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1、BRITISH STANDARD MARINE SERIES CONFIRMED MAY 1986 BS MA 39-1:1973 Specification for Ships ladders Part 1: Ladders, steel vertical UDC 629.12.011.57:69.026.233 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
2、MA 39-1:1973 This British Standard, having been approved by the Shipbuilding and Marine Industry Standards Committee, was published under the authority of the Executive Board on 21 December 1973 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference SME/2 D
3、raft for comment 72/39232 DC ISBN 0 580 08043 9 Foreword This Part of this British Standard has been prepared under the authority of the Shipbuilding and Marine Industry Standards Committee and has been developed from a proposal submitted by the British Ship Research Association. It forms Part 1 of
4、BS MA 39, “Ships ladders” and deals with the particular requirements for steel vertical ladders. Other parts in the series are as follows: Part 2: Ladders, steel sloping; Part 3: Ladders, steel dog-step; Part 4: Ladders, wood sloping. This standard makes reference to the following publications: BS 4
5、99, Welding terms and symbols Part 2: Symbols for welding. BS 729, Hot dip galvanized coatings on iron and steel articles. BS 1856, General requirements for the metal-arc welding of mild steel. BS 4360, Weldable structural steels. NOTEAttention is drawn to the certification facilities offered by BSI
6、; see the inside back 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 obligati
7、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, 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
8、inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-1:1973 BSI 02-2000i Contents Page ForewordInside front cover 1Scope1 2Defini
9、tions1 3Materials1 4Design and construction1 5Quality of manufacture and finish2 6Inspection2 Figure 1 Vertical steel ladder2 Figure 2 Detail of rung connection3 Figure 3 Alignment of ladder sections3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+
10、00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-1:1973 BSI 02-20001 NOTEUsers of this British Standard, Marine Series, should note that while observing t
11、he requirements of the standard, they should at the same time ensure compliance with such statutory requirements rules and regulations as may be applicable to the individual ship concerned. 1 Scope 1.1 This Part of BS MA 39 specifies the dimensions, design and construction, materials and finish for
12、general purpose steel vertical ladders. 1.2 Vertical ladders are those which are vertical or attached to the ship structure at an angle not exceeding 15 to the vertical, and are intended to be used for access to holds, tween decks cargo spaces, masts, kingposts, funnels, trunks, deckhouse tops, main
13、tenance platforms etc. 1.3 These ladders are not intended to be used where they are exposed to risk of excessive damage. 2 Definitions The following definitions shall apply: 2.1 ladder a construction, consisting of two stringers connected by rungs to permit movement of personnel from one level to an
14、other 2.2 stringers the side members of a ladder to which the steps are attached 2.3 rungs bars of square cross section 3 Materials The stringers and rungs of the ladder shall be manufactured from weldable quality carbon steel conforming to the requirements of BS 4360, Grade 43A. Other steels may be
15、 used provided that they have equivalent weldable and mechanical properties. 4 Design and construction 4.1 Ladders Ladders shall be constructed in accordance with Figure 1, Figure 2 and Figure 3. 4.2 Stringers 4.2.1 The stringers shall be straight and parallel throughout their length. 4.2.2 When pos
16、sible, stringers shall be continuous, but where constructed of more than one section, the ladders shall be so attached to the supporting structure such that the ends of the stringers are carefully aligned, to prevent injury to the hands, and are separated by a gap of not less than 3 mm nor more than
17、 5 mm. (See Figure 3.) 4.2.3 When it is necessary to fit a long ladder in sections, care shall be taken to ensure that the rung spacing between the ends of the sections, is equal to that of the rung spacing of the ladder. (See Figure 3.) 4.3 Rungs 4.3.1 Rungs of the ladder shall be horizontal throug
18、hout their length and fitted with their diagonals parallel to the stringer centre line. (See Figure 2.) 4.3.2 Rungs shall be spaced at intervals of 300 mm. 4.3.3 The ladder shall be so installed that the distance of the bottom rung above the lower access level is 300 mm and the distance of the top r
19、ung below the upper access level does not exceed 300 mm. 4.3.4 Rungs shall be connected to the stringers by continuous fillet weld as shown in Figure 2. The welding symbols used in Figure 2 are in accordance with BS 499-2 but the associated dimensions are expressed in terms of the weld throat thickn
20、ess and not of leg length. 4.3.5 The welding of the rungs shall be properly carried out by an experienced operator in accordance with BS 1856. The welded rungs shall be designed to withstand a point load of 1 450 N at the centre of the span; the deflection of the rung, when subjected to such a load,
21、 shall not exceed 0.25 mm. 4.4 Installation 4.4.1 Ladders may be welded or bolted to the supporting structure as required. 4.4.2 The distance between supporting attachments shall be 2 m to 2.5 m. For longer ladders requiring intermediate attachments, these shall be spaced at intervals of not more th
22、an 2.5 m throughout the length of the ladder. Where such attachments impinge upon rung positions, they shall be moved not more than 150 mm from their theoretical position. 4.4.3 Ladders shall be so located that the minimum foot clearance between rung centre and supporting structure is 150 mm. Licens
23、ed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-1:1973 2 BSI 02-2000 5 Quality of manufacture and finish 5.1 Ladders shall be straight with a minimum of distortion. 5.2 Ladders shall be free from defects and
24、 imperfections (burrs, weldscar, sharp edges etc.) liable to cause injury to persons using the ladders. 5.3 Ladders shall be given a protective finish appropriate to their location on the ship. 5.4 When ladders are required to be galvanized, they shall be coated after manufacture in accordance with
25、BS 729. 6 Inspection The ladder shall be subjected to visual inspection for freedom from defects and imperfections. (See 5.1 and 5.2.) Figure 1 Vertical steel ladder Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c)
26、BSI BS MA 39-1:1973 BSI 02-20003 Figure 2 Detail of rung connection Figure 3 Alignment of ladder sections Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: London South Bank University, Lon
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