908METAL PIPE

908.01Blank

908.02Corrugated Steel Pipe and Pipe-Arches

Corrugated steel pipe and pipe-arches shall be type I, IA, IR, II, or IIA in accordance with AASHTO M 36.

Corrugated steel pipe, pipe-arches, and co upling bands shall be zinc coated steel or aluminum coated steel in accordance with AASHTO M 36, except as noted herein. 10 They may be fabricated with circumferential corrugations and riveted lap joint construction or with helical corrugations or spiral ribs with continuous lock or welded seam extending from end to end of each length of pipe. Reforming the ends of helical corrugated pipe to form circumferential corrugations will be allowed to enable use of circumferential corrugated coupling bands.

The reforming shall be limited to the length required to accommodate the coupling bands and in such a manner that there is not appreciable slippage of the seam or a plane of weakness created.

Polymer precoated galvanized corrugated steel pipe Type IA and pipe-arch Type IIA have an outer shell of corrugated sheet with helical corrugations and an inner liner 908.01

of smooth sheet attached to the shell with a helical lock seam.

Fittings, including stub-t ee connections and saddle connectors specified in

715.06, shall be shop fabricated. Damage to the coating on fittings shall be repaired in

accordance with AASHTO M 36.

If the pipe or pipe-arch invert is to be paved, it shall first be coated over half its circumference in accordance with 908.07. The paved invert shall then be constructed 30 in accordance with 908.07.

Sheet metal used to fabricate pipe sh all be the same brand from the same manufacturer in any one length of finished pipe.

The manufacturer shall furnish to the fabricator a certified mill report for materials shipped to the fabricator. This certified mill report shall list the kind of base metal, actual test results of the chemical analys is and mechanical te sts of each heat, the thickness, the weight of coating, and shall certify that the material complies with specified requirements for the type of metal furnished. 40

The fabricator shall certify, on furnished forms that:

these Standard Specifications,

used in fabricating the structure were tested and the test results are in accordance with the specified requirements, and

file and available to review for five years.

908.03Blank

908.04Corrugated Aluminum Alloy Pipe and Pipe-Arches

Pipes, pipe-arches, and coupling bands shall be in accordance with AASHTO M 196. The pipe shall be type I, IA, II, or IIA. If the pipe invert is to be paved, it shall be in accordance with 908.07.

The sheet manufacturer’s certified mill report and the fabricator’s certification shall be in accordance with the applicable requirements of 908.02.

Where aluminum alloy pipe culvert is furnished, aluminum alloy end sections shall also be furnished. All component parts shall be aluminum alloy.

908.05Blank

908.05

908.06Metal End Sections

The end section’s metal shall be in accordance with AASHTO M 36 or M 196, 70 whichever is applicable. The sheet metal manufacturer’s certified mill report and the fabricator’s certification shall be in accordance with the applicable requirements of

End sections consisting of multiple panels shall have lap seams tightly jointed with 3/8 in. galvanized rivets or bolts.

All steel pipe end sections shall have a 0.138 in. thick galvanized steel toe plate anchor. The toe plate anchor shall be match punched to fit holes in the skirt lip, and shall be supplied loose, and complete with 3/8 in. diameter galvanized bolts. 80

Straps for pipe end sections shall be e ither galvanized No. 6 reinforcing bars or zinc coated 3/8 in. diameter aircraft cable.

908.07Fully Bituminous Coated Corrugated and Lined Steel Pipe and

Pipe-Arches The material, fabrication, the manuf acturer’s certified mill report, and the fabricator’s certification shall be in accordance with the applicable requirements of

. Coupling bands shall be fully bituminous coated

After fabrication, the pipe or pipe-arch shall be fully bituminous coated.

Connecting or coupling bands shall be of the two-piece type when used with coated pipe of 36 in. diameter or larger.

The asphalt material for coating shall be in accordance with 902.01(e). Samples of the asphalt material will be obtained from the working tank prior to or during coating of the pipe, or from strippings off the pipe after coating. Asphalt materials applied to the pipe shall be free from impurities. The metal shall be free from grease, dust, or moisture. Either process set out below may be used for application. 100

time of immersion shall be 400°F ±5°F. The duration of the immersion in the asphalt shall be in accordance with the following:

Thickness, inches 0.052 0.064 0.079 0.109 0.138 0.168 Minimum Immersion Time for 1st Dip, minutes 2.0 2.5 3.0 5.0 6.5 8.0

300°F and the asphalt shall be heated to a temperature of 380°F ±5°F before the pipe is dipped. 110

908.06

In either process, the pipe shall be dipped a second time or more if necessary, to give a minimum thickness of 0.05 in.

