ASTM A640-1997(2002)e1 Standard Specification for Zinc-Coated Steel Strand for Messenger Support of Figure 8 Cable《8字型缆吊架用镀锌钢绞线的标准规范》.pdf
《ASTM A640-1997(2002)e1 Standard Specification for Zinc-Coated Steel Strand for Messenger Support of Figure 8 Cable《8字型缆吊架用镀锌钢绞线的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A640-1997(2002)e1 Standard Specification for Zinc-Coated Steel Strand for Messenger Support of Figure 8 Cable《8字型缆吊架用镀锌钢绞线的标准规范》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 640 97 (Reapproved 2002)e1Standard Specification forZinc-Coated Steel Strand for Messenger Support of Figure 8Cable1This standard is issued under the fixed designation A 640; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTESeveral editorial corrections were made throughout the specification in September 2002.1. Scope1.1 This
3、specification covers two sizes of extra-high-strength grade of concentric-lay steel wire strand, composed ofseven, zinc-coated steel wires, specifically intended for use asthe supporting messenger in Figure 8-type communication andelectrical cables.1.2 The values stated in inch-pound units are to be
4、 regardedas the standard.2. Referenced Documents2.1 ASTM Standards:A 90/A 90M Test Method for Weight of Coating on Zinc-Coated (Galvanized) Iron or Steel Articles2A 902 Terminology Relating to Metallic Coated Steel Prod-ucts2B 6 Specification for Zinc (Slab Zinc)33. Terminology3.1 DefinitionsSee Ter
5、minology A 902 for definitions ofgeneral terminology relating to metallic coated steel products.4. Description4.1 Figure 8 cable consists of a plastic-sheathed communi-cation or electrical cable made with an integral supportingmessenger strand. The supporting messenger strand has aplastic sheath wit
6、h a narrow, longitudinal web connecting tothe plastic sheath of the cable. Generally the plastic sheath overthe supporting strand, the connecting web, and the plasticsheath over the cable are all applied by extruding in oneoperation.4.2 The galvanized steel strand used for the support mes-senger of
7、Figure 8-type cable is generally coated by floodingwith a sealing compound before the plastic sheath is applied(Note). It is generally preferred that this sealing compound beapplied to the individual wires during the stranding operationjust before the wires are laid together. This ensures that allwi
8、res are completely covered and the interstices between thewires are sealed with a thermoplastic flooding compound toprevent intrusion of moisture under the plastic sheath. Some-times the thermoplastic material is only applied to the outsideof the finished strand.NOTE 1The cable manufacturer should a
9、dvise the strand manufac-turer of the plastic to be used for the sheath so that a sealing compound canbe selected to avoid any adverse effects on the sheath.5. Ordering Information5.1 Orders for material under this specification shall includethe following information:5.1.1 Nominal strand diameter (T
10、able 1),5.1.2 Quantity of each size of strand, length in feet (metres),5.1.3 Unit length (see 16.1),5.1.4 Sealing compound, if required, and the method ofapplication. Special requirements of sealing compound (Note),5.1.5 Package size if different from standard (Section 16),5.1.6 Special package mark
11、ing (see 16.4), and5.1.7 Inspection (Section 14).6. Materials and Manufacture6.1 The base metal of the wires shall be steel made by theopen-hearth, basic-oxygen, or electric-furnace process and ofsuch quality and purity that, when drawn to the size of wirespecified and coated with zinc, the finished
12、 strand and theindividual wires shall be of uniform quality and have theproperties and characteristics as prescribed in this specifica-tion.6.2 The slab zinc, when used for the wire coating, shall beany grade of zinc conforming to Specification B 6.7. Stranding7.1 Six wires shall be stranded with a
13、uniform left-hand layabout a center wire to form the completed strand. All wiresshall be stranded with uniform tension. Stranding shall be1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.
14、12 on Wire Specifications.Current edition approved April 10, 1997. Published December 1997. Originallypublished as A 640 71. Last previous edition A 640 91.2Annual Book of ASTM Standards, Vols 01.06 and 02.03.3Annual Book of ASTM Standards, Vols 02.03 and 02.04.1Copyright ASTM International, 100 Bar
15、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.sufficiently close to ensure no appreciable reduction in diam-eter when stressed to 10 % of the specified strength. A left-handlay is defined as a counter-clockwise twist away from theobserver.7.2 The strand shall have a un
16、iform pitch of not less than 14times nor more than 22 times the nominal strand diameter.7.3 All wires in the strand shall lie naturally in their truepositions in the completed strand and, when the strand is cut,the ends shall remain in position or be readily replaced by handand then remain in positi
17、on. This shall be accomplished by ameans or process, such as preforming, post forming, or formsetting at the manufacturers option.8. Joints and Splices8.1 Electric-welded butt joints made prior to the start of colddrawing of the wire are permitted.8.2 Joints made in the individual finished wires sha
18、ll beacceptable, provided there is not more than one joint in any150-ft (45.7-m) section of the completed strand. Such jointsshall either be the brazed-lap type or electric-butt-welded type.When the brazed type of joint is used, the length of the lap shallbe not less than three times the diameter of
19、 the wire and theoverlapping faces shall be smooth, clean, properly fluxed, andcompletely covered by the brazing metal. When the electric-butt-welded type of joint is used, care shall be taken to preventinjury to the wire during the electric-butt-welding. The wiresshall be in alignment and the joint
20、s shall be well made and freefrom sharp burrs and sharp projections. The joints shall becoated with zinc after completion so that the joints shall haveprotection from corrosion equivalent to that of the zinc-coatedwire itself.8.3 The finished strand shall not be joined or spliced as aunit, unless sp
21、ecifically permitted by the purchaser.9. Physical Requirements9.1 The minimum breaking strength and minimum elonga-tion in 24 in. (610 mm) of the strand and the nominal diameterof individual wires are given in Table 1. The approximateweights per 1000 ft (305 m) are given in Table 2.9.2 Ductility of
22、SteelThe individual wires of the com-pleted strand shall not fracture when wrapped at a rate of notexceeding 15 turns/min in a close helix of at least two turnsaround a cylindrical mandrel equal to three times the nominaldiameter of the wire under test.9.3 Weight of CoatingThe weight of zinc coating
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