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1、BRITISH STANDARD BS 1139-1.1: 1990 Metal scaffolding Part 1: Tubes Section 1.1 Specification for steel tube BS 1139-1.1:1990 This British Standard, having been prepared under the direction of the Civil Engineering and Building Structures Standards Policy Committee, was published under the authority
2、of the Board of BSI and comes into effect on 31 October 1990 BSI 01-1999 First published as BS 1139 November 1943 Second edition November 1951 Third edition June 1964 Fourth edition, as BS 1139-1, April 1982 Fifth edition, as BS 1139-1.1, October 1990 The following BSI references relate to the work
3、on this standard: Committee reference CSB/57 Draft for comment 87/15200 DC ISBN 0 580 18673 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Civil Engineering and Building Structures Standards Policy Committee (CSB/-) to Technical Commi
4、ttee CSB/57, upon which the following bodies were represented: Association of Consulting Engineers Association of Consulting Scientists British Constructional Steelwork Association Ltd. British Steel Industry Building Employers Confederation Concrete Society Construction Health and Safety Group Cons
5、truction Industry Training Board Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association English Net Manufacturers Association Federation of Civil Engineering Contractors Health and Safety Executi
6、ve Institute of Building Control Institution of Civil Engineers Institution of Structural Engineers National Association of Formwork Contractors National Association of Scaffolding Contractors National Federation of Master Steeplejacks and Lightning Conductor Engineers Prefabricated Aluminium Scaffo
7、lding Manufacturers Association Suspended Access Equipment Manufacturers Association Amendments issued since publication Amd. No.Date of issueComments BS 1139-1.1:1990 BSI 01-1999i Contents Page Committees responsibleInside front cover Forewordii 0Introduction1 1Object and field of application1 2Ref
8、erences1 3Terminology1 4Steel1 5Manufacture1 6Delivery conditions2 7Testing and certification2 8EN designation3 9Marking3 Annex A (Mandatory) Requirements and quality control of the zinc coating4 Annex B (Mandatory) Requirements and quality control of the paint coating4 Annex C (Informative) Values
9、for the design of structures7 Figure 1 Maximum deviation of a tube from straight2 Figure 2 Single cutting tool6 Figure 3 Multiple cutting tool6 Table 1 Determination of chemical composition of steel by ladle analysis1 Table 2 Mechanical properties1 Table 3 Nominal dimensions, mass and tolerances for
10、 tubes2 Table 4 Classification of test results7 Publications referred toInside back cover BS 1139-1.1:1990 ii BSI 01-1999 Foreword This Section of BS 1139 has been prepared under the direction of the Civil Engineering and Building Structures Standards Policy Committee. Together with BS 1139-1.2:1990
11、, it supersedes BS 1139-1:1982, which is withdrawn. This Section of BS 1139 is one of a series specifying requirements for the design, construction and testing of equipment for use in scaffolding and other temporary structures. It specifies requirements for steel tubing of the type traditionally use
12、d in tubular scaffolding and false-work. Recommendations for the design of tubular scaffolding structures are given in BS 5973 and BS 5974. This standard was previously published as Part 1 of BS 1139:1982 which also contained specifications for aluminium scaffold tube. With the exception of specifyi
13、ng one wall thickness only (i.e. 4 mm), this standard technically aligns with European Harmonization Document HD 1039. Tubing complying with this British Standard also complies with the requirements for type 4 only of HD 1039, and therefore can be classified and marked “EN 39” (see clauses 8 and 9).
14、 BS 1139 is now published in separate Parts and Sections as follows. Part 1: Tubes; Section 1.1: Specification for steel tube; Section 1.2: Specification for aluminium tube; Part 2: Couplers; Section 2.1: Specification for steel couplers, loose spigots and base plates for use in working scaffolds an
15、d falsework made of steel tubes (Identical with HD 74); Section 2.21): Specification for steel and aluminium couplers, fittings and accessories for use in tubular scaffolding; Part 3: Specification for prefabricated access and working towers; Part 4: Specification for prefabricated steel splitheads
16、and trestles; Part 52): Specification for materials, dimensions, design loads and safety requirements for service and working scaffolds made of prefabricated elements (Identical with HD 1000). A British Standard does not purport to include all the necessary provisions of a contract. Users of British
17、 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 inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover.
