The safety inspection of hydraulically operated cutting and splitting tools protects people, equipment, and the environment in demanding operations such as concrete demolition and special deconstruction, rock excavation, tunnel construction, interior demolition, and cutting. It systematically assesses the safe condition of concrete pulverizers, rock and concrete splitting equipment, hydraulic power packs, combination shears, multi cutters, steel shears, rock wedge splitters, and tank cutters. For Darda GmbH and its users, a carefully planned, documented, and recurring inspection is essential to minimize risks, prevent downtime, and ensure functional safety throughout the entire life cycle.
Definition: What is meant by a safety inspection
A safety inspection is the scheduled, documented verification of a work equipment’s safe condition. It usually includes a visual inspection, a functional test, and—depending on the product group—measurement-based or pressure-related tests. The goal is to determine whether the device can be operated safely, whether deviations are present, and which measures (repair, replacement, decommissioning) are required. A safety inspection is not a one-time event but part of a continuous process involving hazard analysis, inspection, care, and maintenance.
Practical sequence of the safety inspection
The sequence starts with work preparation: review documents (operating manual, latest inspection reports), assess hazards, cordon off the area, secure energy sources, clean the device. This is followed by the visual inspection for damage, cracks, leaks, and missing protective or marking parts. Next is the functional test in a depressurized state and at operating pressure: valves, actuators, emergency stop or dead-man control, directions of movement, end positions, holding functions. Depending on the device type, a pressure- or load-related test follows, such as achieving the target operating pressure at the hydraulic power pack or the uniform opening and closing of the concrete pulverizer under load. Finally, the results are documented in a traceable manner, identified defects are evaluated, and measures are defined. Before every commissioning after repair, after exceptional events, and at defined intervals this sequence must be followed.
Types of inspections and intervals
A distinction is made between initial inspection before commissioning, recurring inspections at defined intervals, and event-driven inspections after repair, overload, impact, or unusual incidents. Intervals depend on stress, operating conditions, manufacturer specifications, and internal requirements. In dusty environments or with frequent transport, shorter intervals may be advisable. Inspections should be carried out by a competent, qualified person; daily visual checks by operating personnel complement this rhythm. Legal and occupational safety requirements can vary by country and site and must be considered in planning.
Scope of inspection by product groups
Concrete pulverizers
For concrete pulverizers, cutting and crushing forces, moving jaws, and hydraulics are in focus. Important checkpoints are the condition of cutting edges and crushing jaws, wear on pins, bushings, and bearing points, cracks in the frame, correct seating of protective plates, proper function of check valves, cylinder leak-tightness, uniform opening and closing movement, and stability under load. Watch for atypical noises, jaw misalignment, or noticeable heating. Damaged blades or elongated bolts cause uncontrolled forces and must be replaced. Markings such as load-bearing capacity, operating pressure, and serial number must be legible.
Rock and concrete splitting equipment
Rock and concrete splitting equipment as well as rock wedge splitters operate with high splitting forces introduced into the material via boreholes. The safety inspection includes checking the splitting cylinders for cracks, burr formation, and surface damage; inspecting wedges, springs, and tie rods; leak-tightness of connections, couplings, and hydraulic hose lines; the condition of kink protection and abrasion protection; and the correct pressure setting on the hydraulic power pack. The retraction of the splitting mechanism must be complete and uniform. Borehole diameter, depth, and axial alignment must be checked before use to prevent transverse loads. Spall protection and a clearly defined safety distance must be provided because flying fragments can occur.
Hydraulic power packs
Hydraulic power packs supply the attachments with energy. Check oil level and oil quality, system leak-tightness, filter condition, function and return forces of controls, readability of the pressure gauge, pressure limiting, emergency stop, and protective devices. Vibration and noise behavior provide clues to cavitation or bearing damage. The permissible operating pressure must be reached reproducibly; a deviating pressure curve indicates wear or misadjustment. Hose assemblies must be checked for aging, abrasion marks, and coupling locks. Electrical equipment and fuel systems (if present) must be verified for safe function.
Combination shears, multi cutters, and steel shears
For these tools, the focus is on the integrity of the cutting edges, straight guidance, the condition of the rotary feedthrough (if present), and holding and end-position safety. Irregular cut surfaces, burr formation, or material breakouts on the blades indicate overload or material fatigue. The safety inspection verifies that the shear holds closed under the maximum permissible load, valves seal tightly, and no creeping pressure drop occurs.
