{"id":19001,"date":"2025-10-20T08:37:27","date_gmt":"2025-10-20T06:37:27","guid":{"rendered":"https:\/\/www.darda.de\/borehole-drilling"},"modified":"2026-03-28T15:37:03","modified_gmt":"2026-03-28T14:37:03","slug":"borehole-drilling","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/borehole-drilling","title":{"rendered":"Borehole drilling"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Borehole drilling is a central foundational topic in concrete demolition, special demolition as well as in rock excavation and tunnel construction. It defines how precisely, safely, and in a controlled manner subsequent work steps can be carried out &#8211; from hydraulic splitting to targeted removal with concrete demolition shears. Properly planned and executed boreholes guide cracks, reduce cross-sections, enable anchor points, starter openings, or wire pass-throughs, and create the basis for reliable results with the tools from Darda GmbH. As an upstream process, it determines productivity, manageability of vibrations and noise, and the overall controllability of the deconstruction sequence.<\/p>\n<h2>Definition: What is meant by borehole drilling?<\/h2>\n<p>Borehole drilling refers to creating cylindrical cavities in concrete, reinforced concrete, masonry, or rock with a specified diameter, path, and depth. It serves as an <em>upstream process<\/em> to support subsequent methods such as hydraulic splitting, controlled removal with concrete demolition shears, anchor installations, wire and saw cuts, or measures for gutting and cutting. Key parameters are borehole diameter, borehole depth, drilling angle, grid pattern, and edge distances. The quality of the boreholes has a decisive influence on the splitting effect, crack guidance, force transmission from cylinders, and the efficiency and safety of the deconstruction. Positional accuracy, tolerance compliance, and a clean hole surface are integral to the definition and determine the reliability of subsequent operations.<\/p>\n<h2>Methods and equipment for borehole drilling<\/h2>\n<p>In practice, rotary, percussive, and diamond-supported methods are used. For concrete and rock, <strong>rotary hammer drilling<\/strong> (e.g., with SDS or hex shanks), pure rotary drilling, and <strong>core drilling<\/strong> with diamond-tipped core bits are predominant. In rock extraction and tunnel construction, high-frequency or down-the-hole methods are also common. Depending on the task, handheld hammer drills, drill stands with vacuum or dowel fastening, as well as drill carriages are used. The power supply can be electric, pneumatic, or hydraulic. For hydraulic splitting &#8211; for example with rock split cylinders and rock and concrete splitters &#8211; <em>clean, true-to-size boreholes<\/em> are crucial so that wedges and counter-wedges can operate safely and form-fit.<\/p>\n<ul>\n<li><strong>Rotary hammer drilling<\/strong>: productive for pattern drilling and roughening, suitable for reinforced zones with appropriate bits.<\/li>\n<li><strong>Core drilling<\/strong>: precise diameters with low breakout, ideal for starter openings, penetrations, and relief holes.<\/li>\n<li><strong>Pure rotary drilling<\/strong>: suitable for brittle natural stone and masonry where percussive energy could cause unintended spalling.<\/li>\n<\/ul>\n<h3>Borehole diameter and depth<\/h3>\n<p>The diameter is determined by the tool used and the desired effect. For hydraulic split cylinders, borehole diameters of a few centimeters are typically used; the depth is based on cylinder stroke and the component thickness. In core drilling, diameters from a few millimeters up to large-format openings are realized, for example for service penetrations, wire saws, or relief openings. Sufficient edge distances are important to avoid uncontrolled spalling, as is a depth that matches the planned force transmission.<\/p>\n<p>In practice, <strong>diameter tolerance<\/strong> and <strong>hole straightness<\/strong> define process quality. Core drilling commonly achieves tight tolerances and low runout, while percussive drilling requires careful feed control to limit ovality. Where splitting forces are introduced, the effective depth should at least match the active wedge length to ensure full force transmission.