A pneumatic hammer is an impact tool driven by compressed air, used for breaking concrete, rock, asphalt, or masonry, and for soil or material compaction. It operates as a handheld tool for manual demolition work or as an attachment mounted on the boom of an excavator or carrier via a bracket or quick coupler.
Operating Principle
Compressed air supplied through a hose drives a piston inside a cylinder. A valve system alternately admits air above and below the piston, producing a reciprocating motion. The piston strikes a tool bit (moil point, chisel, or flat tool) that transmits the impact energy into the material. Handheld units are typically supplied by a separate air compressor; excavator-mounted pneumatic breakers receive air from an onboard or towed compressor unit rather than the machine's hydraulic circuit.
Design and Components
Main components include the cylinder housing, piston, valve chest, tool retainer (chuck), and the air inlet connection, usually a quick-release coupling. Handheld models feature side handles with vibration-damping elements and a throttle lever (dead-man control) that stops air supply when released. Mounted versions use a steel housing with a mounting bracket compatible with the carrier's attachment interface.
Technical Parameters
Typical operating pressure for handheld pneumatic hammers is around 6 bar. Air consumption commonly ranges from 1.0 to 2.5 m³/min depending on tool size and impact energy class. Impact rates for handheld breakers typically fall between 900 and 1,600 blows per minute (bpm), with single-blow energy ranging from roughly 20 J for light-duty tools up to 60 J or more for heavy-duty units. Weight of handheld pneumatic hammers ranges from approximately 8 kg for light chipping tools to over 30 kg for heavy breaking tools. Hose diameter and length affect pressure drop and must match the required air flow to maintain rated performance at the tool.
Applications
Handheld pneumatic hammers are used for concrete demolition, asphalt breaking, trenching in hard ground, removing tile or screed, and chiseling work in confined spaces. Excavator-mounted pneumatic breakers are applied in quarrying, trenching, and demolition where compressed-air infrastructure is already available on site, such as tunneling or mining operations. Compaction variants with flat tamping plates are used for backfill compaction in trenches and around foundations.
Standards and Regulations
Handheld pneumatic percussive tools fall under the safety requirements of ISO 11148-4, which addresses design, vibration, and noise emission testing for non-rotary percussive hand tools. Vibration exposure during use is subject to assessment under the EU Physical Agents (Vibration) Directive 2002/44/EC, which sets exposure action and limit values relevant for occupational health planning on construction sites. Noise emission values are typically declared by the tool in accordance with applicable machinery noise test codes and must be considered for workplace noise exposure assessments under local occupational safety regulations.
Selection Criteria
Selection depends on matching air consumption of the tool to the delivery capacity of the available compressor, expressed in m³/min at the required operating pressure. Impact energy and blow rate should correspond to the hardness and thickness of the material to be broken. For handheld tools, weight and vibration level affect operator fatigue and compliance with daily vibration exposure limits. For excavator-mounted units, the mounting interface and hose routing must be compatible with the carrier's boom and air supply configuration.