Tank cutters
Tank cutters require a particularly thorough safety inspection, as residual media, vapors, or thin-walled areas may create additional hazards. Before use, clearance measurement, cleaning, and suitability of the method must be ensured. The device itself is inspected with regard to cutting head, drive unit, hydraulics, and protection systems; the control must respond precisely, and cooling and flushing functions (if present) must operate reliably. The rule is: Work only in approved areas and with suitable safety equipment.
Safety in operation: typical application areas
Concrete demolition and special demolition
Demolition projects involve variable loads, vibration, and abrasion. Safety inspections pay particular attention to structural integrity, holding devices, valves, and hoses. Concrete pulverizers must grip components securely and separate them in a controlled manner; rock and concrete splitting equipment must not cause uncontrolled cracks that could bring components down. The work area must be cleared, and falling parts must be anticipated.
Interior demolition and cutting
Indoors, dust, noise, utility lines, and confined spaces are additional factors. Functional emergency stop devices, intact hose protection, and reliable pressure control are mandatory. Hydraulic power packs require sufficient fresh air supply; leaking oil must be removed immediately. Tools with switching functions (cutting/pressing) must be clearly identifiable and safe to operate.
Rock excavation and tunnel construction
In tunnel construction, risks are amplified by limited escape routes, rock pressure, and moisture. Rock wedge splitters must be checked for corrosion, leak-tightness, and reproducible splitting performance. The splitting sequence must be adapted to the geology; uncontrolled detachments must be avoided. Lighting and communication are part of the safety organization and are included in inspection planning.
Natural stone extraction
In natural stone extraction, the quality of the boreholes determines safety: correct diameters, perpendicular alignment, sufficient edge distance. The safety inspection of rock and concrete splitting equipment ensures that splitting forces remain within the specified range and that retraction occurs even when contaminated. Visibly damaged wedges or splitting elements must be replaced immediately.
Special applications
Special applications involve atypical materials, extremely low or high temperatures, or particular cleanliness requirements. The safety inspection assesses the suitability of seals, hose lines, and oils for the operating conditions, the function of protection systems, and the readability of markings. Additional protective measures must be defined where appropriate.
Documentation, marking, and traceability
Traceable documentation increases legal certainty and technical availability. The inspection report includes device data (manufacturer, serial number, year of manufacture), date, scope and result of the inspection, identified defects, measures, deadlines, and the identity of the inspecting person. On the device itself, the next inspection date, permissible operating pressure, and essential operating limits should be clearly legible. Without complete documentation, a safety inspection is considered incomplete.
Qualifications, test equipment, and preparation
Inspectors need sound knowledge of hydraulics, the respective product groups, and the relevant regulations. Required test equipment must be available in functional, calibrated condition, such as pressure gauges for operating pressure, measuring tools for wear dimensions, or suitable leak-testing media. Inspection preparation includes cleaning, securing against unintended movement, setting up a cordoned-off area, and providing safety equipment.
Typical defect patterns and measures
Common findings include leaks at hose and screw connections, crimped or aged hoses, worn bearing points, loosened bolts, hairline cracks in highly stressed frame areas, uneven jaw movements, or a sluggish hydraulic power pack. Measures range from retightening specified connections to replacing worn components and decommissioning. For safety-relevant defects, operation must be stopped immediately until the cause has been remedied and a new safety inspection has been carried out.
Specifics for concrete pulverizers and rock and concrete splitting equipment
Concrete pulverizers are predestined for separating reinforced components. The safety inspection focuses on the harmonious interaction of blades, cylinder, and frame. One-sided wear or play in the bearings leads to misalignment and an increased risk of component detachment. Rock and concrete splitting equipment acts deep in the material: inspection planning additionally includes assessing borehole quality, splitting sequence, and the extent of the safety distance. Both device types benefit from close-knit visual checks in shift operation, as small changes (such as oil mist at the seal, fine burr formation on wedges) can provide early indications of larger problems.
Integration into maintenance and hazard analysis
An effective safety inspection is closely interlinked with maintenance. Condition data from inspections feed into maintenance planning, wear limits are aligned with field data, and spare parts are scheduled in time. The operation’s hazard analysis considers inspection intervals, staff qualifications, and the requirements of each deployment site. This creates a robust system that supports safety, availability, and quality in equal measure.