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1、- - - - - - - - - - - - - - - - - - BRITISH STANDARD BS 6579-1: 1988 (Reprinted, Incorporating Amendment No. 1) Safety fences and barriers for highways Part 1: Specification for components for tensioned corrugated beam safety fence on Z posts UDC 625.738 + 692.88 BS 6579-1:1988 This British Standard
2、, having been prepared 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 04-1999 First published October 1985 First revision September 1988 The following BSI references relate to the w
3、ork on this standard: Committee reference RDB/18 Draft for comment87/13411 DC ISBN 0 580 16790 9 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 f
4、ollowing bodies were represented: Aluminium Federation Association of Consulting Engineers British Cement Association British Railways Board British Steel Industry Convention of Scottish Local Authorities County Surveyors Society Department of Transport Institution of British Engineers Institution o
5、f Civil Engineers Institution of Highways and Transportation Royal 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 Laborato
6、ry) Fencing Contractors Association Amendments issued since publication Amd. No.Date of issueComments 6152January 1989Indicated by a sideline in the margin BS 6579-1:1988 BSI 04-1999i Contents Page Committees responsibleInside front cover Forewordii 0Introduction1 1Scope1 2Definitions2 3Components2
7、4Tolerances3 5Protective finish3 6Marking3 Appendix A Vehicle safety fences and barriers for highways: type characteristics4 Appendix B Transition between safety fences, bridge parapets and other types of safety fence6 Appendix C Schedule of components for 1 km of fence6 Appendix D Information to be
8、 supplied6 Appendix E Transport, handling and storage7 Appendix F Post extensions7 Figure 1 General arrangement of TCB fence10 Figure 2 Intermediate post and beam assembly11 Figure 3 Details of anchorages and posts12 Figure 4 Full height anchorages13 Figure 5 Profile and hole positions for corrugate
9、d beams14 Figure 6 Diagrammatical representation of fences and barriers15 Figure 7 TCB safety fence connection to steel parapet16 Figure 8 TCB safety fence connection to BACO (BACO Contracts Ltd.) parapet (preferred method)17 Figure 9 TCB safety fence connection to BACO (BACO Contracts Ltd.) parapet
10、 (alternative A)18 Figure 10 TCB safety fence connection to BACO (BACO Contracts Ltd.) parapet (alternative B)19 Figure 11 TCB safety fence connection to AHDE (Alcan High Duty Extrusions Ltd.) parapet (preferred method)20 Figure 12 TCB safety fence connection to AHDE (Alcan High Duty Extrusions Ltd.
11、) parapet (alternative A)21 Figure 13 TCB safety fence connection to AHDE (Alcan High Duty Extrusions Ltd.) parapet (alternative B)22 Figure 14 Conditions for use of post extensions or new posts related to overlay thickness23 Figure 15 TCB safety fence post extensions (central reserve)24 Figure 16 T
12、CB safety fence post extensions (verge)25 Table 1 Type characteristics4 Table 2 Components for 1 km of fence8 Publications referred toInside back cover BS 6579-1:1988 ii BSI 04-1999 Foreword This Part of BS 6579 has been prepared under the direction of the Road Engineering Standards Committee and it
13、 supersedes BS 6579-1:1985, which is withdrawn. This edition of this Part of BS 6579 differs from the previous one in that additional information on post extensions has been included. The other Parts of BS 6579 either published or in preparation are: Part 2: Specification for tensioned corrugated be
14、am safety fence on offset brackets; Part 3: Specification for components for tensioned rectangular hollow section beam (100 mm 100 mm) safety fence; Part 4: Specification for tensioned rectangular hollow section beam (200 mm 100 mm) safety fence; Part 5: Specification for open box beam safety fence
15、(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. BS 6579 is being produced at the request of users and manufacturers in order
16、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 United Kingdom. The designs are based on the results of static and dynamic tests carried out in the past on components and complete sys
17、tems under the direction of the Transport and Road Research Laboratory (TRRL). The safety barrier in Part 8 is for use only on certain roads at the date of publication of this Part of BS 6579. If further types are developed, BS 6579 will be revised and increased in scope to cover additions and varia
18、tions. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document com
19、prises a front cover, an inside front cover, pages i and ii, pages 1 to 26, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 6579-1:1988 BSI
20、 04-19991 0 Introduction 0.1 The objective of providing safety fences and safety barriers adjacent to or in the central reserve of a highway is to reduce the consequences of vehicles leaving the highway and entering an area where it would be unsafe for them to travel. It is emphasized that in practi
21、ce the range of vehicle characteristics and of conditions of impact with a safety fence are such that some variability in response, particularly by the impacting vehicle, is inevitable. Safety fences are intended to absorb some of the energy of impact and to redirect the errant vehicle, so that it f
22、ollows, within a narrow angle, the line of the fence in the direction of the traffic and does not overturn. Safety 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 o
23、f traffic. 0.2 The safety fences and barriers for ground mounting which are the subject of BS 6579 are for use 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
24、, there are some cases where the definition is applicable only to a particular Part of BS 6579 and does not apply 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, b
25、ut information pertaining to general characteristics of different types of safety fences and barriers is given in Appendix A. 0.4 There are various situations and various methods by which transition between a safety fence or safety barrier and a vehicle containment parapet can be assured without imp
