ENGINEERED SOLUTIONS Aluminum Structural Plate

Aluminum Structural Plate Time-Tested & Durable Engineers, officials and contractors know that proper construction materials play an important part in designing efficient, economical drainage structures. This is why corrugated metal pipe has gained wide acceptance during more than 80 years of use in drainage structures under highways, railroads, airports and city streets. Corrugated metal pipe offers definite advantages over other materials because of its lightweight, durability, ease of installation, low maintenance and adaptability to various field conditions. Logically, engineers wanted these...

Durability Abrasion Resistant Aluminum’s abrasion resistance has been proven through years of exposure to wet/dry abrasion-corrosion cycles. In normally abrasive runoffs, aluminum will only peen with minimum metal loss. The Aluminum Association presented a paper to the Transportation Research Board in January 1969, reporting on more than 1,000 aluminum culverts*. (An updated report was presented in 1986**.) This aluminum structural plate pipe has handled tidal ocean waters under U.S. Highway 1 at the Bay of Fundy in Maine since 1966. Both reports included a method of predicting abrasion performance...

Handling & Design Lightweight Boxed Culverts Lightweight is one of the main advantages of aluminum drainage structures. Aluminum structural plate weighs approximately 1/50 as much as reinforced concrete pipe in an equivalent size. This weight factor reduces assembly and equipment costs, helps gain access to remote sites and allows handling of long preassembled structures with relative ease. A ribbed, corrugated aluminum box culvert structure is a specially designed aluminum structural plate product that has a wide span and a low rise needed for a low headroom, low cover installation. Reduced...

End Treatment End Treatment Proper end treatments perform both structural and hydraulic functions. Standard end finishes available on aluminum structural plate are square ends, step bevels, skews, partial bevels, and skew bevels. Uncut or square-end structures are the lowest in cost and are readily adaptable to road widening projects. When skewed to the roadway embankment, larger structures may require properly warped and balanced backfill to provide uniform soil loading and support perpendicular to the structure’s center line. For hydraulic structures, special attention should be given to proper...

Plate Data Description Aluminum structural plate’s corrugation pattern has a 9” pitch and a 2 ½” depth. The corrugations are at right angles to the length of the structure. Thickness – Nominal plate thicknesses are available from 0.125” to 0.250” (See Table 12). Lengths – Individual circumferential plate lengths are noted in terms of N (N = 9.625” or 9 5/8” or 3 pi). Standard plates are fabricated in seven net covering lengths: • 8N (77.00”), 9N (86.63”) • 10N (96.25”), 11N (105.88”) • 12N (115.50”(, 13N (125.13”) and 14N (134.75”) The N nomenclature translates circumference directly into nominal...

Round and Vertical & Horizontal Ellipse Notes 1. N = 9.625” 2. Dimensions are to inside corrugation crests and are subject to manufacturing tolerances. 3. To determine the proper gage, use information on table 7. 4. Reinforcing rib length, if required. For 66” through 96” diameter, use Type II rib only. 5. Areas as shown are for round pipe. Areas for vertical ellipses are slightly less. This front end loader easily handles this 50’ section of round pipe. Notes 1. N = 9.625” 2. Dimensions are to inside corrugation crests and are subject to manufacturing tolerances. 3. Reinforcing rib length, if...

Pipe Arch Notes 1. N = 9.625” 2. Dimensions are to inside corrugation crests and are subject to manufacturing tolerances. 3. To determine the proper gage, use information on table 10. 4. The Arc Length N column reflects the peripheral length of a certain radius. Actual plate make-up, in a ring for a pipearch structure, will vary because of the multiple radii in a single plate. 5. Haunch Radius (Rh) = 37.75” 6. Reinforcing rib length, if required. For 6’7” through 7’3” span, use Type II rib only. 7. See side fill and foundation d

Notes 1. N = 9.625” 2. Dimensions are to inside corrugation crests and are subject to manufacturing tolerances. The designer should allow sufficient clearance for manufacturing tolerances and installation deflection. 3. To determine proper gage, use information on table 11. 4. The Arc Length N or inches column reflects the peripheral length of a certain radius. Actual plate make-up, in a ring for an under pass structure, will vary because of multiple radii in a single plate. 5. The bottoms of pedestrian/animal underpasses are nearly flat. 6. Reinforcing rib length, if required. Only Type II crown...

Notes 1. N = 9.625” 2. Dimensions to inside corrugation crests are subject to manufacturing tolerances. 3. To determine proper gage, use information on table 8. 4. Reinforcing rib length, if required. For 5’ through 8’ span, use Type II rib only. 5. The aluminum receiving angle is a separate item. 6. Arch shapes shown in a single radius with a rise/span ratio of 0.30 or greater. Structure with rise/span ratios less than 0.30 are not typically used due to structural considerations. 90° Aluminum Receiving Angle (5) Notes Maintain enough clearance between the rebar and aluminum to avoid galvanic...

Offering Superior Corrosion Resistance and Many Decades of Maintenance-Free Service Life.

Aluminum structural plate structures offer superior corrosion resistance and many decades of maintenance-free service life. 90° Aluminum Receiving Angle (5)

Notes 1. The tables are presented for the designer’s convenience in selecting metal thickness, reinforcing rib type and rib spacing for minimum cover applications. For structures with maximum covers greater than those shown in the table, heavier plate may possibly be used. Consult your Contech representative. 2. Allowable cover (minimum and maximum) is measured from the outside valley of the crown plate to the top of rigid pavement. Minimum cover is measured at the lowest fill area subjected to possible wheel loads (typically at the roadway shoulder). Minimum cover must be maintained in unpaved...