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Scaffold Appreciation

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Scaffold Appreciation Session 2 Components and Terminology Right Angle Coupler Load bearing coupler used to join tubes at right angles. Universal Coupler Load bearing ... – PowerPoint PPT presentation

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Title: Scaffold Appreciation


1
Scaffold Appreciation
  • Session 2
  • Components and Terminology

2
Right Angle Coupler
  • Load bearing coupler used to join tubes at right
    angles.

3
Universal Coupler
  • Load bearing coupler used for joining tubes at
    right angles or in parallel

4
Brace Coupler
  • A coupler used for fixing braces which may be a
    right angle coupler or any other coupler capable
    of sustaining 5 KN

5
Swivel Coupler
  • A load bearing coupler for joining tubes at any
    angle when the use of a right angle coupler is
    not possible.

6
Reveal Pin
  • A fitting used for tightening a reveal tube
    between two opposing surfaces

7
Base Plate
  • A metal plate with a spigot for distributing the
    load from a standard or raker or other load
    bearing tube.

8
Toeboard Clip
  • A clip used for attaching toeboards to tubes.

9
Adjustable Base Plate
  • A metal base plate utilising a screwjack

10
Stair Tread Coupler
  • An attachment fitted on tubes to provide support
    for treads in making an access stairway.

11
Joint Pin
  • An expanding fitting placed in the bore of a tube
    to connect one tube to another coaxially, in
    compression only.

12
Final Coupler
  • A fitting which permits tubes to be joined in the
    same plane, e.g. handrails at the top of
    standards.

13
Sleeve Coupler
  • An external coupler used to join one tube to
    another coaxially.

14
Fork Head
  • A support bracket for a timber bearer or joist
    used at the top of a scaffold tube or on an
    adjustable leg.

15
Putlog Coupler
  • A coupler used for fixing a transom to a ledger,
    or to connect a tube used only as a guardrail to
    a standard.
  • NOT STRUCTURAL

16
Independent Tied Scaffolds
17
Base
  • Base
  • Level and compacted ground
  • Timber sole plates at least 220mm wide and 35mm
    thick (standard board)
  • Sole plate should support at least 2 standards
  • Do not use bricks, paving slabs etc. as they can
    shatter

18
Illustration
19
Illustration
20
Illustration
21
Standards
  • Standards
  • Vertical Tubes
  • Indepedent scaffold has 2 rows.
  • Joints should be staggered
  • Inner standard 325mm away from building
  • Spacing depends on loading

22
Ledgers
  • Ledgers
  • Horizontal tubes, that keep standards equidistant
  • Fixed with right angle couplers (not swivel
    couplers)
  • Jointed with sleeve couplers
  • Joints should be staggered

23
Transoms
  • Transoms
  • Keep the inner and outer row of standards
    equidistant
  • Transoms fixed to ledgers or standards with right
    angle or putlog couplers.
  • Should be spaced so no board overhangs by more
    than 150mm or less than 50mm
  • Should not protrude excessively

24
Bracing
  • Bracing
  • Essential to stiffen the structure
  • Ledger bracing runs diagonally from ledger to
    ledger or standard to standard in zig zag fashion
  • Facade bracing either runs across the face at 45
    or zig zag fashion.
  • Should be provided at 30m intervals
  • Joints should be made with sleeve couplers
  • Should not be removed to allow passage of
    materials

25
Ties
  • Ties
  • Means of resisting inward and outward movement of
    scaffolds
  • Must be made using right angle couplers
  • Strength of structure tied to must be established
  • Should be considered at the design stage

26
Through Ties
  • Through Ties
  • A tie assembly through a window or other opening
  • Safe working capacity 6.25 KN

27
Reveal Ties
  • Reveal Ties
  • Assembly of a reveal tube with wedges or a screw
    fitting between opposing faces of an opening
  • Safe working load 3.25KN (friction)
  • Safe working load 6.25KN (behind a load bearing
    feature)

28
Box Tie
  • Box Tie
  • Assembly of tubes and couplers usually around
    columns or other elements of the building
  • Safe working capacity 6.25KN
  • Double tied safe working capacity 12.5KN (two
    tubes and couplers)

29
Lip Tie
  • Lip Tie
  • L shaped arrangement to hook scaffolding behind
    building elements such as sills or lintels
  • Inward movement resisted by a butting transom
  • Safe working capacity 6.25KN

30
Cast In and Drilled Anchorages
  • Cast In and Drilled Anchorages
  • Provided by casting in or drilling and
    subsequently fixing a threaded anchor into the
    structure
  • Attachment of the scaffold is by means of a ring
    bolt
  • Dependent on the structural condition of the
    material
  • Safe working capacity 6.25KN
  • Pull out tests should be undertaken
  • Useful at the design stage if further scaffolding
    is required during the life of the structure.

31
Ties General Rules
  • Should be left undisturbed for the life of the
    scaffold
  • Moveable ties should be replaced prior to moving
  • Planning is essential as tie removal will make
    the scaffold less stable
  • Spacing should be 8.5m horizontally or vertically

32
Spacing of Ties
33
Working Platforms
  • Working Platforms
  • All boards should rest squarely and evenly on
    transoms
  • Each board should have at least 3 supports
  • All boards should be marked with their maximum
    span
  • Transoms should be doubled where boards need to
    butt

34
Illustration
35
Working Platforms Ctd.
  • The surface of the platform should be even to
    prevent tripping
  • Precautions must be taken to prevent boards
    lifting in high winds using straps or clamps
  • No board should overhang by more than 4 times its
    thickness, i.e. 150mm for a 38mm board

36
Platform Widths
  • 3 Boards 600mm minimum width
  • 4 Boards 800mm can be used for stacking materials
    (Most common)
  • 5 Boards 1000mm allows 600mm for barrows when
    working with stacked materials
  • 6 Boards 1200mm used by masons for dressing stone
  • When materials are deposited a clearway of 430mm
    should be maintained for pedestrians and 600mm
    for materials
  • The space between the scaffold and the building
    should not exceed 300mm.

37
Toeboards and Guardrails
  • Required at outsides and all ends of platforms
  • Should be fitted to the insides of standards
  • Toeboards at least 150mm high
  • Guardrail at least 910mm above working platform
  • No gap more than 470mm
  • Needs the use of an intermediate guardrail or
    SUBSTANTIAL brickguards
  • Brickguards are essential for platforms used for
    material storage

38
Access and Egress - Ladders
  • Ladders must be on a firm even base
  • Stiles must be securely lashed of fixed with a
    ladder clamp to a ledger or transom
  • 75 angle of 1 in 4
  • Rungs at stepping of points should be level with
    the platform
  • Higher than 9m ladders should have an
    intermediate landing
  • Ladders should be removed or boarded out of hors
    to prevent unauthorised access

39
Landing Places and Stairs
  • All intermediate landing places should be
    protected with guardrails and toeboards
  • Openings should not exceed 500mm in width
  • Stairs must be kept free of all obstructions
  • Stairs should have guardrails and handrails at
    910mm and 470mm.

40
Summary
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