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1、- - - - - - - - - - - - - - - - - - BRITISH STANDARD BS 6579-3: 1988 Safety fences and barriers for highways Part 3: Specification for components for tensioned rectangular hollow section beam (100 mm I 100 mm) safety fence UDC 625.738 + 692.88 BS 6579-3:1988 This British Standard, having been prepar
2、ed under the direction of the Road Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1988 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference RDB/18 Draft for comment 86/13656 DC
3、ISBN 0 580 16438 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Road Engineering Standards Committee (RDB/-) to Technical Committee RDB/18, upon which the following bodies were represented: Aluminium Federation Association of Consulti
4、ng Engineers British Railways Board British Steel Industry Cement and Concrete Association Convention of Scottish Local Authorities County Surveyors Society Department of Transport (Highways) Institution of British Engineers Institution of Civil Engineers Institution of Highways and Transportation R
5、oyal Automobile Club Royal Society for the Prevention of Accidents The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Department of Transport (Transport and Road Research Laboratory) Fencing Contractors Association Amendments issued since pu
6、blication Amd. No.Date of issueComments BS 6579-3:1988 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii 0Introduction1 1Scope1 2Definitions2 3Components2 4Tolerances3 5Protective finish3 6Marking3 Appendix A Vehicle safety fences and barriers for highways: type characte
7、ristics4 Appendix B Transition between safety fences, bridge parapets and other types of safety fence6 Appendix C Schedule of components6 Appendix D Transport, handling and storage8 Appendix E Information to be supplied8 Figure 1 General arrangement of rectangular hollow section beam (100 mm I 100 m
8、m) safety fence, type TRHS19 Figure 2 Details of safety fence posts10 Figure 3 Expansion joint anchorages11 Figure 4 Details of beams, connector plates and turn-buckles12 Figure 5 Diagrammatical representation of fences and barriers13 Table 1 Vehicle safety fences and barriers for highways: type cha
9、racteristics4 Table 2 Components for 1 km of fence6 Publications referred toInside back cover BS 6579-3:1988 ii BSI 07-1999 Foreword This Part of BS 6579 has been prepared under the direction of the Road Engineering Standards Committee. The other Parts of BS 6579 either published or in preparation a
10、re: Part 1: Specification for components for tensioned corrugated beam safety fence on Z posts; Part 2: Specification for tensioned corrugated beam safety fence on offset brackets; Part 4: Specification for tensioned rectangular hollow section beam (200 mm I 100 mm) safety fence; Part 5: Specificati
11、on for open box beam safety fence (single height); Part 6: Specification for components for open box beam safety fence (double height); Part 7: Specification for untensioned corrugated beam safety fences; Part 8: Specification for concrete safety barriers. Appendix A and Appendix B provide additiona
12、l information helpful to the users of the components. BS 6579 is being produced at the request of users and manufacturers in order to cover the various types of safety fences and barriers available. Fences detailed in Parts 1 to 7 have been developed already and approved for use on roads in the Unit
13、ed Kingdom. The designs are based on the results of static and dynamic tests carried out in the past on components and complete systems under the direction of the Transport and Road Research Laboratory (TRRL). The safety barrier detailed in Part 8 is for use only on certain roads at the date of publ
14、ication of this British Standard. If further types are developed, BS 6579 will be revised and increased in scope to cover additions and variations. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
15、application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, an inside back cover and a back cover. This standard has been updated (see copyrigh
16、t date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 6579-3:1988 BSI 07-19991 0 Introduction 0.1 The objective of providing safety fences or barriers adjacent to a highway is to reduce the consequences of vehicles leaving the c
17、arriageway and entering areas where it would be unsafe for them to travel. Safety fences are intended to absorb some of the energy of impact and to redirect the errant vehicle, so that it follows, within a narrow angle, the line of the fence in the direction of the traffic and does not overturn. Saf
