1、Standard Specification for Corrugated Steel Pipe, Polymer-Precoated, for Sewers and Drains AASHTO Designation: M 245-16 Release: Group 2 (June 2016) ASTM Designation: A762/A762M-98 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington,
2、 D.C. 20001 TS-4b M 245-1 AASHTO Standard Specification for Corrugated Steel Pipe, Polymer- Precoated, for Sewers and Drains AASHTO Designation: M 245-16 Release: Group 2 (June 2016) ASTM Designation: A762/A762M-98 1. SCOPE 1.1. This specification covers polymer-precoated corrugated steel pipe inten
3、ded for use for storm water drainage, underdrains, the construction of culverts, and similar uses. Pipe covered by this specification is not normally used for the conveyance of sanitary or industrial wastes. The steel sheet used in fabrication of the pipe has a polymer protective coating over a meta
4、llic coating of zinc (galvanizing), 55 aluminum-zinc alloy, or zinc-5 percent aluminum-mischmetal alloy. 1.2. The polymer coating provides a degree of extra protection for the pipe against abrasion and corrosion as compared with metallic-coated pipe without polymer coating. Some severe environments
5、may cause corrosion problems to accessory items such as rivets or coupling band hardware that does not have a polymer coating. Additional protection for polymer-precoated corrugated steel pipe can be provided by use of coatings applied after fabrication of the pipe as described in M 190. 1.3. This s
6、pecification does not include requirements for bedding, backfill, or the relationship between earth cover load and sheet thickness of the pipe. Experience has shown that the successful performance of this product depends upon the proper selection of sheet thickness, type of bedding and backfill, con
7、trolled manufacture in the plant, and care in the installation. The installation procedure is described in the AASHTO LRFD Bridge Construction Specifications, Section 26. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 190, Bituminous-Coated Corrugated Metal Culvert Pipe and Pipe-Arches M 218, Stee
8、l Sheet, Zinc-Coated (Galvanized), for Corrugated Steel Pipe M 232M/M 232, Zinc Coating (Hot-Dip) on Iron and Steel Hardware M 243, Field-Applied Coating of Corrugated Metal Structural Plate for Pipe, Pipe-Arches, and Arches M 246, Steel Sheet, Metallic-Coated and Polymer-Precoated, for Corrugated S
9、teel Pipe M 289, Aluminum-Zinc Alloy Coated Sheet Steel for Corrugated Steel Pipe T 65M/T 65, Mass Weight of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings T 249, Helical Lock Seam Corrugated Pipe AASHTO LRFD Bridge Construction Specifications AASHTO LRFD Bridge Design Specifica
10、tions 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 245-2 AASHTO 2.2. ASTM Standards: A493, Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging A563
11、M, Standard Specification for Carbon and Alloy Steel Nuts (Metric) A780/A780M, Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings A796/A796M, Standard Practice for Structural Design of Corrugated Steel Pipe, Pipe-Arches, and Arches for Storm and Sanitary Sewers
12、 and Other Buried Applications A929/A929M, Standard Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe B633, Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel B695, Standard Specification for Coatings of Zinc Mechanically Depo
13、sited on Iron and Steel C990, Standard Specification for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants D1005, Standard Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers D1056, Standard Specification for Flex
14、ible Cellular MaterialsSponge or Expanded Rubber F568M, Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners (withdrawn 2012) 2.3. AISI Standard: S100, North American Specification for the Design of Cold-Formed Steel Structural Members 3. TERMINOLOGY 3.1. Descriptio
15、n of Terms Specific to This Standard: 3.1.1. fabricatorthe producer of the pipe. 3.1.2. manufacturerthe producer of the sheet. 3.1.3. purchaserthe purchaser of the finished product. 4. CLASSIFICATION 4.1. The corrugated steel pipe covered by this specification is classified as follows: 4.1.1. Type I
16、This pipe shall have a full circular cross section, with a single thickness of corrugated sheet, fabricated with annular (circumferential) or helical corrugations. 4.1.2. Type IAThis pipe shall have a full circular cross section with an outer shell of corrugated sheet fabricated with helical corruga
17、tions and an inner liner of smooth (uncorrugated) sheet attached to the shell at helical lock seams. 4.1.3. Type IRThis pipe shall have a full circular cross section with a single thickness of smooth sheet, fabricated with helical ribs projecting outwardly. 4.1.4. Type IIThis pipe shall be a Type I
