{"id":18912,"date":"2025-10-31T16:12:31","date_gmt":"2025-10-31T15:12:31","guid":{"rendered":"https:\/\/www.darda.de\/demolition-tool"},"modified":"2026-03-21T17:22:02","modified_gmt":"2026-03-21T16:22:02","slug":"demolition-tool","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/demolition-tool","title":{"rendered":"Demolition tool"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Demolition tool refers to all hydraulic and mechanical equipment used in the deconstruction of structures, in rock excavation and in tunnel construction to <em>cut, crush or split<\/em> materials. This includes in particular concrete pulverizers, <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">stone and concrete splitters<\/a>, combi shears, multi cutters, steel shears, tank cutters as well as supplementary <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power units<\/a>. In professional use, the precise selection of the tool determines occupational safety, the construction process, emissions, and the quality of the recovered materials. In practice, demolition tools enable selective dismantling with predictable process stability, supporting circular construction and compliance with project-specific environmental limits.<\/p>\n<h2>Definition: What is meant by a demolition tool?<\/h2>\n<p>A demolition tool is a working device that introduces forces in a controlled manner into components or rock to split, cut, or crush them. It is mounted on carrier machines such as excavators, cranes or cutting stands, or operated <strong>handheld<\/strong> (e.g., with compact splitting cylinders). Typical operating principles are hydraulic splitting (stone and concrete splitters, rock splitting cylinders), <em>pressing and breaking<\/em> (concrete pulverizers) and <em>cutting<\/em> (steel shears, combi shears, multi cutters, tank cutters). Hydraulic power packs provide the power supply when no onboard hydraulics are available or when specific pressure or flow characteristics are required; they are commonly driven electrically indoors or by combustion engines outdoors, depending on emission constraints.<\/p>\n<h2>Types and operating principles<\/h2>\n<p>Demolition tools differ by the type of force transmission, the target material, and the intended effect (splitting, cutting, crushing). The most important types are, with a characteristic trade-off between productivity, precision, and emissions:<\/p>\n<h3>Splitting tools for low-vibration demolition<\/h3>\n<ul>\n<li><strong>Stone and concrete splitters<\/strong>: Hydraulically actuated wedge or cylinder systems generate high splitting forces in the borehole. Advantageous for concrete demolition and special demolition in sensitive areas, as they cause <em>low vibration levels and low noise<\/em>. They enable controlled crack guidance along planned drilling patterns with minimal secondary damage.<\/li>\n<li><strong>Rock splitting cylinders<\/strong>: Specially sized for natural rock; ideal for <a href=\"https:\/\/www.darda.de\/en\/applications\/rock-demolition-and-tunnel-construction\">rock demolition and tunnel construction<\/a> as well as in natural stone extraction. They enable controlled separation joints without overbreak and are suitable for confined spaces where blasting is not permissible.<\/li>\n<\/ul>\n<h3>Crushers and shears for concrete and metal<\/h3>\n<ul>\n<li><strong>Concrete pulverizers<\/strong>: Crush and reduce reinforced concrete. The rebar is exposed and can be severed with integrated cutting edges. High productivity in <em>concrete demolition<\/em> and <em>special demolition<\/em>. Rotating variants improve positioning and shorten cycle times on complex geometries.<\/li>\n<li><strong>Combi shears<\/strong>: Universal tools for reducing concrete and cutting sections; useful when the material spectrum changes or for strip-out and cutting of heterogeneous components. Interchangeable jaw sets extend the range of application when frequent changeovers are required.<\/li>\n<li><strong>Multi cutters<\/strong>: Flexible geometries for mixed construction materials (sheet, lines, light reinforcement). Efficient during <em>strip-out<\/em> in buildings when selective deconstruction is required. They reduce spark formation compared to thermal cutting in many thin-walled applications.