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1、BRITISH STANDARD BS 248:1969 Specification for Light rails and fishplates For use at mines Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 This British Standard, having been approved by the Mining and Quarrying Requisites Industr
2、y Standards Committee, was published under the authority of the Executive Board on 30 January 1969 BSI 06-1999 First 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 c
3、omment 67/23143 ISBN 580 00430 9 Co-operating organizations The Mining and Quarrying Requisites Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations:
4、Association of Mining Electrical and Mechanical Engineers British Electrical and Allied Manufacturers Association British Steel Industry* Federation of Associations of Mining Equipment Manufacturers Institution of Electrical Engineers Institution of Mechanical Engineers Institution of Mining Enginee
5、rs* Mechanical Handling Engineers Association Ministry of Power* National Association of Colliery Managers National 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
6、British Standard: Steel Arch and Light Rail Association Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-1999i Contents Page Co-operating organizationsInside front co
7、ver Forewordii 1Scope1 2Rails1 3Fishplates11 4Fishbolts11 Figure 1 Location of tensile test piece1 Table 1 Dimensions of light flat bottom rails4 Table 2 Dimensions of light bridge rails6 Table 3 Position of bolt holes at end of rails8 Table 4 Position and dimensions of nail holes in flat bottom rai
8、ls10 Table 5 Dimensions of fishbolts and nuts11 Table 6 Dimensions of fishplates for light flat bottom rails13 Table 7 Position and dimension of holes in fishplates for light flat bottom rails15 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BS
9、I BS 248:1969 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 standar
10、ds to which they refer. A complete list of British Standards, numbering over 5000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook, price 15s. The BS Yearbook may be consulted in many public libraries and similar institutions. This standard make
11、s reference 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 BS 248, which was issued with the authority of the Mining and Quarrying Requisite
12、s Industry Standards 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 provid
13、ed for guidance, 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 BS 350, “Conversion factors and tables”. A Britis
14、h 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 pages This document comprises a front
15、cover, an inside front cover, pages i and ii, pages 1 to 16 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. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29
16、02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-19991 1 Scope This British Standard specifies requirements 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
17、 sections shall be rolled to the dimensions given in Table 1 for light flat bottom rails and in Table 2 for light bridge rails. 2.2 Material. The finished rail shall be of prime or re-rolled steel. The sulphur and phosphorus content shall not exceed 0.060 % of each element. 2.3 Tensile test and test
18、 pieces. If the purchaser requires the tensile properties of the steel, they shall be determined in accordance with BS 181), using standard round tensile test pieces having a gauge length equal to 5.65So and a diameter equal to 0.564 in or 0.399 in. Such tests shall be made on a standard test piece
19、taken from a position as shown in Figure 1. 2.4 Tensile properties. The test shall show that the steel has a minimum tensile strength of 35 tonf/in2 (54 hbar2) and a minimum elongation of 12 %. 2.5 Number of tensile tests. If required by the purchaser the manufacturer shall make one tensile test fro
20、m every 25 tons (25.4 tonnes), or part of 25 tons of rails rolled. 2.6 Branding. The BS section reference number, the manufacturers 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 (19 mm) high, or as near to th
21、is figure as is practicable for the particular rail section. Re-rolled rails shall be additionally identified by the letters “RR”. 2.7 Finish. All rails shall be of uniform section, straight, free from twist, sound and clean. 1) BS 18, “Methods for tensile testing of metals”. Figure 1 Location of te
22、nsile test piece 2) 1 hbar = 10 N/mm2= 0.647 49 tonf/in2 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 2 BSI 06-1999 2.8 Permissible variation in dimensions. The rail profiles shall be within the following tolerances: 2.9 Sawin
23、g. 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 supplied. The manufacturer shall have the option of supplyi
24、ng, and the purchaser shall accept, shorter lengths up to 7 % 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 the following tolerance on specified length, at a temp
25、erature of 20 C: 2.12 Calculated weight. The weights of rail quoted in this British Standard have been determined by multiplying the sectional area (in2) by a factor of 10.209 to give the weight in pounds per yard. The calculated weight shall be regarded as the actual weight unless otherwise agreed.
