EN 12812:2004

Falsework - Performance requirements and general design

This European Standard specifies performance requirements and limit state design methods for two design classes of falsework.
It sets out the rules that a designer has to take into account to produce a safe falsework structure.
It also provides information for the person who requires falsework to support a "permanent structure" and who needs to commission its design or supply.
This European Standard also gives information on foundations.
This European Standard does not specify requirements for formwork, although formwork may be a part of the falsework construction. Nor does it provide information on access and working scaffolds, which is given in EN 12811-1:2003.
This European Standard does not provide information about site activities. It does not provide information about the use of some standardized products, including beams conforming to EN 13377 and props conforming to EN 1065.

Traggerüste - Anforderungen, Bemessung und Entwurf

Diese Europäische Norm legt Anforderungen und Verfahren für die Bemessung von Traggerüsten im Grenzzustand der Tragfähigkeit für drei Bemessungsklassen fest.
Sie gibt die Regeln an, die ein Konstrukteur zu beachten hat, um eine sichere Traggerüstkonstruktion zu entwerfen.
Sie liefert weiterhin Angaben für Personen, die für die Unterstützung von "Dauerbauwerken" Traggerüste benötigen und deren Bemessung oder Lieferung in Auftrag geben müssen.
Diese Europäische Norm enthält auch Angaben zu Gründungen.
Die vorliegende Europäische Norm legt keine Anforderungen an Schalungen fest, obwohl diese Teil der Traggerüstkonstruktion sein können. Sie liefert ebenfalls keine Angaben zum Zugang und zu Arbeitsgerüsten; die entsprechenden Angaben sind in der prEN 12811:1997 zu finden.
Diese Europäische Norm enthält keine Angaben über Tätigkeiten an der Baustelle. Sie liefert auch keine Angaben zur Anwendung bestimmter genormter Produkte, einschließlich Träger nach EN 13377 und Bau-stützen nach EN 1065.

Etaiements - Exigences de performance et méthodes de conception et calculs

La présente Norme européenne spécifie les exigences de performance et les méthodes de calcul aux états-limites pour trois classes d'étaiement.
Elle définit les règles que doit respecter le concepteur pour prendre en compte la réalisation d'une structure d'étaiement sûre.
Elle fournit également des informations destinées aux personnes ayant besoin d'un étaiement pour supporter une "structure permanente" et de commissionner son calcul ou sa livraison.
La présente Norme européenne donne également des informations sur les fondations.
La présente Norme européenne ne spécifie pas les exigences relatives aux coffrages, bien que ces derniers peuvent faire partie d'une construction d'étaiement. Elle ne fournit pas non plus d'informations sur l'accès à et les travaux sur les échafaudages, qui sont spécifiées dans le prEN 12811:1997.
La présente Norme européenne ne donne pas d'informations sur les activités sur site. Elle ne fournit pas d'informations sur l'utilisation de certains produits normalisés, comprenant notamment les poutrelles de coffrage conformes à l'EN 13377 et les étais conformes à l'EN 1065.

Nosilni odri – Zahtevane lastnosti in projektiranje

General Information

• Status: Withdrawn
• Publication Date: 08-Jun-2004
• Withdrawal Date: 15-Jul-2008
• ICS: 91.220 - Construction equipment
• Technical Committee: CEN/TC 53 - Temporary works equipment
• Drafting Committee: CEN/TC 53/WG 6 - Performance requirements for falsework
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 16-Jul-2008
• Completion Date: 16-Jul-2008
• Ref Project: SIST EN 12812:2004 - Falsework - Performance requirements and general design

Relations

• Replaced By: EN 12812:2008 - Falsework - Performance requirements and general design
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2004
Nosilni odri – Zahtevane lastnosti in projektiranje
Falsework - Performance requirements and general design
Traggerüste - Anforderungen, Bemessung und Entwurf
Etaiements - Exigences de performance et méthodes de conception et calculs
Ta slovenski standard je istoveten z: EN 12812:2004
ICS:
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 12812
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2004
ICS 91.220
English version
Falsework - Performance requirements and general design
Etaiements - Exigences de performance et méthodes de Traggerüste - Anforderungen, Bemessung und Entwurf
conception et calculs
This European Standard was approved by CEN on 10 December 2003.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12812:2004: E
worldwide for CEN national Members.

Contents Page
1 Scope. 5
2 Normative references. 5
3 Terms and definitions. 6
4 Design classes. 7
4.1 General. 7
4.2 Design class A. 7
4.3 Design class B. 8
5 Materials. 8
5.1 General. 8
5.2 Basic requirements for materials . 8
5.3 Weldability. 8
6 Brief. 9
7 Design requirements. 9
7.1 General. 9
7.2 Thickness of material . 9
7.3 Connections. 10
7.4 Flexibility of prefabricated support towers . 10
7.5 Foundation. 11
7.6 Towers providing support. 13
8 Actions. 13
8.1 General. 13
8.2 Direct actions. 14
8.3 Indirect actions "Q ". 17
8.4 Load combinations. 18
9 Structural design. 19
9.1 Technical documentation. 19
9.2 Structural design. 20
9.3 Imperfections and boundary conditions . 24
9.4 Calculation of internal forces . 30
9.5 Characteristic values of resistance and friction values. 38
Annex A (informative) Relation with site activities . 40

Foreword
This document (EN 12812:2004) has been prepared by Technical Committee CEN/TC 53 “Temporary
works equipment”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2004, and conflicting national standards
shall be withdrawn at the latest by December 2004.
No other international organisation has been involved.
This European Standard is one of a package of standards that includes also EN 12810-1,EN 12810-2,
EN 12811-1, EN 12811-2, EN 12811-3, EN 12813.

