Lattice tower/mast

The term lattice tower/mast refers to a load-bearing component in truss construction that takes up high loads at comparatively low self-weight and safely transfers them. Lattice towers/masts characterize cranes, hoists, scaffold towers, radio and power transmission lines, as well as work platforms. In construction, demolition and extraction, they form the structural basis for lifting, positioning, and safely dismantling heavy components. For applications by Darda GmbH – such as concrete demolition and specialized deconstruction, gutting and cutting works – lattice towers/masts provide the necessary reach, stability, and control to bring tools like concrete pulverizers, steel shears, or hydraulic wedge splitters safely and efficiently to the point of use. In practice, the terms lattice boom and trussed mast are also used where modular segment systems enable rapid adaptation to task-specific geometries.

Definition: What is meant by a lattice tower/mast?

A lattice tower/mast is a bar-shaped load-bearing structure made of slender sections (tubes, angles, box sections) that are joined via nodes into a three-dimensional truss. Through the arrangement of diagonals, chords, and struts, tension and compression forces are distributed in a targeted manner, buckling lengths are reduced, and material is used optimally. Typical are modular mast segments with pin or plug connections that can be combined depending on the required outreach, height, and load-bearing capacity. Lattice towers/masts are used as jibs on crawler or mobile cranes, as tower elements on tower cranes, as free-standing towers, as guyed masts, or as shoring frames. They are designed for defined load cases (self-weight, payload, wind, vibrations) and must be inspected regularly. Typical segment lengths and cross-sections are standardized within the respective system families, allowing predictable assembly times, transport dimensions, and consistent interface geometry to slewing rings, winches, and rigging.

Design, structural behavior, and operating principle of a lattice tower/mast

The load-bearing action of a lattice tower/mast is based on short load paths through bar elements with clear force lines. This results in high stiffness at low weight – ideal for lifting technology and temporary load-bearing structures in construction and deconstruction environments. Efficient triangulation minimizes secondary bending and enables reliable force transmission into foundations, slewing platforms, or carrier machines.

Components and connections

• Top chord and bottom chord: primarily carry tension and compression forces and form the contour of the mast.
• Diagonals and verticals: redirect shear forces, shorten buckling lengths, and stabilize the cross-section.
• Nodes: executed as welded gusset plates, cast parts, or tubular joints; decisive for fatigue strength.
• Segment and system connectors: bolted, lug, or plug connections for rapid assembly and disassembly.
• Lacing patterns and panel geometry: influence stiffness, vibration behavior, and fatigue performance under cyclic loading.
• Pins, bolts, and locking devices: require defined pretension or securing to prevent loosening; corrosion-protected bearing surfaces reduce wear.

Load assumptions and stability

• Static loads: self-weight, payload, attachments, and rigging.
• Dynamic effects: starting shocks, vibrations, load cycles, rope oscillations, pendulum motions.
• Environmental actions: wind pressure, temperature, humidity; for tall masts, also icing.
• Stability verifications: buckling of compression members, overturning of the overall system, torsion, flexural buckling.
• Support conditions and ground: bearing capacity of subsoil, support pressures, ballast or guying design for overturning resistance.
• Fatigue and resonance: assessment for relevant stress ranges, avoidance of critical eigenfrequencies in typical operating spectra.

Materials and protection

High-strength steels with good weldability are customary. Corrosion protection is provided by hot-dip galvanizing, multi-layer paint systems, or metallic coatings. Regular visual and crack inspections extend service life and ensure readiness for use. Depending on utilization and environment, non-destructive testing of critical nodes and connectors, defined replacement criteria for wear parts, and documented coating maintenance improve availability and safety.

Lattice tower/mast in construction, demolition, and extraction

On construction sites, lattice towers/masts primarily serve to increase reach and load capacity. They enable controlled lifting, holding, and lowering of components and machine parts – crucial when hydraulic tools are used for selective cutting, separating, or splitting. The combination of defined load paths and precise positioning supports low-vibration work methods and reduces collateral impacts on adjacent structures.

Concrete demolition and specialized deconstruction

When dismantling tall or slender structures (chimneys, support towers, bridge spans), lattice-mast cranes enable safe positioning of components that are then specifically cracked with concrete pulverizers or separated with steel shears. By sequentially setting down individual segments, loads are minimized, vibrations are reduced, and adjacent areas are protected. In structures with limited accessibility, loads can be led out of the hazard zone via lattice jibs. Clearly structured lifting and exclusion concepts with tag lines, defined cut sequences, and monitored wind limits further enhance process safety.

Gutting and cutting

During selective deconstruction in existing buildings, lattice tower/mast solutions temporarily hold loads in position while Multi Cutters or combination shears separate reinforcement and sections. Tanks and vessels can also be removed in a controlled, sectional manner; in this process, tank cutters or steel shears are used while the mast safely lifts out and sets down the parts. Fire watch, fume extraction, and spark protection may be necessary where hot cutting processes are applied within confined spaces.

