1、Designation: A 762/A 762M 00American Association State Highway andTransportation Officials StandardAASHTO No. M 245/M 245 MStandard Specification forCorrugated Steel Pipe, Polymer Precoated for Sewers andDrains1This standard is issued under the fixed designationA762/A762M; the number immediately fol
2、lowing the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been app
3、roved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers polymer precoated corrugatedsteel pipe intended for use for storm water drainage, underd-rains, the construction of culverts, and similar uses. Pipecovered by this specification is not normally used for thec
4、onveyance of sanitary or industrial wastes. The steel sheetused in fabrication of the pipe has a polymer protective coatingover a metallic coating of zinc, 55 % aluminum-zinc alloy, orzinc-5 % aluminum-mischmetal alloy.1.2 The polymer precoating provides extra protection of thebase metal against cor
5、rosion or abrasion, or both, in addition tothat provided by the metallic coating. Some severe environ-ments may cause corrosion problems to accessory items suchas rivets or coupling band hardware that does not have apolymer coating. Additional protection for polymer precoatedcorrugated steel pipe ca
6、n be provided by use of coatingsapplied after fabrication of the pipe as described in Specifica-tion A 849.1.3 This specification does not include requirements forbedding, backfill, or the relationship between earth cover loadand sheet thickness of the pipe. Experience has shown that thesuccessful p
7、erformance of this product depends upon theproper selection of sheet thickness, type of bedding andbackfill, controlled manufacture in the plant, and care in theinstallation. The installation procedure is described in PracticeA 798.1.4 This specification is applicable to orders in eitherinch-pound u
8、nits as A 762, or in SI units as A 762M.Inch-pound units and SI units are not necessarily equivalent. SIunits are shown in brackets in the text for clarity, but they arethe applicable values when the material is ordered to A 762M.2. Referenced Documents2.1 ASTM Standards:A 90/A 90M Test Method for W
9、eight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy Coatings2A 153/A 153M Specification for Zinc Coating (Hot-Dip) onIron and Steel Hardware2A 307 Specification for Carbon Steel Bolts and Studs,60 000 psi Tensile Strength3A 449 Specification for Quenched and Tempered SteelBolts a
10、nd Studs3A 493 Specification for Stainless and Heat-Resisting SteelWire for Cold Heading and Cold Forging4A 563 Specification for Carbon and Alloy Steel Nuts3A 563M Specification for Carbon and Alloy Steel NutsMetric3A 742/A 742M Specification for Steel Sheet, Metallic-Coated, and Polymer Precoated
11、for Corrugated Steel Pipe2A 760/A 760M Specification for Corrugated Steel Pipe,Metallic Coated for Sewers and Drains5A 780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized Coatings2A 796/A 796M Practice for Structural Design of Corru-gated Steel Pipe, Pipe-Arches, and Arches fo
12、r Storm andSanitary Sewers and Other Buried Applications2A 798/A 798M Practice for Installing Factory-Made Corru-gated Steel Pipe for Sewers and Other Applications2A 849 Specification for Post-Applied Coatings, Pavings,and Linings for Corrugated Steel Sewer and DrainagePipe2A 929/A929M Specification
13、 for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe2B 633 Specification for Electrodeposited Coatings of Zincon Iron and Steel6B 695 Specification for Coatings of Zinc MechanicallyDeposited on Iron and Steel6C 443 Specification for Joints for Circular Concrete Sewer1Th
14、is specification is under the jurisdiction of ASTM Committee A05 onMetallic Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.17 on Corrugated Steel Pipe Specifications.Current edition approved June 10, 2000. Published September 2000. Originallypublished as A 762 79.
