SIST EN 12629-7:2004+A1:2010
(Main)Machines for the manufacture of constructional products from concrete and calcium-silicate - Safety - Part 7: Stationary and mobile equipment for long line manufacture of prestressed products
Machines for the manufacture of constructional products from concrete and calcium-silicate - Safety - Part 7: Stationary and mobile equipment for long line manufacture of prestressed products
This part of EN 12629, taken together with EN 12629-1:2000+A1:2010 applies to stationary and mobile equipment for the benched manufacture of prestressed products. The manufacturing bed is a machine with which other associated machines work simultaneously. Moreover, these machines are generally used on beds installed in parallel. EN 12629-1:2000+A1:2010 specifies general requirements applicable to machines for the manufacture of constructional products from concrete and calcium-silicate. This document specifies the additional requirements to and/or the deviations from EN 12629-1:2000+A1:2010 specific to the machines it covers. This standard gives particular requirements for the design of the following machines: - Pre-stressing bed (schematic representation is given in annex A); - Bed sweeper, vacuum cleaner, oiler, wire-guide machine (schematic representation is given in annex B); - Bed layout machine (schematic representation is given in annex C); - Strand pushing/pulling machine (schematic representation is given in annex D); - Spinner, extruder, vibrodistributor (schematic representation is given in annex E); - Tarpaulin paying out and winding in machine (schematic representation is given in annex F); - Sawing machine (schematic representation is given in annex G). The concrete supply interface which is taken into account for safety is also considered. The sequence of these operations can be different according to the manufacturing process used in the factory and to the various types of products. The handling of the cut wires and their placement on beds is not covered by the present standard. This European Standard deals with all significant hazards pertinent to these machines, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4). This European Standard specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards. Sub-clause 1.3 of EN 12629-1:2000+A1:2010 applies. This document is applicable to equipment for long-line manufacture of pre-stressed product which are manufactured after the date of publication of this document by CEN.
Maschinen für die Herstellung von Bauprodukten aus Beton und Kalksandsteinmassen - Sicherheit - Teil 7: Stationäre und fahrbare Einrichtungen für die Herstellung von Spannbetonelementen
Diese Europäische Norm gilt für Einrichtungen zur Herstellung von Spannbeton, die sich aus stationären und fahrbaren Ausrüstungen zusammensetzen, um Produkte herzustellen, wie z.B.: - Abfangträger, Tragbalken und Brückenträger etc.; - Stürze; - Bodenplatten; - gerippte Böden; - Träger für Frei- leitungen; - Lichtmaste; - Schwellen; - Hohlkernplatten.
Machines pour la fabrication de produits de construction en béton et silico-calcaire - Sécurité - Partie 7: Equipements fixes et mobiles pour la fabrication sur bancs de produits en béton précontraint
La présente partie de l'EN 12629, utilisée avec l'EN 12629-1:2000+A1:2010, s'applique aux équipements
fixes et mobiles pour la fabrication sur bancs de produits en béton précontraint. Le banc de fabrication est une
machine avec laquelle d'autres machines associées fonctionnent simultanément. En outre, ces machines sont
généralement utilisées sur des bancs parallèles.
L'EN 12629-1:2000+A1:2010 spécifie les prescriptions générales applicables aux machines pour la fabrication
de produits de construction en béton et silico-calcaire.
Le présent document spécifie les prescriptions supplémentaires et/ou les dérogations à l’EN 12629-1:2000+A1:2010
spécifiques aux machines concernées."
1.2 La présente norme fournit des exigences particulières relatives à la conception des machines suivantes :
— Banc de précontrainte (représentation schématique donnée à l’Annexe A) ;
— Balayeuse de banc, aspirateur, huileuse, machine à guider les fils (représentation schématique donnée
à l’Annexe B) ;
— Machine à tracer les bancs (représentation schématique donnée à l’Annexe C) ;
— Machine à pousser/tirer les torons ou les fils représentation schématique donnée à l’Annexe D) ;
— Fileuse, extrudeuse, vibrodistributrice (représentation schématique donnée à l’Annexe E) ;
— Machine à dérouler et enrouler les bâches (représentation schématique donnée à l’Annexe F) ;
— Machine à scier (représentation schématique donnée à l’Annexe G).