Rock demolition and tunnel construction

In steep terrain, shafts, or at tunnel portals, lattice towers/masts are used to bring equipment, drill carriages, or cutting tools into exposed areas. These setups are common in rock demolition and tunnel construction. Hydraulic wedge splitters as well as stone splitting cylinders benefit from the controlled positioning of heavy drilling and splitting packages. Hydraulic hoses and hydraulic power units for tools can be routed so that operating and hazard zones are cleanly separated. Remote operation and clear cable management reduce tripping hazards and allow work from protected positions.

Natural stone extraction

When releasing large rock blocks, splitting cylinders are set after drilling and block assemblies are opened in a controlled way. Lattice-mast cranes lift and rotate the blocks without overloading the fracture edges. This protects material and reduces damage in the stockpile. Edge protection, suitable slinging gear, and balanced pick points prevent chipping and uncontrolled rotation.

Special deployments

For operations over water, in industrial plants, or in confined yards, modular lattice tower/mast configurations with adapted outreach are used. Temporary guying increases stiffness in windy conditions. For nighttime or weather-affected work, clearly defined lifting and exclusion zones are essential. Compact transport modules, low setup footprints, and standardized interfaces support efficient deployment in restricted areas.

Equipment and tools in interaction with lattice towers/masts

In combined operations, the mast assumes the roles of positioning, securing, and controlled removal while the tool performs the material separation. Matching tool capacity, mass, and hydraulic supply to the mast configuration is essential for balanced system behavior.

• Concrete pulverizers: for the selective removal of reinforced concrete components that have previously been secured against falling or relieved by the lattice tower/mast.
• Hydraulic wedge splitters: low-vibration opening of concrete or rock structures; the mast handles heavy components and safely removes released parts.
• Steel shears and Multi Cutters: for cutting steel sections, reinforcement, and composite members, often in combination with the mast’s lifting and holding functions.
• Tank cutters: for controlled segmenting during tank deconstruction; the lattice tower/mast enables defined placement of segments.
• Combination shears: flexible when switching between cutting and crushing, especially on composite cross-sections.
• Stone splitting cylinders: used in extraction and specialist foundation works; mast guidance facilitates alignment and positioning.
• Hydraulic power units: supply the tools mentioned; the mast supports the safe routing of supply lines and handling of heavy units.

Assembly, disassembly, and logistics of lattice towers/masts

1. Planning: load charts, outreach, lifting paths, ground conditions, wind limits; selection of suitable mast configurations.
2. Preparation: define load pickup, check attachment points, size lifting gear and rigging, establish exclusion zones.
3. Assembly: bolt segment by segment, visual inspection of nodes, test slewing and swiveling functions; document the assembly.
4. Operation: clear communication, slow load changes, vibration limitation, adherence to operating limits.
5. Disassembly: relieve, secure, and dismantle segment by segment; transport and interim storage with edge protection and correct stacking.

Safety, inspections, and normative notes

Lattice towers/masts are subject to regular visual and functional inspections. Manufacturer specifications, recognized rules of technology, and general occupational safety requirements are decisive. Only adequately qualified personnel may be used for lifting tasks. Load charts, wind limits, and setup conditions must be strictly observed. The information provided here is general and does not replace project-specific planning or binding specifications.

• Inspection focus: node welds, connectors, chord straightness, corrosion, fastener pretension, wear at bearing points.
• Documentation: assembly records, pre-use checks, defect logs, maintenance plans, and calibration certificates for critical equipment.
• Process control: toolbox talks, exclusion zone management, tag line use, and clear hand signals or radio protocols.

Material selection, corrosion protection, and service life

Service life depends on material quality, corrosion protection, and the load spectrum. Hot-dip galvanizing and multi-layer coating systems protect against corrosion. In harsh environments (coastal, industrial atmosphere, tunnels), tighter inspection intervals are advisable. In maintenance, particular attention must be paid to stress raisers at nodes and fatigue-relevant details. A structured life-cycle file with utilization, incidents, and coating renewals supports reliable remaining life assessments.

Wind, vibrations, and operation in weather

Wind induces additional moments and can cause the load to swing. Measures such as reduced outreach, additional guying, wind measurement, and damped operating modes increase operational safety. In rain, ice, or dust, friction values and visibility must be considered; operation may need to be adjusted or suspended. Use of calibrated anemometers, gust factor consideration, and defined stop criteria provide clear decision thresholds during changing weather.

Distinction from box and telescopic masts

Lattice towers/masts offer high stiffness at low self-weight for large outreaches and are modularly extendable. Box-section booms score with compact construction and a lower tendency to collect dirt, while telescopic masts excel with rapid length adjustment. In demolition and extraction projects, the load profile is decisive: for heavy components with large reach, the lattice tower/mast is often preferred; for frequently changing sites and limited working heights, telescopic solutions have advantages. Transport in standardized segment lengths and cross-sections simplifies logistics and crane setup planning.

Planning and cooperation on the construction site

Successful projects are based on coordinated workflows between crane operation, carrier machines, and the operators of hydraulic tools. A clear lifting and separation concept defines sequence, attachment points, separation locations, and setting-down areas. In this way, tools such as concrete pulverizers, steel shears, and hydraulic wedge splitters can be deployed in a targeted manner while the lattice tower/mast ensures safe load handling. Pre-task briefings, shared signaling protocols, and verified interfaces between mast, rigging, and tooling reduce delays and enhance overall process stability.