<\/li>\n<li><strong>Steel shears<\/strong>: Designed for massive steel, sections, beams, and thick-walled members. They cut rebar bundles, beams, and pipelines in industrial demolition work. High jaw tip forces and robust pivot bearings are decisive for durability under peak loads.<\/li>\n<li><strong>Tank cutters<\/strong>: For the safe cutting of vessels, tanks, and pipelines. Used during <em>strip-out and cutting<\/em> as well as in <em>special applications<\/em> when controlled separation cuts on thin- to medium-walled steel vessels are required. Proper preparation of the workpiece surface and safe venting are essential for reproducible cutting behavior.<\/li>\n<\/ul>\n<h3>Hydraulic power packs as the power source<\/h3>\n<p>Hydraulic power packs supply pressure and flow when tools cannot be operated from the excavator hydraulics or when a <strong>special hydraulic characteristic<\/strong> is required (e.g., for compact splitters indoors). Important factors are sufficient oil throughput, stable pressure control, temperature management, and suitable hose lengths for the place of use. Noise emissions and the choice of drive (electric for interior work, combustion engines for outdoor or mobile use) must fit the site conditions and the permissible exposure levels.<\/p>\n<h2>Applications and suitable tools<\/h2>\n<h3>Concrete demolition and special demolition<\/h3>\n<ul>\n<li><strong>Concrete pulverizers<\/strong> for breaking walls, slabs, foundations; exposing and cutting reinforcement.<\/li>\n<li><strong>Stone and concrete splitters<\/strong> for low-vibration deconstruction in vibration-sensitive environments (attachment-free operation possible; low dust with suitable measures).<\/li>\n<li>Combi shears and multi cutters for mixed components and switching between concrete and metal content.<\/li>\n<li><strong>Steel shears<\/strong> where high-strength sections and dense reinforcement cages must be cut with minimal heat input.<\/li>\n<\/ul>\n<h3>Strip-out and cutting<\/h3>\n<ul>\n<li><strong>Multi cutters<\/strong> for lines, sheet, light sections and components with varying material thicknesses.<\/li>\n<li><strong>Tank cutters<\/strong> for vessel walls, shafts and pipes with defined separation cuts.<\/li>\n<li>Combi shears for quick switching between size reduction and cutting.<\/li>\n<li><strong>Steel shears<\/strong> for dismantling frames, platforms, and secondary steel during phased shutdowns.<\/li>\n<\/ul>\n<h3>Rock excavation and tunnel construction<\/h3>\n<ul>\n<li><strong>Rock splitting cylinders<\/strong> and <strong>stone and concrete splitters<\/strong> for controlled, blast-free rock removal, including confined sections.<\/li>\n<li>Concrete pulverizers in tunnel construction for secondary breakouts, conversions, and the removal of concrete linings.<\/li>\n<li>Splitters for portal enlargements and cross-passage insets where overbreak must be minimized.<\/li>\n<\/ul>\n<h3>Natural stone extraction<\/h3>\n<ul>\n<li><strong>Rock splitting cylinders<\/strong> for clean block recovery with minimal cracking.<\/li>\n<li>Stone and concrete splitters for precise splitting sequences along planned borehole rows.<\/li>\n<li>Supplementary use in trimming and sizing to reduce waste and transport volume.<\/li>\n<\/ul>\n<h3>Special applications<\/h3>\n<ul>\n<li><strong>Stone and concrete splitters<\/strong> in heritage projects, hospitals or labs where noise and vibration must be minimized.<\/li>\n<li><strong>Tank cutters<\/strong> for sensitive dismantling of vessels; in practice combined with coordinated protective measures.<\/li>\n<li><strong>Multi cutters<\/strong> for removal of embedded services and sheeted enclosures with limited access.<\/li>\n<\/ul>\n<h2>Choosing the right demolition tool<\/h2>\n<p>Selection follows the material, the environment, and the emission limits at the place of use. Key criteria are:<\/p>\n<ul>\n<li><strong>Material and member thickness<\/strong> (concrete strength, rebar content, rock quality, steel grades).<\/li>\n<li><strong>Carrier machine<\/strong> (weight class, hydraulic drive power, reach, mounting interface).<\/li>\n<li><strong>Tool performance indicators<\/strong>: cutting or splitting force, jaw opening, cycle time, oil flow, operating pressure.<\/li>\n<li><strong>Emission requirements<\/strong>: vibration, noise, dust; splitting technology is usually particularly low in vibration.<\/li>\n<li><strong>Deconstruction objective<\/strong>: selective removal, reuse\/recycling, minimization of secondary breakage.