Wooden formwork girder H20

Overview
Doka timber formwork beams form the basis of many Doka formwork systems and are used worldwide across a wide range of applications. The H20 series (including H20 top and H20 eco) and the XT20 variant cover different site requirements for load, handling and service life.

Variants

• XT20 — extra-tough beam, economical material use
• H20 top — sealed ends with integrated shock absorber for extended service life
• H20 eco — solid-web design, lightweight handling (versions N or P)

XT20 — Key features

• High permitted moment
  M = 7.0 kNm (DIBt approval Z-9.1-920)
• Permitted shear force
  Q = 15.0 kN (16.5 kN under specified support conditions)
• Rigidity and weight
  E x I = 585 kNm²; weight = 5.0 kg/lin. m
• Marked chords
  for fast and safe formwork set-up

H20 top — Key features

• Reduced end damage
  built-in shock absorber at beam end
• Protection against moisture and UV
  ends sealed around the web
• Easy handling and positioning
  markings on beam chords

H20 eco — Key features

• Solid-web design
  proven construction for general use
• Low weight options
  4.4 kg/m (N) or 5.3 kg/m (P) depending on web version
• End protection
  bevelled flange-ends and additional rivet

Design details (common)

• (A) Top-beam-end reinforcement (where applicable)
• (B) Web: versions P (special flat-pressed plywood) or N (three-layer board)
• (C) Beam chords marked in 50 cm grid
• (D) Two system holes at each beam end
• (E) Notch for chalk line
• (F) Printing/label on broadside; custom printing optional

Technical specifications

• XT20: Permitted moment M = 7.0 kNm; Permitted shear Q = 15.0 kN (16.5 kN with conditions); Rigidity E x I = 585 kNm²; Weight = 5.0 kg/lin. m
• H20 top: M = 5 kNm; Q = 11 kN; E x J = 450 kNm²; Weight = 5.3 kg/m (P); Certificate: EN 13377
• H20 eco: M = 5 kNm; Q = 11 kN; E x J = 450 kNm²; Weight = 4.4 kg/m (N) | 5.3 kg/m (P); Certificate: EN 13377

Materials / Notes

• *Web materials: special flat-pressed cardboard/plywood (P) or three-layer board (N)
• XT20 carries approval Z-9.1-920 where indicated; follow approval conditions for increased shear values

Characteristics / Summary

• Series: H20 (H20 top, H20 eco) and XT20 for higher loads
• Marking: 50 cm grid on beam chords for efficient mounting and alignment
• End reinforcements and sealing options available depending on variant
• Certificates: EN 13377 (H20 variants); XT20 DIBt approval as stated