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DOVA
Contractor & Site Engineering Tools
TEMPORARY WORKS CALCULATORS & LOAD SPECIFICATIONS

Contractor & Site Engineering Tools

Interactive scaffolding & slab shoring calculators, official BS/EN load capacity charts, and downloadable safety compliance manuals for construction sites across Nigeria.

Instant Site Estimator Engine

Input your job-site structural dimensions below. Our engineering formulas calculates and returns an instant estimate frame counts, prop spacing, and H20 beam lengths so you avoid shortages or overspending on equipments.

CALCULATOR 01 • FACADE ACCESS

“How Many Scaffolding Frames Do I Need?” Calculator

Calculate standard 48.3mm scaffold frames, cross braces, catwalk planks, and base jacks required for your facade elevation.

Wall / Facade Elevation Length18 Meters
4m (Small Bay)40m80m (Commercial)
Facade Working Height12 Meters (6 Lifts)
2m (Single Lift)20m40m (High-Rise)
Estimated Bill of Quantities (BOQ)Coverage: 216 sqm
Main H-Frames120Standard 2.0m x 1.2m
Cross Braces108Pairs for structural rigidity
Steel Catwalk Planks54Non-slip perforated deck
Adjustable Base Jacks20For level foundation seating
Guardrail Posts & Rails36Top safety edge containment
Wall Anchors & Ties27To anchor structure to concrete
CALCULATOR 02 • FORMWORK/DECKING DESIGN

Concrete Slab Shoring & Acrow Prop Calculator

Calculate safe prop density, primary girder meters, and four-way forkheads based on slab volume and floor height.

Slab Surface Floor Area150 Square Meters (sqm)
20 sqm400 sqm800 sqm
Recommended Prop Spec: Size 2 (1.98m - 3.35m). Heavy-duty high-tensile collar nut and pin.
Calculated Formwork ScheduleLoad: 1316 kN factored
Acrow Props Needed74 Units~1.2m x 1.2m grid spacing
Primary H20 Girders143.75 mDirectly seated in forkheads
Secondary H20 Joists345 mCross joists spaced at 40-50cm
Four-Way Forkheads74 UnitsTo hold primary H20 beams
CALCULATOR 03 • SHUTTERING FACING

Marine Board & Shuttering Plywood Estimator

Calculate standard 18mm 4ft x 8ft phenolic film-faced sheets with cutting waste and planned pour cycle recovery.

Total Formwork Contact Surface (Slabs, Walls, Beams)250 sqm
Plywood Requirements Output
Sheets Per Pour93Standard 18mm 4ft x 8ft
Recommended Order62 SheetsBased on 2x cycle re-use