introduction 1200 mm Diameter Manhole Material Manhole material in the City of Edmonton and other Northern Alberta jurisdictions are typically 1200 mm in diameter, with access to the manhole provided through a 635 mm diameter opening, with steps provided along the wall of the structure. 1200 mm to 635 mm conical tops are used in the City of Edmonton and surrounding area as an alternative to standard 1200 mm Slab Tops with 635 mm openings. The conical top is 1.0 m in height and is used on manholes, when depth permits, as a more efficient method to distribute the live loading forces from traffic above ground. Standard grade rings may be used on top of the conical section to adjust the height of the manhole to reach the surface, just as would be done with a standard slab top. Prebenched manhole material, described on the following page, is made to order according to custom hole sizes and locations, whereas the standard material listed on this page (commonly referred to as “flat base and barrels”) allows for a “grab and go” alternative. Coring and benching of this material is performed by the contractor in the field. concrete pipe stormwater treatment technologies Product Description 1200 mm dia. Base 1200 dia. x 1220 mm Barrel 1200 dia. x 810 mm Barrel 1200 dia. x 410 mm Barrel 1200 dia. x 300 mm Barrel 1200 dia. to 635 dia. x 1000 mm Cone Top 1200 mm dia. Top Slab 1200 mm dia. Slab Top with 910 mm dia. Opening 1200 mm dia. K-7 or DK-7 Top 1200 mm dia. Spigot to Spigot Transition Barrel 150 mm Grade Ring with 635 mm dia. Opening 100 mm Grade Ring with 635 mm dia. Opening 75 mm Grade Ring with 635 mm dia. Opening 50 mm Grade Ring with 635 mm dia. Opening 150 mm Grade Ring with 910 mm dia. Opening 100 mm Grade Ring with 910 mm dia. Opening 75 mm Grade Ring with 910 mm dia. Opening 50 mm Grade Ring with 910 mm dia. Opening Product Weight (kg) 730 1580 1049 530 380 1370 580 480 590 360 120 80 60 box sections manhole and catch basin material 40 220 180 140 100 LAFARGE PIPE eMANUAL PAGE 15