1、BRITISH STANDARD BS 248:1969 Specification for Light rails and fishplates For use at minesBS248:1969 This British Standard, having been approved by the Mining andQuarrying Requisites Industry Standards Committee, was published under the authorityof the Executive Boardon 30 January1969 BSI 06-1999 Fi
2、rst published July, 1926 Reset in new type June, 1949 First revision, January, 1969 The following BSI references relate to the work on this standard: Committee reference MQE/4 Draft for comment 67/23143 ISBN 580 00430 9 Co-operating organizations The Mining and Quarrying Requisites Industry Standard
3、s Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Association of Mining Electrical and Mechanical Engineers British Electrical and Allied Manufacturers Association
4、 British Steel Industry* Federation of Associations of Mining Equipment Manufacturers Institution of Electrical Engineers Institution of Mechanical Engineers Institution of Mining Engineers* Mechanical Handling Engineers Association Ministry of Power* National Association of Colliery Managers Nation
5、al Coal Board* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Steel Arch and Light Rail Association Amendments issued since publication Amd. No. Date Comment
6、sBS248:1969 BSI 06-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Rails 1 3 Fishplates 11 4 Fishbolts 11 Figure 1 Location of tensile test piece 1 Table 1 Dimensions of light flat bottom rails 4 Table 2 Dimensions of light bridge rails 6 Table 3 Position o
7、f bolt holes at end of rails 8 Table 4 Position and dimensions of nail holes in flat bottom rails 10 Table 5 Dimensions of fishbolts and nuts 11 Table 6 Dimensions of fishplates for light flat bottom rails 13 Table 7 Position and dimension of holes in fishplates for light flat bottom rails 15BS248:1
8、969 ii BSI 06-1999 Foreword In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to whic
9、h they refer. A complete list of British Standards, numbering over5000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook, price15s. The BS Yearbook may be consulted in many public libraries and similar institutions. This standard makes reference
10、to the following British Standards: BS 18, Methods for tensile testing of metals. BS 325, Black cup and countersunk bolts and nuts. BS 916, Black bolts, screws and nuts. This revision of the 1926 edition of BS248, which was issued with the authority of the Mining and Quarrying Requisites Industry St
11、andards Committee, is applicable to light rails and fishplates for use at mines. The specification has been brought into line with current developments and present day practice and, although imperial units have been maintained therein, calculated metric equivalents have also been provided for guidan
12、ce, and as a tentative measure, in anticipation of the forthcoming overall change to the metric system. NOTECertain of the metric conversions given are approximate. More accurate conversions, if required, should be based on the tables in BS350, “Conversion factors and tables”. A British Standard doe
13、s 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, an insi
14、de front cover, pagesi andii, pages1 to16 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.BS248:1969 BSI 06-1999 1 1 Scope This British Standard specifies requireme
15、nts for light flat bottom and bridge rails, fishplates and fishbolts for underground track and associated surface track at mines. 2 Rails 2.1 Rail sections. The standard rail sections shall be rolled to the dimensions given in Table 1 for light flat bottom rails and in Table 2 for light bridge rails
16、. 2.2 Material. The finished rail shall be of prime or re-rolled steel. The sulphur and phosphorus content shall not exceed0.060% of each element. 2.3 Tensile test and test pieces. If the purchaser requires the tensile properties of the steel, they shall be determined in accordance with BS18 1) , us
17、ing standard round tensile test pieces having a gauge length equal to5.65S oand a diameter equal to0.564 in or0.399 in. Such tests shall be made on a standard test piece taken from a position as shown in Figure 1. 2.4 Tensile properties. The test shall show that the steel has a minimum tensile stren
18、gth of35 tonf/in 2(54 hbar 2) ) and a minimum elongation of12%. 2.5 Number of tensile tests. If required by the purchaser the manufacturer shall make one tensile test from every25 tons (25.4 tonnes), or part of25 tons of rails rolled. 2.6 Branding. The BS section reference number, the manufacturers
19、name, initials or other recognized mark, and the year of manufacture, shall be rolled on one side of the web of each rail in letters ; in (19mm) high, or as near to this figure as is practicable for the particular rail section. Re-rolled rails shall be additionally identified by the letters “RR”. 2.