18、ety barriers are intended to provide containment without significant deflection or deformation under impact, and to redirect errant vehicles along the line of the barrier in the direction of traffic. 0.2 The safety fences and barriers for ground mounting which are the subject of BS 6579 are for use
19、in conjunction with parapets on bridges and other structures, which are the subject of BS 6779. Although definitions in both standards have been chosen so as to align as closely as possible, there are some cases where a definition is applicable only to a particular Part of BS 6579 and does not apply
20、 generally. 0.3 No direct guidance is given in BS 6579 on the situations where safety fences and barriers should be erected or on the choice of the types described in the various Parts, but information pertaining to general characteristics of different types of safety fences and barriers is given in
21、 Appendix A. 0.4 There are various situations and various methods by which transition between a safety fence or safety barrier and a bridge parapet can be assured without impairing the overall protection afforded to users of the highway. Appendix B gives recommendations on the method of connecting r
22、ectangular hollow section beam (100 mm I 100 mm) safety fences to bridge parapets and other types of safety fence. 0.5 It is important to recognize that the performance of a safety fence can be affected by factors that are not covered by the specifications for the components. These factors include t
23、he choice of intermediate posts to suit the ground conditions and the erection and maintenance of the fence. Tensioned fences are not complete until all tensioning procedures have been satisfactorily completed. 0.6 Figure 1 illustrates the general arrangement of a tensioned rectangular hollow sectio
24、n beam (100 mm I 100 mm) safety fence for which the components specified in this Part of BS 6579 are intended. It is essential that the end posts and all angled beam posts are set in concrete as illustrated in Figure 1. Intermediate posts (see Figure 1 and Figure 2), however, are either driven secur
25、ely, or set in concrete, into the ground or mounted on bridge decks using “bridge deck posts”. Where a tensioned rectangular hollow section beam fence is not continued over a bridge, the full height anchorages shown in Figure 3 should be used. These should be set in concrete and located adjacent to
26、the approach and departure ends of the bridge deck. 0.7 Enquiries concerning the availability of detailed drawings providing information on manufacture and installation should be made to the Department of Transport Head-quarters1) or Regional Offices of the Department. 0.8 Where a tensioned rectangu
27、lar hollow section beam safety fence is used on a curve the limiting radius of the installation should be not less than 120 m. 0.9 The approach to the safety fence should be set back away from the traffic and flared. The flare length should be at least ten times the set back. 0.10 Appendix C gives t
28、he number of components for 1 km of safety fence. 0.11 Appendix D gives important recommendations on the transport, handling and storage of components prior to assembly on site. 0.12 Appendix E lists information that should be provided when making an enquiry or order. 0.13 If for any reason the heig
29、ht of the safety fence above the adjacent carriageway is affected by the raising of the running surface, action should be taken to restore the height of the safety fence to the specified dimension. 1 Scope This Part of BS 6579 specifies requirements for the components to be used in the construction
30、of the tensioned rectangular hollow section beam (100 mm I 100 mm) safety fence, type TRHS1, supported on Z posts. Requirements are given for materials, dimensions, protective finishes and identification. 1) Department of Transport, EPP Division, St Christopher House, Southwark Street, London SE1 OT
31、E. BS 6579-3:1988 2 BSI 07-1999 This Part of BS 6579 does not cover erection and tensioning of the assembled fence (see clause 0). This Part of BS 6579 does not cover the use of rectangular hollow section beam (100 mm I 100 mm) safety fence for radii less than 120 m. NOTEThe titles of the publicatio
32、ns referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS 6579 the following definitions apply. 2.1 safety fence an installation provided for the protection of users of the highway consisting of horizontal beams mounted on posts 2.2 safety
33、 barrier an installation provided for the protection of users of the highway which is continuously in contact with its supporting foundation 2.3 single sided safety fence a safety fence having its beams on the side of the mounting posts nearest to the traffic 2.4 double sided safety fence a safety f
