JGJ/T 74-2017 in English
VALIDTechnical standard for large一area formwork of building construction
- Issued on:2017-12-04
- Implemented on:2018-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$600.00
$582.00
$582.00
Introduction
Key points of the standard revision
| Revised content | Original standard requirements | Changes in the new standard |
|---|---|---|
| Definition of terms | Unclear subsystem definition | Added 7 subsystem definitions such as panel system and support system |
| Structural design | Specific material and process requirements | Changed to functional requirements + supplementary panel splicing safety clauses |
| Self-stabilizing angle calculation | Single calculation formula | Added wind speed correspondence table + 10°~20° limit provisions |
Analysis of key technical parameters
4.3 Panel design formula
Calculation of interior wall formwork height: Hn=hc-hl+a (lap size a is 10-30mm)
Calculation of exterior wall formwork height: Hw=hc+a (a≥50mm)
4.4.4 Calculation of self-stabilizing angle
Critical formula: α≥(180/π)×arcsin(k×wk/P)
Application case: When the self-weight of the formwork P=0.5kN/m² and the wind speed is level 8 (wk=0.5kN/m²), it is calculated that α≥16.2°, and the actual value should meet 10°≤α≤20°
Key points for construction quality control
- Installation allowable deviation: axis position ≤4mm, verticality ≤3mm (story height ≤5m)
- Removal conditions: concrete strength ≥1.2N/mm² (non-load-bearing parts)
- Wind speed limit: stop lifting when ≥15m/s, and require a comprehensive inspection when ≥20m/s
Implementation suggestions
- Preferably use the assembled large formwork system, and the length direction of the formwork should be consistent with the component
- Tension bolts should be made of Q235B steel with a diameter ≥M28, and the back ribs should be arranged in a direction perpendicular to the direction of the panels
- Self-stabilizing angle requirements should be ensured during storage, and the stacking height should be ≤2m with pads
Sample only — not a preview of JGJ/T 74-2017
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