20、7 Finish. All rails shall be of uniform section, straight, free from twist, sound and clean. 1) BS18, “Methods for tensile testing of metals”. Figure 1 Location of tensile test piece 2) 1 hbar=10 N/mm 2 =0.647 49 tonf/in 2BS248:1969 2 BSI 06-1999 2.8 Permissible variation in dimensions. The rail pro
21、files shall be within the following tolerances: 2.9 Sawing. The ends of all rails shall be sawn true and square. All burrs shall be removed before the rails are despatched from the manufacturers works. 2.10 Length of rail. The purchaser shall specify the normal length to which the rails are to be su
22、pplied. The manufacturer shall have the option of supplying, and the purchaser shall accept, shorter lengths upto7% in weight of the quantity contracted for. Such shorter lengths shall also be specified by the purchaser. 2.11 Permissible variation in length. Rails shall comply, as appropriate, with
23、the following tolerance on specified length, at a temperature of20C: 2.12 Calculated weight. The weights of rail quoted in this British Standard have been determined by multiplying the sectional area (in 2 ) by a factor of10.209 to give the weight in pounds per yard. The calculated weight shall be r
24、egarded as the actual weight unless otherwise agreed. 2.13 Fishbolt holes in rails. The flat bottom rails shall be holed through the web at each end to the dimensions shown in Table 3. Fishbolt holes shall, at one stroke of the machine, be punched perpendicular to the web of the rail. Alternatively,
25、 the holes may be drilled. All holes shall be clean and free from burrs. 2.14 Nail holes. When rails are to be provided with nail holes, this requirement shall be stated by the purchaser. The nail holes shall be in accordance with the dimensions shown in Table 4, where the rail length is a multiple
26、of3ft (0.914m). For other rail lengths the nail hole pitches shall be stated by the purchaser. The variation in rail length, within the appropriate tolerance specified in2.11, shall be accommodated in one of the end3ft pitches. Nail holes shall, at one stroke of the machine, be punched parallel with
27、 the vertical axis of the rail. Alternatively, the holes may be drilled. All holes shall be clean and free from burrs. 1) Overall height of rail 1 / 32in (0.8 mm). 2) Width of head 1 / 32in (0.8 mm). 3) Width of flange + 1 / 32in (0.8 mm). 1 / 16in (1.6mm). Length up to and including24 ft (7.3m) in
28、( 12.7mm) Length exceeding24ft (7.3m) 1 in ( 25.4mm)BS 248:1969 BSI 06-1999 3 See Table 1 belowBS 248:1969 4 BSI 06-1999 Table 1 Dimensions of light flat bottom rails BS ref. No. Nominal weight of rail A B C D E F G H J K L M Area of section Calculated weight lb/yd Dimensions in inches in 2 lb/yd 16
29、M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 2 1 /16 2 3 / 16 2 1 / 2 2 3 / 4 3 25 / 64 31 / 64 17 / 32 19 / 32 39 / 64 3 / 4 25 / 32 7 / 8 15 / 16 1 3 / 32 1 3 / 321 7 / 32 1 3 / 8 1 1 / 2 1 11 / 16 2 5 / 16 2 9 / 16 2 3 / 4 2 31 / 32 3 3 / 16 1 / 4 17 / 64 21 / 64 23 / 64 23 / 64 3 /
30、16 1 / 4 5 / 16 5 / 16 5 / 16 1 / 83 / 16 1 / 4 1 / 4 1 / 4 1 / 8 3 / 16 3 / 16 3 / 16 3 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 1 / 16 5 5 5 5 5 1.568 1.958 2.450 2.938 3.440 16.01 19.99 25.01 29.99 35.12 Metric equivalents (mm) cm 2 kg/m 16M (FB) 20M (FB) 25M (FB) 30M (
31、FB) 35M (FB) 52.39 55.56 63.5 69.85 76.2 9.92 12.3 13.49 15.08 15.48 19.05 19.84 22.22 23.81 27.78 27.78 30.96 34.92 38.1 42.86 58.74 65.09 69.85 75.41 80.96 6.35 6.76 8.33 9.13 9.13 4.76 6.35 7.94 7.94 7.94 3.17 4.76 6.35 6.35 6.35 3.17 4.76 4.76 4.76 4.76 1.59 1.59 1.59 1.59 1.59 1.59 1.59 1.59 1.