18、pipe that has been reformed into a pipe-arch having an approximately flat bottom. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 245-3 AASHTO 4.1.5. Type IIAThis pipe shall be a Type IA pipe th
19、at has been reformed into a pipe-arch having an approximately flat bottom. 4.1.6. Type IIRThis pipe shall be a Type IR pipe that has been reformed into a pipe-arch having an approximately flat bottom. 4.1.7. Type IIIThis pipe, intended for use as underdrains or for underground disposal of water, sha
20、ll be a Type I pipe that has been perforated to permit the inflow or outflow 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
21、included in two classes as described in Section 8.3.2. 5. ORDERING INFORMATION 5.1. Orders for material to this specification shall include the following information as necessary to adequately describe the desired product: 5.1.1. Name of material (polymer-coated corrugated steel pipe); 5.1.2. Grade
22、of polymer coating indicating thickness on inside and outside (Section 6.1.1); 5.1.3. Type of metallic coating (zinc or aluminum-zinc alloy) (Section 6.1.2); 5.1.4. AASHTO designation and date of issue; 5.1.5. Type of pipe (Section 4.1); 5.1.6. Diameter of circular pipe (Table 8), or span and rise o
23、f pipe-arch section (Tables 10, 11, or 12); 5.1.7. Length, either total length or length of each piece and number of pieces; 5.1.8. Description of corrugations (Section 7.2); 5.1.9. Sheet thickness (Section 8.1.2); 5.1.10. For Type I and Type II pipe, the pipe fabrication method, whether with annula
24、r corrugations or helical corrugations (Section 7.1.1) (Note 1); 5.1.11. Coupling bands, number, and type (Section 9.1) if special type is required; 5.1.12. Gaskets for coupling bands, if required (Section 9.3); 5.1.13. For Type III pipe, class of perforations, if other than Class 1 (Section 8.3.2);
25、 5.1.14. Certification, if required (Section 14.1); and 5.1.15. Special requirements. Note 1Pipe manufactured with annular corrugations may have an element of weakness in the longitudinal seams compared with pipe with helical corrugations. Therefore, consideration of the method of fabrication is imp
26、ortant when pipe is installed under certain conditions of loading. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 245-4 AASHTO 6. MATERIALS 6.1. Steel Sheet for PipeAll pipe fabricated under th
27、is specification shall be formed from polymer-precoated sheet conforming to M 246. 6.1.1. The grade of coating shall be stated in the order, and the polymer coating thickness on both inside and outside of the pipe. The polymer coating is classified by grade corresponding to the thickness in micromet
28、ers on each side in SI units (see Table 1). Table 1Grade Grade Coating Thickness, m 250/250 250/250 6.1.1.1. Any combination of polymer coating thickness or other than shown in Table 1 is subject to agreement between the manufacturer and purchaser or fabricator. 6.1.2. The polymer coating is applied
29、 to steel sheet having a metallic coating of zinc or aluminum-zinc alloy, as described in M 218, M 289, or ASTM A929/A929M. The type of metallic coating should be stated in the order, consistent with thickness availability as shown in Table 9. If the type of metallic coating is not stated, zinc-coat
30、ed sheet conforming to M 218 shall be used. All pipe furnished on the order shall have the same metallic coating unless otherwise specified. 6.2. Steel Sheet for Coupling BandsThe sheet used in fabricating coupling bands shall conform to M 246 with the same polymer coating grade as that used for fab
31、rication of the pipe furnished under the order, and having the same metallic coating. 6.2.1. As an alternate, the steel sheet for coupling bands shall conform to M 218, M 289, or ASTM A929/A929M (with the same metallic coating as the pipe), with the sheet having a bituminous coating according to M 1
32、90, except the thickness requirement shall not apply. 6.2.2. When specifically permitted by the purchaser, coupling bands shall be made of steel sheet conforming to the specification listed in Section 6.2.1 having the same metallic coating as the pipe, but without bituminous coating. 6.3. RivetsThe
33、rivets used in riveted pipe shall be of the same material as the base metal specified for the corrugated sheets. They shall be thoroughly galvanized or sherardized. If bolts and nuts are substituted for rivets (Section 7.3.1), they shall meet the following requirements (see Table 2). Table 2Bolts an
34、d Nuts Bolts Nuts For pipe fabrication: For M 245 pipe F568M, A563M, Class 8.8 Class 12 For coupling bands: For M 245 pipe F568M, A563M, Class 4.6 Class 5 The bolts and nuts shall be hot-dip galvanized in conformance with M 232M/M 232, or be mechanically galvanized in conformance with ASTM B695, Cla
