Desing and check of approval for scaffolding according the BS5975 and TG20:13. Risk assessment of hazardous related works.

1. Birdcage Scaffolding Design – Check
Konstantinos Bakas

2.  This scaffold is a real example, it was required as
access to the PS25 Pier Columns in Central
Section in order to make the sand blasting of the
columns so as to obtain a Granit look finish.
With the black concrete and the sand blasting it
should look like natural granite.
 The brief asked the scaffold to be fully clad with
sheeting
 Three lifts are required
 The ground is soil
 It will be stabilised with box-ties to concrete
column with tubes and fittings

3.  SYSTEM SCAFFOLDING
There are numerous types of system
scaffolding on the market and they all have
their good points and bad points.The type of
system scaffolding we are concentrating on
here is
 Kwikstage

5.  2 metre standard (here we use 3metre)
 3.54 metre diagonal brace.
 1.2 metre transom.
 2.4 metre Steelstage / battens.
 2.4 metre ledger.
 1.2 metre Steelstage / toeboard.
 2.4 metre Guardrail.

7.  HAZARDS
 Scaffold Design
 Scaffold Erection & Use

8.  DESIGN HAZARDS
 Wind loads
 Soil foundation
 Working Loads
 Sheeting

9.  DESIGN
For the wind loads

11. Wind loads
Directions

12.  The peak velocity pressure for formwork
erected up to two years
 TheThe fundamental basic wind velocity
vb,map is the UK
fundamental basic
wind velocity (m/s)
26m/s for Aberdeen
Meaning 93.6km/h,
over 9Beaufort , strong gale

13.  Taking under consideration :
 The topographical factor
 The reference Height

14.  …and assuming that the whole scaffold is totally
encapsulated (like a wall) meaning increased wind
loads.
 We calculate the required box-ties, the tube
required capacity.
 THEREFORE
 By assuming increased wind loads we have
eliminated the likelihood of a failure due to
windloads

15.  The soil foundation will compacted and sole
boards will be used 450*250*36mm
 The working loads will not exceed 2.0kN/m² as
requested

24.  HAZARDS
 Scaffold Erection & Use

25.  HAZARDS
 Falls from Height // Erecting or Adapting
 Falling Materials // Erecting or Adapting
 ScaffoldCollapse // Erecting or Adapting
 Impact or Collision / FallingObjects / Manual
Handling and Slips,Trips and Falls. // Delivery
and Collection of Materials

26.  Musculoskeletal disorders // Manual Handling
 Jamming causing snap - Action to hand or
wrist / Hearing loss, Dust inhalation, Hand
arm vibration // Use of power tools
 Using an incorrect or damaged tool may
cause it to slip leading to cuts and bruising //
Use of Hand tools
 Risk of Slips, trips and falls caused by poorly
maintained areas// House Keeping