Scaffold Coupler

Scaffold Coupler is a specialized connector used in construction scaffolding systems to join steel pipes(such as vertical standards,horizontal ledgers,and diagonal braces).It assembles scattered steel pipes into a stable load-bearing framework through mechanical clamping force,serving as a core component ensuring the overall stability and safety of scaffolding.Its design is tailored to fit standard scaffolding pipes(typicallyΦ48mm orΦ51mm)and meets connection needs at various angles and functions.Below is a detailed introduction covering types,performance,applications,and specifications:

I.Main Types and Functions

Scaffold couplers are categorized by their connection methods and angles,addressing all node requirements in scaffolding erection:

Right-Angle Coupler

Structure:Consists of two vertically intersecting semicircular clamps,fastened by a central bolt.The inner curvature of the clamps matches the outer wall of steel pipes.

Function:Connects vertical standards and horizontal ledgers at a 90°angle,forming the foundational nodes of scaffolding frameworks.Ensures rigid fixation between vertical and horizontal pipes.

Swivel Coupler

Structure:One clamp is fixed,while the other rotates 360°around a central axis,lockable at any angle(0°–180°)via bolts.

Function:Joins diagonal braces(such as cross braces or flying braces)to vertical standards or horizontal ledgers,adapting to non-right-angle intersection requirements.Enhances the scaffolding’s lateral stability,especially critical in high-altitude operations or complex terrains.

Butt Coupler

Structure:Two coaxial clamps designed for end-to-end straight connection of two steel pipes.

Function:Extends pipe length when a single section is insufficient,maintaining structural continuity and consistent load transfer(e.g.,extending vertical standards or horizontal ledgers).

II.Materials and Manufacturing Standards

Materials:

Malleable Cast Iron(e.g.,KT35-10):A traditional mainstream material,formed via casting.Cost-effective with moderate strength,suitable for general load scenarios.

Low-Carbon Steel/Alloy Steel:Manufactured via stamping or forging,offering better toughness and impact resistance than cast iron.Ideal for heavy-duty scaffolding or high-load projects(e.g.,bridge construction).

Surface Treatment:To resist corrosion,couplers typically undergo hot-dip galvanizing(with a zinc layer thickness≥85μm),electro-galvanizing,or painting,ensuring durability in outdoor environments.

International Standards:Complies with standards such as EN 74-1(EU),AS 1576(Australia),and ASTM F648(USA),regulating strength,anti-slip performance,and corrosion resistance(e.g.,minimum breaking load≥15kN,anti-slip coefficient≥0.5).

III.Key Performance Requirements

Anti-Slip Performance:Clamping contact area with pipes≥70%to prevent slippage under load,reducing collapse risks.

Strength and Toughness:Withstands axial tension and shear forces without brittle fracture;bolts must resist stripping at 65N·m torque.

Weather Resistance:Resists rust in humid,high-temperature,or salt-spray environments.Hot-dip galvanized couplers typically last 5–10 years outdoors.

Universality:Standardized dimensions ensure compatibility with pipes of corresponding specifications,enabling interchangeability across brands.

IV.Applications and Importance

Building Construction:Erecting low-to-high-rise scaffolding,connecting pipes to form working platforms,protective railings,or material storage racks.

Bridges and Infrastructure:Temporary support systems and formwork reinforcement,relying on high-strength connections to ensure construction safety.

Emergency Projects:Rapid assembly of temporary passages or supports during disaster relief,leveraging the couplers’ease of use to shorten setup time.

Though small in size,scaffold couplers directly determine scaffolding stability—statistics show~30%of scaffolding accidents are related to loose or broken couplers.Thus,selection must align with project load requirements,installation must adhere strictly to torque standards(typically 40–65N·m),and regular inspections are mandatory.

V.Usage Notes

Match Pipe Specifications:Ensure coupler inner diameter matches pipe outer diameter(e.g.,Φ48mm pipes with dedicated couplers)to avoid insufficient clamping force from"small couplers on large pipes."

Prohibit Mixing:Do not mix couplers of different types or materials(e.g.,cast iron vs.steel couplers with varying load capacities)to prevent uneven stress.

Regular Inspections:Check for cracks,deformation,or bolt slippage before use.Retighten bolts every 3 months during use to prevent loosening from vibration.

Scrap Standards:Immediately scrap couplers with severe rust,opening deformation>1.5mm,or bolt failure;never reuse after repair.

In summary,scaffold couplers are the"joints"of scaffolding.Their quality and proper use are critical to construction safety,making them irreplaceable in the building industry.