Crane runway

The crane runway denotes the path of travel along which a crane safely moves its loads-inside halls along a crane runway, outdoors on temporarily prepared travel lanes, or on the rails of a gantry crane. For concrete demolition and special demolition, strip-out and cutting, as well as rock excavation, tunnel construction and natural stone extraction, a load-bearing, well-planned travel path is decisive. It determines how components, after being separated with a concrete pulverizer or released in a controlled manner with rock and concrete splitters, are picked up and transported out of the work area. The operation of hydraulic power units and the handling of steel shears, hydraulic demolition shears, Multi Cutters or tank cutters also benefit from clearly defined, safe crane runways without bottlenecks.

Clear logistics concepts, marked one-way sections and resilient surfaces increase throughput and reduce near-miss incidents along the travel path. Where work areas change frequently, modular, relocatable runway elements and consistent signage support reliable processes.

Definition: What is meant by a crane runway?

A crane runway is the structurally and organizationally defined route along which a crane moves loads. In industrial halls this is typically a crane runway made of runway girders and runway rails on which a bridge or overhead travelling crane operates. On construction sites, the term often refers to the temporarily installed travel path for mobile or crawler cranes, including turning and setup areas. Common to all variants: the runway must safely carry the expected loads (including dynamic components), ensure guidance, provide sufficient clearances, and suit the operational processes-for example, the removal of concrete or rock fragments.

Depending on the application, synonymous terms such as crane track, runway beam or travel path are used. The core functions are:

• Carry and distribute loads from wheels and rails into the supporting structure or subgrade.
• Guide crane movements with alignment that minimizes skew and unwanted torsion.
• Maintain a clearance envelope so loads, rigging and equipment move without conflict.
• Enable safe, efficient flow between workface, interim storage and removal logistics.

Planning and design of the crane runway

The design starts with determining maximum load collectives, the crane’s wheel and axle loads, and additional effects from acceleration, braking, skew travel and wind. In halls, runway girders, bearings and the rail profile govern load-bearing capacity and serviceability (deflections, vibrations). Outdoors, soil parameters, settlements, drainage and the construction of load-bearing travel lanes are in focus. Also decisive are clearances in height and width, curve radii, permissible longitudinal and transverse gradients, and safe end stops with buffers.

• Serviceability criteria: vertical deflection limits, twist between rails, vibration comfort and derailment reserves.
• Geotechnical checks: bearing capacity, deformation, frost action and groundwater effects including drainage routing.
• Interfaces: transitions between temporary and permanent structures, access ramps and crossings to other traffic.
• Protection systems: guard rails where required, stops, buffers and measures against contamination on the rail head.

Load assumptions and load-bearing capacity

Design combines the crane’s self-weight, payload, rigging and any auxiliary devices. Dynamic components from hoisting, trolley travel and crane travel increase the calculated wheel loads. During dismantling with a concrete pulverizer, the weight of individual components varies-therefore load ranges, unfavorable load distributions and side pull are considered. Safety margins are common but remain proportionate. Small deflections of the crane runway are important so the load runs smoothly and no impermissible rail forces arise.

For frequently recurring cycles, fatigue and cumulative effects are assessed. Environmental actions such as wind, temperature and potential impact at end stops are combined with operating loads according to the applicable limit state methods and national regulations.

Subgrade and foundation

Mobile cranes require a uniformly load-bearing surface. Compacted base layers, heavy-duty mats, timber or plastic pads, and local foundations beneath outrigger pads are used. Soft soils are improved or avoided; drainage prevents softening. In quarries and during tunnel construction, upslope areas must be secured, slopes stabilized, and rolling layers avoided. Settlement monitoring during operation protects against uneven loading.

Proof rolling and plate load tests help verify bearing capacity before use. Where needed, geotextiles, geogrids and frost-protection layers increase uniformity. Defined inspection criteria for ruts, pumping and standing water trigger maintenance to keep the runway serviceable.

Rails, girders and guidance

Hall crane runways consist of runway girders with mounted runway rails. Critical are tolerance-compliant alignment (elevation, parallelism, gauge), proper fastening (clamping plates, resilient intermediate layers), and end stops with impact buffers. For outdoor portal or bridge cranes, rail systems with undergrouting, firm substructures and controlled drainage are used. Track guidance must minimize skew travel to preserve the rail head and running wheels.

• Alignment quality: consistent rail elevation and gauge reduce wheel flange contact and wear.
• Fastening condition: correct torque, intact elastic pads and corrosion control prevent rail creep.
• Transition zones: ramps and joints are shaped to avoid shocks and keep wheel loads even.

Use in concrete demolition and special demolition

In selective deconstruction, components are systematically removed after separating, crushing or splitting. The crane runway governs the path from the component to interim storage. If the bond of concrete and reinforcement is first released with a concrete pulverizer, controlled work reduces load peaks on the crane. With rock and concrete splitters, massive blocks can be divided into manageable segments, resulting in lower individual loads on the crane runway-an advantage for load-bearing capacity, vibration behavior and wear.

Anti-sway measures such as tag lines, low acceleration and synchronized motions of hoist and trolley improve control. Signaled communication and predefined handover points keep the travel corridor free at all times.

Work sequence and takt

Takt planning links separating and lifting processes: split, cut, rig, lift, set down. Exclusion zones along the runway remain clear so slewing and trolley travel can occur without conflicts. Load collection points are placed for short, repeatable routes. This protects trolleys, reduces start-ups and supports a steady outflow of material.

