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1、BRITISH STANDARD MARINE SERIES CONFIRMED AUGUST 1980 BS MA 39-2:1973 Specification for Ships ladders Part 2: Ladders, steel sloping UDC 629.12.011.57:69.026.238 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
2、S MA 39-2:1973 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
3、 Draft for comment 72/39231 DC ISBN 0 580 07809 4 Foreword This Part of this British Standard has been prepared under the authority of the Shipbuilding and Marine Industry Standards Committee and is based on a proposal submitted by the British Ship Research Association. It forms Part 2 of a series d
4、ealing with the particular requirements of ships ladders. Other parts in the series are as follows: Part 1: Ladders, steel vertical; Part 3: Ladders, steel, dog-step; Part 4: Ladders, wood sloping. This standard makes reference to the following publications: BS 499, Welding terms and symbols Part 2:
5、 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. BS 4592, Industrial type metal flooring and stair treads. NOTEAttention is drawn to certification faciliti
6、es offered by BSI; 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 fr
7、om legal obligations. 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 amendm
8、ent table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-2:1973 BSI 02-2000i Contents Page ForewordInside front cove
9、r 1Scope1 2Definitions1 3Materials1 4Design and construction1 5Quality of manufacture and finish1 6Inspection2 Figure 1 Steel sloping ladder2 Figure 2 Detail of tread connection3 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontroll
10、ed Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-2:1973 BSI 02-20001 NOTEUsers of this British Standard, Marine Series, should note that while observing the requirements of the
11、 standard, they should at the same time ensure compliance with such statutory rules and regulations as may be applicable to the individual ship concerned. 1 Scope 1.1 This Part of BS MA 39 specifies the materials, design and construction, quality of manufacture, finish, inspection and testing for sh
12、ips steel sloping ladders. 1.2 Sloping steel ladders are intended to be used for access between adjacent deck levels where ease of ascent and descent is required. Such ladders may be used in interior and exterior locations and are normally provided with a hand rail or rails for safety purposes. The
13、hand rail does not form part of this standard. 2 Definitions The following definitions shall apply: 2.1 ladder a construction, consisting of two stringers connected by treads to permit movement of personnel from one level to another 2.2 stringers the side members of a ladder to which the treads are
14、attached 2.3 treads horizontal members of a ladder 3 Materials The stringers and treads of the ladder shall be manufactured from weldable quality carbon steel conforming to the requirements of BS 4360, Grade 43A. Other steels may be used provided that they have equivalent weldable and mechanical pro
15、perties. When open steel flooring treads are used they shall also conform to the requirements of BS 4360 Grade 43A. 4 Design and construction 4.1 Ladders Ladders shall be constructed in accordance with Figure 1 and Figure 2. 4.2 Stringers 4.2.1 The stringers shall be straight and parallel throughout
16、 their length and inclined at a recommended angle of 55 to the horizontal. The distance between stringers shall be 600 mm, 700 mm or 800 mm. 4.2.2 Pairs of stringers shall be identical, differences in deck camber or sheer being accommodated by the method of attachment, for example, by increasing the
17、 height of the outboard deck lug in way of camber. 4.3 Treads 4.3.1 Treads shall be formed from either steel plate or, when specified, of open steel flooring pattern, and shall be 600 mm, 700 mm or 800 mm in length as appropriate. 4.3.1.1 Plate treads shall be of the form and dimensions shown in Fig
18、ure 2, and of self draining raised pattern plate, the thickness of the plate being measured at the plain surface, excluding pattern depth. 4.3.1.2 Open steel flooring treads shall conform with the requirements of BS 4592. 4.3.2 Treads shall be horizontal throughout their length. 4.3.3 Treads shall b
19、e spaced between levels at equal intervals of between 220 mm minimum and 250 mm maximum, these intervals being measured at the centre line of the ladder. 4.3.4 The ladder shall be so installed that the distance of the bottom step and top step from their respective access levels is equal to the spaci
20、ng of the other steps. 4.3.5 Plate treads (see 4.3.1.1) 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 thickness and not
21、leg length. 4.3.6 The welding of the treads shall be properly carried out by an experienced operator, in accordance with BS 1856. 4.3.7 The welded treads shall be capable of withstanding a load of 900 N at the centre of the span and the maximum deflection of the tread when subjected to this load sha
22、ll not exceed 1 mm. 4.4 Installation 4.4.1 Ladders may be bolted or welded to the supporting structure as required. 4.4.2 The minimum distance between stringers and supporting structure shall be 10 mm. 5 Quality of manufacture and finish 5.1 Ladders shall be straight with a minimum of distortion. 5.
23、2 Ladders shall be free from defects and imperfections (burrs, weld-scar, sharp edges, etc.) liable to cause injury to persons using the ladders. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-2:1973
24、2 BSI 02-2000 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 BS 729. 6 Inspection The ladder shall be subjected to visual inspection for freedom from d
25、efects and imperfections (see 5.1 and 5.2). Figure 1 Steel sloping ladder Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-2:1973 BSI 02-20003 Figure 2 Detail of tread connection Licensed Copy: London S
26、outh Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:16:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 39-2:1973 BSI 02-2000 BSI Certifi
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