Health and and Safety Executive. Temporary Works. Phil Chester HM Inspector of Health and Safety

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1 Health and and Safety Executive Temporary Works Phil Chester HM Inspector of Health and Safety

2 Legal obligations CDM Regulations 2015 Reg 4(4) client s duty to provide pre-construction information, e.g. ground conditions structural drawings; Reg 8 requirement for all those with a role to discharge in the planning, design & execution of TW to have the skills, knowledge and experience and, if they are an organisation, the organisational capability; Reg 8 co-operation of persons with duties under these Regulations to enable any person with a duty or function to fulfil that duty or function, including TW; Reg 9 duties of designers: avoidance of foreseeable risk arising from preparing or modifying designs; Reg 11 duties of Principal Designer: to ensure all designers comply with their duties and to ensure co-operation between designers, clients, the Principal Contractor and others involved in the pre-construction and construction phase;

3 Legal obligations CDM Regulations 2015 Reg 13 duties of the Principal Contractor to plan, manage & monitor the construction phase & co-ordinate matters relating to health & safety during the construction phase; Reg 15 duties of Contractors to plan, manage & monitor construction work carried out by them or by workers under their control; Reg 17 safe places of construction work scaffolding, flooring, stairs etc; Reg 19 stability of structures: any buttress, temporary support or temporary structure must be designed, installed and maintained so as to withstand foreseeable loads; Reg 20 demolition or dismantling: planning and recording of arrangements; Reg 22 excavations: planning and execution; Reg 23 cofferdams & caissons: design, planning & execution

4 Temporary Works Procedure Appointment of a Temporary Works Co-ordinator (TWC) Completion and maintenance of a Temporary Works Register Preparation of design briefs for elements identified in the register Production of temporary works designs Temporary works design check Preparation of risk assessments/method statements Pre-erection inspection of the TW materials and components Supervision of erection of temporary works Check that the TW have been erected in accordance with the design Issue a formal permit to load where necessary Confirm that the TW have attained adequate strength to allow TW to be dismantled Issue a formal permit to dismantle where necessary

5 Planning & Strategy Temporary works co-ordinator There must be ownership of the scheme at all stages An outline solution and method statement should be provided Experienced supervision

6 Why are temporary works important? GOOD temporary works can bring: Better safety; Enhanced efficiency, quality, productivity; and More certainty on completion times and cost.

7 Legal Requirement The legal requirement is that the party in control must ensure that work is allocated and carried out in a manner that does not create unacceptable risk of harm to workers or members of the public There is no legal requirement to use TWC job title or the BS recommended process, but you should remember that BS5975 provides an industry consensus view on what is considered to be good practice.

8 What happens when TW go wrong? Causes: No (or inadequate) TW procedure No (or inadequate) TWC appointed Lack of competent contractor/developer/ builder No (or inadequate) TW design Inadequate design brief or failure to carry out proper investigation of ground conditions, underground services or structural condition of existing buildings Unauthorised changes to an approved TW design Lack of competent TW designer and/or erectors

9 What happens when TW go wrong? Causes: Incorrect estimation of loads to be supported (overloading) Lack of adequate lateral stability: inadequate horizontal and/or diagonal bracing to resist lateral (wind) loads Inadequate foundations No temporary works equipment available Inappropriate use of TW equipment or other non TW equipment being used for the purpose of TW TW poorly constructed

10 What happens when TW go wrong? Consequences: Collapse or failure of the TW; Structural failure and/or collapse of the permanent works; Uncontrolled ingress or egress of materials, spoils or water; Collapse of adjacent structures; Risk of fatalities and injuries to workers and members of the public; Delays and increased costs; and Financial & commercial risks to contractors, subcontractors, designers, suppliers & clients.

11 Basement construction, London E17

12 Basement construction, London E17

13 When it goes wrong Was the contractor competent? Was the initial construction phase plan suitable?

14 CASE STUDIES

15 AA Fanum House, Cardiff Scaffold collapse, 13 December 2000

16 White Hart Lane, London

17 Shanghai June 2009

18 Shanghai June 2009

19 Shanghai June 2009

20 Shanghai June 2009

21 Shanghai June 2009

22 Shanghai June 2009

23 Shanghai June 2009

24 Shanghai June 2009

25 Shanghai June 2009

26 Shanghai June 2009

27 What is HSE doing? Current Aims for Temporary Works Promote awareness & knowledge of the importance of managing TW effectively; Improve contractors management arrangements for TW; Increase the competence of those involved in TW management & design; and Reduce accidents arising from TW failures

28 Sources of information HSE website - SIM 02/2010/04 The Management of Temporary Works in Construction BS5975:2008+A1:2011 Code of practice for temporary works procedures and the permissible stress design of falsework

29 Any questions?