15、 Last previous edition A 762/A 762M 98.2Annual Book of ASTM Standards, Vol 01.06.3Annual Book of ASTM Standards, Vol 15.08.4Annual Book of ASTM Standards, Vol 01.03.5Annual Book of ASTM Standards, Vol 06.01.6Annual Book of ASTM Standards, Vol 02.05.1Copyright ASTM International, 100 Barr Harbor Driv
16、e, PO Box C700, West Conshohocken, PA 19428-2959, United States.and Culvert Pipe, Using Rubber Gaskets7D 1005 Test Methods for Measurement of Dry-Film Thick-ness of Organic Coatings Using Micrometers5D 1056 Specification for Flexible Cellular MaterialsSponge or Expanded Rubber8F 568M Specification f
17、or Carbon andAlloy Steel ExternallyThreaded Metric Fasteners32.2 AASHTO Standard:T 249 Test for Helical Lock Seam Corrugated Pipe93. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fabricator, nthe producer of the pipe.3.1.2 manufacturer, nthe producer of the sheet.3.1.3 minimize
18、d coating structure, na coating character-ized by a finer metallurgical coating structure obtained by atreatment designed to restrict the formation of the normalcoarse grain structure formed during solidification of the Zn-5Al-MM alloy coating.3.1.4 purchaser, nthe purchaser of the finished product.
19、3.1.5 regular coating structure, nthe normal coatingstructure resulting from unrestricted grain growth during nor-mal solidification of the Zn-5 Al-MM alloy coating.3.2 Abbreviations:Abbreviations:55 Al-Zn55 % aluminum-zinc.Zn-5 Al-MMzinc-5 % aluminum-mischmetal.MMmischmetal.4. Classification4.1 The
20、 corrugated steel pipe covered by this specification isclassified as follows:4.1.1 Type IThis pipe shall have a full circular cross-section, with a single thickness of corrugated sheet, fabricatedwith annular (circumferential) or helical corrugations.4.1.2 Type IAThis pipe shall have a full circular
21、 cross-section, with an outer shell of corrugated sheet and an innerliner of smooth (uncorrugated) sheet, fabricated with helicalcorrugations and lock seams.4.1.3 Type IRThis pipe shall have a full circular cross-section with a single thickness of smooth sheet, fabricated withhelical ribs projecting
22、 outwardly.4.1.4 Type IIThis pipe shall be a Type I pipe which hasbeen reformed into a pipe arch, having an approximately flatbottom.4.1.5 Type IIAThis pipe shall be a Type IApipe which hasbeen reformed into a pipe arch, having an approximately flatbottom.4.1.6 Type HRThis pipe shall be a Type IR pi
23、pe which hasbeen reformed into a pipe-arch, having an approximately flatbottom.4.1.7 Type IIIThis pipe, intended for use as underdrains orfor underground disposal of water, shall be a Type I pipe whichhas been perforated to permit the in-flow or out-flow of water.4.1.8 Type IIIAThis pipe, intended f
24、or use as underdrains,shall consist of a semicircular cross section, having a smooth(uncorrugated) bottom with a corrugated top shield.4.2 Perforations in Type III pipe are included in two classesas described in 8.3.2.4.3 Zn-5 Al-MM alloy coated material is available in twocoating classes, or struct
25、ures, as follows:4.3.1 Class AMinimized coating structure, and4.3.2 Class BRegular coating structure.5. Ordering Information5.1 Orders for material to this specification shall include thefollowing information as necessary, to adequately describe thedesired product.5.1.1 Name of material (polymer-coa
