1、BRITISH STANDARD BS6579-7: 1989 Safety fences and barriers for highways Part 7: Specification for components for untensioned corrugated beam safety fence UDC 625.738.692.88BS6579-7:1989 This British Standard, having been prepared under the directionof the Road Engineering Standards Policy Committee,
2、 waspublished under the authorityof the Board of BSI andcomes into effect on 31December1989 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference RDB/18 Draft for comment 87/14724 DC ISBN 0 580 17714 9 Committees responsible for this British Standard The p
3、reparation of this British Standard was entrusted by the Road Engineering Standards Policy Committee (RDB/-) to Technical Committee RDB/18, upon which the following bodies were represented: Aluminium Federation Association of Consulting Engineers British Cement Association British Railways Board Bri
4、tish Steel Industry Convention of Scottish Local Authorities County Surveyors Society Department of Transport Institution of British Engineers Institution of Civil Engineers Institution of Highways and Transportation Royal Automobile Club Royal Society for the Prevention of Accidents The following b
5、odies were also represented in the drafting of the standard, through subcommittees and panels: Department of Transport (Engineering Policy and Programme Division) Department of Transport (Transport and Road Research Laboratory) Fencing Contractors Association Amendments issued since publication Amd.
6、 No. Date of issue CommentsBS6579-7:1989 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 1 3 Components 2 4 Tolerances 3 5 Protective finish 3 6 Marking 3 Appendix A Vehicle safety fences and barriers for highways: type chara
7、cteristics 4 Appendix B Transition between untensioned corrugated beam safety fence, bridge parapets and other types of safety fence 5 Appendix C List of components 5 Appendix D Information to be supplied 6 Appendix E Transport, handling and storage 6 Figure 1 Untensioned corrugated beam safety fenc
8、e 7 Figure 2 Details of beams for untensioned corrugated beam safety fence 8 Figure 3 Details of posts for untensioned corrugated beam safety fence 9 Figure 4 Profile and hole positions for corrugated beams 10 Figure 5 Untensioned corrugated beam safety fence connection to steel parapet 11 Figure 6
9、Untensioned corrugated beam safety fence connection to BACO (BACO Contracts Ltd.) parapet 12 Figure 7 Untensioned corrugated beam safety fence connection to AHDE (Alcan High Duty Extrusions Ltd.) parapet 13 Figure 8 Diagrammatical representation of fences and barriers 14 Table 1 Safety fences and ba
10、rriers: type characteristics 4 Table 2 List of components 4 Publications referred to Inside back coverBS6579-7:1989 ii BSI 03-1999 Foreword This Part of BS6579 has been prepared under the direction of the Road Engineering Standards Policy Committee. The other Parts of BS6579 either published or in p
11、reparation are: 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 3: Specification for components for tensioned rectangular hollow section beam (100 mm 100 mm) safety f
12、ence; Part 4: Specification for tensioned rectangular hollow section beam (200mm 100mm) safety fence; Part 5: Specification for open box beam safety fence (single height:); Part 6: Specification for open box beam safety fence (double height); Part 8: Specification for concrete safety barriers. BS657
13、9 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 Parts1 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 an
14、d 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 in Part8 is for use only on certain roads at the date of publication of this Part of BS6579. If further types are developed, the sta
15、ndard 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 application. Compliance with a British Standard does not of itself c
16、onfer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1to14, 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 indicate
17、d in the amendment table on theinside front cover.BS6579-7:1989 BSI 03-1999 1 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 carriageway and entering areas where it would be unsafe for them to travel
18、. 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. Safety barriers are intended to provide containment without significant defl
19、ection or deformation under impact, and to re-direct 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 BS6579 are for use in conjunction with parapets on bridges and other structures which are th
20、e subject of BS6779. Although definitions in both standards have been chosen so as to align as closely as possible, there are some cases where 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 wh
21、ere 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 Appendix A. 0.4 There are various situations and various methods by which
22、transition between a safety fence or safety barrier and a bridge parapet can be assured without impairing the overall protection afforded to the users of the highway. In the case of untensioned corrugated beam safety fence it is not appropriate to make a direct connection to a bridge parapet and tra
23、nsition to an open box beam safety fence should be made using a special transition piece. NOTEDetails of a special transition piece are given in Part5 of this standard. Appendix B gives recommendations on methods of connecting safety fences to bridge parapets and other types of safety fence. 0.5 It
24、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 the choice of intermediate posts to suit the ground conditions and the erection and maintenance of the fence. 0.6 Figure 1
25、illustrates the general arrangement of an untensioned corrugated beam safety fence for which the components specified in this Part of BS6579 are intended. It is essential that the end posts and all angled beam posts are surrounded by granular material rammed and ramped as illustrated in Figure 1. In
26、termediate timber posts should be surrounded by well rammed granular fill and steel posts driven securely. 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 Off
27、ices of the Department. 0.8 Appendix C gives a list of components for the safety fence and their Transport and Road Research Laboratory (TRRL) item numbers. 0.9 Appendix D lists information that should be provided when making an enquiry or order. 0.10 In Appendix E important recommendations are give
