1、BRITISH STANDARD BS 6579-4: 1990 Safety fences and barriers for highways Part 4: Specification for components for tensioned rectangular hollow section beam (200mm 100 mm) safety fence UDC 625.738 + 692.88:006.3/.8BS6579-4:1990 This British Standard, having been prepared under the directionof the Roa
2、d Engineering Standards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31 May 1990 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference RDB/18 Draft for comment 87/12156 DC ISBN 0 580 17713 0 Committees respo
3、nsible for this British Standard The preparation 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
4、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 and Transportation Royal Automobile Club Royal Society for the P
5、revention of Accidents The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Department of Transport (Bridges Engineering Division) Department of Transport (Transport and Road Research Laboratory) Fencing Contractors Association Amendments issu
6、ed since publication Amd. No. Date of issue CommentsBS6579-4:1990 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Definitions 2 3 Requirements for components 2 4 Tolerances 3 5 Protective finish 3 6 Marking 3 Appendix A Vehicle safety fe
7、nces and barriers for highways: type characteristics 4 Appendix B Transition between safety fences and bridge parapets 6 Appendix C Limiting radius of installation on a curve 6 Appendix D Schedule of components for 1 km of fence 6 Appendix E Transport, handling and storage 11 Appendix F Information
8、to be supplied 11 Appendix G Post extensions 11 Figure 1 General arrangements of tensioned rectangular hollow sectionbeam(200 mm 100 mm) safety fence 12 Figure 2 Details of beams 13 Figure 3 Details of posts 15 Figure 4 Details of tensioning components 16 Figure 5 Details of expansion joint anchorag
9、es 17 Figure 6 Detail of installation of fence adjacent to bridge piers and structures 18 Figure 7 Tensioned RHS beam safety fence (200mm 100mm) connectiontosteel parapet 19 Figure 8 Tensioned RHS beam safety fence (200mm 100mm) connectiontoBACO (BACO Contracts Ltd) parapet 20 Figure 9 Tensioned RHS
10、 beam safety fence (200mm 100mm) connectiontoAHDE (Alcan High Duty Extrusions Ltd) parapet 21 Figure 10 Tensioned RHS beam safety fence (200mm 100mm) connectionto AHDE (Alcan High Duty Extrusions Ltd) parapet (alternativemethod) 22 Figure 11 Tensioned RHS beam safety fence (200mm 100mm) connectionto
11、 BACO (BACO Contracts Ltd) parapet (alternative method) 23 Figure 12 Diagrammatical representation of fences and barriers 24 Table 1 Type characteristics 5 Table 2 Components for1km of fence 7 Publications referred to Inside back coverBS6579-4:1990 ii BSI 08-1999 Foreword This Part of BS6579has been
12、 prepared under the direction of the Road Engineering Standards Policy Committee. The other Parts of BS6579 either published or in preparation are: Part 1: Specification for components for tensioned corrugated beam fence on“Z” posts; Part 2: Specification for tensioned corrugated beam fencing on off
13、set brackets 1) ; Part 3: Specification for components for tensioned rectangular hollow section beam (100 mm 100 mm) safety fence; Part 5: Specification for open box beam safety fence (single height); Part 6: Specification for components for open box beam safety fence (double height); Part 7: Specif
14、ication for untensioned corrugated beam safety fences; Part 8: Specification for concrete safety barriers. Appendix A andAppendix B of this Part of BS6579 provide additional information helpful to the users of the components. Fences detailed in Parts 1 to 7 have been developed already and approved f
15、or 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 Research Laboratory (TRRL). The safety barrier detailed in Part8 is for use only on certain
16、 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 Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respons
17、ible 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, pages i and ii, pages1to24, an inside back cover and a back cover. This standard has been u
18、pdated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Work of this Part of BS6579 is in abeyance.BS6579-4:1990 BSI 08-1999 1 0 Introduction 0.1 The objective of providing safety fences or barriers adjacent to
19、 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, within a narrow angle, the line of the
20、 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 fences and barriers
21、for ground mounting which are the subject of BS6579are for use in conjunction with parapets on bridges, 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 where a definition is applicable only to a part
22、icular 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 general characteristics of different types of
23、 safety fences is given inAppendix 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 afforded to the users of the highway. Appendix B gives rec
24、ommendations for connections between this type of safety fence and existing designs of metal parapets. 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
25、 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 section beam(200mm
26、 100mm) 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 set in concrete as illustrated inFigure 1. Intermediate posts, as illustrated inFigure 1 and detailed inFigure 3 are either driven securely in
27、to the ground, or set in concrete in 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 inFigure 5 should be used. These should be set in concrete and located adjace
28、nt to the approach and departure ends of the bridge deck.Figure 6 shows typical details for the installation at a bridge pier or similar structure. 0.7 Enquiries concerning the availability of detailed drawings providing information on manufacture and installation should be made to the Department of
