3 rd October 2017

Transkript

1 3 rd October 2017

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14 Failures of Scaffold False work Failures Form work Bursting Trench Support Failure Hoarding Failures Can be expensive and result in fatalities and serious injuries

15 Cardiff 2000 Details

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17 89 mph winds Should have been designed for 130 mph wind speed Design changed on site without consultation with designer 91 of the required 300 anchor ties installed Top 6m of scaffold had no fixings

18 Principal contractor did not get design checked or check scaffold after installation No scaffold register No weekly inspections

19 Took British Army 36 hours to make safe at a cost of 10M Railway closed for 5 days at a cost of 52M Cost Taylor Woodrow Construction a total of 65M Taylor Woodrow sold to Vinci Total HSE fines 320,000

20 BSI Standards Publication BS 5975:2008+A1:2011 Code of practice for temporary works procedures and the permissible stress design of falsework

21 BRITISH STANDARD BS 5975:2008+A1:2011 Section 1: General 1 Scope This British Standard gives recommendations and guidance on the procedural controls to be applied to all aspects of temporary works in the construction industry. It also includes guidance on design, specification, construction, use and dismantling of falsework. This standard gives guidance on permissible stress design of falsework. This guidance is also applicable to the design of what is termed class A falsework1) in BS EN 12812:2004, the design of which is specifically excluded from BS EN 12812:2004. Section 2 gives recommendations for the procedures required to ensure that temporary works are conceived, designed, specified, constructed, used and dismantled all in a safe and controlled manner. Section 3 covers the design of temporary works and in particular the design of falsework and relevant formwork. In addition Section 3 covers: materials including material factors; loads and load factors; design of falsework, including both proprietary equipment and traditional scaffolding solutions; wind loading (reference to temporary and permanent stability) and reference to other British Standards for the design of structural steelwork, reinforced concrete and excavation support. The structural design element in this standard is additional information necessary for the structural design of falsework. It can be used in conjunction with existing structural standards.

22 Principal Contractor Designated Individual TWC TWS Contractor TWS Temporary Works Designer Liaise with TWC and provide solution based on the design brief

23 Temporary works is an engineered solution used to support or protect either an existing structure or the permanent works during construction, or support an item of plant or equipment, or the vertical sides or sideslopes of an excavation during construction operations on site or to provide access

24 Every organisation involved in temporary works must have a designated individual (DI) Establish and implement procedures in their organisation Ensure contractors have adequate procedures if they are carrying out and managing works

25 Appointed by DI of the Principal Contractor Must be experienced (Competent) Design brief to designer TWC responsible for ensuring the design is implemented on site

26 Provides Assistance to the TWC Appointed by Principal Contractor or contractor May be several TWS s on a project Permit systems Load, Strike

27 Serves as starting point for subsequent decisions, design work, calculations and drawings. All concerned with the construction should contribute towards the preparation of the brief Collated by the TWC from various sources and will include details of permanent works and construction programme Forward to temporary works designer

28 Competent designer provides information, drawings, calculations etc. Four categories of design check required depending on complexity of temporary works Standard solutions may be used such as trench boxes

29 CSkills Courses Available TWC 2 Day Course TWS 1 Day Course TWA 1 Day Course MSc in Temporary Works, University of London

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