<\/p>\n<ul>\n<li><em>Rules of thumb<\/em>: depth typically equals 90 to 110 percent of the intended splitting zone; pilot holes can support accuracy in inclined drilling.<\/li>\n<li>For multilayer structures, verify through-penetration and adjust depth to differing strengths to avoid over-penetration in weak layers.<\/li>\n<\/ul>\n<h3>Drilling angle, patterns, and grids<\/h3>\n<p>Straight holes perpendicular to the surface are standard. Inclined holes are used to generate shear edges or to preguide cracks. Drilling patterns can be linear (splitting line), staggered (honeycomb grid), or along edges. For splitting, closer center-to-center spacing produces more uniform crack formation; larger spacing increases the individual breakage of the material but is harder to control. For massive components, multi-row grids may be required.<\/p>\n<ul>\n<li><strong>Linear lines<\/strong>: for defined separation planes and predictable crack propagation.<\/li>\n<li><strong>Staggered grids<\/strong>: for area reduction and preconditioning of massive sections.<\/li>\n<li><strong>Perimeter drilling<\/strong>: to protect edges and facings by guiding fractures inward.<\/li>\n<\/ul>\n<h2>Interfaces to products and application areas<\/h2>\n<p>Borehole drilling links planning and execution across several disciplines:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\"><strong>Rock and concrete splitters<\/strong><\/a> as well as <strong>rock split cylinders<\/strong> require true-to-size boreholes to introduce wedge forces in a controlled manner. Precision in diameter and a clean hole surface minimize slip and increase process reliability.<\/li>\n<li><strong>Concrete demolition shears<\/strong> crush components without boreholes. In thick or tough cross-sections, however, <em>relief boreholes<\/em> support targeted biting, reduce transverse forces, and guide cracks.<\/li>\n<li><strong>Combi shears<\/strong>, <strong>steel shears<\/strong>, and <strong>tank cutters<\/strong> benefit from <em>starter openings<\/em> in plates or from core drilling through multilayer structures. This allows cuts or separations to be initiated in a controlled manner.<\/li>\n<li><strong>Hydraulic power packs<\/strong> supply splitters, concrete demolition shears, and other hydraulic tools. Their performance data must match the drilling strategy so that switching between drilling, splitting, and crushing can take place without idle times.<\/li>\n<li><strong>Multi Cutters<\/strong> cut lines, reinforcement, and secondary components exposed after drilling, especially during gutting and cutting.<\/li>\n<\/ul>\n<p>Interfaces require coordinated sequencing, compatible tolerances, and synchronized logistics so that drilling, splitting, and crushing follow each other without rework or idle time.<\/p>\n<p>Typical application areas are <strong>concrete demolition and special demolition<\/strong> (targeted crack guidance, openings), <strong>gutting and cutting<\/strong> (starter holes, core drilling), <strong>rock excavation and tunnel construction<\/strong> (drilling rows for hydraulic splitting), <strong>natural stone extraction<\/strong> (block release via drilling and splitting technology), as well as <strong>special applications<\/strong> in sensitive zones where low vibration levels are required.<\/p>\n<h2>Workflow: planning, execution, and control<\/h2>\n<ol>\n<li><strong>Survey of the component\/rock:<\/strong> Strength, structure, reinforcement position, stresses, and moisture; for rock: bedding, joints, and strength anisotropy.<\/li>\n<li><strong>Method selection:<\/strong> Rotary hammer drilling for productive hole patterns, core drilling for precise diameters, dry or wet methods depending on dust and water management.<\/li>\n<li><strong>Define the drilling pattern:<\/strong> Diameter, depth, center spacing, edge distances, drilling angle, and sequence of production.<\/li>\n<li><strong>Organize occupational safety:<\/strong> Dust extraction or wet drilling, noise reduction, securing of drill stands, safe support and slip resistance.<\/li>\n<li><strong>Produce the boreholes:<\/strong> Centering, incremental feed, regular tool inspection, and adequate cooling or extraction.<\/li>\n<li><strong>Cleaning and inspection:<\/strong> Blow-out and brush the boreholes, measure diameter and depth, visual inspection of edges.