28、n on the transport, handling and storage of components prior to assembly on site. 1 Scope This Part of BS6579 specifies the requirements for the components to be used in the construction of the untensioned corrugated beam (UCB) type of safety fence. Requirements are given for the materials and dimen
29、sions of the components and for protective treatments and finishes. Erection of the assembled fence is outside the scope of this Part of BS6579 (see0.3). NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part o
30、f BS6579 the following definitions apply. 2.1 vehicle restraint system installation to provide a level of containment for errant vehicles to limit damage or injury to users of the highway 2.2 vehicle safety fence vehicle restraint system in the form of horizontal members mounted on posts 2.3 vehicle
31、 safety barrier vehicle restraint system that is continuously in contact with its supporting foundations throughout its length 1) Department of Transport, BE Division, St Christopher House, Southwark Street, London SE1 0TE.BS6579-7:1989 2 BSI 03-1999 2.4 single sided safety fence a safety fence havi
32、ng the face of its beams in front of, or in line with, the face of the supporting posts, with traffic approaching on one side only 2.5 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 traff
33、ic approaching on both sides 2.6 traffic face the face of a safety fence or barrier that is nearer to the vehicular traffic flow 2.7 impacting vehicle a vehicle striking a safety fence or barrier whether or not it is redirected 2.8 terminal that end-section of the length of a safety fence within whi
34、ch the beam rises from or is brought down to an anchorage 2.9 flaring (of the ends) the setting 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 beh
35、ind the safety fence. 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 tightened 3 Compo
36、nents 3.1 Beams Beams and angled beams shall be formed from steel, complying with BS1449-1, grade43/25, BHR or BS4360, grade43A. All beams shall have the profile shown in Figure 4 and comply with the appropriate dimensional requirements given in Figure 2. NOTEThe normal post spacing is3.2m and beams
37、 to cover a greater spacing than this should only be required as replacements in an existing installation. 3.2 Posts 3.2.1 Posts shall comply with the dimensional requirements shown in Figure 3. 3.2.2 Steel posts shall be made from steel complying with BS4360, grade43A except for the end post which
38、shall be made from steel complying with BS4360, grade43C. 3.2.3 Timber posts and packing blocks as shown in Figure 1 and Figure 3 respectively shall comply with the following requirements. a) Timber quality. Timber for posts and blocking out pieces shall be one of the species referred to in section
39、6 of BS5589:1989 for performance Category A. It shall be stress graded and marked to comply with BS4978 or BS5756 or other grading rules accepted in BS5268-2. The grade of timber for safety fence posts shall be not less than SC4 classification of BS5268. Alternatively, if the section is increased fr
40、om150mm 150mm to175mm 175mm, SC3 classification will be acceptable. b) Treatment. Hardwoods, where heartwood is classified in BS5589 as being sufficiently durable for a40 year service life in ground contact, may be used untreated. All other timbers and all timber containing sapwood shall be treated
41、in accordance with section 1 and section 6 of BS5589:1989 for performance Category A materials to be used in ground contact. NOTEThis category provides a service life of40 years. 3.3 Brackets Offset brackets, end shoes and spacers as shown in Figure 1 and Figure 2 shall be made from steel complying
42、with BS4360 grade43A. 3.4 Fasteners Fasteners shall be manufactured in steel as follows. a) Bolts and screws shall be ISO metric black hexagon type, complying with BS4190, grade4.6 unless otherwise specified on the figures. b) Nuts shall be ISO metric black hexagon nuts, grade4 complying with BS4190
43、unless otherwise specified on the figures. c) Washers shall be black complying with BS4320, form F or as in Table 2 unless otherwise specified on the figures. d) Nails shall comply with BS1202-1. e) Timber connectors shall comply with BS1579.BS6579-7:1989 BSI 03-1999 3 4 Tolerances 4.1 Tolerances on
44、 dimensions of components shall be in accordance with the appropriate dimensional specification, detailed drawings and relevant figure of this Part of BS6579. 4.2 Deviation from the specified dimensions for steel materials and fabricated components shall be measured before galvanizing. 5 Protective
45、finish 5.1 All steel components excluding reinforcing rings and reinforcing bars shall be hot dip galvanized, with tolerances as specified on the drawings, in accordance with Table 1 of BS729:1971, after fabrication. 5.2 Fasteners shall be spun galvanized (centrifuged) in accordance with BS729. NOTE
46、Where the purchaser wishes the components to be painted by the supplier he should specify his requirements with the enquiry or order. 6 Marking Every beam, post, anchorage and offset bracket shall be marked, indented or embossed with: a) the number of this British Standard, i.e.BS6579; b) manufactur
47、ers identification mark; c) digits indicating month and year of manufacture, (e.g.10/89 indicates manufacture during October1989).BS6579-7:1989 4 BSI 03-1999 Appendix A Vehicle safety fences and barriers for highways: type characteristics Information on type characteristics is given in Table 1. Illu
48、strations of fence and barrier types are given in Figure 8. Table 1 Safety fences and barriers: type characteristics Type Ref. Material Type of supportor mounting Post spacing Beam position mounting height Single/ double sided Tension un-tensioned T/UT Design deflection Design vehicle mass Vehicle s
49、peed Design angle of departure (max.) Comments m mm mm t km/h (miles/h) degrees Corrugated beam TCB1 Steel Z section steel post 3.2 Side 610 Single T 1000 1.5 113(70) 8 May reduce dazzle when mounted in central reserve. Corrugated beam TCB2 Steel Z section steel post 1.6 Side 610 Single T 800 f.5 113(70) 10 Corrugated beam TCB3 Steel Steel or timber post with off set 3.2 Side (inclined at 15) 535 Double T 800 1.5 113(70) 10 Corrugated beam TCB4 Steel Single Z section steel post 3.2 Side 610 Double T 800 1.5 113(70) 10 Corrugated beam
