European standards for workmanship and temporary works

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EN 13670 Execution of concrete structures Last updated 23/05/2008

Having been approved at a formal vote EN 13670 is currently being finalised to take on board a number of comments. It is anticipated that a draft for public comment will be available in late 2008.
 
One of the fundamental assumptions in Eurocode 2 is that the requirements of ENV 13670 for execution and workmanship are complied with. This raises a difficulty in the UK, as only ENV 13670 is currently available but without an National Application Document.
 
However, the draft background document to the National Annex to BS EN 1992-1-1, for the UK, PD6687, states that the provisions of the National Structural Concrete Specification (NSCS) are considered equivalent to those in ENV 13670 for tolerance class 1. Thus the NSCS might be used as an alternative until EN13670 and its National Annex becomes available. The NSCS currently refers to BS 8110 for some aspects. When BS 8110 is withdrawn, NSCS will be amended to incorporate the relevant requirements. EN 13670 and the corresponding National Annex, when published will take precedence.
 
Temporary Works
BS EN 12811-1: 2003 Scaffolds - performance requirements and general design
Published in June 2004, this standard supersedes BS 5973:1993 which is withdrawn. The expected Working at Height Regulations 2005 will require that calculations are available for scaffold structures - an exception being when the scaffold is built to a recognised code of practice. Unfortunately the standard solutions in BS 5973 are now withdrawn. The NASC document TG20:05 Guide on tube and fitting scaffolds has certain pre-designed arrangements of safe heights for Basic scaffolds as unclad, sheeted and with debris netting. This was published in January 2005.
 
BS EN 12811-2: 2004 Temporary works equipment - Part 2: Information on materials
Published 18th August 2004 this standard gives guidance on where to find information on materials often used in temporary works. It gives structural properties, in characteristic terms for steel, cast iron and aluminium alloys. It also includes information from other design standards, such as EN 338 for structural timber to C16, C24 and C30 grades.(20 pages ISBN 0 580 44303 5) 
 
BS EN 12812: 2004 Falsework - performance requirements and general design
Published in December 2004 , this standard specifies the performance requirements for three classes: A, B1 and B2. Limit state design methods are specified for classes B1 and B2. It does NOT provide guidance for the structural design of class A.
 
BS EN 12813:2004 Temporary works equipment - Load bearing towers of prefabricated components - Particular methods of structural design
Published in December 2004, it describes methods of establishing stiffness and strength by calculation supported by tests for steel or aluminium towers. The vertical load both with or without horizontal loads and with the top restrained or free. The annexes give analysis by first order theory, and by a global test procedure.
 
BS EN 13377:2002 Prefabricated timber formwork beams - Requirements, classification and assessment
This standard classifies the commonly used timber proprietary waling beams used in formwork into Panel type (P16, P20 and P24) and Lattice type (L24). It gives information on testing, marking and conformity. Values of the structural properties are required for characteristic ultimate shear, bending and bearing. The informative Annex E then gives "Values for site use" by stating Safe Working Loads. In the National Annex NA, for permissible stress calculations to give traditional safe working loads, the limit state strength needs to be factored, typically by 1.95.

prEN xxx Vertical Formwork - Performance requirements and General Design
The CEN committee is working towards completing a final draft. The latest draft is dated January 2002. It originally was intended to relate to proprietary panel systems for vertical formwork, but in 2003 the title changed to include ALL formwork. The UK tends to use plywood, aluminium walings and soldiers for large wall forms, not panel systems.

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