear work to optimize piece size and separate steel. This sequence improves selectivity and reduces unintended loads on adjacent structures.<\/li>\n<\/ul>\n<h2>Removal in concrete demolition and special deconstruction<\/h2>\n<p>In the removal of concrete components today, selectivity is combined with safety and efficiency. Material removal is planned; components are fragmented to facilitate transport, recycling, and the separation of material streams. Interfaces with temporary supports, lifting gear, and <em>load path management<\/em> are defined in advance to avoid unplanned load redistribution.<\/p>\n<h3>Selective crushing with concrete pulverizers<\/h3>\n<p><strong>concrete pulverizers<\/strong> act by peeling and pressing. They enable controlled fractures, minimize secondary damage, and expose reinforcement. This improves material separation and simplifies the disposal chain. Further benefits include reduced rework on adjacent surfaces, improved bite-to-bite repeatability, and greater predictability of piece weights for safe handling.<\/p>\n<h3>Low-vibration removal with rock and concrete splitters<\/h3>\n<p>With <strong>hydraulic wedge splitters<\/strong>, stresses are introduced in a targeted manner along borehole axes. This method is suitable for massive, thick-walled components, bridge foundations, <strong>machine foundation<\/strong> elements, or areas with sensitive surroundings where low vibration and noise levels are required. Purpose-designed <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">rock and concrete splitters<\/a> enable predictable crack propagation with minimal disturbance. Predefined drilling patterns and staged activation permit stepwise release without overloading remaining structures.<\/p>\n<h3>Hydraulic power packs as the energy source<\/h3>\n<p>Hydraulic power packs provide pressure and flow to match demand. A stable hydraulic supply directly influences removal speed, repeatability, and tool preservation. Selecting appropriate <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power units<\/a> supports consistent performance and longevity. Key parameters include sufficient cooling, filtration quality, hose lengths and diameters, and pressure\/flow monitoring to avoid cavitation and thermal stress.<\/p>\n<h2>Rock excavation, tunnel construction and natural stone extraction<\/h2>\n<p>In rock removal, controlled crack guidance is key. Rock splitting cylinders and <strong>hydraulic wedge splitters<\/strong> use drilling patterns to define load paths and release blocks with targeted geometry. This minimizes vibrations, protects surrounding structures, and preserves the desired block size for transport. Where geological variability is high, sequencing and adaptive drilling offsets maintain crack alignment and limit spalling.<\/p>\n<h3>Drilling pattern and crack control<\/h3>\n<p>Borehole diameter, spacing, edge distances, and sequencing determine crack initiation. In practice, work proceeds from the edge toward the center to avoid spalling and guide the fracture front. Additional influencing factors include overburden confinement, discontinuity orientation, and the timing of adjacent activation cycles.<\/p>\n<h2>Building gutting and cutting<\/h2>\n<p>In structural interiors, separation work is often performed under confined conditions. Compact tools are required that can grip precisely, cut, and keep piece weights manageable. Fire load, spark formation, and ventilation must be considered when planning operations with thermal cutting or in areas with combustible materials.<\/p>\n<h3>Shears and cutters in existing structures<\/h3>\n<p><strong>combination shears<\/strong> and <strong>Multi Cutters<\/strong> cover variable material mixes, for example in installations, beams, or reinforcement bundles. <strong>steel shear<\/strong> units are deployed for removing steel sections, beams, and reinforcement bundles. Compact <a href=\"https:\/\/www.darda.de\/en\/product-overview\/steel-shears\">steel shears<\/a> address confined spaces. Cutting edge geometry and jaw alignment influence burr formation, rework needs, and the risk of uncontrolled part release.<\/p>\n<h2>Performance indicators and influencing factors<\/h2>\n<ul>\n<li>Material properties: strength, density, grain structure, moisture, reinforcement ratio.<\/li>\n<li>Geometry: component thickness, edge distances, embedment, support conditions.<\/li>\n<li>Accessibility: working space, lifting gear availability, attachment points, visibility.<\/li>\n<li>Hydraulic parameters: system pressure, flow rate, temperature stability of the <strong>hydraulic power packs<\/strong>.<\/li>\n<li>Tool condition: wear, cutting-edge geometry, tightness, maintenance state.<\/li>\n<li>Environment: vibration and noise limits, dust constraints, neighbor protection.<\/li>\n<li>Process organization: takt planning, piece-size strategy, logistics and <strong>haulage logistics<\/strong>.<\/li>\n<li>Human factors: operator skill, communication, and shift handover quality.<\/li>\n<li>Cycle strategy: tool change frequency, bite pattern, and idle time share.<\/li>\n<\/ul>\n<h2>Planning, safety and emission control<\/h2>\n<p>Every removal process starts with investigation and planning: material analysis, utilities and embedded items, load-bearing behavior, load redistribution, and protection zones. Safety concepts account for fall hazards, crushing, cutting, hydraulic pressure, and the controlled removal of load paths. Emissions are reduced by water misting, extraction, enclosures, and low-vibration methods. Depending on the project, regulatory requirements, evidence, and monitoring measures may be necessary and should be integrated early. Method statements, risk assessments, and contingency plans form the basis for controlled execution and documentation.<\/p>\n<h2>Process chain: From positioning to haulage logistics<\/h2>\n<ol>\n<li>Survey and clearance measurement; define removal objectives and limits.<\/li>\n<li>Select the method: splitting, pulverizer work, shears, or combined sequences.