1、Designation: A 762/A 762M 08American 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 () indicates an editorial change since the last revision or reapproval.This standard has been appr
3、oved 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 theco
4、nveyance 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 corr
5、osion 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 can
6、 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 pe
7、rformance 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 un
8、its 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:2A 90/A 90M Test Method for W
9、eight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 153/A 153M Specification for Zinc Coating (Hot-Dip) onIron and Steel HardwareA 307 Specification for Carbon Steel Bolts and Studs, 60000 PSI Tensile StrengthA 449 Specification for Hex Cap Screws, Bolts and Studs,Steel
10、, Heat Treated, 120/105/90 ksi Minimum TensileStrength, General UseA 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA 563 Specification for Carbons and Alloy Steel NutsA 563M Specification for Carbon and Alloy Steel Nuts(Metric)A 742/A 742M Specification for
11、 Steel Sheet, MetallicCoated and Polymer Precoated for Corrugated Steel PipeA 760/A 760M Specification for Corrugated Steel Pipe,Metallic-Coated for Sewers and DrainsA 780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsA 796/A 796M Practice for Structural Design of Co
12、rru-gated Steel Pipe, Pipe-Arches, and Arches for Storm andSanitary Sewers and Other Buried ApplicationsA 798/A 798M Practice for Installing Factory-Made Corru-gated Steel Pipe for Sewers and Other ApplicationsA 849 Specification for Post-Applied Coatings, Pavings,and Linings for Corrugated Steel Se
13、wer and Drainage PipeA 929/A 929M Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel PipeB 633 Specification for Electrodeposited Coatings of Zincon Iron and SteelB 695 Specification for Coatings of Zinc MechanicallyDeposited on Iron and Steel1This specificati
14、on 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 May 1, 2008. Published June 2008. Originallyapproved in 1979. Last previous edition app
15、roved in 2000 as A 762/A 762M 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM Internationa
16、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.C 443 Specification for Joints for Concrete Pipe and Man-holes, Using Rubber GasketsD 1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD 1056 Specification for Flexible
17、Cellular MaterialsSponge or Expanded Rubber,F 568M Specification for Carbon andAlloy Steel ExternallyThreaded Metric Fasteners (Metric)2.2 AASHTO Standard:T 249 Test for Helical Lock Seam Corrugated Pipe33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fabricator, nthe producer
18、 of the pipe.3.1.2 manufacturer, nthe producer of the sheet.3.1.3 minimized 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
19、-MM alloy coating.3.1.4 purchaser, nthe purchaser of the finished product.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
20、-5 Al-MMzinc-5 % aluminum-mischmetal.MMmischmetal.4. Classification4.1 The 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)
21、 or helical corrugations.4.1.2 Type IAThis pipe shall have a full circular 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
22、a single thickness of smooth sheet, fabricated withhelical ribs projecting 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, havin
23、g an approximately flatbottom.4.1.6 Type HRThis pipe shall be a Type IR pipe 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 pe
24、rmit the in-flow or out-flow of water.4.1.8 Type IIIAThis pipe, intended for 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
25、 Al-MM alloy coated material is available in twocoating classes, or structures, 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
26、adequately describe thedesired product.5.1.1 Name of material (polymer-coated 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
27、 of issue, as A 762-_ forinch-pound units or as A 762M_ for SI units,5.1.5 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 Descripti
28、on of corrugations (7.2),5.1.9 Sheet thickness (8.1.2),5.1.10 For Type I and 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 t
29、o pipe with helicalcorrugations. Pipe with annular corrugations must consider 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 Gas
30、kets for coupling bands, if required (9.3),5.1.13 For Type III pipe, class 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 f
31、ormed from polymer precoated sheetconforming to Specification A 742/A 742M.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 e
32、ach side in inch-poundunits, and the thickness in micrometres on each side in SI units.Grade Coating Thicknessin. m10/10 250/250 0.010/0.010 250/2503Available from American Association of State Highway and TransportationOfficials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,http
33、:/www.transportation.org.A 762/A 762M 0826.1.1.1 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-z
34、inc alloy, orzinc-5 % aluminum-mischmetal alloy, 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 Specifica
35、tion A 929/A 929Mshall be used. All pipe furnished 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
36、 by 25mm34 by34 by 712in.19by19by190mm34 by1by1112 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
37、209130 750 X X X X 93.1 248333 825 X X X X 102.5 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
38、X X X X X X 261.7 654290 2250 X X X X X 280.3 700896 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” indicat
39、es standard corrugation sizes for each nominal 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.
40、Maximum,B,Bin.17 by 13 15 17 13 3 51421 by 15 18 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 toleranc
41、e of 61 in. or 2 % of equivalent diameter, whichever 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 Ar
42、chSize, mmEquivalentDiameter,mmSpan,AmmRise,AmmMinimumCornerRadius,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
43、1060 740 90 2651240 by 840 1050 1240 840 100 2901440 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, will
44、be permissible 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.A 762/A 762M 0836.2 Steel Sheet for Coupling BandsThe sheet used infabricating coupling bands shall conform to SpecificationA 742/A 74
45、2M with the same polymer coating grade as thatused 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 u
46、sed for the fabricationof the pipe, with the sheet 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 to
47、Specification A 929/A 929M with the same metallic 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 sherard
48、ized. Ifbolts and nuts are substituted for rivets (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 mechanical
49、ly galvanizedin conformance with Specification 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
