5-Attachment A FDOT Section 945.pdf
PDF 864 KB Posted
- Attached to
- Metal Culvert Pipe
- Solicitation number
- ITB-26-00071
- Issued by
- Hillsborough County, Florida
About this file
This is a technical specification document from the Florida Department of Transportation (FDOT) Section 945, establishing standards for aluminum pipe, underdrain, pipe arch, and structural plate pipe and pipe arch materials for the Hillsborough County Board of County Commissioners' metal culvert pipe procurement project with an estimated budget of $1,190,000.00. The specification requires aluminum-alloy culvert pipe and underdrains to comply with AASHTO M196 standards, with corrugated aluminum pipe fabricated using helical corrugations and minimum annular corrugations at pipe ends. Manufacturers must provide shipping tickets documenting actual mean inside diameter and total measured lengths for each pipe lot, conduct hydrostatic joint testing at the manufacturing plant witnessed by the Engineer, and submit certified mill analyses prior to installation confirming material compliance with specified alloy requirements.
The specifications establish metal thickness requirements for sidedrain pipe based on nominal diameter, ranging from 18-gauge (0.048 inches) for 6-inch diameter pipe to 8-gauge (0.164 inches) for 72-inch and larger diameter pipe. For structural plate pipe, pipe arch, and arches, materials must conform to AASHTO M219 with bolts and nuts meeting either aluminum alloy standards (ASTM B211 Alloy 6061) or steel standards (ASTM A307 or A325 with hot double-dipped galvanizing). Pipe markings may be ink-stamped rather than coined, with a quality control label applied to interior walls identifying the fabricator, corrugating date, and inspection date. Bituminous coated aluminum pipe must meet corrugated steel pipe coating requirements, and Class IV pipe is prohibited from use.
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Text version
SECTION 945
ALUMINUM PIPE, INCLUDING UNDERDRAIN, PIPE
ARCH AND STRUCTURAL PLATE PIPE AND PIPE ARCH
945-1 General Requirements.
Aluminum-alloy culvert pipe and underdrains shall meet the requirements of AASHTO M196 and the additional provisions contained herein. Except for underdrain, corrugated aluminum pipe including pipe arch shall be fabricated with helical corrugations with a minimum of two annular corrugations formed into each end of each pipe to accommodate a coupling band. Annular fabrication is not permitted unless specifically called for in the Plans or specifications. Provide, as part of the shipping ticket, the actual mean inside diameter and total measured lengths of each lot of pipe shipped to the project. Include the minimum and maximum inside diameters used to calculate the actual mean inside diameter.
Test the pipe joints hydrostatically at the specified pressure using test methods in ASTM D3212 with the exceptions of Sections 7.3 and 7.4. In lieu of Section 7.4, deflect one side of the pipe to a 5% reduction in internal diameter using the parallel plate testing methodology of ASTM D2412. Load the deflected pipe to within 1/2 the actual pipe diameter from the centerline of the gasket or just beyond the end of the hugger band, whichever is greater. Ensure that the loading mechanism does not contact the hugger band or associated hardware. Testing of pipe joints shall be done at the manufacturing plant and witnessed by the Engineer or designated representative.
For sidedrains, unless shown otherwise in the Plans the minimum thickness of the metal shall be as specified below. Alternatively, if no future maintenance concerns exist, the Contractor may propose the pipe gage based on the Department’s Drainage Manual and Culvert Service Life Estimator for approval by the Engineer.
NON SI UNITS
TABLE I THICKNESS OF METAL FOR SIDEDRAIN PIPE
Nominal Diameter or Equivalent (inches)
Sheet Gauge No.
Mean Thickness of Metal
(inches) 6 18 0.048 8 16 0.060 10 16 0.060 12 16 0.060 15 16 0.060 18 16 0.060 21 16 0.060 24 16 0.060 30 14 0.075 36 14 0.075 42 12 0.105 48 12 0.105 54 12 0.105
60 10 0.135 66 10 0.135
72 and over 8 0.164
Where bituminous coated aluminum pipe is specified the bituminous coating shall meet the requirements as specified for corrugated steel pipe in 943-5. Bituminous coated and paved aluminum pipe shall meet the additional requirements specified in 943-6 and 943-7, as applicable.
Class IV pipe shall not be used.
945-2 Aluminum Alloy Structural Plate Pipe, Pipe Arch and Arches.
945-2.1 General Requirements: Aluminum alloy structural plate pipe, pipe arch, and arches shall conform to AASHTO M219, with the exceptions and additions specified herein. The nominal thickness of the plate shall be as shown in the Plans.
945-2.2 Bolts and Nuts: In lieu of shaped bolts and nuts, standard type bolts and nuts, with special shaped washers, may be used. For aluminum bolts and nuts the material shall conform to the chemical requirements shown in Table I of ASTM B211, for Alloy 6061. Nuts shall be lubricated at the factory, with a suitable wax compound. The bolts may be sampled and tested before erection or may be accepted on the basis of the manufacturer’s certification.
For steel bolts and nuts, the material shall meet the requirements of either ASTM A307 or ASTM A325, as appropriate, and shall be hot double-dipped galvanized.
Aluminized steel bolts, or other equally suitable devices for connecting the plates, may be used if approved by the Engineer.
945-2.3 Certification of Tests: Submit to the Engineer, prior to installation, a certified mill analysis and certification verifying that the aluminum parts and components are of the alloys specified and comply with the requirements of this Section.
945-2.4 Direct Purchases by the Department: The provisions of 944-9 shall also apply to Departmental purchases of aluminum alloy structural plate pipe, pipe arches and arches.
945-2.5 Pipe Markings: In lieu of the coined markings required by AASHTO M196, Section 14, information may be ink stamped on the pipe at the time of manufacture. A QC label with the pipe fabricator’s identity, the date of corrugating or forming into pipe, and the date of final QC inspection shall be applied to the inside walls of pipe using indelible ink. The pipe markings must be clearly legible upon arrival at the jobsite and at the time of installation. Pipe with illegible or incomplete markings may be rejected.
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