26、airing the overall protection afforded to the users of the highway. Where it is not appropriate to make a direct connection to a bridge parapet, transition to an open box beam fence should be made using a special transition piece. NOTEDetails of a special transition piece are given in Figure 5 of BS
27、 6579-5:1986. Appendix B gives recommendations on methods of connecting safety fences to bridge parapets and other types of safety fence. In Appendix C the number of components is given for 1 km of safety fence. 0.5 It is important to recognize that the performance of a safety fence can be affected
28、by factors that are not covered by the specifications for the components. These factors include the 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 com
29、pleted. 0.6 Figure 1 illustrates the general arrangement of a tensioned corrugated beam 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 post
30、s (see Figure 2) however are expected to be either driven securely, or set in concrete into the ground, or mounted on bridge decks using “bridge deck posts” as shown in Figure 3. Where a tensioned corrugated beam fence is not continued over a bridge, the full height anchorages shown in Figure 4 shou
31、ld be used. These should be set in concrete and located adjacent to 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 Headquarters1) or
32、 Regional Offices of the Department. 0.8 Appendix D gives information that should be provided when making an enquiry or order. In Appendix E important recommendations are given on the transport, handling and storage of components prior to assembly on site. 0.9 Appendix F provides guidance on action
33、to take in order to restore the height of the safety fence following raising of the surface of the carriageway, e.g. as a result of resurfacing. 1 Scope This Part of BS 6579 specifies requirements for the components to be used in the construction of the tensioned corrugated beam (TCB) type of safety
34、 fence supported on Z posts. Requirements are given for the materials and dimensions of the components and for protective finishes. This Part of BS 6579 does not cover erection and tensioning of the assembled fence (see clause 0). NOTEThe titles of the publications referred to in this standard are l
35、isted on the inside back cover. 1) Department of Transport, St Christopher House, Southwark Street. London SE1 0ET. BS 6579-1:1988 2 BSI 04-1999 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 use
36、rs of the highway consisting of horizontal beams mounted on posts 2.2 safety 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 mo
37、unting posts nearest to the traffic 2.4 double sided safety fence a safety fence 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 a safety fence or barrier that is nea
38、rer to the vehicular traffic flow 2.6 impacting vehicle a vehicle striking a safety fence or barrier whether or not it is redirected 2.7 terminal the end-section of the length of a safety fence within which the connection to another safety fence or parapet is made 2.8 flaring (of the ends) the setti
39、ng back of ground anchorages behind the line of a safety fence NOTEFlaring is 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 anchorage frame extending to t
40、he full height of a safety fence NOTEFull height anchorages are used in locations where 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),
41、 when lap bolt clearances have been taken up but before beam to post connections are tightened 2.11 adjuster assembly a device for tensioning safety fences and adjusting the verticality of end posts 3 Components 3.1 Beams Adjuster beams, angled beams and standard beams shall be formed from steel, co
42、mplying with BS 1449-1, type BHR, grade 43/25. All beams shall have the profile shown in Figure 5 and shall comply with the appropriate dimensional requirements given in Figure 2. NOTEThis form of angled beam is under review. 3.2 Posts and anchorages 3.2.1 All posts and anchorages shall be made from
43、 steel complying with BS 4360 and to the following grades: a) end posts: sections grade 43C, plates grade 43A; b) other posts: grade 43A; c) full height anchorages: sections grade 43C, plates and angles grade 43 A. 3.2.2 Posts and anchorages shall comply with the dimensions shown in Figure 3 and Fig
44、ure 4, respectively. 3.3 Adjuster brackets Adjuster brackets shall be made from either: a) cast steel complying with BS 3100, grade A2 or A3; or b) spheroidal graphite cast iron complying with BS 2789 modified to provide a minimum tensile strength of 495 N/mm2 with a minimum elongation of 12 % or c)
45、 steel complying with BS 4360, grade 43A (ends may be forged). 3.4 Fasteners Bolts, nuts and washers shall be manufactured in steel as follows. a) Bolts shall be ISO metric black hexagon type, either complying with BS 4190, grade 4.6 or as specified on the drawings. b) Nuts shall be ISO metric black
46、 hexagon nuts, complying with BS 4190, grade 4. BS 6579-1:1988 BSI 04-19993 c) Washers shall be black complying with BS 4320, form E, F or G (see Table 2). Taper washers for converging anchorages shall normally have a taper of not less than 8 but the taper will vary with the differing angle between
47、convergent beams. 3.5 Reinforcing rings and tie bars Reinforcement for use in concrete foundation shall be made from 10 mm diameter steel rod, complying with BS 4449, grade 250. 3.6 Connecting straps For double sided fences, steel straps fabricated from steel grade 43A complying with BS 4360 shall b
48、e fitted in pairs at all beam lap joints in such a way as to connect both sides of the fence. 4 Tolerances 4.1 Tolerances on dimensions of components shall be in accordance with the information given on the relevant figure of this Part of BS 6579. 4.2 Deviation from the specified dimensions for mate
49、rials 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 with BS 729, after fabrication. NOTEWhere the purchaser wishes the components to be painted by the su