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1、BRITISH STANDARD BS 5834-2: 1983 Surface boxes, guards and underground chambers for gas and waterworks purposes Part 2: Specification for small surface boxes UDC 621.646-758:628.1 + 662.76(23) Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
2、BS 5834-2:1983 This British Standard, 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 31 January 1983 BSI 01-1999 The following BSI references relate to the work on this standard: Com
3、mittee reference RDB/37 Draft for comment 80/15267 DC ISBN 0 580 13091 6 Cooperating organizations The Road Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: The organization marked with an asterisk in the above
4、 list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Asphalt and Coated Macadam AssociationGreater London Council Association of Consulting EngineersInstitute of Petroleum British Quarrying and Slag Federati
5、onInstitute of Quarrying British Tar Industry AssociationInstitution of Civil Engineers Cement and Concrete AssociationInstitution of Highway Engineers Concrete Society LimitedInstitution of Municipal Engineers Contractors Plant AssociationInstitution of Structural Engineers Convention of Scottish L
6、ocal AuthoritiesMinistry of Defence County Surveyors SocietyRefined Bitumen Association Ltd. Department of the Environment (PSA)*Road Emulsion Association Ltd. Department of the Environment (TransportRoad Surface Dressing Association and Road Research Laboratory)Sand and Gravel Association Limited D
7、epartment of TransportSociety of Chemical Industry Federation of Civil Engineering ContractorsTrades Union Congress Federation of Manufacturers of Construction Equipment and Cranes Association of Waterworks OfficersInstitution of Water Engineers and Scientists British Gas Corporation British Ironfou
8、nders AssociationIronfoundries National Association British Plastics FederationMetal Trades Organizations British Precast Concrete Federation Ltd.National Clayware Federation British Steel IndustryNational Water Council Clay Pipe Development Association Ltd.Severn Trent Water Authority Institution o
9、f Gas EngineersWater Companies Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5834-2:1983 BSI 01-1999i Contents Page Cooperating organizationsInside front cove
10、r Forewordii 1Scope1 2Definitions1 3Materials1 4Design features2 5Manufacture and workmanship3 6Coatings4 7Grading4 8Types4 9Designation and specified dimensions5 10Design loads and type testing5 11Quality control tests5 12Marking5 Appendix A Loading test8 Appendix B Optional items to be agreed betw
11、een the manufacturer and the purchaser8 Figure 1 Typical section of a composite unit6 Figure 2 Keyway dimensions7 Table 1 Designations and specified dimensions of surface boxes3 Table 2 Design loads and test loads6 Publications referred to10 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:
12、22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5834-2:1983 ii BSI 01-1999 Foreword As BS 1185 and BS 1426 N for non-rock, H for hinged and S for swivel cover. The full designations are given in Table 1. Certification. Attention is drawn to the certification facilities described on the inside ba
13、ck cover of this standard. 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 pag
14、es This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, 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
15、. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5834-2:1983 BSI 01-19991 1 Scope This Part of BS 5834 specifies requirements for surface boxes for gas, waterworks and general purposes primarily intended for use with gas valves and regul
16、ator chambers and for stop valves and sluice valves on service pipes and water mains. The largest size of surface box covered by this Part has a designated minimum clear opening of 300 mm in diameter. A summary of optional items to be agreed between the manufacturer and the purchaser is given in App
17、endix B. NOTEThe titles of the publications referred to in this standard are listed on page 10. 2 Definitions For the purposes of this Part of BS 5834 the following definitions apply. 2.1 surface box an assembly of a frame and cover to give access to a valve or regulator chamber 2.2 frame a part of
18、a surface box which receives and supports the cover 2.3 cover a part of a surface box which covers the access opening and which is constructed in one or two sections 2.4 composite unit a cover and frame set in a concrete surround and suitable for bedding on a sectional-type guard as described in Par
19、t 1 of this standard NOTEA cast iron surface box complying with the requirements of a grade A box, and subsequently surrounded by concrete, does not constitute a composite unit. 2.5 clear opening the access opening in the surface box through which a horizontal disc of a diameter equal to the specifi
20、ed minimum clear opening will pass unimpeded, without deviation from a vertical axis, when the surface box is placed in its normal position and with the cover fully open 3 Materials 3.1 Surface boxes 3.1.1 General. The materials used for the manufacture of surface boxes shall comply with the require
