COVER STORY | ADVERTORIAL
Pivoted Turnbuckle Manhole Riser Installation
“ We ’ ve been installing at least a hundred annually for at least 15 years ,” Perrin says . “ And I ’ ve never seen one fail , not even from rust . ... Usually , customers don ’ t even know we install these risers . It ’ s something we do on our own so that our paving projects look better and last longer .”
Manhole Risers Too
Perrin liked the results so much that the company immediately decided to try out another utility riser solution from AHP , the Pivoted Turnbuckle Manhole Riser .
This is an adjustable steel riser ; the ‘ pivoted turnbuckle ’ is set into the flexible rim , which enables onsite adjustment . This makes manhole grade adjustment a fast , convenient process . Many contractors set the AHP risers immediately before paving . The new riser is set into the original manhole rim , and crews use a Phillips-head screwdriver ( as a cranking lever ) to quickly expand the riser . This mechanical process exerts thousands of pounds of force , seating the riser tightly and securely , even in worn rims . “ Being able to tighten the rims makes a big difference — I like how they ‘ hold on ’ to the original unit ,” Perrin says . “ Some of the cast iron risers will just sit loosely on the rim ’ s bottom ledge and flop around .” In Perrin Asphalt ’ s workflow , a two-man crew works just ahead of the paver and sets all the risers . “ The whole process takes about 10 minutes ,” Perrin says . And they ’ re cost effective . “ We still raise manholes with grade rings , because some cities insist on it ,” Perrin says . “ We can only do about four a day when we do it that way , and the costs work out to about $ 500 more per riser . I
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