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Right: A pivoted turnbuckle manhole riser is installed with a screwdriver, which acts as a lever enabling the turnbuckle to transmit thousands of pounds of force to the flexible rim.
Below: A completed pivoted turnbuckle manhole riser installation.
BEFORE
AFTER
BIG GAINS,
NO SETBACKS
Milwaukee Makes Adjustable Manhole Risers the New Standard
When infrastructure fails, it’ s often in the details. In Milwaukee, city engineers identified a recurring issue with conventional cast iron manhole risers— occasional slippage or dislodgment that resulted in vehicle damage and citizen claims.“ They typically worked fine,” recalls Samir Amin, P. E., the city’ s Engineer in Charge.“ But when they didn’ t, the consequences were costly. We knew there was room for improvement.” That improvement came by way of a demonstration from American Highway Products, showcasing their Pivoted Turnbuckle Manhole Riser. Made from rugged galvanized steel and custom-sized to each application, the riser features a unique turnbuckle design. When tightened using a simple screwdriver as a lever, it applies thousands of pounds of force to a flexible rim, locking the riser securely into place within the existing utility frame. The result is a fast, stable installation— usually completed in under five minutes— with no need for set screws or complex adjustments. Unlike traditional risers, which only secure at specific points, the turnbuckle mechanism grips evenly around the entire circumference.“ It acts more like a press-fit bearing,” says Amin,“ providing consistent pressure and eliminating movement.”
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