NOTE La fabrication comprend tout ou partie des opérations suivantes :
— traitement du banc de précontrainte avec un produit de démoulage ;
— traçage des produits (dalles, pré-dalles, etc.) à réaliser ;
— mise en place des torons ou des fils de précontrainte ;
— mise en pré-tension ;
— installation des coffrages (réservations, jouées, intercalaires et inserts) ;
— fixation des armatures ;
Stroji za izdelavo gradbenih proizvodov iz betona in apnenega peščenca - Varnost - 7. del: Nepremična in premična oprema za izdelavo elementov iz prednapetega betona
Ta del EN 12629 skupaj z EN 12629-1:2000+A1:2010 velja za nepremično in premično opremo za izdelavo elementov iz prednapetega betona na delovni mizi. Proizvodni podstavek je stroj, ki hkrati deluje z drugimi povezanimi stroji. Poleg tega se ti stroji v splošnem uporabljajo na vzporedno nameščenih podstavkih. EN 12629-1:2000+A1:2010 določa splošne zahteve, ki veljajo za stroje za izdelavo gradbenih proizvodov iz betona in apnenega peščenca. Ta dokument določa dodatne zahteve in/ali odstopanja od EN 12629-1:2000+A1:2010, specifične za stroje, ki jih zajema. Ta standard navaja posebne zahteve za načrtovanje naslednjih strojev: - podstavek za prednapenjanje (shematski prikaz je podan v Dodatku A); - pometač podstavka, sesalnik, oljnik, stroj za vodenje žice (shematski prikaz je podan v Dodatku B); - stroj za načrtovanje podstavka (shematski prikaz je podan v Dodatku C); - stroj za potiskanje/vlečenje niti (shematski prikaz je podan v Dodatku D); - centrifuga, ekstruder, vibracijski razdeljevalnik (shematski prikaz je podan v Dodatku E); - stroj za razvijanje in navijanje ponjave (shematski prikaz je podan v Dodatku F); - šivalni stroj (shematski prikaz je podan v Dodatku G). Obravnavan je tudi vmesnik za dovajanje betona, ki se upošteva pri varnosti. Zaporedje operacij se lahko razlikuje glede na postopek izdelave, ki se uporablja v tovarni, in glede na različne vrste proizvodov. Pričujoči standard ne zajema dela z narezanimi žicami in njihove namestitve na podstavke. Ta evropski standard obravnava vse pomembne nevarnosti, ki se nanašajo na te stroje, kadar se uporabljajo kot predvideno in pod pogoji napačne uporabe, ki jih razumno predvidi proizvajalec (glej Klavzulo 4). Ta evropski standard določa primerne tehnične ukrepe za odpravo ali zmanjšanje tveganj, ki se pojavijo zaradi pomembnih nevarnosti. Velja podklavzula 1.3 EN 12629-1:2000+A1:2010. Ta dokument velja za opremo za izdelavo elementov iz prednapetega betona, izdelano po datumu, ko je CEN objavil ta dokument.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SUHGQDSHWHJDEHWRQDMaschinen für die Herstellung von Bauprodukten aus Beton und Kalksandsteinmassen - Sicherheit - Teil 7: Stationäre und fahrbare Einrichtungen für die Herstellung von SpannbetonelementenMachines pour la fabrication de produits de construction en béton et silico-calcaire - Sécurité - Partie 7: Equipements fixes et mobiles pour la fabrication sur bancs de produits en béton précontraintMachines for the manufacture of constructional products from concrete and calcium-silicate - Safety - Part 7: Stationary and mobile equipment for long line manufacture of prestressed products91.220Gradbena opremaConstruction equipmentICS:Ta slovenski standard je istoveten z:EN 12629-7:2004+A1:2010SIST EN 12629-7:2004+A1:2010en,fr01-december-2010SIST EN 12629-7:2004+A1:2010SLOVENSKI
STANDARD
SIST EN 12629-7:2004+A1:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12629-7:2004+A1
September 2010 ICS 91.220 Supersedes EN 12629-7:2004English Version
Machines for the manufacture of constructional products from concrete and calcium-silicate - Safety - Part 7: Stationary and mobile equipment for long line manufacture of prestressed products
Machines pour la fabrication de produits de construction en béton et silico-calcaire - Sécurité - Partie 7: Equipements fixes et mobiles pour la fabrication sur bancs de produits en béton précontraint
Maschinen für die Herstellung von Bauprodukten aus Beton und Kalksandsteinmassen - Sicherheit - Teil 7: Stationäre und fahrbare Einrichtungen für die Herstellung von Spannbetonelementen This European Standard was approved by CEN on 3 November 2003 and includes Amendment 1 approved by CEN on 5 August 2010.