26、ted corrugated steelpipe),5.1.2 Grade of polymer coating indicating thickness oninside and outside (6.1),5.1.3 Type of metallic coating (zinc, aluminum, 55 Al-Znalloy, or Zn-5 Al-MM alloy) (6.1),5.1.4 ASTM designation and year of issue, as A 762-_ forinch-pound units or as A 762M_ for SI units,5.1.5
27、 Type of pipe (4.1),5.1.6 Diameter of circular pipe, Table 1, or span and rise ofpipe-arch section, Table 2 Table 3orTable 4 Table 5,5.1.7 Length, either total length or length of each piece andnumber of pieces,5.1.8 Description of corrugations (7.2),5.1.9 Sheet thickness (8.1.2),5.1.10 For Type I a
28、nd Type II pipe, the pipe fabricationmethod, whether with annular corrugations or helical corruga-tions (7.1.1),NOTE 1Pipe with annular corrugations with spot welded or rivetedseams is designed by different criteria compared to pipe with helicalcorrugations. Pipe with annular corrugations must consi
29、der seam strength.Therefore, consideration of the method of fabrication is important whenpipe is installed under certain conditions of loading.5.1.11 Coupling bands, number, and type (9.1) if specialtype is required,5.1.12 Gaskets for coupling bands, if required (9.3),5.1.13 For Type III pipe, class
30、 of perforations, if other thanClass 1 (8.3.2),5.1.14 Certification, if required (14.1), and5.1.15 Special requirements.6. Materials and Manufacture6.1 Steel Sheet for PipeAll pipe fabricated under thisspecification shall be formed from polymer precoated sheetconforming to Specification A 742/A 742M
31、.6.1.1 The grade of coating shall be stated in the order, andthe polymer thickness on both inside and outside of the pipe.The polymer coating is classified by grade corresponding to thethickness in mils (thousandths inch) on each side in inch-poundunits, and the thickness in micrometres on each side
32、 in SI units.Grade Coating Thicknessin. m10/10 250/250 0.010/0.010 250/2507Annual Book of ASTM Standards, Vol 04.05.8Annual Book of ASTM Standards, Vol 09.02.9Available from American Association of State Highway and TransportationOfficials, 444 N. Capitol, Washington, DC 20001.A 762/A 762M 0026.1.1.
33、1 Any combination of polymer coating thickness otherthan shown in 6.1.1 is subject to agreement between themanufacturer and the purchaser or fabricator.6.1.2 The polymer coating is applied to steel sheet having ametallic coating of zinc, 55 % aluminum-zinc alloy, orzinc-5 % aluminum-mischmetal alloy
34、, as described in Specifi-cations A 929/A 929M. The type of metallic coating should bestated in the order, consistent with thickness availability asshown in Table 6. If the type of metallic coating is not stated,zinc-coated sheet conforming to Specification A 929/A 929Mshall be used. All pipe furnis
35、hed on the order shall have thesame metallic coating unless otherwise specified.TABLE 1 Pipe SizesNominal Inside Diameter Corrugation SizesARibbed Pipe Minimum OutsideCircumferenceBin. mm112 by14 in.38by6.5mm223 by12 in.68by13mm3by1in.75by25mm5by1in.125 by 25mm34 by34 by 712in.19by19by190mm34 by1by1
36、112 in.19by25by292 mm34 by1by812in.19by25by216 mmin. mm4 100 X 11.4 2646 150 X 17.7 4418 200 X 24.0 59810 250 X 30.2 75512 300 X X 36.5 91215 375 X X 46.0 114818 450 X X X X X 55.4 138321 500 X X X X 64.8 162024 600 X X X X 74.2 185427 675 X X X X 83.6 209130 750 X X X X 93.1 248333 825 X X X X 102.
