1、BRITISH STANDARD BS6579-5: 1986 Safety fences and barriers for highways Part 5: Specification for open box beam safety fence (single height) UDC 625.738+692.88BS6579-5:1986 This British Standard, having been prepared under the directionof the Road EngineeringStandards Committee, was published undert
2、he authority of the BoardofBSI and comes into effect on 31 December1986 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference RDB/18 Draft for comment 84/14875 DC ISBN 0 580 15113 1 Committees responsible for this British Standard The preparation of this B
3、ritish 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 Consulting Engineers British Railways Board British Steel Industry Cement and Concrete Association Co
4、nvention of Scottish Local Authorities County Surveyors Society Department of Transport (Highways) Institution of British Engineers Institution of Civil Engineers Institution of Highways and Transportation Royal Automobile Club Royal Society for the Prevention of Accidents Coopted members The follow
5、ing 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 publication Amd. No. Date of issue CommentsBS6579-5:1986 BSI 06-1999 i Contents
6、 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 finish 3 6 Marking 3 Appendix A Vehicle safety fences and barriers for highways: type characteristics 4 Appendix B Transition between safety fences, bridg
7、e parapets and other types of safety fence 5 Appendix C Schedule for components for1km of fence 5 Appendix D Mounting of open box beam safety fence on acoustic barrier 5 Appendix E Limiting radius of installation on a curve 9 Appendix F Transport handling and storage 9 Appendix G Information to be s
8、upplied 9 Figure 1 General arrangement of an open box beam safety fence 10 Figure 2 Details of posts, spacers, fishplates and stiffeners 11 Figure 3 Anchorages 12 Figure 4 Section through fence: beams 13 Figure 5 Mounting bracket, transition pieces and clamp plates 14 Figure 6 Mounting brackets for
9、open box beam safety fence on acoustic barrier 15 Figure 7 Open box beam safety fence connection to steel parapet 16 Figure 8 Open box beam safety fence connection to BACO parapet 17 Figure 9 Open box beam safety fence connection to Alcan High Duty Extrusions Ltd. parapet 18 Figure 10 Open box beam
10、safety fence connection to concrete safety barrier: single-sided 19 Figure 11 Open box beam safety fence connection to concrete safety barrier: double-sided 20 Figure 12 Mounting of open box beam safety fence on acoustic barrier 21 Figure 13 Diagrammatical representation of fences and barriers 22 Ta
11、ble 1 Safety fences and barriers: type characteristics 4 Table 2 Components for 1km of fence 6 Table 3 Limiting radius of installation on a curve 9 Publications referred to Inside back coverBS6579-5:1986 ii BSI 06-1999 Foreword This Part of BS6579 has been prepared under the direction of the Road En
12、gineering Standards Committee. The other Parts of BS6579 either published or in preparation 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
13、tensioned rectangular hollow section beam safety fence (100mm100mm); Part 4: Specification for tensioned rectangular hollow section beam safety fence (200mm100mm); Part 6: Specification for open box beam safety fence (double height); Part 7: Specification for untensioned corrugated beam safety fence
14、s; Part 8: Specification for concrete safety barriers. Appendix A and Appendix B of this Part of BS6579 provide additional information helpful to the users of the components. BS6579 is being produced at the request of users and manufacturers in order to cover the various types of safety fences and b
15、arriers available. Fences detailed in Parts1to7have 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 direction of the Transport and Road Re
16、search Laboratory (TRRL). The safety barrier detailed in Part8 is for use only on certain roads at the date of publication of this standard. If further types are developed, BS6579 will be revised and increased in scope to cover additions and variations. A British Standard does not purport to include
17、 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, an inside front cover, pagesi a
18、ndii, pages1 to22, 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.BS6579-5:1986 BSI 06-1999 1 0 Introduction 0.1 The objective of providing sa
19、fety 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. Safety fences are intended to absorb some of the energy of impact and to redirect the errant vehicle, so that it follows, wi
20、thin 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 re-direct errant vehicles along the line of the barrier in the direction of traffic
21、. 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, which are the subject of an associated British Standard. Although definitions in both standards have been chosen so as to align as closely as possible, there
22、are some cases where a 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 informati
23、on 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 impairing the o
24、verall protection afforded to users of the highway. Appendix B gives recommendations for connections between this type of safety fence and existing designs of metal parapet and also connections to other types of safety fence. In Appendix C the number of components is given for1km of safety fence and
25、 Appendix D gives recommendations for mounting an open box beam fence on acoustic barrier. 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 the choice of intermediat
26、e posts to suit the ground conditions and the erection and maintenance of the fence. 0.6 Direct connection to a bridge parapet is to be made by using the special connectors as shown on the drawings. These vary according to the material of the parapet and whether the tension from a tensioned corrugat
27、ed beam safety fence is transmitted through the open box beam fence to the parapet end post or absorbed in a full-height anchorage. 0.7 Figure 1 illustrates the general arrangement of an open box beam safety fence for which the components specified in this Part of BS6579 are intended. It is essentia