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 CEN Management Centre 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 CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12629-7:2004+A1:2010: ESIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 2 Contents page Foreword . 3Introduction . 41Scope . 52Normative references . 63Terms and definitions. 73.1Products . 73.2Equipment . 84List of significant hazards . 115!!!!Safety requirements and/or protective measures"""" . 265.1General . 265.2Layout - Circulation - Means of access . 275.3Control of the machines, modes of operation . 275.4Safety of machines and working equipment - General . 275.5Noise and vibration . 285.6Additional requirements for specific machines and equipment . 285.7Summary of the safety measures given in relation to the significant hazards listed in clause 4346!!!!Verification of safety requirements and/or protective measures"""" . 657Information for use – Instruction handbook . 667.1Introduction . 667.2General information . 667.3Minimum recommendations for use of the machines . 678Marking . 68Annex A (informative)
Pre-stressing bed . 69Annex B (informative)
Bed sweeper, vacuum cleaner, oiler, wire-guide machine . 74Annex C (informative)
Bed layout machine . 76Annex D (informative)
Strand pushing/pulling machine . 78Annex E (informative)
Spinner, extruder, vibrodistributor . 80Annex F (informative)
Tarpaulin paying out and winding in machine . 82Annex G (informative)
Sawing machine . 84Annex H (informative)
Trilingual list of terms relative to pre-stressing manufacturing products and equipment . 86Annex ZA (informative)
!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC"""" . 88
SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 3 Foreword This document (EN 12629-7:2004+A1:2010) has been prepared by Technical Committee CEN/TC 151 “Construction equipment and building material machines — Safety”, 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 March 2011, and conflicting national standards shall be withdrawn at the latest by March 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1, approved by CEN on 2010-08-05. This document supersedes EN 12629-7:2004. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. !deleted text" !The series "Machines for the manufacture of constructional products from concrete and calcium – silicate – Safety" consists of following parts: Part 1: Common requirements Part 2: Block making machines Part 3: Slide and turntable machines Part 4: Concrete rooftile making machines Part 5.1: Concrete pipe machines manufacturing in the vertical axis Part 5.2: Concrete pipe machines manufacturing in the horizontal axis Part 5.3: Pipe prestressing machines Part 5.4: Concrete pipe coating machines Part 6: Stationary and mobile equipment for the manufacture of precast reinforced products Part 7: Stationary and mobile equipment for the benched manufacture of prestressed products Part 8: Machines and equipment for the manufacture of constructional products from calcium silicate (and concrete)." !deleted text" According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 4 Introduction This European Standard is a Type C standard as stated in !EN ISO 12100". The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this European Standard. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. This European Standard specifies the additional requirements to and/or the deviations from
!EN 12629-1:2000+A1:2010" specific for the Stationary and mobile equipment for long line manufacture of pre-stressed products as defined in clause 3.
With the aim of clarifying the intentions of the standard it should be noticed that the following assumptions where made when producing it: specific conditions of use or environmental conditions out of the scope of the standard shall be the subject of negotiations between the manufacturer and the user/owner; the equipment will only be used by competent and designated persons; the place of use/installation is adequately lit; All operations are carried out by specially trained operators. SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 5 1 Scope 1.1 .!This part of EN 12629, taken together with EN 12629-1:2000+A1:2010 applies to stationary and mobile equipment for the benched manufacture of prestressed products. The manufacturing bed is a machine with which other associated machines work simultaneously. Moreover, these machines are generally used on beds installed in parallel. EN 12629-1:2000+A1:2010 specifies general requirements applicable to machines for the manufacture of constructional products from concrete and calcium–silicate. This document specifies the additional requirements to and/or the deviations from EN 12629-1:2000+A1:2010 specific to the machines it covers." 1.2 This standard gives particular requirements for the design of the following machines: Pre-stressing bed (schematic representation is given in annex A); Bed sweeper, vacuum cleaner, oiler, wire-guide machine (schematic representation is given in annex B); Bed layout machine (schematic representation is given in annex C); Strand pushing/pulling machine (schematic representation is given in annex D); Spinner, extruder, vibrodistributor (schematic representation is given in annex E); Tarpaulin paying out and winding in machine (schematic representation is given in annex F); Sawing machine (schematic representation is given in annex G). NOTE The manufacturing operations include some or all of the following: treating pre-stressing bed with release agent; "marking out" the elements (slabs, plain slabs, etc.) to be made; running the pre-stressing strands; pre-tensioning; installing the shutterings, (formwork, side shutters, end plates and inserts) fixing reinforcement; tensioning; concrete distribution and compaction; winding out the tarpaulin; heating; detensioning; removal of shettering, formwork, etc. ; strands cutting or sawing; removal of final products; bed cleaning. The concrete supply interface which is taken into account for safety is also considered. The sequence of these operations can be different according to the manufacturing process used in the factory and to the various types of products. !The handling of the cut wires and their placement on beds is not covered by the present standard." SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 6 1.3 !This European Standard deals with all significant hazards pertinent to these machines, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4). This European Standard specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards." 1.4 Sub-clause 1.3 of !EN 12629-1:2000+A1:2010"applies. !deleted text" ! 