<\/li>\n<li><strong>Documentation:<\/strong> Drilling plan, deviations, photos, release for the subsequent tool (e.g., splitter or concrete demolition shear).<\/li>\n<li><strong>Acceptance criteria:<\/strong> Check hole position and angle against the plan, verify diameter tolerance, and record any reinforcing steel encountered.<\/li>\n<li><strong>Handover to the next operation:<\/strong> Mark ready-for-use holes, secure work area, and coordinate power and water changeover for the following process step.<\/li>\n<\/ol>\n<h2>Technical factors and quality assurance<\/h2>\n<p>The performance of the drilling technique is determined by aggregate size and hardness, reinforcement density, tool wear, contact pressure, rotation\/impact rate, and machine stability. <em>Stable drill stands<\/em>, straight guides, and low runout are key factors for true-to-size results. Borehole cleaning &#8211; blow-out, brushing, possibly flushing &#8211; is not only important for injections but also for the <strong>form-fit force transmission<\/strong> of wedges in split cylinders.<\/p>\n<ul>\n<li><strong>Process KPIs<\/strong>: advance rate, deviation per meter, diameter tolerance, edge breakout rate, and rework quota.<\/li>\n<li><strong>Quality gates<\/strong>: tool inspection before shifts, test holes in comparable material, and recorded in-process measurements.<\/li>\n<\/ul>\n<h3>Edge and center spacing<\/h3>\n<p>Sufficient edge distances reduce breakout and help maintain intended fracture lines. In slender components or near sensitive edges, smaller, more closely spaced holes with moderate splitting energy are often advantageous. In massive cross-sections, greater depths and, if necessary, multi-row drilling patterns are effective to define the splitting zone.<\/p>\n<p>Indicative values can support planning: edge distances are often selected at <strong>\u2265 1.5 to 2.0 times the hole diameter<\/strong> for brittle materials, while center-to-center spacing for splitting lines may range from <strong>8 to 12 times the diameter<\/strong> depending on strength, reinforcement, and desired crack continuity. Project-specific trials remain advisable.<\/p>\n<h2>Borehole drilling in rock excavation and tunnel construction<\/h2>\n<p>In rock works, drilling rows are used to prepare for non-blasting removal. For <strong>natural stone extraction<\/strong>, boreholes are placed along geological discontinuities so that hydraulic split cylinders can gently release blocks. In tunnel headings or support areas, drilling with low vibration levels and subsequent splitting can control crack formation and protect surrounding structures. Aligning hole orientation with bedding, foliation, and joint sets improves predictability and reduces energy input.<\/p>\n<h2>Boreholes as predetermined breaking points in concrete demolition<\/h2>\n<p>Relief or predetermined breaking boreholes reduce local stiffness and guide cracks. This allows a <strong>concrete demolition shear<\/strong> to bite into components more easily and removal proceeds in a more controlled manner. For openings, core drilling serves as start points for wire saws or as penetrations, after which rock and concrete splitters can release the remaining areas. In <strong>gutting and cutting<\/strong>, boreholes support low-vibration separation &#8211; especially in occupied or sensitive buildings.<\/p>\n<ul>\n<li><strong>Typical applications<\/strong>: door and window openings, slab edge separations, joint relief in stiff corners, and preconditioning of thick walls before shearing.<\/li>\n<li><strong>Detailing<\/strong>: small-diameter pilot holes can be added at stress concentrators to steer crack initiation.<\/li>\n<\/ul>\n<h2>Hydraulic power supply and peripherals<\/h2>\n<p><strong>Hydraulic power packs<\/strong> provide the necessary performance for split cylinders, concrete demolition shears, combi shears, steel shears, Multi Cutters, and tank cutters. A matched flow rate and correct pressure ensure consistent tool output. Hose routing, couplings, and protection against contamination are important, as drilling slurry and drilling dust can burden the peripherals.<\/p>\n<ul>\n<li>Ensure adequate oil cooling during continuous drilling-splitting cycles to prevent performance drop.<\/li>\n<li>Use contamination control (filters, protective caps) where slurry and fines are present.