<\/li>\n<li><strong>Access and site constraints<\/strong>: headroom, floor load capacity, exclusion zones, proximity to sensitive equipment.<\/li>\n<li><strong>Energy supply<\/strong>: availability of electric power for interior work or the need for independent power packs outdoors.<\/li>\n<li><strong>Process safety<\/strong>: hot work restrictions, potential atmospheres in vessels and pipelines, and monitoring requirements.<\/li>\n<\/ul>\n<h3>Quick selection checklist<\/h3>\n<ul>\n<li>Match <strong>tool mass<\/strong> and <strong>center of gravity<\/strong> to the carrier to maintain stability at the required reach.<\/li>\n<li>Verify <strong>hydraulic compatibility<\/strong> (pressure, flow, return line backpressure, case drain if required).<\/li>\n<li>Confirm <strong>cutting or splitting geometry<\/strong> fits the member dimensions without excessive pre-work.<\/li>\n<li>Plan <strong>material flow<\/strong> for source separation to avoid rehandling and contamination.<\/li>\n<li>Document <strong>emission controls<\/strong> and protective measures in the method statement.<\/li>\n<\/ul>\n<h2>Technique and workflow<\/h2>\n<h3>Concrete pulverizer in structured deconstruction<\/h3>\n<ol>\n<li>Survey of existing conditions: check structural system, rebar layout, and load paths for temporary states.<\/li>\n<li>Isolation of utilities: lines, cables, systems safely switched off.<\/li>\n<li>Create relief cuts or openings to enable controlled breaking.<\/li>\n<li>Apply the concrete pulverizer, reduce the component step by step; cut rebar with the cutting edges.<\/li>\n<li>Source-separated sorting of the fractions (concrete, steel) for recycling.<\/li>\n<li>Establish and maintain exclusion zones, lifting points, and fall protection for removed elements.<\/li>\n<li>Record quantities and material qualities for traceability and recycling documentation.<\/li>\n<\/ol>\n<h3>Stone and concrete splitter in interior applications<\/h3>\n<ol>\n<li>Plan drilling patterns: adapt hole diameter, depth, and grid to member thickness and the desired fracture line.<\/li>\n<li>Drill and clean the holes and insert the splitter centrally.<\/li>\n<li>Hydraulic pressurization: increase splitting force in a controlled manner until cracks form.<\/li>\n<li>Remove the loosened segments, repeat along the planned line.<\/li>\n<li>Accompany with suitable dust and noise reduction measures.<\/li>\n<li>Monitor vibration at sensitive points where required and adjust the sequence accordingly.<\/li>\n<\/ol>\n<h2>Performance indicators and calculation notes<\/h2>\n<p>For practical work, the following indicators are decisive:<\/p>\n<ul>\n<li><strong>Splitting force<\/strong> in kN: determines the maximum achievable crack propagation; to be considered together with borehole spacing and material strength.<\/li>\n<li><strong>Cutting force<\/strong> in kN: decisive for separating rebar, structural steel sections and sheet.<\/li>\n<li><strong>Oil flow and operating pressure<\/strong>: influence cycle time and sustained force; hydraulic power packs must be sized appropriately.<\/li>\n<li><strong>Opening width\/jaw gape<\/strong>: limits member dimensions that can be gripped without pre-cutting.<\/li>\n<li><strong>Service weight and permissible load<\/strong>: must fit the carrier and the working radius to avoid overloads.<\/li>\n<li><strong>Rotation torque and speed<\/strong> for shears and pulverizers: essential for positioning efficiency and cut initiation.<\/li>\n<li><strong>Thermal management<\/strong>: oil cooling capacity and duty cycle define continuous performance under site conditions.<\/li>\n<\/ul>\n<h2>Emissions, safety and health protection<\/h2>\n<p>Demolition work requires a careful hazard analysis. Principles:<\/p>\n<ul>\n<li>Minimize <strong>vibration<\/strong>: prefer splitting technology when the structure, neighboring buildings or sensitive systems must be protected.<\/li>\n<li>Reduce <strong>noise<\/strong> through tool choice, work sequence and damping.<\/li>\n<li>Limit <strong>dust<\/strong> through extraction, water mist or adapted methods; pay particular attention to concrete with quartz content.<\/li>\n<li>Control <strong>cut and crushing hazards<\/strong> at crushers and shears through safety distances and training.<\/li>\n<li>When working on vessels and pipelines with tank cutters, upstream inspection and safeguarding measures are standard; the specific approach follows applicable rules and is defined project-specifically.