1.5 "This document is applicable to equipment for long-line manufacture of pre-stressed product which are manufactured after the date of publication of this document by CEN. 2 Normative references !The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 349:1993+A1:2008, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body EN 457, Safety of machinery — Auditory danger signals — General requirements, design and testing (ISO 7731:1986, modified) EN 842, Safety of machinery —Visual danger signals — General requirements, design and testing EN 953:1997+A1:2009, Safety of machinery — Guards — General requirements for the design and construction of fixed and movable guards EN 954-1:1996, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design EN 982, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics EN 1050:1996, Safety of machinery — Principles for risk assessment EN 1088, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection EN 1093 (all parts), Safety of machinery — Evaluation of the emission of airborne hazardous substances EN 1760-2, Safety of machinery — Pressure sensitive protective devices — Part 2: General principles for the design and testing of pressure sensitive edges and pressure sensitive bars EN 13862:2001+A1:2009, Floor cutting-off machines — Safety EN 12629-1:2000+A1:2010, Machines for the manufacture of constructional products from concrete and calcium-silicate — Safety — Part 1: Common requirements EN 60204-1, Safety of machinery - Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN ISO 3457, Earth-moving machinery — Guards — Definitions and requirements (ISO 3457:2003) EN ISO 7731:2008, Ergonomics — Danger signals for public and work areas — Auditory danger signals (ISO 7731:2003) SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 7 EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and lower limbs (ISO 13857:2008) EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003) EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principles (ISO 12100-2:2003) EN ISO 13732-1:2008, Ergonomics of the thermal environment — Methods for the assessment of human responses to contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006) EN ISO 14122-1:2001, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed means of access between two levels (ISO 14122-1:2001) EN ISO 14122-2:2001, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms and gangways (ISO 14122-2:2001) EN ISO 14122-3:2001, Safety of machinery — Permanent means of access to machinery — Part 3: Stairways, stepladders and guard-rails (ISO 14122-3:2001) EN ISO 14122-4:2004, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO 14122-4:2004)" 3 Terms and definitions !For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003,
EN 12629-1:2000+A1:2010 and the following apply." 3.1 Products 3.1.1 hollow core flooring slab pre-stressed slabs incorporating longitudinal hole used in the construction of floors. They are considered as structural elements 3.1.2 beam pre-stressed concrete element used in building or bridge structures. It has a supporting function; their section can be that of an I, T, Y, U, Π, a rectangle, a trapezium, etc. 3.1.3 joist pre-stressed concrete element forming the supporting part of complex flooring. Its inverted T-shape section provides a support for inflll blocks or slabs and in-situ concrete screed (compression slab) 3.1.4 lintel part constructed of pre-stressed concrete, prismatic in shape with a generally rectangular section. It forms the top part of openings in walls and ensure support for masonry mounted above 3.1.5 plain slab thin pre-stressed concrete elements designed to form the reinforced section of complex flooring. The compression slab is cast in situ 3.1.6 transmission line pole pre-stressed concrete post designed to support overhead electric energy or communication cables SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 8 3.1.7 lighting column rectilinear pre-stressed concrete post, designed to support public lighting (streets, parks, sports grounds, etc.) 3.1.8 railway sleeper trapezium-shaped element of pre-stressed concrete designed to support the rails and maintain them at the required gauge 3.2 Equipment NOTE There is no customary term for the machines dealt with in this standard. The term featured in the title is merely one of the more frequent terms, but other equivalent terms may be encountered, each combining the words in the following lists in a variety of ways: production
machines for the long line manufacture of pre-stressed hollow core flooring slab manufacturing workshop plain slabs
Hall floor joists In addition, annex H (informative) gives a trilingual list of terms relative to pre-stressing manufacturing products and equipment. 3.2.1 pre-stressing bed
3.2.1.1 pre-stressing bed for flat products installation composed of two solid anchor blocks, and a slab connecting the two anchor blocs. The bed may incorporate a steel plate soffit on which concrete products (pre-slabs, joists, hollow slabs) are cast. At the ends of the bed, the blocks are provided with posts and anchor plates (abutment). Jacking devices allow tensioning and detensioning of wires or strands. NOTE 1 The length of the slab is generally between 40 m and 150 m and the width is between 1,20 m and 2,40 m.