21、ments of 3.1.2, 3.1.3, 3.1.4 or 3.1.5. The cover and the frame shall be of the same material, i.e. all cast iron, all aluminium or all plastics. 3.1.2 Cast iron units. The metal used for the manufacture of iron castings shall be either: a) grey iron (flake graphite iron) of a quality not less than t
22、hat specified as grade 150 of BS 1452:1977; or b) ductile iron (spheroidal graphite iron or nodular graphite iron) complying with grades 500/7, 600/3 or 700/2 of BS 2789:1973 as selected by the manufacturer to suit the design and dimensions of the unit. 3.1.3 Aluminium units. The metal used for the
23、manufacture of aluminium castings shall comply with grades LM4, LM6 or LM26 of BS 1490 as selected by the manufacturer to suit the design and dimensions of the unit. 3.1.4 Plastics units 3.1.4.1 General. The materials used for the manufacture of plastics surface boxes included in this standard shall
24、 be either: a) thermoplastics; or b) thermosetting materials. NOTEIt should be noted that plastics materials may be adversely affected by heat, and care should be taken to avoid contact with hot materials e.g. hot rolled asphalt or mastic asphalt. 3.1.4.2 Thermoplastics materials. Thermoplastics mat
25、erials used for the manufacture of surface boxes shall have a Vicat softening point of not less than 100 C when tested by Method 120A of BS 2782-1. It is permissible for thermoplastics to be reinforced or unreinforced or to be filled or unfilled. Thermoplastics shall be coloured black by the incorpo
26、ration of between 1.5 % and 2.5 % by mass of finely dispersed carbon black. If colour coding of the lid is required for identification purposes, this shall be achieved by use of a coloured plastics insert. 3.1.4.3 Thermosetting materials. Thermosetting materials used for the manufacture of surface b
27、oxes shall be glass fibre reinforced polyester moulding compounds complying with BS 5734-3 or BS 5734-5. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5834-2:1983 2 BSI 01-1999 3.1.5 Composite units 3.1.5.1 General. The materials used f
28、or the manufacture of cover and frame shall comply with the requirements of 3.1.2, 3.1.3 or 3.1.4. The materials used for the concrete surround shall comply with the requirements of 3.1.5.2 to 3.1.5.5. 3.1.5.2 Cement. The cement used in manufacture shall be Portland cement (ordinary or rapid-hardeni
29、ng) complying with BS 12, Portland blastfurnace cement complying with BS 146-2 or sulphate-resisting Portland cement complying with BS 4027. The same type of cement shall be used throughout. NOTEIf sulphate-resisting cement is specifically required because of the ground conditions in which the guard
30、s are to be used, then the purchaser should specify this in the enquiry and/or order. 3.1.5.3 Minimum cement content. The cement content of the compacted concrete shall be not less than 400 kg/m3 (see also 5.3.2). 3.1.5.4 Aggregate. The aggregates shall comply with BS 882, BS 1201 except that the si
31、ze shall not exceed 6.3 mm. 3.1.5.5 Admixtures. The composition and use of admixtures, if required, shall follow the recommendations of CP 110-1. 3.2 Fasteners. Fasteners supplied for loosely coupling separate sections of covers shall be of steel or ductile iron and shall have cross sections of not
32、less than 28 mm2 for 100 mm and 135 mm boxes, 50 mm2 for 225 mm boxes and 78 mm2 for 300 mm boxes. If bolts or studs complying with BS 4190 or BS 4439 respectively are used, they shall be not less than M6, M8, M10 and M10 for surface boxes having clear openings of 100 mm, 135 mm, 225 mm and 300 mm r
33、espectively. 3.3 Hinge pins. Hinge pins shall be made from steel, ductile iron, plastics or non-ferrous metals, as selected by the manufacturer to suit the design and dimensions of the unit but plastics hinge pins shall only be used in conjunction with plastics surface boxes. Hinge pins made from st
34、ainless steel and non-ferrous metals shall be not less than 4 mm in diameter. Hinge pins made from ferrous metals other than stainless steel and hinge pins made from plastics shall be not less than 6 mm in diameter. Hinged units shall be capable of supporting the specified design loads without the h
35、inge pins forming part of the loadbearing surface. 3.4 Swivel pins. Swivel pins shall be made from steel, ductile iron or non-ferrous metals as selected by the manufacturer, and securely anchored to the cover, and captive to the frame. The pins shall have a minimum diameter of 12 mm and shall be of
36、suitable length to allow the cover to be lifted and swivelled. 4 Design features 4.1 Shape and size. The minimum clear-opening sizes shall be as given in Table 1. NOTE 1The shape, e.g. square, rectangular, circular, and the actual size are the product of the individual manufacturers design. NOTE 2If
37、 the purchaser desires to specify a particular shape, this should be stated on the enquiry and/or order. Frame dimensions for composite units shall be as specified in 4.10. 4.2 Displacement by traffic. The design of covers shall be such that they shall not be displaced by normal traffic. 4.3 Drainag
38、e and skid resistance. Covers shall be self-draining and have a raised pattern, such as chequers, so as to enhance skid-resistance. 4.4 Prising slots. At least one prising slot per cover-element shall be provided for the purpose of opening hinged covers and for initially loosening removable covers.
