BS 6579-1-1988 Safety fences and barriers for highways - Specification for components for tensioned corrugated beam safety fence on Z posts《公路的安全栏杆和护栅 在Z支柱上的张紧式波纹梁安全栏杆的组件的规范》.pdf

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 UDC625.738+692.88BS6579-1:1988 This British Standard, having been prepared under the directio

2、nof the Road Engineering Standards Committee, was published under the authority of the Board of BSI and comes intoeffect on 30 September 1988 BSI 04-1999 First published October 1985 First revision September 1988 The following BSI references relate to the work on this standard: Committee reference R

3、DB/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 following bodies were represented: Aluminium

4、 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 of Civil Engineers Institution of Highways a

5、nd 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 Laboratory) Fencing Contractors Association Amendme

6、nts issued since publication Amd. No. Date of issue Comments 6152 January 1989 Indicated by a sideline in the marginBS6579-1:1988 BSI 04-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 2 3 Components 2 4 Tolerances 3 5 Protective fi

7、nish 3 6 Marking 3 Appendix A Vehicle safety fences and barriers for highways: type characteristics 4 Appendix B Transition between safety fences, bridge parapets and other types of safety fence 6 Appendix C Schedule of components for1km of fence 6 Appendix D Information to be supplied 6 Appendix E

8、Transport, handling and storage 7 Appendix F Post extensions 7 Figure 1 General arrangement of TCB fence 10 Figure 2 Intermediate post and beam assembly 11 Figure 3 Details of anchorages and posts 12 Figure 4 Full height anchorages 13 Figure 5 Profile and hole positions for corrugated beams 14 Figur

9、e 6 Diagrammatical representation of fences and barriers 15 Figure 7 TCB safety fence connection to steel parapet 16 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 (alternativ

10、e 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.) parapet

11、 (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 thickness 23 Figure 15 TCB safety fence post extensions (central reserve) 24 Figure 16 TCB sa

12、fety fence post extensions (verge) 25 Table 1 Type characteristics 4 Table 2 Components for1km of fence 8 Publications referred to Inside back coverBS6579-1:1988 ii BSI 04-1999 Foreword This Part of BS6579 has been prepared under the direction of the Road Engineering Standards Committee and it super

13、sedes BS6579-1:1985, which is withdrawn. This edition of this Part of BS6579 differs from the previous one in that additional information on post extensions has been included. The other Parts of BS6579 either published or in preparation are: Part 2: Specification for tensioned corrugated beam safety

14、 fence on offset brackets; Part 3: Specification for components for tensioned rectangular hollow section beam (100mm100mm) safety fence; Part 4: Specification for tensioned rectangular hollow section beam(200mm100 mm) safety fence; Part 5: Specification for open box beam safety fence (single height)

15、; 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. BS6579 is being produced at the request of users and manufacturers in order to cover the var

16、ious types of safety fences and barriers available. Fences detailed in Parts1 to7 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 systems under the dir

17、ection of the Transport and Road Research Laboratory (TRRL). The safety barrier in Part8 is for use only on certain roads at the date of publication of this Part of BS6579. If further types are developed, BS6579 will be revised and increased in scope to cover additions and variations. A British Stan

18、dard 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 comprises a front cover,

19、 an inside front cover, pages i and ii, pages1to 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 theinside front cover.BS6579-1:1988 BSI 04-1999 1 0 Introduction

20、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 practice the range of vehicle c

21、haracteristics 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 follows, within a narrow a

22、ngle, 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 of traffic. 0.2 The safety

23、 fences and barriers for ground mounting which are the subject of BS6579 are for use in conjunction with parapets on bridges and other structures, which are the subject of BS6779. Although definitions in both standards have been chosen so as to align as closely as possible, there are some cases wher

24、e the definition is applicable only to a particular Part of BS6579 and does not apply generally. 0.3 No direct guidance is given in BS6579 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

25、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 impairing the overall protection

26、 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 6579-5:1986. Appendix B give

27、s 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 for1km 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

28、 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 completed. 0.6 Figure 1 illustrate

29、s 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 posts (seeFigure 2) however are exp

30、ected 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 should be used. These should be set

31、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 Headquarters 1)or Regional Offices of the Departm

32、ent. 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 to take in order to restore the

33、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 BS6579 specifies requirements for the components to be used in the construction of the tensioned corrugated beam (TCB) type of safety fence supported on Z posts. Requi

34、rements are given for the materials and dimensions of the components and for protective finishes. This Part of BS6579 does not cover erection and tensioning of the assembled fence (see clause0). NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1) D

35、epartment of Transport, St Christopher House, Southwark Street. London SE1 0ET.BS6579-1:1988 2 BSI 04-1999 2 Definitions For the purposes of this Part of BS6579 the following definitions apply. 2.1 safety fence an installation provided for the protection of users of the highway consisting of horizon

36、tal 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 mounting posts nearest to the traffic 2.4

37、 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 nearer to the vehicular traffic flow 2.6 i

38、mpacting 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 setting back of ground anchorages behind the

39、 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 the full height of a safety fence NOTEFu

40、ll 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), when lap bolt clearances have been tak

41、en 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, complying with BS1449-1, type BHR, grade4

42、3/25. 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 steel complying with BS 4360 and to the

43、following grades: a) end posts: sections grade 43C, plates grade43A; b) other posts: grade 43A; c) full height anchorages: sections grade 43C, plates and angles grade43A. 3.2.2 Posts and anchorages shall comply with the dimensions shown in Figure 3 and Figure 4, respectively. 3.3 Adjuster brackets A

44、djuster brackets shall be made from either: a) cast steel complying with BS3100, grade A2 orA3; or b) spheroidal graphite cast iron complying with BS2789 modified to provide a minimum tensile strength of495N/mm 2with a minimum elongation of12% or c) steel complying with BS4360, grade 43A (ends may b

45、e 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, grade4.6 or as specified on the drawings. b) Nuts shall be ISO metric black hexagon nuts, complying with BS4190, grade4.BS6579-1

46、:1988 BSI 04-1999 3 c) Washers shall be black complying with BS4320, form E, F or G (seeTable 2). Taper washers for converging anchorages shall normally have a taper of not less than8 but the taper will vary with the differing angle between convergent beams. 3.5 Reinforcing rings and tie bars Reinfo

47、rcement for use in concrete foundation shall be made from10mm diameter steel rod, complying with BS4449, grade250. 3.6 Connecting straps For double sided fences, steel straps fabricated from steel grade 43A complying with BS4360 shall be fitted in pairs at all beam lap joints in such a way as to con

48、nect 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 BS6579. 4.2 Deviation from the specified dimensions for materials and fabricated components shall be measured before galvaniz

49、ing. 5 Protective finish All steel components, excluding reinforcing rings and reinforcing bars, shall be hot dip galvanized, in accordance with BS729, after fabrication. NOTEWhere the purchaser wishes the components to be painted by the supplier he should specify his requirements with the enquiry and/or order. In this respect attention is drawn toBS5493. 6 Marking All beams, posts, anchorages and adjuster brackets shall be clearly marked with the following: a) the number of this British Standard, i.e.BS6579 2) ; b) manufactur