34、ence having the traffic face of its beams in front of, or in line with, the traffic faces of the supporting posts, with the traffic approaching on both sides 2.5 traffic face the face of the safety fence or barrier that is nearer to the vehicular traffic flow 2.6 impacting vehicle a vehicle striking
35、 a safety fence or barrier whether or not it is redirected 2.7 terminal that end-section of the length of a safety fence within which the beam rises from or is brought down to an anchorage 2.8 flaring (of the ends) the setting back of ground anchorages behind the line of a safety fence NOTEFlaring i
36、s intended to reduce the risk of errant vehicles hitting or mounting the anchorages and to reduce the risk of a vehicle passing behind the safety fence. 2.9 full height anchorage a cross-braced frame extending to the full height of a safety fence NOTEFull height anchorages are used in locations wher
37、e ground anchorages are not suitable. 2.10 initial installation length the length of safety fence, obtained by setting out the position of each intermediate post from the centre of the angled beam post (the datum), when lap bolt clearances have been taken up but before beam to post connections are t
38、ightened 2.11 adjuster assembly a device for tensioning safety fences and adjusting the verticality of end posts 3 Components 3.1 Beams (see Figure 4) Beams shall be formed from 100 mm I 100 mm I 5 mm hot rolled rectangular hollow sections that have dimensions complying with BS 4848-2 and that have
39、physical properties complying with grade 50C of BS 4360. 3.2 Posts and anchorages 3.2.1 Posts and anchorages shall be made from steel complying with the following grades of BS 4360: a) anchor posts: sections grade 43C, plates grade 43A; b) end posts: sections grade 43C, plates 43A; c) other posts: g
40、rade 43A; d) full height anchorages: hollow sections grade 43C, plates and other sections grade 43A. 3.2.2 Posts and anchorages shall have dimensions as shown in Figure 2 and Figure 3 respectively, and shall comply with the following specifications: a) rectangular hollow sections: BS 4848-2; b) angl
41、e sections: BS 4848-4; c) channel sections: BS 4. 3.3 Adjuster turn-buckles and nuts Adjuster turn-buckles and nuts shall be made from steel complying with grade 080M40 of BS 970-1 and shall have dimensions as given in Figure 4. 3.4 Connections 3.4.1 Connecting plates. Connecting plates shall be mad
42、e from steel complying with grade 43A of BS 4360 and shall have dimensions as shown in Figure 4. BS 6579-3:1988 BSI 07-19993 3.4.2 Connector covers. Connector covers shall be made from hot rolled rectangular hollow section that has dimensions complying with BS 4848-2 and as given in Figure 4, and th
43、at has physical properties complying with grade 43C of BS 4360. 3.4.3 Fasteners. Bolts, nuts and washers shall be made from steel and selected from the following as appropriate. a) Bolts and screws shall be ISO metric black hexagon type either complying with grade 4.6 of BS 4190 or as specified in A
44、ppendix C. b) Nuts shall be ISO metric black hexagon nuts either complying with grade 4 of BS 4190 or as specified in Appendix C. c) Washers shall be black complying with BS 4320, form E as in Appendix C. NOTEThe items listed in a), b) and c) are to be galvanized before use (see clause 5). 3.5 Reinf
45、orcing rings and tie bars Reinforcement for use in concrete foundations shall be made from 10 mm diameter steel rod complying with grade 250 of BS 4449. 4 Tolerances 4.1 Tolerances on dimensions of components shall be in accordance with the appropriate dimensional specification, detailed drawings an
46、d relevant figures of this Part of BS 6579. 4.2 Deviation from the specified dimensions for materials and fabricated components shall be measured before galvanizing. 5 Protective finish All steel components, excluding reinforcing rings and reinforcing bars, shall be hot dip galvanized, in accordance
47、 with BS 729, after fabrication. Fasteners shall be spun galvanized. NOTEWhere the purchaser wishes the components to be further protected by a paint system such requirements should be specified at the time of the enquiry and/or order. In this respect attention is drawn to BS5493. 6 Marking All beam
48、s, connectors, posts and anchorages shall be clearly marked with the following: a) the number of this British Standard, i.e. BS 65792); b) the manufacturers identification mark; c) digits indicating the month and year of manufacture. (Note for example 10/88 indicates manufacture during October 1988.
49、) 2) Marking BS 6579 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is