FLOOD09724

• County: Statewide
• Basin: Statewide
• Title: Culvert Inspection Manual Supplement to the Bridge Inspectors Training Manual
• Date: 5/1/1986
• Prepared For: Federal Highway Administration
• Prepared By: Office of Engineering
• Floodplain - Doc Type: Educational/Technical/Reference Information

Protective coatings include bituminous coatings, bituminous paving, asbestos
bonded bituminous coatings, polymer, concrete paving, and concrete coatings.
Protective coatings are discussed in more detail in Section 4 of this
chapter. Both round and arch shapes are available in a wide range of standard
sizes. Round pipe is available in standard sizes up to 144 inches in
diameter. Standard sizes for pipe arch are available in sizes up to the
equivalent of a 120-inch diameter round pipe. A listing of sizes available
for each corrugation is provided in the appendix.

b. Structural Plate Steel Pipe--Structura1 plate steel pipes are field
assembled from standard corrugated galvanized steel plates. Standard plates
have corrugations with a 6-inch pitch and a depth of 2 inches. Plates are
manufactured in a variety of thicknesses and are pre-curved for the size and
shape of structure to be erected. Standard plates have a nominal length of
either 10 or 12 feet and are produced in standard widths of 3N, 5N, 6N, 7N,
and 8N, where N equals 3 pi or 9.6 inches. Widths are measured along the
circumference of the structure. Since the circumference of a circle equals pi
times the diameter, the use of dimensions expressed in N or pi permits an easy
conversion from pipe circumference to nominal diameter. For example a 60-inch
diameter round pipe has a circumference of 60 pi or 20N and would normally be
assembled from four 5N plates. Structural plate pipes are available in four
basic shapes; round, pipe arch, arch, and underpass. The standard sizes
available range in span from 5 feet to 26 feet. Tables showing typical sizes
and dimensions are provided in the appendix.

c. Corrugated Steel Box Culverts--Stee1 box sections use standard
corrugated galvanized steel plates with special reinforcing elements applied
to the areas of maximum moment. Steel box culverts are available with spans
that range from 9 feet 8 inches to 20 feet 9 inches. Typical sizes and
dimensions are listed in the appendix.

d. Long Span Corrugated Steel Structures--Long span steel structures are
assembled using conventional 6 by 2 inch corrugated galvanized steel plates
and longitudinal and circumferential stiffening members. There are five
standard shapes for long span structures: horizontal eliptical, pipe arch, low
profile arch, high profile arch, and pear shape. The long span pipe arch is
not commonly used.

The span lengths of typical sections range from 19 feet 4 inches to 40 feet.
Tables illustrating sizes and dimensions of typical sections are provided in
the appendix. Longer spans are available for some shapes as special designs.
It should be noted that each long span installation represents, to a certain
extent, a custom design. The inspector should therefore use design or
as-built plans when cheCking dimensions of existing long span str~ctures.

3-1.5 Corrugated Aluminum.

Corrugated aluminum culverts are constructed from factory assembled corrugated
aluminum pipe or field assembled from structural plates. Structural plate
aluminum culverts are available as conventional structural plate structures,
box culverts, or long span structures.

22