28、l that the end posts and all angled beam posts are set in concrete as illustrated in the figure. Intermediate posts (see Figure 2) however, are expected to be either driven, or set in concrete into the ground, or mounted on bridge decks using “bridge deck posts” as shown in Figure 2. Where an open b
29、ox 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 the approach and departure ends of the bridge deck. 0.8 Where an open box beam safety fence is used on a curve the limiting radius of the
30、 installation should be as given in Appendix E. 0.9 The approach to the safety fence should be set back away from the traffic and flared as shown in Figure 1. The flare length should be at least ten times the set back. 0.10 Enquiries concerning the availability of detailed drawings providing informa
31、tion on manufacture and installation should be made to the Transport and Road Research Laboratory 1) . 0.11 In Appendix F important recommendations are given on the transport, handling and storage of components prior to assembly on site and Appendix G lists information that should be provided when m
32、aking an enquiry or order. 1 Scope This Part of BS6579 specifies the requirements for the components to be used in the construction of the open box beam type of safety fence. Requirements are given for the materials and dimensions of the components and for protective finishes. Erection of the assemb
33、led fence is outside the scope of this Part of BS6579 (see clause0). NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1) Transport and Road Research Laboratory, Old Wokingham Road, Crowthorne, Berks, RG116AU.BS6579-5:1986 2 BSI 06-1999 2 Definition
34、s 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 horizontal beams mounted on posts 2.2 safety barrier an installation provided for the protection of users of the highway which
35、 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 fence with beams on opposite sides of the mounting posts and at the same height 2.5
36、 traffic face the face of a safety fence or barrier that is nearer to the vehicular traffic flow 2.6 impacting vehicle a vehicle striking a safety fence or barrier whether or not is redirected 2.7 terminal the end-section of the length of a safety fence within which the beam rises from or is brought
37、 down to an anchorage 2.8 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 behind the safety fence. 2.9 full heigh
38、t anchorage a cross-braced frame extending to the 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 t
39、he centre of the angled beam post (the datum) 3 Components NOTE 1Where it is required to provide a connection to a tensioned-corrugated beam safety fence, special transition pieces should be provided (see Figure 5). NOTE 2An expansion beam assembly (see Figure 1) should be installed when uninterrupt
40、ed lengths of open box beam safety fence exceeding100m are erected. When the temperature is expected to fluctuate more than60C additional expansion beam assemblies will be required. 3.1 Beams All beams shall be formed from steel,5mm stock thickness, to grade43A of BS4360 (see Figure 4). 3.2 Posts an
41、d anchorages 3.2.1 All posts and anchorages shall be made from steel complying with the requirements of BS4360 and to the following grades: 3.2.2 Posts and anchorages shall conform to the appropriate dimensional requirements shown in Figure 2 and Figure 3. 3.3 Fish plates Flanged channel section pla
42、tes (see Figure 2) shall be formed from steel,6mm stock thickness, to grade43A of BS4360 and used in pairs for connecting the beams together, the standard plates being designed to transmit bending to the adjacent beams. NOTEThe special plates, which should be painted red for the purposes of identifi
43、cation, are narrower, and when used in conjunction with the half length beams enable the fence to be installed to a curve (see Appendix E). a)End posts: sections grade43C, 5mm stock thickness plates grade43A, 10mm stock thickness b)Other posts: grade43A, 5mm stock thickness c)Full height anchorages:
44、 sections grade43C plates and angles grade43ABS6579-5:1986 BSI 06-1999 3 3.4 Mounting brackets Where the beam is mounted on a structure other than on posts hexagonal shaped brackets (seeFigure 5 and Figure 6) for absorbing impact energy shall be provided between the beam and the structure. They shal
45、l be fabricated from steel,6mm stock thickness, to grade43A of BS4360 except in the case of an acoustic barrier where they shall be steel,8mm stock thickness. Where the mounting of brackets is such that a parallel face is not presented to the carriageway an adaptor platform, also fabricated from ste
46、el to grade43A of BS4360 shall be provided and attached to the bridge pier or structure by means of anchor bolts (see Figure 1). 3.5 Clamp plates Clamp plates fabricated in steel,6mm stock thickness, (see Figure 5) to grade43A of BS4360 shall be inserted into the open box beams so as to register on
47、the flanges and shall be used to clamp the beams to the posts or to the off-set brackets or spacers. 3.6 Spacers and stiffeners When it is necessary for a double-sided safety fence to be used to enclose lighting columns, spacer channels shall be provided on both sides of the posts so as to increase
48、the gap between the backs of the two beams from110mm to300mm or400mm, depending upon the requirement and the type of spacer used. In order to provide additional rigidity, cross-braced frames shall be fitted at the mid-point between each post (see Figure 1). Spacers and stiffeners shall be fabricated
49、 from steel,5mm and6mm stock thicknesses respectively, to grade43A of BS4360. 3.7 Fasteners Bolts, screws, nuts and washers shall be manufactured in steel as follows. a) Bolts and screws shall be ISO metric black hexagon type, complying with grade4.6of BS4190. b) Nuts shall be ISO metric black hexagon nuts, complying with grade4of BS4190. c) Washers shall be black complying with BS4320, Form A, E or F as in Table 2, or grade304S15of BS1449-2, for stainless steel washers. d) Stainless steel bolts and nuts shall be in accordance wit