32、59 1.59 127 127 127 127 127 10.1 12.63 15.81 18.95 22.19 7.94 9.91 12.41 14.88 17.42BS 248:1969 BSI 06-1999 5 See Table 2 belowBS 248:1969 6 BSI 06-1999 Table 2 Dimensions of light bridge rails BS ref. No. Nominal weight of rail A B C D F G H J K L M Area of section Calculated weight lb/yd Dimension
33、s in inches in 2 lb/yd 14M (B) 18M (B) 22M (B) 14 18 22 2 7 / 8 3 3 1 11 / 16 13 / 32 1 1 / 2 1 11 / 16 2 9 / 16 5 / 8 1 1 / 4 9 / 32 9 / 32 a 5 / 16 9 / 32 1 / 4 11 / 32 1 / 4 3 / 8 1 / 4 1 / 4 3 / 16 5 / 16 5 / 16 5 / 16 9 / 32 13 / 64 5 / 16 3 / 4 7 / 8 15 / 16 1.373 1.765 2.150 14.02 18.02 21.95
34、 Metric equivalents (mm) cm 2 kg/m 14M (B) 18M (B) 22M (B) 73.03 76.2 76.2 25.4 26.99 27.78 38.1 42.86 50.8 14.29 15.88 25.4 6.35 7.14 7.14 a 7.94 7.14 6.35 8.73 6.35 9.53 6.35 6.35 4.76 7.94 7.94 7.94 7.14 5.16 7.94 19.05 22.23 23.81 8.86 11.39 13.87 6.95 8.94 10.89 a The thickness of the flange of
35、 this rail tapers from 19 / 64in (7.54mm) to 17 / 64in (6.75mm) at the toe.BS 248:1969 BSI 06-1999 7 See Table 3 belowBS 248:1969 8 BSI 06-1999 Table 3 Position of bolt holes at end of rails BS ref. No. Nominal weight of rail Tolerances in 1 / 16 1 / 8 0 1 / 16 N Dia. of fishbolts mm 1.59 3.17 0 1.5
36、9 J K L M lb/yd Dimensions in inches 16M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 Nominal gap 1 / 4 1 5 / 8 1 / 2 5 / 8 5 / 8 3 / 4 3 / 4 3 1 / 2 31 / 32 1 1 / 8 1 13 / 64 1 5 / 16 1 11 / 32 3 / 8 1 / 2 1 / 2 5 / 8 5 / 8 Metric equivalents (mm) 16M (FM) 20M (FB) 25M (FB) 30M (FB) 35M
37、(FB) 6.35 41.27 12.7 15.87 15.87 19.05 19.05 88.9 24.61 28.57 30.56 33.34 34.13 9.52 12.7 12.7 15.87 15.87BS 248:1969 BSI 06-1999 9 See Table 4 belowBS 248:1969 10 BSI 06-1999 Table 4 Position and dimensions of nail holes in flat bottom rails BS ref. No. Width of flange Hole centres Hole diameter A
38、N B Tolerance Dimensions in inches 16M 20M 25M 30M 35M 2 1 / 16 2 3 / 16 2 1 / 2 2 3 / 4 3 1 3 / 8 1 3 / 8 1 5 / 8 1 7 / 8 2 1 / 8 3 / 8 3 / 8 1 / 2 1 / 2 1 / 2 + 1 / 32 0 Metric equivalents Other equivalents 16M 20M 25M 30M 35M 52.39 55.56 63.5 69.85 76.2 34.92 34.92 41.27 47.62 53.97 9.52 9.52 12.