29、 Transport 2) . 0.8 Where a tensioned rectangular hollow section beam safety fence is used on a curve the limiting radius of the installation should be as given in Appendix C. 0.9 The approach to the safety fence should be set back away from the traffic and flared. The flare length should be at leas
30、t ten times the set back. 0.10 InAppendix D the number of components is given for 1km of safety fence. 0.11 InAppendix E important recommendations are given on the transport, handling and storage of components prior to assembly on site and Appendix F lists information that should be provided when ma
31、king an enquiry or order. 0.12 InAppendix G information is given on the action to be taken after raising of the running surface in order to maintain the height of the safety fence. 1 Scope This Part of BS6579specifies requirements for the components to be used in the construction of tensioned rectan
32、gular hollow section(200mm 100mm), type TRHS2 safety fence supported on “Z” posts. Requirements are made in respect of materials, dimensions, protective finishes and identification. Erection and tensioning of the assembled fence is outside the scope of this Part of BS6579(see0.3). NOTEThe titles of
33、the publications referred to in this standard are listed on the inside back cover. 2) Department of TRansport, BE Division, St Christopher House, Southwark Street, London SE1 OTE.BS6579-4:1990 2 BSI 08-1999 2 Definitions For the purposes of this Part of BS6579 the following definitions apply. 2.1 ve
34、hicle 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 that is continuously in contact with its supporting foundations throughout its length 2.3 vehicle safety fence
35、 vehicle restraint system in the form of horizontal members mounted on posts 2.4 single sided safety fence a safety fence having the traffic 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 saf
36、ety 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 2.6 traffic face the face of a safety fence or barrier that is nearer the vehicular traffic flow 2.7 impacting vehicle a vehicle striking
37、 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 which 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 i
38、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. 2.10 full height anchorage a cross-braced frame extending to the full height of a safety fence NOTEFor use in locations where ground anchorages are
39、 not suitable. 2.11 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 bolt clearances have been taken up but before beam to post connections are tightened 2.12 adjuster assem
40、bly a device for tensioning safety fences and adjusting the verticality of end posts 3 Requirements for components 3.1 Beams Beams shall be fabricated from200mm 100mm 5mm hot rolled rectangular hollow sections in accordance with the dimensional requirements of BS4848-2 and Figure 2 of this Part of B
41、S6579 and with physical properties in accordance with BS4360grade43C. 3.2 Posts and anchorages 3.2.1 Posts and anchorages shall be made from steel in accordance with BS4360 and to the following grades: a) rectangular hollow sections: grade 43C; b) angle and channel sections: grade 43A; c) plates: gr
42、ade 43A. 3.2.2 Posts and anchorages shall be dimensionally in accordance with Figure 3 andFigure 5 of this standard and the following: a) rectangular hollow sections: BS 4848-2; b) angle sections: BS 4848-4; c) channel sections: BS 4-1. 3.3 Adjuster turn-buckles and nuts Adjuster turn-buckles and nu
43、ts shall be manufactured in steel in accordance with BS970-1 grade 080M40 and shall be dimensionally in accordance withFigure 4 of this standard. 3.4 Connections 3.4.1 Connector plates. Connector plates shall be made from steel in accordance with BS4360 grade43Aand shall be dimensionally in accordan
44、ce withFigure 2 of this standard.BS6579-4:1990 BSI 08-1999 3 3.4.2 Connectors. Connectors shall be made from hot rolled rectangular section dimensionally in accordance with BS4848-2 andFigure 4 of this standard and with physical properties in accordance with BS4360 grade43C. 3.4.3 Fasteners. Bolts,
45、screws, nuts and washers shall be manufactured in steel and selected from the following as appropriate. a) Bolts and screws shall be ISO metric black hexagon type, complying with grade 4.6 of BS4190 unless specified otherwise in Appendix DTable 2. b) Nuts shall be ISO metric black hexagon nuts compl
46、ying with grade4 of BS4190 unless specified otherwise in Appendix D,Table 2. c) Washers shall be black complying with BS4320form A, as in Appendix D,Table 2, or BS1449-2, grade 304S15 for stainless steel washers. d) Stainless steel bolts and nuts shall be in accordance with grade A.4-80 of BS 6105.
47、NOTEThe above items, except those manufactured from stainless steel, should be spun galvanized before use (seeclause5). 3.5 Transition pieces Beam transition pieces shall be manufactured from hot rolled rectangular hollow section steel dimensionally in accordance with BS4848-2 and Figure 2 of this s
48、tandard and with physical properties in accordance with BS4360 grade43C and grade50C. 3.6 Reinforcing rings and tie bars Reinforcement for use in concrete foundations shall be made from 10mm diameter steel rod in accordance with BS4449 grade 250. 4 Tolerances 4.1 Tolerances on dimensions of componen
49、ts 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 materials and fabricated components shall be measured before galvanizing. 5 Protective finish 5.1 All steel components excluding stainless steel items, reinforcing rings and reinforcing bars shall be hot dipped galvanized, in accordance with BS729, after fabrication. 5.2 Fasteners shall be spun galvanized. NOTE 1Where the purchaser wishes