35、ss 40. 6.3.1. When specified in the order, rivets used in riveted pipe to be installed in severely corrosive environments shall be made of stainless steel conforming to any of the S3xxxx designations in 2016 by the American Association of State Highway and Transportation Officials. All rights reserv
36、ed. Duplication is a violation of applicable law.TS-4b M 245-5 AASHTO ASTM A493. Stainless steel rivets may be substituted for those described in Section 6.3 at the fabricators option. Note 2Some polymer-precoated pipe in a severe environment is reported to have failed due to corrosion of rivets con
37、forming to Section 6.3, while the sheet was essentially unaffected. The use of stainless steel rivets is recommended to overcome such problems. 6.4. Hardware for Coupling BandsBolts and nuts for coupling bands shall conform to the following requirements (see Table 2). Bolts, nuts, and other threaded
38、 items used with coupling bands shall be zinc coated by one of the following processes: hot-dip process as provided in M 232M/M 232; electroplating process as provided in ASTM B633, Class Fe/Zn 8; or mechanical process as provided in ASTM B695, Class 8. Other hardware items used with coupling bands
39、shall be zinc coated by one of the following processes: hot-dip process as provided in M 232M/M 232; electroplating process as provided in ASTM B633, Class Fe/Zn 25; or mechanical process as provided in ASTM B695, Class 25. 6.5. GasketsIf gaskets are used in couplings, they shall be a band of expand
40、ed rubber meeting the requirements of ASTM D1056 for the “RE” closed cell grades, or O-rings meeting the requirements of ASTM C990. 7. FABRICATION 7.1. General RequirementsPipe shall be fabricated in full circular cross section except for Type IIIA, which is described in Section 8.4. 7.1.1. Type I p
41、ipe shall have annular corrugations with lap joints fastened with rivets or shall have helical corrugations with a continuous lock seam extending from end to end of each length of pipe. The type of fabrication used shall be the option of the fabricator unless otherwise specified. 7.1.2. Type IA pipe
42、 shall be fabricated with a smooth liner and helically corrugated shell integrally attached at helical lock seams extending from end to end of each length of pipe. The shell shall have corrugations of nominal 68- or 75-mm pitch. 7.1.3. Type IR pipe shall be fabricated with helical ribs projecting ou
43、tward with a continuous lock seam extending from end to end of each length of pipe. 7.2. CorrugationsThe corrugations shall be either annular or helical as provided in Section 7.1. The direction of the crests and valleys of helical corrugations shall not be less than 60 degrees from the axis of the
44、pipe for pipe diameters larger than 500 mm and not less than 45 degrees from the axis for pipe diameters of 500 mm and smaller. 7.2.1. For Type I and IA pipe, corrugations shall form smooth continuous curves and tangents. The dimensions of the corrugations shall be in accordance with Table 3 for the
45、 size indicated in the order, except if the depth measurement of one or more corrugations is less than the minimum depth in Table 3, the depth of all corrugations between adjacent seams shall be measured and the values of Table 4 for minimum average depth and minimum corrugation depth shall apply. N
46、ote 3Inspection frequently consists of measurement of the depth of one or a few corrugations. If such measurement indicates insufficient depth, application of the requirements in Table 4 provides for acceptance where greater depth of some corrugations compensates for lack of depth of others. These m
47、easurements would normally be made at one location between seams on a length of pipe. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 245-6 AASHTO Table 3Corrugation Requirements for Types I, IA
48、, II, IIA, and III Pip e Inside RauscNominal Size, mm Max Pitch,amm Min Depth,bmm Nominal, mm Min, mm 38 by 6.5d48 6 7 6.5 68 by 13 73 12 17 12 75 by 25 83 24 14 12 125 by 25 135 24 40 36 aPitch is measured from crest to crest of corrugations, at 90 degrees to the direction of the corrugations. bDep
49、th is measured as the vertical distance from a straightedge resting on the corrugation crests parallel to the axis of the pipe to the bottom of the intervening valley. If the depth measurement of one or more corrugations is less than the value indicated herein, the depth of all corrugations between seams shall be measured, and the requirements of Table 2 shall be applied (see Section 7.2.1). cMinimum inside radius requirement does not apply to a corrugation containing a helical lock seam. dThe corrugation siz
