Scaffold frames must be pinned or secured together whenever they are assembled to form a stable structure-this is a critical safety requirement to prevent collapse, displacement, or structural failure during use.
This is a core principle of scaffold safety. According to standards like OSHA 29 CFR 1926.452, frames and panels must be connected by cross, horizontal, or diagonal braces, or a combination thereof, which secure vertical members together laterally.
1.During initial assembly (all frame connections)
Every vertical upright (standard) must be pinned/secured to horizontal cross members (ledgers) at each joint.
Reason: Prevents accidental disconnection during assembly; establishes the basic load-bearing skeleton.
Requirements: Use manufacturer-matched pins, clips, or locking collars (never substitute with wire, rope, or non-standard fasteners).
2. When the scaffold height exceeds 1.8m (6ft)
For scaffolds taller than a single platform height:
All vertical and horizontal connections must be fully secured (no "loose-fitting" joints).
Diagonal braces (cross bracing) must also be pinned to frames at both ends to resist lateral forces (e.g., wind, worker movement).
Reason: Taller structures are more susceptible to instability; full securing ensures load distribution across the entire frame.
3. Before placing working platforms or applying loads
No workers, tools, or materials may be placed on the scaffold until:
All frame joints are pinned/secured.
Platforms are properly supported by secured frames (not resting on loose connections).
Reason: Unsecured frames cannot safely bear dynamic or static loads, leading to platform collapse.
4. When extending or modifying the scaffold
During height extensions, adding bays, or reconfiguring frames:
Newly added frames must be secured to existing frames before proceeding.
Modifications (e.g., removing a cross member temporarily) require additional bracing to maintain stability until the frame is re-secured.
Reason: Prevents structural weak points during changes to the scaffold's geometry.
5. In outdoor or exposed environments
For scaffolds used outdoors, near traffic, or in windy conditions:
Extra securing (e.g., double pins at critical joints) may be required.
Frames must also be tied to the building/structure (tie-ins) at specified intervals, in addition to being pinned together.
Reason: Resists lateral forces (wind, vibration) that could loosen unsecured joints.
6. When the scaffold is used for heavy-duty applications
For scaffolds supporting heavy loads (e.g., construction materials, equipment):
All joints must be "locked" (e.g., twist-lock pins, bolted connections) rather than just loosely inserted.
Manufacturer's load ratings must be followed, with secured connections ensuring load transfer without slippage.
Reason: Heavy loads amplify stress on joints; locked connections prevent shear failure.
Pinning/securing is not optional-it is a mandatory requirement in all jurisdictions to protect workers from falls or scaffold collapse. Inspect all connections daily before use; replace damaged pins or frames immediately.
For specific standards, refer to:
OSHA 1926.451 (U.S.)
GB 51246-2017 (China)
EN 12811-1 (EU)
If you need details on fastener types (e.g., cotter pins, twist locks) or frame connection diagrams,please contact us.
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