<\/li>\n<li>Check quick couplings and pressure settings regularly to avoid cavitation and force loss.<\/li>\n<\/ul>\n<h2>Occupational safety, health, and environmental protection<\/h2>\n<p>Drilling generates noise, dust, vibrations, and &#8211; in wet methods &#8211; drilling slurry. Appropriate protective measures must be selected: extraction or wet drilling, hearing and respiratory protection, low vibration levels, slip-resistant supports, orderly hose and cable routing. For components with media lines or prestress, prior investigation is essential. Legal requirements may vary by project; compliance with relevant standards and permits is always project-specific.<\/p>\n<ul>\n<li>Use certified dust extractors with appropriate filter classes for mineral dust.<\/li>\n<li>Capture and dispose of slurry according to local requirements; avoid uncontrolled discharge.<\/li>\n<li>Manage hand-arm vibration exposure by tool selection, duty cycles, and documented breaks.<\/li>\n<li>Apply lockout-tagging for embedded services; verify with detection before drilling.<\/li>\n<li>Plan noise mitigation with scheduling, enclosures, and tool maintenance to reduce emission levels.<\/li>\n<\/ul>\n<h2>Typical errors and how to avoid them<\/h2>\n<ul>\n<li>Insufficient borehole depth or incorrect diameter &#8211; reduces splitting effect and tool fit accuracy.<\/li>\n<li>Misaligned holes &#8211; lead to offsets, oblique force transmission, and uncontrolled spalling.<\/li>\n<li>Poor borehole cleaning &#8211; reduces frictional engagement and can impair wedge systems.<\/li>\n<li>Edge distances too small or center spacing too large &#8211; promote breakout or irregular crack patterns.<\/li>\n<li>Missing reinforcement locating &#8211; increases tool wear and can affect structural behavior.<\/li>\n<li>Inadequate water management &#8211; causes contamination, slipping hazards, or environmental impacts.<\/li>\n<li>Overheating diamond segments &#8211; leads to glazing and accelerated wear; adapt feed and cooling.<\/li>\n<\/ul>\n<h2>Maintenance and tool care<\/h2>\n<p>Percussion and rotary tools require regular inspection of shanks, lubrication, and seals. Diamond core bits must be checked for segment wear, runout, and bond; for glazing, controlled starting with reduced feed helps. Drill stands are checked for fixation, vacuum tightness, or dowel anchorage. Well-maintained equipment increases dimensional accuracy and service life &#8211; and thereby process quality in splitting or crushing.<\/p>\n<p>Define service intervals based on operating hours and material abrasiveness. Keep spare consumables available to maintain continuity when switching between drilling, splitting, and shearing tasks.<\/p>\n<h2>Documentation and verification<\/h2>\n<p>A documented drilling pattern with depths, diameters, grid, and deviations facilitates release for subsequent trades. Photos, measurement logs, and markings ensure traceability &#8211; an advantage, especially in <strong>special demolition<\/strong> and for <strong>special applications<\/strong> in sensitive environments.<\/p>\n<ul>\n<li>Record positional checks (e.g., offsets, inclination) and measured diameters with the respective tool configuration.<\/li>\n<li>Archive acceptance criteria and release notes for the subsequent operation to enable consistent quality across interfaces.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Borehole drilling is a central foundational topic in concrete demolition, special demolition as well as in rock excavation and tunnel construction. It defines how precisely, safely, and in a controlled manner subsequent work steps can be carried out &#8211; from hydraulic splitting to targeted removal with concrete demolition shears. Properly <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/borehole-drilling\">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-19001","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>Borehole Drilling for Demolition &amp; Rock Excavation<\/title>\n<meta name=\"description\" content=\"Master borehole drilling in concrete &amp; rock demolition and tunneling \u27a4 methods, patterns, safety tips, precise results.\" \/>\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\/borehole-drilling\" 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