26、 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, the holes may be drilled. All holes shall be clean a
27、nd 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 of 3 ft (0.914 m). For other rail lengths the nail ho
28、le pitches shall be stated by the purchaser. The variation in rail length, within the appropriate tolerance specified in 2.11, shall be accommodated in one of the end 3 ft pitches. Nail holes shall, at one stroke of the machine, be punched parallel with the vertical axis of the rail. Alternatively,
29、the holes may be drilled. All holes shall be clean and free from burrs. 1) Overall height of rail 1/32 in (0.8 mm). 2) Width of head 1/32 in (0.8 mm). 3) Width of flange+ 1/32 in (0.8 mm). 1/16 in (1.6 mm). Length up to and including 24 ft (7.3 m) in ( 12.7 mm) Length exceeding 24 ft (7.3 m) 1 in (
30、25.4 mm) Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-19993 See Table 1 below Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 4 BSI 06-1999 Table 1
31、Dimensions of light flat bottom rails BS ref. No. Nominal weight of rail ABCDEFGHJKLM Area of section Calculated weight lb/ydDimensions in inches in2 lb/yd 16M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 21/16 23/16 21/2 23/4 3 25/64 31/64 17/32 19/32 39/64 3/4 25/32 7/8 15/16 13/32 13/3
32、2 17/32 13/8 11/2 111/16 25/16 29/16 23/4 231/32 33/16 1/4 17/64 21/64 23/64 23/64 3/16 1/4 5/16 5/16 5/16 1/8 3/16 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)cm2kg
33、/m 16M (FB) 20M (FB) 25M (FB) 30M (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.
34、59 1.59 1.59 1.59 1.59 1.59 1.59 1.59 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 17.42 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-19995 See Table 2 below Licensed Copy: sheffieldun she
35、ffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 6 BSI 06-1999 Table 2 Dimensions of light bridge rails BS ref. No. Nominal weight of rail ABCDFGHJKLM Area of section Calculated weight lb/yd Dimensions in inchesin2lb/yd 14M (B) 18M (B) 22M (B) 14 18 22 27/8 3
36、3 1 11/16 13/32 11/2 111/16 2 9/16 5/8 1 1/4 9/32 9/32a 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 Metric equivalents (mm)cm2kg/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
37、.35 7.14 7.14a 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 this rail tapers from 19/64 in (7.54 mm) to 17/64 in (6.75 mm) at the toe. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov
38、 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-19997 See Table 3 below Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 8 BSI 06-1999 Table 3 Position of bolt holes at end of rails BS ref. No. Nominal w
39、eight of rail Tolerances in 1/16 1/8 0 1/16 NDia. of fishbolts mm1.59 3.17 0 1.59 JKLM lb/ydDimensions in inches 16M (FB) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 16 20 25 30 35 Nominal gap 1/4 15/8 1/2 5/8 5/8 3/4 3/4 31/2 31/32 11/8 113/64 15/16 111/32 3/8 1/2 1/2 5/8 5/8 Metric equivalents (mm) 16M (F
40、M) 20M (FB) 25M (FB) 30M (FB) 35M (FB) 6.3541.27 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 15.87 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-19999 See Table 4 below Licensed C
41、opy: sheffieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 10 BSI 06-1999 Table 4 Position and dimensions of nail holes in flat bottom rails BS ref. No. Width of flangeHole centresHole diameter ANBTolerance Dimensions in inches 16M 20M 25M 30M 35M 21
42、/16 23/16 21/2 23/4 3 13/8 13/8 15/8 17/8 21/8 3/8 3/8 1/2 1/2 1/2 + 1/32 0 Metric equivalentsOther 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 12.7 12.7 12.7 + 0.8 0 ft 3 in 0 15/8 7/8 3/4 0.914 m 41.27 mm 22.22 mm 19.05 mm Licensed Copy: shef
43、fieldun sheffieldun, na, Wed Nov 29 02:29:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 248:1969 BSI 06-199911 3 Fishplates 3.1 Material. The finished fishplates shall be of steel having a tensile strength of 24 tonf/in2 to 35 tonf/in2 (37 hbar to 54 hbar) and a minimum elongation of 20 %. 3.2 Di
44、mensions. The 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
45、 shall at one 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 dimension
46、s specified in Table 5. They shall comply with the provisions of BS 3253), except for the length of thread of the ); in (9.52 mm) 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,
47、enclosed in the 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 o
48、f the British 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
49、General, British Standards Institution, 2 Park Street, London, W.1. 3) BS 325,”Black cup and countersunk bolts and nuts”. RailFishbolt details Nut details BS ref. No. Nominal weight DiameterLength Length of thread Number of threads per inch (B.S.W) Depth of square neck lb/ydinmminmminmminmm 16M (FB) 20M (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 13/4 2 2 21/4 21/4 44.45 50.8 50.8 57.15 57.15 1 1 1 11/4 11/4 25.4 25.4 25.4 31.75 31.75 16 12 12 11 11 0.28
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