NOTE 2 The pre-stressing bed used for the manufacture of flat products is usually completed by rails arranged on both sides of the slab. The rails are intended to guide mobile machines." 3.2.1.2 pre-stressing bed for beam type products
installation composed of two solid anchor blocks, a slab connecting the two anchor blocs and two walls, generally movable. At the ends of the bed, the blocks are provided with posts and anchor plates (abutment). Jacking devices allow tensioning and detensioning of wires or strands. NOTE 1 The length of the bed is generally between 80 m and 100 m and the width is between 0,50 m and 2 m.
NOTE 2 The beds may be single or double (parallel casting of two beams). 3.2.2 self stressing bed structure enclosing or supporting shutterings and simply resting on the ground or on suitable supports. The length of this structure is between several meters (depending on the manufactured products) and a maximum size compatible with the overall stability and the forces developed by the tension in the strands 3.2.3 heating equipment equipment intended to harden the products NOTE heating equipment includes: a type of energy sources from: electricity; "free" steam; steam or hot fluids in a closed circuit; hot air and a heating system from: heating soffits or heating elements under moulds or shuttering; electric heating cable integrated into the bed; SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 9 heated tarpaulin; heated shuttering or mould. 3.2.4 tensioning and tension relieving equipment 3.2.4.1 single strand tensioning equipment consisting of a jacking device and its associated hydraulic machine (which is generally mobile) which supplies the energy needed to tension the strands: wire or strands. The jacking device takes its support on the anchorage utilising a barrel and conical wedge ensuring the restraint of pre-stressed reinforcement. The strands are anchored on the anchorage abutment 3.2.4.2 multi-strand tensioning equipment allowing the simultaneous tensioning of all the strands on one bed. The anchor points in the transverse anchor are obtained by anchor grips or button-heads; the button-heads are made by cold forming the wire ends. The pre-stressing bed has a transverse anchor at either end. At one end, the transverse anchor is fixed and at the other is mobile and moved by hydraulic cylinders. A fixed hydraulic machine supplies the necessary energy. After tensioning, the cylinders are locked in position by a mechanical device (support, auger) so that they do not stay under pressure during the following operations 3.2.4.3 detensioning operation where, at first, the jacking devices are put under pressure slightly above the tensioning pressure to release the locking device (screw, support, etc.). Then, they act as a brake to release the tension in the strands (progressive release). In the case of wide beds or asymmetry in the forces in the strands, a guiding and balancing device can be set up 3.2.5 concrete casting machines 3.2.5.1 vibrodistributor independent mobile machine providing the uniform distribution of concrete (in general for the manufacture of plain slabs or joists) compacting and controlling the concrete thickness by means of vibration. Generally, vibrodistributors incorporate auxiliary systems that allow to carry out the roughness of the upper face for plain slabs 3.2.5.2 sheer compactor and extruder mobile automatic machine that distributes the concrete while forming (generally for the manufacture of hollow core flooring slabs and joists), compacting and finishing the product. These operations are generally carried out using the principle of a vibrating and sliding core. The machine can be moved under its own power (sheer compactor) or by reaction due to the thrust against the concrete applied during the feed (sheer compaction) 3.2.6 auxiliary machines 3.2.6.1 bed cleaning machine independent moving carriage assemblies, towed or self-propelled to ensure: the sweeping the soffit or moulds; the removal of hardened concrete; SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 10 the spraying of release agents onto the soffit or moulds. In some cases, they locate the pre-stressing strands. 3.2.6.2 marking out machine independent machine consisting of self-propelled mobile carriages designed to ensure the layout of product in terms of dimension and shape. Generally they are used for the manufacture of floor shuttering slabs 3.2.6.3 machine for laying and removing block ends independent towed or self-propelled mobile carriage machines to handle, store, install and remove inserts (also called combs) to install and remove them. These machines are used to manufacture the floor joist and plain slabs. They ensure their set up and their withdrawal 3.2.6.4 strand pulling machine self-propelled carriages, or machines propelled by other means, travelling sidewise or over the bed and, in their movements, pulling one or several strands in such a fashion as to cut them to length. The strands are available in coils. They are held in dispensers or turntables 3.2.6.5 strand pushing machine machine situated on the side of the beds and pushing each strand in a casing all along the beds, cutting them automatically to the desired length. When the desired number of strands has been cut, the casing opens and releases the strands on the side of the bed.