18、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. 1) In preparation: it will cover couplers, fittings and accessories not included in Section 2.1. Additional couplers have not yet bee
19、n harmonized. 2) In preparation. BS 1139-1.1:1990 BSI 01-19991 0 Introduction This Section of BS 1139 describes a tube intended for use in falsework and working scaffolds. Other very similar tubes are available, and to ensure that scaffolding tubes are able to be identified without doubt on the buil
20、ding site, there is a requirement for marking. Scaffolds or falsework using these tubes should be erected in accordance with sound national practice; in some countries this could restrict the choice of tube. Prefabricated steel scaffold components may be fabricated with these tubes, or others. The d
21、esign of such scaffolds will relate to the steel sections actually used in them. 1 Object and field of application This Section of BS 1139 specifies requirements for steel tube intended for use in falsework and in access and working scaffolds constructed with separate tubes and couplers. It has an o
22、utside diameter of 48,3 mm, and a wall thickness of 4,0 mm. It also specifies tests on protective coatings and gives values for the design of structures. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Terminology The tube is referred t
23、o as “type 4” tube and represents a wall thickness of 4,0 mm. 4 Steel 4.1 Chemical composition Tubes shall be manufactured from steel whose chemical composition shall be in accordance with Table 1. Table 1 Determination of chemical composition of steel by ladle analysis For steel treated with alumin
24、ium, the nitrogen content may be increased to a maximum of 0,015 %. For steel which is to be protected by hot dip galvanizing (see 6.1) the silicon content shall not exceed 0,05 %. The use of rimming steel is not permitted. 4.2 Mechanical properties The mechanical properties of the tube shall be in
25、accordance with Table 2. Table 2 Mechanical properties 5 Manufacture 5.1 General 5.1.1 The tube shall be produced by a seamless or welded process. If the method of manufacture of the tube is not specified in the order, the choice of the method shall be at the option of the tube manufacturer. 5.1.2 T
26、he tubes shall have a smooth external surface consistent with the method of manufacture. Surface imperfections are permissible provided that the tube dimensions remain within the tolerance limit specified in Table 3. 5.1.3 The tubes shall have a circular profile and any ovality shall not exceed the
27、tolerance limits on outside diameter specified in Table 3. Elements% Carbon 340 235 ElongationA 24 % (on Lo = 5,65 So)a a In accordance with BS 18 Lo = original gauge length of the tensile test piece. So = original cross-sectional area of the gauge length. BS 1139-1.1:1990 2 BSI 01-1999 5.1.4 The de
28、viation from straight shall not exceed 3 mm in any one metre and the maximum deviation over the full length L of the tube shall not exceed 0,002 L (see Figure 1). 5.1.5 The ends shall be cut square with the axis of the tube and shall be free from burrs. 5.2 Tube dimensions, mass and tolerances Tube
29、dimensions, mass and tolerances shall be in accordance with Table 3. Table 3 Nominal dimensions, mass and tolerances for tubes 6 Delivery conditions 6.1 Tubes may be delivered from the tube manufacturer as rolled or with a protective coating. Corrosion protection may be applied either by the tube ma
30、nufacturer, or separately later3). If tubes are to be delivered as rolled with a low silicon content (see 4.1), this shall be specified in the order. Where tubes are to be supplied with a temporary corrosion protection, this shall be specified in the order. 6.2 Where tubes are protected by hot dip g
31、alvanizing, the coating shall be in accordance with A.2. Where tubes are protected by a paint coating, the coating shall be in accordance with B.2. 7 Testing and certification 7.1 Testing and manufacturers control The tubes shall be subjected to tests and production control during manufacture in ord
32、er to verify that they comply with the requirements of clauses 4, 5 and 6. 7.2 Where tubes are hot dip galvanized, the effectiveness of the coating shall be assessed by testing in accordance with annex A. Where tubes are protected by a paint coating, the effectiveness of the coating shall be assesse
33、d in accordance with annex B. 7.3 These tests and manufacturers control are the respective responsibilities of the tube manufacturer and applier of the corrosion protection. 7.4 Certificate of compliance At the purchasers request in the order, the tube manufacturer, the protective coating applier or
34、 the supplier shall supply a certificate of compliance stating that the tubes comply with the requirements of this British Standard. Figure 1 Maximum deviation of a tube from straight TubeNominal values Tolerances “Type 4,0” Wall thickness4,0 mm 10,0 %a Outside diameter (including ovality) 48,3 mm 0