39、4.5 Keyways. Covers that are not hinged shall incorporate one keyway per cover-element as shown in Figure 2, for lifting purposes. NOTEThe purchaser should specify in his enquiry and/or order if open or closed keyways are required. 4.6 Clearance. The maximum clearance between cover and frame shall b
40、e 3 mm all round, with a permitted further clearance between cover sections of up to 3 mm. 4.7 Coupling of cover sections. Cover sections shall be loosely coupled; fasteners shall be provided with means to prevent tightening together of the cover sections (see 3.2). 4.8 Metal detection component for
41、 plastics units Plastics units shall be provided with a corrosion-resistant or suitably protected metal component moulded into or permanently fixed to the underside of the cover to facilitate detection using an electronic surface-box finder. The metal of the component shall have a minimum plan area
42、of 5 000 mm2 and a minimum thickness of 1 mm. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:22:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5834-2:1983 BSI 01-19993 Table 1 Designations and specified dimensions of surface boxes 4.9 Guards. Guards shall comply with BS 5834-1. 4.10 Com
43、posite units. The depth of frames of surface boxes of composite units shall be not less than 25 mm and the frame shall be set in the concrete surround to comply with the dimensions given in Figure 1. NOTEThe arrangement of the concrete base to match the purchasers type of guard should be specified b
44、y the purchaser in his order and/or enquiry. 5 Manufacture and workmanship 5.1 Cast iron and cast aluminium units. All units shall be cleanly cast and shall be free from air holes, sand holes, cold shuts and chill. They shall be neatly dressed and carefully fettled. All castings shall be free from v
45、oids, whether due to shrinkage, gas inclusions or other causes. 5.2 Plastics units. Plastics units shall be uniform in colour and composition and free from cracks, weld lines, surface voids and porosity, surface contamination, blistering and distortion. All excess flash shall be removed neatly. 5.3
46、Composite units: concrete surrounds 5.3.1 Protection from frost. No material that has been exposed to temperatures below freezing point shall be used until it is completely thawed. The temperature of any moulds shall be above freezing point. Assembled composite units shall be protected from the acti
47、on of frost for at least 48 h immediately after casting. 5.3.2 Compressive strength. The concrete shall have a 28 day cube strength of not less than 32 N/mm2, when tested in accordance with BS 1881-116. 5.3.3 Finished levels. The concrete surround shall finish level with the top of the frame (see Fi
48、gure 1). DesignationsMinimum clear opening diameter Minimum depth of frame Minimum bedding width of frame Minimum bedding area GradeType Non-rock (N) Hinged (H) Swivel cover (S) mmmmmm Grade A (heavy) 100 AN 135 AN 225 AN 300 AN 100 AH 135 AH 100 135 225 300 100 100 100 100 35 35 35 35 Grade B1a (me
49、dium) 100 B1H 135 B1H 100 B1S 100 135 75 75 See 9.2 See 9.2 Grade B2b (medium) 100 B2H 135 B2H 100 B2S 100 135 75 75 15 000 mm2 15 000 mm2 Grade C1a (light) 100 C1H 135 C1H 100 135 75 75 See 9.2 See 9.2 Grade C2b (light) 100 C2H 135 C2H 100 135 75 75 10 000 mm2 10 000 mm2 a Grade B1 and C1 boxes comply with the requirements of 9.2 and are suitable for use with or without pipe-type guards complying with the requirements of Part 1 of this standard. b Grade B2 and C2 boxes do not comply with the require