Product Description

Structural plate pipes are structures where corrugated steel sections are bolted together to form the required shape. The corrugated sections are commonly referred to as plates. The 6 x 2 inch corrugations shown in Figure 2.1 is the standard. Structural plate structures are specified where the pipe required exceeds the size that can be shipped to the job site, or where earth cover is so great that the wall thickness furnished by a shop-manufactured pipe will not meet design requirements. 

The corrugations are formed at right angles to the length of the bridge or culvert. The length of a plate is measured in a direction parallel to the length of the structure. The width of a plate is, therefore, measured in a direction perpendicular to the length of the structure, around the periphery of the structure. See Figures 2.4 and 2.5.

Standard plates are fabricated in three lengths and several different widths. The plate width designation, N, is used to describe the various plate widths available. N is the spacing between two circumferential bolts, or one circumferential bolt hole space (circumferential refers to the direction around the periphery of the structure, at right angles to the length of the structure). For instance, a 5N plate has a net width of 5 circumferential bolt hole spaces and an 8N plate has a net width of 8 circumferential bolt hole spaces. The bolt hole space, N is 9.6 inches ( see Table 2.25). Note that not all widths are available in all lengths. Plates are furnished curved to various radii and are clearly identified by the fabricator for field assembly. The fabricator provides assembly drawings to quid the installer. The plates are available in thicknesses from 0.222 inches to 0.380 inches See Table 2.13 for sectional properties. Weights of individual plate sections are shown in Table 2. 26. Approximate weights of structural plate structures are readily calculated using these values.

Section Properties

Section properties, used for design, are proved in Table 2. 13. As with corrugated steel pipe corrugations, properties of the arc-and-tangent structural plate corrugation are derived mathematically using the design thickness. The properties in the tables include area, moment of inertia, section modulus and radius of gyration.

Sizes and Shapes

The plates are assembled into various shapes as indicated in Tables 2.27 though 2.36. THe shapes include round, pipe arch, singles-radius arch, horizontal ellipse, low profile arch, high profile arch, pear, underpass and vertical ellipse, Special shapes, and other sizes of standard shapes beyond what is shown in the tables, are also available, The fabricator provides detailed assembly instructions with each structure.

Click Here to Find a Member Supplier