39、7 12.7 12.7 +0.8 0 ft 3 in 0 1 5 / 8 7 / 8 3 / 4 0.914m 41.27mm 22.22mm 19.05mmBS248:1969 BSI 06-1999 11 3 Fishplates 3.1 Material. The finished fishplates shall be of steel having a tensile strength of24 tonf/in 2 to35 tonf/in 2(37hbar to54 hbar) and a minimum elongation of20%. 3.2 Dimensions. The
40、fishplates shall conform appropriately to the dimensions shown in Table 6 and Table 7. 3.3 Cutting. The ends of the fishplates shall be sawn or sheared square and all burrs shall be removed. 3.4 Straightness. The fishplates shall be straight and of uniform section. 3.5 Holes. The holes shall at one
41、stroke of the machine be punched at right angles to the section. They shall be clean, without burrs and shall conform to the dimensions and pitch shown in Table 7. 4 Fishbolts 4.1 General requirements. The fishbolts and nuts shall be of the black cup square type and be of the dimensions specified in
42、 Table 5. They shall comply with the provisions of BS325 3) , except for the length of thread of the ); in (9.52mm) diameter bolt. Table 5 Dimensions of fishbolts and nuts NOTEThe British Standards Institution is the owner of a registered certification trade mark. This is shown below, enclosed in th
43、e words “Approved to British Standard”. This mark can be used only by manufacturers licensed under the certification mark scheme operated by BSI. The presence of this mark on or in relation to a product is an assurance that the goods have been produced to comply with the requirements of the British
44、Standard under a system of supervision, control and testing operated during manufacture and including periodical inspection at the manufacturers works in accordance with the certification mark scheme of BSI. Further particulars of the terms of licence may be obtained from the Director General, Briti
45、sh Standards Institution, 2 Park Street, London, W.1. 3) BS325,”Black cup and countersunk bolts and nuts”. Rail Fishbolt details Nut details BS ref. No. Nominal weight Diameter Length Length of thread Number of threads per inch (B.S.W) Depth of square neck lb/yd in mm in mm in mm in mm 16M (FB) 20M
46、(FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 3 / 8 1 / 2 1 / 2 5 / 8 5 / 8 9.52 12.7 12.7 15.87 15.87 1 3 / 4 2 2 2 1 / 4 2 1 / 4 44.45 50.8 50.8 57.15 57.15 1 1 1 1 1 / 4 1 1 / 4 25.4 25.4 25.4 31.75 31.75 16 12 12 11 11 0.281 0.375 0.375 0.469 0.469 7.14 9.52 9.52 11.91 11.91 Black square nuts t
47、o BS325 a a The dimensions of these nuts are the same as those in BS916, “Black bolts, screws and nuts”.BS 248:1969 12 BSI 06-1999 See Table 6 belowBS 248:1969 BSI 06-1999 13 Table 6 Dimensions of fishplates for light flat bottom rails Rail A B C D R r BS ref. No. Nominal weight Nominal Tolerance No
48、minal Tolerance Nominal Tolerance lb/yd Dimensions in inches 16M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 3 / 8 7 / 16 7 / 16 1 / 2 1 / 2 1 / 64 1 7 / 16 1 19 / 32 1 11 / 16 1 13 / 16 1 29 / 32 + 3 / 64 0 1 1 / 4 1 3 / 8 1 15 / 32 1 9 / 16 1 21 / 32 + 3 / 64 0 3 / 32 7 / 64 7 / 64 1 /
49、 8 1 / 8 3 / 16 rad. 1 / 16 rad. Metric equivalents (mm) 16M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 9.52 11.11 11.11 12.7 12.7 0.4 36.51 40.48 42.86 46.04 48.42 +1.19 0 31.75 34.93 37.31 39.69 42.07 +1.19 0 2.38 2.78 2.78 3.17 3.17 4.76 rad. 1.59 rad.BS 248:1969 14 BSI 06-1999 See Table 7 belowBS 248:1969 BSI 06-1999 15 Table 7 Position and dimension of holes in fishplates for light flat bottom rails Rail Tolerances in 3 / 64 3 / 64 + 3 / 32 0 BS ref. No. Nominal weight