This European Standard does not replace any other European Standard.
This European Standard was prepared as part of a group, see above. It gives some information about
products covered by:
 scaffold tube in accordance with EN 39;
 scaffold couplers in accordance with EN 74;
 adjustable telescopic props in accordance with EN 1065.
The standard is not mandated. However cognisance of two European Directives should be taken.
These are:
Council Directives 89/391/EEC and 92/57/EEC.
The Annexes A and B are informative.
This document includes a bibliography
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia,
Spain, Sweden, Switzerland and United Kingdom.

Introduction
Most falsework is used:
 to carry the loads due to freshly poured concrete for structures until these structures have
reached a sufficient load bearing capacity;
 to absorb the loads from structural members, plant and equipment which arise during the erection,
maintenance, alteration or removal of buildings or other structures;
 additionally, to provide support for the temporary storage of building materials, structural
members and equipment.
This European Standard gives performance requirements for those who specify and use falsework
and gives methods to design falsework to meet those requirements. Clause 9 provides design
methods. It legitimizes simplified design methods for falsework made of tube and couplers already
successfully in use. The information on structural design is supplementary to the relevant structural
Eurocodes.
The standard describes different design classes. This allows the designer to choose between more or
less complex design methods, while achieving the same level of structural safety.
Because European Standards for materials do not exist to support the standard fully, it has been
prepared permitting equivalent national standards to be used. Publication of a European Standard
always results in the withdrawal of equivalent national standards.
Provision for specific personal safety matters is dealt with in EN 12811-1:2003 and other documents.
1 Scope
This European Standard specifies performance requirements and limit state design methods for two
design classes of falsework.
It sets out the rules that a designer has to take into account to produce a safe falsework structure.
It also provides information for the person who requires falsework to support a "permanent structure"
and who needs to commission its design or supply.
This European Standard also gives information on foundations.
This European Standard does not specify requirements for formwork, although formwork may be a
part of the falsework construction. Nor does it provide information on access and working scaffolds,
which is given in EN 12811-1:2003.
This European Standard does not provide information about site activities. It does not provide
information about the use of some standardized products, including beams conforming to EN 13377
and props conforming to EN 1065.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
EN 74, Couplers, loose spigots and base-plates for use in working scaffolds and falsework made of
steel tubes — Requirements and test procedures.
EN 1065:1998, Adjustable telescopic steel props — Product specifications, design and assessment
by calculation and tests.
EN 1990, Eurocode — Basis of structural design.
ENV 1991 (all parts including EN 1991-1-1, EN 1991-1-2, prEN 1991-1-3 and prEN 1991-2),
Eurocode 1 — Basis of design and actions on structures.
ENV 1992 (all parts), Eurocode 2 — Design of concrete structures.
ENV 1993 (all parts), Eurocode 3 — Design of steel structures.
ENV 1994 (all parts), Eurocode 4 — Design of composite steel and concrete structures.
ENV 1995 (all parts), Eurocode 5 — Design of timber structures.
ENV 1996 (all parts), Eurocode 6 — Design of masonry structures.
ENV 1997 (all parts), Eurocode 7 — Geotechnical design.
ENV 1998 (all parts), Eurocode 8 — Design provisions for earthquake resistance of structures.
ENV 1999 (all parts), Eurocode 9 — Design of aluminium structures.
rEN 12811-1:2003, Scaffolds — Performance requirements and general design.
EN 12811-3:2002, Temporary works equipment — Part 3: Load testing.
EN 12813, Load bearing towers of prefabricated elements — Methods of particular design and
assessment.
EN 12810-1:2003, Facade scaffolds made of prefabricated components — Part 1: Product
specification.
DIN 18218, Pressure of fresh concrete on vertical formwork.
C E Clear and T A Harrison. Concrete pressure on formwork. CIRIA Report No. 108.London
Construction Industry Resarch and Information Association
Manual de Technologie: Coffrage; CIB-FIB-CEB 27-98-83.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions in ENV 1993-1 and the
following apply.
3.1
brace
component connecting two points of a structure to help stiffen it
3.2
design class
class that defines the extent of design for falsework
3.3
falsework
temporary support for a part of a structure while it is not self-supporting and for associated service
loads
3.4
formwork
part of temporary works used to give the required shape and support to in-situ concrete
3.5
foundation
sub-structure needed to transmit loads into the ground
3.6
kentledge
material placed on a structure to provide stability by the action of its dead weight
3.7 imperfections
3.7.1
imperfection
divergence from the theoretical when erected ready for use
3.7.2
bow imperfection
initial out of true before loading
NOTE A bow imperfection can occur both in an individual member and in the complete tower or modular
beam assembly. It arises because the member is not straight, is manufactured not straight or members are
assembled out of alignment.
3.7.3
sway imperfection
out of true before loading in an erected structure, measured as
...