Putting adjustable risers to the test

摘要

The City of St. Louis Water Division first tested the American Highway Products Pivoted Turnbuckle Manhole Riser in 1996. Agreeing to that test was a major change in policy-the division had given up on the use of risers after cast-iron products had proven to be ineffective and unsafe. "We could never get them to seat well," division superintendent Vince Foggie explained, referring to the non-adjustable cast-iron risers. "They'd rattle and even pop out at times, leaving the traffic and the public exposed to an open manhole-it was dangerous."