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Rigging calculations
A fire-rated door weighs up to 250 kg, a gate leaf up to a tonne, and a partition glazing unit more than a tonne. We calculate and agree the route of every unit from the truck bed to the opening before dispatch. When the load arrives on site, it is already known what will lift it, which way it goes and how it is set — without damage to the façade, finishes or the products themselves.
SUPERCARGO ON STAFF
One specialist is responsible for the load — from calculation to opening
DPS employs a dedicated supercargo. He calculates weights and centres of gravity, selects equipment and lifting accessories, prepares slinging diagrams and personally directs the lifting of heavy and oversized units to height. Calculation, loading at the factory, delivery and lifting are handled by one person — information is not lost between subcontractors and responsibility is never blurred.
What we account for in the calculation
How we lift and install
Door sets and gates
Spreader beam and textile slings with edge protectors. The slings run vertically and do not crush the leaf, frame or packaging. We never use chains on finished surfaces.
Glass and glazed leaves
A vacuum lifter on a mini crane or loader crane. The lifter tilts the glass through 90° and holds it on suction pads with a vacuum reserve and a safety sling. It leaves no marks on the surface.
Heavy glazing units
If the weight exceeds the rated capacity of one lifter, we fit two or more lifters to a spreader beam. The load is distributed and the glass does not deflect.
Along the floor and into the opening
Glass travels on A-frames and rigging trolleys, doors on roller skates. Large panes are placed into the opening by a glazing robot; small ones are set by hand with vacuum handles.
Equipment
Tracked mini cranes
They fit through a door opening, run on mains power inside the building and stand on outriggers on the floor slab.
Loader cranes and mobile cranes
Unloading from the truck and lifting to upper floors via window openings and loading platforms.
Vacuum lifters
For glass and panels, with rotation and tilting, alarms and vacuum reserve.
Glazing robots
Precise positioning and installation of glass in the opening without manual carrying.
Spreader beams and slings
Textile slings, spreader beams, protectors — tagged and marked with inspection records.
Rigging trolleys
Roller skates, A-frames, tracked stair climbers.
Winches and hoists
Lifting through shafts, slab openings and wherever there is no room for a crane.
Finish protection
Floor coverings, corner profiles on reveals, soft padding.
We prepare the load at the factory
Marking
The packaging shows the weight, centre of gravity, lifting points, floor and opening reference from the specification.
Packaging designed for the lifting method
Tilting frames, A-frames for glass, edge corners. The packaging is designed for a specific lifter.
Loading sequence
The truck is loaded in reverse installation order: what is installed first comes off first.
Packing and container shipment
For remote projects and from overseas production sites, units travel in sea and rail containers. We pack the load to withstand transhipment, rolling and temperature swings and to arrive without a single scratch.
Pallets and crating
Doors and frames are stacked on pallets and enclosed in timber crating sized to the weight and dimensions of the consignment.
Surface protection
Film, edge corners, spacers between leaves — finishes do not rub under vibration.
Bracing
Spacer beams, wedges and straps: the load does not shift during rolling or container transhipment.
Desiccants
Hung according to container volume — protection against condensation when crossing climate zones.
Container inspection
Before loading — a weathertightness check: no leaks or holes, doors and seals in good order, floor dry.
Seal and documents
Photographic record of loading, stowage plan, packing list with opening references, seal on the doors.
Standard slinging diagrams
- Angle between sling legs — no more than 90°; for larger angles we use a spreader beam
- Slings and lifters are selected for the load weight with a safety margin
- Protectors on sharp edges; slings do not touch glass or finishes
- All lifting accessories are tagged, stamped and recorded in the inspection log
- Before lifting — a trial lift of 200–300 mm and a slinging check
Site safety
- The danger zone under the load is fenced off and kept clear
- One banksman giving signals, with radio contact to the crane operator
- Before lifting glass — check of the lifter vacuum and alarm
- Work stops if wind exceeds the equipment's rated limit
- Rigging only in daylight or with the work area lit to standard; no lifting in fog, snowfall or at dusk
- Hard hats, safety footwear, gloves and hi-vis vests for everyone on site
Hand signals
Handling glass and timber
Glass
High cut-resistance gloves with a non-slip coating, arm guards, safety glasses, footwear with protective toecaps. Glass edges stay covered with profiles until installation, and lifters are vacuum-checked before every lift.
Timber doors
Transported and stored in a dry, warm room without sharp temperature changes. Leaves acclimatise to the building before installation and are lifted only into a closed building envelope — no rain, snow or frost. Veneer and lacquer are protected by film and corners until handover.
Permits to work and documents
A permit to work is written authorisation for hazardous work. It states the crew, responsible persons, safety measures and timeframes. We issue it before work starts and close it afterwards, and the crew receives a task-specific briefing, signed off.
Crane work execution plan
Work execution plan: equipment positions, danger zones, slinging and storage diagrams.
Method statement
Sequence of loading, unloading and rigging operations for each product type.
Permit to work
Work at height, in the confined conditions of an occupied building, and work concurrent with other contractors.
Briefings
Site induction, workplace briefing and task briefing before lifting — recorded in the logs.
Lifting accessories inspection log
Slings, spreader beams and lifters are inspected before work; defective items are withdrawn.
Site access
General contractor's access certificate, workforce lists, slinger certificates and work-at-height permits.
Team and certifications
Installers are certified slingers
All DPS staff installers are certified as slingers. One crew handles the load from unloading to the opening.
Health and safety
Health and safety training and assessment, work-at-height permits, a person responsible for safe operation of lifting equipment.
Documents
Work execution plans and method statements, slinging diagrams, permits to work, lifting accessory inspection logs.
How the work is done
Site inspection
Entry, unloading area, equipment, handling routes, lifts, floor slabs, façade.
Calculation
Weights, centres of gravity, loads, selection of equipment and lifting accessories.
Diagrams and work execution plan
Slinging and handling diagrams, method statements, agreement with the general contractor.
Preparation at the factory
Packaging and marking for the chosen lifting method, loading sequence.
Delivery and unloading
Trucks arrive to the work-zone schedule; unloading follows the plan.
Lifting and installation
Directed by the supercargo; afterwards, products and finishes are checked for damage.
Regulatory framework
What's included
- Calculation of package weights and dimensions
- Unloading and storage plan on site
- Selection of rigging gear and lifting equipment
- Lifting and handling route through the building: lifts, stairs, openings, cranes
- Delivery sequence by floor and work zone
- Requirements for the general contractor to support rigging
- Slinging diagrams, work execution plans and method statements
- Packing, loading and bracing of cargo in containers
- Direction of lifting of heavy and oversized units
Result
A rigging plan, slinging diagrams and delivery schedule agreed with the site. The load arrives at a site where everything is ready for lifting.
What we need from the client
- Site logistics plan
- Details of cranes and hoists on site
- Access and unloading restrictions
- Floor slab load data and lift details
Timing and cost depend on the scope of work and are calculated for each project.
Let's discuss your project
Send us your documentation or door schedule — we will reply with a scope of works and costing.
Phone: +7 958 644 06 47