35、,5 mm Inside diameterb40,3 mm 2,6 mm Mass, single tube4,37 kg/m+ 12,0 % 8,0 % Mass, batches of tubes (10 tonnes or more) 4,37 kg/m 7,5 % a Upper tolerance: governed by the tolerance on the mass. Lower tolerance: wall thickness shall be at least 3,6 mm on type 4,0 tube; a tolerance of 15 % being allo
36、wed in isolated places over a length not exceeding 100 mm, but only if the decrease in thickness affects only the external surface. b The tolerances for the inside diameter shall also include the weld zone. 3) Tubes should be provided with a permanent protection against corrosion before being put in
37、to use in falsework or scaffolds. BS 1139-1.1:1990 BSI 01-19993 8 EN designation The EN designation shall comprise the following items according to the denomination scheme: e.g. for a welded steel tube with a low silicon content, 4,0 mm wall thickness and hot dip galvanized: 9 Marking The marking sh
38、all be legible after the protective coating has been applied4). Tubes shall be marked by impressing at intervals not exceeding 1,5 m. The height of the characters shall be at least 4 mm and the impression at least 0,2 mm deep. When tubes are delivered from the tube manufacturer as rolled, the tubes
39、shall be marked in the as rolled condition. The marking shall show the name or trade mark of the tube manufacturer; the EN number “39”, the letter “A” or “B” for silicon content as appropriate; the nominal wall thickness “4”, which shall not be positioned immediately adjacent to the number “39”. Aft
40、er application of the protective coating an additional durable mark shall be applied to the tubes at intervals not exceeding 1,5 m showing the name or trade mark of the coating applier. NOTEThe marking in the as rolled condition gives no information about the application of any protective coating. 4
41、) Tubes should be marked before being put into use in falsework or scaffolds. BS 1139-1.1:1990 4 BSI 01-1999 Annex A (Mandatory) Requirements and quality control of the zinc coating A.1 Object and field of application This annex specifies the quality of the zinc coating of hot-dip galvanized steel t
42、ubes complying with this British Standard, the tests for checking compliance with these requirements. A.2 Characteristics of the coating A.2.1 Appearance The coating shall be uniform without gaps in the layer of zinc. It shall be free from spikes, which may be removed mechanically. A.2.2 Thickness o
43、f the coating When tested in accordance with A.3.2, the thickness of the coating shall be not less than 40 m. The thickness test shall be carried out on the outside only. A.2.3 Continuity of the coating The continuity of the coating shall be considered satisfactory if tubes having any visually suspe
44、ct spots meet the requirements of A.3.2. A.3 Testing A.3.1 Appearance of the coating The coating shall be examined visually and manually to ensure that it complies with A.2.1. A.3.2 Thickness of the coating A.3.2.1 Choice of method The coating thickness may be assessed by either the magnetic method
45、or the gravimetric method. If a particular method is not specified in the order, the choice of method shall be at the option of the tube manufacturer or galvanizer. A.3.2.2 Magnetic method A.3.2.2.1 Principle The thickness is assessed by measuring the influence of the zinc coating on a magnetic fiel
46、d. The test should be conducted in accordance with BS 5411-11, and only the main significant points are given here. A.3.2.2.2 Equipment The instrumentation chosen shall be appropriate for the size of tube and coating thickness specified. A.3.2.2.3 Calibration The instrument shall be calibrated on a
47、piece of ungalvanized tube, and rechecked frequently during use. A.3.2.2.4 Procedure Using the same technique as was used in the calibration, take 10 readings spread over the surface of the tube under examination. A.3.2.2.5 Accuracy Calibration and operation of the instrument shall be such that the
48、coating thickness can be determined within 10 % of its true thickness. A.3.2.3 Gravimetric method A.3.2.3.1 Principle The thickness is assessed by measuring the mass of the zinc coating on a surface of known area and calculating the average thickness of zinc. A.3.2.3.2 Procedure The test shall be ca
49、rried out in accordance with BS 729 using a sample tube cut from a hot dip galvanized tube. Annex B (Mandatory) Requirements and quality control of the paint coating B.1 Object and field of application This annex specifies methods of test and criteria for quality control of the protective paint coating on the outside of steel tubes complying with this British Standard, and acceptable limits. It is applicable to tubes immediately after painting and drying. Time and temperature should be recorded. It gives a test