<\/li>\n<li>Define <strong>exclusion zones<\/strong>, lifting procedures, and signaling; maintain clear communication with machine operators.<\/li>\n<li>For handheld tools, manage <strong>hand-arm vibration exposure<\/strong> and ergonomics; select low-vibration methods where possible.<\/li>\n<li>Assess <strong>hot work<\/strong> classifications and atmospheric conditions for cutting tasks and document gas-free status where applicable.<\/li>\n<\/ul>\n<h2>Material separation and recycling<\/h2>\n<p><em>Selective deconstruction<\/em> increases the quality of the fractions. Concrete pulverizers support rebar exposure, enabling source-separated concrete and steel. Splitters produce large, low-contaminated concrete pieces or natural stone blocks with defined edges. This improves processing, recycling rate and logistics. High sorting purity reduces downstream processing effort, supports documented recycling quotas and can lower disposal costs.<\/p>\n<h2>Maintenance and operation<\/h2>\n<ul>\n<li><strong>Wear parts<\/strong> such as blades, teeth, and wedges should be inspected and rotated\/replaced in good time.<\/li>\n<li>Hydraulic care: monitor filters, oil condition, tightness and hose protection; operate power packs within the permissible temperature range.<\/li>\n<li>Grease mechanics and pin\/bolt connections regularly and check for play.<\/li>\n<li>Function check of safety and shut-off devices before the start of each shift.<\/li>\n<li>Verify bolt torques, jaw alignment and pivot bearing play at defined intervals; correct leaks immediately.<\/li>\n<li>Check hydraulic settings against the data sheet after hose or component changes; document maintenance actions.<\/li>\n<\/ul>\n<h2>Typical failure patterns and how to avoid them<\/h2>\n<ul>\n<li>Unsuitable tool choice (e.g., shears in heavily reinforced head regions) leads to higher loads; concrete pulverizers or pre-splitting sequences can help.<\/li>\n<li>Excessive borehole spacing during splitting causes uncontrolled crack paths; adapt the grid to member strength.<\/li>\n<li>Insufficient oil flow prolongs cycle times and reduces forces; size hydraulic power packs correctly.<\/li>\n<li>Poor dust control increases health risks and wear; plan suitable mitigation measures.<\/li>\n<li>Operating above permissible oil temperature reduces power and accelerates wear; ensure cooling and appropriate duty cycles.<\/li>\n<li>Improper jaw positioning or cutting at the tip beyond rated capacity causes blade or jaw damage; use the optimum cutting zone.<\/li>\n<\/ul>\n<h2>Planning and documentation<\/h2>\n<p>Thorough planning includes component surveys, method selection, emission concepts, and the <strong>definition of work sequences<\/strong> for each area of application. For concrete demolition and special demolition, combinations of concrete pulverizers and stone and concrete splitters have proven effective to balance structural quality, schedule certainty, and material separation. In natural stone extraction and rock excavation, splitting cylinders allow predictable fracture edges, while in industrial demolition work steel shears, tank cutters and combi shears support the controlled separation of metallic structures. Method statements, permit management, monitoring plans for vibration\/noise\/dust, and documented material flows form the basis for safe execution and verifiable sustainability outcomes.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Demolition tool refers to all hydraulic and mechanical equipment used in the deconstruction of structures, in rock excavation and in tunnel construction to cut, crush or split materials. This includes in particular concrete pulverizers, stone and concrete splitters, combi shears, multi cutters, steel shears, tank cutters as well as supplementary <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/demolition-tool\">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-18912","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>Demolition Tool - Construction Equipment Overview<\/title>\n<meta name=\"description\" content=\"Expert guide \u2713 to demolition tool selection for hydraulic &amp; mechanical cutting, crushing and splitting in demolition.\" \/>\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\/demolition-tool\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Demolition Tool - 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