Slab falsework — tube & fitting

A tube & fitting birdcage for a slab pour up to 4 m high: grid, bearers, standards, bracing and ground.

BS 5975:2019
BS EN 1991-1-4 + UK NA
BS EN 39
BS EN 74-1

Standard grid, primary and secondary bearers
Standards, forkheads, base jacks and sole plates
Wind, bracing line by line and overturning
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Project name

Calculation ref

Revision

Prepared by

Checked by

Slab length

1 – 60 m

Slab width

1 – 40 m

Slab depth

100 – 700 mm

Height h, top of sole board to top of forkheads

1 – 4 m

Top jack (forkhead) extension

0.1 – 0.6 m

Base jack extension

0.1 – 0.6 m

Calculation mode

Concrete

Storage allowance

0 – 10 kN/m²

Formwork self-weight

0.2 – 2 kN/m²

Falsework self-weight at bearer level

0.05 – 1 kN/m²

UK region (vb,map)

Site altitude A

0 – 1000 m

Topography

Terrain

Solid edge protection / sheeting at deck edge

0 – 2 m

Ground — allowable bearing pressure

Ground examined / site investigation done

Base plate size

Under each base plate

Sole board width

100 – 600 mm

Sole board thickness

25 – 150 mm

Sole board length

300 – 3000 mm

Timber permissible bending stress

1 – 30 N/mm²

Timber permissible shear stress

0.2 – 5 N/mm²

Timber permissible compression perpendicular to grain

0.5 – 10 N/mm²

Source of the timber values (required)

Forkhead SWL at the entered extension

1 – 200 kN

Base jack SWL at the entered extension

1 – 200 kN

Source of the jack / forkhead SWL (required)

Falsework system

Scaffold tube

Deflection limit

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