If paved invert is specified, the pipe or pipe-arch shall first be fully coated as required. Additional bituminous material shall be applied in the bottom section to form a smooth pavement. Except where the upper edges intersect the corrugations, the pavement shall have a minimum thickness of 1/8 in. above the crests of the corrugations. The pavement shall be applied to the lower quarter of the circumference.

The manufacturer of the asphalt material shall furnish to the pipe fabricator the type of certification specified in the Frequency Manual and in accordance with 916 for each shipment or lot of asphalt material. The pipe fabricator shall keep these certifications on file and available to review for five years. In addition, samples from the working tank will be obtained for verification of requirements.

908.08Polymer Precoated Galvanized Corrugated Steel Culvert Pipe and

Pipe-Arches The pipe or pipe-arch and coupling bands shall be in accordance with AASHTO M 245 with additions in accordance with 908.02. The polymer precoated galvanized 130 steel sheets shall be in accordance with AASHTO M 246, grade 10/10.

908.09Structural Plate Pi pe, Pipe-Arches, and Arches

Steel structural plate pipe, pipe-arches, and arches shall be constructed from individually galvanized corrugated steel plates as described herein. For pipes and pipe-arches having a thickness less than 0.280 in., the bottom plates shall be of the next greater thickness than that specified for the top and side plates, not including corner plates for pipe-arches. The individual plates shall be in accordance with 140 AASHTO M 167 and AASHTO LRFD Bridge Construction Specifications.

The materials and fabrication shall be as follows:

bottom plates of pipe-arches shall be 18 in. for openings up to and including 131 sq ft and 31 in. for openings over 131 sq ft. The minimum radius of the arc shall be 31 in. for openings from 98 sq ft up to and including 214 sq ft.

with ASTM F3125, grade A 325, or ASTM A449. Nuts shall be heavy hex and in accordance with ASTM A563, grade C3. Washers shall be in accordance with ASTM F436. Assembly bolts, nuts, and washers shall be hot dip galvanized in accordance with ASTM F2329, or be mechanically galvanized in accordance with ASTM B695, Class 55. 908.09

fabricator’s certification shall be furnished in accordance with 160

, except the documents sha ll be in accordance with the

applicable requirements of AASHTO M 167.

Aluminum alloy structural plate pipe, pipe-arches, and arches shall be in accordance with AASHTO M 219. The sheet manufacturer’s certified mill report and the fabricator’s certification shall be furnished in accordance with 908.02.

908.10Cast Iron Soil Pipe

This pipe shall be in accordance with ASTM A74. Markings shall be in 170 accordance with ASTM A74 or ANSI A 40.1.

908.11Steel Pipe

This item shall be electric-fusion, arc-welded steel pipe in accordance with ASTM A139, grade B, or electric-resistance welded pipe in accordance with ASTM A53, Type E, grade B, as applicable. A Type C certification in accordance with 916 shall be provided for the steel pipe.

908.12Straps, Hook Bolts and Nuts Used in Anchors

Straps shall be of the type and size shown on the plans. Reinforcing bars used for 180 straps shall meet the applicable requirements of 910.01 and shall be galvanized in accordance with ASTM A767, class I. Aircraft cable used for straps shall be made of zinc coated steel wire, 3/8 in. nominal diameter, consisting of seven 19-wire flexible steel strands, with a minimum breaking strength of 14,000 lb. The cable shall be in accordance with Military Specification MIL-W-83420D.

Hook bolts and nuts shall be of the size shown on the plans, shall be in accordance with ASTM A307, and shall be galvanized in accordance with ASTM F2329. Threads shall be American Standard Coarse Thread Series Class 2 fit. Threads shall be cleaned after galvanizing to provide a free running fit. Maximum oversizing of the nut threads 190 shall be 1/64 in.

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908.14Slotted Drain or Slotted Vane Drain Pipe

Slotted drains shall be manufactured fr om helically corrugated steel pipe in accordance with AASHTO M 36. At the end of the pipe there shall be two annular corrugations to allow the corrugated band to fully mesh with the pipe.

The grated assembly shall be made of structural steel in accordance with ASTM 200 A36, Grade 36. The assembly shall be suitably welded to the pipe and galvanized after assembly in accordance with AASHTO M 111. The grate shall be of the size and spacing shown on the plans and shall be welded on both sides to each bearing bar with a 3/16 in. fillet weld. 908.10

The size and thickness of the corrugated steel slotted drain pipe shall be as shown on the plans.

Slotted vane drain pipe shall be smoo th wall PVC in accordance with 907.23, and shall be of the diameter specified. The casti ng shall be in accordance with 910.05(b). 210 The finish shall be standard black asphalt emulsion. Individual units shall have a minimum weight of 155 lb.