The strands are then pulled on the bed 3.2.6.6 strands setting up machine independent or towed mobile carriages used for positioning the pre-stressing strands on the bed. These strands are generally stored in coils or are pre-cut. Some similar machines can set down or fix the passive transverse reinforcement. This equipment is more specifically used in the manufacture of plain slabs 3.2.6.7 tarpaulin paying out machine independent or towed mobile carriage carrying a tarpaulin pay out drum. For movement in a given direction, the tarpaulin is rolled out over the product to be heated; for a movement in the opposite direction, it is wound in and thus uncovers the hardened products. These operations can be mechanised or manual 3.2.6.8 bed sawing machine independent or towed mobile carriage which includes a concrete or strand sawing. Depending upon its orientation, sawing can be longitudinal, transverse or angled. Some of the carriages can be programmed to automatically execute all the cuts for a bed 3.2.6.9 concrete vacuum machines independent or towed mobile carriage which includes a vacuum device to remove green concrete spillage
(between two products) SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 11 4 List of significant hazards This clause contains the hazards, hazardous situations, as far as they are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce risk. !deleted text" Annexes A to G (informative) illustrate examples of the following common machine types: pre-stressing bed, strands setting up machine, fixed or mobile tensioning equipment and self stressing bed; sweeper/vacuum machine/oiler; bed layout machine; strand pulling/pushing machine; sheer compactor, extruder, vibrodistributor; tarpaulin paying out and winding in machine; strand and concrete sawing machine. In accordance with clause 4 of !EN 12629-1:2000+A1:2010" the hazard zones described in the following tables are illustrated in annexes A to G. SIST EN 12629-7:2004+A1:2010
EN 12629-7:2004+A1:2010 (E) 12 Table 1 — Pre-stressing bed, strands setting up machine, fixed or mobile tensioning equipment and self stressing bed Ref Hazard according to annex A of EN 1050:1996 Localisation/scenario See Figures A.1 and A.3 1 Mechanical hazards 1.1 Crushing detensioning cylinders, jacking devices releasing 1 falling of the single wire stressing jack 3 1.2 Shearing between button-heads and transverse anchor (during pre-tensioning) 4 with the bed accessories (removable walls, mobile vibrator) 5 with the mobile part of the single wire stressing jack
during tensioning 6 1.3 Cutting sharp edges in beds and casing 7 1.4 Drawing-in or trapping
strands (wire or bundles) under tension (failure of the anchoring, slippage of the locking device) 8 by strands (wire or bundles) during setting up 9 1.5 Impact strands (wire or bundles) under tension (failure of the anchoring, slippage of the locking device) 8 by strands (wire or bundles) during setting up 9 chain or guard ejection due to rupture of strands (wire or bundles)
2 falling of the end bed mobile guard (mobile cover, shield, grid) 10 falling of accessories (combs, inserts, layout of product sides and ends) during mechanical or manual handling operations 8 rupture of a transverse anchor 4 1.6 Ejection of fluids under pressure hoses under hydraulic pressure, hot fluids of the hydraulic circuits, feeding of the cylinders for tensioning of reinforcements 11 steam pipes, valves: breaking, leakage 12 1.7 Ejection of parts chain or guard ejection due to rupture of strands (wire or bundles) 2 rupture of the pneumatic rope of the bed vibrator 13 1.8 Slip, trip and falling
oiled beds (walking on the beds after spraying of the releasing agents) 8 rails on both sides of the bed that constitute obstacles for the passage and falling from a height 14 machine ends, hydraulic pipes on the ground 14 falling into the tensioning hole 15 falling from/into the casing (assembly of the reinforcements, concrete smoothing…) 5 2 Electrical hazard 2.1 Elec
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