<\/li>\n<li>Set-up: laydown areas, <strong>hydraulic power packs<\/strong>, hose routing, protection zones.<\/li>\n<li>Preparation: drilling pattern for splitters or pilot cuts\/setting points for pulverizers.<\/li>\n<li>Primary removal: splitting cycles or pulverizer cycles for volume reduction.<\/li>\n<li>Secondary removal: re-breaking, piece-size optimization, stripping steel from concrete.<\/li>\n<li>Steel separation: <strong>steel shear<\/strong>, <strong>attachment shear<\/strong> or <strong>Multi Cutters<\/strong>.<\/li>\n<li>Sorting and <strong>haulage logistics<\/strong>: separate material streams for recycling and disposal.<\/li>\n<li>Inspection: visual checks, dimensional control, documentation of emissions.<\/li>\n<li>Handover: clear work area, finalize records, and confirm compliance with limits.<\/li>\n<\/ol>\n<h2>Quality assurance and documentation<\/h2>\n<p>Quality in removal is reflected in reproducible fracture patterns, adherence to tolerances, limited emissions, and cleanly separated materials. Documentation includes target\/actual comparisons, measurements from vibration or noise monitoring, photo records, material certificates, and maintenance status of the tools used. Acceptance criteria are defined beforehand and verified at milestones to ensure consistency across shifts and changing site conditions.<\/p>\n<h2>Practice-oriented scenarios<\/h2>\n<h3>Foundation removal in sensitive surroundings<\/h3>\n<p>Massive foundations are released into blocks with <strong>hydraulic wedge splitters<\/strong> and then downsized with <strong>concrete pulverizers<\/strong>. The low-emission sequence protects adjacent components. Preplanning of lifting points and transport paths shortens cycle times and reduces handling risks.<\/p>\n<h3>Ceiling demolition in existing structures<\/h3>\n<p>Segmented crushing with <strong>concrete pulverizers<\/strong>, removal of edge strips, and controlled setting down of the segments. Reinforcement is cut with <strong>steel shear<\/strong>. Dust suppression by misting and consistent piece-size strategy ensure predictable loads for lifting gear and minimize rework.<\/p>\n<h3>Rock breakout in tunnel heading<\/h3>\n<p>Set the drilling pattern, perform splitting cycles with rock splitting cylinders, release and load the blocks. Benefit: targeted crack control with low vibrations. Staggered activation and adherence to edge distances prevent uncontrolled spalling and maintain profile geometry.<\/p>\n<h2>Tool selection by material and objective<\/h2>\n<ul>\n<li><strong>concrete pulverizers<\/strong>: fragmenting concrete components, exposing reinforcement, selective deconstruction.<\/li>\n<li><strong>hydraulic wedge splitters<\/strong> incl. rock splitting cylinders: low-vibration release of massive concrete and rock bodies.<\/li>\n<li><strong>steel shear<\/strong>: cutting sections, reinforcement, and steel beams.<\/li>\n<li><strong>combination shears<\/strong> and <strong>Multi Cutters<\/strong>: flexible separation tasks with mixed materials.<\/li>\n<li><strong>cutting torch<\/strong>: special tasks on tanks, plates, and sheet metal.<\/li>\n<li><strong>hydraulic power packs<\/strong>: tool- and demand-appropriate supply of pressure and flow.<\/li>\n<\/ul>\n<h2>Tips for efficient, material-friendly removal<\/h2>\n<ul>\n<li>Define the removal target precisely: piece sizes, separation joints, residual load-bearing capacity.<\/li>\n<li>Combine splitting and pulverizer work to minimize forces.<\/li>\n<li>Adapt drilling patterns to component thickness, reinforcement, and edge distances.<\/li>\n<li>Warm up the hydraulic system; match pressure\/flow to tool demand.<\/li>\n<li>Inspect tools regularly; address wear early.<\/li>\n<li>Integrate dust and noise protection; isolate working areas.<\/li>\n<li>Design lifting gear and logistics for planned piece weights.<\/li>\n<li>Continuously check and document readings (vibration, noise).<\/li>\n<li>Use mock-ups or trial areas to calibrate bite sizes and cycle times before full-scale work.<\/li>\n<li>Plan relief measures and temporary supports to maintain defined load paths throughout the process.<\/li>\n<\/ul>\n<h2>Limits and alternatives in removal<\/h2>\n<p>With very high reinforcement ratios, prestressing elements, or highly heterogeneous composites, crack control can be challenging. In such cases, the process is often broken down into smaller steps: preparatory <strong>relief cut<\/strong>s, local splitting, then pulverizer or shear work. Where necessary, cutting methods are added to define edges or separate embedded items. The decisive factor is a combination of methods that equally considers structural analysis, safety, emissions, and scheduling. Where boundary conditions change during execution, method statements should be updated and verified before continuation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Removal denotes the targeted elimination of material from structures or natural rock bodies. In practice, the spectrum ranges from the controlled concrete deconstruction of elements to steel cutting and the splitting of rock. Decisive factors are precise force application, the desired crack propagation, and a predictable outcome with respect to <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/removal\">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":""},"class_list":["post-18916","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Removal in Concrete Demolition &amp; Rock Excavation<\/title>\n<meta name=\"description\" content=\"Expert guide to Removal in demolition &amp; rock excavation - controlled methods, low vibration \u2713 precise splitting.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.darda.de\/en\/knowledge\/removal\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Removal in Concrete Demolition &amp; Rock Excavation\" \/>\n<meta property=\"og:description\" content=\"Expert guide to Removal in demolition &amp; rock excavation - 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