• Pre-stage rigging and lifting gear to minimize idle times.
• Use standardized load sizes and containers where feasible to stabilize cycle times.
• Visual management with floor markings supports route discipline and emergency access.

Lifting points and component weight

Defined lifting points, good access at edges and even load distribution prevent side pull. When separating with a concrete pulverizer, it is advisable to define lifting points early and relieve them during cutting. If rock-splitting cylinders are used beforehand, stresses can be relieved-the load hangs more steadily, which benefits the crane runway and the runway mechanics.

Verified working load limits for anchors, slings and shackles, edge protection at sharp corners and redundant rigging for irregular shapes reduce the risk of unplanned load shifts.

Strip-out and cutting in existing buildings

In industrial halls, the existing overhead crane supports strip-out. The crane runway remains the transport axis while power packs, hose bundles and tools such as hydraulic demolition shears, steel shears or tank cutters are moved in takt. Openings, suspended lines and temporary scaffolds must not intrude into the structure gauge clearance. When intervening in the load-bearing structure, runway girders and bearing areas require special protection and regular inspection.

Before cutting, adjacent building services are identified and secured. Edge protection, debris netting and temporary decking keep the clearance envelope free of projections and loose material that could foul the crane travel.

Coordination with hydraulic power packs

Hydraulic power packs are positioned so hose runs remain short and crossings of the crane runway are avoided. Crossing bridges or clearly visible hose routing reduce tripping and crushing hazards. Power and media supplies are protected against mechanical impacts during crane operation.

• Color coding and clear labeling of hoses and couplings prevent misconnections.
• Rated pressure checks and regular leak inspections reduce contamination on and beside the runway.
• Shut-off devices and emergency stops remain accessible outside of crane travel paths.

Crane runway in rock excavation and tunnel construction

During tunnel heading or at the portal, rail or gantry cranes are used for material transport. The crane runway must follow the tunnel cross-section, allow sufficient lighting and ventilation, and be protected against dripping water and contamination. Rock blocks released with splitting cylinders are limited to a defined mass to keep the crane’s wheel loads and the stress on the rails low. Steel shears or Multi Cutters are used for dismantling steel arches or fittings; removal proceeds over a clear, slip-resistant crane runway.

Fine material on rail heads, insufficient drainage and poor visibility are typical causes of degraded operation underground. Regular cleaning, protected cable routing and refuges along the route improve resilience and emergency accessibility.

Natural stone extraction and special deployments

In natural stone extraction, gantry cranes travel along block yards. The crane runway must withstand weather; drainage and rail cleanliness are essential. Controlled splitting with rock and concrete splitters produces regularly shaped blocks-this improves rigging and reduces sway during travel. In inner-city special deployments, tight clearances, noise limits and adjacent buildings constrain the runway. A clear route, small load steps and redundant safeguards are then the means of choice.

Seasonal effects such as thermal expansion, icing and vegetation growth are addressed by suitable joints, de-icing strategies and regular clearance of the travel path. Corrosion protection of fastenings and rails extends service life in coastal or industrial atmospheres.

Operation, inspection and safety

Safe operation relies on clear responsibilities, regular visual and functional checks, and documented maintenance. Rails are cleaned, fastenings retightened, end stops checked. Load indicators, warning signals and intact buffers reduce risks. Work under suspended loads is to be avoided organizationally. Hazard analysis and appropriate protective measures follow generally accepted technical rules and applicable regulations; they do not replace case-by-case assessment and are not binding.

• Clarify load-bearing capacities: ground, girders, rails, supports.
• Define load collectives: payloads, dynamic components, unfavorable distributions.
• Set structure gauge clearances: height, width, curves, end stops.
• Plan route guidance: exclusion zones, crossings, sight lines, emergency routes.
• Coordinate interaction with equipment: concrete pulverizer, rock and concrete splitters, hydraulic power pack.
• Provide temporary measures: mats, plates, drainage, lighting.
• Organize operations: takt, lifting gear, signalers, communication paths.
• Document checks: settlements, wear, fastenings, safety devices.

Typical routines include pre-use walkdowns, periodic torque checks on rail fastenings, verification of buffers and end stops, and scheduled measurements of alignment and gauge. Findings are logged promptly and traced to closure.

Surveying, tolerances and documentation

Straight crane runways require tight tolerances regarding elevation, parallelism and gauge. Simple surveying with a leveling instrument, laser or tachymetric methods helps detect deviations early. Records of erection, test loads, readjustments and maintenance form the basis for reliable operation. Interfaces-e.g., between demolition crew, crane operator and power-pack operator-are recorded in sequence plans and handover points so movement of the load along the crane runway remains under control at all times.

1. Set-out and alignment: establish reference lines and elevations, check gauge and twist.
2. Mechanical checks: verify fastening torques, pad condition and expansion joints.
3. No-load run: confirm smooth trolley and bridge travel, braking and signaling.
4. Test load: proof according to specification, observe deflections and residuals.
5. Documentation: record as-built values, acceptance findings and maintenance intervals.

Digital logs with photos and measurement data, together with simple monitoring such as settlement points or vibration trend checks, ensure that gradual changes are detected in good time and corrective action can be planned with minimal disruption.