37、5 256136 900 X X X X X X 111.9 279742 1050 X X X X X X 130.8 326948 1200 X X X X X X 149.6 373954 1350 X X X X X X 168.4 420960 1500 X X X X X X 187.0 467566 1650 X X X X X X 205.7 514272 1800 X X X X X X 224.3 560978 1950 X X X X X X 243.0 607584 2100 X X X X X X 261.7 654290 2250 X X X X X 280.3 7
38、00896 2400 X X X X X 299.0 7475102 2550 X X X X 317.6 7941108 2700 X X X X 336.3 8408114 2850 X X X 355.0 8874120 3000 X X X 373.6 9341126 3150 X X X 392.3 9807132 3300 X X X 410.9 10274138 3450 X X X 429.6 10740144 3600 X X X 448.3 11207AAn “X” indicates standard corrugation sizes for each nominal
39、diameter of pipe.BMeasured in valley of annular corrugations. Not applicable to helically corrugated pipe.TABLE 2 Pipe Arch Requirements 223 by12-in. Corrugations(A 762)Pipe ArchSize, in.EquivalentDiameter,in.Span,Ain.Rise,Ain.Minimum Cor-ner Radius,in.Maximum,B,Bin.17 by 13 15 17 13 3 51421 by 15 1
40、8 21 15 3 624 by 18 21 24 18 3 71428 by 20 24 28 20 3 835 by 24 30 35 24 3 91242 by 29 36 42 29 312 101249 by 33 42 49 33 4 111257 by 38 48 57 38 5 131264 by 43 54 64 43 6 1571 by 47 60 71 47 7 161277 by 52 66 77 52 8 1883 by 57 72 83 57 9 20AA tolerance of 61 in. or 2 % of equivalent diameter, whic
41、hever is greater, ispermissible in span and rise.BB is defined as the vertical dimension from a horizontal line across the widestportion of the arch to the lowest portion of the base.TABLE 3 Pipe Arch Requirements 68 by 13-mm Corrugations(A 762M)Pipe ArchSize, mmEquivalentDiameter,mmSpan,AmmRise,Amm
42、MinimumCornerRadius,mmMaximumB,Bmm430 by 330 375 430 330 75 135530 by 380 450 530 380 75 155610 by 460 525 610 460 75 185710 by 510 600 710 510 75 205780 by 560 675 780 560 75 225885 by 610 750 870 630 75 240970 by 690 825 970 690 75 2551060 by 740 900 1060 740 90 2651240 by 840 1050 1240 840 100 29
43、01440 by 970 1200 1440 970 130 3451620 by 1100 1350 1620 1100 155 3801800 by 1200 1500 1800 1200 180 4201950 by 1320 1650 1950 1320 205 4602100 by 1450 1800 2100 1450 230 510AA tolerance of 25 mm or 2 % of equivalent diameter, whichever is greater, willbe permissible in span and rise.BB is defined a
44、s the vertical dimension from a horizontal line across the widestportion of the arch to the lowest portion of the base.A 762/A 762M 0036.2 Steel Sheet for Coupling BandsThe sheet used infabricating coupling bands shall conform to SpecificationA 742/A 742M with the same polymer coating grade as thatu
45、sed for fabrication of the pipe furnished under the order, andhaving the same metallic coating.6.2.1 As an alternative, the steel sheet used in fabricatingcoupling bands shall conform to Specification A 929/A 929Mwith the same metallic coating as that used for the fabricationof the pipe, with the sh
46、eet having a bituminous coatingaccording to Specification A 849, except the requirement forthe thickness of bituminous coating shall not apply.6.2.2 When specifically permitted by the purchaser, cou-pling bands shall be made of steel sheet conforming toSpecification A 929/A 929M with the same metall
47、ic coating asthat used for the fabrication of the pipe, without bituminouscoating.6.3 RivetsThe rivets used in riveted pipe shall be of thesame material as the base metal specified for the corrugatedsheets. They shall be thoroughly galvanized or sherardized. Ifbolts and nuts are substituted for rive
48、ts (see 7.3.1), they shallmeet the following requirements:Bolts NutsFor A 762 pipeFor A 762M pipeA 449F 568, Class 8.8A 563, Grade CA 563M, Class 12The bolts and nuts shall be hot-dip galvanized in conform-ance with Specification A 153, or be mechanically galvanizedin conformance with Specification
49、B 695, Class 40.6.3.1 When specified in the order, rivets used in riveted pipeto be installed in severely corrosive environments shall bemade of stainless steel conforming to any of the S3xxxxdesignations in Specification A 493. Stainless steel rivets maybe substituted for those described in 6.3 at the fabricatorsoption.NOTE 2Some polymer-precoated pipe in a severe environment isreported to have failed due to corrosion of rivets conforming to 6.3, whilethe sheet was essentially unaffected. The use of st
