{"id":20213,"date":"2026-01-31T08:48:23","date_gmt":"2026-01-31T07:48:23","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20213"},"modified":"2026-01-31T08:48:23","modified_gmt":"2026-01-31T07:48:23","slug":"blasting","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/blasting","title":{"rendered":"Blasting"},"content":{"rendered":"
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Blasting describes the targeted fracturing of solid material such as concrete, reinforced concrete, or rock by the controlled introduction of energy, in order to convert components, structures, or rock masses into pieces suitable for transport and further processing. In practice, the spectrum ranges from explosive techniques to non-explosive, hydraulic solutions. In concrete demolition, special demolition, rock excavation, tunnel construction, and natural stone extraction, blasting and blasting-related methods are used in combination. Depending on objectives and surroundings, devices such as concrete pulverizers<\/strong> or rock and concrete splitters<\/a> are employed at different process stages.<\/p>\n

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

Blasting is understood as the controlled disassembly of massive material by the sudden release of stresses along artificially created zones of weakness. This can be carried out using explosive techniques (for example with explosive charges) or in a non-explosive manner, such as by hydraulic splitting. The goal is defined fragmentation that takes into account geometric specifications, vibration and emission limits, as well as structural and safety boundary conditions. Blasting serves to loosen, separate, pre-break, or deliberately reduce component thicknesses and volumes, often as a preparatory step for mechanical follow-up processing.<\/p>\n

Methods and operating principles of blasting<\/h2>\n

Blasting is based on generating and directing tensile stresses that load the material beyond its strength along desired separation planes. The selection and design of the method depend on material properties (strength, matrix, reinforcement), environmental constraints (vibration, noise, dust), and logistical objectives.<\/p>\n

Explosive blasting<\/h3>\n

With explosive techniques, energy is released in a very short time to initiate cracking and fragmentation. The effect can be controlled via drilling pattern, charge arrangement, delay, and shielding. In urban areas and sensitive structures, vibration and emission limits take priority; often the volume is reduced first or components are shielded so that the effects of shock and pressure waves remain controlled.<\/p>\n

Hydraulic splitting as a non-explosive alternative<\/h3>\n

In hydraulic splitting, rock and concrete splitters<\/strong> as well as rock splitting cylinders<\/strong> generate controlled tensile stresses in the borehole via wedge- or cylinder-shaped pressure bodies. The material breaks along defined axes, fragment size is highly controllable, and vibrations and airborne sound remain very low. This method is particularly proven in inner-city concrete demolition and special demolition<\/em>, during strip-out works, and in rock excavation and tunnel construction<\/em> when regulations constrain explosive methods.<\/p>\n

Combined methods<\/h3>\n

In practice, methods are combined: pre-drilling and splitting reduce cross-sections and stress states, after which concrete pulverizers<\/strong>, combination shears<\/em> or multi cutters<\/em> undertake structured disassembly. In this way, vibration, dust, and back-effects on adjacent structures can be minimized while optimizing logistics for removal.<\/p>\n

Fields of application and typical objectives<\/h2>\n

Depending on the area of use, target geometries, environmental constraints, and equipment differ:<\/p>\n

Concrete demolition and special demolition<\/h3>\n

Massive foundations, bridges, or bunker structures are often reduced volumetrically first. Concrete pulverizers<\/strong> separate reinforcement and concrete in the course of dismantling, while rock and concrete splitters<\/strong> pre-break components along defined lines. This facilitates low-dust, low-vibration step-by-step dismantling.<\/p>\n

Strip-out and cutting<\/h3>\n

In buildings with confined space conditions, non-explosive methods are essential. Hydraulic splitting systems create separation joints before multi cutters<\/em> or combination shears<\/em> process lines, beams, and mixed constructions. Controlled removal supports clean material separation for recycling.<\/p>\n

Rock excavation and tunnel construction<\/h3>\n

In rock, pre-fragmentation facilitates extraction or profiling: splitting cylinders establish defined separation planes, blasting or mechanical processing then handles removal. In sensitive areas, for example near existing structures, non-explosive methods are used to meet vibration limits.<\/p>\n

Natural stone extraction<\/h3>\n

Controlled crack guidance is crucial for block quality and yield. Hydraulic splitting produces smooth separation faces; subsequent work with steel shears<\/em> or multi cutters<\/em> squares edges and reduces blocks to transport size.<\/p>\n

Special applications<\/h3>\n

In facilities with elevated safety requirements or in potentially explosive environments, non-explosive solutions are preferred. Tank cutters<\/em> and shear-based systems complement controlled pre-breaking without introducing ignition sources.<\/p>\n

Equipment and tools around blasting<\/h2>\n

Equipment selection follows the material, accessibility, and emission requirements. Hydraulics provide the energy in many projects; hydraulic power units<\/a> feed the end tools and enable modular setups.<\/p>\n

Rock and concrete splitters<\/h3>\n

Splitters and rock splitting cylinders<\/strong> work gently on the material and generate defined cracks with high repeatability. Typical tasks include pre-breaking foundations, loosening rock in excavation pits, and creating separation joints in deconstruction.<\/p>\n

Concrete pulverizers<\/h3>\n

Concrete pulverizers<\/strong> combine crushing and cutting action: concrete is crushed, reinforcement is separated. In combination with pre-drilled and tensioned separation planes, they accelerate removal without generating high vibrations.<\/p>\n

Combination shears and multi cutters<\/h3>\n

These tools cover different material types, such as mixed constructions of concrete, masonry, and steel. They are positioned in the follow-up process to blasting or pre-breaking and support structured dismantling.<\/p>\n

Steel shears and tank cutters<\/h3>\n

Steel shears<\/em> cut profiles, beams, and reinforcement. Tank cutters<\/em> are used where thermal cutting methods are not permitted due to fire and explosion protection.<\/p>\n

Planning, safety, and regulatory framework<\/h2>\n

Blasting and blasting-related methods require careful planning. The protection of people, adjacent buildings, and the environment takes top priority. Depending on the method, qualifications and permits are necessary; compliance with applicable legal requirements lies with those executing the work.<\/p>\n

Essential planning steps<\/h3>\n